Prefabricated RC precast column-RC beam connection node and its construction method

Abstract

To provide a connection node of a built-up RC precast column-RC beam, and a construction method of the same.SOLUTION: A connection node includes an upper connection steel sleeve 3, a lower connection steel sleeve 5, an RC precast column 1 and an RC beam 2, wherein an upper reinforcement anchor plate 4 is fixed to inside the upper connection steel sleeve 3, a peg 7 is fixed to a cylindrical wall above the upper reinforcement anchor plate 4, the upper connection steel sleeve 3 is externally fit to the bottom end of the RC precast column 1, a lower reinforcement anchor plate 6 is fixed to inside the lower connection steel sleeve 5, a peg 7 is fixed to the cylindrical wall below the lower reinforcement anchor plate 6, a column vertical reinforcement 101 penetrates through a beam-column core region and the lower reinforcement anchor plate 6 in a vertical direction in the RC precast column 1 and is locked by a nut, the upper connection steel sleeve 3 and the lower connection steel sleeve 4 are welded to each other, and an internal space of the upper connection steel sleeve 3, the lower connection steel sleeve 4 and the beam-core region is filled with concrete by a grout unit 8.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to the technical field of prefabricated building construction, and specifically to a prefabricated RC precast column-RC beam connection node and its construction method. [Background technology]

[0002] China's prefabricated construction has been developing for more than 70 years, and during that time it has experienced ups and downs, from the initial manual production to mechanized production, while learning advanced foreign technologies and being able to innovate independently.

[0003] With the development of economy and science and technology, the advantages of cast-in-place construction mode are gradually lost, and prefabricated construction has become the main development direction of China's construction industry in the future. In the past five years, the state has issued many important policies one after another to vigorously promote the development of prefabricated construction. RC (Reinforced Concrete) columns are the important vertical support members in prefabricated construction, and RC beams are the main bending members in prefabricated construction. In-depth research on beam-column nodes will have a decisive impact on promoting the application and development of prefabricated construction. Summary of the Invention [Problem to be solved by the invention]

[0004] The connection node of the reinforced concrete frame structure is the point where the upper and lower RC columns, RC beams and floor slabs cross and connect, and since it is generally necessary to reinforce the rebars in the structural design process, the rebars of the frame structure nodes cross vertically and horizontally and are very dense, and as a prefabricated concrete frame structure, the RC precast columns, RC precast beams, precast floor slabs and other components are all provided with spare rebars, and how to gather these rebars so that they do not collide with each other and make the load-bearing capacity reasonable is an important issue that must be considered, and is also the main problem to be solved in factory precast processing and on-site lifting and assembly work. Due to the dense rebars in the node area, when the vertical bars of the RC precast columns are connected one by one in the node by the method of sleeve injection, there are problems such as small construction space, great connection difficulties, low construction efficiency and difficulty in ensuring construction quality.

[0005] In order to solve the technical problems described in the background art, the present invention aims to provide a prefabricated RC precast column-RC beam connection node and its construction method. [Means for solving the problem]

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The prefabricated RC precast column-RC beam connection node includes an upper connection steel sleeve, a lower connection steel sleeve, an RC precast column and an RC beam, the cross-sectional shapes of the upper connection steel sleeve and the lower connection steel sleeve are consistent with the cross-sectional shape of the RC precast column; An upper reinforcing bar anchor plate is fixed inside the cylinder of the upper connecting steel sleeve, and the upper reinforcing bar anchor plate divides the inside of the upper connecting steel sleeve into two cavities, upper and lower, and several pegs are fixed on the cylinder wall of the upper cavity of the upper reinforcing bar anchor plate. The upper connecting steel sleeve above the upper reinforcing bar anchor plate is fitted on the bottom end of the RC precast column above the beam-column core area, and inside the RC precast column, the column vertical bar penetrates the upper reinforcing bar anchor plate and is locked by a nut, and the upper peg of the upper reinforcing bar anchor plate is embedded in the RC precast column; The bottom end of the lower connection steel sleeve is provided corresponding to the tip of the beam-column core area, and a lower reinforcement anchor plate is fixed inside the cylinder, which divides the inside of the lower connection steel sleeve into two cavities, upper and lower, and several pegs are fixed on the cylinder wall of the lower cavity of the lower reinforcement anchor plate, and in the RC precast column below the beam-column core area, the column longitudinal bars vertically pass through the beam-column core area and the lower reinforcement anchor plate and are locked by nuts; The column hoop reinforcement at the end of the RC precast column and in the beam-column core area are arranged closely together, and diagonal brace reinforcement is fixed and arranged between the column vertical reinforcement in the beam-column core area. The lower opening of the upper connection steel sleeve and the upper opening of the lower connection steel sleeve are vertically aligned and butted together, and the joints are welded closed, and the internal spaces of the upper connection steel sleeve, the lower connection steel sleeve and the beam-column core area are filled with concrete by a grout unit.

[0007] Preferably, the grout unit includes a grout injection pipe, an exhaust pipe and a grout hole, the grout injection pipe and the exhaust pipe are both embedded and installed in the upper RC precast column of the beam-column core area, one end of both pipes passes through the upper rebar anchor plate and extends to the lower cavity of the upper connecting steel sleeve, and the other end extends to the outside of the RC precast column, the grout injection pipe and the exhaust pipe connect the lower cavity of the upper connecting steel sleeve to the outside, and the grout hole is installed in the lower rebar anchor plate and connects the cavities of the lower connecting steel sleeves on both the upper and lower sides of the lower rebar anchor plate.

[0008] Preferably, the length of the dense segment of the column hoop reinforcement is equal to or greater than the length of the long side of the cross section of the RC precast column.

[0009] Preferably, the grout injection pipe and the exhaust pipe are provided on the same diagonal of the upper reinforcing bar anchor plate, and are provided on both sides of the center position of the upper reinforcing bar anchor plate.

[0010] In addition, the present invention further provides a construction method for the prefabricated RC precast column-RC beam connection node, Step 1: manufacturing a RC precast column and pre-fixing a diagonal brace rebar, an upper connection steel sleeve, and a lower connection steel sleeve to the end of the column vertical reinforcement; Step 2 is to fully install the RC precast columns at the bottom of the beam-column core area; Step 3 is to construct the RC beams. Step 4: lifting the upper RC precast column of the beam-column core area sufficiently to vertically align the upper connection steel sleeve and the lower connection steel sleeve; Step 5: checking the position of the RC precast column at the top of the beam-column core area and fixing the upper connection steel sleeve and the lower connection steel sleeve by welding at their joints; Step 6 of supporting and positioning the template of the beam-column core area; Step 7: pouring concrete into the internal space of the upper connection steel sleeve, the lower connection steel sleeve and the beam-column core area by the grout unit, and vibrating it to be dense; and step 8, after the concrete in the beam-column core area has reached a specified strength, the form is removed and the next RC precast column is hoisted. Effect of the Invention

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the effective connection of the column longitudinal bars of the solid precast columns above and below the beam-column core area is realized by the upper connection steel sleeve and the lower connection steel sleeve which are connected by welding, the connection of the column longitudinal bars is shifted from the beam-column core area, which can avoid connecting the column longitudinal bars one by one in the beam-column core area where the construction space is narrow, and the through arrangement of the column longitudinal bars in the beam-column core area can be guaranteed, and the closed chamber between the upper connection steel sleeve and the lower connection steel sleeve and the beam-column core area can be realized with the overall grouting in the way of cast-in-place concrete, which makes the construction convenient and efficient, and ensures the connection quality.

[0012] The above and / or other aspects and advantages of the present invention will become more apparent and comprehensible through detailed description in conjunction with the following drawings, which are not limiting of the present invention and are merely schematic. [Brief description of the drawings]

[0013] [Figure 1] Schematic diagram of the three-dimensional structure of the connection node between the prefabricated RC precast column and the RC beam according to the present invention [Diagram 2] A schematic diagram of the three-dimensional structure of the connection node between the prefabricated RC precast column and the RC beam according to the present invention, with some of the structure removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the present invention will be described with reference to the drawings, with reference to the examples of the prefabricated RC precast column-RC beam connection node and its construction method. The examples described herein are specific embodiments of the present invention, and explain the concept of the present invention. They are interpretive and exemplary, and do not limit the embodiments and scope of the present invention. In addition to the examples described herein, a person skilled in the art may further adopt other obvious technical solutions based on the claims and the disclosure of the specification of this application, and these technical solutions include any obvious replacements and amendments to the examples described herein.

[0015] In the description of the present invention, the orientations or positional relationships indicated by terms such as "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "vertical", etc. are orientations or positional relationships according to the drawings, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, but are merely for the convenience and simplification of the description of the present invention, and are not limiting of the present invention. Furthermore, the terms "first" and "second" do not indicate or imply relative importance, but are merely for the purpose of description.

[0016] The drawings in this specification are schematic diagrams, which explain the concept of the present invention and show the shape of each part and their interrelationships. Here, in order to clearly show the structure of each part of the embodiment of the present invention, the drawings are not drawn to the same scale. The same reference numerals indicate the same parts.

[0017] The principles and features of the present invention will be described below in conjunction with the drawings, and the examples given do not limit the scope of the present invention but merely serve to interpret the present invention. A preferred embodiment of the present invention will be described in more detail below in conjunction with Figures 1-2, and in order to more clearly show the internal structure of the beam-column, some of the beam-column reinforcement is not shown in Figures 1-2.

[0018] As shown in Figures 1 and 2, a preferred prefabricated RC precast column-RC beam connection node of the present invention includes an upper connection steel sleeve 3, a lower connection steel sleeve 5, an RC precast column 1 and an RC beam 2, and the cross-sectional shapes of the upper connection steel sleeve 3 and the lower connection steel sleeve 5 both match the cross-sectional shape of the RC precast column 1.

[0019] An upper rebar anchor plate 4 is fixed inside the cylinder of the upper connecting steel sleeve 3, which divides the inside of the upper connecting steel sleeve 3 into two cavities, upper and lower, and several pegs 7 are fixed on the cylinder wall of the upper cavity of the upper rebar anchor plate 4. The upper connecting steel sleeve 3 above the upper rebar anchor plate 4 is fitted onto the bottom end of the RC precast column 1 above the beam-column core area, and within the RC precast column 1, the column vertical bar 101 penetrates the upper rebar anchor plate 4 and is locked by the nut 10. Of course, a shim plate may be added between the nut 10 and the upper rebar anchor plate 4. The peg 7 above the upper rebar anchor plate 4 is embedded in the RC precast column 1, and the peg 7 effectively improves the connection strength between the upper connecting steel sleeve 3 and the RC precast column 1 to ensure that the upper connecting steel sleeve 3 is firmly fixed.

[0020] The bottom end of the lower connecting steel sleeve 5 is provided corresponding to the tip of the beam-column core area, and a lower rebar anchor plate 6 is fixed inside the cylinder, which divides the inside of the lower connecting steel sleeve 5 into two cavities, upper and lower, and several pegs 7 are fixed to the cylinder wall of the lower cavity of the lower rebar anchor plate 6. Within the RC precast column 1 below the beam-column core area, the column vertical bars 101 vertically penetrate the beam-column core area and the lower rebar anchor plate 6 and are locked by the nuts 10; of course, a shim plate may be added between the nuts 10 and the lower rebar anchor plate 6.

[0021] The column hoop reinforcements 102 at the ends and beam-column core region of the RC precast column 1 are both arranged densely, the length of the dense segment of the column hoop reinforcements 102 is equal to or greater than the length of the long side of the cross section of the RC precast column 1, and diagonal brace reinforcements 9 are fixed and arranged between the column vertical reinforcements 101 in the beam-column core region. The dense arrangement of the column hoop reinforcements 102 and diagonal brace reinforcements 9 improves the structural strength and shear strength of the beam-column connection nodes.

[0022] The lower opening of the upper connecting steel sleeve 3 and the upper opening of the lower connecting steel sleeve 5 are vertically aligned and butted together, and the joints are welded closed. The total height of the upper connecting steel sleeve 3 and the lower connecting steel sleeve 5 is 40 to 150 cm. The internal spaces of the upper connecting steel sleeve 3, the lower connecting steel sleeve 5 and the beam-column core area are filled with concrete by the grout unit 8.

[0023] As shown in FIG. 2, the grout unit 8 includes a grout injection pipe 801, an exhaust pipe 802, and a grout hole 803. The grout injection pipe 801 and the exhaust pipe 802 are both embedded in the RC precast column 1 at the upper part of the beam-column core region. The grout injection pipe 801 and the exhaust pipe 802 are provided on the same diagonal of the upper reinforcing bar anchor plate 4, and are provided on both sides of the center position of the upper reinforcing bar anchor plate 4. One end of each of the pipes penetrates the upper reinforcing bar anchor plate 4 and extends to the lower cavity of the upper connecting steel sleeve 3, and the other end extends to the outside of the RC precast column 1. the grout injection pipe 801 and the exhaust pipe 802 connect the lower cavity of the upper connecting steel sleeve 3 with the outside, and the grout hole 803 is provided in the lower rebar anchor plate 6 and connects the cavities of the lower connecting steel sleeve 5 on both the upper and lower sides of the lower rebar anchor plate 6, the connecting space can realize overall injection and ensure the integrity of the concrete body after solidification, and further improve the strength of the node, and in order to ensure the grouting quality, the number of the grout injection pipes 801 and the exhaust pipes 802, the pipe diameter, the opening size and the opening number of the grout holes 803 are all determined by calculation.

[0024] In addition, the present invention further provides a construction method for the prefabricated RC precast column-RC beam connection node, Step 1: manufacturing an RC precast column 1, and if the RC beam is in the form of a precast beam, manufacturing the precast beam synchronously, pre-fixing the diagonal brace rebar 9 to the end of the column vertical bar 101, and then fitting the upper connection steel sleeve 3 and the lower connection steel sleeve 5 to the end of the column vertical bar 101 and locking and fixing them with nuts 10; Step 2 is to fully install the RC precast column 1 at the bottom of the beam-column core area; Step 3 of constructing the RC beam 2, in which the structural form of the RC beam 2 is not limited and may be a cast-in-place beam, a layered beam, or a precast beam; Step 4 is to sufficiently lift the RC precast column 1 at the top of the beam-column core area, adjust the position of the RC precast column 1 at the top of the beam-column core area so as to vertically align the upper connection steel sleeve 3 and the lower connection steel sleeve 5, and fix the RC precast column 1 at the top of the beam-column core area with a temporary fixing measure; Step 5: checking the position of the RC precast column 1 at the top of the beam-column core area, and welding and fixing the upper connection steel sleeve 3 and the lower connection steel sleeve 5 at their joints by groove welding; Step 6 of supporting and positioning the template of the beam-column core area; Step 7: Inject concrete into the internal space of the upper connection steel sleeve 3, the lower connection steel sleeve 5 and the beam-column core area by the grout unit 8, and vibrate it to make it dense; and step 8, after the concrete in the beam-column core region has reached a predetermined strength, the form is removed and the next RC precast column 1 is hoisted.

[0025] The above does not limit the present invention, but is merely a preferred embodiment of the present invention. Any amendments, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should fall within the protection scope of the present invention. [Explanation of symbols]

[0026] 1 RC precast column 101 Vertical column reinforcement 102 Column Hoop Reinforcement 2 RC beam 201 Main beam reinforcement 202 Beam hoop 3 Upper connecting steel sleeve 4 Upper rebar anchor plate 5 Lower connecting steel sleeve 6 Bottom rebar anchor plate 7 Pegs 8 Grout Units 801 Grout injection pipe 802 Exhaust pipe 803 Grout hole 9 Diagonal bracing bars 10 Nut

Claims

1. A prefabricated RC precast column-RC beam connection node, comprising an upper connection steel sleeve (3), a lower connection steel sleeve (5), an RC precast column (1) and an RC beam (2), the cross-sectional shapes of the upper connection steel sleeve (3) and the lower connection steel sleeve (5) both match the cross-sectional shape of the RC precast column (1); An upper reinforcing bar anchor plate (4) is fixed inside the cylinder of the upper connecting steel sleeve (3), the upper reinforcing bar anchor plate (4) divides the inside of the upper connecting steel sleeve (3) into two cavities, an upper cavity and an upper cavity, and some pegs (7) are fixed to the cylinder wall of the upper cavity of the upper reinforcing bar anchor plate (4). The upper connecting steel sleeve (3) above the upper reinforcing bar anchor plate (4) is fitted onto the bottom end of the RC precast column (1) above the beam-column core area. Inside the RC precast column (1), the column vertical bar (101) penetrates the upper reinforcing bar anchor plate (4) and is locked by a nut (10). Another part of the peg (7) above the upper reinforcing bar anchor plate (4) is embedded in the RC precast column (1). The bottom end of the lower connection steel sleeve (5) is provided corresponding to the tip of the beam-column core area, and the lower rebar anchor plate (6) is fixed inside the cylinder, and the lower rebar anchor plate (6) divides the inside of the lower connection steel sleeve (5) into two cavities, upper and lower, and several pegs (7) are fixed to the cylinder wall of the lower cavity of the lower rebar anchor plate (6). In the RC precast column (1) below the beam-column core area, the column vertical reinforcement (101) vertically penetrates the beam-column core area and the lower rebar anchor plate (6) and is locked by a nut (10); The end of the RC precast column (1) and the column hoop reinforcement (102) in the beam-column core region are both densely arranged, and diagonal brace reinforcement (9) is fixed and arranged between the column vertical reinforcements (101) in the beam-column core region, The lower opening of the upper connection steel sleeve (3) and the upper opening of the lower connection steel sleeve (5) are aligned vertically and butted together, and the joints are welded and closed. The upper connection steel sleeve (3), the lower connection steel sleeve (5) and the internal space of the beam-column core area are filled with concrete by the grout unit (8). The grout unit (8) includes a grout injection pipe (801), an exhaust pipe (802) and a grout hole (803), the grout injection pipe (801) and the exhaust pipe (802) are all embedded in the upper RC precast column (1) in the beam-column core region, one end of each pipe passes through the upper reinforcing bar anchor plate (4) and extends to the lower cavity of the upper connecting steel sleeve (3), and the other end extends to the outside of the RC precast column (1), the grout injection pipe (801) and the exhaust pipe (802) connect the lower cavity of the upper connecting steel sleeve (3) to the outside, and the grout hole (803) is provided in the lower reinforcing bar anchor plate (6) and connects the cavities of the lower connecting steel sleeve (5) on both the upper and lower sides of the lower reinforcing bar anchor plate (6). This is a prefabricated RC precast column-RC beam connection node.

2. The connection node of the prefabricated RC precast column to RC beam as described in claim 1, characterized in that the length of the dense segment of the column hoop reinforcement (102) is equal to or greater than the length of the long side of the cross section of the RC precast column (1).

3. The assembly-type RC precast column-RC beam connection node according to claim 1, characterized in that the grout injection pipe (801) and the exhaust pipe (802) are provided on the same diagonal of the upper reinforcing bar anchor plate (4) and on both sides of the center position of the upper reinforcing bar anchor plate (4).

4. A construction method for a prefabricated RC precast column-RC beam connection node applied to a construction process of the prefabricated RC precast column-RC beam connection node according to any one of claims 1 to 3, Step 1: manufacturing an RC precast column (1) and pre-fixing a diagonal brace rebar (9), an upper connection steel sleeve (3) and a lower connection steel sleeve (5) to the end of the column vertical bar (101); Step 2: Installing the lower RC precast column (1) in the beam-column core area; Step 3 is to construct the RC beam (2); Step 4: Lifting the upper RC precast column (1) of the beam-column core area so as to vertically align the upper connection steel sleeve (3) and the lower connection steel sleeve (5); Step 5: checking the position of the RC precast column (1) at the top of the beam-column core area, and fixing the upper connection steel sleeve (3) and the lower connection steel sleeve (5) at their joints by welding them together; Step 6 of supporting and positioning the template of the beam-column core area; Step 7: pouring concrete into the internal space of the upper connection steel sleeve (3), the lower connection steel sleeve (5) and the beam-column core area by the grout unit (8), and vibrating it to make it dense; and step 8 of removing the form after the concrete in the beam-column core area has reached a predetermined strength, and then lifting the next RC precast column (1).

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