CN110904975A - Soil nail support construction method and drill rod for support construction - Google Patents
Soil nail support construction method and drill rod for support construction Download PDFInfo
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- CN110904975A CN110904975A CN201911072550.3A CN201911072550A CN110904975A CN 110904975 A CN110904975 A CN 110904975A CN 201911072550 A CN201911072550 A CN 201911072550A CN 110904975 A CN110904975 A CN 110904975A
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- drill rod
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The embodiment of the invention discloses a soil nail support construction method and a drill rod for the support construction, which relate to the technical field of road construction, and the method comprises the following steps: preparation before construction; drilling a drill rod into a slope soil layer in a stirring manner according to design requirements, and grouting from the drill rod in the process of drilling the drill rod into the slope soil layer in the stirring manner; after the drill rod drills to the designed depth, the drill rod is stirred and retreated to the slope surface, and grouting is carried out in the drill rod in the process of stirring and retreating the drill rod; placing the manufactured steel bar body into a soil nail by adopting a post-pressing method; welding the anchor head of the soil nail with the transverse connecting rib; and (5) binding the reinforcing mesh on the slope surface and spraying concrete. According to the method for the soil nail support construction, the drilling and the grouting processes are carried out simultaneously, so that the construction steps are reduced, and the production efficiency can be improved. According to the soil nail for supporting construction, the axial hole and the guniting channel are designed in the soil nail, so that the function of guniting in the drilling process is realized.
Description
Technical Field
The embodiment of the invention relates to the technical field of foundation pit supporting construction, in particular to a soil nailing supporting construction method and a drill rod for supporting construction.
Background
With the rapid development of urban construction, the development and utilization rate of underground space is more and more emphasized, and under the environment background, the development and application of deep foundation pit supporting technology are promoted.
The soil nailing support is one of a plurality of support systems, and in 1990, in the international academic conference of retaining walls held in the united states, the soil nailing support is used as an independent subject and is arranged in parallel with a bolt retaining wall, so that the soil nailing support becomes an independent branch of soil reinforcement subjects and is widely applied.
At present, the common construction process of soil nail support is rod body manufacturing → spiral drilling → embedded drilling → gravity grouting → secondary grout filling → soil nail anchor head and transverse connecting bar welding reinforcing steel → concrete spraying after net binding, but the drilling hole is easy to be necked down in soft soil layer and mucky soil layer to cause pore-forming difficulty, the effective depth and pore-forming diameter are difficult to meet the design requirements, in view of the above, the plumpness and tensile bearing capacity of the grouting body are difficult to guarantee, and potential safety hazards exist in the aspects of stability and safety of foundation pit support. In addition, the quantity of the traditional soil nail manufacturing support is large, generally three supports are in a group, the process is complicated, the cement consumption is large, and the production efficiency is relatively low.
Disclosure of Invention
Therefore, the embodiment of the invention provides a soil nail supporting construction method and a drill rod for supporting construction, and aims to solve the problems of complicated working procedures, low production efficiency, difficult pore forming and the like in the existing soil nail supporting construction process.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of embodiments of the present invention, a method of earth nail support construction includes the steps of:
step one, preparation before construction;
step two, stirring and drilling the drill rod into the slope soil layer according to the design requirement, and grouting from the drill rod in the process of stirring and drilling the drill rod into the slope soil layer;
step three, stirring and withdrawing the drill rod to the slope surface, and grouting from the drill rod in the stirring and withdrawing process of the drill rod; after the drill rod is withdrawn, soil quality of the place acted by the drill rod is mixed with the grouting liquid to form soft cement soil;
step four, a post-pressing method is adopted, and the manufactured steel bar body is placed into soft cement soil to form soil nails;
welding the anchor head of the soil nail with the transverse connecting rib;
and sixthly, spraying concrete after binding the reinforcing mesh on the slope surface.
Further, the preparation before construction specifically comprises the following steps: clearing the surface and leveling the site in the excavation construction area of the foundation pit; positioning an upper side line, a lower side line and a base outer side line of the foundation pit; and excavating to form a slope according to the design working condition of the foundation pit support, and finishing the flatness of the slope.
The transverse connecting rib is designed to have a corresponding diameter according to specific design requirements, and further the transverse connecting rib is a reinforcing steel bar with the diameter of 16 mm.
According to a second aspect of the embodiments of the present invention, a drill rod for supporting construction, which is used for implementing the above method; the drill rod comprises a rod body and a drill bit, and the drill bit is arranged at the head of the rod body; an axial hole is formed in the rod body; the rod body is provided with a stirring blade; and a guniting channel is arranged in the stirring blade and is communicated with the axial hole.
Further, the stirring blade is perpendicular to the rod body.
Further, stirring vane's quantity is four, four stirring vane staggers each other, and wherein two stirring vane sets up in the first plane relatively, two in addition stirring vane sets up in the second plane relatively.
Further, the distance between the first plane and the second plane is 10 cm.
The rod body is designed into a corresponding diameter according to the specific design requirement of the soil nail, and further, the diameter of the rod body is 3.5-7cm relative to the design diameter of the soil nail of 10cm, 12cm, 15cm and 20 cm; .
The embodiment of the invention has the following advantages:
according to the method for the soil nail support construction, the drilling and grouting processes are carried out simultaneously, so that the construction steps are reduced, the cement consumption can be saved by 40%, and the production efficiency is improved; the original soil nail bracket is changed into the transverse connecting rib, so that the number of the brackets is reduced, the process is simplified, and the frictional resistance between the rod body and the cement soil is enhanced; the compound effect of the transverse connecting ribs and the cement soil is fully exerted, and the sufficient stability and safety of the soil nail supporting system are ensured; the method has the advantages of high construction speed and good economical efficiency, particularly has more remarkable benefits in medium-soft soil, mucky soil, sandy soil and plain filling soil layers, and develops a new development space for the construction of the existing soil nailing wall or composite soil nailing wall supporting structure.
According to the soil nail for supporting construction, the axial hole and the slurry spraying channel are designed in the soil nail, so that the slurry spraying function is realized in the drilling process, the drilling length and the drilling distance of the soil nail can be designed and adjusted according to conditions, the soil nail has high tensile bearing capacity and shearing resistance, is suitable for soft soil layers, avoids the problem that the soil nail quality and tensile bearing capacity are influenced due to the shrinkage of soft soil, and can be safely used for a soil nail wall or a composite soil nail wall supporting structure of medium-soft soil, mucky soil, sandy soil and plain fill soil layers.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
Fig. 1 is a partial front view of a drill rod for supporting construction provided in embodiment 1 of the present invention;
fig. 2 is a top view of a drill rod for supporting construction according to embodiment 1 of the present invention;
fig. 3 is a plan view of a foundation pit provided in embodiment 2 of the present invention;
fig. 4 is a schematic view of the construction of a soil nail support provided in embodiment 2 of the present invention;
in the figure: the body of rod 1, drill bit 2, axial hole 3, stirring vane 4, whitewashing passageway 5, foundation ditch slope top 6, foundation ditch slope bottom 7, water-drain mast 8, first dumping nail reinforcing bar 9, second dumping nail reinforcing bar 10, third dumping nail reinforcing bar 11, fourth dumping nail reinforcing bar 12.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The drill rod for supporting construction shown in figures 1-2 comprises a rod body 1 and a drill bit 2, wherein the drill bit 2 is arranged at the head of the rod body 1; an axial hole 3 is formed in the rod body 1; the rod body 1 is provided with a stirring blade 4; and a guniting channel 5 is arranged in the stirring blade 4, and the guniting channel 5 is communicated with the axial hole 3. The drilling and grouting can be simultaneously carried out in the soil nail supporting construction process through the drill rod, the tail end of the rod body 1 is welded with a grouting pipeline, the grouting pipeline is communicated with the axial hole 3, and grouting liquid enters the axial hole 3 through the grouting pipeline and is sprayed out through the grouting channel 5.
The stirring blade 4 is perpendicular to the rod body 1. Through this technical scheme, can carry out the drilling more effectively.
Stirring vane 4's quantity is four, four stirring vane 4 staggers each other, two of them stirring vane 4 sets up relatively in first plane, two the other stirring vane 4 sets up relatively in the second plane. The distance between the first plane and the second plane is 10 cm. Through this technical scheme, realize all-round stirring and whitewashing, improve stirring and whitewashing efficiency, promote the grout body plumpness.
The diameter of the rod body 1 is 3.5cm-7 cm.
Example 2
The project of the embodiment is a 1-layer underground, the excavation depth is 5.40 meters, the area is about 5600 square meters, the project is a foundation pit in a soft soil area, the plane of the foundation pit is shown in fig. 3, wherein an icon 6 represents the top of the foundation pit slope, and an icon 7 represents the bottom of the foundation pit slope.
The method for the soil nail supporting construction of the project comprises the following steps:
step one, preparation before construction: clearing the surface and leveling the site in the excavation construction area of the foundation pit; positioning an upper side line, a lower side line and a base outer side line of the foundation pit; excavating according to the design working condition of a foundation pit support to form a slope, and trimming the flatness of the slope;
designing 4 rows of soil nails as shown in fig. 4, which is as follows:
the diameter of the first row of steel bar bodies 9 is 16mm, the diameter of the soil nails is 100mm, the length of the soil nails is 5m, the horizontal distance is 1m, and the inclination angle is 18 degrees;
the diameter of the second row of steel bar bodies is 12mm, the diameter of the soil nails is 100mm, the length of the soil nails is 4m, the horizontal distance is 1m, and the inclination angle is 18 degrees;
the diameter of the third row of steel bar bodies 11 is 12mm, the diameter of the soil nails is 100mm, the length of the third row of steel bar bodies is 4m, the horizontal distance is 1m, and the inclination angle is 18 degrees;
the diameter of the fourth row of steel bar bodies 12 is 14mm, the diameter of the soil nails is 100mm, the length of the soil nails is 5m, the horizontal distance is 1m, and the inclination angle is 18 degrees.
Step two, stirring and drilling a drill rod with the diameter of 3.5cm into the slope soil layer according to the design requirement, and grouting from the drill rod in the process of stirring and drilling the drill rod into the slope soil layer;
step three, stirring and withdrawing the drill rod to the slope surface, and grouting from the drill rod in the stirring and withdrawing process of the drill rod; after the drill rod is withdrawn, soil on the part acted by the drill rod is mixed with the grouting liquid to form soft cement soil, and the soft cement soil is cylindrical with the diameter of 10 cm;
step four, a post-pressing method is adopted, and the manufactured steel bar body is placed into soft cement soil to form soil nails;
welding the anchor head of the soil nail with the transverse connecting rib; each row of soil nails adopts reinforcing steel bars with the diameter of 16mm as transverse connecting ribs and are welded with the soil nail anchor heads;
and fifthly, spraying concrete after binding the reinforcing mesh on the slope. And (2) binding a reinforcing mesh on the slope, wherein the reinforcing mesh is a bidirectional reinforcing mesh with the inner matching diameter of 8@200, arranging a water drain pipe 8 at a position 2.50m below the ground surface, horizontally spacing 2m, and then spraying C20 fine stone concrete with the spraying thickness of 80 mm.
And after the sixth step is finished, excavating the next layer, and repeating the steps until the designed depth is reached.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for soil nail supporting construction is characterized by comprising the following steps:
step one, preparation before construction;
step two, stirring and drilling the drill rod into the slope soil layer according to the design requirement, and grouting from the drill rod in the process of stirring and drilling the drill rod into the slope soil layer;
step three, the drill rod is withdrawn to the slope surface after being drilled to the designed depth, and grouting is carried out in the drill rod in the process of stirring and withdrawing the drill rod; after the drill rod is withdrawn, soil quality of the place acted by the drill rod is mixed with the grouting liquid to form soft cement soil;
step four, a post-pressing method is adopted, and the manufactured steel bar body is placed into soft cement soil to form soil nails;
welding the anchor head of the soil nail with the transverse connecting rib;
and sixthly, spraying concrete after binding the reinforcing mesh on the slope surface.
2. The method for soil nailing support construction of claim 1, wherein the preparation before construction specifically comprises the following steps: clearing the surface and leveling the site in the excavation construction area of the foundation pit; positioning an upper side line, a lower side line and a base outer side line of the foundation pit; and excavating to form a slope according to the design working condition of the foundation pit support, and finishing the flatness of the slope.
3. A method of soil nailing support construction as claimed in claim 1 wherein the transverse connector bars are reinforcing bars of 16mm diameter.
4. A drill rod for use in support construction, wherein the drill rod is used in the method of any one of claims 1 to 3; the drill rod comprises a rod body (1) and a drill bit (2), wherein the drill bit (2) is arranged at the head of the rod body (1); an axial hole (3) is formed in the rod body (1); the rod body (1) is provided with a stirring blade (4); and a guniting channel (5) is arranged in the stirring blade (4), and the guniting channel (5) is communicated with the axial hole (3).
5. A drill rod for supporting construction according to claim 4, wherein the mixing blade (4) is perpendicular to the rod body (1).
6. A drill rod for supporting construction as claimed in claim 4, wherein the number of the said mixing blades (4) is four, four said mixing blades (4) are staggered, two of the said mixing blades (4) are oppositely arranged on a first plane, and the other two said mixing blades (4) are oppositely arranged on a second plane.
7. A drill rod for use in timbering operations according to claim 6, wherein said first plane and said second plane are spaced apart by a distance of 10 cm.
8. A drill rod for use in support construction according to claim 4, wherein the rod body (1) has a diameter of 3.5-7 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911072550.3A CN110904975A (en) | 2019-11-05 | 2019-11-05 | Soil nail support construction method and drill rod for support construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911072550.3A CN110904975A (en) | 2019-11-05 | 2019-11-05 | Soil nail support construction method and drill rod for support construction |
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| Publication Number | Publication Date |
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| CN110904975A true CN110904975A (en) | 2020-03-24 |
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| CN201911072550.3A Pending CN110904975A (en) | 2019-11-05 | 2019-11-05 | Soil nail support construction method and drill rod for support construction |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2088287A1 (en) * | 1992-02-07 | 1993-08-08 | Masaru Tateyama | Reinforcing block for excavation work and method of construction thereof |
| CN1204713A (en) * | 1998-07-24 | 1999-01-13 | 黄运飞 | Multifunction stirring rotation spray roofbolt rig and construction method |
| CN201212147Y (en) * | 2008-06-23 | 2009-03-25 | 何世鸣 | Combination drill tool for long screwy jet grouting and stirring pile |
| CN102877470A (en) * | 2012-07-27 | 2013-01-16 | 湖南恒盾岩土工程注浆科技有限公司 | Combined soil nailing construction method |
| CN103306280A (en) * | 2013-05-24 | 2013-09-18 | 郭财宝 | Stirring anchor pile implanted in inner hole of drill rod and anchoring method |
| CN108842764A (en) * | 2018-06-01 | 2018-11-20 | 中力建设集团有限公司 | A kind of Stirring formula anchor tube construction method |
-
2019
- 2019-11-05 CN CN201911072550.3A patent/CN110904975A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2088287A1 (en) * | 1992-02-07 | 1993-08-08 | Masaru Tateyama | Reinforcing block for excavation work and method of construction thereof |
| CN1204713A (en) * | 1998-07-24 | 1999-01-13 | 黄运飞 | Multifunction stirring rotation spray roofbolt rig and construction method |
| CN201212147Y (en) * | 2008-06-23 | 2009-03-25 | 何世鸣 | Combination drill tool for long screwy jet grouting and stirring pile |
| CN102877470A (en) * | 2012-07-27 | 2013-01-16 | 湖南恒盾岩土工程注浆科技有限公司 | Combined soil nailing construction method |
| CN103306280A (en) * | 2013-05-24 | 2013-09-18 | 郭财宝 | Stirring anchor pile implanted in inner hole of drill rod and anchoring method |
| CN108842764A (en) * | 2018-06-01 | 2018-11-20 | 中力建设集团有限公司 | A kind of Stirring formula anchor tube construction method |
Non-Patent Citations (2)
| Title |
|---|
| 严绍军等: "《基础工程学（第3版）》", 31 May 2018, 中国地质大学出版社 * |
| 乔魁元: "《看图学技术-土建工程》", 30 June 2013, 中国铁道出版社 * |
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Application publication date: 20200324 |