CN101324065A - Paste-slurry pumping bored pile technological process - Google Patents
Paste-slurry pumping bored pile technological process Download PDFInfo
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- CN101324065A CN101324065A CNA2008101177215A CN200810117721A CN101324065A CN 101324065 A CN101324065 A CN 101324065A CN A2008101177215 A CNA2008101177215 A CN A2008101177215A CN 200810117721 A CN200810117721 A CN 200810117721A CN 101324065 A CN101324065 A CN 101324065A
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- ascending pipe
- bored
- pumping
- slurry pumping
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Abstract
The invention provides a paste-pulp pressure filling pile technical method, comprising the steps as follows: step 1: steel pipes are inserted into stratum required by the construction by a boring device; after an injection tube is inserted, the next injection tube is connected by a sealing joint before the subsequent injection tube is inserted, till the injection tube is inserted at the foundation disposal depth required by the construction; step 2: the paste-pulp pressure filling material is prepared; step 3: the outlet pipeline of a high-pressure injection pump is connected with the upper end of the injection tube; step 4: the paste-pulp pressure filling material is conveyed into the injection tube; step 5: after the high pressure injection pump conveying the paste-pulp pressure filling material exceeds a certain pressure, the injection tube is pulled upwards by 30-50mm and the pulp pumping operation is carried out continuously; the operation is repeatedly carried out: the next injection tube is removed when one injection tube is completed till all injection tubes are removed, then the construction of one pile is completed. The method of the invention achieves the effect of forming high-strength structure body and the composite foundation to bear the building foundation by compressing and extruding the soil according to pouring quantity so as to increase the original foundation density and the poured paste-pulp ball roots.
Description
Technical field
The invention belongs to a kind of paste-slurry pumping bored pile technological process.
Background technology
At present, the ground of Beijing area highrise building more than 20 layers is handled and is adopted long spiral pump Superfluid state concrete castinplace pile (being called for short the CFG stake) morely.The bore forming of CFG stake: adopt long auger, reach projected depth after, promote long screw drill rod, carry the Superfluid state concrete pile with pump simultaneously.At present, the problem that mainly exists of this method is:
1, for the auger stake of fetching earth, inter-pile soil there is not squeezing action.Stake soil is passive combination, acting in conjunction, and the intensity of pile is not high.
2, scope of application limitation is big, is only applicable to softer soil layer (bury that intensity is lower, clay, powder fine sand etc.) relatively, is not suitable for to contain the higher soil layer of gravel amount, the higher (180-220KN/m of intensity
2) clay, aquifer that soil body osmotic coefficient K value is bigger or the like.
Summary of the invention
The object of the present invention is to provide a kind of paste-slurry pumping bored process that can form the high strength pile body.
For achieving the above object, the present invention takes following technical scheme:
A kind of paste-slurry pumping bored process, this method comprises the steps:
First step inserts ascending pipe in the stratum of construction requirement with rig, and ascending pipe of every insertion, and connect a back ascending pipe again with seal nipple continues to insert a back ascending pipe, until be inserted into handle the degree of depth according to the ground of construction requirement till;
Second step stirs by mixing plant with cement, sand, clay and water, makes paste-slurry pumping bored material;
Third step connects the outlet of high head injection pump by the upper port of pipeline with last root ascending pipe that inserts ground;
The 4th step is transported to paste-slurry pumping bored material in the ascending pipe by high head injection pump, pipeline, and is input in the stratum by ascending pipe;
The 5th step after high head injection pump carries paste-slurry pumping bored material to surpass the pressure of setting, is suspended pumping, upwards extracts ascending pipe 30-50 millimeter, continues pumping again; After high head injection pump reaches the pressure of setting again, suspend pumping again, upwards extract ascending pipe 30-50 millimeter, continue pumping again, carry out repeatedly, and finish an ascending pipe, pull down an ascending pipe, one until pulling down all ascending pipes, and paste-slurry pumping bored material is filled with the aperture end, and a pile finishes.
The slump of made paste-slurry pumping bored material is 0cm-5cm in described second step.
In described the 4th step, high head injection pump is with 40kg/cm
2-70kg/cm
2Pressure be transported in the ascending pipe; In described the 5th step, the pressure of described setting is 70kg/cm
2
In described the 4th step, the 5th step, it is 0.5～12.0ft that high head injection pump is carried the injection rate of paste-slurry pumping bored material
3/ min.
In described the 4th step, the 5th step, it is to decide with different landform according to different soil properties that high head injection pump is carried the injection rate of paste-slurry pumping bored material, and containing the mud of clay or the injection rate of loam soil property is 0.5～1.0ft
3/ min; The soil property of draining such as the injection rate of sandy soil layer or dry soil property such as powder soil horizon are 1.0～4.0ft easily
3/ min; The space greatly, looser soil property such as the injection rate of loess be 4.0～12.0ft
3/ min.
In described first step, the ascending pipe that adopts is that internal diameter is
50-70mm, length is one meter steel pipe.
Advantage of the present invention is:
(1), ascending pipe is set by small-sized rig, equipment is simple, is convenient to operation, and by ascending pipe inter-pile soil is formed extruding.
(2), the situ configuration slump is the paste-slurry pumping bored material of lazy flow of 0cm-5cm, this material can not separate in water yet; And use 40kg/cm
2-70kg/cm
2Pressure be pressed in the ascending pipe, manage certainly the end up segmentation promote and to finish, simple, convenient.
(3), rely on the cream slurry napiform root of promoting original place base density and perfusion by groundwater increment compression, extruding soil to form the high-strength structure body, form composite foundation and support the structure base effect.
Paste-slurry pumping bored process of the present invention can be applied to field of water conservancy, cut as the built on stilts stratum of the boulder in the Hydraulic and Hydro-Power Engineering, rivers ooze, the antiseepage of deep covering layer is handled or the like under the dam foundation.Also can be applied to offshore engineering, as in cut into a mountain backfill or ecosystem soft layer, using paste-slurry pumping bored process of the present invention.Paste-slurry pumping bored process of the present invention has the characteristics of maneuverability, is subjected to the construction environment less-restrictive, can be widely used in industry and civilian construction field.Paste-slurry pumping bored process of the present invention has good expansion basis, can be used for replacing shaking towards concrete pile (VCC), and the suitable degree of depth can increase substantially.
Description of drawings
Fig. 1 is the schematic flow sheet of paste-slurry pumping bored process of the present invention.
The specific embodiment
Adopt equipment such as small-sized rig, mixing plant, high head injection pump.Wherein, high head injection pump also claims the high pressure grouting pump, and what present embodiment used is that German general thatch maistre is produced TK15 type high pressure grouting pump; Rig adopts the crawler belt geological drilling rig, is the auger (JBM-250) that Korea S produces, and its drilling depth is more than 150 meters, and the hole gauge lattice of boring are the sleeve pipe size specification of 50mm-70mm.
Adopting mixing plant is the paste-slurry pumping bored material of 0cm-5cm with the coarse aggregate below the 10mm and viscosity fine earth (for the following clay of 4mm) mixed cement and the on-the-spot preparation of water structure slump value.
Present embodiment is to adopt the C.G.S standard mix to prepare paste-slurry pumping bored material, every 1m
3Paste-slurry pumping bored material contains following composition:
| Cement | Aggregate (10mm is following) | Clay (4mm is following) | Water |
| 280kg | 0.5m 3 | 0.5m 3 | 0.2m 3 |
As shown in Figure 1, the main technology of this worker's method is:
First step is the immersed tube step, is the ground processing degree of depth of 80 millimeters, one meter one steel pipe 2 insertion construction requirements with rig 1 with external diameter, is connected by seal nipple between every steel pipe, shown in (a) among Fig. 1 (seal nipple not shown in the figures).
Second step, for the jack up unit step is installed, on exposed steel pipe 2 on the ground jack up unit being installed is hydraulic jack 3, shown in (b) among Fig. 1, simultaneously, adopting mixing plant is the paste-slurry pumping bored material of 0cm-5cm with coarse aggregate below the 10mm and the on-the-spot preparation of clay, cement and water structure slump value.
Third step is the slip casting step, and the outlet of high head injection pump is connected by pipeline 4 and the upper port of inserting underground steel pipe 2, is input to paste-slurry pumping bored material underground by high head injection pump.Pressure (40kg/cm in accordance with regulations
2-70kg/cm
2) and injection rate (present embodiment is to construct in silt, and the injection rate of high head injection pump is 1.0～4.0ft
3/ min) carry.When paste-slurry pumping bored material reaches certain pressure (70kg/cm
2) and injection rate (injection rate is 1.0ft
3/ min) after, suspend pumping, upwards extract steel pipe 30-50 millimeter with hydraulic jack 3 again, in first unit stake 5 of underground formation, shown in (c) among Fig. 1.
The 4th step is the pile step, continues pumping, when paste-slurry pumping bored material reaches certain pressure (70kg/cm
2) and injection rate (injection rate is 1.0ft
3/ min) after, suspend pumping, upwards extract steel pipe 30-50 millimeter with hydraulic jack 3 again, in second unit stake 6 of underground formation, shown in (d) among Fig. 1.Continue pumping, carry out repeatedly by the process that forms first unit stake 5, second unit stake 6, and finish one meter, pull down one meter steel pipe, one ends until the aperture, and a pile finishes.
Claims (6)
1, a kind of paste-slurry pumping bored process, it is characterized in that: this method comprises the steps:
First step inserts ascending pipe in the stratum of construction requirement with rig, and ascending pipe of every insertion, and connect a back ascending pipe again with seal nipple continues to insert a back ascending pipe, until be inserted into handle the degree of depth according to the ground of construction requirement till;
Second step stirs by mixing plant with cement, sand, clay and water, makes paste-slurry pumping bored material;
Third step connects the outlet of high head injection pump by the upper port of pipeline with last root ascending pipe that inserts ground;
The 4th step is transported to paste-slurry pumping bored material in the ascending pipe by high head injection pump, pipeline, and is input in the stratum by ascending pipe;
The 5th step after high head injection pump carries paste-slurry pumping bored material to surpass the pressure of setting, is suspended pumping, upwards extracts ascending pipe 30-50 millimeter, continues pumping again; After high head injection pump reaches the pressure of setting again, suspend pumping again, upwards extract ascending pipe 30-50 millimeter, continue pumping again, carry out repeatedly, and finish an ascending pipe, pull down an ascending pipe, one until pulling down all ascending pipes, and paste-slurry pumping bored material is filled with the aperture end, and a pile finishes.
2, paste-slurry pumping bored process according to claim 1 is characterized in that: the slump of made paste-slurry pumping bored material is 0cm-5cm in described second step.
3, paste-slurry pumping bored process according to claim 1 and 2 is characterized in that: in described the 4th step, high head injection pump is with 40kg/cm
2-70kg/cm
2Pressure be transported in the ascending pipe; In described the 5th step, the pressure of described setting is 70kg/cm
2
4, paste-slurry pumping bored process according to claim 3 is characterized in that: in described the 4th step, the 5th step, it is 0.5～12.0ft that high head injection pump is carried the injection rate of mortar pouring material
3/ min.
5, paste-slurry pumping bored process according to claim 4, it is characterized in that: in described the 4th step, the 5th step, it is to decide with different landform according to different soil properties that high head injection pump is carried the injection rate of mortar pouring material, and containing the mud of clay or the injection rate of loam soil property is 0.5～1.0ft
3/ min; The injection rate of sandy soil layer or powder soil horizon is 1.0～4.0ft
3/ min; The injection rate of loess is 4.0～12.0ft
3/ min.
6, paste-slurry pumping bored process according to claim 3 is characterized in that: in described first step, the ascending pipe that adopts is that internal diameter is
50-70mm, length is one meter steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101177215A CN101324065B (en) | 2008-08-04 | 2008-08-04 | Paste-slurry pumping bored pile technological process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101177215A CN101324065B (en) | 2008-08-04 | 2008-08-04 | Paste-slurry pumping bored pile technological process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101324065A true CN101324065A (en) | 2008-12-17 |
| CN101324065B CN101324065B (en) | 2012-01-18 |
Family
ID=40187755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101177215A Expired - Fee Related CN101324065B (en) | 2008-08-04 | 2008-08-04 | Paste-slurry pumping bored pile technological process |
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|---|---|
| CN (1) | CN101324065B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002901A (en) * | 2015-08-09 | 2015-10-28 | 张璐 | Use of pile-forming machine for dual-round-head piles |
-
2008
- 2008-08-04 CN CN2008101177215A patent/CN101324065B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002901A (en) * | 2015-08-09 | 2015-10-28 | 张璐 | Use of pile-forming machine for dual-round-head piles |
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| Publication number | Publication date |
|---|---|
| CN101324065B (en) | 2012-01-18 |
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Granted publication date: 20120118 Termination date: 20210804 |