CN215801698U - A micro pile structure for accumulation layer landslide is administered - Google Patents

A micro pile structure for accumulation layer landslide is administered Download PDF

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Publication number
CN215801698U
CN215801698U CN202120903153.2U CN202120903153U CN215801698U CN 215801698 U CN215801698 U CN 215801698U CN 202120903153 U CN202120903153 U CN 202120903153U CN 215801698 U CN215801698 U CN 215801698U
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pile
micro
landslide
prestressed anchor
grouting
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CN202120903153.2U
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张玉
孟天一
刘瑾
赵阳
许晨阳
范特佳
叶晟
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Xian Technological University
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Xian Technological University
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Abstract

The utility model discloses a micro pile structure for managing the landslide of a stacking layer, which comprises: the bottom of each micro pile is used for being inserted into the sliding bed, and the arrangement mode of each micro pile is that a plurality of rows are arranged in parallel and staggered in each row; each micropile includes: the pile body is a steel pipe concrete pile; the grouting steel sleeve is coaxially sleeved on the outer side of the lower part of the pile body, and a plurality of through holes are uniformly distributed on the circumferential surface of the grouting steel sleeve and are communicated with the interior of the pile body; each prestressed anchor rod is obliquely inserted from the top of the pile body close to the slope surface of the sliding body and inserted into the sliding bed; the I-shaped steel is used for connecting the prestressed anchor rods on all the micro piles in the same row; and the crown beam is cast and connected with the top of each micro pile. The problem of among the prior art miniature pile crowd probably lead to pile crowd to destroy because of the too big shear force that the landslide produced is solved.

Description

A micro pile structure for accumulation layer landslide is administered
Technical Field
The utility model belongs to the technical field of landslide control, and particularly relates to a micro-pile structure for treatment of landslide of a stacking layer.
Background
With the rapid development of economic construction and the increasing demand of social life, more and more large facilities such as hydraulic engineering, municipal engineering, roads, bridges and the like need to be built, and a large number of problems of slope engineering stability control become the focus of attention in the engineering construction field. Accordingly, landslide control techniques and measures have been developed rapidly, and more control techniques and measures have played an important role in the field of landslide control. The micro-pile is one of important landslide control technical measures and is widely applied to landslide control engineering practice. However, the existing micro pile group has a certain protection effect, and the pile group can be damaged due to excessive shearing force generated by landslide.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a micro pile structure for managing landslide of a stacking layer, and the micro pile structure is used for solving the problem that a pile group is damaged due to excessive shearing force generated by landslide in the prior art.
The utility model adopts the following technical scheme: a micro-pile structure for use in pile landslide remediation, comprising:
the bottom of each micro pile is used for being inserted into the sliding bed, and the arrangement mode of each micro pile is that a plurality of rows are arranged in parallel and staggered in each row; each micropile includes:
the pile body is a steel pipe concrete pile;
the grouting steel sleeve is coaxially sleeved on the outer side of the lower part of the pile body, and a plurality of through holes are uniformly distributed on the circumferential surface of the grouting steel sleeve and are communicated with the interior of the pile body;
the prestressed anchor rods are arranged on a row of miniature piles close to the slope surface of the sliding body, and each prestressed anchor rod is obliquely inserted from the top of each pile body and inserted into the sliding bed;
the I-shaped steel is used for connecting all the prestressed anchor rods;
the crown beam is cast and connected with the top of each micro pile;
each micro pile is used for high-pressure grouting through the top of the micro pile and then is discharged through a grouting steel sleeve so as to reinforce the connection between the micro pile and the sliding bed; the I-shaped steel and the crown beam are used for reinforcing the connection among all the micro piles to form an integral micro pile group; and the plurality of prestressed anchor rods are used for reinforcing the connection between the micro pile group and the sliding bed.
Further, the laying angle of the prestressed anchor rod is 25 degrees +/-5 degrees from the horizontal line.
Furthermore, the distance between the micro-piles is 10 times of the pile diameter, and the row pitch of the micro-piles is 8 times of the pile diameter.
Furthermore, the prestressed anchor rod is a grouting anchor rod.
Further, the crown beams are arranged in a triangular net shape.
Furthermore, the diameter of the through hole on the grouting steel sleeve is 20 mm.
The utility model has the beneficial effects that: utilize a novel variable cross section anchor type miniature stake, the combination system of anchor pulling row stake mode promotes the cling compound ability, strengthens the stability of accumulation layer landslide. The variable-section pile body design that the pile body is sleeved with the grouting steel sleeve is adopted, so that the rigidity of the slip crack surface is improved, and the shearing resistance is enhanced; during grouting, concrete flows out through the through holes in the grouting steel sleeve, and a composite soil body is formed at the slip crack surface, so that the shearing resistance of the pile group is further improved when landslide occurs; the upper end of the pile body is provided with a prestressed anchor rod, so that the miniature pile is connected with the sliding bed, and the stability of the pile group is further enhanced by using a crown beam and anchor row piles, and the anti-sliding stability is improved.
Drawings
FIG. 1 is a schematic view of a micro-pile structure for managing landslide of a heap in accordance with the present invention;
FIG. 2 is an elevation view of a micro-pile structure for use in pile landslide remediation according to the present invention;
FIG. 3 is a longitudinal cross-sectional view of a micro-pile structure for use in heap landslide remediation in accordance with the present invention;
FIG. 4 is a schematic view of the arrangement of the crown beams of a micro-pile structure for managing the landslide of a stacking layer according to the present invention;
fig. 5 is a schematic view of the connection relationship between the pile body, the prestressed anchor rod and the i-steel in the micro-pile structure for managing the landslide of the accumulation layer.
Wherein, 1, a micro pile; 2. a slider; 3. a crown beam; 4. a pile body; 5. a pre-stressed anchor rod; 6. i-shaped steel; 7. grouting a steel sleeve; 8. a bolt; 9. and (5) a slip surface, and 10. a slip bed.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model provides a micro pile structure for managing landslide of a stacking layer, which comprises a plurality of micro piles 1, a plurality of prestressed anchor rods 5, an I-shaped steel 6 and a crown beam 3, wherein each micro pile 1 is used for high-pressure grouting through the top of the micro pile and then is discharged through a grouting steel sleeve 7 so as to reinforce the connection between the micro pile 1 and a sliding bed 10; the I-shaped steel 6 and the crown beam 3 are used for reinforcing the connection among the micro piles 1 to form an integral micro pile group; the prestressed anchor rods 5 are used for reinforcing the connection between the pile group of the micro pile and the sliding bed 10, so that the variable cross-section anchoring type micro pile is integrally formed, and the anti-skid force of the micro pile is increased by reinforcing the steel protective body and laying anchor rods for anchoring;
the bottom of each micro pile 1 is used for penetrating through the sliding body 2 and being inserted into the sliding bed 10, and the arrangement mode of each micro pile 1 is that a plurality of rows are arranged in parallel and staggered in each row; each miniature pile 1 comprises a pile body 4 and a grouting steel sleeve 7, the pile body 4 is a steel pipe concrete pile, the grouting steel sleeve 7 is coaxially sleeved on the outer side of the lower part of the pile body 4, a plurality of through holes are uniformly distributed on the circumferential surface of the grouting steel sleeve 7, and the through holes are communicated with the inside of the pile body 4.
On a row of micro-piles 1 close to the slope surface of the sliding body 2, each prestressed anchor rod 5 is obliquely inserted through the top of each pile body 4 and inserted into the sliding bed 10 through the sliding body 2. As shown in fig. 5, the i-shaped steel 6 connects the prestressed anchor rods 5 on each micro pile 1 in the same row by bolts 8; as shown in fig. 2, the crown beam 3 is cast to connect the tops of the micro-piles 1. The tops of the micro piles are connected by a crown beam, the prestressed anchor rods 5 are driven into the upper parts of the micro piles, and I-shaped steel 6 is welded between the middle and upper sections of the micro piles for connection. The top of the pile body 4 is connected by a concrete framework crown beam 3, the crown beam 3 of 50 cm-100 cm is poured, and the bottom of the crown beam 3 is reinforced and isolated by an MICP layer.
In some embodiments, as shown in fig. 3, the prestressed anchor 5 is laid at an angle of 25 ° ± 5 ° with respect to the horizontal line, so as to optimize the anchoring effect of the prestressed anchor 5 and the slider bed 10.
In some embodiments, as shown in fig. 4, the micropiles 1 are arranged in a quincunx pile form, the distance between the micropiles 1 is 10 times the diameter of the micropiles, and the distance between the micropiles 1 is 8 times the diameter of the micropiles. The quincuncial pile type arrangement of the micro piles is matched with connection of the I-shaped steel and connection of the crown beams to form a pile group, and the pile group can play a better role in fixing when landslide occurs.
In some embodiments, the prestressed anchors 5 are grouting anchors, and each prestressed anchor 5 may be anchored by high-pressure grouting and applying prestress.
In some embodiments, as shown in fig. 4, the crown beams 3 are arranged in a triangular net shape, so that the material consumption can be saved, and the construction is convenient.
In some embodiments, the outer diameter of the pile body 4 of the micro pile 1 is 108mm, the wall thickness is 4mm, the length is 15 m, and the diameter of the through hole on the grouting steel sleeve 7 is 20 mm.
In some embodiments, the anchoring depth of the micropile 1 is 1/3 the length of the shaft. The anchor rod body of the prestressed anchor rod 5 adopts 3x7 phi 5 steel dumpling lines with the diameter of 15.2mm, oil stains and rust spots are removed before the prestressed anchor rod is used, blanking is strictly carried out according to the design size, the blanking length error of each steel dumpling line is not more than 50mm, and the thickness of a protective layer is not less than 20 mm.
The utility model relates to a use method of a micro pile structure for managing the landslide of a stacking layer, which comprises the following steps:
driving the micro pile 1 attached with the grouting steel sleeve 7 into a sliding bed 10 to be treated, so that the middle point of the grouting steel sleeve 7 is positioned on a slip crack surface 9; on a row of micro piles 1 close to the slope surface of a sliding body 2, a prestressed anchor rod 5 is obliquely inserted into a pile body 4 of each micro pile 1, the pile bodies are inserted into a sliding bed 10, and each prestressed anchor rod 5 is anchored in a high-pressure grouting and prestress applying mode; connecting the prestressed anchor rods 5 by using I-shaped steel 6; pouring and connecting the tops of the micro piles 1 to form a crown beam 3; and pressurizing and grouting from the top of the micro pile 1, wherein the grout seeps out from the opening of the grouting steel sleeve 7 to form a mixed material reinforced peripheral soil body with the peripheral soil body.
Wherein, the anchoring depth of the micro-pile 1 is 1/3 of the length of the pile body 4. The depth of the prestressed anchor rod 5 driven into the landslide body 2 is 10 m. The pile body 4 of the miniature pile 1 is internally provided with a fixed support rib.
Determining the position of a sliding body through field exploration, driving a pile body 4 into a sliding bed 10 through the sliding body 2, and arranging pile groups according to a plum blossom shape, wherein the pile pitch of each miniature pile is 10 times of the pile diameter, and the row pitch of each miniature pile is 8 times of the pile diameter as shown in figure 1; adjusting the length of the pile body 4 according to the trend of the slip crack surface 9, enabling the central point of the grouting steel sleeve 7 to be positioned on the surface line of the slip crack surface 9, grouting from the upper opening of the pile body 4, and testing and monitoring the formation of a reinforcing layer at the through hole of the steel sleeve; the prestressed anchor rods 5 are driven into the upper ends of the row of pile bodies 4 close to the slope surface of the sliding body 2, and the laying angle of the prestressed anchor rods 5 is 25 +/-5 degrees with the horizontal line. As shown in fig. 3, according to the exploration result, the prestressed anchor rod 5 is driven into the sliding bed 10, and then the crown beam 3 shown in fig. 4 is poured on the top of the micro-pile body 4, so that the pile group obtains better integrity; i-shaped steel 6 is arranged in the middle of each row of pile bodies of the pile group, the anchor pile row mode is adopted, all prestressed anchor rods 5 are connected through the I-shaped steel 6, and the prestressed anchor rods 5 are driven into a landslide 10, so that the miniature pile group is stably connected with a landslide body, the performance can be better exerted when the landslide occurs, and the harm caused by the landslide is reduced.
The cement slurry is M30 cement slurry, the water-cement ratio is 0.45:1, and P.O42.5R portland cement is adopted as the cement.
The prestressed anchor 5 is fixed on the I-shaped steel 6 by bolts 8.
Determining parameters of the landslide based on a physical and mechanical experiment of soil, and determining the worst sliding surface of the side slope, namely a slip crack surface 9 by means of field exploration; driving the miniature pile 1 attached with the grouting steel sleeve 7 into a slide body 2 to be treated, and ensuring that the middle point of the grouting steel sleeve 7 is positioned on a slip crack surface 9; and (3) penetrating the prestressed anchor rod 5 through the pile body 4, penetrating the sliding body 2, and driving the prestressed anchor rod into the sliding bed 10 to a driving depth of 10 m. In the structure, the micro pile 1 is embedded in the sliding body 2 and the sliding bed 10, cement slurry is poured into the pile body 4 in a high-pressure grouting mode, the grouting steel sleeve 7 is combined with surrounding rock soil to form a complex through the through hole in the grouting steel sleeve 7, the shear strength of a soil body of the micro pile 1 at the slip crack surface 9 is increased, and the bottom of the micro pile 1 is fixed together. The mini-piles 1 arranged in a quincunx shape can greatly improve the bearing capacity of the whole device, and the I-shaped steel 6 and the prestressed anchor rods 5 connected between the mini-piles 1 can anchor the landslide rock soil, so that the anti-skid capacity is improved, and the landslide stability is enhanced.
The micro pile is widely used in the stability control of the side slope as a supporting and anti-sliding structure, and the supporting and blocking structure has the characteristics of small slope releasing space, large lateral rigidity and the like. In recent years, the technology of multi-row micro-piles is gradually developed, the multi-row micro-piles are combined and used through rigid connection of pile top connecting beams, the multi-row micro-piles are considered as a whole, a larger supporting and anti-sliding effect can be achieved on rock and soil bodies, and the strength of soil bodies among piles and around the piles is enhanced. However, the existing micro pile group has a certain protection effect, and the pile group can be damaged due to excessive shearing force generated by landslide. The utility model relates to a micro pile structure for managing the landslide of the accumulation layer, which is a combined system of an anchor and pull pile arrangement mode to improve the anti-skidding capacity and enhance the stability of the landslide of the accumulation layer. The pile body of the adopted novel miniature pile is welded with a steel grouting steel sleeve, the rigidity of the variable-section pile body at a sliding surface is improved, and the shearing resistance is enhanced; during grouting, concrete flows out through the through holes in the grouting steel sleeve, and a composite soil body is formed at the sliding surface, so that the shearing resistance of the pile group is further improved when landslide occurs; the upper end of the pile body is provided with a prestressed anchor rod, so that the miniature pile is connected with the sliding bed, and the stability of the pile group is further enhanced by using a crown beam and anchor row piles, and the anti-sliding stability is improved.

Claims (6)

1. A micro-pile structure for use in pile landslide remediation, comprising:
the bottom of each micro pile (1) is used for being inserted into a sliding bed (10), and the micro piles (1) are arranged in a mode that multiple rows are arranged in parallel and staggered in each row; each of said micropiles (1) comprises:
a pile body (4) which is a steel pipe concrete pile;
the grouting steel sleeve (7) is coaxially sleeved on the outer side of the lower part of the pile body (4), a plurality of through holes are uniformly distributed on the circumferential surface of the grouting steel sleeve (7), and the through holes are communicated with the interior of the pile body (4);
the prestressed anchor rods (5) are arranged on a row of miniature piles (1) close to the slope surface of the sliding body (2), and each prestressed anchor rod (5) is obliquely inserted from the top of each pile body (4) and inserted into the sliding bed (10);
the I-shaped steel (6) is used for connecting the prestressed anchor rods (5);
the crown beam (3) is cast and connected with the top of each micro pile (1);
each micro pile (1) is used for high-pressure grouting through the top of the micro pile and then is discharged through the grouting steel sleeve (7) so as to reinforce the connection between the micro pile (1) and the sliding bed (10); the I-shaped steel (6) and the crown beam (3) are used for reinforcing the connection among the micro piles (1) to form an integral micro pile group; and the prestressed anchor rods (5) are used for reinforcing the connection between the micro pile group and the sliding bed (10).
2. A micro-pile structure for use in heap landslide remediation as claimed in claim 1 wherein the pre-stressed anchor (5) is laid at an angle of 25 ° ± 5 ° to the horizontal.
3. A micropile structure for use in heap landslide remediation according to claim 1 or claim 2 wherein the micropiles (1) are spaced apart by 10 times the diameter of the micropile and the pitch of the micropiles (1) is 8 times the diameter of the micropile.
4. A micro-pile structure for use in the treatment of landslide of a heap as claimed in claim 1 or claim 2 wherein the pre-stressed anchor (5) is a slip-cast anchor.
5. A micro-pile structure for use in heap landslide remediation according to claim 1 or 2 wherein the crown beams (3) are arranged in a triangular mesh.
6. A micropile structure for use in heap landslide remediation according to claim 1 or claim 2 wherein the micropile body (4) of the micropile (1) has an external diameter of 108mm, a wall thickness of 4mm and a length of 15 metres, and the diameter of the through hole in the grouted steel sleeve (7) is 20 mm.
CN202120903153.2U 2021-04-28 2021-04-28 A micro pile structure for accumulation layer landslide is administered Active CN215801698U (en)

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Application Number Priority Date Filing Date Title
CN202120903153.2U CN215801698U (en) 2021-04-28 2021-04-28 A micro pile structure for accumulation layer landslide is administered

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Application Number Priority Date Filing Date Title
CN202120903153.2U CN215801698U (en) 2021-04-28 2021-04-28 A micro pile structure for accumulation layer landslide is administered

Publications (1)

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CN215801698U true CN215801698U (en) 2022-02-11

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