CN212358590U - Steel tenon key for improving assembling shear strength of precast beam segments - Google Patents
Steel tenon key for improving assembling shear strength of precast beam segments Download PDFInfo
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- CN212358590U CN212358590U CN202020876505.5U CN202020876505U CN212358590U CN 212358590 U CN212358590 U CN 212358590U CN 202020876505 U CN202020876505 U CN 202020876505U CN 212358590 U CN212358590 U CN 212358590U
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Abstract
The utility model discloses a steel tenon key for improving the splicing shear strength of precast beam segments, which comprises a tenon component and a mortise component which are matched, wherein the tenon component and the mortise component are respectively arranged at the opposite ends of a first segment and a second segment; the tenon assembly comprises a first embedded section embedded in the first section and a tenon protruding out of the end face of the first section; the tenon hole assembly comprises a second embedded section embedded in the second section and a tenon hole formed in the end part of the second embedded section; the axial both ends of first pre-buried section and second pre-buried section are the cuboid structure. The utility model discloses an improve shear strength's steel tenon key is assembled to precast beam segment, the plane through the cuboid transmits the bearing capacity, and stress concentration is regional little between steel tenon key and the concrete, and shear strength is high.
Description
Technical Field
The utility model relates to a shear key that precast beam segment was assembled especially relates to an improve shear strength's steel tenon key is assembled to precast beam segment.
Background
Currently, in precast beam segment erection, two forms are generally adopted to improve shear strength: firstly, opposite segment end surfaces are spliced by adopting a toothed concrete structure, wherein the form of the toothed concrete structure comprises a rectangle, a trapezoid, a triangle and the like, a joint of the toothed structure can play a role in shearing resistance, the strength of the joint is improved, but a tooth key joint needs to be prefabricated by adopting a close-fitting pouring method, a complex tooth key model needs to be installed, the process is complex, and meanwhile, the positioning precision of a concrete tooth key is low; secondly, the tenon key is pre-embedded in the beam end bearing area, the cross section of the existing tenon key is of a circular structure, under the condition that the beam end is stressed, the acting force of the tenon key on concrete generates component forces in the vertical direction and the horizontal direction, the component forces in the horizontal direction generate horizontal tensile stress on the concrete bearing area below the tenon key, and the tensile strength of the concrete axis is about 1/10 of the compressive strength of the axis, so that the beam end concrete is easily damaged, and the problem of concentrated contact stress exists between the cylindrical tenon key and the concrete.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides an improve shear strength's steel tenon key is assembled to precast beam festival section aims at solving current precast beam festival section concrete and bears horizontal direction effort fragile concrete structure, the festival section is assembled shear strength and is hanged down, the tenon key and concrete between stress concentration area great, the loaded down with trivial details scheduling problem of preparation technology.
The utility model discloses take following technical scheme to realize above-mentioned purpose:
a steel tenon key for improving the assembling shear strength of a precast beam segment, wherein the precast beam at least comprises a first segment and a second segment; the steel tenon key is characterized by comprising a tenon component and a mortise component which are matched, wherein the tenon component and the mortise component are respectively arranged at the opposite ends of the first section and the second section; the tenon assembly comprises a first embedded section embedded in the first section and a tenon protruding out of the end face of the first section, and the first embedded section and the tenon are coaxial and are integrally formed; the mortise assembly comprises a second embedded section embedded in the second section and a mortise arranged at the end part of the second embedded section, the mortise is coaxial with the second embedded section and is inserted into the tenon, and the tenon is in clearance fit with the mortise; the axial both ends of first pre-buried section and second pre-buried section are the cuboid structure.
According to the technical scheme, two axial ends of the first embedded section and the second embedded section are made into cuboid structures, the bearing capacity of the first section and the bearing capacity of the second section are transmitted to concrete through the side faces of the cuboid in the vertical direction, the concrete only bears the pressure in the vertical direction, the beam end concrete structure is not prone to damage, the bearing capacity is transmitted through a plane, the stress concentration area between the steel tenon key and the concrete is small, and the shearing strength is high; in the cylindrical tenon key in the prior art, the bearing force of the first section and the second section is transmitted to concrete through the cylindrical side surface, the force of the tenon key acting on the concrete generates component forces in the vertical direction and the horizontal direction, the component force in the horizontal direction generates horizontal tensile stress on a concrete bearing area below the tenon key, and the tensile strength of the concrete axle center is about 1/10 of the compressive strength of the axle center, so that the concrete structure at the beam end is easily damaged by the cylindrical tenon key due to the horizontal component force, the stress concentration area between the tenon key and the concrete is large, and the shear strength is low.
The further technical scheme is that the first embedded section and the second embedded section respectively comprise an anchoring structure; the anchoring structure is a cylindrical structure with the top surface and the bottom surface respectively connected with the end faces of the cuboids at the two ends, and the outer diameter of the cylindrical structure is smaller than that of the cuboids at the two ends. This technical scheme forms the anchor structure through the cuboid and the cylinder of different external diameters, improves the anchor power between steel tenon key and the concrete.
The further technical proposal is that the seam of the first segment and the second segment is a flat seam. In the technical scheme, the flat joint with the steel tenon key is adopted to replace a tooth key joint in the prior art, so that the design of the section beam end can be simplified, the close-fitting pouring of the conventional section assembling joint is cancelled, and the prefabrication process is simplified.
The utility model has the advantages that:
the utility model provides a steel tenon key for improving shear strength of precast beam segment assembly, the axial both ends of the first pre-buried section and the second pre-buried section are made into cuboid structures, the bearing capacity of the first segment and the second segment is transmitted to the concrete through the cuboid side surface in the vertical direction, the concrete only bears the pressure in the vertical direction, the beam end concrete structure is not easy to damage, and the bearing capacity is transmitted through the plane, the stress concentration area between the steel tenon key and the concrete is small, and the shear strength is high; the flat joint with the steel tenon key is adopted to replace a tooth key joint in the prior art, so that the design of the section beam end can be simplified, the close-fitting pouring of the conventional section assembling joint is omitted, and the prefabrication process is simplified.
Drawings
FIG. 1 is a diagram: the precast beam structure schematic diagram of the prior art adopting the cylindrical tenon key.
FIG. 2 is a diagram of: the cylindrical tenon key structure in the prior art is schematically shown.
FIG. 3 is a diagram of: in the prior art, a schematic diagram of analyzing the stress of concrete at the beam end of a cylindrical tenon key is adopted.
FIG. 4 is a diagram of: adopt both ends to be the precast beam structure schematic diagram of the steel tenon key of cuboid.
FIG. 5 is a diagram: the both ends are the structural schematic diagram of the steel tenon key of cuboid.
FIG. 6 is a diagram of: the both ends are the steel tenon key grafting structure sketch map of cuboid.
FIG. 7 is a diagram of: adopt both ends to be the tenon key beam-ends concrete atress analysis schematic diagram of cuboid.
In the figure:
1. a first segment; 2. a second segment; 10. a tenon component; 100. a first pre-buried section; 11. a tenon; 12. a first end of a first embedded section; 13. a second end of the first embedded section; 14. the first embedded section cylindrical anchoring structure; 20. a mortise assembly; 200. a second pre-buried section; 21. mortising holes; 22. a first end of a second embedded section; 23. a second end of the second embedded section; 24. a second embedded section cylindrical anchoring structure; 3. and (3) concrete.
Detailed Description
The present invention will be described in detail below with reference to fig. 1 to 7, a comparative example, and a specific embodiment, and features in the following examples and examples may be combined with each other without conflict.
Comparative example, as shown in fig. 1 to 3, there is provided a steel dowel for assembling precast beam segments of the prior art, the precast beam comprising a first segment 1 and a second segment 2 assembled by a flush joint, the steel dowel comprising a tenon assembly 10 and a mortise assembly 20, the tenon assembly 10 and the mortise assembly 20 being installed at opposite ends of the first segment 1 and the second segment 2, respectively; the tenon assembly 10 comprises a first embedded section 100 embedded in the first section 1 and a tenon 11 protruding out of the end face of the first section 1, and the first embedded section 100 and the tenon 11 are coaxial and are integrally formed; the mortise assembly 20 comprises a second embedded section 200 embedded in the second section 2 and a mortise 21 arranged at the end of the second embedded section 200, the mortise 21 is coaxial with the second embedded section 200 and is inserted into the tenon 11, and the tenon 11 is in clearance fit with the mortise 21; a first embedded section first end 12 and a first embedded section second end 13 along the axial direction of the first embedded section 100 are both cylindrical structures, and a second embedded section first end 22 and a second embedded section second end 23 along the axial direction of the second embedded section 200 are both cylindrical structures; the first embedded section first end 12 and the first embedded section second end 13 are connected through a first embedded section cylindrical anchoring structure 14, and the outer diameter of the first embedded section cylindrical anchoring structure 14 is smaller than the outer diameters of the first embedded section first end 12 and the first embedded section second end 13; the first end 22 of the second embedded section is connected with the second end 23 of the second embedded section through a second embedded section cylindrical anchoring structure 24, and the outer diameter of the second embedded section cylindrical anchoring structure 24 is smaller than the outer diameters of the first end 22 of the second embedded section and the second end 23 of the second embedded section;
in this comparative example, as shown in figure 3, the steel tenon transmits a force Fq to the concrete 3, Fq via the cylindrical structure when the first segment 1 and the second segment 2 are in relative shear motion3For vertical downward force, Fq1And Fq2Acting in an oblique direction, e.g. Fq1Can be decomposed into horizontal acting force F1And a vertical force F2Horizontal squareActing force F1Horizontal tensile stress is generated on the bearing area of the concrete 3 below the tenon key, and the axial tensile strength of the concrete 3 is about 1/10 of the axial compressive strength, so that the horizontal acting force F acted on the concrete 3 by the cylindrical tenon key in the comparative example1Can result in damage to the beam end concrete structure.
As shown in fig. 4 to 7, the present embodiment provides a steel key for improving the shear strength of a prefabricated beam segment assembly, the prefabricated beam comprising a first segment 1 and a second segment 2 assembled by a flush joint, the steel key comprising a tenon assembly 10 and a mortise assembly 20, the tenon assembly 10 and the mortise assembly 20 being respectively mounted at opposite ends of the first segment 1 and the second segment 2; the tenon assembly 10 comprises a first embedded section 100 embedded in the first section 1 and a tenon 11 protruding out of the end face of the first section 1, and the first embedded section 100 and the tenon 11 are coaxial and are integrally formed; the mortise assembly 20 comprises a second embedded section 200 embedded in the second section 2 and a mortise 21 arranged at the end of the second embedded section 200, the mortise 21 is coaxial with the second embedded section 200 and is inserted into the tenon 11, and the tenon 11 is in clearance fit with the mortise 21; a first embedded section first end 12 and a first embedded section second end 13 along the axial direction of the first embedded section 100 are both of cuboid structures, and a second embedded section first end 22 and a second embedded section second end 23 along the axial direction of the second embedded section 200 are both of cuboid structures; the first embedded section first end 12 and the first embedded section second end 13 are connected through a first embedded section cylindrical anchoring structure 14, and the outer diameter of the first embedded section cylindrical anchoring structure 14 is smaller than the outer diameters of the first embedded section first end 12 and the first embedded section second end 13, so that the anchoring force of the first embedded section 100 and the concrete 3 is improved; the first end 22 of the second embedded section is connected with the second end 23 of the second embedded section through a second embedded section cylindrical anchoring structure 24, and the outer diameter of the second embedded section cylindrical anchoring structure 24 is smaller than the outer diameters of the first end 22 of the second embedded section and the second end 23 of the second embedded section, so that the anchoring force of the second embedded section 200 and the concrete 3 is improved;
the specific assembling method of the embodiment comprises the following steps:
A) installing a template, installing the template of the prefabricated segment, wherein two ends of the template are of flat joint structures, reserving a prestressed duct at a preset position, and binding a reinforcing mesh; the flat joint structure can simplify the process design of the tooth joint section beam end in the prior art, eliminates the close-fitting pouring of the traditional section splicing joint, and simplifies the prefabrication process;
B) pre-embedding steel tenon keys, determining the number, size and arrangement positions of the steel tenon keys according to the shear design to be borne by the splicing joints of the sectional beams, pre-embedding a tenon component 10 and a mortise component 20 which are matched with each other at the opposite end parts of the first section 1 and the second section 2 respectively, and pouring concrete; respectively embedding the first embedded section 100 and the second embedded section 200 in the concrete of the first section 1 and the second section 2, so that the tenon 11 protrudes out of the first section 1, and the tenon hole 21 is exposed at the end part of the second section 2;
C) assembling and positioning, namely controlling the relative positions of the first section 1 and the second section 2 through a hoisting device to enable the tenon 11 to be coaxial with the tenon hole 21;
D) splicing connection, namely connecting a first section 1 and a second section 2 through a tenon 11 and a tenon hole 21, wherein the tenon 11 is inserted into the tenon hole 21 and is in clearance fit with the tenon hole 21;
E) and (4) tensioning construction, namely penetrating the prestressed tendons in the reserved prestressed duct, installing gaskets and anchors at two ends and tensioning the prestressed tendons.
In the present embodiment, as shown in fig. 7, when the first segment 1 and the second segment 2 generate relative shearing motion, the steel tenon key transmits acting force Fq of the first segment 1 and the second segment 2 to the concrete 3 through the side surfaces of the rectangular structures at the two ends of the first embedded segment 100 and the second embedded segment 200 in the vertical direction, and Fq are both vertical downward acting forces; compared with a curved surface structure in the prior art, the planar structure in the embodiment can reduce stress concentration between the steel tenon key and concrete and improve the shear strength; in addition, the splicing structure with the flat joints can simplify the process design of the tooth joint section beam ends in the prior art, can cancel the close-fitting pouring of the conventional section splicing joints, and simplifies the prefabrication process.
The above embodiments exemplarily show that the first segment 1 and the second segment 2 are assembled by a flat seam, and according to other embodiments or practical applications, the first segment 1 and the second segment 2 can also be assembled by a dense-tooth or sparse-tooth structure.
The embodiment exemplarily shows that the precast beam assembly structure comprises a first section 1 and a second section 2, the first section 1 is embedded with a tenon assembly 10 relative to the end surface of the second section 2, the second section 2 is embedded with a mortise assembly 20 relative to the end surface of the first section 1, in other embodiments or practical applications, the precast beam further comprises a third section assembled with the other end of the first section 1, and a fourth section assembled with the other end of the second section 2, the end surfaces of the first section 1 and the third section are respectively embedded with the tenon assembly 10 and the mortise assembly 20, and the end surfaces of the second section 2 and the fourth section are respectively embedded with the tenon assembly 10 and the mortise assembly 20; or the opposite end surfaces of the first section 1 and the third section are respectively embedded with the tenon hole component 20 and the tenon component 10, and the opposite end surfaces of the second section 2 and the fourth section are respectively embedded with the tenon hole component 20 and the tenon component 10; that is, both ends of the first segment 1 may be the tenon component 10 or one end may be the tenon component 10 and the other end may be the mortise component 20, and both ends of the second segment 2 may be the mortise component 20 or one end may be the tenon component 10 and the other end may be the mortise component 20.
The above embodiment exemplarily shows that the first embedded segment 100 and the second embedded segment 200 are respectively provided with an anchoring structure, which is only for improving the anchoring force between the embedded segments and the concrete, and in other embodiments with sufficient anchoring force, the anchoring structure is an unnecessary technical feature.
The utility model provides a pair of improve precast beam segment and assemble shear strength's steel tenon key makes into the cuboid structure with first pre-buried section 100 and the axial both ends of second pre-buried section 200, transmits the bearing capacity of first section 1 and second section 2 to concrete 3 through the cuboid side in the vertical direction, and concrete 3 only bears the pressure of vertical direction, not fragile beam-ends concrete structure, and transmits the bearing capacity through the plane, and the stress concentration area is little between steel tenon key and the concrete, and shear strength is high; the flat joint with the steel tenon key is adopted to replace a tooth key joint in the prior art, so that the design of the section beam end can be simplified, the close-fitting pouring of the conventional section assembling joint is omitted, and the prefabrication process is simplified.
Claims (3)
1. A steel tenon key for improving the assembling shear strength of a precast beam segment, wherein the precast beam at least comprises a first segment and a second segment; the steel tenon key is characterized by comprising a tenon component and a mortise component which are matched, wherein the tenon component and the mortise component are respectively arranged at the opposite ends of the first section and the second section; the tenon assembly comprises a first embedded section embedded in the first section and a tenon protruding out of the end face of the first section, and the first embedded section and the tenon are coaxial and are integrally formed; the tenon hole assembly comprises a second embedded section embedded in the second section and a tenon hole formed in the end part of the second embedded section, and the tenon hole is coaxial with the second embedded section; the axial both ends of first pre-buried section and second pre-buried section are the cuboid structure.
2. The steel tenon key for improving the splicing shear strength of the precast beam segments according to claim 1, wherein the first embedded segment and the second embedded segment further comprise an anchoring structure respectively; the anchoring structure is a cylindrical structure with the top surface and the bottom surface respectively connected with the end faces of the cuboids at the two ends, and the outer diameter of the cylindrical structure is smaller than that of the cuboids at the two ends.
3. The steel tenon key for improving the splicing shear strength of the precast beam segments according to claim 1, wherein the joints of the first segment and the second segment are flat joints.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020876505.5U CN212358590U (en) | 2020-05-22 | 2020-05-22 | Steel tenon key for improving assembling shear strength of precast beam segments |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020876505.5U CN212358590U (en) | 2020-05-22 | 2020-05-22 | Steel tenon key for improving assembling shear strength of precast beam segments |
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| CN212358590U true CN212358590U (en) | 2021-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113221220A (en) * | 2021-05-11 | 2021-08-06 | 北京城建设计发展集团股份有限公司 | Method for calculating shearing resistance and bearing capacity of grouting type mortise joint of assembled underground structure |
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2020
- 2020-05-22 CN CN202020876505.5U patent/CN212358590U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113221220A (en) * | 2021-05-11 | 2021-08-06 | 北京城建设计发展集团股份有限公司 | Method for calculating shearing resistance and bearing capacity of grouting type mortise joint of assembled underground structure |
| CN113221220B (en) * | 2021-05-11 | 2023-10-27 | 北京城建设计发展集团股份有限公司 | Method for calculating shearing bearing capacity of grouting tongue-and-groove joint of assembled underground structure |
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