CN108316290B - One-column one-pile structure without bearing platform and construction method thereof - Google Patents
One-column one-pile structure without bearing platform and construction method thereof Download PDFInfo
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- CN108316290B CN108316290B CN201810298414.5A CN201810298414A CN108316290B CN 108316290 B CN108316290 B CN 108316290B CN 201810298414 A CN201810298414 A CN 201810298414A CN 108316290 B CN108316290 B CN 108316290B
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- 238000010276 construction Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 273
- 239000010959 steel Substances 0.000 claims abstract description 273
- 239000002689 soil Substances 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims abstract description 18
- 238000009412 basement excavation Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
Abstract
The invention relates to a pile-column-pile structure without a bearing platform, which comprises pile foundations, upright posts and a steel pile casing, wherein the steel pile casing is partially inserted below the ground and is partially positioned above the ground, the pile foundations are cast and formed in the steel pile casing, the upright posts are provided with outer steel pipes, and the outer steel pipes are welded at the top ends of the steel pile casings. In addition, the construction method of the structure comprises the following steps: s1, a steel pile casing is beaten into soil to a preset depth; s2, pouring pile foundations in the steel pile casing; s3, aligning the outer steel pipe with the steel casing, and welding and connecting the outer steel pipe with the steel casing. The pile foundation is directly poured in the steel pile casing, the steel pile casing and the column base are combined, the steel pile casing is not required to be pulled out, and the disturbance to the surrounding soil is small; the steel pile casing is welded with the upright post steel outer pipe, so that the pile cap is not required to be excavated on the basis of ensuring the structural strength, the disturbance to surrounding soil is small, and the defects that the pile cap excavation in the prior art has large disturbance to the soil and the pile diameter needs to be enlarged are effectively overcome.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and relates to a one-column one-pile structure without a bearing platform and a construction method thereof, which are suitable for new construction and extension projects of construction structures needing protection, such as important buildings, cultural relic protection buildings, railway lines, subway lines and the like, and are also suitable for other projects needing to reduce disturbance to soil bodies during construction.
Background
At present, there are two main modes, namely a mode of adopting a single pile cap and a mode of inserting pile heads into steel columns, and the pile forming needs to firstly lower a steel pile casing.
1. By means of single pile cap
The method for adopting the single pile cap comprises the steps of firstly, drilling a steel pile casing, then, extracting the steel pile casing after piling, then, excavating soil around the pile cap, and supporting a mould to pour the pile cap. Since the specifications prescribe that the depth of the steel column inserted into the bearing platform must reach 2.5D, D is the diameter or the length of the long side of the steel column, and the height of the bearing platform is generally higher. At the moment, the verticality adjustment mode of the steel column is mainly adjusted by a method of embedding column foot bolts below a bearing platform, and the bearing platform needs to be poured twice. The disadvantages of this approach are:
1) The bearing platform is higher, and the excavation depth is deeper, generally 2 to 3m. The excavation is deeper, and the disturbance to the peripheral soil body is larger;
2) In order to meet the requirements of the pile edge distance, the section size of the bearing platform is larger, and taking a 1m diameter pile as an example, the section size of the bearing platform is 2m multiplied by 2m. The excavation range is larger, and the disturbance to the peripheral soil body is larger;
3) The larger pile head needs to be chiseled off, and the construction speed is slower;
4) The steel pile casing needs to be pulled out, and the soil body is greatly disturbed in the pulling-out process.
2. Method for inserting pile head into steel column
The method for inserting the pile head into the steel column is also to firstly lower the steel pile casing, pour the pile top by using retarded concrete, then insert the steel column welded with the stud into the pile top and adjust the perpendicularity, and the method has the defects that:
1) The diameter of the pile is required to be at least 400mm larger than the long side of the steel column, and the pile is not applicable when the section size of the steel column is larger;
2) The larger pile diameter causes that the center distance between the pile and the existing pile is not easy to meet the requirement of 3 times of pile diameter specified by the specification;
3) The verticality adjustment precision of the steel column is poor, and additional measures for fixing the steel column, such as a ground fixing frame, are needed;
4) And if the foundation pile concrete does not reach the specified strength and does not meet the detection conditions, the steel column is required to be installed, and if the foundation pile is unqualified in detection, the steel column and the foundation pile are used as a waste together.
In summary, for new construction and reconstruction projects of construction structures needing protection, such as important buildings, cultural relics, railway lines, subway lines and the like, the two current pile foundation construction methods commonly used at present have the defects that disturbance of pile foundation excavation to soil body is unacceptable when the protection requirement is high when a pile cap is used, pile diameter expansion is required when a pile head is inserted into a steel column, and the pile diameter is unacceptable when the distance is not 3 times of the pile diameter.
Therefore, for new construction and expansion projects of construction structures needing to be protected, such as important buildings, cultural relic protection buildings, railway lines, subway lines and the like, the pile foundation construction and steel column foot manufacturing method which has little disturbance to surrounding soil bodies and low requirement on pile diameter and can accurately adjust column verticality is found to be a problem to be solved in the engineering practice.
Disclosure of Invention
The embodiment of the invention relates to a one-column one-pile structure without a bearing platform and a construction method thereof, which at least can solve part of defects in the prior art.
The embodiment of the invention relates to a pile-column-pile structure without a bearing platform, which comprises pile foundations and upright columns, and further comprises steel pile casings, wherein the steel pile casings are partially inserted below the ground and partially positioned above the ground, the pile foundations are cast and formed in the steel pile casings, the upright columns are provided with outer steel pipes, and the outer steel pipes are welded at the top ends of the steel pile casings.
As one of the embodiments, the outer steel pipe and the steel casing have the same cross section in shape and dimension, and the outer steel pipe and the steel casing are connected in butt welding;
or the outer steel pipe and the steel casing have cross sections with different shapes and/or sizes, and the outer steel pipe and the steel casing are welded and connected through a conversion node.
As one of the embodiments, the inner wall of the top of the steel casing is provided with an inner cylinder, and the top end of the inner cylinder extends into the outer steel pipe and abuts against the inner wall of the outer steel pipe.
As one of the embodiments, an inner ring plate is welded in the outer steel pipe, and the inner ring plate is supported at the top end of the inner cylinder.
As one embodiment, the steel casing is provided with a plurality of first shear studs on at least the top inner wall thereof.
As one of the embodiments, the upright is a steel column, a plurality of second shear studs are arranged on the inner wall of the bottom of the steel column, and concrete is poured into the steel column to cover each second shear stud.
The embodiment of the invention also relates to a construction method of the one-column one-pile structure without the bearing platform, which comprises the following steps:
s1, a steel pile casing is beaten into soil to a preset depth;
s2, pouring pile foundations in the steel pile casing;
s3, enabling the outer steel pipe and the steel casing to be aligned, and performing welding connection of the outer steel pipe and the steel casing.
In S2, after pile foundation pouring is completed, a concrete chiseling groove is formed on the pile top by chiseling;
s3, pouring concrete in the outer steel pipe after the outer steel pipe is welded with the steel casing; when the upright post is a steel pipe concrete column, concrete is poured in the outer steel pipe in the whole length; when the upright post is a steel post, a plurality of second shear studs are arranged on the inner wall of the bottom of the outer steel pipe, and concrete in the outer steel pipe covers each second shear stud.
As one of the embodiments, S2 specifically includes:
forming pile holes in the steel pile casing through a mud wall-protecting drilling machine, and cleaning pile bottom sediments;
lowering a reinforcement cage into the pile hole and fixing, and welding a plurality of first shear studs in the steel casing by using a stud machine;
and pouring concrete, wherein the condition of stopping pouring is to ensure that all slurry in the pile hole overflows from the steel casing and the concrete slurry overflows from the steel casing is not less than 1 cubic meter.
As one of the embodiments, in S3, a plurality of ear plates are respectively provided on the outer wall of the steel casing and the outer wall of the outer steel pipe in advance, and the verticality of the outer steel pipe is adjusted by using the ear plates.
The embodiment of the invention has at least the following beneficial effects:
(1) The pile foundation is directly poured in the steel pile casing, the steel pile casing and the column base are combined, the steel pile casing is not required to be pulled out, and the disturbance to the surrounding soil is small;
(2) The pile foundation is connected with the pile foundation by adopting a mode of welding the steel pile casing and the steel outer pipe of the pile foundation, the pile foundation is not required to be excavated on the basis of ensuring the structural strength, the disturbance to surrounding soil is small, the negligible degree can be reached, and the defects that the pile foundation is excavated to the soil greatly and the pile diameter is required to be enlarged in the prior art are effectively overcome.
The construction method provided by the invention adopts mature construction technology in the whole construction process, has better universal applicability and controllable quality of each step in the whole construction process.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a construction structure of a pile-on-column structure without a bearing platform according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is an enlarged schematic view of the portion I in fig. 1.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, an embodiment of the present invention provides a pile-column-pile structure without a bearing platform, which includes a pile foundation 13, a column and a steel casing 2, wherein the pile foundation 13 is cast and formed in the steel casing 2, that is, the steel casing 2 is sleeved outside the pile foundation 13, the steel casing 2 is partially inserted below the ground and partially located above the ground, the column has an outer steel pipe 1, and the outer steel pipe 1 is welded to the top end of the steel casing 2. The structural relationship between the pile foundation 13 and the steel pile casing 2 is that the pile foundation 13 is directly poured in the steel pile casing 2 after the steel pile casing 2 is driven into the soil and a pile hole is formed by excavation; in this way, the hoop effect between the steel casing 2 and the pile foundation 13 can ensure that the pile foundation 13 and the steel casing 2 are stressed together when the pile foundation 13 is pressed. The upright post may be a steel column or a steel pipe concrete column, and when the upright post is a steel column, the outer steel pipe 1 is the steel column itself, and when the upright post is a steel pipe concrete column, the outer steel pipe 1 is a steel pipe.
The one-column one-pile structure provided by the embodiment has at least the following beneficial effects:
(1) The pile foundation 13 is directly poured into the steel pile casing 2, the steel pile casing 2 and the column base are combined, the steel pile casing 2 does not need to be pulled out, and the disturbance to the surrounding soil is small;
(2) The steel pile casing 2 and the steel outer pipe of the upright post are welded to realize connection of the upright post and the pile foundation 13, so that on the basis of ensuring structural strength, a bearing platform is not required to be excavated, disturbance to surrounding soil is small, negligible degree can be achieved, and the defects that the disturbance to the soil caused by bearing platform excavation in the prior art is large and the pile diameter needs to be enlarged are effectively overcome.
Preferably, since the steel casing 2 is directly inserted into the soil body as a permanent structure, at least the portion thereof inserted into the soil body is subjected to corrosion-preventing treatment, that is, includes the corrosion-preventing outer layer 17, to improve the service life thereof; it is further preferable to perform corrosion protection treatment on the entire length of the steel casing 2. Wherein the preferred preservation method is as follows: sequentially applying basic anticorrosion primer, intermediate paint and glass fiber anticorrosion layer on the outer wall of the steel casing 2; of course, the present invention is not limited to the anticorrosion structure, and those skilled in the art can adjust the anticorrosion structure according to factors such as actual site conditions.
In the one-column one-pile structure, it is preferable that the outer steel pipe 1 and the steel casing 2 have cross sections having the same shape and dimension, and the outer steel pipe 1 and the steel casing 2 may be directly butt-welded. The steel casing 2 is generally cylindrical (although other shapes are certainly not excluded), and for the preferred embodiment described above, the outer steel tube 1 is also cylindrical and has the same diameter as the steel casing 2. Of course, the cross section of the upright post can also be square or other shapes, and in the case that the outer steel pipe 1 and the steel casing 2 have cross sections with different shapes and/or sizes, for example, the outer steel pipe 1 is also cylindrical but has different diameters from the steel casing 2, or the outer steel pipe 1 is square, and the outer steel pipe 1 and the steel casing 2 are connected through a conversion node in a welding way; the conversion node can be a node from a square section to a round section, or a node from a small diameter to a large diameter, and the like, and can be determined according to practical conditions, and can be processed offline, such as being welded at the bottom of the outer steel pipe 1 in advance or being integrally formed with the outer steel pipe 1, and then being welded with the steel casing 2; that is, for this case, the column comprises a transition node at the bottom of the outer steel pipe 1 that fits into the steel casing 2. Therefore, the one-column one-pile structure provided by the embodiment has good adaptability to the section of the upright post, and can be suitable for the working condition with larger section size of the upright post.
The length of the steel casing 2 is determined according to the range of the building to be protected, the soil condition, etc., and is generally not less than 3m. Preferably, the height of the steel casing 2 exposed to the ground is 0.8-1.5 m, more preferably 1m, so that the structural strength is ensured and the operation is convenient. In addition, as shown in fig. 1, the groove treatment 11 is arranged at the bottom end of the steel casing 2 so as to facilitate the steel casing 2 to be driven into a soil layer.
In the above embodiment, the steel casing 2 is welded and fixed with the outer steel pipe 1, and it is also used as the column base, obviously, the steel casing 2 and the column are connected with each other with equal strength due to the fact that the section is not weakened, so that the requirements of the relevant specifications on the column base are met.
Further preferably, as shown in fig. 1, an inner cylinder 3 is disposed on the inner wall of the top of the steel casing 2, and the top end of the inner cylinder 3 extends into the outer steel pipe 1 and abuts against the inner wall of the outer steel pipe 1. The inner cylinder 3 is preferably welded on the steel casing 2, during construction, the outer steel pipe 1 is sleeved into the inner cylinder 3, the inner cylinder 3 can be propped against the inner wall of a steel column/conversion node, the inner cylinder 3 can be used for temporary radial limiting when the outer steel pipe 1 is installed, alignment and construction between the outer steel pipe 1 and the steel casing 2 are facilitated, and on the other hand, the inner cylinder 3 can be used as a welding seam baffle when the outer steel pipe 1 and the steel casing 2 are welded.
Further preferably, as shown in fig. 1, an inner ring plate 8 is welded in the outer steel pipe 1, and the inner ring plate 8 is supported on the top end of the inner cylinder 3. As can be easily understood, the inner ring plate 8 is an annular plate body, the middle hole of the inner ring plate 8 can be used for allowing concrete to pass through, and when the upright post is a steel pipe concrete column, the middle hole of the inner ring plate 8 is larger, so that concrete pouring is facilitated; the plate surface is in a horizontal direction, is preferably arranged coaxially with the outer steel pipe 1, and is preferably welded inside the outer steel pipe 1 by adopting a fillet weld or a groove weld. The function of the inner ring plate 8 includes: the inner ring plate 8 can be matched with the inner cylinder 3, and can be temporarily supported at the top of the inner cylinder 3 when the outer steel pipe 1 is installed, so that the outer steel pipe 1 can be temporarily axially limited, and the alignment and construction between the outer steel pipe 1 and the steel casing 2 are facilitated; on the other hand, when the outer steel pipe 1 is welded with the steel casing 2, it can restrict the overall deformation of the outer steel pipe 1, thereby improving the connection accuracy of the outer steel pipe 1 and the steel casing 2.
As a preferred structure of the pile-on-pile structure without the bearing platform provided in this embodiment, as shown in fig. 1 and 2, a plurality of first shear studs 10 are disposed in the steel casing 2 at least on the top inner wall thereof. The hoop effect between the steel casing 2 and pile foundation 13 concrete poured in the steel casing 2 can ensure the cooperative stress of the steel casing 2 and the pile foundation 13 concrete, and the effect of the cooperative stress between the steel casing 2 and the pile foundation 13 concrete can be further improved by further arranging the first shear stud 10 in the steel casing 2. Obviously, the greater the number of first shear studs 10, the better the effect; from the viewpoint of convenient construction, each first shear pin 10 can be arranged within the range of 1m downwards from the top end of the steel casing 2; preferably, as shown in fig. 2, the shear layer is designed in a multi-turn manner from top to bottom, and each turn of the shear layer comprises a plurality of first shear studs 10 which are annularly arranged along the circumference of the inner wall of the steel casing 2, so that the cooperative stress effect between the steel casing 2 and the concrete is better.
Likewise, it is preferable to provide a plurality of second shear studs 9 on the inner wall of the outer steel pipe 1, and the above technical effects can be obtained as well; the arrangement of the second shear pin 9 is referred to the arrangement of the first shear pin 10. For the case that the upright post is a steel pipe concrete column, the second shear pin 9 can be arranged on the inner wall of the outer steel pipe 1 in the whole length, and the second shear pin 9 can be arranged only in the range of 1m above the bottom of the outer steel pipe 1; for the condition that the upright post is a steel column, the second shear stud 9 is not required to be arranged, the second shear stud 9 is preferably arranged, concrete is poured in the range where the second shear stud 9 is arranged, and the strength and the reliability of the connecting structure of the upright post and the pile foundation 13 can be improved.
The embodiment of the invention also relates to a construction method of the one-column one-pile structure without the bearing platform, which comprises the following steps:
s1, driving a steel pile casing 2 into soil to a preset depth;
s2, pile foundations 13 are poured into the steel casing 2;
and S3, aligning the outer steel pipe 1 with the steel casing 2, and performing welding connection of the outer steel pipe 1 and the steel casing 2.
Wherein:
in S1, as shown in fig. 1, for convenience of construction, a striking table is provided on the outer wall of the steel casing 2, and a striking cylinder 7 is mounted on the striking table for completing the operation of driving the steel casing 2 and ensuring that the steel casing 2 is not deformed. The striking table comprises a striking table panel 4 and striking table stiffening ribs 5, wherein the striking table panel 4 is horizontally arranged and welded with the outer wall of the steel casing 2 (preferably double-sided fillet welding), and the striking table stiffening ribs 5 are respectively welded with the outer wall of the steel casing 2 and the striking table panel 4 (preferably double-sided fillet welding); as shown in fig. 2, the striking deck plate 4 is preferably an annular plate mounted around the outer wall of the steel casing 2; the striking cylinder 7 is preferably spot welded to the striking deck plate 4, which is arranged coaxially with the steel casing 2 and has a diameter greater than the diameter of the steel casing 2. The striking table can uniformly transmit the force of the striking cylinder 7 to the steel casing 2, so that the steel casing 2 is prevented from deforming to influence the welding precision of the subsequent steel pipe and the outer steel pipe 1. Specifically, the striking plate 4, the striking plate stiffener 5, and the inner tube 3 are preferably mounted on the steel casing 2 in advance; after the pile position is accurately lofted on site, a striking cylinder 7 is installed, the steel pile casing 2 is driven into soil to a preset depth, and the horizontal position and the inclination of the steel pile casing 2 are controlled during construction.
The pile foundation 13 comprises a reinforcement cage and concrete, and the reinforcement cage is preferably processed on site; s2, specifically comprising the following steps:
(1) After the steel pile casing 2 is driven in, forming pile holes in the steel pile casing 2 through a mud wall protection drilling machine, and cleaning pile bottom sediments, wherein the construction process is controlled according to relevant specifications;
(2) Lowering and fixing the reinforcement cage into the pile hole, wherein the pile top elevation of the reinforcement cage is preferably flush with the ground line 18; welding a plurality of first shear studs 10 in the steel casing 2 by using a stud machine, wherein a reliable temporary stepping platform is required to be manufactured during welding;
(3) And pouring concrete, wherein the condition of stopping pouring is to ensure that all slurry in the pile hole overflows from the steel casing 2 and the concrete slurry overflowed from the steel casing 2 is not less than 1 cubic meter so as to ensure the pouring quality of pile head concrete.
Further preferably, the sounding integrity detection is carried out on the pile body concrete after the concrete reaches 80% of strength, and after the detection is qualified, the pile top (the pile top 14 before chiseling is shown in fig. 1) is chiseled to form a concrete chiseled groove 15, and the concrete interfacial agent is chiseled and coated, so that the subsequent concrete pouring in the upright column is facilitated, and the connection structure strength of the upright column and the pile foundation 13 can be improved. As shown in fig. 1, the concrete pick groove 15 is preferably in a reverse conical shape, which is more effective.
In S3, the inner ring plate 8, the second shear pin 9, and the like are preferably attached to the outer steel pipe 1 in advance; in an on-line factory, the outer steel pipe 1 and the steel casing 2 are preferably pre-assembled to ensure no problem in site installation. The full penetration groove weld joint 12 is preferably arranged between the outer steel pipe 1 and the steel casing 2, the grade of the weld joint is not less than two grades, the quality of the weld joint 12 can be ensured through ultrasonic flaw detection, and the weld joint repair can be carried out when flaw detection is unqualified. Preferably, a plurality of ear plates 6 are respectively arranged on the outer wall of the steel casing 2 and the outer wall of the outer steel pipe 1 in advance, and the verticality of the outer steel pipe 1 is adjusted by adopting the ear plates 6; through foretell inner tube 3, interior annular plate 8 and otic placode 6, position, the straightness etc. of outer steel pipe 1 are adjusted accurately, realize that steel protects a section of thick bamboo 2 and outer steel pipe 1' S accurate counterpoint, guarantee connection quality, after the adjustment is accomplished, screw up the bolt of otic placode 6 in order to fix outer steel pipe 1, can carry out the welding between outer steel pipe 1 and the steel section of thick bamboo 2 after retest is qualified (when welding first shear stud 10 in S2, this steel protects the otic placode 6 on the section of thick bamboo 2 still can be used to tie the safety belt). After the outer steel pipe 1 and the steel casing 2 are welded, each ear plate 6, the striking table top plate 4 and the striking table stiffening rib 5 are removed. The adjustment of the perpendicularity by the ear plates 6 is a common method in steel construction engineering and will not be described here in detail.
Further, after the outer steel pipe 1 is welded with the steel casing 2, concrete is poured into the outer steel pipe 1; when the upright post is a steel pipe concrete column, concrete is poured in the whole length of the outer steel pipe 1; when the upright is a steel column, a plurality of second shear studs 9 are arranged on the inner wall of the bottom of the outer steel pipe 1, and concrete in the outer steel pipe 1 is covered by the second shear studs 9.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. A post-pile structure without bearing platform comprises pile foundations and upright posts, and is characterized in that: the pile foundation pouring structure comprises a pile foundation, a pile foundation and a steel casing, wherein the pile foundation is formed in the pile foundation, the pile foundation is provided with an outer steel pipe, and the outer steel pipe is welded at the top end of the steel casing;
the structural relationship between the pile foundation and the steel casing is: the steel pile casing is used as a column foot, the steel pile casing is driven into the soil and a pile hole is formed in the steel pile casing by excavation, a pile foundation is directly poured in the steel pile casing, and the pile foundation and the steel pile casing are jointly stressed when the pile foundation is stressed by the hooping effect between the steel pile casing and the pile foundation;
the outer steel pipe and the steel casing have cross sections with the same shape and size, and are in butt welding connection; or the outer steel pipe and the steel casing have cross sections with different shapes and/or sizes, and the outer steel pipe and the steel casing are welded and connected through a conversion node;
an inner cylinder is arranged on the inner wall of the top of the steel casing, and the top end of the inner cylinder extends into the outer steel pipe and abuts against the inner wall of the outer steel pipe;
an inner ring plate is welded in the outer steel pipe and is supported at the top end of the inner cylinder;
a plurality of first shear studs are arranged in the steel casing at least on the inner wall of the top of the steel casing;
the stand is the steel column, be provided with a plurality of second shear studs on the steel column bottom inner wall and in the steel column pouring concrete in order to cover each second shear stud.
2. The method of constructing a pile-on-column structure without a deck according to claim 1, comprising the steps of:
s1, a steel pile casing is beaten into soil to a preset depth;
s2, pouring pile foundations in the steel pile casing;
s3, aligning the outer steel pipe with the steel casing, and performing welding connection of the outer steel pipe and the steel casing;
s2, after pile foundation pouring is completed, chiseling the pile top to form a concrete chiseling groove;
s3, pouring concrete in the outer steel pipe after the outer steel pipe is welded with the steel casing; the inner wall of the bottom of the outer steel pipe is provided with a plurality of second shear studs, and concrete in the outer steel pipe covers each second shear stud;
s2, specifically comprises the following steps:
forming pile holes in the steel pile casing through a mud wall-protecting drilling machine, and cleaning pile bottom sediments;
lowering a reinforcement cage into the pile hole and fixing, and welding a plurality of first shear studs in the steel casing by using a stud machine;
and pouring concrete, wherein the condition of stopping pouring is to ensure that all slurry in the pile hole overflows from the steel casing and the concrete slurry overflows from the steel casing is not less than 1 cubic meter.
3. The construction method according to claim 2, wherein: and S3, arranging a plurality of lug plates on the outer wall of the steel casing and the outer wall of the outer steel pipe in advance, and adjusting the verticality of the outer steel pipe by adopting the lug plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810298414.5A CN108316290B (en) | 2018-03-30 | 2018-03-30 | One-column one-pile structure without bearing platform and construction method thereof |
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| CN201810298414.5A CN108316290B (en) | 2018-03-30 | 2018-03-30 | One-column one-pile structure without bearing platform and construction method thereof |
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| CN108316290B true CN108316290B (en) | 2024-01-23 |
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| CN110005135B (en) * | 2019-04-30 | 2023-06-06 | 广东铝遊家科技有限公司 | Multi-layer modularized house support column connection structure and connection method |
| CN111677285A (en) * | 2020-06-20 | 2020-09-18 | 中铁十九局集团第一工程有限公司 | Bridge pier column concrete conduit method pouring construction process |
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| CN108316290A (en) | 2018-07-24 |
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