CN103161153B - Powder spraying stirring formula anchoring pile and construction method - Google Patents
Powder spraying stirring formula anchoring pile and construction method Download PDFInfo
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- CN103161153B CN103161153B CN201310073235.9A CN201310073235A CN103161153B CN 103161153 B CN103161153 B CN 103161153B CN 201310073235 A CN201310073235 A CN 201310073235A CN 103161153 B CN103161153 B CN 103161153B
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Abstract
The invention discloses a kind of powder spraying stirring formula anchoring pile and construction method, anchoring pile comprises the hollow steel pipe that front end is closed, powder injection hole is had in hollow steel pipe front end, along having got through multiple through hole perpendicular to hollow steel pipe axis direction on hollow steel pipe tube wall, in each through hole, be interspersed with reinforcing bar, reinforcing bar and hollow steel pipe are welded and fixed.Construction method is that anchoring pile is aimed at soil layer, starts rig, makes anchoring pile creep into the soil body gradually from native top layer; While creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar be fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make the cement flour moisture absorbed in the steel pipe periphery soil body immediately improve the intensity of the soil body, the cement flour after water suction forms the higher cement-soil anchoring body of intensity through hydration reaction and anchoring pile; Avoid adopting grouting mode to cause in work progress and the cement solidifies after having constructed and soil cement intensity is still less than original soil intensity time destruction that the soil body is made.
Description
Technical field
The present invention relates to a kind of soil excavation, stability of slope and underground structure anti-floating resistance to plucking technical field, particularly relate to a kind of powder spraying stirring formula anchoring pile for bracing of foundation pit, slope reinforcement and underground structure resistance to plucking anti-floating and construction method.
Background technology
Plate brad supporting, bolt support widely use in Foundation Pit Support Engineering and stability of slope engineering, and plate brad supporting cost is low, easy construction, but the length of soil nailing and stake diameter less, the equal power of resistance to plucking is little, is only applicable to the area that soil property is good, so the scope of application is less, often can not meet design requirement; And the equal power of the length of anchor pole, diameter and resistance to plucking is all greater than soil nailing, but its cost is higher, and construction need through first holing, after insert metal material, then slip casting two procedures, disposablely can not complete, improve cost.
So, someone improves anchor pole, steel pipe is arranged to hollow shape, and is provided with flight on tube wall, tube wall offers injected hole, precession is on one side while inject cement paste, supporting construction once can be completed, but have processed complex, cost is higher, during screw-in, resistance is comparatively large, affects the shortcomings such as speed of application.And on weak soil or the higher stratum of water content, because the water content of foundation soil own is abundant, organic content is higher, and the cement paste injected is containing larger moisture content, thus cement-soil (i.e. anchoring body) intensity can be caused not high, and then affect anchor pole resistance to plucking effect.And foundation soil to be gone forward side by side stirring due to the injection of cement paste in the work progress of anchor pole, form the cement-soil mixture of flow-like, before cement-soil mixing slurry ot-yet-hardened reaches and has better intensity, slip casting type one-time formed anchor pole formation is adopted to cause great destruction, often because the construction of anchor pole directly causes the unstability of excavation slope, thus cause quality accidents.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, provide a kind of processing simple, when piercing soil, resistance is less, can improve speed of application, and effectively can improve powder spraying stirring formula anchoring pile and the construction method of foundation soil strength and anchoring body intensity fast.
Technical scheme of the present invention is achieved in that
A kind of powder spraying stirring formula anchoring pile, comprise hollow steel pipe, the front end of described hollow steel pipe is closed, on the tube wall of front end, powder injection hole is had at hollow steel pipe, along getting through multiple through hole running through hollow steel pipe perpendicular to hollow steel pipe axis direction on hollow steel pipe tube wall, in each through hole running through hollow steel pipe, be interspersed with reinforcing bar, described reinforcing bar and hollow steel pipe are welded and fixed.
As preferably, described through hole and reinforcing bar are uniformly distributed along hollow steel pipe length direction interval.Have employed such arrangement, make each section of steel pipe can play the effect of stirring soil, uniform force when making steel pipe rotary be assigned on every reinforcing bar, not only reduce the resistance be subject in whipping process, also make stir evenly, be beneficial to fully mixing of the cement flour soil layer higher with water content.
As preferably, in 2 adjacent between two reinforcing bars, wherein 1 reinforcing bar is mutually vertical with another 1 reinforcing bar.Make anchoring pile can play the stressed effect of stable equilibrium piercing in soil course, and can reduce anchoring pile rotate needed for driving force, and increase anchor pole resistance to plucking and destroy resistance thus improve anti-pulling of anchor bar; After piercing soil, because reinforcing bar is that serrated vertical is arranged, stronger draw anchor-hold effect so can play.
As preferably, the front end of hollow steel pipe is connected with drill bit.Thus it is faster to make to pierce soil.
In order to make reinforcing bar two ends force balance, as preferably, two of every root reinforcing bar is all exposed to outside through hole, and the middle part of reinforcing bar is interted in through hole.Not only two of every root reinforcing bar all can realize the effect of stirring soil, also makes the connection of reinforcing bar and hollow steel pipe more firm.
As preferably, two of every root reinforcing bar is all equal with the distance between hollow steel pipe axis.Thus make hollow steel pipe both sides stressed more balanced, be beneficial to stirring.
A construction method for powder spraying stirring formula anchoring pile, comprises the steps: (1), and anchoring pile as above is aimed at soil layer, then anchoring pile rear end is connected the unit head of rig; (2), start rig, unit head drives anchoring pile to rotate, and makes anchoring pile creep into the soil body gradually from native top layer; (3), while creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar be fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make the cement flour moisture absorbed in the steel pipe periphery soil body immediately improve the intensity of the soil body; (4), after anchoring pile pierces the soil body completely, stop injecting cement flour, unit head and anchoring pile are departed from, the cement flour after water suction forms the higher cement-soil anchoring body of intensity through hydration reaction and anchoring pile.
As preferably, the rate of penetration of anchoring pile is 0.4 ~ 1.5 m/min, and rig rotating speed is 10 ~ 60 revs/min, and the note powder pressure limit of powder spraying apparatus is 0.2 ~ 0.4MP.Have employed rational rate of penetration and dust pressure, being conducive to the even combination of cement flour and soil, ensure that construction quality.
The advantage that the present invention that have employed technique scheme has is:
1, processing is simple, and cost is low, and during screw-in soil, resistance is little, improves speed of application;
2, its length, stake diameter and the equal power of resistance to plucking are good, and diameter can reach 300mm, and when being applied to weak soil, diameter can reach more than 400mm, is thus applicable to the stratum of the various soil properties such as silt soil, cohesive soil, loess, sandy soil, is particularly useful for the stratum that water content is high;
3, can be used as the resistance to plucking anti-floating of vertical stake, the scope of application obtains further raising;
4, the present invention is laid with reinforcing bar on hollow steel pipe, by reinforcing bar Stirring soil, makes anchoring pile in the process going deep into soil, the soil everywhere touched in scope all can obtain uniform stirring, be beneficial to fully mixing of cement flour and moistening soil; Cement flour can after powder injection hole ejection in the stratum that water content is high moisture in absorbent earth, and avoid adopting grouting mode to cause in work progress and the cement solidifies after having constructed and soil cement intensity is still less than original soil intensity time destruction that the soil body is made, and then avoid slope instability now.
5, along being equipped with multiple through hole running through hollow steel pipe perpendicular to hollow steel pipe axis direction on hollow steel pipe tube wall, to intert in the middle part of reinforcing bar in through hole and to be welded and fixed with hollow steel pipe, reinforcing bar two is exposed to outside through hole, reinforcing bar is connected more firm with hollow steel pipe, when stirring, reinforcing bar is not easy to depart from hollow steel pipe, and more easily shapes.
Accompanying drawing explanation
Fig. 1 is the structural representation of anchoring pile in embodiment 1;
Fig. 2 is the A direction view of Fig. 1;
Fig. 3 is the application principle figure of anchoring pile in embodiment 2;
Fig. 4 is the B portion enlarged drawing of Fig. 3;
Fig. 5 is the structural representation of embodiment 1 hollow core steel pipe;
Fig. 6 is the structural representation of anchoring pile in embodiment 2.
Detailed description of the invention
The specific embodiment of the present invention is as follows:
Embodiment 1: a kind of powder spraying stirring formula anchoring pile, as shown in Figure 1, 2, comprise hollow steel pipe 1, the open rearward end of described hollow steel pipe 1, the front end of hollow steel pipe 1 is connected with a drill bit 2, part near front end on hollow steel pipe 1 is provided with many reinforcing bars 3, specifically, this part tube wall of the close front end of hollow steel pipe 1 is evenly provided with many reinforcing bars 3 along hollow steel pipe length direction interval, described reinforcing bar 3 is perpendicular with hollow steel pipe 1, in 2 adjacent between two reinforcing bars, wherein 1 reinforcing bar 3 is mutually vertical with another 1 reinforcing bar 3; Reinforcing bar 3 is connected in the following way with hollow steel pipe 1: as shown in Figure 5, namely on hollow steel pipe 1 tube wall, multiple through hole 6 running through hollow steel pipe is got through perpendicular to hollow steel pipe axis 7 direction in edge, the middle part of described reinforcing bar 3 to be interted in through hole 6 and is welded and fixed with hollow steel pipe 1, two of every root reinforcing bar 3 is all exposed to outside through hole 6, and the distance of two distance hollow steel pipe axis of reinforcing bar 3 is all equal; Have employed said structure makes anchoring pile overall processing simple, with low cost, and connects more firm; The tube wall of the anterior close drill bit 2 of hollow steel pipe 1 has powder injection hole 4.
The present invention is further improved on soil nailing and anchor rod construction process, be applicable to the soil that moisture is larger, powder injection hole 4 is got out in the front portion of hollow steel pipe 1, can moisture in absorbent earth in the stratum that water content is high after compressed air drives cement flour to spray from powder injection hole 4, and avoid adopting grouting mode to cause in work progress and the cement solidifies after having constructed and soil cement intensity is still less than original soil intensity time destruction that the soil body is made, and then avoid slope instability now.
Embodiment 2: as shown in Figure 6, the difference of the present embodiment and embodiment 1 is, whole hollow steel pipe 1 is uniformly distributed reinforcing bar 3, make whole section of hollow steel pipe can play the effect of stirring soil in traveling process, specifically, be evenly be provided with many reinforcing bars 3 along hollow steel pipe length direction interval on the tube wall of hollow steel pipe 1, described reinforcing bar 3 is perpendicular with hollow steel pipe 1.
As shown in Figure 3,4, the work progress of anchoring pile is as follows, and (1), aims at soil layer by anchoring pile, then anchoring pile rear end is connected the unit head of rig; (2), start rig, unit head drives anchoring pile to rotate, and makes anchoring pile creep into the soil body gradually from native top layer; (3), while creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar be fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make the cement flour moisture absorbed in the steel pipe periphery soil body immediately improve the intensity of the soil body; (4), after anchoring pile pierces the soil body completely, stop injecting cement flour, unit head and anchoring pile are departed from, the cement flour after water suction forms the higher cement-soil anchoring body of intensity through hydration reaction and anchoring pile.
Pierce in process, because reinforcing bar 3 is comparatively thin, amass little with soil contact, thus suffered resistance is little, thus can pierce fast.
When constructing, according to the geological conditions of soil layer, anchoring pile can being made full use of, meeting the requirement of bracing of foundation pit and slope reinforcement, when ensureing bracing of foundation pit and side slope consolidation projects construction is smooth, safe, reducing construction costs and cost; Separately vertically can construct, become resistance to plucking anti-float anchor rod, replace resistance to plucking anti-floating root pile, without mud, protection of the environment.
Claims (6)
1. a powder spraying stirring formula anchoring pile, comprise hollow steel pipe (1), the front end of described hollow steel pipe (1) is closed, on the tube wall of front end, powder injection hole (4) is had at hollow steel pipe (1), it is characterized in that: along getting through multiple through hole (6) running through hollow steel pipe perpendicular to hollow steel pipe axis direction on hollow steel pipe (1) tube wall, in each through hole (6) running through hollow steel pipe, be interspersed with reinforcing bar (3), described reinforcing bar (3) and hollow steel pipe (1) are welded and fixed; Two of every root reinforcing bar (3) is all exposed to through hole (6) outward, and the middle part of reinforcing bar (3) is interted in through hole (6); Two of every root reinforcing bar (3) is all equal with the distance between hollow steel pipe axis.
2. powder spraying stirring formula anchoring pile according to claim 1, is characterized in that: described through hole (6) and reinforcing bar (3) are uniformly distributed along hollow steel pipe length direction interval.
3. powder spraying stirring formula anchoring pile according to claim 1 and 2, is characterized in that: in 2 adjacent between two reinforcing bars, and wherein 1 reinforcing bar is mutually vertical with another 1 reinforcing bar.
4. powder spraying stirring formula anchoring pile according to claim 1, is characterized in that: the front end of hollow steel pipe (1) is connected with drill bit.
5. a construction method for powder spraying stirring formula anchoring pile, is characterized in that comprising the steps: (1), and the anchoring pile of any one as described in Claims 1 to 4 is aimed at soil layer, then anchoring pile rear end is connected the unit head of rig; (2), start rig, unit head drives anchoring pile to rotate, and makes anchoring pile creep into the soil body gradually from native top layer; (3), while creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar be fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make the cement flour moisture absorbed in the steel pipe periphery soil body immediately improve the intensity of the soil body; (4), after anchoring pile pierces the soil body completely, stop injecting cement flour, unit head and anchoring pile are departed from, the cement flour after water suction forms the higher cement-soil anchoring body of intensity through hydration reaction and anchoring pile.
6. the construction method of a kind of powder spraying stirring formula anchoring pile according to claim 5, it is characterized in that: the rate of penetration of anchoring pile is 0.4 ~ 1.5 m/min, and rig rotating speed is 10 ~ 60 revs/min, the note powder pressure limit of powder spraying apparatus is 0.2 ~ 0.4MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310073235.9A CN103161153B (en) | 2013-03-07 | 2013-03-07 | Powder spraying stirring formula anchoring pile and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310073235.9A CN103161153B (en) | 2013-03-07 | 2013-03-07 | Powder spraying stirring formula anchoring pile and construction method |
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| CN103161153A CN103161153A (en) | 2013-06-19 |
| CN103161153B true CN103161153B (en) | 2016-02-24 |
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| CN106120806A (en) * | 2016-06-30 | 2016-11-16 | 张继红 | A kind of composite steel tube taper pile construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201176593Y (en) * | 2008-03-28 | 2009-01-07 | 宁波大学地基处理中心 | Anchor rod for mixing soil-cement |
| CN201292529Y (en) * | 2008-11-14 | 2009-08-19 | 方远建设集团股份有限公司 | Mixing anchor rod |
| CN101806061A (en) * | 2010-03-16 | 2010-08-18 | 合肥工业大学 | Anchorage unit and construction method using same to ream ground anchor |
| CN201614595U (en) * | 2010-04-02 | 2010-10-27 | 郭财宝 | Rotation-type anchor tubular pile |
| CN203113321U (en) * | 2013-03-07 | 2013-08-07 | 郭财宝 | Powder-spraying stirring type anchor pile |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002138472A (en) * | 2000-11-01 | 2002-05-14 | Chiyoda Kogyo Kk | Anchor foundation pile |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201176593Y (en) * | 2008-03-28 | 2009-01-07 | 宁波大学地基处理中心 | Anchor rod for mixing soil-cement |
| CN201292529Y (en) * | 2008-11-14 | 2009-08-19 | 方远建设集团股份有限公司 | Mixing anchor rod |
| CN101806061A (en) * | 2010-03-16 | 2010-08-18 | 合肥工业大学 | Anchorage unit and construction method using same to ream ground anchor |
| CN201614595U (en) * | 2010-04-02 | 2010-10-27 | 郭财宝 | Rotation-type anchor tubular pile |
| CN203113321U (en) * | 2013-03-07 | 2013-08-07 | 郭财宝 | Powder-spraying stirring type anchor pile |
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