CN1963043A - Construction method for mechanical hole reaming of anchor rod - Google Patents

Construction method for mechanical hole reaming of anchor rod Download PDF

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Publication number
CN1963043A
CN1963043A CN 200510115919 CN200510115919A CN1963043A CN 1963043 A CN1963043 A CN 1963043A CN 200510115919 CN200510115919 CN 200510115919 CN 200510115919 A CN200510115919 A CN 200510115919A CN 1963043 A CN1963043 A CN 1963043A
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China
Prior art keywords
reamer
bolthole
reaming
tube
grouting pipe
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CN 200510115919
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Chinese (zh)
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CN100513745C (en
Inventor
刘波
杨松
胡建林
柳建国
程良奎
张培文
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中国京冶建设工程承包公司
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Priority to CNB2005101159196A priority Critical patent/CN100513745C/en
Publication of CN1963043A publication Critical patent/CN1963043A/en
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Publication of CN100513745C publication Critical patent/CN100513745C/en

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Abstract

The invention involves an anchorage method to reinforcing and maintaining the layer of rock and soil, namely the construction method of producing the prestress anchor bolt using the mechanical reaming reamer. It includes drilling, reaming, washing and slip casting, the slurries are wrapped with the prestress dabber together and are solidified to forming the anchor bolt. The second slip casting is needed after the first slip casting according the design requirements; the second slip casting adopts high pressure splitting casting pipe or many pipes. The construction method of the invention applies to ground layers with different soil strata, it can work in the direction of horizontal angle is 0~90degree, it is equipped with cylinderin volumes and conical reaming volumes along the length of the anchor bar; it can ream only once, and can ream many times or for many volumes, and they are connected with each other for a whole to increasing the contact area between the anchor bolt and the rock or soil. Because of the combination of the effect of anchor bolt end bearing and the effect of friction, it doubles the carrying capacity of anchor bolt and correspondingly shortens the length of the anchor bolt, so it has significant economic benefits.

Description

Construction method for mechanical hole reaming of anchor rod
Technical field
The present invention relates to a kind of anchoring process that rock-soil layer is reinforced and safeguarded, is to adopt the mechanical hole reaming device to make the job practices of prestressed anchor specifically.
Background technology
In the geotechnical engineering, the prestressed anchor pole technology is the new technology of tool vitality.One end of prestressed anchor links to each other with geotechnical body or works, the other end is anchored in the ground, and it is applied prestressing force, become the anchoring system that pulling force is delivered to stable geotechnical body, to bear the structure pulling force that ground pressure, water pressure, anti-floating, overturning or slip resistance analysis etc. are produced, in order to safeguard the stable of geotechnical body and works.But the straight hole column type anchor pole that present engineering circle is generally used, it has the lower deadly defect of bearing capacity, in order to improve the bearing capacity of anchor pole, ground is washed away with water under high pressure in bottom at bolthole, or use the blasting method expansion space, so that strengthen the volume of bolthole, thereby enlarge the contact surface of anchor pole and ground, can improve the bearing capacity of anchor pole.It is very irregular that but water washes away the shape of reaming, and wash away and make geotechnical body reduction itself, and its mechanics parameter descends; And the randomness of blasting method reaming is very big, and main is limited by many social factors with the explosion means, particularly the city.A kind of reamer with mechanical reamer principle design can overcome the defective of above-mentioned expanding method, the reaming accurate positioning, and fixed in shape improves its supporting capacity greatly.The research of its job practices, particularly multistage reaming prestressed anchor pole technology remain developmental research.
Summary of the invention
The object of the present invention is to provide a kind of employing mechanical hole reaming device to carry out reaming, make the anchor rod construction method that increases one or more snippets pyramid type anchoring body on the straight hole column type anchor pole, thereby obtain the high prestressed anchor of bearing capacity, make anchoring system reliable and stable, provide solid underground infrastructure to construction work.
Another object of the present invention is to provide a kind of multistage reamer and high pressure splitting secondary grouting pipe that is used for construction method for mechanical hole reaming of anchor rod.
Construction method for mechanical hole reaming of anchor rod of the present invention, comprising following steps:
1) boring: in the ground stratum, creep into the column type bolthole to projected depth with rig;
2) reaming: propose drilling rod, change drill bit into reamer, not under the expansion state, be placed on the bolthole bottom at reamer, and on drilling rod or frame mark bolthole depth line; Start rig and drive the reamer rotation, give rig pressurization downwards gradually simultaneously, the long and short arm rotation of reamer also expands outwardly the cutting ground, and pyramid type is expanded as in the bolthole bottom;
3) washing: in reaming simultaneously, the feedwater of rig water system is washed cutting object and is cleaned hole wall, observes underwater cutting thing content, and the underwater cutting thing content that overflows in the hole is finished washing more after a little while;
4) slip casting: propose reamer, presstressed reinforcing steel body and Grouting Pipe are inserted the bolthole bottom, once pouring into cement-sand ratio with grouting pump and the Grouting Pipe that is communicated with it is that 1: 0.5~1: 1 cement mortar or water/binder ratio are 0.45~0.5 neat slurry, reach design height, and before slurries final set, extract Grouting Pipe; The requirement of strength of slurries was not less than 15~20Mpa after 7 days, be not less than 25~30Mpa after 28 days; Slurries and presstressed reinforcing steel body bond together, solidify the back and constitute anchor pole.
Construction method for mechanical hole reaming of anchor rod of the present invention wherein after step 4 slip casting, carries out secondary grouting with the secondary grouting pipe on the different depth of bolthole, secondary grouting injects neat slurry with the high-pressure slip-casting machine.
Construction method for mechanical hole reaming of anchor rod of the present invention, wherein on the top of anchor pole, repeating step 2 is made one section anchor pole at least again to step 4.
Secondary grouting pipe in the construction method for mechanical hole reaming of anchor rod of the present invention is a high pressure fracture grouting pipe, the slip casting steel pipe that comprises outer tube and Qi Nei suit, on outer tube, be provided with the ring-type grout outlet of forming by several apertures every 0.5~1m place, on the ring-type grout outlet, all be set with the elastic caoutchouc circle; The sealing of slip casting steel pipe tail end mouth is provided with several pulp apertures around one section tube wall above the tail end mouth, on the outer wall at pulp aperture section two ends, is respectively equipped with and the outer tube closed at both ends, and along the equipped sealing device of outer sleeve inner wall slip.
Secondary grouting pipe in the construction method for mechanical hole reaming of anchor rod of the present invention is many, and the lower end of every pipe is positioned on the different depth of bolthole.
Construction method for mechanical hole reaming of anchor rod of the present invention, comprising following steps:
1) boring: in the ground stratum, creep into the column type bolthole to projected depth with rig;
2) reaming: propose drilling rod, change drill bit into the multistage reamer, not under the expansion state, be placed on the bolthole bottom at reamer, and on drilling rod or frame mark bolthole depth line; Start rig and drive the rotation of multistage reamer, give rig pressurization downwards gradually simultaneously, the long and short arm rotation of multistage reamer also expands outwardly the cutting ground simultaneously, and bolthole is expanded into the multistage pyramid type;
3) washing: in reaming simultaneously, the feedwater of rig water system is washed cutting object and is cleaned hole wall, observes underwater cutting thing content, and the underwater cutting thing content that overflows in the hole is finished washing more after a little while;
4) slip casting: propose reamer, presstressed reinforcing steel body and Grouting Pipe are inserted the bolthole bottom, once pouring into cement-sand ratio with grouting pump and the Grouting Pipe that is communicated with it is that 1: 0.5~1: 1 cement mortar or water/binder ratio are 0.45~0.5 neat slurry, reach design height, and before slurries final set, extract Grouting Pipe; The requirement of strength of slurries was not less than 15~20Mpa after 7 days, be not less than 25~30Mpa after 28 days; Slurries and presstressed reinforcing steel body bond together, solidify the back and constitute anchor pole.
Multistage reamer in the construction method for mechanical hole reaming of anchor rod of the present invention comprises the end reamer, and the end reamer comprises the central tube of slip suit and hollow central axis; Wherein be connected in series a secondary reamer at least in the upper end of central tube; Secondary reamer comprises the central tube of slip suit and hollow central axis, to pass through engaging lug hinged with central tube upper end and central axis lower end respectively for the two ends of the telescopic arm formed for three being hinged by long-armed and galianconism of evenly settling, between the central axis of the central tube of end reamer and the secondary reamer on it, and coaxial fixedly connected between the central axis of the central tube of each secondary reamer and the secondary reamer on it by tube connector.
Construction method for mechanical hole reaming of anchor rod of the present invention is adapted to the stratum of different soil properties, can with horizontal plane angle be 0~90 ° direction construction operation.Geologic information and requirement of engineering according to rock-soil layer; site of action, direction, structural parameters and the density of design anchor pole; help protecting the inherent strength on stratum; stop the further disturbance on stratum; the development of control stratum deformation; improve the safety of work progress,, obtain best stablizing effect with the supporting drag of minimum.The anchor pole that adopts the mechanical hole reaming device to make, existing column type section on anchoring section length has pyramid type reaming section again; Both can a reaming once, again can be repeatedly or the multistage reaming, and be interconnected as an integral body mutually, increase the contact area of anchor pole and geotechnical body, because making, the anchor pole end uses and the combining of rubbing action, improve the anchor pole supporting capacity exponentially, correspondingly also shortened the length of anchor pole, have remarkable economic efficiency.
Description of drawings
The reamer structural principle schematic diagram of Fig. 1 for using in the construction method for mechanical hole reaming of anchor rod of the present invention;
Fig. 2 is the structural principle schematic diagram of the high pressure fracture grouting pipe that uses in the construction method for mechanical hole reaming of anchor rod of the present invention;
The multistage reamer structural principle schematic diagram of Fig. 3 for using among the present invention;
Fig. 4 is for using the multistage anchor pole schematic diagram (section) of multistage reamer moulding among the present invention.
The specific embodiment
In the step of construction method for mechanical hole reaming of anchor rod of the present invention as can be known, matter of utmost importance is on the basis of column type bolthole, according to designing requirement, enlarge one or on differing heights, enlarge a plurality of pyramid type boltholes successively in the bottom, in reaming simultaneously, the water system feedwater, flushing cutting object and cleaning hole wall, after in bolthole, adding the presstressed reinforcing steel body then, with grouting pump and the Grouting Pipe cement injection mortar or the neat slurry in bolthole that are communicated with it, slurries and presstressed reinforcing steel body are bonded together, and be anchored at, form hard anchoring body with ground stratum or works on every side.
The mechanical hole reaming device structure of using among the present invention as shown in Figure 1, it comprises the central tube 2 of slip suit and hollow central axis 3, and central tube 2 upper ends are by being connected with rotary power head with its fixedly connected joint 1, three evenly settle by long-armed 4 and galianconism 5 be hinged the telescopic arm formed two ends respectively with central tube 2 upper ends and central axis 3 lower end external diameters on corresponding upper and lower engaging lug hinged; The compression spring is housed in central tube 2.The lower end of central axis 3 is rotationally connected by rotating disk and rotary disk basement 6.During use, by long-armed 4 and the be hinged telescopic arm formed of galianconism 5 stretching under spring action, enter in the column type bolthole that has crept into, the rotary disk basement 6 that is provided with the awl point is positioned on the bolthole bottom, rotates around rotary disk basement 6 by unit head drive central tube 2 and central axis 3, and pressurization downwards gradually, central tube 2 is to lower slider, make 4,5 rotations of long and short arm and expand outwardly, the cutting ground is until pyramid type is expanded as in the cutting of bolthole bottom.
Presstressed reinforcing steel body and Grouting Pipe are inserted the bolthole bottom, select squash type or piston type grouting pump for use, once pouring into cement-sand ratio by Grouting Pipe is that 1: 0.5~1: 1 cement mortar or water/binder ratio are 0.45~0.5 neat slurry, and extracts Grouting Pipe before slurries final set; Grouting Pipe must be inserted the bolthole bottom, and slurries are continous pouring from bottom to top, guarantees draining and exhaust smoothly in the hole, when slurries are overflowed in the aperture, stops slip casting.The geological conditions of root a tree name rock-soil layer etc. are all multifactor, also can carry out secondary grouting behind once grouting.
Adopt high pressure fracture grouting pipe to carry out slip casting in the method for secondary grouting, high pressure fracture grouting pipe shown in Figure 2 comprises outer tube 7 and packs its interior slip casting steel pipe 8 into; On outer tube 7, every 0.5~1m place be provided with the ring-type grout outlet 10 formed by several apertures ', ring-type grout outlet 10 ' on all be set with elastic caoutchouc circle 9; The sealing of slip casting steel pipe 8 tail end mouths is provided with several pulp apertures 10 around one section tube wall above the tail end mouth, is respectively equipped with the sealing device 11 with outer tube 7 closed at both ends at the two ends of 10 sections of pulp apertures.During use, insert the bolthole bottom simultaneously with the once grouting pipe, the tail end of slip casting steel pipe 8 places the ring-type grout outlet 10 of the bottom on the outer tube 7 ' locate, and high-pressure pump is carried slurries, because the two ends of 10 sections of pulp apertures are sealed with sleeve pipe 7, slurries from ring-type grout outlet 10 ' aperture ejection, and breaking through elastic caoutchouc circle 9, the anchor pole of splitting once grouting formation permeates to the rock-soil layer extruding again, form the anchor pole enlarged body of larger diameter, will increase substantially the anchor pole bearing capacity.Promote continuously slip casting steel pipe 8 to ring-type grout outlet 10 ' locate, repeat said process,, extract slip casting steel pipe 8 thereafter until the secondary grouting of finishing on the different depth.
The secondary grouting pipe also can adopt many common tube, and the lower end of every pipe is positioned on the different depth of bolthole, can carry out secondary grouting to the differing heights place of anchor bar body equally, and secondary grouting can carry out repeatedly.
Can carry out repeatedly reaming in the cylinder bolthole, just on a cylinder bolthole height a plurality of conical reamer sections can be arranged, be in order to improve the bearing capacity of anchor pole equally.In construction, can carry out each operation of reaming, washing and slip casting from bottom to top successively, until one section reaming, washing and grouting with plunger finishing the superiors.
The anchor pole of above-mentioned repeatedly reaming can also adopt the multistage reamer to carry out reaming, one-shot forming.As shown in Figure 3, it comprises the central tube 2 of slip suit and hollow central axis 3, three evenly settle by long-armed 4 and galianconism 5 be hinged that to pass through engaging lug hinged with central tube 2 upper ends and central axis 3 lower ends respectively for the two ends of the telescopic arm formed, the lower end of central axis 3 also is rotationally connected by rotating disk and rotary disk basement 6.At the coaxial fixedly connected tube connector 13 in upper end of the central tube 2 of this reamer, the upper end of this tube connector 13 again with the central axis 3 of a secondary reamer 12 ' coaxial the fixedlying connected in lower end.Secondary reamer 12 comprise the central tube 2 of slip suit ' and hollow central axis 3 ', the two ends of three telescopic arms of evenly settling of being made up of long-armed 4 ' and galianconism 5 ' be hinged are hinged by engaging lug with central tube 2 ' upper end and central axis 3 ' lower end respectively, formation multistage reamer.Obviously i.e. as shown in Figure 1 the reamer of end reamer, the structure of secondary reamer 12 and the structure of end reamer are basic identical, the unit head of rig is fixedlyed connected with the central tube 2 ' upper end of secondary reamer 12 by joint 1 like this, unit head by a bench drill machine drives two reamers, certainly on secondary reamer 12, also can be connected in series and be fixed together, constitute another multistage reamer by the secondary reamer 12 of another root tube connector 13 and another.Like this, in the cylinder bolthole, once finish the reaming construction of a plurality of round taper holes simultaneously, obviously improved operating efficiency.Washing wherein and grouting construction method are all with aforementioned all identical, and formed anchor pole as shown in Figure 4.

Claims (10)

1, a kind of construction method for mechanical hole reaming of anchor rod is characterized in that may further comprise the steps:
1) boring: in the ground stratum, creep into the column type bolthole to projected depth with rig;
2) reaming: propose drilling rod, change drill bit into reamer, not under the expansion state, be placed on the bolthole bottom at reamer, and on drilling rod or frame mark bolthole depth line; Start rig and drive the reamer rotation, give rig pressurization downwards gradually simultaneously, the long and short arm rotation of reamer also expands outwardly the cutting ground, and the bolthole bottom is expanded into pyramid type;
3) washing: in reaming simultaneously, the feedwater of rig water system is washed cutting object and is cleaned hole wall, observes underwater cutting thing content, and the underwater cutting thing content that overflows in the hole is finished washing more after a little while;
4) slip casting: propose reamer, presstressed reinforcing steel body and Grouting Pipe are inserted the bolthole bottom, once pouring into cement-sand ratio with grouting pump and the Grouting Pipe that is communicated with it is that 1: 0.5~1: 1 cement mortar or water/binder ratio are 0.45~0.5 neat slurry, reach design height, and before slurries final set, extract Grouting Pipe; The requirement of strength of slurries was not less than 15~20Mpa after 7 days, be not less than 25~30Mpa after 28 days; Slurries and presstressed reinforcing steel body bond together, solidify the back and constitute anchor pole.
2, construction method for mechanical hole reaming of anchor rod according to claim 1 is characterized in that after described step 4 slip casting, carries out secondary grouting again with the secondary grouting pipe on the different depth of bolthole, and secondary grouting injects neat slurry with the high-pressure slip-casting machine.
3, construction method for mechanical hole reaming of anchor rod according to claim 1 and 2 is characterized in that the top at described anchor pole, and repeating step 2 is made one section anchor pole at least again to step 4.
4, a kind of secondary grouting pipe that is used for the described construction method for mechanical hole reaming of anchor rod of claim 2, it is characterized in that described secondary grouting pipe is a high pressure fracture grouting pipe, the slip casting steel pipe (8) that comprises outer tube (7) and its interior suit, on described outer tube (7), be provided with the ring-type grout outlet of forming by several apertures (10 ') every 0.5~1m place, on described ring-type grout outlet (10 '), all be set with elastic caoutchouc circle (9); The sealing of described slip casting steel pipe (8) tail end mouth, around tail end section tube wall, be provided with several pulp apertures (10), on the two ends outer wall of described pulp aperture (10) section, be respectively equipped with and described outer tube (7) closed at both ends, and along the equipped sealing device (11) of described outer tube (7) inwall slip.
5, a kind of secondary grouting pipe that is used for the described construction method for mechanical hole reaming of anchor rod of claim 2 it is characterized in that described secondary grouting pipe is many, and the lower end of every pipe is positioned on the different depth of bolthole.
6, a kind of construction method for mechanical hole reaming of anchor rod is characterized in that may further comprise the steps:
1) boring: in the ground stratum, creep into the column type bolthole to projected depth with rig;
2) reaming: propose drilling rod, change drill bit into the multistage reamer, not under the expansion state, be placed on the bolthole bottom at reamer, and on drilling rod or frame mark bolthole depth line; Start rig and drive the rotation of multistage reamer, give rig pressurization downwards gradually simultaneously, the long and short arm rotation of multistage reamer also expands outwardly the cutting ground simultaneously, is expanded into the multistage pyramid type on the bolthole;
3) washing: in reaming simultaneously, the feedwater of rig water system is washed cutting object and is cleaned hole wall, observes underwater cutting thing content, and the underwater cutting thing content that overflows in the hole is less, finishes washing;
4) slip casting: propose reamer, presstressed reinforcing steel body and Grouting Pipe are inserted the bolthole bottom, once pouring into cement-sand ratio with grouting pump and the Grouting Pipe that is communicated with it is that 1: 0.5~1: 1 cement mortar or water/binder ratio are 0.45~0.5 neat slurry, reach design height, and before slurries final set, extract Grouting Pipe; The requirement of strength of slurries was not less than 15~20Mpa after 7 days, be not less than 25~30Mpa after 28 days; Slurries and presstressed reinforcing steel body bond together, solidify the back and constitute anchor pole.
7, construction method for mechanical hole reaming of anchor rod according to claim 6 is characterized in that after described step 4 slip casting, carries out secondary grouting again with the secondary grouting pipe on the different depth of bolthole, and secondary grouting injects neat slurry with the high-pressure slip-casting machine.
8, a kind of secondary grouting pipe that is used for the described construction method for mechanical hole reaming of anchor rod of claim 7, it is characterized in that described secondary grouting pipe is a high pressure fracture grouting pipe, the slip casting steel pipe (8) that comprises outer tube (7) and its interior suit, on described outer tube (7), be provided with the ring-type grout outlet of forming by several apertures (10 ') every 0.5~1m place, on described ring-type grout outlet (10 '), all be set with elastic caoutchouc circle (9); The sealing of described slip casting steel pipe (8) tail end, around its tail end section tube wall, be provided with several pulp apertures (10), on the two ends outer wall of described pulp aperture (10) section, be respectively equipped with and described outer tube (7) closed at both ends, and along the equipped sealing device (11) of described outer tube (7) inwall slip.
9, a kind of secondary grouting pipe that is used for the described construction method for mechanical hole reaming of anchor rod of claim 7 it is characterized in that described secondary grouting pipe is many, and the lower end of every pipe is positioned on the different depth of bolthole.
10, a kind of multistage reamer that is used for the described construction method for mechanical hole reaming of anchor rod of claim 6 comprises the end reamer, and described end reamer comprises the central tube (2) of slip suit and hollow central axis (3); It is characterized in that being connected in series a secondary reamer (12) at least in the upper end of described central tube (2); Described secondary reamer (12) comprises the central tube (2 ') of slip suit and hollow central axis (3 '), three evenly settle by long-armed (4 ') and galianconism (5 ') be hinged the telescopic arm formed two ends respectively with described central tube (2 ') on and to pass through engaging lug hinged in central axis (3 ') lower end; Between the central axis (3 ') of the central tube (2) of described end reamer and the described secondary reamer (12) on it, and coaxial fixedly connected between the central axis (3 ') of the central tube (2 ') of each secondary reamer (12) and the secondary reamer on it by tube connector (13).
CNB2005101159196A 2005-11-11 2005-11-11 Construction method for mechanical hole reaming of anchor rod CN100513745C (en)

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CN101832137B (en) * 2009-09-17 2013-12-25 新奥气化采煤有限公司 Pre-embedding method for coal seam roof strut
CN101793157A (en) * 2010-03-23 2010-08-04 北京科技大学 Method for supporting filling body
CN101858084A (en) * 2010-07-05 2010-10-13 天津建岩岩土工程有限公司 Cement injection machine used for reinforcing and preventing leakage in underground tunnel construction
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CN103982214A (en) * 2014-05-26 2014-08-13 北方工业大学 Novel circular table-type anchor rod structure
CN103982214B (en) * 2014-05-26 2019-12-31 北方工业大学 Novel round platform type anchor rod structure
CN103982210B (en) * 2014-05-26 2018-12-28 北方工业大学 A kind of anchor rod anchored technology of cushion cap type
CN104074190B (en) * 2014-06-16 2016-10-05 成都四海岩土工程有限公司 A kind of secondary high-pressure slip-casting enlarged footing anchor pole and construction method
CN104074190A (en) * 2014-06-16 2014-10-01 成都四海岩土工程有限公司 Secondary high-pressure grouting expansion bit anchor rod and construction method thereof
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US10794183B2 (en) 2017-09-12 2020-10-06 China University Of Mining And Technology Self-drilling differential grouting combined bolt and anchoring method therefor
CN109252518A (en) * 2018-11-21 2019-01-22 黑龙江建筑职业技术学院 A kind of reducing anchor rod and its anchoring process
CN110055956A (en) * 2019-05-09 2019-07-26 徐泉 A kind of tree root pile constructing process and its implementing device
CN110284915A (en) * 2019-06-28 2019-09-27 江苏科技大学 A kind of imitative root-type anchor pole and its installation method
CN110700760A (en) * 2019-10-24 2020-01-17 福州大学 Multi-supporting-disc anchoring system hole expanding equipment and construction method
CN111779195A (en) * 2020-07-06 2020-10-16 青岛市地铁六号线有限公司 Novel prestressed anchorage cable expandable inner anchor head

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