阅读说明：本技术 一种装配式trc-钢管复合约束混凝土柱及其安装方法 (Assembled TRC-steel tube composite confined concrete column and mounting method thereof ) 是由 张勤 解雨璇 李振 代欢欢 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种装配式TRC-钢管复合约束混凝土柱及其安装方法,结构包括混凝土柱节段以及连接底板组合件,连接底板组合件和上下两个混凝土柱节段相互匹配、连接紧密,实现预制柱装配,混凝土柱节段由TRC外壳、约束钢管及核心混凝土组成,且约束钢管连接端四周设有半封闭灌浆套筒连接件；连接底部组合件主要由钢板、小直径开口套筒及带连接钢筋组成；上、下柱节段通过钢板组合件连接时,小直径开口套筒与半封闭灌浆套筒连接件套接,钢板与钢管套接。其工厂预制,现场快速定位安装,无需现场浇筑,无养护过程；具有施工快速,防腐,实用性强及连接可靠等优点,解决了传统装配式混凝土柱节点连接质量差、施工环境得不到保障的问题。(The invention discloses an assembled TRC-steel tube composite confined concrete column and an installation method thereof, wherein the structure comprises concrete column segments and a connecting bottom plate assembly, the connecting bottom plate assembly and an upper concrete column segment and a lower concrete column segment are matched and tightly connected with each other to realize the assembly of a prefabricated column, the concrete column segments consist of a TRC shell, a confined steel tube and core concrete, and semi-closed grouting sleeve connectors are arranged on the periphery of the connecting end of the confined steel tube; the connecting bottom assembly mainly comprises a steel plate, a small-diameter opening sleeve and a connecting steel bar; when the upper and lower column sections are connected through the steel plate assembly, the small-diameter opening sleeve is sleeved with the semi-closed grouting sleeve connecting piece, and the steel plate is sleeved with the steel pipe. The device is prefabricated in a factory, is quickly positioned and installed on site, does not need to be poured on site, and does not have a maintenance process; the method has the advantages of high construction speed, corrosion resistance, high practicability, reliable connection and the like, and solves the problems that the traditional assembled concrete column joint is poor in connection quality and the construction environment cannot be guaranteed.)

1. The utility model provides an assembled TRC-compound confined concrete post of steel pipe which characterized in that: the TRC-steel tube composite confined concrete column comprises TRC-steel tube composite confined concrete column sections (1) and a connecting bottom plate assembly (2), wherein the two TRC-steel tube composite confined concrete column sections (1) are connected through the connecting bottom plate assembly (2);

the TRC-steel tube composite confined concrete column segment (1) comprises a confined steel tube (11), a hollow hole (111), a semi-closed grouting sleeve connecting piece (12), a grouting nozzle (121), a grout outlet nozzle (122), concrete (13) and a TRC shell (14); the restraint steel pipe (11) is a square pipe, the TRC shell (14) wraps the restraint steel pipe (11), concrete (13) is filled in the restraint steel pipe (11), a circle of semi-closed grouting sleeve connecting piece (12) is arranged at the position, close to the connecting bottom plate assembly (2), of the restraint steel pipe (11) along the inner edge, the semi-closed grouting sleeve connecting piece (12) is provided, one end opening of the semi-closed grouting sleeve connecting piece (12) is closed, the opening of the other end opening of the semi-closed grouting sleeve connecting piece is communicated with the outside, a grouting nozzle (121) is arranged on the semi-closed grouting sleeve connecting piece (12) close to the closed end, a grout outlet nozzle (122) is arranged close to the open end, hollow holes (111) are formed in the positions, located at the grouting nozzle (121) and the grout outlet nozzle (122), and the grout outlet nozzle (121) and the grout outlet nozzle (122) are inserted and communicated with the outside respectively corresponding to the hollow holes (111);

the connecting bottom plate assembly (2) comprises a steel plate (21), a threaded hole (211), a small-diameter opening sleeve (22), an external thread (221), an internal thread (222), a grout outlet hole (223) and a threaded connecting steel bar (23); threaded holes (211) are arranged on the two surfaces of the steel plate (21) along the periphery, the threaded holes (211) are through holes, the position of one threaded hole (211) corresponds to two small-diameter opening sleeves (22) on the two sides, an external thread (221) is arranged outside one end of each small-diameter opening sleeve (22), an internal thread (222) is arranged inside the small-diameter opening sleeve, the thickness of the external thread (221) is 1/2 that of the steel plate (211) and is matched with the threaded holes (211), a grout outlet (223) is arranged at the position, close to the end part, of each small-diameter opening sleeve (22), after the small-diameter opening sleeves (22) are inserted into the semi-closed grouting sleeve connecting piece (12), the grout outlet (223) is overlapped with the grout outlet (122), the whole body of the threaded connecting steel bar (23) is threaded, the threaded connecting steel bar (23) is inserted and fixed into the small-diameter opening sleeves (22) on the two sides of the threaded hole (211), and the through steel plate (21) is matched and fixed with the internal thread (222).

2. The fabricated TRC-tubular composite confined concrete column as claimed in claim 1, wherein: the length of the threaded connection steel bar (23) is larger than that of the small-diameter opening sleeve (22) and is smaller than 2 times of that of the semi-closed grouting sleeve connecting piece (12).

3. The fabricated TRC-tubular composite confined concrete column as claimed in claim 1, wherein: the TRC shell (14) is made of a TRC composite material, the TRC composite material is formed by compounding fine aggregate concrete and a fiber fabric net, the fiber fabric net is used as a reinforcing rib, and a fine aggregate concrete cement-based material is used as a matrix.

4. The fabricated TRC-tubular composite confined concrete column as claimed in claim 3, wherein: the TRC shell (14) plays a role in restraining the concrete (13) of the column body in the steel pipe (11) in a core mode, the compression resistance of the concrete (13) is improved, and the compression stress borne by the concrete (13) is sigma_r，σ_rThe calculation formula of (a) is as follows:

in the above formula, n is the number of fiber woven net laying layers in the TRC shell (14); f. of_fThe ultimate tensile strength of the weft carbon fiber bundles; a. the_fIs the cross-sectional area of the fiber bundle; f. of_yLimiting tensile strength of the weft-direction constraint steel pipe (11); a. the_nTo restrain the cross section area of the steel pipe (11); s is the space between the fiber fabric grids; d_seThe side length of the core concrete 13.

5. The fabricated TRC-tubular composite confined concrete column as claimed in claim 1, wherein: one end of the concrete (13) facing the connecting bottom plate assembly (2) is a plane, the opening of the semi-closed grouting sleeve connecting piece (12) is flush with the end face of the concrete (13), and the distance between the plane end of the concrete (13) and the end face of the constraint steel pipe (11) is 1/2 steel plate (21) thickness.

6. The fabricated TRC-tubular composite confined concrete column as claimed in claim 1, wherein: the shear resistance V of the concrete (13) in the constraint steel pipe (11) is shared by the threaded connecting steel bar (23) and the small-diameter opening sleeve (22), and the calculation formula of V is as follows:

V＝V₁+V₂

in the above formula, V₁For shear-resisting bearing capacity, V, of small-diameter starting sleeve (22)₂The shear bearing capacity of the threaded connection steel bar (23) is improved, and N is the number of the small-diameter opening sleeves (22); f. of_v1A shear strength of the small diameter open sleeve (22); d₁Is the outer diameter of the small diameter opening sleeve (22); d₁The outer diameter of the semi-closed grouting sleeve connecting piece (12); f. of_v2Shear strength of the threaded connection bar (23); d₀The diameter of the cross section of the threaded connecting steel bar (23).

7. The fabricated TRC-tubular composite confined concrete column as claimed in claim 1, wherein: the semi-closed grouting sleeve connecting piece (12) and the small-diameter opening sleeve (22) form a pulling resistance F₁The calculation formula is as follows:

F_s＝fl₂πD₁

in the above formula, the first and second carbon atoms are,the adhesive force of the traditional integral grouting sleeve is improved;is the adhesive force between the small-diameter opening sleeve (22) and the semi-closed grouting sleeve connecting piece (12); f_sIs the friction force between the small-diameter opening sleeve (22) and the semi-closed grouting sleeve connecting piece (12);the average bonding stress between the threaded connecting steel bar (23) and the small-diameter opening sleeve (22) after the connecting slurry is injected; l₀The axial length of the threaded connecting steel bar (23) extending into the semi-closed grouting sleeve (12) is adopted; d₀The diameter of the section (23) of the threaded connection steel bar; l₂The axial length of the small-diameter grouting sleeve (22) extending into the semi-closed grouting sleeve (12); d₁Is the inner diameter of the small-diameter opening sleeve (22); d₁Is the outer diameter of the small-diameter opening sleeve (22).

8. The method for installing the fabricated TRC-tubular composite confined concrete column according to claim 1, comprising the following steps:

s1, fixing the small-diameter opening sleeves (22) on two sides of the steel plate (21) on the edge of the steel plate (21) in a threaded connection mode for a circle, and embedding external threads (221) of the small-diameter opening sleeves (22) into the steel plate (21);

s2, inserting the threaded connecting steel bar (23) into the small-diameter opening sleeve (22) and twisting the threaded connecting steel bar to the internal thread (222);

s3, welding a grouting nozzle (121) and a grout outlet nozzle (122) of the semi-closed grouting sleeve connecting piece (12) on the hollow hole (111) of the constraint steel pipe (11);

s4, filling core concrete (13) in the constraint steel pipe (11), and pouring the concrete (13) until the opening end of the semi-closed grouting sleeve connecting piece (12) is flush, namely the distance between the surface layer of the concrete (13) and the edge of the constraint steel pipe (11) is 1/2 of the thickness of the steel plate (21);

s5, wrapping the TRC shell (14) outside the constraint steel pipe (11) layer by layer until the TRC shell is flush with the exposed grouting nozzle (121) and the exposed grout outlet nozzle (122);

s6, when the small-diameter open sleeve (22) and the semi-closed grouting sleeve connecting piece (12) are nested with each other, the steel plate (21) is also nested in the two constraint steel pipes (11), and then the two constraint steel pipes (11) are attached to the steel plate (21) and are nested tightly;

s7, when connecting slurry is poured into the TRC-steel tube composite confined concrete column segment (1), the slurry is poured into the slurry pouring nozzle (121) until the slurry uniformly flows out of the slurry outlet nozzle (122), and then all the slurry pouring nozzles (121) and all the slurry outlet nozzles (122) are sealed.

Technical Field

The invention relates to a preparation and connection method of an assembled TRC (textile Reinforcement concrete) -steel tube composite confined concrete column.

Background

Compared with a traditional cast-in-place reinforced concrete structure, the assembled structure has a series of advantages of realizing modularization of building design, convenience in installation and construction process, improvement of construction site environment and labor conditions, resource saving, reduction of building cost, sustainability and efficiency improvement and the like. In order to further promote the health and high-speed development of the assembly type buildings in China, more detailed research on the assembly type buildings is necessary in China.

In a seawater tide area, the traditional assembled steel tube concrete column is corroded by chloride salt, so that the corrosion of steel bars and the deterioration of concrete are easy to occur. The durability of the steel pipe concrete column needs to be further reinforced and repaired to ensure the normal use function of the steel pipe concrete column. With the development and application of new materials, Textile Reinforced Concrete (TRC) is rapidly developed. The TRC has the characteristics of light weight, high strength, corrosion resistance, crack control and the like, and is worthy of further research when being used as a reinforced corrosion-resistant material in a concrete filled steel tubular column.

At present, an annular partition plate and a lining steel pipe section are generally arranged when an assembly type steel pipe concrete column steel pipe is butted in China, and a full penetration groove welding seam is adopted between an upper steel pipe and a lower steel pipe. The pipe segment joints are typically welded in the field. The steel tube concrete column can reasonably combine the assembled structure and the concrete well, and the strong constraint force of the steel tube and the characteristics of factory prefabrication can ensure the stable product quality. However, the steel pipes are connected through the welding seams, the quality of the welding seams is unstable, and the steel pipes on the surfaces of the concrete filled steel pipes are not fireproof if not processed, and are easy to rust and corrode in a chloride environment. In addition, the construction and maintenance quality of the concrete can not be guaranteed in the in-situ pouring process.

In order to improve the connection performance of the steel tube concrete column, patent CN109208823A discloses a quickly assembled steel tube concrete column with a built-in steel box, which utilizes upper and lower connecting steel boxes to penetrate a restraining pull rod and a connecting sleeve to be grouted so as to improve the mechanical engagement force and the bonding force of grouting material, thereby improving the connection performance of a connecting piece. Patent CN109339232A discloses a steel pipe connected node of assembled concrete column, utilizes square steel pipe grout to connect prefabricated concrete column from top to bottom, and then improves the sleeve connection performance. In the two inventions, the connection performance is improved by adding the rigid member in the sleeve, but the connection is complicated in manufacturing, high in cost and difficult in hoisting and positioning while adding, the corrosion resistance is not improved, and the practical application has great limitation.

In summary, there is a need for an assembly type steel tube concrete column connecting piece which has no welding of upper and lower steel tubes, no cast-in-place concrete, fire resistance, corrosion resistance, high construction quality and short construction time.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an assembled TRC-steel tube composite confined concrete column and an installation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the assembled TRC-steel tube composite confined concrete column comprises TRC-steel tube composite confined concrete column sections and a connecting bottom plate assembly, wherein the two TRC-steel tube composite confined concrete column sections are connected through the connecting bottom plate assembly;

the TRC-steel tube composite confined concrete column segment comprises a confined steel tube, a hollow hole, a semi-closed grouting sleeve connecting piece, a grouting nozzle, a grout outlet nozzle, concrete and a TRC shell; the restraint steel pipe is a square pipe, the TRC shell is wrapped outside the restraint steel pipe, concrete is filled in the restraint steel pipe, a circle of semi-closed grouting sleeve connecting piece is arranged at the position, close to the connecting bottom plate assembly, of the restraint steel pipe along the inner edge, one end of the semi-closed grouting sleeve connecting piece is closed, the opening of the other end of the semi-closed grouting sleeve connecting piece is communicated with the outside, a grouting nozzle is arranged on the semi-closed grouting sleeve connecting piece, close to the closed end, a grout outlet nozzle is arranged close to the open end, a circle of the grout outlet nozzle is located at the positions of the grouting nozzle and the grout outlet nozzle, hollow holes are formed in the positions, corresponding to one hollow hole, of the grouting nozzle and the grout outlet nozzle, and the grout outlet nozzle is inserted into and communicated with the outside;

the connecting bottom plate assembly comprises a steel plate, a threaded hole, a small-diameter opening sleeve, an external thread, an internal thread, a grout outlet and a threaded connecting steel bar; threaded hole has all been arranged along edge a week on the two sides of steel sheet, the screw hole is the perforating hole, a screw hole position corresponds two minor diameter opening sleeve in both sides, the outer external screw thread that is of minor diameter opening sleeve's one end, interior being the internal thread, external screw thread thickness be 1/2 steel sheet thickness and with the screw hole cooperation, minor diameter opening sleeve has been close to this tip position and has been seted up out the thick liquid hole, behind minor diameter opening sleeve inserted semi-closed grout muffjoint spare, go out the thick liquid hole and overlap with the play thick liquid mouth, threaded connection reinforcing bar week is the screw thread, insert the threaded connection reinforcing bar and be fixed in screw hole both sides minor diameter opening sleeve, it is fixed with interior screw-thread fit to link up the steel sheet.

As a further preferable scheme, the length of the threaded connection reinforcing steel bar is more than 2 times of the small-diameter opening sleeve and less than 2 times of the semi-closed grouting sleeve connecting piece.

As a further preferable scheme, the TRC shell is a TRC composite material, and the TRC composite material is formed by compounding fine aggregate concrete and a fiber fabric net, wherein the fiber fabric net is used as a reinforcing rib, and the fine aggregate concrete cement-based material is used as a matrix.

As a further preferable scheme, the TRC shell plays a role in core constraint on concrete for constraining the inner cylinder of the steel pipe, the compression resistance of the concrete is improved, and the compressive stress borne by the concrete is sigma_r，σ_rThe calculation formula of (a) is as follows:

in the above formula, n is the number of layers of fiber woven meshes in the TRC shell; f. of_fThe ultimate tensile strength of the weft carbon fiber bundles; a. the_fIs the cross-sectional area of the fiber bundle; f. of_yLimiting tensile strength of the steel pipe in the weft direction; a. the_nTo restrain the cross section area of the steel pipe; s is the space between the fiber fabric grids; d_seThe side length of the core concrete.

As a further preferred scheme, the end of the concrete facing the connecting bottom plate assembly is a plane, the opening of the semi-closed grouting sleeve connecting piece is flush with the end face of the concrete, and the distance between the plane end of the concrete and the end face of the constraint steel pipe is 1/2 steel plate thickness.

As a further preferable scheme, the shear resistance V for restraining the concrete in the steel tube is shared by the threaded connecting steel bar and the small-diameter opening sleeve, and the calculation formula of V is as follows:

V＝V₁+V₂

in the above formula, V₁Shear-resisting capacity, V, of small-diameter start sleeve₂The shear bearing capacity of the threaded connection steel bar is adopted, and N is the number of the small-diameter opening sleeves; f. of_v1Shear strength of the small diameter open sleeve; d₁The outer diameter of the small-diameter opening sleeve; d₁The outer diameter of the semi-closed grouting sleeve connecting piece is the same as the outer diameter of the semi-closed grouting sleeve connecting piece; f. of_v2Shear strength of the threaded connection reinforcing steel bar; d₀The diameter of the cross section of the steel bar is connected by screw threads.

As a further preferred solution, a pullout resistance F is formed between the semi-closed grouting sleeve connection and the small diameter split sleeve₁The calculation formula is as follows:

F_s＝fl₂πD₁

in the above formula, the first and second carbon atoms are,the adhesive force of the traditional integral grouting sleeve is improved;the adhesive force between the small-diameter opening sleeve and the semi-closed grouting sleeve connecting piece is adopted; f_sThe friction force between the small-diameter opening sleeve and the semi-closed grouting sleeve connecting piece is adopted;the average bonding stress between the threaded connection steel bar and the small-diameter opening sleeve after the connection slurry is injected; l₀The axial length of the threaded connection steel bar extending into the semi-closed grouting sleeve is adopted; d₀The diameter of the cross section of the steel bar is connected by screw threads; l₂The axial length of the small-diameter grouting sleeve extending into the semi-closed grouting sleeve is adopted; d₁The inner diameter of the small-diameter opening sleeve is the diameter; d₁Is the outer diameter of the small-diameter opening sleeve.

A mounting method of a fabricated TRC-steel tube composite confined concrete column comprises the following steps:

s1, fixing the small-diameter opening sleeves on the two sides of the steel plate on the periphery of the edge of the steel plate through threaded connection, and embedding external threads of the small-diameter opening sleeves into the steel plate;

s2, inserting the threaded connecting steel bar into the small-diameter opening sleeve, and twisting the threaded connecting steel bar to the internal thread;

s3, welding a grouting nozzle and a grout outlet nozzle of the semi-closed grouting sleeve connecting piece on the hollowed hole of the constraint steel pipe;

s4, filling core concrete in the constraint steel pipe, and pouring the concrete until the open end of the semi-closed grouting sleeve connecting piece is flush, namely the distance between the concrete surface layer and the edge of the constraint steel pipe is 1/2 of the thickness of a steel plate;

s5, wrapping the TRC shell outside the constraint steel pipe layer by layer until the TRC shell is flush with the exposed grouting nozzle and the exposed grout outlet nozzle;

s6, when the small-diameter opening sleeve and the semi-closed grouting sleeve connecting piece are nested with each other, the steel plates are also nested in the two constraint steel pipes, and the two constraint steel pipes are attached to the steel plates and are nested tightly;

and S7, when the TRC-steel tube composite confined concrete column segments are filled with the connecting slurry, filling the slurry into the slurry filling nozzles until the slurry uniformly flows out of the slurry outlet nozzles, and sealing all the slurry filling nozzles and the slurry outlet nozzles.

Has the advantages that: the invention has the advantages that:

(1) the bearing capacity is improved. The TRC shell wrapping the constraint steel tube enhances the constraint performance of the steel tube, performs annular constraint on the steel tube concrete, improves the axial pressure bearing capacity of the core concrete column, and increases the plastic yield capacity of the joint. Meanwhile, after the upper TRC steel pipe concrete column and the lower TRC steel pipe concrete column are connected through the connecting bottom plate assembly, the steel plate on the connecting bottom plate assembly plays a role of a stirrup and also restrains core concrete of the upper column and the lower column.

(2) The construction quality is guaranteed. The invention changes the connecting method of the annular partition plate and the lining steel pipe section before the traditional assembly type steel pipe concrete column connecting piece into the method that the upper steel pipe concrete column section and the lower steel pipe concrete column section are connected by adopting a connecting steel plate assembly. The invention provides double guarantee for the concrete-filled steel tubular column, firstly, the influence of cracks caused by uneven cold and heat in welding when the traditional annular partition plate and the steel pipe section of the lining are arranged is eliminated by utilizing the connection of the separated grouting sleeve; secondly, the maintenance problem after concrete is poured on site is avoided by factory prefabrication.

(3) The construction speed is accelerated. The invention relates to a factory-prefabricated full-assembly type TRC-steel tube composite confined concrete column segment and connecting bottom plate assembly, which is prefabricated in a factory and then transported to the site for high-performance grouting connection. Concrete does not need to be poured in site, so that a demolding link is omitted, and the construction speed is accelerated.

(4) The node has smooth and beautiful appearance. The size of the inner diameter of the steel pipe is the same as that of the steel plate, and 1/2 steel plate thickness spaces are reserved when concrete is filled in the upper and lower TRC concrete filled steel pipe columns. When the upper TRC steel pipe composite confined concrete column and the lower TRC steel pipe composite confined concrete column are connected, the steel plates are completely embedded into the upper column and the lower column, the upper column and the lower column are tightly attached, and the appearance is smooth and attractive.

(5) The connection performance of the upper and lower column sections is improved. Compared with the traditional integral grouting sleeve bonding force, the invention increases the bonding force of the small-diameter opening sleeve and the friction force of the small-diameter opening sleeve and the semi-closed grouting sleeve connecting piece, and the pulling resistance is obviously improved.

(6) The positioning is simple and convenient. The steel plate of connecting the bottom plate sub-assembly is the same with the restraint steel pipe internal diameter size of post segment, and when upper and lower post segment passes through the bottom plate sub-assembly after connecting, the steel plate imbeds upper and lower post segment completely, also represents that big or small sleeve nests closely.

(7) The corrosion resistance is good. The TRC shell of parcel restraint steel pipe makes it have better durability under the chloride environment, and steel pipe and steel sheet are resistant sea water stainless steel material simultaneously, all have good corrosion resistance.

The invention relates to an assembly type TRC-steel tube composite confined concrete column connecting piece, which adds a guarantee measure that a TRC reinforcing and connecting bottom plate assembly is connected with an upper column and a lower column through a grouting sleeve on the traditional assembly type column connecting technology, so that the construction process and the technical measure of the traditional grouting sleeve and the TRC reinforcing technology are still suitable for the TRC steel tube concrete connecting piece.

The invention has the advantages of convenient operation, rapid construction, strong corrosion resistance, strong practicability, reliable connection and the like, solves the problem of poor connection quality of the traditional assembled steel tube concrete column joint, and has good universality and applicability.

Drawings

FIG. 1 is a schematic structural view showing a state in which a steel plate according to the present invention is coupled to upper and lower columns;

FIG. 2 is a schematic structural view of a TRC-tubular composite confined concrete column segment;

FIG. 3 is a schematic structural view of the connection between the steel pipe and the semi-closed grouting sleeve connector according to the present invention;

FIG. 4 is a schematic structural view of a semi-closed grout sleeve connection of the present invention;

FIG. 5 is a side view of a semi-enclosed grout sleeve connection of the present invention;

FIG. 6 is a schematic view of the construction of a small diameter split sleeve of the present invention;

FIG. 7 is a side view of a small diameter split sleeve of the present invention;

FIG. 8 is a cross-sectional view of a connection schematic of a small diameter open sleeve and a semi-enclosed grout sleeve connection of the present invention;

FIG. 9 is a schematic structural view of a prefabricated novel steel plate assembly of the present invention;

FIG. 10 is a view showing a state of use of a TRC concrete-filled square column according to the present invention;

FIG. 11 is a graph of a core concrete stress analysis of the present invention;

wherein the designations in the drawings have the following meanings:

1. TRC-steel tube composite confined concrete column segment: 11. the concrete grouting device comprises a constraint steel pipe, 111, hollowed holes, 12, a semi-closed grouting sleeve connecting piece, 121, grouting nozzles, 122, a grout outlet nozzle, 13, concrete, 14 and a TRC shell;

2. connecting the bottom plate assembly: 21. the steel plate 211, a threaded hole 22, a small-diameter opening sleeve, an external thread 222, an internal thread 223, a grout outlet 23 and a threaded connection reinforcing steel bar.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

As shown in figure 1, the assembled TRC-steel tube composite confined concrete column consists of a TRC-steel tube composite confined concrete column segment 1 and a connecting steel plate assembly 2.

The prefabricated novel steel plate assembly 2 is composed of a steel plate 21, a small-diameter opening sleeve 22 and a threaded connecting steel bar 23. Threaded holes 211 are formed in the two sides of the steel plate 21 along the periphery of the steel plate, the threaded holes 211 are through holes, the two small-diameter opening sleeves 22 are connected to the upper surface and the lower surface of the threaded holes 211 in the steel plate 21 through threads to form a coaxial structure, and after the small-diameter opening sleeves are fixed, the grout outlet holes 223 of the small-diameter opening sleeves face outwards. The threaded connection reinforcing steel bar 23 penetrates through the upper and lower small-diameter opening sleeves 22 and the steel plate 21, the threaded connection reinforcing steel bar 23 is inserted into and fixed on the two coaxial small-diameter opening sleeves 22 of the threaded hole 211, and the threaded connection reinforcing steel bar 23 penetrates through the steel plate 21 and is matched and fixed with the internal thread 222 in the small-diameter opening sleeve 22.

As shown in fig. 2, the prefabricated concrete-filled steel tube column section 1 is composed of a TRC shell 14, a constraint steel tube 11, a semi-closed grouting sleeve connector 12 and concrete 13. The semi-closed grouting sleeve connecting piece 12 is connected with the hollow hole 111 of the restraint steel pipe, concrete 13 is filled in the restraint steel pipe 11, and the TRC shell 14 is wrapped outside the restraint steel pipe layer by layer until the TRC shell 14 is flush with the grouting nozzle 121 and the grout outlet nozzle 122 of the semi-closed grouting sleeve connecting piece. In addition, the TRC shell 14 is provided with a channel for reserving the grouting nozzle 121 and the grout outlet nozzle 122 when being wrapped, so that later grouting and grout outlet are facilitated.

As shown in fig. 3-5, the distance between the upper and lower hollow holes 111 of the steel pipe is equal to the distance between the grouting nozzle 121 and the grout outlet 122 on the semi-closed grouting sleeve connecting piece₁The inner diameter of the hollow hole 111 on the steel pipe is equal to the outer diameters of the grouting nozzle 121 and the grout outlet 122 on the semi-closed grouting sleeve connecting piece, and d is equal to₃The two can be nested within each other.

The semi-closed grouting sleeve connecting piece 12 is placed in the steel pipe from the cup mouth to the outer direction of the steel pipe, is inserted into the hollow hole 111 from inside to outside through the grouting nozzle 121 and the grout outlet nozzle 122, and after the grouting nozzle 121 and the grout outlet nozzle 122 are exposed from the hollow hole 111, girth welding is carried out at the contact part of the grouting nozzle and the grout outlet nozzle and the hollow hole, so that the semi-closed grouting sleeve connecting piece is fixed on the inner wall of the steel pipe.

As shown in fig. 6-8, the semi-enclosed grout sleeve connection has an inner diameter dimension D₁Outside diameter dimension D₂. The size of a grout outlet at the bottom of the small-diameter opening sleeve is d₀Upper inner diameter of d₁Outside diameter dimension D₁(D₂＞D₁＞d₁＞d₀). The large and small diameter open sleeves can thus nest within one another. After the sleeve is nested, as shown in fig. 8, the grout outlet of the small-diameter opening sleeve is just overlapped with the grout outlet of the semi-closed grouting sleeve connecting piece, so that the positioning and the subsequent grouting and grout outlet are facilitated.

As shown in fig. 9, the novel steel plate assembly is composed of a steel plate 21, a small-diameter opening sleeve 22 and a threaded connection steel bar 23. The cross section size of the spiral steel bar is d when the same as the inner diameter size of the bottom of the small-diameter opening sleeve₀And both areThe lines are matched with each other. The inner diameter of the threaded hole 211 on the steel plate is D as same as the outer thread 221 of the small-diameter opening sleeve₁And the threads of the two are matched with each other.

The internal threads 222 of the small diameter open sleeve are matched with the threaded connecting bars, and the threaded connecting bars 23 can be in threaded connection with the upper and lower small diameter open sleeves. The external thread 221 of the small-diameter opening sleeve is matched with the steel plate threaded hole 24, and after the small-diameter opening sleeve is in threaded connection with the steel plate through the special thread, the direction of the grout outlet 223 of the small-diameter opening sleeve is flush with the edge of the bottom edge where the small-diameter opening sleeve is located. Therefore, the small-diameter split sleeve 22 is integrally connected to the steel plate 21 and the threaded reinforcing bar 23 by the male screw 221 and the female screw 222.

As shown in fig. 10, after the TRC concrete-filled steel tube square column is connected up and down, the small-diameter opening sleeve is embedded in the prefabricated member, the connecting bottom plate assembly and the upper and lower TRC-steel tube composite confined concrete column segments are nested with each other, and only the connection of the upper and lower columns can be seen after the connection. After the connection is finished, high-performance grouting materials are adopted for grouting, and then high-performance mortar is adopted for filling gaps between the upper steel pipe and the lower steel pipe to make up the reserved gaps.

And (3) stress analysis:

the TRC shell in the assembled TRC-steel tube composite confined concrete column plays a core constraining role on the steel tube concrete column, the compression resistance of the core concrete is improved, and the compression stress born by the core concrete is sigma_rσ, as shown in FIG. 11_rThe calculation formula of (a) is as follows:

in the traditional steel pipe concrete column, only the steel pipes have the constraint effect on the core concrete, and the compressive stress born by the core concrete is sigma_r′，σ_rThe calculation formula of' is as follows:

in the above formula, n is the number of fiber woven net laying layers in the TRC prefabricated shell; f. of_fThe ultimate tensile strength of the weft carbon fiber bundles; a. the_fIs the cross-sectional area of the fiber bundle; f. of_yThe ultimate tensile strength of the weft steel pipe; a. the_nIs the cross section area of the steel pipe; s is the space between the fiber fabric grids; d_seThe side length of the core concrete.

Compared with the prior art, the core concrete with the compression resistance of the formula (1) larger than the formula (2) is the compression resistance of the core concrete in the common steel pipe concrete column, and the dual compound constraint increases the compression resistance of the core concrete.

The pull-out resistance F of the assembled TRC-steel tube composite confined concrete column₁Mainly by the adhesive force between the grouting material and the surface of the reinforcing steel barAdhesion between small-diameter opening sleeve and semi-closed grouting sleeve connecting pieceProviding a friction force F between a small diameter open sleeve and a semi-closed grout sleeve connection_sNamely:

F_s＝fl₂πD₁

(3)

the pulling resistance T of the traditional integral grouting cylinder is mainly caused by the adhesive force between grouting material and the surface of the reinforcing steel barNamely:

compared with the formula (3) which is far larger than the formula (4), the pullout resistance of the sleeve connection is superior to that of the traditional integral grouting sleeve.

The total pressure that the fabricated TRC-steel tube composite confined concrete column of the invention can bear is F₂Bearing capacity N of the concrete filled steel tubular column under compression₀And additional axial pressure bearing capacity F provided by the TRC shell restraining the steel pipe concrete column_eProviding, namely: f₂＝N₀+F_eThe bearing capacity of the common concrete-filled steel tubular column without the TRC shell is N₀Therefore, the TRC steel pipe composite confined concrete column has better compression resistance bearing capacity than the common steel pipe concrete column.

The total shearing force which can be borne by the weak surface of the assembled TRC-steel tube composite confined concrete column is V, and the shearing-resistant bearing capacity V of the small-diameter opening sleeve is mainly used₁Shear-resistant bearing capacity V of steel bar₂Providing, namely:

V＝V₁+V₂ (5)

shear force V capable of being borne by weak surface of traditional column-column connection adopting traditional integral grouting sleeve₀Shear-resisting bearing capacity V of reinforcing steel bar₂Providing, namely:

V₀＝V₂ (6)

compared with the formula (6), the formula (5) is much larger than the formula (6), namely the connection shearing capacity of the assembled TRC-steel tube composite confined concrete column is superior to that of the traditional column connection.

The concrete connection method of the assembled TRC-steel tube composite confined concrete column comprises the following steps:

s1, firstly, placing the cup mouth of the semi-closed grouting sleeve connecting piece in the steel pipe towards the outer direction of the steel pipe, inserting the semi-closed grouting sleeve connecting piece into the hollowed hole from inside to outside through a grouting nozzle and a grout outlet nozzle, after the grouting nozzle and the grout outlet nozzle are exposed out of the steel pipe, performing girth welding on the contact outer sides of the grouting nozzle and the grout outlet nozzle and the hollowed hole to fix the semi-closed grouting sleeve connecting piece on the inner wall of the steel pipe;

s4, filling core concrete in the constraint steel pipe, and pouring the concrete until the open end of the semi-closed grouting sleeve connecting piece is flush, namely the distance between the surface layer of the core concrete and the edge of the steel pipe is 1/2 of the thickness of a steel plate;

s5, coating TRCs outside the steel pipe layer by layer until the TRCs are flush with the exposed grouting nozzles and the exposed grout outlet nozzles;

s4, inserting the side, provided with the external thread, of the small-diameter opening sleeve into the threaded hole of the steel plate, and using an electric screwdriver for bolt connection to complete one-time connection of the novel steel plate assembly;

s5, connecting the novel steel plate assembly by using threaded connecting steel bars after primary connection is completed, inserting the threaded connecting steel bars into the small-diameter opening sleeve fixed on the steel plate, manually twisting the threaded connecting steel bars until the exposed lengths of the upper and lower threaded connecting steel bars are the same, completing secondary connection, completing connection of the prefabricated novel steel plate assembly, and performing factory prefabrication in the steps;

s6, after being transported to a construction site, the small-diameter open sleeve and the semi-closed grouting sleeve connecting piece are mutually nested, the steel plate is also nested in the steel pipe, the upper steel pipe and the lower steel pipe are nearly closed, and the nesting is ensured to be tight;

and S7, when connecting slurry is poured into each TRC steel tube composite confined concrete column segment, the slurry is poured into the slurry pouring nozzle until the slurry uniformly flows out of the slurry outlet nozzle, and all the slurry pouring nozzles and the slurry outlet nozzles are sealed.

The TRC steel pipe composite confined concrete column segments are connected up and down by the special steel plate through the grouting sleeve to solve the welding problem; the connecting bottom plate assembly plays a role of a stirrup and improves the plastic deformation capacity of the joint connection; the TRC shell and the constraint steel pipe improve the compression resistance of the core concrete; all components are directly prefabricated in a factory, and only positioning and installation are needed in a construction site, so that the construction time is saved, the quality problem of concrete curing in site pouring is solved, and in addition, the corrosion resistance of the components in a chloride environment is improved by the TRC shell.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.