CN110374003B - Suspension bridge cable clamp screw axial force synchronous construction system and use method thereof - Google Patents
Suspension bridge cable clamp screw axial force synchronous construction system and use method thereof Download PDFInfo
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- CN110374003B CN110374003B CN201910596961.6A CN201910596961A CN110374003B CN 110374003 B CN110374003 B CN 110374003B CN 201910596961 A CN201910596961 A CN 201910596961A CN 110374003 B CN110374003 B CN 110374003B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
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Abstract
The invention discloses a suspension bridge cable clamp screw axial force synchronous construction system and a use method thereof, wherein the suspension bridge cable clamp screw axial force synchronous construction system comprises the following steps: the tensioning device is connected with the screw rod to be tensioned and used for tensioning the screw rod to be tensioned; the ultrasonic detection device is used for connecting with the screw to be tensioned, transmitting an ultrasonic signal into the screw to be tensioned and detecting the propagation time of the ultrasonic signal in the screw to be tensioned to go back and forth once; the control device is connected with the tensioning device and the ultrasonic detection device and is used for detecting t2、t3And calculating the corrected construction axial force F in the screw to be tensioned by a preset formula2And controlling the tensioning device to adopt the corrected construction axial force F2Tensioning a screw rod to be tensioned, relating to the technical field of bridge engineering construction. The invention makes a correction scheme aiming at the self retraction loss condition of a single tensioning screw, and properly solves the engineering problems of large axial force loss and large randomness of the screw after the nut is tightened.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to a suspension bridge cable clamp screw axial force synchronous construction system and a using method thereof.
Background
The suspension bridge cable clamp is one of main components of a suspension bridge superstructure, the main defect in the using process is that the cable clamp slides on a main cable due to insufficient axial force of a cable clamp screw, the national highway bridge culvert maintenance specification (2004)3.3.9 requires checking whether the cable clamp of the upper end of a suspension bridge suspender and the main cable is loosened, displaced and damaged, and the cable clamp sliding larger than 10mm in the highway bridge technical condition evaluation standard (2011)7.2.1 is regarded as serious defect.
At present, during actual construction of a cable clamp screw, a jack is generally adopted to stretch the screw to a construction axial force for load holding, then a worker pulls a nut tightly by a short wrench, grading operation is adopted in the stretching process, the grade is generally divided into 2-3 grades, the jack returns oil after each grade pulls the nut tightly, and finally construction is finished.
However, in the current jack tensioning process, because the roughness conditions of the contact surfaces of the nut, the cushion block and the cable clamp are different, and the processing conditions of the screw threads are slightly different, the randomness of the degree of tightening the nut by workers is larger, the axial force loss of the screw after oil return of the jack is larger, the randomness is also larger, and the axial force loss range of the screw after tensioning is different from 10% to 60% according to the actual measurement condition of a certain bridge; the axial force fastening construction of the cable clamp screw is difficult to accurately control, the axial force of the screw cannot be timely checked after the construction is finished, and the later-stage re-pulling after the inspection can bring large workload, increase the construction cost and easily delay the construction period.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a suspension bridge cable clamp screw axial force synchronous construction system capable of improving the construction control precision of the screw axial force and a use method thereof.
The invention provides a suspension bridge cable clamp screw axial force synchronous construction system, which comprises:
the tensioning device is connected with the screw rod to be tensioned and used for tensioning the screw rod to be tensioned;
the ultrasonic detection device is used for connecting with the screw to be tensioned, transmitting an ultrasonic signal into the screw to be tensioned and detecting the propagation time of the ultrasonic signal in the screw to be tensioned to go back and forth once;
the control device is connected with the tensioning device and the ultrasonic detection device and is used for controlling the tensioning device to adopt a preset axial force to stretch the screw to be tensioned to a first state, controlling the ultrasonic detection device to emit an ultrasonic signal in the first state and acquiring the propagation time t of the ultrasonic signal which comes and goes once in the screw to be tensioned2(ii) a The control device is also used for controlling the tensioning device to unload the preset axial force so as to enable the screw to be tensioned to be in a second state, and controlling the ultrasonic detection device to emit an ultrasonic signal and obtain the propagation time t of the ultrasonic signal to and fro once in the screw to be tensioned in the second state3(ii) a The control device is also used for controlling the motor according to t2、t3And calculating the corrected construction axial force F in the screw to be tensioned by a preset formula2And controlling the tensioning device to adopt the corrected construction axial force F2And tensioning the screw rod to be tensioned.
On the basis of the technical scheme, the preset formula is as follows:
ΔF1＝K*(t2-t3)
F2＝F1-ΔF0+ΔF1
in the formula,. DELTA.F1The actual loss of the axial force of the screw to be tensioned is obtained; k is a linear correlation coefficient of the propagation time of the ultrasonic signal in the screw to be tensioned and the internal axial force of the screw to be tensioned; f1Designing construction axial force for a screw to be tensioned; Δ F0The axial force is lost for the design of the screw to be tensioned.
On the basis of the technical scheme, the tensioning device and the ultrasonic detection device are respectively connected to two sides of the screw to be tensioned.
On the basis of the above technical scheme, the tensioning device includes:
the tensioning head is used for being fixed at one end of the screw rod to be tensioned;
the hydraulic oil pump is connected with the tensioning head and the control device, and the control device is used for controlling the hydraulic oil pump to drive the tensioning head to tension the screw rod to be tensioned.
On the basis of the above technical solution, the ultrasonic detection apparatus includes:
the ultrasonic probe is fixed at one end of the screw rod to be tensioned and used for transmitting an ultrasonic signal to one end of the screw rod to be tensioned and receiving a reflected signal of the ultrasonic signal reflected by the other end of the screw rod to be tensioned;
the ultrasonic excitation device is connected with the ultrasonic probe and is used for driving the ultrasonic probe to emit an ultrasonic signal;
the signal acquisition device, the signal acquisition device all links to each other with supersound exciting device and controlling means, controlling means is used for controlling signal acquisition device via supersound exciting device collection the ultrasonic signal of ultrasonic probe transmission to record emission time, and gather the reflection signal that ultrasonic probe received, and record the receipt time, finally obtain the propagation time that ultrasonic signal comes and goes once in treating stretch-draw screw.
On the basis of the technical scheme, the signal acquisition device comprises a signal conditioner and a data acquisition unit, the signal conditioner is connected with the data acquisition unit, the signal conditioner is used for transmitting the frequency of ultrasonic signals and reflected signals to the acquisition frequency of the data acquisition unit, the data acquisition unit is used for acquiring the ultrasonic signals after the frequency is transmitted, recording the transmitting time, acquiring the reflected signals after the frequency is transmitted, recording the receiving time, and finally obtaining the transmission time of the ultrasonic signals going back and forth in the screw rod to be tensioned.
On the basis of the technical scheme, the acquisition frequency of the data acquisition unit is 80 MHz.
On the basis of the technical scheme, the preset axial force is the design construction axial force F of the screw to be tensioned190% of the total.
The invention also provides a using method of the suspension bridge cable clamp screw axial force synchronous construction system, which comprises the following steps:
connecting a tensioning device with a screw to be tensioned;
connecting an ultrasonic detection device with a screw to be tensioned;
the control device controls the tensioning device to tension the screw rod to be tensioned to a first state by adopting a preset axial force, controls the ultrasonic detection device to emit an ultrasonic signal in the first state and obtains the propagation time t of the ultrasonic signal going back and forth once in the screw rod to be tensioned2；
The control device controls the tensioning device to unload the preset axial force so as to enable the screw to be tensioned to be in a second state, controls the ultrasonic detection device to emit an ultrasonic signal in the second state and obtains the propagation time t of the ultrasonic signal which makes one round trip in the screw to be tensioned3；
The control device being dependent on t2、t3And calculating the corrected construction axial force F in the screw to be tensioned by a preset formula2And controlling the tensioning device to adopt the corrected construction axial force F2And tensioning the screw rod to be tensioned.
On the basis of the technical scheme, the tensioning device and the ultrasonic detection device are respectively connected to two sides of the screw to be tensioned.
Compared with the prior art, the invention has the following advantages:
(1) the invention can automatically finish synchronous tensioning, and a correction scheme is made according to the retraction loss condition of a single tensioning screw, so that the engineering problems of large axial force loss and large randomness of the screw after the nut is pulled tight due to different roughness of the contact surfaces of the nut, the cushion block and the cable clamp structure and slight difference of screw thread processing conditions are properly solved.
(2) The construction system disclosed by the invention is simple in construction, does not provide higher machining precision requirements for the structures of the cable clamp and the screw, reduces manual operation and reduces construction errors.
(3) The invention can immediately check the axial force state of the screw after the screw is tensioned, and timely make a response scheme for the screw which does not meet the construction requirement, thereby avoiding the redraw working problem caused by the separation of the check and the construction, ensuring the construction quality and greatly saving the construction cost and the construction time.
Drawings
Fig. 1 is a schematic structural view of a suspension bridge cable clamp screw axial force synchronization construction system and screw connection according to an embodiment of the present invention.
Reference numerals: the device comprises a tensioning device 1, a tensioning head 11, a hydraulic oil pump 12, an ultrasonic detection device 2, an ultrasonic probe 21, an ultrasonic excitation device 22, a signal acquisition device 23, a control device 31, a control module 32, a calculation module and a screw rod to be tensioned 4.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1, an embodiment of the present invention provides a suspension bridge cable clamp screw axial force synchronization construction system, including: tensioning equipment 1, ultrasonic detection device 2, controlling means 3.
The tensioning device 1 is used for being connected with the screw rod 4 to be tensioned and tensioning the screw rod 4 to be tensioned; the ultrasonic detection device 2 is used for connecting with the screw rod 4 to be stretched, transmitting an ultrasonic signal into the screw rod 4 to be stretched and detectingThe propagation time of the ultrasonic signal going back and forth once in the screw 4 to be tensioned; the control device 3 is connected with the tensioning device 1 and the ultrasonic detection device 2 and is used for controlling the tensioning device 1 to adopt a preset axial force to tension the screw rod 4 to be tensioned to a first state, controlling the ultrasonic detection device 2 to emit an ultrasonic signal in the first state and acquiring the propagation time t of the ultrasonic signal which comes and goes once in the screw rod 4 to be tensioned2(ii) a The control device 3 is further used for controlling the tensioning device 1 to unload the preset axial force so as to enable the screw rod 4 to be tensioned to be in a second state, and controlling the ultrasonic detection device 2 to emit an ultrasonic signal and obtain the propagation time t of the ultrasonic signal in the screw rod 4 to be tensioned to and fro once in the second state3(ii) a The control means 3 are also arranged to be dependent on t2、t3And calculating the corrected construction axial force F in the screw rod 4 to be tensioned by a preset formula2And controlling the tensioning device 1 to correct the construction axial force F2And tensioning the screw rod 4 to be tensioned.
The invention can automatically finish synchronous tensioning, and a correction scheme is made according to the retraction loss condition of a single tensioning screw, so that the engineering problems of large axial force loss and large randomness of the screw after the nut is pulled tight due to different roughness of the contact surfaces of the nut, the cushion block and the cable clamp structure and slight difference of screw thread processing conditions are properly solved.
Wherein the preset axial force is the design construction axial force F of the screw rod 4 to be tensioned190% of; the first state is that the design construction axial force F is adopted1After 90 percent of the screw rods 4 to be tensioned are tensioned, the state of load is maintained; the second state is that the design construction axial force F is adopted1And after 90 percent of the screw rods 4 to be tensioned are tensioned, the state of the axial force is unloaded.
In this embodiment, preferably, the preset formula is as follows:
ΔF1＝K*t2-t3
F2＝F1-ΔF0+ΔF1
in the formula,. DELTA.F1The actual loss of the axial force of the screw rod 4 to be tensioned is obtained; k is the propagation time and the propagation time of the ultrasonic signal in the screw rod 4 to be tensionedLinear correlation coefficient of the internal axial force of the screw rod 4 to be tensioned; f2The axial force is constructed for correcting the screw rod 4 to be tensioned; f1Designing construction axial force for the screw rod 4 to be tensioned; Δ F0The axial forces are lost for the design of the screw 4 to be tensioned.
In this embodiment, preferably, the tensioning device 1 includes:
the tensioning head 11 is used for fixing one end of the screw rod 4 to be tensioned;
the hydraulic oil pump 12, the hydraulic oil pump 12 with the tensioning head 11 and controlling means 3 all link to each other, controlling means 3 is used for controlling hydraulic oil pump 12 drive tensioning head 11 and treats the tensioning screw 4 and stretch-draw.
The hydraulic oil pump 12 can output the same or different tension forces to the corresponding tensioning head 11 through an oil pressure pipeline, the loading process of the hydraulic oil pump 12 adopts servo control, the loading precision is 10KN, the output load range is 0-3000KN, and the loading time of the hydraulic oil pump 12 is adjustable.
The tensioning head 11 automatically finishes the nut screwing according to a set torque value, the set torque value is determined through test, and the torque for screwing out by considering the wrench force with the length of 1 meter for an adult is 500-800 N.m.
In this embodiment, it is preferable that the ultrasonic detection device 2 includes:
the ultrasonic probe 21 is fixed at one end of the screw rod 4 to be tensioned and used for transmitting an ultrasonic signal to one end of the screw rod 4 to be tensioned and receiving a reflected signal of the ultrasonic signal reflected by the other end of the screw rod 4 to be tensioned;
the ultrasonic excitation device 22 is connected with the ultrasonic probe 21, and is used for driving the ultrasonic probe 21 to emit an ultrasonic signal;
the signal acquisition device 23, the signal acquisition device 23 all links to each other with supersound exciting device 22 and controlling means 3, controlling means 3 is used for controlling signal acquisition device 23 to gather via supersound exciting device 22 the ultrasonic signal that ultrasonic probe 21 launched to record emission time, and gather the reflection signal that ultrasonic probe 21 received, and record the receipt time, finally obtain the propagation time that ultrasonic signal once comes and goes in treating stretch-draw screw 4.
In this embodiment, preferably, the signal acquisition device 23 includes a signal conditioner and a data acquisition unit, the signal conditioner is connected to the data acquisition unit, the signal conditioner is configured to transmit the frequencies of the ultrasonic signal and the reflected signal to the acquisition frequency of the data acquisition unit, the data acquisition unit is configured to acquire the ultrasonic signal after the frequency is transmitted and record the transmission time, acquire the reflected signal after the frequency is transmitted and record the reception time, and finally obtain the propagation time of the ultrasonic signal going back and forth once in the screw rod 4 to be tensioned; in order to improve the detection precision, the data acquisition unit adopts high-frequency acquisition, and in order to meet the acquisition frequency of the data acquisition unit, a signal conditioner is adopted to filter and transmit signals; further, the acquisition frequency of the data acquisition unit is 80 MHz.
The invention also provides a using method of the suspension bridge cable clamp screw axial force synchronous construction system, which comprises the following steps:
connecting the tensioning device 1 with a screw rod 4 to be tensioned;
connecting the ultrasonic detection device 2 with a screw rod 4 to be tensioned;
the control device 3 controls the tensioning device 1 to tension the screw rod 4 to be tensioned to a first state by adopting a preset axial force, controls the ultrasonic detection device 2 to emit an ultrasonic signal in the first state and obtains the propagation time t of the ultrasonic signal which comes and goes once in the screw rod 4 to be tensioned2；
The control device 3 controls the tensioning device 1 to unload the preset axial force so as to enable the screw rod 4 to be tensioned to be in a second state, controls the ultrasonic detection device 2 to emit an ultrasonic signal in the second state and obtains the propagation time t of the ultrasonic signal in the screw rod 4 to be tensioned to and fro once3；
The control device 3 is based on t2、t3And calculating the corrected construction axial force F in the screw rod 4 to be tensioned by a preset formula2And controlling the tensioning device 1 to correct the construction axial force F2And tensioning the screw rod 4 to be tensioned.
In this embodiment, preferably, the tensioning device 1 and the ultrasonic detection device 2 are respectively connected to two sides of the screw rod 4 to be tensioned.
The screw axial force construction method by adopting the suspension bridge cable clamp screw axial force synchronous construction system comprises the following steps:
a universal testing machine is adopted to carry out test calibration on the screw rod 4 to be stretched, and a linear correlation coefficient K of the propagation time of an ultrasonic signal in the screw rod 4 to be stretched and the internal axial force of the screw rod 4 to be stretched is obtained through linear fitting; the linear correlation coefficient K is entered into the calculation module 32;
before screw tensioning, the tensioning heads 11 are respectively fixed at one end of each screw 4 to be tensioned, and then the ultrasonic probes 21 are respectively fixed at the other end of each screw 4 to be tensioned; under the stress-free state, the initial propagation time of the ultrasonic signal in the screw rod 4 to be tensioned is t1；
The screw rod stretching is carried out in stages, and the first stage adopts design construction axial force F150% of the screws 4 to be tensioned are tensioned, the control module 31 outputs a command to the hydraulic oil pump 12, the load is output to the tensioning head 11 through an oil pressure pipeline, the tensioning head is in place and is subjected to load holding for 2min, and the tensioning head 11 automatically screws the nut for 15s at a set torque and then the hydraulic oil pump 12 returns oil and unloads;
second stage adopts design construction axial force F1Stretching 90% of the screw rod 4 to be stretched, outputting a command to the hydraulic oil pump 12 by the control module 31, outputting the load to the stretch-draw head 11 through an oil pressure pipeline, holding the load after stretching to the right position, outputting a command to the ultrasonic detection device 2 by the control module 31, and detecting the propagation time t of the ultrasonic signal in the screw rod 4 to be stretched by the signal acquisition device 232After 2min, the nut is automatically screwed by the tensioning head 11 with a set torque, after 15s, the hydraulic oil pump 12 returns oil and unloads, the control module 31 outputs an instruction to the ultrasonic detection device 2, and the signal acquisition device 23 detects the propagation time t of the ultrasonic signal in the screw rod 4 to be tensioned3；
The calculation module 32 calculates the actual loss axial force delta F of the screw rod 4 to be tensioned after the second stage of tensioning according to the data1：ΔF1＝K*t2-t3；
And design the construction axial force F1＝F0+ΔF0In which F is0To design the axial force,. DELTA.F0Loss of axial force for design;
thus, the construction axial force F is corrected2＝F1-ΔF0+ΔF1；
Tensioning device 1 for correcting construction axial forces F2Performing third-stage tensioning, outputting a command to the hydraulic oil pump 12 by the control module 31, outputting the load to the tensioning head 11 through an oil pressure pipeline, holding the load for 2min after tensioning in place, automatically screwing the nut 15s by the tensioning head 11 with a set torque, returning and unloading the oil of the hydraulic oil pump 12, outputting a command to the ultrasonic detection device 2 by the control module 31, and detecting the propagation time t of an ultrasonic signal in the screw rod 4 to be tensioned by the signal acquisition device 224；
The calculation module 32 calculates the internal axial force F' of the screw rod 4 to be tensioned after the third stage of tensioning according to the data: f' ═ K × t4-t1(ii) a And respectively comparing the required design axial force and outputting construction deviation.
The invention is illustrated in detail below by means of a specific example.
The screw in this embodiment is a high-strength screw designed to have a design axial force F0Design loss axial force Δ F, 750KN0Designing construction axial force F as 150KN1＝F0+ΔF0＝900KN。
The construction method specifically comprises the following steps:
a universal testing machine is adopted to carry out test calibration on the screw rod 4 to be stretched, a linear correlation coefficient K of the propagation time of an ultrasonic signal in the screw rod 4 to be stretched and the axial force in the screw rod 4 to be stretched is obtained through linear fitting, and the initial propagation time of the ultrasonic wave in the screw rod 4 to be stretched is t under a stress-free state1＝367.631μs；
Wherein, K is a first-order coefficient of 1-2 test pieces in the same screw rod calibrated on an experiment table, and K is 330.0.
To design the construction axial force F190% of the screws 4 to be stretched are stretched, namely 810KN, the nuts are tightened, and the propagation time t of the ultrasonic waves in the screws is measured2＝370.085μs；
After the axial force is unloaded, the ultrasonic signal is measured on the screw to be tensionedPropagation time t in the rod 43＝369.182μs；
Calculating the actual loss axial force delta F of the screw rod 4 to be tensioned1＝K*t2-t3Correcting construction axial force F as 297.99KN2＝F1-ΔF0+ΔF1＝1047.99KN；
To correct the construction axial force F2Tensioning the screw rod 4 to be tensioned, namely 1047.99KN, tightening the nut, and unloading the axial force to finish tensioning;
measuring the propagation time t of an ultrasonic signal in the screw 4 to be tensioned4The internal axial force F' ═ K (t) of the screw 4 to be tensioned is calculated in 369.927 μ s4-t1) Calculating the axial force F', i.e. 757.68KN, and the design axial force F when the calculated axial force F is 757.68KN0I.e. the deviation of 750KN, (757.68-750)/750 is 1.07%, i.e. the axial force F' after the completion of the tensioning in the screw rod 4 to be tensioned and the design axial force F0Compared with the prior art, the size of the concrete is larger by 1.07 percent and within the range of 5 percent, and the construction is qualified.
The following is a construction data table of a plurality of screws in the same batch:
when the screw rods 4 to be tensioned are tensioned, a plurality of screw rods 4 to be tensioned on the cable clamp are synchronously constructed. Therefore, compared with the designed axial force, the errors of the axial force of the plurality of screws 4 to be tensioned are within 5 percent, and the synchronous construction system meets the construction standard.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (9)
1. The utility model provides a suspension bridge cable clamp screw rod axial force synchronization construction system which characterized in that includes:
the tensioning device (1) is connected with the screw rod (4) to be tensioned and used for tensioning the screw rod (4) to be tensioned;
the ultrasonic detection device (2) is connected with the screw rod (4) to be tensioned, transmits an ultrasonic signal into the screw rod (4) to be tensioned, and detects the propagation time of the ultrasonic signal in the screw rod (4) to be tensioned;
control device (3), control device (3) with tensioning device (1) and ultrasonic detection device (2) all link to each other, and it is used for controlling tensioning device (1) to adopt and predetermine the axial force will treat tensioning screw (4) stretch-draw to first state, and control ultrasonic detection device (2) transmission ultrasonic signal under the first state and acquire this ultrasonic signal and wait to stretch out the propagation time t that comes and goes once in tensioning screw (4)2(ii) a The control device (3) is also used for controlling the tensioning device (1) to unload the preset axial force so as to enable the screw rod (4) to be tensioned to be in a second state, and controlling the ultrasonic detection device (2) to emit an ultrasonic signal and obtain the propagation time t of the ultrasonic signal which comes and goes once in the screw rod (4) to be tensioned under the second state3(ii) a The control device (3) is also used for controlling the power supply according to t2、t3And a preset formula is used for calculating the corrected construction axial force F in the screw rod (4) to be tensioned2And controlling the tensioning device (1) to correct the construction axial force F2Tensioning the screw rod (4) to be tensioned;
the preset formula is as follows:
ΔF1＝K*(t2-t3)；
F2＝F1-ΔF0+ΔF1；
in the formula,. DELTA.F1The actual loss of the axial force of the screw (4) to be tensioned is obtained; k is a linear correlation coefficient of the propagation time of the ultrasonic signal in the screw rod (4) to be tensioned and the axial force in the screw rod (4) to be tensioned; f1For screws (4) to be tensionedDesigning construction axial force; Δ F0The axial force is lost for the design of the screw (4) to be tensioned.
2. The suspension bridge cable clamp screw axial force synchronous construction system according to claim 1, characterized in that: the tensioning device (1) and the ultrasonic detection device (2) are respectively connected to two sides of the screw rod (4) to be tensioned.
3. The suspension bridge cable clamp screw axial force synchronous construction system according to claim 1, wherein the tension device (1) comprises:
the tensioning head (11) is used for being fixed at one end of the screw rod (4) to be tensioned;
the tensioning device comprises a hydraulic oil pump (12), wherein the hydraulic oil pump (12) is connected with the tensioning head (11) and a control device (3), and the control device (3) is used for controlling the hydraulic oil pump (12) to drive the tensioning head (11) to tension the tensioning screw (4).
4. The suspension bridge cable clamp screw axial force synchronous construction system according to claim 1, wherein the ultrasonic detection device (2) comprises:
the ultrasonic probe (21) is fixed at one end of the screw rod (4) to be tensioned and used for transmitting an ultrasonic signal to one end of the screw rod (4) to be tensioned and receiving a reflected signal of the ultrasonic signal reflected by the other end of the screw rod (4) to be tensioned;
the ultrasonic excitation device (22), the ultrasonic excitation device (22) is connected with the ultrasonic probe (21), and is used for driving the ultrasonic probe (21) to emit an ultrasonic signal;
signal acquisition device (23), signal acquisition device (23) all link to each other with supersound exciting means (22) and controlling means (3), controlling means (3) are used for controlling signal acquisition device (23) to gather via supersound exciting means (22) the ultrasonic signal that ultrasonic probe (21) launched to the recording emission time, and gather the reflection signal that ultrasonic probe (21) received, and the recording reception time, finally obtain the propagation time that ultrasonic signal comes and goes once in treating stretch-draw screw (4).
5. The suspension bridge cable clamp screw axial force synchronous construction system according to claim 4, characterized in that: the signal acquisition device (23) comprises a signal conditioner and a data acquisition unit, the signal conditioner is connected with the data acquisition unit, the signal conditioner is used for transmitting the frequency of ultrasonic signals and reflected signals to the acquisition frequency of the data acquisition unit, the data acquisition unit is used for acquiring the ultrasonic signals after the frequency is transmitted, recording the transmission time, acquiring the reflected signals after the frequency is transmitted, recording the receiving time and finally obtaining the transmission time of the ultrasonic signals which come and go once in the screw rod (4) to be tensioned.
6. The suspension bridge cable clamp screw axial force synchronous construction system according to claim 5, characterized in that: the acquisition frequency of the data acquisition unit is 80 MHz.
7. The suspension bridge cable clamp screw axial force synchronous construction system according to claim 1, characterized in that: the preset axial force is the design construction axial force F of the screw (4) to be tensioned190% of the total.
8. Use method of the suspension bridge cable clamp screw axial force synchronous construction system according to any one of claims 1 to 7, characterized by comprising the following steps:
connecting the tensioning device (1) with a screw (4) to be tensioned;
connecting an ultrasonic detection device (2) with a screw (4) to be tensioned;
the control device (3) controls the tensioning device (1) to tension the screw rod (4) to be tensioned to a first state by adopting a preset axial force, controls the ultrasonic detection device (2) to emit an ultrasonic signal in the first state and obtains the propagation time t of the ultrasonic signal which returns once in the screw rod (4) to be tensioned2；
The control device (3) controls the tensioning device (1) to unload the preset axial force so that the screw (4) to be tensioned is in the second state, controls the ultrasonic detection device (2) to emit an ultrasonic signal and obtains the ultrasonic signal to move in the screw (4) to be tensioned in the second statePropagation time t of the return3；
The control device (3) is based on t2、t3And a preset formula is used for calculating the corrected construction axial force F in the screw rod (4) to be tensioned2And controlling the tensioning device (1) to correct the construction axial force F2And tensioning the screw rod (4) to be tensioned.
9. Use according to claim 8, characterized in that: the tensioning device (1) and the ultrasonic detection device (2) are respectively connected to two sides of the screw rod (4) to be tensioned.
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| CN110374003B true CN110374003B (en) | 2021-04-27 |
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| CN111535195B (en) * | 2020-05-18 | 2024-10-11 | 中铁大桥科学研究院有限公司 | Tensioning method for suspension bridge cable clamp screw |
| CN111623910B (en) * | 2020-05-25 | 2021-08-06 | 中铁大桥科学研究院有限公司 | Suspension bridge cable clamp screw axial force identification method based on ultrasonic echo envelope modeling |
| CN112227208B (en) * | 2020-09-23 | 2022-03-29 | 中铁大桥局集团有限公司 | Monitoring and forecasting method for construction period and operation period of suspension bridge cable clamp screw |
| CN112033602A (en) * | 2020-09-24 | 2020-12-04 | 罗治军 | High-strength bolt ultrasonic axial force coefficient field calibration system |
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