CN114134928B - Construction method of steel pipe column tower crane foundation - Google Patents
Construction method of steel pipe column tower crane foundation Download PDFInfo
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- CN114134928B CN114134928B CN202111627741.9A CN202111627741A CN114134928B CN 114134928 B CN114134928 B CN 114134928B CN 202111627741 A CN202111627741 A CN 202111627741A CN 114134928 B CN114134928 B CN 114134928B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a construction method of a steel pipe column tower crane foundation, which comprises the following construction steps: s1, constructing a tower crane pile foundation; s2, embedding a steel pipe column of the tower crane in the construction process of the pile foundation of the tower crane; s3, constructing a bearing platform foundation on the tower crane steel pipe column; s4, installing a tower crane on the basis of the bearing platform; s5, excavating a foundation pit in the working range of the tower crane; s6, reinforcing the steel pipe column of the tower crane. The bottom surface of the tower crane foundation is arranged above the top plate structure of the underground garage, so that the tower crane is installed and constructed in parallel with the foundation pit, the construction, installation and acceptance cycles of the tower crane foundation are reduced, the tower crane can be put into use before the construction of the main body structure, and the production efficiency is improved; the bottom of the tower crane foundation is positioned above the top plate of the underground garage, and the tower crane part, the bottom plate and the top plate of the underground garage can be poured at one time, so that the need of constructing the bottom plate and the top plate of the tower body part again due to the fact that the tower body passes through the bottom plate and the top plate of the underground garage in the traditional scheme is reduced, the construction procedures are reduced, and the construction period is shortened.
Description
Technical Field
The patent application relates to the technical field of tower crane construction, in particular to a construction method of a steel pipe column tower crane foundation.
Background
For some comprehensive passenger transportation hub projects, underground garages are needed to be constructed below the ground, the garages generally occupy large areas, materials are transported completely by means of tower cranes, and transportation tasks are difficult. The traditional tower crane construction sequence is that the tower crane foundation and the tower crane are installed and constructed after the foundation pit is excavated, so that the next working procedure can not be immediately carried out after the foundation pit is excavated. The tower crane foundation construction, tower crane installation and acceptance period are longer, the normal investment and use time of the tower crane is lagged compared with the construction production requirement, and the construction production progress and the node construction period are extremely unfavorable.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present application is to provide a construction method for a steel pipe column tower crane foundation, which shortens the construction period of the tower crane, avoids adverse effects on the overall construction progress caused by the construction of the tower crane foundation, the installation and acceptance time of the tower crane, improves the construction production efficiency, and completes the node objective on schedule.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the construction method of the steel pipe column tower crane foundation comprises the following construction steps:
s1, constructing a tower crane pile foundation;
s2, embedding a steel pipe column of the tower crane in the construction process of the pile foundation of the tower crane;
s3, constructing a bearing platform foundation on the tower crane steel pipe column;
s4, installing a tower crane on the basis of the bearing platform;
s5, excavating a foundation pit in the working range of the tower crane;
s6, reinforcing the steel pipe column of the tower crane.
Further, in the step S1, the tower crane pile foundation is a bored pile, and the construction method of the bored pile comprises the following steps:
s11, construction lofting: determining the layout position of the bored pile according to the construction drawing, leveling the field of the position of the bored pile, and accurately lofting the position of the bored pile by adopting a total station;
s12, embedding a protective barrel: burying a pile casing at the lofting position, and measuring the elevation of the top of the pile casing after the pile casing is buried so as to control the elevation of the pile bottom of the bored pile;
s13, drilling and pore forming: installing a drilling machine after the pile casing is buried, working the drilling machine, detecting the alignment state of drilling mud and the drilling machine at any time in the drilling process, correcting in time when the alignment state is not in accordance with the requirements, and checking the hole after the drilling depth reaches the design requirements;
s14, hole cleaning: the drilling depth meets the design requirement, then the hole is cleaned, the hole is cleaned by adopting a slurry-changing method for construction, and the slurry-changing method comprises the following operation methods: lifting the drill bit by 20-30cm, rotating at a low speed, and then injecting the slurry with smaller relative density and viscosity to replace the slurry containing slag in the hole;
s15, placing a reinforcement cage: after the hole cleaning is finished, the steel bar cage is put into the hole in time, the top end of the steel bar cage is positioned after the steel bar cage is put into the hole, and the steel pipe column of the tower crane is embedded while the steel bar cage is placed;
s16, installing and pouring concrete into the guide pipe: after step S15 is completed, a pouring conduit is installed, and underwater concrete pouring is performed.
Further, in the step S12, the pile casing is made of a steel plate with the thickness of 10-15mm, the inner diameter of the pile casing is 1.0-1.2m, the top surface of the pile casing is 0.5-0.6m higher than the construction ground after being embedded, the center of the top surface of the pile casing is overlapped with the center line of the pile, the plane error is controlled within 50mm, and the gradient is controlled within 1%.
Further, the checking of the drilling in step S13 includes using a hole finder to detect the hole diameter, the hole depth and the hole inclination, so as to ensure that the hole diameter is not smaller than the designed hole diameter, the hole depth is not smaller than the designed hole depth and the hole inclination is not larger than 1%.
Further, in the step S16, after the grouting pipe is installed, the thickness of the sediment at the bottom of the hole needs to be detected again, if the thickness of the sediment exceeds the design requirement, the second hole cleaning is performed until the sediment is qualified, when the concrete is poured, the first concrete ensures that the depth of the embedded pipe is not less than 1m and not more than 3m, the depth of the embedded pipe is controlled to be 2-6m in the pouring process, the minimum depth of the embedded pipe is not less than 1m, and when the concrete is poured to be 1m from the bottom end of the steel pipe column of the tower crane, the pouring speed needs to be reduced so as to avoid the phenomena of floating cages, floating pipes and the like.
Further, in the step S2, the embedding of the steel pipe column of the tower crane is performed synchronously with the placement of the reinforcement cage, and the construction method of the steel pipe column of the tower crane and the reinforcement cage comprises the following steps: a. manufacturing a reinforcement cage: the steel reinforcement cages are inner and outer groups of steel reinforcement cages which are concentrically sleeved, the outer diameter of the outer steel reinforcement cage is larger than the outer diameter of the steel pipe column of the tower crane, and the outer diameter of the inner steel reinforcement cage is smaller than the outer diameter of the steel pipe column of the tower crane; b. hanging and placing a reinforcement cage: firstly, hoisting an outer reinforcement cage into a pile hole, continuously lowering an inner reinforcement cage without taking out a lifting hook of the outer reinforcement cage, and welding the bottoms of the two reinforcement cages into a whole by adopting a plurality of Z-shaped reinforcement bars when the tops of the two reinforcement cages are flush, so that the inner reinforcement cage is exactly positioned in the center of the outer reinforcement cage, and then taking out the lifting hook of the inner reinforcement cage and the reinforcement cage below; c. placing a steel pipe column of the tower crane: two lifting rings which are symmetrically arranged are welded on the side edge of the tower crane steel pipe column 3-3.5m away from the bottom, two section steel is penetrated on the lifting rings and erected on a sleeper on the pile casing, so that an inner reinforcement cage extends into the tower crane steel pipe column for 3-3.5m; d. fixing a steel pipe column of the tower crane: and (3) adjusting the center position of the pile of the steel pipe column of the tower crane, welding the outer side of the steel pipe column of the tower crane and the inner side of the main reinforcement at the top of the outer reinforcement cage into a whole by using a plurality of Z-shaped steel bars, removing the section steel, and lowering the steel pipe column until the top surface reaches the designed elevation, and then carrying out concrete pouring.
Further, the tower crane steel pipe columns are seamless steel pipe columns, the number of the tower crane steel pipe columns under the same bearing platform is four, and the four tower crane steel pipe columns are distributed in a matrix;
the outer diameter of the outer reinforcement cage is 700-900mm, the outer diameter of the inner reinforcement cage is 350-450mm, the outer diameter of the seamless steel pipe column is 500-600mm, and the thickness of the seamless steel pipe column is 10-15mm.
Further, the size of the bearing platform constructed in the step S3 is 5 multiplied by 1.6m, C35 concrete is adopted, the tower crane steel pipe column stretches into the bearing platform for 80cm, and the tower crane pile foundation stretches into the bearing platform for 20cm.
In the step S4, a professional with a special operation certificate of a tower crane installer is dispatched by a tower crane company to be installed in cooperation with the automobile crane.
Further, in the step S6, the reinforcement of the tower crane steel pipe column is performed multiple times after the foundation pit is excavated until the tower crane steel pipe column is exposed outside, a first layer of horizontal support is arranged at a position 25cm away from the lower portion of the tower crane bearing platform, the exposed tower crane steel pipe column is reinforced by using a seamless steel pipe after each section of depth of the foundation pit is excavated, the reinforcement mode comprises the horizontal support, the cross support and the diagonal bracing, the length of a rod piece required by the field actual measurement of a size given by a technician is measured according to the length of the rod piece, the processing length of the rod piece is controlled to allow deviation +/-5 mm, the joint position of the rod piece is cut into an arc by adopting gas cutting, and the reinforced seamless steel pipe can be tightly abutted to the seamless steel pipe column. The welding of the seamless steel tube adopts gas shield welding, the welding adopts a welding rod J502, the width of the welding line is larger than 1cm, and the welding line is full.
Compared with the prior art, the invention has the beneficial effects that:
1. the bottom surface of the tower crane foundation is arranged above the top plate structure of the underground garage by adopting the form of the bored pile, the steel pipe column and the tower crane bearing platform foundation, so that the tower crane is installed and constructed in parallel with the foundation pit, the construction, installation and acceptance cycles of the tower crane foundation are reduced, the tower crane can be put into use before the construction of the main body structure, and the production efficiency is improved;
2. the bottom of the tower crane foundation is positioned above the top plate of the underground garage, and the tower crane part, the bottom plate and the top plate of the underground garage can be poured at one time, so that the need of constructing the bottom plate and the top plate of the tower body part again due to the fact that the tower body passes through the bottom plate and the top plate of the underground garage in the traditional scheme is reduced, the construction process is reduced, and the construction period is shortened;
3. the construction joint reserved when the tower body of the tower crane passes through the bottom plate/top plate part of the underground garage in the traditional scheme is reduced, the water seepage risk possibly brought by the bottom plate and the top plate of the underground garage due to the construction joint is reduced, and the engineering quality can be further improved.
Drawings
FIG. 1 is a schematic diagram of a connection structure of a steel pipe column and a reinforcement cage of a tower crane according to the invention;
FIG. 2 is a schematic top view of the structure of FIG. 1 of the present invention;
FIG. 3 is a schematic diagram of a connection structure between a bearing platform and a steel pipe column of a tower crane according to the present invention;
FIG. 4 is a schematic diagram of the tower crane installation structure of the present invention;
FIG. 5 is a schematic diagram of the structure of the foundation pit after excavation;
fig. 6 is a schematic diagram of a reinforcing structure of a steel pipe column of the tower crane.
Detailed Description
Other advantages and effects of the present application will be readily apparent to those skilled in the art from the present disclosure, by describing embodiments of the present application with specific examples. This application is also intended to cover any adaptations or uses of various embodiments and can be practiced in different but specific details of the subject matter within the scope of the description and from various points of view. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
According to the accompanying figures 1-6, the invention provides a technical scheme that:
the construction method of the steel pipe column tower crane foundation comprises the following construction steps:
s1, constructing a tower crane pile foundation; the tower crane pile foundation is a bored pile, and the construction method of the bored pile comprises the following steps:
s11, construction lofting: determining the layout position of the bored pile according to the construction drawing, leveling the field of the position of the bored pile, and accurately lofting the position of the bored pile by adopting a total station;
s12, embedding a protective barrel: burying a pile casing at the lofting position, and measuring the elevation of the top of the pile casing after the pile casing is buried so as to control the elevation of the pile bottom of the bored pile; the pile casing is made of a steel plate with the thickness of 10-15mm, the inner diameter of the pile casing is 1.0-1.2m, the top surface of the pile casing is 0.5-0.6m higher than the construction ground after the pile casing is buried, the center of the top surface of the pile casing is coincident with the center line of the pile, the plane error is controlled within 50mm, and the gradient is controlled within 1%.
S13, drilling and pore forming: installing a drilling machine after the pile casing is buried, working the drilling machine, detecting the alignment state of drilling mud and the drilling machine at any time in the drilling process, correcting in time when the alignment state is not in accordance with the requirements, and checking the hole after the drilling depth reaches the design requirements; the inspection of the drilled hole comprises the detection of the hole diameter, the hole depth and the hole forming gradient by using a hole detector so as to ensure that the hole forming hole diameter is not smaller than the design hole diameter, the hole forming depth is not smaller than the design hole depth and the hole forming gradient is not larger than 1%.
S14, hole cleaning: the drilling depth meets the design requirement, then the hole is cleaned, the hole is cleaned by adopting a slurry-changing method for construction, and the slurry-changing method comprises the following operation methods: lifting the drill bit by 20-30cm, rotating at a low speed, and then injecting the slurry with smaller relative density and viscosity to replace the slurry containing slag in the hole; mud performance index after hole cleaning: the specific gravity of the slurry within 500mm of the hole bottom is less than 1.25, the sand content is less than or equal to 8 percent, and the viscosity is less than or equal to 28 seconds.
S15, placing a reinforcement cage: after the hole cleaning is finished, the steel bar cage is put into the hole in time, the top end of the steel bar cage is positioned after the steel bar cage is put into the hole, and the steel pipe column of the tower crane is embedded while the steel bar cage is placed;
s16, installing and pouring concrete into the guide pipe: after step S15 is completed, a pouring conduit is installed, and underwater concrete pouring is performed. After the perfusion catheter is installed, the sediment thickness at the bottom of the hole needs to be detected again, and the measured sediment thickness is not more than 100mm. If the thickness of the sediments exceeds the design requirement, carrying out secondary hole cleaning until the sediments are qualified, and when the concrete is poured, ensuring that the embedding depth of the guide pipe is not less than 1m and not more than 3m by the first batch of concrete, controlling the embedding depth of the guide pipe to be 2-6m in the pouring process, controlling the minimum embedding depth to be not less than 1m, and reducing the pouring speed when the concrete is poured to be 1m away from the bottom end of the steel pipe column of the tower crane so as to avoid the phenomena of floating cages, floating pipes and the like.
S2, embedding a steel pipe column of the tower crane in the construction process of the pile foundation of the tower crane; the tower crane steel pipe columns are seamless steel pipe columns, the number of the tower crane steel pipe columns under the same bearing platform is four, the four tower crane steel pipe columns are distributed in a matrix mode, the outer diameter of an outer steel reinforcement cage is 700-900mm, the outer diameter of an inner steel reinforcement cage is 350-450mm, the outer diameter of the seamless steel pipe columns is 500-600mm, the thickness of the seamless steel pipe columns is 10-15mm, embedding of the tower crane steel pipe columns is synchronous with placing of the steel reinforcement cage, and as shown in fig. 1 and 2, the construction method of the tower crane steel pipe columns and the steel reinforcement cage is as follows: a. manufacturing a reinforcement cage: the steel reinforcement cages are inner and outer groups of steel reinforcement cages which are concentrically sleeved, the outer diameter of the outer steel reinforcement cage is larger than the outer diameter of the steel pipe column of the tower crane, and the outer diameter of the inner steel reinforcement cage is smaller than the outer diameter of the steel pipe column of the tower crane; b. hanging and placing a reinforcement cage: firstly, hoisting an outer reinforcement cage into a pile hole, continuously lowering an inner reinforcement cage without taking out a lifting hook of the outer reinforcement cage, and welding the bottoms of the two reinforcement cages into a whole by adopting a plurality of Z-shaped reinforcement bars when the tops of the two reinforcement cages are flush, so that the inner reinforcement cage is exactly positioned in the center of the outer reinforcement cage, and then taking out the lifting hook of the inner reinforcement cage and the reinforcement cage below; c. placing a steel pipe column of the tower crane: two lifting rings which are symmetrically arranged are welded on the side edge of the tower crane steel pipe column 3-3.5m away from the bottom, two section steel is penetrated on the lifting rings and erected on a sleeper on the pile casing, so that an inner reinforcement cage extends into the tower crane steel pipe column for 3-3.5m; d. fixing a steel pipe column of the tower crane: and (3) adjusting the center position of the pile of the steel pipe column of the tower crane, welding the outer side of the steel pipe column of the tower crane and the inner side of the main reinforcement at the top of the outer reinforcement cage into a whole by using a plurality of Z-shaped steel bars, removing the section steel, and lowering the steel pipe column until the top surface reaches the designed elevation, and then carrying out concrete pouring.
In the manufacturing process of the inner and outer reinforcement cages, the inner and outer reinforcement cages can be divided into a plurality of sections which are welded and connected into a whole after being processed, and the sections of the inner and outer reinforcement cages are not positioned on the same plane so as to ensure the structural strength.
S3, as shown in FIG 3, constructing a bearing platform foundation on the steel pipe column of the tower crane; the size of the applied bearing platform is 5 multiplied by 1.6m, C35 concrete is adopted, the steel pipe column of the tower crane stretches into the bearing platform for 80cm, and the pile foundation of the tower crane stretches into the bearing platform for 20cm.
The construction process comprises the following steps: foundation pit excavation, cushion layer construction, bearing platform reinforcement binding, embedded part installation, bearing platform formwork erection, bearing platform concrete pouring, form removal and concrete curing.
Foundation pit excavation of a bearing platform foundation: because the excavation depth of the foundation pit of the bearing platform is shallower, the excavator can be used for matching with manual excavation, 15cm of manual bottom cleaning is reserved at the pit bottom, the distance between the edge of the bearing platform and the edge of the foundation pit is more than 0.5m, and the waste soil stacking is more than 2m away from the excavation opening. Before the pile head is broken, marking an elevation line on the side surface of the pile body by using red paint, and after the pile head is cut, manually chiseling the pile head by adopting an air compressor, and cleaning;
and (3) cushion layer construction: c15 concrete with the thickness of 10cm is poured after pile head breaking and foundation pit floating soil cleaning are completed, and the next working procedure construction can be carried out when the concrete strength reaches 75% of the design strength;
binding reinforcing steel bars of a bearing platform: and (3) carrying out centralized processing on the bearing platform reinforcing steel bars, binding on site, and installing and binding the reinforcing steel bars strictly according to the issued bearing platform reinforcing steel bar layout. After the binding of the steel bars, the grounding steel bars should be marked by red paint in time, and the resistance of the grounding steel bars can enter the next working procedure after being detected to be qualified. In the process of binding the steel bars, the top end of the seamless steel pipe column is required to be sealed and welded by using a steel plate;
installing embedded parts: the tower crane embedded part is assembled by a professional staff of a tower crane leasing company, after the tower crane embedded part is assembled and qualified through the report, the tower crane embedded part can enter the next working procedure for construction, and the tower crane embedded bolt wire head needs to be wrapped by an adhesive tape so as to prevent the wire head from being polluted by concrete and influence the subsequent assembly of the tower crane;
and (3) supporting a bearing platform template: the template adopts a wood form, and the template is vertically arranged after the reinforcement cage is bound. The straightness can be straightened by adopting a wire stretching method, and the verticality can be controlled by adopting a hanging ball method. The reinforcement is through steel pipe, square timber and pull rod, ensures that the template is stable firm, and the size is accurate.
And (3) concrete pouring of the bearing platform: the concrete grade is C35, and commercial concrete is adopted. Three vibrators are prepared before pouring the bearing platform concrete, and one vibrator is reserved.
The concrete is poured in layers, the thickness of the layers is controlled to be 30cm, an inserted vibrator is adopted for vibrating, collision steel bars and embedded parts are forbidden during vibrating, the vibrating bars are required to be inserted and pulled out slowly during vibrating, and the vibrating bars are moved up and down continuously, so that the concrete is uniformly tamped, and foaming on the surface of the concrete is reduced. The vibrating bars are inserted into the lower layer concrete for 5-10cm, the moving distance is not more than 40cm, the vibrating bars are kept 10-15cm with the template wall, and for each vibrating part, the concrete is vibrated until the concrete is compact at the part, namely the concrete does not bubble any more, and the surface of the concrete is flat and has slurry. After the concrete pouring of the bearing platform is completed, the concrete surface should be timely subjected to light harvesting, and after the initial setting of the concrete, the film is covered to ensure that the quality of the concrete is not affected.
Removing the mould and curing the concrete: and after the concrete reaches final setting, covering the concrete with geotextile, and sprinkling water for curing for at least 7 days. And when the concrete reaches 75% of the design strength, the template is removed, and the protection of the periphery and edges of the bearing platform is paid attention to when the template is removed.
S4, as shown in FIG. 4, installing a tower crane on the basis of the bearing platform; the tower crane installation is carried out by dispatching a professional with a special operation certificate of a tower crane installer by a tower crane company to match with the automobile crane. Safety protection measures are needed to be made in the installation process, and full-time safety personnel are dispatched to monitor the construction site in the whole process. The tower crane is installed before the foundation pit is excavated, the material approach road and the automobile crane support site are planned in advance, and the road and the site are replaced and filled when necessary to meet the construction requirement.
S5, excavating a foundation pit in the working range of the tower crane; according to the excavation depth of the foundation pit, the foundation pit is excavated in a layered manner, as shown in fig. 5, the earthwork excavation at the tower crane is planned in advance, the excavation is completed by one blast of gas, the excavation is not pulled, a manual or small-sized appliance is adopted within one meter range of the tower crane, and the stability of the cast-in-place pile and the steel pipe column structure of the tower crane is prevented from being influenced by soil within the disturbance tower crane range. And immediately organizing the next working procedure for construction after the earth excavation at each layer of tower crane is completed.
S6, reinforcing a steel pipe column of the tower crane: the reinforcement of the steel pipe column of the tower crane is carried out for a plurality of times after the foundation pit is excavated until the steel pipe column of the tower crane is exposed outside, as shown in fig. 6, a first layer of horizontal support is arranged at a position 25cm away from the lower part of the bearing platform of the tower crane, seamless steel pipes are used for reinforcing the exposed steel pipe column of the tower crane after each section of depth of the foundation pit is excavated, the reinforcement mode comprises horizontal support, cross support and diagonal bracing, the length of a rod piece required by field actual measurement is carried out according to the size given by a technician, the rod piece is processed, the allowable deviation of the processing length of the rod piece is controlled to be +/-5 mm, the joint position of the rod piece is cut into an arc by adopting gas cutting, and the reinforced seamless steel pipes can be tightly butted with the seamless steel pipe column. The welding of the seamless steel tube adopts gas shielded welding, the welding electrode is J502, the width of the welding seam is more than 1cm, the welding seam is full, and the welding quality requirement is met. Before the seamless steel pipe is welded, concrete and soil are required to be removed from the outer surface of the steel pipe column of the tower crane, and the concrete is removed to the elevation position of the designed pile top.
According to the invention, the form of the bored pile, the steel pipe column and the tower crane foundation is innovatively adopted, the bottom surface of the tower crane foundation is lifted above the top plate structure, compared with the traditional construction scheme, a horse channel is not required to be reserved for the installation of the tower crane in the earlier foundation pit excavation process, and the installation of the tower crane is more convenient; the foundation reinforcement, detection and acceptance work of the tower crane are completed when the foundation pit excavation is completed, and the tower crane can be put into use before the main body structure of the underground garage begins to be constructed; after the main body structure is completed, a reserved construction period is not required for dismantling the tower crane and recovering the position structure of the tower crane, and the construction period is greatly shortened.
According to the invention, the pile length of the cast-in-place pile and the embedding depth of the steel pipe column of the tower crane are calculated and determined according to different tower crane loads. The foundation pit with different excavation depths has no influence on the pile length of the cast-in-situ pile, and is only influenced by geological conditions and upper load.
The above-described embodiments are merely illustrative of the principles of the present application and their effectiveness, and are not intended to limit the present application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications and variations which a person having ordinary skill in the art would accomplish without departing from the spirit and technical spirit disclosed in the present patent application shall be covered by the claims of the present patent application.
Claims (9)
1. A construction method of a steel pipe column tower crane foundation is characterized by comprising the following steps: the construction method comprises the following construction steps:
s1, constructing a tower crane pile foundation;
s2, embedding a steel pipe column of the tower crane in the construction process of the pile foundation of the tower crane;
s3, constructing a bearing platform foundation on the tower crane steel pipe column;
s4, installing a tower crane on the basis of the bearing platform;
s5, excavating a foundation pit in the working range of the tower crane;
s6, reinforcing a steel pipe column of the tower crane;
in the step S1, the tower crane pile foundation is a bored pile, and the construction method of the bored pile comprises the following steps:
s11, construction lofting: determining the layout position of the bored pile according to the construction drawing, leveling the field of the position of the bored pile, and accurately lofting the position of the bored pile by adopting a total station;
s12, embedding a protective barrel: burying a pile casing at the lofting position, and measuring the elevation of the top of the pile casing after the pile casing is buried so as to control the elevation of the pile bottom of the bored pile;
s13, drilling and pore forming: installing a drilling machine after the pile casing is buried, working the drilling machine, detecting the alignment state of drilling mud and the drilling machine at any time in the drilling process, correcting in time when the alignment state is not in accordance with the requirements, and checking the hole after the drilling depth reaches the design requirements;
s14, hole cleaning: the drilling depth meets the design requirement, then the hole is cleaned, the hole is cleaned by adopting a slurry-changing method for construction, and the slurry-changing method comprises the following operation methods: lifting the drill bit by 20-30cm, rotating at a low speed, and then injecting the slurry with relatively low density and viscosity to replace the slurry containing slag in the hole;
s15, placing a reinforcement cage: after the hole cleaning is finished, the steel bar cage is put into the hole in time, the top end of the steel bar cage is positioned after the steel bar cage is put into the hole, and the steel pipe column of the tower crane is embedded while the steel bar cage is placed;
s16, installing and pouring concrete into the guide pipe: after the step S15 is completed, installing a pouring conduit for underwater concrete pouring;
in the step S2, the embedding of the steel pipe column of the tower crane is performed synchronously with the placement of the reinforcement cage, and the construction method of the steel pipe column of the tower crane and the reinforcement cage comprises the following steps: a. manufacturing a reinforcement cage: the steel reinforcement cages are inner and outer groups of steel reinforcement cages which are concentrically sleeved, the outer diameter of the outer steel reinforcement cage is larger than the outer diameter of the steel pipe column of the tower crane, and the outer diameter of the inner steel reinforcement cage is smaller than the outer diameter of the steel pipe column of the tower crane; b. hanging and placing a reinforcement cage: firstly hoisting an outer reinforcement cage into a pile hole, continuously lowering an inner reinforcement cage without taking out a lifting hook of the outer reinforcement cage, and welding the bottoms of the two reinforcement cages into a whole by adopting a plurality of Z-shaped reinforcement bars when the tops of the two reinforcement cages are flush, so that the inner reinforcement cage is exactly positioned in the center of the outer reinforcement cage, then taking out the lifting hook of the inner reinforcement cage, and lowering the reinforcement cage; c. placing a steel pipe column of the tower crane: two lifting rings which are symmetrically arranged are welded on the side edge of the tower crane steel pipe column 3-3.5m away from the bottom, two section steel is penetrated on the lifting rings and erected on a sleeper on the pile casing, so that an inner reinforcement cage extends into the tower crane steel pipe column for 3-3.5m; d. fixing a steel pipe column of the tower crane: and (3) adjusting the central position of the column of the steel pipe column of the tower crane, welding the outer side of the steel pipe column of the tower crane and the inner side of the main reinforcement at the top of the outer reinforcement cage into a whole by using a plurality of Z-shaped steel bars, removing the section steel, lowering the steel pipe column of the tower crane until the top surface reaches the designed elevation, and then pouring concrete.
2. The steel pipe column tower crane foundation construction method according to claim 1, wherein the method comprises the following steps: in the step S12, the pile casing is made of a steel plate with the thickness of 10-15mm, the inner diameter of the pile casing is 1.0-1.2m, the top surface of the pile casing is 0.5-0.6m higher than the construction ground after the pile casing is embedded, the center of the top surface of the pile casing is coincident with the center line of the pile, the plane error is controlled within 50mm, and the gradient is controlled within 1%.
3. The steel pipe column tower crane foundation construction method according to claim 1, wherein the method comprises the following steps: the checking of the drilling in the step S13 comprises the detection of the hole diameter, the hole depth and the hole forming gradient by using a hole detector so as to ensure that the hole forming hole diameter is not smaller than the design hole diameter, the hole forming depth is not smaller than the design hole depth and the hole forming gradient is not larger than 1%.
4. The steel pipe column tower crane foundation construction method according to claim 1, wherein the method comprises the following steps: in the step S16, after the pouring conduit is installed, the thickness of the sediment at the bottom of the hole needs to be detected again, if the thickness of the sediment exceeds the design requirement, the second hole cleaning is performed until the sediment is qualified, when the concrete is poured, the first concrete ensures that the burying depth of the conduit is not less than 1m and not more than 3m, the burying depth of the conduit is controlled to be 2-6m in the pouring process, the minimum burying depth is not less than 1m, and when the concrete is poured to be 1m from the bottom end of the steel pipe column of the tower crane, the pouring speed needs to be reduced.
5. The steel pipe column tower crane foundation construction method according to claim 4, wherein the construction method comprises the following steps: the tower crane steel pipe columns are seamless steel pipe columns, the number of the tower crane steel pipe columns under the same bearing platform is four, and the four tower crane steel pipe columns are distributed in a matrix;
the outer diameter of the outer reinforcement cage is 700-900mm, the outer diameter of the inner reinforcement cage is 350-450mm, the outer diameter of the seamless steel pipe column is 500-600mm, and the thickness of the seamless steel pipe column is 10-15mm.
6. The steel pipe column tower crane foundation construction method according to claim 1, wherein the method comprises the following steps: the size of the bearing platform constructed in the step S3 is 5 multiplied by 1.6m, C35 concrete is adopted, the steel pipe column of the tower crane stretches into the bearing platform for 80cm, and the pile foundation of the tower crane stretches into the bearing platform for 20cm.
7. The steel pipe column tower crane foundation construction method according to claim 1, wherein the method comprises the following steps: in the step S4, the tower crane is installed by dispatching a professional with a special operation certificate of a tower crane installer by a tower crane company and matching the professional with the automobile crane.
8. The steel pipe column tower crane foundation construction method according to claim 7, wherein: the reinforcement of the tower crane steel pipe column in the step S6 is carried out after a foundation pit is excavated until the tower crane steel pipe column is exposed outside, the reinforcement is carried out for a plurality of times, a first layer of transverse horizontal support is arranged at a position 25cm away from the lower portion of a tower crane bearing platform, the exposed tower crane steel pipe column is reinforced by using a seamless steel pipe after each section of foundation pit is excavated to a certain depth, the reinforcement mode comprises horizontal support, cross support and diagonal bracing, the length of a rod piece required by field actual measurement is carried out according to the size given by a technician, the rod piece is processed, the allowable deviation of the processing length of the rod piece is controlled to be +/-5 mm, the joint position of the rod piece is cut into an arc by adopting gas cutting, and the reinforced seamless steel pipe can be tightly butted with the tower crane steel pipe column.
9. The steel pipe column tower crane foundation construction method according to claim 8, wherein: the seamless steel pipe is reinforced by gas shielded welding, wherein welding rods J502 are adopted in welding, the width of a welding line is larger than 1cm, and the welding line is full.
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