CN110952542A - Capsule type anchor rod with function of expanding support framework and using method thereof - Google Patents
Capsule type anchor rod with function of expanding support framework and using method thereof Download PDFInfo
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- CN110952542A CN110952542A CN201911385521.2A CN201911385521A CN110952542A CN 110952542 A CN110952542 A CN 110952542A CN 201911385521 A CN201911385521 A CN 201911385521A CN 110952542 A CN110952542 A CN 110952542A
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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
Abstract
The invention discloses a bag type anchor rod with a function of expanding a supporting framework and a using method thereof, belonging to the technical field of construction engineering construction, and comprising an anchor backing plate, an anchor rod body, a connecting device, an expansion bag, a bottom anchoring end, a grouting pipe, a grout inlet hole and a grout outlet hole; the connecting device comprises a transverse telescopic rod, a telescopic hole and a connector, the expansion bag comprises a bag body and a longitudinal telescopic rod, the transverse telescopic rod and the longitudinal telescopic rod respectively comprise an inner sleeve, an outer sleeve, a rubber bulge and a locking device, and a grout inlet hole and a grout outlet hole are formed in the grouting pipe. The invention adopts the umbrella-bracing type enlarged head, changes the stress distribution of the traditional anchor rod, increases the bond force between the anchoring body and the anchor rod body, enhances the drawing force of the anchor rod, improves the reinforcing effect and can play a good role in supporting loose soil in underground engineering.
Description
Technical Field
The invention relates to the technical field of construction engineering construction, in particular to a bag type anchor rod with a function of expanding a support framework and a using method thereof.
Background
With the increasing development strength and depth of underground engineering, deep foundation pit supporting becomes a difficult problem which restricts the high-rise building from high efficiency and safe construction. After the foundation pit is excavated, the side wall of the foundation pit and the soil body slope are easy to deform greatly, and the supporting structure fails. The safety issues of underground works are becoming more and more important. The traditional anchor rod is widely applied to projects such as water conservancy and hydropower, industrial and civil construction, traffic, municipal administration and the like. Often in the process of using anchor bolt support, the problem of anchor end failure is increasingly prominent, and once the anchor end fails, the anchor bolt can not play a substantial role, and the safety of foundation pit construction is seriously threatened.
At present, an anchor rod used in underground engineering and slope reinforcement engineering mainly transfers load by depending on the bonding force and the friction force between an anchoring section and the surrounding soil body, and belongs to a friction type anchor rod. The main disadvantages are: (1) the size of the anchoring force depends on the length of the anchoring section, the property of the soil body contacted with the anchoring section and other factors, and if special weak soil body is encountered, the pulling force of the anchor rod is not high, and the reinforcing effect is not good; (2) the common high-pressure jet enlarged head anchor rod has the problems of low cement soil strength and poor bond between an anchoring body and an anchor rod body; (3) the bag type anchor rod has the problems that the bond wrapping force between the anchoring body and the surrounding soil body is poor, and the pressed end part is not compact. Therefore, the present invention provides a capsule anchor with the function of expanding the supporting skeleton and a method for using the same to solve the above problems.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a capsule anchor rod with a function of expanding a support framework and a using method thereof, and overcomes the defects in the prior art. Through adopting umbrella stand formula enlarged footing, changed the atress distribution of traditional stock, increased the bond stress between the anchor body and the stock body, strengthened the drawing force of stock, improved the reinforcement effect, can control opening of utricule through the depression bar, and can recycle, engineering application prospect is wide, consequently, can play good effect to strutting of loose soil body among the underground works.
The utility model provides a capsule type stock with enlarge support chassis function which characterized in that: comprises an anchor backing plate, an anchor rod body, a connecting device, an expansion bag, a bottom anchoring end, a grouting pipe, a grout inlet hole and a grout outlet hole; the connecting device comprises a transverse telescopic rod, a telescopic hole and a connector, the expansion bag comprises a bag body, a grout discharging hole and a longitudinal telescopic rod, the transverse telescopic rod and the longitudinal telescopic rod respectively comprise an inner sleeve, an outer sleeve, a rubber bulge and a locking device, and the grouting pipe is provided with a grout inlet; one end of the anchor rod body, which is exposed out of the ground surface, is connected with an anchor backing plate, the middle part of the anchor rod is provided with a free section, the other end of the anchor rod body is connected with a connecting device through welding, the anchor rod is bound and connected with a grouting pipe through a steel wire, the length of the grouting pipe is equal to the distance between the anchor backing plate and the bottom anchoring end, one end of a transverse telescopic rod is fixed in a telescopic hole, the other end of the transverse telescopic rod is welded with a longitudinal telescopic rod, each longitudinal telescopic rod is correspondingly connected with one transverse telescopic rod, the rubber bulge and a locking device are fixed on the inner sleeve, and the inner sleeve; the lower end of the longitudinal telescopic rod is hinged with the bottom anchoring end.
Preferably, the connector is of a cylindrical structure, telescopic holes are uniformly formed in the side face of the cylindrical structure, and after the expansion bag receives grouting pressure, the transverse telescopic rod and the longitudinal telescopic rod gradually extend to finally form an umbrella-shaped structure.
Preferably, the expansion bag is a cylindrical closed structure, the expansion bag is a high polymer film, the elastic modulus of the expansion bag is 10-2000Pa, and the thickness of the expansion bag is 3-8 mm.
Preferably, the inner sleeve is made of a steel bar with the diameter of 3-5mm, the outer sleeve is of a double-layer structure, the inner portion of the outer sleeve is made of rubber with the thickness of 2-3mm, the outer portion of the outer sleeve is made of a steel pipe with the thickness of 3-5mm, the rubber bulge is of a circular truncated cone-shaped structure, the diameter of the upper bottom surface of the circular truncated cone-shaped structure is the same as the inner diameter of the outer sleeve, the diameter of the lower bottom surface of the circular truncated cone-shaped structure is 2-5mm larger than the inner diameter of the outer sleeve, the locking device is of a cylindrical structure, the diameter of the cylindrical cross section is the same as the diameter of the lower bottom surface of the circular truncated cone-shaped structure, the top end of the outer sleeve is provided with the circular truncated cone-shaped structure, the specification of the circular truncated cone-shaped structure is 0.2-2mm smaller than the.
Preferably, the diameter range of the pulp inlet hole is 15-35mm, the pulp inlet hole is positioned in the expansion bag, the diameter of the pulp discharge hole is 5-10mm, and the pulp discharge hole is positioned on the bag body and is close to one end of the transverse telescopic rod.
Preferably, the free section has a length of 1 to 5 m.
The use method of the bag type anchor rod with the function of expanding the supporting framework is characterized in that the bag type anchor rod with the function of expanding the supporting framework according to claim 1 is adopted, and the construction is carried out according to the following method:
step 1: drilling, namely constructing by adopting a jet grouting drilling machine to form an anchor rod hole, wherein the depth of the drilling hole is 1-10m below a sliding surface, the diameter of the drilling hole is 3-5 times of the diameter of the anchor rod, the length of an expanded head at the bottom of the drilling hole is 1.0-3.0m, the diameter of the expanded head is 5-20 times of the diameter of the anchor rod, and grouting pressure of 0.1-10MPa is adopted for expanding head section construction;
step 2: placing an umbrella-bracing type enlarged footing anchor rod, connecting an anchor rod body with a connecting device before placing, and quickly installing the connected anchor rod into the hole drilled in the step 1 until the bottom anchoring end of the anchor rod extends into the bottommost part of the hole;
and step 3: pumping slurry into the grouting pipe, wherein the slurry enters the expansion bag through the slurry inlet hole, after the expansion bag is expanded, the slurry enters the hole of the expansion head outside the expansion bag through the slurry outlet hole, and the slurry enables the expansion bag to drive the transverse telescopic rod and the longitudinal telescopic rod to gradually extend, so that the expansion bag is integrally umbrella-shaped;
and 4, step 4: continuously grouting the expansion bag, keeping the current grouting pressure for continuous grouting for 3-5min when grout overflows from the orifice at a constant value, and forming an umbrella-shaped anchoring body framework after grouting;
Preferably, the slurry adopted in the step 3 is basalt fiber cement slurry, the basalt fiber slurry mainly comprises water, cement, a water reducing agent and basalt fibers, the water-cement ratio is 1-1.2, the using amount of the water reducing agent is 1-2% of the mass of the cement, the using amount of the basalt fibers is 1-2% of the total volume of the slurry, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Preferably, the basalt fiber is selected to have different lengths according to different engineering geological conditions,
the standard hammering number N of the soil body is less than 30, the length of the selected basalt fiber is 8-10mm, the diameter is 20um,
the standard hammering number of the soil body is more than or equal to 30 and N is less than 50, the length of the selected basalt fiber is 5-7mm, the diameter is 16um,
the standard hammering number of the soil body is more than or equal to 50 and N is less than 80, the length of the selected basalt fiber is 3-4mm, the diameter is 12um,
the standard hammering number N of the soil body is more than 80, the length of the selected basalt fiber is 1-2mm, and the diameter is 10 um.
Preferably, the basalt fibers need to be pretreated, and the treatment steps are as follows:
(1) carrying out heat treatment on the basalt fiber at the high temperature of 300 ℃ for 3 min;
(2) soaking the basalt fiber after heat treatment in 75% ethanol solution for 10 min;
(3) soaking the soaked basalt fiber in distilled water for 30min, and stirring once every 5 min;
(4) and (4) drying the soaked basalt fibers in the shade.
The invention has the following beneficial technical effects:
(1) by arranging the umbrella-bracing-type structure, the anchoring performance of the anchor rod is integrally increased, the anchor rod is in contact with and bonded with surrounding rock to a greater extent, soil is further compacted, the bond force of the soil to the anchor rod body is improved, and a good supporting effect is exerted in engineering practice; (2) the support rod can be ejected out through the matching of the pressure rod and the converter, so that the capsule body reaches enough space for grouting, and finally a block body is formed to serve as an expanded head section for anchoring; (3) the strength of the soil body around the capsule body is improved through the compaction effect of the capsule body, so that the ultimate bearing capacity of the single anchor is greatly improved under the end bearing effect of the enlarged head of the cement paste; (4) the compression bar can be recycled after being used once, so that the material is saved, and the engineering cost is reduced.
Drawings
Fig. 1 is a schematic structural view of a closed state of a bag type anchor rod with a function of expanding a support framework according to the invention.
Fig. 2 is a structural diagram illustrating a deployed state of a balloon anchor having a function of expanding a support frame according to the present invention.
Fig. 3 is a schematic structural view of an expansion capsule in a capsule anchor rod with the function of expanding a supporting framework.
Fig. 4 is a schematic structural view of a grouting pipe in a bag type anchor rod with the function of expanding a support framework.
Fig. 5 is a schematic structural view of the split telescopic rod in the bag type anchor rod with the function of expanding the supporting framework.
Fig. 6 is a structural schematic diagram of the combined telescopic rod in the bag type anchor rod with the function of expanding the supporting framework.
Wherein, 1-anchor backing plate, 2-anchor rod body, 3-connecting device, 4-expansion bag, 5-bottom anchoring end, 6-grouting pipe, 7-transverse expansion rod, 8-expansion hole, 9-connector, 10-bag body, 11-longitudinal expansion rod, 12-grout inlet hole, 13-grout outlet hole, 14-inner sleeve, 15-outer sleeve, 16-rubber bulge and 17-locking device.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
the construction is carried out in the soil with the standard hammering number of 25, the total length of the anchor rod is 15m, and the concrete construction steps are as follows:
as shown in fig. 1 to 6, a capsule anchor rod with function of expanding support skeleton is characterized in that: the anchor comprises an anchor backing plate 1, an anchor rod body 2, a connecting device 3, an expansion bag 4, a bottom anchoring end 5, a grouting pipe 6, a grout inlet hole 12 and a grout outlet hole 13; the connecting device 3 comprises a transverse telescopic rod 7, a telescopic hole 8 and a connector 9, the expansion bag 4 comprises a bag body 10, a slurry discharge hole 13 and a longitudinal telescopic rod 11, the transverse telescopic rod 7 and the longitudinal telescopic rod 11 respectively comprise an inner sleeve 14, an outer sleeve 15, a rubber bulge 16 and a locking device 17, and the grouting pipe 6 is provided with a slurry inlet hole 12; one end, exposed on the ground surface, of the anchor rod body 2 is connected with an anchor backing plate 1, the middle part of the anchor rod is provided with a free section, the other end of the anchor rod body 2 is connected with a connecting device 3 through welding, the anchor rod is bound and connected with a grouting pipe 6 through a steel wire, the length of the grouting pipe 6 is equal to the distance between the anchor backing plate 1 and a bottom anchoring end 5, one end of a transverse telescopic rod 7 is fixed in a telescopic hole 8, the other end of the transverse telescopic rod 7 is welded with longitudinal telescopic rods 11, each longitudinal telescopic rod 11 is correspondingly connected with one transverse telescopic rod 7, a rubber bulge 16 and a locking device 17 are fixed on an inner sleeve 14, and the inner sleeve 14, the rubber bulge 16 and the locking device 17; the lower end of the longitudinal telescopic rod 11 is hinged with the bottom anchoring end 5.
Preferably, the connector 9 is a cylindrical structure, the side surface of the cylindrical structure is uniformly provided with telescopic holes 8, and after the expansion bag 4 receives grouting pressure, the transverse telescopic rod 7 and the longitudinal telescopic rod 11 gradually extend to finally form an umbrella-shaped structure.
Preferably, the expansion bladder 4 is a cylindrical closed structure, the expansion bladder 4 is a high polymer film, the elastic modulus of the expansion bladder 4 is 150Pa, and the thickness of the expansion bladder 4 is 5 mm.
Preferably, interior sleeve pipe 14 adopts the reinforcing bar preparation that the diameter is 4mm to form, outer tube 15 is bilayer structure, and inside adoption thickness is 2 mm's rubber, and the outside adopts thickness to form for 3 mm's steel pipe preparation, rubber bulge 16 is round platform shape structure, and the last bottom surface diameter of round platform shape structure is the same with the inner diameter of outer tube 15, and the lower bottom surface diameter ratio of round platform shape structure is 3mm big than the inner diameter of outer tube 15, locking device 17 is cylindrical structure, and cylindrical cross-section diameter is the same with the bottom surface diameter under the round platform shape structure, the top of outer tube 15 is provided with round platform shape structure, and the specification of round platform shape structure is 2mm less than the specification of rubber bulge 16, and the total length of horizontal telescopic link 7 reaches 0.5m, and the total length of vertical telescopic link 11 reaches 1.0 m.
Preferably, the diameter of the grout inlet hole 12 is 15-35mm, the grout inlet hole 12 is positioned in the expansion bladder 4, the diameter of the grout outlet hole 13 is 5-10mm, and the grout outlet hole 13 is positioned above the bladder body 10 and close to the end of the transverse expansion link 7.
Preferably, the free section has a length of 2 m.
The use method of the bag type anchor rod with the function of expanding the supporting framework is characterized in that the bag type anchor rod with the function of expanding the supporting framework according to claim 1 is adopted, and the construction is carried out according to the following method:
step 1: drilling, namely constructing by adopting a jet grouting drilling machine to form an anchor rod hole, wherein the depth of the drilling hole is 3m below a sliding surface, the diameter of the drilling hole is 4 times of the diameter of the anchor rod, the length of an expanded head at the bottom of the drilling hole is 1.5m, the diameter of the expanded head is 10 times of the diameter of the anchor rod, and grouting pressure of 1MPa is adopted for expanding head section construction;
step 2: placing an umbrella-bracing type enlarged footing anchor rod, connecting the anchor rod body 2 with the connecting device 3 before placing the umbrella-bracing type enlarged footing anchor rod, and quickly installing the connected anchor rod into the hole drilled in the step 1 until the bottom anchoring end 5 of the anchor rod extends into the bottommost part of the hole;
and step 3: pumping slurry into the grouting pipe 6, wherein the slurry enters the expansion bag 4 through the slurry inlet hole 12, after the expansion bag 4 is expanded, the slurry enters the expansion head hole outside the expansion bag 4 through the slurry outlet hole 13, the slurry enables the expansion bag 4 to drive the transverse expansion link 7 and the longitudinal expansion link 11 to gradually extend, and the expansion bag 4 is integrally umbrella-shaped;
and 4, step 4: continuously grouting the expansion bag 4, keeping the current grouting pressure for continuous grouting for 5min when the grout overflows from the orifice at a constant value, and forming an umbrella-shaped anchoring body after grouting;
Preferably, the slurry adopted in the step 3 is basalt fiber cement slurry, the basalt fiber slurry mainly comprises water, cement, a water reducing agent and basalt fibers, wherein the water-cement ratio is 1.1, the amount of the water reducing agent is 1% of the mass of the cement, the amount of the basalt fibers is 1.5% of the total volume of the slurry, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Preferably, the basalt fiber is selected to have different lengths according to different engineering geological conditions,
the standard hammering number N of the soil body is less than 30, the length of the selected basalt fiber is 10mm, and the diameter of the selected basalt fiber is 20 um.
Preferably, the basalt fibers need to be pretreated, and the treatment steps are as follows:
(1) carrying out heat treatment on the basalt fiber at the high temperature of 300 ℃ for 3 min;
(2) soaking the basalt fiber after heat treatment in 75% ethanol solution for 10 min;
(3) soaking the soaked basalt fiber in distilled water for 30min, and stirring once every 5 min;
(4) and (4) drying the soaked basalt fibers in the shade.
Example 2:
the construction is carried out in the soil with the standard hammering number of 60, the total length of the anchor rod is 25m, and the concrete construction steps are as follows:
as shown in fig. 1 to 6, a capsule anchor rod with function of expanding support skeleton is characterized in that: the anchor comprises an anchor backing plate 1, an anchor rod body 2, a connecting device 3, an expansion bag 4, a bottom anchoring end 5, a grouting pipe 6, a grout inlet hole 12 and a grout outlet hole 13; the connecting device 3 comprises a transverse telescopic rod 7, a telescopic hole 8 and a connector 9, the expansion bag 4 comprises a bag body 10, a slurry discharge hole 13 and a longitudinal telescopic rod 11, the transverse telescopic rod 7 and the longitudinal telescopic rod 11 respectively comprise an inner sleeve 14, an outer sleeve 15, a rubber bulge 16 and a locking device 17, and the grouting pipe 6 is provided with a slurry inlet hole 12; one end, exposed on the ground surface, of the anchor rod body 2 is connected with an anchor backing plate 1, the middle part of the anchor rod is provided with a free section, the other end of the anchor rod body 2 is connected with a connecting device 3 through welding, the anchor rod is bound and connected with a grouting pipe 6 through a steel wire, the length of the grouting pipe 6 is equal to the distance between the anchor backing plate 1 and a bottom anchoring end 5, one end of a transverse telescopic rod 7 is fixed in a telescopic hole 8, the other end of the transverse telescopic rod 7 is welded with longitudinal telescopic rods 11, each longitudinal telescopic rod 11 is correspondingly connected with one transverse telescopic rod 7, a rubber bulge 16 and a locking device 17 are fixed on an inner sleeve 14, and the inner sleeve 14, the rubber bulge 16 and the locking device 17; the lower end of the longitudinal telescopic rod 11 is hinged with the bottom anchoring end 5.
Preferably, the connector 9 is a cylindrical structure, the side surface of the cylindrical structure is uniformly provided with telescopic holes 8, and after the expansion bag 4 receives grouting pressure, the transverse telescopic rod 7 and the longitudinal telescopic rod 11 gradually extend to finally form an umbrella-shaped structure.
Preferably, the expansion bladder 4 is a cylindrical closed structure, the expansion bladder 4 is a high polymer film, the elastic modulus of the expansion bladder 4 is 150Pa, and the thickness of the expansion bladder 4 is 5 mm.
Preferably, interior sleeve pipe 14 adopts the reinforcing bar preparation that the diameter is 4mm to form, outer tube 15 is bilayer structure, and inside adoption thickness is 2 mm's rubber, and the outside adopts thickness to form for 3 mm's steel pipe preparation, rubber bulge 16 includes round platform shape structure and cylindrical structure, and the last bottom surface diameter of round platform shape structure is the same with outer tube 15's inner diameter, and the lower bottom surface diameter ratio of round platform shape structure is 3mm big than the inner diameter of outer tube 15, the last festival of rubber bulge 16 is cylindrical, and cylindrical cross section diameter is the same with round platform shape structure bottom surface diameter down, the top of outer tube 15 is provided with round platform shape structure, and the specification of round platform shape structure is 2mm less than the specification of rubber bulge 16, and the total length of horizontal telescopic link 7 reaches 0.5m, and the total length of vertical telescopic link 11 reaches 1.0 m.
Preferably, the diameter of the grout inlet hole 12 is 15-35mm, the grout inlet hole 12 is positioned in the expansion bladder 4, the diameter of the grout outlet hole 13 is 5-10mm, and the grout outlet hole 13 is positioned above the bladder body 10 and close to the end of the transverse expansion link 7.
Preferably, the free section has a length of 3 m.
The use method of the bag type anchor rod with the function of expanding the supporting framework is characterized in that the bag type anchor rod with the function of expanding the supporting framework according to claim 1 is adopted, and the construction is carried out according to the following method:
step 1: drilling, namely constructing by adopting a jet grouting drilling machine to form an anchor rod hole, wherein the depth of the drilling hole is 3m below a sliding surface, the diameter of the drilling hole is 4 times of the diameter of the anchor rod, the length of an expanded head at the bottom of the drilling hole is 1.5m, the diameter of the expanded head is 10 times of the diameter of the anchor rod, and grouting pressure of 1MPa is adopted for expanding head section construction;
step 2: placing an umbrella-bracing type enlarged footing anchor rod, connecting the anchor rod body 2 with the connecting device 3 before placing the umbrella-bracing type enlarged footing anchor rod, and quickly installing the connected anchor rod into the hole drilled in the step 1 until the bottom anchoring end 5 of the anchor rod extends into the bottommost part of the hole;
and step 3: pumping slurry into the grouting pipe 6, wherein the slurry enters the expansion bag 4 through the slurry inlet hole 12, after the expansion bag 4 is expanded, the slurry enters the expansion head hole outside the expansion bag 4 through the slurry outlet hole 13, the slurry enables the expansion bag 4 to drive the transverse expansion link 7 and the longitudinal expansion link 11 to gradually extend, and the expansion bag 4 is integrally umbrella-shaped;
and 4, step 4: continuously grouting the expansion bag 4, keeping the current grouting pressure for continuous grouting for 5min when the grout overflows from the orifice at a constant value, and forming an umbrella-shaped anchoring body after grouting;
Preferably, the slurry adopted in the step 3 is basalt fiber cement slurry, the basalt fiber slurry mainly comprises water, cement, a water reducing agent and basalt fibers, wherein the water-cement ratio is 1.1, the amount of the water reducing agent is 1% of the mass of the cement, the amount of the basalt fibers is 1.5% of the total volume of the slurry, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Preferably, the basalt fiber is selected to have different lengths according to different engineering geological conditions,
the standard hammering number of the soil body is more than or equal to 50 and N is less than 80, and the length of the basalt fiber is 3-4mm and the diameter is 12 um.
Preferably, the basalt fibers need to be pretreated, and the treatment steps are as follows:
(1) carrying out heat treatment on the basalt fiber at the high temperature of 300 ℃ for 3 min;
(2) soaking the basalt fiber after heat treatment in 75% ethanol solution for 10 min;
(3) soaking the soaked basalt fiber in distilled water for 30min, and stirring once every 5 min;
(4) and (4) drying the soaked basalt fibers in the shade.
The invention relates to a bag type anchor rod with the function of expanding a supporting framework and a using method thereof.A force distribution of the traditional anchor rod is changed by adopting an umbrella-type expanding head, the bond force between an anchoring body and an anchor rod body 2 is increased, the drawing force of the anchor rod is enhanced, the reinforcing effect is improved, the opening of a bag body 1010 can be controlled through a pressure lever, the bag body can be recycled, and the bag type anchor rod has wide engineering application prospect, so that the bag type anchor rod can play a good role in supporting loose soil in underground engineering.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a capsule type stock with enlarge support chassis function which characterized in that: comprises an anchor backing plate, an anchor rod body, a connecting device, an expansion bag, a bottom anchoring end, a grouting pipe, a grout inlet hole and a grout outlet hole; the connecting device comprises a transverse telescopic rod, a telescopic hole and a connector, the expansion bag comprises a bag body, a grout discharging hole and a longitudinal telescopic rod, the transverse telescopic rod and the longitudinal telescopic rod respectively comprise an inner sleeve, an outer sleeve, a rubber bulge and a locking device, and the grouting pipe is provided with a grout inlet; one end of the anchor rod body, which is exposed out of the ground surface, is connected with an anchor backing plate, the middle part of the anchor rod is provided with a free section, the other end of the anchor rod body is connected with a connecting device through welding, the anchor rod is bound and connected with a grouting pipe through a steel wire, the length of the grouting pipe is equal to the distance between the anchor backing plate and the bottom anchoring end, one end of a transverse telescopic rod is fixed in a telescopic hole, the other end of the transverse telescopic rod is welded with a longitudinal telescopic rod, each longitudinal telescopic rod is correspondingly connected with one transverse telescopic rod, the rubber bulge and a locking device are fixed on the inner sleeve, and the inner sleeve; the lower end of the longitudinal telescopic rod is hinged with the bottom anchoring end.
2. The bag type anchor rod with the function of expanding the supporting framework as claimed in claim 1, wherein the connector is a cylindrical structure, the side surface of the cylindrical structure is uniformly provided with telescopic holes, and after the expansion bag receives grouting pressure, the transverse telescopic rod and the longitudinal telescopic rod are gradually extended to finally form an umbrella-shaped structure.
3. The bag type anchor rod with the function of expanding the supporting framework as claimed in claim 1, wherein the expansion bag is a cylindrical closed structure, the expansion bag is a high molecular polymer film, the elastic modulus of the expansion bag is 10-2000Pa, and the thickness of the expansion bag is 3-8 mm.
4. The bag type anchor rod with the function of expanding the supporting skeleton as claimed in claim 1, wherein the inner sleeve is made of steel bar with a diameter of 3-5mm, the outer sleeve is of a double-layer structure, the inner part is made of rubber with a thickness of 2-3mm, the outer part is made of steel tube with a thickness of 3-5mm, the rubber bulge is of a truncated cone structure, the diameter of the upper bottom surface of the truncated cone structure is the same as the inner diameter of the outer sleeve, the diameter of the lower bottom surface of the truncated cone structure is 2-5mm larger than the inner diameter of the outer sleeve, the locking device is of a cylindrical structure, the diameter of the cylindrical section is the same as the diameter of the lower bottom surface of the truncated cone structure, the top end of the outer sleeve is provided with the truncated cone structure, the size of the truncated cone structure is 0.2-2mm smaller than that of the rubber bulge, and the total length of the transverse telescopic rod is 0, the total length of the longitudinal telescopic rod reaches 1.0-1.5 m.
5. The bag type anchor rod with the function of expanding the supporting skeleton as claimed in claim 1, wherein the diameter of the grout inlet hole is in the range of 15-35mm, the grout inlet hole is positioned in the expansion bag, the diameter of the grout outlet hole is in the range of 5-10mm, and the grout outlet hole is positioned above the bag body and is close to one end of the transverse expansion rod.
6. The capsule type anchor rod with the function of expanding a supporting framework as claimed in claim 1, wherein the length of the free section is 1-5 m.
7. The use method of the bag type anchor rod with the function of expanding the supporting framework is characterized in that the bag type anchor rod with the function of expanding the supporting framework according to claim 1 is adopted, and the construction is carried out according to the following method:
step 1: drilling, namely constructing by adopting a jet grouting drilling machine to form an anchor rod hole, wherein the depth of the drilling hole is 1-10m below a sliding surface, the diameter of the drilling hole is 3-5 times of the diameter of the anchor rod, the length of an expanded head at the bottom of the drilling hole is 1.0-3.0m, the diameter of the expanded head is 5-20 times of the diameter of the anchor rod, and grouting pressure of 0.1-10MPa is adopted for expanding head section construction;
step 2: placing an umbrella-bracing type enlarged footing anchor rod, connecting an anchor rod body with a connecting device before placing, and quickly installing the connected anchor rod into the hole drilled in the step 1 until the bottom anchoring end of the anchor rod extends into the bottommost part of the hole;
and step 3: pumping slurry into the grouting pipe, wherein the slurry enters the expansion bag through the slurry inlet hole, and after the expansion bag is expanded, the slurry enters the hole of the expansion head outside the expansion bag through the slurry outlet hole, so that the expansion bag drives the transverse expansion rod and the longitudinal expansion rod to gradually extend;
and 4, step 4: continuously grouting the expansion bag, keeping the current grouting pressure for continuous grouting for 3-5min when grout overflows from the orifice at a constant value, and forming an umbrella-shaped anchoring body framework after grouting;
step 5; after 7 days or the curing strength of the slurry reaches more than 70 percent of the peak strength, the anchor rod is prestressed, tensioned and locked.
8. The use method of the capsule type anchor rod with the function of expanding the supporting skeleton according to claim 7, wherein the slurry adopted in the step 3 is basalt fiber cement slurry, the basalt fiber slurry mainly comprises water, cement, a water reducing agent and basalt fibers, the water-cement ratio is 1-1.2, the amount of the water reducing agent is 1-2% of the mass of the cement, the amount of the basalt fibers is 1-2% of the total volume of the slurry, and the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
9. The use method of the sac type anchor rod with the function of expanding the supporting skeleton according to the claim 7 or the claim 8, wherein the basalt fiber is selected to have different lengths according to different engineering geological conditions,
the standard hammering number N of the soil body is less than 30, the length of the selected basalt fiber is 8-10mm, the diameter is 20um,
the standard hammering number of the soil body is more than or equal to 30 and N is less than 50, the length of the selected basalt fiber is 5-7mm, the diameter is 16um,
the standard hammering number of the soil body is more than or equal to 50 and N is less than 80, the length of the selected basalt fiber is 3-4mm, the diameter is 12um,
the standard hammering number N of the soil body is more than 80, the length of the selected basalt fiber is 1-2mm, and the diameter is 10 um.
10. The use method of the bag type anchor rod with the function of expanding the supporting skeleton as claimed in claim 7 or claim 8, wherein the basalt fiber is required to be pretreated, and the treatment steps are as follows:
(1) carrying out heat treatment on the basalt fiber at the high temperature of 300 ℃ for 3 min;
(2) soaking the basalt fiber after heat treatment in 75% ethanol solution for 10 min;
(3) soaking the soaked basalt fiber in distilled water for 30min, and stirring once every 5 min;
(4) and (4) drying the soaked basalt fibers in the shade.
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| CN112144526A (en) * | 2020-09-15 | 2020-12-29 | 河北建筑工程学院 | Double-cavity anchor rod structure for improving soil condition |
| CN113217053A (en) * | 2021-05-14 | 2021-08-06 | 江苏科技大学 | Self-adaptive large-deformation prestressed anchor rod |
| CN113294188A (en) * | 2021-05-31 | 2021-08-24 | 中国科学院武汉岩土力学研究所 | Anti-floating and anti-permeability device and method for underwater shield tunnel |
| CN114263172A (en) * | 2021-12-16 | 2022-04-01 | 中交三公局第三工程有限公司 | Pressure-bearing bag type expanded anchor cable and sash beam construction method |
| CN114319298A (en) * | 2022-01-10 | 2022-04-12 | 中国科学院武汉岩土力学研究所 | Anchoring structure |
| CN115125946A (en) * | 2022-05-30 | 2022-09-30 | 广州环投增城环保能源有限公司 | String bag type umbrella-shaped anchor rod |
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