CN118067295B - Stress state analysis system and method for prestressed anchor cable - Google Patents
Stress state analysis system and method for prestressed anchor cable Download PDFInfo
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- CN118067295B CN118067295B CN202410451461.4A CN202410451461A CN118067295B CN 118067295 B CN118067295 B CN 118067295B CN 202410451461 A CN202410451461 A CN 202410451461A CN 118067295 B CN118067295 B CN 118067295B
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- 238000004458 analytical method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000012806 monitoring device Methods 0.000 claims abstract description 53
- 230000002950 deficient Effects 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 29
- 238000009530 blood pressure measurement Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 13
- 238000004873 anchoring Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
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- 238000005728 strengthening Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
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Abstract
The invention provides a stress state analysis system and a stress state analysis method for a prestressed anchor cable, wherein each part of the prestressed anchor cable, which is easy to generate prestress loss, is set as a pressure measuring point, and a pressure monitoring device is arranged at each pressure measuring point, so that a first pressure value at each pressure measuring point can be monitored in real time in the service process of the anchor cable, a plurality of comparison results are generated by comparing the first pressure value with each control pressure value, and the prestress loss state of the anchor cable is judged according to all the comparison results. Therefore, the invention accurately measures the pressure value at each pressure measuring point by arranging the plurality of pressure monitoring devices on the prestressed anchor cable so as to accurately measure the loss state of the prestress of the anchor cable, and further can effectively prevent engineering safety accidents.
Description
Technical Field
The invention relates to the technical field of engineering construction quality detection, in particular to a system and a method for analyzing the stress state of a prestressed anchor cable.
Background
The anchor cable is used as a rock-soil body reinforcing technology, can effectively control the deformation of the rock-soil body and has lower reinforcing cost, so that the anchor cable is widely applied to reinforcing projects such as foundation pits, slopes and the like, and particularly the prestressed anchor cable is widely applied to the projects. The prestress is a key that the prestress anchor cable can effectively control the deformation of a rock-soil body, and after the anchor cable is subjected to prestress, the prestress value can be reduced due to various factors within a certain time, and the prestress loss is serious, so that the structural body is damaged, and the anchoring engineering is failed. Therefore, the prestress loss condition of the anchor cable needs to be detected frequently, and engineering safety accidents are prevented from being caused.
The traditional method for measuring the prestress of the prestress anchor cable is to measure the stress value of the prestress anchor cable through a vibrating wire type stress meter, but the vibrating wire type stress meter is huge in size and difficult to install on an anchor cable structure well, and the vibrating wire type stress meter can only measure the stress value of the whole prestress anchor cable and cannot measure the pressure values of different parts of the prestress anchor cable respectively. As is well known, the anchor disc part of the anchoring section of the prestressed anchor cable and the outlet of the prestressed duct are all parts where grouting is easy to cause defects, so that the parts are easy to cause prestress loss in the service process of the anchor cable. Therefore, how to accurately monitor the pressure value of the portion of the prestressed anchorage cable where the prestress loss is likely to occur is a problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a stress state analysis system of a prestressed anchor cable, which comprises the following components: a plurality of pressure monitoring devices and stress state analysis equipment; the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable;
the pressure monitoring device is used for monitoring pressure values at each pressure measuring point of the prestressed anchor cable;
The stress state analysis equipment is used for acquiring first pressure values of the pre-stressed anchor cable at each pressure measuring point in the service period, comparing each first pressure value with a control pressure value of each corresponding pressure measuring point to generate a plurality of comparison results, and then determining the pre-stress loss state of the pre-stressed anchor cable according to the comparison results;
Wherein, the pressure measurement point includes: the upper part of each anchor disc in the pre-stressed anchor cable anchoring section, the lower part of the anchor head and a plurality of to-be-detected points preset in the pre-stressed anchor cable free section; the control pressure value is the pressure value born by each pressure measuring point after the pre-stressed anchor cable is tensioned and under the condition that no pre-stress loss occurs.
Further, the stress state analysis device compares each first pressure value with a control pressure value at each corresponding pressure measuring point to generate a plurality of comparison results, including:
dividing the first pressure value by the control pressure value at the corresponding pressure measuring point to obtain the residual pressure ratio at the pressure measuring point;
and taking the residual pressure ratio as a comparison result.
Further, the stress state analysis device determines a prestress loss state of the prestress anchor cable according to the comparison result, and the method comprises the following steps:
Regarding the pressure measuring point where the residual pressure ratio is smaller than a preset residual pressure threshold value as a defective pressure measuring point;
calculating the proportion of the defective pressure measuring points to the total number of all the pressure measuring points to obtain the defective proportion;
when the ratio of the residual times is not greater than a preset first ratio, determining that the prestress loss state of the prestress anchor cable is a slight loss state;
when the defective proportion is larger than the first proportion and is not larger than a preset second proportion, determining that the prestress loss state of the prestress anchor cable is a general loss state;
and when the defective proportion is larger than the second proportion, determining that the prestress loss state of the prestress anchor cable is a serious loss state.
Further, the pressure monitoring device is a circular pressure monitoring device;
the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable and comprises:
When a plurality of prestressed anchor cables are buried in a prestressed duct, the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable in a mode of encircling one or more outer rings of the prestressed anchor cables.
Further, the stress state analysis device is further used for monitoring second pressure values at each pressure measuring point in the process of tensioning the prestressed anchor cable; and determining the stress state at each pressure measuring point according to the second pressure value.
Further, the stress state analysis system of the pre-stressed anchor cable further comprises a slurry pressure monitoring device;
The slurry pressure monitoring device is used for monitoring the slurry pressure value of the grouting machine in the grouting process and transmitting the slurry pressure value to the stress state analysis equipment;
The stress state analysis equipment is also used for acquiring a third pressure value at each pressure measuring point of the prestressed anchor cable in the grouting process; calculating a pressure ratio of each of the third pressure values to the slurry pressure value; and generating grouting compactness grades at each pressure measuring point through the pressure ratio.
Further, the stress state analysis device is further configured to record and store the prestress loss state according to the engineering name, the anchor cable number, the prestress hole information and the inspector information after determining the prestress loss state of the prestress anchor cable;
And after the grouting compactness grade at each pressure measuring point is generated, recording and storing the grouting compactness grade according to the engineering name, the anchor cable number, the prestressed duct information and the detector information.
Another embodiment of the present invention provides a method for analyzing a stress state of a prestressed anchorage cable, which is applied to a stress state analyzing device in a stress state analyzing system of a prestressed anchorage cable according to any one of the embodiments of the present invention;
The stress state analysis method of the pre-stressed anchor cable comprises the following steps:
acquiring a first pressure value at each pressure measuring point of the prestressed anchor cable during the service period of the prestressed anchor cable;
Comparing each first pressure value with the control pressure value at each corresponding pressure measuring point to generate a plurality of comparison results;
determining the prestress loss state of the prestress anchor cable according to the comparison result;
Wherein, the pressure measurement point includes: the upper part of each anchor disc in the pre-stressed anchor cable anchoring section, the lower part of the anchor head and a plurality of to-be-detected points preset in the pre-stressed anchor cable free section; the control pressure value is the pressure value born by each pressure measuring point after the pre-stressed anchor cable is tensioned and under the condition that no pre-stress loss occurs.
Further, the method for analyzing the stress state of the prestressed anchor cable further comprises the following steps:
Monitoring a second pressure value at each pressure measuring point in the tensioning process of the prestressed anchor cable;
and determining the stress state at each pressure measuring point according to the second pressure value.
Further, the method for analyzing the stress state of the prestressed anchor cable further comprises the following steps:
in the grouting process, obtaining a third pressure value and a slurry pressure value at each pressure measuring point of the prestressed anchor cable;
Calculating a pressure ratio of each of the third pressure values to the slurry pressure value;
and outputting grouting compactness grades at each pressure measuring point of the prestressed anchor cable through the pressure ratio.
The invention has the following beneficial effects:
The invention provides a system and a method for analyzing the stress state of a prestressed anchor cable, wherein the positions of the prestressed anchor cable, which need to be monitored, are set as pressure measuring points, and a pressure monitoring device is arranged, so that a first pressure value at each pressure measuring point can be read in the service process of the anchor cable, a plurality of comparison results are generated by comparing the first pressure value with each control pressure value, and the loss state of the prestress of the anchor cable is judged according to all the comparison results. Therefore, the invention accurately measures the pressure value at each pressure measuring point by arranging the plurality of pressure monitoring devices on the prestressed anchor cable so as to accurately measure the loss state of the prestress of the anchor cable, and further can effectively prevent engineering safety accidents.
Drawings
Fig. 1 is a schematic structural diagram of a system for analyzing stress states of a prestressed anchorage cable according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pressure monitoring device according to an embodiment of the invention.
Fig. 3 is another structural schematic diagram of a system for analyzing stress state of a prestressed anchorage cable according to an embodiment of the present invention.
Fig. 4 is a flow chart of a method for analyzing a stress state of a prestressed anchorage cable according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a prestressed anchorage cable according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a structural schematic diagram of a system for analyzing stress state of a prestressed anchorage cable according to an embodiment of the present invention includes: a plurality of pressure monitoring devices and stress state analysis equipment; the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable;
the pressure monitoring device is used for monitoring pressure values at each pressure measuring point of the prestressed anchor cable;
wherein, the pressure measurement point includes: the upper part of each anchor disc in the pre-stressed anchor cable anchoring section, the lower part of the anchor head and a plurality of to-be-detected points preset in the pre-stressed anchor cable free section;
In an embodiment of the present invention, the upper part of each anchor disc of the prestressed anchor cable anchoring section, the lower part of the anchor head, that is, the outlet of the prestressed duct and the positions to be tested of the free section are used as pressure measuring points, and the pressure monitoring devices are arranged on each pressure measuring point to monitor the pressure value of each pressure measuring point in real time.
Before the pre-stressed anchor cable is buried, the professional needs to design the number and the positions of the points to be tested of the free section of the pre-stressed anchor cable according to the specific geographic environment, anchor cable materials, the size of the pre-stressed duct and other relevant parameters.
It should be further noted that before burying the pre-stressed anchor cable, each pressure monitoring device needs to be disposed at a position corresponding to the pre-stressed anchor cable, and a cable is used to connect each pressure monitoring device, so that the stress analysis device can obtain the electrical signals measured by each pressure monitoring device through the cable. And finally, inserting the prestressed anchor cable provided with the pressure monitoring device into the prestressed duct according to engineering design requirements.
Preferably, the pressure monitoring device is a circular pressure monitoring device;
the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable and comprises:
When a plurality of prestressed anchor cables are buried in a prestressed duct, the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable in a mode of encircling one or more outer rings of the prestressed anchor cables.
In an embodiment of the present invention, for measurement accuracy and installation environment consideration, the pressure monitoring device uses a semiconductor pressure sensor and a pressure measuring tube, specifically, as shown in fig. 2, a plastic pressure measuring tube with a circular shape and a DIP small-sized packaged pressure measuring chip integrated inside the plastic pressure measuring tube are used as the pressure monitoring device, and the pressure measuring accuracy of the pressure measuring chip can reach (0.5-1.5)% FS. It should be noted that, the size of the plastic pressure measuring tube is adjustable, so that the installation mode of the pressure monitoring device can be flexibly selected according to specific engineering environment and design requirements. Specifically, as shown in fig. 1 and fig. 3, when a plurality of prestressed anchor cables are buried in a prestressed duct, the pressure monitoring device may be disposed on a corresponding pressure measuring point by encircling one of the prestressed anchor cables, or may be disposed on a corresponding pressure measuring point by encircling the plurality of prestressed anchor cables. The flexibility of pressure monitoring device mounting means not only can let the staff select more efficient mounting means in a flexible way, reduces pressure sensing device's installation time, can also further effectively improve anchor rope's burying efficiency.
The stress state analysis equipment is used for acquiring a first pressure value of each pressure measuring point of the prestressed anchor cable in the service period; comparing each first pressure value with the control pressure value at each corresponding pressure measuring point to generate a plurality of comparison results; determining the prestress loss state of the prestress anchor cable according to the comparison result;
the control pressure value is a pressure value born by each pressure measuring point after the pre-stressed anchor cable is tensioned and under the condition that no pre-stress loss occurs.
In one embodiment of the present invention, it is known that the pre-stressing of the cable is reduced by various factors during the service phase of the pre-stressing cable. Therefore, in order to prevent various serious accidents caused by the prestress loss, a detector needs to periodically pass through the stress state analysis equipment to acquire a first pressure value at each pressure measuring point on the prestress anchor cable, and compare the first pressure value with the control pressure value to determine the prestress loss state of the prestress anchor cable.
It should be noted that, the stress state analysis device obtains the electrical signal measured by each pressure monitoring device on a prestressed anchor cable through the cable connected with each pressure monitoring device, and then further converts the electrical signal into a corresponding first pressure value. It will be appreciated that the manner in which the stress state analysis device communicates with each pressure monitoring device is due to engineering cost considerations. If safety and detection efficiency of detection personnel are considered, a device for wireless communication can be arranged in each pressure monitoring device, so that the stress state analysis equipment can remotely acquire signals of each pressure monitoring device in a wireless mode.
Preferably, the stress state analysis device compares each first pressure value with a control pressure value at each corresponding pressure measurement point to generate a plurality of comparison results, including:
dividing the first pressure value by the control pressure value at the corresponding pressure measuring point to obtain the residual pressure ratio at the pressure measuring point;
and taking the residual pressure ratio as a comparison result.
In a preferred embodiment of the invention, the control pressure value is based on the pressure value that the prestressed anchor cable should bear at each pressure measuring point after tensioning and without prestress loss. By dividing the first pressure value by the control pressure value at the corresponding pressure measuring point, the specific reduction degree of the pressure value of the pressure measuring point in the current period can be known specifically, and the specific reduction degree is used as a judging standard of the prestress loss state of the current prestress anchor cable, so that the current prestress loss degree of the prestress anchor cable can be determined more accurately.
Preferably, the stress state analysis device determines a prestress loss state of the prestress anchor cable according to the comparison result, and includes:
Regarding the pressure measuring point where the residual pressure ratio is smaller than a preset residual pressure threshold value as a defective pressure measuring point;
In a preferred embodiment of the present invention, the preset residual pressure threshold is set to 85%, and after data statistics and analysis, when the pressure value at a pressure measurement point is reduced to 85% of the corresponding control pressure value, the loss degree of the pressure value is high, and important attention is required.
Calculating the proportion of the defective pressure measuring points to the total number of all the pressure measuring points to obtain the defective proportion;
when the ratio of the residual times is not greater than a preset first ratio, determining that the prestress loss state of the prestress anchor cable is a slight loss state;
when the defective proportion is larger than the first proportion and is not larger than a preset second proportion, determining that the prestress loss state of the prestress anchor cable is a general loss state;
and when the defective proportion is larger than the second proportion, determining that the prestress loss state of the prestress anchor cable is a serious loss state.
In an embodiment of the present invention, the prestress loss state of the prestressed anchor cable is determined by calculating the proportion of the defective pressure measurement point to the total number of all the pressure measurement points, and it is understood that when the proportion of the defective pressure measurement point to all the pressure measurement points is up to a certain proportion, there is a higher risk of occurrence of engineering accidents, that is, the prestress loss degree of the prestressed anchor cable is higher, and the engineering party must take corresponding measures for compensating and stretching the prestress in time, otherwise, serious engineering safety accidents will occur, so that the prestress loss degree of the prestressed anchor cable can be more accurately determined by measuring the proportion of the defective pressure measurement point to all the pressure measurement points.
Specifically, the first ratio is set to 10% and the second ratio is set to 20% through a large amount of data statistics and analysis. That is, when the ratio of the residual number is not more than 10%, the prestress loss state of the prestress anchor cable can be determined to be a slight loss state, but no engineering accident caused by prestress loss can occur at present. When the defective proportion is more than 10% and not more than 20%, the prestress loss state of the prestress anchor cable can be determined to be a general loss state, and measures for strengthening monitoring frequency are needed to prevent engineering accidents caused by prestress loss. When the defective proportion is greater than 20%, determining that the prestress loss state of the prestress anchor cable is a serious loss state, and tensioning the prestress anchor cable in time.
Preferably, the stress state analysis device is further configured to monitor a second pressure value at each pressure measurement point during tensioning the prestressed anchor cable; and determining the stress state at each pressure measuring point according to the second pressure value.
In one embodiment of the present invention, the pre-stressed anchor cable is embedded in the pre-stressed duct before grouting due to the pressure monitoring devices. Therefore, after the slurry is solidified, in the process of tensioning and pre-stressing the pre-stressed anchor cable, the stress state analysis equipment is also used for monitoring the second pressure value at each pressure measuring point of the pre-stressed anchor cable at present and determining the stress state at each pressure measuring point according to the second pressure value. The stress state can intuitively help constructors to determine whether the prestressed anchor cable is tensioned in place or not, and the engineering quality of tensioning prestressing is effectively improved.
Preferably, the stress state analysis system of the pre-stressed anchor cable further comprises a slurry pressure monitoring device;
The slurry pressure monitoring device is used for monitoring the slurry pressure value of the grouting machine in the grouting process and transmitting the slurry pressure value to the stress state analysis equipment;
The stress state analysis equipment is also used for acquiring a third pressure value at each pressure measuring point of the prestressed anchor cable in the grouting process; calculating a pressure ratio of each of the third pressure values to the slurry pressure value; and generating grouting compactness grades at each pressure measuring point through the pressure ratio.
In one embodiment of the present invention, the pre-stressed anchor cable is embedded in the pre-stressed duct before grouting due to the pressure monitoring devices. Therefore, the stress state analysis equipment is further provided with a grouting quality evaluation function, and grouting compactness grades at each pressure measuring point are generated by calculating the pressure ratio of each third pressure value to the slurry pressure value.
Specifically, after grouting is started, a slurry pressure value with stable slurry is injected from a grouting pipeline buried at the bottom of a hole, the stress state analysis equipment acquires third pressure values of each pressure measuring point from a cable connected with each pressure monitoring device in real time, divides each third pressure value by the slurry pressure value to obtain a series of pressure ratios, and generates grouting compactness grades at each pressure measuring point through the pressure ratios. The grouting quality of the prestressed anchor cable duct is synchronously detected in the grouting process, so that constructors can monitor the anchor disc part of the prestressed anchor cable anchoring section and the outlet of the prestressed duct in real time in the grouting stage, and the parts which are easy to have defects in the grouting process are monitored in real time. And further effectively improves the efficiency and quality of grouting engineering.
Preferably, when the pressure ratio is greater than 0.90, determining that the grouting compactness grade at the corresponding pressure measuring point is good; when the pressure ratio is greater than 0.80 and not greater than 0.90, determining that the grouting compactness grade at the corresponding pressure measuring point is common; when the pressure ratio is not more than 0.80, determining that the grouting compactness grade at the corresponding pressure measuring point is insufficient;
In an embodiment of the present invention, when it is evaluated that the grouting compactness level of the prestressed anchorage cable at a pressure measuring point is insufficient, a constructor needs to clear holes and reinstall the prestressed anchorage cable for grouting. The condition that grouting is required to be emptied again and then the grouting is waited for solidification is avoided, and therefore engineering efficiency can be effectively improved through grouting and detection.
Preferably, the stress state analysis device is further configured to record and store the prestress loss state according to the engineering name, the anchor cable number, the prestress hole information and the inspector information after determining the prestress loss state of the prestress anchor cable;
And after the grouting compactness grade at each pressure measuring point is generated, recording and storing the grouting compactness grade according to the engineering name, the anchor cable number, the prestressed duct information and the detector information.
In an embodiment of the present invention, the stress state analysis device records and stores the prestress loss state according to the engineering name, the anchor cable number, the prestress hole information and the inspector information after the prestress loss state of the prestress anchor cable is detected each time. And after the grouting compactness grade at each pressure measuring point is generated, recording and storing the grouting compactness grade according to the engineering name, the anchor cable number, the prestressed duct information and the detector information. The method can provide effective data support for subsequent evaluation of engineering construction quality, evaluation of prestressed duct design and the like.
The invention provides a prestress anchor cable stress state analysis system, which is characterized in that the positions to be monitored of the prestress anchor cable are set to be pressure measuring points, and a pressure monitoring device is arranged, so that first pressure values at the pressure measuring points can be read in the service process of the anchor cable, a plurality of comparison results are generated by comparing the first pressure values with control pressure values, and the loss state of the prestress of the anchor cable is judged according to all the comparison results. Therefore, the invention accurately measures the pressure value at each pressure measuring point by arranging the plurality of pressure monitoring devices on the prestressed anchor cable so as to accurately measure the loss state of the prestress of the anchor cable, and further can effectively prevent engineering safety accidents.
Referring to fig. 4, a flow chart of a method for analyzing a stress state of a prestressed anchorage cable according to an embodiment of the present invention is provided, which is applied to a stress state analyzing device in a stress state analyzing system of a prestressed anchorage cable according to any one of the above embodiments of the present invention;
The stress state analysis method of the pre-stressed anchor cable comprises the following steps:
s1, acquiring a first pressure value at each pressure measuring point of the prestressed anchor cable in the service period of the prestressed anchor cable;
S2, comparing each first pressure value with a control pressure value at each corresponding pressure measuring point to generate a plurality of comparison results;
s3, determining a prestress loss state of the prestress anchor cable according to the comparison result;
wherein, the pressure measurement point includes: the upper part of each anchor disc in the pre-stressed anchor cable anchoring section, the lower part of the anchor head and a plurality of to-be-detected points preset in the pre-stressed anchor cable free section; the control pressure value is the pressure value born by each pressure measuring point after the pre-stressed anchor cable is tensioned and under the condition that no pre-stress loss occurs.
In an embodiment of the present invention, in order to prevent various serious accidents caused by the prestress loss, the prestress loss state of the prestress cable needs to be determined accurately by periodically passing through, obtaining a first pressure value at each pressure measuring point on the prestress cable, and comparing the first pressure value with the control pressure value.
Further, the comparing each first pressure value with the control pressure value at each corresponding pressure measuring point to generate a plurality of comparison results includes:
dividing the first pressure value by the control pressure value at the corresponding pressure measuring point to obtain the residual pressure ratio at the pressure measuring point;
and taking the residual pressure ratio as a comparison result.
Further, the determining the prestress loss state of the prestress anchor cable according to the comparison result includes:
Regarding the pressure measuring point where the residual pressure ratio is smaller than a preset residual pressure threshold value as a defective pressure measuring point;
calculating the proportion of the defective pressure measuring points to the total number of all the pressure measuring points to obtain the defective proportion;
when the ratio of the residual times is not greater than a preset first ratio, determining that the prestress loss state of the prestress anchor cable is a slight loss state;
when the defective proportion is larger than the first proportion and is not larger than a preset second proportion, determining that the prestress loss state of the prestress anchor cable is a general loss state;
and when the defective proportion is larger than the second proportion, determining that the prestress loss state of the prestress anchor cable is a serious loss state.
Preferably, the method for analyzing the stress state of the prestressed anchor cable further comprises the following steps:
Monitoring a second pressure value at each pressure measuring point in the tensioning process of the prestressed anchor cable;
and determining the stress state at each pressure measuring point according to the second pressure value.
In an embodiment of the present invention, during the process of stretching the pre-stress, a second pressure value at each pressure measuring point of the pre-stress anchor cable is also monitored, and the stress state at each pressure measuring point is determined according to the second pressure value. The stress state can intuitively help constructors to determine whether the prestressed anchor cable is tensioned in place or not, and the engineering quality of tensioning prestressing is effectively improved.
Preferably, the method for analyzing the stress state of the prestressed anchor cable further comprises the following steps:
in the grouting process, obtaining a third pressure value and a slurry pressure value at each pressure measuring point of the prestressed anchor cable;
Calculating a pressure ratio of each of the third pressure values to the slurry pressure value;
and outputting grouting compactness grades at each pressure measuring point of the prestressed anchor cable through the pressure ratio.
In one embodiment of the present invention, after grouting is started, a slurry pressure value, in which slurry is kept stable, is injected from a grouting pipe buried at the bottom of a hole, a third pressure value of each pressure measuring point is obtained in real time, and each third pressure value is divided by the slurry pressure value to obtain a series of pressure ratios, and grouting compactness grades at each pressure measuring point are generated through the pressure ratios. The grouting quality of the prestressed anchor cable duct is synchronously detected in the grouting process, so that constructors can control the grouting engineering in real time, the problems of incomplete and inaccurate grouting quality detection results caused by the fact that the grouting quality is not detected in certain positions in the prestressed duct are avoided, and the accuracy of grouting quality detection is greatly improved.
The invention provides a method for analyzing the stress state of a prestressed anchor cable, which is characterized in that a first pressure value at each pressure measuring point is read in the service process of the anchor cable, a plurality of comparison results are generated by comparing the first pressure value with each control pressure value, and the loss state of the prestress of the anchor cable is judged according to all the comparison results. Therefore, the invention accurately measures the pressure value at each pressure measuring point through the plurality of pressure monitoring devices arranged on the prestressed anchor cable, so that the loss state of the prestress of the anchor cable can be accurately measured, and the occurrence of engineering safety accidents can be further effectively prevented.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. A system for analyzing the stress state of a pre-stressed anchor cable, comprising: a plurality of pressure monitoring devices and stress state analysis equipment; the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable;
the pressure monitoring device is used for monitoring pressure values at each pressure measuring point of the prestressed anchor cable;
the stress state analysis equipment is used for acquiring a first pressure value of each pressure measuring point of the prestressed anchor cable in the service period, dividing the first pressure value by a control pressure value of the corresponding pressure measuring point to obtain the residual pressure ratio of the pressure measuring point; taking the residual pressure ratio as a comparison result, and then taking the pressure measuring point where the residual pressure ratio is smaller than a preset residual pressure threshold value as a defective pressure measuring point; calculating the proportion of the defective pressure measuring points to the total number of all the pressure measuring points to obtain the defective proportion; when the ratio of the residual times is not greater than a preset first ratio, determining that the prestress loss state of the prestress anchor cable is a slight loss state; when the defective proportion is larger than the first proportion and is not larger than a preset second proportion, determining that the prestress loss state of the prestress anchor cable is a general loss state; when the defective proportion is larger than the second proportion, determining that the prestress loss state of the prestress anchor cable is a serious loss state;
Wherein, the pressure measurement point includes: the upper part of each anchor disc in the pre-stressed anchor cable anchoring section, the lower part of the anchor head and a plurality of to-be-detected points preset in the pre-stressed anchor cable free section; the control pressure value is the pressure value born by each pressure measuring point after the pre-stressed anchor cable is tensioned and under the condition that no pre-stress loss occurs.
2. The system for analyzing the stress state of the prestressed anchorage cable according to claim 1, wherein the pressure monitoring device is a circular pressure monitoring device;
the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable and comprises:
When a plurality of prestressed anchor cables are buried in a prestressed duct, the pressure monitoring device is arranged on each pressure measuring point of the prestressed anchor cable in a mode of encircling one or more outer rings of the prestressed anchor cables.
3. The system for analyzing the stress state of the prestressed anchorage cable according to claim 2, wherein the stress state analyzing device is further used for monitoring the second pressure value at each pressure measuring point in the process of stretching the prestressed anchorage cable; and determining the stress state at each pressure measuring point according to the second pressure value.
4. The system for analyzing the stress state of the prestressed anchorage cable according to claim 3, further comprising a slurry pressure monitoring device;
The slurry pressure monitoring device is used for monitoring the slurry pressure value of the grouting machine in the grouting process and transmitting the slurry pressure value to the stress state analysis equipment;
The stress state analysis equipment is also used for acquiring a third pressure value at each pressure measuring point of the prestressed anchor cable in the grouting process; calculating a pressure ratio of each of the third pressure values to the slurry pressure value; and generating grouting compactness grades at each pressure measuring point through the pressure ratio.
5. The system for analyzing the stress state of the prestressed anchorage cable according to claim 4, wherein the stress state analyzing device is further used for recording and storing the prestress loss state according to engineering names, anchorage cable numbers, prestressed duct information and detection personnel information after the prestress loss state of the prestressed anchorage cable is determined;
And after the grouting compactness grade at each pressure measuring point is generated, recording and storing the grouting compactness grade according to the engineering name, the anchor cable number, the prestressed duct information and the detector information.
6. A method for analyzing the stress state of a prestressed anchorage cable, which is applied to a stress state analyzing device in a stress state analyzing system of a prestressed anchorage cable according to any one of claims 1 to 5;
The stress state analysis method of the pre-stressed anchor cable comprises the following steps:
acquiring a first pressure value at each pressure measuring point of the prestressed anchor cable during the service period of the prestressed anchor cable;
Dividing the first pressure value by the control pressure value at the corresponding pressure measuring point to obtain the residual pressure ratio at the pressure measuring point; taking the residual pressure ratio as a comparison result;
Regarding the pressure measuring point where the residual pressure ratio is smaller than a preset residual pressure threshold value as a defective pressure measuring point;
calculating the proportion of the defective pressure measuring points to the total number of all the pressure measuring points to obtain the defective proportion;
when the ratio of the residual times is not greater than a preset first ratio, determining that the prestress loss state of the prestress anchor cable is a slight loss state;
when the defective proportion is larger than the first proportion and is not larger than a preset second proportion, determining that the prestress loss state of the prestress anchor cable is a general loss state;
when the defective proportion is larger than the second proportion, determining that the prestress loss state of the prestress anchor cable is a serious loss state;
wherein, the pressure measurement point includes: the upper part of each anchor disc in the pre-stressed anchor cable anchoring section, the lower part of the anchor head and a plurality of to-be-detected points preset in the pre-stressed anchor cable free section; the control pressure value is the pressure value born by each pressure measuring point after the pre-stressed anchor cable is tensioned and under the condition that no pre-stress loss occurs.
7. The method of analyzing the stress state of a pre-stressed anchor cable of claim 6, further comprising:
Monitoring a second pressure value at each pressure measuring point in the tensioning process of the prestressed anchor cable;
and determining the stress state at each pressure measuring point according to the second pressure value.
8. The method of analyzing the stress state of a pre-stressed anchor cable of claim 7, further comprising:
in the grouting process, obtaining a third pressure value and a slurry pressure value at each pressure measuring point of the prestressed anchor cable;
Calculating a pressure ratio of each of the third pressure values to the slurry pressure value;
and outputting grouting compactness grades at each pressure measuring point of the prestressed anchor cable through the pressure ratio.
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| EP2248951B1 (en) * | 2009-05-08 | 2014-01-15 | Lechner, Peter | Method and device for determining the axial force progression in a pressure-grouted anchor |
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| CN107657124B (en) * | 2017-09-30 | 2019-07-23 | 成都理工大学 | A kind of loss of anchorage force of pre-stressed anchor cable calculation method considering the strong off-load of high slope |
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