CN220451073U - UHPC connected rear Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system - Google Patents

Abstract

The utility model discloses a UHPC (ultra high pressure) connected rear Zhang Huan bonded co-tensioned pre-stressed concrete frame structure system which comprises a pre-cast concrete upper column, a pre-cast concrete lower column, a rear Zhang Huan bonded co-tensioned pre-stressed concrete superposed beam, a UHPC node core area and a superposed plate. The upper longitudinal main ribs extend out of the bottom surface of the prefabricated upper column and are directly anchored in the UHPC node core area, the lower longitudinal main ribs extend out of the top surface of the prefabricated lower column and are directly anchored in the UHPC node core area, and the common reinforcing steel bars and the pretensioned prestressed ribs extend out of the end surface of the prefabricated pretensioned prestressed concrete beam and are directly anchored in the UHPC node core area. The structure system is convenient and quick to construct on site, improves the installation efficiency of the components, can greatly reduce the anchoring length of the reinforcing steel bars, greatly reduces the amount of stirrups in the core area of the node, avoids crowding of the reinforcing steel bars in the core area of the node, reduces the section height of the components, lightens the dead weight, and improves the cracking resistance and the self-recovery performance of the components, thereby improving the anti-seismic performance of the whole frame structure.

Description

UHPC connected rear Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system

Technical Field

The utility model relates to the technical field of prefabricated prestressed assembled building construction, in particular to a UHPC (ultra high performance concrete) connected rear Zhang Huan bonded co-tensioned prefabricated prestressed concrete frame structure system.

Background

The cast-in-situ structure has the defects of low construction efficiency, high energy consumption and the like, and is difficult to adapt to the development requirements of building industrialization. The prefabricated building has become the development direction of building industrialization due to the advantages of high construction speed, industrialized production of components, field wet operation reduction, environmental pollution reduction and the like. Through years of development and popularization, prefabricated assembled concrete structures have been widely studied and used.

The prefabricated assembled concrete frame structure refers to 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 the cast-in-place concrete structure, the cast-in-place concrete structure has the advantages of high construction speed, easily guaranteed component quality, good quality, small environmental pollution, labor cost saving, a large number of templates and supports saving and the like, and is a structure form with very broad prospects. For the wet connection assembly type concrete frame structure, the node construction form which is easy to construct and effectively ensures the integrity is key to popularization and application. However, from the view of the past earthquake disasters, the assembled structure is seriously damaged in the earthquake, and the same earthquake-resistant performance as that of the cast-in-situ structure is difficult to achieve. In order to improve the integrity and reliability of the node connection of the fabricated concrete frame and achieve and even exceed the earthquake-resistant performance of the cast-in-place concrete structure, a pre-stress technology and UHPC (Ultra High Performance Concrete, ultra-high performance concrete) material are introduced into the fabricated structure.

The rear Zhang Huan bonded co-tensile prestressed assembled concrete structure is formed by splicing and jointly working a prefabricated common concrete component and a prefabricated pretensioned prestressed component through tensioning prestressed tendons, the structure has the characteristics of pretensioned prestressing, rear Zhang Huan bonded prestressed concrete structure and assembled structure. The internal stress generated by the prestress on the concrete section can partially or completely offset the section stress under the load, delay the occurrence of cracks and improve the rigidity of the component. During unloading, the crack can be partially or completely closed, and the elastic recovery performance of the structure is good. Meanwhile, the prestressed concrete can fully utilize the material strength of the prestressed tendons and the concrete, and lighten the dead weight of the structure. And the application of the prestress is beneficial to the improvement of the usability and the integrity of the assembled structure, and the application of the assembled structure in a large-span and heavy-load structure is promoted.

UHPC has excellent bonding performance, and can greatly reduce the anchoring length of the steel bars and the steel strands in the UHPC; the strength is high, the hooping consumption of the node core area can be reduced, and the UHPC is used for the node core area, so that the structure is simple and the frame integrity is good. The pre-stress structure has excellent stress performance, and UHPC is applied to the node core area to form the pre-stress frame structure. The structure is subjected to intensive research, and is favorable for further popularization and application of the prefabricated prestressed concrete frame structure.

Disclosure of Invention

Aiming at the defects existing in the prior art and combining the excellent performance of UHPC, the utility model provides a UHPC-connected post Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system. The structure combines the three traditional structures of pretensioned prestressing, rear Zhang Huan bonding prestressing structure, assembly structure and superposition structure, and adopts UHPC high-performance materials, thereby achieving the purpose of improving the earthquake resistance of the prefabricated assembly type concrete frame structure.

The utility model has the advantages of mainly representing the two aspects of the connection technology of the precast pre-tensioned prestressed 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, a UHPC node core area is formed, and the anti-seismic fortification requirements of strong-node weak components are more easily realized, so that the ductility of beam column nodes is improved, and the anti-seismic performance of the whole frame structure is improved. In the aspect of the steel bar connection technology, the steel bars between the beam column components only need simple lap joint, and the lap joint length is small, so that the manufacturing time and the field installation time of the prefabricated components are greatly saved. Therefore, the UHPC-connected rear Zhang Huan-bonded co-tensioned precast prestressed concrete frame structure system provided by the utility model accords with the green development strategy of building industrialization in China.

The technical problems solved by the utility model can be realized by adopting the following technical scheme:

the UHPC connected rear Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system comprises a precast concrete upper column, a precast concrete lower column, a rear Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam, a UHPC node core area and a superposed plate;

the precast concrete upper column is internally provided with an upper longitudinal main rib, the precast concrete lower column is internally provided with a lower longitudinal main rib, the rear Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam is internally provided with a precast pre-tensioned prestressed concrete beam, a beam superposed layer and a rear Zhang Huan bonded prestressed rib, the precast pre-tensioned prestressed concrete beam is provided with common reinforcing steel bars and pre-tensioned prestressed ribs, the beam superposed layer is internally provided with a top through length reinforcing steel bar, and the superposed plate consists of a precast concrete slab and a plate superposed layer poured on the plate.

The upper longitudinal main ribs extend out of the bottom surface of the prefabricated upper column and are directly anchored in the UHPC node core area, the lower longitudinal main ribs extend out of the top surface of the prefabricated lower column and are directly anchored in the UHPC node core area, and the common reinforcing steel bars and the pretensioned prestressed ribs extend out of the end surface of the prefabricated pretensioned prestressed concrete beam and are directly anchored in the UHPC node core area.

The pre-tensioning prestressed tendons comprise straight lines or broken line-shaped tendons, and the rear Zhang Huan bonded prestressed tendons comprise straight lines, broken lines and curved tendons;

the rear Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam can also be a fully precast prestressed beam;

the rear Zhang Huan bonded prestressed tendons can be bonded, partially bonded and unbonded in the node core area;

the post Zhang Huan bonded co-tensioned pre-stressed concrete laminated beam is subjected to construction checking calculation according to the pre-tensioned pre-stressed concrete simply supported beam before a beam laminated layer, a plate laminated layer and a UHPC node core area are poured, and after the node core area, the beam laminated layer and the plate laminated layer are poured, when the concrete strength of the node and the laminated layer meets the design requirement, the pre-tensioned pre-stressed tendons are tensioned, and after the tensioning is completed, the construction stage checking calculation is carried out according to the frame beam; after the prestress of the rear Zhang Huan bonded prestressed tendons is established, effective prestress calculation is carried out in construction checking calculation, bonding and unbonded are carried out on the core area parts of the joints, calculation is carried out according to the effective prestress in a normal use limit state, and stress increment of unbonded tendons is considered in a limit bearing limit state; under seismic loading, the recovery performance provided by the unbonded tendons is considered.

Further, the post Zhang Huan bonded co-tensioned pre-stressed concrete composite beam consists of a pre-tensioned pre-stressed concrete beam, a beam composite layer and a post Zhang Huan bonded pre-stressed rib.

Furthermore, the rear Zhang Huan bonded prestressed tendons are pre-buried in the pre-fabricated prestressed concrete beam member according to the designed position, penetrate through the UHPC node core area, extend out of the UHPC node core area from both ends, are fixedly provided with clamps and anchors respectively, one end of each of the clamps and anchors is arranged on the outer side of the column, and the other end of each of the clamps and anchors is arranged in the beam overlapping layer.

Further, the bottom surface of the precast concrete upper column, the top surface of the precast concrete lower column and the end surface of the post Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam are all provided with recessed grooves (U-shaped grooves can be formed at the beam ends, and structural shear steel bars can be arranged if necessary).

Further, the precast concrete upper column is fixed at the corresponding position by a reliable support.

Further, stirrups in the co-tensioned precast prestressed concrete superposed beam bonded by the upper precast concrete column, the lower precast concrete column and the rear Zhang Huan are divided into an encryption area and a non-encryption area, stirrups in a UHPC node core area are arranged according to design requirements, shear bearing capacity calculation in the core area is calculated according to a diagonal compression bar model, steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal ribs, contribution of the steel fibers to the shear resistance of the node core area is considered, and beneficial contribution of the slow bonding prestressed ribs to the shear resistance of the node is considered.

Further, the top surfaces of the precast pretensioned prestressed concrete beam and the precast concrete slab are provided with a fur layer.

Compared with the prior art, the utility model has the advantages that:

1. the utility model combines the prefabricated concrete structure, the pretensioned prestressing structure and the rear Zhang Huan bonding prestressing structure together, and on the basis of the advantages of convenient and quick construction, good construction quality, energy conservation and environmental protection of the prefabricated structure, the combined rear Zhang Huan bonding co-tensioned prestressing structure can improve the service performance of the structure, reduce the section height of the component, lighten the dead weight, improve the cracking resistance of the component and the self-recovery, thereby improving the anti-seismic performance of the integral frame structure. The pretension prestressing can realize the construction of few support or no support of the precast beam, and the rear Zhang Huan bonding rib has good durability and convenient construction, and solves the problem that the post-tensioned bonding grouting is not compact.

2. The UHPC material with excellent performance is adopted and applied to the node core area, so that the reliable connection of the precast beam column components can be realized, the bearing capacity and the anti-seismic performance of the node can be improved, the anchoring length of the steel bars and the steel strands can be greatly reduced, the amount of stirrups in the node core area can be remarkably reduced, the crowding of the steel bars in the node core area is avoided, and the manufacturing, transporting and installing efficiency of the precast beam column components is greatly improved.

Drawings

FIG. 1 is a schematic structural diagram of a UHPC-based precast prestressed concrete frame structure system of the present utility model

FIG. 2 is a schematic view of a two-span frame structure of the present utility model

FIG. 3 is a schematic view of a two-truss frame construction material according to the present utility model

FIG. 4 is a detailed view of the intermediate layer frame edge node construction of the present utility model

FIG. 5 is an isometric view of an intermediate layer frame edge node of the present utility model

FIG. 6 is a detailed view of the construction of nodes in the intermediate layer frame of the present utility model

FIG. 7 is an isometric view of a node in the middle layer frame of the present utility model

Detailed Description

So that the manner in which the features, objects, and advantages of the utility model can be better understood, a more particular description of the utility model, briefly summarized below, may be had by reference to the appended drawings.

As shown in fig. 1-7, the rear Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system for UHPC connection comprises a precast concrete upper column 1, a precast concrete lower column 2, a rear Zhang Huan bonded co-tensioned precast prestressed concrete composite beam 3, a UHPC node core region 4 and a composite slab 18;

the precast concrete upper column 1 is internally provided with an upper longitudinal main rib 5, the precast concrete lower column 2 is internally provided with a lower longitudinal main rib 6, the rear Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam 3 is internally provided with a precast pre-tensioned prestressed concrete beam 7, a beam superposed layer 8 and a rear Zhang Huan bonded prestressed rib 9, the precast pre-tensioned prestressed concrete beam 7 is provided with a common reinforcing steel bar 10 and a pre-tensioned prestressed rib 17, the beam superposed layer 8 is internally provided with a top through length reinforcing steel bar 11, and the superposed plate 18 consists of a precast concrete slab 19 and a plate superposed layer 20 poured on the plate.

The upper longitudinal main ribs 5 extend out of the bottom surface of the precast concrete upper column 1 and are directly anchored in the UHPC node core area 4, the lower longitudinal main ribs 6 extend out of the top surface of the precast concrete lower column 2 and are directly anchored in the UHPC node core area 4, and the common reinforcing steel bars 10 and the pretensioning prestressed ribs 17 extend out of the end surface of the precast pretensioned prestressed concrete beam 7 and are directly anchored in the UHPC node core area 4.

The pretensioned prestressing tendons 17 comprise straight lines or broken line-shaped tendons, and the rear Zhang Huan bonded prestressing tendons 9 comprise straight lines, broken lines and curved tendons;

the rear Zhang Huan bonded prestressed tendons 9 can be bonded, partially bonded and unbonded in the node core area;

the post Zhang Huan bonded co-tensioned precast prestressed concrete composite beam 3 is subjected to construction checking calculation according to a pre-tensioned prestressed concrete simply supported beam before a beam composite layer 8, a plate composite layer 20 and a UHPC node core region 4 are poured, and after the node core region 4, the beam composite layer 8 and the plate composite layer 20 are poured, when the concrete strength of the node and the composite layer meets the design requirement, the tensioning of the slow-bonded prestressed tendons 9 is carried out, and after the tensioning is finished, the construction phase checking calculation is carried out according to the frame beam; after the prestress is established, the effective prestress is calculated in the construction checking calculation of the rear Zhang Huan binding prestress 9, binding and unbinding are carried out on the core area part of the node, the effective prestress is calculated in the normal use limit state, and the stress increment of the unbonded tendon is considered in the limit bearing limit state; under seismic loading, the recovery performance provided by the unbonded tendons is considered.

The rear Zhang Huan bonded co-tensioned pre-stressed concrete composite beam 3 consists of a pre-tensioned pre-stressed concrete beam 7, a beam composite layer 8 and rear Zhang Huan bonded pre-stressed tendons 9; the superimposed sheet 18 consists of precast concrete panels 19 and a sheet laminate 20 cast onto the panels.

The rear Zhang Huan bonded prestressed tendons 9 are pre-buried in the prefabricated pretensioned prestressed concrete beam 7 component according to the design position, penetrate through the UHPC node core area 4, extend out of the UHPC node core area 4 at two ends, are fixedly provided with a clamp 15 and an anchor 16 respectively, one end is arranged on the outer side of the column, and the other end is arranged in the beam overlapping layer.

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 rear Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam 3 are all provided with inward concave grooves.

The precast concrete upper column 1 is fixed at a corresponding position by a reliable support 12.

The non-encrypted stirrups 13 in the co-tensioned precast prestressed concrete superposed beam 3 bonded by the precast concrete upper column 1, the precast concrete lower column 2 and the rear Zhang Huan are divided into an encrypted area and a non-encrypted area, the encrypted stirrups 14 in the UHPC node core area 4 are arranged according to design requirements, the shearing resistance bearing capacity of the core area is calculated according to an oblique compression bar model, the steel fibers in the UHPC are equivalent to horizontal stirrups and vertical longitudinal ribs, the contribution of the steel fibers to the shearing resistance of the node core area is considered, and the shearing resistance beneficial contribution of the slow-bonded prestressed ribs to the node is considered.

The top surfaces of the precast pretensioned prestressed concrete beam 7 and the precast concrete slab 19 are provided with a fur layer.

A UHPC-bonded rear Zhang Huan co-tensioned precast prestressed 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 pretensioned prestressed concrete beam 7 and a precast concrete slab 19; the prefabricated concrete lower column 2 and the prefabricated concrete upper column 1 extend out of the longitudinal ribs and are anchored into the node core area 4, and enough anchoring length is reserved; when the pretensioned prestressed concrete beam 7 is prefabricated, pretensioned prestressed tendons 17 are pretensioned on a pedestal, the rear Zhang Huan bonded prestressed tendons 9 are pre-buried in the beam according to the design position, enough lengths are reserved on two sides, then concrete is poured, zhang Xianzhang prestressed tendons 17 are placed when the concrete is cured to enough strength, and enough anchoring lengths are reserved at the beam ends;

step 2: after the prefabricated part is maintained, hoisting the precast concrete lower column 2 and installing the precast concrete lower column on a foundation, and then installing a proper number of encryption stirrups 14 on the extended longitudinal main ribs 6;

step 3: hoisting the precast pretensioned prestressed concrete beam 7 to the top surface of the precast concrete lower column 2, enabling the bottom surface of the precast pretensioned prestressed concrete beam 7 to be flush with the top surface of the precast concrete lower column 2, enabling the end part of the precast pretensioned prestressed concrete beam 7 to be put on the precast concrete lower column 2 and fixed by a support, and avoiding the support due to the pretensioned prestressing effect in the beam; the common steel bars 10 and the pretensioned prestressed tendons 17 which extend from the pretensioned prestressed concrete beams 7 at the two sides are reasonably avoided and directly anchored or bent and anchored in a node core area according to the construction requirement;

step 4: hoisting the precast concrete upper column 1 to the position right above the precast concrete lower column 2, fixing the precast concrete upper column 1 at a corresponding position by using a reliable support 12, and binding the encrypted stirrups 14 installed in the step 2 with column longitudinal ribs; wherein, longitudinal ribs extending from the upper and lower columns of the precast concrete are reasonably avoided in a node core area and directly anchored;

step 5: the top through-length reinforcing steel bars 11 penetrate through non-encryption stirrups 13 reserved in the beam overlapping layer area and the node core area 4 and are bound, then the slow-bonding prestressed tendons 9 which are pre-embedded in the pretensioned prestressed concrete beam 7 and extend out are bound in the node core area according to the design position, a non-bonding part of the node is required to be sleeved on the slow-bonding tendons, then the UHPC node core area 4 is poured, and a template is arranged so that the UHPC cannot enter the beam overlapping layer 8;

step 6: after the UHPC node core area 4 is cured to be of sufficient strength, hoisting the precast concrete slab 19 onto the precast prestressed concrete beam 7, and fixing;

step 7: pouring a beam lamination layer 8 and a plate lamination layer 20;

step 8: after curing the beam lamination 8 and slab lamination 20 concrete to a sufficient strength, tensioning the slow-bonding prestressed tendons 9;

step 9: repeating the manufacturing process to finish the post-tensioning and slow-bonding co-tensioning precast prestressed concrete frame structure system.

While the utility model has been described above by way of example only, it will be apparent that the utility model is not limited to the particular embodiments described, i.e., it is not limited thereto, but is susceptible to various modifications, changes or substitutions without departing from the spirit and scope of the present utility model.

Claims (7)

1. The UHPC connected rear Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system comprises a precast concrete upper column (1), a precast concrete lower column (2), a rear Zhang Huan bonded co-tensioned precast prestressed concrete superposed beam (3), a UHPC node core area (4) and a superposed plate (18);

the concrete pile is characterized in that an upper longitudinal main rib (5) is arranged in a precast concrete upper column (1), a lower longitudinal main rib (6) is arranged in a precast concrete lower column (2), a precast pretensioned prestressed concrete beam (7), a beam superposition layer (8) and a rear Zhang Huan binding prestressed rib (9) are arranged in a rear Zhang Huan binding co-tensioned precast prestressed concrete superposition beam (3), the precast prestressed concrete beam (7) is provided with a common reinforcing steel bar (10) and a pretensioned prestressed rib (17), a top through length reinforcing steel bar (11) is arranged in the beam superposition layer (8), and a superposition plate (18) consists of a precast concrete slab (19) and a plate superposition layer (20) poured on the slab;

the upper longitudinal main ribs (5) extend out of the bottom surface of the precast concrete upper column (1) and are directly anchored in the UHPC node core area (4), the lower longitudinal main ribs (6) extend out of the top surface of the precast concrete lower column (2) and are directly anchored in the UHPC node core area (4), and the common reinforcing steel bars (10) and the pretensioning prestressed ribs (17) extend out of the end surface of the precast pretensioning prestressed concrete beam (7) and are directly anchored in the UHPC node core area (4);

the pretensioning prestressed tendons (17) comprise straight lines or broken line-shaped tendons, and the rear Zhang Huan bonded prestressed tendons (9) comprise straight lines, broken lines and curved tendons;

and after the UHPC node core area (4), the beam laminated layer (8) and the plate laminated layer (20) are poured, tensioning the post-tensioning slow-bonding prestressed tendons (9) when the concrete strength of the node and the laminated layer reaches the design requirement.

2. The UHPC-connected post Zhang Huan bonded co-tensioned pre-stressed concrete frame structure system of claim 1 wherein the post Zhang Huan bonded co-tensioned pre-stressed concrete composite beam (3) consists of pre-tensioned pre-stressed concrete beams (7), beam composite layers (8) and post Zhang Huan bonded pre-stressed tendons (9); the laminated slab (18) consists of a precast concrete slab (19) and a slab laminate (20) poured onto the slab.

3. The post Zhang Huan bonded co-tensioned prestressed concrete frame structure of a UHPC joint according to claim 1, wherein the post Zhang Huan bonded prestressed tendons (9) are embedded in the pre-tensioned prestressed concrete beam (7) member according to the design position, and pass through the UHPC node core region (4) with both ends extending out of the UHPC node core region (4), and are fixedly provided with clamps (15) and anchors (16) at both ends, respectively, one end being arranged outside the column and one end being arranged in the beam lamination layer.

4. The UHPC-connected rear Zhang Huan bonded co-tensioned precast prestressed concrete frame structure system of 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 rear Zhang Huan bonded co-tensioned precast prestressed concrete composite beam (3) are provided with recessed grooves.

5. The UHPC-connected rear Zhang Huan-bonded co-tensioned precast prestressed concrete frame structure system of claim 1, characterized in that the precast concrete upper column (1) is fixed in the corresponding position with a reliable support (12).

6. The UHPC-connected post Zhang Huan bonded co-tensioned pre-tensioned concrete frame construction system of claim 1 wherein the pre-tensioned concrete composite beams (3) with pre-tensioned concrete upper columns (1), pre-tensioned concrete lower columns (2) and post Zhang Huan bonded non-encrypted stirrups (13) are arranged according to design requirements and the encrypted stirrups (14) in the UHPC node core area (4).

7. The UHPC-joined rear Zhang Huan bonded co-tensioned pre-stressed concrete frame structure system of claim 1 wherein the top surfaces of the pre-tensioned pre-stressed concrete beams (7) and the precast concrete panels (19) are provided with a wool top layer.