CN108978654B - Integrated pile pier construction method - Google Patents
Integrated pile pier construction method Download PDFInfo
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- CN108978654B CN108978654B CN201810758402.6A CN201810758402A CN108978654B CN 108978654 B CN108978654 B CN 108978654B CN 201810758402 A CN201810758402 A CN 201810758402A CN 108978654 B CN108978654 B CN 108978654B
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- pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention relates to an integrated pile pier construction method. The concrete construction operation is as follows: are arranged in opposite directionsThe ultimate bearing capacity is measured as R, the effective wall thickness is measured as b, the specific gravity of the material is measured as gamma, and the total length is measured as LzTotal weight of GzThe depth of the prefabricated integrated pile pier to be driven into the ground is LmWhen the foundation bearing layer with the horizontal resistance coefficient of m is selected, the weight G is selectedcThe diesel hammer and the corresponding pile driver set a proper hammering stroke H, continuously hammer the positioned integrated pile pier, and synchronously measure the hammering penetration until the final hammering penetration delta H is less than or equal to 4H (G)c/Gz)/[R/Gz+m×b(Lm/Lz)/γ‑1]And carrying out subsequent construction judgment. The invention provides a method for accurately and quantitatively driving integrated pile piers of a highway pile plate type roadbed based on the law of mechanical momentum and the law of energy conservation, solves the problems of disordered pile driving standards and uncertain pile bearing capacity of the traditional method, and promotes the application of prefabricated pipe piles in the industrial construction of highways.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to an integrated pile pier construction method.
Background
At present, the construction of less-soil, soilless, high-efficiency and low-price projects is implemented on a large-scale and serialized level by adopting a structured viewpoint and an industrialized mode, and the construction becomes the development direction of the construction of green roads in China. Wherein, the small and medium-sized structure light-weight complete technology is a key part for implementing green road construction and road industrial construction. Through many years of exploration, the technology is developed greatly and has good demonstration effect, but still has many defects: such as lack of theoretical breakthrough, inaccurate construction control, etc.
How to efficiently and reliably drive the industrial precast tubular pile into the pile is always the focus of domestic design and construction debate. The analysis of the existing piling mode has the following problems:
(1) the internal relation among all parameters in the piling is unknown, and the stipulation performability of the control value of the depth and the penetration of the hammered pile is poor.
(2) The phenomenon that hammering is difficult to stop occurs frequently, and pile bearing capacity is often difficult to determine.
The problems seriously restrict the application of the precast tubular pile in the industrial construction of the highway, and a breakthrough solution is urgently needed in the engineering construction.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an integrated pile pier construction method.
The purpose of the invention can be realized by the following technical scheme:
an integrated pile pier construction method comprises the following steps:
(1) selecting known driving parameters;
(2) calculating single hammering penetration control value delta h of integrated pile pier construction at different pier positionsk；
(3) Continuously hammering the integrated pile pier, and synchronously measuring the hammering penetration delta h of the pile pier;
(4) of integral piersPenetration delta h is less than or equal to delta h in single hammeringkAnd then, carrying out subsequent construction judgment.
In one embodiment of the invention, the integrated pile pier adopts a precast tubular pile.
In one embodiment of the invention, in step (1), the known driving parameters are selected to include a vertical design ultimate bearing capacity R of the integrated pier, in kN; effective wall thickness b in m; the specific gravity gamma of the material is kN/m3(ii) a Total length LzIn the unit of m; total weight GzIn Kn; depth L to be drivenmIn the unit of m; the horizontal resistance coefficient of a foundation bearing layer to be driven is m, and the unit is kN/m4(ii) a Weight G of diesel hammercIn kN; the stroke H is in m.
In one embodiment of the present invention, in step (2), the single-hammer penetration control value Δ hkCalculated according to the following formula:
Δhk＝4H(Gc/Gz)/[R/Gz+m×b(Lm/Lz)/γ-1]
in an embodiment of the present invention, in the step (4), the subsequent construction judgment is performed according to the following rules:
(1) when the elevation of the pile bottom does not reach the designed elevation, continuously driving the pile to a uniformly specified design standard, and finishing driving the pile;
(2) and when the elevation of the pile bottom reaches the designed elevation, the driving is finished.
In one embodiment of the invention, the one uniformly specified design criterion is Δ h ≦ Δ h10/10，Δh10The total penetration control value of the last 10 hammering times taken according to the relevant specifications can be a general index, for example, delta h is less than or equal to 2.5cm/10 because the value is very small.
In one embodiment of the invention, the construction method is used for construction of a pile-plate type roadbed of a highway.
The invention provides a method for accurately and quantitatively driving an integrated pile pier for a highway pile plate type roadbed based on the law of mechanical momentum theorem and energy conservation, and promotes the application of a precast tubular pile in the industrial construction of a highway.
Compared with the prior art, the invention provides an accurate calculation formula of the control value of the penetration of single hammering in the piling process, establishes the internal relation among all parameters in the piling process and improves the control level of the piling process and the bearing capacity of the piled pile. Meanwhile, the operation rule of the piling ending stage is provided, and the standard of piling is unified on the basis of ensuring the bearing capacity of the formed pile. The method for accurately and quantitatively driving the integrated pile pier of the highway pile-plate type roadbed provided by the invention effectively solves the problems of disordered operation standards in the early construction period, low pile driving efficiency, large elevation difference of pile-forming pile tops and uncertain pile bearing capacity.
Drawings
FIG. 1 is a schematic diagram of a pile-slab roadbed;
fig. 2 is a schematic diagram of the construction of the integrated pier.
In the figure: 1, integrating pile piers; 2, a supporting layer; 3, a diesel hammer; 4, a pile driver; 5, integrating the cross section of the pile pier; h, hammering stroke; b, effective wall thickness of the integrated pile pier; the penetration degree of the integrated pile pier is hammered once; l ismThe depth to be driven; l iszLength of the integrated pier.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1: the construction of the integrated pile pier 1 adopts a diesel oil hammering driving mode.
In order to meet the development requirements of the industrialized construction of highways on standardization, systematization, modularization and assembly, a novel assembled pile-plate type roadbed is designed and provided. Referring to fig. 1, the lower structure of the roadbed is an integrated pile pier 1, and a prefabricated pipe pile with the outer diameter of 0.6m and the inner diameter of 0.38m is adopted. .
Referring to fig. 2, the integrated pier 1 has a vertical design ultimate bearing capacity R of 2750kN, an effective wall thickness b of 0.11m, and a material specific gravity γ of 26kN/m3Total length LzTotal weight G25 mz110kN, depth L to be drivenm20m, the horizontal resistance coefficient m of the foundation bearing layer 2 at different pile positions is 20000E C80000kN/m4。
According to the principle of short-time impact of heavy hammer, the weight G of diesel hammer 3 is selected for constructionc105kN, stroke H1.5 m.
Referring to fig. 2, the single-hammering penetration control value delta h of the integrated pile pier construction at different pier positions is combined with the geological conditions of the proven bearing stratum 2kAccording to the formula Δ hk＝4H(Gc/Gz)/[R/Gz+m×b(Lm/Lz)/γ-1]The calculation is as follows:
hard plastic clay, medium density silt and fine medium sand, wherein m is 20000kN/m4，Δhk＝0.0625m；
Hard clay, dense silt and medium coarse sand, wherein m is 40000kN/m4，Δhk＝0.0359m；
Gravel sand, cobble, round cobble and broken stone pebble, m is 60000kN/m4，Δhk＝0.0252m；
The dense pebbles are filled with coarse sand and dense pebbles, and m is 80000kN/m4，Δhk＝0.0194m。
Referring to fig. 2, the construction continuously hammers the positioned integrated pile pier 1, and the hammering penetration of the pile pier is synchronously measured until the single hammering penetration delta h of the pile pier at different pier positions meets the requirement that the corresponding delta h is not more than delta hkThe requirements are judged according to the following rules:
(1) when the elevation of the pile bottom does not reach the designed elevation, continuously driving until the delta h is less than or equal to the design standard of 2.5cm/10 strokes, and finishing driving;
(2) and when the elevation of the pile bottom reaches the designed elevation, the driving is finished.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (5)
1. The integrated pile pier construction method is characterized in that a prefabricated pipe pile is adopted as the integrated pile pier, and the integrated pile pier construction method is characterized in that when the prefabricated pipe pile is hammered by diesel oil, a penetration control value delta h is accurately calculated according to known driving parameterskAnd performing driving dynamic control, wherein the integrated pile pier construction method comprises the following steps:
(1) selecting known driving parameters;
(2) calculating single hammering penetration control value delta h of integrated pile pier construction at different pier positionsk；
(3) Continuously hammering the integrated pile pier, and synchronously measuring the hammering penetration delta h of the pile pier;
(4) the single-hammering penetration degree delta h of the integrated pile pier is less than or equal to delta hkThen, carrying out subsequent construction judgment;
in the step (1), the known driving parameters are selected to include the vertical design ultimate bearing capacity R of the integrated pile pier, and the unit is kN; effective wall thickness b in m; the specific gravity gamma of the material is kN/m3(ii) a Total length LzIn the unit of m; total weight GzIn kN; depth L to be drivenmIn the unit of m; the horizontal resistance coefficient of a foundation bearing layer to be driven is m, and the unit is kN/m4(ii) a Weight G of diesel hammercIn kN; run H, in m;
in the step (2), the single hammering penetration control value delta hkCalculated according to the following formula:
Δhk＝4H(Gc/Gz)/[R/Gz+m×b(Lm/Lz)/γ-1]。
2. the integrated pile pier construction method according to claim 1, wherein in the step (4), the follow-up construction judgment is carried out according to the following rules:
(1) when the elevation of the pile bottom does not reach the designed elevation, continuously driving the pile to a uniformly specified design standard, and finishing driving the pile;
(2) and when the elevation of the pile bottom reaches the designed elevation, the driving is finished.
3. The method of claim 2, wherein the design criteria is Δ h ≦ Δ h10/10，Δh10The value was controlled for total penetration for the last 10 blows taken.
4. The method of claim 3, wherein the one design criterion is Δ h ≦ 2.5 cm/10.
5. The integrated pile pier construction method according to any one of claims 1 to 4, wherein the construction method is used for construction of a highway pile-slab roadbed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810758402.6A CN108978654B (en) | 2018-07-11 | 2018-07-11 | Integrated pile pier construction method |
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| CN201810758402.6A CN108978654B (en) | 2018-07-11 | 2018-07-11 | Integrated pile pier construction method |
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| CN108978654A CN108978654A (en) | 2018-12-11 |
| CN108978654B true CN108978654B (en) | 2020-04-03 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005264505A (en) * | 2004-03-17 | 2005-09-29 | Taisei Corp | Construction management method for pile driving |
| CN104563171A (en) * | 2015-01-21 | 2015-04-29 | 中交四航局第二工程有限公司 | Device and method for detecting penetration of hammering piling for steel pipe pile |
| CN107587508A (en) * | 2017-10-23 | 2018-01-16 | 中国电建集团河南工程公司 | PHC pile tubes hammer construction method |
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2018
- 2018-07-11 CN CN201810758402.6A patent/CN108978654B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005264505A (en) * | 2004-03-17 | 2005-09-29 | Taisei Corp | Construction management method for pile driving |
| CN104563171A (en) * | 2015-01-21 | 2015-04-29 | 中交四航局第二工程有限公司 | Device and method for detecting penetration of hammering piling for steel pipe pile |
| CN107587508A (en) * | 2017-10-23 | 2018-01-16 | 中国电建集团河南工程公司 | PHC pile tubes hammer construction method |
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| CN108978654A (en) | 2018-12-11 |
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