CN103161153A - Powder injection stirring type anchor pile and construction method - Google Patents
Powder injection stirring type anchor pile and construction method Download PDFInfo
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- CN103161153A CN103161153A CN2013100732359A CN201310073235A CN103161153A CN 103161153 A CN103161153 A CN 103161153A CN 2013100732359 A CN2013100732359 A CN 2013100732359A CN 201310073235 A CN201310073235 A CN 201310073235A CN 103161153 A CN103161153 A CN 103161153A
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Abstract
The invention discloses a powder injection stirring type anchor pile and a construction method. The anchor pile comprises a hollow steel tube with a closed front end, a powder injection hole is formed in the front end of the hollow steel tube, a plurality of through holes are formed in the tube wall of the hollow steel tube along the direction perpendicular to the axial direction of the hollow steel tube, reinforced ribs are inserted in the through holes in a penetrating mode, and the reinforced ribs are fixed with the hollow steel tube in a welded mode. The construction method is as follows: enabling the anchor pile to aim at a soil layer, starting a drilling machine, and enabling the anchor pile to gradually drill into the soil layer from the surface layer of soil; and in the process of drilling, injecting cement powder towards the soil body through the anchor pile by adopting a powder injection device, evenly stirring the cement powder with the soil body around the steel tube through the reinforced ribs fixed on the hollow steel tube, enabling the cement powder to absorb moisture in the soil body around the steel tube to improve strength of the soil body immediately, and forming a cement soil anchor body with higher strength through the cement powder and the anchor pile after the cement powder absorbs water. Thus, the phenomena that the soil body is damaged due to the facts that cement binding exists in construction process and after the construction process and the strength of cement soil is smaller than the strength of original soil by adopting a slip casting method can be avoided.
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, relate in particular to a kind of powder spraying stirring formula anchoring pile and job practices for bracing of foundation pit, slope reinforcement and underground structure resistance to plucking anti-floating.
Background technology
Plate brad supporting, bolt support are widely used in Foundation Pit Support Engineering and stability of slope engineering, and the plate brad supporting cost is low, easy construction, but the length of soil nailing and stake diameter are less, and the equal power of resistance to plucking is little, are only applicable to soil property good area, 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 needs through first boring, after insert metal material, then slip casting two procedures can not disposablely be completed, and has improved cost.
So, someone improves anchor pole, steel pipe is arranged to hollow shape, and is provided with flight on tube wall, offer injected hole on tube wall, precession on one side is injected water mud on one side, make supporting construction once to complete, but have processed complex, cost is higher, during screw-in, resistance is larger, affects the shortcomings such as speed of application.And on weak soil or water content higher stratum, because the water content of foundation soil own is abundant, organic content is higher, and the cement paste that injects contains larger moisture content, thereby can cause cement-soil (being anchoring body) intensity not high, and then affects anchor pole resistance to plucking effect.And foundation soil is due to the injection of the cement paste stirring of going forward side by side in the work progress of anchor pole, form the cement-soil mixture of flow-like, cement-soil mix the slurry ot-yet-hardened reach better intensity is arranged before, adopt the one-time formed anchor pole of slip casting type to cause great destruction to the stratum, tend to directly cause due to the construction of anchor pole the unstability of excavation slope, thereby 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 can effectively improve fast powder spraying stirring formula anchoring pile and the job practices of foundation soil strength and anchoring body intensity.
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 sealing of described hollow steel pipe, have powder injection hole at hollow steel pipe near on the tube wall of front end, a plurality of through holes that run through hollow steel pipe are got through perpendicular to the hollow steel pipe axis direction in the edge on the hollow steel pipe tube wall, be interspersed with reinforcing bar within each runs through the through hole of hollow steel pipe, described reinforcing bar and hollow steel pipe are welded and fixed.
As preferably, described through hole and reinforcing bar are evenly to distribute along hollow steel pipe length direction interval.Adopted such arrangement, make each section steel pipe can bring into play the effect of stirring soil, stressed being assigned to uniformly on every reinforcing bar when making steel pipe rotary, not only reduced the resistance that is subject in the whipping process, also make stirring more even, be beneficial to fully mixing of the higher soil layer of cement flour and water content.
As preferably, in 2 adjacent reinforcing bars, wherein 1 reinforcing bar is mutually vertical with another 1 reinforcing bar in twos.Make anchoring pile can play the stressed effect of stable equilibrium in piercing soil course, and can reduce the required driving force of anchoring pile rotation, thereby and increase the anchor pole resistance to plucking and destroy resistance and improve anti-pulling of anchor bar; After piercing soil, due to reinforcing bar for staggered vertically arranged, so can play the stronger anchor-hold effect of drawing.
As preferably, the front end of hollow steel pipe is connected with drill bit.To pierce soil faster thereby make.
In order to make reinforcing bar two ends force balance, as preferably, two of every reinforcing bar all is exposed to outside through hole, and intert in through hole at the middle part of reinforcing bar.Not only the effect of soil all can be realized stirring in two of every reinforcing bar, also makes reinforcing bar more firm with being connected of hollow steel pipe.
As preferably, two of every reinforcing bar all equates with distance between the hollow steel pipe axis.Thereby make hollow steel pipe both sides stressed more balanced, be beneficial to stirring.
A kind of job practices of powder spraying stirring formula anchoring pile comprises the steps: (1), and anchoring pile as above is aimed at soil layer, then the anchoring pile rear end is connected the unit head of rig; (2), start rig, unit head drives the anchoring pile rotation, makes anchoring pile creep into gradually the soil body from native top layer; (3), when creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar that is fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make cement flour absorb the intensity that moisture in the peripheral soil body of steel pipe improves the soil body immediately; (4), after anchoring pile pierces the soil body fully, stop injecting cement flour, unit head and anchoring pile are broken away from, the cement flour after 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 the rig rotating speed is 10～60 rev/mins, and the notes powder pressure limit of powder spraying apparatus is 0.2～0.4MP.Adopted rational rate of penetration and dusted pressure, being conducive to the even combination of cement flour and soil, having guaranteed construction quality.
Adopted the advantage that the present invention of technique scheme has to be:
1, processing is simple, and cost is low, and when screwing in soil, resistance is little, has improved 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, more than diameter can reach 400mm, thereby are applicable to the stratum of the various soil properties such as silt soil, cohesive soil, loess, sandy soil, are particularly useful for water content high stratum;
3, can be used as the resistance to plucking anti-floating of vertical, the scope of application has obtained further raising;
4, the present invention is laid with reinforcing bar on hollow steel pipe, by reinforcing bar Stirring soil, makes anchoring pile in going deep into the process of soil, the soil everywhere in the scope of touching all can obtain uniform stirring, be beneficial to fully mixing of cement flour and moistening soil; Cement flour can be after the powder injection hole ejection in water content high stratum moisture in absorbent earth, and avoid adopting grouting mode to cause in work progress and construction thes cement solidifies after completing and soil cement intensity is made the soil body during still less than original soil intensity destruction, and then avoid the slope instability of this moment.
5, the edge is equipped with a plurality of through holes that run through hollow steel pipe perpendicular to the hollow steel pipe axis direction on the hollow steel pipe tube wall, intert in the middle part of reinforcing bar and be welded and fixed in through hole and with hollow steel pipe, reinforcing bar two is exposed to outside through hole, make reinforcing bar be connected with hollow steel pipe more firm, when stirring, reinforcing bar is not easy to break away from hollow steel pipe, and more easily shapes.
Description of drawings
Fig. 1 is the structural representation of anchoring pile in embodiment 1;
Fig. 2 is that the A of Fig. 1 is to view;
Fig. 3 is the application principle figure of anchoring pile in embodiment 2;
Fig. 4 is the B section 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.
The specific embodiment
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, evenly be provided with many reinforcing bars 3 along hollow steel pipe length direction interval on this part tube wall of the close front end of hollow steel pipe 1, described reinforcing bar 3 is perpendicular with hollow steel pipe 1, in 2 adjacent reinforcing bars, wherein 1 reinforcing bar 3 is mutually vertical with another 1 reinforcing bar 3 in twos; Reinforcing bar 3 is connected in the following way with hollow steel pipe 1: as shown in Figure 5, namely a plurality of through holes 6 that run through hollow steel pipe are got through perpendicular to hollow steel pipe axis 7 directions in the edge on hollow steel pipe 1 tube wall, the middle part of described reinforcing bar 3 is interted and is welded and fixed in through hole 6 and with hollow steel pipe 1, two of every reinforcing bar 3 all is exposed to outside through hole 6, and two of reinforcing bar 3 all equates apart from the distance of hollow steel pipe axis; Adopted said structure to make the whole processing of anchoring pile simple, with low cost, and connected more firm; Have powder injection hole 4 on the anterior close tube wall of drill bit 2 of hollow steel pipe 1.
The present invention is further improved on soil nailing and anchor rod construction process, be applicable to the larger soil of moisture, get out powder injection hole 4 in the front portion of hollow steel pipe 1, compressed air drive cement flour can absorbent earth in water content high stratum after powder injection hole 4 ejections in moisture, and avoid adopting grouting mode to cause in work progress and construction thes cement solidifies after completing and soil cement intensity is made the soil body during still less than original soil intensity destruction, and then avoid the slope instability of this moment.
Embodiment 2: as shown in Figure 6, the difference of the present embodiment and embodiment 1 is, even distribution reinforcement 3 on whole hollow steel pipe 1, make whole section hollow steel pipe can play the effect of stirring soil in traveling process, specifically, be evenly to 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 Fig. 3,4, the work progress of anchoring pile is as follows, and (1) aims at soil layer with anchoring pile, then the anchoring pile rear end is connected the unit head of rig; (2), start rig, unit head drives the anchoring pile rotation, makes anchoring pile creep into gradually the soil body from native top layer; (3), when creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar that is fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make cement flour absorb the intensity that moisture in the peripheral soil body of steel pipe improves the soil body immediately; (4), after anchoring pile pierces the soil body fully, stop injecting cement flour, unit head and anchoring pile are broken away from, the cement flour after suction forms the higher cement-soil anchoring body of intensity through hydration reaction and anchoring pile.
Pierce in process, long-pending little with soil contact because reinforcing bar 3 is thinner, thereby suffered resistance is little, thus can pierce fast.
When construction, can take full advantage of anchoring pile according to the geological conditions of soil layer, satisfy the requirement of bracing of foundation pit and slope reinforcement, in the situation that assurance bracing of foundation pit and side slope consolidation projects construction are smooth, safe, reduce construction costs and cost; Separately can vertically construct, become the resistance to plucking anti-float anchor rod, replace resistance to plucking anti-floating root pile, without mud, protection of the environment.
Claims (8)
1. powder spraying stirring formula anchoring pile, comprise hollow steel pipe (1), the front end sealing of described hollow steel pipe (1), have powder injection hole (4) at hollow steel pipe (1) near on the tube wall of front end, it is characterized in that: a plurality of through holes (6) that run through hollow steel pipe are got through perpendicular to the hollow steel pipe axis direction in the edge on hollow steel pipe (1) tube wall, be interspersed with reinforcing bar (3) within each runs through the through hole (6) of hollow steel pipe, described reinforcing bar (3) is welded and fixed with hollow steel pipe (1).
2. powder spraying stirring formula anchoring pile according to claim 1 is characterized in that: described through hole (6) and reinforcing bar (3) are evenly to distribute along hollow steel pipe length direction interval.
3. powder spraying stirring formula anchoring pile according to claim 1 and 2, it is characterized in that: in 2 adjacent reinforcing bars, wherein 1 reinforcing bar is mutually vertical with another 1 reinforcing bar in twos.
4. powder spraying stirring formula anchoring pile according to claim 1, it is characterized in that: the front end of hollow steel pipe (1) is connected with drill bit.
5. powder spraying stirring formula anchoring pile according to claim 1, it is characterized in that: two of every reinforcing bar (3) all is exposed to outside through hole (6), and intert in through hole (6) at the middle part of reinforcing bar (3).
6. powder spraying stirring formula anchoring pile according to claim 5 is characterized in that: two of every reinforcing bar (3) all equates with distance between the hollow steel pipe axis.
7. the job practices of a powder spraying stirring formula anchoring pile, is characterized in that comprising the steps: (1), will aim at soil layer as the anchoring pile of any one as described in claim 1～6, then the anchoring pile rear end connected the unit head of rig; (2), start rig, unit head drives the anchoring pile rotation, makes anchoring pile creep into gradually the soil body from native top layer; (3), when creeping into, adopt powder spraying apparatus by anchoring pile to soil body jet cement powder, and by the reinforcing bar that is fixed on hollow steel pipe, the soil body of cement flour and steel pipe periphery is carried out uniform stirring, make cement flour absorb the intensity that moisture in the peripheral soil body of steel pipe improves the soil body immediately; (4), after anchoring pile pierces the soil body fully, stop injecting cement flour, unit head and anchoring pile are broken away from, the cement flour after suction forms the higher cement-soil anchoring body of intensity through hydration reaction and anchoring pile.
8. the job practices of a kind of powder spraying stirring formula anchoring pile according to claim 7, it is characterized in that: the rate of penetration of anchoring pile is 0.4～1.5 m/min, and the rig rotating speed is 10～60 rev/mins, and the notes powder pressure limit of powder spraying apparatus is 0.2～0.4MP.
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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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| CN201310073235.9A CN103161153B (en) | 2013-03-07 | 2013-03-07 | Powder spraying stirring formula anchoring pile and construction method |
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| CN103161153A true CN103161153A (en) | 2013-06-19 |
| CN103161153B CN103161153B (en) | 2016-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106120806A (en) * | 2016-06-30 | 2016-11-16 | 张继红 | A kind of composite steel tube taper pile construction method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002138472A (en) * | 2000-11-01 | 2002-05-14 | Chiyoda Kogyo Kk | Anchor foundation pile |
| 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 |
-
2013
- 2013-03-07 CN CN201310073235.9A patent/CN103161153B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002138472A (en) * | 2000-11-01 | 2002-05-14 | Chiyoda Kogyo Kk | Anchor foundation pile |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106120806A (en) * | 2016-06-30 | 2016-11-16 | 张继红 | A kind of composite steel tube taper pile construction method |
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| CN103161153B (en) | 2016-02-24 |
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