CN111335465A - Rotatable self-resetting node connecting structure of assembled concrete beam column and assembling method - Google Patents
Rotatable self-resetting node connecting structure of assembled concrete beam column and assembling method Download PDFInfo
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- CN111335465A CN111335465A CN202010202725.4A CN202010202725A CN111335465A CN 111335465 A CN111335465 A CN 111335465A CN 202010202725 A CN202010202725 A CN 202010202725A CN 111335465 A CN111335465 A CN 111335465A
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- 229910000831 Steel Inorganic materials 0.000 claims description 240
- 239000010959 steel Substances 0.000 claims description 240
- 210000002435 tendon Anatomy 0.000 claims description 73
- 230000002787 reinforcement Effects 0.000 claims description 48
- 239000002184 metal Substances 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 claims description 36
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- 239000011148 porous material Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
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- 239000011178 precast concrete Substances 0.000 abstract description 12
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/22—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material with parts being prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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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
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
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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
- E04C5/08—Members specially adapted to be used in prestressed constructions
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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
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
Abstract
The invention provides a rotatable self-resetting node connecting structure and an assembling method for an assembled concrete beam column. The problems that the dry-type connecting joint is poor in energy consumption and serious in deformation under the action of a strong earthquake are solved, connection between the precast concrete beam and the precast reinforced concrete column is achieved, the requirements in actual design and construction are met, the bending rigidity of the joint can be effectively guaranteed through the pretightening force applied to the high-strength bolt, and the joint is kept in an elastic state under the condition that the earthquake action is small.
Description
Technical Field
The invention relates to a rotatable self-resetting node connecting structure of an assembled concrete beam column and an assembling method, and belongs to the technical field of assembled concrete buildings.
Background
The prefabricated concrete structure has the advantages of energy conservation, environmental protection, time saving, high efficiency, convenient construction and the like, and is widely popularized in China in recent years. As a core part of a fabricated concrete structure, a node and a connection mode thereof have been important issues of research and attention in the academic and engineering circles.
In the traditional fabricated concrete structure, beam columns can be prefabricated, and nodes are mainly connected in a cast-in-place mode so as to achieve the purpose of equal cast-in-place of the whole structure. The cast-in-place method can ensure that the node has enough strength, rigidity and good energy consumption capability, but a large amount of concrete wet operation is still needed in a construction site, and the development concept of green, environment-friendly, energy-saving and efficient assembly type buildings cannot be met. With the development and progress of the technology, dry joining techniques represented by sleeve grouting, constraint grout anchor and post-cast strip joining have been gradually developed. Experimental research shows that the connection mode can ensure the rigidity and the bearing capacity of the joint connection area, is reliable in stress, but poor in energy consumption, and is easy to cause brittle failure at the grouting position under the action of repeated earthquake load. Therefore, how to effectively solve the problems that the dry type connecting node is poor in energy consumption and serious in deformation under the action of a strong shock is a key point which needs to be paid attention to in the field of research of the current prefabricated concrete structure node.
Disclosure of Invention
The invention aims to solve the technical problems in the background art, and provides a novel rotatable self-resetting node connecting structure and an assembling method for an assembled concrete beam column, which are used for realizing the connection between a prefabricated concrete beam and a prefabricated reinforced concrete column so as to meet the requirements in actual design and construction.
The invention provides a rotatable self-resetting node connecting structure of an assembly type concrete beam column, which comprises a U-shaped connecting steel plate key, a prefabricated reinforced concrete column, a prefabricated reinforced concrete beam, a herringbone connecting steel plate key, a rotatable positioning bolt group, a plurality of prestressed tendons and a plurality of prestressed tendon anchors, wherein the U-shaped connecting steel plate key is positioned and installed on the prefabricated reinforced concrete column, the herringbone connecting steel plate key is positioned and installed on the prefabricated reinforced concrete beam, the prefabricated reinforced concrete beam and the prefabricated reinforced concrete column are vertically connected through the matching of the U-shaped connecting steel plate key and the herringbone connecting steel plate key, the U-shaped connecting steel plate key and the herringbone connecting steel plate key are oppositely arranged and are connected through the matching of the rotatable positioning bolt group, the relative rotation can be realized, the plurality of prestressed tendons sequentially cross the prefabricated reinforced concrete beam, the U-shaped connecting steel plate key and the herringbone connecting steel plate key, and finally, penetrating out of the prefabricated reinforced concrete column, and correspondingly screwing each prestressed tendon anchorage at the extending end of each prestressed tendon for fixing.
Preferably, the U-shaped connecting steel plate key comprises a U-shaped fixing steel plate, two prestressed rib holes I, two bolt holes I and a bolt rotating groove I, the U-shaped bottom surface of the U-shaped fixing steel plate is connected with the prefabricated reinforced concrete column, the two prestressed rib holes I are arranged on the U-shaped fixing steel plate, the upper portions of the left wing plate wall and the right wing plate wall of the U-shaped fixing steel plate 1 are provided with the opposite bolt holes I, the lower portions of the left wing plate wall and the right wing plate wall of the U-shaped fixing steel plate 1 are provided with the opposite bolt rotating grooves I, and the bolt.
Preferably, the prefabricated reinforced concrete column comprises a plurality of column longitudinal stress steel bars, column stirrups, positioning steel bars I and metal corrugated pipes I, the column longitudinal stress steel bars and the column stirrups are mutually and vertically welded to form a longitudinal steel bar framework, concrete is poured outside the steel bar framework to form a column body in a prefabricated mode, the front face and the rear face of the steel bar framework are provided with the positioning steel bars I, the metal corrugated pipes I are arranged on the positioning steel bars I along the direction of the prestressed tendons, the hollow area inside the metal corrugated pipes I serves as prestressed tendon pore channels I and is used for penetrating through the prestressed tendons, the connecting face of the U-shaped connecting steel plate key is in welded connection with the steel bar framework according to the positions of the metal corrugated pipes I, and the prestressed tendon pore channels I are guaranteed to be aligned in the welding process.
Preferably, the Chinese character 'shan' shaped connecting steel plate key comprises a Chinese character 'shan' shaped rotating steel plate, two prestressed rib holes II, bolt holes II and bolt rotating grooves II, the bottom surface of the inverted-V-shaped connecting steel plate key is connected with the precast reinforced concrete beam in a positioning way, two prestressed rib holes II are arranged on the steel plate, opposite bolt holes II are arranged at the upper parts of the left wing plate wall and the right wing plate wall of the herringbone rotating steel plate, opposite bolt rotating grooves II are arranged at the lower parts of the herringbone rotating steel plate, the bolt rotating groove II is arc-shaped, the left wing plate wall and the right wing plate wall of the E-shaped rotating steel plate are inserted into the U-shaped fixing steel plate, the bolt hole II is the same as the bolt hole I in position and size, the bolt rotating groove II is the same as the bolt rotating groove I in position and size, the left width and the right width of the bolt rotating groove I are not more than one third of the width of the side plate wall of the U-shaped fixed steel plate 1, so that the U-shaped connecting steel plate key is ensured to have enough bending rigidity.
Preferably, the outer spacing between the outer side plate walls of the two wings of the herringbone rotating steel plate is equal to the inner spacing between the inner side plate walls of the two wings of the fixed steel plate 1, and the height of the herringbone rotating steel plate is equal to that of the U-shaped fixed steel plate 1, so that the herringbone connecting steel plate key can be inserted into the U-shaped connecting steel plate key in parallel.
Preferably, the precast reinforced concrete beam comprises a plurality of beam hogging moment tendons, beam positive bending moment tendons, beam stirrups, positioning steel bars II and metal corrugated pipes II, the beam hogging moment tendons, the beam positive bending moment tendons and the beam stirrups are vertically welded into a transverse steel bar framework, concrete is poured outside the steel bar framework to form a beam, the positioning steel bars II are installed on the front and the back of the steel bar framework, the metal corrugated pipes II are installed on the positioning steel bars II along the direction of the prestressed steel bars, the hollow area inside the metal corrugated pipes II serves as a prestressed steel hole channel II and is used for penetrating the prestressed steel bars, the connecting surface of a U-shaped connecting steel plate key is welded with the steel bar framework according to the position of the metal corrugated pipes II, and the prestressed steel hole II is aligned with the prestressed steel hole II in the welding process.
Preferably, the rotary positioning bolt group comprises two high-strength bolts, four nuts and two friction gaskets, wherein one high-strength bolt penetrates through the bolt hole II and the bolt hole I which are overlapped and is fixed through the two nuts, the other high-strength bolt penetrates through the bolt rotating groove II and the bolt rotating groove I which are overlapped and slides left and right along the grooves, the upper height and the lower height of the bolt rotating groove I are equal to the outer diameter of a screw rod penetrating through the high-strength bolt in the groove, the other high-strength bolt is fixed through the two nuts, and the friction gaskets are arranged between the two nuts and the outer side plate walls of the left wing and the right wing of the U-shaped connecting steel plate key.
Preferably, the length of a screw rod of the high-strength bolt is greater than or equal to the sum of the distance between the outer side plate walls of the left wing and the outer side plate wall of the right wing of the U-shaped connecting steel plate key and the thickness of the nut, and the outer diameter of the screw rod of the high-strength bolt is determined by shear force transmitted between the prefabricated parts through calculation.
Preferably, the friction pad is made of copper material, and the side of the friction pad, which is contacted with the U-shaped connecting steel plate key, is roughened to increase the friction resistance.
The assembling method of the rotatable self-resetting node connecting structure of the assembled concrete beam column specifically comprises the following steps:
(1) hoisting the prefabricated reinforced concrete column and the prefabricated reinforced concrete beam to a preset position, slowly moving the prefabricated reinforced concrete beam to enable the outer sides of the two wing plate walls of the E-shaped connecting steel plate key to be inserted into the inner sides of the two wing plate walls of the U-shaped connecting steel plate key in parallel until the bolt hole I and the bolt hole II, aligning the bolt rotating groove I and the bolt rotating groove II with each other, enabling the E-shaped connecting steel plate key not to be completely inserted into the U-shaped connecting steel plate key at the moment, and reserving a certain gap between the bolt rotating groove I and the bolt rotating groove II for relative rotation;
(2) guiding the prestressed tendons to sequentially pass through a prestressed tendon duct II, a prestressed tendon hole I and a prestressed tendon duct I and penetrate out of the prefabricated reinforced concrete column, then tensioning the prestressed tendons at one side of the prefabricated reinforced concrete beam, and fixing the unbonded prestressed tendons at one side of the prefabricated reinforced concrete column by adopting a prestressed tendon anchorage device;
(3) after the unbonded prestressed tendons are tensioned and anchored, friction gaskets are placed on two sides of the center positions of the bolt rotating groove I and the bolt rotating groove II, then the high-strength bolts respectively penetrate through the bolt hole I, the bolt hole II and the round holes in the friction gaskets, the nuts are screwed by using the torque wrench, and the pretightening force applied by the torque wrench is determined by shear force transmitted among prefabricated parts.
The rotatable self-resetting node connecting structure and the assembling method of the assembled concrete beam column have the beneficial effects that:
1. the U-shaped connecting steel plate key and the E-shaped connecting steel plate key which are used for connecting the prefabricated reinforced concrete column and the prefabricated concrete beam are screwed and connected through the high-strength bolt, and the bending rigidity of the node can be effectively guaranteed by the pretightening force applied to the high-strength bolt, so that the node is kept in an elastic state under the condition of small earthquake action.
2. The invention adopts the E-shaped connecting steel plate key, and can use the high-strength bolt as a central shaft under the action of moderate earthquake to enable the precast concrete beam to rotate up and down in a certain range. In the process, friction and energy dissipation are generated between the inner and outer plate walls of the two wings of the E-shaped connecting steel plate key and the U-shaped connecting steel plate key and between the friction gaskets and the walls of the two wings of the U-shaped connecting steel plate key, the redundancy of the nodes is increased while the shearing force of the beam ends is born, obvious plastic deformation of the precast beam column can be avoided, and the effect of first-stage self-resetting is achieved. In addition, high strength bolt and friction pad can be changed according to actual demand, and the operation is swift convenient.
3. The bending moment transmitted between the prefabricated parts is borne by the unbonded prestressed tendons. Under the action of strong shock, when the precast concrete beam reaches a controllable maximum rotation state relative to the precast reinforced concrete column, the unbonded prestressed tendons begin to play a self-resetting role in the second stage so as to ensure that the precast beam column is restored to the original initial state after the shock.
4. The parts with higher manufacturing requirements of the invention, including the manufacturing of the precast reinforced concrete columns, the precast concrete beams, the U-shaped connecting steel plate keys and the herringbone connecting steel plate keys, can be assembled in sequence after being transported to the site in a factory, the installation process is simple and clear, the learning requirement on workers is lower, no concrete wet operation exists on the construction site, and the invention conforms to the development concept of green, environment-friendly, energy-saving and high-efficiency assembly type buildings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a three-dimensional view of a U-shaped connecting steel plate key according to the present invention;
FIG. 2 is a three-dimensional view of the arrangement of reinforcing bars in the prefabricated reinforced concrete column according to the present invention;
FIG. 3 is a three-dimensional view of the present invention after the U-shaped connecting steel plate key and the steel bars in the prefabricated reinforced concrete column are welded;
FIG. 4 is a three-dimensional view of a prefabricated reinforced concrete column according to the present invention;
FIG. 5 is a three-dimensional view of a key for connecting steel plates in the shape of a Chinese character 'shan' according to the present invention;
fig. 6 is a three-dimensional view illustrating arrangement of reinforcing bars in a precast concrete beam according to the present invention;
FIG. 7 is a three-dimensional view of the welded key of the E-shaped connecting steel plate and the welded steel bar in the precast concrete beam according to the present invention;
fig. 8 is a three-dimensional view of a precast concrete beam according to the present invention;
FIG. 9 is a three-dimensional view of a high tensile bolt according to the present invention;
FIG. 10 is a three-dimensional view of a nut according to the present invention;
FIG. 11 is a three-dimensional view of a friction pad according to the present invention;
fig. 12 is a three-dimensional view of a tendon according to the present invention;
FIG. 13 is a three dimensional view of a tendon anchor according to the present invention;
FIG. 14 is a three-dimensional view of the prefabricated reinforced concrete column and the prefabricated concrete beam of the present invention after being hoisted, the key of the inverted-V-shaped connecting steel plate is inserted into the key of the U-shaped connecting steel plate;
fig. 15 is a three-dimensional view of unbonded tendons according to the invention after passing through all prefabricated elements;
FIG. 16 is a three-dimensional view of unbonded tendon anchors of the present invention after tensioning and securing;
FIG. 17 is a three-dimensional view of the present invention after the high-strength bolts are fastened and tightened with the U-shaped connecting steel plate keys and the E-shaped connecting steel plate keys;
fig. 18 is a three-dimensional view showing a state in which a precast concrete beam is rotated upward by an earthquake according to the present invention;
fig. 19 is a three-dimensional view illustrating a state in which a precast concrete beam is rotated downward by an earthquake according to the present invention;
shown in the figure: 1-U-shaped fixed steel plates; 2-prestressed rib holes I; 3-bolt hole I; 4-bolt rotation groove I; 5-column longitudinal stress steel bars; 6-column stirrup; 7-positioning the steel bar I; 8-metal bellows I; 9-prestressed tendon duct I; 10-a chevron-shaped rotating steel plate; 11-prestressed rib holes II; 12-bolt hole II; 13-bolt rotation groove II; 14-beam hogging moment tendon; 15-beam positive bending moment rib; 16-beam stirrups; 17-positioning a steel bar II; 18-metal bellows ii; 19-prestressed tendon pore channel II; 20-high strength bolts; 21-a nut; 22-nut holes; 23-a rubbing pad; 24-a circular hole; 25-prestressed tendons; 26-prestressed tendon anchorage.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: the present embodiment is explained with reference to fig. 1 to 19. The assembly type concrete beam column rotatable self-resetting node connecting structure comprises a U-shaped connecting steel plate key, a prefabricated reinforced concrete column, a prefabricated reinforced concrete beam, a herringbone connecting steel plate key, a rotary positioning bolt group, a plurality of prestressed tendons 25 and a plurality of prestressed tendon anchors 26, wherein the U-shaped connecting steel plate key is installed on the prefabricated reinforced concrete column in a positioning mode, the herringbone connecting steel plate key is installed on the prefabricated reinforced concrete beam in a positioning mode, the prefabricated reinforced concrete beam and the prefabricated reinforced concrete column are vertically connected through the matching of the U-shaped connecting steel plate key and the herringbone connecting steel plate key, the U-shaped connecting steel plate key and the herringbone connecting steel plate key are oppositely arranged and are connected through the matching of the rotary positioning bolt group, the relative rotation can be realized, the plurality of prestressed tendons 25 sequentially penetrate through the prefabricated reinforced concrete beam, the U-shaped connecting steel plate key and the herringbone connecting steel plate key, finally, the prestressed tendon anchors penetrate out of the prefabricated reinforced concrete column, and each prestressed tendon anchor 26 is correspondingly screwed at the extending end of each prestressed tendon 25 to be fixed.
U type connecting steel plate key includes U type fixed steel sheet 1, two prestressing force muscle holes I2, two bolt holes I3 and bolt rotation groove I4, U type fixed steel sheet 1's U type bottom surface and prefabricated reinforced concrete column connection are provided with two prestressing force muscle holes I2 on it, the upper portion position of the left and right sides both wings board wall of U type fixed steel sheet 1 is provided with relative bolt hole I3, and the lower part position is provided with relative bolt rotation groove I4, bolt rotation groove I4 is the arc.
The prefabricated reinforced concrete column comprises a plurality of column longitudinal stress steel bars 5, column hoops 6, positioning steel bars I7 and metal corrugated pipes 8I, wherein the column longitudinal stress steel bars 5 and the column hoops 6 are perpendicularly welded to form a longitudinal steel bar framework, concrete is poured outside the steel bar framework to be prefabricated into a column body, the front and back surfaces of the steel bar framework are provided with the positioning steel bars I7, the metal corrugated pipes I8 are arranged on the positioning steel bars I7 along the direction of prestressed ribs 25, the hollow areas inside the metal corrugated pipes I8 serve as prestressed rib channels I9 and are used for penetrating through the prestressed ribs 25, the connecting surfaces of U-shaped connecting steel plate keys are welded with the steel bar framework according to the positions of the metal corrugated pipes I8, and the prestressed rib holes I2 are aligned with the prestressed rib channels I9 in the welding process.
The inverted-V-shaped connecting steel plate key comprises an inverted-V-shaped rotating steel plate 10, two prestressed rib holes II 11, bolt holes II 12 and bolt rotating grooves II 13, the inverted-V-shaped bottom surface of the inverted-V-shaped connecting steel plate key is connected with a prefabricated reinforced concrete beam in a positioning mode, the two prestressed rib holes II 11 are arranged on the inverted-V-shaped connecting steel plate key, the upper portions of the left and right wing plate walls of the inverted-V-shaped rotating steel plate 10 are provided with opposite bolt holes II 12, the lower portions of the left and right wing plate walls of the inverted-V-shaped rotating steel plate 10 are provided with opposite bolt rotating grooves II 13, the bolt rotating grooves II 13 are arc-shaped, the left and right wing plate walls of the inverted-V-shaped rotating steel plate 10 are inserted into the U-shaped fixing steel plate 1, the bolt holes II 12 and the bolt holes I3 are the same in position size, the bolt rotating grooves II 13 and I4 are the same in position size, so as to ensure that the U-shaped connecting steel plate key has enough bending rigidity.
The precast reinforced concrete beam comprises a plurality of beam negative-moment reinforcements 14, beam positive-moment reinforcements 15, beam stirrups 16, positioning reinforcements II 17 and metal corrugated pipes II 18, wherein the beam negative-moment reinforcements 14, the beam positive-moment reinforcements 15 and the beam stirrups 16 are vertically welded to form a transverse reinforcement framework, concrete is precast to form the beam outside the reinforcement framework, the positioning reinforcements II 17 are installed on the front and back of the reinforcement framework, the metal corrugated pipes II 18 are installed on the positioning reinforcements II 17 along the direction of the prestressed reinforcements 25, the hollow area inside the metal corrugated pipes II 18 serves as prestressed reinforcement channels II 19 and is used for penetrating the prestressed reinforcements 25, the connecting surface of a U-shaped connecting steel plate key is welded with the reinforcement framework according to the position of the metal corrugated pipes II 18, and the prestressed reinforcement holes II 11 are aligned with the prestressed reinforcement channels II 19 in the welding process.
The rotary positioning bolt group comprises two high-strength bolts 20, four nuts 21 and two friction gaskets 23, wherein one high-strength bolt 20 penetrates through a bolt hole II 12 and a bolt hole I3 which are overlapped and is fixed through the two nuts 21, the other high-strength bolt 20 penetrates through a bolt rotating groove II 13 and a bolt rotating groove I4 which are overlapped and slides left and right along the grooves, the upper height and the lower height of the bolt rotating groove I4 are equal to the outer diameter of a screw rod penetrating through the high-strength bolt 20 in the groove, the other high-strength bolt 20 is also fixed through the two nuts 21, and the friction gaskets 23 are arranged between the two nuts 21 and the outer side plate walls of the left wing and the right wing of the U-shaped connecting steel plate key.
(1) As shown in fig. 1, the specific structure and manufacturing process of the U-shaped connecting steel plate key are as follows:
the U-shaped connecting steel plate key (figure 1) is composed of a U-shaped fixing steel plate 1, prestressed rib holes I2, bolt holes I3 and bolt rotating grooves I4, the side faces of the wall of a front plate connected by the U-shaped fixing steel plate 1 and a prefabricated part are provided with the prestressed rib holes I2 in a double-face through drilling mode, and the positions, the number and the sizes of the prestressed rib holes I2 are determined by the positions, the numbers and the sizes of unbonded prestressed ribs 25 in the penetrating holes. The bolt holes I3 are formed in the side faces of the left wing plate wall and the right wing plate wall of the U-shaped fixing steel plate 1 in the upper area in a double-face through drilling mode, the positions of the bolt holes I3 are determined according to design requirements, and the size of the bolt holes is determined by the size of the high-strength bolts 20 penetrating through the holes. The left and right wing plate wall side faces and the lower area of the U-shaped fixed steel plate 1 are provided with bolt rotating grooves I4 in a turning groove or milling machine machining mode, the bolt rotating grooves I4 are arc-shaped, and the central position is determined according to design requirements. The upper and lower height of the bolt rotating groove I4 is equal to the outer diameter of a screw rod of the high-strength bolt 20 passing through the groove, and the left and right width is not more than one third of the width of the plate wall, so that the U-shaped connecting steel plate key (shown in figure 1) has enough bending rigidity.
The thickness of the front plate wall of the U-shaped fixed steel plate 1 is more than or equal to the thickness of the concrete protective layer of the prefabricated part connected with the U-shaped fixed steel plate so as to ensure that a certain gap is reserved between the E-shaped connecting steel plate key (figure 5) and the U-shaped connecting steel plate key (figure 1) for relative rotation. The remaining dimensions of the U-shaped fixed steel plate 1 are determined by calculation of the bending moment transmitted between the prefabricated parts.
(2) As shown in fig. 2 to 4, the concrete structure and manufacturing process of the prefabricated reinforced concrete column are as follows:
the steel bars in the prefabricated reinforced concrete column are composed of column longitudinal stress steel bars 5, column hooping bars 6 and positioning steel bars I7. The effect of positioning steel bar I7 lies in fixed metal bellows I8, and its position can be adjusted in a flexible way. After the reinforcement finishes, according to the design demand, at the regional ligature a plurality of corrugated metal pipes I8 (fig. 2) of framework of steel reinforcement in the middle part of framework of steel reinforcement, the inside hollow region of corrugated metal pipe I8 is as prestressing tendons pore I9 for pass unbonded prestressing tendons 25.
According to the position of the metal corrugated pipe I8, the U-shaped connecting steel plate key (shown in figure 1) is far away from one side of the plate wall of the two wings and is in welded connection with the steel reinforcement framework (shown in figure 3). In the welding process, the prestressed tendon hole I2 is aligned with the prestressed tendon duct I9, and the contact position between the holes has no relative dislocation.
And (3) supporting a template outside a steel reinforcement framework in the column, pouring concrete, pouring a protective layer of the concrete in the template to a thickness not more than the inner wall surface of the U-shaped connecting steel plate key (shown in figure 1), and removing the template after the concrete is solidified to finish the manufacturing of the prefabricated reinforced concrete column (shown in figure 4).
(3) As shown in fig. 5, the specific structure and manufacturing process of the chevron-shaped connecting steel plate key are as follows:
the key (shown in figure 5) of the E-shaped connecting steel plate consists of an E-shaped rotating steel plate 10, a prestressed rib hole II 11, a bolt hole II 12 and a bolt rotating groove II 13. The side face of the plate wall, connected with the E-shaped rotating steel plate 10 and the prefabricated part, is provided with a prestressed tendon hole II 11 in a double-sided through drilling mode, and the position, the number and the size of the prestressed tendon hole II 11 are determined by the position, the number and the size of unbonded prestressed tendons 25 penetrating through the hole. Bolt holes II 12 are formed in the upper area of the side faces of the left wing, the right wing and the middle wing of the E-shaped rotating steel plate 10 in a double-face through drilling mode, the size of each bolt hole II 12 is determined by the size of a high-strength bolt 20 penetrating through the corresponding hole, and the position of each bolt hole II 12 is determined by the position of a bolt hole I3 in the corresponding fixed steel plate 1 and the size of a reserved relative rotating gap between the E-shaped connecting steel plate key (shown in figure 5) and the U-shaped connecting steel plate key (shown in figure 1) according to design requirements.
The left and right wings and the side surfaces of the middle wing plate wall of the inverted-V-shaped rotating steel plate 10, a bolt rotating groove II 13 is arranged in the lower area in a grooving or milling machine machining mode, the bolt rotating groove II 13 is arc-shaped, the size is determined by the size of a bolt rotating groove I4 in the fixed steel plate 1, and the position is determined by the position of the bolt rotating groove I4 in the fixed steel plate 1 and the size of a reserved relative rotating gap between the inverted-V-shaped connecting steel plate key (figure 5) and the U-shaped connecting steel plate key (figure 1) according to design requirements.
The thickness of the front wall of the inverted-V-shaped rotating steel plate 10 is greater than or equal to the thickness of the concrete protective layer of the prefabricated part connected with the inverted-V-shaped rotating steel plate, so that a certain gap is reserved between the inverted-V-shaped connecting steel plate key (shown in figure 5) and the U-shaped connecting steel plate key (shown in figure 1) for relative rotation.
The clear distance between the outer side walls of the two wings of the E-shaped rotating steel plate 10 is equal to the clear distance between the inner side walls of the two wings of the fixed steel plate 1, and the height of the E-shaped rotating steel plate is equal to that of the fixed steel plate 1, so that the E-shaped connecting steel plate key (shown in figure 5) can be inserted into the U-shaped connecting steel plate key (shown in figure 1) in parallel.
(4) As shown in fig. 6 to 8, the concrete structure and the manufacturing process of the precast concrete beam are as follows:
the steel bars in the precast concrete beam are composed of beam negative bending moment bars 14, beam positive bending moment bars 15, beam stirrups 16 and positioning steel bars II 17. The positioning steel bar II 17 is used for fixing the metal corrugated pipe II 18, and the position of the metal corrugated pipe II can be flexibly adjusted. After the steel bars are bound, according to the positions and the number of the metal corrugated pipes I8 in the prefabricated reinforced concrete column (shown in figure 4), the same number of metal corrugated pipes II 18 are bound in the steel bar framework. The hollow area inside the metal corrugated pipe II 18 is used as a prestressed tendon channel II 19 for passing through the unbonded prestressed tendon 25.
According to the position of the metal corrugated pipe II 18, the E-shaped connecting steel plate key (shown in figure 5) is far away from the plate wall sides of the two wings and the middle wing and is welded with the steel reinforcement framework (shown in figure 7). In the welding process, the prestressed tendon hole II 11 and the prestressed tendon hole channel II 19 are ensured to be aligned, and the contact position between the holes has no relative dislocation.
And (3) supporting a template outside the steel reinforcement framework in the beam, pouring concrete, pouring a protective layer of the concrete in the template to a thickness not more than the inner wall surface of the E-shaped connecting steel plate key (shown in figure 5), and removing the template after the concrete is solidified to finish the manufacturing of the prefabricated reinforced concrete column (shown in figure 8).
(5) As shown in fig. 9 to 11, the specific structure and manufacturing process of the high-strength bolt, the nut and the friction washer are as follows:
the length of the screw rod of the high-strength bolt 20 is not less than the sum of the net distance between the outer side plate walls of the left wing and the right wing of the U-shaped connecting steel plate key (figure 1) and the thickness of the nut 21. The outer diameter of the high-strength bolt 20 is determined by calculation of the shear force transmitted between the prefabricated parts. The size of the nut hole 22 of the nut 21 is determined by the outer diameter of the screw of the high-tensile bolt 20.
The friction pad 23 is preferably made of copper, and the side contacting with the U-shaped connecting steel plate key (fig. 1) can be roughened to increase the friction resistance. The friction washer 23 is provided with a round hole 24, and the size of the round hole 24 is determined by the outer diameter of the screw of the high-strength bolt 20.
(6) As shown in fig. 12-13, the concrete structure and manufacturing process of the unbonded tendon and anchor head are as follows:
the material, number and size of the unbonded prestressed tendons 25 can be determined according to the actual design requirements.
The tendon anchor 26 may be a clip type anchor, a support type anchor or a cone plug type anchor, depending on the actual situation.
The components can be prefabricated or purchased in a factory and then transported to a construction site for assembly, and the specific assembly process is as follows:
(1) as shown in fig. 14, the prefabricated reinforced concrete column (fig. 4) and the prefabricated concrete beam (fig. 8) are hoisted to a predetermined position, the prefabricated concrete beam (fig. 8) is slowly moved to insert the outer sides of the two wing walls of the chevron-shaped connecting steel plate key (fig. 5) into the inner sides of the two wing walls of the U-shaped connecting steel plate key (fig. 1) in parallel until the bolt hole i 3 and the bolt hole ii 12 are reached, the bolt rotating groove i 4 and the bolt rotating groove ii 13 are aligned with each other, at this time, the chevron-shaped connecting steel plate key (fig. 5) is not completely inserted into the U-shaped connecting steel plate key (fig. 1), and a certain gap is reserved between the two for relative rotation.
(2) As shown in fig. 15 to 16, the unbonded tendon 25 is guided through all the prefabricated parts (fig. 15), and then the unbonded tendon 25 is tensioned at one side of the prefabricated concrete beam (fig. 8), while the unbonded tendon 25 is fixed at one side of the prefabricated reinforced concrete column (fig. 4) using a tendon anchor 26 (fig. 16).
(3) As shown in fig. 17, after the unbonded prestressed tendons 25 are tensioned and anchored, friction pads 23 are placed on two sides of the center positions of the bolt rotation groove i 4 and the bolt rotation groove ii 13, then the high-strength bolts 20 respectively penetrate through the bolt holes i 3, the bolt holes ii 12 and the round holes in the friction pads, the nuts 21 are screwed by the torque wrench, and the pretightening force applied by the torque wrench is determined by the shear force transmitted between the prefabricated parts.
In this embodiment, the U-shaped connecting steel plate key (fig. 1) and the two wing plate walls of the chevron-shaped connecting steel plate key (fig. 5) are tightly contacted with each other and connected by the high-strength bolt 20. The pretightening force applied to the high-strength bolt 20 can effectively ensure the bending rigidity of the node, so that the node can keep an elastic state under a small earthquake action.
Under the action of moderate earthquake, as shown in fig. 18-19, the key (fig. 5) of the inverted-V-shaped connecting steel plate can rotate upwards or downwards within the arc length range of the bolt rotating groove I4 and the bolt rotating groove II 13 by taking the high-strength bolt 20 penetrating through the bolt hole I3 and the bolt hole II 12 as a central shaft. In the process, friction is generated between the inner and outer plate walls of the two wings of the E-shaped connecting steel plate key (figure 5) and the U-shaped connecting steel plate key (figure 1) and between the friction gasket 23 and the wall of the two wings of the U-shaped connecting steel plate key (figure 1) and energy is dissipated, so that obvious plastic deformation of the precast beam column can be avoided, and the effect of self-resetting at the first stage is achieved.
The bending moment transmitted between the prefabricated parts is borne by the unbonded prestressed tendons 25. By prestressing the unbonded tendons 25, all the prefabricated parts are connected and prestressed. Under the action of strong shock, when the precast concrete beam (figure 8) reaches the controllable maximum rotation state, the unbonded prestressed tendons 25 begin to play the self-resetting role of the second stage so as to ensure that the precast beam column is restored to the original initial state after the shock.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The rotatable self-resetting node connecting structure of the assembled concrete beam column is characterized by comprising a U-shaped connecting steel plate key, a prefabricated reinforced concrete column, a prefabricated reinforced concrete beam, a reversed V-shaped connecting steel plate key, a rotating positioning bolt group, a plurality of prestressed reinforcements (25) and a plurality of prestressed reinforcement anchors (26), wherein the U-shaped connecting steel plate key is installed on the prefabricated reinforced concrete column in a positioning mode, the reversed V-shaped connecting steel plate key is installed on the prefabricated reinforced concrete beam in a positioning mode, the prefabricated reinforced concrete beam and the prefabricated reinforced concrete column are vertically connected through the matching of the U-shaped connecting steel plate key and the reversed V-shaped connecting steel plate key, the U-shaped connecting steel plate key and the reversed V-shaped connecting steel plate key are oppositely arranged and are connected through the rotating positioning bolt group in a matching mode, relative rotation can be achieved, and the plurality of prestressed reinforcements (25) sequentially cross the prefabricated reinforced concrete beam column, And the U-shaped connecting steel plate keys and the E-shaped connecting steel plate keys penetrate out of the prefabricated reinforced concrete column, and each prestressed tendon anchorage device (26) is correspondingly screwed at the extending end of each prestressed tendon (25) for fixing.
2. The assembly type concrete beam-column rotatable self-resetting node connecting structure according to claim 1, wherein the U-shaped connecting steel plate key comprises a U-shaped fixing steel plate (1), two prestressed reinforcement holes I (2), two bolt holes I (3) and a bolt rotating groove I (4), the U-shaped bottom surface of the U-shaped fixing steel plate (1) is connected with the prefabricated reinforced concrete column, the two prestressed reinforcement holes I (2) are arranged on the U-shaped fixing steel plate, the upper parts of the left wing plate wall and the right wing plate wall of the U-shaped fixing steel plate (1) are provided with the opposite bolt holes I (3), the lower parts of the left wing plate wall and the right wing plate wall of the U-shaped fixing steel plate are provided with the opposite bolt rotating grooves I (4), and the bolt rotating grooves I (4.
3. The rotatable self-resetting node connecting structure of the assembled concrete beam column according to claim 2, wherein the prefabricated reinforced concrete column comprises a plurality of column longitudinal stress steel bars (5), column stirrups (6), positioning steel bars I (7) and metal corrugated pipes I (8), the column longitudinal stress steel bars (5) and the column stirrups (6) are mutually and vertically welded to form a longitudinal steel reinforcement framework, concrete is poured outside the steel reinforcement framework to form a column body in a prefabricated mode, the positioning steel bars I (7) are installed on the front and back surfaces of the steel reinforcement framework, the metal corrugated pipes I (8) are installed on the positioning steel bars I (7) along the direction of the prestressed ribs (25), the hollow area inside the metal corrugated pipes I (8) serves as prestressed rib channels I (9) for penetrating through the prestressed ribs (25) according to the positions of the metal corrugated pipes I (8), the connecting surface of the U-shaped connecting steel plate key is welded with the steel reinforcement framework, and the prestressed tendon holes I (2) and the prestressed tendon holes I (9) are aligned in the welding process.
4. The assembly type concrete beam-column rotatable self-resetting node connection structure according to claim 2, wherein the herringbone connecting steel plate key comprises a herringbone rotating steel plate (10), two prestressed rib holes II (11), bolt holes II (12) and bolt rotating grooves II (13), the herringbone bottom surface of the herringbone connecting steel plate key is connected with the precast reinforced concrete beam in a positioning manner, the two prestressed rib holes II (11) are arranged on the herringbone connecting steel plate key, opposite bolt holes II (12) are arranged at the upper parts of the left and right wing plate walls of the herringbone rotating steel plate (10), opposite bolt rotating grooves II (13) are arranged at the lower parts of the herringbone rotating steel plate key, the bolt rotating grooves II (13) are arc-shaped, the left and right wing plate walls of the herringbone rotating steel plate (10) are inserted into the U-shaped fixed steel plate (1), and the bolt holes II (12) and the bolt holes I (3) are the same in position size, the bolt rotating groove II (13) and the bolt rotating groove I (4) are the same in position and size, the left width and the right width of the bolt rotating groove I (4) are not more than one third of the width of the side plate wall of the U-shaped fixed steel plate (1), and therefore the U-shaped connecting steel plate key is guaranteed to have enough bending rigidity.
5. The assembly type concrete beam-column rotatable self-resetting node connection structure according to claim 4, wherein the outer spacing between the outer side plate walls of the two wings of the herringbone rotating steel plate (10) is equal to the inner spacing between the inner side plate walls of the two wings of the U-shaped fixed steel plate (1), and the height of the herringbone rotating steel plate is equal to that of the U-shaped fixed steel plate (1), so that the herringbone connecting steel plate key can be inserted into the U-shaped connecting steel plate key in parallel.
6. The rotatable self-resetting node connecting structure of the assembled concrete beam column according to claim 4, wherein the prefabricated reinforced concrete beam comprises a plurality of beam negative moment reinforcements 1(4), beam positive moment reinforcements (15), beam stirrups (16), positioning reinforcements II (17) and metal corrugated pipes II (18), the beam negative moment reinforcements 1(4), the beam positive moment reinforcements (15) and the beam stirrups (16) are vertically welded into a transverse steel reinforcement framework, concrete is poured outside the steel reinforcement framework to form the beam, the positioning reinforcements II (17) are arranged at the front and the rear of the steel reinforcement framework, the metal corrugated pipes II (18) are arranged on the positioning reinforcements II (17) along the direction of the prestressed reinforcement (25), the hollow area inside the metal corrugated pipes II (18) is used as prestressed reinforcement channels II (19) for penetrating through the prestressed reinforcement (25), according to the position of the metal corrugated pipe II (18), the connecting surface of the U-shaped connecting steel plate key is in welded connection with the steel reinforcement framework, and in the welding process, the prestressed reinforcement hole II (11) is ensured to be aligned with the prestressed reinforcement hole channel II (19).
7. The fabricated concrete beam-column rotatable self-resetting nodal connection structure of claim 4, it is characterized in that the rotary positioning bolt group comprises two high-strength bolts (20), four nuts (21) and two friction gaskets (23), one high-strength bolt (20) penetrates through the superposed bolt hole II (12) and the superposed bolt hole I (3), and is fixed by two nuts (21), the other high-strength bolt (20) passes through the superposed bolt rotating groove II (13) and the superposed bolt rotating groove I (4) and slides left and right along the grooves, the upper height and the lower height of the bolt rotating groove I (4) are equal to the outer diameter of a screw rod of a high-strength bolt (20) penetrating through the groove, the other high-strength bolt (20) is fixed through two nuts (21), and friction gaskets (23) are arranged between the two nuts (21) and the outer side plate walls of the left wing and the right wing of the U-shaped connecting steel plate key.
8. The assembly type concrete beam-column rotatable self-resetting node connection structure as claimed in claim 7, wherein the length of the screw of the high-strength bolt (20) is greater than or equal to the sum of the outer space of the outer side walls of the left and right wings of the U-shaped connecting steel plate key and the thickness of the nut (21), and the outer diameter of the screw of the high-strength bolt (20) is determined by calculation of the shearing force transmitted between prefabricated components.
9. The fabricated concrete beam-column rotatable self-resetting node connection structure according to claim 7, wherein the friction washer (23) is a copper material, and one side of the copper material, which is in key contact with the U-shaped connection steel plate, is roughened to increase frictional resistance.
10. A method of assembling a fabricated concrete beam-column rotatable self-resetting nodal connection according to any one of claims 1 to 9, comprising the steps of:
(1) hoisting the prefabricated reinforced concrete column and the prefabricated reinforced concrete beam to a preset position, slowly moving the prefabricated reinforced concrete beam to enable the outer sides of the two wing plate walls of the E-shaped connecting steel plate key to be inserted into the inner sides of the two wing plate walls of the U-shaped connecting steel plate key in parallel until the bolt hole I (3) and the bolt hole II (12), aligning the bolt rotating groove I (4) and the bolt rotating groove II (13) with each other, enabling the E-shaped connecting steel plate key not to be completely inserted into the U-shaped connecting steel plate key at the moment, and reserving a certain gap between the bolt rotating groove I and the bolt rotating groove II for relative rotation;
(2) guiding a prestressed tendon (25) to sequentially pass through a prestressed tendon pore passage II (19), a prestressed tendon pore passage II (11), a prestressed tendon pore passage I (2) and a prestressed tendon pore passage I (9) and penetrate out of the prefabricated reinforced concrete column, tensioning the prestressed tendon (25) at one side of the prefabricated reinforced concrete beam, and fixing the unbonded prestressed tendon (25) at one side of the prefabricated reinforced concrete column by adopting a prestressed tendon anchorage device (26);
(3) after the unbonded prestressed tendons (25) are tensioned and anchored, friction gaskets (23) are placed on two sides of the center positions of the bolt rotating groove I (4) and the bolt rotating groove II (13), then the high-strength bolts (20) respectively penetrate through the bolt holes I (3), the bolt holes II (12) and the round holes (24) in the friction gaskets (23), the nuts (21) are screwed by using torque wrenches, and the pretightening force applied by the torque wrenches is determined by shear force transmitted between prefabricated components.
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| CN112144943A (en) * | 2020-09-30 | 2020-12-29 | 刘新玲 | Wire pole with safety function of preventing falling |
| CN113047429A (en) * | 2021-03-02 | 2021-06-29 | 青岛理工大学 | Rotation friction energy dissipation type self-resetting assembly type beam-column joint |
| CN113863492A (en) * | 2021-09-17 | 2021-12-31 | 哈尔滨工业大学 | Fabricated concrete beam-column self-resetting node based on friction steel plate connection and assembling method |
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| CN112144943A (en) * | 2020-09-30 | 2020-12-29 | 刘新玲 | Wire pole with safety function of preventing falling |
| CN112144943B (en) * | 2020-09-30 | 2021-10-29 | 湖南双林机械设备有限公司 | Wire pole with safety function of preventing falling |
| CN113047429A (en) * | 2021-03-02 | 2021-06-29 | 青岛理工大学 | Rotation friction energy dissipation type self-resetting assembly type beam-column joint |
| CN113863492A (en) * | 2021-09-17 | 2021-12-31 | 哈尔滨工业大学 | Fabricated concrete beam-column self-resetting node based on friction steel plate connection and assembling method |
| CN113863492B (en) * | 2021-09-17 | 2023-04-11 | 哈尔滨工业大学 | Fabricated concrete beam-column self-resetting node based on friction steel plate connection and assembling method |
| CN115142544A (en) * | 2022-06-29 | 2022-10-04 | 福建江夏学院 | Mortise-tenon joint type assembled concrete frame structure |
| CN115233847A (en) * | 2022-07-16 | 2022-10-25 | 深圳市特区建工科工集团有限公司 | Novel dry connection self-resetting node and manufacturing method thereof |
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