CN214993929U - Foundation pit support soil nail - Google Patents
Foundation pit support soil nail Download PDFInfo
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- CN214993929U CN214993929U CN202121717337.6U CN202121717337U CN214993929U CN 214993929 U CN214993929 U CN 214993929U CN 202121717337 U CN202121717337 U CN 202121717337U CN 214993929 U CN214993929 U CN 214993929U
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- anchor rod
- grouting anchor
- drill bit
- hollow grouting
- soil nail
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Abstract
The utility model discloses a foundation pit supporting soil nail, which belongs to the field of foundation pit supporting structures and comprises a soil nail main body, a stirring blade and a drill bit, wherein the soil nail main body is a hollow grouting anchor rod; the front end of the hollow grouting anchor rod is fixedly connected with a drill bit, the tail end of the hollow grouting anchor rod is provided with a grouting opening, and the outer wall of one end, close to the drill bit, of the hollow grouting anchor rod is fixedly provided with a stirring blade; the number of the stirring blades is at least two, the stirring blades are arranged at equal intervals and are radially arranged by taking the hollow grouting anchor rod as a center, and the plane where each stirring blade is located is obliquely arranged relative to the axis of the hollow grouting anchor rod; the drill bit is communicated with the inside of the hollow grouting anchor rod, and the drill bit is provided with a jet orifice communicated with the inside of the drill bit. The utility model provides a novel excavation supporting soil nail, what can be better uses in deep basal pit, ground water level are abundant and weak soil stratum.
Description
Technical Field
The utility model relates to a foundation ditch supporting construction field especially relates to a foundation ditch support soil nail.
Background
With the development of national economy, urban population is gathered and increased, the demand of people on public transportation is gradually increased, the demand of urban rail transit construction, particularly subways, is gradually increased due to the unique advantages of the urban rail transit construction, and the problem of foundation pit support, particularly deep foundation pit engineering support, inevitably occurs in the construction of the subways, so that the urban rail transit construction becomes one of the hot problems in the building engineering field of China. Generally, the deep foundation pit engineering has the characteristics of deep excavation depth, complex soil layer conditions, dense adjacent buildings, short construction period, more engineering accidents and the like. Meanwhile, the space-time effect is also considered in the excavation process of the foundation pit, so that the complexity of the supporting work is fully explained.
The traditional soil nailing wall supporting technology has the advantages of simple construction, high economic benefit, short construction period, light and flexible structure and the like, and is widely used in foundation pit supporting. Although the soil nailing wall support has the distinct characteristics, the requirements for deep foundation pit engineering excavation are continuously improved, and the single soil nailing wall cannot meet the requirements of deeper foundation pit support. The traditional soil nailing wall support is suitable for the conditions of good geological conditions or not rich underground water, the drawing force of the soil nails is very high, however, the support effect is not ideal generally for the complex geological conditions with very high water content, particularly in soft soil areas, the drawing force of the soil nails cannot be fully exerted, the resource waste is caused, and the support effect is not obvious.
SUMMERY OF THE UTILITY MODEL
In order to solve the current soil nailing wall and strut the inferior position that has the degree of depth limited, not strong to ground water level suitability, the anchor power of soil nail can not full play in soft soil stratum, the utility model provides a novel excavation supporting soil nail, use in deep basal pit, ground water level abundance and soft soil stratum that can be better.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a foundation ditch support soil nail which characterized in that includes: the soil nail comprises a soil nail main body, stirring blades and a drill bit, wherein the soil nail main body is a hollow grouting anchor rod; the front end of the hollow grouting anchor rod is fixedly connected with a drill bit, the tail end of the hollow grouting anchor rod is provided with a grouting opening, and the outer wall of one end, close to the drill bit, of the hollow grouting anchor rod is fixedly provided with a stirring blade; the number of the stirring blades is at least two, the stirring blades are arranged at equal intervals and are radially arranged by taking the hollow grouting anchor rod as a center, and the plane where each stirring blade is located is obliquely arranged relative to the axis of the hollow grouting anchor rod; the drill bit is communicated with the inside of the hollow grouting anchor rod, and the drill bit is provided with a jet orifice communicated with the inside of the drill bit.
Further, the hollow grouting anchor rod is connected with the stirring blades through welding.
Through the above design scheme, the utility model discloses following beneficial effect can be brought: the utility model provides a foundation ditch support soil nail, the soil nail main part adopts cavity slip casting stock, foundation ditch support soil nail is equipped with the jet, the grout sprayed from the jet can be whole with the cementation of foundation ditch lateral wall soil body, the stability of lateral wall foundation ditch has been improved, stirring vane is mixing the in-process of the soil body, be favorable to the grout fully to consolidate peripheral soil body, the reinforcement soil body curtain that forms simultaneously can play impervious effect, and stirring vane and concrete surface course effect can play fine resistance to plucking effect, provide bigger resistance to plucking. Adopt the utility model provides a reinforced (rfd) foundation ditch lateral wall of underground structure soil nail has improved the stability of foundation ditch lateral wall, and what can be better uses in deep basal pit, ground water level abundance and weak soil stratum, gains good social and economic benefits.
Drawings
Fig. 1 is a schematic view of the foundation pit supporting soil nail applied to the reinforcement of the whole structure of the foundation pit;
fig. 2 is the utility model provides a foundation ditch support soil nail structural schematic.
In the figure: 1-hollow grouting anchor rod; 2-stirring blades; 3-an ejection port; 4-a drill bit; 5-anchor drilling machine.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 and 2, the foundation pit supporting soil nail provided by the utility model is mainly used for supporting a soil nailing wall, and comprises a soil nail main body, a stirring blade 2 and a drill bit 4, wherein the soil nail main body is a hollow grouting anchor rod 1; the front end of the hollow grouting anchor rod 1 is fixedly connected with a drill bit 4, the tail end of the hollow grouting anchor rod 1 is provided with a grouting opening, a center hole of the hollow grouting anchor rod 1 is used as a drilling high-pressure air-water channel and a grouting channel, and the outer wall of one end, close to the drill bit 4, of the hollow grouting anchor rod 1 is fixedly provided with a stirring blade 2; the number of the stirring blades 2 is at least two, the stirring blades 2 are arranged at equal intervals and are radially arranged by taking the hollow grouting anchor rod 1 as a center, and the plane where each stirring blade 2 is located is obliquely arranged relative to the axis of the hollow grouting anchor rod 1; the drill bit 4 is communicated with the inside of the hollow grouting anchor rod 1, and the drill bit 4 is provided with a jet orifice 3 communicated with the inside of the drill bit 4.
Further, the hollow grouting anchor rod 1 is connected with the stirring blade 2 by welding.
The hollow grouting anchor rod 1 is a common hollow grouting anchor rod in the prior art, namely, the anchor rod body of the hollow grouting anchor rod 1 is in a hollow design, the center hole of the anchor rod body is used as a drilling high-pressure air-water channel and a grouting channel, and the outer surface of the anchor rod body is in a full-length standard large-pitch thread structure.
The utility model provides a process that excavation supporting soil nail was applied to and consolidates the foundation ditch as follows:
1. excavation of a foundation pit:
after mechanical excavation is performed on foundation pit excavation and soil nailing wall construction from top to bottom in a segmented mode according to design requirements, the slope is trimmed manually, the requirement for meeting the flatness and the gradient of the slope is guaranteed, the slope allowable deviation is +/-20 mm, and the slope soil is removed before the slope is sprayed with concrete for supporting.
2. Setting anchor rod drilling machine 5
And after the foundation pit is excavated to the designed depth, leveling the bottom of the foundation pit, and placing an anchor rod drilling machine 5.
3. Preparation of slurry
The grouting material is cement paste, the water cement ratio of the cement paste is preferably 0.5-0.55, the cement paste is uniformly mixed, and the cement mixed at one time is used before initial setting;
4. soil nail installation
Use roofbolter 5 will the utility model relates to an during excavation supporting soil nail bored into the soil layer according to the designing requirement, the limit is bored and is carried out the whitewashing and handle.
5. Shotcrete panel construction
Selecting medium coarse sand as the concrete fine aggregate, wherein the mud content is less than 3%; the coarse aggregate is preferably graded gravel with the particle size of not more than 20 mm; the weight ratio of cement to sand is preferably 1: 4-1: 4.5, the sand rate is preferably 45-55%, and the water-cement ratio is preferably 0.4-0.45; when the admixture such as the accelerating agent and the like is used, a compatibility test of the admixture and the cement and a cement paste condensation test are carried out, and the dosage of the admixture and the doping method are determined through the tests;
the spraying operation should be carried out in sections in sequence, the spraying sequence in the same section should be uniformly sprayed from bottom to top, and the once spraying thickness is preferably 30 mm-80 mm; when the concrete is sprayed, the spray head and the wall surface of the soil nailing wall are kept vertical, and the distance between the spray head and the wall surface of the soil nailing wall is 0.6-1.0 m; and (5) spraying water for curing in time after the sprayed concrete is finally set for 2 hours.
Claims (2)
1. The utility model provides a foundation ditch support soil nail which characterized in that includes: the soil nail comprises a soil nail main body, stirring blades (2) and a drill bit (4), wherein the soil nail main body is a hollow grouting anchor rod (1); the front end of the hollow grouting anchor rod (1) is fixedly connected with a drill bit (4), the tail end of the hollow grouting anchor rod (1) is provided with a grouting opening, and the outer wall of one end, close to the drill bit (4), of the hollow grouting anchor rod (1) is fixedly provided with a stirring blade (2); the number of the stirring blades (2) is at least two, the stirring blades (2) are arranged at equal intervals and are radially arranged by taking the hollow grouting anchor rod (1) as a center, and the plane where each stirring blade (2) is located is obliquely arranged relative to the axis of the hollow grouting anchor rod (1); the drill bit (4) is communicated with the inside of the hollow grouting anchor rod (1), and the drill bit (4) is provided with a jet orifice (3) communicated with the inside of the drill bit.
2. The foundation pit support soil nail of claim 1, wherein: the hollow grouting anchor rod (1) is connected with the stirring blades (2) through welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121717337.6U CN214993929U (en) | 2021-07-27 | 2021-07-27 | Foundation pit support soil nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121717337.6U CN214993929U (en) | 2021-07-27 | 2021-07-27 | Foundation pit support soil nail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214993929U true CN214993929U (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121717337.6U Active CN214993929U (en) | 2021-07-27 | 2021-07-27 | Foundation pit support soil nail |
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| CN (1) | CN214993929U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030188A (en) * | 2022-07-20 | 2022-09-09 | 中建八局第二建设有限公司 | Self-drilling anchor rod foundation pit supporting method for rock-saltpeter area |
-
2021
- 2021-07-27 CN CN202121717337.6U patent/CN214993929U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030188A (en) * | 2022-07-20 | 2022-09-09 | 中建八局第二建设有限公司 | Self-drilling anchor rod foundation pit supporting method for rock-saltpeter area |
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