CN211713955U - Slip casting type steel pipe screw pile - Google Patents
Slip casting type steel pipe screw pile Download PDFInfo
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- CN211713955U CN211713955U CN201922222272.7U CN201922222272U CN211713955U CN 211713955 U CN211713955 U CN 211713955U CN 201922222272 U CN201922222272 U CN 201922222272U CN 211713955 U CN211713955 U CN 211713955U
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Abstract
The utility model relates to the technical field of pile foundation, and discloses a slip casting type steel pipe screw pile, which comprises a solid square bar or a steel pipe with a leading part welded with a helical blade, an annular soil extrusion device, an extension steel pipe, a retaining wall sleeve, cement-based slurry and a connecting steel sleeve; the utility model discloses slip casting formula steel pipe screw pile is through setting up crowded native device of annular and dado sleeve pipe, form stable pile body hole on upper portion when guaranteeing steel pipe screw pile precession construction, then carry out the slip casting in the dado sleeve pipe, form slip casting formula steel pipe screw pile, the pile body cross section has been increased on the one hand, pile body stability and structural bearing capacity have been improved, on the other hand has still formed anticorrosive sheath, the corrosion resisting property of screw pile has been promoted, therefore, slip casting formula steel pipe screw pile can improve bending rigidity and structural bearing capacity on the basis of steel pipe screw pile, and can improve the corrosion resisting property of pile to a certain extent.
Description
Technical Field
The utility model relates to a pile foundation technical field, especially a slip casting formula steel pipe screw pile and construction method thereof.
Background
With the rapid development of national economy, the power transmission line in the power industry is continuously developed, high and new technologies and advanced equipment are fully utilized, and the method has important practical significance for strengthening national power grid construction and improving economic benefits. In the process of construction, maintenance and rush repair of the power transmission line and the construction process of the stay wire of the overhead line, certain underground foundation is inevitably made. The existing foundation mainly comprises a reinforced concrete pile, is long in construction period, complex in procedure and high in manufacturing cost, and has great damage to the local environment. The steel pipe spiral pile is a special-shaped pile with a complex geometric surface, and is welded on a square steel rod or a steel pipe by a single-circle spiral blade or a plurality of spiral blades, a certain torque and a vertical axial force are applied to the top end of the pile through construction machinery, so that the pile is screwed into an underground soil body and mainly used for resisting vertical upward pulling or downward pressing loads, and the steel pipe spiral pile has the advantages of high construction speed, recoverability, small influence on the environment and better applicability. However, in areas with poor geological conditions, such as soft soil areas along the coast, the defects of poor stability and poor corrosion resistance of the pile body of the steel pipe spiral pile are also shown, so that the current steel pipe spiral pile needs to be improved so as to meet the requirements of power transmission engineering construction in special areas.
When the screw pile is applied to a soft land area, the screw part of the pile body needs to penetrate through a soft sludge layer to reach a clay bearing layer. Therefore, when the soft soil layer is thick, the length of the pile is increased, so that the slenderness ratio of the pile is too large, the bending rigidity is small, and the instability problem of the pile is caused; in addition, the steel pipe screw pile is buried in the part of a certain depth below the surface soil, and the corrosion of steel is serious due to the active water-gas exchange, so that the bearing performance of the pile foundation is remarkably reduced. If the cross section of the spiral pile is increased, the drilling difficulty of the pile is caused, and the cost is increased; the spraying of the protective layer on the outer surface of the steel only can play a certain role in corrosion prevention, the instability problem caused by small integral rigidity cannot be solved, and once the surface is damaged, the on-site repair is difficult.
SUMMERY OF THE UTILITY MODEL
To the above insufficiency, the utility model aims to provide a slip casting formula steel pipe screw pile and construction method thereof.
Realize the utility model discloses the technical solution of purpose does:
a slip casting type steel pipe screw pile is characterized by comprising a solid square rod or a steel pipe, an annular soil squeezing device, an extension part steel pipe, a retaining wall sleeve, cement-based slurry and a connecting steel sleeve, wherein the solid square rod or the steel pipe is provided with a guide part welded with a screw blade; the top end of a solid square rod or a steel pipe of the guide part welded with the helical blade is fixedly connected with the annular soil extrusion device, and the top end of the annular soil extrusion device is provided with one or more sections of extension steel pipes; the bottommost section of the extension part steel pipe is fixedly connected with the annular soil squeezing device through a connecting steel sleeve and a bolt, and two adjacent sections of the extension part steel pipes are fixedly connected through the connecting steel sleeve and the bolt; the outer side of each section of the extension part steel pipe is provided with a corresponding protecting wall sleeve, the bottom end of the lowest protecting wall sleeve is connected with the top end of the annular soil squeezing device, and two adjacent sections of protecting wall sleeves are connected through a connecting plate; and injecting cement-based slurry between the extension steel pipe and the retaining wall casing.
Preferably, the top end of the solid square rod or the steel pipe of the guide part welding spiral blade is fixedly connected with the annular soil extruding device through welding or bolts.
Preferably, the annular soil squeezing device comprises an annular steel plate, a soil squeezing steel plate and a limiting steel plate; a square hole or a round hole is formed in the center of the annular steel plate, a plurality of soil extrusion steel plates are arranged on the bottom surface of the annular steel plate, and each soil extrusion steel plate is perpendicular to the annular steel plate; the top surface of annular steel sheet is provided with the spacing steel sheet of a plurality of, and spacing steel sheet is along annular steel sheet hoop symmetrical arrangement all around.
Preferably, the bottom surface of annular steel sheet is provided with two crowded native steel sheet, and two crowded native steel sheet symmetry parallel arrangement are in annular steel sheet centre bore both sides, and every crowded native steel sheet is thick wedge down.
Preferably, the soil-extruding steel plate is a straight plate or an S-shaped curve plate.
Preferably, both ends of the extension part steel pipe and the connecting steel sleeve are symmetrically perforated; the bottommost section of the extension steel pipe is inserted into the connecting steel sleeve, the bottommost section of the extension steel pipe is fixedly connected with the connecting steel sleeve through a bolt, and the bottom end of the connecting steel sleeve is fixedly connected with the top end of the annular soil squeezing device through welding.
Preferably, a circular hole is formed in the center of the connecting plate, a plurality of limiting plates are arranged on the top surface and the bottom surface of the connecting plate, and the limiting plates are circumferentially and symmetrically arranged along the periphery of the connecting plate; the connecting plate is provided with a plurality of grouting holes for subsequent grouting pipes to pass through.
Preferably, the retaining wall casing is a steel pipe, a PVC pipe or an FRP pipe, and the connecting plate and the limiting plate are steel plates or FRP plates.
A construction method of a grouting type steel pipe spiral pile is characterized by comprising the following steps:
step one, welding a solid square rod or a steel pipe of a helical blade on a construction guide part: selecting a proper hydraulic pile driver according to the soil property of a construction site, and rotating a solid square rod or a steel pipe with a guide part welded with a helical blade to the top surface of the soil through the hydraulic pile driver;
step two, installing an annular soil squeezing device: after an annular steel plate of the annular soil extrusion device is welded and formed with the connecting steel sleeve, the annular soil extrusion device is fixedly connected with a solid square rod or a steel pipe of a guide part welding spiral blade through welding or mechanical occlusion;
step three, installing the steel pipe of the extension part: inserting the extension part steel pipe into the connecting steel sleeve, and fixedly connecting the extension part steel pipe with the connecting steel sleeve through a bolt; if the extension part steel pipes need to be installed in sections, the adjacent two sections of extension part steel pipes are fixedly connected through a connecting steel sleeve and a bolt;
step four, installing a wall protection sleeve: the bottom end of the wall protection sleeve is connected with a limiting steel plate of the annular soil squeezing device, and if the wall protection sleeve is installed along with the extended part of the steel pipe in a segmented mode, two adjacent sections of wall protection sleeves are connected through a connecting plate;
step five, constructing the extended part of the steel pipe and the wall protection sleeve: rotating the installed extension steel pipe and the wall protection sleeve to a designed elevation position by using a hydraulic pile driver;
step six, cement-based grouting body construction: placing the grouting pipe to the bottom of the retaining wall casing pipe, injecting the prepared cement slurry from the bottom through the grouting pipe, lifting the grouting pipe while grouting until the retaining wall casing pipe is filled and the cement slurry overflows obviously;
step seven, basic connection: and pouring a concrete foundation, and performing interface treatment on the extended part of the steel pipe, the retaining wall sleeve and the concrete.
Compared with the prior art, the utility model, it is showing the advantage:
(1) the utility model discloses slip casting formula steel pipe screw pile is through setting up crowded native device of annular and dado sleeve pipe, form stable pile body hole on upper portion when guaranteeing steel pipe screw pile precession construction, then carry out the slip casting in the dado sleeve pipe, form slip casting formula steel pipe screw pile, the pile body cross section has been increased on the one hand, pile body stability and structural bearing capacity have been improved, on the other hand has still formed anticorrosive sheath, the corrosion resisting property of screw pile has been promoted, therefore, slip casting formula steel pipe screw pile can improve bending rigidity and structural bearing capacity on the basis of steel pipe screw pile, and can improve the corrosion resisting property of pile to a certain extent.
(2) Compared with the traditional grouting pile, the grouting type steel pipe screw pile of the utility model can effectively control the volume of grouting liquid, reduce resource waste and protect the ecological environment of a construction site; compared with the traditional screw pile, the application problem in soft soil areas can be solved due to limited cost increase, the construction process is simple, and the operation is simple and convenient.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings required in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the utility model discloses the structural schematic of the solid square pole of slip casting formula steel pipe screw pile construction or steel pipe.
Fig. 2 is the structure schematic diagram of the extension steel pipe and the retaining wall casing for installing the grouting type steel pipe screw pile.
Fig. 3 is the structure schematic diagram of the sectional extension steel pipe and the retaining wall casing for installing the grouting type steel pipe screw pile.
Fig. 4 is the utility model discloses structural schematic during slip casting formula steel pipe screw pile slip casting construction.
Fig. 5 is the structure schematic diagram of the utility model discloses when slip casting formula steel pipe screw pile concreting basis.
Fig. 6 is the structural schematic diagram of the annular soil squeezing device in the grouting type steel pipe screw pile of the present invention.
Fig. 7 is the structural schematic diagram of the connecting plate in the grouting type steel pipe screw pile of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1, 2 and 3, the grouting type steel pipe screw pile comprises a solid square rod or steel pipe 1 with a guide part welded with a screw blade, an annular soil extrusion device 2, an extension part steel pipe 3, a retaining wall casing 4, cement-based slurry 5 and a connecting steel sleeve 6; the top end of a solid square rod or a steel pipe 1 of which the guide part is welded with a helical blade is fixedly connected with an annular soil extrusion device 2 through welding or bolts, and the top end of the annular soil extrusion device 2 is provided with one or more sections of extension part steel pipes 3; the bottommost section of the extension part steel pipe 3 is fixedly connected with the annular soil squeezing device 2 through a connecting steel sleeve 6 and a bolt, and the two adjacent sections of the extension part steel pipes 3 are fixedly connected through the connecting steel sleeve 6 and the bolt; the outer side of each section of the extension part steel pipe 3 is provided with a corresponding protective wall sleeve 4, the bottom end of the lowest section of the protective wall sleeve 4 is connected with the top end of the annular soil extrusion device 2, and two adjacent sections of the protective wall sleeves 4 are connected through a connecting plate 7; a cement-based slurry 5 is injected between the extension steel pipe 3 and the retaining wall sleeve 4.
The length of a solid square rod or a steel pipe 1 of the spiral blade welded on the guide part is 1.5m-3m, a solid square rod or a hollow steel pipe can be adopted as a main shaft for welding the spiral blade, the main shaft is selected to be capable of resisting the torsion force applied in the installation process, the side length of the section of the solid square rod is not less than 2cm, the diameter of the hollow steel pipe is not less than 5cm, the wall thickness is not less than 3mm, the end part of the solid square rod or the hollow steel pipe can be made into an irregular screw mouth or obliquely cut into 45 degrees, and the diameter of the projection plane of the spiral blade is not less than 10.
As shown in fig. 6, the annular soil squeezing device 2 comprises an annular steel plate 8, a soil squeezing steel plate 9 and a limiting steel plate 10; the center of the annular steel plate 8 is provided with a square hole or a round hole, the bottom surface of the annular steel plate 8 is fixedly provided with two soil extrusion steel plates 9 through welding, the two soil extrusion steel plates 9 are symmetrically arranged on two sides of the center hole of the annular steel plate 8 in parallel, each soil extrusion steel plate 9 is vertical to the annular steel plate 8, each soil extrusion steel plate 9 is in a wedge shape with the upper part thick and the lower part thin, and the soil extrusion steel plates 9 are straight plates or S-shaped curved plates; the top surface of the annular steel plate 8 is fixedly provided with a plurality of limiting steel plates 10 through welding, and the limiting steel plates 10 are circumferentially and symmetrically arranged along the periphery of the annular steel plate 8; wherein, the thickness of the annular steel plate 8 is not less than 10mm, and the diameter is slightly larger than the outer diameter of the wall protection sleeve 4; the minimum thickness of the soil-extruding steel plate 9 is not less than 3mm, and the distance between the outermost side of the limiting steel plate 9 and the central hole of the annular steel plate 8 is determined by the inner diameter of the wall-protecting sleeve 4.
Two ends of the extension part steel pipe 3 and the connecting steel sleeve 6 are symmetrically provided with through holes, and the number of the through holes is not less than 2; the bottommost section of the extension part steel pipe 3 is inserted into the connecting steel sleeve 6, the bottommost section of the extension part steel pipe 3 is fixedly connected with the connecting steel sleeve 6 through a bolt, the bottom end of the connecting steel sleeve 6 is fixedly connected with the top end of the annular soil squeezing device 2 through welding, and two adjacent sections of the extension part steel pipes 3 are fixedly connected through the connecting steel sleeve 6 and the bolt; the diameter and the wall thickness of the extension part steel pipe 3 are not smaller than those of the guide part steel pipe, the length of each extension part steel pipe 3 is 2m-6m, and the wall thickness of the connecting steel sleeve 6 is not smaller than that of the extension part steel pipe 3.
The axis of the wall protection sleeve 4 coincides with the axis of the extension part steel pipe 3, the wall protection sleeve 4 is a steel pipe, a PVC pipe or an FRP pipe, the wall thickness of the wall protection sleeve 4 is not less than 5mm, and the inner diameter of the wall protection sleeve 4 is more than 100mm larger than the inner diameter of the extension part steel pipe 3.
As shown in fig. 7, a circular hole is formed in the center of the connecting plate 7, a plurality of limiting plates 11 are arranged on the top surface and the bottom surface of the connecting plate 7, and the limiting plates 11 are circumferentially and symmetrically arranged along the periphery of the connecting plate 7; the connecting plate 7 is provided with a plurality of grouting holes 12 for subsequent grouting pipes to pass through; the connecting plate 7 and the limiting plate 11 are steel plates or FRP plates, and the diameter of the connecting plate 7 is slightly larger than the outer diameter of the retaining wall sleeve 4.
A construction method of a grouting type steel pipe spiral pile is characterized by comprising the following steps:
step one, welding a solid square rod or a steel pipe of a helical blade on a construction guide part: selecting a proper hydraulic pile driver 14 according to the soil property of a construction site, and rotating a solid square rod or a steel pipe 1 with a guide part welded with a helical blade to the top surface of a soil body 13 through the hydraulic pile driver 14;
step two, installing an annular soil squeezing device: after an annular steel plate 8 of the annular soil extrusion device 2 is welded and formed with a connecting steel sleeve 6, the annular soil extrusion device 2 is fixedly connected with a solid square rod or a steel pipe 1 of a guide part welding spiral blade through welding or mechanical engagement;
step three, installing the steel pipe of the extension part: inserting the extension part steel pipe 3 into the connecting steel sleeve 6, and fixedly connecting the extension part steel pipe 3 with the connecting steel sleeve 6 through a bolt; if the extension part steel pipes 3 need to be installed in sections, the adjacent two sections of extension part steel pipes 3 are fixedly connected through the connecting steel sleeves 6 and the bolts;
step four, installing a wall protection sleeve: the bottom end of the wall protection sleeve 4 is connected with a limiting steel plate 10 of the annular soil extrusion device 2, and if the wall protection sleeve 4 needs to be installed in a segmented mode along with the extension part of the steel pipe 3, two adjacent sections of the wall protection sleeves 4 are connected through a connecting plate 7;
step five, constructing the extended part of the steel pipe and the wall protection sleeve: rotating the installed extension steel pipe 3 and the wall protection sleeve 4 to a designed elevation position by using a hydraulic pile driver;
step six, cement-based grouting body construction: as shown in fig. 4, the grouting pipe 15 is placed to the bottom of the retaining wall casing 4, the prepared cement slurry is injected from the bottom through the grouting pipe 15, and the grouting pipe is lifted while grouting until the retaining wall casing 4 is filled and obviously overflows; wherein, the water cement ratio of the cement paste is 0.3-0.5, and the cement paste volume shrinkage needs to be properly supplemented;
step seven, basic connection: as shown in fig. 5, a concrete foundation 16 is poured, interface treatment of the extension part of the steel pipe 3, the retaining wall sleeve 4 and the concrete is performed, the upper part foundation is manufactured after maintenance of the screw pile foundation meets the requirement, and the connection strength meets the current technical standard of the state and the industry.
To sum up, the utility model discloses slip casting formula steel pipe screw pile forms stable pile body hole on upper portion when guaranteeing steel pipe screw pile precession construction through setting up annular crowded native device and dado sleeve pipe, then carries out the slip casting in the dado sleeve pipe, forms slip casting formula steel pipe screw pile, has increased pile body cross section on the one hand, has improved pile body stability and structural bearing capacity, and on the other hand has still formed anticorrosive sheath, has promoted the corrosion resisting property of screw pile, therefore, slip casting formula steel pipe screw pile can improve bending rigidity and structural bearing capacity on the basis of steel pipe screw pile, and can improve the corrosion resisting property of pile to a certain extent; compared with the traditional grouting pile, the grouting type steel pipe screw pile of the utility model can effectively control the volume of grouting liquid, reduce resource waste and protect the ecological environment of a construction site; compared with the traditional screw pile, the application problem in soft soil areas can be solved due to limited cost increase, the construction process is simple, and the operation is simple and convenient.
Claims (8)
1. A grouting type steel pipe spiral pile is characterized by comprising a solid square rod or a steel pipe (1) with a guide part welded with a spiral blade, an annular soil extrusion device (2), an extension part steel pipe (3), a retaining wall sleeve (4), cement-based slurry (5) and a connecting steel sleeve (6); the top end of a solid square rod or a steel pipe (1) with a helical blade welded at the guide part is fixedly connected with an annular soil extrusion device (2), and the top end of the annular soil extrusion device (2) is provided with one or more sections of extension part steel pipes (3); the bottommost section of the extension part steel pipe (3) is fixedly connected with the annular soil squeezing device (2) through a connecting steel sleeve (6) and a bolt, and two adjacent sections of the extension part steel pipes (3) are fixedly connected through the connecting steel sleeve (6) and the bolt; the outer side of each section of the extension part steel pipe (3) is provided with a corresponding protective wall sleeve (4), the bottom end of the lowest section of the protective wall sleeve (4) is connected with the top end of the annular soil squeezing device (2), and two adjacent sections of the protective wall sleeves (4) are connected through a connecting plate (7); and injecting cement-based slurry (5) between the extension part steel pipe (3) and the wall protection sleeve (4).
2. A grouting type steel pipe screw pile according to claim 1, characterized in that the top end of the solid square bar or steel pipe (1) of the leading part welded screw blade is fixedly connected with the annular soil extrusion device (2) through welding or bolts.
3. A grouting-type steel pipe screw pile according to claim 1, characterized in that the annular soil-squeezing device (2) comprises an annular steel plate (8), a soil-squeezing steel plate (9) and a limiting steel plate (10); a square hole or a round hole is formed in the center of the annular steel plate (8), a plurality of soil-squeezing steel plates (9) are arranged on the bottom surface of the annular steel plate (8), and each soil-squeezing steel plate (9) is perpendicular to the annular steel plate (8); the top surface of annular steel sheet (8) is provided with a plurality of spacing steel sheet (10), and spacing steel sheet (10) are along annular steel sheet (8) hoop symmetric arrangement all around.
4. The grouting type steel pipe screw pile according to claim 3, wherein the bottom surface of the annular steel plate (8) is provided with two soil-squeezing steel plates (9), the two soil-squeezing steel plates (9) are symmetrically arranged on two sides of the central hole of the annular steel plate (8) in parallel, and each soil-squeezing steel plate (9) is in a wedge shape with a thick top and a thin bottom.
5. A grouting type steel pipe screw pile according to claim 3 or 4, characterized in that the earth-extruding steel plate (9) is a straight plate or an S-shaped curve plate.
6. The grouting type steel pipe screw pile according to claim 1, wherein both ends of the extension steel pipe (3) and the connecting steel sleeve (6) are symmetrically perforated; the bottommost section of the extension part steel pipe (3) is inserted into the connecting steel sleeve (6), the bottommost section of the extension part steel pipe (3) is fixedly connected with the connecting steel sleeve (6) through a bolt, and the bottom end of the connecting steel sleeve (6) is fixedly connected with the top end of the annular soil squeezing device (2) through welding.
7. The grouting type steel pipe spiral pile according to claim 1, wherein a circular hole is formed in the center of the connecting plate (7), a plurality of limiting plates (11) are arranged on the top surface and the bottom surface of the connecting plate (7), and the limiting plates (11) are circumferentially and symmetrically arranged along the periphery of the connecting plate (7); the connecting plate (7) is provided with a plurality of grouting holes (12) for subsequent grouting pipes to pass through.
8. A grouting type steel pipe screw pile according to claim 1, characterized in that the retaining wall casing (4) is a steel pipe, a PVC pipe or an FRP pipe, and the connecting plate (7) and the limiting plate (11) are steel plates or FRP plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922222272.7U CN211713955U (en) | 2019-12-12 | 2019-12-12 | Slip casting type steel pipe screw pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922222272.7U CN211713955U (en) | 2019-12-12 | 2019-12-12 | Slip casting type steel pipe screw pile |
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| CN211713955U true CN211713955U (en) | 2020-10-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984139A (en) * | 2019-12-12 | 2020-04-10 | 国网江苏省电力有限公司连云港供电分公司 | Grouting type steel pipe screw pile and construction method thereof |
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2019
- 2019-12-12 CN CN201922222272.7U patent/CN211713955U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984139A (en) * | 2019-12-12 | 2020-04-10 | 国网江苏省电力有限公司连云港供电分公司 | Grouting type steel pipe screw pile and construction method thereof |
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