CN111549835A - Static load detection device and static load detection system - Google Patents
Static load detection device and static load detection system Download PDFInfo
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- CN111549835A CN111549835A CN202010469483.5A CN202010469483A CN111549835A CN 111549835 A CN111549835 A CN 111549835A CN 202010469483 A CN202010469483 A CN 202010469483A CN 111549835 A CN111549835 A CN 111549835A
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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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Abstract
The invention discloses a static load detection device and a static load detection system, and belongs to the technical field of building construction. The static load detection device is applied to pile foundation static load detection and comprises the following components: a platform; a load member coupled to the platform; the loading assembly is arranged on the platform and is connected with the loading part; the pair of balance parts are respectively arranged on two sides of the platform, one end of each balance part is connected with the platform, the other end of each balance part is used for being installed on the bearing surface, and the balance parts are in surface contact with the bearing surface. The static load detection device can avoid the problem of deflection or collapse caused by unbalance of load loading points in the detection process.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a static load detection device and a static load detection system.
Background
The static load detection technology of the pile foundation is developed along with the fact that the pile foundation is widely used in building design. The common static load test mostly adopts a counterweight block stacking method, the counterweight block stacking method is to gradually add counterweight blocks to the pile foundation to be detected, and the displacement of the pile foundation to be detected under different pressures is tested. The balancing weight stacking method is simple and effective, but the balancing weight stacking method is characterized in that the balancing weight is gradually increased, the integral balance point is difficult to control, the stacking center is difficult to control, when the stacking weight is stacked more, the integral eccentricity of the stacking weight stacking is larger, and a certain angle or a certain edge of a stacking platform is easy to cause to be in a suspension state, so that the maximum loading capacity required by the test cannot be loaded by the balancing weight stacking method, and if the operation is performed, the phenomenon that a certain angle or a certain edge of the stacking platform is suspended is not discovered in time, and serious collapse can be caused when the stacking amount of the balancing weight is too much.
Disclosure of Invention
In order to solve the defects of the prior art, the embodiment of the invention provides a static load detection device which can ensure that the integral balance point is kept unchanged when the pressure loaded on a foundation pile is increased.
In a first aspect, an embodiment of the present invention provides a static load detection apparatus, which is applied to pile foundation static load detection, and includes:
a platform;
a load member coupled to the platform;
the loading assembly is arranged on the platform and is connected with the loading part;
the pair of balance parts are respectively arranged on two sides of the platform, one end of each balance part is connected with the platform, the other end of each balance part is used for being installed on the bearing surface, and the balance parts are in surface contact with the bearing surface.
Optionally, the load member includes a reaction pile, and the platform is provided with a through hole through which the reaction pile passes.
Optionally, the loading assembly comprises a first drive member connected to the reaction pile, the first drive member providing a driving force for the reaction pile to move.
Optionally, the loading assembly further comprises:
the clamping plate is arranged on the periphery of the reaction pile;
and the second driving part is connected with the clamping plate and drives the clamping plate to clamp the reaction pile.
Optionally, the loading assembly further comprises a weight, one end of the weight is disposed on the platform, the other end of the weight is connected to the first driving component, and the clamping plate is connected to the weight.
Optionally, a pressure sensor is connected to the end of the load member.
Optionally, the balancing members include two pairs, one pair of the balancing members is disposed on the left and right sides of the platform, and the other pair of the balancing members is disposed on the front and rear sides of the platform.
Optionally, the vehicle further comprises a traveling mechanism, wherein the traveling mechanism comprises:
the third driving part is connected with the balancing part and drives the balancing part to move close to or away from the platform;
and the fourth driving part is connected with the balancing part and drives the balancing part to do linear motion on a plane parallel to the platform.
In a second aspect, an embodiment of the present invention further provides a static load detection system, including the static load detection device as described above, and further including a pile foundation to be detected, where the load member is loaded on the pile foundation to be detected.
Optionally, a jack is arranged between the load component and the pile foundation to be tested, a steel plate is arranged between the jack and the pile foundation to be tested, and the surface joint of the steel plate is larger than the cross-sectional area of the jack and the pile foundation to be tested.
The invention has the beneficial effects that:
the embodiment of the invention provides a static load detection device, which comprises: a platform; a load member coupled to the platform; the loading assembly is arranged on the platform and is connected with the loading part; the pair of balance parts are respectively arranged on two sides of the platform, one end of each balance part is connected with the platform, the other end of each balance part is used for being installed on the bearing surface, and the balance parts are in surface contact with the bearing surface. The static load detection device provided by the embodiment of the invention provides an initial load for the pile foundation to be detected through the load part, the load of the load part acting on the pile foundation to be detected is increased or reduced through the load assembly, when the load acting on the pile foundation to be detected is eccentric, unbalanced force is transmitted to the platform, so that the platform is deflected, and the deflection of the platform is resisted through the at least one pair of balance parts supporting the platform, so that the overall balance is ensured, and the balance parts are in surface contact with the bearing surface, so that the overall balance of the static load detection device can be ensured only through one pair of balance parts.
Drawings
The advantages of the above and/or additional aspects of the present invention will become apparent and readily appreciated from the following description of the embodiments taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a pile foundation to be tested according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a dead load detection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a dead load detection system according to an embodiment of the present invention.
Wherein the correspondence between the reference numbers and the names of the components in fig. 1 to 3 is:
1. a pile foundation to be tested; 2. a load member; 3. a platform; 4. a balance member; 50. a first drive member; 51. a clamping plate; 52. a second drive member; 53. a weight block; 6. a pressure sensor; 7. a jack; 8. a steel plate; 9. a third drive member; 10. a displacement sensor; 11. a displacement meter; 12. a reference pile; 13. a reference beam; 30. and (6) a via hole.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
The static load detection device provided by the embodiment of the invention is applied to pile foundation static load detection. Like figure 1, pile foundation 1 sets up in the foundation ditch, and pile foundation 1's top exposes, when carrying out the static load and detecting, at pile foundation 1's top loading load, at certain load range, detects the displacement amount of pile foundation 1 in the foundation ditch to the steadiness of sign pile foundation 1. At present, the load loading on pile foundation 1 is generally through setting up the heap platform on pile foundation 1, and it is in order to increase the load step by step to increase the balancing weight on the heap platform, and when the static load was examined, the balance point of balancing weight was difficult to control, and when balancing weight quantity was more, the heap carried off-centre and is enlargied, can lead to serious collapse phenomenon even when serious.
In order to solve the problem that the balance point is difficult to control during the static load detection of the pile foundation, as shown in fig. 2 and 3, an embodiment of the invention provides a static load detection device, which comprises a load component 2, a loading assembly, a platform 3 and at least one pair of balance components 4.
The load part 2 has a certain load, and the load part 2 can act on the pile foundation 1 to be tested to generate an initial load.
The loading subassembly, the loading subassembly links to each other with load part 2, and when the pile foundation 1 static load that awaits measuring is examined, the loading subassembly is used for increasing or reducing the load that is used in the pile foundation 1 that awaits measuring to detect the displacement volume of the pile foundation 1 that awaits measuring under the load of difference.
The platform 3, the loading assembly and the loading part 2 are taken as a whole body which moves together, the loading part 2 acts on the pile foundation 1 to be tested, when the position of the loading part 2 relative to the pile foundation 1 to be tested generates eccentricity, if the eccentricity is enough to cause the deflection of the loading part 2 relative to the pile foundation 1 to be tested, the loading assembly and the platform 3 connected with the loading part 2 deflect along with the eccentricity, therefore, in the embodiment of the invention, the motion of the loading part 2 caused by the instability of the loading part 2 relative to the balance point of the pile foundation 1 to be tested is converted into the motion of the platform 3, and the control of the balance point between the loading part 2 and the pile foundation 1 to be tested can be realized through the limitation of the motion of the platform 3.
In the embodiment of the invention, the balance of the platform 3 is controlled by at least one pair of balance parts 4, so that the control of the balance point of the load part 2 and the pile foundation 1 to be tested is controlled. Wherein, a pair of balancing unit 4 sets up respectively in the both sides of platform 3, and the one end of balancing unit 4 links to each other with platform 3, and the other end of balancing unit 4 is installed on the loading face, and balancing unit 4 and bearing surface face contact. The bearing surface can be selected as the ground or other bearing planes, such as an additional bearing platform, for performing static load detection on the pile foundation 1 to be detected.
In one embodiment, the balance member 4 includes a pair, respectively disposed on both sides of the platform 3. The pair of balance parts 4 act on the platform 3, so that the platform 3 can keep a preset balance state without being changed by the deviation of a balance point between the load part 2 and the pile foundation 1 to be tested, and the balance state between the load part 2 and the pile foundation 1 to be tested is always kept. For example, when the eccentricity between the load component 2 and the pile foundation 1 to be tested causes the load component 2 to deflect towards any side corresponding to the pair of balance components 4, the platform 3 correspondingly deflects towards the side, obviously, under the action of the balance components 4, the platform 3 is kept in a balanced state, the deflection is resisted, and then the load component 2 and the pile foundation 1 to be tested are kept in a balanced state; in addition, if the eccentricity between the load component 2 and the pile foundation 1 to be detected causes the load component 2 to deflect towards the side staggered with the pair of balance components 4, at the moment, because the balance components 4 are in surface contact with the bearing surface, the balance components have the capability of resisting the platform 3 to deflect towards other directions, therefore, the balance of the platform 3 can be ensured only by the pair of balance components 4, and further, the load component 2 and the pile foundation 1 to be detected are always kept in a balanced state in the static load detection process.
In an alternative embodiment, the balance members 4 may be selected to include two pairs, one pair of the balance members 4 being disposed on the left and right sides of the platform 3, respectively, and the other pair of the balance members 4 being disposed on the front and rear sides of the platform 3, respectively.
Of course, a person skilled in the art may make some simple changes to the number and arrangement of the balance members 4, for example, select the number of the balance members 4 to be 3, so that 3 balance members 4 are arranged in a triangular structure below the platform 3, or increase the number of the balance members 4 to increase the supporting points, and it should be understood that these changes are obtained by simple and direct changes of the technical solution of the embodiment of the present invention, and it should be within the protection scope of the present invention.
It should be noted that, in the existing scheme of stacking a balancing weight on a platform, the platform serves as a force transmission medium to transmit a load to the pile foundation 1 to be tested, compared with the prior art, in the embodiment of the present invention, the platform 3 does not serve as a load transmission medium, the load acts on the pile foundation 1 to be tested through the load component 2, and the platform 3 serves: when the load component 2 and the pile foundation 1 to be tested may deflect due to unbalance, the balance of the platform 3 is kept through the balance component 4, and further the balance of the load component 2 and the pile foundation 1 to be tested is kept.
In an alternative embodiment, the load part 2 may be selected as a reaction pile, as shown in fig. 2, when the pile foundation 1 to be tested is in static load detection, the reaction pile is vertically arranged, the lower end of the reaction pile is arranged at the top end of the pile foundation 1 to be tested, the platform 3 is provided with a through hole 30, and the reaction pile passes through the through hole 30.
The loading assembly comprises a first drive member 50, which first drive member 50 is connected to the reaction force pile. In this embodiment, the first driving member 50 provides a driving force for the reaction pile to move toward or away from the pile foundation 1 to be tested. The roles of the first drive member 50 include: driving the counterforce pile to move to be in contact with the pile foundation 1 to be detected before static load detection of the pile foundation 1 to be detected, or driving the counterforce pile to move to be separated from the pile foundation 1 to be detected after static load detection of the pile foundation 1 to be detected; in the process of the static load detection of the pile foundation 1 to be detected, the driving force acts on the counterforce pile to increase or reduce the load capacity of the counterforce pile acting on the pile foundation 1 to be detected, so that the pile foundation 1 to be detected is detected under different loads. In this embodiment, the load capacity loaded on the pile foundation 1 to be detected can be continuously adjusted, so that the detection result is more accurate.
The loading assembly further comprises a clamping plate 51 and a second drive member 52. The clamping plate 51 is arranged around the reaction pile, the second driving member 52 is connected to the clamping plate 51, and the second driving member 52 drives the clamping plate 51 such that the clamping plate 51 clamps the reaction pile.
In an alternative embodiment, the first driving member 50 may be selected to be connected to the clamping plate 51, and the second driving member 52 drives the clamping plate 51 to work to clamp and fasten the reaction pile during static load detection, the first driving member 50 drives the reaction pile to move towards or away from the pile foundation 1 to be tested, and the clamping plate 51 may be selected to have a surface which is in contact with the outer surface of the reaction pile, so that the clamping plate 51 and the reaction pile are in surface contact, and the stability between the clamping plate 51 and the reaction pile is increased. In addition, at platform 3 department, can select to laminate mutually for the inner wall of via hole 30 and the surface of reaction pile, consequently, guarantee the vertical degree of reaction pile through the combined action of grip block 51 and via hole 30, under the balanced condition of pre-adjustment between reaction pile and the pile foundation 1 that awaits measuring, grip block 51 and via hole 30 can further guarantee the in-process that detects, the balance between reaction pile and the pile foundation 1 that awaits measuring.
The loading assembly further comprises a weight 53, one end of the weight 53 being disposed on the platform 3, the other end of the weight 53 being connected to the first drive member 50, the clamping plate 51 being connected to the weight 53. After the second driving member 52 drives the clamping plate 51 to clamp the reaction pile, the clamping plate 51, the weight 52 and the platform 3 form a whole body moving together, wherein the bearing point of the whole body is the pile foundation 1 to be tested, so that the weight of the weight 53, the platform 3, the clamping plate 51 and other members acts on the pile foundation 1 to be tested together, and is used as the load loaded on the pile foundation 1 to be tested during detection. The first driving part 50 provides driving force, and continuously increases or decreases the load acting on the pile foundation 1 to be tested during static load detection.
The process of detecting the static load of the pile foundation 1 to be detected comprises the following steps:
loading the reaction pile on the loading assembly, enabling the reaction pile to penetrate through the through hole 30, and clamping the reaction pile through the clamping plate 51;
the first driving part 50 works to enable the reaction pile to be in contact with the pile foundation 1 to be tested;
the first driving part 50 continues to work, so that the load capacity of the reaction pile loaded on the pile foundation 1 to be detected is increased, and the displacement variation of the pile foundation 1 to be detected is detected.
In the embodiment of the present invention, the first driving part 50 may be selected as an oil cylinder to provide a stable and continuous driving force. Similarly, the second driving member 51 may be selected as a cylinder.
In an alternative embodiment, the end of the load part 2 (reaction pile) is connected with a pressure sensor 6, and the pressure sensor 6 is used for detecting the pressure of the load part 2 acting on the pile foundation 1 to be detected, so as to represent the load capacity at the moment. In the pile foundation 1 static load testing process that awaits measuring, measure the pressure value that load part 2 was used in the pile foundation 1 that awaits measuring through pressure sensor 6 in real time to the size of the load capacity of real-time representation effect on the pile foundation 1 that awaits measuring, with the size of this load capacity and the variable quantity construction relevance of the displacement volume of pile foundation 1 that awaits measuring, in order to obtain the performance of pile foundation 1 that awaits measuring.
As shown in fig. 3, in an optional embodiment, a jack 7 is disposed between the load component 2 and the pile foundation 1 to be tested, that is, the load component 2 acts on the jack 7, and the jack 7 transfers the load amount and acts on the pile foundation 1 to be tested, in this embodiment, the pressure sensor 6 may also be selectively connected to the jack 7, so as to obtain the load amount of the jack 7 acting on the pile foundation 1 to be tested in real time.
Be provided with steel sheet 8 between jack 7 and the pile foundation 1 that awaits measuring, steel sheet 8's area is greater than jack 7 and the cross-sectional area of the pile foundation 1 that awaits measuring, and the setting of steel sheet 8 has further increased the equilibrium between load part 2 and the pile foundation 1 that awaits measuring.
The static load detection device provided by the embodiment of the invention also comprises the travelling mechanism, and the travelling mechanism can realize the integral movement of the static load detection device, so that the static load detection device can be conveniently moved to different detection positions, and continuous and efficient detection is realized.
In one embodiment, the traveling mechanism includes: the third driving part 9, the third driving part 9 is connected with the balance part 4, and the third driving part 9 drives the balance part 4 to move close to or far away from the platform 3; and a fourth driving member (not shown) connected to the balance member 4 for driving the balance member to move linearly in a plane parallel to the stage 3. In the present embodiment, the balance members 4 include two pairs, one pair of the balance members 4 being located on the left and right sides of the platform 3, and the other pair of the balance members 4 being located on the front and rear sides of the platform 3. For this purpose, the running gear comprises two pairs, which act on two pairs of balancing members 4, respectively.
Specifically, it is possible to select that the pair of balance members 4 located on the left and right sides of the platform 3 realize the up-and-down and front-and-rear movement with respect to the platform 3, and the pair of balance members 4 located on the front and rear sides of the platform 3 realize the up-and-down and left-and-right movement with respect to the platform 3. When the platform moves forwards and backwards, the pair of balance parts 4 positioned at the front side and the rear side of the platform 3 are driven by the opposite third driving parts 9 to rise, at the moment, the pair of balance parts 4 positioned at the left side and the right side of the platform 3 are contacted with the supporting surface, the pair of balance parts 4 positioned at the front side and the rear side of the platform 3 are suspended, and the pair of balance parts 4 positioned at the left side and the right side of the platform 3 do linear motion on a horizontal plane parallel to the plane of the platform 3 under the driving of the fourth driving part, at the moment, the linear motion is linear motion along the front-rear direction of the platform 3; similarly, when the static load detection device moves left and right, the balance parts 4 on the left side and the right side are lifted, and the balance parts 4 on the front side and the rear side are driven by the fourth driving part to do linear motion along the left and right directions on the plane parallel to the platform 3 so as to drive the static load detection device to move. In this embodiment, two pairs of balance members 4 are driven by two pairs of traveling mechanisms to alternately move, so that the static load detection device can be conveniently moved.
Wherein, the third driving component 9 and the fourth driving component can be selected as oil cylinders.
On the basis of the above technical solution, as shown in fig. 3, an embodiment of the present invention further provides a static load detection system, including: the static load detection device and the pile foundation 1 to be detected are as described above, wherein the load part 2 is loaded on the pile foundation 1 to be detected.
Optionally, a jack 7 is further arranged between the load part 2 and the pile foundation 1 to be tested.
Optionally, a steel plate 8 is arranged between the jack 7 and the pile foundation 1 to be tested, and the surface joint of the steel plate 8 is larger than the cross-sectional area of the jack 7 and the pile foundation 1 to be tested.
Referring to fig. 1 and fig. 3, in the embodiment of the present invention, the static load detection system further includes: and the displacement sensor 10 is used for detecting the displacement generated by the pile foundation 1 to be detected, namely detecting the displacement generated by the pile foundation 1 to be detected under the action of the load.
The displacement sensor 10 is connected with a displacement meter 11, and the displacement meter 11 is used for displaying displacement data detected by the displacement sensor 10 so as to display displacement generated by the loading effect of the pile foundation 1 to be detected in real time.
In the embodiment of the invention, the pressure sensor 6 can detect the numerical value of the load acting on the pile foundation 1 to be tested in real time, and the displacement meter 11 connected with the displacement sensor 10 can display the displacement of the pile foundation 1 to be tested caused by the action of the load in real time, so that a tester can obtain the relationship between the load and the displacement of the pile foundation 1 to be tested in real time and quickly know the performance of the device 1 to be tested. In addition, in the embodiment of the invention, the load acting on the pile foundation 1 to be tested can be continuously changed, which is beneficial to knowing the change condition of the displacement of the pile foundation 1 to be tested at each load point.
The periphery of the pile foundation 1 to be measured is provided with a reference pile 12, the displacement meter 11 is arranged on the reference pile 12, the reference pile 12 is provided with a reference beam 13, and the displacement sensor 10 is arranged on the reference beam 13.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the communication may be direct, indirect via an intermediate medium, or internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a static load detection device uses and detects at pile foundation static load, a serial communication port, include:
a platform;
a load member coupled to the platform;
the loading assembly is arranged on the platform and is connected with the loading part;
the pair of balance parts are respectively arranged on two sides of the platform, one end of each balance part is connected with the platform, the other end of each balance part is used for being installed on the bearing surface, and the balance parts are in surface contact with the bearing surface.
2. The static load detection device according to claim 1, wherein the load member comprises a reaction pile, and the platform is provided with a through hole, and the reaction pile passes through the through hole.
3. The static load detection device according to claim 2, wherein the loading assembly comprises a first drive member, the first drive member being connected to the reaction pile, the first drive member providing a driving force for the reaction pile to move.
4. The dead load detection device of claim 3, the loading assembly further comprising:
the clamping plate is arranged on the periphery of the reaction pile;
and the second driving part is connected with the clamping plate and drives the clamping plate to clamp the reaction pile.
5. The static load detection device of claim 4, wherein the loading assembly further comprises a weight, one end of the weight is disposed on the platform, the other end of the weight is connected to the first driving member, and the clamping plate is connected to the weight.
6. The static load detection device according to claim 3, wherein a pressure sensor is connected to a distal end of the load member.
7. The static load detection device according to claim 1, wherein the balance members include two pairs, one pair of the balance members being disposed on the left and right sides of the platform, and the other pair of the balance members being disposed on the front and rear sides of the platform.
8. The static load detection device according to claim 7, further comprising a traveling mechanism, the traveling mechanism comprising:
the third driving part is connected with the balancing part and drives the balancing part to move close to or away from the platform;
and the fourth driving part is connected with the balancing part and drives the balancing part to do linear motion on a plane parallel to the platform.
9. A static load detection system, comprising the static load detection device as claimed in any one of claims 1 to 8, and further comprising a pile foundation to be detected, wherein the load member is loaded on the pile foundation to be detected.
10. The static load detection system according to claim 9, wherein a jack is arranged between the load component and the pile foundation to be detected, a steel plate is arranged between the jack and the pile foundation to be detected, and the surface joint of the steel plate is larger than the cross-sectional area of the jack and the cross-sectional area of the pile foundation to be detected.
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| CN202010469483.5A CN111549835A (en) | 2020-05-28 | 2020-05-28 | Static load detection device and static load detection system |
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| CN202010469483.5A CN111549835A (en) | 2020-05-28 | 2020-05-28 | Static load detection device and static load detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482452A (en) * | 2020-12-07 | 2021-03-12 | 福建永信德工程检测有限公司 | Pile foundation static load automatic detection device and detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482452A (en) * | 2020-12-07 | 2021-03-12 | 福建永信德工程检测有限公司 | Pile foundation static load automatic detection device and detection method |
| CN112482452B (en) * | 2020-12-07 | 2022-02-18 | 福建永信德工程检测有限公司 | Pile foundation static load automatic detection device and detection method |
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