CN115538584A - UHPC (ultra high performance concrete) connected precast concrete frame structure system and design and construction method thereof - Google Patents
UHPC (ultra high performance concrete) connected precast concrete frame structure system and design and construction method thereof Download PDFInfo
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- CN115538584A CN115538584A CN202110734341.1A CN202110734341A CN115538584A CN 115538584 A CN115538584 A CN 115538584A CN 202110734341 A CN202110734341 A CN 202110734341A CN 115538584 A CN115538584 A CN 115538584A
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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
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes 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
- E04B1/21—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
- E04B1/62—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
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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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
- E04H9/025—Structures with concrete columns
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Abstract
The invention discloses a UHPC-connected precast concrete frame structure system which comprises a precast concrete upper column, a precast concrete lower column, a precast concrete superposed beam, a UHPC node core area and a superposed slab. The upper longitudinal main reinforcement extends out of the bottom surface of the prefabricated upper column and is directly anchored in the UHPC node core area, the lower longitudinal main reinforcement extends out of the top surface of the prefabricated lower column and is directly anchored in the UHPC node core area, and the common reinforcement extends out of the end surface of the prefabricated concrete beam and is directly anchored or bent and anchored in the UHPC node core area. The structural system is convenient and quick in site construction, improves the installation efficiency of the components, can greatly reduce the anchoring length of the steel bars, greatly reduces the stirrup using amount in the core area of the node, avoids the crowding of the steel bars in the core area of the node, and improves the anti-seismic performance of the whole frame structure. And the UHPC is used in the node core area, so that the design principle of a strong column, a weak beam and a strong node and a weak member can be really realized.
Description
Technical Field
The invention relates to the technical field of prefabricated building construction, in particular to a UHPC (ultra high performance concrete) connected prefabricated concrete frame structure system and a design and construction method thereof.
Background
The cast-in-place structure has the limitations of low construction efficiency, high energy consumption and the like, and is gradually difficult to adapt to the development requirement of building industrialization. The prefabricated building has become the development direction of building industrialization due to the advantages of high construction speed, factory production of components, reduction of field wet operation, reduction of environmental pollution and the like. Through years of development and popularization, prefabricated concrete structures have been widely researched and used.
The prefabricated assembly type concrete frame structure is a structure that beam column components are prefabricated in a prefabrication factory and transported to a construction site to be connected to form an integral structure. Compared with a cast-in-place concrete structure, the cast-in-place concrete structure has the advantages of high construction speed, easy guarantee of component quality, good quality, small environmental pollution, labor cost saving, large quantity of templates and supports saving and the like, and has a very wide prospect. For a wet connection assembly type concrete frame structure, a node construction form which is easy to construct and effectively ensures integrity is the key for popularization and application. However, from the conventional earthquake disaster, the assembled structure is seriously damaged in the earthquake, and the same earthquake-proof performance as that of the cast-in-place structure is difficult to achieve. In order to improve the integrity and reliability of the joint connection of the prefabricated Concrete frame and achieve or even exceed the seismic Performance of a cast-in-place Concrete structure, an Ultra High Performance Concrete (UHPC) material is introduced into the prefabricated structure.
The UHPC has excellent bonding performance, and can greatly reduce the anchoring length of a steel bar in the UHPC; the strength is high, the stirrup amount in a node core area can be reduced, the UHPC is used in the node core area, the structure is simple, the integrity of a frame is good, the realization of the design principle of strong node weak components and strong column weak beams is ensured, and the plastic hinge at the beam end is ensured to consume energy. And the UHPC is applied to a node core area to form a prefabricated frame structure, and the structure is deeply researched, so that the further popularization and application of the prefabricated concrete frame structure are facilitated.
Disclosure of Invention
The invention aims to provide a UHPC (ultra high performance concrete) connected precast concrete frame structure system and a design and construction method thereof by combining the excellent performance of UHPC (ultra high performance concrete) aiming at the defects in the prior art. The prefabricated concrete frame structure combines two traditional structures of an assembly type structure and a superposition structure, and adopts UHPC high-performance material, thereby achieving the purpose of improving the anti-seismic performance of the prefabricated concrete frame structure.
The invention has the advantages that the invention mainly embodies the connection technology of the precast concrete beam column components and the steel bar connection technology between the components. In the aspect of component connection technology, beam column components are connected through UHPC with excellent performance to form a UHPC node core area, stirrups in the node core area can be greatly reduced, and the requirement of seismic fortification of strong node weak components is more easily realized, so that the ductility of beam column nodes is improved, and the seismic performance of the whole frame structure is improved. In the aspect of the steel bar connection technology, steel bars between beam column components only need to be simply lapped, and the lapping length is very small, so that the manufacturing time and the field installation time of prefabricated components are greatly saved. Therefore, the UHPC-connected precast concrete frame structure system and the construction method thereof provided by the invention accord with the green development strategy of building industrialization in China.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a UHPC-connected precast concrete frame structure system comprises a precast concrete upper column, a precast concrete lower column, a precast concrete superposed beam, a UHPC node core area and a superposed slab;
an upper longitudinal main rib is arranged in the precast concrete upper column, a lower longitudinal main rib is arranged in the precast concrete lower column, a precast concrete beam and a beam superposed layer are arranged in the precast concrete superposed beam, the precast concrete beam is provided with common reinforcing steel bars, a top through long reinforcing steel bar is arranged in the beam superposed layer, and the superposed slab consists of a precast concrete slab and a slab superposed layer poured on the slab;
the upper longitudinal main reinforcement extends out of the bottom surface of the prefabricated upper column and is directly anchored in the UHPC node core area, the lower longitudinal main reinforcement extends out of the top surface of the prefabricated lower column and is directly anchored in the UHPC node core area, and the common reinforcement extends out of the end surface of the prefabricated concrete beam and is directly anchored or bent and anchored in the UHPC node core area;
the precast concrete superposed beam can also be a fully precast concrete beam.
Furthermore, the precast concrete superposed beam consists of a precast concrete beam and a beam superposed layer; the composite slab is composed of a precast concrete slab and a slab lamination layer poured on the slab.
Furthermore, the bottom surface of the precast concrete upper column, the top surface of the precast concrete lower column and the end surface of the precast concrete composite beam are all provided with sunken grooves (the beam end can also be provided with a U-shaped groove, and a structural shear steel bar can be arranged if necessary).
Further, the precast concrete upper column is fixed at a corresponding position by a reliable support.
Furthermore, stirrups in the precast concrete upper column, the precast concrete lower column and the precast concrete superposed beam are divided into an encrypted area and a non-encrypted area, stirrups in a core area of the UHPC node are arranged according to design requirements, the shear resistance bearing capacity of the core area is calculated according to an oblique compression bar and a truss model, steel fibers in the UHPC node are considered to be equivalent to horizontal stirrups and vertical longitudinal reinforcements, and the contribution of the steel fibers to the shear resistance of the node core area is considered.
Further, the top surfaces of the precast concrete beam and the precast concrete slab are provided with rough surface layers.
The invention also provides a design method of the system, which comprises the following steps:
step 1: the beam and the column are designed according to the existing standard and invention patent;
step 2: the seismic design of the node is carried out according to the following method: calculating horizontal shearing bearing capacity V of node jh ；
And step 3: the diameter of the longitudinal reinforcing bar of each beam passing through the center column is preferably no greater than the smaller of 1/18 and x of the cross-sectional dimension of the column in that direction. A UHPC joined precast concrete frame structure system comprising the steps of:
step 1: manufacturing a precast concrete lower column, a precast concrete upper column, a precast concrete beam and a precast concrete slab; wherein, enough anchoring length needs to be reserved in the core area of the anchoring node of the precast concrete lower column and the precast concrete upper column extending out of the longitudinal bar; enough anchoring length needs to be reserved in a core area of an ordinary steel bar anchoring node extending out of the precast concrete beam;
step 2: after the prefabricated part is manufactured, hoisting and installing the prefabricated concrete lower column on the foundation, and then installing a proper number of stirrups on the extended longitudinal main reinforcements;
and 3, step 3: hoisting the precast concrete beam to the top surface of the precast concrete lower column, enabling the bottom surface of the precast concrete beam to be flush with the top surface of the precast concrete lower column, enabling the end part of the precast concrete beam to be placed on the precast concrete lower column, and fixing the precast concrete beam by using a support; the steel bars extending out of the precast concrete beams on the two sides are reasonably avoided in the node core area and are directly anchored;
and 4, step 4: hoisting the precast concrete upper column to be right above the precast concrete lower column, fixing the precast concrete upper column at a corresponding position by using a reliable support, and binding the stirrups installed in the step 2; wherein, the precast concrete upper and lower columns extend out of the steel bars to reasonably avoid the steel bars in the core area of the node and are directly anchored;
and 5: penetrating the top through-length steel bars through stirrups reserved in the superposed layers and a node core area, binding, then pouring a UHPC node core area, and arranging a template to prevent UHPC from entering a Liang Diege layer part;
and 6: hoisting a precast concrete flat plate (or a composite slab, a double-T plate and a secondary beam) to the precast concrete beam and fixing;
and 7: pouring a beam laminated layer and a plate laminated layer;
and 8: and repeating the manufacturing process to finish the precast concrete frame structure system.
Compared with the prior art, the invention has the advantages that:
the UHPC material with excellent performance is adopted and applied to the node core area, so that the reliable anchoring of the prefabricated beam column member can be realized, the bearing capacity and the anti-seismic performance of the node can be improved, the anchoring length of the steel bar can be greatly reduced, and the stirrup dosage in the node core area can be obviously reduced, thereby avoiding the steel bar crowding in the node core area, and greatly improving the manufacturing, transporting and installing efficiency of the prefabricated beam column member. Due to the adoption of the UHPC in the node core area, the frame structure can realize plastic hinge at the beam end for energy consumption in an earthquake, and the design principle of strong node weak components and strong column weak beams is realized.
Drawings
Fig. 1 is a schematic structural view of a UHPC-jointed precast concrete frame structural system of the present invention.
Fig. 2 is a schematic diagram of reinforcement of a two-span frame structure according to the present invention.
Fig. 3 is a schematic view of a two-span frame structure material with one frame.
Fig. 4 is a detailed view of the structure of the edge node of the intermediate layer frame.
FIG. 5 is an isometric view of an edge node of the intermediate layer frame of the present invention.
FIG. 6 is a detailed view of the node configuration in the intermediate layer frame of the present invention.
FIG. 7 is an isometric view of a node in the intermediate layer frame of the present invention.
Detailed Description
So that the manner in which the features, objects, and advantages of the invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1 to 7, the UHPC-connected precast concrete frame structure system according to the present invention includes a precast concrete upper column (1), a precast concrete lower column (2), a precast concrete composite beam (3), a UHPC node core region (4), and a composite slab (5);
an upper longitudinal main rib (6) is arranged in the precast concrete upper column (1), a lower longitudinal main rib (7) is arranged in the precast concrete lower column (2), a precast concrete beam (8) and a beam overlapping layer (9) are arranged in the precast concrete composite beam (3), a common reinforcing steel bar (10) is arranged on the precast concrete beam (8), a top through long reinforcing steel bar (11) is arranged in the beam overlapping layer (9), and the composite slab (5) consists of a precast concrete slab (12) and a slab overlapping layer (13) poured on the slab;
the upper longitudinal main rib (6) extends out of the bottom surface of the prefabricated upper column (1) and is directly anchored in the UHPC node core area (4), the lower longitudinal main rib (7) extends out of the top surface of the prefabricated lower column (2) and is directly anchored in the UHPC node core area (4), and the common steel bar (10) extends out of the end surface of the prefabricated concrete beam (8) and is directly anchored or bent and anchored in the UHPC node core area (4);
the precast concrete superposed beam (3) can also be a fully precast concrete beam; .
The precast concrete superposed beam (3) consists of a precast concrete beam (8) and a beam superposed layer (9); the composite slab (5) is composed of a precast concrete slab (12) and a slab composite layer (13) poured on the slab.
The bottom surface of the precast concrete upper column (1), the top surface of the precast concrete lower column (2) and the end surface of the precast concrete composite beam (3) are provided with sunken grooves (the beam end can also be provided with a U-shaped groove, and structural shear steel bars can be arranged if necessary).
The precast concrete upper column (1) is fixed at a corresponding position by a reliable support (14).
The reinforcement stirrup (15) in the upper precast concrete column (1), the lower precast concrete column (2) and the precast concrete composite beam (3) are divided into a dense region and a non-dense region, the reinforcement stirrup (16) in the UHPC node core region (4) is arranged according to design requirements, the shear resistance bearing capacity of the core region is calculated according to a softened tension-compression bar model, the steel fiber in the UHPC node is considered to be equivalent to a horizontal reinforcement stirrup and a vertical longitudinal bar, and the contribution of the reinforcement stirrup to the shear resistance of the node core region is considered.
And the top surfaces of the precast concrete beam (8) and the precast concrete plate (12) are provided with rough surface layers.
The seismic design of the system comprises the following steps:
step 1: the beam and the column are designed according to the existing standard and invention patent;
step 2: the seismic design of the node is carried out according to the following method: calculating horizontal shearing bearing capacity V of node jh ；
And step 3: the diameter of the longitudinal reinforcing bars of each beam extending through the central column should not be greater than the lesser of 1/18 and x of the cross-sectional dimension of the column in that direction.
A UHPC joined precast concrete frame structure system comprising the steps of:
step 1: manufacturing a precast concrete lower column (2), a precast concrete upper column (1), a precast concrete beam (8) and a precast concrete slab (12); wherein, enough anchoring length is reserved for anchoring the precast concrete lower column (2) and the precast concrete upper column (1) into the node core area (4) by extending out of the longitudinal ribs; enough anchoring length needs to be reserved for anchoring common steel bars extending out of the precast concrete beam (8) into a node core area (4);
step 2: after the prefabricated part is manufactured, hoisting the prefabricated concrete lower column (2) and installing the prefabricated concrete lower column on the foundation, and then installing a proper number of stirrups (16) on the extended longitudinal main reinforcement (7);
and step 3: hoisting the precast concrete beam (8) to the top surface of the precast concrete lower column (2), enabling the bottom surface of the precast concrete beam (8) to be flush with the top surface of the precast concrete lower column (2), enabling the end part of the precast concrete beam (8) to be placed on the precast concrete lower column (2) and fixing the precast concrete beam by using a support; wherein, the reinforcing steel bars (10) extending out of the precast concrete beams (8) at the two sides are reasonably avoided and directly anchored in the node core area;
and 4, step 4: hoisting the precast concrete upper column (1) to be right above the precast concrete lower column (2), fixing the precast concrete upper column (1) at a corresponding position by using a reliable support (14), and binding the stirrups (16) installed in the step 2; wherein, the precast concrete upper and lower columns extend out of the steel bars to reasonably avoid the steel bars in the core area of the node and are directly anchored;
and 5: penetrating and binding the top through long steel bar (11) through a stirrup (15) reserved in the superposed layer and the node core area (4), then pouring the UHPC node core area (4), and setting a template to prevent the UHPC from entering the beam superposed layer (9);
step 6: hoisting a precast concrete flat plate (or a composite slab, a double T plate and a secondary beam) (12) to the precast concrete beam (8) and fixing;
and 7: pouring a beam laminated layer (9) and a plate laminated layer (13);
and 8: and repeating the manufacturing process to complete the precast concrete frame structure system.
The foregoing description is only exemplary of the invention, and it is obvious that the present invention is not limited to the above-described mode, i.e., the description is not restrictive, and the invention can be easily modified, changed or substituted without departing from the method concept and technical solution of the present invention, and the modifications and changes are all within the protection scope of the present invention.
Claims (8)
1. A prefabricated concrete frame structure system connected by UHPC comprises a prefabricated (or cast-in-place) concrete upper column (1), a prefabricated (or cast-in-place) concrete lower column (2), a prefabricated concrete composite beam (3), an UHPC node core area (4) and a composite slab (5);
the composite slab is characterized in that an upper longitudinal main rib (6) is arranged in the precast concrete upper column (1), a lower longitudinal main rib (7) is arranged in the precast concrete lower column (2), a precast concrete beam (8) and a beam overlapping layer (9) are arranged in the precast concrete superposed beam (3), a common steel bar (10) is arranged on the precast concrete beam (8), a top through long steel bar (11) is arranged in the beam overlapping layer (9), and the composite slab (5) consists of a precast concrete slab (12) and a slab overlapping layer (13) poured on the slab;
the novel structural steel column is characterized in that the upper longitudinal main rib (6) extends out of the bottom surface of the prefabricated upper column (1) and is directly anchored in the UHPC node core area (4), the lower longitudinal main rib (7) extends out of the top surface of the prefabricated lower column (2) and is directly anchored in the UHPC node core area (4), and the common steel bar (10) extends out of the end surface of the prefabricated concrete beam (8) and is directly anchored or bent and anchored in the UHPC node core area (4);
the precast concrete composite beam is characterized in that the precast concrete composite beam (3) can also be a fully precast concrete beam.
2. A UHPC connected precast concrete frame structure system according to claim 1, wherein the precast concrete composite beam (3) is composed of a precast concrete beam (8) and a beam composite layer (9); the composite slab (5) is composed of a precast concrete slab (12) and a slab composite layer (13) poured on the slab.
3. A UHPC-jointed precast concrete frame structure system according to claim 1, wherein the bottom surface of the precast concrete upper column (1), the top surface of the precast concrete lower column (2), and the end surface of the precast concrete composite girder (3) are provided with recessed grooves (the girder end may be provided with U-shaped grooves, and if necessary, construction shear bars may be provided).
4. A UHPC-jointed precast concrete frame structure system according to claim 1, wherein the precast concrete upper column (1) is fixed in a corresponding position with a reliable support (14).
5. The UHPC-connected precast concrete frame structure system according to claim 1, wherein stirrups (15) in the precast concrete upper column (1), the precast concrete lower column (2) and the precast concrete composite beam (3) are divided into a dense area and a non-dense area, stirrups (16) in a UHPC node core area (4) are arranged according to design requirements, the shear resistance of the core area is calculated according to an oblique compression bar and a truss model, and the steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal bars, and the contribution of the horizontal stirrups and the vertical longitudinal bars to the shear resistance of the node core area is considered.
6. A UHPC connected precast concrete frame structure system according to claim 1, characterized in that the precast concrete beam (8) and the top surface of the precast concrete plate (12) are provided with a rough surface layer.
7. A method of designing a UHPC joined precast concrete frame structure system according to claim 1, wherein: except that the beam and the column are designed according to the existing specifications and invention patents, the earthquake-resistant design of the node is carried out according to the following method:
(a) The shear-resistant bearing capacity of the frame beam-column joint should meet the following regulations:
V jh ＝V sh +V ch +V fh
V sh ＝α·A sjh ·f yj
V fh ＝ηλ f h b b c
in the formula: a. The sjh Area of stirrup in core region of node
f yj Design value of yield strength of stirrup in node core area
b j -effective width of node
h c Height of column
A sb Sum of areas of longitudinal bars at top and bottom of beam
b b Width of beam
h b -beam height
f c Design value of concrete axial compressive strength
Eta-effective coefficient of UHPC steel fiber
l-UHPC Steel fiber Length
d-fiber diameter of UHPC Steel
V f Fiber volume content of UHPC Steel
(b) And at the middle node of the middle layer of the frame, the upper longitudinal steel bar of the frame beam should penetrate through the middle node. The diameter of the longitudinal reinforcing steel bar of each beam penetrating through the central column is not suitable to be larger than the smaller value of 1/18 and x of the section size of the column in the direction when the column has a rectangular section for the first, second and third grade earthquake resistance grades. x is calculated according to the following formula:
in the formula: f. of y The design value of the yield strength of the beam longitudinal bar penetrating through the center pillar is obtained.
8. A UHPC joined precast concrete frame structure system comprising the steps of:
step 1: manufacturing a precast concrete lower column (2), a precast concrete upper column (1), a precast concrete beam (8) and a precast concrete slab (12); wherein, enough anchoring length is reserved for anchoring the precast concrete lower column (2) and the precast concrete upper column (1) into the node core area (4) by extending out of the longitudinal ribs; enough anchoring length needs to be reserved for anchoring common steel bars extending out of the precast concrete beam (8) into the node core area (4);
and 2, step: after the prefabricated part is manufactured, hoisting the prefabricated concrete lower column (2) and installing the prefabricated concrete lower column on the foundation, and then installing a proper number of stirrups (16) on the extended longitudinal main reinforcement (7);
and step 3: hoisting the precast concrete beam (8) to the top surface of the precast concrete lower column (2), enabling the bottom surface of the precast concrete beam (8) to be flush with the top surface of the precast concrete lower column (2), enabling the end part of the precast concrete beam (8) to be placed on the precast concrete lower column (2), and fixing the precast concrete beam by using a simple support; wherein, the reinforcing steel bars (10) extending out of the precast concrete beams (8) at the two sides are reasonably avoided and directly anchored in the node core area;
and 4, step 4: hoisting the precast concrete upper column (1) to be right above the precast concrete lower column (2), fixing the precast concrete upper column (1) at a corresponding position by using a reliable support (14), and binding the stirrups (16) installed in the step 2; wherein, the precast concrete upper and lower columns extend out of the steel bars to reasonably avoid the steel bars in the core area of the node and are directly anchored;
and 5: penetrating and binding the top through long steel bar (11) through a stirrup (15) reserved in the superposed layer and the node core area (4), then pouring the UHPC node core area (4), and setting a template to prevent the UHPC from entering the beam superposed layer (9);
step 6: hoisting a precast concrete flat plate (or a composite slab, a double T plate and a secondary beam) (12) to the precast concrete beam (8) and fixing;
and 7: pouring a beam laminated layer (9) and a plate laminated layer (13);
and 8: and repeating the manufacturing process to finish the precast concrete frame structure system.
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| CN116290079A (en) * | 2023-02-15 | 2023-06-23 | 中铁二院工程集团有限责任公司 | Prefabricated retaining wall, side prefabricated block, middle prefabricated block and hole-opening construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116290079A (en) * | 2023-02-15 | 2023-06-23 | 中铁二院工程集团有限责任公司 | Prefabricated retaining wall, side prefabricated block, middle prefabricated block and hole-opening construction method thereof |
| CN116290079B (en) * | 2023-02-15 | 2024-06-11 | 中铁二院工程集团有限责任公司 | Prefabricated retaining wall, side prefabricated block, middle prefabricated block and hole-opening construction method thereof |
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