A building slow-bonding prestress detection device, system and use method thereof

Abstract

A building slow-bonding prestressed stress detection device comprises a limit sleeve sleeved on an anchor seat, a support cylinder is arranged on the side of the limit sleeve away from the anchor seat, the support cylinder is coaxially arranged with the anchor seat, and a plurality of telescopic oil cylinders are arranged circumferentially on the outer wall, the output end of the telescopic oil cylinder is arranged perpendicular to the limit sleeve, and the distance between the limit sleeve and the support cylinder can be adjusted; a plurality of selective locking sleeves cooperating with steel strands are arranged on the inner side of the support cylinder, and each selective locking sleeve is penetrated by a single steel strand, and the selective locking sleeve can freely switch the connection state with the steel strand, that is, it can be locked relative to the steel strand and move relative to the steel strand; a displacement sensor is also arranged on the outer side of the support cylinder to monitor the linear distance with the limit sleeve, and the detection items to be performed can be freely selected through the selective locking sleeve and the prestressed stress detection can be completed without disassembly and assembly in the middle, and its adaptation system and use method are simultaneously disclosed.

Description

Technical Field

[0001] The invention relates to the technical field of prestress detection, and in particular to a building slow-bonding prestress detection device, a system and a use method thereof. Background Art

[0002] As a commonly used building structure, the slow-bonded prestressed structure will not be described in detail. The conventional reverse tension method can also be used to detect prestress. The reverse tension method can draw the FS prestress curve by fitting, so that the staff can quickly obtain effective prestress information. In addition, the existing prestress detection devices are mainly divided into two types, one is a device for single-strand tensioning, and the other is a device for whole-bundle tensioning. They are not universal. When the number of steel strands in the anchor seat is small, single-strand tensioning and whole-bundle tensioning detection can be carried out by different equipment respectively. However, the number of anchor seat steel strands is large, for example, when the conventional 7-strand arrangement is used, the above method needs to be used for detection, and the single-strand tensioning detection operation needs to be repeated seven times, and the whole-bundle tensioning equipment operation needs to be carried out later, which is cumbersome. Summary of the invention

[0003] In order to solve the problem that the above-mentioned single-strand tensioning equipment and whole-bundle tensioning equipment cannot be used interchangeably, the present invention provides a building slow-bonding prestressing detection device, system and use method thereof.

[0004] The technical solution of the present invention is as follows:

[0005] A building slow-bonding prestress detection device comprises a limit sleeve sleeved on an anchor seat, a support cylinder is arranged on the side of the limit sleeve away from the anchor seat, the support cylinder is coaxially arranged with the anchor seat, and a plurality of telescopic cylinders are arranged in the circumferential direction of the outer wall, the output end of the telescopic cylinder is arranged perpendicular to the limit sleeve, and the distance between the limit sleeve and the support cylinder can be adjusted;

[0006] A plurality of selective locking sleeves cooperating with the steel strands are arranged inside the support cylinder, and each selective locking sleeve is penetrated by a single steel strand. The selective locking sleeve can freely switch the connection state with the steel strand, that is, it can be locked relative to the steel strand and move relative to the steel strand;

[0007] The outer side of the support cylinder is also provided with a displacement sensor to monitor the linear distance between the support cylinder and the limit sleeve.

[0008] Different from the two existing reverse tension detection devices, this device can complete single-wire tensioning and whole-bundle tensioning, and there is no need to replace the equipment in the middle. After the device is installed, single-wire tensioning detection and finally whole-bundle tensioning detection can be carried out in sequence, and no human intervention is required in the middle.

[0009] As a preferred solution, 7 selective locking sleeves are provided, and the selective locking sleeve at the center position is coaxially arranged with the anchor seat and is detachably connected to the support cylinder through the second connecting piece, and the selective locking sleeves at other positions are circumferentially arranged around the central axis of the support cylinder and are detachably connected to the support cylinder through the first connecting piece. When there are too many steel strands, the situation is more complicated, and it is generally not necessary to perform tensioning detection on each steel strand in turn. Therefore, this device is only adapted for 7 or less steel strands.

[0010] In order to cope with the use of steel strands of different specifications, in addition to the selective locking sleeve at the center position, the spacing of other selective locking sleeves relative to the central axis of the supporting cylinder can be adjusted. Through the adjustment method, it can be used for steel strands with different spacings and can also be applied to steel strands of different diameters.

[0011] The specific structure of the above-mentioned selective locking sleeve is that the selective locking sleeve includes a fixed sleeve, the fixed sleeve is connected to a positioning sleeve on the side close to the limit sleeve through a connecting rod, and the positioning sleeve does not contact the fixed sleeve, and an adjusting plate is arranged between the two, the adjusting plate is connected to the fixed sleeve through a telescopic push rod, and the spacing with the positioning sleeve can be adjusted, the positioning sleeve is circumferentially provided with a plurality of locking plugs around the central axis, the two ends of the locking plug respectively penetrate from the inner wall of the positioning sleeve and the side close to the adjusting plate, and the locking plug can be pushed and moved by the adjusting plate, thereby adjusting the extension of the locking plug on the inner wall of the positioning sleeve. By driving the adjusting plate to change its position, the locking plug can be pressed down, thereby moving it toward the central axis direction of the positioning sleeve, thereby clamping the steel strand therein, and in this way, it can be applied to steel strands of different specifications and diameters, has strong applicability, and can be selectively fixed, and after being released, it will not be fixed relative to the steel strand during the tension process.

[0012] The specific structure of the first connecting member is that the first connecting member includes a guide rod and a threaded rod connected to the fixed sleeve, and both the guide rod and the threaded rod pass through the mounting hole of the side wall of the supporting cylinder, and the threaded rod is provided with an adjustment nut on the outside of the supporting cylinder, so as to realize the position adjustment and thus be suitable for the adaptation of steel strands with different spacings.

[0013] The specific structure of the above-mentioned second connecting member is that the second connecting member is connected to the fixed sleeve and is detachably connected to the top hole of the supporting cylinder through bolts, and the second connecting member is provided with a clearance hole at the position of the steel strand.

[0014] As a preferred solution, the through-connecting rod and the telescopic push rod are staggered, and the through-connecting rod and the locking plug plate are staggered.

[0015] The specific structure of the above-mentioned limit sleeve is that an annular positioning groove is provided on the side of the limit sleeve close to the supporting cylinder, and the output end of the telescopic cylinder can be inserted into the positioning groove, thereby ensuring the relative fixation of the two and achieving a certain relative rotation to avoid separation of the two during the detection process.

[0016] A building slow-bonding prestress detection system uses the above-mentioned building slow-bonding prestress detection device and includes a main control terminal, the input end of the main control terminal is connected to a displacement sensor, and the output end of the main control terminal is connected to a telescopic push rod and a telescopic oil cylinder.

[0017] A method for using a building slow-bonding prestress detection system uses the above-mentioned building slow-bonding prestress detection system and includes the following steps:

[0018] S1. Install the prestress detection device, connect the limit sleeve with the anchor seat, then adjust the first connector according to the spacing of the steel strands to align the selective locking sleeve with the steel strands, and pass the steel strands through each selective locking sleeve;

[0019] S2, single strand slow-bonding prestress detection, the main control terminal drives any telescopic push rod to fix the currently selected locking sleeve and the strand, then the main control terminal drives the telescopic cylinder and records the value of the displacement sensor until one detection is completed and stops, repeating multiple times until all strands are detected;

[0020] S3, slow-bonding prestressing test of the whole bundle of steel strands. The main control terminal drives all telescopic push rods to fix all selective locking sleeves with the steel strands. Then the main control terminal drives the telescopic cylinder and records the value of the displacement sensor until one test is completed and then stops.

[0021] S4. Disassemble the detection device, reset the telescopic push rod and telescopic cylinder, remove the supporting cylinder and its connecting structure from the steel strand, and then remove the limit sleeve.

[0022] Through the above method, it can be seen that compared with the existing method that requires frequent manual switching between steel strands, the present device only needs to be fixed once to complete all detection operations.

[0023] As a preferred solution, the method further comprises the following steps:

[0024] For the slow-bonding prestress detection of multiple steel strands, the main control terminal drives any number of telescopic push rods to fix any number of selective locking sleeves to the steel strands. Then the main control terminal drives the telescopic cylinder and records the value of the displacement sensor until one detection is completed and stops. Compared with existing equipment, this device can also perform prestress detection on multiple steel strands at the same time, and this method is different from single strand and whole bundle, and the number and position of steel strands that need to be tensioned can be freely selected.

[0025] The beneficial effects of the present invention are as follows: the present invention is a building slow-bonding prestressed detection device, system and use method thereof, which are different from the existing detection equipment. Firstly, the present device only needs to be installed once, and then the detection items to be performed can be freely selected. It can be a single-strand tensioning detection, a multi-strand tensioning detection, or a whole-bundle tensioning detection. There is no need to disassemble and change the position of the device in the middle. During the detection, the steel strand to be detected can be selected by freely controlling the selective locking sleeve, or the whole-bundle tensioning detection can be performed by simultaneously driving the selective locking sleeve. The degree of freedom is extremely high and the applicability is relatively strong. It can be adapted and installed for steel strands with different spacings to ensure the vertical state of the steel strands during the tensioning detection process, and it can also be locked for steel strands with different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0027] In the attached picture:

[0028] Figure 1 It is a schematic diagram of the top view structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the top view structure of the present invention (applicable to different scenarios);

[0030] Figure 3 Schematic diagram of the structure of the prestressed steel strand and anchor seat for slow bonding;

[0031] Figure 4 for Figure 3 Schematic diagram of the structure after installing the limit sleeve;

[0032] Figure 5 It is a schematic diagram of the cross-sectional structure of the limiting sleeve plate of the present invention;

[0033] Figure 6 It is a schematic diagram of the top view of the supporting cylinder and the telescopic cylinder of the present invention;

[0034] Figure 7This is a schematic diagram of the cross-sectional structure of the support cylinder of the present invention;

[0035] Figure 8 for Figure 6 A schematic diagram of the structure after connecting a plurality of selective locking sleeves via a first connecting member;

[0036] Fig. 9 It is a schematic diagram of the structure of the second connecting member and the selective locking sleeve of the present invention;

[0037] Fig.10 It is a schematic diagram of the structure of the first connecting member and the selective locking sleeve of the present invention;

[0038] Fig.11 for Fig.10 Schematic diagram of the cross-section structure;

[0039] Fig.12 It is a schematic diagram of the fixing sleeve and related structures of the present invention;

[0040] Fig.13 This is a schematic diagram of the positioning sleeve and related structures of the present invention;

[0041] Fig.14 It is a schematic cross-sectional structure diagram of the positioning sleeve and the locking plug plate of the present invention;

[0042] Fig.15 This is a schematic diagram of the principle of prestressing test using the reverse tension method;

[0043] The components represented by the reference numerals in the figure are:

[0044] 1. Limit sleeve; 11. Positioning groove; 12. Card interface; 2. Support cylinder; 21. Mounting hole; 22. Extension mounting seat; 23. Top hole; 3. Telescopic cylinder; 4. Selective locking sleeve; 41. Fixed sleeve; 42. Positioning sleeve; 43. Through-connecting rod; 44. Adjusting pressure plate; 45. Locking plug plate; 46. Telescopic push rod; 5. First connecting piece; 51. Guide rod; 52. Threaded rod; 53. Adjusting nut; 6. Second connecting piece; 61. Make way hole; 7. Steel strand; 8. Anchor seat. DETAILED DESCRIPTION

[0045] like Figure 1-2 The building slow-bonding prestress detection device shown in FIG. 1 includes a limit sleeve 1 sleeved on an anchor seat 8, and the limit sleeve 1 is as shown in FIG. Figure 4 , 5 As shown, a card interface 12 is provided, and the card interface 12 can be connected with Figure 3 The anchor seat 8 shown in the figure is adapted, and after the above-mentioned limit sleeve 1 cannot move and is coaxial with the anchor seat 8. After that, the side of the limit sleeve 1 away from the anchor seat 8 is provided with a Figure 6 , 7The support cylinder 2 shown, it should be noted that the support cylinder 2 is coaxially arranged with the anchor seat 8 to ensure that the position can be accurately aligned, and a plurality of telescopic cylinders 3 are arranged circumferentially on the outer wall, the output end of the telescopic cylinder 3 is arranged perpendicular to the limit sleeve 1, and the spacing between the limit sleeve 1 and the support cylinder 2 can be adjusted, and the specific structure of the limit sleeve 1 is that the limit sleeve 1 is provided with an annular positioning groove 11 on the side close to the support cylinder 2, and the output end of the telescopic cylinder 3 can be inserted into the positioning groove 11, thereby ensuring that the two are relatively fixed, and can achieve a certain relative rotation, avoiding the separation of the two during the detection process, when in use, it is only necessary to insert the output ends of all the telescopic cylinders 3 into the positioning groove 11, so as to ensure that the support cylinder 2 and the limit sleeve 1 are coaxial, and after insertion, limited by the limitation of the positioning groove 11, the support cylinder 2 will be relatively fixed with the limit sleeve 1, and the two will not be able to be separated without external force, through the above method, it is possible to liberate the staff, thereby allowing them to stay away from this detection position, which is safer.

[0046] Afterwards, a plurality of selective locking sleeves 4 cooperating with the steel strands 7 are arranged on the inner side of the support cylinder 2. It should be noted that it is not necessary to use this device for the design in which two steel strands are bundled. Therefore, according to the standard, the design in which seven steel strands are bundled best meets the use requirements of this device. For this reason, seven selective locking sleeves 4 are provided.

[0047] It should be noted that in the above structure, each selective locking sleeve 4 is penetrated by a single steel strand 7 to ensure that the selective locking sleeve 4 can freely switch the connection state with the steel strand 7, that is, it can be locked relative to the steel strand 7 and move relative to the steel strand 7. When a single selective locking sleeve 4 is relatively fixed or locked to the steel strand 7, a single steel strand tensioning test can be performed on it, and when all the selective locking sleeves 4 are relatively fixed or locked to the steel strands, a tensioning test can be performed on the entire bundle of steel strands.

[0048] Afterwards, in order to obtain the relative relationship between the displacement and the counter-tension, a displacement sensor is also provided on the outside of the support cylinder 2 to monitor the linear distance with the limit sleeve 1. The detection can be completed in the above manner. The relevant detection method is the same as the prior art and will not be described in detail.

[0049] It can be seen that the above structure can be used to realize that, unlike the two existing reverse tension detection devices, this device can complete single-strand tensioning and whole-bundle tensioning, and there is no need to replace the equipment in the middle. It only needs to be installed, and then single-strand tensioning detection and finally whole-bundle tensioning detection can be carried out in sequence, and no human intervention is required in the middle. Compared with the conventional single-strand tensioning detection, after obtaining the relative relationship, the equipment is disassembled and replaced to change the working position, and it is installed to other steel strands. It is more labor-saving. The fixation of the steel strand and the selective locking sleeve 4 only needs to be selected after penetration. Therefore, there is no need to complete the use of multiple selective locking sleeves 4. There is no need to disassemble the equipment after the single-strand tensioning detection is completed, but it can wait until all the tests are completed before disassembling it, and there is basically no need for human intervention during the entire detection process.

[0050] It can be seen from the above structure that the focus of the detection of this device is to be able to achieve the fixation of a single steel strand, that is, to be able to freely control each selective locking sleeve 4, and the selective locking sleeve 4 can freely switch the state. Therefore, the above key points are explained in detail, which is also the core point of this device, namely, the structural design of the selective locking sleeve 4.

[0051] like Figure 10-14 As shown, the specific structure of the selective locking sleeve 4 is that the selective locking sleeve 4 includes a fixed sleeve 41, which is mainly used for fixing the position and is connected to the support cylinder 2 through the first connecting member 5 or the second connecting member 6 to ensure that it can be relatively fixed with the support cylinder 2 under the push of the telescopic cylinder 3. Then, based on the above structure, the fixed sleeve 41 is further connected with a positioning sleeve 42 on the side close to the limiting sleeve 1 through a penetrating connecting rod 43, and the positioning sleeve 42 can allow the steel strand to pass through, and the steel strand 7 will be fixed at this position.

[0052] It should be noted that in the above structure, the positioning sleeve 42 and the fixed sleeve 41 are not in contact, and an adjusting pressure plate 44 is provided between the two. The adjusting pressure plate 44 is connected to the fixed sleeve 41 through a telescopic push rod 46, and the distance between the adjusting pressure plate 44 and the positioning sleeve 42 can be adjusted. Since the positioning sleeve 42 is fixed in position, after adjustment, the distance between the adjusting pressure plate 44 and the positioning sleeve 42 will change, thereby generating a driving force. For this reason, the positioning sleeve 42 is circumferentially provided with a plurality of locking plug plates 45 around the central axis. The two ends of the locking plug plate 45 respectively penetrate from the inner wall of the positioning sleeve 42 and a side close to the adjusting pressure plate 44, and the locking plug plate 45 can be pushed and moved by the adjusting pressure plate 44, and the moving direction is inclined to the central axis position of the positioning sleeve 42, and as shown in FIG. Fig.14As shown, when the upper end of the locking plate 45 is pressed downward, the lower end will move toward the direction close to the central axis of the positioning sleeve 42, thereby adjusting the outer extension of the locking plate 45 on the inner wall of the positioning sleeve 42.

[0053] Therefore, it can be seen that by driving the adjustment pressure plate 44 to change its position, the locking plug plate 45 can be pressed down, thereby moving it toward the central axis of the positioning sleeve 42, thereby clamping the steel strand 7 therein. In this way, it can be applicable to steel strands 7 of different specifications and diameters, and has strong applicability. It can also be fixed selectively, and after being released, it will not be fixed relative to the steel strand 7 during the tensioning process. For this reason, it should be noted that the above-mentioned locking plug plates 45 need to be arranged in plurality around the central axis of the positioning sleeve 42.

[0054] In order to avoid mutual influence between the structural parts, the through-connecting rod 43 and the telescopic push rod 46 are arranged in a staggered manner, and the through-connecting rod 43 and the locking plug plate 45 are arranged in a staggered manner. Therefore, through the above structure, it can be achieved that by controlling the telescopic push rod 46, the current selective locking sleeve 4 and the steel strand 7 can be controlled to be fixed or relatively moved. In order to increase the friction force, the side of the above locking plug plate 45 close to the steel strand 7 can also be set to a rough surface.

[0055] The above structure is only applicable to a whole bundle of steel strands 7 with different diameters arranged in a fixed manner, and cannot be used for steel strands 7 with different spacings between each other. Therefore, as a preferred embodiment, on the basis of the above structure, further:

[0056] The first connecting member 5 is configured to be a structure capable of adjusting the position of the selective locking sleeve 4, and as Figure 8 The specific structure of the first connecting member 5 is shown as follows: the first connecting member 5 includes a guide rod 51 and a threaded rod 52 connected to the fixed sleeve 41, and the guide rod 51 and the threaded rod 52 are penetrated from the mounting hole 21 of the side wall of the support cylinder 2, and the penetration direction is horizontal and passes through the central axis of the support cylinder 2. Then, the threaded rod 52 is provided with an adjustment nut 53 on the outside of the support cylinder 2. By screwing the adjustment nut 53, the position can be adjusted, so as to be suitable for the adaptation of steel strands 7 with different spacings. It should be noted that the position of the adjustment nut 53 is fixed, that is, it can only rotate but cannot move, so as to ensure that it is a position fixing member. After it rotates, the position of the threaded rod 52 can move. The best way is to set it as a structure that is rotationally fixedly connected to the side wall of the support cylinder 2, and in order to facilitate the observation of the position of the selective locking sleeve 4, the side wall of the guide rod 51 can be provided with a scale to facilitate the staff to confirm the position.

[0057] like Figure 1-2As shown, it can be seen that the selective locking sleeve 4 is aimed at the states of the steel strands 7 with different spacings. After adjusting the position, the selective locking sleeve 4 can be aligned with the steel strand 7 to ensure that it is a straight line in the rope pulling state.

[0058] It can be seen that since the steel strand 7 is necessarily arranged at the center position, the position of the selective locking sleeve 4 at the middle position does not need to be changed. Fig. 9 As shown, the specific structure of the second connecting member 6 is that the second connecting member 6 is connected to the fixed sleeve 41 and is detachably connected to the top hole 23 of the support cylinder 2 by bolts, and the second connecting member 6 is provided with a clearance hole 61 at the position of the steel strand 7. Its position does not need to be changed, and when it is installed, other selective locking sleeves 4 cannot be removed, and when it is removed, other selective locking sleeves 4 can be removed from the position of the support cylinder 2 by virtue of the position it has given up, and a single selective locking sleeve 4 can be replaced after damage occurs.

[0059] The above structure can be used to cope with the use of steel strands 7 of different specifications. In addition to the selective locking sleeve 4 at the center, the spacing of other selective locking sleeves 4 relative to the central axis of the support cylinder 2 can be adjusted. The adjustment method can be used to cope with the use of steel strands 7 with different spacings, and can also be used for steel strands 7 with different diameters.

[0060] In summary, in the above structure, 7 selective locking sleeves 4 are provided, and the selective locking sleeve 4 at the center position is coaxially arranged with the anchor seat 8, and is detachably connected to the support cylinder 2 through the second connecting member 6, and the selective locking sleeves 4 at other positions are circumferentially arranged around the central axis of the support cylinder 2, and are detachably connected to the support cylinder 2 through the first connecting member 5. When there are too many steel strands 7, the situation is more complicated, and it is generally not necessary to perform tensioning detection on each steel strand 7 in turn. Therefore, this device is only adapted for 7 or less steel strands 7.

[0061] In view of the above device, a building slow-bonding prestress detection system is also disclosed, which uses the above building slow-bonding prestress detection device and includes a main control terminal, the input end of the main control terminal is connected to the displacement sensor, and the output end of the main control terminal is connected to the telescopic push rod 46 and the telescopic oil cylinder 3. Compared with the original main control terminal, it has a plurality of telescopic push rods 46 as output sources, so as to facilitate the locking connection of the required steel strands 7 according to the needs.

[0062] Finally, a method for using a building slow-bonding prestress detection system is provided, which uses the above-mentioned building slow-bonding prestress detection system and includes the following steps:

[0063] S1. Install the prestress detection device, connect the limit sleeve 1 with the anchor seat 8, then adjust the first connecting member 5 according to the spacing of the steel strands 7 (turn the corresponding adjusting nut 53 to adjust to the relative position) to align the selective locking sleeve 4 with the steel strands 7, and pass the steel strands 7 through each selective locking sleeve 4;

[0064] S2, slow bonding prestress detection of a single steel strand 7, the main control terminal drives all telescopic push rods 46 of any selective locking sleeve 4, drives the adjustment plate 44 to move toward the positioning sleeve 42, and makes the locking plug plate 45 move like the steel strand 7 until the current selective locking sleeve 4 is fixed to the steel strand 7, then the main control terminal drives the telescopic cylinder 3 and records the value of the displacement sensor until one detection is completed and stops, repeating multiple times until all steel strands 7 are detected, the detection process and detection method have not been modified, so they will not be repeated;

[0065] S3, slow bonding prestress detection of the whole bundle of steel strands 7, the main control terminal drives all telescopic push rods 46 to fix all selective locking sleeves 4 and steel strands 7, and then the main control terminal drives the telescopic cylinder 3 and records the value of the displacement sensor until one detection is completed and then stops;

[0066] S4, dismantle the detection device, reset the telescopic push rod 46 and the telescopic oil cylinder 3, dismantle the supporting cylinder 2 and its connecting structure from the steel strand 7, and then dismantle the limit sleeve 1.

[0067] Through the above method, it can be seen that compared with the existing method that requires frequent manual switching between the steel strands 7, the present device only needs to be fixed once to complete all detection operations.

[0068] According to different requirements, the method further includes the following steps after step S3:

[0069] For the slow-bonding prestress detection of multiple steel strands 7, the main control terminal drives any number of telescopic push rods 46 to fix any number of selective locking sleeves 4 to the steel strands 7, and then the main control terminal drives the telescopic oil cylinder 3 and records the value of the displacement sensor until one detection is completed and stops. Compared with the existing equipment, this device can also perform prestress detection on multiple steel strands 7 at the same time, and this method is different from a single strand and a whole bundle. The number and position of the steel strands 7 that need to be tensioned can be freely selected, so the degree of freedom is higher, which is impossible to achieve with the existing reverse tension detection equipment.

Claims

1. A building slow-bonding prestress detection device, characterized in that: It comprises a limiting sleeve (1) sleeved on an anchor seat (8), a supporting cylinder (2) being arranged on a side of the limiting sleeve (1) away from the anchor seat (8), the supporting cylinder (2) being arranged coaxially with the anchor seat (8), and a plurality of telescopic cylinders (3) being arranged circumferentially on the outer wall, the output end of the telescopic cylinder (3) being arranged perpendicular to the limiting sleeve (1) so as to be able to adjust the distance between the limiting sleeve (1) and the supporting cylinder (2); A plurality of selective locking sleeves (4) cooperating with the steel strand (7) are arranged inside the support cylinder (2), and each selective locking sleeve (4) is penetrated by a single steel strand (7). The selective locking sleeve (4) can freely switch the connection state with the steel strand (7), that is, it can be locked relative to the steel strand (7) and can move relative to the steel strand (7); A displacement sensor is also provided on the outside of the support cylinder (2) to monitor the linear distance between the support cylinder (2) and the limit sleeve (1); The selective locking sleeve (4) at the center position is coaxially arranged with the anchor seat (8) and is detachably connected to the support cylinder (2) via a second connecting member (6); the selective locking sleeves (4) at other positions are circumferentially arranged around the center axis of the support cylinder (2) and are detachably connected to the support cylinder (2) via a first connecting member (5); The selective locking sleeve (4) comprises a fixed sleeve (41), the fixed sleeve (41) being connected to a positioning sleeve (42) on a side close to the limiting sleeve (1) through a connecting rod (43), the positioning sleeve (42) and the fixed sleeve (41) not being in contact, and an adjusting pressure plate (44) being arranged between the two, the adjusting pressure plate (44) being connected to the fixed sleeve (41) through a telescopic push rod (46), and being capable of adjusting the spacing with the positioning sleeve (42), the positioning sleeve (42) being circumferentially arranged with a plurality of locking plug plates (45) around a central axis, the two ends of the locking plug plates (45) respectively penetrating from the inner wall of the positioning sleeve (42) and a side close to the adjusting pressure plate (44), and the locking plug plates (45) being capable of being pushed and moved by the adjusting pressure plate (44), thereby adjusting the outer extension of the locking plug plates (45) on the inner wall of the positioning sleeve (42).

2. A building slow-bonding prestress detection device according to claim 1, characterized in that: The number of the selective locking sleeves (4) is 7.

3. A building slow-bonding prestress detection device according to claim 2, characterized in that: Except for the selective locking sleeve (4) at the center position, the spacings of the other selective locking sleeves (4) relative to the center axis of the support cylinder (2) can be adjusted.

4. A building slow-bonding prestress detection device according to claim 2, characterized in that: The first connecting member (5) comprises a guide rod (51) and a threaded rod (52) connected to the fixing sleeve (41), and the guide rod (51) and the threaded rod (52) both penetrate through the mounting hole (21) on the side wall of the supporting cylinder (2), and the threaded rod (52) is provided with an adjusting nut (53) on the outside of the supporting cylinder (2).

5. A building slow-bonding prestress detection device according to claim 2, characterized in that: The second connecting member (6) is connected to the fixing sleeve (41) and is detachably connected to the top hole (23) of the supporting cylinder (2) via bolts. The second connecting member (6) is provided with a clearance hole (61) at the position of the steel strand (7).

6. A building slow-bonding prestress detection device according to claim 2, characterized in that: The through-connecting rods (43) and the telescopic push rods (46) are arranged in a staggered manner, and the through-connecting rods (43) and the locking plug plates (45) are arranged in a staggered manner.

7. A building slow-bonding prestress detection system, characterized in that: A building slow-bonding prestress detection device according to any one of claims 2 to 6 is used, and comprises a main control terminal, wherein the input end of the main control terminal is connected to a displacement sensor, and the output end of the main control terminal is connected to a telescopic push rod (46) and a telescopic cylinder (3).

8. A method for using a building slow-bonding prestress detection system, characterized in that: A building slow-bonding prestress detection system according to claim 7 is used, and comprises the following steps: S1. Install the prestress detection device, connect the limit sleeve (1) with the anchor seat (8), then adjust the first connecting member (5) according to the spacing of the steel strands (7) so that the selective locking sleeve (4) is aligned with the steel strands (7), and the steel strands (7) are passed through each selective locking sleeve (4); S2, slow-bonding prestressing test of a single steel strand (7), the main control terminal drives any telescopic push rod (46) to fix the currently selected locking sleeve (4) and the steel strand (7), and then the main control terminal drives the telescopic oil cylinder (3) and records the value of the displacement sensor until one test is completed and then stops, and repeats multiple times until all the steel strands (7) are tested; S3, slow-bonding prestressing test of the whole bundle of steel strands (7), the main control terminal drives all telescopic push rods (46) to fix all selective locking sleeves (4) and the steel strands (7), and then the main control terminal drives the telescopic oil cylinder (3) and records the value of the displacement sensor until one test is completed and then stops; S4, dismantle the detection device, reset the telescopic push rod (46) and the telescopic oil cylinder (3), remove the supporting cylinder (2) and its connecting structure from the steel strand (7), and then remove the limit sleeve (1).

9. The method for using the building slow-bonding prestress detection system according to claim 8, characterized in that: After step S3, the method further includes the following steps: In the detection of slow-bonding prestress of a plurality of steel strands (7), the main control terminal drives any number of telescopic push rods (46) to fix any number of selective locking sleeves (4) to the steel strands (7), and then the main control terminal drives the telescopic oil cylinder (3) and records the value of the displacement sensor until one detection is completed and then stops.

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