CN115369858B - Construction process of concrete filled steel tubular column - Google Patents
Construction process of concrete filled steel tubular column Download PDFInfo
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- CN115369858B CN115369858B CN202210909034.7A CN202210909034A CN115369858B CN 115369858 B CN115369858 B CN 115369858B CN 202210909034 A CN202210909034 A CN 202210909034A CN 115369858 B CN115369858 B CN 115369858B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 452
- 239000010959 steel Substances 0.000 title claims abstract description 452
- 239000004567 concrete Substances 0.000 title claims abstract description 173
- 238000010276 construction Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims abstract 4
- 239000010410 layer Substances 0.000 claims description 53
- 239000002356 single layer Substances 0.000 claims description 15
- 239000011435 rock Substances 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000002689 soil Substances 0.000 description 15
- 238000009434 installation Methods 0.000 description 5
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/40—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds in open water
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction process of a concrete filled steel tubular column, which comprises the following steps: the steel pipe is sleeved with a steel protection cylinder, and the steel pipe and the steel protection cylinder are assembled into a whole by adopting a positioning bracket and an auxiliary device; lifting the assembled structure, lowering, and installing a drilling machine on the construction surface at the bottom of the steel casing; controlling the steel pipe and the steel casing to sink to the designed elevation synchronously through the rotary digging of the drilling machine; s4, taking out the drilling machine and evacuating slurry and water in the steel casing; removing the positioning support after pouring the bottom layer concrete, pulling up the steel pile casing layer by layer, and synchronously pouring the steel pipe concrete of the corresponding stratum; and continuously pulling up the steel protective cylinder until the steel protective cylinder is separated from the steel pipe, and pouring the residual steel pipe concrete. According to the invention, the steel pile casing is assembled with the steel pipe, and the integral sinking of the assembled structure is realized by synchronously digging downwards in cooperation with the drilling machine, so that the influence of external factors on positioning accuracy is reduced; and after the steel pipe is sunk in place, the steel pile casing is gradually pulled out according to the stratum structure, and meanwhile, the steel pipe concrete pouring is completed in a layered mode, so that the construction stability and the construction quality are ensured.
Description
Technical Field
The invention relates to the technical field of steel structure construction. More particularly, the invention relates to a construction process of a concrete filled steel tubular column.
Background
With the rapid development of the steel structure industry in China, the design, manufacturing and installation technology of the steel structure engineering is gradually oriented to the promotion and development of large and complex constructional engineering. The concrete filled steel tubular column is widely used because of its good compression resistance, bearing strength and deformation resistance. Compared with a pure steel structure, the steel pipe concrete structure has the advantages of steel saving, high rigidity, good stability, strong rust prevention and fire resistance, and the like; compared with the reinforced concrete structure, the steel pipe concrete structure has the advantages of light dead weight, high strength, excellent anti-seismic performance, energy saving, land saving, short construction period and the like.
The common construction method of the concrete filled steel tube column comprises the following steps: firstly, inserting the steel pipe into a pre-dug pile hole, and then filling concrete into the steel pipe to solidify the steel pipe and the pile bottom structure and form a column. The construction process is simple to operate, the pile forming quality of concrete is good, but when facing a complex or severe geological environment (such as underwater or soft geology), the pile hole is insufficient in supporting force, the problems of collapse, collapse and the like easily occur before the steel pipe is placed and in the installation process, the positioning accuracy and the installation efficiency of the steel pipe are affected, the external impact force which can be born by the thin-wall steel pipe before filling the concrete is small, the pile forming quality of the steel pipe concrete column is seriously affected by the damage or deformation easily occurring under the condition that the external environment is severe or the pile hole is unstable.
In order to solve the problems, a construction process of the concrete filled steel tubular column needs to be designed, and the construction efficiency and the construction quality are ensured while the construction process is suitable for various geological environments.
Disclosure of Invention
The invention aims to provide a construction process of a concrete filled steel tubular column, which realizes the integral sinking of a spliced structure by splicing a steel casing and a steel tube and synchronously digging downwards by matching with a drilling machine, thereby reducing the influence of external factors on positioning accuracy; and after the steel pipe is sunk in place, the steel pile casing is gradually pulled out according to the stratum structure, and meanwhile, the steel pipe concrete pouring is completed in a layered mode, so that the construction stability and the construction quality are ensured.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a concrete filled steel tubular column construction process comprising:
s1, sleeving a steel protection cylinder on the outer side of a steel pipe, fixedly connecting the steel pipe and the top of the steel protection cylinder by adopting a positioning bracket, and filling a bottom gap between the steel pipe and the steel protection cylinder by adopting an auxiliary device so that the steel pipe and the steel protection cylinder form a spliced structure, and the bottom end of the steel protection cylinder is lower than the bottom end of the steel pipe;
s2, integrally hoisting the assembled structure by using hoisting equipment, lowering the assembled structure according to the designed position of the steel pipe, and then lowering a drilling machine to the bottom construction surface of the steel casing along the inner part of the steel pipe;
s3, driving the drilling machine to vertically dig a construction surface downwards in a rotary mode, and controlling the steel pipe and the steel casing to synchronously sink along the vertical direction until the bottom end of the steel pipe reaches a designed elevation;
s4, taking out the drilling machine and evacuating slurry and water in the steel casing;
s5, pouring concrete to the bottom of the steel pipe to the bottom of the steel pile casing, removing the positioning support after the concrete is solidified, pulling the steel pile casing layer by layer in the vertical direction by adopting hoisting equipment, and synchronously pouring the steel pipe concrete of the corresponding layer until the steel pipe concrete pouring in all the layers is completed;
s6, adopting hoisting equipment to continuously pull up the steel casing until the steel casing is separated from the steel pipe, and simultaneously pouring the steel pipe concrete of the remaining sections.
Preferably, in the construction process of the concrete filled steel tube column, in S1, the steel tube is pretreated before the steel tube and the steel casing are assembled, and the method comprises the following steps:
s11, coaxially sleeving a pouring inner template in a steel pipe body, closing gaps between the pouring inner template and two ends of the steel pipe body, pouring pre-filled concrete between the steel pipe body and the pouring inner template, and removing the pouring inner template after the concrete is solidified to form a pre-filled steel pipe;
s12, arranging a plurality of layers of grouting holes at the lower part of the pre-filled steel tube according to the distribution condition of the construction stratum, wherein the grouting holes are in one-to-one correspondence with a plurality of strata, each layer of grouting holes comprises a plurality of grouting holes, the grouting holes are arranged at intervals along the circumferential direction of the steel tube body, and each grouting hole is communicated with the pre-filled steel tube and the steel casing.
Preferably, in the construction process of the concrete filled steel tubular column, the positioning bracket comprises a hoisting platform which is fixed on the outer side wall of the top of the steel casing; the steel pile casing lifting lug is arranged at the top of the lifting platform; the collet chuck comprises two jackets, the intrados of the collet chucks are oppositely arranged and sleeved on the outer side wall of the top of the steel pipe, the two jackets are connected through bolts and clamp the steel pipe inwards, and the steel pipe is erected on the hoisting platform through the collet chuck; the steel pipe lifting lug is arranged at the top of the collet chuck; and the positioning bolt is fixedly connected with the collet chuck and the hoisting platform.
Preferably, in the construction process of the concrete filled steel tubular column, the auxiliary device comprises a cutting edge foot, wherein the cutting edge foot is continuously arranged along the inner periphery of the steel casing and fixed at the bottom end of the steel casing, and the tip end of the cutting edge foot is vertically downwards arranged; the water stop ring is horizontally fixed at the top of the cutting edge, the outer side wall of the water stop ring is fixedly connected with the inner side wall of the steel casing, and the inner side wall of the water stop ring is abutted to the outer side wall of the steel pipe and is in sliding connection along the height direction of the steel pipe.
Preferably, in the construction process of the concrete filled steel tubular column, in S4, after the slurry and water in the steel casing are evacuated, the positioning of the steel tubular column is adjusted, and the adjustment method is as follows:
firstly, the connection of the positioning bolts to the collet chuck and the hoisting platform is released, then the hoisting equipment is used for adjusting the relative position of the collet chuck on the hoisting platform, and after the steel pipe moves to the designed position, the temporary fixing device is used for fixing the collet chuck on the hoisting platform again.
Preferably, in the construction process of the steel pipe concrete column, in S5, the number of pull-up layers and the single-layer pull-up distance of the steel casing are set according to stratum distribution and stratum thickness, and the construction method for pouring the multilayer steel pipe concrete comprises the following steps:
s51, pulling up the steel pile casing until the bottom end of the steel pile casing is flush with the current stratum surface, synchronously pouring concrete to the bottom of the steel pipe in the process of pulling up the steel pile casing, enabling the concrete in the steel pipe to enter a gap between the steel pipe and the steel pile casing through an opening on the side wall of the steel pipe and fill the gap, wherein the height position of the concrete in the steel pipe in the poured single-layer steel pipe concrete is the same as the height position of the concrete between the steel pipe and the steel pile casing;
s52, after the steel pipe concrete of the current stratum is solidified, repeating the step S51 to continue pouring the upper layer of steel pipe concrete until the pouring of the steel pipe concrete in all the strata is completed.
In the construction process of the concrete filled steel tubular column, in S51, the poured single-layer concrete filled steel tubular column is matched with the strength of the rock in the corresponding stratum.
The invention at least comprises the following beneficial effects:
1. according to the invention, the steel pile casing and the steel pipe are assembled, the integral sinking of the assembled structure is realized by synchronously digging down the steel pipe in cooperation with the drilling machine, the gap between the steel pipe and the steel pile casing is relatively closed, the sinking posture and the axis coordinate of the inner steel pipe are used as positioning references, the influence of external factors on the positioning accuracy of the steel pipe concrete column is reduced, the synchronous sinking of the steel pile casing and the steel pipe simplifies the construction process, and the construction efficiency is improved; gradually pulling out the steel casing according to the stratum structure after the steel pipe is sunk in place, and layering according to geological conditions to finish concrete pouring of the steel pipe, so that external supporting stability in the concrete pouring is guaranteed, a layered reinforcing structure connected with an external stratum is formed at the bottom of the steel pipe concrete column, and construction stability and construction quality are improved;
2. according to the invention, concrete filling is performed on the inner wall of the steel pipe in advance before assembly, so that the strength and bearing capacity of the steel pipe are improved, the steel pipe can be further protected from external impact force in the synchronous sinking process along with the steel casing, and the concrete filled in the subsequent concrete pouring process can fully fill the concrete gaps on the damaged inner wall of the steel pipe, so that the piling quality of the steel pipe concrete column is not affected.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the construction structure of S3 of the construction process of a concrete filled steel tubular column according to one embodiment of the present invention;
FIG. 2 is a schematic plan view of the assembly structure of S3 in the above embodiment;
fig. 3 is a schematic view of the construction structure of S4 in the above embodiment;
fig. 4 is a schematic view of a construction structure for pouring the bottom concrete in the above embodiment;
fig. 5 is a schematic view of a construction structure of concrete filled steel tube for casting an underwater rock layer in the above embodiment;
fig. 6 is a schematic view of a construction structure of concrete filled steel tube for casting an underwater soil layer in the above embodiment;
fig. 7 is a schematic view of the construction structure of S6 in the above embodiment.
Reference numerals illustrate:
11. a steel pipe body; 12. pre-filling concrete; 13. grouting holes; 2. a steel pile casing; 31. hoisting the platform; 32. a collet; 33. steel pile casing lifting lug; 34. a steel pipe lifting lug; 35. a bolt; 36. positioning bolts; 37. temporary fixing means; 41. a blade foot; 42. a water stop ring; 5. hoisting equipment; 6. a drilling machine; 71. bottom layer concrete; 72. single-layer steel pipe concrete; 81. an underwater rock formation; 82. an underwater soil layer; 83. the water surface.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
As shown in fig. 1 to 7, the present invention provides a concrete filled steel tubular column construction process, comprising:
s1, sleeving a steel protection cylinder 2 on the outer side of a steel pipe, fixedly connecting the steel pipe and the top of the steel protection cylinder 2 by adopting a positioning bracket, and filling a bottom gap between the steel pipe and the steel protection cylinder by adopting an auxiliary device so that the steel pipe and the steel protection cylinder form a spliced structure, and the bottom end of the steel protection cylinder is lower than the bottom end of the steel pipe;
s2, integrally lifting the assembled structure by using lifting equipment 5, lowering the assembled structure according to a designed position, and then lowering a drilling machine 5 to the construction surface at the bottom of the steel casing along the inner part of the steel pipe;
s3, driving the drilling machine 5 to vertically dig a construction surface downwards in a rotary mode, and controlling the steel pipe and the steel casing to synchronously sink along the vertical direction until the bottom end of the steel pipe reaches a designed elevation;
s4, taking out the drilling machine and evacuating slurry and water in the steel casing;
s5, pouring concrete to the bottom of the steel pipe to the bottom of the steel pile casing, removing the positioning support after the concrete is solidified, pulling the steel pile casing layer by layer in the vertical direction by adopting hoisting equipment, and synchronously pouring the steel pipe concrete of the corresponding layer until the steel pipe concrete pouring in all the layers is completed;
s6, adopting hoisting equipment to continuously pull up the steel casing until the steel casing is separated from the steel pipe, and simultaneously pouring the steel pipe concrete of the remaining sections.
In the above technical scheme, in S1, the steel pipe and the steel casing are initially assembled and connected through the positioning bracket at the top, the steel casing and the steel pipe are coaxially sleeved and are downwards arranged at a distance from one end relative to the bottom end of the steel pipe (namely, the bottom end of the steel casing is lower than the bottom end of the steel pipe), and the auxiliary device at the bottom can further fix the relative position of the steel pipe and the steel casing and form a relatively closed annular cavity between the steel pipe and the steel casing. The positioning bracket and the auxiliary device are arranged on the outer side of the steel pipe, a cavity which is penetrated up and down is formed in the steel pipe, and the drill rig in S2 is prevented from being lowered along the inner side of the steel pipe and the subsequent rotary digging construction is prevented from being influenced; the hoisting equipment is arranged on a water surface fixing structure or a temporary construction platform, the hoisting equipment can comprise a plurality of cranes, the S2 adopts a crane integral hoisting assembly structure, after sinking to a certain height (the structure cannot continue sinking by self gravity), another crane is adopted to lower the drilling machine to the bottom of the steel protection cylinder along the steel pipe (the space between the bottom of the steel protection cylinder and the bottom of the steel pipe), the drilling machine can adopt a conventional rotary drilling rig, the drill bit size of the drilling machine is adaptive to the inner diameter of the steel pipe, and the drilling machine can smoothly lower or lift the drilling machine along the inside of the steel pipe. S3, as the drilling machine is continuously dug down, the soil layer below the assembly structure is damaged, so that the assembly structure can continue to sink until the bottom end of the steel pipe reaches the designed elevation H; in the above process, the two cranes respectively control the digging speed of the drilling machine and the sinking speed of the assembly structure, so that the two cranes sink synchronously, meanwhile, the sinking posture of the assembly structure is controlled, the steel pipe and the steel pile casing are ensured to be vertically inserted into the underwater soil layer/rock stratum, in addition, the external acting force of the assembly structure is mainly applied to the outer steel pile casing in the sinking process, the internal impact force is small (mainly the acting force of the slurry floating up to the inner wall of the steel pipe brought up in the sinking process), the steel pipe and the steel pile casing are synchronously sunk at one time, the steel pipe quality is protected, the steel pipe is not easy to be damaged, and the construction quality is ensured while the construction efficiency is ensured. The rotary digging construction is provided with devices such as water injection, a slurry pump, a conveying pipeline and the like in a matching way, high-pressure water can be continuously injected to the construction surface in the rotary digging process, the construction surface is flushed and soil and crushed rock are taken away, and slurry generated in the rotary digging process is discharged through the conveying pipeline; after the drilling machine is constructed, the drilling machine is lifted by using the crane and separated from the inside of the steel pipe, the matched slurry pump and the conveying pipeline for rotary excavation construction are not removed, and in S5, reverse grouting can be continuously performed by using the conveying pipeline and the slurry pump, so that concrete pouring construction is performed. In this embodiment, the concrete filled steel tubular column construction process is applied to an underwater pile foundation construction, wherein the underwater soil layer 82 (lower in strength) is arranged in a certain depth range below the water surface 83, and the underwater rock layer 81 (higher in strength) is arranged below the underwater soil layer. Specifically, the stratum comprises two layers (an underwater soil layer and an underwater rock layer), and the steel casing is pulled up twice to perform concrete filled steel tube pouring in the stratum. In S5, pouring the bottom layer concrete 71 (namely, concrete between the bottom end of the steel casing and the bottom end of the steel pipe in the initial installation position) firstly, and when the concrete is actually poured, after filling the height gap between the bottom end of the steel casing and the bottom end of the steel pipe, pouring a section of concrete in the steel pipe upwards continuously so as to ensure the foundation positioning and fixing effect of the bottom layer concrete on the steel pipe and the underwater rock stratum. The single-layer steel pipe concrete 72 comprises concrete in a steel pipe, concrete between the steel pipe and the steel pile casing, the steel pile casing is upwards grouted from the bottom of the current steel pipe (namely the concrete plane in the steel pipe) in a single-time pulling process, and integrated pouring molding of the concrete in the steel pipe, the steel pipe and the concrete between the steel pipe and the steel pile casing in a corresponding stratum (height range) can be realized through the opening of the side wall of the steel pipe, wherein the pulling of the steel pile casing and the pouring of the concrete are synchronously carried out, and the poured concrete is filled in the gap between the original position of the steel pile casing and the stratum after the steel pile casing is pulled out, so that the supporting stability of the external environment in the concrete pouring process is ensured, the pile foundation drilling is not easy to collapse, and the current stratum and the steel pipe concrete are connected into a whole through the integrally poured concrete, so that the connection stability of the steel pipe concrete column and the lower foundation is further ensured. And S6, after the pouring of the steel pipe concrete in all the strata is completed, the steel pile casing is not required to maintain the supporting stability between the strata and the steel pipe, the steel pile casing can be directly pulled up and removed, meanwhile, the concrete in the steel pipe of the rest sections (namely the steel pipe concrete on the strata) can be continuously poured, and the construction of the single-pile steel pipe concrete column is completed after capping and solidification.
According to the invention, the steel pile casing and the steel pipe are assembled, the integral sinking of the assembled structure is realized by synchronously digging down the steel pipe in cooperation with the drilling machine, the gap between the steel pipe and the steel pile casing is relatively closed, the sinking posture and the axis coordinate of the inner steel pipe are used as positioning references, the influence of external factors on the positioning accuracy of the steel pipe concrete column is reduced, the synchronous sinking of the steel pile casing and the steel pipe simplifies the construction process, and the construction efficiency is improved; the steel pipe is sunk in place, the steel pile casing is gradually pulled out according to the stratum structure, meanwhile, steel pipe concrete pouring is completed in a layered mode according to geological conditions, external supporting stability in the concrete pouring is guaranteed, a layered reinforcing structure connected with an external stratum is formed at the bottom of the steel pipe concrete column, and construction stability and construction quality are improved.
In another technical scheme, in the construction process of the concrete filled steel tubular column, in S1, the steel tube is pretreated before the steel tube and the steel casing are assembled, and the method comprises the following steps:
s11, coaxially sleeving a pouring inner template in a steel pipe body 11, closing gaps between the pouring inner template and two ends of the steel pipe body, pouring pre-filled concrete 12 between the steel pipe body and the pouring inner template, and removing the pouring inner template after the concrete is solidified to form a pre-filled steel pipe;
s12, arranging a plurality of layers of grouting holes at the lower part of the pre-filled steel tube according to the distribution condition of the construction stratum, wherein the grouting holes are in one-to-one correspondence with a plurality of strata, each layer of grouting holes comprises a plurality of grouting holes 13 which are arranged at intervals along the circumferential direction of the steel tube body, and each grouting hole is communicated with the pre-filled steel tube and the steel casing.
According to the technical scheme, the steel pipe body is a cylindrical hollow thin-wall steel pipe, the pouring inner template is a cylindrical template with the diameter smaller than that of the steel pipe body, the cylindrical template is sleeved in the steel pipe and forms an annular cavity together with the steel pipe, the bottom end and the top end of the steel pipe body are respectively provided with a bottom die and a top die for sealing the upper end and the lower end of the annular cavity, the top die is also provided with a grouting opening and an air vent, and after pouring is completed, the pouring inner template is removed after concrete solidification, namely the pre-filled steel pipe with the inner side wall uniformly covered with a concrete layer is formed. Meanwhile, as the steel pipe concrete of the corresponding layer is pulled up in a layered manner and synchronously poured in the S5, in order to realize the integrated pouring of the single-layer steel pipe concrete, grouting holes are correspondingly formed in the steel pipe sections of the corresponding layer (the height range), a plurality of grouting holes in the same layer can be formed in the bottom of the steel pipe concrete section of the current pouring, when the steel pipe concrete of the previous layer (solidified) is poured upwards, the concrete in the steel pipe flows into the space between the steel pipe and the steel pipe through the grouting holes, and as the steel pipe is synchronously moved upwards, the concrete flowing out of the grouting holes fills the gap between the outer side of the steel pipe and the current stratum, so that the connection reliability of the bottom of the steel pipe concrete column and the stratum is further improved. The concrete filling is carried out on the inner wall of the steel pipe in advance before assembly, so that the strength and the bearing capacity of the steel pipe are improved, the steel pipe can be further protected from being influenced by external impact force in the synchronous sinking process along with the steel casing, and the concrete filled in the subsequent concrete pouring process can fully fill the concrete gaps on the damaged inner wall of the steel pipe, so that the piling quality of the steel pipe concrete column is not influenced.
In another technical scheme, in the construction process of the concrete filled steel tubular column, the positioning bracket comprises a hoisting platform 31 which is fixed on the outer side wall of the top of the steel casing; a steel casing lifting lug 33 arranged on the top of the hoisting platform; the collet 32 comprises two jackets, the intrados of which are oppositely arranged and sleeved on the outer side wall of the top of the steel pipe, the two jackets are connected through bolts 35 and clamp the steel pipe inwards, and the steel pipe is erected on the hoisting platform through the collet; a steel pipe lifting lug 34 arranged on the top of the collet; and a positioning bolt 36 fixedly connecting the collet and the hoisting platform. The positioning support is of a split structure, the collet and the hoisting platform are respectively connected with the steel pipe and the steel protection barrel, and the detachable connection of the steel pipe and the steel protection barrel can be realized by controlling the connection relation between the collet and the hoisting platform. The collet is supported at the top of the hoisting platform, corresponding vertical perforations are arranged on the collet and the hoisting platform in advance, two vertical perforations are penetrated downwards in sequence by using positioning bolts and are respectively locked from two ends, so that the relative fixation of the collet and the hoisting platform can be realized, on one hand, the relative installation position (vertical position and transverse position) of the steel pipe and the steel protection barrel can be controlled, and on the other hand, after the connection of the positioning bolts is released, the position of the collet on the hoisting platform can be adjusted, and therefore, the fine adjustment of the setting state (the verticality) and the positioning (the transverse position) of the steel pipe can be realized through the adjustment of the internal structure of the positioning bracket after the assembly structure is wholly sunk in place. The steel pile casing lifting lugs and the steel pipe lifting lugs are staggered in the plane, so that mutual interference during lifting is avoided. When the collet chuck is fixed relative to the hoisting platform, the steel pipe and the steel casing are connected into a whole, and the hoisting assembly structure can be integrally hoisted through the steel pipe lifting lug or the steel casing lifting lug; when the collet chuck is separated from the hoisting platform, the collet chuck can be quickly dismantled by removing the bolt connection between the collet chuck and the hoisting platform, and then the steel casing is independently hoisted by the steel casing lifting lugs so as to perform single-layer steel pipe concrete pouring, at the moment, the position of the steel pipe in the ground is initially stabilized after the bottom layer concrete is poured, and the support stability in water can be maintained without additional control of hoisting equipment.
In another technical scheme, in the construction process of the concrete filled steel tubular column, the auxiliary device comprises a cutting edge 41, wherein the cutting edge 41 is continuously arranged along the inner periphery of the steel casing and fixed at the bottom end of the steel casing, and the tip end of the cutting edge is vertically downwards arranged; and the water stop ring 42 is horizontally fixed at the top of the blade foot, the outer side wall of the water stop ring is fixedly connected with the inner side wall of the steel casing, and the inner side wall of the water stop ring is abutted to the outer side wall of the steel pipe and is in sliding connection along the height direction of the steel pipe. Specifically, the cutting edge foot is fixed in the bottom of steel casing along circumference, can cooperate the rig to dig the supplementary integral quick decline of group of construction and piece together the structure soon, improves the efficiency of construction. The water stop ring is fixed at the top of the cutting edge and is flush with the bottom end of the steel pipe, the steel protection barrel is filled with slurry and water in the sinking process, the water stop ring swells when meeting water, the bottom end of the steel pipe is circumferentially fixed at the bottom end, the steel pipe bottom end is prevented from shaking in the steel protection barrel in the sinking process, meanwhile, the water stop ring seals the gap between the bottom end of the steel pipe and the steel protection barrel, and a sealed pouring space can be formed below the cutting edge in the bottom concrete construction or the single-layer steel pipe concrete construction, so that the pouring and solidification of the single-layer steel pipe concrete are facilitated. In addition, the water stop ring has certain shrinkage elasticity, and after the mud and water in the steel pile casing are evacuated in S4, the position of the steel pipe in the steel pile casing is conveniently fine-tuned, and the installation quality of the steel pipe concrete column is further guaranteed.
In another technical scheme, in the construction process of the concrete filled steel tubular column, in S4, after the slurry and water in the steel casing are evacuated, the positioning of the steel tubular column is adjusted, and the adjusting method is as follows:
firstly, the connection of the collet chuck to the hoisting platform by the positioning bolts is released, then the relative position of the collet chuck on the hoisting platform is adjusted by using hoisting equipment, and after the steel pipe moves to the designed position, the collet chuck 32 is re-fixed on the hoisting platform by adopting a temporary fixing device 37. The steel pipe lifting lug on the lifting device connecting collet chuck finely adjusts the position of the steel pipe in the steel protection barrel, the collet chuck and the lifting platform are re-fixed by using a temporary fixing device after adjustment, the temporary fixing device can select a opposite-pull clamping plate, and the two clamping pieces respectively press the middle positioning bracket from the top surface of the collet chuck and the bottom surface of the lifting platform relatively, so that the collet chuck and the lifting platform are relatively fixed, and the steel pipe is prevented from being positioned to deviate in the concrete pouring process. After the connection of the positioning support is released, the steel pipe and the outer steel casing are supported in the underwater stratum relatively independently, impact force generated by the external environment mainly acts on the steel casing, and in the subsequent concrete pouring process, the construction environment of the steel pipe is stable, so that the positioning accuracy and the pouring quality of the steel pipe concrete column after pouring is further ensured.
In another technical scheme, in the construction process of the steel pipe concrete column, in S5, the number of pull-up layers and the single-layer pull-up distance of the steel casing are set according to stratum distribution and stratum thickness, and the construction method for pouring the multilayer steel pipe concrete comprises the following steps:
s51, pulling up the steel pile casing 2 until the bottom end of the steel pile casing is flush with the current stratum surface, synchronously pouring concrete to the bottom of the steel pipe in the process of pulling up the steel pile casing, enabling the concrete in the steel pipe to enter a gap between the steel pipe and the steel pile casing through a side wall opening of the steel pipe and fill the gap, wherein the height position of the concrete in the steel pipe in the poured single-layer steel pipe concrete 72 is the same as the height position of the concrete between the steel pipe and the steel pile casing;
s52, after the steel pipe concrete of the current stratum is solidified, repeating the step S51 to continue pouring the upper layer of steel pipe concrete until the pouring of the steel pipe concrete in all the strata is completed.
In this embodiment, the formation comprises two layers (underwater soil layer 82 and underwater rock layer 81), and the steel casing is pulled up twice to perform concrete filled steel tube casting in the formation. Because the bottom of the steel pile casing is pulled up to be flush with the surface of the current stratum in construction and concrete solidification is carried out at the position, after the single-layer steel pipe concrete 72 is poured, the current stratum and the steel pipe concrete column in the corresponding height range are connected into a whole, a round table-shaped reinforcing structure is formed at the joint of the bottom of the previous stratum and the steel pipe, the overall stability of supporting and connecting the steel pipe concrete column among different strata is further improved, and particularly, for unfavorable environments such as soft geological layers, the supporting stability between the reinforced steel pipe concrete column and the ground layer can be assisted by the structure, and the supporting quality of the steel pipe concrete column is prevented from being influenced by stratum change.
In another technical scheme, in the construction process of the concrete filled steel tubular column, in S51, the poured single-layer concrete filled steel tubular column is matched with the rock and soil strength in the corresponding stratum. Specifically, in this embodiment, the stratum includes the underwater rock stratum and the underwater soil layer from bottom to top, the bottom concrete and the first layer of steel pipe concrete are all poured in the underwater rock stratum, the high-performance concrete (HPC) is selected to adapt to (approach) the rock-soil strength of the underwater rock stratum, the second layer of steel pipe concrete is poured in the underground soil layer, the ordinary concrete is selected to adapt to the rock-soil strength of the underwater soil layer, and the connection integrity and stability of the steel pipe concrete column lower structure and the foundation are better. The pre-filled concrete and the steel tube concrete (the upper concrete in the steel tube) of the rest sections in the S6 can be high-performance concrete, so that the overall strength and the bearing capacity of the steel tube concrete column are improved, and the supporting stability of the steel tube concrete column in various environments is further ensured.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (5)
1. The construction process of the concrete filled steel tube column is characterized by comprising the following steps of:
s1, sleeving a steel protection cylinder on the outer side of a steel pipe, fixedly connecting the steel pipe and the top of the steel protection cylinder by adopting a positioning bracket, and filling a bottom gap between the steel pipe and the steel protection cylinder by adopting an auxiliary device so that the steel pipe and the steel protection cylinder form a spliced structure, and the bottom end of the steel protection cylinder is lower than the bottom end of the steel pipe;
the auxiliary device comprises a cutting edge foot which is continuously arranged along the inner periphery of the steel protective cylinder and fixed at the bottom end of the steel protective cylinder, and the tip end of the cutting edge foot is vertically downwards arranged; the water stop ring is horizontally fixed at the top of the cutting edge, the outer side wall of the water stop ring is fixedly connected with the inner side wall of the steel casing, and the inner side wall of the water stop ring is abutted to the outer side wall of the steel pipe and is in sliding connection along the height direction of the steel pipe;
s2, integrally hoisting the assembled structure by using hoisting equipment, lowering the assembled structure according to the designed position of the steel pipe, and then lowering a drilling machine to the bottom construction surface of the steel casing along the inner part of the steel pipe;
s3, driving the drilling machine to vertically dig a construction surface downwards in a rotary mode, and controlling the steel pipe and the steel casing to synchronously sink along the vertical direction until the bottom end of the steel pipe reaches a designed elevation;
s4, taking out the drilling machine and evacuating slurry and water in the steel casing;
s5, pouring concrete to the bottom of the steel pipe to the bottom of the steel pile casing, removing the positioning support after the concrete is solidified, pulling the steel pile casing layer by layer in the vertical direction by adopting hoisting equipment, and synchronously pouring the steel pipe concrete of the corresponding layer until the steel pipe concrete pouring in all the layers is completed; the construction method for pouring the multilayer steel pipe concrete comprises the following steps of:
s51, pulling up the steel pile casing until the bottom end of the steel pile casing is flush with the current stratum surface, synchronously pouring concrete to the bottom of the steel pipe in the process of pulling up the steel pile casing, enabling the concrete in the steel pipe to enter a gap between the steel pipe and the steel pile casing through an opening on the side wall of the steel pipe and fill the gap, wherein the height position of the concrete in the steel pipe in the poured single-layer steel pipe concrete is the same as the height position of the concrete between the steel pipe and the steel pile casing;
s52, after the steel pipe concrete of the current stratum is solidified, repeating the step S51 to continue pouring the upper layer of steel pipe concrete until the pouring of the steel pipe concrete in all the strata is completed;
s6, adopting hoisting equipment to continuously pull up the steel casing until the steel casing is separated from the steel pipe, and simultaneously pouring the steel pipe concrete of the remaining sections.
2. A concrete filled steel tubular column construction process according to claim 1, wherein in S1, the steel pipe is pretreated before being assembled with the steel casing, and the method comprises:
s11, coaxially sleeving a pouring inner template in a steel pipe body, closing gaps between the pouring inner template and two ends of the steel pipe body, pouring pre-filled concrete between the steel pipe body and the pouring inner template, and removing the pouring inner template after the concrete is solidified to form a pre-filled steel pipe;
s12, arranging a plurality of layers of grouting holes at the lower part of the pre-filled steel tube according to the distribution condition of the construction stratum, wherein the grouting holes are in one-to-one correspondence with a plurality of strata, each layer of grouting holes comprises a plurality of grouting holes, the grouting holes are arranged at intervals along the circumferential direction of the steel tube body, and each grouting hole is communicated with the pre-filled steel tube and the steel casing.
3. A concrete filled steel tubular column construction process as recited in claim 1 wherein said positioning bracket comprises a lifting platform secured to the top outer sidewall of said steel casing; the steel pile casing lifting lug is arranged at the top of the lifting platform; the collet chuck comprises two jackets, the intrados of the collet chucks are oppositely arranged and sleeved on the outer side wall of the top of the steel pipe, the two jackets are connected through bolts and clamp the steel pipe inwards, and the steel pipe is erected on the hoisting platform through the collet chuck; the steel pipe lifting lug is arranged at the top of the collet chuck; and the positioning bolt is fixedly connected with the collet chuck and the hoisting platform.
4. A steel pipe concrete column construction process according to claim 3, wherein in S4, the positioning of the steel pipe is adjusted after the slurry and water in the steel casing are evacuated, the adjustment method is:
firstly, the connection of the positioning bolts to the collet chuck and the hoisting platform is released, then the hoisting equipment is used for adjusting the relative position of the collet chuck on the hoisting platform, and after the steel pipe moves to the designed position, the temporary fixing device is used for fixing the collet chuck on the hoisting platform again.
5. A steel pipe concrete column construction process according to claim 1, wherein in S51, the poured single layer steel pipe concrete is matched with the strength of the rock in the corresponding formation.
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