CN107780530B - Connecting structure of prefabricated assembled column and construction method thereof - Google Patents
Connecting structure of prefabricated assembled column and construction method thereof Download PDFInfo
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- CN107780530B CN107780530B CN201710994455.3A CN201710994455A CN107780530B CN 107780530 B CN107780530 B CN 107780530B CN 201710994455 A CN201710994455 A CN 201710994455A CN 107780530 B CN107780530 B CN 107780530B
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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
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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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
- E04B1/19—Three-dimensional framework structures
- E04B2001/1993—Details of framework supporting structure, e.g. posts or walls
Abstract
The invention discloses a connecting structure of an assembly type precast column and a construction method thereof, relates to an assembly type concrete structure, and aims to provide a connecting structure of an assembly type precast column, which has the advantage of increasing the connecting strength between the precast column and a precast base layer, and the technical scheme is as follows: including setting up the prefabricated post on prefabricated basic unit, the position that prefabricated basic unit and prefabricated post are connected is equipped with a plurality of reinforcing bars that stretch out prefabricated basic unit, the reinforcing bar runs through prefabricated basic unit, set up on the prefabricated post and supply reinforcing bar male prefabricated hole, the position that prefabricated post outer wall and prefabricated basic unit are connected is equipped with a soil layer, prefabricated post lower extreme is equipped with the grout hole and a plurality of grout outlet that extend to prefabricated hole lower extreme with prefabricated hole intercommunication, the grout hole is located grout outlet upper end and grout outlet is located the layer upper end of covering, be equipped with the rubber buffer that seals grout outlet and grout outlet on the prefabricated post.
Description
Technical Field
The invention relates to an assembly type concrete structure, in particular to a connecting structure of an assembly type precast column and a construction method thereof.
Background
The conventional method of the fabricated frame structure is that the beam and the column are prefabricated, the node is cast in situ, and the fabricated frame structure is characterized in that reinforcing steel bars of the beam and the column in all directions are inserted, crossed and connected and anchored in a node core area, the node construction difficulty is high, the structural integrity is good, and the same cast-in-situ structure can be achieved. The vertical steel bars of the upper and lower columns are butted by sleeves or lapped by a preformed hole steel bar grout anchor, but the main problem is that the lowermost column is connected with concrete and needs stronger connection to support the column and the beam at the upper end.
Disclosure of Invention
The invention aims to provide a connecting structure of an assembly type prefabricated column, which has the advantage of increasing the connecting strength between the prefabricated column and a prefabricated base layer.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a connection structure of prefabricated post of assembled, is including setting up the prefabricated post on prefabricated basic unit, the position that prefabricated basic unit and prefabricated post are connected is equipped with a plurality of reinforcing bars that stretch out prefabricated basic unit, the reinforcing bar runs through prefabricated basic unit, set up on the prefabricated post and supply reinforcing bar male prefabricated hole, the position that prefabricated post outer wall is connected with prefabricated basic unit is equipped with a soil layer, prefabricated post lower extreme is equipped with the slip casting hole and a plurality of grout outlet that extend to prefabricated hole lower extreme with prefabricated hole intercommunication, the slip casting hole is located grout outlet upper end and grout outlet is located the loam cake layer upper end, be equipped with the rubber buffer that seals slip casting hole and grout outlet on the prefabricated post.
Through adopting above-mentioned technical scheme, when prefabricated post is connected with prefabricated basic unit, earlier through steel bar connection, pour concrete toward prefabricated downthehole through the slip casting hole afterwards, each prefabricated hole is tamped, unnecessary concrete is discharged through the grout outlet, show this moment that the concrete in each prefabricated hole has been filled up, the connection of prefabricated post and prefabricated basic unit has been strengthened on the one hand to the banking up layer, on the other hand reduces the concrete and discharges from prefabricated post and prefabricated basic unit hookup location, when the grout outlet, the rubber buffer will play the grout outlet and block up, treat after the concrete solidification with the reinforcing bar fastening in prefabricated downthehole, the connection of prefabricated post and prefabricated basic unit has been strengthened.
The invention is further configured to: the fixed slot that the direction was sunken is kept away from prefabricated basic unit direction is seted up to the one end that prefabricated post contradicted with prefabricated basic unit.
Through adopting above-mentioned technical scheme, after concrete gets into prefabricated downthehole, flow in the fixed slot, the concrete that is located the fixed slot this moment solidifies the back, and one end is connected with prefabricated basic unit, and the other end is connected with prefabricated post, has further strengthened being connected of prefabricated post and prefabricated basic unit.
The invention is further configured to: be equipped with the fixed slot all be equipped with spacing groove one in the both sides of fixed slot notch on the side of prefabricated post, be equipped with the spacing groove two that corresponds with spacing groove one on the prefabricated basic unit.
Through adopting above-mentioned technical scheme, in the gap entering spacing groove one and spacing groove two between concrete through prefabricated post and the prefabricated basic unit, the concrete solidifies in spacing groove one and spacing groove two, and then has increased the area of being connected of prefabricated post and prefabricated basic unit.
The invention is further configured to: the prefabricated post is kept away from and is equipped with a plurality of snap rings that are used for lifting by crane prefabricated post with the side of conflicting of prefabricated basic unit, the recess that supplies the snap ring embedding is seted up to prefabricated post upper end, the standing groove has been seted up on prefabricated post along length direction's the side, the tank bottom of standing groove is equipped with the screw thread post, screw thread post external screw thread connection has rings.
Through adopting above-mentioned technical scheme, when the suitable position of prefabricated post to prefabricated basic unit is removed to needs, through rings with prefabricated post horizontal migration to required position, turn over the prefabricated post to vertical position through the snap ring afterwards and be connected with prefabricated basic unit.
The invention is further configured to: the prefabricated base layer is provided with a plurality of gaskets on the surface abutting against the prefabricated column.
Through adopting above-mentioned technical scheme, the gasket is used for adjusting the vertical degree of prefabricated post when prefabricated post contradicts with prefabricated basic unit, and the gasket leaves prefabricated post and prefabricated basic unit frame, and the concrete of being convenient for gets into between prefabricated post and the prefabricated basic unit, strengthens prefabricated post and prefabricated basic unit's connection.
The invention is further configured to: all run through in prefabricated basic unit and the prefabricated post and have the earth connection, set up the spread groove that supplies the earth connection to stretch out on the prefabricated post, the earth connection in prefabricated basic unit and the prefabricated post passes through welded connection.
By adopting the technical scheme, unsafe charges or leakage currents generated by various reasons are led out of the circuit by the grounding wire, so that the safety is improved, and the grounding wire can conveniently extend out of the prefabricated column and is connected with the grounding wire on the adjacent prefabricated base layer by the connecting groove.
Another object of the present invention is to provide a construction method of a precast column,
the method comprises the following steps: paying off: controlling a pile on a prefabricated base layer according to an arranged axis, carrying out control axis projection measurement on the prefabricated base layer by using a vertical collimator and a theodolite, sequentially emitting longitudinal and transverse axes of the prefabricated base layer according to the control axis, emitting a detailed position line of a prefabricated column of the prefabricated base layer and a control line of the prefabricated column according to the control axis of the prefabricated base layer, and marking a number on the detailed position line of the prefabricated column;
step two: and (3) correcting the steel bars: checking whether the position of a reserved steel bar is accurate or not by using a steel bar positioning frame according to the prefabricated column positioning line, and adjusting deviation in time;
step three: leveling by using gaskets: a gap of 20mm is designed between the lower opening of the prefabricated column and the prefabricated base layer and is used for grouting, two points of plastic or iron gaskets with the total length size of 1/4 of the component are taken in a component frame line and leveled before the prefabricated column is hoisted, the overall thickness is 2cm, the thickness of the gaskets is divided into 2 mm, 3mm, 5mm, 10mm and 20mm, and the leveling height of the prefabricated column is adjusted according to the quantity of different gaskets;
step four: plugging a grouting joint: a 20cm gap between the lower opening of the prefabricated column and the floor slab is plugged by dry and hard setting slurry, or a 30x30 triangular toe plug gap is formed by applying dry and hard cement mortar to the 20cm gap of the wall root;
step five: and (3) mounting the prefabricated column: before installation, the base joint bars are corrected in sequence according to a drawing, and meanwhile, the garbage of the base is cleaned; hoisting is carried out slowly through the hoisting ring, and the prefabricated column is lifted at a constant speed after being completely separated from the support; when the prefabricated columns are positioned on the prefabricated base layer, the exposed steel bars of the prefabricated columns need to be manually straightened and are inserted into the prefabricated holes in a one-to-one corresponding mode;
step six: installing an inclined support: the method comprises the following steps of (1) carrying out vertical leveling detection and correction on a prefabricated column by adjusting an inclined support until the prefabricated column reaches a design requirement range, and then fixing;
step seven: grouting through grouting holes;
step eight: dismantling the inclined strut: the diagonal bracing needs to be removed when the concrete is poured and reaches a certain strength.
Through adopting above-mentioned technical scheme, with the accurate fixing in prefabricated basic unit upper end of prefabricated post, reinforcing bar alignment and gasket are made level and are convenient for the prefabricated post vertical install on prefabricated basic unit, and the downthehole slip casting of slip casting in the step seven is convenient for in the shutoff of grout joint, and diagonal bracing is convenient for when the prefabricated post is not firm to be fixed on prefabricated basic unit, keeps with the position of prefabricated basic unit.
The invention is further configured to: step seven: the concrete construction method for grouting through the grouting holes comprises the following steps:
A. cleaning grout holes, and checking whether the grout holes and grout outlet holes of each joint have sundries which influence the flow of grout or not one by one before formal grouting to ensure that the hole paths are smooth;
B. grouting by a specially-assigned person, namely grouting by a professional grouting team, and grouting from a grouting hole below the joint to the pressure in the prefabricated hole by a grouting pump or a grouting gun;
C. flushing equipment, namely flushing the grouting machine by using clear water before grouting construction to ensure that the grouting machine is normally used;
D. controlling pressure, wherein the pressure is controlled to be 0.2-0.4Mpa in the grouting process, and the actual grouting effect is as follows: the grouting material overflows from the grout outlet, namely the pressure of the grouting material discharged from the gun head of the grouting machine is controlled to be 0.2 Mpa;
E. grouting and plugging, namely sequentially plugging grouting and discharging holes according to the discharging of slurry, and stopping grouting after a grouting pump or a grouting gun keeps grouting pressure during plugging until all grouting and discharging holes are discharged and plugged firmly; if slurry leaks, the lost slurry is immediately replenished.
By adopting the technical scheme, the grouting hole cleaning and the equipment flushing are both prepared for smooth grouting, the pressure is controlled in the grouting process, and the phenomenon that the plugging of the soil sealing layer is broken once the pressure is too high is avoided.
In conclusion, the invention has the following beneficial effects: insert in the prefabricated post through the reinforcing bar and pour into the precast hole concrete through the slip casting hole in with the stable fixing of reinforcing bar in the prefabricated post, accomplish prefabricated post and prefabricated basic unit's being connected, and the concrete links together prefabricated post and prefabricated basic unit this moment, has strengthened the connection of prefabricated post and prefabricated basic unit.
Drawings
FIG. 1 is a schematic structural view of the present embodiment;
FIG. 2 is a partially enlarged schematic view of a portion A of FIG. 1;
FIG. 3 is a schematic structural diagram of a grouting hole and a grout outlet according to the present embodiment;
FIG. 4 is a schematic structural view of a second limiting groove of the present embodiment;
FIG. 5 is a schematic structural diagram of a fixing groove of the present embodiment;
FIG. 6 is a flowchart for embodying the construction method of the precast column of the present embodiment;
fig. 7 is a construction flowchart for embodying grouting of a grouting hole according to the present embodiment.
In the figure, 1, a base layer is prefabricated; 11. reinforcing steel bars; 12. a second limiting groove; 13. a gasket; 2. prefabricating a column; 21. prefabricating holes; 22. sealing a soil layer; 23. grouting holes; 24. a slurry outlet; 25. a rubber plug; 26. fixing grooves; 27. a first limiting groove; 28. a snap ring; 281. a groove; 29. a placement groove; 291. a threaded post; 292. lifting a lifting ring; 293. a ground line; 2931. and connecting the grooves.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Examples
A connecting structure of prefabricated columns of an assembly type is disclosed, as shown in figure 1, and comprises a plurality of prefabricated columns 2 which are arranged on a prefabricated base layer 1 and are vertical to the prefabricated base layer 1, wherein a plurality of steel bars 11 extending out of the prefabricated base layer 1 are arranged at the connecting position of the prefabricated base layer 1 and the prefabricated columns 2, the steel bars 11 penetrate through the prefabricated base layer 1 (as shown in figure 4), prefabricated holes 21 (as shown in figure 5) for inserting the steel bars 11 are formed in the prefabricated columns 2, the connection of the steel bars 11 and the prefabricated columns 2 is facilitated, as shown in figure 3, the outer wall of the lower end of each prefabricated column 2 is provided with a grouting hole 23 communicated with the corresponding prefabricated hole 21 and a plurality of grout outlet holes 24 extending from the bottom of the corresponding prefabricated column 2 to the lower end of the corresponding prefabricated hole 21, the grouting holes 23 are formed in the upper ends of the grout outlet holes 24, a soil sealing layer 22 is arranged at the connecting position of the outer wall of the corresponding prefabricated column 2 and the prefabricated base layer 1, the grout outlet holes 24 are formed, when concrete enters the position where the precast column 2 is abutted to the precast base layer 1, the concrete sealing layer 22 limits the outflow of the concrete, the concrete gradually flows out of the grout outlet 24 along with the injection of the concrete, and when the concrete flows out of the grout outlet 24, the precast column 2 is provided with a rubber plug 25 for sealing the grout outlet 23 and the grout outlet 24; after the concrete is solidified, the concrete fixes the prefabricated column 2 on the prefabricated base layer 1, and fixes the reinforcing steel bar 11 of the prefabricated base layer 1 in the prefabricated column 2, so that the connection between the prefabricated column 2 and the prefabricated base layer 1 is enhanced.
As shown in fig. 1, the same reinforcing bars 11 as those in the prefabricated base layer 1 are also inserted above the prefabricated holes 21 of the prefabricated columns 2, so that another prefabricated column 2 can be inserted above the prefabricated column 2, and the connection of the adjacent prefabricated columns 2 in the vertical direction can be realized.
As shown in fig. 4 and 5, in order to further enhance the connection between the prefabricated column 2 and the prefabricated base layer 1, a fixing groove 26 recessed towards the direction away from the prefabricated base layer 1 is formed in one end of the prefabricated column 2 abutting against the prefabricated base layer 1, and first limiting grooves 27 are formed in the two sides of the notch of the fixing groove 26 on the side surface of the prefabricated column 2 provided with the fixing groove 26, the first limiting grooves 27 are arranged along the length direction of the fixing groove 26, second limiting grooves 12 corresponding to the first limiting grooves 27 are formed in the prefabricated base layer 1, at this time, concrete flowing between the prefabricated column 2 and the prefabricated base layer 1 through the grouting hole 23 and the prefabricated hole 21 enters the fixing groove 26, the first limiting grooves 27 and the second limiting grooves 12, after the concrete is solidified, one end of the concrete is connected with the prefabricated base layer 1, the other end of the concrete is connected with the prefabricated column 2, and the connection between the prefabricated column 2 and.
As shown in fig. 1 and 5, when the precast column 2 is placed at the upper end of the precast base layer 1, a plurality of placing grooves 29 are formed on the side surface of the precast column 2 along the length direction, a threaded column 291 is arranged at the bottom of the placing groove 29, the threaded column 291 is externally threaded and connected with a lifting ring 292, so that the precast column 2 can be lifted to a desired position, when the lifting ring 292 is not used, the lifting ring 292 is detached from the threaded column 291, as shown in fig. 1 and 2, then, two snap rings 28 for lifting the precast column 2 are arranged on the side surface of the precast column 2 far away from the side surface abutting against the precast base layer 1, a groove 281 for embedding the snap rings 28 is formed at the upper end of the precast column 2, so that the snap rings 28 are prevented from extending out of the outer wall of the precast column 2, the appearance of the precast column 2 is prevented from being influenced, a human body is prevented from colliding against the snap rings 28 during the lifting of the precast column 2, the safety is increased, it is convenient to pull the horizontal precast columns 2 to the vertical position, the groove 281 is upward at this time, and when the precast columns 2 are placed again at the upper ends of the precast columns 2 at this time, the groove 281 increases the inflow area of concrete, increasing the connection of the adjacent precast columns 2.
As shown in fig. 4, when the prefabricated column 2 is placed on the prefabricated base layer 1, in order to adjust the verticality of the prefabricated column 2, a plurality of spacers 13 are provided on the surface of the prefabricated base layer 1, which is abutted against the prefabricated column 2; in addition, the grounding wires 293 penetrate through the prefabricated base layer 1 and the prefabricated column 2, unsafe current is conducted to the ground through the grounding wires 293, safety is improved, the prefabricated column 2 is provided with connecting grooves 2931 for the grounding wires 293 to extend out, and the prefabricated base layer 1 and the grounding wires 293 in the prefabricated column 2 are connected through welding.
A construction method of a prefabricated column, as shown in fig. 6, comprising:
the method comprises the following steps: paying off, controlling the pile on the prefabricated base layer according to the arranged axis, carrying out control axis projection measurement on the prefabricated base layer by using a vertical collimator and a theodolite, sequentially emitting longitudinal and transverse axes of the prefabricated base layer according to the control axis, emitting a detailed position line of a prefabricated column of the prefabricated base layer and a control line of the prefabricated column according to the control axis of the prefabricated base layer, and marking a number on the detailed position line of the prefabricated column;
step two: correcting the steel bars, namely checking whether the positions of the reserved steel bars are accurate or not by using a steel bar positioning frame according to the prefabricated column positioning lines, and adjusting deviation in time;
step three: leveling gaskets, wherein a gap of 20mm is designed between the lower opening of the prefabricated column and a prefabricated base layer and is used for grouting, two points of plastic or iron gaskets with the total length of 1/4 of the component are taken in a component frame line and leveled before the prefabricated column is hoisted, the overall thickness of the gasket is 2cm, the thickness of the gasket is divided into 2 mm, 3mm, 5mm, 10mm and 20mm, and the leveling height of the prefabricated column is adjusted according to the quantity of different gaskets;
step four: plugging a grouting joint, namely plugging a 20cm seam between the lower opening of the prefabricated column and a floor slab by adopting dry and hard setting slurry, or smearing 30x30 triangular slope toe plug seams at the 20cm seam of the wall root by adopting dry and hard cement mortar;
step five: and (3) mounting the prefabricated column: before installation, the base joint bars are corrected in sequence according to a drawing, and meanwhile, the garbage of the base is cleaned; the hoisting is carried out slowly through the hoisting ring, and the prefabricated column can be lifted at a constant speed after being completely separated from the bracket; when the prefabricated columns are positioned on the prefabricated base layer, the exposed steel bars of the prefabricated columns need to be manually straightened and are inserted into the prefabricated holes in a one-to-one corresponding mode;
step six: installing an inclined support: in order to prevent the prefabricated column from inclining and the like, after the prefabricated column is in place, fixing an adjustable inclined support on the prefabricated column and a prefabricated base layer by using an embedded bolt and an M10-75 cement countersunk head self-tapping screw in time, carrying out vertical leveling detection and correction on each surface of the prefabricated column by adjusting the inclined support, carrying out vertical leveling detection and correction on the prefabricated column by adjusting the inclined support until the prefabricated column reaches the range of the design requirement, and then fixing;
step seven: grouting through grouting holes; as shown in fig. 7, the concrete construction method includes,
A. cleaning grout holes, and checking whether the grout holes and grout outlet holes of each joint have sundries which influence the flow of grout or not one by one before formal grouting to ensure that the hole paths are smooth;
B. special person grouting, grouting by a professional grouting team, grouting from a grouting hole below a joint to the pressure in a prefabricated hole by a grouting pump or a grouting gun, particularly, completely grouting normal grouting slurry within 20-30 minutes from the beginning of water adding and stirring to reserve certain operation emergency time as much as possible, noting that ① the same bin can only grout in one grouting hole and cannot simultaneously select more than two holes for grouting, ② the same bin needs to continuously grout without intermediate pause, if the intermediate pause is realized, grouting again needs to ensure that the grouted slurry has enough fluidity, then the blocked grout outlet holes need to be opened, and the grout outlet holes are blocked one by one after the grouting slurry flows out again;
C. flushing equipment, namely flushing the grouting machine by using clear water before grouting construction to ensure that the grouting machine is normally used;
D. controlling pressure, wherein the pressure is controlled to be 0.2-0.4Mpa in the grouting process, and the actual grouting effect is as follows: the grouting material overflows from the grout outlet, namely the pressure of the grouting material discharged from the gun head of the grouting machine is controlled to be 0.2 Mpa; once the pressure is too high, the plugging of the soil sealing layer is broken;
E. grouting and plugging, namely sequentially plugging grouting and discharging holes according to the discharging of slurry, and stopping grouting after a grouting pump or a grouting gun keeps grouting pressure during plugging until all grouting and discharging holes are discharged and plugged firmly; if slurry leaks, the lost slurry is immediately replenished.
Grouting material configuration and transportation mode: and selecting the construction time, namely selecting the temperature rise time period in the morning as far as possible, starting construction when the temperature in the prefabricated hole in the proper prefabricated column is detected to be above 0 ℃, and ensuring that the environmental temperature cannot be reduced to below 0 ℃ within 4 hours after grouting. The construction is carried out at the ambient temperature of 0-10 ℃, the mixing water is natural normal temperature water (not less than 10 ℃), and the prefabricated column does not need to be subjected to heat preservation and heating measures. When the environment temperature is between-10 and 0 ℃, the temperature of the powder is not lower than 5 ℃ when the environment temperature is ensured, the powder is properly heated when being mixed, the stirring time is properly prolonged, and the temperature of the slurry before being injected into the prefabricated hole is not lower than 10 ℃ and is not higher than 25 ℃. When the ambient temperature is above 10 ℃, the conventional grouting material can be adopted. And (3) preparing slurry, namely firstly adding all mixing water strictly according to the water-material ratio, then uniformly adding 70% of grouting material dry material, stirring for about 1-2min, then adding the rest grouting dry material, and stirring for 2-3min to be uniform. Under a low-temperature environment, the viscosity of the slurry is increased, the fluidity is reduced, the stirring time can be properly prolonged, but the total stirring time is not longer than 6min, and the field control is 4-5 min.
And (3) grouting material maintenance: the temperature of the grouting material at the beginning of curing is not lower than 5 ℃. If the temperature is lower than 0 ℃ within 4 hours after grouting, certain heat preservation or heating and heat preservation measures are required according to specific environmental conditions. If the air temperature is lower than 0 ℃, grouting construction is not required as much as possible, if grouting is necessary, preheating measures are taken for grouting parts, and heating and heat preservation are carried out for not less than 4 hours after grouting, so that the temperature in the sleeve is ensured to be not lower than 0 ℃ at the stage. And after grouting is finished, covering, preserving heat and maintaining within 30cm of the bottom of the prefabricated column by using geotextile or felt.
Step eight: dismantling the inclined strut: the diagonal brace can be detached after the concrete is poured and reaches a certain strength.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (1)
1. A construction method of a prefabricated column is characterized in that:
the method comprises the following steps: paying off: controlling a pile on a prefabricated base layer according to an arranged axis, carrying out control axis projection measurement on the prefabricated base layer by using a vertical collimator and a theodolite, sequentially emitting longitudinal and transverse axes of the prefabricated base layer according to the control axis, emitting a detailed position line of a prefabricated column of the prefabricated base layer and a control line of the prefabricated column according to the control axis of the prefabricated base layer, and marking a number on the detailed position line of the prefabricated column;
step two: and (3) correcting the steel bars: checking whether the position of a reserved steel bar is accurate or not by using a steel bar positioning frame according to the prefabricated column positioning line, and adjusting deviation in time;
step three: leveling by using gaskets: a gap of 20mm is designed between the lower opening of the prefabricated column and the prefabricated base layer and is used for grouting, two points of plastic or iron gaskets with the total length size of 1/4 of the component are taken in a component frame line and leveled before the prefabricated column is hoisted, the overall thickness is 2cm, the thickness of the gaskets is divided into 2 mm, 3mm, 5mm, 10mm and 20mm, and the leveling height of the prefabricated column is adjusted according to the quantity of different gaskets;
step four: plugging a grouting joint: a 20cm gap between the lower opening of the prefabricated column and the floor slab is plugged by dry and hard setting slurry, or a 30x30 triangular toe plug gap is formed by applying dry and hard cement mortar to the 20cm gap of the wall root;
step five: and (3) mounting the prefabricated column: before installation, the base joint bars are corrected in sequence according to a drawing, and meanwhile, the garbage of the base is cleaned; hoisting is carried out slowly through the hoisting ring, and the prefabricated column is lifted at a constant speed after being completely separated from the support; when the prefabricated columns are positioned on the prefabricated base layer, the exposed steel bars of the prefabricated columns need to be manually straightened and are inserted into the prefabricated holes in a one-to-one corresponding mode;
step six: installing an inclined support: the method comprises the following steps of (1) carrying out vertical leveling detection and correction on a prefabricated column by adjusting an inclined support until the prefabricated column reaches a design requirement range, and then fixing;
step seven: grouting through a grouting hole, wherein the concrete construction method comprises the following steps:
A. cleaning grout holes, and checking whether the grout holes and grout outlet holes of each joint have sundries which influence the flow of grout or not one by one before formal grouting to ensure that the hole paths are smooth;
A1. and (3) grouting material preparation: detecting that the temperature in a prefabricated hole in a proper prefabricated column is above 0 ℃, and starting construction, and ensuring that the environmental temperature is not reduced to below 0 ℃ within 4 hours after grouting is finished; the construction is carried out at the ambient temperature of 0-10 ℃, the mixing water is natural normal temperature water, and the prefabricated column does not need to adopt heat preservation and heating measures; when the environmental temperature is between-10 and 0 ℃, the temperature of the powder is not lower than 5 ℃ when the environment temperature is ensured, the powder is properly heated when being mixed, the stirring time is properly prolonged, and the temperature of the slurry before being injected into the prefabricated hole is not lower than 10 ℃ and is not higher than 25 ℃; when the ambient temperature is above 10 ℃, the conventional grouting material is adopted;
A2. preparation of slurry: adding all mixing water according to the water-material ratio, uniformly adding 70% of grouting material dry material, stirring for 1-2min, then adding the rest grouting dry material, stirring for 2-3min to be uniform, wherein the viscosity of the slurry is increased and the fluidity is reduced in a low-temperature environment, the stirring time is properly prolonged, the total stirring time is less than 6min, and the field control is carried out for 4-5 min;
B. grouting by a specially-assigned person, namely grouting by a professional grouting team, and grouting from a grouting hole below the joint to the pressure in the prefabricated hole by a grouting pump or a grouting gun;
C. flushing equipment, namely flushing the grouting machine by using clear water before grouting construction to ensure that the grouting machine is normally used;
D. controlling pressure, wherein the pressure is controlled to be 0.2-0.4Mpa in the grouting process, and the actual grouting effect is as follows: the grouting material overflows from the grout outlet, namely the pressure of the grouting material discharged from the gun head of the grouting machine is controlled to be 0.2 Mpa;
E. grouting and plugging, namely sequentially plugging grouting and discharging holes according to the discharging of slurry, and stopping grouting after a grouting pump or a grouting gun keeps grouting pressure during plugging until all grouting and discharging holes are discharged and plugged firmly; if slurry leaks, the lost slurry is immediately replenished;
step eight: dismantling the inclined strut: the diagonal bracing needs to be removed when the concrete is poured and reaches a certain strength.
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| CN111764506B (en) * | 2020-07-18 | 2021-11-05 | 青海平兴建设集团有限公司 | Prefabricated assembly type concrete frame and assembling method |
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