Prestressed concrete pipe pile internal stress detection device and method

Abstract

The present invention relates to the technical field of pile body stress detection in civil engineering, and discloses a device and method for detecting the internal stress of a prestressed concrete pipe pile. The device comprises a tubular protective mechanism; a position adjustment mechanism; a strain gauge, wherein the strain gauge is connected to the position adjustment mechanism; a plastic protective sleeve, and the plastic protective sleeve is coated on the outside of the strain gauge; a heat exchange mechanism, wherein the heat exchange mechanism is arranged inside the tubular protective mechanism, and the heat exchange mechanism is used to transfer heat energy transferred to the strain gauge to the outside of the pipe pile; the present invention pre-installs the tubular protective mechanism on the steel cage of the pipe pile, and installs the position adjustment mechanism, the plastic protective sleeve and the heat exchange mechanism on the tubular protective mechanism, and fixes the strain gauge on the position adjustment mechanism and places it in the plastic protective sleeve, and at the same time continuously extracts heat energy transferred from concrete to the strain gauge through the heat exchange mechanism, so that the strain gauge can be in a stable working state.

Description

Technical Field

[0001] The present invention relates to the technical field of pile body stress detection in civil engineering, and more particularly to a device and method for detecting the internal stress of a prestressed concrete pipe pile. Background Art

[0002] Prestressed pipe piles (usually referring to concrete pipe piles) are used more and more widely in engineering as the foundation of civil engineering such as building structures and bridge structures. However, since the stress mechanism of piles is affected by many factors such as pile technology, soil characteristics, pile material properties, pile geometric characteristics, and load, even for single piles under vertical or horizontal loads, it is still difficult to study the mechanism of stress transmission to the surrounding soil.

[0003] By embedding strain gauges in prestressed tubular piles, we can obtain the relationship between load and the corresponding strain (stress) distributed along the pile body. This not only provides experimental data on the relationship between vertical (horizontal) load and vertical (horizontal) displacement at the pile top, but also the relationship between load and strain (stress) distributed along the pile body. This allows us to determine the distribution of pile side friction and pile end resistance, and explore the pile's load characteristics and stress transfer mechanisms.

[0004] However, during the pouring and centrifugal process of prestressed concrete piles, chemical reactions will occur, thereby releasing a large amount of heat energy. This large amount of heat energy will not only affect the detection accuracy of the strain gauge, but may even cause irreversible damage to the strain gauge, thereby causing the embedded strain gauge to fail and interrupting the stress detection process. Summary of the Invention

[0005] The purpose of the present invention is to provide a prestressed concrete pipe pile internal stress detection device and method in order to solve the above problems.

[0006] The present invention provides a device for detecting internal stress of a prestressed concrete pipe pile, comprising:

[0007] A tubular protective mechanism, the tubular protective mechanism being detachably connected to the reinforcement cage of the pipe pile;

[0008] A position adjustment mechanism is installed on one end of the tubular protection mechanism located inside the steel cage of the pipe pile;

[0009] A strain gauge connected to a position adjustment mechanism used to adjust the placement of the strain gauge within the steel cage. The strain gauge includes a stress detection end and a wire. The stress detection end is fixedly connected to the position adjustment mechanism. One end of the wire passes through the position adjustment mechanism and the tubular protective mechanism in sequence and extends to the exterior of the tubular protective mechanism.

[0010] A plastic protective sleeve, wherein the plastic protective sleeve is fixedly connected to the position adjustment mechanism and covers the outside of the strain gauge;

[0011] The heat exchange mechanism is arranged inside the tubular protective mechanism. The gap space between the plastic protective sleeve and the strain gauge is connected to the heat exchange mechanism through a position adjustment mechanism. The heat exchange mechanism is used to transfer the heat energy transferred to the strain gauge to the outside of the pipe pile.

[0012] As a further optimization scheme of the present invention, the tubular protective mechanism includes a protective tube, a stepped channel arranged inside the protective tube, a sealing cover detachably connected to one end of the protective tube, an inner sealing tube fixedly connected to the sealing cover, and several channels 1 arranged inside the protective tube, several of the channels 1 are arranged along the length direction of the tubular protective mechanism, the other end of the inner sealing tube is movably connected to the position adjustment mechanism, a sealed liquid conduction chamber 1 is formed between the protective tube, the sealing cover and the inner sealing tube, and several of the channels 1 are connected to the sealed liquid conduction chamber 1.

[0013] As a further optimization scheme of the present invention, the position adjustment mechanism includes a circumferential rotation component movably connected to the protective tube, a telescopic protection component detachably connected at the center position of the circumferential rotation component, and a limiting component fixedly connected to the circumferential rotation component, the limiting component is located on one side of the telescopic protection component, the plastic protective sleeve and the strain gauge are both fixedly connected to the telescopic protection component, the telescopic protection component is connected to the heat exchange mechanism through the circumferential rotation component, the gap space between the plastic protective sleeve and the strain gauge is connected to the circumferential rotation component through the telescopic protection component, and the limiting component is detachably connected to the telescopic protection component.

[0014] As a further optimization scheme of the present invention, the circular rotation component includes an outer ring body movably connected to the other end of the protective tube, several connecting rods connected to the inner circular surface of the outer ring body, an inner ring body coaxially arranged with the outer ring body, a screw hole one provided on the outer circular surface of the outer ring body, and a positioning screw one threadedly connected to the inside of the screw hole one, several of the connecting rods are fixedly connected to the inner ring body, several of the channels are connected to the gap space between the outer ring body and the inner ring body, and the inner sealing tube is movably connected to the inner ring body.

[0015] As a further optimization scheme of the present invention, the telescopic protective assembly includes a ring plate 1 fixedly connected to the outer ring body, a ring plate 2 coaxially arranged with the ring plate, an inner telescopic bellows and an outer telescopic bellows connected between the ring plate 1 and the ring plate 2, a plurality of channels 2 provided on the ring plate 1, and a plurality of channels 3 provided on the ring plate 2. The plastic protective sleeve and the strain gauge are both fixedly connected to the ring plate 2. A sealed liquid guide chamber 2 is formed between the ring plate 1, the inner telescopic bellows, the outer telescopic bellows and the ring plate 2. The two ends of the channel 2 are respectively connected to the gap space between the outer ring body and the connecting rod and the sealed liquid guide chamber 2. The two ends of the channel 3 are respectively connected to the sealed liquid guide chamber 2 and the gap space between the plastic protective sleeve and the strain gauge.

[0016] As a further optimization scheme of the present invention, the limiting assembly includes a fixed column fixedly connected to the outer ring body, a hinge plate 1 fixedly connected to the fixed column, a hinge plate 2 arranged parallel to the hinge plate 1, a movable column fixedly connected to the hinge plate 2, a movable sleeve slidably sleeved on the movable column, a screw hole 3 provided on the outer circular surface of the movable sleeve, a positioning screw 2 threadedly connected to the inside of the screw hole 3, and a limiting bolt connected between the hinge plate 1 and the hinge plate 2, the limiting bolt is used to adjust the angle between the movable column and the fixed column, a threaded portion is provided on the outer circular surface of the movable sleeve, and a screw hole 2 matching the threaded portion is provided on the outer circular surface of the ring plate 2.

[0017] As a further optimization solution of the present invention, the heat exchange mechanism includes a circulating heat exchange component and a pressure limiting component, and the circulating heat exchange component is connected to the circumferential rotation component through the pressure limiting component.

[0018] As a further optimized solution of the present invention, the circulating heat exchange component includes a liquid inlet pipe and a liquid outlet pipe connected to the sealing cover, and the liquid inlet pipe and the liquid outlet pipe are both communicated with the sealed liquid guide chamber.

[0019] As a further optimization scheme of the present invention, the pressure limiting component includes a two-way tube passing through the sealing cover, a limiting slide groove provided on the inner wall of the protective tube, a limiting slider slidably connected to the inside of the limiting slide groove, an annular sealing plate connected to the limiting slider, a channel four provided inside the protective tube, and a plurality of channels five provided on the annular sealing plate. Several of the channels five are respectively arranged corresponding to several channels one. The two-way tube is connected to the limiting slide groove through channel four. When channel five is coaxial with the corresponding channel, channel one is connected to the sealed liquid guide chamber one through channel five.

[0020] A method for detecting internal stress of a prestressed concrete pipe pile, using the above-mentioned device for detecting internal stress of a prestressed concrete pipe pile, comprises the following steps:

[0021] Step 100: vertically connect the tubular protective mechanism equipped with the position adjustment mechanism, the strain gauge, the plastic protective sleeve and the heat exchange mechanism to the steel cage of the pipe pile;

[0022] Step 200: Adjust the placement of the strain gauge in the steel cage of the pile through the position adjustment mechanism, and after the adjustment is completed, adjust the position adjustment mechanism to a fixed state;

[0023] Step 300: Lay out the casting template and pour concrete. After pouring, the heat energy transferred from the concrete to the strain gauge is conducted to the outside of the pile through the heat exchange mechanism. After a set time, the heat energy conduction of the heat exchange mechanism is stopped, and the strain gauge is started to obtain real-time strain change data inside the pile.

[0024] The beneficial effects of the present invention are as follows: the present invention pre-installs a tubular protective mechanism on the steel cage of the pipe pile, and installs a position adjustment mechanism, a plastic protective cover and a heat exchange mechanism on the tubular protective mechanism, and fixes the strain gauge on the position adjustment mechanism and places it in the plastic protective cover. At the same time, the heat energy transferred from the concrete to the strain gauge is continuously extracted through the heat exchange mechanism, so that the strain gauge can be in a stable working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a diagram showing the cooperation between the position adjustment mechanism and the plastic protective sleeve of the present invention;

[0027] Figure 3 The present invention Figure 2 A partial cross-sectional view of

[0028] Figure 4 The present invention Figure 2 A magnified view of point A in FIG;

[0029] Figure 5 The present invention Figure 2 Magnified view at B in FIG;

[0030] Figure 6 The present invention Figure 3 Magnified view of point C in FIG;

[0031] Figure 7 The present invention Figure 3 Magnified view at D in FIG;

[0032] Figure 8 The present invention Figure 3 Magnified view at E in FIG;

[0033] Figure 9 The present invention Figure 3 Magnified view of point F in FIG.

[0034] In the figure: 1. Tubular protection mechanism; 101. Protection tube; 102. Stepped channel; 103. Sealing cover; 104. Channel 1; 105. Inner sealing tube; 2. Circular rotation assembly; 201. Outer ring body; 202. Connecting rod; 203. Inner ring body; 204. Screw hole 1; 205. Positioning screw 1; 3. Telescopic protection assembly; 301. Ring plate 1; 3010. Channel 2; 302. Inner telescopic bellows; 303. Outer telescopic bellows; 304. Ring plate 2; 3040. Channel 3; 3041. Screw hole two; 4. Limiting assembly; 401. Fixed column; 402. Hinge plate one; 403. Hinge plate two; 404. Limiting bolt; 405. Movable column; 406. Movable sleeve; 407. Screw hole three; 408. Positioning screw two; 5. Plastic protective cover; 6. Heat exchange mechanism; 601. Liquid inlet pipe; 602. Liquid outlet pipe; 603. Two-way pipe; 604. Limiting slider; 605. Annular sealing plate; 606. Channel four; 607. Channel five; 7. Strain gauge; 701. Stress detection end; 702. Wire. DETAILED DESCRIPTION

[0035] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein. Additionally, features described with respect to some examples may also be combined in other examples.

[0036] like Figures 1-9 As shown, a device for detecting internal stress of a prestressed concrete pipe pile comprises:

[0037] A tubular protective mechanism 1 is detachably connected to the reinforcement cage of the pipe pile;

[0038] A position adjustment mechanism is installed on one end of the tubular protection mechanism 1 located inside the steel cage of the pipe pile;

[0039] Strain gauge 7, which is connected to the position adjustment mechanism. The position adjustment mechanism is used to adjust the layout of the strain gauge 7 within the steel cage. The strain gauge 7 includes a stress detection end 701 and a wire 702. The stress detection end 701 is fixedly connected to the position adjustment mechanism. One end of the wire 702 passes through the position adjustment mechanism and the tubular protective mechanism 1 in sequence and extends to the outside of the tubular protective mechanism 1;

[0040] A plastic protective cover 5, which is fixedly connected to the position adjustment mechanism and covers the outside of the strain gauge 7;

[0041] The heat exchange mechanism 6 is arranged inside the tubular protective mechanism 1. The gap space between the plastic protective sleeve 5 and the strain gauge 7 is connected to the heat exchange mechanism 6 through the position adjustment mechanism. The heat exchange mechanism 6 is used to transfer the heat energy transferred to the strain gauge 7 to the outside of the pipe pile.

[0042] It should be noted that when implementing the internal stress detection process of the pipe pile, the tubular protection mechanism 1 equipped with the position adjustment mechanism, the strain gauge 7, the plastic protection sleeve 5 and the heat exchange mechanism 6 is first vertically connected to the steel cage of the pipe pile;

[0043] Adjust the placement of the strain gauge 7 in the steel cage of the pile through the position adjustment mechanism, and adjust the position adjustment mechanism to a fixed state after the adjustment is completed;

[0044] The pouring formwork is laid out and concrete is poured. After the pouring is completed, the heat energy transferred from the concrete to the strain gauge 7 is conducted to the outside of the pile through the heat exchange mechanism 6. After the set time, the heat energy conduction of the heat exchange mechanism 6 is stopped, and the strain gauge 7 is started to obtain the real-time data of the strain change inside the pile. The set time is the time consumed by the internal temperature of the concrete to drop to the set range, which is usually 3-5 days after the concrete is poured. In the corresponding time range, the change in the heat energy value conducted by the heat exchange mechanism 6 can be used for auxiliary judgment.

[0045] In an optional embodiment of the present invention, Figure 2 and 3 The tubular protective mechanism 1 includes a protective tube 101, a stepped channel 102 provided inside the protective tube 101, a sealing cover 103 detachably connected to one end of the protective tube 101, an inner sealing tube 105 fixedly connected to the sealing cover 103, and a plurality of channels 104 provided inside the protective tube 101. The plurality of channels 104 are arranged along the length direction of the tubular protective mechanism 1. The other end of the inner sealing tube 105 is movably connected to the position adjustment mechanism. A sealed liquid guide chamber 1 is formed between the protective tube 101, the sealing cover 103 and the inner sealing tube 105. The plurality of channels 104 are communicated with the sealed liquid guide chamber 1.

[0046] It should be noted that, as mentioned above, after the position adjustment mechanism is installed on the protective tube 101, one end of the wire 702 is passed through the inner sealing tube 105 and then pulled out from the perforation set on the sealing cover 103. The length of the protective tube 101 can be set and manufactured according to the depth at which the stress detection end 701 is installed. The protective tube 101 can also be used as a reinforcement of the steel cage, thereby further improving the strength of the steel cage. The heat exchange mechanism 6 is installed in a sealed liquid guide chamber, which is connected to the channel 104 through the sealed liquid guide chamber 1, so that the heat exchange medium can be introduced into the sealed liquid guide chamber 1 through the heat exchange mechanism 6 and circulated, so that the heat energy transferred to the wire 702 can be effectively transferred to the outside of the pipe pile.

[0047] In an optional embodiment of the present invention, Figure 2 and Figure 3 The position adjustment mechanism includes a circumferential rotation component 2 movably connected to the protective tube 101, a telescopic protection component 3 detachably connected at the center position of the circumferential rotation component 2, and a limit component 4 fixedly connected to the circumferential rotation component 2. The limit component 4 is located on one side of the telescopic protection component 3. The plastic protection sleeve 5 and the strain gauge 7 are both fixedly connected to the telescopic protection component 3. The telescopic protection component 3 is connected to the heat exchange mechanism 6 through the circumferential rotation component 2. The gap space between the plastic protection sleeve 5 and the strain gauge 7 is connected to the circumferential rotation component 2 through the telescopic protection component 3. The limit component 4 is detachably connected to the telescopic protection component 3.

[0048] It should be noted that, as mentioned above, when adjusting the layout posture of the stress detection end 701, the telescopic protection component 3 and the limiting component 4 and the stress detection end 701 fixedly connected to the telescopic protection component 3 can be driven by the circular rotation component 2 to rotate around the central axis of the protection tube 101 to a set angle. After rotation, the circular rotation component 2 and the protection tube 101 are re-limited and fixed. When adjusting the angle between the stress detection end 701 and the horizontal plane, the telescopic protection component 3 is stretched and bent. At the same time, the corresponding limiting component 4 is adjusted to a matching position, and then the telescopic protection component 3 is connected to the limiting component 4, so that the limiting component 4 is limited and fixed at the set position through the telescopic protection component 3, so that the stress detection end 701 can be adjusted to any layout posture within the set range, so that the stress change values ​​in different directions inside the concrete can be obtained.

[0049] In an optional embodiment of the present invention, Figure 2-Figure 4The circular rotating component 2 includes an outer ring body 201 movably connected to the other end of the protective tube 101, a plurality of connecting rods 202 connected to the inner circular surface of the outer ring body 201, an inner ring body 203 coaxially arranged with the outer ring body 201, a screw hole 204 provided on the outer circular surface of the outer ring body 201 and a positioning screw 205 threadedly connected to the inside of the screw hole 204, the plurality of connecting rods 202 are fixedly connected to the inner ring body 203, the plurality of channels 104 are communicated with the gap space between the outer ring body 201 and the inner ring body 203, and the inner sealing tube 105 is movably connected to the inner ring body 203.

[0050] It should be noted that, as mentioned above, when the stress detection end 701 is driven to rotate around the vertical center axis of the protective tube 101 by the circular rotation component 2, specifically, the positioning screw 205 is unscrewed from the screw hole 204 to a set length. At this time, the positioning screw 205 is no longer in contact with the protective tube 101, and the outer ring body 201 is in a freely rotatable state. Then, after controlling the outer ring body 201 to rotate along the set direction and the set angle, the positioning screw 205 is screwed into the screw hole 204 again, and the positioning screw 205 is made to contact with the protective tube 101 and apply the set extrusion force. Correspondingly, the friction coefficient of the contact portion between the positioning screw 205 and the protective tube 101 can be increased, thereby improving the limiting effect of the positioning screw 205 on the outer ring body 201.

[0051] In an optional embodiment of the present invention, Figure 3 、 Figure 8 and Figure 9 The telescopic protective assembly 3 includes a ring plate 1 301 fixedly connected to the outer ring body 201, a ring plate 2 304 coaxially arranged with the ring plate 1 301, an inner telescopic bellows 302 and an outer telescopic bellows 303 connected between the ring plate 1 301 and the ring plate 2 304, a plurality of channels 2 3010 provided on the ring plate 1 301, and a plurality of channels 3 3040 provided on the ring plate 2 304. The plastic protective sleeve 5 and the strain gauge 7 are both fixedly connected to the ring plate 2 304. A sealed liquid guide chamber 2 is formed between the ring plate 1 301, the inner telescopic bellows 302, the outer telescopic bellows 303 and the ring plate 2 304. The two ends of the channel 2 3010 are respectively connected to the gap space between the outer ring body 201 and the connecting rod 202 and the sealed liquid guide chamber 2. The two ends of the channel 3 3040 are respectively connected to the sealed liquid guide chamber 2 and the gap space between the plastic protective sleeve 5 and the strain gauge 7.

[0052] It should be noted that, as described above, when adjusting the angle between the stress detection end 701 and the horizontal plane, the ring plate 2 304 is pulled away from the ring plate 1 301. During this process, the inner telescopic bellows 302 and the outer telescopic bellows 303 are in a stretched state, and then the ring plate 2 304 is bent toward the direction of the limit component 4. The inner telescopic bellows 302 and the outer telescopic bellows 303 are in a state of bending in the same direction. No matter how the bending states of the inner telescopic bellows 302 and the outer telescopic bellows 303 change, the sealed liquid guide chamber 2 is In the conductive state, the circulating heat exchange medium introduced by the heat exchange mechanism 6 flows through the sealed liquid guide chamber 1, the channel 104, the gap between the outer ring body 201 and the inner ring body 203, the channel 2 3010, the sealed liquid guide chamber 2, the channel 3 3040, and then enters the gap between the plastic protective sleeve 5 and the strain gauge 7. At this time, the plastic protective sleeve 5 can expand and deform slightly outward under the action of hydraulic pressure. The deformation is small and does not affect the concrete forming process. After the plastic protective sleeve 5 is reset, no gap will actually be generated between it and the concrete.

[0053] In an optional embodiment of the present invention, Figure 3 、 Figure 5 and Figure 9 The limiting assembly 4 includes a fixed column 401 fixedly connected to the outer ring body 201, a hinge plate 1 402 fixedly connected to the fixed column 401, a hinge plate 2 403 arranged parallel to the hinge plate 1 402, a movable column 405 fixedly connected to the hinge plate 2 403, a movable sleeve 406 slidably sleeved on the movable column 405, a screw hole 3 407 provided on the outer circumferential surface of the movable sleeve 406, a positioning screw 2 408 threadedly connected to the inside of the screw hole 3 407, and a limiting bolt 404 connected between the hinge plate 1 402 and the hinge plate 2 403. The limiting bolt 404 is used to adjust the angle between the movable column 405 and the fixed column 401. A threaded portion is provided on the outer circumferential surface of the movable sleeve 406, and a screw hole 2 3041 matching the threaded portion is provided on the outer circumferential surface of the ring plate 2 304.

[0054] It should be noted that, as mentioned above, when the telescopic protective assembly 3 is limited and fixed by the limiting assembly 4, the angle between the movable column 405 and the fixed column 401 is adaptively adjusted according to the actual stretching length and bending state of the telescopic protective assembly 3. Specifically, the limiting bolt 404 is first loosened so that the hinge plate 1 402 and the hinge plate 2 403 are no longer limited, so that the hinge plate 2 403 can rotate around the central axis of the limiting bolt 404. After rotating to a set angle, the limiting bolt 404 is tightened again so that the hinge plate 2 403 is limited and fixed. At this time, the movable column 405 is limited and fixed, and then the positioning screw 2 408 is removed from the screw hole 4 07, move the movable sleeve 406 toward the second screw hole 3041 on the ring plate 304, and rotate the movable sleeve 406 when it is inserted into the second screw hole 3041, so that the movable sleeve 406 is gradually screwed into the second screw hole 3041. When the movable sleeve 406 is completely screwed into the second screw hole 3041, screw the second positioning screw 408 into the third screw hole 407 again, so that the movable sleeve 406 is again limited and fixed on the movable column 405. At this time, the ring plate 304 is limited and fixed, so that the stress detection end 701 connected to the ring plate 304 is also limited and fixed at the set position, thereby achieving the adjustment of the layout posture of the stress detection end 701.

[0055] In an optional embodiment of the present invention, Figure 3 、 Figure 6 and Figure 7 The heat exchange mechanism 6 includes a circulating heat exchange component and a pressure limiting component. The circulating heat exchange component is connected to the circular rotating component 2 through the pressure limiting component.

[0056] The circulating heat exchange component includes a liquid inlet pipe 601 and a liquid outlet pipe 602 connected to the sealing cover 103. The liquid inlet pipe 601 and the liquid outlet pipe 602 are both communicated with the sealed liquid guide chamber.

[0057] The pressure limiting assembly includes a two-way tube 603 passing through the sealing cover 103, a limiting slide groove provided on the inner wall of the protective tube 101, a limiting slider 604 slidably connected to the inside of the limiting slide groove, an annular sealing plate 605 connected to the limiting slider 604, a channel four 606 provided inside the protective tube 101, and a plurality of channels five 607 provided on the annular sealing plate 605. The plurality of channels five 607 are respectively arranged to correspond to the plurality of channels one 104. The two-way tube 603 is connected to the limiting slide groove through the channel four 606. When the channel five 607 is coaxially corresponding to the corresponding channel one 104, the channel one 104 is connected to the sealed liquid guide chamber one through the channel five 607.

[0058] It should be noted that, as described above, during the heat conduction process through the heat exchange mechanism 6, a heat exchange medium is input into the sealed liquid guide chamber 1 through the liquid inlet pipe 601, and the heat exchange medium flows through the sealed liquid guide chamber 1, the channel 104, the gap between the outer ring body 201 and the inner ring body 203, the channel 2 3010, the sealed liquid guide chamber 2, the channel 3 3040, and then enters the gap between the plastic protective sleeve 5 and the strain gauge 7. With the continuous input of the heat exchange medium, when the sealed liquid guide chamber 1, the channel 104, the outer ring body 201 and the inner ring body After the gaps between 203, channel 2 3010, sealed liquid-conducting chamber 2, channel 3 3040, and the gaps between the plastic protective sleeve 5 and the strain gauge 7 are all filled with heat exchange medium, the heat exchange medium begins to be discharged toward the liquid outlet pipe 602. During this process, most of the heat energy transferred from the concrete to the stress detection end 701 and the wire 702 is conducted to the outside of the pile by the heat exchange medium, thereby minimizing the impact of heat energy on the stress detection end 701 and preventing the stress detection process from being unable to be completed due to a malfunction of the stress detection end 701.

[0059] The pressure of the heat exchange medium can also be adjusted by an external input pump. After the heat exchange is completed, in order to enable the stress detection end 701 to clearly obtain the stress change data in the concrete, the plastic protective sleeve 5 can be restored to a state of being tightly wrapped on the stress detection end 701, or a certain amount of heat exchange medium can be left between the plastic protective sleeve 5 and the stress detection end 701, so that the plastic protective sleeve 5 is in a slightly expanded state. Both of these states will not affect the stress data acquisition of the stress detection end 701. Both of these states require double The through pipe 603 introduces a medium of set pressure into the channel four 606. The medium of set pressure pushes the limit slider 604 to rotate around the central axis of the protective tube 101 to a set angle, thereby driving the annular sealing plate 605 to rotate in the same direction and angle, so that the channel five 607 is no longer connected to the channel one 104. At this time, the gap space between the plastic protective sleeve 5 and the stress detection end 701 and the sealed liquid guide chamber two are in a stable hydraulic state, so that the stress detection end 701 only obtains the stress change parameters and will not be affected by other parameters.

[0060] The above describes this embodiment, but this embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. A prestressed concrete pipe pile internal stress detection device, characterized in that: include: A tubular protective mechanism (1), the tubular protective mechanism (1) being detachably connected to the steel cage of the pipe pile; A position adjustment mechanism, the position adjustment mechanism being mounted on one end of the tubular protection mechanism (1) located inside the steel cage of the pipe pile; A strain gauge (7), the strain gauge (7) being connected to a position adjustment mechanism, the position adjustment mechanism being used to adjust the arrangement posture of the strain gauge (7) in the steel cage, the strain gauge (7) comprising a stress detection end (701) and a wire (702), the stress detection end (701) being fixedly connected to the position adjustment mechanism, one end of the wire (702) passing through the position adjustment mechanism and the tubular protective mechanism (1) in sequence and extending to the outside of the tubular protective mechanism (1); A plastic protective sleeve (5), wherein the plastic protective sleeve (5) is fixedly connected to the position adjustment mechanism, and the plastic protective sleeve (5) covers the outside of the strain gauge (7); A heat exchange mechanism (6), the heat exchange mechanism (6) being arranged inside the tubular protective mechanism (1), the gap space between the plastic protective sleeve (5) and the strain gauge (7) being connected to the heat exchange mechanism (6) via a position adjustment mechanism, the heat exchange mechanism (6) being used to transfer heat energy transferred to the strain gauge (7) to the outside of the pipe pile; The tubular protective mechanism (1) comprises a protective tube (101), a stepped channel (102) provided inside the protective tube (101), a sealing cover (103) detachably connected to one end of the protective tube (101), an inner sealing tube (105) fixedly connected to the sealing cover (103), and a plurality of channels (104) provided inside the protective tube (101), wherein the plurality of channels (104) are arranged along the length direction of the tubular protective mechanism (1), the other end of the inner sealing tube (105) is movably connected to the position adjustment mechanism, a sealed liquid guide chamber (1) is formed between the protective tube (101), the sealing cover (103) and the inner sealing tube (105), and the plurality of channels (104) are communicated with the sealed liquid guide chamber (1); The position adjustment mechanism comprises a circumferential rotation component (2) movably connected to the protection tube (101), a telescopic protection component (3) detachably connected to the center position of the circumferential rotation component (2), and a limit component (4) fixedly connected to the circumferential rotation component (2), wherein the limit component (4) is located on one side of the telescopic protection component (3), the plastic protection sleeve (5) and the strain gauge (7) are both fixedly connected to the telescopic protection component (3), the telescopic protection component (3) is connected to the heat exchange mechanism (6) through the circumferential rotation component (2), the gap space between the plastic protection sleeve (5) and the strain gauge (7) is connected to the circumferential rotation component (2) through the telescopic protection component (3), and the limit component (4) is detachably connected to the telescopic protection component (3); The circumferential rotation component (2) includes an outer ring body (201) movably connected to the other end of the protective tube (101), a plurality of connecting rods (202) connected to the inner circumferential surface of the outer ring body (201), an inner ring body (203) coaxially arranged with the outer ring body (201), a screw hole (204) provided on the outer circumferential surface of the outer ring body (201), and a positioning screw (205) threadedly connected to the inside of the screw hole (204), a plurality of the connecting rods (202) are fixedly connected to the inner ring body (203), a plurality of the channel (104) are communicated with the gap space between the outer ring body (201) and the inner ring body (203), and the inner sealing tube (105) is movably connected to the inner ring body (203); The telescopic protection assembly (3) comprises a ring plate 1 (301) fixedly connected to the outer ring body (201), a ring plate 2 (304) coaxially arranged with the ring plate 1 (301), an inner telescopic bellows (302) and an outer telescopic bellows (303) connected between the ring plate 1 (301) and the ring plate 2 (304), a plurality of second holes (3010) arranged on the ring plate 1 (301) and a plurality of third holes (3040) arranged on the ring plate 2 (304), the plastic protection sleeve (5) and the strain gauge (7 ) are fixedly connected to the ring plate 2 (304), and the ring plate 1 (301), the inner telescopic bellows (302), the outer telescopic bellows (303) and the ring plate 2 (304) form a sealed liquid guide chamber 2, and the two ends of the channel 2 (3010) are respectively connected to the gap space between the outer ring body (201) and the connecting rod (202) and the sealed liquid guide chamber 2, and the two ends of the channel 3 (3040) are respectively connected to the sealed liquid guide chamber 2 and the gap space between the plastic protective sleeve (5) and the strain gauge (7); The limiting assembly (4) comprises a fixed column (401) fixedly connected to the outer ring body (201), a hinge plate 1 (402) fixedly connected to the fixed column (401), a hinge plate 2 (403) arranged parallel to the hinge plate 1 (402), a movable column (405) fixedly connected to the hinge plate 2 (403), a movable sleeve (406) slidably sleeved on the movable column (405), and a screw hole 3 (407) provided on the outer circumferential surface of the movable sleeve (406). , a positioning screw (408) threadedly connected to the inside of the screw hole (407) and a limiting bolt (404) connected between the hinge plate (402) and the hinge plate (403), the limiting bolt (404) is used to adjust the angle between the movable column (405) and the fixed column (401), the outer circumferential surface of the movable sleeve (406) is provided with a threaded portion, and the outer circumferential surface of the ring plate (304) is provided with a screw hole (3041) that matches the threaded portion; The heat exchange mechanism (6) comprises a circulating heat exchange component and a pressure limiting component, and the circulating heat exchange component is connected to the circumferential rotation component (2) via the pressure limiting component; The circulating heat exchange component comprises a liquid inlet pipe (601) and a liquid outlet pipe (602) connected to the sealing cover (103), and the liquid inlet pipe (601) and the liquid outlet pipe (602) are both in communication with the sealed liquid guide chamber; The pressure limiting component includes a double-way tube (603) passing through the sealing cover (103), a limiting slide groove provided on the inner wall of the protective tube (101), a limiting slider (604) slidably connected to the inside of the limiting slide groove, an annular sealing plate (605) connected to the limiting slider (604), a channel four (606) provided inside the protective tube (101) and a plurality of channels five (607) provided on the annular sealing plate (605), a plurality of channels five (607) respectively corresponding to a plurality of channels one (104), the double-way tube (603) is connected to the limiting slide groove through the channel four (606), and when the channel five (607) corresponds coaxially with the corresponding channel one (104), the channel one (104) is connected to the sealed liquid guide chamber one through the channel five (607).

2. A method for detecting internal stress of a prestressed concrete pipe pile, characterized in that: The internal stress detection device for prestressed concrete pipe piles according to claim 1 comprises the following steps: Step 100: vertically connect the tubular protective mechanism (1) equipped with the position adjustment mechanism, the strain gauge (7), the plastic protective sleeve (5) and the heat exchange mechanism (6) to the steel cage of the pipe pile; Step 200, adjusting the placement of the strain gauge (7) in the steel cage of the pipe pile by means of a position adjustment mechanism, and adjusting the position adjustment mechanism to a fixed state after the adjustment is completed; Step 300: Arrange the casting template and cast concrete. After the casting is completed, the heat energy transferred from the concrete to the strain gauge (7) is conducted to the outside of the pipe pile through the heat exchange mechanism (6). After a set time, the heat energy conduction of the heat exchange mechanism (6) is stopped, and the strain gauge (7) is started to obtain real-time data on the strain force change inside the pipe pile.

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