CN115538500A - Pile body concrete quality defect detection method - Google Patents
Pile body concrete quality defect detection method Download PDFInfo
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- CN115538500A CN115538500A CN202211245141.0A CN202211245141A CN115538500A CN 115538500 A CN115538500 A CN 115538500A CN 202211245141 A CN202211245141 A CN 202211245141A CN 115538500 A CN115538500 A CN 115538500A
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- 238000001514 detection method Methods 0.000 title claims abstract description 124
- 230000007547 defect Effects 0.000 title claims abstract description 27
- 230000005284 excitation Effects 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 description 24
- 238000012360 testing method Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005553 drilling Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- Life Sciences & Earth Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a pile body concrete quality defect detection method, which comprises the following steps: forming a detection hole in the pile to be detected, wherein the detection hole extends along the length direction of the pile to be detected; placing a detection device in the detection hole; knocking the pile to be measured to generate an excitation wave; and detecting the excitation wave using the detection device; and analyzing the integrity of the pile body of the pile to be detected based on the detection result of the detection device. According to the pile body concrete quality defect detection method, the detection hole is formed in the pile to be detected, so that the influence of external factors such as a soil layer can be avoided, and the accuracy of a detection result is ensured.
Description
Technical Field
The invention relates to the technical field of technical detection, in particular to a pile body concrete quality defect detection method.
Background
The pile foundation is used as an important bearing and force transmission structure of an important building structure, and the construction quality of the pile foundation is related to the stability, the safety and the service life of a building superstructure. The construction quality detection of the pile foundation is crucial, and the conventional detection methods mainly comprise a low-strain method, an acoustic transmission method and a static load test method, wherein the low-strain method has many ideal assumptions in the test analysis process, so that the test curve has multiple resolvability. The low strain method also cannot effectively detect vertical cracks parallel to the axis of the pile body and micro cracks vertical to the axis of the pile body. The sound wave transmission method has a certain detection blind area problem, and defects outside a detection wave line and a sound field cannot be judged. The acoustic transmission method cannot effectively detect the microcracks vertical to the axis of the pile body. The static load test method only evaluates the bearing capacity of the pile foundation, and the detection result cannot reflect the pouring construction quality of the pile foundation. Compared with the conventional method, the parallel seismic wave method (or the side-hole transmission wave method) can effectively detect the integrity of the pile foundation, the testing principle is that holes are drilled in a soil layer within a certain range (such as 1 m) away from the pile, the hole depth exceeds the pile body, stress waves are generated by knocking the top of the pile, hydrophones in the drilled holes collect the transmitted stress waves, the transmitted wave velocity can be known according to the arrival time of the stress waves, and if the wave velocity changes, the length of the pile body or the defects (the wave velocity is influenced by media) can be judged. However, in practical use of the parallel seismic wave method, a weak interlayer, a soil cave, a karst cave, cracks, an inclined rock and other unfavorable geology exist in a soil layer between a drill hole and a pile, so that the accuracy of pile body quality judgment is influenced.
Disclosure of Invention
In order to achieve the above objects and other related objects, the present invention provides a method for detecting quality defects of pile concrete, comprising the steps of:
forming a detection hole in the pile to be detected, wherein the detection hole extends along the length direction of the pile to be detected;
placing a detection device in the detection hole;
knocking the pile to be tested to generate an excitation wave; and detecting the excitation wave using the detection device;
and analyzing the integrity of the pile body of the pile to be detected based on the detection result of the detection device.
Optionally, the depth of the detection hole is greater than or equal to the length of the pile to be detected.
Optionally, the central line of the detection hole coincides with the central line of the pile to be measured.
Optionally, the centerline of the probing hole is offset from the centerline of the pile under test.
Optionally, the detection device includes a string sensor, and the string sensor includes a plurality of string hydrophones arranged at intervals along the depth direction of the detection hole.
Optionally, knocking the pile to be tested to generate an excitation wave; and detecting the excitation wave using the detecting means includes:
selecting a knocking point on the pile to be tested;
knocking the knocking point and detecting by using the detecting device.
Optionally, the number of the selected knocking points on the pile to be detected is multiple, and the knocking points are arranged at intervals along the circumferential direction of the detection hole and have a distance from the detection hole; the length of the string sensor is smaller than the depth of the detection hole; before each knocking point is knocked, the detection devices are all arranged at the bottoms of the detection holes; knocking the knocking point and detecting by using the detecting device comprises the following steps:
knocking one knocking point and detecting by using the detection device;
lifting the height of the detection device, knocking the same knocking point, and detecting by using the detection device;
repeating the previous step until the detection device is lifted out of the detection hole;
and repeating the steps until all the knocking points are knocked and detected.
As described above, the pile body concrete quality defect detection method of the present invention has the following beneficial effects: according to the pile body concrete quality defect detection method, the detection hole is formed in the pile to be detected, so that the influence of external factors such as a soil layer can be avoided, and the accuracy of a detection result is ensured.
Drawings
Fig. 1 is a schematic view of a cross-sectional structure of a pile to be detected in a pile body concrete quality defect detection method.
Fig. 2 is a flow chart of the pile body concrete quality defect detection method of the invention.
Fig. 3 is a schematic top view of a pile to be tested having a detection hole according to the method for detecting quality defects of pile body concrete of the present invention.
Fig. 4 is a schematic cross-sectional structure diagram of a pile to be detected in the pile body concrete quality defect detection method of the present invention.
Element number description:
11. a pile to be measured 12, a detection hole 13, a string type sensor 14 and soil; 21. the method comprises the steps of a pile to be measured 22, a detection hole 23, a knocking point 24, a string type sensor 25 and soil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
The parallel seismic method is a mature existing basic detection method at present. The method is a geophysical prospecting method for detecting and inspecting the building foundation and the foundation pile by exciting elastic waves on an existing building structure connected with a foundation to be detected and observing transmitted waves in a single side drill hole. When the detection hole is positioned on the pile side, the qualitative judgment of the existing foundation type by the parallel seismic wave method has high accuracy. When the existing foundation is the friction pile, the accuracy of measuring the depth of the foundation pile into the soil is high. When the pile body quality, the pile bottom and bearing stratum combination condition and the foundation pile type are measured, certain accuracy is achieved.
In general, as shown in fig. 1, a method for detecting the length and integrity of a pile foundation by a parallel seismic method is to drill a detection hole 12 in a soil layer within a certain range (for example, 1 m) from a pile 11 to be detected, where the pile 11 to be detected and the detection hole 12 are both located in soil 14, the hole depth of the detection hole 12 exceeds the length of the pile 11 to be detected, a stress wave is generated by knocking the top of the pile 11 to be detected, a string sensor 13 in the detection hole 12 collects the transmitted stress wave, the wave velocity transmitted by the stress wave can be known according to the arrival time of the stress wave, if the wave velocity changes, the length or the defect (the wave velocity is influenced by a medium) of the pile 11 to be detected can be determined, but in actual use, unfavorable geology such as soil cave, karst, fissure, inclined rock and the like exists in the soil layer between the detection hole 12 and the pile 11 to be detected, and thus the accuracy of the determination can be affected.
The testing and analyzing steps of the parallel seismic wave method comprise:
(1) drilling and pipe laying
Drilling a detection hole parallel to the central line of the pile foundation in the soil layer within a certain range (such as 1 m) around the pile foundation, wherein the drilling depth of the detection hole exceeds the designed pile length by at least 5 m; and after the drilling is finished, embedding a plastic inclinometer pipe in the hole, wherein the inclinometer pipe is arranged along the whole length of the drilling. And after the probe pipe is lowered down, sand is backfilled to enable the outer wall of the probe pipe to be tightly combined with the soil layer.
(2) In situ testing
During testing, the sensor is sunk to the bottom of the hole, a hammer is used for exciting vibration on the pile foundation or an existing building structure connected with a foundation to be tested, elastic waves transmitted along the longitudinal direction of the pile foundation are excited, and one seismic record is recorded during each excitation. The string sensor is lifted at a certain distance (e.g., 0.1 m) and tested point by point until the string sensor is lifted out of the orifice.
(3) Analysis of results
And extracting the field detection data of each hole into a seismic time section with a certain interval (such as 0.1 m), comprehensively analyzing the characteristics of the apparent velocity, frequency, amplitude and the like of the direct arrival wave of the elastic wave, and evaluating the integrity of the pile body of the foundation pile to be detected.
Example one
Referring to fig. 2, the present invention provides a method for detecting quality defects of pile concrete, comprising the following steps:
s1: forming a detection hole in the pile to be detected, wherein the detection hole extends along the length direction of the pile to be detected;
s2: placing a detection device in the detection hole;
s3: knocking the pile to be measured to generate an excitation wave; and detecting the excitation wave using the detection device;
s4: and analyzing the integrity of the pile body of the pile to be detected based on the detection result of the detection device.
According to the pile body concrete quality defect detection method, the detection hole is formed in the pile to be detected, so that the influence of external factors such as a soil layer can be avoided, and the accuracy of a detection result is ensured.
Example two
Referring to fig. 3 to 4 in conjunction with fig. 2, the present embodiment further provides a method for detecting a pile concrete quality defect, and the method for detecting a pile concrete quality defect in the present embodiment further includes the following contents in comparison with the method for detecting a pile concrete quality defect in the first embodiment.
As an example, the pile under test 21 is located in the soil 25.
As an example, the depth of the detection hole 22 may be greater than or equal to the length of the pile 21 to be measured, as shown in fig. 4.
Specifically, the depth of the detection hole 22 may be greater than the length of the pile 21 to be measured, or may be equal to the length of the pile 21 to be measured, preferably, in this embodiment, the depth of the detection hole 22 is greater than the length of the pile 21 to be measured. By setting the depth of the detection hole 22 to be greater than or equal to the length of the pile 21 to be detected, it is ensured that the detection device can completely detect the whole pile 21 to be detected.
In one example, the center line of the detection hole 22 may coincide with the center line of the pile 21 to be measured, as shown in fig. 3.
In another example, the center line of the detection hole 22 may be offset from the center line of the pile 21 to be measured.
As an example, the detection device may include a string sensor, and the string sensor may include a plurality of string sensors 24 spaced apart in a depth direction of the detection hole 22. The specific structure and operation of the string sensor 24 is known to those skilled in the art and will not be similar here.
As an example, step S3 knocks the pile under test 21 to generate an excitation wave; and detecting the excitation wave using the detecting means may include:
s31: selecting a knocking point 23 on the pile 21 to be tested;
s32: the tapping point 23 is tapped and detected using the detection means.
In one example, the number of the selected knocking points 23 on the pile 21 to be tested is multiple, and the knocking points 23 are arranged at intervals along the circumferential direction of the detection hole 22 and have a distance from the detection hole 22; the length of the string sensor is less than the depth of the detection bore 22; before each knocking point 23 is knocked, the detection device is arranged at the bottom of the detection hole 22; step S32 of knocking the knocking point 23 and detecting using the detecting means includes:
s321: knocking one knocking point 23 and detecting by using the detection device;
s322: lifting the height of the detection device, knocking the same knocking point 23, and detecting by using the detection device;
s323: repeating the previous step, namely step S322, until the detecting device is lifted out of the detecting hole 22;
s324: and repeating the steps, namely repeating the steps S321 to S323 until all the knocking points 23 are knocked and detected.
In another example, the number of the selected knocking points 23 on the pile 21 to be tested is multiple, and the knocking points 23 are arranged at intervals along the circumferential direction of the detection hole 22 and have a distance from the detection hole 22; the length of the string sensor is greater than or equal to the depth of the detection hole 22; knocking the knocking point 23 and detecting using the detecting means includes:
s321: knocking one knocking point 23 and detecting by using the detection device;
s322: knocking another knocking point 23 and detecting by using the detection device;
s323: and repeating the previous step, namely repeating the step S322, until all the tapping points 23 are tapped and detected.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A pile body concrete quality defect detection method is characterized by comprising the following steps:
forming a detection hole in the pile to be detected, wherein the detection hole extends along the length direction of the pile to be detected;
placing a detection device in the detection hole;
knocking the pile to be measured to generate an excitation wave; and detecting the excitation wave using the detection device;
and analyzing the integrity of the pile body of the pile to be detected based on the detection result of the detection device.
2. The pile body concrete quality defect detection method according to claim 1, characterized in that: the depth of the detection hole is larger than or equal to the length of the pile to be detected.
3. The pile body concrete quality defect detection method according to claim 1, characterized in that: the central line of the detection hole coincides with the central line of the pile to be detected.
4. The pile body concrete quality defect detection method according to claim 1, characterized in that: the central line of the detection hole deviates from the central line of the pile to be detected.
5. The pile body concrete quality defect detection method according to any one of claims 1 to 4, characterized in that: the detection device comprises a string type sensor, and the string type sensor comprises a plurality of string type hydrophones which are arranged at intervals along the depth direction of the detection hole.
6. The pile body concrete quality defect detection method according to claim 5, characterized in that: knocking the pile to be measured to generate an excitation wave; and detecting the excitation wave using the detection device includes:
selecting a knocking point on the pile to be tested;
knocking the knocking point and detecting by using the detecting device.
7. The pile body concrete quality defect detection method according to claim 6, characterized in that: the number of the selected knocking points on the pile to be detected is multiple, and the knocking points are distributed at intervals along the circumferential direction of the detection hole and have a distance with the detection hole; the length of the string sensor is smaller than the depth of the detection hole; before knocking each knocking point, the detection device is arranged at the bottom of the detection hole; knocking the knocking point and detecting by using the detecting device comprises the following steps:
knocking one knocking point and detecting by using the detection device;
lifting the height of the detection device, knocking the same knocking point, and detecting by using the detection device;
repeating the previous step until the detection device is lifted out of the detection hole;
and repeating the steps until all the knocking points are knocked and detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211245141.0A CN115538500A (en) | 2022-10-12 | 2022-10-12 | Pile body concrete quality defect detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211245141.0A CN115538500A (en) | 2022-10-12 | 2022-10-12 | Pile body concrete quality defect detection method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008185426A (en) * | 2007-01-29 | 2008-08-14 | Takenaka Komuten Co Ltd | Integrity evaluation support device, method, and program of concrete pile |
| CN103255785A (en) * | 2012-02-15 | 2013-08-21 | 陈彦平 | Technology for performing foundation pile quality detection and geology survey by adopting single tube longitudinal wave method |
| CN106836320A (en) * | 2017-03-20 | 2017-06-13 | 浙江大学 | Provided pipe bottom exciting side hole receives velocity of wave test pile bottom slip casting test apparatus and method |
| CN110173005A (en) * | 2019-05-15 | 2019-08-27 | 浙江大学 | The Kong Zhongshuan measuring point low strain integrity test device and method of foundation pile |
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2022
- 2022-10-12 CN CN202211245141.0A patent/CN115538500A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008185426A (en) * | 2007-01-29 | 2008-08-14 | Takenaka Komuten Co Ltd | Integrity evaluation support device, method, and program of concrete pile |
| CN103255785A (en) * | 2012-02-15 | 2013-08-21 | 陈彦平 | Technology for performing foundation pile quality detection and geology survey by adopting single tube longitudinal wave method |
| CN106836320A (en) * | 2017-03-20 | 2017-06-13 | 浙江大学 | Provided pipe bottom exciting side hole receives velocity of wave test pile bottom slip casting test apparatus and method |
| CN110173005A (en) * | 2019-05-15 | 2019-08-27 | 浙江大学 | The Kong Zhongshuan measuring point low strain integrity test device and method of foundation pile |
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