阅读说明：本技术 一种桩基及其施工方法 (Pile foundation and construction method thereof ) 是由 刘瑛 王能辉 章斌智 汪鲁 李伟园 于 2020-05-29 设计创作，主要内容包括：本发明涉及一种桩基,其包括混凝土基座和固定于混凝土基座下的若干桩柱,还包括一种混凝土施工方法,其步骤为：1)、预先浇筑预制水泥筒；2)、挖桩孔；3)、桩孔中打入护筒；4)、旋转护筒,通过开槽凸起开设环槽；5)、护筒内放入预制水泥筒,拔出护筒；6)、预制水泥筒内放入钢筋笼；7)、预制水泥筒内放入钢筋架；8)、反复步骤6)和步骤7)；9)、拔出护筒后在形成的空间内浇筑水泥；10)、反复步骤1)到步骤9)浇筑多个桩柱；11)、在多个桩柱上浇筑混凝土基座；12)、振捣密实混凝土；13)、混凝土养护。本发明公开的桩基与泥土的牢固性更好,不易产生晃动、倾斜以及沉降,其施工方法适应深孔桩桩基的施工的效果。(The invention relates to a pile foundation, which comprises a concrete base and a plurality of pile columns fixed below the concrete base, and also comprises a concrete construction method, which comprises the following steps: 1) pouring a prefabricated cement cylinder in advance; 2) digging a pile hole; 3) driving a pile casing into the pile hole; 4) the rotary protective cylinder is provided with a ring groove through a slotted bulge; 5) placing a cement cylinder in the protective cylinder, and pulling out the protective cylinder; 6) placing a reinforcement cage in the prefabricated cement cylinder; 7) placing a reinforcing steel bar frame in the prefabricated cement cylinder; 8) repeating the step 6) and the step 7); 9) pouring cement in the formed space after the pile casing is pulled out; 10) repeating the steps 1) to 9) to pour a plurality of piles; 11) pouring concrete bases on the pile columns; 12) vibrating and compacting the concrete; 13) and curing the concrete. The pile foundation disclosed by the invention has better firmness with soil, is not easy to shake, incline and settle, and the construction method is suitable for the construction effect of the deep-hole pile foundation.)

1. A pile foundation, its characterized in that: the concrete pile structure comprises a concrete base (1) and a plurality of pile columns (2) fixed below the concrete base (1), wherein each pile column (2) comprises a prefabricated cement cylinder (21), a cast-in-place cement pile (22) and a cast-in-place shell (23) which are integrally fixed, the cast-in-place cement piles (22) are positioned in the prefabricated cement cylinders (21), a steel reinforcement framework is arranged in each cast-in-place cement pile (22), each steel reinforcement framework comprises a steel reinforcement cage (24) and a steel reinforcement frame (25), the steel reinforcement cages (24) and the steel reinforcement frames (25) are respectively provided with a plurality of steel reinforcement cages (24) and the steel reinforcement frames (25), and the plurality of steel reinforcement cages (24) and the plurality of steel reinforcement frames (25) are alternately arranged along the height direction of the;

the reinforcement frame (25) comprises a plurality of arc-shaped reinforcements (251), the arc-shaped reinforcements (251) are provided, one ends of the arc-shaped reinforcements (251) are fixed, the other ends of the arc-shaped reinforcements are arranged in a radiating manner towards the periphery, the side wall of the precast cement cylinder (21) is provided with through hole (211) groups for the arc-shaped reinforcements (251) to penetrate through, the through hole (211) groups are provided with a plurality of groups, the through hole (211) groups are arranged at intervals along the height direction of the precast cement cylinder (21), the through hole (211) groups comprise a plurality of through holes (211), and the through holes (211) are arranged at intervals along the circumferential direction of the precast cement cylinder (21);

the cast-in-place shell (23) is sleeved outside the prefabricated cement barrel (21), a plurality of annular limiting blocks (231) are arranged on the outer side wall of the cast-in-place shell (23), the annular limiting blocks (231) are arranged along the height direction of the cast-in-place shell (23) at intervals, and one ends, located outside the prefabricated cement barrel (21), of the arc steel bars (251) are poured in the annular limiting blocks (231).

2. The pile foundation and the construction method thereof according to claim 1, wherein: reinforcing bar cage (24) include a plurality of main muscle (241) and set up in a plurality of stirrups (242) outside a plurality of main muscle (241), and is a plurality of stirrup (242) are followed main muscle (241) length direction interval sets up, the vertical setting of main muscle (241), reinforcing bar frame (25) are adjacent space between circular arc reinforcing bar (251) sets up to pass clearance (252), just the upper and lower both ends of main muscle (241) pass adjacent respectively reinforcing bar frame (25) pass clearance (252).

3. The pile foundation and the construction method thereof according to claim 2, wherein: the arc-shaped reinforcing steel bars (251) are obliquely arranged, and one ends of the arc-shaped reinforcing steel bars (251) outside the precast cement cylinder (21) are obliquely inclined downwards.

4. A pile foundation and a construction method thereof according to claim 3, wherein: the arc-shaped reinforcing steel bars (251) are obliquely arranged, and one ends of the arc-shaped reinforcing steel bars (251) outside the precast cement cylinder (21) are obliquely upwards.

5. A pile foundation and a construction method thereof according to claim 2 or 3, wherein: the inner wall and the outer wall of the pre-made cement cylinder (21) are both provided with rough surfaces.

6. A pile foundation and a construction method thereof according to claim 5, wherein: limiting grooves (212) are formed in the inner wall of the cement making barrel (21), the limiting grooves (212) are vertically arranged and penetrate through the upper end face of the cement making barrel (21), the limiting grooves (212) are in a plurality of, the limiting grooves (212) are in one-to-one correspondence with the through holes (211), and the through holes (211) penetrate through the bottom of the limiting grooves (212).

7. A pile foundation construction method is characterized in that: the method comprises the following steps:

1) pouring a prefabricated cement cylinder (21) in advance through a template;

2) pre-digging a pile hole with a designed depth at a pile position;

3) the pile casing (3) is driven into the pile hole, wherein a plurality of slotted bulges (31) are arranged on the outer wall of the pile casing (3), the connecting line of the slotted bulges (31) is a vertical line, and the distance between every two adjacent slotted bulges (31) is consistent with the distance between every two adjacent annular limiting blocks (231);

4) rotating the protective cylinder (3), forming a ring groove through the slotted protrusion (31), and rotating the slotted protrusion (31) to an initial position;

5) placing a pre-made cement cylinder (21) in the protective cylinder (3), and pulling out the protective cylinder (3);

6) placing a reinforcement cage (24) in the prefabricated cement cylinder (21);

7) placing the reinforcing steel bar frame (25) in the prefabricated cement cylinder (21), wherein the overhanging end of the arc reinforcing steel bar (251) is bent and embedded into the corresponding limiting groove (212) in a one-to-one correspondence manner, and pushing the reinforcing steel bar frame (25) to move downwards until the arc reinforcing steel bar (251) passes through the through hole (211);

8) repeating the step 6) and the step 7) until all reinforcement cages (24) and reinforcement frames (25) are installed in the prefabricated cement barrel (21);

9) pouring cement in the space formed after the pile casing (3) is pulled out until all the ring grooves are filled;

10) repeating the steps 1) to 9) to pour a plurality of pile columns (2);

11) erecting a template and pouring a concrete base (1) on the pile columns (2);

12) vibrating and compacting the concrete;

13) and curing the concrete.

8. The pile foundation construction method according to claim 7, wherein: in the step 3), when the pile casing (3) is driven into a pile hole, the slotted protrusions (31) form a pouring channel (232) along the vertical direction, the adjacent slotted protrusions (31) are provided with stabilizing blocks (32), wherein the stabilizing blocks (32) and the slotted protrusions (31) are respectively and vertically provided with a first limiting hole (311) and a second limiting hole (321) which penetrate through the stabilizing blocks (32) and the slotted protrusions (31), and the limiting shafts (33) alternately penetrate through the first limiting holes (311) and the second limiting holes (321) which are formed in the plurality of stabilizing blocks (32) and the plurality of slotted protrusions (31) before the pile casing (3) is driven into the pile hole;

in the process of step 4), the limiting shaft (33) is pulled out, and then the protective cylinder (3) is rotated;

in the process of the step 5), before the pile casing (3) is pulled out, the limiting shaft (33) alternately penetrates through the first limiting hole (311) and the second limiting hole (321) formed in the plurality of stabilizing blocks (32) and the plurality of slotted bosses (31).

9. The pile foundation construction method according to claim 8, wherein: in the step 3), the inner diameter of the pile casing (3) is consistent with the aperture of the pile hole, and the outer ring of the lower end face of the pile casing (3) is arranged in an upward inclined manner.

10. The pile foundation construction method according to claim 9, wherein: in step 9), a pipeline for pouring cement is inserted into the bottom end of the pouring channel (232), and the cement overflows upwards to finally fill all the ring grooves.

Technical Field

The invention relates to the technical field of pile foundations, in particular to a pile foundation and a construction method thereof.

Background

Pile foundations, deep foundations consisting of piles and pile caps (simply referred to as caps) connecting the tops of the piles or mono-pile foundations connected by columns to the pile foundations, are generally used to support and fix buildings on soft ground to prevent their settlement.

Chinese patent with grant publication No. CN205134346U and application date of 2016, 4, and 6 discloses a building pile foundation structure, which comprises a foundation pile and a bearing platform, wherein the foundation pile comprises a hollow pipe made of an anti-corrosion material, a steel bar bundle is arranged inside the hollow pipe, a hollow structure is arranged between the inner surface of the hollow pipe and the steel bar bundle, a sandstone layer and a quicklime layer are arranged on the outer surface of the hollow pipe, and the quicklime layer is arranged between the sandstone layer and the outer surface of the hollow pipe; in addition, be provided with the lug on the outer wall of foundation pile, the lug is used for increasing foundation pile and soft wet earth's area of contact, makes foundation pile lifting surface area increase in earth, and is better with the fastness of earth, and difficult production rocks or inclines, and lug and foundation pile integrated into one piece set up, and the shape of lug is the radius frustum, and the lug cavity supplies the foundation pile to run through, and the axis of lug and the axis of foundation pile are on same straight line.

The pile foundation has the following defects: through the setting of lug, make foundation pile atress area increase in earth, better with the fastness of earth, difficult production rocks, slope and subsides, but in actual production work as, especially deep hole pile foundation, it all carries out concrete placement again after with steel reinforcement cage patchhole, and above-mentioned pile foundation is not suitable for.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a pile foundation which has better firmness with soil, is not easy to shake, incline and settle and is suitable for construction of a deep-hole pile foundation.

The above object of the present invention is achieved by the following technical solutions:

a pile foundation comprises a concrete base and a plurality of pile columns fixed below the concrete base, wherein each pile column comprises a prefabricated cement cylinder, a cast-in-place cement pile and a cast-in-place shell which are integrally fixed, each cast-in-place cement pile is positioned in the prefabricated cement cylinder, a steel reinforcement framework is arranged in each cast-in-place cement pile, each steel reinforcement framework comprises a steel reinforcement cage and a steel reinforcement frame, the steel reinforcement cages and the steel reinforcement frames are respectively provided with a plurality of steel reinforcement cages, and the plurality of steel reinforcement cages and the plurality of steel reinforcement frames are alternately arranged along the height direction of the cast-in-place cement piles;

the reinforcing steel bar frame comprises a plurality of arc reinforcing steel bars, one ends of the arc reinforcing steel bars are fixed, the other ends of the arc reinforcing steel bars are arranged in a radiating mode towards the periphery, a plurality of perforation groups for the arc reinforcing steel bars to penetrate through are arranged on the side wall of the prefabricated cement cylinder, the perforation groups comprise a plurality of perforation groups, the perforation groups are arranged at intervals along the height direction of the prefabricated cement cylinder, and the perforation groups comprise a plurality of perforations which are arranged at intervals along the circumferential direction of the prefabricated cement cylinder;

the cast-in-place shell is sleeved outside the prefabricated cement barrel, a plurality of annular limiting blocks are arranged on the outer side wall of the cast-in-place shell, the annular limiting blocks extend along the height direction of the cast-in-place shell at intervals, and one ends, located outside the prefabricated cement barrel, of the arc reinforcing steel bars are poured in the annular limiting blocks.

Through adopting the above-mentioned technical scheme, the stake is set to a prefabricated cement section of thick bamboo, cast-in-place cement stake and cast-in-place shell triplex, make things convenient for the construction and the manufacturing of stake, the intensity of stake has been strengthened to the framework of steel reinforcement in the cast-in-place cement stake, the annular stopper that sets up improves the fastness of pile foundation and earth better, make the difficult production of pile foundation rock, the slope and subside, preset the perforation that sets up on the cement section of thick bamboo, make the circular arc reinforcing bar wear out from presetting a cement section of thick bamboo, the part that the circular arc reinforcing bar wore out to preset a cement section of thick bamboo is located annular stopper, make the intensity of annular stopper higher, and then make the higher inside of each.

The present invention in a preferred example may be further configured to: the steel reinforcement cage includes a plurality of main muscle and sets up a plurality of stirrups outside a plurality of main muscle, and is a plurality of the stirrup is followed main muscle length direction interval sets up, the vertical setting of main muscle, the reinforcing bar frame is adjacent space between the circular arc reinforcing bar sets up to passing the clearance, just the upper and lower both ends of main muscle are passed respectively adjacently reinforcing bar frame pass the clearance.

By adopting the technical scheme, the ends, close to each other, of the main reinforcements of the adjacent reinforcement cages are staggered with each other, so that the strength of the cast-in-place cement pile is higher, and the main reinforcements penetrate through the gaps of the reinforcement frames, so that all parts of the reinforcement cage are mutually associated.

The present invention in a preferred example may be further configured to: the arc reinforcing steel bars are obliquely arranged, and one end of each arc reinforcing steel bar, which is positioned outside the prefabricated cement cylinder, is obliquely inclined downwards.

Through adopting above-mentioned technical scheme for the circular arc reinforcing bar can be to middle elastic deformation, makes things convenient for the installation of reinforcing bar frame, contracts the reinforcing bar frame earlier, then slides in presetting a cement section of thick bamboo through the reinforcing bar frame, when the circular arc reinforcing bar inserted in the perforation, through further removing the reinforcing bar frame, makes the circular arc reinforcing bar stretch out and better wear out from the perforation, makes things convenient for the installation of reinforcing bar frame.

The present invention in a preferred example may be further configured to: the arc reinforcing steel bars are obliquely arranged, and one ends of the arc reinforcing steel bars, which are positioned outside the prefabricated cement cylinder, are upwards inclined.

Through adopting above-mentioned technical scheme for the circular arc reinforcing bar can be to middle elastic deformation, makes things convenient for the installation of reinforcing bar frame, contracts the reinforcing bar frame earlier, then slides in presetting a cement section of thick bamboo through the reinforcing bar frame, when the circular arc reinforcing bar inserted in the perforation, through further removing the reinforcing bar frame, makes the circular arc reinforcing bar stretch out and better wear out from the perforation, makes things convenient for the installation of reinforcing bar frame.

The present invention in a preferred example may be further configured to: the inner wall and the outer wall of the cement cylinder are both rough surfaces.

By adopting the technical scheme, the preset cement cylinder can be better fixed with the prefabricated cement pile after the pouring of the cement pile and the cast-in-place shell is formed inside and outside the preset cement cylinder.

The present invention in a preferred example may be further configured to: the inner wall of the prefabricated cement barrel is provided with a limiting groove, the limiting groove is vertically arranged and penetrates through the upper end face of the prefabricated cement barrel, the limiting groove is provided with a plurality of limiting grooves, the limiting grooves correspond to the plurality of through holes one to one, and the through holes penetrate through the groove bottom of the limiting grooves.

Through adopting above-mentioned technical scheme, set up the spacing groove for the circular arc reinforcing bar of reinforcing bar frame can be better correspond with the perforation, play the effect of location, restriction circular arc reinforcing bar position makes things convenient for the installation of reinforcing bar frame.

The invention also aims to provide a pile foundation construction method which is adaptive to the construction of a deep-hole pile foundation, and meanwhile, the constructed pile foundation has better firmness with soil and is not easy to shake, incline and settle.

The second aim of the invention is realized by the following technical scheme:

a method of pile foundation construction, the method comprising the steps of:

1) pouring a prefabricated cement cylinder in advance through a template;

2) pre-digging a pile hole with a designed depth at a pile position;

3) the pile casing is driven into the pile hole, wherein the outer wall of the pile casing is provided with a plurality of slotted bulges, the connecting line of the slotted bulges is a vertical line, and the distance between every two adjacent slotted bulges is consistent with the distance between every two adjacent annular limiting blocks;

4) rotating the protective cylinder, forming a ring groove through the slotted bulge, and rotating the slotted bulge to an initial position;

5) placing a cement cylinder in the protective cylinder, and pulling out the protective cylinder;

6) placing a reinforcement cage in the prefabricated cement cylinder;

7) placing a reinforcing steel bar frame in the prefabricated cement cylinder, wherein one overhanging end of each circular arc reinforcing steel bar is bent and embedded into the corresponding limiting groove in a one-to-one correspondence manner, and pushing the reinforcing steel bar frame to move downwards until the circular arc reinforcing steel bars pass through the through holes;

8) repeating the step 6) and the step 7) until all reinforcement cages and reinforcement frames are installed in the prefabricated cement cylinder;

9) pouring cement in the space formed after the pile casing is pulled out until all the ring grooves are filled;

10) pouring a plurality of piles by repeating the steps 1) to 9);

11) erecting a template on the plurality of pile columns and pouring a concrete base;

12) vibrating and compacting the concrete;

13) and curing the concrete.

By adopting the technical scheme, the pile casing is placed in through the prefabricated cement cylinder, the annular groove is formed through the pile casing, so that the cast-in-place cement pile and the cast-in-place shell can be formed through pouring, the cast-in-place cement pile and the cast-in-place shell and the prefabricated cement cylinder are poured and fixed into a whole, the pile is formed, a plurality of piles are constructed in the same mode, and finally, the concrete base is poured out, so that the pile is adaptive to the construction of the deep hole pile foundation.

The present invention in a preferred example may be further configured to: in the process of step 3), when the pile casing is driven into the pile hole, the slotted bulges form a pouring channel along the vertical direction, the adjacent slotted bulges are provided with stabilizing blocks, wherein the stabilizing blocks and the slotted bulges are respectively vertically provided with a first limiting hole and a second limiting hole which penetrate through the stabilizing blocks and the slotted bulges, and the stabilizing blocks and the slotted bulges alternately penetrate through the first limiting holes and the second limiting holes which are formed in the plurality of stabilizing blocks and the plurality of slotted bulges through a limiting shaft before the pile casing is driven into the pile hole;

in the process of step 4), pulling out the limiting shaft, and then rotating the protective cylinder;

and 5) before the protective cylinder is pulled out, the limiting shaft alternately penetrates through the first limiting hole and the second limiting hole formed in the plurality of stabilizing blocks and the plurality of slotted bulges again.

Through adopting above-mentioned technical scheme, it is rotatory together to drive the fluting arch through protecting a section of thick bamboo rotation, offer out the annular through the fluting arch for pour annular stopper, simultaneously through spacing fixed stable piece of axle, the stable piece is used for steadily pouring the way, take out spacing axle, when making protecting a section of thick bamboo rotation, the stable piece does not receive to protect a section of thick bamboo to drive to be located and pours and say and play the stabilizing effect, after the annular is offered and is finished, through spacing fixed stable piece of axle, make the stable piece can extract along with protecting a section of thick bamboo together.

The present invention in a preferred example may be further configured to: in the step 3), the inner diameter of the pile casing is consistent with the aperture of the pile hole, and the outer ring of the lower end face of the pile casing is arranged in an upward inclined manner.

Through adopting above-mentioned technical scheme for can extrude the pore wall in stake hole when protecting a section of thick bamboo and pushing down, play the effect of compaction, make the earth of stake hole pore wall more stable be difficult to sink, the annular of seting up out is more stable, protects a lower terminal surface and plays guide effect, better compaction earth under the section of thick bamboo.

The present invention in a preferred example may be further configured to: in step 9), a pipeline for pouring cement is inserted into the bottom end of the pouring channel, and the cement overflows upwards to finally fill all the ring grooves.

Through adopting above-mentioned technical scheme, the mode of cement excessive filling is compared in direct watering, is difficult to destroy the downthehole earth structure of stake for annular protruding forming process is more stable.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the pile column is arranged into a prefabricated cement cylinder, a cast-in-place cement pile and a cast-in-place shell, construction and manufacturing of the pile column are facilitated, the strength of the pile column is enhanced through a steel reinforcement framework in the cast-in-place cement pile, the firmness of the pile column and soil is improved through the arranged annular limiting blocks, the pile column is not prone to shaking, inclining and settling, through holes formed in the cement cylinder are preset, arc steel bars can penetrate out of the preset cement cylinder, the part, penetrating out of the preset cement cylinder, of each arc steel bar is located in the annular limiting blocks, the strength of the annular limiting blocks is higher, and the connecting strength of each part of the pile column is higher, and the steel bars are connected with one another;

2. the pile casing is placed through the prefabricated cement cylinder, the annular groove is formed through the pile casing, therefore, a cast-in-place cement pile and a cast-in-place shell can be formed through pouring, the cast-in-place cement pile and the cast-in-place shell and the prefabricated cement cylinder are poured and fixed into a whole, the pile is formed, a plurality of piles are constructed in the same mode, and finally, a concrete base is poured out, and the pile is adaptive to construction of a deep hole pile foundation.

Drawings

FIG. 1 is a schematic view 1 of the structure of example 1;

FIG. 2 is a schematic structural view 2 of example 1, showing a state where a concrete foundation is not cast;

FIG. 3 is a schematic view showing the construction of a pile in example 1, with a cast-in-place cement pile not shown;

fig. 4 is a cross-sectional view of a pile in example 1, with a cast-in-place cement pile not shown;

FIG. 5 is a schematic structural view of the reinforcement cage according to embodiment 1;

fig. 6 is a schematic structural view of a reinforcing cage in embodiment 1;

fig. 7 is a cross-sectional view of a pile in example 2, with a cast-in-place cement pile not shown;

FIG. 8 is a schematic structural view of the casing;

FIG. 9 is a partial schematic view of an exploded view of the sheath;

fig. 10 is a partial schematic view of the mounting sleeve.

In the figure, 1, a concrete base; 11. a base stirrup; 12. reinforcing ribs; 13. connecting the main ribs; 2. pile columns; 21. preparing a cement barrel; 211. perforating; 212. a limiting groove; 22. pouring a cement pile in situ; 23. casting a shell in situ; 231. an annular stop block; 232. pouring a road; 24. a reinforcement cage; 241. a main rib; 242. hooping; 25. a reinforcing steel bar frame; 251. arc steel bars; 252. passing through the gap; 3. protecting the cylinder; 31. grooving a bulge; 311. a first limit hole; 312. grooving blades; 32. a stabilizing block; 321. a second limiting hole; 33. a limiting shaft; 34. a push rod; 4. installing a sleeve; 41. a card slot; 42. a limiting bulge; 43. and (6) positioning a groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.