阅读说明：本技术 干式全装配工业化混凝土柱柱节点的施工工艺 (Construction process for dry-type fully-assembled industrialized concrete column joint ) 是由 沈华 于 2021-08-10 设计创作，主要内容包括：本发明提供一种干式全装配工业化混凝土柱柱节点施工工艺,包括上预制混凝土柱、上预留螺栓孔连接钢板、上加劲板组、上连接钢管、下预制混凝土柱、下预留螺栓孔连接钢板、下加劲板组、下连接钢管和高强连接螺栓,上连接钢管固定连接于上预留螺栓孔连接钢板的上方,上加劲板组连接于上连接钢管与上预留螺栓孔连接钢板之间,上柱纵向钢筋的下部沿周向焊接固定于上连接钢管的上部外周；下预制混凝土柱相对于上预制混凝土柱对称设置；上预留螺栓孔连接钢板与下预留螺栓孔连接板通过高强度螺栓连接固定。本发明基于钢管混凝土原理提出了一种干式全装配工业化混凝土柱柱节点的构造和制造安装工艺,相对于其他方案具有更好的力学性能、可靠性和经济性。(The invention provides a dry-type full-assembly industrialized concrete column joint construction process, which comprises an upper precast concrete column, an upper reserved bolt hole connecting steel plate, an upper stiffening plate group, an upper connecting steel pipe, a lower precast concrete column, a lower reserved bolt hole connecting steel plate, a lower stiffening plate group, a lower connecting steel pipe and a high-strength connecting bolt, wherein the upper connecting steel pipe is fixedly connected above the upper reserved bolt hole connecting steel plate; the lower precast concrete column is symmetrically arranged relative to the upper precast concrete column; the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting plate are fixedly connected through a high-strength bolt. The invention provides a construction, manufacturing and installation process of a dry-type fully-assembled industrialized concrete column node based on a steel tube concrete principle, and the dry-type fully-assembled industrialized concrete column node has better mechanical property, reliability and economy compared with other schemes.)

1. A construction process of a dry-type fully-assembled industrialized concrete column node is characterized in that the dry-type fully-assembled industrialized concrete column node can be arranged at any position in a concrete column; when the concrete column node is arranged at the reverse bending point of the concrete column, the concrete column node can be designed according to the unequal strength principle.

2. The construction process of the dry-type fully assembled industrial concrete column node as claimed in claim 1, it is characterized in that the dry-type fully-assembled industrialized concrete column joint comprises an upper precast concrete column, an upper reserved bolt hole connecting steel plate, an upper stiffening plate group, an upper connecting steel pipe, a lower precast concrete column, a lower reserved bolt hole connecting steel plate, a lower stiffening plate group, a lower connecting steel pipe and a high-strength connecting bolt, the lower end of the upper connecting steel pipe is fixedly connected above the connecting steel plate with the upper reserved bolt holes, the upper stiffening plate group comprises a plurality of upper stiffening plates, the plurality of upper stiffening plates are circumferentially distributed along the outer side of the lower part of the upper connecting steel pipe and are connected between the outer wall surface of the upper connecting steel pipe and the upper end surface of the connecting steel plate with the upper reserved bolt holes, the lower parts of a plurality of upper column longitudinal steel bars in the upper precast concrete column are welded and fixed on the periphery of the upper part of the upper connecting steel pipe along the circumferential direction;

the upper end of the lower connecting steel pipe is fixedly connected below the lower reserved bolt hole connecting steel plate, the lower stiffening plate group comprises a plurality of lower stiffening plates, the lower stiffening plates are circumferentially distributed along the outer side of the upper part of the lower connecting steel pipe and are connected between the outer wall surface of the lower connecting steel pipe and the lower end surface of the lower reserved bolt hole connecting steel plate, and the upper parts of a plurality of lower column longitudinal steel bars in the lower precast concrete column are circumferentially welded and fixed on the periphery of the lower part of the lower connecting steel pipe;

the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting plate are fixedly connected through a high-strength bolt;

the construction process of the dry-type fully-assembled industrialized concrete column joint comprises a manufacturing process of an upper precast concrete column, a manufacturing process of a lower precast concrete column and an installation process of the upper precast concrete column and the lower precast concrete column, wherein,

the manufacturing process of the upper precast concrete column comprises the following steps:

1-1, preparing an upper connecting steel pipe by cutting a section steel pipe or welding the steel pipe, wherein the length of the upper connecting steel pipe comprises: the welding length of the upper column longitudinal steel bar and the upper connecting steel pipe, the thickness of a protective layer of the upper column longitudinal steel bar, the height of a bolt and an operation space;

1-2, arranging bolt holes on the connecting steel plate blank according to design requirements to manufacture a connecting steel plate with reserved bolt holes;

1-3, welding the lower end of the upper connecting steel pipe prepared in the step 1-1 on the upper reserved bolt hole connecting steel plate prepared in the step 1-2, and welding an upper stiffening plate group between the upper connecting steel pipe and the upper reserved bolt hole connecting steel plate according to design requirements until the mechanical property of a concrete column joint is met;

1-4, pouring concrete in the upper connecting steel pipe and maintaining to form a steel pipe concrete structure of the upper connecting section;

1-5, welding and fixing the lower part of the upper column longitudinal steel bar and the outer side of the upper part of the upper connecting steel pipe on two sides, and then binding a column stirrup to form an upper precast concrete column reinforcement cage;

1-6, placing the precast concrete column reinforcement cage formed in the step 1-5 in a template, pouring precast column concrete, and performing autoclaved curing to reach the designed strength, and then demoulding to prepare an upper precast concrete column;

1-7, after the delivery inspection of the upper precast concrete column manufactured in the step 1-6 is finished, transporting the upper precast concrete column to an assembly construction site;

the manufacturing process of the lower precast concrete column comprises the following steps:

2-1, preparing a lower connecting steel pipe by cutting a steel section steel pipe or welding the steel pipe, wherein the length of the lower connecting steel pipe comprises: the welding length of the lower column longitudinal steel bar and the lower connecting steel pipe, the thickness of a protective layer of the lower column longitudinal steel bar, the length of a bolt and an operation space;

2-2, forming bolt holes in the connecting steel plate blank according to design requirements to manufacture a connecting steel plate with reserved bolt holes at the lower part;

2-3, welding the lower end of the lower connecting steel pipe prepared in the step 2-1 on the lower reserved bolt hole connecting steel plate prepared in the step 2-2, and welding a lower stiffening plate group between the lower connecting steel pipe and the lower reserved bolt hole connecting steel plate according to design requirements until the mechanical property of the concrete column joint is met;

2-4, pouring concrete inside the lower connecting steel pipe and maintaining to form a lower connecting section steel pipe concrete structure;

2-5, welding and fixing the upper part of the longitudinal steel bar of the lower column and the outer side of the lower part of the lower connecting steel pipe on two sides, and then binding a column stirrup to form a lower precast concrete column reinforcement cage;

2-6, placing the precast concrete column reinforcement cage formed in the step 2-5 in a template, pouring precast column concrete, and performing autoclaved curing to the designed strength to obtain a stripper plate to prepare a lower precast concrete column;

2-7, after the delivery inspection of the lower precast concrete column manufactured in the step 2-6 is finished, transporting the lower precast concrete column to an assembly construction site;

the mounting process of the upper and lower precast concrete columns comprises the following steps:

3-1, respectively hoisting the upper precast concrete column and the lower precast concrete column to preset positions, and aligning bolt holes on the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting steel plate;

3-2, connecting the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting steel plate by adopting a high-strength connecting bolt so as to relatively fix the upper precast concrete column and the lower precast concrete column;

and 3-3, performing anticorrosion and fireproof treatment on exposed steel of the concrete column joint.

3. The construction process of the dry-type fully-assembled industrial concrete column joint as claimed in claim 2, wherein in the steps 1-4 and 2-4, when the concrete inside the upper and lower connecting steel pipes is poured, the micro-expansive concrete is adopted and a rough surface of the concrete is formed to ensure the bonding between the new and old concrete.

4. The construction process of the dry-type fully assembled industrial concrete column-column joint as claimed in claim 2, wherein in the step 3-3, the joint area is filled with anticorrosive and fireproof materials while anticorrosive and fireproof treatments are performed on exposed steel of the concrete column-column joint.

Technical Field

The invention belongs to the field of prefabricated concrete structure engineering, and particularly relates to a construction process of a dry-type fully-assembled industrialized concrete column joint.

Background

The industrialized concrete structure is an industrialized construction mode of a building structure, wherein a concrete member is produced in a factory, and is transported to a construction site for installation after being maintained and accepted, and the industrialized concrete structure is a building structure. The development of an industrialized concrete structure is beneficial to promoting energy conservation and emission reduction of the whole society, realizing 'four sections and one environment protection', improving the labor productivity, ensuring the quality of construction engineering, promoting the reform of a supply side, resolving surplus capacity, and finally achieving the informatization and industrialization of the construction industry.

The column is a vertical key component of the building structure and plays a role in bearing upper load and transferring the load to the foundation. In a mainstream dry-type industrialized concrete structure, column-column connection mainly adopts a grouting sleeve technology, the technology needs to embed a grouting steel sleeve in the lower end of a column and reserve a rib at the upper end of the column, and grouting material is injected into the sleeve to complete upper-lower section-column connection after a field component is hoisted in place. The grouting sleeve technology development still has the defects up to now: (1) the embedded steel sleeve of the column end and the reserved rib require accurate positioning, otherwise, the butt joint installation is difficult on site; (2) no effective detection means is available for controlling the sleeve grouting construction quality, which may cause some potential safety hazards; (3) the sleeve has complex manufacturing process and higher manufacturing cost, and the construction cost is increased. At present, other dry-type industrial concrete column joints are connected in a bolt or welding mode. For example, the chinese invention patent CN201710815988.0 discloses a novel assembled connecting structure of a concrete column and a concrete column, which comprises an upper concrete column and a lower concrete column, wherein the bottom of the upper concrete column is fixedly connected with the upper end plate of an upper connecting member through pre-embedded threaded high-strength steel bars and nuts, and the top of the lower concrete column is fixedly connected with the lower end plate of the lower connecting member through pre-embedded threaded high-strength steel bars and nuts; the upper end plate of the upper connecting piece, the cross-shaped steel pipe short column of the upper connecting piece and the lower end plate of the reserved bolt holes at the four corners of the upper connecting piece are fixedly connected, and the upper end plate of the reserved bolt holes at the four corners of the lower connecting piece, the cross-shaped steel pipe short column of the lower connecting piece and the lower end plate of the lower connecting piece are fixedly connected; the bolt hole reserved at four corners between the lower end plate of the bolt hole reserved at four corners of the upper connecting piece and the upper end plate of the bolt hole reserved at four corners of the lower connecting piece are connected and fixed through high-strength bolts. The invention adopts full bolt assembly, has reliable quality, fast construction progress and high efficiency, greatly simplifies the structural design of the node, is convenient for factory prefabrication, is easy to disassemble and replace, can realize speed modular assembly construction, and is particularly suitable for high-rise or super high-rise buildings. The novel assembled connecting structure of the concrete column and the concrete column has the following defects: 1. the embedded high-strength steel bars with threads and the nuts are fixed with the end plates of the connecting pieces, so that the manufacturing difficulty is high and the cost is high; 2. the concrete column longitudinal ribs are directly connected with the upper end plate of the connecting piece, no measures for ensuring the coordination of stress and deformation are provided, and the reliability of the connection of the nut to the end plate is poor; 3. the short column of the cross-shaped steel pipe of the connecting piece is hollow, so that the rigidity mutation between the concrete column and the steel pipe is obvious; 4. the connecting end plate between the concrete column and the steel pipe short column greatly increases the steel consumption and the welding workload; 5. due to the structural form of the node, the arrangement of the high-strength connecting bolt is limited, and the bearing capacity of the node is difficult to improve.

Chinese utility model patent CN201920572600.3 discloses a prefabricated assembled post column connected node, including last prefabricated column component, bolt down, go up precast concrete post column shaft and prefabricated column component down, the connecting element has set up the web section, the web section weld into "rice" font by a plurality of blocks steel sheet. The utility model discloses a through set up at last prefabricated column connecting element's connecting elements and welded into "rice font" web section by a plurality of steel sheets for column connection node's connected mode passes the power clear and definite, reliable, and the atress performance is better. The utility model discloses a prefabricated assembled post column connected node need not can accomplish the operation through wet operation, effectively promotes dress concrete structure efficiency to can realize assembling rapidly, accelerate construction speed, can reduce the time limit for a project by a wide margin. The prefabricated column connecting joint has the following defects: 1. the cross section of the node web plate in the shape of a Chinese character 'mi' is difficult to manufacture and is not beneficial to improving the mechanical property; 2. the longitudinal bar in the concrete column is directly connected with the upper connecting plate, and no stress and deformation coordination measures are taken; 3. the rigidity mutation between the cross section of the web plate of the node shaped like the Chinese character 'mi' and the cross section of the concrete column is obvious; 4. the lower connecting plate is connected with the threaded sleeve through bolts, and the requirement on the manufacturing precision of the node is extremely high; 5. the threaded sleeves pre-embedded in the concrete columns not only require accurate positioning, but also have higher cost.

Because the field welding quality is difficult to ensure, the welding mode is rarely adopted in engineering practice. Bolt connection itself is a mature steel construction connection mode, but its application in industrialization concrete structure, and the structure of current node exists mechanical design unreasonable, node connection structure complicacy to and the required precision of manufacturing construction is too high scheduling problem, leads to being difficult to popularize and apply. Therefore, the development of a dry-type fully-assembled industrialized concrete column node with the characteristics of simple structure, easy maintenance, detachability, reliable performance, good economy and the like and with remarkable industrialized characteristics and a manufacturing and installing process thereof are urgently needed.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a construction process of a dry-type fully-assembled industrialized concrete column joint, which has the advantages of simple structure, easy maintenance, detachability, reliable performance and good economical efficiency.

In order to solve the technical problem, an embodiment of the present invention provides a construction process for a dry-type fully-assembled industrial concrete column-column node, where the dry-type fully-assembled industrial concrete column-column node can be disposed at any position in a concrete column; when the concrete column node is arranged at the reverse bending point of the concrete column, the concrete column node can be designed according to the unequal strength principle.

The dry-type fully-assembled industrialized concrete column node comprises an upper precast concrete column, an upper reserved bolt hole connecting steel plate, an upper stiffening plate group, an upper connecting steel tube, a lower precast concrete column, a lower reserved bolt hole connecting steel plate, a lower stiffening plate group, a lower connecting steel tube and a high-strength connecting bolt, wherein the lower end of the upper connecting steel tube is fixedly connected above the upper reserved bolt hole connecting steel plate;

the upper end of the lower connecting steel pipe is fixedly connected below the lower reserved bolt hole connecting steel plate, the lower stiffening plate group comprises a plurality of lower stiffening plates, the lower stiffening plates are circumferentially distributed along the outer side of the upper part of the lower connecting steel pipe and are connected between the outer wall surface of the lower connecting steel pipe and the lower end surface of the lower reserved bolt hole connecting steel plate, and the upper parts of a plurality of lower column longitudinal steel bars in the lower precast concrete column are circumferentially welded and fixed on the periphery of the lower part of the lower connecting steel pipe;

the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting plate are fixedly connected through a high-strength bolt;

the construction process of the dry-type fully-assembled industrialized concrete column joint comprises a manufacturing process of an upper precast concrete column, a manufacturing process of a lower precast concrete column and an installation process of the upper precast concrete column and the lower precast concrete column, wherein,

the manufacturing process of the upper precast concrete column comprises the following steps:

1-1, preparing an upper connecting steel pipe by cutting a section steel pipe or welding the steel pipe, wherein the length of the upper connecting steel pipe comprises: the welding length of the upper column longitudinal steel bar and the upper connecting steel pipe, the thickness of a protective layer of the upper column longitudinal steel bar, the height of a bolt and an operation space;

1-2, arranging bolt holes on connecting steel plate blanks according to design requirements, and manufacturing connecting steel plates 3 with reserved bolt holes;

1-3, welding the lower end of the upper connecting steel pipe prepared in the step 1-1 on the upper reserved bolt hole connecting steel plate prepared in the step 1-2, and welding an upper stiffening plate group between the upper connecting steel pipe and the upper reserved bolt hole connecting steel plate according to design requirements until the mechanical property of a concrete column joint is met;

1-4, pouring concrete in the upper connecting steel pipe and maintaining to form a steel pipe concrete structure of the upper connecting section, so that the strength and rigidity of the connecting relative component are not reduced;

1-5, welding and fixing the lower part of the upper column longitudinal steel bar and the outer side of the upper part of the upper connecting steel pipe on two sides, and then binding a column stirrup to form an upper precast concrete column reinforcement cage, wherein the arrangement is not required within the range of the connecting steel pipe;

1-6, placing the precast concrete column reinforcement cage formed in the step 1-5 in a template, pouring precast column concrete, and performing autoclaved curing to reach the designed strength, and then demoulding to prepare an upper precast concrete column;

1-7, after the delivery inspection of the upper precast concrete column manufactured in the step 1-6 is finished, transporting the upper precast concrete column to an assembly construction site;

the manufacturing process of the lower precast concrete column comprises the following steps:

2-1, preparing a lower connecting steel pipe by cutting a steel section steel pipe or welding the steel pipe, wherein the length of the lower connecting steel pipe comprises: the welding length of the lower column longitudinal steel bar and the lower connecting steel pipe and the thickness of a protective layer of the lower column longitudinal steel bar;

2-2, forming bolt holes in the connecting steel plate blank according to design requirements to manufacture a connecting steel plate with reserved bolt holes at the lower part;

2-3, welding the upper end of the lower connecting steel pipe prepared in the step 2-1 on the lower reserved bolt hole connecting steel plate prepared in the step 2-2, and welding a lower stiffening plate group between the lower connecting steel pipe and the lower reserved bolt hole connecting steel plate according to design requirements until the mechanical property of the concrete column joint is met;

2-4, pouring concrete in the lower connecting steel pipe and maintaining to form a lower connecting section steel pipe concrete structure, so that the strength and rigidity of the connection relative to the member are not reduced;

2-5, welding and fixing the upper part of the longitudinal steel bar of the lower column and the outer side of the lower part of the lower connecting steel pipe on two sides, and then binding a column stirrup to form a lower precast concrete column reinforcement cage, wherein the arrangement is not required within the range of the connecting steel pipe;

2-6, placing the precast concrete column reinforcement cage formed in the step 2-5 in a template, pouring precast column concrete, and performing autoclaved curing to the designed strength to obtain a stripper plate to prepare a lower precast concrete column;

2-7, after the delivery inspection of the lower precast concrete column manufactured in the step 2-6 is finished, transporting the lower precast concrete column to an assembly construction site;

the mounting process of the upper and lower precast concrete columns comprises the following steps:

3-1, respectively hoisting the upper precast concrete column and the lower precast concrete column to preset positions, and aligning bolt holes on the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting steel plate;

3-2, connecting and fixing the upper reserved bolt hole connecting steel plate and the lower reserved bolt hole connecting steel plate by adopting a high-strength connecting bolt, so that the upper precast concrete column and the lower precast concrete column are relatively fixed;

and 3-3, performing anticorrosion and fireproof treatment on exposed steel of the concrete column joint.

In the steps 1-4 and 2-4, when concrete inside the upper connecting steel pipe and the lower connecting steel pipe is poured, micro-expansion concrete is adopted, and a rough concrete surface is formed so as to ensure the bonding between the new concrete and the old concrete.

And 3-3, performing anticorrosion and fireproof treatment on exposed steel of the concrete column joint, and filling anticorrosion and fireproof materials in a connecting area.

The technical scheme of the invention has the following beneficial effects:

1. the dry-type fully-assembled industrialized concrete column node provided by the invention has the advantages of simple structure, regular members, convenience in transportation, capability of completing welding work and concrete pouring in a factory, good manufacturing and maintenance conditions, controllable product quality and reliable performance. The components are transported to the site and are installed by adopting full bolt connection, the structure is detachable, the building structure has obvious building industrialization characteristics, standardized production can be realized, the construction efficiency is improved, the construction period is shortened, and the construction cost is effectively reduced.

2. The invention creatively adopts the steel pipe concrete to connect the columns and the columns, achieves that the connection rigidity and the strength are not reduced, can be selectively arranged at any part in the columns, and greatly improves the mechanical property and the reliability of the column-column connection.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is an enlarged view of the structure of the upper precast concrete column of the present invention;

FIG. 4 is a flow chart of the construction process of the present invention.

Description of reference numerals:

1. mounting a precast concrete column; 2. lower precast concrete column; 3. connecting steel plates with reserved bolt holes; 4. connecting a steel plate with a lower reserved bolt hole; 5. an upper stiffener group; 6 lower stiffening plate group; 7. an upper connecting steel pipe; 8. a lower connecting steel pipe; 9. a high-strength connecting bolt; 10. upper column longitudinal steel bars; 11. lower column longitudinal steel bars; 12. arranging a precast concrete column reinforcement cage; 13. and (5) lower precast concrete column reinforcement cages.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-3, the present invention provides a dry-type fully-assembled industrial concrete column node, which can be disposed at any position in a concrete column; when the concrete column node is arranged at the reverse bending point of the concrete column, the concrete column node can be designed according to the unequal strength principle.

The dry-type fully-assembled industrialized concrete column node comprises an upper precast concrete column 1, an upper reserved bolt hole connecting steel plate 3, an upper stiffening plate group 5, an upper connecting steel tube 7, a lower precast concrete column 2, a lower reserved bolt hole connecting steel plate 4, a lower stiffening plate group 6, a lower connecting steel tube 8 and a high-strength connecting bolt 9, wherein the lower end of the upper connecting steel tube 7 is fixedly connected above the upper reserved bolt hole connecting steel plate 3, the upper stiffening plate group 5 comprises a plurality of upper stiffening plates, the upper stiffening plates are circumferentially distributed along the outer side of the lower part of the upper connecting steel tube 7 and connected between the outer wall surface of the upper connecting steel tube 7 and the upper end surface of the upper reserved bolt hole connecting steel plate 3, and the lower parts of a plurality of upper column longitudinal steel bars 10 in the upper precast concrete column 1 are circumferentially welded and fixed on the periphery of the upper part of the upper connecting steel tube 7.

The upper end of the lower connecting steel pipe 8 is fixedly connected below the lower reserved bolt hole connecting steel plate 4, the lower stiffening plate group 6 comprises a plurality of lower stiffening plates which are circumferentially distributed along the outer side of the upper portion of the lower connecting steel pipe 8 and connected between the outer wall surface of the lower connecting steel pipe 8 and the lower end surface of the lower reserved bolt hole connecting steel plate 4, and the upper portions of the lower column longitudinal steel bars 11 in the lower precast concrete column 2 are circumferentially welded and fixed on the periphery of the lower portion of the lower connecting steel pipe 8.

The upper reserved bolt hole connecting steel plate 3 and the lower reserved bolt hole connecting plate 4 are fixedly connected through a high-strength bolt 9. The thicknesses of the upper reserved bolt hole connecting steel plate 3 and the lower reserved bolt hole connecting steel plate 4 are determined according to the requirement of the bending resistance bearing capacity of connection. The number, the arrangement and the specification of the high-strength connecting bolts 9 are determined according to the requirements of bending resistance and shearing resistance bearing capacity of the nodes, the distance between the center of each bolt and the outer edge of the steel plate and the distance between the bolts meet the requirements of relevant specifications, and the construction requirements of the bolts are met.

The concrete filled in the upper connecting steel pipe 7 and the lower connecting steel pipe 8 forms a steel pipe concrete structure, which is the core content of the structure of the invention, the concrete in the steel pipe is restrained, the specification of the steel pipe and the strength of the concrete are calculated and determined, and the rigidity and the strength of the column connection are not reduced.

The shape, size and welding seam of the upper stiffening plate group 5 and the lower stiffening plate group 6 are determined according to the bending resistance bearing capacity requirement and meet the relevant specification. In this embodiment, the upper stiffening plate group 5 includes 8 upper stiffening plates, each of which is a triangular plate, wherein a right-angle side is welded and fixed to the outer wall surface of the upper connecting steel pipe 7, and the other right-angle side is welded and fixed to the upper end surface of the upper connecting steel plate 3 with the upper reserved bolt hole. The lower stiffening plate group 6 comprises 8 lower stiffening plates which are triangular plates, wherein one right-angle edge is welded and fixed with the outer wall surface of the lower connecting steel pipe 8, and the other right-angle edge is welded and fixed with the lower end surface of the lower reserved bolt hole connecting steel plate 4.

The lower part of the upper column longitudinal steel bar 10 is fixed with the upper part of the upper connecting steel pipe 7 in a double-sided welding mode, the upper part of the lower column longitudinal steel bar 11 is fixed with the lower part of the lower connecting steel pipe 8 in a double-sided welding mode, parameters such as welding length and the like are determined according to equal-strength calculation, and the requirements of relevant specifications are met. The double-sided welding not only can effectively reduce the length of the connecting steel pipe, but also simplifies the connection between the column longitudinal bar and the connecting steel plate.

The length of the upper connecting steel pipe is not less than the welding length of the upper column longitudinal steel bar 10 and the upper connecting steel pipe, the thickness of a protective layer of the upper column longitudinal steel bar 10, the height of the bolt and the height of the operation space.

As shown in fig. 4, the present invention also provides a construction process of a dry-type fully-assembled industrial concrete column node, which comprises a manufacturing process of an upper precast concrete column, a manufacturing process of a lower precast concrete column, and an installation process of the upper and lower precast concrete columns, wherein,

the manufacturing process of the upper precast concrete column comprises the following steps:

1-1, preparing an upper connecting steel pipe 7 by cutting a section steel pipe or welding a steel pipe, wherein the length of the upper connecting steel pipe comprises: the welding length of the upper column longitudinal steel bar 10 and the upper connecting steel pipe, the thickness of a protective layer of the upper column longitudinal steel bar 10, the height of a bolt and an operation space;

1-2, arranging bolt holes on a connecting steel plate blank according to design requirements, wherein the diameters, the intervals, the edge distances and the like of the bolt holes all meet the design specification requirements, and manufacturing a connecting steel plate 3 with reserved bolt holes;

1-3, welding the lower end of the upper connecting steel pipe 7 prepared in the step 1-1 on the upper reserved bolt hole connecting steel plate 3 prepared in the step 1-2, and welding an upper stiffening plate group 5 between the upper connecting steel pipe 7 and the upper reserved bolt hole connecting steel plate 3 according to design requirements until the mechanical property of the concrete column joint is met;

1-4, pouring concrete in the upper connecting steel pipe 7 and maintaining to form a steel pipe concrete structure of the upper connecting section, so that the strength and rigidity of the connecting relative component are not reduced;

1-5, welding and fixing the lower part of an upper column longitudinal steel bar 10 and the outer side of the upper part of an upper connecting steel pipe 7 on two sides, and then binding a column stirrup to form an upper precast concrete column reinforcement cage 12, wherein the arrangement is not required within the range of the connecting steel pipe;

1-6, placing the precast concrete column reinforcement cage formed in the step 1-5 in a template, pouring precast column concrete, and performing autoclaved curing to reach the designed strength, and then demoulding to prepare an upper precast concrete column;

1-7, after the delivery inspection of the upper precast concrete column manufactured in the step 1-6 is finished, transporting the upper precast concrete column to an assembly construction site;

the manufacturing process of the lower precast concrete column comprises the following steps:

2-1, preparing a lower connecting steel pipe 8 by cutting a section steel pipe or welding the steel pipe, wherein the length of the lower connecting steel pipe comprises: the welding length of the lower column longitudinal steel bar 11 and the lower connecting steel pipe, and the thickness of a protective layer of the lower column longitudinal steel bar 11;

2-2, forming bolt holes in the connecting steel plate blank according to design requirements to manufacture a connecting steel plate 4 with reserved bolt holes;

2-3, welding the lower end of the lower connecting steel pipe 8 prepared in the step 2-1 on the lower reserved bolt hole connecting steel plate 4 prepared in the step 2-2, and welding a lower stiffening plate group 6 between the lower connecting steel pipe 8 and the lower reserved bolt hole connecting steel plate 4 according to design requirements until the mechanical property of the concrete column joint is met;

2-4, pouring concrete in the lower connecting steel pipe 8 and maintaining to form a lower connecting section steel pipe concrete structure, so that the strength and rigidity of the connecting relative component are not reduced;

2-5, welding and fixing the upper part of the lower column longitudinal steel bar 11 and the outer side of the lower part of the lower connecting steel pipe 8 on two sides, and then binding a column stirrup to form a lower precast concrete column reinforcement cage 13, wherein the arrangement is not required within the range of the connecting steel pipe;

2-6, placing the precast concrete column reinforcement cage formed in the step 2-5 in a template, pouring precast column concrete, and performing autoclaved curing to the designed strength to obtain a stripper plate to prepare a lower precast concrete column;

2-7, after the delivery inspection of the lower precast concrete column manufactured in the step 2-6 is finished, transporting the lower precast concrete column to an assembly construction site;

the mounting process of the upper and lower precast concrete columns comprises the following steps:

3-1, respectively hoisting the upper precast concrete column and the lower precast concrete column to preset positions, and aligning bolt holes on the upper reserved bolt hole connecting steel plate 3 and the lower reserved bolt hole connecting steel plate 4;

3-2, connecting the upper reserved bolt hole connecting steel plate 3 with the lower reserved bolt hole connecting steel plate 4 by adopting a high-strength connecting bolt 9, so that the upper and lower precast concrete columns are relatively fixed;

3-3, performing anticorrosion and fireproof treatment on exposed steel of the concrete column joint, and filling anticorrosion and fireproof materials in the connecting area to enable the column to be more regular.

In the steps 1-4 and 2-4, when concrete inside the upper connecting steel pipe and the lower connecting steel pipe is poured, micro-expansion concrete is adopted, and a rough surface of the concrete is formed, so that the bonding between the new concrete and the old concrete is ensured.

Compared with the prior art, the invention has the following characteristics:

1. the concrete filled steel tube technology and the principle are adopted in the industrialized concrete column-column joint for the first time, the strength performances of axial force, shearing resistance, bending resistance and the like of the column are greatly improved, and meanwhile, the rigidity of the joint is not reduced relative to a concrete member, so that the concrete filled steel tube joint can be applied to the connection of the column end part, the column reverse bending point or any part of the column, and has extremely high flexibility.

2. The concrete longitudinal steel bars are innovatively welded on the side wall of the steel pipe on two sides, the welding is simple and easy, the quality is controllable and stable, the force transmission is direct and reliable, and the construction cost is effectively reduced because the steel pipe does not need to be additionally provided with stirrups.

3. The stiffening ribs between the connecting steel pipes and the connecting steel plates can be flexibly arranged, so that the stability of the connecting steel pipes can be effectively enhanced, the transmission of the bending moment of the joint is guaranteed, the deformation of the steel plates at the end parts is reduced, and the bending resistance of the joint can be greatly improved.

4. The column node adopts a section indentation type structure and a bolt connection, so that the detachability of the node is effectively realized, and the innovation provides that the section indentation part is filled with anticorrosive and fireproof materials to realize the regularity of the node appearance and improve the corrosion resistance and the fireproof performance of the node.

The structures, proportions, sizes, and the like of the embodiments of the present invention have been described in a manner consistent with the description thereof, which will be read and understood by those skilled in the relevant art, and are not intended to limit or restrict the scope of the invention in which the structure of the present invention may be practiced. Any modification and decoration without affecting the efficacy of the present invention shall fall within the scope of the present invention. The words used in this specification have been included for clarity and conciseness of description, and insubstantial technical variations are considered to be within the scope of what the invention can be practiced.

The above is only a preferred construction of the invention, it should be noted that for those skilled in the art, without departing from the concept of the invention, several variations and modifications can be made, which should also be regarded as the protection scope of the invention, and these will not affect the effect of the implementation of the invention and the practicability of the patent.