CN114134928A - Steel pipe column tower crane foundation construction method - Google Patents
Steel pipe column tower crane foundation construction method Download PDFInfo
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- CN114134928A CN114134928A CN202111627741.9A CN202111627741A CN114134928A CN 114134928 A CN114134928 A CN 114134928A CN 202111627741 A CN202111627741 A CN 202111627741A CN 114134928 A CN114134928 A CN 114134928A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 154
- 239000010959 steel Substances 0.000 title claims abstract description 154
- 238000010276 construction Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000009412 basement excavation Methods 0.000 claims abstract description 20
- 238000009434 installation Methods 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 230000002787 reinforcement Effects 0.000 claims description 96
- 238000005553 drilling Methods 0.000 claims description 43
- 238000003466 welding Methods 0.000 claims description 27
- 238000004140 cleaning Methods 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 15
- 238000011065 in-situ storage Methods 0.000 claims description 10
- 239000013049 sediment Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
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- 241001669679 Eleotris Species 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000005429 filling process Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims 1
- 239000011148 porous material Substances 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 238000007667 floating Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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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, pre-burying a tower crane steel pipe column in the tower crane pile foundation construction process; s3, constructing a bearing platform foundation on the tower crane steel pipe column; s4, carrying out tower crane installation on the foundation of the bearing platform; s5, performing foundation pit excavation within 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 installation of the tower crane and the construction of a foundation pit are performed in parallel, the construction, installation and acceptance period of the tower crane foundation is reduced, the tower crane can be put into use before the construction of a main body structure, and the production efficiency is improved; the bottom of the tower crane foundation is located above the top plate of the underground garage, the tower crane part and the bottom plate and the top plate of the underground garage can be poured at one time, the problem that the bottom plate and the top plate of the tower body part need to be constructed again due to the fact that the tower body penetrates through the bottom plate and the top plate of the underground garage in the traditional scheme is solved, construction procedures are reduced, and construction period is shortened.
Description
Technical Field
The 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 transport hub projects, underground garages need to be constructed below the ground, the garages generally have large occupied areas, materials are transported by tower cranes completely, and the transportation task is difficult. The traditional tower crane construction sequence is that tower crane foundation and tower crane installation construction are carried out again after foundation pit excavation is accomplished, lead to the foundation pit excavation to accomplish the back, can't get into next process immediately. And the tower crane foundation construction, tower crane installation, acceptance period are longer, the normal operation time of tower crane lags behind the construction production requirement, and the construction production progress and the node construction period are extremely unfavorable.
Disclosure of Invention
In view of the defects of the prior art, the purpose of the patent application is to provide a construction method of 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 installation and acceptance time of the tower crane foundation, improves the construction production efficiency, and completes the node target on schedule.
In order to achieve the purpose, the invention provides the following technical scheme:
a construction method of a steel pipe column tower crane foundation comprises the following construction steps:
s1, constructing a tower crane pile foundation;
s2, pre-burying a tower crane steel pipe column in the tower crane pile foundation construction process;
s3, constructing a bearing platform foundation on the tower crane steel pipe column;
s4, carrying out tower crane installation on the foundation of the bearing platform;
s5, performing foundation pit excavation within 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 cast-in-place bored pile, and the construction method of the cast-in-place bored pile includes the following steps:
s11, construction lofting: determining the arrangement position of the cast-in-situ bored pile according to a construction drawing, leveling the position of the cast-in-situ bored pile, and performing accurate lofting on the position of the cast-in-situ bored pile by using a total station;
s12, embedding a protective sleeve: embedding a pile casing in a lofting position, and measuring the top elevation of the pile casing after the pile casing is embedded so as to control the pile bottom elevation of the drilled pile;
s13, drilling to form a hole: installing a drilling machine after the protective cylinder is buried, wherein the drilling machine works, in the drilling process, the drilling mud and the alignment state of the drilling machine are detected at any time, the drilling mud and the alignment state of the drilling machine are corrected in time when the drilling mud and the alignment state of the drilling machine do not meet the requirements, and the formed hole is checked after the drilling depth meets the design requirements;
s14, cleaning holes: and cleaning the holes after the drilling depth meets the design requirement, wherein the cleaning is carried out by adopting a slurry changing method, and the operation method of the slurry changing method comprises the following steps: lifting the drill bit by 20-30 cm, rotating at a low speed, and then injecting dilute slurry with low relative density and viscosity to replace slurry containing slag in the hole;
s15, placing a reinforcement cage: after hole cleaning is finished, the reinforcement cage is placed into the hole in time, the top end of the reinforcement cage is positioned after the reinforcement cage is placed into the hole, and the steel pipe column of the tower crane is embedded while the reinforcement cage is placed;
s16, installing and pouring concrete in a guide pipe: after completion of step S15, the 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 diameter of 10-15mm, the inner diameter of the pile casing is 1.0-1.2m, the top surface of the pile casing after being embedded is 0.5-0.6m higher than the construction ground, 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 inclination is controlled within 1%.
Further, the checking of the drilling in step S13 includes detecting the aperture, the hole depth, and the inclination of the drilling hole by using a hole probing device, so as to ensure that the hole-drilling aperture is not smaller than the design aperture, the hole-drilling depth is not smaller than the design hole depth, and the inclination of the drilling hole is not greater than 1%.
Further, in the step S16, after the filling 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 hole is cleaned for the second time until the sediment is qualified, when the concrete is filled, the first batch of concrete ensures that the embedding depth of the pipe is not less than 1m and not more than 3m, the embedding depth of the pipe is controlled to be 2-6m and the minimum embedding depth is not less than 1m in the filling process, and when the concrete is filled to 1m from the bottom end of the tower crane steel pipe column, the filling speed needs to be reduced so as to avoid the occurrence of the phenomena of floating cages, floating pipes and the like.
Further, in step S2, the pre-burying of the tower crane steel pipe column is performed synchronously with the placement of the reinforcement cage, and the construction method of the tower crane steel pipe column and the reinforcement cage is as follows: a. manufacturing a steel reinforcement cage: the steel reinforcement cage is an inner steel reinforcement cage and an outer steel reinforcement cage which are concentrically sleeved, the outer diameter of the outer steel reinforcement cage is larger than the outer diameter of the tower crane steel pipe column, and the outer diameter of the inner steel reinforcement cage is smaller than the outer diameter of the tower crane steel pipe column; b. hoisting a steel 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, welding the bottoms of the two reinforcement cages into a whole by adopting a plurality of Z-shaped reinforcements when the tops of the two reinforcement cages are flush, enabling the inner reinforcement cage to be just positioned at the center of the outer reinforcement cage, and then taking out the lifting hook of the inner reinforcement cage and the reinforcement cage below the inner reinforcement cage; c. placing a steel pipe column of the tower crane: welding two symmetrically-arranged hanging rings on the side edge of the tower crane steel pipe column 3-3.5m away from the bottom, and penetrating two section steels on the hanging rings to be erected on a sleeper on the protective cylinder, so that the inner reinforcement cage extends into the tower crane steel pipe column by 3-3.5 m; d. fixing a steel pipe column of the tower crane: the pile central point of tower crane steel-pipe column has been adjusted puts, uses many "Z shape" reinforcing bars to weld the tower crane steel-pipe column outside and the inboard of outer reinforcing bar cage top owner muscle into whole, gets the shaped steel after that, transfers the steel-pipe column to the top surface and reaches the design elevation, later carries out the concrete and fills.
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 manner;
the outer diameter of the outer steel reinforcement cage is 700-900mm, the outer diameter of the inner steel 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 10-15 mm.
Further, the size of the bearing platform constructed in the step S3 is 5 × 5 × 1.6m, C35 concrete is adopted, the steel pipe column of the tower crane extends into the interior of the bearing platform by 80cm, and the pile foundation of the tower crane extends into the bearing platform by 20 cm.
Further, in the step S4, the tower crane installation is performed by dispatching a professional with a special operation certificate of a tower crane installer by a tower crane company to cooperate with a truck crane.
Further, the reinforcement of the tower crane steel pipe column in the step S6 is performed for 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 below a tower crane bearing platform, the exposed tower crane steel pipe column is reinforced by using a seamless steel pipe after the foundation pit is excavated by a certain depth, the reinforcement mode comprises horizontal support, cross support and diagonal web support, the required rod length is actually measured on the site according to the size given by a technician, the rod piece of the seamless steel pipe is processed, the allowable deviation of the processed length of the rod piece is controlled to be +/-5 mm, the joint position of the rod piece is cut into an arc by gas cutting, and the reinforced seamless steel pipe can be tightly butted with the seamless steel pipe column. The welding of the seamless steel tube adopts gas shielded welding, the welding rod adopted in the welding is J502, the width of the welding seam is larger than 1cm, and the welding seam 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 a bored pile, a steel pipe column and a tower crane bearing platform foundation, so that the installation of the tower crane is parallel to the foundation pit, the construction, installation and acceptance period of the tower crane foundation is shortened, the tower crane can be put into use before the construction of a 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 and the bottom plate and the top plate of the underground garage can be poured at one time, so that the problem that the bottom plate and the top plate of the tower body part need to be constructed again because 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 saved;
3. the construction joints left in the position where the tower crane body of the traditional scheme passes through the bottom plate/top plate of the underground garage are reduced, the water seepage risk possibly brought by the bottom plate and the top plate of the underground garage due to the construction joints is reduced, and the engineering quality can be further improved.
Drawings
FIG. 1 is a schematic view of a connection structure of a tower crane steel pipe column and a reinforcement cage;
FIG. 2 is a schematic top view of the structure of FIG. 1 according to the present invention;
FIG. 3 is a schematic view of a connection structure of a bearing platform and a tower crane steel pipe column;
FIG. 4 is a schematic view of a tower crane installation structure of the present invention;
FIG. 5 is a schematic view of the excavated structure of the foundation pit according to the present invention;
FIG. 6 is a schematic view of a tower crane steel pipe column reinforcing structure.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and variations in various respects, all without departing from the spirit of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
According to the attached drawings 1-6, the invention provides a technical scheme that:
a construction method of a 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 cast-in-place bored pile, and the construction method of the cast-in-place bored pile comprises the following steps:
s11, construction lofting: determining the arrangement position of the cast-in-situ bored pile according to a construction drawing, leveling the position of the cast-in-situ bored pile, and performing accurate lofting on the position of the cast-in-situ bored pile by using a total station;
s12, embedding a protective sleeve: embedding a pile casing in a lofting position, and measuring the top elevation of the pile casing after the pile casing is embedded so as to control the pile bottom elevation of the drilled pile; the pile casing is made of a steel plate with the diameter 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 coincided with the center line of the pile, the plane error is controlled within 50mm, and the inclination is controlled within 1%.
S13, drilling to form a hole: installing a drilling machine after the protective cylinder is buried, wherein the drilling machine works, in the drilling process, the drilling mud and the alignment state of the drilling machine are detected at any time, the drilling mud and the alignment state of the drilling machine are corrected in time when the drilling mud and the alignment state of the drilling machine do not meet the requirements, and the formed hole is checked after the drilling depth meets the design requirements; the detection of the drilling comprises the detection of the pore diameter, the pore depth and the pore-forming gradient by using a hole detector so as to ensure that the pore diameter of the formed pore is not less than the designed pore diameter, the pore-forming depth is not less than the designed pore depth, and the pore-forming gradient is not more than 1%.
S14, cleaning holes: and cleaning the holes after the drilling depth meets the design requirement, wherein the cleaning is carried out by adopting a slurry changing method, and the operation method of the slurry changing method comprises the following steps: lifting the drill bit by 20-30 cm, rotating at a low speed, and then injecting dilute slurry with low relative density and viscosity to replace slurry containing slag in the hole; performance indexes of the slurry after hole cleaning are as follows: 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 s.
S15, placing a reinforcement cage: after hole cleaning is finished, the reinforcement cage is placed into the hole in time, the top end of the reinforcement cage is positioned after the reinforcement cage is placed into the hole, and the steel pipe column of the tower crane is embedded while the reinforcement cage is placed;
s16, installing and pouring concrete in a guide pipe: after completion of step S15, the pouring conduit is installed and underwater concrete pouring is performed. After the perfusion catheter is installed, the thickness of the sediments at the bottom of the hole needs to be detected again, and the measured thickness of the sediments is not more than 100 mm. If the thickness of the sediments exceeds the design requirement, cleaning the holes for the second time till the sediments are qualified, when concrete is poured, the first batch of concrete ensures that the buried depth of the guide pipe is not less than 1m and not more than 3m, the buried depth of the guide pipe is controlled to be 2-6m in the pouring process, the minimum buried depth is not less than 1m, and when the concrete is poured to be 1m away from the bottom end of the tower crane steel pipe column, the pouring speed needs to be reduced so as to avoid the occurrence of phenomena such as floating cages and floating pipes.
S2, pre-burying a tower crane steel pipe column in the tower crane pile foundation construction process; the tower crane steel pipe column is seamless steel pipe column, the number of tower crane steel pipe column under the same cushion cap is four, and four tower crane steel pipe columns are matrix distribution, the external diameter of outer steel reinforcement cage is 700 and adds a jar 900mm, the external diameter of interior steel reinforcement cage is 350 and adds a jar 450mm, the external diameter of seamless steel pipe column is 500 and adds a jar 600mm, the thickness of seamless steel pipe column is 10-15mm, pre-buried of tower crane steel pipe column is laid with the steel reinforcement cage and is gone on in step, as shown in fig. 1 and 2, the construction method of tower crane steel pipe column and steel reinforcement cage is: a. manufacturing a steel reinforcement cage: the steel reinforcement cage is an inner steel reinforcement cage and an outer steel reinforcement cage which are concentrically sleeved, the outer diameter of the outer steel reinforcement cage is larger than the outer diameter of the tower crane steel pipe column, and the outer diameter of the inner steel reinforcement cage is smaller than the outer diameter of the tower crane steel pipe column; b. hoisting a steel 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, welding the bottoms of the two reinforcement cages into a whole by adopting a plurality of Z-shaped reinforcements when the tops of the two reinforcement cages are flush, enabling the inner reinforcement cage to be just positioned at the center of the outer reinforcement cage, and then taking out the lifting hook of the inner reinforcement cage and the reinforcement cage below the inner reinforcement cage; c. placing a steel pipe column of the tower crane: welding two symmetrically-arranged hanging rings on the side edge of the tower crane steel pipe column 3-3.5m away from the bottom, and penetrating two section steels on the hanging rings to be erected on a sleeper on the protective cylinder, so that the inner reinforcement cage extends into the tower crane steel pipe column by 3-3.5 m; d. fixing a steel pipe column of the tower crane: the pile central point of tower crane steel-pipe column has been adjusted puts, uses many "Z shape" reinforcing bars to weld the tower crane steel-pipe column outside and the inboard of outer reinforcing bar cage top owner muscle into whole, gets the shaped steel after that, transfers the steel-pipe column to the top surface and reaches the design elevation, later carries out the concrete and fills.
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 welding 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 the figure 3, constructing a bearing platform foundation on the steel pipe column of the tower crane; the size of the fabricated bearing platform is 5 multiplied by 1.6m, C35 concrete is adopted, the steel pipe column of the tower crane extends into the interior of the bearing platform by 80cm, and the pile foundation of the tower crane extends into the bearing platform by 20 cm.
The construction process comprises the following steps: excavation of a foundation pit → construction of a cushion layer → reinforcement of a bearing platform → installation of embedded parts → erection of a template of the bearing platform → concrete pouring of the bearing platform → form removal and concrete curing.
Excavating a foundation pit of the bearing platform foundation: because the excavation depth of the foundation pit of the bearing platform is shallow, an excavator can be adopted to cooperate 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 spoil stacking is far away from an excavation opening by more than 2 m. Before the pile head is broken, marking an elevation line on the side surface of the pile body by using red paint, after the pile head is circularly cut, chiseling the pile head by adopting an air compressor and combining manual work, and cleaning;
cushion layer construction: after pile head breaking and foundation pit floating soil cleaning are completed, C15 concrete with the thickness of 10cm is poured, and next procedure construction can be carried out by the person until the strength of the concrete reaches 75% of the designed strength;
binding reinforcing steel bars of the bearing platform: and (4) centralized processing of the reinforcing steel bars of the bearing platform, binding on site, and installing and binding the reinforcing steel bars strictly according to the issued arrangement diagram of the reinforcing steel bars of the bearing platform. After the steel bars are bound, the grounding steel bars are timely marked by red paint, and the next procedure can be carried out only after the resistance of the grounding steel bars is detected to be qualified. In the process of binding the reinforcing steel bars, the top end of the seamless steel pipe column needs to be sealed and welded by a steel plate;
installing an embedded part: the tower crane embedded part is installed by a tower crane leasing company for requesting a professional to install, after the tower crane embedded part is installed and is qualified through report, the next procedure construction can be carried out, the screw head of a tower crane embedded bolt needs to be wrapped by an adhesive tape so as to prevent the screw head from being polluted by concrete and influencing the subsequent installation of the tower crane;
erecting a bearing platform template: the template adopts a wood pattern, and is vertically arranged after the reinforcement cage is bound. The verticality can be controlled by adopting a thread tightening method and a hanging ball method. The reinforcing is through steel pipe, square timber and pull rod, ensures that the template is stable firm, the size is accurate.
Pouring concrete on the bearing platform: the concrete grade was C35, and commercial concrete was used. Before pouring the concrete of the bearing platform, three vibrators are prepared, wherein one vibrator is standby.
Concrete is poured in layers, the thickness of each layer is controlled to be 30cm, an insertion type vibrator is adopted for vibration, steel bars and embedded parts are strictly forbidden to collide during vibration, the vibrating bars are required to be quickly inserted and slowly pulled out during vibration and continuously move up and down, so that the concrete is uniformly tamped, and the surface blistering of the concrete is reduced. The vibrating rod is inserted into the lower layer concrete for 5-10cm, the moving distance is not more than 40cm, the vibrating rod keeps 10-15cm with the template wall, and each vibrating part vibrates until the concrete at the part is compact, namely the concrete does not bubble any more, and the surface is flat and has slurry. After concrete pouring of the bearing platform is completed, the concrete surface is required to be smoothed in time, and after the concrete is initially set, a thin film is covered to ensure that the quality of the concrete is not influenced.
Removing the formwork and curing the concrete: and after the concrete reaches final setting, covering the concrete with geotextile, and watering for curing, wherein the curing time is not less than 7 days. And (3) removing the template after the concrete reaches 75% of the designed strength, and paying attention to the protection of the periphery and edges and corners of the bearing platform when the template is removed.
S4, as shown in the figure 4, installing a tower crane on the basis of a 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 cooperate with a truck crane. Safety protection measures are required to be made in the installation process, and full-process monitoring is carried out on the construction site by dispatching professional safety personnel. The tower crane installation is carried out before foundation pit excavation, a material approach road and an automobile crane support field are planned in advance, and the road and the field need to be replaced and filled to meet construction requirements when necessary.
S5, performing foundation pit excavation within the working range of the tower crane; according to the excavation depth of the foundation pit, the foundation pit is excavated in layers, as shown in fig. 5, the earth excavation at the tower crane is planned in advance, the excavation is completed by blowing air, the tower crane cannot be dragged, manual work or small-sized tools are adopted for excavation within a one-meter range of the tower crane, and the influence of soil within the range of the tower crane on the stability of a filling pile and a steel pipe column structure of the tower crane is prevented. And immediately organizing next procedure construction after the earth excavation at the tower crane position of each layer is finished.
S6, reinforcing the steel pipe column of the tower crane: the reinforcement of tower crane steel-pipe column is consolidated for a plurality of times after the tower crane steel-pipe column exposes outside in foundation ditch excavation, as shown in fig. 6, arrange the horizontal support of first layer at 25cm department below the tower crane cushion cap, the tower crane steel-pipe column that exposes is reinforced with seamless steel pipe after excavating one section degree of depth in foundation ditch, the reinforcement mode includes horizontal support, cross support and diagonal bracing, according to the required member length of the on-the-spot actual measurement of the size that technical staff gave, and carry out the member processing of seamless steel pipe, member processing length control allowed deviation 5mm, member joint position adopts the gas cutting to become the circular arc, make the seamless steel pipe of reinforcement can closely dock seamless steel-pipe column. The welding of the seamless steel tube adopts gas shielded welding, the welding rod adopted in the welding is J502, the width of the welding seam is larger than 1cm, the welding seam is full, and the welding quality requirement is met. Before welding the seamless steel pipe, chiseling concrete and soil attached to the outside of the steel pipe column of the tower crane, and chiseling the concrete to the elevation position of the designed pile top.
According to the invention, the form of the cast-in-situ bored pile, the steel pipe column and the tower crane foundation is innovatively adopted, the bottom surface of the tower crane foundation is lifted to the upper part of the top plate structure, compared with the traditional construction scheme, a berm is not required to be reserved for tower crane installation in the early foundation pit excavation process, and the tower crane installation is more convenient; the foundation reinforcement and detection acceptance work of the tower crane is completed when the foundation pit excavation is completed, and the tower crane can be put into use before the main structure of the underground garage starts to be constructed; after the main structure is completed, the construction period does not need to be reserved for tower crane dismantling and tower crane position structure recovery, and the construction period is greatly shortened.
According to the method, the length of the cast-in-place pile and the embedding depth of the steel pipe column of the tower crane are determined by calculation according to different tower crane loads. Foundation pits with different excavation depths have no influence on the length of the cast-in-place pile and are only influenced by geological conditions and upper load.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.
Claims (10)
1. A construction method of a steel pipe column tower crane foundation is characterized by comprising the following construction steps:
s1, constructing a tower crane pile foundation;
s2, pre-burying a tower crane steel pipe column in the tower crane pile foundation construction process;
s3, constructing a bearing platform foundation on the tower crane steel pipe column;
s4, carrying out tower crane installation on the foundation of the bearing platform;
s5, performing foundation pit excavation within the working range of the tower crane;
s6, reinforcing the steel pipe column of the tower crane.
2. The construction method of the steel pipe column tower crane foundation according to claim 1, wherein the tower crane pile foundation in the step S1 is a cast-in-place bored pile, and the construction method of the cast-in-place bored pile comprises the following steps:
s11, construction lofting: determining the arrangement position of the cast-in-situ bored pile according to a construction drawing, leveling the position of the cast-in-situ bored pile, and performing accurate lofting on the position of the cast-in-situ bored pile by using a total station;
s12, embedding a protective sleeve: embedding a pile casing in a lofting position, and measuring the top elevation of the pile casing after the pile casing is embedded so as to control the pile bottom elevation of the drilled pile;
s13, drilling to form a hole: installing a drilling machine after the protective cylinder is buried, wherein the drilling machine works, in the drilling process, the drilling mud and the alignment state of the drilling machine are detected at any time, the drilling mud and the alignment state of the drilling machine are corrected in time when the drilling mud and the alignment state of the drilling machine do not meet the requirements, and the formed hole is checked after the drilling depth meets the design requirements;
s14, cleaning holes: and cleaning the holes after the drilling depth meets the design requirement, wherein the cleaning is carried out by adopting a slurry changing method, and the operation method of the slurry changing method comprises the following steps: lifting the drill bit by 20-30 cm, rotating at a low speed, and then injecting dilute slurry with low relative density and viscosity to replace slurry containing slag in the hole;
s15, placing a reinforcement cage: after hole cleaning is finished, the reinforcement cage is placed into the hole in time, the top end of the reinforcement cage is positioned after the reinforcement cage is placed into the hole, and the steel pipe column of the tower crane is embedded while the reinforcement cage is placed;
s16, installing and pouring concrete in a guide pipe: after completion of step S15, the pouring conduit is installed and underwater concrete pouring is performed.
3. The construction method of the steel pipe column tower crane foundation according to claim 2, characterized by comprising the following steps: in the step S12, the pile casing is made of a steel plate with the diameter 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 superposed with the center line of the pile, the plane error is controlled within 50mm, and the inclination is controlled within 1%.
4. The construction method of the steel pipe column tower crane foundation according to claim 2, characterized by comprising the following steps: the checking of the drilling in the step S13 includes detecting the hole diameter, the hole depth, and the hole-forming inclination by using a hole detector 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 inclination is not greater than 1%.
5. The construction method of the steel pipe column tower crane foundation according to claim 2, characterized by comprising the following steps: in the step S16, after the filling 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 hole is cleaned for the second time until the sediment is qualified, when the concrete is filled, the first batch of concrete ensures that the embedding depth of the pipe is not less than 1m and not more than 3m, the embedding depth of the pipe is controlled to be 2-6m and the minimum embedding depth is not less than 1m during the filling process, and when the concrete is filled to 1m from the bottom end of the tower crane steel pipe column, the filling speed needs to be reduced.
6. The construction method of the steel pipe column tower crane foundation according to claim 2, characterized by comprising the following steps: in the step S2, the pre-burying of the tower crane steel pipe column is performed synchronously with the placement of the reinforcement cage, and the construction method of the tower crane steel pipe column and the reinforcement cage comprises the following steps: a. manufacturing a steel reinforcement cage: the steel reinforcement cage is an inner steel reinforcement cage and an outer steel reinforcement cage which are concentrically sleeved, the outer diameter of the outer steel reinforcement cage is larger than the outer diameter of the tower crane steel pipe column, and the outer diameter of the inner steel reinforcement cage is smaller than the outer diameter of the tower crane steel pipe column; b. hoisting a steel 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, welding the bottoms of the two reinforcement cages into a whole by adopting a plurality of Z-shaped reinforcements when the tops of the two reinforcement cages are flush, enabling the inner reinforcement cage to be just positioned at the center of the outer reinforcement cage, and then taking out the lifting hook of the inner reinforcement cage and the reinforcement cage below the inner reinforcement cage; c. placing a steel pipe column of the tower crane: welding two symmetrically-arranged hanging rings on the side edge of the tower crane steel pipe column 3-3.5m away from the bottom, and penetrating two section steels on the hanging rings to be erected on a sleeper on the protective cylinder, so that the inner reinforcement cage extends into the tower crane steel pipe column by 3-3.5 m; d. fixing a steel pipe column of the tower crane: the pile central point of tower crane steel-pipe column has been adjusted puts, uses many "Z shape" reinforcing bars to weld the tower crane steel-pipe column outside and the inboard of outer reinforcing bar cage top owner muscle into whole, gets the shaped steel after that, transfers the steel-pipe column to the top surface and reaches the design elevation, later carries out the concrete and fills.
7. The construction method of the steel pipe column tower crane foundation according to claim 6, characterized by comprising 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 manner;
the outer diameter of the outer steel reinforcement cage is 700-900mm, the outer diameter of the inner steel 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 10-15 mm.
8. The construction method of the steel pipe column tower crane foundation according to claim 1, characterized by comprising 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 extends into the interior of the bearing platform by 80cm, and the pile foundation of the tower crane extends into the bearing platform by 20 cm.
9. The construction method of the steel pipe column tower crane foundation according to claim 1, characterized by comprising the following steps: and 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 to match with a truck crane.
10. The construction method of the steel pipe column tower crane foundation according to claim 9, characterized by comprising the following steps: and S6, reinforcing the tower crane steel pipe column for multiple times after a foundation pit is excavated until the tower crane steel pipe column is exposed outside, arranging a first layer of horizontal support at a position 25cm below a tower crane bearing platform, reinforcing the exposed tower crane steel pipe column by using a seamless steel pipe after the foundation pit is excavated by a certain depth, wherein the reinforcing mode comprises horizontal support, cross support and diagonal bracing, actually measuring the length of a required rod piece according to the size given by a technician on site, processing the rod piece of the seamless steel pipe, controlling the allowable deviation of the processed length of the rod piece to +/-5 mm, cutting the joint position of the rod piece into an arc by gas cutting, and enabling the reinforced seamless steel pipe to be in close butt joint with the seamless steel pipe column. The welding of the seamless steel tube adopts gas shielded welding, the welding rod adopted in the welding is J502, the width of the welding seam is larger than 1cm, and the welding seam is full.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837213A (en) * | 2022-05-23 | 2022-08-02 | 中国二十二冶集团有限公司 | Tower crane foundation structure and construction method thereof |
| CN115198787A (en) * | 2022-07-19 | 2022-10-18 | 中铁建工集团有限公司 | Steel pipe column type tower crane foundation, construction method thereof and cover-excavation top-down construction method |
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|---|---|---|---|---|
| JP2009162034A (en) * | 2008-01-10 | 2009-07-23 | Tokyo Electric Power Co Inc:The | Method of constructing foundation of structure |
| CN215105474U (en) * | 2021-06-18 | 2021-12-10 | 中建一局集团建设发展有限公司 | Ultra-deep foundation pit tower crane lattice type bearing platform foundation system |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009162034A (en) * | 2008-01-10 | 2009-07-23 | Tokyo Electric Power Co Inc:The | Method of constructing foundation of structure |
| CN215105474U (en) * | 2021-06-18 | 2021-12-10 | 中建一局集团建设发展有限公司 | Ultra-deep foundation pit tower crane lattice type bearing platform foundation system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837213A (en) * | 2022-05-23 | 2022-08-02 | 中国二十二冶集团有限公司 | Tower crane foundation structure and construction method thereof |
| CN115198787A (en) * | 2022-07-19 | 2022-10-18 | 中铁建工集团有限公司 | Steel pipe column type tower crane foundation, construction method thereof and cover-excavation top-down construction method |
| CN115198787B (en) * | 2022-07-19 | 2023-10-27 | 中铁建工集团有限公司 | Steel tube column type tower crane foundation and construction method thereof, and cover-excavation reverse construction method |
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