CN210315518U - Steel pipe micro pile - Google Patents
Steel pipe micro pile Download PDFInfo
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- CN210315518U CN210315518U CN201920707979.4U CN201920707979U CN210315518U CN 210315518 U CN210315518 U CN 210315518U CN 201920707979 U CN201920707979 U CN 201920707979U CN 210315518 U CN210315518 U CN 210315518U
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- steel pipe
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- rubber membrane
- pile
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Abstract
The utility model provides a steel pipe micro pile, which comprises a steel pipe, an inner slurry layer positioned inside the steel pipe and an outer slurry layer positioned outside the steel pipe, wherein the steel pipe comprises a common steel pipe section, an anchoring section and an embedded end which are sequentially connected from top to bottom; the anchoring section is provided with a grouting hole and a clamping throat for assembling a rubber membrane, the rubber membrane is sleeved on the outer wall of the grouting hole and used for sealing the grouting hole, and cement slurry is filled in the rubber membrane to form a convex structure; the embedded end is arranged at the lowest end of the steel pipe and is used for being embedded into the foundation stratum. The utility model provides a steel pipe miniature pile is through inlaying solid end embedding basement rock section, is full of the evagination structure that the thick liquid formed in the outer thick liquid layer of steel pipe miniature pile and the rubber membrane, and the three combines together, has improved holistic resistance to compression of steel pipe miniature pile, resistance to plucking bearing capacity greatly, can effectively be used for soft soil foundation to consolidate and the anti-skidding protection of side slope.
Description
Technical Field
The utility model relates to a civil engineering technical field especially relates to a steel pipe micro pile.
Background
The steel pipe micro pile is a cast-in-place pile which is formed by drilling, inserting a steel pipe, grouting and the like, wherein the diameter of the steel pipe micro pile is less than 300mm, the slenderness ratio of the steel pipe micro pile is usually more than 30. The steel pipe micro pile has the following advantages in soft soil foundation reinforcement engineering and slope anti-slip protection engineering: the construction is convenient and rapid, and very safe, the used apparatus is small while constructing, can apply to all kinds of rock masses, especially when the large-scale machinery can't enter the field, the function of the miniature pile of steel tube is more obvious; the pile hole has small aperture, so that the additional stress generated on the existing building foundation and foundation soil is small, the safety of the existing structure is not influenced, and meanwhile, the noise is low during construction, so that the method is suitable for construction in a zone with strictly controlled noise; the pile arrangement form is flexible, a vertical or inclined arrangement mode can be adopted according to specific engineering requirements, and in addition, the pile arrangement mode can be crossed or arranged in a net shape; the steel pipe micro pile group system has good bearing capacity in the aspects of compression resistance, pulling resistance and axial load resistance. The steel pipe micro-pile has unique advantages and is widely applied to geotechnical engineering practice.
At present, the construction of the steel pipe micro pile in some soft soil foundations by adopting the traditional grouting mode has a not negligible problem: because the soft soil foundation intensity is lower, the bottom of steel pipe micro pile appears the thick liquid phenomenon of running easily, leads to the grouting volume uncontrollable, causes unnecessary economic loss. The method specifically comprises the following steps: the existing steel pipe micro-pile is mostly provided with a grouting opening on a steel pipe, so that grouting slurry can flow from the inside to the outside of the pipe through the grouting opening on the steel pipe, and the slurry enters a soil layer outside the pile through the wall of a drilled hole; if the soil layer outside the pile is broken and has high permeability, the grout can penetrate into the surrounding stratum excessively, so that the actual grouting amount is far larger than the designed grouting amount. In addition, the compaction effect of the grouting body at the bottom of the traditional steel pipe micro pile on the surrounding soil body is limited, so that the whole compressive, uplift and axial load resistance of the steel pipe micro pile is limited.
A novel technology of a steel pipe micro pile is urgently needed in the industry.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a miniature stake of steel pipe to because weak soil foundation intensity is lower among the solution prior art, the miniature stake of steel pipe appears running thick liquid phenomenon easily, and the current miniature stake of steel pipe is to the crowded compact limited technical problem who acts on of the soil body on every side.
In order to achieve the purpose, the utility model provides a steel pipe micro pile, which comprises a steel pipe, an inner slurry layer positioned inside the steel pipe and an outer slurry layer positioned outside the steel pipe, wherein the steel pipe comprises a common steel pipe section, an anchoring section and an embedding end which are sequentially connected from top to bottom;
the outer grout layer comprises a sealing section positioned on the outer side of the upper part of the steel pipe and a grout section positioned below the sealing section;
the inner wall of the upper end of the common steel pipe section is provided with a sleeve female wire for sealing;
the anchoring section is provided with a grouting hole and a clamping throat for assembling a rubber membrane, the rubber membrane is sleeved on the outer wall of the grouting hole and used for sealing the grouting hole, and cement slurry is filled in the rubber membrane to form a convex structure;
the lower end of the embedded end is provided with a sealing plate, and the sealing plate is provided with a through hole which is used for penetrating a grouting pipe for grouting an outer grout layer; the embedded end is arranged at the lowest end of the steel pipe and is used for being embedded into the foundation stratum.
Furthermore, the two ends of the rubber membrane are bound in the throat of the steel pipe through a stainless steel binding belt.
Further, the sealing section is a cement mortar layer.
Furthermore, the stainless steel ribbon is of a self-locking structure; the throat width of the anchoring section is 3-5 mm, and the depth is 1 mm.
Furthermore, at least one group of grouting hole groups are formed in the anchoring section from top to bottom, and each grouting hole group comprises at least one grouting hole; the distance between two adjacent groups of grouting hole groups is 50-80 cm, and a plurality of grouting holes in one group of grouting hole groups are symmetrically arranged around the central axis of the steel pipe.
Further, the rubber membrane is a chloroprene rubber membrane; the section of the convex structure is a circular ring, and the ring width of the convex structure is 1.5-2.0 times of that of the outer slurry layer.
Furthermore, waterproof glue is coated at the joint gap between the rubber membrane and the anchoring section.
Furthermore, the diameter of the steel pipe micro-pile is 150 mm-250 mm, the thickness is 3 mm-5 mm, and the length is 5-20 m.
Further, the rubber membrane is made of natural rubber or chloroprene rubber.
The utility model discloses following beneficial effect has:
(1) the utility model provides a pair of both ends of steel pipe micro pile lower part rubber membrane are through from locking-type stainless steel ribbon ligature in the card larynx of steel pipe, and waterproof type glue has been paintd to the joint gap department of rubber membrane and steel pipe simultaneously, can guarantee that the slip casting thick liquid in the steel pipe does not flow outward to avoid the problem of stake bottom running thick liquid, the slip casting volume is controllable, greatly reduced the slip casting cost.
(2) The utility model provides a pair of steel pipe miniature pile carries out outside water injection mud of steel pipe earlier and forms outer thick liquid layer, and the cement paste body on outer thick liquid layer combines through effects such as infiltration, splitting, packing and crowded density with the outer soil layer of stake, and solidification pile body sediment and stake side earth increase stake side frictional resistance and pile tip bearing capacity. And then grouting the steel pipe to form an inner slurry layer, and after the rubber film at the lower part of the steel pipe is filled with slurry to form an outward convex structure, increasing the side wall frictional resistance of the pile body by extruding the surrounding soil body, thereby improving the overall compression resistance, pulling resistance and axial load resistance of the steel pipe micro pile. Meanwhile, the embedded end of the steel pipe micro pile is embedded into the bedrock section, and the outer slurry layer of the steel pipe micro pile and the rubber film are filled with the outward protruding structure formed by slurry, so that the compressive resistance and the pulling resistance bearing capacity of the whole steel pipe micro pile can be greatly improved, and the steel pipe micro pile is effectively used for soft soil foundation reinforcement and slope anti-slip protection.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic structural view of a steel pipe micro pile according to a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of a steel pipe micropile according to a preferred embodiment of the present invention;
FIG. 3 is a construction drawing of a steel pipe micro pile according to a preferred embodiment of the present invention;
FIG. 4 is a cross-sectional view of the steel pipe micro pile according to the preferred embodiment of the present invention after construction;
the method comprises the following steps of 1-a steel pipe, 2-a rubber membrane, 3-a throat, 4-a self-locking stainless steel ribbon, 5-a grouting hole, 6-an embedded end, 7-an external graph structure, 8-an internal grouting layer, 9-an external grouting layer, 10-a grouting pipe, 11-an exhaust pipe, 12-a sleeve female wire, 13-a cement mortar layer, 14-an external pile soil layer and 15-a second grouting pipe.
Detailed Description
The embodiments of the invention will be described in detail hereinafter with reference to the accompanying drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Referring to fig. 1 to 2, the steel pipe micro pile comprises a steel pipe 1, an inner slurry layer 8 located inside the steel pipe, and an outer slurry layer 9 located outside the steel pipe, wherein the steel pipe 1 comprises a common steel pipe section, an anchoring section and an embedding end which are sequentially connected from top to bottom.
The outer grout layer 9 comprises a sealing section positioned on the outer side of the upper part of the steel pipe and a grout section positioned below the sealing section. Specifically, the sealing section is a cement mortar layer 13. And a sleeve female wire 12 for sealing is arranged on the inner wall of the upper end of the common steel pipe section. The sleeve female screw can also be replaced by a rubber plug with a polished rough surface, and the effects of mainly serving for secondary grouting and preventing cement grout from overflowing are realized, the opening of the steel pipe is plugged, a hole is formed in the rubber plug, and the grouting pipe and the exhaust pipe penetrate through the rubber plug.
Be equipped with grouting hole 5 and the card larynx 3 that is used for assembling rubber membrane 2 on the anchor section, rubber membrane cover 2 is established be used for sealing on grouting hole 5's the outer wall grouting hole 5, just the inside of rubber membrane 2 is filled cement and is formed evagination structure 7. Specifically, the rubber membrane 2 is bound in the throat 3 of the steel pipe through a self-locking stainless steel binding belt 4. Waterproof glue is coated at the joint gap between the rubber membrane 2 and the anchoring section, so that slurry leakage during grouting can be prevented, grouting amount is controllable, and grouting cost is saved.
The lower end of the embedded end is provided with a sealing plate, and the sealing plate is provided with a through hole which is used for penetrating a grouting pipe for grouting an outer grout layer; the embedded end is arranged at the lowest end of the steel pipe and is used for being embedded into the foundation layer, and the depth of the embedded foundation layer is determined according to the design depth.
The diameter of the steel pipe micro pile is 150 mm-250 mm, the thickness is 3 mm-5 mm, and the length is 5-20 m. The width of the throat clamping part 3 arranged on the anchoring section is 3-5 mm, the depth of the throat clamping part is 1mm, the width and the depth of the throat clamping part 3 can be determined according to specific engineering conditions, but the mechanical strength of the steel pipe cannot be greatly influenced due to the fact that the width and the depth of the throat clamping part are too large. The anchoring section is provided with at least one group of grouting hole groups from top to bottom, and each grouting hole group comprises at least one grouting hole; the distance between two adjacent groups of grouting hole groups is 50-80 cm, and a plurality of grouting holes in one group of grouting hole groups are symmetrically arranged around the central axis of the steel pipe. The cross section of the convex structure 7 is a circular ring, and the ring width of the convex structure is 1.5-2.0 times of that of the outer slurry layer 9. The convex structure can squeeze the surrounding soil to increase the frictional resistance between the bottom of the pile and the side wall of the surrounding soil.
The rubber membrane is a chloroprene rubber membrane with high tensile strength, good wear resistance and good tear resistance. The length of the rubber membrane depends on the length of the convex structure in the design. Referring to fig. 3, the concrete construction method of the steel pipe micro pile of the present invention is: firstly, the preparation work of the ground micro pile is carried out, grouting holes 5 are formed in the steel pipe at certain intervals according to the design requirements of the steel pipe micro pile, then the clamping throat 3 is arranged at the position where the rubber membrane 2 needs to be bound, the two ends of the rubber membrane 2 are bound at the position of the clamping throat 3 through the self-locking stainless steel binding belt 4, and waterproof glue is coated at the connecting gap between the rubber membrane 2 and the steel pipe 1 to prevent grout leakage. Then, the first grouting pipe 10 is placed to the bottom of the steel pipe, a through hole which just enables the first grouting pipe to pass through is formed in the sealing plate, and then the sealing plate penetrates through the first grouting pipe and is welded to the bottom of the steel pipe to form a steel pipe bottom sealing plate; and then, the second grouting pipe is placed to be close to the bottom of the steel pipe, the sealing sleeve female wire penetrates through the first grouting pipe and the second grouting pipe to seal the top end of the steel pipe, and a through hole for the first grouting pipe and the second grouting pipe to pass through is formed in the sealing sleeve female wire. And then, drilling, namely, drilling to a designed elevation in a construction site by adopting ground drilling equipment according to design requirements, and after the drilling is finished, removing residual deficient soil in the hole. Then, the steel pipe is lowered and fixed, the steel pipe 1 is lowered into a drilled hole, the exhaust pipe 11 is lowered out of the steel pipe, the depth of the steel pipe is about half of the length of the steel pipe 1, and the steel pipe 1 and the exhaust pipe 11 are fixed through ground positioning equipment. And finally, grouting, namely, firstly, injecting grout into the bottom of the drilled hole through the first grouting pipe 10, and filling the area between the outside of the steel pipe and the hole from bottom to top, wherein the grouting pressure is determined by combining the surrounding soil conditions. For example, when grouting a steel pipe micro pile, the grouting pressure is usually 0.2-0.6MPa, the grouting pressure is based on the principle that cement slurry can be smoothly injected, and when the porosity of a soil layer outside a drilled hole is large and cracks develop, the slurry can easily enter the stratum, so that the lower grouting pressure is selected; when the porosity of the soil layer outside the drilled hole is small and the permeability coefficient of the soil layer is small, the slurry can be injected into the stratum only by adopting larger pressure grouting as much as possible. Under the grouting pressure of the grout injected into the stratum, the grouting is performed by adopting smaller pressure as far as possible, so that the possibility of grout leakage on the ground is reduced. When fresh grout overflows from the drilling hole at the top end of the pile, the grouting of the first grouting pipe 10 is stopped, and the sealing is performed by cement mortar 13. And then grouting in a second grouting pipe 15 to enable the cement grout to sequentially and upwards fill the interior of the steel pipe from the bottom of the steel pipe. Grout in the anchoring section enters the rubber film 2 through the grouting holes, is filled with the whole rubber film, and extrudes surrounding soil to form an ellipsoidal convex structure 7. And stopping grouting after the steel pipe is filled with cement slurry, and taking out the first grouting pipe, the second grouting pipe and the exhaust pipe. Through the process, the construction work of the steel pipe micro pile is completed. The utility model discloses the cement mortar seals to be relevant with the construction process of steel pipe micropile, and the steel pipe micropile is the secondary pressure slip casting, and slip casting pressure can reach 2MPa sometimes, seals with cement mortar and is difficult to reach so big pressure. The sealing sleeve female wire is mainly used for sealing cement grout inside the steel pipe and secondary grouting service. Meanwhile, the cement slurry is injected into the outer part of the steel pipe firstly, and then the inner part of the steel pipe is subjected to secondary grouting, so that the cement slurry can be injected into an ellipsoidal cement structure body formed in the rubber film through the grouting holes, and the side wall frictional resistance of the pile body is increased by extruding the surrounding soil body.
The utility model provides a pair of steel pipe is miniature carry out outside water injection mud of steel pipe earlier and forms outer thick liquid layer, and the cement paste body on outer thick liquid layer combines through functions such as infiltration, splitting, packing and crowded close with the outer soil layer of stake, and solidification pile body sediment and stake side earth increase stake side frictional resistance and stake end bearing capacity. And then grouting the steel pipe to form an inner slurry layer, and after the rubber film at the lower part of the steel pipe is filled with slurry to form an ellipsoidal convex structure, extruding the surrounding stratum to increase the side wall friction of the pile body, so that the overall compression resistance, pulling resistance and axial load resistance of the steel pipe micro pile are improved. Meanwhile, the embedded end of the steel pipe micro pile is embedded into the bedrock section, and the outer grout layer of the steel pipe micro pile and the rubber film are filled with grout to form an outward convex structure.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A steel pipe micro pile is characterized by comprising a steel pipe, an inner slurry layer positioned inside the steel pipe and an outer slurry layer positioned outside the steel pipe, wherein the steel pipe comprises a common steel pipe section, an anchoring section and an embedding end which are sequentially connected from top to bottom;
the outer grout layer comprises a sealing section positioned on the outer side of the upper part of the steel pipe and a grout section positioned below the sealing section;
the inner wall of the upper end of the common steel pipe section is provided with a sleeve female wire for sealing;
the anchoring section is provided with a grouting hole and a clamping throat for assembling a rubber membrane, the rubber membrane is sleeved on the outer wall of the grouting hole and used for sealing the grouting hole, and cement slurry is filled in the rubber membrane to form a convex structure;
the lower end of the embedded end is provided with a sealing plate, and the sealing plate is provided with a through hole which is used for penetrating a grouting pipe for grouting an outer grout layer; the embedded end is arranged at the lowest end of the steel pipe and is used for being embedded into the foundation stratum.
2. The steel pipe micropile of claim 1, wherein both ends of said rubber membrane are bound in the throat of the steel pipe by stainless steel ties.
3. A steel pipe micropile according to claim 1, wherein said seal section is a cement mortar layer.
4. The steel pipe micropile of claim 2, wherein said stainless steel tie is of a self-locking type structure; the throat width of the anchoring section is 3-5 mm, and the depth is 1 mm.
5. The steel pipe micro pile of claim 1, wherein the anchoring section is provided with at least one grouting hole group from top to bottom, and the grouting hole group comprises at least one grouting hole; the distance between two adjacent groups of grouting hole groups is 50-80 cm, and a plurality of grouting holes in one group of grouting hole groups are symmetrically arranged around the central axis of the steel pipe.
6. The steel pipe micropile of claim 1, wherein said rubber membrane is a neoprene membrane; the section of the convex structure is a circular ring, and the ring width of the convex structure is 1.5-2.0 times of that of the outer slurry layer.
7. The steel pipe micropile of claim 1, wherein a waterproof glue is applied to a connecting gap between the rubber membrane and the anchoring section.
8. The steel pipe micro-pile according to claim 1, wherein the steel pipe of the steel pipe micro-pile has a diameter of 150mm to 250mm, a thickness of 3mm to 5mm, and a length of 5m to 20 m.
9. The steel pipe micropile of claim 1, wherein the rubber membrane is made of natural rubber or neoprene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920707979.4U CN210315518U (en) | 2019-05-17 | 2019-05-17 | Steel pipe micro pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920707979.4U CN210315518U (en) | 2019-05-17 | 2019-05-17 | Steel pipe micro pile |
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| Publication Number | Publication Date |
|---|---|
| CN210315518U true CN210315518U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920707979.4U Expired - Fee Related CN210315518U (en) | 2019-05-17 | 2019-05-17 | Steel pipe micro pile |
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| CN (1) | CN210315518U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110130324A (en) * | 2019-05-17 | 2019-08-16 | 中南大学 | A kind of micro-steel pile and its construction method |
| CN113174927A (en) * | 2021-03-31 | 2021-07-27 | 山东高速岩土科技有限公司 | Reinforcement construction method of micro pile for soft soil foundation |
-
2019
- 2019-05-17 CN CN201920707979.4U patent/CN210315518U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110130324A (en) * | 2019-05-17 | 2019-08-16 | 中南大学 | A kind of micro-steel pile and its construction method |
| CN113174927A (en) * | 2021-03-31 | 2021-07-27 | 山东高速岩土科技有限公司 | Reinforcement construction method of micro pile for soft soil foundation |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200414 Termination date: 20210517 |