CN116464297A - Construction method for SRC column and RC beam joint of steel reinforced concrete structure - Google Patents

Abstract

The invention discloses a construction method of SRC column and RC beam nodes of a steel reinforced concrete structure, which adopts the following process flow: RC beam longitudinal reinforcement deepening, SRC column longitudinal reinforcement deepening, steel column deepening, processing and manufacturing, steel column installation, SRC column steel reinforcement installation, template installation, RC beam steel reinforcement installation, concrete pouring and maintenance, wherein the connection mode of the RC beam steel reinforcement and the steel column is determined through the RC beam longitudinal reinforcement deepening step, the contact processing mode of the column steel reinforcement and the steel corbel and the installation mode of the core area stirrup are determined through the SRC column longitudinal reinforcement deepening step, and the opening positions of the flange plates and the web plates of the shaped steel column and the positions of the steel corbel are determined through the steel column deepening step. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure is convenient to construct and high in precision, improves construction quality and efficiency, and reduces construction cost.

Description

Construction method for SRC column and RC beam joint of steel reinforced concrete structure

Technical Field

The invention relates to the technical field of building construction, and particularly discloses a construction method for SRC (reinforced concrete) column and RC beam joints of a steel reinforced concrete structure.

Background

The three-house one-house construction project mainly comprises a museum, a library, a cultural house, a theater, a sinking square and an outdoor affiliated landscape. The main functions of the building are exhibition halls, rest halls, reading rooms, tibetan books libraries, reporting halls, theatres, literature classrooms, offices and the like. The museum, the library and the theatre basement all adopt steel reinforced concrete structure systems, the theatre ground structure adopts a steel structure, the number of layers of the museum and the library structure is five layers and four layers of the theatre, the SRC column type is various, and the SRC column type comprises a cross steel column, an H steel column, a box steel column, a steel column and the like; the number of the node RC beams is large, the span is large, the number of the beam-column node reinforcing steel bars is large, the number of the connecting beams is large, and the site construction difficulty is high.

Therefore, the number of connecting beams of the existing three-shop one-yard construction project is large, the field construction difficulty is high, and the technical problem to be solved is urgent at present.

Disclosure of Invention

The invention provides a construction method for SRC (reinforced concrete) columns and RC beam joints of a steel reinforced concrete structure, and aims to solve the technical problems of large number of connecting beams in construction projects of three houses and one yard and high field construction difficulty.

The invention relates to a construction method of SRC column and RC beam joints of a steel reinforced concrete structure, which comprises the following steps:

deepening of RC beam longitudinal ribs: determining a connection mode of RC beam steel bars and steel columns, wherein RC beam longitudinal bar deepening comprises X-direction beam steel bar deepening and Y-direction beam steel bar deepening and oblique beam steel bar deepening; when RC beam steel bars are deepened, the corner longitudinal bars are deepened firstly, then the middle longitudinal bars are deepened, and finally two rows of longitudinal bars and three rows of longitudinal bars are deepened;

deepening SRC column longitudinal ribs: determining a touch processing mode of the column steel bars and the steel corbels and an installation mode of the stirrups in the core area;

deepening the section steel column: determining the position of a hole formed in a flange plate and a web plate of a steel column and the position of a steel bracket;

processing and manufacturing: the processing and manufacturing of the reinforcing steel bars are carried out on a construction site by adopting a numerical control machine, and the reinforcing steel bars are processed and manufactured strictly according to a blanking list according to the deepened reinforcing steel bar connection form;

and (3) installing a section steel column: installing a profile steel column by adopting field hoisting;

and (3) SRC column reinforcement installation: installing SRC beam steel bars;

and (3) template installation: installing a template;

and (3) installing RC beam steel bars: installing RC beam steel bars;

and (3) concrete pouring: the self-compacting concrete is adopted preferentially when the concrete is poured, if the common concrete is adopted, the grain size of coarse aggregate is controlled, the grain size of the coarse aggregate is not more than 25mm, and the position of a steel plate bracket is avoided when the concrete is vibrated;

curing: and curing the steel reinforced concrete structure which is just poured.

Further, in the step of deepening the RC beam longitudinal ribs,

when the corner through rib 30 is deepened, 1:6 slope pass mode adopts 1: carrying out horizontal haunching treatment on the beam ends in a 6-slope folding mode;

the steel column web plate is perforated or an in-column anchoring mode is adopted, so that the length of the horizontal section of the longitudinal rib is not less than 0.4 times of the anchoring length and extends to the steel column web plate;

when the middle longitudinal ribs are deepened, steel plate brackets are welded with the steel columns, the welding length is welded at least 5d in double sides, one side contains at least 10d, and the middle longitudinal ribs and the steel column flange plates are processed in the same corner longitudinal ribs in a collision-free middle longitudinal rib deepening mode;

when two and three rows of longitudinal ribs are deepened, the two and three rows of longitudinal ribs are optimized and canceled or optimized into one row by adopting an equal strength or equal area mode, and the upper part or the bottom of the beam is optimized by taking no more than two rows of longitudinal ribs as an optimization principle so as to reduce the superposed heights of the beam steel ribs in different directions;

and the two rows of angle ribs are optimized to be the same as the first row of angle ribs, and sleeve connection or perforation anchoring mode is adopted for processing when the two rows of middle ribs collide with the steel column flange plate.

Further, in the step of deepening the SRC column longitudinal ribs,

the positions of the longitudinal ribs of the column are determined according to the number of the designed reinforcing steel bars and the thickness of the protective layer, and the ribs in the middle of the column are uniformly distributed among the corner ribs;

after the position is determined, the collision quantity of the column longitudinal ribs and the bracket is analyzed according to the position and the size of the steel plate bracket, and fine adjustment is carried out on the column ribs;

the method adopts a mode of forming a U-shaped hole on the steel bracket to ensure that the column longitudinal bar smoothly passes through; when the SRC column longitudinal ribs are deepened, node modeling is carried out by utilizing a BIM technology;

the design of the stirrup in the core area mostly adopts a multi-limb closed hoop, optimizes each double-limb closed hoop into 2U-shaped stirrups or 4L-shaped stirrups, and forms the closed stirrup through welding connection.

Further, in the step of deepening the section steel column,

when the profile steel column is deepened, the length of the steel plate bracket is determined according to the width of the flange plate of the profile steel column, the width is determined according to the welding mode after RC beam reinforcement is deepened, and if single-sided welding is adopted, the width of the steel plate bracket is not less than 10d; if double-sided welding is adopted, the width of the steel plate bracket is not less than 5d;

the steel column is deeply designed in a double-sided welding mode, so that the bracket width of the steel plate is reduced;

after the plane size of the steel plate bracket is determined, U-shaped holes are formed according to the positions of the column longitudinal ribs;

the elevation of the steel plate bracket and the position of the steel column opening are directly determined according to the position of the RC beam longitudinal bar, the height difference of the two direction beam longitudinal bar perforation positions is at least different by one steel bar diameter, and the opening size is selected according to a preset aperture table.

Further, in the step of deepening the section steel column,

the hole rate of the web is not more than 20% of the area of the web, and reinforcing treatment is carried out when the hole rate exceeds 20%; and the height difference of the perforation positions of the longitudinal ribs in the two directions of the web plate is at least d+3mm, and the height difference of the perforation positions of the longitudinal ribs in the two directions of the web plate is at least d+5mm for the holes of the reinforcing steel bars with diameters not smaller than 28 mm.

Further, in the step of processing and manufacturing, the steel column is manufactured in a factory, and the component is manufactured according to a deep design detailed drawing.

Further, the step of installing the steel column comprises the following steps:

when the profile steel column is hoisted, the column feet are protected by using the sizing block;

when the member is positioned 20cm above the SRC column position during hoisting, the member is properly stabilized, and the position of the steel column is adjusted to enable the column foot bolt holes of the steel column to be basically consistent with the pre-buried foundation bolt positions;

slowly descending the profile steel column, gradually putting the pre-buried foundation bolts into the bolt holes of the column feet of the profile steel column, and avoiding the phenomenon that the foundation bolts collide with the column feet of the profile steel column when the profile steel column falls;

and (3) carrying out fine adjustment on the profile steel column according to the elevation of the steel plate bracket determined by the deepening design, installing the temporary fixing part after the adjustment is finished, screwing the bolt, and carrying out fixing treatment.

Further, the step of installing the SRC column reinforcement comprises the following steps:

checking whether the column steel bar has deviation according to the U-shaped hole position on the steel plate bracket, and if the steel bar is deviated, adopting 1:6, adjusting the positions of the steel bars in a slope folding manner to ensure that the U-shaped hole positions of the steel plate brackets are consistent;

sleeving stirrups on reserved column ribs, connecting column longitudinal steel bars, and enabling the column longitudinal ribs to smoothly pass through U-shaped holes of steel plate brackets after connection;

marking the boundary positions of the encryption area and the non-encryption area on the column reinforcement, binding the reinforcement stirrups according to the sequence from top to bottom by marking, welding 2U-shaped hoops or 4L-shaped hoops into a closed hoop when the reinforcement stirrups in the core area are installed, and ensuring that the welding positions are staggered when adjacent hoops are welded.

Further, in the step of installing the RC beam reinforcing steel bars,

reserving a side template when the beam template is installed, and sealing after the beam reinforcement is installed and accepted;

when the beam longitudinal bars are installed, the beam bottom row longitudinal bars are installed in one direction, then the beam bottom row longitudinal bars are installed in the other direction, and the beam steel bar installation is completed in the sequence from bottom to top in a crossing manner.

Further, the step of installing the RC beam reinforcement comprises the following steps:

installing perforated steel bars: when the beam is installed with the longitudinal bars in the same row, the perforated steel bar construction is needed, and the perforated steel bar installation is carried out according to the position of the holes on the steel column web plate or the flange plate; when the perforated steel bar is installed, the length of the perforated steel bar extending into the two side beams is controlled in a key way, so that the connection position of the steel bar is ensured to meet the specification and design requirements; after the perforated steel bar is installed, temporary fixing measures are taken for the steel bar;

welding the steel bars and the steel corbels: when the longitudinal steel bars of the beam are installed, the longitudinal steel bars and the flange plates of the steel columns are required to be in a vertical state and are tightly attached to the steel plate brackets so as to facilitate the welding construction of the steel bars and the steel plate brackets; the steel bars and the steel plate brackets are welded after the perforated steel bars are installed, and the welding areas are fixed when the steel bars are welded, so that the steel bars are prevented from being displaced in the welding process to influence the welding quality; the welding adopts a toe welding mode, the height of the welding seam is generally determined according to the diameter of the steel bar, the length of the welding seam is not less than 10d when in single-sided welding, and the length of the welding seam is not less than 5d when in double-sided welding;

and (3) sleeve connection: if two rows of longitudinal steel bars at the upper part or the bottom of the beam are still required to be laid after the node deepening design, sleeve connection mode can be adopted for the steel bars at the middle parts of the two rows; selecting corresponding sleeves to be welded with the steel columns according to the diameters of the two rows of ribs, and selecting the welding of the sleeves and the flange plates of the steel columns to be performed in a processing plant; and when the steel bar is installed on site, the steel bar is rotated, fastening of the steel bar is ensured, 1-2 complete threads of the steel bar threads are exposed after the steel bar threads are screwed, screwing torque is detected through a torque wrench, and the torque is ensured to meet the standard requirement.

The beneficial effects obtained by the invention are as follows:

the invention provides a construction method of SRC column and RC beam nodes of a steel reinforced concrete structure, which adopts the following process flow: RC beam longitudinal reinforcement deepening, SRC column longitudinal reinforcement deepening, steel column deepening, processing and manufacturing, steel column installation, SRC column steel reinforcement installation, template installation, RC beam steel reinforcement installation, concrete pouring and maintenance, wherein the connection mode of the RC beam steel reinforcement and the steel column is determined through the RC beam longitudinal reinforcement deepening step, the contact processing mode of the column steel reinforcement and the steel corbel and the installation mode of the core area stirrup are determined through the SRC column longitudinal reinforcement deepening step, and the opening positions of the flange plates and the web plates of the shaped steel column and the positions of the steel corbel are determined through the steel column deepening step. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure is convenient to construct and high in precision, improves construction quality and efficiency, and reduces construction cost.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of a construction method of SRC column and RC beam nodes of a steel reinforced concrete structure;

fig. 2 is a schematic plan view of a connecting node of a longitudinal steel bar of a middle beam according to the present invention;

FIG. 3 is a schematic cross-sectional view taken along the direction A-A in FIG. 2;

fig. 4 is a schematic cross-sectional view taken along the direction B-B in fig. 2.

Reference numerals illustrate:

10. a web; 20. steel corbels; 30. corner through ribs; 40. column longitudinal ribs; 50. and (5) hooping.

Detailed Description

In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 and fig. 2, a first embodiment of the present invention provides a construction method for a SRC pillar and RC beam node of a steel reinforced concrete structure, including the following steps:

step S100, deepening of the RC beam longitudinal ribs: determining a connection mode of RC beam steel bars and steel columns, wherein RC beam longitudinal bar deepening comprises X-direction beam steel bar deepening and Y-direction beam steel bar deepening and oblique beam steel bar deepening; and when the RC beam steel bars are deepened, the corner longitudinal bars are deepened firstly, then the middle longitudinal bars are deepened, and finally the two-row and three-row longitudinal bars are deepened.

The node deepening comprises RC (reinforce concrete construction, reinforced concrete) beam longitudinal reinforcement deepening, SRC (Steel Reinforced Concrete ) column longitudinal reinforcement deepening and steel column deepening, and the node deepening mainly carries out analysis treatment on the SRC column and the RC beam, and determines an arrangement mode of beam steel bars, a connection mode with the steel column, a multi-beam intersection steel bar cross treatment mode, column steel bar and steel column collision treatment and the like. The nodes are deepened, the model establishment is carried out on SRC columns and RC beam nodes by using the BIM technology, site construction is simulated, three-dimensional lofting is carried out, visual intersection is carried out on operators, and the construction problem is solved in advance. And when the nodes are deepened, numbering SRC and RC beam nodes layer by layer, ensuring that all beam nodes are counted, finding out the beam nodes which are identical after primary analysis, carrying out secondary numbering, and finally deepening according to the beam nodes with the secondary numbering. When deepening, the beam steel bars are deepened first, and the connection mode of the RC beam steel bars and the steel columns is determined; secondly, SRC column reinforcement deepening is carried out, and a touch processing mode of the column reinforcement and the steel corbel 20 and an installation mode of the stirrup 50 in a core area are determined; finally, deepening the steel column, and determining technical parameters such as the position of the opening of the flange plate and the web plate of the steel column, the position of the steel bracket and the like. In the deep design, the longitudinal stress steel bars at the bottom or the top of the RC beam are not suitable for more than two rows in principle, and one row is preferably adopted.

RC beam reinforcement deepening is the most important content of beam column node deepening, including X to beam reinforcement deepening, Y to beam reinforcement deepening and slant beam reinforcement deepening etc. need solve the beam longitudinal reinforcement cross anchorage, with the problem such as steel column connection, especially two rows of muscle, three rows of muscle how to be connected with the steel column or pass the problem of steel column. The main modes of connection of the beam longitudinal ribs and the steel columns are bypass, perforation, welding, sleeve connection or combined connection and the like, and the mode of combination connection of bypass and welding or perforation is generally adopted.

And when the RC beam steel bars are deepened, the corner longitudinal bars are deepened firstly, then the middle longitudinal bars are deepened, and finally the two-row and three-row longitudinal bars are deepened. When the corner through rib 30 is deepened, 1: the problem of collision with the steel column flange plate is solved by a 6-slope-folding passing mode, and 1: the beam end can be subjected to horizontal haunching treatment in a 6-slope folding mode so as to solve the problem of insufficient width of the beam section; the steel bar penetrating problem is solved by perforating on the steel bar web 10, and a column internal anchoring mode can be adopted, but the length of the horizontal section of the longitudinal steel bar is not less than 0.4 times of the anchoring length and extends to the steel bar web 10. When the middle longitudinal ribs are deepened, the steel plate bracket is welded with the steel column, the welding length is welded at least 5d in double sides, one side contains at least 10d, and the middle longitudinal ribs and the steel column flange plates are processed in the same corner longitudinal ribs in a collision-free middle longitudinal rib deepening mode. When two and three rows of longitudinal ribs are deepened, the two and three rows of longitudinal ribs are optimized and canceled or optimized into one row by adopting an equal strength or equal area mode, and the upper part or the bottom of the beam is optimized by taking no more than two rows of longitudinal ribs as an optimization principle so as to reduce the superposed heights of the beam steel ribs in different directions; and the two rows of angle ribs are optimized to be the same as the first row of angle ribs, and sleeve connection or perforation anchoring mode is adopted for processing when the two rows of middle ribs collide with the steel column flange plate. After the deep design is completed, the implementation can be carried out by the original design confirmation method.

Taking a two-layer beam column node of a museum of a three-hall-one-hospital project as an example, 4 beam junctions are arranged at the beam column node, the X-direction beam steel bars are optimized in two modes of perforation through and steel corbel welding, and the Y-direction beam is optimized in 1: the 6-slope through joint is welded with the steel corbel in two modes, and the deepened joint is shown in figures 2 to 4.

Step S200, deepening longitudinal ribs of SRC columns: and determining the touch processing mode of the column steel bars and the steel corbels and the installation mode of the stirrups in the core area.

The SRC column reinforcement is relatively simple in deepening, mainly positions of column longitudinal reinforcements are determined, the problem of collision between the column longitudinal reinforcements 40 and steel plate brackets and beam longitudinal reinforcements is solved, and the installation form of the core area stirrups 50 is determined. The positions of the longitudinal ribs of the column are determined according to the number of the designed reinforcing steel bars and the thickness of the protective layer, and the ribs in the middle of the column are uniformly distributed among the corner ribs; after the position is determined, the collision quantity of the column longitudinal ribs 40 and the bracket is analyzed according to the position and the size of the steel plate bracket, the column ribs are finely adjusted to solve the problem of collision with the beam longitudinal ribs, and then the column longitudinal ribs 40 are ensured to pass smoothly by adopting a mode of forming U-shaped holes in the steel bracket 20; and in deepening, the node modeling can be performed by using a BIM (Building Information Modeling) technology, so that the problem of collision between the column rib and the bracket and between the beam longitudinal rib can be intuitively and vividly solved. The design of the stirrup 50 in the core area adopts a multi-limb closed hoop, and each double-limb closed hoop can be optimized into 2U-shaped stirrups or 4L-shaped stirrups, and the closed stirrups are formed by welding connection.

Step S300, deepening the section steel column: and determining the position of the opening of the flange plate of the steel column and the position of the steel bracket of the web 10.

The deep design of the steel column is mainly to further define technical parameters such as a connection mode, a specification size and the like of the steel column on the basis of an original design drawing, and particularly to the size and the position of a web 10 or a flange opening and the size and the position of a steel plate bracket, and is generally carried out by adopting Tecla software. When deepening is carried out, the length of the steel plate bracket is determined according to the width of the steel column flange plate, the width is determined according to the welding mode after RC beam reinforcement deepening, and if single-sided welding is adopted, the width of the steel plate bracket is not less than 10d; if double-sided welding is adopted, the width of the steel plate bracket should be not less than 5d. The double-sided welding mode is preferably selected in the deepening design to reduce the width of the steel plate bracket, so that the steel plate bracket can lighten the collision degree with the column longitudinal ribs 40. After the plane size of the steel plate bracket is determined, U-shaped holes can be formed according to the positions of the longitudinal ribs of the column. The elevation of the steel plate bracket and the position of the steel column hole can be directly determined according to the position of the RC beam longitudinal bar, the height difference of the perforation positions of the two direction beams longitudinal bars is at least different by one steel bar diameter, and the hole size is selected according to the following table 1.

Table 1 pore diameter (mm) of conventional reinforcing steel bar perforation

The web hole rate is not more than 20% of the web area, and the reinforcement treatment should be carried out when the web hole rate exceeds 20%. And the height difference of the perforation positions of the longitudinal ribs in two directions is at least d+3mm, and the height difference of the perforation positions of the longitudinal ribs in two directions is at least d+5mm for the holes of the reinforcing steel bars with diameters not smaller than 28 mm. The pore size of the openings is selected according to Table 1.

Step S400, processing and manufacturing: the processing and manufacturing of the reinforcing steel bars are carried out on a construction site by adopting a numerical control machine, and the reinforcing steel bars are processed and manufactured strictly according to a blanking list according to the deepened reinforcing steel bar connection form.

The processing and manufacturing of the reinforcing steel bars are generally carried out on a construction site by adopting a numerical control machine, and according to the deepened reinforcing steel bar connection form, a sample turning person presents a reinforcing steel bar blanking list and strictly carries out processing and manufacturing according to the blanking list. The steel column is manufactured in a factory, in order to ensure accurate positioning of the components, the steel column is manufactured strictly according to a deep design detailed diagram, and technicians are arranged to monitor the steel column in a factory, so that the positions and the sizes of holes on the steel column and steel plate brackets are ensured to meet the deep design requirements.

Step S500, installing a steel column: and installing the profile steel column by adopting field hoisting.

The field hoisting of the profile steel column is generally carried out by using hoisting machinery such as a tower crane, an automobile crane and the like. When the profiled steel column is hoisted, in order to prevent damage to the edges, the column base of the profiled steel column should be protected by using a sizing block. When the member is located 20cm above the SRC column position during lifting, proper stability is carried out first, the position of the steel column is adjusted to enable the positions of column foot bolt holes of the member to be basically consistent with the positions of pre-buried foundation bolts, then the steel column is slowly lowered, the pre-buried foundation bolts are gradually placed into the column foot bolt holes of the steel column, and the phenomenon that the foundation bolts collide with the column feet of the steel column during falling is avoided. And finally, finely adjusting the profile steel column according to the elevation of the steel plate bracket determined by the deepening design. And after the adjustment is finished, the temporary fixing part is installed, the bolts are screwed, and fixing treatment is performed.

The processing and manufacturing of the profile steel column are performed in factories, personnel are arranged to carry out factory supervision, the sizes and positions of the steel plate brackets and the sizes and positions of the holes are ensured to meet the deep design requirements, and the holes are formed by adopting corresponding machine tools or special equipment during the holes, so that the holes are strictly forbidden to be cut by adopting oxygen.

When the steel bars are welded on the bracket, one direction can be directly welded, the other direction is to additionally arrange a backing plate between the bracket and the steel bars for welding, and the position of the backing plate is to be lofted according to a specific construction drawing and processed in factories.

Step S600, SRC column reinforcement installation: and installing the SRC beam steel bars.

Checking whether the column steel bar has deviation according to the U-shaped hole position on the steel plate bracket, and if the steel bar is deviated, adopting 1: and 6, adjusting the positions of the steel bars in a slope folding manner so as to ensure that the U-shaped hole positions of the steel plate brackets are consistent. And then the stirrup 50 is sleeved on the reserved column bar, and then column longitudinal bar connection is carried out, so that the column longitudinal bar 40 smoothly passes through the U-shaped holes of the steel plate bracket after connection. And finally marking the boundary positions of the encryption area and the non-encryption area on the column reinforcement, and binding the stirrups according to the sequence from top to bottom according to the marks. When the stirrup 50 in the core area is installed, 2U-shaped hoops or 4L-shaped hoops are welded into a closed hoop, and the welding positions of adjacent stirrups are ensured to be staggered when the adjacent stirrups are welded.

Step S700, template installation: and installing the template.

And installing the template of the steel reinforced concrete structure.

Step S800, RC beam reinforcement installation: and (5) installing the RC beam steel bars.

In order to ensure the beam reinforcement installation quality, a side template is reserved when the beam template is installed, and the beam reinforcement is sealed after the beam reinforcement is installed and accepted. When the beam longitudinal bars are installed, the beam bottom row longitudinal bars are installed in one direction, then the beam bottom row longitudinal bars are installed in the other direction, and the beam steel bar installation is completed in the sequence from bottom to top in a crossing manner.

(1) Perforated rebar installation

When the beam is installed with the longitudinal bars, the perforated steel bar construction is needed first, and the perforated steel bar installation is carried out according to the perforated positions on the steel column web 10 or the flange plates. When the perforated steel bar is installed, the length of the perforated steel bar extending into the two side beams is controlled in a key way, and the connection position of the steel bar is ensured to meet the specification and design requirements. And after the perforated steel bar is installed, temporary fixing measures are taken for the steel bar.

(2) Welding of steel bars and steel corbels

When the longitudinal steel bars of the beam are installed, the longitudinal steel bars and the flange plates of the steel columns are required to be in a vertical state, and the longitudinal steel bars and the flange plates of the steel columns are tightly attached to steel plate brackets so that the steel bars and the steel plate brackets can be welded and constructed conveniently. The steel bar and the steel plate bracket are welded after the perforated steel bar is installed, and the welding area is fixed when the steel bar is welded, so that the steel bar is prevented from displacement in the welding process to influence the welding quality. The welding adopts a toe welding mode, the welding seam height is generally determined according to the diameter of the steel bar, the welding seam length during single-sided welding is not less than 10d (d is the diameter of the stirrup), the welding seam length during double-sided welding is not less than 5d, and the double-sided welding is adopted preferentially during construction.

(3) Sleeve connection

If two rows of longitudinal steel bars at the upper part or the bottom of the beam are still required to be laid through the node deepening design, sleeve connection mode can be adopted for the steel bars at the middle parts of the two rows. According to the welding of the corresponding sleeve and the steel column, which are selected according to the diameters of the two rows of ribs, the welding of the sleeve and the steel column flange plate should be selected to be carried out in a processing plant, the welding quality can be affected when the welding is carried out on site, and the flange plate is easy to damage. And when the steel bar is installed on site, the steel bar is rotated, fastening of the steel bar is ensured, 1-2 complete threads of the steel bar threads are exposed after the steel bar threads are screwed, screwing torque is detected through a torque wrench, and the torque is ensured to meet the standard requirement.

Step S900, concrete pouring: when the concrete is poured, self-compacting concrete is preferably adopted, if common concrete is adopted, the grain size of coarse aggregate is controlled, the grain size of the coarse aggregate is not more than 25mm, and the position of a steel plate bracket is avoided during vibration.

Step S1000, maintenance: and curing the steel reinforced concrete structure which is just poured.

The construction method of the SRC column and the RC beam node of the profile steel concrete structure provided by the embodiment is described in the following specific embodiment:

shu Cheng A-yard construction project of three-yard county is located at the northeast corner of the intersection of the Huagai road and the Nanxi road in Shu Cheng county, the planned total use area is 60354.47 square meters, the total building area is about 100976.21 square meters, the underground building area is 38738.54 square meters, and the construction project mainly comprises a museum, a library, a cultural house, a theater, a sinking square and outdoor affiliated landscapes. The main functions of the building are exhibition halls, rest halls, reading rooms, tibetan books libraries, reporting halls, theatres, literature classrooms, offices and the like. The museum, the library and the theatre basement all adopt steel reinforced concrete structure systems, the theatre ground structure adopts a steel structure, the number of layers of the museum and the library structure is five layers and four layers of the theatre, the SRC column type is various, and the SRC column type comprises a cross steel column, an H steel column, a box steel column, a steel column and the like; the number of the node RC beams is large, the span is large, the number of the beam-column node reinforcing steel bars is large, the number of the connecting beams is large, and the site construction difficulty is high.

Taking a two-layer beam column node of a museum of a three-hall-one-hospital project as an example, 4 beam junctions are arranged at the beam column node, the X-direction beam steel bars are optimized in two modes of perforation through and steel corbel welding, and the Y-direction beam is optimized in 1: the 6-slope through joint is welded with the steel corbel in two modes, and the deepened joint is shown in figures 3 to 4. The corner through bars 30 are blocked by the steel bars, and the steel bars can be pressed by 1:6, bending and passing through, and treating the beam ends with armpits. U-shaped holes are formed at the positions corresponding to the steel corbels 20 in the collision positions with the column longitudinal ribs 40 so as to facilitate the penetration of the column ribs. The corner through ribs are welded on the steel corbel in double sides, and the length of the welding line is more than or equal to 5d.

Compared with the prior art, the construction method for the SRC column and RC beam joint of the steel reinforced concrete structure provided by the embodiment adopts the following process flow: RC beam longitudinal reinforcement deepening, SRC column longitudinal reinforcement deepening, steel column deepening, processing and manufacturing, steel column installation, SRC column steel reinforcement installation, template installation, RC beam steel reinforcement installation, concrete pouring and maintenance, wherein the connection mode of the RC beam steel reinforcement and the steel column is determined through the RC beam longitudinal reinforcement deepening step, the contact processing mode of the column steel reinforcement and the steel corbel and the installation mode of the core area stirrup are determined through the SRC column longitudinal reinforcement deepening step, and the opening positions of the flange plates and the web plates of the shaped steel column and the positions of the steel corbel are determined through the steel column deepening step. The construction method for the SRC column and RC beam joint of the steel reinforced concrete structure is convenient to construct and high in precision, improves construction quality and efficiency, and reduces construction cost; through node deepening, and utilize BIM technique to carry out model establishment to SRC post and RC roof beam node, simulate site operation, carry out three-dimensional lofting, carry out visual bottom crossing to the operating personnel, solve construction problem in advance.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure is characterized by comprising the following steps of:

deepening of RC beam longitudinal ribs: determining a connection mode of RC beam steel bars and steel columns, wherein RC beam longitudinal bar deepening comprises X-direction beam steel bar deepening and Y-direction beam steel bar deepening and oblique beam steel bar deepening; when RC beam steel bars are deepened, the corner longitudinal bars are deepened firstly, then the middle longitudinal bars are deepened, and finally two rows of longitudinal bars and three rows of longitudinal bars are deepened;

deepening SRC column longitudinal ribs: determining a touch processing mode of the column steel bars and the steel corbels and an installation mode of the stirrups in the core area;

deepening the section steel column: determining the position of a hole formed in a flange plate and a web plate of a steel column and the position of a steel bracket;

processing and manufacturing: the processing and manufacturing of the reinforcing steel bars are carried out on a construction site by adopting a numerical control machine, and the reinforcing steel bars are processed and manufactured strictly according to a blanking list according to the deepened reinforcing steel bar connection form;

and (3) installing a section steel column: installing a profile steel column by adopting field hoisting;

and (3) SRC column reinforcement installation: installing SRC beam steel bars;

and (3) template installation: installing a template;

and (3) installing RC beam steel bars: installing RC beam steel bars;

and (3) concrete pouring: the self-compacting concrete is adopted preferentially when the concrete is poured, if the common concrete is adopted, the grain size of coarse aggregate is controlled, the grain size of the coarse aggregate is not more than 25mm, and the position of a steel plate bracket is avoided when the concrete is vibrated;

curing: and curing the steel reinforced concrete structure which is just poured.

2. The construction method of SRC column and RC beam joint of steel reinforced concrete structure according to claim 1, wherein in the step of deepening the longitudinal ribs of the RC beam,

when the corner through rib 30 is deepened, 1:6 slope pass mode adopts 1: carrying out horizontal haunching treatment on the beam ends in a 6-slope folding mode;

the steel column web plate is perforated or an in-column anchoring mode is adopted, so that the length of the horizontal section of the longitudinal rib is not less than 0.4 times of the anchoring length and extends to the steel column web plate;

when the middle longitudinal ribs are deepened, steel plate brackets are welded with the steel columns, the welding length is welded at least 5d in double sides, one side contains at least 10d, and the middle longitudinal ribs and the steel column flange plates are processed in the same corner longitudinal ribs in a collision-free middle longitudinal rib deepening mode;

when two and three rows of longitudinal ribs are deepened, the two and three rows of longitudinal ribs are optimized and canceled or optimized into one row by adopting an equal strength or equal area mode, and the upper part or the bottom of the beam is optimized by taking no more than two rows of longitudinal ribs as an optimization principle so as to reduce the superposed heights of the beam steel ribs in different directions;

and the two rows of angle ribs are optimized to be the same as the first row of angle ribs, and sleeve connection or perforation anchoring mode is adopted for processing when the two rows of middle ribs collide with the steel column flange plate.

3. The construction method of SRC column and RC beam joint of steel reinforced concrete structure according to claim 1, wherein in the step of deepening the vertical bars of the SRC column,

the positions of the longitudinal ribs of the column are determined according to the number of the designed reinforcing steel bars and the thickness of the protective layer, and the ribs in the middle of the column are uniformly distributed among the corner ribs;

after the position is determined, the collision quantity of the column longitudinal ribs and the bracket is analyzed according to the position and the size of the steel plate bracket, and fine adjustment is carried out on the column ribs;

the method adopts a mode of forming a U-shaped hole on the steel bracket to ensure that the column longitudinal bar smoothly passes through; when the SRC column longitudinal ribs are deepened, node modeling is carried out by utilizing a BIM technology;

the design of the stirrup in the core area mostly adopts a multi-limb closed hoop, optimizes each double-limb closed hoop into 2U-shaped stirrups or 4L-shaped stirrups, and forms the closed stirrup through welding connection.

4. The construction method of SRC column and RC beam joint of steel reinforced concrete structure according to claim 1, wherein in the step of deepening the steel column,

when the profile steel column is deepened, the length of the steel plate bracket is determined according to the width of the flange plate of the profile steel column, the width is determined according to the welding mode after RC beam reinforcement is deepened, and if single-sided welding is adopted, the width of the steel plate bracket is not less than 10d; if double-sided welding is adopted, the width of the steel plate bracket is not less than 5d;

the steel column is deeply designed in a double-sided welding mode, so that the bracket width of the steel plate is reduced;

after the plane size of the steel plate bracket is determined, U-shaped holes are formed according to the positions of the column longitudinal ribs;

the elevation of the steel plate bracket and the position of the steel column opening are directly determined according to the position of the RC beam longitudinal bar, the height difference of the two direction beam longitudinal bar perforation positions is at least different by one steel bar diameter, and the opening size is selected according to a preset aperture table.

5. The construction method of SRC column and RC beam joint of steel reinforced concrete structure according to claim 4, wherein in the step of deepening the steel column,

the hole rate of the web is not more than 20% of the area of the web, and reinforcing treatment is carried out when the hole rate exceeds 20%; and the height difference of the perforation positions of the longitudinal ribs in the two directions of the web plate is at least d+3mm, and the height difference of the perforation positions of the longitudinal ribs in the two directions of the web plate is at least d+5mm for the holes of the reinforcing steel bars with diameters not smaller than 28 mm.

6. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure according to claim 1, wherein in the step of processing and manufacturing, the steel column is manufactured in a factory, and the member is manufactured according to a deep design detail drawing.

7. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure according to claim 1, wherein the step of installing the steel column includes:

when the profile steel column is hoisted, the column feet are protected by using the sizing block;

when the member is positioned 20cm above the SRC column position during hoisting, the member is properly stabilized, and the position of the steel column is adjusted to enable the column foot bolt holes of the steel column to be basically consistent with the pre-buried foundation bolt positions;

slowly descending the profile steel column, gradually putting the pre-buried foundation bolts into the bolt holes of the column feet of the profile steel column, and avoiding the phenomenon that the foundation bolts collide with the column feet of the profile steel column when the profile steel column falls;

and (3) carrying out fine adjustment on the profile steel column according to the elevation of the steel plate bracket determined by the deepening design, installing the temporary fixing part after the adjustment is finished, screwing the bolt, and carrying out fixing treatment.

8. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure according to claim 1, wherein the step of installing the SRC column steel bar comprises the following steps:

checking whether the column steel bar has deviation according to the U-shaped hole position on the steel plate bracket, and if the steel bar is deviated, adopting 1:6, adjusting the positions of the steel bars in a slope folding manner to ensure that the U-shaped hole positions of the steel plate brackets are consistent;

sleeving stirrups on reserved column ribs, connecting column longitudinal steel bars, and enabling the column longitudinal ribs to smoothly pass through U-shaped holes of steel plate brackets after connection;

marking the boundary positions of the encryption area and the non-encryption area on the column reinforcement, binding the reinforcement stirrups according to the sequence from top to bottom by marking, welding 2U-shaped hoops or 4L-shaped hoops into a closed hoop when the reinforcement stirrups in the core area are installed, and ensuring that the welding positions are staggered when adjacent hoops are welded.

9. The construction method of SRC column and RC beam joint of steel reinforced concrete structure according to claim 1, wherein in the step of installing the RC beam steel bar,

reserving a side template when the beam template is installed, and sealing after the beam reinforcement is installed and accepted;

when the beam longitudinal bars are installed, the beam bottom row longitudinal bars are installed in one direction, then the beam bottom row longitudinal bars are installed in the other direction, and the beam steel bar installation is completed in the sequence from bottom to top in a crossing manner.

10. The construction method of the SRC column and RC beam joint of the steel reinforced concrete structure according to claim 1, wherein the step of installing the RC beam reinforcing steel comprises the following steps:

installing perforated steel bars: when the beam is installed with the longitudinal bars in the same row, the perforated steel bar construction is needed, and the perforated steel bar installation is carried out according to the position of the holes on the steel column web plate or the flange plate; when the perforated steel bar is installed, the length of the perforated steel bar extending into the two side beams is controlled in a key way, so that the connection position of the steel bar is ensured to meet the specification and design requirements; after the perforated steel bar is installed, temporary fixing measures are taken for the steel bar;

welding the steel bars and the steel corbels: when the longitudinal steel bars of the beam are installed, the longitudinal steel bars and the flange plates of the steel columns are required to be in a vertical state and are tightly attached to the steel plate brackets so as to facilitate the welding construction of the steel bars and the steel plate brackets; the steel bars and the steel plate brackets are welded after the perforated steel bars are installed, and the welding areas are fixed when the steel bars are welded, so that the steel bars are prevented from being displaced in the welding process to influence the welding quality; the welding adopts a toe welding mode, the height of the welding seam is generally determined according to the diameter of the steel bar, the length of the welding seam is not less than 10d when in single-sided welding, and the length of the welding seam is not less than 5d when in double-sided welding;

and (3) sleeve connection: if two rows of longitudinal steel bars at the upper part or the bottom of the beam are still required to be laid after the node deepening design, sleeve connection mode can be adopted for the steel bars at the middle parts of the two rows; selecting corresponding sleeves to be welded with the steel columns according to the diameters of the two rows of ribs, and selecting the welding of the sleeves and the flange plates of the steel columns to be performed in a processing plant; and when the steel bar is installed on site, the steel bar is rotated, fastening of the steel bar is ensured, 1-2 complete threads of the steel bar threads are exposed after the steel bar threads are screwed, screwing torque is detected through a torque wrench, and the torque is ensured to meet the standard requirement.