CN219080294U - Telescopic steel screw pile - Google Patents
Telescopic steel screw pile Download PDFInfo
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- CN219080294U CN219080294U CN202222996730.4U CN202222996730U CN219080294U CN 219080294 U CN219080294 U CN 219080294U CN 202222996730 U CN202222996730 U CN 202222996730U CN 219080294 U CN219080294 U CN 219080294U
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Abstract
The utility model provides a telescopic steel screw pile. The steel spiral pile comprises a steel pipe pile, an inner shaft steel pipe and a telescopic spiral steel sheet. The inner shaft steel pipe is positioned in the steel pipe pile, and the spiral steel sheet is hinged to the outer side face of the inner shaft steel pipe; the pipe wall of the steel pipe pile is provided with a spiral guide hole, and the spiral steel sheet is accommodated in the steel pipe pile in a folding manner before the inner shaft steel pipe is lifted; in the lifting process of the inner shaft steel pipe, the spiral steel sheet stretches outwards to extend out of the outer side face of the steel pipe pile. Compared with the traditional screw pile hammering or screw entering the soil layer, the pile body soil-entering resistance is greatly reduced, the pile soil-entering speed can be greatly improved, no waste soil is generated in the construction process, and the construction cost is reduced. The traditional spiral pile is driven to continuously cut and disturb soil around the pile, so that the original state and mechanical property of the soil around the pile are damaged.
Description
Technical Field
The utility model belongs to the field of spiral pile foundations, and particularly relates to a telescopic steel spiral pile.
Background
A steel screw pile, also called a screw, is a tubular pile with screw blades wound on the surface of a metal pipe after hot forging, which is screwed into the ground by special ground screw screwing equipment to replace the original concrete foundation, and the top end is connected with a load. As an underground foundation, the ground screw has the advantages of convenient construction, short period, small influence by construction environment, no damage to local environment, convenient migration and recovery, and the like.
In 1833, uk construction workers Alexander Mitchell utilized pull-out screw piles (known as screw anchors) as the foundation for lighttowers on islands around england. Limited to the current state of the art, its application range expands more slowly.
The research on the foundation of the spiral pile is carried out in the foreign country earlier, the A.B. company adopts the spiral steel pipe pile in the foundation engineering of the power transmission tower, and the first standard-PISA (Power Installed Screw Anchors) related to the spiral steel pipe pile is formulated in 1959. Section 5.13 of section 5 of the second design standard of the building code issued in the soviet union 1979, a screw pile, specifies the design standard of the screw pile foundation. Australia INSTANT FOUNDATION developed a steel pipe screw pile for foundation engineering in 1992, and Fukuei Kosan in Japan developed a fully prefabricated steel fiber concrete screw pile S.P-300 in 1995 (spiral concrete pile type).
Domestic Chen Rihong is equal to 1999, a relatively systematic study of precast concrete screw piles. In 2002, the university of Wuhan urban construction institute develops a full-thread cast-in-place pile, demonstrates the pile type and the traditional pile type through actual engineering, compares the bearing capacity and the economic benefit, and obtains: the concrete consumption of the screw pile is only 60% -70% of that of the straight cast-in-place pile with the same diameter, and the ultimate bearing capacity of the screw pile is more than 2 times that of the straight cast-in-place pile with the same diameter. In 2004, the institute of engineering mechanics of northeast university, institute of research of sunk yang, institute of electric power exploration and design of Liaoning, jointly developed the related research work of prefabricated spiral pile foundation. In 2011, the national power grid company has issued enterprise standards such as "technical specification for designing spiral anchor foundation of overhead transmission line" on the basis of summarizing experimental research and experimental results of engineering application of spiral pile foundation of transmission line in the Liaoning dandong, yingkou, and Panjin of the last ten years.
Traditional steel screw pile sets up helical blade at the steel pipe surface, and the screw pile is general for rotatory or hammering pile head goes into soil, and external helical blade goes into soil decline process and the direct shearing action that takes place of stake week soil, and the process of going into soil has following technical problem and not enough:
(1) The pile surrounding soil is mechanically cut and segmented, so that the integrity and the continuity of the pile surrounding soil are damaged, and the original state and the mechanical property of the pile surrounding soil are affected;
(2) The larger hammering force or rotation torque is needed, the construction cost is higher, and the larger the pile diameter is, the more the cost is increased;
(3) The void ratio of the contact surface between the helical blade and the soil is higher due to rotary drilling or hammering, so that the biting action and the co-working performance of the helical pile and the soil layer are reduced, and the self bearing advantage of the helical pile is reduced.
(4) The traditional pile body soil-entering process can generate a certain volume of waste soil, and the construction cost is increased.
Disclosure of Invention
The utility model aims to provide a telescopic steel screw pile, which can solve the problems that the steel screw pile in the prior art has large disturbance to the surrounding soil of the pile, has higher void ratio of the contact surface of a screw blade and soil, and reduces the self bearing advantage of the screw pile; and the pile body has large soil penetration resistance and can generate a certain volume of waste soil, so that the problem of higher construction cost is caused.
The utility model is realized in such a way that the telescopic steel screw pile comprises a hollow steel pipe pile, a hollow inner shaft steel pipe, a telescopic screw steel sheet and a steel pipe pile top connecting piece;
the steel pipe pile top connecting piece is fixed at the top of the steel pipe pile, the steel pipe pile top connecting piece is provided with a threaded hole, the inner shaft steel pipe is positioned in the steel pipe pile, the inner shaft steel pipe downwards passes through the threaded hole and is in threaded connection with the threaded hole, and the bottom end of the inner shaft steel pipe is a free end;
the top of the inner shaft steel pipe is provided with a grouting opening, the pipe wall of the inner shaft steel pipe is provided with a plurality of grouting holes, and the spiral steel sheet is hinged to the outer side face of the inner shaft steel pipe;
a spiral guide hole is formed in the pipe wall of the steel pipe pile, and the spiral steel sheet is stored in the steel pipe pile in a shrinkage folding mode before the inner shaft steel pipe is lifted; in the inner shaft steel pipe lifting process, the spiral steel sheet moves under the guide of the spiral guide hole and stretches outwards, and when the spiral steel sheet is in a stretching state, the outer side edge of the spiral steel sheet can outwards protrude out of the outer side face of the steel pipe pile.
Further, the steel screw pile further comprises an inner shaft steel pipe top connecting piece, and the inner shaft steel pipe top connecting piece is fixed at the top of the inner shaft steel pipe.
Further, the bottom end of the steel pipe pile is conical.
Further, the outer periphery of the inner shaft steel pipe is hinged with a plurality of telescopic spiral steel sheets along the axial direction of the inner shaft steel pipe.
Further, before the inner shaft steel pipe is lifted, the spiral steel sheet is embedded into the spiral guide hole, and the outer diameter line of the spiral steel sheet is flush with the outer side face of the steel pipe pile.
Further, the spiral steel sheet is of an integral sheet structure.
Further, the spiral steel sheet comprises a plurality of strip structures which are arranged in a scattered mode, and each strip structure is hinged to the outer periphery of the inner shaft steel tube.
Compared with the prior art, the utility model has the beneficial effects that:
1. compared with the traditional screw pile, the telescopic steel screw pile provided by the utility model has the advantages that the outer surface of the pile body is a cylinder in the pile pressing (driving) stage, and the pile can be pressed (driven) to the designed depth by adopting a static force ballast or hammering impact mode. Compared with the traditional screw pile hammering or screw entering the soil layer, the pile body soil-entering resistance is greatly reduced, the pile soil-entering speed can be greatly improved, and the cost is reduced.
2. Compared with the traditional spiral pile for physically dividing and cutting the stratum, the steel spiral pile effectively protects the original state and continuity of the stratum, reduces the disturbance area of the original state soil, and well reserves and maintains the performances of the surrounding soil of the pile. The steel spiral pile is driven to compact the surrounding soil, and a load-bearing common body of the spiral pile-soil layer is formed after the spiral steel sheet stretches out, so that the problem of larger void ratio at the pile-soil contact surface caused by the vibration of the traditional pile driving and the rotation of the spiral steel sheet is reduced to the maximum extent, the compactness of the pile-soil contact surface is enhanced, and the stability of the pile body in the soil layer is increased.
3. After the spiral steel sheet is cut into a soil layer through lifting rotation, solidifying slurry is poured into the pile through the inner shaft steel pipe, the slurry is diffused in the inner space of the steel pipe pile outside after the inner shaft steel pipe is filled, an integrated solidifying area of 'spiral pile-non-spiral pile (steel pile) -pile surrounding soil' is formed, the integral anchoring capacity of the spiral pile is effectively improved, and the technology integrates three technical advantages of 'spiral anchoring, rotation and expansion of the inner shaft spiral steel sheet and grouting solidifying'.
4. Compared with cylindrical steel piles or spiral piles with the same size, the novel telescopic steel spiral pile has the advantages that under the condition of small cost improvement, the compression resistance bearing performance and the pulling resistance anchoring performance are obviously improved.
5. The novel telescopic steel spiral pile does not generate waste soil in the construction process, and is beneficial to reducing the construction cost.
Drawings
FIG. 1 is a central cross-sectional view of a telescopic steel screw pile according to the present embodiment;
FIG. 2 is an elevation view of a telescopic steel screw pile according to the present embodiment;
FIG. 3 is a front-rear cross-sectional view showing the lifting of a spiral steel sheet of a telescopic steel spiral pile according to the present embodiment;
fig. 4 is a construction flow chart of a telescopic steel screw pile according to the present embodiment.
Reference numerals in the drawings:
1-steel pipe pile, 11-heliciform guiding hole, 2-interior axle steel pipe, 21-slip casting mouth, 22-play thick liquid hole, 3-spiral steel sheet, 3 a-folded state's spiral steel sheet, 3 b-extended state's spiral steel sheet, 4-steel pipe pile top connecting piece, 41-screw hole, 5-interior axle steel pipe top connecting piece.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., are based on those shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two parts. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, there is shown a telescopic steel screw pile according to the present embodiment, which includes a hollow steel pipe pile 1, a hollow inner shaft steel pipe 2, a telescopic screw steel sheet 3, a steel pipe pile top connector 4, and an inner shaft steel pipe top connector 5.
The steel-pipe pile top connecting piece 4 is fixed at the top of the steel-pipe pile 1, the steel-pipe pile top connecting piece 4 is provided with a threaded hole 41, the inner shaft steel pipe 2 is positioned in the steel-pipe pile 1, the inner shaft steel pipe 2 downwards penetrates through the threaded hole 41 and is in threaded connection with the threaded hole 41, the bottom end of the inner shaft steel pipe 2 is a free end, the steel-pipe pile 1 is integrally cylindrical, and the bottom end of the steel-pipe pile is conical.
The top opening of the inner shaft steel tube 2 is used as a grouting opening 21, a plurality of grouting holes 22 distributed at intervals are reserved on the tube wall of the inner shaft steel tube 2 along the axial direction of the inner shaft steel tube, and the spiral steel sheet 3 is hinged on the outer side surface of the inner shaft steel tube 2.
Referring to fig. 2, a spiral guide hole 11 is formed in a wall of the steel pipe pile 1. Referring to fig. 3, before the inner shaft steel pipe 2 is lifted, a spiral steel sheet 3a is stored in the steel pipe pile 1 in a shrink-folding manner; during the lifting process of the inner shaft steel pipe 2, the spiral steel sheet 3a slides along the spiral guide hole 11 under the guide of the spiral guide hole 11 and stretches outwards, and when the spiral steel sheet 3b is in the stretching state, the outer side edge of the spiral steel sheet stretches outwards and stretches outwards to the outer side face of the steel pipe pile 1, so that pile surrounding soil can be cut to be embedded into the pile surrounding soil.
The inner shaft steel pipe top connecting piece 5 is fixed at the top of the inner shaft steel pipe 2; the inner space of the inner shaft steel pipe 2 and the space between the outer periphery of the inner shaft steel pipe 2 and the inner wall of the steel pipe pile 1 are solidified by grouting.
Specifically, the outer periphery of the inner shaft steel tube 2 is hinged with a plurality of telescopic spiral steel sheets 3 along the axial direction of the inner shaft steel tube 2. Before the inner-shaft steel pipe 2 is lifted, the spiral steel sheet 3 is embedded in the spiral guide hole 11, and the outer diameter line of the spiral steel sheet 3 is flush with the outer side surface of the steel pipe pile 1.
In practical application, the spiral steel sheet 3 is an integral sheet structure, or the spiral steel sheet 3 may be a plurality of strip structures arranged in a dispersed manner, and each strip structure is hinged with the outer side surface of the inner shaft steel tube 2.
The steel pipe pile 1 is made of common steel or low alloy steel pipes of Q235 and Q345, and the pipe wall thickness of the steel pipe pile 1 is not smaller than 4mm; the galvanized layer of the steel pipe pile 1 should not be smaller than 80 μm.
Referring to fig. 4, the embodiment also provides a construction method of the steel screw pile, which comprises the following steps:
s10, positioning and paying-off are carried out on a construction site;
s20, connecting the top of the steel pipe pile 1 with a screwing machine or a ballast machine, and guaranteeing firm connection;
s30, carrying the pile to be in place by a screwing machine or a ballast machine, so as to ensure the verticality of the steel spiral pile;
s40, screwing or ballasting the lower pile, and controlling the lower pile within a set lower pile speed range in the lower pile process;
s50, stopping pile discharging after the sinking depth of the steel spiral pile reaches the designed depth;
s60, connecting the inner shaft steel pipe 2 with the top of the inner shaft steel pipe by adopting a screwing machine, and ensuring firm connection;
s70, the screwing machine works, the inner shaft steel pipe 2 is lifted through rotation, and in the lifting process of the inner shaft steel pipe 2, the spiral steel sheet 3 is pulled, so that the spiral steel sheet 3 gradually stretches outwards from a folded state, and the outer side face of the steel pipe pile 1 protrudes from the spiral guide hole 11;
s80, stopping lifting after the inner shaft steel tube 2 is lifted to the designed height;
s90, grouting is conducted into the inner shaft steel pipe 2 until the inner space of the inner shaft steel pipe 2 and the inner space of the steel pipe pile 1 are filled with slurry, and in the grouting process, grouting pressure, flow and volume are controlled;
and S100, after the construction is finished, the next pile is constructed in a shifting mode, and the steps S10-S90 are repeatedly executed.
Preferably, the construction method further comprises the following steps:
before pile construction, trial pile forming is carried out, various construction quality control parameters in the construction process are determined according to design files and standard requirements, and the limit bearing capacity of the single pile is determined by combining the trial pile forming.
Selecting proper construction equipment according to pile type, pile length, stratum condition and site construction condition; checking and calculating the connection strength and grouting pressure between construction equipment and the top of the steel pipe pile 1 and the top of the inner shaft steel pipe 2, and adopting a stable and reasonable connection mode to ensure the safety of the construction process.
The allowable deviation of pile position lofting is smaller than 10mm, the verticality deviation when the pile is screwed in is smaller than 1%, if the pile is jammed, the grouting is not smooth, the pile position is deviated or inclined in the rotating process, the pile is required to be stopped immediately, the reason is found out, and the operation can be continued after corresponding measures are taken.
Compared with the traditional screw pile, the steel screw pile of the embodiment has the advantages that the outer surface of the pile body is a cylinder in the pile pressing (driving) stage, and the pile can be pressed (driven) to the designed depth by adopting a static force ballast or hammering and beating mode. Compared with the traditional screw pile hammering or screw entering the soil layer, the pile body soil-entering resistance is greatly reduced, the pile soil-entering speed can be greatly improved, and the cost is reduced.
Compared with the traditional spiral pile which is used for physically dividing and cutting a stratum, the steel spiral pile effectively protects the original state and continuity of the stratum, reduces the disturbance area of the original state soil, and well reserves and maintains the self performance of the surrounding soil. The steel spiral pile is driven to compact the surrounding soil, a load-bearing common body of a spiral pile-soil layer is formed after the spiral steel sheet 3 stretches out, the problem that the void ratio of the pile-soil contact surface generated by the traditional pile driving vibration and the spiral steel sheet rotation soil driving is greatly reduced, the compactness of the pile-soil contact surface is enhanced, and the stability of the pile body in the soil layer is increased.
After the spiral steel sheet 3 cuts into a soil layer through lifting rotation, solidifying slurry is poured into the pile through the inner shaft steel pipe 2, the slurry is diffused in the inner space of the outer steel pipe pile 1 after the inner shaft steel pipe 2 is filled, so that a 'spiral pile-non-spiral pile (steel pile) -pile surrounding soil' integrated solidifying area is formed, the integral anchoring capacity of the spiral pile is effectively improved, and the technology integrates the three technical advantages of spiral anchoring, inner shaft spiral steel sheet rotating stretching and grouting solidifying.
Compared with cylindrical steel piles or spiral piles with the same size, the steel spiral pile has the advantages that under the condition that the cost is improved slightly, the compression bearing performance and the anti-pulling anchoring performance are improved remarkably.
The steel spiral pile of the embodiment does not generate waste soil in the construction process, and is beneficial to reducing the construction cost.
The telescopic steel screw pile is suitable for stratum such as filling soil, silt soil, cohesive soil, sand soil, loose-medium density gravelly soil, fully weathered rock, strong weathered soft rock and the like. The method can be applied to the fields of rock-soil and underground engineering, non-excavation piles, foundation reinforcement, assembled building foundations and the like.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (7)
1. The telescopic steel spiral pile is characterized by comprising a hollow steel pipe pile, a hollow inner shaft steel pipe, a telescopic spiral steel sheet and a steel pipe pile top connecting piece;
the steel pipe pile top connecting piece is fixed at the top of the steel pipe pile, the steel pipe pile top connecting piece is provided with a threaded hole, the inner shaft steel pipe is positioned in the steel pipe pile, the inner shaft steel pipe downwards passes through the threaded hole and is in threaded connection with the threaded hole, and the bottom end of the inner shaft steel pipe is a free end;
the top of the inner shaft steel pipe is provided with a grouting opening, the pipe wall of the inner shaft steel pipe is provided with a plurality of grouting holes, and the spiral steel sheet is hinged to the outer side face of the inner shaft steel pipe;
a spiral guide hole is formed in the pipe wall of the steel pipe pile, and the spiral steel sheet is stored in the steel pipe pile in a shrinkage folding mode before the inner shaft steel pipe is lifted; in the inner shaft steel pipe lifting process, the spiral steel sheet moves under the guide of the spiral guide hole and stretches outwards, and when the spiral steel sheet is in a stretching state, the outer side edge of the spiral steel sheet can outwards protrude out of the outer side face of the steel pipe pile.
2. A steel screw pile according to claim 1, further comprising an inner shaft steel pipe top connector secured to the top of the inner shaft steel pipe.
3. A steel screw pile according to claim 1, wherein the bottom end of the steel pipe pile is tapered.
4. A steel screw pile according to claim 1, wherein the outer periphery of the inner shaft steel pipe is hinged with a plurality of said telescopic screw steel sheets in the axial direction of the inner shaft steel pipe.
5. A steel screw pile according to claim 1, characterised in that the screw steel sheet is embedded in the helical pilot hole before the inner shaft steel pipe is lifted, and that the outer diameter line of the screw steel sheet is flush with the outer side of the steel pipe pile.
6. A steel screw pile according to any one of claims 1 to 5, characterised in that the screw steel sheet is of unitary sheet-like construction.
7. A steel screw pile according to any one of claims 1 to 5, wherein said screw steel sheet comprises a plurality of discretely arranged bar formations, each of said bar formations being hinged to an outer periphery of said inner shaft steel tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222996730.4U CN219080294U (en) | 2022-11-11 | 2022-11-11 | Telescopic steel screw pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222996730.4U CN219080294U (en) | 2022-11-11 | 2022-11-11 | Telescopic steel screw pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219080294U true CN219080294U (en) | 2023-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222996730.4U Active CN219080294U (en) | 2022-11-11 | 2022-11-11 | Telescopic steel screw pile |
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| Country | Link |
|---|---|
| CN (1) | CN219080294U (en) |
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2022
- 2022-11-11 CN CN202222996730.4U patent/CN219080294U/en active Active
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