CN115262778A - Novel connection construction method for box steel column and reinforced concrete beam - Google Patents
Novel connection construction method for box steel column and reinforced concrete beam Download PDFInfo
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- CN115262778A CN115262778A CN202210944695.3A CN202210944695A CN115262778A CN 115262778 A CN115262778 A CN 115262778A CN 202210944695 A CN202210944695 A CN 202210944695A CN 115262778 A CN115262778 A CN 115262778A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 152
- 239000010959 steel Substances 0.000 title claims abstract description 152
- 238000010276 construction Methods 0.000 title claims abstract description 56
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 36
- 238000009434 installation Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 8
- 239000004567 concrete Substances 0.000 claims description 25
- 239000002002 slurry Substances 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 240000004282 Grewia occidentalis Species 0.000 claims description 4
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- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 230000009193 crawling Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009417 prefabrication Methods 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N Acetylene Chemical compound C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 241000233805 Phoenix Species 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
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- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/185—Connections not covered by E04B1/21 and E04B1/2403, e.g. connections between structural parts of different material
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Abstract
The invention discloses a novel connection construction method for a box-type steel column and a reinforced concrete beam, which is characterized in that the welding of the box-type steel column and a longitudinal stress steel bar reserved for the reinforced concrete beam is directly completed in a factory, the factory equipment is complete, the finished product processing is realized, the surrounding environment is controllable, the welding operation is facilitated, and the welding quality of a connection part can be effectively ensured; the construction process of welding and connecting the longitudinal beam ribs and the steel columns on site is reduced, and the installation of the box-type steel columns and the straight thread connection of the beams are directly carried out on site after the prefabrication in a factory is finished, so that the construction period is shortened, and the construction progress is accelerated; according to the invention, a large amount of welding construction is realized in a factory through the transfer of the construction environment, and under the large environment of intensive production of a steel member processing factory, the product quality is ensured, resources are saved, the environment is protected, and potential safety hazards such as fire hazards caused by field welding and firing operation are prevented.
Description
Technical Field
The invention relates to the technical field of steel structure construction, in particular to a novel connecting construction method for a box type steel column and a reinforced concrete beam.
Background
In the construction of a box-type steel column and reinforced concrete beam combined structure, a traditional construction process is that a connecting steel plate (steel corbel) is welded at the connecting position of the box-type steel column and the reinforced concrete beam, after the installation and construction of the steel column are finished, when the construction of the reinforced concrete beam is started, the longitudinal steel bar of the reinforced concrete beam is welded with the connecting steel plate (steel corbel) on the steel column at the construction site, the method adopts site welding, and due to the fact that the site construction environment is complex in working condition, more uncontrolled factors exist, the construction period of most projects is short, the welding operation requires too fast responsibility, the skill level and consciousness of a welder are not strong, welding leakage and welding loss can be caused, the welding quality of the connecting position of the steel bar of the beam and the box-type steel column is not easy to guarantee, the beam and the column are main stress and force transferring components of floors, and the connection quality is not good, so that unpredictable safety quality is easily caused.
Therefore, the novel connection construction method for the box-type steel column and the reinforced concrete beam, which is provided by adopting factory prefabrication welding at the joint of the beam longitudinal bar and the steel column, reduces field welding operation and ensures the welding quality of the joint, is a problem worthy of research.
Disclosure of Invention
The invention aims to provide a novel connection construction method for a box-type steel column and a reinforced concrete beam, which is characterized in that the joint of a beam longitudinal bar and a steel column is welded in a factory prefabrication mode, so that the field welding operation is reduced, and the welding quality of the joint is ensured.
The purpose of the invention is realized by the following steps:
a novel connection construction method for a box steel column and a reinforced concrete beam comprises the following steps: step 1: measuring and paying off and determining the installation position of the box-type steel column;
and 2, step: pouring an independent foundation;
and 3, step 3: processing and entering inspection of box type steel columns: welding and fixing a steel corbel on the box-type steel column, wherein a steel bar connecting surface corresponding to a concrete beam steel bar is arranged on the steel corbel, welding the reserved longitudinal stress steel bar of the concrete beam on the steel corbel in a factory workshop according to the layout space and the position of the longitudinal stress steel bar of the concrete beam, and machining a straight thread connecting screw thread at the other end of the longitudinal stress steel bar in advance;
and 4, step 4: hoisting the box type steel column on a construction site and mounting the box type steel column;
and 5: and (3) installing foundation beam reinforcing steel bars: connecting the longitudinal stressed steel bars on the installed box-type steel columns with the foundation beam steel bars through straight threaded sleeves, wherein joints are controlled according to primary joints;
step 6: installing a template;
and 7: and (5) checking and accepting to pour the concrete.
The specific operation of the step 1 is as follows: positioning and paying off by using a total station, arranging a positioning control pile in the straight line section of 20m, and arranging a height control line on the pile by using a level gauge; the central point of post is decided out with the total powerstation, emits the sideline of box steel column with the theodolite, and when actual conditions and drawing took place the conflict, agreed the back at the supervision engineer of sign, made the adjustment.
The specific operation of step 2 is as follows: after the measurement and the paying-off, digging to a supporting layer to pour a cushion layer, accurately, stably and straightly installing independent basic templates, enabling abutted seams of adjacent templates to be tight and smooth without slurry leakage, and uniformly coating a release agent before pouring; during pouring, continuously pouring layer by layer, adopting a vibrating rod to vibrate and compact, and then collecting slurry along a marking line and plastering; and (3) when concrete is poured, the embedded bolts are not loosened to ensure no deviation and no displacement, moisture preservation and maintenance are carried out within 7 days after the pouring is finished, and the template is dismantled after the foundation strength reaches the design form removal strength.
The specific operation of the step 4 is as follows: step 4.1, binding a crawling ladder on the column body of the box type steel column before installation, and facilitating the up-and-down movement of workers; step 4.2, calibrating an elevation reference point of the column body of the box-type steel column, measuring a difference value of the elevation reference point by using a level gauge, and adjusting the elevation and the vertical deviation of the steel column by using an adjusting nut under a column base bottom plate; and 4.3, after the hoisting of the box-type steel column and the corresponding steel beam is completed and the correction is completed, informing a civil engineering unit of performing secondary grouting on the foundation in time, and further stabilizing the box-type steel column.
In the step 5, firstly, stirrup separation lines are drawn on the main reinforcements at the four corners of the foundation beam, the main reinforcements at the four corners are threaded with stirrups, the joints are connected, the binding is firm according to the separation lines, and then other reinforcing steel bars are bound; when the longitudinal stressed steel bars of the beams are arranged in a double-layer or multi-layer mode, short steel bars with the same diameter are arranged between the longitudinal stressed steel bars of the two rows of beams, the length of a compression area and the distance between stirrups meet the design and specification requirements, and the first stirrup at the beam end is arranged 50mm away from the joint edge of the box-type steel column.
In the step 6, the template installation sequence is as follows: the method comprises the steps of bouncing a post position line and a section control line, clearing laitance, building a mounting frame, mounting a post hoop, mounting a template in place, checking diagonal lines, verticality and position, and checking and correcting.
Has the positive and beneficial effects that: the welding of the box-type steel column and the longitudinal stress steel bar of the reserved reinforced concrete beam is directly completed in a factory, the factory equipment is complete, the finished product processing is realized, the surrounding environment is controllable, the welding operation is facilitated, and the welding quality of the joint can be effectively ensured; the construction process of welding and connecting the longitudinal beam ribs and the steel columns on site is reduced, and the installation of the box-type steel columns and the straight thread connection of the beams are directly carried out on site after the prefabrication in a factory is finished, so that the construction period is shortened, and the construction progress is accelerated; according to the invention, a large amount of welding construction is realized in a factory through the transfer of construction environment, and under the large environment of intensive production of steel member processing factories, the product quality is ensured, resources are saved, the environment is protected, and potential safety hazards such as fire hazards caused by field welding and firing operation are prevented.
Drawings
FIG. 1 is a schematic diagram of a novel connection construction method for box-type steel columns and reinforced concrete beams according to the invention;
FIG. 2 is a view showing the adjustment of the elevation of the box-type steel column according to the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the drawings.
As shown in fig. 1, a novel connection construction method for a box steel column and a reinforced concrete beam comprises the following steps: step 1: measuring and paying off and determining the installation position of the box-type steel column; the specific operation is as follows: positioning and paying off by using a total station, arranging a positioning control pile in the straight line section of 20m, and arranging a height control line on the pile by using a level gauge; the central point of post is decided out with the total powerstation, emits the sideline of box steel column with the theodolite, and when actual conditions and drawing took place the conflict, agreed the back at the supervision engineer of sign, made the adjustment.
The positioning and lofting of the box-type steel column bolts are as follows: (1) performing on-site lofting on a positioning axis of a box-type steel column base positioning anchor bolt; (2) determining the accurate position of the positioning axis of each box-type steel column at the corresponding position of the concrete column at the position of the box-type steel column by using a total station, and marking on each concrete column surface; (3) and aligning a positioning axis on a positioning steel support of the foundation bolt with a positioning axis on the concrete column surface, and accurately positioning the foundation bolt. Determining the elevation and fixing the positioning steel bracket; (4) in the process of binding the steel bars, two measurers are assigned to frequently carry out measurement and check to ensure the accuracy of the position, and after the binding of the steel bars is finished, the measurement and check are carried out on the embedded bolts of each column base and the accurate positioning is carried out; (5) when the concrete is cast and tamped, two measurers should monitor the deviation condition on two mutually perpendicular axes by using the powder line, and correct adjustment in time.
And 2, step: pouring an independent foundation; the specific operation is as follows: after the measurement and the paying-off, digging to a supporting layer to pour a cushion layer, accurately, stably and straightly installing independent basic templates, enabling abutted seams of adjacent templates to be tight and smooth without slurry leakage, and uniformly coating a release agent before pouring; during pouring, continuously pouring layer by layer, adopting a vibrating rod to vibrate and compact, and then collecting slurry along a marking line and plastering; and (3) when concrete is poured, the embedded bolts are not loosened to ensure no deviation and no displacement, moisture preservation and maintenance are carried out within 7 days after the pouring is finished, and the template is dismantled after the foundation strength reaches the design form removal strength.
And 3, step 3: processing and inspecting the box-type steel column in the field: welding and fixing a steel corbel on the box-type steel column, wherein a steel bar connecting surface corresponding to a concrete beam steel bar is arranged on the steel corbel, welding the reserved longitudinal stress steel bar of the concrete beam on the steel corbel in a factory workshop according to the layout space and the position of the longitudinal stress steel bar of the concrete beam, and machining a straight thread connecting screw thread at the other end of the longitudinal stress steel bar in advance; the steel bars of the foundation beam are directly in direct threaded connection with the longitudinal stress steel bars reserved in advance of the box-type steel column when the steel bars of the foundation beam are constructed after being transported to a construction site, a series of problems caused by welding the longitudinal steel bars of the beam directly on the steel bracket on site are avoided, and quality hidden troubles caused by site welding are effectively solved. The field installation quality is improved, and the installation speed is accelerated.
And 4, step 4: hoisting the box type steel column on a construction site and mounting the box type steel column; the specific operation is as follows: step 4.1, binding a crawling ladder on the column body of the box type steel column before installation, and facilitating the up-and-down movement of workers; when the box-type steel column is hung 200mm above the in-place position, the machine is stopped stably, the box-type steel column slowly falls after aligning bolt holes and cross lines, anchor bolt screw threads are prevented from being collided during falling, the box-type steel column stops falling after being just contacted with a foundation, the alignment condition of the center lines of four sides of the box-type steel column and the cross axis of the foundation (four sides need to be considered) and the position and the quantity of a steel backing plate under the column are checked whether to be correct or not, if the alignment condition is not met, the adjustment is carried out immediately (three persons are needed during adjustment, one person moves the steel column, one person assists in stabilization, the other person carries out detection), after the in-place deviation of the box-type steel column is adjusted to be within 3mm, the box-type steel column is further fallen to be solid, cable ropes in four directions are tightened, anchor locking nuts are tightened, and ground anchors are pre-embedded before main structural steel bars are bound and concrete is poured according to the actual on-site condition, so that the wind ropes are conveniently fixed.
Step 4.2, calibrating an elevation reference point of the column body of the box-type steel column, measuring a difference value of the elevation reference point by using a level gauge, and adjusting the elevation and the vertical deviation of the steel column by using an adjusting nut under a column base bottom plate; or the height mark of the box steel column is adjusted by adding or subtracting the inclined gasket and the cushion block under the column base bottom plate. The contact between the base plate and the base surface and the bottom surface of the column should be smooth and tight. Before the concrete is poured for the second time, the base plates are welded and fixed. When the screw is affected by the length of the screw and the nut cannot be adjusted, the base plates can be arranged on the basis for leveling, namely the base plates are arranged at four corners of the box-type steel column and are tracked and leveled by a measurer, and the box-type steel column can be directly installed in place. Preferably, there are no more than 4 pads per set. The contact between the base plate and the base surface and the bottom surface of the column should be smooth and tight. As shown in fig. 2.
And 4.3, after the hoisting of the box-type steel column and the corresponding steel beam is completed and the correction is completed, informing a civil engineering unit to carry out secondary grouting on the foundation in time, further stabilizing the box-type steel column, and timely inserting the civil engineering unit when concrete is required to be poured into the box-type steel column. And (3) installing and welding the bottom layer box type steel column, pouring fine stone concrete after the inspection and acceptance are qualified, and pouring and stirring the fine stone concrete while grouting to prevent bubbles from being generated in grouting construction.
And 5: and (3) installing foundation beam reinforcing steel bars: connecting a longitudinal stressed steel bar on the installed box type steel column with a foundation beam steel bar through a straight thread sleeve, wherein a joint is controlled according to a primary joint; the construction sequence is as follows: main girder reinforcing steel → girder placing positioning hoop → girder stirrup → secondary girder main steel → placing secondary girder positioning hoop → secondary girder stirrup → concrete cushion block fixing; firstly, drawing stirrup separation lines on four-corner main reinforcements of a foundation beam, penetrating the four-corner main reinforcements with the stirrups, connecting joints, binding firmly according to the separation lines, and then binding other reinforcing steel bars; when the longitudinal stressed steel bars of the beams are arranged in a double-layer or multi-layer mode, short steel bars with the same diameter are arranged between the longitudinal stressed steel bars of the two rows of beams, the length of a compression area and the distance between stirrups meet the design and specification requirements, and the first stirrup at the beam end is arranged 50mm away from the joint edge of the box-type steel column.
Step 6: installing a template; the template installation sequence is as follows in sequence: the method comprises the steps of bouncing a post position line and a section control line, clearing floating slurry, building a mounting frame, mounting a post hoop, installing a template in place, checking diagonal lines, verticality and position, checking and correcting.
And 7: and (5) checking and accepting and pouring concrete.
By adopting the construction method, 30.37 yuan per square meter is saved, the direct construction cost is reduced, and the construction period of the project is shortened. The analysis was as follows:
TABLE 10.1-1 comparative analysis of conventional Process and New Process
Social benefits
By adopting the construction method, most of welding operation is carried out in steel structure factories, energy consumption is intensively treated, and the level of building energy conservation is further improved; the steel structure factory concentrates the processing and manufacturing operation, saves the land use area on site; the problem of large welding amount on a construction site is solved, and the emission of welding gas is reduced, so that the environment is protected; interference of human factors is reduced, labor is saved, and welding quality is guaranteed; the factory is integrated and centralized for production, so that the construction period is saved; the construction welding operation on site is reduced, so that the probability of fire occurrence is reduced; the technology is well received by supervision and construction units.
To sum up, the construction method shortens the construction period, pushes a new technology, ensures the construction welding quality, simplifies the field construction process, saves resources, protects the environment, and conforms to the green construction idea advocated by the state, thereby winning the customer satisfaction and improving the market competitiveness
Examples of the applications
The construction method is applied to the building selling part of the project of south lake and peninsula of the mountain and phoenix city of Tang mountain in Hebei river. Is located on the south side of the latitude one way and the west side of the Tang Cao way in the south-south area of Tang mountain city in Hebei province, and the site is originally a factory. The floor area is about 31673.93 square meters, the total building area is about 99286.75 square meters, wherein the floor is 63347.86 square meters, the underground is 35938.89 square meters. The project is started on the date 2021, 08-month and 01-day, and completed on the date 2022, 12-month and 31-day. In the construction stage of the building selling part, the construction process is adopted, so that the construction period is shortened, the connection quality of the box-type steel column and the foundation beam is ensured, and the expected effect is achieved.
Claims (6)
1. A novel connecting construction method for a box steel column and a reinforced concrete beam is characterized in that: the method comprises the following steps: step 1: measuring and paying off and determining the installation position of the box-type steel column;
and 2, step: pouring an independent foundation;
and step 3: processing and entering inspection of box type steel columns: welding and fixing a steel bracket on the box-type steel column, wherein a steel bar connecting surface corresponding to a concrete beam steel bar is arranged on the steel bracket, welding reserved longitudinal stress steel bars of the concrete beam on the steel bracket in a factory workshop according to the layout space and the position of the longitudinal stress steel bars of the concrete beam, and machining a straight thread connecting screw thread at the other end of the longitudinal stress steel bars in advance;
and 4, step 4: hoisting the box type steel column on a construction site and mounting the box type steel column;
and 5: and (3) installing foundation beam reinforcing steel bars: connecting the longitudinal stressed steel bars on the installed box-type steel columns with the foundation beam steel bars through straight threaded sleeves, wherein joints are controlled according to primary joints;
step 6: installing a template;
and 7: and (5) checking and accepting and pouring concrete.
2. The novel connecting construction method for the box-type steel column and the reinforced concrete beam as claimed in claim 1, is characterized in that: the specific operation of the step 1 is as follows: positioning and paying off by using a total station, arranging a positioning control pile in the straight line section of 20m, and arranging a height control line on the pile by using a level gauge; the central point of post is decided out with the total powerstation, emits the sideline of box steel column with the theodolite, and when actual conditions and drawing conflict, after proving that supervision engineer agrees, the adjustment is made.
3. The novel connecting construction method for the box-type steel column and the reinforced concrete beam according to claim 1, characterized in that: the specific operation of the step 2 is as follows: after the measurement and the paying-off, digging to a supporting layer to pour a cushion layer, accurately, stably and straightly installing independent basic templates, enabling abutted seams of adjacent templates to be tight and smooth without slurry leakage, and uniformly coating a release agent before pouring; during pouring, continuously pouring layer by layer, adopting a vibrating rod to vibrate and compact, and then collecting slurry along a marking line and plastering; and (3) when concrete is poured, the embedded bolts are not loosened to ensure no deviation and no displacement, moisture preservation and maintenance are carried out within 7 days after the pouring is finished, and the template is dismantled after the foundation strength reaches the design form removal strength.
4. The novel connecting construction method for the box-type steel column and the reinforced concrete beam as claimed in claim 1, is characterized in that: the specific operation of the step 4 is as follows: step 4.1, binding a crawling ladder on the column body of the box type steel column before installation, and facilitating the up-and-down movement of workers; step 4.2, calibrating an elevation reference point of the column body of the box-type steel column, measuring the difference value of the elevation reference point by using a leveling instrument, and adjusting the elevation and the vertical deviation of the steel column by using an adjusting nut under a column base bottom plate; and 4.3, after the hoisting of the box-type steel column and the corresponding steel beam is completed and the correction is completed, informing a civil engineering unit of performing secondary grouting on the foundation in time, and further stabilizing the box-type steel column.
5. The novel connecting construction method for the box-type steel column and the reinforced concrete beam according to claim 1, characterized in that: in the step 5, firstly, stirrup separation lines are drawn on the four-corner main reinforcements of the foundation beam, the four-corner main reinforcements are threaded with stirrups, the joints are connected, the binding is firm according to the separation lines, and then other reinforcements are bound; when the longitudinal stressed steel bars of the beams are arranged in a double-layer or multi-layer mode, short steel bars with the same diameter are arranged between the longitudinal stressed steel bars of the two rows of beams, the length of the encryption area and the distance between the stirrups meet the design and specification requirements, and the first stirrup at the beam end is arranged 50mm away from the edge of a box-type steel column node.
6. The novel connecting construction method for the box-type steel column and the reinforced concrete beam as claimed in claim 1, is characterized in that: in the step 6, the installation sequence of the templates is as follows: the method comprises the steps of bouncing a post position line and a section control line, clearing floating slurry, building a mounting frame, mounting a post hoop, installing a template in place, checking diagonal lines, verticality and position, checking and correcting.
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Cited By (1)
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CN118148300A (en) * | 2024-04-22 | 2024-06-07 | 中交一公局厦门工程有限公司 | Construction method of profile steel and steel bar connecting plate in frame column |
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Application publication date: 20221101 |