CN112726568A - Method for reinforcing silt sand layer - Google Patents
Method for reinforcing silt sand layer Download PDFInfo
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- CN112726568A CN112726568A CN202011599560.5A CN202011599560A CN112726568A CN 112726568 A CN112726568 A CN 112726568A CN 202011599560 A CN202011599560 A CN 202011599560A CN 112726568 A CN112726568 A CN 112726568A
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- drill
- sand layer
- cement
- silt sand
- hole
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a method for reinforcing a silt sand layer, which comprises the following steps: s1: a drill bit component of the stirring drilling machine drills holes towards the direction of the silt sand layer, in the drilling process, a stirring blade is opened and stirs the silt sand layer, and meanwhile, grouting equipment sprays cement slurry into the silt sand layer through a slurry inlet hole, a liquid injection cavity of a drill rod and a grouting hole, so that the cement slurry is mixed with the silt sand layer and coagulated into a cement reinforcing body; s2: the drill bit part withdraws from the silt sand layer, the stirring blade withdraws in the withdrawal process, and cement slurry provided by grouting equipment is sprayed into the hole drilled by the drill bit part through the grouting hole and blocks the hole; s3: moving the stirring drilling machine to the position to be reinforced next, and repeating the steps S1-S2; s4: drilling a reinforcing hole on the cement reinforcing body, and inserting the long anchor pipe into the reinforcing hole; s5: and the grouting equipment provides cement grout to the re-reinforcing holes through the long anchor pipes and penetrates into gaps of the cement reinforcing bodies.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to a method for reinforcing a silt sand layer.
Background
The silt sandy soil layer is a specific soil structure in a coastal beach landform area, the difficulty and the risk are high when building construction is carried out on the foundation, the safety risk and the slope instability of foundation pit excavation are greatly increased due to the fact that underground water in a field area is abundant, water permeability of upper rock strata and soil layers is high, the underground water in the field area has certain hydraulic connection with seawater, mud burst, water burst, local collapse, sand flowing and the like are frequently generated in the foundation pit excavation process, and the expansion speed of engineering is greatly influenced, so that the reinforcement of the silt sandy soil layer is an important measure before the foundation pit excavation, the conventional treatment methods comprise a concrete pouring pile method, a deep mixing pile method, a high-pressure rotary jet pile method, an SMW construction method and the like, the methods not only consume a large amount of resources such as cement, reinforcing steel bars and the like, but also have long construction period, and therefore, the invention needs to provide a specific soil structure with small construction risk, The method for reinforcing the silt sand layer has no various special mechanical equipment and can realize quick reaction and quick treatment on site.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a method for reinforcing a silt sand layer, which is characterized in that a stirring drilling machine is used for carrying out primary reinforcing treatment on the silt sand layer to form a cement reinforcing body, cement slurry is permeated into a gap of the cement reinforcing body through a long anchor pipe, and the silt sand layer can be thoroughly reinforced by a two-stage reinforcing mode, so that the reliability is higher.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.
A method for reinforcing a silt sand layer comprises a stirring drilling machine and a long anchor pipe, wherein a drill bit part of the stirring drilling machine comprises a drill rod provided with a liquid injection cavity, one end of the drill rod is provided with a drill bit, the other end of the drill rod is provided with a slurry inlet hole, the drill bit is provided with a slurry injection hole, and the side wall of the drill rod is movably provided with a stirring blade;
the method for reinforcing the silt sand layer comprises the following steps:
s1: a drill bit component of the stirring drilling machine drills holes towards the direction of the silt sand layer, in the drilling process, stirring blades movably mounted on the side wall of a drill rod are subjected to soil body resistance in the direction of the drill rod from the drill bit, so that the stirring blades are opened and form an included angle with the drill rod, the stirring blades rotate along with the drill rod and stir the silt sand layer, and meanwhile, grouting equipment injects cement slurry into the silt sand layer through a slurry inlet hole, a liquid injection cavity of the drill rod and a grouting hole, so that the cement slurry is mixed with the silt sand layer and is coagulated into a cement reinforced body;
s2: the drill bit part of the stirring drilling machine withdraws from the silt sand layer, in the withdrawal process, the stirring blade bears the soil resistance in the direction of the drill bit from the drill rod, so that the stirring blade is withdrawn and clings to the outer wall of the drill rod, and meanwhile, the grouting equipment injects cement slurry into a hole drilled by the drill bit part through the slurry inlet hole, the injection cavity of the drill rod and the grouting hole and blocks the hole;
s3: moving the mixer drill to the next position to be reinforced and repeating the above steps S1-S2;
s4: after the silt sand layer is completely stirred and reinforced by the stirring drilling machine, drilling a reinforcing hole on the formed cement reinforcing body, and inserting the long anchor pipe into the reinforcing hole;
s5: and the grouting equipment provides cement grout to the re-reinforcing holes through the long anchor pipes and penetrates into gaps of the cement reinforcing bodies.
As a further improvement of the invention, the stirring blade is made of elastic steel material, one end of the stirring blade is fixed on the outer wall of the drill rod, and the other end of the stirring blade is provided with a triggering bulge.
As a further improvement of the invention, the drill bit is provided with at least two grouting holes;
the outer wall of the long anchor pipe is provided with at least two grout outlet holes.
As a further improvement of the invention, in the method, water glass and P042.5 cement are used as raw materials of the cement slurry.
As a further improvement of the invention, the water cement ratio in the cement is 0.6-0.8, and the cement mixing amount is 50kg/m3The concentration of the water glass is 32Be, the pressure at the outlet of the grouting equipment is 0.4-0.6MPa, the propelling speed of a drill bit part of the stirring drilling machine is 0.45-0.5m/min, and the rotating speed is 6-8 r/min.
As a further improvement of the invention, the stirring drilling machine is provided with a control gear for adjusting the rotation speed of the drill bit component.
As a further improvement of the present invention, in the step S1, during the process of fully mixing and coagulating the cement slurry with the silt sand layer to form the cement reinforcing body, the monitoring device monitors the concave-convex condition of the ground at the drill hole of the churning drill, when the ground at the drill hole of the churning drill is concave, the pressure at the outlet of the grouting device is increased to increase the speed of the grouting device for delivering the cement slurry to the silt sand layer, and the rotation rate of the drill bit component of the churning drill is decreased by adjusting the control gear, and when the ground at the drill hole of the churning drill is raised, the pressure at the outlet of the grouting device is decreased to decrease the speed of the grouting device for delivering the cement slurry to the silt sand layer, and the rotation rate of the drill bit component of the churning drill is increased by adjusting the control gear.
As a further improvement of the invention, the monitoring device is an electronic level.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the silt sand layer is primarily reinforced by the stirring drilling machine to form the cement reinforced body, and the cement slurry is permeated into the gap of the cement reinforced body through the long anchor pipe, so that the silt sand layer can be thoroughly reinforced by a two-stage reinforcing mode, and the reliability is higher;
2. the primary reinforcing process of the stirring drilling machine for the silt sand layer is that the drill bit component is used for stirring the silt sand layer and spraying the cement slurry into the silt sand layer, so that the cement slurry and the silt sand layer are fully mixed and coagulated into a cement reinforcing body with integrity, good water stability and higher strength, and the stability of the silt sand layer can be thoroughly improved by using the method;
in addition, the stirring blade of the drill bit part is automatically opened when the stirring blade drills into the silt sand layer and automatically retracted when the stirring blade withdraws from the silt sand layer, so that the primary reinforcing process of the stirring drilling machine is simpler and easier to operate;
3. the method has the advantages of no special requirements for connection of all procedures, small construction risk, no various special mechanical equipment, quick reaction and quick treatment on site, and has a relatively high popularization prospect.
Drawings
FIG. 1 is an elevation view of a drill bit component of the present invention in the direction of the drill rod.
Figure 2 is a side view of a drill bit component of the present invention.
FIG. 3 is a schematic illustration of the drill bit assembly of the present invention agitating and consolidating a layer of silt sand.
FIG. 4 is a schematic representation of a drill bit component of the present invention backing out of a layer of muddy sand.
FIG. 5 is a schematic view of the insertion of the long anchor tube of the present invention into a cement reinforcement.
The reference numbers in the figures are:
1. a drill stem; 2. a drill bit; 3. grouting holes; 4. stirring blades; 5. a trigger protrusion; 6. a long anchor pipe; 7. and (6) slurry outlet.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated.
As shown in fig. 1-5, a method for reinforcing a silt sand layer comprises a stirring drilling machine and a long anchor pipe 6, wherein a drill bit part of the stirring drilling machine comprises a drill rod 1, a liquid injection cavity for cement slurry to enter and exit is arranged in the drill rod 1, one end of the drill rod 1 is provided with a drill bit 2, the other end of the drill rod 1 is provided with a slurry inlet hole, and the drill bit 2 is provided with at least two grouting holes 3 communicated with the liquid injection cavity.
The lateral wall of drilling rod 1 is provided with stirring leaf 4, the other end of stirring leaf 4 is provided with triggers protruding 5, and when triggering protruding 5 and receiving the direction by the directional resistance of drilling rod 1 of drill bit 2, stirring leaf 4 opens and forms the contained angle between 1 with the drilling rod, and when triggering protruding 5 and receiving the direction by the directional resistance of drilling rod 1 to drill bit 2, stirring leaf 4 withdraws and hugs closely drilling rod 1 outer wall.
Specifically, the stirring blade 4 is made of an elastic steel material, and one end of the stirring blade 4 is fixed on the outer wall of the drill rod 1; when the drill bit component of the stirring drilling machine drills in the soil body, the triggering protrusion 5 can bear the soil body resistance in the direction from the drill bit 2 to the drill rod 1, so that the stirring blade 4 overcomes the self elasticity to be opened and forms an included angle with the drill rod 1, when the drill bit component of the stirring drilling machine exits from the soil body, the triggering protrusion 5 can bear the soil body resistance in the direction from the drill rod 1 to the drill bit 2, and the stirring blade 4 is retracted under the action of the soil body resistance and the self elasticity and is tightly attached to the outer portion of the drill rod 1.
The long anchor pipe 6 is internally provided with a liquid inlet cavity for cement slurry to enter and exit, and the outside of the long anchor pipe 6 is provided with at least two slurry outlet holes 7.
The method for reinforcing the silt sand layer comprises the following steps:
s1: a drill bit part of the stirring drilling machine drills holes towards the direction of the muddy sand layer, in the drilling process, the triggering bulge 5 can be subjected to soil resistance from the drill bit 2 to the direction of the drill rod 1, so that the stirring blade 4 overcomes the elasticity of the stirring blade and opens to form an included angle with the drill rod 1, meanwhile, the grouting equipment conveys cement slurry into a liquid injection cavity of the drill rod 1 through the slurry inlet hole, the cement slurry is finally sprayed into the muddy sand layer through the grouting hole 3, and in the stirring process of the stirring blade 4 rotating along with the drill rod 1 to stir the muddy sand layer, the cement slurry and the muddy sand layer are fully mixed and coagulated into a cement reinforcement body with integrity, good water stability and higher strength;
s2: a drill bit part of the stirring drilling machine withdraws from the silt sand layer, in the withdrawal process, the triggering protrusion 5 can bear the resistance of the drill rod 1 in the direction of the drill bit 2, the stirring blade 4 withdraws under the action of the resistance and the self elasticity and clings to the outside of the drill rod 1, and meanwhile, the grouting equipment injects cement slurry into a hole drilled by the drill bit part through the slurry inlet hole, the injection cavity of the drill rod 1 and the grouting hole 3 so as to plug the hole drilled by the drill bit part;
s3: moving the mixer drill to the next position to be reinforced and repeating the above steps S1-S2;
s4: after the muddy sand layer is completely stirred and reinforced into a cement reinforcing body by the stirring drilling machine, drilling a reinforcing hole on the cement reinforcing body, and inserting the long anchor pipe 6 into the reinforcing hole;
s5: the grouting equipment is used for grouting into the re-reinforcing hole through the opening of the long anchor pipe 6, the liquid inlet cavity of the long anchor pipe 6 and the slurry outlet hole 7, and cement slurry finally permeates into a gap of the cement reinforcing body.
Furthermore, the cement slurry in the method adopts water glass + P042.5 cement as a grouting material; the method has the advantages that the water glass and the P042.5 cement are used as grouting materials, namely, double-liquid grouting construction is adopted, the gelling time is adjustable, the diffusion speed and distance of grout in the stratum can be effectively controlled, the flow channel of underground water can be quickly blocked under the condition that underground flowing water flows, and the gel consolidation of the grout is nontoxic and pollution-free.
Furthermore, the water cement ratio in the cement in the method is 0.6-0.8, and the cement mixing amount is 50kg/m3The concentration of the water glass is 32Be, the pressure at the outlet of the grouting equipment is 0.4-0.6MPa, the propelling speed of a drill bit part of the stirring drilling machine is 0.45-0.5m/min, and the rotating speed is 6-8 r/min.
Further, the mixer-drill is provided with a control gear for adjusting the rotation rate of the drill bit member, in the step S1, the cement slurry is fully mixed with the silt sand layer and is coagulated into the cement reinforcing body, the monitoring device monitors the concave-convex state of the ground at the drill hole of the mixer-drill, when the ground at the drill hole of the mixer-drill is sunken, the pressure at the outlet of the grouting device is increased to increase the speed of the grouting device for delivering the cement slurry to the silt sand layer, and the control gear is adjusted to reduce the rotation rate of the drill bit member of the mixer-drill, when the ground at the drill hole of the mixer-drill is raised, the pressure at the outlet of the grouting device is reduced to reduce the speed of the grouting device for delivering the cement slurry to the silt sand layer, and the control gear is adjusted to increase the rotation rate of the drill bit member of the mixer-drill.
Further, the monitoring equipment is an electronic level gauge; the surface subsidence observation points are pre-buried near the drill hole of the stirring drilling machine, the surface subsidence observation points are used as reference points, the concave-convex state of the ground at the drill hole of the stirring drilling machine is observed through the electronic level, the electronic level is the prior art, and the description is not repeated.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for reinforcing a silt sand layer is characterized by comprising a stirring drilling machine and a long anchor pipe, wherein a drill bit part of the stirring drilling machine comprises a drill rod provided with a liquid injection cavity, one end of the drill rod is provided with a drill bit, the other end of the drill rod is provided with a slurry inlet hole, and the drill bit is provided with a slurry injection hole;
the method for reinforcing the silt sand layer comprises the following steps:
s1: a drill bit component of the stirring drilling machine drills holes towards the direction of the silt sand layer, in the drilling process, stirring blades movably mounted on the side wall of a drill rod are subjected to soil body resistance in the direction of the drill rod from the drill bit, so that the stirring blades are opened and form an included angle with the drill rod, the stirring blades rotate along with the drill rod and stir the silt sand layer, and meanwhile, grouting equipment injects cement slurry into the silt sand layer through a slurry inlet hole, a liquid injection cavity of the drill rod and a grouting hole, so that the cement slurry is mixed with the silt sand layer and is coagulated into a cement reinforced body;
s2: the drill bit part of the stirring drilling machine withdraws from the silt sand layer, in the withdrawal process, the stirring blade bears the soil resistance in the direction of the drill bit from the drill rod, so that the stirring blade is withdrawn and clings to the outer wall of the drill rod, and meanwhile, the grouting equipment injects cement slurry into a hole drilled by the drill bit part through the slurry inlet hole, the injection cavity of the drill rod and the grouting hole and blocks the hole;
s3: moving the mixer drill to the next position to be reinforced and repeating the above steps S1-S2;
s4: after the silt sand layer is completely stirred and reinforced by the stirring drilling machine, drilling a reinforcing hole on the formed cement reinforcing body, and inserting the long anchor pipe into the reinforcing hole;
s5: and the grouting equipment provides cement grout to the re-reinforcing holes through the long anchor pipes and penetrates into gaps of the cement reinforcing bodies.
2. The method for consolidating a silt sand layer according to claim 1, wherein the stirring blade is made of an elastic steel material, one end of the stirring blade is fixed on the outer wall of the drill rod, and the other end of the stirring blade is provided with a trigger protrusion.
3. The method for consolidating a silt sand layer according to claim 1, wherein said drill bit is provided with at least two grouting holes;
the outer wall of the long anchor pipe is provided with at least two grout outlet holes.
4. The method for consolidating a silt sand layer according to claim 1, wherein the raw materials of said cement slurry are water glass and P042.5 cement.
5. A method for consolidating a silt sand layer according to claim 4, characterized in that the water cement ratio in the cement is between 0.6 and 0.8 and the cement content is 50kg/m3The concentration of the water glass is 32Be, the pressure at the outlet of the grouting equipment is 0.4-0.6MPa, the propelling speed of a drill bit part of the stirring drilling machine is 0.45-0.5m/min, and the rotating speed is 6-8 r/min.
6. A method for consolidating a layer of silt sand according to claim 1, characterised in that the mixer-drill is provided with control gears for adjusting the rate of rotation of the drill bit members.
7. The method as claimed in claim 6, wherein in the step S1, the monitoring device monitors the unevenness of the ground surface at the drill hole of the churning drill during the process of mixing and coagulating the cement slurry with the silt sand layer to form the cement reinforcement body, when the ground surface at the drill hole of the churning drill is depressed, the pressure at the outlet of the grouting device is increased to increase the speed of the grouting device to deliver the cement slurry to the silt sand layer, and the rotation rate of the drill bit member of the churning drill is decreased by adjusting the control gear, and when the ground surface at the drill hole of the churning drill is raised, the pressure at the outlet of the grouting device is decreased to decrease the speed of the grouting device to deliver the cement slurry to the silt sand layer, and the rotation rate of the drill bit member of the churning drill is increased by adjusting the control gear.
8. A method for consolidating a bed of silt sand according to claim 7, wherein said monitoring device is an electronic level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011599560.5A CN112726568B (en) | 2020-12-29 | 2020-12-29 | Method for reinforcing silt sand layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011599560.5A CN112726568B (en) | 2020-12-29 | 2020-12-29 | Method for reinforcing silt sand layer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109128A (en) * | 1994-05-12 | 1995-09-27 | 王光明 | Process for rotating-spraying composite piles |
| CN204491577U (en) * | 2015-03-19 | 2015-07-22 | 河海大学 | Device is stirred in a kind of spray carrying out consolidation process for specific soil layer |
| CN105421501A (en) * | 2015-12-15 | 2016-03-23 | 中国一冶集团有限公司 | Method for monitoring working state of anchor rod and deformation condition of surrounding soil at sludge environment |
| CN210033289U (en) * | 2019-05-08 | 2020-02-07 | 山西晋建加固特种建筑工程有限公司 | Reaming device for reinforcing soft soil foundation |
-
2020
- 2020-12-29 CN CN202011599560.5A patent/CN112726568B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109128A (en) * | 1994-05-12 | 1995-09-27 | 王光明 | Process for rotating-spraying composite piles |
| CN204491577U (en) * | 2015-03-19 | 2015-07-22 | 河海大学 | Device is stirred in a kind of spray carrying out consolidation process for specific soil layer |
| CN105421501A (en) * | 2015-12-15 | 2016-03-23 | 中国一冶集团有限公司 | Method for monitoring working state of anchor rod and deformation condition of surrounding soil at sludge environment |
| CN210033289U (en) * | 2019-05-08 | 2020-02-07 | 山西晋建加固特种建筑工程有限公司 | Reaming device for reinforcing soft soil foundation |
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| CN112726568B (en) | 2022-04-19 |
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