A connection node between a prefabricated hollow column and a frame beam and a construction method thereof

Abstract

The present invention discloses a connection node between a prefabricated hollow column and a frame beam and a construction method thereof. The connection node includes an upper connecting steel cylinder, a lower connecting steel cylinder, a prefabricated hollow column and a frame beam. The upper connecting steel cylinder and the lower connecting steel cylinder are respectively fixed to the ends of the prefabricated hollow columns on the upper and lower sides of the beam-column core area. A steel hoop is provided at the bottom of the lower connecting steel cylinder. The bottom end of the steel hoop is correspondingly arranged at the top of the beam-column core area. The openings of the upper connecting steel cylinder and the lower connecting steel cylinder are opposite and welded closed at the joint. Grouting holes are provided on the sealing plates of the upper connecting steel cylinder and the lower connecting steel cylinder. The internal cavity of the prefabricated hollow column, the abdominal cavity between the upper connecting steel cylinder and the lower connecting steel cylinder, and the internal space of the steel hoop and the beam-column core area are filled with concrete. The present invention can not only stagger the connection of the column longitudinal reinforcement from the beam-column core area, avoid the connection of the column longitudinal reinforcement one by one in the beam-column core area with a narrow construction space, but also ensure the through arrangement of the column longitudinal reinforcement in the beam-column core area, facilitate construction and be efficient, and ensure reliable connection quality.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated building construction, and in particular to a connection node between a prefabricated hollow column and a frame beam and a construction method thereof. Background Art

[0002] Prefabricated concrete frame structures are one of the main forms of prefabricated buildings and a new type of green construction method. The nodes of prefabricated concrete frame structures are a key link in project quality control. The connection nodes of reinforced concrete frame structures are where the upper and lower frame columns, frame beams, and floor slabs intersect. During the structural design process, reinforcement is generally required. Therefore, the steel bars at the frame structure nodes are very densely crisscrossed. As a prefabricated concrete frame structure, prefabricated frame columns, prefabricated frame beams, prefabricated floor slabs and other components all have reserved steel bars. How to gather these steel bars in one place without mutual collision and to bear reasonable loads is a major issue that must be considered. It is also the primary issue that needs to be urgently resolved during factory prefabrication and on-site lifting and assembly construction. Due to the dense steel bars in the node area, when the longitudinal bars of the prefabricated frame columns are connected one by one through sleeve grouting in the node, there are often problems such as small construction space, high connection difficulty, low construction efficiency, and difficulty in ensuring construction quality. Summary of the Invention

[0003] The present invention aims to provide a connection node between a prefabricated hollow column and a frame beam and a construction method thereof, so as to solve the technical problems described in the background technology.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0005] A connection node between a prefabricated hollow column and a frame beam and a construction method thereof, comprising an upper connecting steel cylinder, a lower connecting steel cylinder, a prefabricated hollow column, and a frame beam. The cross-sectional shapes of the upper connecting steel cylinder and the lower connecting steel cylinder both match the cross-sectional shapes of the prefabricated hollow column, and the upper and lower connecting steel cylinders are respectively fixed to the ends of the longitudinal reinforcement joint sections of the prefabricated hollow columns on the upper and lower sides of the beam-column core area.

[0006] A connecting steel is embedded at the bottom of the prefabricated hollow column in the upper part of the core area of ​​the beam and column, and the end of the connecting steel is welded to the cover plate of the upper connecting steel cylinder;

[0007] The column longitudinal reinforcement spurt section in the prefabricated hollow column below the beam-column core area vertically penetrates the beam-column core area and extends to the top of the beam-column core area, and diagonal bracing steel bars are fixedly arranged between the column longitudinal reinforcements in the beam-column core area;

[0008] The column stirrups at the ends of the prefabricated hollow columns and in the core areas of the beams and columns are densely arranged;

[0009] The peripheral wall of the lower connecting steel cylinder extends beyond the bottom sealing plate to form a steel hoop, and the bottom end of the steel hoop is correspondingly arranged at the top of the core area of ​​the beam column. The openings of the upper connecting steel cylinder and the lower connecting steel cylinder are opposite to each other and welded closed at the joint;

[0010] Grouting holes are opened on the sealing plates of the upper connecting steel cylinder and the lower connecting steel cylinder. The grouting holes connect the internal cavity of the prefabricated hollow column, the abdominal cavity between the upper connecting steel cylinder and the lower connecting steel cylinder, and the internal space of the steel hoop and the core area of ​​the beam and column. The internal cavity of the prefabricated hollow column, the abdominal cavity between the upper connecting steel cylinder and the lower connecting steel cylinder, and the internal space of the steel hoop and the core area of ​​the beam and column are all filled with concrete.

[0011] Preferably, additional steel bars are provided on the top of the prefabricated hollow column at the lower part of the beam-column core area. The additional steel bars are arranged correspondingly on the inner side of the column longitudinal bars. One end of the steel bar is embedded in the concrete of the prefabricated hollow column, and the other end vertically passes through the beam-column core area and is fixed on the lower connecting steel cylinder.

[0012] Preferably, an anchor plate is fixedly provided at one end of the additional steel bar embedded in the prefabricated hollow column.

[0013] Preferably, the connecting steel is a cross-shaped steel with flanges, and the setting height of the cross-shaped steel with flanges is not less than half of the long side dimension of the prefabricated hollow column section.

[0014] Preferably, the length of the column stirrup densification section is not less than the long side dimension of the prefabricated hollow column cross section.

[0015] Preferably, the total height of the upper connecting steel cylinder and the lower connecting steel cylinder is 20-100 cm.

[0016] Preferably, the height of the steel hoop is 2-20 cm.

[0017] In addition, the present invention also provides a construction method for the connection node between the prefabricated hollow column and the frame beam, comprising the following steps:

[0018] Step 1: Make a prefabricated hollow column and fix the diagonal bracing steel bars, upper connecting steel cylinder and lower connecting steel cylinder in advance at the column longitudinal reinforcement joint section;

[0019] Step 2: Install the prefabricated hollow column at the lower part of the core area of ​​the beam and column, wet the inner cavity of the prefabricated hollow column with water, and pour concrete from the top of the prefabricated hollow column into the inner cavity;

[0020] Step 3: construct frame beams;

[0021] Step 4: Hoist the prefabricated hollow column at the upper part of the core area of ​​the beam and column into place, aligning the openings of the upper connecting steel cylinder with the lower connecting steel cylinder;

[0022] Step 5: Check the position of the prefabricated hollow column at the upper part of the core area of ​​the beam and column, and weld the upper connecting steel cylinder and the lower connecting steel cylinder at the joint between them;

[0023] Step 6: Support the formwork of the core area of ​​beams and columns;

[0024] Step 7: Sprinkle water to moisten the inner cavity of the prefabricated hollow column above the core area of ​​the beam and column, and pour concrete from the top of the prefabricated hollow column into its inner cavity. The concrete flows from the grouting hole into the abdominal cavity between the upper connecting steel cylinder and the lower connecting steel cylinder, as well as the steel hoop and the inner space of the beam and column core area, and the inner cavity of the prefabricated hollow column, the abdominal cavity between the upper connecting steel cylinder and the lower connecting steel cylinder, and the steel hoop and the inner space of the beam and column core area are poured densely.

[0025] Step 8: After the concrete in the core area of ​​the beam and column reaches the preset strength, the formwork is removed and the next prefabricated hollow column is hoisted.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention realizes the effective connection of the upper and lower prefabricated hollow column longitudinal reinforcements in the core area of ​​the beam and column by welding the upper connecting steel cylinder and the lower connecting steel cylinder connected, which can not only stagger the connection of the column longitudinal reinforcements in the core area of ​​the beam and column, avoiding the one-by-one connection of the column longitudinal reinforcements in the core area of ​​the beam and column with a narrow construction space, but also ensure the through arrangement of the column longitudinal reinforcements in the core area of ​​the beam and column. The closed abdominal cavity of the upper connecting steel cylinder and the lower connecting steel cylinder, the internal cavity of the prefabricated hollow column and the core area of ​​the beam and column are integrally grouted by cast-in-place concrete, which makes the construction convenient and efficient, and the connection quality reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or other aspects and advantages of the present invention will become clearer and more easily understood through the detailed description made in conjunction with the following drawings, which are only illustrative and do not limit the present invention, wherein:

[0028] Figure 1 This is a schematic diagram of the longitudinal section structure of a connection node between a prefabricated hollow column and a frame beam according to the present invention;

[0029] Figure 2 This is a schematic diagram of the longitudinal section structure of the prefabricated hollow column involved in the present invention;

[0030] Figure 3 This is a schematic diagram of the cross-sectional structure of the prefabricated hollow column involved in the present invention;

[0031] Figure 4 It is a structural schematic diagram of the connecting steel and the upper connecting steel cylinder involved in the present invention;

[0032] Figure 5 This is a structural schematic diagram of the lower connecting steel cylinder and additional steel bars involved in the present invention.

[0033] Figure numerals: 1. Prefabricated hollow column; 101. Column longitudinal reinforcement; 102. Column stirrups; 2. Frame beam; 201. Beam main reinforcement; 202. Beam stirrups; 3. Upper connecting steel cylinder; 4. Lower connecting steel cylinder; 5. Connecting steel; 6. Steel hoop; 7. Grouting hole; 8. Additional reinforcement; 9. Anchor plate; 10. Nut; 11. Diagonal bracing reinforcement. DETAILED DESCRIPTION

[0034] Hereinafter, an embodiment of a connection node between a prefabricated hollow column and a frame beam and a construction method thereof of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention. They are all illustrative and exemplary and should not be interpreted as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and description of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments described herein.

[0035] In the description of the present invention, it should be noted that the terms "front," "back," "left," "right," "top," "bottom," "upper," "lower," "inner," "outer," "horizontal," and "vertical" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] The drawings in this specification are schematic diagrams that assist in illustrating the concepts of the present invention and schematically illustrate the shapes of the various components and their interrelationships. Please note that to clearly illustrate the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. The same reference numerals are used to indicate the same parts.

[0037] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. Figure 1-5 , the preferred embodiments of the present invention are further described in detail:

[0038] like Figure 1-5As shown, a preferred connection node of a prefabricated hollow column and a frame beam of the present invention comprises an upper connecting steel cylinder 3, a lower connecting steel cylinder 4, a prefabricated hollow column 1 and a frame beam 2. The cross-sectional shapes of the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 are matched with the cross-sectional shape of the prefabricated hollow column 1, and the two are respectively fixed to the ends of the column longitudinal reinforcement 101 of the prefabricated hollow column 1 on the upper and lower sides of the beam-column core area. A threaded section is provided at the end of the column longitudinal reinforcement 101, which passes through the sealing plate of the upper connecting steel cylinder 3 or the lower connecting steel cylinder 4 and is locked by a nut 10. Of course, a pad can also be added between the nut 10 and the sealing plate;

[0039] like Figure 4 As shown, a connecting steel 5 is embedded at the bottom end of the upper prefabricated hollow column 1 in the core area of ​​the beam and column. The connecting steel 5 is preferably a cross-shaped steel with a flange. The setting height of the cross-shaped steel with a flange is not less than half of the long side size of the cross section of the prefabricated hollow column 1. The flange of the cross-shaped steel with a flange is embedded in the concrete outside the internal cavity of the prefabricated hollow column 1, and its end is welded to the cover plate of the upper connecting steel cylinder 3. The gap in the abdominal cavity of the cross-shaped steel with a flange can ensure that the internal cavity of the prefabricated hollow column 1 can be connected to the grouting hole 7 opened on the upper connecting steel cylinder 3. The setting of the cross-shaped steel with a flange can effectively enhance the connection strength between the upper connecting steel cylinder 3 and the prefabricated hollow column 1.

[0040] The longitudinal reinforcement 101 in the prefabricated hollow column 1 at the lower part of the beam-column core area is vertically penetrated through the beam-column core area and extends to the top of the beam-column core area. The diagonal bracing steel bars 11 are fixedly arranged between the longitudinal reinforcement 101 in the beam-column core area by welding or binding. The arrangement of the diagonal bracing steel bars 11 is mainly to improve the shear strength of the beam-column core area.

[0041] like Figure 5 As shown, an additional steel bar 8 is provided on the top of the prefabricated hollow column 1 at the lower part of the core area of ​​the beam and column. The additional steel bar 8 is correspondingly arranged on the inner side of the column longitudinal reinforcement 101 to avoid the dense column longitudinal reinforcement 101. One end of the reinforcement body is embedded in the concrete of the prefabricated hollow column 1, and the other end vertically penetrates the core area of ​​the beam and column and is fixed to the lower connecting steel cylinder 4 through the end thread and nut 10. In order to improve the bonding strength between the additional steel bar 8 and the prefabricated hollow column 1, an anchor plate 9 is preferably fixed at the end of the additional steel bar 8 embedded in the prefabricated hollow column 1.

[0042] The column stirrups 102 at the end of the prefabricated hollow column 1 and the core area of ​​the beam and column are all densely arranged, and the length of the dense section of the column stirrups 102 is not less than the long side dimension of the cross section of the prefabricated hollow column 1. The dense column stirrups 102 can also improve the structural strength of the beam-column connection node to a certain extent;

[0043] The peripheral wall of the lower connecting steel cylinder 4 exceeds its bottom sealing plate by a distance to form a steel hoop 6, and the bottom end of the steel hoop 6 is correspondingly arranged at the top of the core area of ​​the beam column, the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 are opened relative to each other and are closed by slope welding at the joint, the total height of the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 is 20-100 cm, and the joint between the two may be in the middle position or not in the middle position, that is, the setting height of the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 may be the same or different, and the setting of the steel hoop 6 is to avoid forming a horizontal through seam on the column, therefore, the height of the steel hoop 6 is preferably 2-20 cm;

[0044] Grouting holes 7 are provided on the sealing plates of the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4. The grouting holes 7 connect the internal cavity of the prefabricated hollow column 1 in the upper part of the beam-column core area, the abdominal cavity between the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4, and the steel hoop 6 and the internal space of the beam-column core area. The internal cavity of the prefabricated hollow column 1, the abdominal cavity between the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4, and the steel hoop 6 and the internal space of the beam-column core area are all filled with concrete. The connected space can not only realize the overall pouring, but also ensure the integrity of the concrete body after solidification, thereby improving the strength of the node. In order to ensure the quality of grouting, the size and number of the grouting holes 7 need to be determined by calculation.

[0045] In addition, the present invention also provides a construction method for the above-mentioned assembled reinforced concrete beam-column connection node, comprising the following steps:

[0046] Step 1: Make a prefabricated hollow column 1. If the frame beam 2 is a prefabricated beam, the prefabricated beam needs to be made simultaneously at this time, and the additional steel bars 8 and the diagonal bracing steel bars 11 are fixed in advance to the ends of the column longitudinal bars 101. Then, the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 are sleeved on the ends of the column longitudinal bars 101 and fastened and fixed by nuts 10. The specific manufacturing process of the prefabricated hollow column 1 is as follows: the steel cage fixed with the inner mold is placed in the outer mold, the first concrete material is filled into the outer mold, and the cavity of the outer mold is closed. The first centrifugation is performed according to the first preset parameters to form the first concrete material into a concrete shell. The second concrete material is filled into the concrete shell, and the second centrifugation is performed according to the second preset parameters to form the second concrete material into a rough layer embedded in the inner surface of the concrete shell;

[0047] Step 2: Install the prefabricated hollow column 1 at the lower part of the core area of ​​the beam and column in place, sprinkle water on the internal cavity of the prefabricated hollow column 1 to moisten it, and pour concrete from the top of the prefabricated hollow column 1 to its internal cavity. The installation of the prefabricated hollow column 1 on the first floor can refer to the following steps. Before hoisting, pop up the longitudinal and transverse axis positioning lines and the -1.100m elevation line on the foundation cup surface as the basis for column alignment and correction. Then measure each strip foundation cup by measuring the four corner points and calculating the base elevation in combination with the corresponding column model. Adjust the value and mark it in the cup mouth. The prefabricated hollow column 1 is lifted by the single-machine rotation method. The lifting point of the crane is set above the center of gravity of the column, and the root of the column touches the ground. When the bottom end of the prefabricated hollow column 1 is 500-1000mm away from the cup mouth, pause slightly and check whether the hanging is firm again. After confirmation, the center line of the column foot is aligned with the reference line marked on the cup mouth and then slowly dropped. When the column foot is 30-50mm away from the bottom of the cup, the alignment method is to use eight steel wedges to put into the cup mouth from the four sides of the column, and use a jack to pry the column foot so that The installation center line of the column is aligned with the installation center line on the cup mouth, and the column is kept vertical. The diagonal adjustment rod is used to fine-tune the root of the column to adjust the horizontal position of the column, and then the horizontal displacement of the top of the column is adjusted to control the verticality of the column. After the prefabricated hollow column 1 is installed, it should be grouting fixed immediately. Before grouting, the wood chips, soil particles and other garbage in the gap of the cup mouth should be cleaned up, and the column and cup mouth wall should be moistened with water. In the case of a large gap between the column foot and the cup bottom due to uneven column bottom or tilted bottom surface of the column foot, a layer of thin cement sand should be poured first. Grouting, after filling the gap, then pouring grouting material, grouting material is carried out in two times, the first grouting material is poured to the lower end of the wedge block, during the pouring process, pouring is started from one end until the grouting material is seen flowing out from the other end to ensure that the bottom is poured densely, when the grouting material of the first pouring reaches 25% of the design strength grade, the wedge block can be pulled out, and the second grouting is carried out to fill the cup mouth with grouting material, before pouring concrete in the internal cavity of the prefabricated hollow column 1, the hollow part of the prefabricated hollow column 1 needs to be sprinkled with water for moistening treatment, and concrete is poured from the top of the column;

[0048] Step 3: construct the frame beam 2. The structural form of the frame beam 2 is not limited and can be a prefabricated beam or a cast-in-place beam or a composite slab.

[0049] The installation process of prefabricated beams is as follows: after the hoisting and pouring of prefabricated hollow column 1 is completed, the prefabricated beam hoisting operation is carried out. The hoisting operation is carried out by tower crane. The principle of hoisting the beams should follow the principle of first installing the main beam and then the secondary beam. The prefabricated beams are hoisted in two points. The hoisting points are located at the ends of the prefabricated beams at a distance of 0.2L (L is the length of the beam) from both ends of the beams. The hooks and lock ropes are directly tied to the exposed steel bars of the prefabricated beams. Note that the angle of the hoisting rope should not be less than 45 degrees. After the hook rope is hung, it is slowly lifted and tightened. It is about 500mm off the ground. Stop rising when the beam is right, carefully check whether the lifting equipment is firm and whether the hooking is safe and reliable. Only after checking that everything is correct can it be hoisted into place. When the precast beam is hoisted to 500mm from the design elevation, stop lowering. The operator stabilizes the composite beam and refers to the control line on the column and the ground to guide the precast beam to slowly descend to above the column head support point. By adjusting the vertical independent support, ensure that the precast beam meets the design elevation and quality control requirements. Use the crowbar to adjust the horizontal positioning of the composite beam to ensure that the precast beam meets the horizontal positioning and quality control requirements of the design drawings.

[0050] The construction process of cast-in-place beams is as follows: cast-in-place beams adopt the method of setting up brackets on site, installing formwork, tying steel bars, and pouring concrete. The bowl-shaped bracket setting procedure is adopted. According to the elevation difference between the bottom surface of the beam and the ground, the specifications of the vertical poles are pre-selected and the layout of the vertical and horizontal tie rods is drawn up. The wood is laid on the ground, the support is positioned, the lower vertical poles and the vertical and horizontal horizontal poles are installed, the horizontal tie rods and the benchmark elevation are measured and adjusted, and the bowl-shaped poles are locked. The vertical poles are straightened vertically and the tie rods are horizontally horizontal. The scaffolding is placed and then Continue to connect the upper vertical poles and horizontal pull rods, install the upper support, connect the vertical poles, fasten the horizontal poles, place the crossbeams, and then install the beam template. First, pop up the beam axis and horizontal line and check them. Install the beam bottom template, arch the beam bottom, tie the steel bars, install the side beam template, and check the size and position of the beam template. First, lay the bottom template and one side template of the beam template. After the beam steel bars are tied and accepted, seal the other side template. The steel bars are tied inside the template. After the beam bottom template is laid, mark the beam axis position and the 202 spacing of the beam stirrups. , and then tie in the following order: wear the main reinforcement 201 of the main beam through the beam stirrups 202, separate them one by one according to the marked spacing, fix the bent reinforcement and main reinforcement, wear the bent reinforcement and main reinforcement of the secondary beam and put on the stirrups, put the main beam frame reinforcement and the secondary beam frame reinforcement, tie the main reinforcement and stirrups at the bottom of the beam at a certain interval, tie the frame reinforcement, and then tie the main reinforcement. When tying the steel bars, the main and secondary beams are carried out at the same time. The stirrups in the beam are perpendicular to the main reinforcement, the stirrup joints are staggered, and the intersections of the stirrup corners and the longitudinal reinforcement should be tied tightly. The overlapping parts of the stirrup hooks are staggered in the beam. When pouring concrete, pouring and vibration must be closely coordinated. The first layer should be poured slowly. After the bottom of the beam is fully vibrated, the second layer can be poured. The "rushing slurry method" is used to keep the cement slurry wrapped around the stones along the bottom of the beam and move forward. Each layer should be vibrated before pouring. Pay attention to the vibration of the bottom of the beam and the beam ribs. The steel bars and embedded parts must not be touched during vibration. When the steel bars at the beam-column joint are dense, it is advisable to use fine stones and concrete of the same strength grade when pouring the concrete here, and vibrate with a small diameter vibrator.

[0051] The construction process of the composite slab is as follows: the composite slab is hoisted by a four-point hoisting method. During the hoisting process of the composite slab, it is paused 300mm above the working layer, and the direction of the composite slab is adjusted according to the position of the composite slab for positioning. During the hoisting process, care should be taken to avoid collision between the reserved steel bars on the composite slab and the column longitudinal bars 101 on the prefabricated hollow column 1. The composite slab is stopped steadily and slowly to avoid damage to the slab surface due to excessive impact during hoisting and placement. The electromechanical and electrical boxes and pipelines in the composite slab are laid and connected according to the requirements of the drawings. For the convenience of construction, the corresponding wire boxes and reserved openings have been embedded in the prefabricated slabs according to the design drawings during the factory production stage. During the construction process, all parties must do a good job of protecting the finished product. After the water and electricity pipelines are laid, , the reinforcement workers can install the upper reinforcement of the floor slab, protect the laid reinforcement and formwork, and prohibit walking or stepping on the bottom formwork, and prohibit arbitrarily pulling or cutting the lattice reinforcement. The upper reinforcement of the floor slab should be placed on the upper chord reinforcement of the truss and tied and fixed with the truss to prevent deviation and floating during concrete pouring. After the superposition surface is cleaned, the superposition slab concrete is poured. Before pouring concrete, the superposition slab surface is carefully cleaned and watered to make it moist. When pouring the superposition slab concrete, in order to ensure that the superposition slab and the support are evenly stressed, the concrete is poured from the middle to both sides, and the construction is completed in one go. At the same time, a flat vibrator is used to vibrate to ensure that the concrete is vibrated and dense. The slab thickness is controlled according to the floor slab elevation control line. A 2m scraper is used to scrape the concrete flat during pouring.

[0052] Step 4: hoist the prefabricated hollow column 1 at the upper part of the core area of ​​the beam and column into place, adjust the position of the upper prefabricated hollow column 1 so that the openings of the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 are aligned, and fix the prefabricated hollow column 1 at the upper part of the core area of ​​the beam and column by temporary fixing measures;

[0053] Step 5: After verifying the position (plane position, elevation and verticality) of the prefabricated hollow column 1 above the core area of ​​the beam and column using a theodolite, fix the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4 at their joints by slope welding;

[0054] Step 6: Support the formwork of the core area of ​​beams and columns;

[0055] Step 7: Sprinkle water to moisten the inner cavity of the prefabricated hollow column 1 at the upper part of the core area of ​​the beam and column, and pour concrete from the top of the prefabricated hollow column 1 into its inner cavity. The concrete flows from the grouting hole 7 into the abdominal cavity between the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4, as well as the steel hoop 6 and the inner space of the beam and column core area, and the inner cavity of the prefabricated hollow column 1, the abdominal cavity between the upper connecting steel cylinder 3 and the lower connecting steel cylinder 4, as well as the steel hoop 6 and the inner space of the beam and column core area are poured densely.

[0056] Step 8: After the concrete in the core area of ​​the beam and column reaches the preset strength, the formwork is removed and the next prefabricated hollow column 1 is hoisted.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connection node between a prefabricated hollow column and a frame beam, characterized by: It comprises an upper connecting steel cylinder (3), a lower connecting steel cylinder (4), a prefabricated hollow column (1) and a frame beam (2), wherein the cross-sectional shapes of the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4) both match the cross-sectional shape of the prefabricated hollow column (1), and the two are respectively fixed to the ends of the longitudinal reinforcement (101) of the prefabricated hollow column (1) on the upper and lower sides of the beam-column core area; A connecting steel (5) is embedded at the bottom end of the prefabricated hollow column (1) at the upper portion of the beam-column core area, and the end of the connecting steel (5) is welded to the sealing plate of the upper connecting steel cylinder (3); The column longitudinal reinforcement (101) in the prefabricated hollow column (1) at the lower portion of the beam-column core region vertically penetrates the beam-column core region and extends to above the beam-column core region, and diagonal bracing steel bars (11) are fixedly arranged between the column longitudinal reinforcement (101) in the beam-column core region; The column stirrups (102) at the ends of the prefabricated hollow columns (1) and in the core areas of the beams and columns are densely arranged; The peripheral wall of the lower connecting steel cylinder (4) extends beyond the bottom sealing plate thereof by a distance to form a steel hoop (6), and the bottom end of the steel hoop (6) is correspondingly arranged at the top end of the core area of ​​the beam column. The openings of the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4) are opposite to each other and are welded and sealed at the joint. Grouting holes (7) are provided on the sealing plates of the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4), and the grouting holes (7) connect the internal cavity of the prefabricated hollow column (1), the abdominal cavity between the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4), and the internal space of the steel hoop (6) and the core area of ​​the beam and column, and the internal cavity of the prefabricated hollow column (1), the abdominal cavity between the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4), and the internal space of the steel hoop (6) and the core area of ​​the beam and column are all filled with concrete; An additional steel bar (8) is provided on the top of the prefabricated hollow column (1) at the lower part of the beam-column core area. The additional steel bar (8) is correspondingly provided on the inner side of the column longitudinal bar (101). One end of the steel bar is embedded in the concrete of the prefabricated hollow column (1), and the other end vertically penetrates the beam-column core area and is fixed to the lower connecting steel cylinder (4). One end of the additional steel bar (8) embedded in the prefabricated hollow column (1) is fixedly provided with an anchor plate (9).

2. The connection node between a prefabricated hollow column and a frame beam according to claim 1, characterized in that: The connecting steel (5) is a cross-shaped steel with flanges, and the height of the cross-shaped steel with flanges is not less than half of the long side dimension of the cross section of the prefabricated hollow column (1).

3. The connection node between a prefabricated hollow column and a frame beam according to claim 1, characterized in that: The length of the densified section of the column stirrup (102) is not less than the long side dimension of the cross section of the prefabricated hollow column (1).

4. The connection node between a prefabricated hollow column and a frame beam according to claim 1, characterized in that: The total height of the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4) is 20-100 cm.

5. The connection node between a prefabricated hollow column and a frame beam according to claim 1, characterized in that: The height of the steel hoop (6) is 2-20 cm.

6. A method for constructing a connection node between a prefabricated hollow column and a frame beam, applied to the construction process of a connection node between a prefabricated hollow column and a frame beam as claimed in any one of claims 1 to 5, characterized in that: The steps include: Step 1: fabricate a prefabricated hollow column (1), and pre-fix the diagonal bracing steel bars (11), the upper connecting steel cylinder (3), and the lower connecting steel cylinder (4) at the column longitudinal reinforcement (101) joint section; Step 2: Install the prefabricated hollow column (1) at the lower part of the core area of ​​the beam and column in place, wet the inner cavity of the prefabricated hollow column (1) with water, and pour concrete from the top of the prefabricated hollow column (1) into the inner cavity; Step 3: construct the frame beam (2); Step 4: hoist the prefabricated hollow column (1) at the upper part of the core area of ​​the beam and column into place, so that the openings of the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4) are aligned; Step 5: Check the position of the prefabricated hollow column (1) at the upper part of the core area of ​​the beam and column, and weld and fix the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4) at the joint between the two; Step 6: Support the formwork of the core area of ​​beams and columns; Step seven, the inner cavity of the prefabricated hollow column (1) at the upper part of the core area of ​​the beam and column is wetted by sprinkling water, and concrete is poured from the top of the prefabricated hollow column (1) into the inner cavity thereof, and the concrete flows from the grouting hole (7) into the abdominal cavity between the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4), as well as the steel hoop (6) and the inner space of the core area of ​​the beam and column, and the inner cavity of the prefabricated hollow column (1), the abdominal cavity between the upper connecting steel cylinder (3) and the lower connecting steel cylinder (4), as well as the steel hoop (6) and the inner space of the core area of ​​the beam and column are poured densely; Step 8: After the concrete in the core area of ​​the beam and column reaches the preset strength, the formwork is removed and the next prefabricated hollow column (1) is hoisted and installed.

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