阅读说明：本技术 一种既有结构外设预应力装配式混凝土框架-耗能支撑加固的结构 (External prestress assembly type concrete frame-energy dissipation support reinforcing structure of existing structure ) 是由 曹徐阳 吴刚 于 2019-10-22 设计创作，主要内容包括：本发明公开了一种既有结构外设预应力装配式混凝土框架-耗能支撑加固的结构,包括固定在待加固的原结构上的外附框架-耗能支撑结构,其包括预制梁、预制柱、预制支撑,预制支撑由内置的低屈服点耗能钢板浇筑混凝土预制而成,所述预制梁、预制柱、预制支撑上均预留有连接用的连接件；预制梁与预制柱相互固定连接,连接节点处后浇混凝土,依次固定连接的预制柱内设有贯穿的预应力筋,预应力筋的两端锚固；所述外附框架由若干外附框架单元构成,外附框架单元中设有预制支撑。本发明在不影响待加固原结构使用的情况下,大幅提高施工效率及加固质量。(The invention discloses a structure for reinforcing an external prestressed assembly type concrete frame-energy dissipation support of an existing structure, which comprises an external frame-energy dissipation support structure fixed on an original structure to be reinforced, and comprises a precast beam, a precast column and a precast support, wherein the precast support is precast by built-in low-yield-point energy dissipation steel plate cast concrete, and connecting pieces for connection are reserved on the precast beam, the precast column and the precast support; the precast beam and the precast column are fixedly connected with each other, concrete is poured behind the connecting node, the precast column which is fixedly connected in sequence is internally provided with a through prestressed tendon, and two ends of the prestressed tendon are anchored; the external frame is composed of a plurality of external frame units, and the external frame units are internally provided with prefabricated supports. The invention greatly improves the construction efficiency and the reinforcement quality under the condition of not influencing the use of the original structure to be reinforced.)

1. The utility model provides an existing structure peripheral hardware prestressing force assembled concrete frame-reinforced structure of power consumption support which characterized in that: comprises an external frame-energy consumption supporting structure (2) fixed on an original structure (1) to be reinforced; the external frame-energy dissipation support structure (2) comprises a precast beam (3), a precast column (4) and a precast support (5), the precast beam (3) is precast by pouring concrete through a built-in steel plate (7), the precast column (4) is precast by pouring concrete through a built-in steel pipe-steel plate assembly (23), the precast support (5) is precast by pouring concrete through a built-in low-yield-point energy dissipation steel plate (15), and connecting pieces for connection are reserved on the precast beam (3), the precast column (4) and the precast support (5);

the precast beam (3) and the precast column (4) are fixedly connected with each other, and concrete is poured at the connecting node to form an external frame of an external frame-energy dissipation supporting structure; the external frame is composed of a plurality of external frame units, adjacent external frame units share a precast beam (3) or a precast column (4), a penetrating prestressed tendon (6) is arranged in the precast column (4) which is fixedly connected in sequence, and two ends of the prestressed tendon (6) are anchored;

prefabricated supports (5) are symmetrically arranged in the external frame units, and the prefabricated supports (5) are obliquely arranged and fixedly connected with connecting pieces reserved on the prefabricated beams (3) and the prefabricated columns (4); one end of the prefabricated support (5) is fixedly connected with the prefabricated beam (3) and the prefabricated column (4), and the other end of the prefabricated support is fixed on the prefabricated beam (3) on the other side.

2. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: the cross section of the low-yield-point energy-consumption steel plate (15) is in a cross shape.

3. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: built-in stirrups (9) and construction steel bars (11) are arranged on built-in steel plates (7) of the precast beams (3), and built-in stirrups (9) and construction steel bars (11) are arranged on steel pipe-steel plate assemblies (23) of the precast columns (4).

4. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: and an additional stirrup (10) is arranged at the joint of the adjacent precast beam (3) and the precast column (4), and the additional stirrup (10) is arranged at the joint of the adjacent precast column (4).

5. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: each externally attached frame unit is provided with two prefabricated supports (5).

6. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: one end of the prefabricated support (5) is fixedly connected with a node connected with the prefabricated beam (3) and the prefabricated column (4), and the other end of the prefabricated support is fixed in the middle of the prefabricated beam (3).

7. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: the prestressed tendons (6) penetrate through steel pipes in the built-in steel pipe-steel plate assembly (23) of the prefabricated column (4) and are unbonded.

8. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: and the connecting pieces between the adjacent prefabricated columns (4) are fixedly connected by welding and fasteners.

9. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: the prefabricated beam (3) and/or the prefabricated column (4) are/is fixedly provided with a connecting component for connecting with the original structure (1); and after the external frame-energy dissipation supporting structure is fixedly connected with the original structure (1) by adopting the connecting component, concrete is poured at the connecting part.

10. The existing structure peripheral prestressed fabricated concrete frame-dissipative support reinforced structure as claimed in claim 1, wherein: the low-yield-point energy-consumption steel plate (15) is partially unbonded with the concrete poured outside.

Technical Field

The invention relates to a civil engineering anti-seismic reinforcing structure, in particular to a structure reinforced by an external prestressed assembly type concrete frame-energy dissipation support of an existing structure.

Background

The additional overall substructure is integrally reinforced, namely the structure system of the original structure is changed by utilizing the cooperative work of the additional overall substructure and the original structure, and the damage is transferred to the additional substructure, so that the stress state and the deformation mode of the original structure are changed, the overall shock resistance of the structure is enhanced, the overall shock resistance requirement is reduced, and the method is a reinforcing method of the structure system.

The existing reinforcing methods are mostly limited to the reinforcement of the component level, such as enlarging the section of the component, externally attaching steel plates, etc., and the existing technology tends to reinforce the component with insufficient shock resistance in the original structure rather than considering the shock resistance of the whole structure.

In addition, most of the existing additional substructure reinforcement needs cast-in-place operation, the construction period is complicated and long, the construction quality is difficult to guarantee, and the original advantages are lost to a certain extent. Most of the existing additional substructures are external frames, and the external frames are adopted, namely, fewer supports are adopted; the existing external attaching-supporting researches are mostly steel structures, and the forms of steel-concrete combination are less.

Disclosure of Invention

The purpose of the invention is as follows: in order to solve the defects in the prior art, the invention provides the structure for reinforcing the external prestressed assembly type concrete frame-energy dissipation support of the existing structure, and the construction efficiency and the reinforcing quality are greatly improved under the condition of not influencing the use of the original structure to be reinforced.

The technical scheme is as follows: the invention relates to a structure for externally arranging a prestress assembly type concrete frame-energy dissipation support reinforcement on an existing structure, which comprises an externally-attached frame-energy dissipation support structure fixed on an original structure to be reinforced; the external frame-energy dissipation support structure comprises a precast beam, a precast column and a precast support, wherein the precast beam is precast by built-in steel plate cast concrete, the precast column is precast by built-in steel pipe-steel plate assembly cast concrete, the precast support is precast by built-in low yield point energy dissipation steel plate cast concrete, and connecting pieces for connection are reserved on the precast beam, the precast column and the precast support;

the prefabricated beam and the prefabricated column are fixedly connected with each other, and concrete is poured at the connecting node to form an external frame of the external frame-energy dissipation supporting structure; the external frame is composed of a plurality of external frame units, adjacent external frame units share a precast beam or a precast column, a penetrating prestressed tendon is arranged in the precast column which is fixedly connected in sequence, and two ends of the prestressed tendon are anchored; prefabricated supports are symmetrically arranged in the external frame units, are obliquely arranged and are fixedly connected with connecting pieces reserved on the prefabricated beams and the prefabricated columns; one end of the prefabricated support is fixedly connected with a node connected with the prefabricated beam and the prefabricated column, and the other end of the prefabricated support is fixed on the prefabricated beam on the other side.

Wherein, the low yield point energy consumption steel plate can be Q235; the external frame is composed of a plurality of external frame units, the number of the external frame units can be increased or decreased in a targeted manner according to the actual original structure to be reinforced when the external frame is used, and adjacent external frame units share one precast beam or precast column; the cross section of the energy-consuming low-yield-point steel can be in a straight line shape, a cross shape or a meter shape; connecting pieces reserved for connection on the precast beams, the precast columns and the precast supports are arranged according to an actual connection mode, if two precast supports are symmetrically arranged in the external frame unit, two oblique steel plates are reserved on the corresponding upper precast beam and are respectively connected with the precast supports; the connecting piece can adopt a form of an overhanging connecting steel plate, and then a fastening piece is arranged to realize tight combination; the external frame-energy consumption supporting structure is combined with the original structure to be reinforced through the connecting component; the external prestressed assembly type concrete frame-energy dissipation support reinforced structure of the existing structure can be mounted on the outer surface of the original structure, and can also be mounted on the inner surface of the original structure according to actual requirements.

Preferably, the cross section of the energy-consuming low-yield-point steel is in a cross shape.

Preferably, the built-in steel plate of the precast beam is provided with built-in stirrups and constructional steel bars, and the steel pipe-steel plate assembly of the precast column is provided with built-in stirrups and constructional steel bars.

Preferably, an additional stirrup is arranged at the joint of the adjacent precast beam and the precast column, and an additional stirrup is arranged at the joint of the adjacent precast column.

Preferably, each of the externally attached frame units is provided with two prefabricated supports.

One end of the prefabricated support is fixedly connected with a node connected with the prefabricated beam and the prefabricated column, and the other end of the prefabricated support is fixed in the middle of the prefabricated beam.

Preferably, the prestressed tendons penetrate through the steel pipes in the built-in steel pipe-steel plate assembly of the prefabricated column, and unbonded mode is adopted.

Preferably, the connecting pieces between the adjacent prefabricated columns are fixedly connected by welding and fasteners; welding rods are arranged between the connecting pieces between the adjacent prefabricated columns to weld and fix the connecting pieces; after welding and fixing, a fastener, an additional stirrup and the like are installed, and after-cast concrete is tightly combined.

Preferably, after the external frame-energy dissipation support structure is fixedly connected with the original structure by adopting the connecting component, concrete is poured at the connecting part; the connecting assembly can be fixed on a prefabricated beam and/or a prefabricated column of the external frame-energy consumption supporting structure, and then the connecting assembly is fixedly connected with an original structure to be reinforced. Namely: the prefabricated beam and/or the prefabricated column are/is fixedly provided with a connecting assembly for connecting with an original structure; and after the external frame-energy dissipation supporting structure is fixedly connected with the original structure by adopting the connecting component, concrete is poured at the connecting part.

Preferably, the low-yield-point energy-consumption steel plate is partially unbonded with the externally poured concrete.

The prefabricated support is internally provided with a low-yield-point energy-consumption steel plate, and the external prefabricated concrete restrains out-of-plane buckling of the low-yield-point energy-consumption steel plate; the externally attached frame-the energy dissipation support needs to be newly added with a structural foundation, and the prestressed tendons penetrate through the steel pipes in the built-in steel pipe-steel plate assembly of the prefabricated column and are unbonded; two ends of the prestressed tendon are anchored respectively, one end of the prestressed tendon is anchored on the prefabricated beam and the prefabricated column at the top, and the other end of the prestressed tendon is anchored in the foundation at the bottom.

When the external prestressed assembly type concrete frame-energy dissipation support reinforced structure of the existing structure is actually used, the construction method comprises the following steps:

(1) prefabricating the precast beam, the precast column and the precast support in advance, and reserving a required connecting piece according to design requirements;

(2) assembling and connecting the precast beams, the precast columns and the precast supports to form an externally attached frame comprising a plurality of externally attached frame units, wherein adjacent externally attached frame units share one precast beam, and the precast supports are installed; after adjacent precast beams and precast columns are fixedly connected through connecting pieces and external fasteners, concrete is poured to combine the precast beams and the precast columns; firstly, a prestressed tendon is inserted between adjacent prefabricated columns, then the adjacent prefabricated columns are fixedly connected, and two ends of the prestressed tendon are anchored;

(3) and then installing and fixing the assembled external frame on a structure to be reinforced.

During specific construction, all prefabricated parts can be fixed on an original structure to be reinforced, and then the prefabricated parts are connected and fixed in pairs; the prefabricated components comprise prefabricated beams, prefabricated columns, prefabricated supports, connecting components and the like.

According to the structure for reinforcing the external prestressed assembly type concrete frame-energy dissipation support of the existing structure, the external prestressed assembly type concrete frame-energy dissipation support is arranged on the original structure to be reinforced, the stress and deformation mode of the original structure is changed, the prefabricated frame and the prefabricated support formed by the prefabricated beam and the prefabricated column provide larger lateral rigidity, the low-yield-point energy dissipation soft steel plate can be used for concentratedly dissipating energy and replacing, and the prestressed ribs realize self-resetting after the structure is shaken; the reinforcing mode adopts the form of member prefabrication and external assembly, does not influence the use of the original structure, and greatly improves the construction efficiency and the reinforcing quality. The damage of an original structure is transferred by arranging the concentrated energy dissipation member, and the after-earthquake restoration capability of the structure is improved by arranging the prestressed tendons and the like.

Has the advantages that: compared with the prior art, the method has the advantages that,

(1) the externally attached frame-energy dissipation support not only contributes to the shock resistance of the reinforced integral structure with larger lateral stiffness of the externally attached frame-energy dissipation support, but also can improve the stress state and the deformation mode of the original structure, so that the structure forms a more reasonable damage yield mechanism;

(2) the external components are prefabricated and assembled on site, the external steel plates at the end parts and the middle parts of the prefabricated components are convenient to connect pairwise, the construction process is outside the structure, the use of the original structure is not influenced, the construction efficiency is greatly improved, the component quality is ensured, and the reinforcing effect is enhanced;

(3) the prefabricated concrete outside the energy dissipation support restrains out-of-plane buckling of the internal cross-shaped steel plate, the cross-shaped steel plate is made of mild steel with low yield point and is not bonded with the concrete part, so that the energy dissipation capability of the cross-shaped steel plate under the action of an earthquake is enhanced, the energy dissipation support concentrates energy dissipation, damage of an original structure is transferred, the original structure is protected, and the energy dissipation support can be replaced after the earthquake;

(4) compared with the method that the energy dissipation support is directly arranged on the original structure, the external attached frame provides the installation position of the energy dissipation support on one hand, and avoids the phenomenon that the node area of the original structure is damaged before the energy dissipation support on the other hand;

(5) the prestressed tendons in the prefabricated column provide the self-resetting capability of the structure, the recoverability of the structure is enhanced, and the residual displacement angle of the structure is reduced, so that the structure can be repaired after an earthquake is really achieved.

Drawings

FIG. 1 is a diagram illustrating the effect of an unreinforced building according to the present invention;

FIG. 2 is an elevation view of an unreinforced building according to the present invention;

FIG. 3 is a diagram showing the effect of three rows of reinforced houses;

FIG. 4 is a three-row reinforced rear elevation view of the house of the present invention;

FIG. 5 is a side view of the three columns of the reinforced housing of the present invention;

FIG. 6 is a diagram illustrating the effect of the externally attached frame-dissipative support structure according to the present invention;

FIG. 7 is an elevation view of the present invention showing the externally attached frame-dissipative support structure;

FIG. 8 is an exploded view of the present invention showing the attached precast girders;

FIG. 9 is an exploded view of the externally attached preformed column of the present invention;

FIG. 10 is an exploded view of the present invention showing the externally attached preformed support;

FIG. 11 is an exploded view of the externally attached precast beam-column-support connection of the present invention;

FIG. 12 is a diagram showing the effect of the externally attached precast beam-column-support connection according to the present invention;

FIG. 13 is an exploded view of the outrigger-support connection of the present invention;

FIG. 14 is a diagram showing the effect of the externally attached precast beam-support connection according to the present invention;

FIG. 15 is an exploded view of the top externally attached precast beam-column connection of the present invention;

FIG. 16 is a diagram showing the effect of the top-layer externally attached precast beam-column connection according to the present invention;

FIG. 17 is an exploded view of the externally attached preformed column-column connection of the present invention;

FIG. 18 is a diagram showing the effect of the externally attached prefabricated column-column connection according to the present invention;

FIG. 19 is an exploded view of a post-end extension connector according to the present invention;

fig. 20 is an exploded view of the connecting assembly between the original and the attached structure of the present invention.

Detailed Description

The following is a detailed description with reference to examples.

As shown in fig. 1 to 7, the external prestressed fabricated concrete frame-energy dissipation support reinforcing structure of the existing structure of the present invention includes an external frame-energy dissipation support structure 2 fixed on the outer surface of an original structure 1 to be reinforced, and the external frame-energy dissipation support structure 2 is divided into three groups and fixed on the original structure 1 at equal intervals.

The externally attached frame-energy dissipation support structure 2 comprises a precast beam 3, a precast column 4 and a precast support 5, wherein the precast beam 3 and the precast column 4 are fixedly connected with each other, and concrete is poured at the connecting node to form an externally attached frame of the externally attached frame-energy dissipation support structure; the prefabricated columns 4 which are fixedly connected in sequence are internally provided with penetrating prestressed tendons 6, and two ends of each prestressed tendon 6 are anchored; the external frame is composed of nine external frame units, the external frame units are rectangular, and two prefabricated supports 5 are symmetrically arranged in each external frame unit; the precast supports 5 are obliquely arranged left and right, one ends of the two precast supports 5 are fixedly connected with the left connecting node and the right connecting node of the precast beam 3 and the precast column 4 respectively, the other ends of the two precast supports are correspondingly fixed at the middle position of the precast beam 3 on the other side, and the positions where the precast supports 5 and the precast beam 3 are fixed are located at the middle position of the precast beam 3. And the externally attached frame units adjacent to each other up and down share one precast beam 3.

The prefabricated beam 3 is prefabricated by pouring concrete 16 through a built-in steel plate 7, the prefabricated column 4 is prefabricated by pouring concrete 16 through a built-in steel pipe-steel plate assembly 23, the prefabricated support 5 is prefabricated by pouring concrete 16 through a built-in low-yield-point energy dissipation steel plate 15, and the cross section of the low-yield-point energy dissipation steel plate 15 is in a cross shape; and connecting pieces for connection are reserved on the precast beams 3, the precast columns 4 and the precast supports 5 and comprise overhanging steel plates 8 and column end overhanging connecting pieces 24, wherein the overhanging steel plates 8 comprise transversely overhanging steel plates and obliquely overhanging steel plates.

Specifically, as shown in fig. 8, transverse outward-protruding steel plates are arranged at two ends of an internal steel plate 7 of the precast beam 3, an oblique steel plate is arranged in the middle of the internal steel plate, an internal stirrup 9 and a construction steel bar 11 are arranged on the internal steel plate 7, and then concrete 16 is poured to form the precast beam, wherein transverse outward-protruding steel plates and oblique outward-protruding steel plates serving as connecting pieces are reserved during pouring; similarly, as shown in fig. 9, column end overhanging connectors 24 are arranged at two ends of a steel tube-steel plate assembly 23 of the prefabricated column 4, the shape of each column end overhanging connector 24 is similar to that of the steel tube-steel plate assembly 23, a transverse overhanging steel plate and an oblique overhanging steel plate are arranged below the steel tube-steel plate assembly 23, a built-in stirrup 9 and a construction steel bar 11 are arranged on the steel tube-steel plate assembly 23, and then concrete 16 is poured to form the prefabricated column, wherein the connectors are reserved during pouring; the middle part of the precast beam 3 positioned at the bottom layer of the external attached frame is not provided with an oblique outward extending steel plate, and the lower end column end of the bottom layer external attached precast column 4 is not provided with an outward extending connecting piece. As shown in fig. 10, two ends of the low-yield-point energy-consumption steel plate 15 of the prefabricated support 5 are provided with transverse overhanging steel plates, and then concrete 16 is poured to reserve the transverse overhanging steel plates; the external precast concrete 16 restrains out-of-plane buckling of the low-yield-point energy-consumption steel plate 15, and the low-yield-point energy-consumption steel plate 15 and the external precast concrete 16 are partially unbonded.

As shown in fig. 11 to 18, the precast beams 3, the precast columns 4 and the precast supports 5 are connected by overhanging steel plates 8, the precast columns 4 are connected with the adjacent precast columns 4 by column end overhanging connecting pieces 24, and the precast beams 3 and the precast columns 4 on the top layer are connected with the overhanging connecting pieces 24 by the overhanging steel plates 8. Meanwhile, a structural foundation needs to be newly added for the externally attached frame-energy dissipation supporting structure 2, the prestressed tendons 6 penetrate through steel pipes in the built-in steel pipe-steel plate assembly 23 of the prefabricated column 4 and are unbonded, two ends of each prestressed tendon 6 are respectively anchored, one end of each prestressed tendon is anchored on the prefabricated beam 3 and the prefabricated column 4 at the top, and the other end of each prestressed tendon is anchored in the foundation at the bottom.

The precast beam 3 and the precast column 4 are fixedly connected through a connecting steel plate 12 and a high-strength bolt 14, an additional stirrup 10 is arranged, and post-cast concrete 13 is tightly combined; the prefabricated support 5 is tightly combined with the prefabricated beam 3 and the prefabricated column 4 through a connecting steel plate 12 and a high-strength bolt 14. The overhanging steel plate 8, the column end overhanging connector 24, the connecting steel plate 12 and the column end connecting plate 25 are provided with holes in advance, and the position of the hole 17 of the overhanging steel plate 8 is ensured to correspond to the connecting steel plate 12, and the position of the hole 17 of the column end overhanging connector 24 corresponds to the column end connecting plate 25.

As shown in fig. 17 to 19, between adjacent prefabricated columns 4, firstly, a welding rod 26 is added between the upper and lower column-end overhanging connectors 24, the upper and lower column-end overhanging connectors 24 are fixed by welding, and then, the post-cast concrete 13 is tightly combined through the column-end connecting plate 25, the bolt 22 and the additional stirrup 10.

Finally, the external frame-dissipative support 2 is combined with the original structure 1 to be reinforced by the connecting assembly 18. As shown in fig. 20, the connection assembly 18 between the original structure 1 and the external frame-energy dissipation support 2 includes three parts, an original structure connection member 19, an external structure connection member 20, and an additional connection member 21; the original structure connecting piece 19 is fixedly connected with the original structure 1 by a bolt 22; the external structure connecting piece 20 is welded with the built-in steel pipe-steel plate assembly 23 of the external prefabricated column 4 and is integrated with the prefabricated column 4. The original structure connecting piece 19 and the external structure connecting piece 20 are tightly combined with the additional connecting piece 21 through bolts 22; the additional connecting piece 21 extends out of the two steel plates in the connecting direction, and a gap between the steel plates is convenient for the original structure connecting piece 19 and the external additional structure connecting piece 20 to be embedded; a steel plate is extended out of the additional connecting piece 21 in the direction perpendicular to the connecting direction to increase the connecting rigidity in the direction; the cast-in-place concrete 13 forms a whole after the connection is completed.

When the external prestressed assembly type concrete frame-energy dissipation support reinforced structure of the existing structure is actually used, the construction method comprises the following steps:

(1) prefabricating the precast beam, the precast column and the precast support in advance, and reserving a required connecting piece according to design requirements;

(2) assembling and connecting the precast beams, the precast columns and the precast supports to form an externally attached frame comprising a plurality of externally attached frame units, wherein adjacent externally attached frame units share one precast beam, and the precast supports are installed; after adjacent precast beams and precast columns are fixedly connected through connecting pieces and external fasteners, concrete is poured to combine the precast beams and the precast columns; firstly, a prestressed tendon is inserted between adjacent prefabricated columns, then the adjacent prefabricated columns are fixedly connected, and two ends of the prestressed tendon are anchored;

(3) and then installing and fixing the assembled external frame on a structure to be reinforced.

The invention can greatly improve the construction efficiency and the reinforcement quality under the condition of not influencing the use of the original structure 1 to be reinforced.