阅读说明：本技术 一种预制预应力钢管混凝土柱及施工方法 (Prefabricated prestressed steel pipe concrete column and construction method ) 是由 王秉宇 张艳玲 李刚 王艳武 陈洪昌 汪洋 刘兴旺 于 2021-08-11 设计创作，主要内容包括：本发明属于建筑施工技术领域,公开了一种预制预应力钢管混凝土柱及施工方法,预制预应力钢管混凝土柱主要是由钢管、油质隔离剂、定位架、混凝土、钢模板、螺栓、柱顶连接件、柱脚连接件组成,钢模板位于整个装置的外部；所述的外钢板的内壁涂有油质隔离剂,浇筑混凝土,使钢管和混凝土保持隔离状态；柱顶连接件以及柱脚连接件分别位于整个柱顶、柱脚,起到支架的作用；定位架分为上定位架、下定位架。本发明提供的预制预应力钢管混凝土柱的施工方法制得的预应力钢管混凝土柱构造简单,预先对内部混凝土施加预压应力,提高混凝土的抗压强度,在受荷初期就能发挥钢管的约束作用,受力性能好。(The invention belongs to the technical field of building construction, and discloses a prefabricated prestressed steel pipe concrete column and a construction method, wherein the prefabricated prestressed steel pipe concrete column mainly comprises a steel pipe, an oil isolating agent, a positioning frame, concrete, a steel template, a bolt, a column top connecting piece and a column base connecting piece, wherein the steel template is positioned outside the whole device; the inner wall of the outer steel plate is coated with an oily isolating agent, and concrete is poured to keep the steel pipe and the concrete in an isolated state; the column top connecting piece and the column base connecting piece are respectively positioned on the whole column top and the column base and play a role of a bracket; the positioning frame is divided into an upper positioning frame and a lower positioning frame. The prestressed steel pipe concrete column prepared by the construction method of the prefabricated prestressed steel pipe concrete column provided by the invention has a simple structure, exerts a pre-compressive stress on the internal concrete in advance, improves the compressive strength of the concrete, can exert the constraint effect of a steel pipe at the initial stage of loading, and has good stress performance.)

1. The construction method of the prefabricated prestressed concrete-filled steel tube column is characterized by comprising the following steps of:

step one, erecting a lower positioning frame at the bottom of a construction position, and sleeving and fixing a lower-side inner steel pipe outside a middle supporting table of the lower positioning frame;

sleeving an outer steel pipe with the inner wall coated with the oily separant in an annular groove on the outer edge of the lower positioning frame, and erecting two semicircular steel templates on the outer side of the outer steel pipe;

placing an annular reinforcing mesh on the inner side of the outer steel pipe, and pouring concrete to the inner side of the outer steel pipe, wherein the upper surface of the concrete is flush with the upper end of the outer steel pipe;

fourthly, arranging an upper positioning frame on an upper end cover of the outer steel pipe, and fixedly connecting the upper positioning frame with the steel diaphragm plate on the lower side through bolts;

fifthly, an upper inner steel pipe penetrates through concrete poured into the outer steel pipe in the middle of the upper positioning frame, the upper end of the upper inner steel pipe is exposed out of the outer steel pipe, and concrete is poured into the upper inner steel pipe;

and step six, after the concrete is solidified to reach the preset strength, sequentially dismantling the upper positioning frame and the steel template, and separating the concrete filled steel tubular column from the lower positioning frame.

2. The construction method of a precast prestressed concrete-filled steel tube column as recited in claim 1, wherein an inner diameter of said lower inner steel tube is slightly larger than that of said upper inner steel tube, and an exposed height of said upper inner steel tube is slightly smaller than that of said lower inner steel tube.

3. The construction method of the precast prestressed concrete-filled steel tube column as recited in claim 1, wherein a plurality of column-top connectors are interposed between the middle of the upper positioning frame and the outer wall of the upper inner steel tube, and the plurality of column-top connectors are uniformly distributed along the outer wall of the upper inner steel tube.

4. The construction method of the precast prestressed concrete filled steel tube column according to claim 1, wherein a plurality of column foot connecting members are provided outside the lower spacer, the upper ends of the column foot connecting members are fixedly connected with the outside of the steel form, and the plurality of column foot connecting members are uniformly distributed along the outer wall of the steel form.

5. The construction method of the precast prestressed concrete filled steel tube column as recited in claim 4, wherein said column base connecting member is a triangular plate structure, and a horizontal support plate is provided at a lower end of said column base connecting member.

6. The construction method of a precast prestressed concrete-filled steel tube column as recited in claim 1, wherein the length of the upper-side inner steel tube higher than the outer steel tube portion is one-third of the entire length of the upper-side inner steel tube.

7. The construction method of a precast prestressed concrete-filled steel tube column as recited in claim 1, wherein said lower spacer is provided with a bottom plate, a pillar and an intermediate support platform, said intermediate support platform being connected to the middle of the upper end of the bottom plate through the pillar.

8. The construction method of a precast prestressed concrete filled steel tube column as recited in claim 7, wherein a lattice-shaped reinforcing bar is fixed to a lower end of said bottom plate.

9. The construction method of the precast prestressed concrete filled steel tube column as recited in claim 7, wherein an annular groove matched with the steel form is formed on the upper surface of the bottom plate.

10. The construction method of a precast prestressed concrete-filled steel tube column as recited in claim 1, wherein axes of said outer steel tube, upper inner steel tube and lower inner steel tube coincide.

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a prefabricated prestressed steel pipe concrete column and a construction method.

Background

At present: the steel pipe concrete column has good stress performance, the compressive strength of the concrete is improved under the beam of the outer steel pipe, and the outer steel pipe is not easy to be buckled and damaged under the support of the inner concrete. However, the constraint of the outer steel pipe to the inner concrete is in a passive loading initial stage, the poisson ratio of steel is larger than that of concrete, the steel pipe has no constraint effect on the concrete, when the poisson ratio of the concrete is larger than that of the steel, the transverse deformation of the concrete is larger than that of the steel pipe, the concrete is transversely constrained by the steel pipe, the concrete is in a three-dimensional compression state, and the strength is improved. However, the conventional common concrete filled steel tubular column cannot reduce the passive restraint of the outer steel tube on the internal concrete, so that the internal concrete is not uniformly stressed. The traditional common concrete filled steel tubular column has large cost consumption, poor effect and low overall efficiency.

Through the above analysis, the problems and defects of the prior art are as follows:

(1) the common steel tube concrete column can not reduce the passive restraint of the outer steel tube on the internal concrete, so that the internal concrete is not uniformly stressed.

(2) The traditional common concrete filled steel tubular column has large cost consumption, poor effect and low overall efficiency.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a precast prestressed concrete filled steel tube column and a construction method.

The invention is realized in such a way that the construction method of the precast prestressed steel tube concrete column comprises the following steps:

step one, erecting a lower positioning frame at the bottom of a construction position, and sleeving and fixing a lower-side inner steel pipe outside a middle supporting table of the lower positioning frame;

sleeving an outer steel pipe with the inner wall coated with the oily separant in an annular groove on the outer edge of the lower positioning frame, and erecting two semicircular steel templates on the outer side of the outer steel pipe;

placing an annular reinforcing mesh on the inner side of the outer steel pipe, and pouring concrete to the inner side of the outer steel pipe, wherein the upper surface of the concrete is flush with the upper end of the outer steel pipe;

fourthly, arranging an upper positioning frame on an upper end cover of the outer steel pipe, and fixedly connecting the upper positioning frame with the steel diaphragm plate on the lower side through bolts;

fifthly, an upper inner steel pipe penetrates through concrete poured into the outer steel pipe in the middle of the upper positioning frame, the upper end of the upper inner steel pipe is exposed out of the outer steel pipe, and concrete is poured into the upper inner steel pipe;

and step six, after the concrete is solidified to reach the preset strength, sequentially dismantling the upper positioning frame and the steel template, and separating the concrete filled steel tubular column from the lower positioning frame.

Further, the internal diameter of steel pipe in the downside slightly is greater than steel pipe in the upside, the height that exposes of steel pipe in the upside slightly is less than the height of steel pipe in the downside.

Furthermore, go up the locating rack centre and press from both sides between the interior steel pipe outer wall of upside and be equipped with a plurality of capital connecting pieces, a plurality of capital connecting pieces are along steel pipe outer wall evenly distributed in the upside.

Further, the locating rack outside is provided with a plurality of column foot connecting pieces down, column foot connecting piece upper end and steel form outside fixed connection, a plurality of column foot connecting pieces are along steel form outer wall evenly distributed.

Furthermore, the column base connecting piece is of a triangular plate structure, and a horizontal support plate is arranged at the lower end of the column base connecting piece.

Furthermore, the length of the upper side inner steel pipe higher than the outer steel pipe part is one third of the whole length of the upper side inner steel pipe.

Further, the lower positioning frame is provided with a bottom plate, a support column and a middle support platform, and the middle support platform is connected to the middle of the upper end of the bottom plate through the support column.

Furthermore, the lower end of the bottom plate is fixed with latticed reinforcing ribs.

Furthermore, the upper surface of the bottom plate is provided with an annular groove matched with the steel template.

Further, the axes of the outer steel pipe, the upper inner steel pipe and the lower inner steel pipe are overlapped.

By combining all the technical schemes, the invention has the advantages and positive effects that:

the prestressed steel pipe concrete column prepared by the construction method of the prefabricated prestressed steel pipe concrete column provided by the invention has a simple structure, exerts a pre-compressive stress on the internal concrete in advance, improves the compressive strength of the concrete, can exert the constraint effect of a steel pipe at the initial stage of loading, and has good stress performance. Through last steel pipe and lower steel pipe, can couple together two prefabricated prestressing force steel pipe concrete columns, can transmit pressure well. The construction method can realize the application of prestress. The invention can solve the problem of concrete restraint of the steel tube in the initial stage of loading, improve the stress performance of the steel tube concrete column in the use stage and realize assembly construction. And the cost reduces by a wide margin, through the prestressing force mode, can foresee the bearing capacity of each component in advance to effectively reduce the deflection of each constitution, overall structure is simple, convenient to popularize and use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.

Fig. 1 is a flow chart of a construction method of a precast prestressed concrete-filled steel tube column according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an outer steel pipe according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a steel form according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a lower locating rack according to an embodiment of the present invention.

In the figure: 1. an outer steel tube; 2. an upper inner steel pipe; 3. a lower inner steel pipe; 4. an oily release agent; 5. an upper positioning frame; 6. a lower positioning frame; 7. concrete; 8. a steel form; 9. a bolt; 10. a column top connector; 11. a column shoe attachment; 12. an intermediate support table; 13. a base plate; 14. and a support pillar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In view of the problems in the prior art, the present invention provides a precast prestressed concrete filled steel tube column and a construction method thereof, and the following describes the present invention in detail with reference to the accompanying drawings.

As shown in fig. 1, a construction method of a precast prestressed concrete filled steel tube column according to an embodiment of the present invention includes:

s101, erecting a lower positioning frame at the bottom of a construction position, and sleeving and fixing a lower inner steel pipe outside a middle supporting table of the lower positioning frame;

s102, sleeving an outer steel pipe with the inner wall coated with an oily separant in an annular groove on the outer edge of a lower positioning frame, and erecting two semicircular steel templates on the outer side of the outer steel pipe;

s103, placing an annular reinforcing mesh on the inner side of the outer steel pipe, and pouring concrete to the inner side of the outer steel pipe, wherein the upper surface of the concrete is flush with the upper end of the outer steel pipe;

s104, arranging an upper positioning frame on the upper end cover of the outer steel pipe, and fixedly connecting the upper positioning frame with the steel diaphragm plate on the lower side through bolts;

s105, an upper inner steel pipe penetrates through concrete poured into the outer steel pipe in the middle of the upper positioning frame, the upper end of the upper inner steel pipe is exposed out of the outer steel pipe, and the concrete is poured into the upper inner steel pipe;

and S106, after the concrete is solidified to reach the preset strength, sequentially dismantling the upper positioning frame and the steel template, and separating the concrete filled steel tubular column from the lower positioning frame.

As shown in fig. 2 to 4, the inner diameter of the lower inner steel pipe in the embodiment of the present invention is slightly larger than that of the upper inner steel pipe, and the exposed height of the upper inner steel pipe is slightly smaller than that of the lower inner steel pipe.

In the embodiment of the invention, a plurality of column top connecting pieces are clamped between the middle of the upper positioning frame and the outer wall of the upper inner steel pipe, and are uniformly distributed along the outer wall of the upper inner steel pipe.

The outer side of the lower positioning frame in the embodiment of the invention is provided with a plurality of column base connecting pieces, the upper ends of the column base connecting pieces are fixedly connected with the outer side of the steel formwork, and the column base connecting pieces are uniformly distributed along the outer wall of the steel formwork.

The column base connecting piece in the embodiment of the invention is of a triangular plate structure, and a horizontal support plate is arranged at the lower end of the column base connecting piece.

The length of the upper side inner steel pipe higher than the outer steel pipe part in the embodiment of the invention is one third of the whole length of the upper side inner steel pipe.

The lower positioning frame in the embodiment of the invention is provided with a bottom plate, a strut and a middle supporting platform, wherein the middle supporting platform is connected to the middle of the upper end of the bottom plate through the strut, the lower end of the bottom plate is fixedly provided with a latticed reinforcing rib, and the upper surface of the bottom plate is provided with an annular groove matched with a steel template.

The axes of the outer steel pipe, the upper inner steel pipe and the lower inner steel pipe in the embodiment of the invention are overlapped.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention disclosed herein, which is within the spirit and principle of the present invention, should be covered by the present invention.