CN101158159A

CN101158159A - Whole-course hole-preguiding hammering entering-rock PHC pile tube construction process

Info

Publication number: CN101158159A
Application number: CNA2007101564711A
Authority: CN
Inventors: 刘小檀; 钱勇; 江守慈
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-31
Filing date: 2007-10-31
Publication date: 2008-04-09

Abstract

The invention relates to a construction technique of a whole course pre-guide-hole hammering an embedding PHC tube pile ,comprising: adopting a rotary pile machine with a long helix drilling rod according to the depth of a designed pile length; passing through an epipedon, a coarse sands layer and a gravel layer according to a designed and calculated diameter; drilling the pre-guide-hole to the designed depth of H; then reversing the rotary pile machine and taking out the long helix drilling rod to form an effect of making a wall inside the hole; when groundwater level is low, pouring yellow mud into the pre-guide-hole to form a mud protection wall inside the hole and taking out the long helix drilling rod as pouring the mud so as to ensure the hole not to collapse; later, adopting a hammering pile machine to hammer the PHC tube pile to pass through a surface layer into a strata until the designed depth of L of a foundation pile by aligning the full-depth pre-guide-hole. Under the hammering effect of the PHC tube pile, the full-depth pre-guide-hole of the invention smoothly passes through the epipedon and the gravel layer, reduces the pile tip resistance, eliminates the packing construction phenomena of the gravel layer, comes into the designed and required strata and achieves to create a straightway condition for the designed depth of the foundation pile.

Description

Whole-course hole-preguiding hammering entering-rock PHC tube pile construction technology

Technical field

The present invention relates to a kind of construction work PHC tube pile construction technology, particularly a kind of whole-course hole-preguiding hammering entering-rock PHC tube pile construction technology.

Background technology

At present, need to adopt the pile engineering development of a large amount of foundation piles rapid, and the PHC pile tube of suitability for industrialized production, compare with traditional concrete filling pile have quality directly perceived, be convenient to check, cheap, advantage such as the pile-formation process quality is easy to guarantee, short construction period, environmental protection and become the main force and the developing direction of present stake for building.Existing P HC tube pile construction technology is to rely on hammering stake machine and Pile feeder to adopt hammering method to make the PHC pile tube penetrate topsoil and the bigger coarse sand of thickness, gravelly sand, gravel layer, when entering the rock stratum, often occur because of sand, gravel bed compacted former thereby the stake end occurs and be difficult to penetrate this layer, thereby cause pile sinking can't make the stake end enter the rock stratum of designing requirement, being present in bearing capacity of single pile especially has relatively high expectations, necessarily require stake end to go in the object of construction production of rock in the design, thereby seriously hindered promoting the use of of advanced superior PHC pile tube.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of whole-course hole-preguiding hammering entering-rock PHC tube pile construction technology that can make pile tube penetrate topsoil and gravel layer smoothly.

For solving the problems of the technologies described above, technical scheme of the present invention is: it comprises following process steps;

1. according to the degree of depth of designing pile length, adopt the rotary stake machine that is installed in ground, belt length auger stem, press the design-calculated diameter, penetrate topsoil and coarse sands layer, gravel layer, will draw hole drill in advance to projected depth H; Draw bore dia in advance and determine, do not influence the frictional resistance of PHC pile tube periphery according to the existing mechanics parameter calculating of the thing of different soil;

2. with the long screw drill rod counter-rotating of rotary stake machine, propose long screw drill rod, form the effect of wall building in the hole,,, be difficult for the hole of collapsing by the hydraulic pressure retaining wall for the high stratum of groundwater table from drawing the hole in advance; Be lower than below the layer of sand 2 meters stratum for groundwater table, in screw rod counter-rotating proposition process, simultaneously inject yellow mud in the hole to drawing in advance by the centre bore of grouting pump by slip casting valve, Grouting Pipe and long screw drill rod, in the hole, form mud off, marginal not slurry limit proposes long screw drill rod, guarantees the hole of not collapsing, for the PHC pile tube penetrates topsoil and coarse sands layer, gravel layer smoothly under hammer action, enter the rock stratum, reach projected depth and create conditions;

3. aim at this full degree of depth and draw the hole in advance, employing hammering stake machine and Pile feeder, hammering PHC pile tube penetrate topsoil and coarse sands layer, gravel layer, enter the rock stratum of designing requirement, reach the projected depth L of foundation pile.

The invention has the beneficial effects as follows:

1. the full degree of depth draw in advance the hole be the PHC pile tube under hammer action, penetrate topsoil and coarse sands layer, gravel layer smoothly, enter the rock stratum of designing requirement, reach projected depth and create conditions; Avoid because of sandy gravel stratum compacted former thereby the stake end occurs and be difficult to penetrate this layer, thereby cause pile sinking can't make stake hold a predicament that enters the designing requirement rock stratum; Draw bore dia in advance and determine, do not influence the frictional resistance of PHC pile tube periphery according to the physical and mechanical parameter calculating of different soil.

2. in design stake depth bounds, adopt the rotary stake machine whole process of belt length auger stem that sandy gravel stratum is stirred pine, and utilize long screw drill rod to take out partly gravel, sand, end resistance when minimizing PHC pile tube penetrates this layer, and the compacted phenomenon of the construction of having eliminated sandy gravel stratum makes the PHC pile tube go into the rock standard what following of hammer action end can reach designing requirement.

3. when groundwater table is low, inject yellow mud in the hole to drawing in advance, form mud off in the hole, marginal not slurry limit proposes long screw drill rod, guarantees the hole of not collapsing.

Description of drawings

Fig. 1 is that the long screw auger bar drill of rotary stake machine draws the schematic diagram in hole in advance.

Fig. 2 is the schematic diagram that the long screw drill rod of rotary stake machine is drilled into the projected depth of drawing the hole in advance.

Schematic diagram when Fig. 3 is the long screw drill rod counter-rotating of rotary stake machine.

Schematic diagram when Fig. 4 is the long screw drill rod counter-rotating of rotary stake machine and slip casting.

Fig. 5 is that hammering stake machine hammering PHC pile tube is along the schematic diagram that draws hole piling in advance.

Fig. 6 is the schematic diagram that hammering stake machine hammering PHC pile tube enters the design rock stratum.

The specific embodiment

Below in conjunction with drawings and Examples the present invention is described in further detail.

Embodiment 1 is shown in Fig. 1,2,3,5,6: a kind of whole-course hole-preguiding hammering entering-rock PHC tube pile construction technology, be used for the high stratum of groundwater table, and comprise the following steps;

1. according to the degree of depth of designing pile length, employing is installed in ground (3), the strip length rotary stake machine (1) greater than 20 meters auger stem (2), press the design-calculated diameter, penetrate topsoil (4) and coarse sands layer (6), gravel layer (7), will draw hole (9) in advance and be drilled into the projected depth H that draws the hole in advance; Screw rod

2. with long screw drill rod (2) counter-rotating of rotary stake machine (1), propose long screw drill rod (2), form the effect of wall building in the hole,,, be difficult for the hole of collapsing by the hydraulic pressure retaining wall for the high stratum of groundwater table from drawing hole (9) in advance;

3. aim at this full degree of depth and draw hole (9) in advance, adopt hammer force greater than 6.2 tons hammering stake machine (13) and Pile feeder (14), hammering PHC pile tube (15) penetrates topsoil (4) and coarse sands layer (6), gravel layer (7), enters the rock stratum (8) of designing requirement, reaches the projected depth L of foundation pile.

Embodiment 2 is shown in Fig. 1-6: a kind of whole-course hole-preguiding hammering entering-rock PHC tube pile construction technology of slip casting comprises the following steps;

1. according to the degree of depth of designing pile length, employing is installed in ground (3), the strip length rotary stake machine (1) greater than 20 meters long screw drill rod (2), press the design-calculated diameter, penetrate topsoil (4) and coarse sands layer (6), gravel layer (7), will draw hole (9) in advance and be drilled into the projected depth H that draws the hole in advance;

2. the long screw drill rod (2) with rotary stake machine (1) reverses, from drawing hole (9) in advance long screw drill rod (2) is proposed, be lower than below the layer of sand 2 meters stratum for groundwater table, in screw rod counter-rotating proposition process, be that the centre bore of grouting pump (10) by slip casting valve (11), Grouting Pipe (12) and long screw drill rod (2) of 1-2Mpa injects yellow mud in drawing hole (9) in advance simultaneously by grouting pressure, form mud off in the hole, marginal not slurry limit proposes long screw drill rod (2); Guarantee the hole of not collapsing, for the PHC pile tube penetrates topsoil and coarse sands layer, gravel layer smoothly under hammer action, enter the rock stratum, the projected depth that reaches foundation pile creates conditions;

3. aim at this full degree of depth and draw hole (9) in advance, employing hammering stake machine (13) and Pile feeder (14), hammering PHC pile tube (15) penetrate topsoil (4) and coarse sands layer (6), gravel layer (7), enter the rock stratum (8) of designing requirement, reach the projected depth L of foundation pile.

Claims

1. the present invention relates to a kind of whole-course hole-preguiding hammering entering-rock PHC tube pile construction technology, comprise and adopt hammering stake machine, Pile feeder and hammering method to make the PHC pile tube enter the rock stratum, it is characterized in that: it also comprises following process steps;

1. according to the degree of depth of designing pile length, adopt the rotary stake machine (1) that is installed in ground (3), belt length auger stem (2), press the design-calculated diameter, penetrate topsoil (4) and coarse sands layer (6), gravel layer (7), will draw hole (9) drilling to completion H in advance;

2. the long screw drill rod (2) with rotary stake machine (1) reverses, propose long screw drill rod (2) or inject yellow mud by the centre bore of grouting pump (10) by slip casting valve (11), Grouting Pipe (12) and long screw drill rod (2) in drawing hole (9) in advance simultaneously from draw hole (9) in advance, marginal not is starched limit proposition long screw drill rod (2);