CN201132955Y

CN201132955Y - Synchronized static pressure grouting precast pile device

Info

Publication number: CN201132955Y
Application number: CNU2007201381913U
Authority: CN
Inventors: 李建军; 梁仁旺
Original assignee: North University of China
Current assignee: North University of China
Priority date: 2007-12-05
Filing date: 2007-12-05
Publication date: 2008-10-15
Anticipated expiration: 2017-12-05

Abstract

The utility model relates to a pile-sinking device for a synchronous grouting static precast pile and belongs to the technical field of precast reinforced concrete piles in the field of construction. The pile-sinking device has the main technical characteristics that a definite length is reserved at the lower end of the precast pile, the lower end forms a grouting hole on the pile tip conical wall through a grout-guiding forked pipe 3, the outlet of the grouting hole faces upwards and presents an angle of 20 to 25 degrees with the level plane, the grout-guiding forked pipe is evenly and symmetrically distributed in the pile tip plane and the pile tip cone angle is 60 degrees. The pile-sinking device for a synchronous grouting static precast pile can achieve a continuous grouting to the pile side and the pile tip, the operation is simple and convenient and the grouting hole is hard to block, enabling the grouting to be carried out smoothly in different pile-sinking stages. During the process of pile sinking, the grout can be distributed between the pile tip and the soil around the pile to form a thin slurry film around the pile. When the pile reaches a designed depth, an expanded head wrapping the pile tip is formed at the pile end. The pile-sinking device for a synchronous grouting static precast pile expands the applied range of a static pile, reduces the construction cost and is applicable to loess, hard silty clay, hard silt, powdered fine sand and hardpan layers.

Description

Synchronous grouting Static Pressure Precast Piles device

Technical field

The utility model belongs to building field precast reinforced concrete piles technical field.

Technical background

Precast reinforced concrete piles and silent piling method thereof because of its noiseless, friction, speed of application is fast, pile quality is reliable, in China's soft clay area multistory building and highrise building, be applied comparatively widely, in recent years, along with in northern area is applied, find that static pressed pile is difficult to pass through intermediate gauge layer of sand and the hardpan in the mutual sedimentary facies in lake, river, pile driving pressure hour, stake presses not go down, increase pile driving pressure, pile body fractures easily; Adopt auxiliary pile sinking method such as bath method and soil digging method commonly used at present, reduced the compacted effect of static pressed pile again; When the stake end entered the layer of sand bearing stratum, because of " reinforcement " and " relaxing " effect of layer of sand, pressurization made end resistance very high, and after the unloading, end resistance decreases, and this brings the unstable and wayward two large problems of construction quality of bearing capacity.

In order to overcome an above-mentioned difficult problem, adopted the different sharp structures of stake, improve the pile sinking quality by improving the sharp grouting process of stake.

Publication number be CN1143137A patent disclosure the precast reinforced concrete piles end annotate the oar method, adopt the stake point to have only a downward injected hole, lead the slurry pipe and be positioned at the preformed pile tube wall.Publication number be CN1335434A patent disclosure high-pressure mortar spraying deposition process of prefabricated steel bar reinforced concrete pile, stake point be configured to heavy wall tubulose steel pipe gunite gun, head closed circular taper is opened some gunniting holes on the tube wall.The big grouting pressure of the notes oar pressure that said method adopts, gunniting hole is blocked easily.

The utility model content

The purpose of this utility model provides a kind of synchronous grouting Static Pressure Precast Piles pile sinking device, reduces the pile press tonnage, improves efficiency of construction, thereby has enlarged the range of application of static pressed pile, reduces construction costs.

The utility model is achieved in that synchronous grouting Static Pressure Precast Piles device, the lower end spud pile point 2 of preformed pile 1, grouting pipe 13 is positioned at preformed pile 1, grouting pipe 13 upper ends connect grouting pressure table 9 successively, grouting pump 10, circulating tank 11 and slurries mixer 12, Grouting Pipe 8 is arranged in grouting pipe 13, it is characterized in that: certain length in reserve is arranged in the preformed pile lower end, the lower end forms injected hole by leading slurry bifurcated pipe 3 at stake pointed cone wall, the injected hole outlet is upwards horizontal by 20 °～25 ° angles, lead the slurry bifurcated pipe and distribute symmetrically in stake point plane, stake pointed cone angle is 60 °.

Lead slurry pipe 13 or be positioned at preformed pile tube wall center, or be positioned at the preformed pile tube wall.

The structure of stake point can be that the rectangular pyramid shape is provided with 4 slip casting bifurcated

pipes

3, and 4 injected holes 4 are arranged.

The structure of stake point can also be a cone shape, and 3 slip casting bifurcated pipes 3 are set, and 3 injected holes 4 are arranged.

The utility model synchronous grouting Static Pressure Precast Piles device, stake point can be realized a side and the continuous slip casting of stake end for the make progress concrete pile point of injected hole of sidewall band opening, and is simple to operation, and be difficult for blocking injected hole, make slip casting be able to smooth implementation in the pile sinking different phase.In the stake sinking process, slurries can be evenly distributed between stake and all soil of stake, make and can form a mud film week.After stake arrives projected depth, make the stake end can form the enlarged footing of parcel stake point.The utility model has enlarged the range of application of static pressed pile, has reduced construction costs, is fit to loess, hard silty clay, hard silt, and powder fine sand, sandy gravel stratum use.

Description of drawings:

Fig. 1 is a synchronous grouting Static Pressure Precast Piles apparatus structure schematic diagram,

Fig. 2 is the structural representation of another embodiment of synchronous grouting Static Pressure Precast Piles device

Fig. 3 is that the sharp structural representation of slurry stake is led at the center,

Fig. 4 is that slurry rectangular pyramid body stake point A-A sectional structure schematic diagram is led at the center,

Fig. 5 is that slurry cone stake point A-A plan structure schematic diagram is led at the center,

Fig. 6 is that tube wall is led the sharp side-looking structural representation of slurry stake,

Fig. 7 is the vertical view of Fig. 6.

Specific implementation method

Be described further below in conjunction with accompanying drawing.1-preformed pile among the figure, 2-stake point, 3-slip casting bifurcated pipe, 4-injected hole, 5-stirrup, 6-longitudinal reinforcement, 7-stake point slip casting sleeve pipe, 8-Grouting Pipe, 9-grouting pressure table, 10-grouting pump, 11-circulating tank, 12-slurries mixer, 13-grouting pipe.

Embodiment 1:

With reference to accompanying drawing 1, Fig. 3 and Fig. 4, synchronous grouting Static Pressure Precast Piles device is made of preformed pile 1, stake point 2, grouting pipe 13, the sharp slip casting sleeve pipe 7 of stake, slip casting bifurcated pipe 3, injected hole 4, Grouting Pipe 8, grouting pressure table 9, grouting pump 10, circulating tank 11, slurries mixer 12, leads slurry pipe 13 or is positioned at preformed pile tube wall center.

Grouting pipe 13 can adopt steel pipe or withstand voltage pvc pipe, at the preformed pile two ends certain length in reserve is arranged, and the upper end connects grouting pressure table 9, grouting pump 10, circulating tank 11 and slurries mixer 12 successively.The lower end forms injected hole by leading slurry bifurcated pipe 3 at stake pointed cone wall, the injected hole outlet is upwards horizontal by 20 °～25 ° angles, lead the slurry bifurcated pipe and adopt 6 ' steel pipe, in stake point plane, distribute symmetrically, cast in cone angle and be in 60 ° the concrete precast pile point, precast pile tip will be complementary with stake footpath and profile.The structure of stake point is the rectangular pyramid shape, and 4 slip casting bifurcated pipes 3 are set, and 4 injected holes 4 are arranged.

Embodiment 2:

With reference to accompanying drawing 2, Fig. 6 and Fig. 7, grouting pipe 13 is embedded in the tube wall of prefabricated concrete pipe pile, adopts 6 ' steel pipe, can contemporary longitudinal reinforcement for preformed pile.Three grouting pipe are equilateral triangle and arrange in the slip casting tube wall, certain-length is reserved at two ends, three conduits of a side at the stake end meet at a bit to the bending of the tube wall center of circle simultaneously, spot-welded together, then conduit is continued to be bent upwards to offside, the injected hole outlet is upwards horizontal by 20 °～25 ° angles, and it is the precast pile tip at 60 ° of angles that casting concrete forms cone angle.

The structure of stake point is a cone shape, and 3 slip casting bifurcated pipes 3 are set, and 3 injected holes 4 are arranged.

Claims

1, synchronous grouting Static Pressure Precast Piles device, the lower end spud pile point (2) of preformed pile (1), grouting pipe (13) is positioned at preformed pile (1), grouting pipe (13) upper end connects grouting pressure table (9) successively, grouting pump (10), circulating tank (11) and slurries mixer (12), Grouting Pipe (8) is arranged in grouting pipe (13), it is characterized in that: certain length in reserve is arranged in preformed pile (1) lower end, the lower end forms injected hole (4) by leading slurry bifurcated pipe (3) at stake pointed cone wall, injected hole (4) (4) outlet makes progress and 20 °～25 ° angles of horizontal plane, lead slurry bifurcated pipe (3) and distribute symmetrically in stake point plane, stake pointed cone angle is 60 °.

2, according to the described synchronous grouting Static Pressure Precast Piles of claim 1 pile sinking device, it is characterized in that: lead slurry pipe (13) or be positioned at preformed pile tube wall center, or be positioned at the preformed pile tube wall.

3, according to the described synchronous grouting Static Pressure Precast Piles of claim 1 pile sinking device, it is characterized in that: the structure of stake point has 4 injected holes (4) for the rectangular pyramid shape is provided with 4 slip casting bifurcated pipes (3).

4, according to the described synchronous grouting Static Pressure Precast Piles of claim 1 pile sinking device, it is characterized in that: the structure of stake point is a cone shape, and 3 slip casting bifurcated pipes (3) are set, and 3 injected holes (4) are arranged.