阅读说明：本技术 一种钢管混凝土叠合柱及修复方法 (Steel pipe concrete composite column and repairing method ) 是由 龚田牛 秦丽 李峥 于 2021-08-26 设计创作，主要内容包括：本发明公开了结构工程技术领域的一种钢管混凝土叠合柱的修复方法,旨在解决在地震作用下钢管混凝土叠合柱塑性铰处外层混凝土出现裂缝或提前剥离的问题。其方法包括对待修复钢管混凝土叠合柱进行损伤评估,仅当钢管混凝土叠合柱的塑性铰外层混凝土出现损伤时,进行如下操作：清理塑性铰外层已损伤的混凝土；采用模板和方木对清理后的塑性铰进行固定支护；采用具有延性的复合材料浇筑于支护后的塑性铰处,对钢管混凝土叠合柱进行加固修复。本发明适用于地震震级较小,对于部分钢管混凝土叠合柱结构受到地震的损坏进行修复处理,能够减少对震级较小的震后重建带来的资源、时间的浪费以及环境的污染。(The invention discloses a method for repairing a concrete-filled steel tube composite column in the technical field of structural engineering, and aims to solve the problem that outer-layer concrete at a plastic hinge of the concrete-filled steel tube composite column cracks or is stripped in advance under the action of an earthquake. The method comprises the following steps of evaluating damage of the concrete-filled steel tube composite column to be repaired, and only when the concrete on the outer layer of the plastic hinge of the concrete-filled steel tube composite column is damaged, performing the following operations: cleaning damaged concrete on the outer layer of the plastic hinge; fixing and supporting the cleaned plastic hinges by using a template and square wood; and (3) pouring a ductile composite material at the plastic hinge after supporting, and reinforcing and repairing the concrete-filled steel tube composite column. The method is suitable for repairing and processing the damage of a part of the concrete-filled steel tube composite column structure caused by the earthquake with smaller earthquake magnitude, and can reduce the waste of resources and time and the environmental pollution caused by the post-earthquake reconstruction with smaller earthquake magnitude.)

1. A method for repairing a concrete filled steel tube composite column, which is characterized by comprising the following steps:

and (3) carrying out damage assessment on the steel pipe concrete composite column to be repaired, and carrying out the following operations only when the concrete on the outer layer of the plastic hinge of the steel pipe concrete composite column is damaged:

cleaning damaged concrete on the outer layer of the plastic hinge;

fixing and supporting the cleaned plastic hinge;

and (3) pouring a ductile composite material at the plastic hinge after supporting, and reinforcing and repairing the concrete-filled steel tube composite column.

2. The method for repairing a concrete filled steel tube composite column according to claim 1, wherein the damage comprises: the plastic hinge outer concrete cracks and/or peels off.

3. The method for repairing a concrete filled steel tube composite column according to claim 1, wherein a support member is used for fixing and supporting, and the support member comprises a plurality of templates and a plurality of square timbers; the plurality of templates are fixedly connected through the square timber to form a repair area which is arranged around the periphery of the plastic hinge.

4. The method for repairing a concrete filled steel tube composite column according to claim 3, wherein the height of the formwork is not lower than the height of the plastic hinge.

5. The method of repairing a steel tube concrete composite column according to claim 1, wherein the composite material comprises an engineering cement-based composite material.

6. The method for repairing a concrete filled steel tube composite column according to claim 1 or 5, wherein the composite material is poured to a thickness at least enabling the outer diameter of the repaired plastic hinge to be flush with the outer diameter of the steel tube concrete composite column where the steel tube concrete composite column is not damaged.

7. The steel tube concrete composite column comprises a steel tube and concrete fillers filled in the steel tube, and is characterized in that concrete wrapping layers are poured on the periphery of the steel tube except plastic hinges of the steel tube concrete composite column, composite materials are poured at the plastic hinges, and the composite materials are in seamless connection with the concrete wrapping layers.

8. The composite concrete filled steel tube column according to claim 7, wherein the composite material comprises an engineered cement based composite material.

9. The concrete-filled steel tube composite column according to claim 7 or 8, wherein reinforcing ribs are further arranged on the periphery of the steel tube, and the reinforcing ribs are embedded in the concrete wrapping layer and the composite material.

10. The concrete-filled steel tube composite column according to claim 9, wherein the reinforcing ribs comprise a plurality of longitudinal ribs and a plurality of stirrups, the plurality of longitudinal ribs are distributed along the circumferential direction of the steel tube, the plurality of stirrups are distributed along the axial direction of the steel tube, and the stirrups are fixedly connected with the longitudinal ribs.

Technical Field

The invention relates to a concrete filled steel tube composite column and a repairing method thereof, belonging to the field of structural engineering.

Technical Field

China is a multi-earthquake country, earthquakes occur for a plurality of times every year basically, most earthquakes have small earthquake magnitude, and a large amount of dismantling and rebuilding work causes environmental pollution, waste of time, resources and cost and the like.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a concrete-filled steel tube composite column and a repairing method thereof, which can improve the seismic performance of the concrete-filled steel tube composite column and avoid the waste of resources and time and the environmental pollution caused by reconstruction aiming at small seismic levels in the past.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

in one aspect, the present invention provides a method for repairing a concrete filled steel tube composite column, including:

and (3) carrying out damage assessment on the steel pipe concrete composite column to be repaired, and carrying out the following operations only when the concrete on the outer layer of the plastic hinge of the steel pipe concrete composite column is damaged:

cleaning damaged concrete on the outer layer of the plastic hinge;

fixing and supporting the cleaned plastic hinge;

and (3) pouring a ductile composite material at the plastic hinge after supporting, and reinforcing and repairing the concrete-filled steel tube composite column.

Further, the injury comprises: the plastic hinge outer concrete cracks and/or peels off.

Further, a support piece is adopted for fixing and supporting, and the support piece comprises a plurality of templates and a plurality of square timbers; the plurality of templates are fixedly connected through the square timber to form a repair area which is arranged around the periphery of the plastic hinge.

Further, the height of the template is not lower than that of the plastic hinge.

Further, the composite material comprises an engineering cement-based composite material.

Furthermore, the pouring thickness of the composite material at least enables the outer diameter of the repaired plastic hinge to be flush with the outer diameter of the non-damaged part of the concrete filled steel tube composite column.

On the other hand, the invention provides a concrete-filled steel tube composite column, which comprises a steel tube and concrete fillers filled in the steel tube, wherein concrete wrapping layers are poured on the periphery of the steel tube except for plastic hinges of the concrete-filled steel tube composite column, a ductile composite material is poured at the plastic hinges, and the composite material is in seamless joint with the concrete wrapping layers.

Further, the composite material comprises an engineering cement-based composite material.

Furthermore, the periphery of the steel pipe is also provided with reinforcing ribs which are embedded in the concrete wrapping layer and the composite material.

Further, the strengthening rib includes many vertical bars and many stirrups, and many vertical bars distribute along steel pipe circumference, and many stirrups distribute along the steel pipe axial, stirrup and vertical bar fixed connection.

Compared with the prior art, the invention has the following beneficial effects:

the method for repairing the steel pipe concrete composite column is used for repairing the post-earthquake building with smaller earthquake magnitude, and avoids the waste of resources and time and the pollution to the environment caused by the reconstruction aiming at the small earthquake magnitude in the prior art. In the repairing process, the steel pipe concrete composite column is repaired and reinforced by using the composite material with ductility, and the material can greatly improve the anti-seismic performance of the repaired steel pipe concrete composite column.

The method for repairing the steel pipe concrete composite column has simple steps, can effectively improve the repair working efficiency after a small-scale earthquake, saves the heavy and complicated workload of reconstruction, and reduces the dust pollution and excessive waste of materials in the reconstruction work.

Drawings

Fig. 1 is a flowchart of a method for repairing a concrete filled steel tube composite column according to an embodiment of the present invention;

FIG. 2 is a schematic view of a concrete filled steel tube composite column with damaged plastic hinges;

FIG. 3 is a schematic view of the concrete filled steel tube composite column after cleaning the damaged part;

FIG. 4 is a schematic view of a steel pipe concrete composite column in a repaired state;

FIG. 5 is a schematic view of a square section concrete filled steel tube composite column;

FIG. 6 is a schematic view of a concrete filled steel tube composite column with a circular cross section;

in the figure: 1. a steel tube concrete superposed column; 2. longitudinal ribs; 3. a steel pipe; 4. hooping; 5. plastic reaming; 6. A template; 7. a composite material; 8. a support member; 9. and (4) square wood.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows:

referring to fig. 1, the present invention provides a method for repairing a concrete filled steel tube composite column, which may be used for repairing and reinforcing the concrete filled steel tube composite column shown in fig. 2 after a earthquake, the method comprising:

carrying out damage assessment on the concrete filled steel tube composite column to be repaired, and carrying out the following operation only when the concrete on the outer layer of the plastic hinge of the concrete filled steel tube composite column is damaged

The method comprises the following steps: as shown in figure 3, the damaged concrete on the outer layer of the plastic hinge is cleaned, and the position needing repairing can be clearly exposed when the plastic hinge is cleaned.

Step two: as shown in fig. 4, the cleaned plastic hinges are fixedly supported, and the plastic hinges are fixedly supported by using supporting pieces and auxiliary materials, so that the repairing capability is improved.

Step three: the composite material with ductility is poured at the plastic hinge after supporting, the steel pipe concrete composite column is reinforced and repaired, the composite material comprises engineering cement-based composite material, the ductility of the composite material is stronger than that of common concrete, and the anti-seismic performance of the steel pipe concrete composite column is enhanced when the composite material is poured in the damaged steel pipe concrete composite column.

Specifically, as shown in fig. 2, the concrete damage degree of the outer layer of the plastic hinge 5 of the concrete filled steel tube composite column 1 is divided into: the concrete-filled steel tube composite column has three degrees of cracking, stripping or cracking and stripping, damage to the outer layer of the plastic hinge 5 of the concrete-filled steel tube composite column can be supplemented and repaired by using the composite material 7, wherein the compression peak strain and the ultimate strain of the engineering cement-based composite material in the composite material are 2 times of those of common concrete, and the seismic performance of the repaired concrete-filled steel tube composite column can be effectively improved.

Specifically, the support member 8 includes: a plurality of templates 6 and a plurality of square timber 9, as shown in fig. 3, fig. 4, after the compound post of steel pipe concrete damage clearance, it is fixed to utilize a fender 8 to strut, and a plurality of templates 6 pass through square timber 9 fixed connection, form to enclose and locate the restoration interval of plastic hinge 5 periphery, further fix a plurality of templates 6 and square timber 9 of having strutted through iron nail, iron wire in addition for the complete restoration of compound post of steel pipe concrete is promoted more effectively in the restoration process.

It should be noted that the height of the template 6 for repairing the steel tube concrete composite column is not lower than that of the plastic hinge 5, and the template with the height can effectively and comprehensively support the damaged plastic hinge in the repairing process.

Specifically, the casting thickness of the composite material used in the repairing process can enable the outer diameter of the repaired plastic hinge 5 to be at least flush with the outer diameter of the non-damaged part of the concrete filled steel tube composite column, so that the purpose is to fully repair the damaged concrete filled steel tube composite column by using the composite material and restore the damaged concrete filled steel tube composite column to the shape of the concrete filled steel tube composite column before being damaged by the earthquake.

Example two:

referring to fig. 5 and 6, in the embodiment of the invention, a concrete wrapping layer is poured on the periphery of a steel pipe 3 of the steel pipe-concrete composite column except for a plastic hinge 5 of the steel pipe 3-concrete composite column, a composite material with ductility is coated at the plastic hinge 5, and the composite material is in seamless joint with the concrete wrapping layer, so that the seismic performance of the steel pipe-concrete composite column is effectively improved.

Specifically, the composite material can be an engineering cement-based composite material, the compressive strength of the engineering cement-based composite material is approximately 30-90MPa, the compressive strain is higher than that of common concrete, the bending resistance of the engineering cement-based composite material is also better than that of the common cement-based composite material, and the engineering cement-based composite material has stronger control capability on crack development in the process of repairing the damage of the concrete-filled steel tube composite column.

Specifically, the periphery of the steel tube 3 in the concrete filled steel tube composite column is also provided with reinforcing ribs, and the reinforcing ribs are embedded in the concrete wrapping layer and the composite material and used for enhancing the rigidity and the strength of the concrete filled steel tube composite column and blocking damage caused by an earthquake with a certain magnitude.

According to the embodiment of the invention, the reinforcing rib comprises a plurality of longitudinal ribs 2 and a plurality of stirrups 4, the longitudinal ribs 2 are circumferentially distributed along the steel pipe 3, the stirrups 4 are axially distributed along the steel pipe 3, and the stirrups 4 are fixedly connected with the longitudinal ribs 2, so that the seismic performance of the concrete-filled steel pipe composite column is effectively improved.

The concrete filled steel tube composite column is cut along the direction perpendicular to the longitudinal bars 2, the section of the concrete filled steel tube composite column is square or circular, and concrete filled steel tube composite columns with different section forms are selected according to different scenes.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.