CN113089734A - Nondestructive testing method for pile length of vibroflotation gravel pile - Google Patents
Nondestructive testing method for pile length of vibroflotation gravel pile Download PDFInfo
- Publication number
- CN113089734A CN113089734A CN202110348736.8A CN202110348736A CN113089734A CN 113089734 A CN113089734 A CN 113089734A CN 202110348736 A CN202110348736 A CN 202110348736A CN 113089734 A CN113089734 A CN 113089734A
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- Prior art keywords
- pile
- vibroflotation
- vibroflotation gravel
- gravel pile
- length
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000009659 non-destructive testing Methods 0.000 title claims description 13
- 239000000945 filler Substances 0.000 claims abstract description 32
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 230000000149 penetrating effect Effects 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000004575 stone Substances 0.000 claims description 13
- 238000010923 batch production Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
Abstract
The invention relates to the field of a method for detecting a vibroflotation gravel pile of a water conservancy and hydropower facility, in particular to a nondestructive detection method for the length of the vibroflotation gravel pile, which can quickly and accurately realize the length detection of the vibroflotation gravel pile, and comprises the following steps: a. before the construction of the vibroflotation gravel pile to be detected, mixing a tracer into the pile body bottom filler, and gathering the mixture of the tracer and the pile body bottom filler to the bottom of the vibroflotation gravel pile; b. after the construction of the mixture filler at the bottom of the vibroflotation gravel pile is finished, the construction of the vibroflotation gravel pile is finished, namely the construction of the common filler is finished; c. after the construction of the common filler of the whole vibroflotation gravel pile is completed, detecting the tracer at the bottom of the vibroflotation gravel pile by using a ground penetrating radar, and obtaining the pile length of the vibroflotation gravel pile. The method has the advantages of clear and obvious reflected wave signals at the lower pile bottom of the vibro-replacement gravel pile, effective determination of the pile length of the vibro-replacement gravel pile, simple and convenient operation and implementation, no influence on the field construction progress, low cost and wide application in engineering practice.
Description
Technical Field
The invention relates to the field of a method for detecting a vibroflotation gravel pile of a water conservancy and hydropower facility, in particular to a nondestructive detection method for the length of the vibroflotation gravel pile.
Background
With the adjustment of national energy structures, the development of hydropower comes along with new development opportunities, especially in the deep mountain valley in the southwest region. However, due to the restriction of environmental conditions, the power station is mostly built on a deep covering layer, and the traditional excavation means has poor economy of foundation treatment, so that the foundation is mostly reinforced by vibro-replacement gravel piles. The quality detection of the vibroflotation gravel pile is the key for evaluating the foundation treatment effect and mainly comprises the bearing characteristic, the pile length and the like. The detection method of the vibroflotation gravel pile mainly comprises a bearing characteristic detection method such as an inter-pile soil penetration test, a single-pile static load test and a composite foundation load test, and the key indexes such as pile length and the like cannot be quickly and effectively detected except excavation at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a nondestructive testing method for the pile length of a vibroflotation gravel pile, which can quickly and accurately realize the pile length testing of the vibroflotation gravel pile.
The technical scheme adopted by the invention for solving the technical problems is as follows: the nondestructive testing method for the pile length of the vibroflotation gravel pile comprises the following steps: a. before the construction of the vibroflotation gravel pile to be detected, mixing a tracer into the pile body bottom filler, and gathering the mixture of the tracer and the pile body bottom filler to the bottom of the vibroflotation gravel pile; b. after the construction of the mixture filler at the bottom of the vibroflotation gravel pile is finished, the construction of the vibroflotation gravel pile is finished, namely the construction of the common filler is finished; c. after the construction of the common filler of the whole vibroflotation gravel pile is completed, detecting the tracer at the bottom of the vibroflotation gravel pile by using a ground penetrating radar, and obtaining the pile length of the vibroflotation gravel pile.
Further, in the step a, the tracer is gathered at the bottom of the vibroflotation gravel pile through vibroflotation.
Further, in the step a, the pile body bottom filler is gathered at the bottom of the vibroflotation gravel pile through vibroflotation.
Further, in the step a, the vibro-replacement stone column is arranged along the vertical direction.
Further, in step c, a ground penetrating radar is arranged on the top surface of the vibroflotation gravel pile.
Further, the ground penetrating radar is a vehicle-mounted ground penetrating radar.
Further, in the step a, the tracer and the pile body bottom filler are uniformly mixed in a mixing mode, namely a stirring method.
Further, the mixing method is to complete batch production by mixing and mixing through a mixing station.
The invention has the beneficial effects that: when the method is actually used, the tracer and the filler at the bottom of the vibroflotation gravel pile are mixed to form a whole, the mixture reaches the bottom of the gravel pile, and then the reflection distance of the tracer is determined through geological radar detection, namely the pile length of the vibroflotation gravel pile is accurately judged through the reflection distance. Due to the innovation of the detection method, the lower pile bottom reflected wave signal of the vibroflotation gravel pile is clear and obvious, the pile length of the vibroflotation gravel pile can be effectively determined, meanwhile, the operation and implementation are simple and convenient, the field construction progress is not influenced, the method is low in cost, and the method can be widely applied to engineering practice.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Labeled as: the method comprises the following steps of tracer 1, pile body bottom filler 2, ground penetrating radar 3, reflected wave 4, vibroflotation gravel pile 5 and pile body common filler 6.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The nondestructive testing method for the pile length of the vibro-replacement gravel pile shown in fig. 1 comprises the following steps: a. before the construction of a vibroflotation gravel pile 5 to be detected, mixing a tracer 1 into a pile body bottom filler 2, and gathering a mixture of the tracer 1 and the pile body bottom filler 2 to the bottom of the vibroflotation gravel pile 5; b. after the construction of the mixture filler at the bottom of the vibroflotation gravel pile 5 is finished, the construction of the vibroflotation gravel pile 5 is finished, namely the construction of the common filler 6 of the pile body is finished; c. after the construction of the common pile body filler 6 of the whole vibroflotation gravel pile 5 is completed, the ground penetrating radar 3 is adopted to detect the tracer 1 at the bottom of the vibroflotation gravel pile 5, and the pile length of the vibroflotation gravel pile 5 is obtained.
The invention effectively avoids the problems caused by excavation of the vibroflotation gravel pile in the existing detection mode, and solves the problems of complex pile length detection, low efficiency and high cost in the prior art. Because the electrical property of the tracer 1 is greatly different from that of the common pile filler 6, the ground penetrating radar 3 can quickly analyze the reflected signal after the tracer and the pile filler are uniformly mixed. The invention fully utilizes the characteristic that the tracer 1 has strong reflectivity to the wave of the ground penetrating radar, generates strong reflected wave by the tracer 1 gathered at the pile bottom and displays the strong reflected wave on the monitoring screen of the ground penetrating radar 3, thereby determining the pile bottom position of the vibroflotation pile and further judging the effective pile length of the vibroflotation pile. Preferably, a tracer material with larger particles is adopted, so that the occlusion effect of the filler is enhanced, and the influence on the accuracy of pile length detection caused by extrusion in the vibroflotation process is avoided.
In particular operation, in order to better ensure that the tracer 1 collects at the bottom of the vibro-replacement stone column 5, it is preferred that in step a, the tracer 1 is collected at the bottom of the vibro-replacement stone column 5 by vibro-replacement. Based on the same concept, in the step a, the pile body bottom filling material 2 is preferably gathered at the bottom of the vibro-replacement stone pile 5 through vibro-replacement.
In combination with practice, in order to ensure that the tracer 1 is better gathered at the bottom of the vibro-replacement stone pillar 5, it is preferable that in step a, the vibro-replacement stone pillar 5 is arranged along the vertical direction, on the premise of ensuring design requirements. In addition, in the preferable step c, the ground penetrating radar 3 is arranged on the top surface of the vibroflotation gravel pile 5, so that the detection can be completed more accurately and more conveniently.
In order to facilitate the rapid conversion of the construction surface and perform rapid analysis and judgment on the signals reflected by the tracers, the ground penetrating radar 3 is preferably a vehicle-mounted ground penetrating radar capable of moving rapidly. In order to ensure that the tracer and the pile body filler are uniformly mixed, preferably, in the step a, the uniform mixing mode between the tracer 1 and the pile body bottom filler 2 is a mixing method. In order to achieve mixing in large batches, it is preferred that the mixing process be mass produced by a mixing station.
Claims (8)
1. The nondestructive testing method for the pile length of the vibroflotation gravel pile is characterized by comprising the following steps:
a. before the construction of a vibroflotation gravel pile (5) to be detected, mixing a tracer (1) into a pile body bottom filler (2), and gathering a mixture of the tracer (1) and the pile body bottom filler (2) to the bottom of the vibroflotation gravel pile (5);
b. after the construction of the mixture filler at the bottom of the vibroflotation gravel pile (5) is finished, the construction of the vibroflotation gravel pile (5) is finished, namely the construction of the common filler (6) of the pile body is finished;
c. after the construction of the common filler (6) of the whole vibroflotation gravel pile (5) is completed, the ground penetrating radar (3) is adopted to detect the tracer (1) at the bottom of the vibroflotation gravel pile (5) and obtain the pile length of the vibroflotation gravel pile (5).
2. The nondestructive testing method for the pile length of a vibro-replacement stone pile as claimed in claim 1, characterized in that: in the step a, the tracer (1) is gathered at the bottom of the vibroflotation gravel pile (5) through vibroflotation.
3. A nondestructive testing method for the pile length of a vibro-replacement stone pile as claimed in claim 1 or 2, characterized in that: in the step a, the pile body bottom filler (2) is gathered at the bottom of the vibroflotation gravel pile (5) through vibroflotation.
4. A nondestructive testing method for the pile length of a vibro-replacement stone pile as claimed in claim 1 or 2, characterized in that: in the step a, the vibro-replacement gravel pile (5) is arranged along the vertical direction.
5. A nondestructive testing method for the pile length of a vibro-replacement stone pile as claimed in claim 1 or 2, characterized in that: in the step c, the ground penetrating radar (3) is arranged on the top surface of the vibroflotation gravel pile (5).
6. The nondestructive testing method for the pile length of a vibro-replacement stone pile as set forth in claim 5, characterized in that: the ground penetrating radar (3) is a vehicle-mounted ground penetrating radar.
7. A nondestructive testing method for the pile length of a vibro-replacement stone pile as claimed in claim 1 or 2, characterized in that: in the step a, a mixing mode for uniformly mixing the tracer (1) and the pile body bottom filler (2) is a stirring method.
8. The nondestructive testing method for the pile length of a vibro-replacement stone pile as set forth in claim 7, characterized in that: the mixing method is batch production through a mixing station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110348736.8A CN113089734A (en) | 2021-03-31 | 2021-03-31 | Nondestructive testing method for pile length of vibroflotation gravel pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110348736.8A CN113089734A (en) | 2021-03-31 | 2021-03-31 | Nondestructive testing method for pile length of vibroflotation gravel pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113089734A true CN113089734A (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110348736.8A Pending CN113089734A (en) | 2021-03-31 | 2021-03-31 | Nondestructive testing method for pile length of vibroflotation gravel pile |
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| CN (1) | CN113089734A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277768A (en) * | 2022-01-27 | 2022-04-05 | 北京宏创天业建设工程有限公司 | Method for excavating cross section of vibroflotation gravel pile body |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563975A (en) * | 2014-12-24 | 2015-04-29 | 中国石油天然气股份有限公司 | Gravel packing effect detecting method and detecting device by adopting isotopic tracing |
| CN107806013A (en) * | 2017-11-03 | 2018-03-16 | 山东交通学院 | A kind of bridge deck water-proof gluing layer and application for radar measuring pave-load layer thickness |
-
2021
- 2021-03-31 CN CN202110348736.8A patent/CN113089734A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563975A (en) * | 2014-12-24 | 2015-04-29 | 中国石油天然气股份有限公司 | Gravel packing effect detecting method and detecting device by adopting isotopic tracing |
| CN107806013A (en) * | 2017-11-03 | 2018-03-16 | 山东交通学院 | A kind of bridge deck water-proof gluing layer and application for radar measuring pave-load layer thickness |
Non-Patent Citations (1)
| Title |
|---|
| 孙宝等: "探地雷达在碎石桩检测中的应用", 《河北农业大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277768A (en) * | 2022-01-27 | 2022-04-05 | 北京宏创天业建设工程有限公司 | Method for excavating cross section of vibroflotation gravel pile body |
| CN114277768B (en) * | 2022-01-27 | 2023-04-18 | 北京宏创天业建设工程有限公司 | Method for excavating vertical section of vibroflotation gravel pile body |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20210709 |