CN103821184A - Stress wave multi-point excitation method and multi-point excitation device for detecting quality of foundation piles - Google Patents
Stress wave multi-point excitation method and multi-point excitation device for detecting quality of foundation piles Download PDFInfo
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- CN103821184A CN103821184A CN201410039852.1A CN201410039852A CN103821184A CN 103821184 A CN103821184 A CN 103821184A CN 201410039852 A CN201410039852 A CN 201410039852A CN 103821184 A CN103821184 A CN 103821184A
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Abstract
The invention discloses a stress wave multi-point excitation method for detecting the quality of foundation piles and a multi-point excitation device for implementing the stress wave multi-point excitation method. The stress wave multi-point excitation method is characterized in that two or more points on a pile top are synchronously excited, so that two or more rows of synchronous excitation stress waves can be generated and instantaneously interfere with one another in a pile body; energy of the waves is proportional to a square function of the amplitude of the waves, so that energy of vibration enhancement regions of the interference stress waves can be increased, the method is favorable for propagating the interference stress waves to deep portions of a pile, detected reflected wave signals are strengthened as compared with single-point excitation reflected signals, and information of the quality of the pile body can be effectively reflected. The stress wave multi-point excitation method and the multi-point excitation device have the advantages that the waves can be effectively propagated by far distances in propagation procedures, the direction propagation ability is high as compared with common stress waves, abnormal information of the deep portions of the pile can be effectively reflected by the stress wave multi-point excitation method and the multi-point excitation device, and the detection efficiency can be guaranteed.
Description
Technical field
The invention belongs to Test Technology of Pile Foundation field, particularly a kind of stress wave multi-point exciting method that detects pile quality, also relates to the multi-point exciting device that uses the method.
Background technology
At present, low Strain Method and high Strain Method to the Stress Wave Method of pile integrity detection, wherein most widely used with low Strain Method, what low Strain Method was the most frequently used is to adopt low-yield transient state at stake top exciting, obtain the speed time-history curves at a top by detecting instrument, speed time-history curves is carried out to wave theory analysis, on speed time-history curves, obtain the position of abnormity point, pile body integrity is judged.Above-mentioned testing process all has regulation in industry standard " architecture foundation pile inspection specifications ", " building foundation detection standard ".
While using low Strain Method, need to be at some excitings of stake top hand hammer, some excitings of hand hammer are easy to detect quick as the advantage of traditional excitation method, still, its shortcoming is that the effective propagation path of hammer vibration energy is shorter, is difficult to the long stake of effecting reaction deep abnormal information.If adopt weight exciting to detect pile body integrity, although effecting reaction stake Deep Information more, but can reduce detection efficiency, inadaptable a large amount of heavy Detection tasks need.
Summary of the invention
First object of the present invention is to provide a kind of not only can react a deep abnormal information effectively, but also can guarantee the stress wave multi-point exciting method of the detection pile quality of detection efficiency.
Second object of the present invention is to provide a kind of multi-point exciting device of the stress wave multi-point exciting method that uses above-mentioned detection pile quality.
First object of the present invention realizes by following technical measures: a kind of stress wave multi-point exciting method that detects pile quality, it is characterized in that adopting two or more synchronous exciters on stake top, produce the above synchronous exciter stress wave of two row or two row transient state interference in pile body, because energy and the Amplitude-squared of ripple are directly proportional, the energy of the vibration reinforced region of the interference stresses ripple after interfering is strengthened, be beneficial to interference stresses ripple and be transmitted to a deep, so that the reflection wave signal detecting strengthens compared with the reflection wave signal of single point excitation, can more effectively reflect pile quality information.
The present invention adopts two or more synchronous exciters on stake top, the feature that the region energy that utilizes the interference wave vibration of two row or multiple row stress wave to strengthen is directly proportional to Amplitude-squared, interfere the energy of the ripple of after vibration reinforced region to be far longer than single-row wave energy, make interference stresses ripple signal compared with single point excitation stress wave, in communication process, can there is effect spread to obtain farther, there is the direction propagation ability that more common stress wave is stronger, compared with existing stress wave, the present invention can react a deep abnormal information better, and can guarantee detection efficiency.
The principle that the present invention adopts is: two row or the poor constant ripple of multiple row frequency same phase can interfere phenomenon in communication process, and the vibration in some region is strengthened, and the region energy that vibration is strengthened is directly proportional to Amplitude-squared; The vibration weakening in some region, and vibration strengthen region and the region of vibration weakening be spaced from each other.
Described synchronous exciter stress wave is the stress wave of the identical and constant phase difference of frequency; The present invention produces transient signal at stake top exciting, and utilizes transient state interference effect.
Second object of the present invention realizes by following technical measures: a kind of multi-point exciting device of the stress wave multi-point exciting method that uses above-mentioned detection pile quality, it is characterized in that: it comprises two or more impulse members, link and the support pushing up for being supported on stake, each impulse member is connected on link, and the bottom of impulse member has jump bit, described each impulse member is regular distribution on link, described link is arranged on the top of described support, described jump bit extends on stake top through described support, so that link under external force, drive each impulse member to move downward jump bit is impacted on stake top simultaneously, realize synchronous exciter.
The present invention can make the jump bit of each impulse member impact on stake top simultaneously, thereby realizes synchronous exciter; In addition, of the present invention simple in structure, be convenient for carrying, and easy to use.
As another embodiment of the invention, between described link and described support, be provided with vertical spring, described link is connected on described support by spring, and link is applied to active force upwards, relies on the restoring force of spring to drive each impulse member and jump bit to move downward.
As a kind of optimal way of the present invention, described link and each impulse member adopt same material to make, described each impulse member is on same circumference, it is the distribution that is centrosymmetric of described each impulse member, correspondingly, described link is made up of several connecting rods, and impulse member is arranged on one end of connecting rod, the other end of connecting rod collects and connects as central point, and this central point is the point of application of External Force Acting.
As one embodiment of the present invention, described support is made up of vertical pillar and the level board that is fixed on pillar upper end, and the position corresponding to impulse member on described level board has pilot hole, and described impulse member is passed down through pilot hole and stretches out.
As a modification of the present invention, between described impulse member and described link, be provided with the lifting regulating mechanism for regulating jump bit upper-lower position.
As one embodiment of the present invention, described lifting regulating mechanism comprises adjustment member and adjustment hole, described adjustment hole is arranged on described link and impulse member, wherein, the adjustment hole being positioned on impulse member is provided with several along the length direction of impulse member, adjustment member makes the height of jump bit adjustable through fixing in the different adjustment hole of the adjustment hole on link and impulse member, so that two or more jump bit can contact the different position of the corresponding depth of an end face simultaneously.
As a further improvement on the present invention, between described impulse member and described link, be provided with the lateral displacement governor motion for regulating impulse member position on link.
As one embodiment of the present invention, described lateral displacement mechanism comprises adjustment member and adjustment hole, described adjustment hole is arranged on described link and impulse member, wherein, the adjustment hole being positioned on link is provided with several along the length direction of connecting rod, adjustment member makes the position of jump bit on link adjustable through fixing in the different adjustment hole of the adjustment hole on impulse member and link, so that different jump bits can contact the upper corresponding shock point in stake top simultaneously.
Compared with prior art, the present invention has following significant effect:
The present invention adopts two or more synchronous exciters on stake top, the feature that the region energy that utilizes the interference wave vibration of two row or multiple row stress wave to strengthen is directly proportional to Amplitude-squared, interfere the energy of the ripple of after vibration reinforced region to be far longer than single-row wave energy, make interference stresses ripple signal compared with single point excitation stress wave, in communication process, can there is effect spread to obtain farther, there is the direction propagation ability that more common stress wave is stronger, compared with existing stress wave, the present invention can react a deep abnormal information better, and can guarantee detection efficiency.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the structural representation of checkout gear of the present invention.
The specific embodiment
Embodiment 1
A kind of stress wave multi-point exciting method that detects pile quality of the present invention, adopt two or more synchronous exciters on stake top, produce the above synchronous exciter stress wave of two row or two row transient state interference in pile body, because energy and the Amplitude-squared of ripple are directly proportional, the energy of the vibration reinforced region of the interference stresses ripple after interfering is strengthened, be beneficial to interference stresses ripple and be transmitted to a deep, so that the reflection wave signal detecting strengthens compared with the reflection wave signal of single point excitation, can more effectively reflect pile quality information.
As shown in Figure 1, a kind of multi-point exciting device of the stress wave multi-point exciting method that uses above-mentioned detection pile quality, it comprises two impulse members 1, link 2 and the support 3 pushing up for being supported on stake, link adopts the material of stronger rigidity to make, each impulse member 1 is vertically connected on link 2, and the bottom of impulse member 1 has jump bit 6, link 2 is positioned at the top on support 3, each impulse member 1 is regular distribution on link 2, so that link 2 under external force, drive each impulse member 1 to move downward jump bit 6 is impacted on stake top 4 simultaneously, realize synchronous exciter.
In the present embodiment, link 2 and each impulse member 1 adopt same material to make, link 2 is a connecting rod, two impulse members 1 are symmetric with the centre of connecting rod, between link 2 and support 3, be provided with vertical spring 5, link 2 is fixed on support 3 by spring 5, spring 5 is connected to the centre of connecting rod, support 3 is made up of vertical pillar 31 and the level board 32 that is fixed on pillar 31 upper ends, position corresponding to impulse member on level board 32 has pilot hole, and impulse member is passed down through pilot hole and stretches out.Link applies active force upwards, relies on the restoring force of spring to drive each impulse member to move downward jump bit 6 is impacted on stake top.
Between impulse member and link, be provided with the lifting regulating mechanism (not shown in FIG.) for regulating jump bit 6 upper-lower positions.Lifting regulating mechanism comprises adjustment member and adjustment hole, adjustment member is screw, adjustment hole is screw, adjustment hole is arranged on link and impulse member, wherein, be positioned at adjustment hole on impulse member and be provided with severally along the length direction of impulse member, adjustment member is through fixing in the different adjustment hole of the adjustment hole on link and impulse member and make the height of jump bit 6 adjustable, so that the jump bit 6 upper corresponding different positions of the depth, contact stake top.
Between impulse member and link, be provided with the lateral displacement governor motion (not shown in FIG.) for regulating impulse member position on link.Lateral displacement mechanism comprises adjustment member and adjustment hole, adjustment member is screw, adjustment hole is screw, adjustment hole is arranged on link and impulse member, wherein, be positioned at adjustment hole on link and be provided with severally along the length direction of connecting rod, adjustment member is through fixing in the different adjustment hole of the adjustment hole on impulse member and link and make the position of impulse member on link adjustable, the lateral displacement that is jump bit is adjustable, so that different jump bits can contact the upper corresponding shock point in stake top simultaneously.By the adjusting of above governor motion, make two jump bit spacing, relative bearing and vertical height all adjustable.
Use procedure of the present invention is: the present invention is placed on to stake top, choose shock point on stake top, two jump bits are contacted to corresponding shock point, and impulse member is fixed on link, upwards pull link to make spring produce potential energy, decontrol link at suitable height, at this moment, link drives jump bit to implement to impact to stake top under elastic potential energy of the spring effect, makes two jump bits synchronously to stake face exciting, and two row stress waves of generation interfere in pile body.
Embodiment 2
The present embodiment is with the difference of embodiment 1: between link and support, be not directly connected, it is upper that link is bearing in stake top by impulse member, and link is applied to downward active force, drives each impulse member to move downward, jump bit is impacted on stake top simultaneously, realize synchronous exciter.Each impulse member on same circumference, i.e. each impulse member distribution that is centrosymmetric, correspondingly, link is made up of several connecting rods, impulse member is arranged on one end of connecting rod, and the other end of connecting rod collects and connects as central point, and this central point is the point of application of External Force Acting.
Use procedure of the present invention is: the present invention is placed on to stake top, choose shock point on stake top, two jump bits are contacted to corresponding shock point, and impulse member is fixed on link, the middle part that firmly hammer strikes link makes each jump bit synchronously to stake face exciting, and each row stress wave of generation interferes in pile body.
Embodiments of the present invention are not limited to this; according to foregoing of the present invention; according to ordinary skill knowledge and the customary means of this area; do not departing under the above-mentioned fundamental technics thought of the present invention prerequisite; the structure of the link of multi-point exciting device of the present invention, support, impulse member also has other embodiment; therefore the present invention can also make modification, replacement or the change of other various ways, within all dropping on rights protection scope of the present invention.
Claims (9)
1. one kind is detected the stress wave multi-point exciting method of pile quality, it is characterized in that: adopt two or more synchronous exciters on stake top, produce the above synchronous exciter stress wave of two row or two row transient state interference in pile body, because energy and the Amplitude-squared of ripple are directly proportional, the energy of the vibration reinforced region of the interference stresses ripple after interfering is strengthened, be beneficial to interference stresses ripple and be transmitted to a deep, so that the reflection wave signal detecting strengthens compared with the reflection wave signal of single point excitation, can more effectively reflect pile quality information.
2. the multi-point exciting device of the stress wave multi-point exciting method of the detection pile quality described in a right to use requirement 1, it is characterized in that: it comprises two or more impulse members, link and the support pushing up for being supported on stake, each impulse member is connected on link, and the bottom of impulse member has jump bit, described each impulse member is regular distribution on link, described link is arranged on the top of described support, described jump bit extends on stake top through described support, so that link under external force, drive each impulse member to move downward jump bit is impacted on stake top simultaneously, realize synchronous exciter.
3. multi-point exciting device according to claim 2, it is characterized in that: between described link and described support, be provided with vertical spring, described link is connected on described support by spring, link is applied to active force upwards, rely on the restoring force of spring to drive each impulse member and jump bit to move downward.
4. multi-point exciting device according to claim 3, it is characterized in that: described link and each impulse member adopt same material to make, described each impulse member is on same circumference, it is the distribution that is centrosymmetric of described each impulse member, correspondingly, described link is made up of several connecting rods, and impulse member is arranged on one end of connecting rod, the other end of connecting rod collects and connects as central point, and this central point is the point of application of External Force Acting.
5. according to the multi-point exciting device described in claim 2～4 any one, it is characterized in that: described support is made up of vertical pillar and the level board that is fixed on pillar upper end, position corresponding to impulse member on described level board has pilot hole, and described impulse member is passed down through pilot hole and stretches out.
6. multi-point exciting device according to claim 5, is characterized in that: between described impulse member and described link, be provided with the lifting regulating mechanism for regulating jump bit upper-lower position.
7. multi-point exciting device according to claim 6, it is characterized in that: described lifting regulating mechanism comprises adjustment member and adjustment hole, described adjustment hole is arranged on described link and impulse member, wherein, the adjustment hole being positioned on impulse member is provided with several along the length direction of impulse member, adjustment member makes the height of jump bit adjustable through fixing in the different adjustment hole of the adjustment hole on link and impulse member, so that two or more jump bit can contact the different position of the corresponding depth of an end face simultaneously.
8. multi-point exciting device according to claim 7, is characterized in that: between described impulse member and described link, be provided with the lateral displacement governor motion for regulating impulse member position on link.
9. multi-point exciting device according to claim 8, it is characterized in that: described lateral displacement mechanism comprises adjustment member and adjustment hole, described adjustment hole is arranged on described link and impulse member, wherein, the adjustment hole being positioned on link is provided with several along the length direction of connecting rod, adjustment member makes the position of jump bit on link adjustable through fixing in the different adjustment hole of the adjustment hole on impulse member and link, so that different jump bits can contact the upper corresponding shock point in stake top simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410039852.1A CN103821184B (en) | 2014-01-27 | 2014-01-27 | A kind of stress wave multi-point exciting method and multi-point exciting device detecting pile quality |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410039852.1A CN103821184B (en) | 2014-01-27 | 2014-01-27 | A kind of stress wave multi-point exciting method and multi-point exciting device detecting pile quality |
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| CN103821184A true CN103821184A (en) | 2014-05-28 |
| CN103821184B CN103821184B (en) | 2015-11-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569162A (en) * | 2014-12-29 | 2015-04-29 | 宁波升拓检测技术有限公司 | Single-impact type vibration excitation device applicable to nondestructive tests of long anchor rods/long anchor cables |
| CN112502198A (en) * | 2020-11-18 | 2021-03-16 | 无锡同济工程质量检测有限公司 | Online pile foundation detection system |
Citations (5)
| 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 |
| JP2009092444A (en) * | 2007-10-05 | 2009-04-30 | Tokyo Soil Research Co Ltd | Method and device for measuring pile shape |
| CN102127917A (en) * | 2010-12-03 | 2011-07-20 | 中国民航大学 | Low-strain testing device for detecting integrity of ultralong bored concrete pile |
| CN102296645A (en) * | 2011-06-02 | 2011-12-28 | 朱德兵 | Pile foundation quality detection method and device |
| CN102877490A (en) * | 2012-09-18 | 2013-01-16 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
-
2014
- 2014-01-27 CN CN201410039852.1A patent/CN103821184B/en active Active
Patent Citations (5)
| 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 |
| JP2009092444A (en) * | 2007-10-05 | 2009-04-30 | Tokyo Soil Research Co Ltd | Method and device for measuring pile shape |
| CN102127917A (en) * | 2010-12-03 | 2011-07-20 | 中国民航大学 | Low-strain testing device for detecting integrity of ultralong bored concrete pile |
| CN102296645A (en) * | 2011-06-02 | 2011-12-28 | 朱德兵 | Pile foundation quality detection method and device |
| CN102877490A (en) * | 2012-09-18 | 2013-01-16 | 河海大学 | Method for detecting quality of large-diameter tubular pile at low strain |
Non-Patent Citations (2)
| Title |
|---|
| 于世海等: ""基桩完整性检测的多点检测系统"", 《解放军理工大学学报（自然科学版）》 * |
| 楼国长等: ""长桩桩底低应变反射波检测技术的研究进展"", 《浙江建筑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569162A (en) * | 2014-12-29 | 2015-04-29 | 宁波升拓检测技术有限公司 | Single-impact type vibration excitation device applicable to nondestructive tests of long anchor rods/long anchor cables |
| CN112502198A (en) * | 2020-11-18 | 2021-03-16 | 无锡同济工程质量检测有限公司 | Online pile foundation detection system |
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| CN103821184B (en) | 2015-11-25 |
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