CN217601402U - Miniature steel pipe pile for reinforcing foundation - Google Patents
Miniature steel pipe pile for reinforcing foundation Download PDFInfo
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- CN217601402U CN217601402U CN202123428173.8U CN202123428173U CN217601402U CN 217601402 U CN217601402 U CN 217601402U CN 202123428173 U CN202123428173 U CN 202123428173U CN 217601402 U CN217601402 U CN 217601402U
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Abstract
The utility model provides a miniature steel pipe pile for reinforcing foundation, which comprises a plurality of spliced pipe bodies, at least two grouting pipes are arranged in the pipe bodies and are used for grouting into the pipe bodies; the grouting reinforcement structure is characterized in that a pile head is arranged at one end of the pipe body, a grout stopping section and a grouting section are sequentially arranged on one side, away from the pile head, of the pipe body, the grout stopping section is not provided with a hole, and the grouting section is provided with a grouting hole and is used for grouting reinforcement. The utility model has the advantages that the miniature steel pipe piles can be flexibly arranged according to the distribution condition of the ground karst caves, the reinforcement has pertinence, and the precise reinforcement is realized; the foundation stabilization technology of the miniature steel pipe pile adopts finished small-diameter steel pipes to perform grouting reinforcement treatment on the foundation karst caves, and has the advantages of simple structure, clear working procedures, convenient construction and easy quality control; the bearing capacity of the miniature steel pipe pile is detected by a high-strain detection method, and the detection shows that the bearing capacity of the miniature steel pipe pile is strong in compression resistance and good in reinforcing effect, and the bearing capacity of the platform ring beam foundation is comprehensively improved.
Description
Technical Field
The utility model belongs to the building engineering field especially relates to a consolidate basic miniature steel-pipe pile of ground.
Background
The karst strata are widely distributed in China, mainly in provinces such as Guangxi, guizhou, yunnan and Hunan. The karst stratum is easy to generate cavities and gradually enlarge due to the long-term corrosion of underground water, the bottom layer structure is damaged, and the stratum bearing capacity is reduced. Building a building on a karst stratum must be careful, fine investigation needs to be carried out on the karst cave condition under the foundation of a foundation part, the bearing capacity of the foundation is detected, and the condition that the bearing capacity is insufficient and the building is damaged due to the fact that the stratum structure is damaged by the karst cave and the like, uneven settlement is generated, and the building is damaged is prevented. Particularly, for the pit building of a karst stratum, in order to utilize the land resources of the pit to the maximum extent, avoid the excavation of a large amount of earth and rock, reduce the secondary damage of the environment, part of the building foundation is placed on the side slope of the pit in the structural design. The design form has higher requirements on the foundation, the bearing capacity and the stability of the foundation must meet the design requirements, and the foundation must be reinforced when meeting special conditions such as karst caves and the like, so that the design requirements are met, and the safety of the building is ensured.
SUMMERY OF THE UTILITY MODEL
The to-be-solved problem of the utility model is to provide a consolidate basic miniature steel-pipe pile of ground, through both being applicable to karst stratum, also be applicable to the ground basis reinforcement of other strata (fault stratum, karst stratum, volcano stratum etc.), be particularly suitable for receiving groundwater to dissolve for a long time and lose, produce the cavity and use under the condition of progressively expanding, for example in the depression of karst bottom, perhaps at pit side slope building.
In order to solve the technical problem, the utility model adopts the technical scheme that: a miniature steel pipe pile for reinforcing foundation comprises: the grouting pipe comprises a plurality of spliced pipe bodies, wherein at least two grouting pipes are arranged in the pipe bodies and used for grouting into the pipe bodies;
the grouting reinforcement structure is characterized in that a pile head is arranged at one end of the pipe body, a grout stopping section and a grouting section are sequentially arranged on one side, away from the pile head, of the pipe body, the grout stopping section is not provided with a hole, and the grouting section is provided with a grouting hole and is used for grouting reinforcement.
Furthermore, the outer wall ring of the splicing part of the pipe body is provided with a ring belt piece for reinforcing connection.
Further, the grouting section comprises: the first grouting section is connected with the grout stopping section, and the second grouting section is connected with the pile head; the first grouting section and the second grouting section are arranged at intervals along the pipe body.
Furthermore, the first grouting section is provided with a plurality of groups of first grouting holes in a quincunx shape at least along four directions;
the second grouting section is provided with a plurality of groups of second grouting holes in a quincunx shape at least along four directions.
Furthermore, the first grouting holes of two adjacent groups are arranged at intervals; and the second grouting holes of two adjacent groups are arranged at intervals.
Due to the adoption of the technical scheme, the method has the following beneficial effects:
the miniature steel pipe piles can be flexibly arranged according to the distribution condition of the foundation karst caves, and the reinforcing tool has pertinence and can realize accurate reinforcement.
The miniature steel pipe pile foundation stabilization technology adopts finished product small-diameter steel pipe grouting reinforcement to treat foundation karst caves, and has the advantages of simple structure, clear process, convenient construction and easy quality control.
The bearing capacity of the miniature steel pipe pile is detected by a high strain detection method, and detection shows that the bearing capacity of the miniature steel pipe pile is strong in compression resistance and good in reinforcing effect, and the bearing capacity of the platform ring beam foundation is comprehensively improved.
Drawings
Fig. 1 is an overall schematic view of an embodiment of the present invention;
FIG. 2 is an enlarged view of section B of an embodiment of the present invention;
fig. 3 is an enlarged view of a node C according to an embodiment of the present invention.
In the figure:
1. first slip casting pipe 2, pile head 3, second slip casting pipe
4. Steel pipe 5, grouting section 6 and grout stopping section
7. First slip casting section 8, second slip casting section 9, reinforcement reinforcing bar
10. Grouting hole 11, annular steel plate 12 and drilling hole
Detailed Description
The invention will be further described with reference to the following examples and drawings:
in an embodiment of the present invention, as shown in fig. 1, a micro steel pipe pile for reinforcing a foundation comprises: the reinforcement method comprises the following steps that a plurality of spliced pipe bodies are arranged, at least two grouting pipes are arranged in each pipe body in the reinforcement pouring process, grouting is conducted into the pipe bodies through the grouting pipes, and then grouting is conducted into a foundation to be reinforced; one end of the pipe body is provided with a pile head 2, one side of the pipe body, which is far away from the pile head 2, is sequentially provided with a grout stopping section 6 and a grouting section 5, wherein the outer wall of the grout stopping section 6 is not provided with a hole, the grouting section 5 is provided with a grouting hole 10, and grouting is performed into the foundation through the provided grouting hole 10.
Specifically, in this embodiment, the pipe body is a steel pipe 4, and the steel pipe 4 is a seamless steel pipe with a diameter of phi 108x4.5mm, so that the strength of the steel pipe pile is higher, the small diameter meets the bearing capacity, and the joint is connected by welding with a wire joint in a butt welding manner; simultaneously, two grouting pipes are arranged in the steel pipe 4, and the grouting pipes are respectively: the grouting device comprises a first grouting pipe 1 and a second grouting pipe 3, wherein in the embodiment, the first grouting pipe 1 is a PVC pipe with the diameter of phi 20mm, and the second grouting pipe 3 is a galvanized split grouting pipe with the diameter of phi 22 mm. Pile head 2 adopts the cut-weld to beat into the closed boots head, then adds 3 reinforcement reinforcing bars 9 of welding for strengthen the bulk strength.
As shown in fig. 1, a ring belt member is further arranged at the splicing position of the plurality of steel pipes 4 in a circumferential direction, and the connection between the two steel pipes 4 is reinforced by the ring belt member; in the embodiment, the annular band piece is an annular band steel plate 11, and the joint of the two steel pipes 4 is wound with the annular band steel plate 11 with the thickness of 5mm and is welded, fixed and reinforced to prevent cracking.
As shown in fig. 1, the grouting section 5 includes: the grouting device comprises a first grouting section 7 and a second grouting section 8, wherein the first grouting section 7 is connected with a grout stopping section 6, and the second grouting section 8 is connected with a pile head 2; the first grouting section 7 and the second grouting section 8 are arranged at intervals along the steel pipe 4. Wherein the first grouting section 7 is provided with a plurality of groups of first grouting holes in a quincunx shape at least along four directions; the second grouting section 8 is provided with a plurality of groups of second grouting holes in a quincunx shape at least along four directions; the first grouting holes of adjacent groups are arranged at intervals; the second grouting holes of the adjacent groups are also arranged at intervals.
Specifically, in this embodiment, interval 1200mm sets up between first slip casting section 7 and the second slip casting section 8, and the first injected hole of multiunit that the diameter is 5mm is seted up with the quincunx along four directions on the first slip casting section 7, and the multiunit second injected hole that the diameter is 5mm is seted up with the quincunx along four directions on the second slip casting section 8, and interval 300mm sets up between adjacent two sets of first injected holes, and the same interval 300mm sets up between adjacent two sets of second injected holes. Specifically, the second grouting section 8 is arranged in the range of 2m on one side of the steel pipe 4 close to the pile head 2, so that the drilling range is filled with slurry; it is contemplated that the first grouting section 7 may be spaced from the second grouting section 8 by, but not limited to, 1200mm, and that the first grouting section 7 may be spaced from the second grouting section 8.
The utility model discloses a working process of an embodiment:
construction preparation: and manufacturing the steel pipe pile according to the connection relation, wherein the grouting pipe is made of phi 108x4.5 steel pipes and is connected by a turning thread joint. Keep away from one side of pile head 2 on the body and set gradually and end thick liquid section 6 and slip casting section 5, wherein end 6 outer walls of thick liquid section and do not set up the hole, slip casting hole 10 has been seted up to slip casting section 5, and 2m on steel pipe top end is the section 6 trompil not, and slip casting section 5 includes: first slip casting section 7 and second slip casting section 8, only thick liquid section 6 is connected to first slip casting section 7, pile head 2 is connected to second slip casting section 8, interval 1200mm sets up between first slip casting section 7 and the second slip casting section 8, set up the first injected hole of multiunit that the diameter is 5mm along four directions with the quincunx on the first slip casting section 7, set up the multiunit second injected hole that the diameter is 5mm along four directions with the quincunx on the second slip casting section 8, interval 300mm sets up between adjacent two sets of first injected holes, same interval 300mm sets up between adjacent two sets of second injected holes. The pile tip end is welded into a closed shape, and then 3 steel bars are welded. The second grouting section 8 is arranged in the range of 2m of one side, close to the pile head 2, of the steel pipe 4, so that the drilling range is filled with slurry.
Leveling the field: in order to guarantee that the subsequent miniature steel pipe pile operation safe ring beam foundation is cut to the designed bottom elevation, the ring beam foundation is cut to the designed bottom elevation and then cut downwards by 50cm, silt is removed through an excavator and manpower, C40 concrete with the thickness of 40cm is backfilled to 10cm below the designed bottom elevation of the foundation, and the concrete is used as a subsequent building frame body and a platform for placing drilling machinery.
And (3) measurement and paying-off: the method comprises the following steps of measuring and setting off the distance and the elevation of the pile foundation according to the design requirements of a drawing, namely determining the distance and the elevation between the steel pipe piles, and further determining the position of the steel pipe piles, wherein the miniature steel pipe piles are arranged according to a rectangle, and the arrangement form can be flexibly adjusted according to the distribution condition of the karst cave under a foundation.
Erecting an operation frame: before the construction of the miniature steel pipe pile, a bearing platform is excavated in place, an operation frame needs to be erected, the operation frame needs to be erected according to an industrial standard, and the operation frame is relatively perfect in the prior art, so that the operation frame is not repeated, wherein the operation frame is erected by adopting phi 48x3 steel pipes, the distance between vertical rods is 900mx900mm, and the distance between a sweeping rod and the ground is 200mm.
Drilling by a drilling machine: drilling according to the position of the steel pipe pile, leveling the site before a drilling machine is in place, correcting the levelness of the drilling machine and the verticality of a drill rod after the drilling machine is installed in place, controlling the deviation of the verticality of the pile body within 0.5 percent, controlling the deviation of the pile position within +/-3 cm, and determining the drilling depth according to the geological survey report requirement, wherein the drilling depth is 1m when the drilling depth enters the complete rock stratum; the drilling diameter is greater than the steel-pipe pile diameter, and in this embodiment, the drilling diameter of miniature steel-pipe pile is 150mm, places the steel-pipe pile through the drilling.
Hole cleaning: before grouting, the drill hole 12 needs to be cleaned, slurry in the drill hole 12 is discharged, and the thickness of sediment at the bottom of the hole is controlled within 5 cm.
Installing a steel pipe: after the drill hole 12 is cleaned, the steel pipe 4 with the pile head 2 is placed in time, the steel pipe 4 is naturally placed in the drill hole 12, and the pile head 2 is located at the lowest part and cannot be pressed in by strong force so as to avoid damage.
Installing a grouting machine: the slip casting machine is fixed at a specified position and is connected with a specified power supply.
And (3) installation of a grouting pipe: after the steel pipe 4 is installed, grouting is needed in time to avoid stratum hole collapse. The grouting pipe is connected with a grouting machine and is arranged in the steel pipe 4 in the drill hole 12, and meanwhile, the joint of the grouting machine and the grouting pipe is sealed; in order to ensure that the grouting body is tightly combined with the surrounding soil body, a grout stopping plug is arranged at the position of the hole 12 for pressure stabilization. And grouting records need to be made in the grouting process.
Mixing cement paste: P.O 42.5-grade ordinary Portland cement is adopted to mix cement paste according to the water cement ratio of 0.45-0.50 by special equipment, a grouting test is carried out before grouting construction, the mix proportion of the cement paste and the grouting pressure are adjusted, and the grouting effect is guaranteed.
Primary normal pressure grouting: and (3) controlling the water cement ratio to be 0.45-0.50, carrying out primary normal pressure grouting until the cement slurry flows out from the drill hole 12, sealing one end of the steel pipe pile close to the grout stopping section 6, pressurizing for several minutes, and waiting until the cement slurry flows out from the steel pipe again.
Multiple pressurizing and grouting: when the first normal pressure grouting does not reach the filling coefficient of the design requirement, the steps are repeated to repeatedly pressurize and grout the steel pipe pile for many times, the grouting pressure of the multiple pressurizing and grouting is greater than the grouting pressure in the step of the one pressurizing and grouting, and the grout body filling of the pile body is ensured.
If the drilled core sample still has karst cave after multiple times of pressurized grouting, enlarging the layout area of the miniature steel pipe pile, and repeating the steps until no karst cave exists in the enlarged range of the periphery of the foundation
In the embodiment, the compaction grouting is carried out twice, wherein in the first normal-pressure grouting, a grouting machine is connected with a first grouting pipe 1 until the orifice overflows and the grouting is finished; and (3) performing medium-high pressure grouting for the second time, wherein the water-cement ratio is 0.5, the grouting is performed 10-15 hours after the first grouting is completed, the grouting machine is connected with a second grouting pipe 3, and the second grouting finishing standard is that the grouting is continued for 5min under the design pressure when the grouting rate is less than 1L/min, and the grouting is finished.
The above detailed description of the embodiments of the present invention is only for the purpose of describing the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. The equivalent changes and improvements made according to the application scope of the present invention should be still included in the patent coverage of the present invention.
Claims (4)
1. The utility model provides a miniature steel-pipe pile of reinforcement ground basis which characterized in that includes: the grouting pipe comprises a plurality of spliced pipe bodies, wherein at least two grouting pipes are arranged in the pipe bodies and are used for grouting into the pipe bodies in batches;
a pile head is arranged at one end of the pipe body, a grout stopping section and a grouting section are sequentially arranged on one side, away from the pile head, of the pipe body, the grout stopping section is not provided with a hole, and the grouting section is provided with a grouting hole and is used for grouting reinforcement;
the slip casting section includes: the first grouting section is connected with the grout stopping section, and the second grouting section is connected with the pile head; the first grouting section and the second grouting section are arranged at intervals along the pipe body and are used for grouting into holes outside the pipe body in batches.
2. The micro steel pipe pile for reinforcing foundation according to claim 1, wherein: the outer wall of the splicing part of the pipe body is annularly provided with a ring belt piece for reinforcing connection.
3. The micro steel pipe pile for reinforcing foundation according to claim 1, wherein: the first grouting section is provided with a plurality of groups of first grouting holes in a quincunx shape at least along four directions;
and the second grouting section is provided with a plurality of groups of second grouting holes in a quincunx shape at least along four directions.
4. The micro steel pipe pile for reinforcing foundation according to claim 3, wherein: the first grouting holes of two adjacent groups are arranged at intervals; and the second grouting holes of two adjacent groups are arranged at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123428173.8U CN217601402U (en) | 2021-12-31 | 2021-12-31 | Miniature steel pipe pile for reinforcing foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123428173.8U CN217601402U (en) | 2021-12-31 | 2021-12-31 | Miniature steel pipe pile for reinforcing foundation |
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| CN217601402U true CN217601402U (en) | 2022-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215042A (en) * | 2021-12-31 | 2022-03-22 | 中冶天工集团天津有限公司 | Miniature steel pipe pile for reinforcing foundation and construction method thereof |
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- 2021-12-31 CN CN202123428173.8U patent/CN217601402U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215042A (en) * | 2021-12-31 | 2022-03-22 | 中冶天工集团天津有限公司 | Miniature steel pipe pile for reinforcing foundation and construction method thereof |
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