CN113309154A - Intelligent sensing joint and method for stress of precast tubular pile - Google Patents
Intelligent sensing joint and method for stress of precast tubular pile Download PDFInfo
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- CN113309154A CN113309154A CN202110615920.4A CN202110615920A CN113309154A CN 113309154 A CN113309154 A CN 113309154A CN 202110615920 A CN202110615920 A CN 202110615920A CN 113309154 A CN113309154 A CN 113309154A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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Abstract
A prefabricated pipe pile stress intelligent sensing joint and a method are provided, wherein the joint comprises: the upper end plate and the lower end plate are fixedly connected with the upper end and the lower end of the outer circular plate; the inner circular plate is coaxially arranged inside the outer circular plate; the upper connecting insertion pipe and the lower connecting insertion pipe are respectively fixedly inserted into an upper mounting hole of the upper end plate and a lower mounting hole of the lower end plate; the four strain/tilt angle sensors are annularly and uniformly distributed on the inner side surface of the outer circular plate. The method comprises the following steps: connecting the intelligent sensing connector for the stress of the precast tubular pile between two pile sections which are distributed up and down; acquiring a strain value and an inclination angle through a strain/inclination angle sensor; and calculating the axial force, the bending moment and the inclination angle of the stressed intelligent sensing joint of the precast tubular pile. The sensing joint can be used for conveniently monitoring the stress and posture information of the tubular pile in real time, can be used for conveniently guiding the construction process of the pile foundation and can ensure the safety factor of subsequent operation. The method has simple steps and low monitoring cost, and can be used for conveniently realizing dynamic monitoring of stress and attitude information such as axial force, bending moment, verticality and the like of the pile body at the corresponding position.
Description
Technical Field
The invention belongs to the technical field of pipe pile monitoring, and particularly relates to a prefabricated pipe pile stress intelligent sensing joint and a method.
Background
The pipe pile serving as a foundation treatment method and a pile foundation form which are widely applied has the advantages of short construction period, convenience in construction, convenience in industrial production, no pollution to a construction site, considerable economic benefit, strong adaptability and the like. At the present stage, the pipe piles used for the foundation are usually formed by pouring reinforced concrete, construction quality problems such as pipe pile breakage or deflection can be caused due to improper operation or influence of soil layer property difference and the like in the construction process, and if the pipe piles cannot be found timely after stress change or posture deflection, the risk of subsequent construction operation can be increased, and the exertion of the bearing capacity of the pile foundation is influenced.
In the prior art, the stress and posture information of the tubular pile is not effectively monitored, especially the control and control of the construction quality of the tubular pile in the construction process are not needed, so that the construction can not be guided in real time, and the construction quality of the pile foundation and the use safety of subsequent building structures are ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the intelligent sensing joint and the intelligent sensing method for the stress of the precast tubular pile. The method has simple steps and low monitoring cost, and can be used for conveniently realizing dynamic monitoring of stress and attitude information such as axial force, bending moment, verticality and the like of the pile body at the corresponding position.
In order to achieve the purpose, the invention provides an intelligent sensing joint for stress of a precast tubular pile, which comprises an outer circular plate, an upper end plate, a lower end plate, an inner circular plate, an upper connecting insertion pipe, a lower connecting insertion pipe, a first strain/inclination angle sensor, a second strain/inclination angle sensor, a third strain/inclination angle sensor and a fourth strain/inclination angle sensor; the outer diameter of the outer circular plate is matched with the size of the tubular pile;
the upper end plate and the lower end plate are horizontally arranged and are circular, the outer diameters of the upper end plate and the lower end plate are the same as the outer diameter of the outer circular plate, an upper mounting hole matched with the tubular pile hole is formed in the center of the upper end plate and is fixedly connected to the upper end of the outer circular plate in a coaxial manner, a lower mounting hole matched with the tubular pile hole is formed in the center of the lower end plate and is fixedly connected to the lower end of the outer circular plate in a coaxial manner;
the inner circular plate is coaxially arranged inside the outer circular plate, the upper end of the inner circular plate is fixedly connected with the lower end face of the upper end plate, and the lower end of the inner circular plate is fixedly connected with the upper end face of the lower end plate;
the upper connecting insertion pipe is vertically arranged, the outer diameter of the upper connecting insertion pipe is the same as the aperture of the upper mounting hole, and the lower end of the upper connecting insertion pipe is fixedly inserted into the upper mounting hole; the lower connecting insertion pipe is vertically arranged, the outer diameter of the lower connecting insertion pipe is the same as the aperture of the lower mounting hole, and the upper end of the lower connecting insertion pipe is fixedly inserted into the lower mounting hole;
the first strain/inclination angle sensor, the second strain/inclination angle sensor, the third strain/inclination angle sensor and the fourth strain/inclination angle sensor are circumferentially and uniformly distributed on the inner side surface of the outer circular plate in a left-right circumferential direction and are connected with the inner surface of the outer circular plate in a fitting manner.
Furthermore, in order to increase the intelligent degree of the sensing joint and facilitate power supply, the sensing joint further comprises a storage battery pack and a data acquisition module, wherein the storage battery pack and the data acquisition module are arranged in the space between the upper end plate, the lower end plate and the outer circular plate, and the data acquisition module is respectively connected with the storage battery pack, the first strain/inclination angle sensor, the second strain/inclination angle sensor, the third strain/inclination angle sensor and the fourth strain/inclination angle sensor.
Furthermore, in order to realize automatic measurement, the system also comprises a computer, and the computer is connected with the data acquisition module.
Furthermore, in order to increase the connection strength, the lower end of the upper connection insertion pipe extends to the lower part of the upper end plate, and is fixedly connected with the lower end face of the upper end plate through a plurality of upper connection rib plates which are annularly distributed on the outer side of the upper connection insertion pipe; the lower end of the lower connecting insertion pipe extends to the lower part of the lower end plate, and is fixedly connected with the upper end face of the lower end plate through a plurality of lower connecting rib plates which are distributed on the outer side of the lower connecting insertion pipe in the circumferential direction.
Preferably, the storage battery pack is a lithium battery pack.
Preferably, the upper and lower connecting cannulas are of the same size and dimensions.
Preferably, the number of the upper connecting rib plate and the number of the lower connecting rib plate are four.
According to the invention, the outer circular plate and the inner circular plate are coaxially and fixedly connected between the upper end plate and the lower end plate, so that the sensing joint has good bearing strength, meanwhile, a bearing space can be formed, and a sensor can be conveniently arranged on the inner side surface of the outer circular plate; the upper connecting insertion pipe is installed at the center of the upper end plate, the lower connecting insertion pipe is installed at the center of the lower end plate, two adjacent pile sections can be conveniently connected, and the effects of auxiliary installation and joint reinforcement can be achieved. The sensing joint can be used for conveniently monitoring the stress and posture information of the tubular pile in real time, can be used for conveniently guiding the construction process of the pile foundation and can ensure the safety factor of subsequent operation.
The invention also provides an intelligent sensing method for the stress of the precast tubular pile, which comprises an intelligent sensing joint for the stress of the precast tubular pile and comprises the following steps:
the method comprises the following steps: the intelligent sensing connector for the stress of the prefabricated tubular pile is arranged between two pile sections which are distributed up and down, an upper connecting insertion pipe is fixedly inserted into a pile hole of the upper pile section, a bottom plate of the upper pile section is fixedly connected with an upper end plate in an attached mode, a lower connecting insertion pipe is fixedly inserted into a pile hole of the lower pile section, and a top plate of the lower pile section is fixedly connected with a lower end plate in an attached mode;
step two: the data acquisition module acquires a strain value epsilon on the left side of the outer circular plate through a strain/tilt angle sensor Ix1Acquiring the strain value epsilon on the right side of the outer circular plate in real time through a strain/tilt angle sensor IIx2Acquiring the strain value epsilon of the front side of the outer circular plate in real time through a strain/tilt angle sensory1Acquiring the strain value epsilon of the rear side of the outer circular plate in real time through the strain/tilt angle sensor IVy2(ii) a Acquiring the inclination angle theta of the outer circular plate in the x direction in real time through a strain/inclination angle sensor I or a strain/inclination angle sensor IIx(ii) a Acquiring the inclination angle theta of the outer circular plate in the y direction in real time through a strain/inclination sensor III or a strain/inclination sensor IVy；
Step three: calculating the axial force N of the stressed intelligent sensing joint of the precast tubular pile according to the formula (1);
N＝εN·E (1)；
in the formula, epsilonNFor the actual measurement strain value of the intelligent sensing joint of the stress of the precast tubular pile, the strain value is taken
E is the elastic modulus of the intelligent sensing joint for the stress of the precast tubular pile;
calculating the bending moment M of the prefabricated pipe pile in the x direction of the stress intelligent sensing joint according to the formula (2)x(ii) a Calculating the bending moment M of the precast tubular pile in the y direction of the stress intelligent sensing joint according to the formula (3)y；
Mx＝εMx·E·W (2)；
My＝εMy·E·W (3)；
In the formula, epsilonMxFor the intelligent sensing joint of the stress of the precast tubular pileDifference in strain in x direction, epsilonMx＝εx1-εx2；εMyFor the stress intelligent perception of the precast tubular pile in the y direction of the strain difference, epsilonMy＝εy1-εy2(ii) a W is the bending section coefficient of the intelligent sensing joint for the stress of the precast tubular pile;
calculating the inclination angle theta of the intelligent sensing joint for the stress of the precast tubular pile according to a formula (4);
step four: according to the axial force N of the intelligent sensing joint for the stress of the precast tubular pile and the bending moment M in the x direction of the intelligent sensing joint for the stress of the precast tubular pilexBending moment M of y-direction of prefabricated pipe pile stress intelligent sensing jointyAnalyzing the inclination angle theta of the prefabricated pipe pile stress intelligent sensing joint and determining the whole stress and posture information of the pipe pile; in the pile group foundation, the comprehensive evaluation of the construction quality and the service performance of the pile group foundation can be realized based on the pile forming stress and attitude analysis of a plurality of foundation piles.
The method has simple steps and low monitoring cost, can conveniently realize dynamic monitoring of stress and attitude information such as axial force, bending moment, verticality and the like of the pile body at the corresponding position, can guide the construction of the precast pile foundation in real time, improves the control on the construction quality of the precast pile, and can ensure the safety coefficient of subsequent operation.
Drawings
FIG. 1 is a schematic view of the assembly of the present invention with a pile section;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic view of the assembly of the present invention among a plurality of pile sections;
fig. 4 is a schematic diagram of the calculation of the stress intelligent sensing joint inclination angle of the precast tubular pile.
In the figure: 1. the device comprises a pile section, 2, a computer, 3, an upper connecting insertion pipe, 4, a lower connecting insertion pipe, 5-1, an upper end plate, 5-2, a lower end plate, 6-1, a first strain/inclination angle sensor, 6-2, a second strain/inclination angle sensor, 6-3, a third strain/inclination angle sensor, 6-4, a fourth strain/inclination angle sensor, 7, an inner circular plate, 8, an outer circular plate, 9, a data acquisition module, 10, a storage battery pack, 11, an upper connecting rib plate, 12 and a lower connecting rib plate.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 to 3, the intelligent sensing joint for stress of the precast tubular pile comprises an outer circular plate 8, an upper end plate 5-1, a lower end plate 5-2, an inner circular plate 7, an upper connecting insertion tube 3, a lower connecting insertion tube 4, a first strain/inclination angle sensor 6-1, a second strain/inclination angle sensor 6-2, a third strain/inclination angle sensor 6-3 and a fourth strain/inclination angle sensor 6-4; the outer diameter of the outer circular plate 8 is matched with the size of the tubular pile;
the upper end plate 5-1 and the lower end plate 5-2 are horizontally arranged, are circular, and have the same outer diameter as the outer circular ring plate 8, an upper mounting hole matched with the tubular pile hole is formed in the center of the upper end plate 5-1 and is fixedly connected to the upper end of the outer circular ring plate 8 in a coaxial manner, a lower mounting hole matched with the tubular pile hole is formed in the center of the lower end plate 5-2 and is fixedly connected to the lower end of the outer circular ring plate 8 in a coaxial manner;
the inner circular plate 7 is coaxially arranged inside the outer circular plate 8, the upper end of the inner circular plate is fixedly connected with the lower end face of the upper end plate 5-1, and the lower end of the inner circular plate is fixedly connected with the upper end face of the lower end plate 5-2; preferably, the plate body of the inner circular plate 7 is provided with a wire passing hole to facilitate the passing of a cable.
The upper connecting insertion pipe 3 is vertically arranged, the outer diameter of the upper connecting insertion pipe is the same as the aperture of the upper mounting hole, and the lower end of the upper connecting insertion pipe is fixedly inserted into the upper mounting hole; the lower connecting insertion pipe 4 is vertically arranged, the outer diameter of the lower connecting insertion pipe is the same as the aperture of the lower mounting hole, and the upper end of the lower connecting insertion pipe is fixedly inserted into the lower mounting hole;
the first strain/inclination angle sensor 6-1, the second strain/inclination angle sensor 6-2, the third strain/inclination angle sensor 6-3 and the fourth strain/inclination angle sensor 6-4 are circumferentially and uniformly distributed on the inner side surface of the outer circular plate from left to right and are in fit connection with the inner surface of the outer circular plate.
In order to realize automatic measurement, the system further comprises a computer 2, and the computer 2 is connected with a data acquisition module 9. Preferably, the computer 2 is located on the ground.
As an optimization, the size of the intelligent force sensing joint of the precast tubular pile can be adapted according to the size of the precast tubular pile for specific application, the outer diameter of the outer circular plate 8 is consistent with the outer diameter of the precast tubular pile, the inner diameters of the upper and lower connecting insertion pipes and the pile hole of the precast tubular pile are consistent, and the height of the outer circular plate 8 is adapted to the type of the sensor. Wherein, two sections of precast pile sections which are close to are respectively welded with the upper end plate and the lower end plate of the intelligent sensing joint for the stress of the precast tubular pile, and the welding strength is not lower than the internode connection requirement of the original precast tubular pile. The upper and lower connecting insertion pipes 3 and 4 are inserted into the stress sensing joint and play a role in assisting installation and joint reinforcement. The strain/tilt angle sensor and the inner side of the outer circular plate can be welded, adhered or connected through a connecting piece and the like. The strain/tilt angle sensor and the data acquisition module 9, and the data acquisition module 9 and the ground computer 2 can be connected through shielded cables.
In order to increase the intelligent degree of the sensing connector and facilitate power supply, the sensing connector further comprises a storage battery pack 10 and a data acquisition module 9, wherein the storage battery pack 10 and the data acquisition module 9 are installed in a space between the upper end plate 5-1, the lower end plate 5-2 and the outer circular plate 8, and the data acquisition module 9 is respectively connected with the storage battery pack 10, the strain/inclination angle sensor I6-1, the strain/inclination angle sensor II 6-2, the strain/inclination angle sensor III 6-3 and the strain/inclination angle sensor IV 6-4.
In order to increase the connection strength, the lower end of the upper connecting insertion pipe 3 extends to the lower part of the upper end plate 5-1, and is fixedly connected with the lower end face of the upper end plate 5-1 through a plurality of upper connecting rib plates 11 which are annularly distributed on the outer side of the upper connecting insertion pipe 3; the lower end of the lower connecting insertion pipe 4 extends to the lower part of the lower end plate 5-2, and is fixedly connected with the upper end face of the lower end plate 5-2 through a plurality of lower connecting rib plates 12 which are annularly distributed on the outer side of the lower connecting insertion pipe 4.
Preferably, the battery pack 10 is a lithium battery pack.
Preferably, the upper connecting cannula 3 and the lower connecting cannula 4 are of the same size and dimensions.
Preferably, the number of the upper connecting rib plate 11 and the lower connecting rib plate 12 is four.
The sensing joint has good bearing strength by fixedly connecting the outer circular plate and the inner circular plate with the same axle center between the upper end plate and the lower end plate, and meanwhile, a bearing space can be formed, so that the sensor can be conveniently arranged on the inner side surface of the outer circular plate; the upper connecting insertion pipe is installed at the center of the upper end plate, the lower connecting insertion pipe is installed at the center of the lower end plate, two adjacent pile sections can be conveniently connected, and the effects of auxiliary installation and joint reinforcement can be achieved. The sensing joint can be used for conveniently monitoring the stress and posture information of the tubular pile in real time, can be used for conveniently guiding the construction process of the pile foundation and can ensure the safety factor of subsequent operation.
In general engineering, a precast pile can be divided into a plurality of sections of pile sections to be prefabricated in a factory, and after the precast pile is transported to a site, lengthening operation is carried out in the pile sinking process. This perception connects can regard as the optional assembly spare of precast pile, when carrying out the needs that monitor to the precast pile atress, can install the setting at the job site precast pile internode, and its convenient use, the installation is convenient. The method and the device can realize monitoring of stress and attitude information of various precast piles, and have wide application prospect.
The invention also provides an intelligent sensing method for the stress of the precast tubular pile, which comprises an intelligent sensing joint for the stress of the precast tubular pile and is characterized by comprising the following steps of:
the method comprises the following steps: the intelligent sensing connector for the stress of the precast tubular pile is arranged between two pile sections 1 which are distributed up and down, an upper connecting insertion pipe 3 is fixedly inserted into a pile hole of the upper pile section 1, a bottom plate of the upper pile section 1 is fixedly connected with an upper end plate 5-1 in an attached manner, a lower connecting insertion pipe 4 is fixedly inserted into a pile hole of the lower pile section 1, and a top plate of the lower pile section 1 is fixedly connected with a lower end plate 5-2 in an attached manner;
step two: the data acquisition module 9 acquires a strain value epsilon on the left side of the outer circular plate 8 through the strain/tilt angle sensor I6-1x1Acquiring a strain value epsilon on the right side of the outer circular plate 8 in real time through a strain/tilt angle sensor II 6-2x2Through strain/tilt sensor III6-3 real-time acquisition of strain value epsilon of front side of outer circular plate 8y1Acquiring a strain value epsilon of the rear side of the outer circular plate 8 in real time through four 6-4 strain/tilt angle sensorsy2(ii) a The inclination angle theta of the outer circular plate 8 in the x direction is acquired in real time through the first strain/inclination angle sensor 6-1 or the second strain/inclination angle sensor 6-2x(ii) a The inclination angle theta of the outer circular plate 8 in the y direction is acquired in real time through a third strain/inclination sensor 6-3 or a fourth strain/inclination sensor 6-4y；
Step three: calculating the axial force N of the stressed intelligent sensing joint of the precast tubular pile according to the formula (1);
N＝εN·E (1)；
in the formula, epsilonNFor the actual measurement strain value of the intelligent sensing joint of the stress of the precast tubular pile, the strain value is taken
E is the elastic modulus of the intelligent sensing joint for the stress of the precast tubular pile, which can be obtained by calibration in the manufacturing process;
calculating the bending moment M of the prefabricated pipe pile in the x direction of the stress intelligent sensing joint according to the formula (2)x(ii) a Calculating the bending moment M of the precast tubular pile in the y direction of the stress intelligent sensing joint according to the formula (3)y；
Mx＝εMx·E·W (2)；
My＝εMy·E·W (3)；
In the formula, epsilonMxFor the intelligent sensing of the stress difference value epsilon of the prefabricated pipe pile in the x directionMx＝εx1-εx2；εMyFor the stress intelligent perception of the precast tubular pile in the y direction of the strain difference, epsilonMy＝εy1-εy2(ii) a W is the bending section coefficient of the intelligent sensing joint for the stress of the precast tubular pile, and the bending section coefficient can be obtained by calculation according to the actual section specification;
calculating the inclination angle theta of the intelligent sensing joint for the stress of the precast tubular pile according to a formula (4);
because the angle of inclination is not very large, i.e. thetaxAnd thetayBoth are at two smaller angles, as shown in fig. 4, and there is a quadrant with the pile section facing either direction
Namely, it is
Here, θ ranges from (0,90 °).
Now, if the length of the pile section is L and the pile section is inclined towards the I-th quadrant of the horizontal plane, the length is thetax∈(0,90°)，tanθx∈(0,+∞)；θy∈(0,90°)，tanθy∈(0,+∞)，
At this time
Alpha is (0 degree, 90 degrees);
now, if the pile section is inclined towards the second quadrant of the horizontal plane, the angle theta isx∈(90°，180°)，tanθx∈(-∞,0)；θy∈(0,90°)，tanθy∈(0,+∞)
At this time
Alpha is (90 degrees, 180 degrees);
now, if the pile section is inclined towards the III-th quadrant of the horizontal plane, the angle theta is equal tox∈(90°，180°)，tanθx∈(-∞,0)；θy∈(90°，180°)，tanθy∈(-∞,0)
At this time
Alpha is (180 degrees, 270 degrees);
now, if the pile section is inclined towards the IV quadrant of the horizontal plane, the angle theta isx∈(0°,90°)，tanθx∈(0,+∞)；θy∈(90°，180°)，tanθy∈(-∞,0)
At this time
Alpha is (270 degrees, 360 degrees);
to sum up, the included angle between the pile section inclination and the specified + x direction is alpha, and
the difference lies in that:
if thetax∈(0,90°)，θyE, is (0,90 degrees), then alpha is taken as (0 degrees, 90 degrees);
if thetax∈(90°，180°)，θyE, is (0,90 degrees), then alpha is (90 degrees, 180 degrees);
if thetax∈(90°，180°)，θyE (90 degrees and 180 degrees), then alpha is taken as (180 degrees and 270 degrees);
if thetax∈(0°,90°)，θyE (90 degrees and 180 degrees), then alpha is taken as (180 degrees and 270 degrees);
step four: according to the axial force N of the intelligent sensing joint for the stress of the precast tubular pile and the bending moment M in the x direction of the intelligent sensing joint for the stress of the precast tubular pilexBending moment M of y-direction of prefabricated pipe pile stress intelligent sensing jointyAnd analyzing the inclination angle theta of the prefabricated pipe pile stress intelligent sensing joint and determining the stress and posture information of the pipe pile. In the pile group foundation, the comprehensive evaluation of the construction quality and the service performance of the pile group foundation can be realized based on the pile forming stress and attitude analysis of a plurality of foundation piles.
The method has simple steps and low monitoring cost, can conveniently realize dynamic monitoring of stress and attitude information such as axial force, bending moment, verticality and the like of the pile body at the corresponding position, can guide the construction of the precast pile foundation in real time, improves the control on the construction quality of the precast pile, and can ensure the safety coefficient of subsequent operation.
Claims (8)
1. The intelligent sensing joint for the stress of the prefabricated pipe pile comprises an outer circular plate (8), wherein the outer diameter of the outer circular plate (8) is matched with the size of the pipe pile, and the intelligent sensing joint is characterized by further comprising an upper end plate (5-1), a lower end plate (5-2), an inner circular plate (7), an upper connecting insertion pipe (3), a lower connecting insertion pipe (4), a first strain/dip angle sensor (6-1), a second strain/dip angle sensor (6-2), a third strain/dip angle sensor (6-3) and a fourth strain/dip angle sensor (6-4);
the upper end plate (5-1) and the lower end plate (5-2) are horizontally arranged, are circular, and have the same outer diameter as that of the outer circular plate (8), an upper mounting hole matched with the tubular pile hole is formed in the center of the upper end plate (5-1) and is fixedly connected to the upper end of the outer circular plate (8) in the same axis, a lower mounting hole matched with the tubular pile hole is formed in the center of the lower end plate (5-2) and is fixedly connected to the lower end of the outer circular plate (8) in the same axis;
the inner circular plate (7) is coaxially arranged inside the outer circular plate (8), the upper end of the inner circular plate is fixedly connected with the lower end face of the upper end plate (5-1), and the lower end of the inner circular plate is fixedly connected with the upper end face of the lower end plate (5-2);
the upper connecting insertion pipe (3) is vertically arranged, the outer diameter of the upper connecting insertion pipe is the same as the aperture of the upper mounting hole, and the lower end of the upper connecting insertion pipe is fixedly inserted into the upper mounting hole; the lower connecting insertion pipe (4) is vertically arranged, the outer diameter of the lower connecting insertion pipe is the same as the aperture of the lower mounting hole, and the upper end of the lower connecting insertion pipe is fixedly inserted into the lower mounting hole;
the strain/inclination angle sensor I (6-1), the strain/inclination angle sensor II (6-2), the strain/inclination angle sensor III (6-3) and the strain/inclination angle sensor IV (6-4) are circumferentially and uniformly distributed on the inner side surface of the outer circular plate (8) from left to right and from front to back, and are connected with the inner surface of the outer circular plate (8) in an attaching mode.
2. The intelligent sensing connector for stress of the precast tubular pile according to claim 1 is characterized by further comprising a storage battery pack (10) and a data acquisition module (9), wherein the storage battery pack (10) and the data acquisition module (9) are installed in a space between the upper end plate (5-1), the lower end plate (5-2) and the outer circular plate (8), and the data acquisition module (9) is respectively connected with the storage battery pack (10), the first strain/inclination angle sensor (6-1), the second strain/inclination angle sensor (6-2), the third strain/inclination angle sensor (6-3) and the fourth strain/inclination angle sensor (6-4).
3. The intelligent sensing joint for stress of the precast tubular pile according to claim 2, further comprising a computer (2), wherein the computer (2) is connected with the data acquisition module (9).
4. The intelligent sensing joint for stress of the precast tubular pile according to any one of claims 1 to 3, wherein the lower end of the upper connecting insertion pipe (3) extends to the lower part of the upper end plate (5-1), and is fixedly connected with the lower end surface of the upper end plate (5-1) through a plurality of upper connecting rib plates (11) annularly distributed on the outer side of the upper connecting insertion pipe (3); the lower end of the lower connecting insertion pipe (4) extends to the lower part of the lower end plate (5-2), and is fixedly connected with the upper end face of the lower end plate (5-2) through a plurality of lower connecting rib plates (12) which are annularly distributed on the outer side of the lower connecting insertion pipe (4).
5. The intelligent force sensing connector for the precast tubular pile according to claim 2, wherein the storage battery pack (10) is a lithium battery pack.
6. The intelligent force sensing joint for the precast tubular pile according to claim 4, wherein the upper connecting insertion tube (3) and the lower connecting insertion tube (4) are the same in type and size.
7. The intelligent sensing joint for stress of the precast tubular pile according to claim 4, wherein the number of the upper connecting rib plates (11) and the number of the lower connecting rib plates (12) are four.
8. An intelligent sensing method for stress of a precast tubular pile, comprising the intelligent sensing joint for stress of the precast tubular pile as claimed in claims 1 to 7, and being characterized by comprising the following steps:
the method comprises the following steps: the intelligent sensing connector for the stress of the precast tubular pile is arranged between two pile sections (1) which are distributed up and down, an upper connecting insertion pipe (3) is fixedly inserted into a pile hole of the upper pile section (1), a bottom plate of the upper pile section (1) is fixedly connected with an upper end plate (5-1) in a fitting manner, a lower connecting insertion pipe (4) is fixedly inserted into a pile hole of the lower pile section (1), and a top plate of the lower pile section (1) is fixedly connected with a lower end plate (5-2) in a fitting manner;
step two: the data acquisition module (9) acquires a strain value epsilon on the left side of the outer circular plate (8) through the strain/inclination angle sensor I (6-1)x1Acquiring a strain value epsilon on the right side of the outer circular plate (8) in real time through a strain/tilt angle sensor II (6-2)x2Acquiring a strain value epsilon of the front side of the outer circular plate (8) in real time through a strain/tilt angle sensor III (6-3)y1Acquiring a strain value epsilon of the rear side of the outer circular plate (8) in real time through a strain/tilt angle sensor IV (6-4)y2(ii) a The inclination angle theta of the outer circular plate (8) in the x direction is acquired in real time through the first strain/inclination angle sensor (6-1) or the second strain/inclination angle sensor (6-2)x(ii) a The inclination angle theta of the outer circular plate (8) in the y direction is acquired in real time through a strain/inclination angle sensor III (6-3) or a strain/inclination angle sensor IV (6-4)y；
Step three: calculating the axial force N of the stressed intelligent sensing joint of the precast tubular pile according to the formula (1);
N＝εN·E (1)；
in the formula, epsilonNFor the actual measurement strain value of the intelligent sensing joint of the stress of the precast tubular pile, the strain value is taken
E is the elastic modulus of the intelligent sensing joint for the stress of the precast tubular pile;
calculating the bending moment M of the prefabricated pipe pile in the x direction of the stress intelligent sensing joint according to the formula (2)x(ii) a Calculating the bending moment M of the precast tubular pile in the y direction of the stress intelligent sensing joint according to the formula (3)y；
Mx＝εMx·E·W (2)；
My＝εMy·E·W (3)；
In the formula, epsilonMxFor the intelligent sensing of the stress difference value epsilon of the prefabricated pipe pile in the x directionMx＝εx1-εx2；εMyFor the stress intelligent perception of the precast tubular pile in the y direction of the strain difference, epsilonMy＝εy1-εy2(ii) a W is the bending section coefficient of the intelligent sensing joint for the stress of the precast tubular pile;
calculating the inclination angle theta of the intelligent sensing joint for the stress of the precast tubular pile according to a formula (4);
step four: according to the axial force N of the intelligent sensing joint for the stress of the precast tubular pile and the bending moment M in the x direction of the intelligent sensing joint for the stress of the precast tubular pilexBending moment M of y-direction of prefabricated pipe pile stress intelligent sensing jointyAnalyzing the inclination angle theta of the prefabricated pipe pile stress intelligent sensing joint and determining the whole stress and posture information of the pipe pile; in the pile group foundation, the comprehensive evaluation of the construction quality and the service performance of the pile group foundation can be realized based on the pile forming stress and attitude analysis of a plurality of foundation piles.
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