CN104846820A - End-bearing type threaded displacement pile forming equipment and pile forming construction method - Google Patents

End-bearing type threaded displacement pile forming equipment and pile forming construction method Download PDF

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Publication number
CN104846820A
CN104846820A CN201510304212.3A CN201510304212A CN104846820A CN 104846820 A CN104846820 A CN 104846820A CN 201510304212 A CN201510304212 A CN 201510304212A CN 104846820 A CN104846820 A CN 104846820A
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China
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pile
drilling rod
drill bit
slip casting
forming equipment
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CN201510304212.3A
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CN104846820B (en
Inventor
詹学启
杨松
李玉良
陈世刚
廖进星
张占荣
丁建荣
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China Railway Siyuan Survey and Design Group Co Ltd
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China Railway Siyuan Survey and Design Group Co Ltd
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Abstract

The invention discloses end-bearing type threaded displacement pile forming equipment and a pile forming construction method. The end-bearing type threaded displacement pile forming equipment and the pile forming construction method have the advantages that a 'solid base' is formed at the bottom of a pile body by means of ejecting cement paste at the bottom of the pile body, so that resistance of the bottom of the pile body is enhanced, and piercing of the bottom of the pile body is controlled effectively; a section of the formed pile body is thread-shaped, and a thread of the pile body is meshed with a soil thread beside a pile tightly, so that frictional resistance around the pile is improved obviously, vertical bearing capacity of the single pile is improved remarkably, the designed pile length can be decreased effectively, and engineering cost is reduced; pile forming is synchronously finished when pile body grouting is finished, so that construction period is shortened obviously, and construction efficiency is improved; soil beside the pile body is squeezed and densified during pile forming, so that performance of the soil around the pile body can be improved, a long-term function of a pile foundation is benefited, outward waste slag transport, site mud pollution and site mud treating are avoided fundamentally, and civilized construction is achieved.

Description

A kind of end holds type screw-type Squeezing Soil Pile pile-forming equipment and bore forming method
Technical field
The present invention relates to the Foundation Treatment fields such as railway, highway, Fang Jian, refer to that a kind of end holds type screw-type Squeezing Soil Pile pile-forming equipment and bore forming method particularly.
Background technology
The alluvial plain that China extensively distributes, stream terrace, the area such as coastal, place many cover by thick-layer ~ huge thick-layer Quaternary system alluvial deposit, formation lithology mostly is weak soil or the mollisol of silt clay, bury or loose shape silt or fine sand layer composition, its spreading depth is large, stratum is weak, the pile foundation of the engineerings such as the railway built under this geological conditions, highway or Fang Jian mostly generally is friction pile, stake end cannot be placed on the hard end or basement rock, because stake all stratum weakness, stake end are without hard formation, often cause a footpath or stake long comparatively large, construction investment is many.
Current existing pile foundation pile type can be divided into hand excavated pile, pre cast pile and bored pile three major types, wherein for above-mentioned thick-layer weak soil or mollisol stratum, hand excavated pile and pre cast pile are limited by formation condition, underground water is grown and the long factor such as larger of stake and cannot adopting; And the pile-formation process of bored pile can be divided into construction technology and the pile-forming equipments thereof such as Churn drill, rotary drilling, auger (long spire and short spiral), wherein Churn drill, rotary drilling creep into for being to fetch earth, creep into the easy collapse hole of king-pile week soft stratum, liquefaction or shrinkage cavity, pile is more difficult and pile quality is poor, the stake end, sinks quarrel and is difficult to remove thoroughly, and spoir and body refuse will pollute construction plant simultaneously; When adopting auger bore, soil compaction is crept into, and can improve the engineering properties of soil around pile, but cannot improve stake and hold following formation condition, auger is limited by machine power simultaneously, constrains the degree of depth or the length of pile.
Therefore, existing pile-forming equipment and construction thereof are difficult to the technical requirements or the engineering demand that meet Deep Thick Soft Ground or soft foundation reinforcing.
Summary of the invention
Object of the present invention is exactly the deficiency that will solve above-mentioned background technology, provides a kind of end to hold type screw-type Squeezing Soil Pile pile-forming equipment and bore forming method, can improve stake and hold following formation condition, increase end resistance, long to reduce stake, reduces engineering cost.
Technical scheme of the present invention is: a kind of end holds type screw-type Squeezing Soil Pile pile-forming equipment, comprise drilling tool and grouting equipment, it is characterized in that: described drilling tool comprises drilling rod, described drilling rod is provided with through slip casting passage along axis, the grouting port of described slip casting passage upper end and grouting equipment is connected, described slip casting passage lower end and drill bit hinged, described slip casting passage lower end is sealed by described drill bit; The shaft of described drilling rod is provided with the through injected hole of multiple axis along axis, and the grouting port of described injected hole upper end and grouting equipment is connected, and described injected hole lower end correspondence is connected with nozzle.
Further, described drill bit is tapered, and described bit upper end side is by loose-leaf and described drilling rod bottom-hinged, and the symmetrical opposite side of described bit upper end is by removably connecting bottom knocker and described drilling rod.
Preferably, described knocker comprises connecting rod, back-up block and support bar, one end and the described bit upper end side of described connecting rod are welded to connect, described back-up block is provided with two, described back-up block to be fixedly installed on bottom described drilling rod and to be symmetricly set on described connecting rod other end both sides, described back-up block is along described connecting rod vertical direction is provided with through hole, and the two ends of described support bar are supported by two back-up blocks respectively, and the described connecting rod other end is shelved in the middle part of described support bar.
Preferably, multiple described slip casting passage is circumferentially equidistantly arranged
Further, the shaft outer wall of described drilling rod is provided with spiral rotating vane.
Preferably, the diameter of described slip casting passage is 150mm ~ 200mm, and described injected hole internal diameter is 8 ~ 10mm; Diameter and the described injected hole internal diameter of described nozzle match.
Utilize above-mentioned end to hold a construction method for type screw-type Squeezing Soil Pile pile-forming equipment pile, it is characterized in that, comprise the following steps:
1), drilling tool boring to projected depth, simultaneously by design proportioning prepare cement paste;
2), by the cement paste prepared carry along injected hole, cement paste sprays from nozzle, reversely rotates simultaneously and promotes drilling rod, forms cement mortar end at the bottom of stake and holds body;
3), hold after body meets construction requirement until cement mortar end, stop to injected hole conveying cement paste;
4), drilling rod reversely rotates and upwards slowly promotes, and drill bit departs under gravity with bottom drilling rod, and concrete adopts pumping mode to be rapidly to drilling rod along slip casting passage and to pour into subsequently, forms pile body, until stake top is to design elevation position, completes pile body and build.
Further, step 4) in, after departing from bottom drill bit and drilling rod, vertically plug the reinforcing cage that several are positioned at slip casting passage, at the bottom of reinforcing cage lower end enters into, cement mortar end holds body, after pile body has been built, cement mortar end at the bottom of stake has been held body and has been fixedly connected with pile body by reinforcing cage.
Preferably, the shaft outer wall of described drilling rod is provided with spiral rotating vane, when drilling rod reverse rotation upwards slowly promotes, forms screw-type pile body.
Adopt the pile body that pile-forming equipment of the present invention and bore forming method are formed, can make to form " the hard end " bottom pile body by gunite bottom pile body, increase pile body base drag and supporting capacity, effectively control thrusting bottom pile body; Simultaneously because pile body cross section after pile is screw thread form, pile body screw thread is closely engaged with Pile side soil screw thread, and can significantly improve pile perimeter resistance, therefore vertical bearing capacity of single pile is significantly increased, and effectively can shorten designing pile length, reduces construction costs.Pile and pile body slip casting synchronously complete and obviously can shorten the construction period in addition, improve construction efficiency; Be squeezed at the formation of pile Lateral soil body simultaneously, encryption effect, can improve the performance of pile peripheral earth, be conducive to the long term of pile foundation, also fundamentally avoid waste outward transport, place mud contamination and process, accomplished civilized construction.
Accompanying drawing explanation
Fig. 1 is pile-forming equipment structural representation of the present invention;
Fig. 2 is the elevational schematic view of Fig. 1;
Fig. 3 is pile body schematic diagram after pile;
Fig. 4 is loose-leaf structure schematic diagram of the present invention;
Fig. 5 is Bolting structure elevational schematic view of the present invention;
Fig. 6 is the schematic side view of Fig. 5.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
With reference to figure 1, Fig. 2 and Fig. 3, the one end of the present embodiment holds type screw-type Squeezing Soil Pile pile-forming equipment, mainly comprise drilling tool and grouting equipment, drilling tool is the instrument of holing in Deep Thick Soft Ground or soft foundation, it comprises drilling rod 1, drilling rod 1 is provided with through slip casting passage 2 along axis, the diameter of slip casting passage 2 is 150mm ~ 200mm, slip casting passage 2 is mainly used to delivering concrete slurry in order to form pile body 9, the grouting port of slip casting passage 2 upper end and grouting equipment is connected, slip casting passage 2 lower end and drill bit hinged, drill bit 6 has open and close function, when holing, drill bit 6 is in closed condition, now slip casting passage 2 lower end is sealed, slip casting passage 2 is entered to prevent foreign material etc., ensure that pile body 9 is formed by concreting completely, when drilling rod promotes, drill bit 6 is open mode, do not affect concrete pouring into, the shaft of drilling rod 1 is provided with the through injected hole of multiple axis 4 along axis, injected hole 4 internal diameter is 8 ~ 10mm, the grouting port of injected hole 4 upper end and grouting equipment is connected, injected hole 4 lower end correspondence is connected with nozzle 5, diameter and injected hole 4 internal diameter of nozzle 5 match, injected hole 4 is mainly used to carry cement paste, cement paste sprays from nozzle 5, form cement mortar end and hold body 10, can support for being formed bottom follow-up pile body 9 of building " the hard end " formula, to increase pile body 9 base drag and supporting capacity, effectively control thrusting bottom pile body 9.
The drill bit 6 of the present embodiment is tapered, drill bit 6 upper end is the plane matched with slip casting passage 2 cross section, side, drill bit 6 upper end is by loose-leaf 8 (with reference to figure 4) and drilling rod 1 bottom-hinged, and the symmetrical opposite side in drill bit 6 upper end is by removably connecting bottom knocker 7 and drilling rod 1.When drilling rod 1 upwards promotes, under the Action of Gravity Field of drill bit 6, the side that drill bit 6 upper end is positioned at knocker 7 can depart from drilling rod 1, and the side that drill bit 6 upper end is positioned at loose-leaf 8 can overturn, to make bottom drill bit 6 and drilling rod 1 in vertical state, and promote together with drill bit 6, use for next time.
With reference to figure 5 and Fig. 6, the knocker 7 of the present embodiment comprises connecting rod 7.1, back-up block 7.2 and support bar 7.3, one end and the side, drill bit 6 upper end of connecting rod 7.1 are welded to connect, back-up block 7.2 is provided with two, to be fixedly installed on bottom drilling rod 1 and to be symmetricly set on connecting rod 7.1 other end both sides, back-up block 7.2 is provided with through hole 7.4 along with connecting rod 7.1 vertical direction, and the two ends of support bar 7.3 are supported by two back-up blocks 7.2 respectively, and the described connecting rod other end is shelved in the middle part of described support bar.In drilling rod 1 upwards lifting process, under the Action of Gravity Field of drill bit 6, support bar 7.3 can be fractureed, thus the side making drill bit 6 upper end be positioned at knocker 7 can depart from drilling rod 1, and form drill bit 6 and be vertical state bottom drilling rod 1.
The shaft outer wall of the drilling rod 1 of the present embodiment is provided with spiral rotating vane 3, the pile body of follow-up pile body of building is also in shape of threads, screw thread pile body is closely engaged with Pile side soil screw thread, pile perimeter resistance can be significantly improved, therefore vertical bearing capacity of single pile is significantly increased, effectively can shorten designing pile length, reduce construction costs.
The grouting equipment of the present embodiment is the equipment for high-pressure slip-casting, comprises the compositions such as pulper, high pressure slurry pump, slip casting flexible pipe, nozzle, flow meter.Cement paste generates at pulper, to be delivered to the injected hole 4 in drilling rod 1, then to be sprayed by nozzle 5 by high pressure slurry pump through slip casting flexible pipe, injects stake end soft base stratum and forms high-pressure slip-casting end and hold body 10 (as shown in Figure 3).
Utilize above-mentioned end to hold a construction method for type screw-type Squeezing Soil Pile pile-forming equipment pile, comprise the following steps:
1), according to the position of surveying setting-out by place for drilling rod 1, the deviation of drill bit 6 position and design attitude should not be greater than 5cm; Drilling rod 1 rear leveling in place is also firm, and guarantee the verticality of drilling rod 1, its perpendicularity deviation should not be greater than 1%; Drilling tool boring is to projected depth: drilling rod 1, together with in screw thread blade 3 going down process, should strictly control drilling rod 1 decrease speed and rotary speed, and drilling rod 1 is mated together with screw thread blade 3, requires that drilling rod 1 rotates a circle, and decline a pitch, until projected depth;
2) after the drill bit 6, bottom drilling rod 1 arrives projected depth, the cement paste prepared is carried along injected hole, cement paste is sprayed by the multiple shower nozzles 5 bottom drilling rod 1, reversely rotate simultaneously and promote drilling rod 1, for cement paste provides Injection Space, control expulsion pressure according to geological conditions and Test Piles, hold body 10 to form cylindrical cement mortar end at the bottom of stake as shown in Figure 3;
3), when truncated cone-shaped cement mortar end at the bottom of stake hold body 10 thickness meet design inspection calculate requirement after, stop gunite; Drilling rod 1 reversely rotates and upwards slowly promotes, knocker 7 departs under gravity with bottom drilling rod 1, make drill bit 6 along hinge 8 Unscrew, adopt pumping mode to be rapidly to drilling rod 1 along slip casting passage 2 concrete prepared subsequently to pour into, concrete fills up the shape of threads space produced by drilling rod 1 rotary lifting, generates screw thread concrete pile body 9 as shown in Figure 3; Reversely rotate in the process promoted at drilling rod 1, should strictly control drilling rod hoisting velocity and rotary speed, keep synchronous and coupling;
4), carry being drilled into when drill bit 6 reaches design of pile top absolute altitude and stop concrete conveyance, but should consider to pour into surplus.
The step 4 of above-mentioned embodiment) in, after departing from bottom drill bit 6 with drilling rod 1, vertically plug the reinforcing cage 11 that several are positioned at slip casting passage 2, at the bottom of reinforcing cage 11 lower end enters into, cement mortar end holds body 10, after pile body 9 has been built, cement mortar end at the bottom of stake is held body 10 and is fixedly connected with pile body 9 by reinforcing cage 11, to strengthen the stability of pile body 9.
In addition, the present embodiment pile and pile body slip casting synchronously complete and obviously can shorten the construction period, improve construction efficiency; Be squeezed at the formation of pile Lateral soil body simultaneously, encryption effect, can improve the performance of pile peripheral earth, be conducive to the long term of pile foundation, also fundamentally avoid waste outward transport, place mud contamination and process, accomplished civilized construction.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to structure of the present invention.Every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical scheme of the present invention.

Claims (9)

1. an end holds type screw-type Squeezing Soil Pile pile-forming equipment, comprise drilling tool and grouting equipment, it is characterized in that: described drilling tool comprises drilling rod (1), described drilling rod (1) is provided with through slip casting passage (2) along axis, the grouting port of described slip casting passage (2) upper end and grouting equipment is connected, described slip casting passage (2) lower end and drill bit (6) hinged, described slip casting passage (2) lower end is sealed by described drill bit (6); The shaft of described drilling rod (1) is provided with the through injected hole of multiple axis (4) along axis, the grouting port of described injected hole (4) upper end and grouting equipment is connected, and described injected hole (4) lower end correspondence is connected with nozzle (5).
2. end according to claim 1 holds type screw-type Squeezing Soil Pile pile-forming equipment, it is characterized in that: described drill bit (6) is tapered, described drill bit (6) upper end is the plane matched with described slip casting passage (2) cross section, described bit upper end side is by loose-leaf (8) and described drilling rod (1) bottom-hinged, and the symmetrical opposite side in described drill bit (6) upper end is removably connected by knocker (7) and described drilling rod (1) bottom.
3. end according to claim 2 holds type screw-type Squeezing Soil Pile pile-forming equipment, it is characterized in that: described knocker (7) comprises connecting rod (7.1), back-up block (7.2) and support bar (7.3), one end and described drill bit (6) side, upper end of described connecting rod (7.1) are welded to connect, described back-up block (7.2) is provided with two, described back-up block (7.2) is fixedly installed on described drilling rod (1) bottom and is symmetricly set on described connecting rod (7.1) other end both sides, described back-up block (7.2) is along described connecting rod (7.1) vertical direction is provided with through hole (7.4), the two ends of described support bar (7.3) are supported by two back-up blocks (7.2) respectively, described connecting rod (7.1) other end is shelved on described support bar (7.3) middle part.
4. end according to claim 1 holds type screw-type Squeezing Soil Pile pile-forming equipment, it is characterized in that: multiple described slip casting passage (2) is circumferentially equidistantly arranged.
5. one end according to claim 1 holds type screw-type Squeezing Soil Pile pile pile-forming equipment, it is characterized in that: the shaft outer wall of described drilling rod (1) is provided with spiral rotating vane (3).
6. one end according to claim 1 holds type screw-type Squeezing Soil Pile pile pile-forming equipment, it is characterized in that: the diameter of described slip casting passage (2) is 150mm ~ 200mm, and described injected hole (4) internal diameter is 8 ~ 10mm; Diameter and described injected hole (4) internal diameter of described nozzle (5) match.
7. utilize the end described in claim 1 to hold a construction method for type screw-type Squeezing Soil Pile pile-forming equipment pile, it is characterized in that, comprise the following steps:
1), drilling tool boring to projected depth, simultaneously by design proportioning prepare cement paste;
2), by the cement paste prepared carry along injected hole (4), cement paste, from nozzle (5) ejection, reversely rotates simultaneously and promotes drilling rod (1), forms cement mortar end at the bottom of stake and holds body (10);
3), hold after body (10) meets construction requirement until cement mortar end, stop to injected hole (4) conveying cement paste;
4), drilling rod (1) reversely rotates and upwards slowly promotes, drill bit departs from drilling rod (1) bottom under gravity, the pumping mode of concrete employing is subsequently rapidly to drilling rod (1) along slip casting passage (2) and pours into, form pile body (9), until stake top is to design elevation position, completes pile body and build.
8. a kind of end according to claim 7 holds the construction method of type screw-type Squeezing Soil Pile pile-forming equipment pile, it is characterized in that: step 4) in, after drill bit and drilling rod (1) bottom depart from, vertically plug several reinforcing cages being positioned at slip casting passage (2) (11), at the bottom of reinforcing cage (11) lower end enters into, cement mortar end holds body (10), after pile body (9) has been built, cement mortar end at the bottom of stake has been held body (10) and has been fixedly connected with pile body (9) by reinforcing cage (11).
9. a kind of end according to claim 6 holds the construction method of type screw-type Squeezing Soil Pile pile-forming equipment pile, it is characterized in that: the shaft outer wall of described drilling rod (1) is provided with spiral rotating vane (3).
CN201510304212.3A 2015-06-04 2015-06-04 Hold type screw-type Squeezing Soil Pile pile-forming equipment and bore forming method in a kind of end Active CN104846820B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108867307A (en) * 2018-06-22 2018-11-23 四川先舟建设工程有限公司 Municipal concrete steel structure road and bridge and its installation method
CN114250769A (en) * 2021-11-05 2022-03-29 陕西铁道工程勘察有限公司 Pile forming process for large-head compaction pile
CN114737559A (en) * 2022-04-06 2022-07-12 河海大学 Multidirectional-load-resistant small precast pile foundation and construction method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533279A (en) * 1983-05-12 1985-08-06 Fundemantum B.V. Method for making a foundation pile
CN2538851Y (en) * 2002-07-19 2003-03-05 周茂胜 Device for forming special shaped pile by drilling high-pressure jetting reaming and pressure concreting
CN2883648Y (en) * 2005-06-29 2007-03-28 刘润郊 Drill for drilling, pumping large flowing concrete and jetting slurry forming pile
CN203559413U (en) * 2013-11-22 2014-04-23 宁波鸿晨建设有限公司 End-expanded type long spiral drilling hole pressure pouring pile and construction device thereof
CN204662430U (en) * 2015-06-04 2015-09-23 中铁第四勘察设计院集团有限公司 A kind of end holds type screw-type Squeezing Soil Pile pile-forming equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533279A (en) * 1983-05-12 1985-08-06 Fundemantum B.V. Method for making a foundation pile
CN2538851Y (en) * 2002-07-19 2003-03-05 周茂胜 Device for forming special shaped pile by drilling high-pressure jetting reaming and pressure concreting
CN2883648Y (en) * 2005-06-29 2007-03-28 刘润郊 Drill for drilling, pumping large flowing concrete and jetting slurry forming pile
CN203559413U (en) * 2013-11-22 2014-04-23 宁波鸿晨建设有限公司 End-expanded type long spiral drilling hole pressure pouring pile and construction device thereof
CN204662430U (en) * 2015-06-04 2015-09-23 中铁第四勘察设计院集团有限公司 A kind of end holds type screw-type Squeezing Soil Pile pile-forming equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108867307A (en) * 2018-06-22 2018-11-23 四川先舟建设工程有限公司 Municipal concrete steel structure road and bridge and its installation method
CN114250769A (en) * 2021-11-05 2022-03-29 陕西铁道工程勘察有限公司 Pile forming process for large-head compaction pile
CN114737559A (en) * 2022-04-06 2022-07-12 河海大学 Multidirectional-load-resistant small precast pile foundation and construction method
CN114737559B (en) * 2022-04-06 2023-10-13 河海大学 Multidirectional load-resistant small precast pile foundation and construction method

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