Node structure for connecting steel pipe column and slope concrete structure and construction method

Abstract

The invention relates to the technical field of building construction, in particular to a joint structure for connecting a steel pipe column and an inclined plane concrete structure and a construction method, and the joint structure comprises a vertically arranged steel pipe concrete column, and an upper inclined beam and a lower inclined beam which are obliquely arranged relative to the steel pipe concrete column; annular concrete corbels and annular steel corbels are arranged at the joints of the upper oblique beam and the concrete filled steel tubular column and the joints of the lower oblique beam and the concrete filled steel tubular column. The annular steel corbels are arranged on the lower portions of the interiors of the annular concrete corbels. The upper oblique beam comprises a main reinforcement c, a main reinforcement d and a stirrup b, and the main reinforcement c and the main reinforcement d are connected through the stirrup b; the lower oblique beam comprises a main reinforcement a, a main reinforcement b and a stirrup b, and the main reinforcement a and the main reinforcement b are connected through the stirrup b; the main reinforcement c and the main reinforcement d are respectively bent downwards or upwards for 15 days to be anchored into the annular concrete bracket, and the main reinforcement a is bent downwards for 15 days to be anchored into the annular concrete bracket. The overall stability and safety of similar building structures such as an indoor ski field can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a node structure and a construction method for connecting a steel pipe column with a slope concrete structure. Background Art

[0002] With the development of the ice and snow economy, more and more central cities have begun to build large-scale indoor ski resorts to meet the growing enthusiasm for skiing among ice and snow sports enthusiasts.

[0003] In order to meet the functional requirements of unobstructed large space and take into account economic applicability, large indoor ski resorts generally have only a few steel tube concrete columns in the middle to support the load from the upper steel structure roof. At the same time, the lower part of the column is connected to the inclined concrete structure slide to bear the load from the local slide.

[0004] The traditional connection method between steel pipe columns and concrete beams and slabs generally includes "column wall opening and reinforcing bars + single steel bracket", that is, an H-shaped steel bracket with a length of about 500mm is set at the position of each concrete beam, and the main reinforcement of the concrete beam is anchored into the column through the reserved hole in the column wall. Although this method is conducive to the anchoring of steel bars, it has extremely high requirements for the accuracy of the three-dimensional position of the reinforcing holes of the concrete beam. It is easy to have problems such as the main reinforcement position at the beam end not matching the design state, the stirrups at the beam end cannot be closed according to the design size, and the main reinforcement of multiple concrete beams colliding in the column, resulting in difficulty in reinforcing bars. In addition, there is a certain damage to the cross-section of the steel pipe column wall. In addition, there is a method of "column wall welding sleeve connecting steel bars + single steel bracket", which is low in cost, but there is no space for welding the sleeve due to the large number of beam steel bars, and the direction of the steel bars on the arc surface of the steel pipe cylinder is inconsistent with the direction of the inclined concrete beam. There is a problem that it is difficult to smoothly connect the main reinforcement and the sleeve. At the same time, it is easily affected by construction environment factors, resulting in low connection reliability.

[0005] In view of this, how to take effective measures to solve the structural safety and construction efficiency problems of the nodes where the steel pipe columns of indoor ski resorts are connected to the sloped concrete structure is a technical problem that needs to be solved urgently in current actual construction. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings existing in the prior art, and to propose a node structure and construction method for connecting a steel pipe column with a sloped concrete structure, which can effectively improve the overall stability and safety of similar building structures such as indoor ski resorts.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A node structure in which a steel tube column is connected to an inclined concrete structure, comprising a vertically arranged steel tube concrete column, and an upper inclined beam and a lower inclined beam arranged obliquely to the steel tube concrete column; an annular concrete corbel and an annular steel corbel are provided at the connection between the upper and lower inclined beams and the steel tube concrete column, and the annular steel corbel is arranged at the inner lower part of the annular concrete corbel; the upper inclined beam comprises a main reinforcement c, a main reinforcement d and a stirrup b, and the main reinforcement c and the main reinforcement d are connected by the stirrup b; the lower inclined beam comprises a main reinforcement a, a main reinforcement b and a stirrup b, and the main reinforcement a and the main reinforcement b are connected by the stirrup b; the main reinforcement c and the main reinforcement d are respectively bent downward or upward by 15d and anchored in the annular concrete corbel, the main reinforcement a is bent downward by 15d and anchored in the annular concrete corbel, and the main reinforcement b is directly anchored in the annular concrete corbel and welded to the lower web of the annular steel corbel.

[0009] Preferably, the annular steel corbel comprises an upper web and a lower web, a plurality of ring beam ribs are arranged between the upper web and the lower web, the plurality of ring beam ribs are evenly spaced and distributed in a fan shape, and the upper web and the lower web are respectively provided with corresponding ventilation holes arranged upper and lower.

[0010] Preferably, an upper annular main reinforcement is provided at the upper part of the annular concrete corbel, a middle annular main reinforcement is provided in the middle of the annular concrete corbel, a lower annular main reinforcement (6) is provided at the bottom of the annular concrete corbel, and an annular waist reinforcement is provided at the waist of the annular concrete corbel, and the upper annular main reinforcement, the middle annular main reinforcement, the lower annular main reinforcement and the annular waist reinforcement are all connected by stirrups c.

[0011] Preferably, the inner wall of the steel tube concrete column is provided with a plurality of bolts, and three rows of bolts are added on the outer surface of the steel tube concrete column above the annular steel corbel; the internal nodes of the column body of the steel tube concrete column are provided with a transverse diaphragm with a plurality of casting holes and a stiffening ring, and a reinforced concrete core column is provided in the middle position inside the steel tube concrete column, and a steel cage is provided inside the reinforced concrete core column, which is formed by casting self-compacting concrete by the conduit method.

[0012] Preferably, the side of the annular steel corbel is also provided with a formwork reinforcement, which includes an L-shaped steel bar, a clip, a short-head steel bar, a screw rod and a formwork. The bent end of the L-shaped steel bar is welded and fixed to the steel tube concrete column, and the other end of the L-shaped steel bar is welded and connected to the screw rod. The short-head steel bar is welded and fixed to the screw rod for internal support of the formwork, and the clip is fixed to the outside of the formwork through the screw rod.

[0013] The present invention also provides a construction method for a node structure in which a steel pipe column is connected to a slope concrete structure, comprising the following steps:

[0014] Step A: Construction of concrete-filled steel tube columns

[0015] The construction process of underground steel tube concrete columns is: pouring of cushion layer → laying out and positioning → binding of foundation bottom reinforcement → installation of steel column foot → verification of steel column foot → hoisting of first section of steel column → temporary fixation of steel column → measurement and correction of steel column → binding and pouring of foundation reinforcement → hoisting of above-ground steel column;

[0016] The construction process of the above-ground steel tube concrete column is: set up the operating platform and protection → hoist and temporarily fix the steel column → measure and calibrate → inspect → weld → test → hoist the steel cage → pour concrete → hoist the next section of the steel column;

[0017] Step B: Steel bar positioning and steel bar construction of circular concrete corbel

[0018] Based on the structural characteristics, the upper surface of the node where the steel tube concrete column is connected to the upper inclined beam is an inclined surface, and the lower surface is wrapped by the circular concrete corbel as a plane. First, according to the design position of the main reinforcement and waist reinforcement in the circular concrete corbel in the drawing, the outer surface of the steel tube concrete column is marked. The identification point of the upper circular main reinforcement is the thickness of the concrete cover layer of the upper circular main reinforcement and the diameter of the upper circular main reinforcement deducted from the upper surface of the circular concrete corbel. The identification point of the lower circular main reinforcement is the thickness of the concrete cover layer and the diameter of the steel bar deducted from the lower surface of the circular concrete corbel. The identification points of the circular waist reinforcement are evenly distributed along the identification points of the upper and lower circular main reinforcements. The middle circular main reinforcement is located above the circular steel corbel. The marking point is 5 cm above the upper web of the annular steel corbel; the above-mentioned marking points are distributed in the front, back, left, right and four directions of the steel tube concrete column. Corresponding positioning steel bars a and positioning steel bars b are arranged at each marking point. The positioning steel bars a and positioning steel bars b are 20 mm in diameter steel bars and are fixed on the steel tube concrete column by welding. The length of the positioning steel bars a and positioning steel bars b is the radius of the annular concrete corbel minus the radius of the steel tube concrete column and the thickness of the concrete protective layer; the positioning steel bars b of the lower annular main bars, the middle annular main bars and the annular waist bars are welded to the steel tube concrete column in the horizontal direction according to the marking points, and the positioning steel bars a of the upper annular main bars are welded firmly along the inclined beam direction according to the marking points;

[0019] Step C: Construction of upper and lower inclined beams

[0020] First, lay the bottom formwork of the upper and lower inclined beams, and then tie the inclined beam reinforcement. The main bars c and d in the upper inclined beam of the steel tube concrete column are bent downward and upward by 15d respectively and anchored in the annular concrete corbel. The main bars a in the lower inclined beam of the steel tube concrete column are bent downward by 15d and anchored in the annular concrete corbel. The main bars b are directly anchored into the lower surface of the lower web of the annular concrete corbel. The main bars on the lower surface of the lower inclined beam are connected to the lower surface of the web by welding. Single-sided welding is adopted, and the welding length is 10d. After the main bars are tied, the construction of the inclined beam stirrup b is completed according to the drawing. The main bars are fixed to the inclined beam stirrup b by tying connection.

[0021] Step D: Construction of main reinforcement of annular concrete corbel

[0022] Mark the positions of the upper annular main reinforcement, the lower annular main reinforcement and the middle annular main reinforcement on the drawings on the positioning reinforcement a and the positioning reinforcement b respectively; when constructing the annular reinforcement, construct from top to bottom in the following order: stirrup c → inner ring annular waist reinforcement → upper annular main reinforcement → middle annular main reinforcement → lower annular main reinforcement → outer ring annular waist reinforcement;

[0023] All the circular reinforcements in the drawings are processed into two parts, circular reinforcement a and circular reinforcement b, according to the drawing dimensions. The lengths of circular reinforcement a and circular reinforcement b are both semicircular, and both ends are extended by 10d. The radius is the radius of the circular concrete corbel in the drawing minus the thickness of the concrete cover;

[0024] According to the positioning steel bars a and b in four directions of the steel tube concrete column, the annular concrete corbel is divided into four areas: the first area, the second area, the third area, and the fourth area;

[0025] In actual construction, first configure the large and small stirrups c of the same cross section into sets, place the complete sets of stirrups c in each area according to the number requirements of the drawings, and then sequentially pass the annular main reinforcements a and b through each set of stirrups in the first area, the second area, the third area, and the fourth area. The annular main reinforcements a and b are welded and fixed to the corresponding marking points on the positioning steel bars a and the positioning steel bars b, respectively. After the construction of the annular main reinforcements is completed, the annular main reinforcements a and b are welded and connected to form a closed loop with a welding length of 10d. Finally, the stirrups c are evenly distributed in a fan shape in each area according to the designed spacing, and the stirrups c are tied to the fixed annular main reinforcements, that is, the node reinforcement tying of the steel tube concrete column and the upper inclined beam and the lower inclined beam is completed;

[0026] Step E: Installation of the circular concrete corbel formwork

[0027] The annular concrete corbel is supported by a standardized formwork. The formwork reinforcement adopts a combination of steel bars + screw rods. First, a steel bar with a diameter of 16 mm is processed into an L shape. One end of the L-shaped steel bar is welded and fixed to the outer surface of the steel tube concrete column, and the other end of the L-shaped steel bar is welded and connected to the screw rod. The total length of the steel bar + screw rod combination is the radius of the annular concrete corbel minus the radius of the steel tube concrete column plus 100 mm, that is, the formwork reinforcement is exposed 100 mm outside the formwork. Short-head steel bars are welded on the inside of the formwork as internal support to prevent the formwork from shrinking. The outside is fixed with a buckle and a screw rod, thereby forming a reinforcement of the annular concrete corbel. The reinforcement is distributed in a fan shape along the center of the annular concrete corbel at a spacing of 200 mm.

[0028] After completing the above steps, pour the concrete after hidden acceptance.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention adopts a combination of "annular steel corbel + annular concrete corbel + perforation-free concrete beam steel bar anchoring", so that the ring beam corbel increases the supporting area of ​​the concrete beam, avoids damage to the column wall by opening holes, makes the force on the steel column wall more balanced, the factory processing of the steel ring beam is more conducive to quality and progress, and the on-site construction speed is fast.

[0031] 2. The perforation-free concrete beam reinforcement anchoring method of the present invention is more suitable for inclined concrete structures and is easy to control the elevation of the inclined concrete around the steel tube cylinder.

[0032] 3. The present invention uses the diaphragm inside the steel tube cylinder to play the role of compartmentalization inside the column, and enhances the column wall rigidity at the corbel node to limit the circumferential deformation. At the same time, a large number of studs on the inner wall of the steel column also limit the shrinkage of the concrete inside the column and improve the axial synergistic force performance of the steel tube and concrete.

[0033] 4. The present invention provides ventilation holes through the transverse partitions in the columns, which is beneficial to improving the density of concrete when pouring concrete in the columns, and effectively avoiding the problem of concrete being separated from the column wall or transverse partitions due to ventilation problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0035] Figure 1 It is a structural schematic diagram of a node structure in which a steel pipe column of the present invention is connected to a sloped concrete structure;

[0036] Figure 2 A three-dimensional diagram of the combination of the steel pipe column and the annular steel corbel of the present invention;

[0037] Figure 3 It is a schematic diagram of positioning steel bars of the present invention;

[0038] Figure 4 is a cross-sectional view of the annular concrete corbel of the present invention;

[0039] Figure 5 This is a schematic diagram of the connection of the annular steel bars of the present invention;

[0040] Figure 6 It is a schematic diagram of the annular concrete corbel stirrup of the present invention being tied to the welded annular main reinforcement;

[0041] Figure 7 It is a schematic diagram of the reinforcement of the annular concrete corbel formwork of the present invention.

[0042] In the figure: 1-upper inclined beam, 2-lower inclined beam, 3-steel tube concrete column, 4-stud, 5-upper annular main reinforcement, 6-lower annular main reinforcement, 7-annular steel corbel, 8-annular waist reinforcement, 9-middle annular main reinforcement, 10-cross diaphragm, 11-stirrup a, 12-stirrup b, 13-stirrup c, 14-main reinforcement a, 15-main reinforcement b, 16-main reinforcement c, 17-main reinforcement d, 18-positioning reinforcement a, 19-positioning steel Rebar b, 20-ring beam rib, 21-casting hole, 22-vent, 23-annular reinforcement a, 24-annular reinforcement b, 25-annular concrete corbel, 26-rebar cage, 27-first area, 28-second area, 29-third area, 30-fourth area, 31-shear key, 32-L-shaped reinforcement, 33-clip, 34-short head reinforcement, 35-screw, 36-formwork, 37 reinforced concrete core column. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the protection scope of the present invention. The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 7 As shown, the node structure of the steel tube column of the present invention connected to the sloped concrete structure includes a vertically arranged steel tube concrete column 3, and an upper inclined beam 1 and a lower inclined beam 2 inclined to the steel tube concrete column 3; the connection between the upper inclined beam 1 and the lower inclined beam 2 and the steel tube concrete column 3 is provided with an annular concrete corbel 25 and an annular steel corbel 7, and the annular steel corbel 7 is arranged at the lower inside of the annular concrete corbel 25.

[0045] The upper inclined beam 1 includes main reinforcement c16, main reinforcement d17 and stirrup b12, and the main reinforcement c16 and the main reinforcement d17 are connected by stirrup b12; the lower inclined beam 2 includes main reinforcement a14, main reinforcement b15 and stirrup b12, and the main reinforcement a14 and the main reinforcement b15 are connected by stirrup b12.

[0046] The main reinforcement c16 and main reinforcement d17 are bent downward or upward by 15d and anchored in the annular concrete corbel 25 respectively, the main reinforcement a14 is bent downward by 15d and anchored in the annular concrete corbel 25, and the main reinforcement b15 is directly anchored in the annular concrete corbel 25 and welded to the lower web of the annular steel corbel 7.

[0047] In this embodiment, the combined ring beam bracket of "ring steel bracket + ring concrete bracket + non-perforated concrete beam reinforcement anchor" is used to increase the supporting area of ​​the concrete beam, avoid damage to the opening of the column wall, make the force on the steel column wall more balanced, and the factory processing of the steel ring beam is more conducive to quality and progress, and the on-site construction speed is fast. Among them, the non-perforated concrete beam reinforcement anchoring method is more suitable for inclined concrete structures, and it is easy to control the elevation of the inclined concrete around the steel tube cylinder.

[0048] Specifically, the annular steel corbel 7 includes an upper web and a lower web, a plurality of ring beam ribs 20 are arranged between the upper web and the lower web, the plurality of ring beam ribs 20 are evenly spaced and distributed in a fan shape, and the upper web and the lower web are respectively provided with corresponding ventilation holes 22 arranged up and down.

[0049] In this embodiment, the provision of ventilation holes is helpful to improve the density of concrete when pouring concrete in the column, and effectively avoids the problem of concrete being detached from the column wall or the cross partition due to ventilation problems.

[0050] Specifically, an upper annular main reinforcement 5 is provided at the upper part of the annular concrete corbel 25, a middle annular main reinforcement 9 is provided in the middle of the annular concrete corbel 25, a lower annular main reinforcement 6 is provided at the bottom of the annular concrete corbel 25, and an annular waist reinforcement 8 is provided at the waist of the annular concrete corbel 25, and the upper annular main reinforcement 5, the middle annular main reinforcement 9, the lower annular main reinforcement 6 and the annular waist reinforcement 8 are all connected by stirrups c13. In actual application, stirrups a11 are provided on part of the lower annular main reinforcement 6 to be welded to the lower web of the annular steel corbel 7.

[0051] Specifically, in actual application, the diameter of the steel tube concrete column 3 is 1800mm, the wall thickness is 50mm, the inner wall of the steel tube concrete column 3 is provided with a plurality of 80mm bolts 4, and three rows of bolts 4 are added on the outer surface of the steel tube concrete column 3 above the annular steel corbel 25 to increase the bond strength between the concrete and the steel tube column at the node. The concrete grade in the steel tube concrete column 3 is C50; the internal nodes of the steel tube concrete column 3 are provided with a plurality of bolts 4. The diaphragm 10 and the shear key 31 of the casting hole 21 are made of Q345GJC. The shear key 31 is a round steel bar with a diameter of 25, which is fixed to the inner wall of the steel tube concrete column 3 by welding. The steel tube concrete column 3 is provided with a reinforced concrete core column 37 with a diameter of 800mm. The reinforced concrete core column 37 is provided with a steel cage 26. The main reinforcement of the steel cage 26 is 12Φ25, and the stirrup is Φ8@200, both of which are HRB400 grade.

[0052] In this embodiment, in actual application, for circular steel tube concrete components with a diameter greater than 1.8m, effective measures should be taken to reduce the impact of the shrinkage of the concrete in the steel tube on the stress performance of the component. Because when the diameter of the steel tube is too large, the shrinkage of the concrete in the tube will cause the steel tube to separate from the concrete, affecting the joint stress of the steel tube and concrete. The transverse partition inside the steel tube cylinder of the present invention plays the role of dividing the column, and enhances the column wall stiffness at the corbel node to limit the circumferential deformation. At the same time, the large number of bolts on the inner wall of the steel column also limit the shrinkage of the concrete in the column, and improve the axial coordinated stress performance of the steel tube and concrete.

[0053] Specifically, the side of the annular steel corbel 7 is also provided with a template reinforcement, which includes an L-shaped steel bar 32, a clip 33, a short-head steel bar 34, a screw rod 35 and a template 36. The bent end of the L-shaped steel bar 32 is welded and fixed to the steel tube concrete column 3, and the other end of the L-shaped steel bar 32 is welded and connected to the screw rod 35. The short-head steel bar 34 is welded and fixed to the screw rod 35 for internal support of the template. The clip 33 is fixed to the outside of the template 36 through the screw rod 35, thereby forming a reinforcement system for the entire annular template.

[0054] In this embodiment, by combining an innovative combination of steel bars and screw rods and reinforcing the outer mold on one side, the dual functions of internal support and reinforcement of the mold are achieved, thereby ensuring the molding quality of the concrete.

[0055] Accordingly, the construction method of the node structure in which the steel pipe column is connected to the slope concrete structure of the present invention comprises the following steps:

[0056] Step A: Construction of Concrete-Filled Steel Tube Column 3

[0057] The construction process of the underground steel tube concrete column 3 is: pouring of cushion layer → laying out and positioning → binding of foundation bottom reinforcement → installation of steel column foot → verification of steel column foot → hoisting of the first section of steel column → temporary fixation of steel column → measurement and correction of steel column → binding and pouring of foundation reinforcement → hoisting of the above-ground steel column;

[0058] The construction process of the above-ground steel tube concrete column 3 is: erecting the operating platform and protection → hoisting and temporary fixing of the steel column → measuring and correcting → inspection → welding → testing → hoisting of the steel cage 26 → concrete pouring → hoisting of the next section of the steel column;

[0059] Step B: Steel bar positioning steel bar construction of annular concrete corbel 25

[0060] Based on the structural characteristics, the upper surface of the node where the steel tube concrete column 3 is connected to the upper inclined beam 1 is an inclined surface, and the lower surface is wrapped by the annular concrete corbel 25 as a plane. First, according to the design positions of the main reinforcement and waist reinforcement in the annular concrete corbel 25 in the drawing, the outer surface of the steel tube concrete column 3 is marked, wherein the marking point of the upper annular main reinforcement 5 is the thickness of the concrete protective layer of the upper annular main reinforcement 5 and the diameter of the upper annular main reinforcement 5 deducted from the upper surface of the annular concrete corbel 25, the marking point of the lower annular main reinforcement 6 is the thickness of the concrete protective layer of the lower surface of the annular concrete corbel 25 deducted from the diameter of the steel bar, the marking point of the annular waist reinforcement 8 is evenly distributed along the marking points of the upper annular main reinforcement 5 and the lower annular main reinforcement 6, and the marking point of the middle annular main reinforcement 9 is evenly distributed along the marking points of the upper annular main reinforcement 5 and the lower annular main reinforcement 6. Located above the annular steel corbel 7, its marking point is 5 cm above the upper web of the annular steel corbel 7; the positioning steel bars a18 and the positioning steel bars b19 are distributed in the front, back, left, and right directions of the steel tube concrete column 3, and are fixed on the steel tube concrete column 3 by welding using steel bars with a diameter of 20 mm. The lengths of the positioning steel bars a18 and the positioning steel bars b19 are the radius of the annular concrete corbel 25 minus the radius of the steel tube concrete column 3 and the thickness of the concrete protective layer; the positioning steel bars b19 of the lower annular main reinforcement 6, the middle annular main reinforcement 9 and the annular waist reinforcement 8 are all welded to the steel tube concrete column 3 in the horizontal direction according to the marking point, and the positioning steel bars a18 of the upper annular main reinforcement 5 are firmly welded along the inclined beam direction according to the marking point;

[0061] Step C: Construction of upper inclined beam 1 and lower inclined beam 2

[0062] First, lay the bottom formwork of the upper inclined beam 1 and the lower inclined beam 2, and then tie the inclined beam reinforcement. The main reinforcement c16 and the main reinforcement d17 in the upper inclined beam 1 of the steel tube concrete column 3 are bent downward and upward by 15d respectively and anchored in the annular concrete corbel 25. The main reinforcement a14 in the lower inclined beam 2 of the steel tube concrete column 3 is bent downward by 15d and anchored in the annular concrete corbel 25. The main reinforcement b15 is directly anchored into the lower surface of the lower web of the annular concrete corbel 25. The main reinforcement on the lower surface of the lower inclined beam 2 is connected to the lower surface of the web by welding. Single-sided welding is adopted, and the welding length is 10d. After the main reinforcement is tied, the construction of the inclined beam stirrup b12 is completed according to the drawing, and the main reinforcement is fixed to the inclined beam stirrup b12 by tying connection;

[0063] Step D: Construction of main reinforcement of annular concrete corbel 25

[0064] Mark the positions of the upper annular main reinforcement 5, the lower annular main reinforcement 6 and the middle annular main reinforcement 9 on the drawings on the positioning reinforcement a18 and the positioning reinforcement b19 respectively; when constructing the annular reinforcement, construct from top to bottom in the following order: stirrup c13 → inner ring annular waist reinforcement 8 → upper annular main reinforcement 5 → middle annular main reinforcement 9 → lower annular main reinforcement 6 → outer ring annular waist reinforcement 8;

[0065] All the circular reinforcements in the drawings are processed into two parts, circular reinforcement a23 and circular reinforcement b24, according to the drawing dimensions. The lengths of circular reinforcement a23 and circular reinforcement b24 are both semicircular, and both ends are extended by 10d. The radius is the radius of the circular concrete corbel 25 in the drawings minus the thickness of the concrete cover.

[0066] According to the positioning steel bars a18 and the positioning steel bars b19 in four directions of the steel tube concrete column 3, the annular concrete corbel 25 is divided into four areas, namely, a first area 27, a second area 28, a third area 29, and a fourth area 30;

[0067] In actual construction, first configure the large and small stirrups c13 of the same cross section into sets, and place the complete sets of stirrups c13 in each area according to the number requirements of the drawings, and then sequentially pass the annular main reinforcements a23 and b24 through each set of stirrups 13 in the first area 27, the second area 28, the third area 29, and the fourth area 30, and weld and fix the annular main reinforcements a23 and b24 to the corresponding marking points on the positioning steel bars a18 and the positioning steel bars b19, respectively. After all the construction of the annular main reinforcements is completed, the annular main reinforcements a23 and b24 are welded and connected to form a closed loop, and the welding length is 10d. Finally, the stirrups c13 are evenly distributed in a fan shape in each area according to the designed spacing, and the stirrups c13 are tied to the fixed annular main reinforcements, that is, the node reinforcement binding of the steel tube concrete column 3 and the upper inclined beam 1 and the lower inclined beam 2 is completed;

[0068] Step E: Installation of the Circular Concrete Corbel 25 Formwork

[0069] The annular concrete corbel 25 is supported by a standardized template 36. The template reinforcement member adopts a combination of steel bars + screw rods. First, a steel bar with a diameter of 16 mm is processed into an L shape. One end of the L-shaped steel bar 32 is welded and fixed to the outer surface of the steel tube concrete column 3, and the other end of the L-shaped steel bar 32 is welded and connected to the screw rod 35. The total length of the steel bar + screw rod combination is the radius of the annular concrete corbel 25 minus the radius of the steel tube concrete column 3 plus 100 mm, that is, the template reinforcement member is exposed by the template 36100 mm. Short-head steel bars 34 are welded on the inside of the template as an inner support to prevent the template from shrinking. The outside is fixed with a buckle 33 and a screw rod 35, thereby forming a reinforcement member of the annular concrete corbel 25. The reinforcement member is distributed in a fan shape along the center of the annular concrete corbel 25 at a spacing of 200 mm.

[0070] After completing the above steps, pour the concrete after hidden acceptance.

[0071] In summary, the present invention adopts a combination of "annular steel corbel + annular concrete corbel + perforation-free concrete beam reinforcement anchor", so that the corbel of the ring beam increases the supporting area of ​​the concrete beam, avoids damage to the opening of the column wall, makes the force on the steel column wall more balanced, and the factory processing of the steel ring beam is more conducive to quality and progress, and the on-site construction speed is fast. The present invention effectively improves the overall stability and safety of similar building structures such as indoor ski resorts, and is particularly suitable for the node structure and construction method of independent ultra-high large-diameter steel pipe columns connected to inclined concrete structures in large indoor ski resorts.

[0072] The description and practice disclosed in the present invention are easy to think and understand for ordinary technicians in the technical field, and several improvements and modifications can be made without departing from the principles of the present invention. Therefore, modifications or improvements made without departing from the spirit of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A node structure connecting a steel pipe column and a sloped concrete structure, characterized in that: The invention comprises a vertically arranged steel tube concrete column (3), and an upper inclined beam (1) and a lower inclined beam (2) arranged obliquely with the steel tube concrete column (3); an annular concrete corbel (25) and an annular steel corbel (7) are provided at the connection between the upper inclined beam (1) and the lower inclined beam (2) and the steel tube concrete column (3); the annular steel corbel (7) is arranged at the lower part of the inner part of the annular concrete corbel (25); The upper inclined beam (1) comprises a main reinforcement c (16), a main reinforcement d (17) and a stirrup b (12), wherein the main reinforcement c (16) and the main reinforcement d (17) are connected by the stirrup b (12); the lower inclined beam (2) comprises a main reinforcement a (14), a main reinforcement b (15) and a stirrup b (12), wherein the main reinforcement a (14) and the main reinforcement b (15) are connected by the stirrup b (12); The main reinforcement c (16) and the main reinforcement d (17) are respectively bent 15d downward or upward and anchored in the annular concrete corbel (25); the main reinforcement a (14) is bent 15d downward and anchored in the annular concrete corbel (25); the main reinforcement b (15) is directly anchored in the annular concrete corbel (25) and welded to the lower web of the annular steel corbel (7).

2. The node structure of the steel pipe column connected to the sloped concrete structure according to claim 1 is characterized in that: The annular steel corbel (7) comprises an upper web and a lower web, a plurality of ring beam ribs (20) are arranged between the upper web and the lower web, the plurality of ring beam ribs (20) are evenly spaced and distributed in a fan shape, and the upper web and the lower web are respectively provided with ventilation holes (22) arranged correspondingly in the upper and lower directions.

3. The node structure of the steel pipe column connected to the slope concrete structure according to claim 1 is characterized in that: An upper annular main reinforcement (5) is provided at the upper part of the annular concrete corbel (25), a middle annular main reinforcement (9) is provided in the middle of the annular concrete corbel (25), a lower annular main reinforcement (6) is provided at the bottom of the annular concrete corbel (25), and an annular waist reinforcement (8) is provided at the waist of the annular concrete corbel (25), and the upper annular main reinforcement (5), the middle annular main reinforcement (9), the lower annular main reinforcement (6) and the annular waist reinforcement (8) are all connected by stirrups c (13).

4. The node structure of connecting the steel pipe column and the sloped concrete structure according to claim 1 is characterized in that: The inner wall of the steel tube concrete column (3) is provided with a plurality of bolts (4), and three rows of bolts (4) are additionally provided on the outer surface of the steel tube concrete column (3) above the annular steel bracket (25); a transverse diaphragm (10) with a plurality of casting holes (21) and a stiffening ring (31) are provided at the internal nodes of the column body of the steel tube concrete column (3); a reinforced concrete core column (37) is provided at the middle position inside the steel tube concrete column (3), and a steel cage (26) is provided inside the reinforced concrete core column (37).

5. The node structure of connecting the steel pipe column and the sloped concrete structure according to claim 1 is characterized in that: The side of the annular steel bracket (7) is also provided with a template reinforcement part, which includes an L-shaped steel bar (32), a buckle (33), a short-head steel bar (34), a screw rod (35) and a template (36). The bent end of the L-shaped steel bar (32) is welded and fixed to the steel tube concrete column (3), and the other end of the L-shaped steel bar (32) is welded and connected to the screw rod (35). The short-head steel bar (34) and the screw rod (35) are welded and fixed to the inner support of the template. The buckle (33) is fixed to the outer side of the template (36) through the screw rod (35).

6. The construction method of the node structure of the steel pipe column connected to the slope concrete structure according to any one of claims 1 to 5, characterized in that: The steps include: Step A: Construction of Concrete-Filled Steel Tube Column (3) The construction process of underground steel tube concrete column (3) is as follows: pouring of cushion layer → laying out and positioning → tying of foundation bottom reinforcement → installation of steel column foot → verification of steel column foot → hoisting of first section of steel column → temporary fixation of steel column → measurement and correction of steel column → tying and pouring of foundation reinforcement → hoisting of above-ground steel column; The construction process of the above-ground steel tube concrete column (3) is: setting up the operating platform and protection → hoisting and temporary fixing of the steel column → measuring and correcting → inspection → welding → testing → hoisting of the steel cage (26) → concrete pouring → hoisting of the next section of the steel column; Step B: Steel bar positioning steel bar construction of the annular concrete corbel (25) Based on the structural characteristics, the upper surface of the node where the steel tube concrete column (3) is connected to the upper inclined beam (1) is an inclined surface, and the lower surface is wrapped by the annular concrete corbel (25) as a plane. First, according to the design positions of the main reinforcement and waist reinforcement in the annular concrete corbel (25) in the drawing, the outer surface of the steel tube concrete column (3) is marked, wherein the marking point of the upper annular main reinforcement (5) is the thickness of the concrete protective layer of the upper annular main reinforcement (5) and the diameter of the upper annular main reinforcement (5) deducted from the upper surface of the annular concrete corbel (25), the marking point of the lower annular main reinforcement (6) is the thickness of the concrete protective layer and the diameter of the steel bar deducted from the lower surface of the annular concrete corbel (25), the marking point of the annular waist reinforcement (8) is evenly distributed along the marking points of the upper annular main reinforcement (5) and the lower annular main reinforcement (6), and the middle annular main reinforcement (9) is located above the annular steel corbel (7), and its marking point is an annular 5 cm above the upper web of the steel corbel (7); the above-mentioned marking points are arranged in the front, back, left, right and four directions of the steel tube concrete column (3), and each marking point is arranged with a corresponding positioning steel bar a (18) and positioning steel bar b (19). The positioning steel bar a (18) and positioning steel bar b (19) are made of steel bars with a diameter of 20 mm and are fixed to the steel tube concrete column (3) by welding. The length of the positioning steel bar a (18) and positioning steel bar b (19) is the radius of the annular concrete corbel (25) minus the radius of the steel tube concrete column (3) and the thickness of the concrete protective layer; wherein the positioning steel bar b (19) of the lower annular main reinforcement (6), the middle annular main reinforcement (9) and the annular waist reinforcement (8) are all welded to the steel tube concrete column (3) in the horizontal direction according to the marking points, and the positioning steel bar a (18) of the upper annular main reinforcement (5) is firmly welded along the inclined beam direction according to the marking points; Step C: Construction of upper inclined beam (1) and lower inclined beam (2) First, the bottom formwork of the upper inclined beam (1) and the lower inclined beam (2) is laid, and then the inclined beam reinforcement is tied. The main reinforcement c (16) and the main reinforcement d (17) in the upper inclined beam (1) of the steel tube concrete column (3) are bent downward and upward by 15d respectively and anchored in the annular concrete corbel (25). The main reinforcement a (14) in the lower inclined beam (2) of the steel tube concrete column (3) is bent downward by 15d and anchored in the annular concrete corbel (25). The main reinforcement b (15) is directly anchored into the lower surface of the lower web of the annular concrete corbel (25). The main reinforcement on the lower surface of the lower inclined beam (2) is connected to the lower surface of the web by welding. Single-sided welding is adopted, and the welding length is 10d. After the main reinforcement is tied, the inclined beam stirrup b (12) is constructed according to the drawing. The main reinforcement is connected and fixed to the inclined beam stirrup b (12) by tying. Step D: Construction of main reinforcement of annular concrete corbel (25) The positions of the upper annular main reinforcement (5), the lower annular main reinforcement (6) and the middle annular main reinforcement (9) on the drawings are marked on the positioning reinforcement a (18) and the positioning reinforcement b (19). When the annular reinforcement is constructed, the construction is carried out from top to bottom in the following order: stirrup c (13) → inner ring annular waist reinforcement (8) → upper annular main reinforcement (5) → middle annular main reinforcement (9) → lower annular main reinforcement (6) → outer ring annular waist reinforcement (8); All the circular reinforcements in the drawings are processed into two parts, circular reinforcement a (23) and circular reinforcement b (24), according to the dimensions in the drawings. The lengths of the circular reinforcement a (23) and circular reinforcement b (24) are both semicircular, and both ends are extended by 10d. The radius is the radius of the circular concrete corbel (25) in the drawings minus the thickness of the concrete cover. According to the positioning steel bars a (18) and the positioning steel bars b (19) in four directions of the steel tube concrete column (3), the annular concrete corbel (25) is divided into four areas, namely, a first area (27), a second area (28), a third area (29), and a fourth area (30); During actual construction, large and small stirrups c (13) of the same cross section are first arranged in sets, and the complete set of stirrups c (13) is placed in each area according to the number requirements of the drawings. Then, the annular main reinforcement a (23) and the annular main reinforcement b (24) are passed through each set of stirrups (13) in the first area (27), the second area (28), the third area (29), and the fourth area (30) in turn. The annular main reinforcement a (23) and the annular main reinforcement b (24) are respectively welded and fixed to the marking points on the corresponding positioning steel bars a (18) and the positioning steel bars b (19). After the construction of the annular main reinforcement is completed, the annular main reinforcement a (23) and the annular main reinforcement b (24) are welded and connected to form a closed loop, and the welding length is 10d. Finally, the stirrups c (13) are evenly distributed in a fan shape in each area according to the designed spacing, and the stirrups c (13) are tied to the fixed annular main reinforcement, so that the node reinforcement binding of the steel tube concrete column (3) and the upper inclined beam (1) and the lower inclined beam (2) is completed. Step E: Installation of the template for the annular concrete corbel (25) A standardized template (36) is used to support the annular concrete corbel (25). The template reinforcement member adopts a combination of steel bars + screw rods. First, a steel bar with a diameter of 16 mm is processed into an L shape. One end of the L-shaped steel bar (32) is welded and fixed to the outer surface of the steel tube concrete column (3). The other end of the L-shaped steel bar (32) is welded and connected to the screw rod (35). The total length of the steel bar + screw rod combination is the radius of the annular concrete corbel (25) minus the radius of the steel tube concrete column (3) plus 100 mm, that is, the template reinforcement member is exposed outside the template (36) by 100 mm. A short-head steel bar (34) is welded on the inner side of the template as an inner support to prevent the template from shrinking. The outer side is fixed with a buckle (33) and the screw rod (35). Thus, a reinforcement member of the annular concrete corbel (25) is formed. The reinforcement member is distributed in a fan shape along the center of the annular concrete corbel (25) at a spacing of 200 mm. After completing the above steps, pour the concrete after hidden acceptance.

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