CN210562158U - Back-support type spiral anchor structure device - Google Patents
Back-support type spiral anchor structure device Download PDFInfo
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- CN210562158U CN210562158U CN201921185645.1U CN201921185645U CN210562158U CN 210562158 U CN210562158 U CN 210562158U CN 201921185645 U CN201921185645 U CN 201921185645U CN 210562158 U CN210562158 U CN 210562158U
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Abstract
The utility model relates to a back-support formula spiral anchor constructional device. The rear-support type spiral anchor structure device comprises a steel pipe, a plurality of spiral blades and a sleeve valve pipe; the helical blade comprises an upper helical steel plate and a lower helical steel plate which are sequentially sleeved on the steel pipe and are parallel to each other, and an expansion mechanism arranged between the upper helical steel plate and the lower helical steel plate; the expansion mechanism adopts a cloth bag or expansion blades; the expansion blade comprises an expansion blade main body movably arranged between the upper spiral steel plate and the lower spiral steel plate and a baffle arranged at the inner end of the expansion blade main body. The spiral anchor structure device can effectively reduce the penetration resistance of the spiral anchor and improve the bearing performance.
Description
Technical Field
The utility model relates to a spiral anchor technical field, concretely relates to back-brace formula spiral anchor constructional device.
Background
Spiral anchors (or called spiral piles) are used as a basic form, and certain engineering practice applications are already available in the middle of the nineteenth century. The blades are additionally arranged outside the round small-diameter steel pipe in the early stage, the spiral anchor is applied to coastal lighthouse foundation engineering mainly based on uplift, and the spiral anchor gradually extends to the applications including compression resistance, horizontal load resistance and the like, and is particularly widely applied to transmission line tower foundations, photovoltaic power station foundations and transportation pipeline foundations. The spiral anchor has the technical and economic characteristics of convenient construction, simple process, low construction noise, environmental friendliness and good economy.
From the stress mechanism, the lateral resistance of the screw anchor mainly comes from the occlusion effect of the helical screw teeth and the soil body, and the main factors influencing the ultimate bearing capacity of the screw anchor are the width of the thread (namely the width of the screw plate), the pitch and the thickness of the thread, wherein the most main factor is the width of the thread. The greater the thread width, the greater the ultimate bearing capacity of the screw anchor. However, the soil body penetration resistance born by the screw anchor during construction penetration increases with the increase of the thread width, and the larger the torque required to be applied, the higher the construction difficulty is. Therefore, the research and development of a novel spiral anchor structure device with small anchor penetration resistance and high overall uplift bearing capacity and a construction method thereof are particularly urgent.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a back-brace formula spiral anchor constructional device, this spiral anchor constructional device can effectively reduce the spiral anchor injection resistance, improves bearing capacity.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a back-support type spiral anchor structure device comprises a steel pipe, a plurality of spiral blades and a sleeve valve pipe; the helical blade comprises an upper helical steel plate and a lower helical steel plate which are sequentially sleeved on the steel pipe and are parallel to each other, and an expansion mechanism arranged between the upper helical steel plate and the lower helical steel plate; the expansion mechanism adopts a cloth bag or expansion blades; the expansion blade comprises an expansion blade main body movably arranged between the upper spiral steel plate and the lower spiral steel plate and a baffle arranged at the inner end of the expansion blade main body.
Further, the sleeve valve pipe comprises a grouting pipe, and an upper sealing ring and a lower sealing ring which are sequentially sleeved on the grouting pipe from top to bottom and are symmetrically arranged; the distance between the upper sealing ring and the lower sealing ring is 0.5-1 m; a first guniting port is formed in the grout pressing pipe between the upper sealing ring and the lower sealing ring; the number of the first guniting openings is 1-2.
Furthermore, a second guniting port is formed in the steel pipe between every two adjacent spiral blades.
Furthermore, an upper sliding block is arranged below the outer end of the upper spiral steel plate, and a lower sliding block is arranged above the outer end of the lower spiral steel plate; the top of the expansion blade main body is provided with an upper sliding groove matched with the upper sliding block, and the bottom of the expansion blade main body is provided with a lower sliding groove matched with the lower sliding block.
Furthermore, the outer end of the expansion blade main body is provided with a triangular prism-shaped lug; the longitudinal section of the lug is an acute triangle, and the angle of the included angle at the outermost side of the lug is 30-45 degrees.
Further, the outer diameter of the steel pipe is 10-20 cm, the wall thickness is 1-2 cm, the length is 2-3 m, the number of the steel pipes is a plurality of sections, and adjacent sections of the steel pipes are connected through a sleeve or welded.
Furthermore, the spiral blade surrounds a circumference on the horizontal plane, and the diameter of the spiral blade is 30-60 cm; the number of the spiral blades is 1-3; the distance between the upper spiral steel plate and the lower spiral steel plate is 2-3 cm.
Furthermore, the opening of the cloth bag is fixed at the end part of the spiral blade through a rivet, and when grouting is not performed, the cloth bag is arranged between the upper spiral steel plate and the lower spiral steel plate in a folding mode.
Furthermore, a slurry outlet is arranged on the steel pipe between the upper spiral steel plate and the lower spiral steel plate.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a slip casting realizes the effective connection of spiral steel sheet and expanding mechanism between two spiral steel sheets of helical blade, makes it form a whole, increases the screw anchor thread width simultaneously, effectively improves the whole bearing capacity of screw anchor.
(2) The utility model discloses a thick liquid segregation has effectively been avoided to sleeve valve pipe slip casting mode to improve the efficiency of construction, practiced thrift the cost.
(3) The utility model has the advantages of convenient construction, simple process, low construction noise, environmental friendliness and good economical efficiency.
Drawings
Fig. 1 is a schematic structural view of a middle rear-support type spiral anchor structure device of the utility model;
FIG. 2 is a comparison diagram of the state of the middle-rear supporting type spiral anchor structure device before and after grouting;
FIG. 3 is a schematic view of the structure of the expansion blade;
FIG. 4 is a comparison of the state of the expansion mechanism before and after grouting in the first embodiment;
FIG. 5 is a comparison of the state of the expanding means before and after grouting in the second embodiment.
Wherein:
1. the mortar injection device comprises a mortar injection pipe, 2, an upper sealing ring, 3, a first mortar injection port, 4, a lower sealing ring, 5, a steel pipe, 6, an upper spiral steel plate, 61, an upper sliding block, 7, an expansion blade, 71, an expansion blade main body, 72, a baffle, 73, a convex block, 74, an upper sliding groove, 8, a lower spiral steel plate, 81, a lower sliding block, 9, a second mortar injection port, 10, mortar, 11, a cloth bag, 12 and an expansion mechanism.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
example one
The back-support type spiral anchor structure device shown in fig. 1-2 comprises a steel pipe 5, a plurality of spiral blades and a sleeve valve pipe; the helical blade comprises an upper helical steel plate 6 and a lower helical steel plate 8 which are sequentially sleeved on the steel pipe 5 and are parallel to each other, and an expansion mechanism 12 which is arranged between the upper helical steel plate 6 and the lower helical steel plate 8.
Further, the sleeve valve pipe comprises a grouting pipe 1, and an upper sealing ring 2 and a lower sealing ring 4 which are sequentially sleeved on the grouting pipe 1 from top to bottom and are symmetrically arranged; the distance between the upper sealing ring 2 and the lower sealing ring 4 is 0.5-1 m; a grout spraying opening I3 is formed in the grout pressing pipe 1 between the upper sealing ring 2 and the lower sealing ring 4; the number of the first guniting openings 3 is 1-2. And a second guniting port 9 is formed in the steel pipe 5 between the adjacent helical blades. The upper sealing ring 2 and the lower sealing ring 4 both comprise 2-3 sealing rings, the inner end parts of the sealing rings are rubber rings, and the outer diameters of the rubber rings are equal to the inner diameter of the steel pipe. The upper sealing ring 2 and the lower sealing ring 4 both play a role in isolating slurry, and slurry flows outwards from the first slurry spraying port 3 into an annular cavity enclosed by the steel pipe 5 between the upper sealing ring 2 and the lower sealing ring 4 and the grouting pipe 1 after entering the inner cavity of the grouting pipe 1 from the opening at the upper end of the grouting pipe 1.
Further, the outer diameter of the steel pipe 5 is 10-20 cm, the wall thickness is 1-2 cm, the length is 2-3 m, the number of the steel pipes 5 is a plurality of sections, and the adjacent sections of the steel pipes 5 are connected through a sleeve or welded.
Furthermore, the projection of the spiral blade on the horizontal plane encloses a circumference, and the diameter of the circumference is 30-60 cm; the number of the helical blades is 1-3.
As shown in fig. 3, the expansion mechanism employs expansion blades 7; the expansion blade 7 comprises an expansion blade main body 71 movably installed between the upper spiral steel plate 6 and the lower spiral steel plate 8 and a baffle plate 72 arranged at the inner end of the expansion blade main body 71. The thickness of the baffle 72 is 0.5-1 mm smaller than the gap between the upper spiral steel plate and the lower spiral steel plate. An upper sliding block 61 is arranged below the outer end of the upper spiral steel plate 6, and an upper sliding block 81 is arranged above the outer end of the lower spiral steel plate 8; the top of the expansion blade body 71 is provided with an upper sliding groove 74 corresponding to the upper sliding block 61, and the bottom is provided with a lower sliding groove corresponding to the lower sliding block 81. The upper slider 61 is slidably engaged with the upper chute 74, and the lower slider 81 is slidably engaged with the lower chute. By providing the upper slider 61 and the upper slide groove, and the lower slider 81 and the lower slide groove, the expansion blade 7 slides in the gap between the upper and lower spiral steel plates under the impact of the slurry. The baffle 72 is used for limiting the flowing of the grout only between the upper spiral steel plate and the lower spiral steel plate and avoiding the leakage of the grout from a gap between the upper spiral steel plate and the lower spiral steel plate in the grouting process of the steel pipe 5, and plays a limiting role and prevents the expansion blade 7 from falling off from the gap between the upper spiral steel plate and the lower spiral steel plate. An upper sliding groove 74 and a lower sliding groove for limiting the moving direction of the expansion blades. The outer end of the expansion blade main body 71 is provided with a triangular prism-shaped lug 73; the longitudinal section of the convex block 73 is an acute triangle, and the angle of the included angle at the outermost side is 30-45 degrees. When no grouting is carried out in the steel pipe 5, the expansion blade main body 71 is positioned between the upper spiral steel plate and the lower spiral steel plate, the lug 73 is positioned on the outer side of the outer edges of the upper spiral steel plate and the lower spiral steel plate, and the expansion blade main body works as the end part of the spiral blade at the moment to prevent silt from entering the steel pipe; when grouting is carried out in the steel pipe 5, the outer end of the triangular prism-shaped lug 73 is sharp and pointed, so that the soil body can be conveniently cut, and the spiral anchor device can smoothly penetrate into the soil body. The distance between the upper spiral steel plate 6 and the lower spiral steel plate 8 is 2-3 cm. A slurry outlet is arranged on the steel pipe 5 between the upper spiral steel plate 6 and the lower spiral steel plate 8. The shape of expansion blade 7 is fan-shaped, and the angle is 60 ~ 90 degrees, and the width is one third to one half of upper spiral steel plate 6 or lower spiral steel plate 8. The quantity of expansion blade 7 is a plurality of, and 5 ~ 10mm at the interval of spiral steel sheet about last leads to long arranging, can ensure like this that every expansion blade is pushed away by the thick liquid after, the baffle of each expansion blade can enclose into the round, does not interfere each other, and can just in time plug up the gap between the outer tip of spiral steel sheet and spiral steel sheet down.
As shown in fig. 4, the construction method of the rear-support-type spiral anchor structure device in the embodiment includes the following steps:
before construction, the steel pipe 5, the spiral blades and the expansion mechanism 12 are manufactured according to design requirements, in the factory prefabrication process, the expansion mechanism 12 is installed on the spiral blades, and then the spiral blades are welded on the corresponding steel pipe.
(1) And (3) soil body penetration: the first section of steel pipe provided with the helical blades is penetrated into the soil body mechanically or manually, a plurality of sections of steel pipes provided with the helical blades are sequentially connected above the first section of steel pipe in a welding or sleeve connection mode, and the steel pipes are continuously penetrated into the soil body.
(2) Grouting sleeve raft pipes: and after the steel pipe provided with the helical blades reaches the designed depth, the sleeve valve pipe enters the steel pipe from the opening of the uppermost steel pipe, and the sleeve valve pipe moves downwards to the designed depth to inject grout into the grouting pipe. The slurry is cement slurry or high polymer material slurry. When the sleeve valve pipe is inserted into the steel pipe, oil is coated around the rubber ring, so that the sealing performance can be improved, and the up-and-down movement of the sleeve valve pipe can be facilitated.
(3) Expanding the expanding mechanism: the grout firstly enters the steel pipe from the grout spraying port I and then enters a gap between the upper spiral steel plate and the lower spiral steel plate from the grout outlet, and the expansion mechanism arranged in the gap is driven to move outwards, so that the radius of the spiral blade is increased. At the moment, the slurry of the expansion blade moves outwards under the driving of the slurry of the expansion blade and the sliding fit of the upper sliding block and the upper sliding groove as well as the lower sliding block and the lower sliding groove until the baffle is contacted with the upper sliding block and the lower sliding block. After grouting is completed, the helical blade and the expansion blade extending out of the helical blade are 1.2-1.5 times as long as the original length, the thread width of the helical anchor is increased, and the overall bearing performance of the helical anchor is effectively improved.
(4) And (3) spraying: and moving the grouting position of the sleeve valve pipe to enable the grout to flow out of the soil body on the outer side of the steel pipe through a second grout spraying opening between every two adjacent spiral blades, and performing grout spraying treatment on the soil body around the steel pipe.
(5) And finally, moving out the sleeve valve pipe, completing the construction of the rear support type spiral anchor, and performing injection and grouting construction on the second spiral anchor.
Example two
As shown in fig. 5, the expansion mechanism is a cloth bag. The opening of the cloth bag is fixed at the end part of the helical blade through a rivet. And glue is spread between the opening of the cloth bag and the helical blade for leakage prevention treatment. When grouting is not performed, the cloth bag is arranged between the upper spiral steel plate and the lower spiral steel plate in a folding mode. After grouting, the slurry flows into the cloth bag through a gap between the upper spiral steel plate and the lower spiral steel plate to prop the cloth bag open, and after the cloth bag is propped open, the radius of the spiral blade and the radius of the cloth bag are 1.2-1.5 times that of the spiral blade.
As shown in fig. 5, the construction method of the rear-support-type spiral anchor structure device in this embodiment includes the following steps:
before construction, the steel pipe 5, the spiral blades and the expansion mechanism 12 are manufactured according to design requirements, in the factory prefabrication process, the expansion mechanism 12 is installed on the spiral blades, and then the spiral blades are welded on the corresponding steel pipe.
(1) And (3) soil body penetration: the first section of steel pipe provided with the helical blades is penetrated into the soil body mechanically or manually, a plurality of sections of steel pipes provided with the helical blades are sequentially connected above the first section of steel pipe in a welding or sleeve connection mode, and the steel pipes are continuously penetrated into the soil body.
(2) Grouting sleeve raft pipes: and after the steel pipe provided with the helical blades reaches the designed depth, the sleeve valve pipe enters the steel pipe from the opening of the uppermost steel pipe, and the sleeve valve pipe moves downwards to the designed depth to inject grout into the grouting pipe. The slurry is cement slurry or high polymer material slurry. When the sleeve valve pipe is inserted into the steel pipe, oil is coated around the rubber ring, so that the sealing performance can be improved, and the up-and-down movement of the sleeve valve pipe can be facilitated.
(3) Expanding the expanding mechanism: the slurry enters the steel pipe from the first slurry spraying port, enters the gap between the upper spiral steel plate and the lower spiral steel plate from the slurry outlet, and drives the cloth bag arranged in the gap to move outwards until the cloth bag filled with the slurry is stretched in the space outside the periphery of the spiral blade, so that the radius of the spiral blade is increased. After the radius of the helical blade is enlarged, the thread width of the helical anchor is increased equivalently, and the integral bearing performance of the helical anchor is further effectively improved.
(4) And (3) spraying: and moving the grouting position of the sleeve valve pipe to enable the grout to flow out of the soil body on the outer side of the steel pipe through a second grout spraying opening between every two adjacent spiral blades, and performing grout spraying treatment on the soil body around the steel pipe.
(5) And finally, moving out the sleeve valve pipe, completing the construction of the rear support type spiral anchor, and performing injection and grouting construction on the second spiral anchor.
The other steps are the same as those of the first embodiment.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (9)
1. The utility model provides a back support formula spiral anchor constructional device which characterized in that: comprises a steel pipe, a plurality of helical blades and a sleeve valve pipe; the helical blade comprises an upper helical steel plate and a lower helical steel plate which are sequentially sleeved on the steel pipe and are parallel to each other, and an expansion mechanism arranged between the upper helical steel plate and the lower helical steel plate; the expansion mechanism adopts a cloth bag or expansion blades; the expansion blade comprises an expansion blade main body movably arranged between the upper spiral steel plate and the lower spiral steel plate and a baffle arranged at the inner end of the expansion blade main body.
2. A rear support helical anchor construction device according to claim 1, wherein: the sleeve valve pipe comprises a grouting pipe, and an upper sealing ring and a lower sealing ring which are sequentially sleeved on the grouting pipe from top to bottom and are symmetrically arranged; the distance between the upper sealing ring and the lower sealing ring is 0.5-1 m; a first guniting port is formed in the grout pressing pipe between the upper sealing ring and the lower sealing ring; the number of the first guniting openings is 1-2.
3. A rear support helical anchor construction device according to claim 1, wherein: and a second guniting port is formed in the steel pipe between the adjacent helical blades.
4. A rear support helical anchor construction device according to claim 1, wherein: an upper sliding block is arranged below the outer end of the upper spiral steel plate, and a lower sliding block is arranged above the outer end of the lower spiral steel plate; the top of the expansion blade main body is provided with an upper sliding groove matched with the upper sliding block, and the bottom of the expansion blade main body is provided with a lower sliding groove matched with the lower sliding block.
5. A rear support helical anchor construction device according to claim 1, wherein: the outer end of the expansion blade main body is provided with a triangular prism-shaped lug; the longitudinal section of the lug is an acute triangle, and the angle of the included angle at the outermost side of the lug is 30-45 degrees.
6. A rear support helical anchor construction device according to claim 1, wherein: the outer diameter of the steel pipe is 10-20 cm, the wall thickness is 1-2 cm, the length is 2-3 m, the number of the steel pipes is a plurality of sections, and adjacent sections of the steel pipes are connected through a sleeve or welded.
7. A rear support helical anchor construction device according to claim 1, wherein: the spiral blades surround a circle on the horizontal plane, and the diameter of the spiral blades is 30-60 cm; the number of the spiral blades is 1-3; the distance between the upper spiral steel plate and the lower spiral steel plate is 2-3 cm.
8. A rear support helical anchor construction device according to claim 1, wherein: the opening of the cloth bag is fixed at the end part of the spiral blade through a rivet, and when grouting is not performed, the cloth bag is arranged between the upper spiral steel plate and the lower spiral steel plate in a folding mode.
9. A rear support helical anchor construction device according to claim 1, wherein: a slurry outlet is arranged on the steel pipe between the upper spiral steel plate and the lower spiral steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921185645.1U CN210562158U (en) | 2019-07-26 | 2019-07-26 | Back-support type spiral anchor structure device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921185645.1U CN210562158U (en) | 2019-07-26 | 2019-07-26 | Back-support type spiral anchor structure device |
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| CN210562158U true CN210562158U (en) | 2020-05-19 |
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| CN201921185645.1U Active CN210562158U (en) | 2019-07-26 | 2019-07-26 | Back-support type spiral anchor structure device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438983A (en) * | 2019-07-26 | 2019-11-12 | 国网安徽省电力有限公司建设分公司 | A kind of back brace formula Screw Anchor constructional device and its construction method |
-
2019
- 2019-07-26 CN CN201921185645.1U patent/CN210562158U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438983A (en) * | 2019-07-26 | 2019-11-12 | 国网安徽省电力有限公司建设分公司 | A kind of back brace formula Screw Anchor constructional device and its construction method |
| CN110438983B (en) * | 2019-07-26 | 2024-02-20 | 国网安徽省电力有限公司建设分公司 | Back-supporting type spiral anchor structure device and construction method thereof |
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