Connecting structure and connecting method of adjustable prefabricated reinforced concrete beam column

Abstract

The invention discloses a connecting structure and a connecting method of an adjustable prefabricated reinforced concrete beam column, a straight thread reverse thread sleeve is directly pre-buried in the prefabricated reinforced concrete beam during factory prefabrication, and no steel bar is exposed at the beam end. The pre-embedded sleeve is reserved on the prefabricated reinforced concrete column, correction of horizontal and vertical installation deviation in the installation process is facilitated, correction of installation deviation in the beam-column connection axis direction is guaranteed through the adjustable connecting piece, and connection length deviation, horizontal deviation and vertical deviation at the joint can be adjusted within a certain range. After a plurality of in-beam longitudinal bars are anchored through the end plates, the in-beam longitudinal bars are converted into a small number of pre-buried straight-thread reverse-thread sleeves, the number of connecting pieces is greatly reduced, and the workload and difficulty of site prefabrication, installation, construction and alignment are remarkably reduced.

Description

Technical Field

[0001] The invention relates to the field of construction engineering, and in particular to an adjustable prefabricated reinforced concrete beam-column connection structure and a connection method. Background Art

[0002] Prefabricated concrete structures are prefabricated concrete components or parts connected by steel bars, connectors or prestressed materials, and usually require on-site pouring of concrete at the nodes of the prefabricated components to form an integral structure. Compared with traditional cast-in-place structures, prefabricated concrete structures have the advantages of being less restricted by climatic conditions, shorter construction period, faster construction, saving labor and improving building quality.

[0003] In the current era of promoting green environmental protection and pollution-free, prefabricated concrete structures are developing rapidly in my country. The design of prefabricated components of prefabricated concrete structures is by no means a simple conversion of cast-in-place concrete structures into independent component designs. The design, manufacturing, and construction of this type of structure are highly related, and the key process is the connection between components. The most common connection is the connection between prefabricated reinforced concrete beams and prefabricated reinforced concrete columns, especially the rigid connection nodes of prefabricated reinforced concrete beams and columns, which need to bear bending moments and shear forces at the nodes.

[0004] Invention patent 201810482731.2 discloses a connection structure and method for precast concrete beams and columns. During factory prefabrication, straight threaded sleeves are directly embedded in precast components. During the on-site installation stage, the precast components are connected through adjustable connectors, which replaces the exposed longitudinal steel bar connection sections of the precast components in the prior art. Both beams and columns are provided with larger post-casting sections, which facilitates the production and installation of formwork, simplifies the on-site installation process, and avoids the possible impact on the exposed steel bars during transportation and lifting. However, straight threaded positive and negative thread sleeves are embedded in each longitudinal reinforcement of the precast reinforced concrete beam, and a large number of adjustable connectors are required. The workload during on-site installation is large, and installation deviations are prone to occur, which increases the difficulty of on-site installation and alignment.

[0005] Although the current standards such as "Concrete Structure Construction Quality Acceptance Code" (GB50204-2015) and "Assembled Concrete Structure Technical Code" (JGJ1-2014) have clear provisions for the acceptance of component installation deviation, requiring that the allowable deviation of component position and size should not exceed 10mm, in actual projects, it is common to encounter installation deviations exceeding the requirements of the specifications at the construction site. Regardless of the node connection method, if the construction error is large and does not meet the requirements of the acceptance specifications, it is easy for the prefabricated components to fail to be installed in place. Summary of the invention

[0006] In order to solve the technical problems existing in the prior art such as the large number of connectors in the connection of precast concrete beams and columns, the heavy workload during on-site installation, and the difficulty in on-site installation and construction alignment when deviations occur, the present invention provides an adjustable precast reinforced concrete beam-column connection structure and connection method, aiming to provide solutions to the problems of horizontal axis alignment and vertical elevation alignment in the rigid joint connections of precast components that exceed a certain range of the construction acceptance specifications, thereby facilitating on-site installation and reducing the difficulty of on-site construction.

[0007] The invention provides the side column node connection mode and the middle column node connection mode of the precast reinforced concrete column and the precast reinforced concrete beam respectively.

[0008] The adjustable precast reinforced concrete beam-column connection structure provided by the present invention comprises a precast reinforced concrete column, a precast reinforced concrete beam, high-strength bolts, a pre-embedded sleeve on the column, a pre-embedded part at the beam end, an adjustable connecting part and a secondary grouting connection section; the pre-embedded sleeve on the column is pre-embedded in the precast reinforced concrete column, and the pre-embedded part at the beam end is pre-embedded in the precast reinforced concrete beam; during the installation stage, the high-strength bolt passes through the pre-embedded sleeve on the column, and the two ends of the adjustable connecting part are respectively connected to the high-strength bolt and the pre-embedded part at the beam end; the secondary grouting material is poured into the connection gap between the precast reinforced concrete column and the precast reinforced concrete beam connected by the adjustable connecting part to form a secondary grouting material connection section; the pre-embedded part at the beam end comprises a longitudinal reinforcement in the beam, a straight thread reverse thread sleeve, an end plate and a fastening nut, two or more longitudinal reinforcements in the beam are connected to the end plate through the fastening nut, and the end plate is connected to the straight thread reverse thread sleeve.

[0009] The adjustable connecting piece includes a straight thread positive thread sleeve, a positive and negative thread screw and a locking nut; one end of the positive and negative thread screw is a positive thread, which can be screwed into the straight thread positive thread sleeve, and the other end is a negative thread, which can be screwed into the straight thread negative thread sleeve; the inner thread of the locking nut is consistent with the positive and negative thread screw, with an inner positive thread, and is sleeved on the positive thread end of the positive and negative thread screw for adjustment.

[0010] Vertical end plates are set at the ends of precast reinforced concrete beams corresponding to the middle positions of the longitudinal reinforcements in the upper and lower beams. Each end plate corresponds to more than two longitudinal reinforcements in the beam. The size of each side of the end plate is 10mm-20mm wider than the corresponding longitudinal reinforcement arrangement size in the beam, and a horizontal stiffening plate is set in the middle of the end plate towards the inside of the beam. A straight threaded reverse thread sleeve is welded and fixed in the middle of the longitudinal reinforcement position of the end plate facing the end of the beam. The distance between the fixed position of the end plate and the end of the beam is determined according to the length of the straight threaded reverse thread sleeve. Each end plate has a hole at the corresponding longitudinal reinforcement position in the beam, and the hole diameter is 0.5mm to 1mm larger than the longitudinal reinforcement in the beam.

[0011] The ends of the longitudinal reinforcement in the beam are processed into a threaded form. The thread length is determined according to the diameter of the longitudinal reinforcement, the thickness of the end plate and the thickness of one fastening nut + 2 to 3 threads. During the steel bar binding stage of the prefabricated beam, the longitudinal reinforcement in the beam is first covered with a fastening nut, and then passed through the end plates at the corresponding positions one by one, and then a fastening nut is covered on the other side and tightened, and then the two nuts are spot welded to the end plate.

[0012] The straight threaded sleeve embedded in the precast reinforced concrete beam is determined based on the inner diameter of the sleeve and the diameter of the high-strength bolts connecting the precast reinforced concrete beam and column. The diameter of the high-strength bolt is calculated and determined based on the principle that the tensile bearing capacity of all high-strength bolts matches the tensile bearing capacity of all longitudinal reinforcements in the beam.

[0013] Both ends of the high-strength bolts have positive threads. When used in the side column-beam connection node, one end has a pad and a fastening nut, and the other end can be screwed into a straight thread positive thread sleeve; when used in the middle column-beam connection node, both ends can be screwed into a straight thread positive thread sleeve. The number of high-strength bolts at the column-beam connection should be as small as possible to avoid the weakening of the local cross-section of the column due to the large diameter and large number of embedded sleeves on the prefabricated column, which will have a greater adverse effect on the transportation and hoisting of the prefabricated column.

[0014] Precast reinforced concrete columns are provided with embedded sleeves on the columns at the corresponding places of the embedded straight threaded reverse thread sleeves at the beam ends. The inner diameter of the embedded sleeves on the columns is 20 to 25 mm larger than the connected high-strength bolts. Column corbels are provided at designated positions of the precast reinforced concrete columns.

[0015] When prefabricating the reinforced concrete columns, the connection positions between the high-strength bolts on the outside of the side columns and the pads and fastening nuts can be processed into local wedge-shaped grooves with a concave depth of 20mm to 25mm, so that after the high-strength bolts are in place and grouting is performed for the second time, the outside can be smoothed to ensure the smooth and beautiful appearance of the prefabricated components.

[0016] In order to ensure the integrity of the connection between the secondary grouting part and the precast concrete component, a number of keyways may be provided on the sides of the connection between the precast reinforced concrete column and the precast reinforced concrete beam.

[0017] The prefabricated reinforced concrete beam-column connection method provided by the present invention comprises the following steps:

[0018] 1) According to the positioning and quantity of the longitudinal reinforcement in the precast concrete beam, the end plate is made, a stiffening plate is set on one side of the end plate, and a straight thread reverse thread sleeve is welded and fixed on the other side;

[0019] 2) The ends of the longitudinal reinforcements in the beam are processed into straight threaded threads by rolling technology; the end plates at the positions of the upper and lower reinforcements in the beam are respectively installed and fixed at the corresponding positions of the longitudinal reinforcements in the beam, the longitudinal reinforcements in the beam are covered with fastening nuts on one side and passed through the end plates, and fastening nuts are also covered on the other side and tightened, and the fastening nuts are spot welded to the end plates, and then concrete is poured to complete the production of prefabricated reinforced concrete beams;

[0020] 3) A pre-buried sleeve is set at a designated position on the prefabricated reinforced concrete column, and then concrete is poured to complete the production of the prefabricated reinforced concrete column;

[0021] 4) First install the prefabricated reinforced concrete column in place, then screw one end of the adjustable connector into the straight thread reverse thread sleeve embedded in the prefabricated reinforced concrete beam one by one, and then hoist the prefabricated reinforced concrete beam;

[0022] 5) When installing the side column-beam connection, insert the high-strength bolts into the column embedded sleeves before the prefabricated reinforced concrete beams are put in place, put the pads on the outside of the columns and screw the fastening nuts; when installing the middle column-beam connection, insert the high-strength bolts into the column embedded sleeves before the prefabricated reinforced concrete beams on one side are put in place and the prefabricated reinforced concrete beams on the other side are put in place;

[0023] 6) After the beam is aligned and in place on the column bracket, screw the high-strength bolts into the straight thread sleeves of the adjustable connector one by one, and then tighten the locking nuts on the adjustable connector;

[0024] 7) After all the connection joints are installed and inspected, pour the secondary grouting material in the gap between the connection section of the precast reinforced concrete beam and the precast reinforced concrete column, and the embedded sleeve on the column and the high-strength bolt connection to form a whole.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. Compared with the prior art, the present invention directly embeds the straight thread reverse thread sleeve in the prefabricated reinforced concrete beam during factory prefabrication, and there is no exposed steel bar at the beam end. The prefabricated reinforced concrete column is provided with an embedded sleeve to facilitate the correction of horizontal and vertical installation deviations during installation. The adjustable connector ensures the correction of installation deviations along the axis of the beam-column connection, so that the connection length deviation, horizontal deviation, and vertical deviation at the node can be adjusted within a certain range. After the longitudinal reinforcements in multiple beams are first anchored through the end plates, they are converted into a smaller number of embedded straight thread reverse thread sleeves, which greatly reduces the number of connectors and significantly reduces the workload and difficulty of on-site prefabrication and installation construction alignment.

[0027] 2. During the on-site installation stage, the prefabricated components are connected by adjustable connectors, which replaces the exposed longitudinal reinforcement connection section of the prefabricated components in the prior art. The beams and columns are equipped with larger post-casting sections, which facilitates the production and installation of the formwork, simplifies the on-site installation process, avoids the possible impact on the exposed steel bars during transportation and hoisting, and effectively ensures the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the prefabricated reinforced concrete beam-side column connection structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the prefabricated reinforced concrete beam-middle column connection structure of the present invention;

[0030] Figure 3 It is a schematic diagram of various parts before the adjustable connector is connected with the high-strength bolt and the straight-thread reverse-thread sleeve;

[0031] Figure 4 It is a schematic diagram of the connection between the adjustable connector and the straight thread reverse thread sleeve;

[0032] Figure 5 It is a schematic diagram of the adjustable connector connected with the high-strength bolt and the straight-thread reverse-thread sleeve.

[0033] Figure 6 This is a top view of the structure connecting the embedded end plate in the precast reinforced concrete beam with the straight thread reverse thread sleeve and the longitudinal reinforcement in the beam.

[0034] Figure 7 It is an axial cross-sectional view of the structure connecting the embedded end plate in the precast reinforced concrete beam with the straight thread reverse thread sleeve and the longitudinal reinforcement in the beam.

[0035] In the figure: 1-precast reinforced concrete column, 2-precast reinforced concrete beam, 3-high-strength bolt, 4-straight thread positive thread sleeve, 5-longitudinal reinforcement in the beam, 6-straight thread reverse thread sleeve, 7-adjustable connector, 8-embedded sleeve on the column, 9-pad, 10-positive and reverse thread screw, 11-locking nut, 12-end plate, 13-stiffening plate, 14-fastening nut, 15-column corbel, 16-secondary grouting connection section, 17-keyway. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] like Figure 1-Figure 7As shown, the precast reinforced concrete beam-column adjustable connection structure provided by the present invention mainly consists of a precast reinforced concrete column 1 with a column corbel 15, a precast reinforced concrete beam 2, a high-strength bolt 3, a straight thread positive thread sleeve 4, a longitudinal reinforcement 5 in the beam, a straight thread reverse thread sleeve 6, an adjustable connector 7, a pre-embedded sleeve 8 on the column, a pad 9 for fastening high-strength bolts at the side beam, a positive and reverse thread screw 10, a locking nut 11, a pre-embedded end plate 12 with a stiffening plate 13 in the beam, a fastening nut 14 and a secondary grouting connection section 16;

[0038] On the inner side connected to the beam, the high-strength bolt 3 passes through the embedded sleeve 8 on the prefabricated reinforced concrete column 1, and is screwed into the straight thread sleeve 4 through the thread at the end of the bolt. When it is a side column, the high-strength bolt 3 passes through the side column on the outside, and the thread is put on the pad 9 and then the fastening nut 14 is screwed on; when it is a middle column, both ends of the high-strength bolt 3 are connected to the straight thread sleeve 4.

[0039] The ends of the longitudinal reinforcement 5 in the upper and lower beams of the precast reinforced concrete beam are threaded. After a fastening nut 14 is put on the threaded end, it passes through the embedded end plate 12 with a horizontal stiffening plate 13 in the beam, and another fastening nut 14 is put on to tighten and fix it. Then the fastening nut 14 and the end plate 12 are spot welded to prevent loosening. The straight thread reverse thread sleeve 6 is fixed by groove welding or fillet welding on one side of the end plate 12 corresponding to the beam end, and is embedded in the precast reinforced concrete beam 2 together.

[0040] like Figure 3 As shown, the adjustable connector 7 consists of three parts: a straight thread positive thread sleeve 4, a positive and negative thread screw 10 and a locking nut 11; one end of the positive and negative thread screw 10 is a positive thread, which can be screwed into the straight thread positive thread sleeve 4, and the other end is a negative thread, which can be screwed into the straight thread negative thread sleeve 6; the inner thread of the locking nut 11 is consistent with the positive and negative thread screw 10, with an inner positive thread, and can be sleeved on the positive thread end of the positive and negative thread screw 10 for adjustment.

[0041] The two ends of the adjustable connector 7 are respectively connected to the high-strength bolt 3 and the straight-thread reverse-thread sleeve 6, and the secondary grouting material is poured into the connection gap between the precast reinforced concrete column 1 connected by the adjustable connector 7 and the precast reinforced concrete beam 2 to form a secondary grouting connection section 16 and the gap between the embedded sleeve 8 and the high-strength bolt 3.

[0042] Figure 4 and Figure 5 A schematic diagram is given of the adjustable connector 7 being connected successively to the straight thread reverse thread sleeve 6 and the high strength bolt 3 .

[0043] According to the connection method of the present invention, in the factory prefabrication stage, firstly, according to the positioning and quantity of the longitudinal reinforcement 5 in the prefabricated reinforced concrete beam 2, the end plate 12 is processed and manufactured according to the design drawings, a stiffening plate 13 is provided on one side of the end plate 12, and a straight thread reverse thread sleeve 6 is welded and fixed on the other side. Then, the end plate 12 is positioned and fixed at the corresponding positions of the longitudinal reinforcement 5 in the upper and lower beams of the prefabricated reinforced concrete beam 2 according to the design drawings.

[0044] The longitudinal bars and stirrups in the precast reinforced concrete beams are tied according to the design documents. The ends of the longitudinal bars 5 in the precast reinforced concrete beams 2 are processed into straight thread heads by rolling technology. After a fastening nut 14 is put on, they pass through the end plates 12 set at the corresponding positions one by one, and then a fastening nut 14 is put on the other side of the end plate 12 to tighten it. Then, the fastening nut 14 and the end plate 12 are spot welded to prevent loosening.

[0045] The position of the straight thread reverse thread sleeve 6 embedded in the precast reinforced concrete column 1 corresponding to the precast reinforced concrete beam 2 is reserved for the column embedded sleeve 8, and the longitudinal reinforcement and stirrups in the column are tied according to the design documents.

[0046] A plurality of keyways 17 are provided on the side surface of the connection side between the precast reinforced concrete column 1 and the precast reinforced concrete beam 2 and the side surface of the connection side between the precast reinforced concrete beam 2 and the precast reinforced concrete column 1, and then concrete is poured to complete the production of the precast reinforced concrete column 1 and the precast reinforced concrete beam 2.

[0047] Before the prefabricated reinforced concrete beam 2 is put into place, the reverse thread end of the positive and reverse thread screw 10 of the adjustable connecting piece 7 with the straight thread positive thread sleeve 4 and the locking nut 11 is screwed into the straight thread reverse thread sleeve 6 embedded in the prefabricated reinforced concrete beam 2. In order to facilitate the subsequent installation and adjustment of the beam, a gap of 1 to 2 threads can be left.

[0048] The prefabricated reinforced concrete column 1 is installed on site, and then the prefabricated reinforced concrete beam 2 is hoisted.

[0049] When installing the side column-beam rigid connection, the high-strength bolt 3 can be inserted into the embedded sleeve 8 on the column before the prefabricated reinforced concrete beam 2 is put in place, and the pad 9 is put on the outside of the column and the fastening nut 14 is screwed on;

[0050] When the middle column-beam is connected and installed, before the prefabricated reinforced concrete beam 2 on one side is in place and the prefabricated reinforced concrete beam 2 on the other side is in place, the high-strength bolt 3 is inserted into the embedded sleeve 8 on the column;

[0051] Then, after the prefabricated reinforced concrete beam 2 and the prefabricated reinforced concrete column 1 are aligned and in place, the end of the high-strength bolt 3 is screwed into the straight thread sleeve 4 of the forward and reverse thread screw 10 of the adjustable connector 7, and after tightening, the locking nut 11 is tightened to prevent the straight thread sleeve 4 from loosening, that is, to achieve locking. The tightening torque should meet the requirements of the "Technical Code for Mechanical Connection of Reinforcement Bars" JGJ107.

[0052] For the center column-beam rigid connection, perform the above operations on both ends of the node respectively. For the side column-beam rigid connection, after the adjustable connector is connected, tighten the fastening nuts 14 on the outside of the side columns at the same time.

[0053] Finally, repeat the above connection method for all adjustable connectors one by one. After all the connection joints are installed and inspected, use secondary grouting material to fill the connection gap between the precast reinforced concrete beam 2 and the precast reinforced concrete column 1, and the embedded sleeve 8 on the column to form a whole, completing the rigid connection of the entire precast reinforced concrete beam and column.

[0054] The number and diameter of the high-strength bolts used are calculated and determined according to the principle of matching the tensile bearing capacity of all bolts with the tensile bearing capacity of all steel bars in the beam. The effective diameter and material of the positive and negative thread screws 10 of the adjustable connector 7 match the high-strength bolts connected, effectively ensuring the strength and deformation performance requirements of the connection structure from many aspects.

[0055] The straight thread positive thread sleeve 4 of the adjustable connector 7 and the straight thread reverse thread sleeve 6 embedded in the prefabricated reinforced concrete beam 2 can adopt the sleeve form that meets the requirements of "Sleeves for Mechanical Connection of Reinforcement Bars" JGT 163, which is convenient for procurement during factory prefabrication.

[0056] The adjustable connector 7 with the straight thread sleeve 4, the straight and reverse thread screw 10 and the locking nut 11 has a pre-tightening function, which can eliminate the deformation between the connectors. When the reverse thread end of the straight and reverse thread screw 10 is screwed into the precast reinforced concrete beam 2, a gap of about 2 mm is reserved, and after the end of the high-strength bolt passing through the precast reinforced concrete column 1 is connected and tightened with the straight thread sleeve 4, the end of the precast reinforced concrete beam 2 is tightened, and then the locking nut 11 is tightened, so that the adjustable connector 7 generates a pre-tightening force, eliminating the deformation caused by the connection gap of the various components of the connector.

[0057] The length of the adjustable connector 7 directly determines the size of the secondary grouting connection section 16 between the precast reinforced concrete beam 2 and the precast reinforced concrete column 1. The size can generally be controlled within 150 mm to 200 mm. Compared with the current method of using cast-in-place concrete post-casting sections, it greatly reduces the workload of pouring construction of node connections between precast components and effectively shortens the construction period.

[0058] Under the condition of ensuring the stiffness of the end plate, when the diameter of the longitudinal reinforcement in the beam is small, the connection between the longitudinal reinforcement in the beam and the end plate can also be fixed by a fastening nut.

[0059] When used for side columns, high-strength bolts can also be processed into a form with a fixed large hexagonal nut on one side and a threaded nut on the other side, which is convenient for on-site bolt tightening and installation.

[0060] To avoid cracks in the post-cast connection section, before pouring the secondary grouting material connection section, two Φ8~Φ10 stirrups or Φ4~Φ6 steel mesh fixed on three sides can be fixed between the precast reinforced concrete beam and the precast reinforced concrete column connection section, and then the secondary grouting material can be poured through embedded sleeves on this connection section and column to form a whole at the node.

Claims

1. An adjustable prefabricated reinforced concrete beam-column connection structure, characterized in that: It includes precast reinforced concrete columns, precast reinforced concrete beams, high-strength bolts, embedded sleeves on columns, embedded parts at beam ends, adjustable connectors and secondary grouting connection sections; the embedded sleeves on columns are embedded in precast reinforced concrete columns, and the embedded parts at beam ends are embedded in precast reinforced concrete beams; the high-strength bolts pass through the embedded sleeves on columns, and the two ends of the adjustable connectors are respectively connected to the high-strength bolts and the embedded parts at beam ends; the secondary grouting material is poured into the connection gap between the precast reinforced concrete column and the precast reinforced concrete beam connected by the adjustable connector to form a secondary grouting material connection section; the embedded parts at beam ends include longitudinal reinforcement in the beam, straight threaded reverse thread sleeves, end plates and fastening nuts, two or more longitudinal reinforcements in the beams are connected to the end plates through fastening nuts, and the end plates are connected to the straight threaded reverse thread sleeves.

2. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 1, characterized in that: The adjustable connecting piece includes a straight thread positive thread sleeve, a positive and negative thread screw and a locking nut; one end of the positive and negative thread screw is a positive thread, which can be screwed into the straight thread positive thread sleeve, and the other end is a negative thread, which can be screwed into the straight thread negative thread sleeve; the inner thread of the locking nut is consistent with the positive and negative thread screw, with an inner positive thread, and is sleeved on the positive thread end of the positive and negative thread screw for adjustment.

3. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 1, characterized in that: The dimension of each side of the end plate is 10mm-20mm wider than the corresponding longitudinal reinforcement arrangement dimension in the beam, and a horizontal stiffening plate is arranged in the middle of the end plate toward the inside of the beam.

4. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 1, characterized in that: The end plate is opened at the position corresponding to the longitudinal reinforcement in the beam, and the diameter of the hole is 0.5mm-1mm larger than the longitudinal reinforcement in the beam; the end of the longitudinal reinforcement in the beam is processed into a threaded form, and the length of the thread is determined according to the diameter of the longitudinal reinforcement in the beam, the thickness of the end plate and the thickness of 1 fastening nut + 2 to 3 threads.

5. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 1, characterized in that: The inner diameter of the embedded sleeve on the column is 20mm-25mm larger than the connected high-strength bolt, and a column corbel is provided at the designated position of the precast reinforced concrete column.

6. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 2, characterized in that: Both ends of the high-strength bolts have positive threads. When used in the side column-beam connection node, one end of the high-strength bolt is connected to the pad and tightening nut, and the other end is screwed into the straight thread positive thread sleeve.

7. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 2, characterized in that: Both ends of the high-strength bolts have positive threads, and when used in the center column-beam connection node, both ends are screwed into straight thread positive thread sleeves.

8. The adjustable prefabricated reinforced concrete beam-column connection structure according to claim 6, characterized in that: The connection positions of the high-strength bolts, pads and fastening nuts on the outside of the precast reinforced concrete column side columns are pre-processed into local wedge-shaped grooves with a concave depth of 20mm-25mm.

9. A method for connecting adjustable prefabricated reinforced concrete beams and columns, characterized in that: 1) According to the positioning and quantity of the longitudinal reinforcement in the precast concrete beam, the end plate is made, a stiffening plate is set on one side of the end plate, and a straight thread reverse thread sleeve is welded and fixed on the other side; 2) The ends of the longitudinal reinforcements in the beam are processed into straight threaded threads by rolling technology; the end plates at the positions of the upper and lower reinforcements in the beam are respectively installed and fixed at the corresponding positions of the longitudinal reinforcements in the beam, the longitudinal reinforcements in the beam are covered with fastening nuts on one side and passed through the end plates, and fastening nuts are also covered on the other side and tightened, and the fastening nuts are spot welded to the end plates, and then concrete is poured to complete the production of prefabricated reinforced concrete beams; 3) A pre-buried sleeve is set at a designated position on the precast reinforced concrete column, and then concrete is poured to complete the production of the precast reinforced concrete column; 4) First install the prefabricated reinforced concrete column in place, then screw one end of the adjustable connector into the straight thread reverse thread sleeve embedded in the prefabricated reinforced concrete beam one by one, and then hoist the prefabricated reinforced concrete beam; 5) When installing the side column-beam connection, insert the high-strength bolts into the embedded sleeves on the column before the prefabricated reinforced concrete beam is in place, put the pad on the outside of the column and screw the fastening nuts; when installing the middle column-beam connection, insert the high-strength bolts into the embedded sleeves on the column before the prefabricated reinforced concrete beam on one side is in place and the prefabricated reinforced concrete beam on the other side is in place; 6) After the beam is aligned and in place on the column bracket, screw the high-strength bolts into the straight thread sleeves of the adjustable connector one by one, and then tighten the locking nuts on the adjustable connector; 7) After all the connection joints are installed and inspected, pour the secondary grouting material in the gap between the connection section of the precast reinforced concrete beam and the precast reinforced concrete column, and the embedded sleeve on the column and the high-strength bolt connection to form a whole.

10. The method for connecting adjustable prefabricated reinforced concrete beams and columns according to claim 9, characterized in that: The adjustable connector includes a straight thread sleeve, a straight and reverse thread screw and a locking nut; when the reverse thread end of the straight and reverse thread screw is screwed into the precast reinforced concrete beam, a gap of about 2 mm is reserved, and after the end of the high-strength bolt passing through the precast reinforced concrete column is connected and tightened with the straight thread sleeve, the end of the precast reinforced concrete beam is tightened, and then the locking nut is tightened to make the adjustable connector generate a pre-tightening force to eliminate the deformation caused by the connection gap of the various components of the connector.

11. The method for connecting adjustable prefabricated reinforced concrete beams and columns according to claim 9, characterized in that: Before pouring the secondary grouting material connection section, stirrups or steel mesh are set between the precast reinforced concrete beam and the precast reinforced concrete column connection section, and then the secondary grouting material is poured to form a whole at the node.

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