CN111733900A - High strain detection method for prestressed foundation pile - Google Patents
High strain detection method for prestressed foundation pile Download PDFInfo
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- CN111733900A CN111733900A CN202010583618.0A CN202010583618A CN111733900A CN 111733900 A CN111733900 A CN 111733900A CN 202010583618 A CN202010583618 A CN 202010583618A CN 111733900 A CN111733900 A CN 111733900A
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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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Abstract
The invention belongs to the technical field of prestressed foundation pile detection, and discloses a high strain detection method for a prestressed foundation pile, which aims to solve the problems of eccentric hammering and large potential safety hazard caused by easy toppling of a heavy hammer after falling in the conventional high strain detection device. The guide frame is fixed by fully utilizing the existing prestressed foundation pile, so that the problem that the guide frame cannot be stabilized in field construction and has larger potential safety hazard is solved; meanwhile, the guide frame is fixed on the prestressed foundation pile through the clamping device, and the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line, so that the heavy hammer can be hammered at the central position of the prestressed foundation pile after falling freely, eccentric hammering is prevented, numerical values of sensors on two sides of the prestressed foundation pile are very close, data are conveniently analyzed, the real bearing capacity and integrity of the prestressed foundation pile are obtained, and the detection precision of the prestressed foundation pile is improved.
Description
Technical Field
The invention belongs to the technical field of prestressed foundation pile detection, and particularly relates to a high strain detection method for a prestressed foundation pile.
Background
The high strain detection is a detection method for judging the vertical compression bearing capacity and the integrity of a single pile body, a heavy hammer (the weight is 1% -1.5% of the estimated single pile limit bearing capacity) is used for impacting a pile top in an experiment, so that the prestressed foundation pile can generate enough penetration, the response of the mass point stress and the acceleration of the pile body generated by the actual measurement is carried out, and the vertical bearing capacity and the integrity of the pile body of the single pile are judged through fluctuation theoretical analysis. The top of the pile is impacted by a heavy hammer to generate enough relative displacement between the pile and the soil so as to fully excite the soil resistance around the pile and the bearing force at the pile end. At present, the main detection methods of the high strain of the prestressed foundation pile mainly comprise a Keys method (Case), a CAPWAPC method, a waveform fitting method, a wave equation method and the like.
The invention discloses a prestressed foundation pile high-strain detection vehicle mainly comprising a tripod (or a quadruped) lifting and a crane (or a vehicle) lifting, for example, the invention patent with the application number of 201811116398.X discloses a prestressed foundation pile high-strain detection vehicle, which comprises a vehicle body, a heavy hammer, a spring acceleration device and a winch, wherein a rectangular opening is arranged at the tail end of a chassis of the vehicle body, rectangular guide frames are arranged at the left end and the right end of the rectangular opening, each guide frame comprises a cross beam and two vertically arranged support columns, an electrohydraulic telescopic rod is arranged at the top end of each support column, the electrohydraulic telescopic rods are connected with two ends of the cross beam of the guide frame, a vertically downward round rod is arranged at the center of the cross beam, the spring acceleration device comprises an upper spring seat, a lower spring seat, a telescopic upright post and a spring, first round through hole is arranged at the centers of the upper spring seat and the lower spring seat, the, the upper spring seat and the lower spring seat are fixedly connected in parallel in the horizontal direction through a plurality of telescopic stand columns, a first circular through hole of the upper spring seat and a first circular through hole of the lower spring seat are in the same straight line in the same vertical direction, a plurality of springs are connected between the upper spring seat and the lower spring seat, and a first circular through hole of the spring accelerating device is sleeved on the round rod and is installed on the bottom surface of the cross beam.
For example, utility model patent application No. 201520897072.0 discloses a prestressing force foundation pile height meets an emergency and detects isolated plant, including pile head fixing device, the vertical leading truck that sets up on pile head fixing device, it has direction drop hammer rolling device to be located the leading truck in proper order, the combination formula tup, automatic unhook device and electric hoist device, electric hoist device sets up the top at the leading truck, be connected with automatic unhook device between direction drop hammer rolling device and the automatic unhook device, the combination formula tup is built-in the leading truck, by a plurality of steel sheets, hammer bottom plate and hammer top plate are constituteed, the steel sheet is laid on the hammer bottom plate, be located the round hole that every steel sheet and hammer bottom plate surface have the same position, the round hole inserts on the connecting rod, the tip of connecting rod enlarges and is connected with the round hole zonulae occludens of hammer bottom plate, the afterbody of connecting rod spreads into the.
The utility model patent with application number 201420873649.X discloses a high strain detection hammering device for a prestressed foundation pile, which comprises a guide frame, a hammer body arranged in the guide frame and a hook mechanism connected with the hammer body, wherein the guide frame comprises a hollow cone platform and a support frame extending along the vertical direction of the hollow cone platform, and the cross sectional area of the top end of the hollow cone platform is equal to that of the bottom end of the support frame; the hammer body moves up and down in the guide frame under the traction of the hook mechanism; the hook mechanism is connected with a first steel wire rope and a second steel wire rope respectively, wherein the first steel wire rope is connected with the crane, and the second steel wire rope is connected with an adjusting mechanism used for triggering unhooking of the hook machine head.
However, the conventional detection device has the following problems in use:
1. the problem of eccentric hammering is easily caused by hoisting by using a crane or a crane, so that the data difference detected by the sensors at the left side and the right side of the prestressed foundation piles at the two sides is large;
2. the lifting height of the heavy hammer in the prior art is generally 20-50cm, which causes that the prestressed foundation pile is difficult to be driven, so that the penetration degree of the prestressed foundation pile is insufficient, the height of the heavy hammer has to be increased in order to achieve sufficient hammering force, however, the falling and falling of the heavy hammer are easy to cause the falling and falling of the guide frame (or also called foot rest, support frame and fixed frame) along with the lifting of the height of the heavy hammer, and great potential safety hazards are brought to workers and instruments.
Disclosure of Invention
The invention provides a high-strain detection method for a prestressed foundation pile, aiming at solving the problems of eccentric hammering and large potential safety hazard caused by easy toppling of a heavy hammer after falling of the existing high-strain detection device, and being capable of ensuring that the problem of eccentric hammering does not occur in the hammering process, so that the data of sensors at two sides of the prestressed foundation pile is more real, and the accuracy of the data is improved; meanwhile, the falling of the heavy hammer can be prevented, and the falling of the heavy hammer can not cause the falling of the guide frame (or also called a foot rest, a support frame and a fixed frame), so that the safety of workers and related instruments and equipment can be guaranteed.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
a high strain detection method for a prestressed foundation pile is characterized by comprising a high strain detection device for the prestressed foundation pile, wherein the high strain detection device for the prestressed foundation pile comprises a guide frame, the guide frame is sequentially provided with a clamping device, a heavy hammer, an automatic tripping device and a lifting device from bottom to top, the heavy hammer is detachably connected with the automatic tripping device, the upper end of the automatic tripping device is connected with the lifting device arranged at the upper end of the guide frame, the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line, the upper end of the guide frame is provided with at least three first spherical hinge seats, each first spherical hinge seat is not arranged on the same straight line, the ball head of each first spherical hinge seat is connected with a first telescopic piece with adjustable length, one end of each first telescopic piece is connected with the ball head of the first spherical hinge seat, the other end of the first telescopic piece is connected with a ball head of a second spherical hinge seat, and the second spherical hinge seat is detachably connected with an embedded anchor bolt of the prestressed foundation pile; the detection method comprises the following steps:
(1) placing the guide frame on a prestressed foundation pile prepared for high strain detection:
(2) clamping the clamping device on a prestressed foundation pile ready for high strain detection;
(3) connect first extensible member on the first spherical articulated seat of leading truck upper end:
(4) installing second spherical hinged seats on the rest prestressed foundation piles at the periphery of the prestressed foundation pile ready for high strain detection:
(5) connecting the first telescopic piece to the second spherical hinge seat, and adjusting the length of the first telescopic piece to enable the first telescopic piece to be tensioned;
(6) the lifting device drives the automatic unhooking device and the heavy hammer to rise until a handle of the automatic unhooking device touches the transverse plate or the transverse bar;
(7) and the heavy hammer is separated from the automatic unhooking device and freely falls down to hammer the prestressed foundation pile.
In some embodiments, the lower end of the guide frame is provided with at least three third spherical hinge seats, each third spherical hinge seat is not arranged on the same straight line, and the third spherical hinge seats are detachably connected with the first telescopic piece or the second spherical hinge seat through a second telescopic piece with adjustable length; the detection method further comprises the following steps:
and (5) connecting a third spherical hinged seat at the lower end of the guide frame with a second telescopic piece between the step (5) and the step (6), connecting the second telescopic piece with the first telescopic piece or the second spherical hinged seat, and adjusting the length of the second telescopic piece to enable the second telescopic piece to be tensioned.
In some embodiments, at least two guiding devices are disposed on the periphery of the weight, and a guiding groove which is matched with the guiding device and is disposed along the vertical direction is disposed inside the guiding frame, and the guiding device extends into the guiding groove.
In some embodiments, the guide means is a guide pulley or block that extends into the guide slot.
In some embodiments, a sliding groove is arranged on the guide frame, a sliding block is arranged in the sliding groove, the sliding block can slide in the sliding groove and can be locked in the sliding groove, and a baffle or a stop bar used for contacting with a handle of the automatic unhooking device so as to trigger the heavy hammer to be detached from the automatic unhooking device is arranged on the sliding block;
and (4) before the step (6), adjusting the height position of the upper transverse plate or the transverse bar of the guide frame according to the set falling height of the heavy hammer.
In some embodiments, the upper end and the lower end of the guide frame are respectively provided with a fixed plate, the fixed plate is provided with a sliding groove, the sliding groove is provided with a sliding block, the sliding block can slide in the sliding groove and can be locked in the sliding groove, and the first spherical hinge seat and the third spherical hinge seat are respectively fixedly arranged on the sliding block at the upper end of the guide frame and the sliding block at the lower end of the guide frame;
before the first spherical hinged seat is connected with the first telescopic piece, the position of the sliding block in the sliding groove is adjusted and the sliding block is locked in the sliding groove according to the distribution condition of the prestressed foundation piles for mounting the second spherical hinged seat.
In some embodiments, the first and second telescopic parts each include a first connecting rod and a second connecting rod, the first and second connecting rods are connected with the adjusting cylinder, the first and second connecting rods are both connected with the adjusting cylinder through threads, and the length of the first and second connecting rods extending into the adjusting cylinder is adjusted through threads.
In some embodiments, the adjusting cylinder includes a cylinder body, the cylinder body is provided with a through hole for accommodating the first connecting rod and the second connecting rod, two sections of first thread section and second thread section with opposite spiral directions are processed in the through hole, the first connecting rod is in threaded connection with the first thread section, and the second connecting rod is in threaded connection with the second thread section.
In some embodiments, the adjusting cylinder comprises a cylinder body, the cylinder body is provided with a through hole for accommodating the first connecting rod and the second connecting rod, two ends of the cylinder body are respectively connected with an end cover in a rotating manner, and the end cover is provided with a threaded hole in threaded connection with the first connecting rod and the second connecting rod.
In some embodiments, the adjusting cylinder includes a cylinder body, the cylinder body is provided with a through hole for accommodating the first connecting rod and the second connecting rod, two ends of the cylinder body are respectively and fixedly connected with an end cover, the first connecting rod and the second connecting rod respectively penetrate through the end cover and extend into the cylinder body and are respectively provided with a first adjusting nut and a second adjusting nut, and the cylinder body is provided with a movable space for rotating the first adjusting nut and the second adjusting nut.
Compared with the prior art, the invention has the following beneficial effects:
when the method for detecting the high strain of the prestressed foundation pile is used, the guide frame is fixed on the prestressed foundation pile (the prestressed foundation pile to be subjected to high strain detection) through the clamping device, the axis of the prestressed foundation pile and the axis of the free falling weight are on the same straight line, the first spherical hinge seat at the upper end of the guide frame is connected with the first telescopic piece, the first telescopic piece is connected with the second spherical hinge seats arranged on the other prestressed foundation piles (the prestressed foundation piles which are not subjected to high strain detection), so that the upper end of the guide frame is fixed along different positions, finally, the third spherical hinge seat at the lower end of the guide frame is connected with the second telescopic piece, the second telescopic piece is connected with the second spherical hinge seats arranged on the other prestressed foundation piles or is connected with the first telescopic piece, the lengths of the first telescopic piece and the second telescopic piece are adjusted, make first extensible member and the tensioning of second extensible member to stabilize the leading truck, prevent that the emergence of empting from appearing in the leading truck, ensured staff and instrument and equipment's safety. The invention fully utilizes the existing prestressed foundation piles (engineering piles) to fix the guide frame, and solves the problem that the guide frame cannot be stabilized in field construction and has larger potential safety hazard.
The guide frame is clamped at the periphery of the prestressed foundation pile through the clamping device, and the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line, so that the heavy hammer can be hammered at the central position of the prestressed foundation pile after falling freely, eccentric hammering is prevented, the numerical values of the sensors at two sides of the prestressed foundation pile are very close to (even identical to) each other, four data (two speed curves and two force signal curves) of the prestressed foundation pile are measured, the difference between the amplitudes of the two side force signals collected by the two force sensors is smaller than 1 time, fitting analysis of the collected speed curves and force signal curves is facilitated, the ultimate bearing capacity and pile body integrity of the prestressed foundation pile are accurately detected, and the accuracy of detecting the bearing capacity and pile body integrity of the prestressed foundation pile is improved.
According to the invention, the guide device is arranged outside the heavy hammer, and the guide groove is arranged on the guide frame, so that the heavy hammer can be corrected in time when inclined in the falling process, and the eccentric hammering condition is further prevented.
The invention is characterized in that a sliding groove is arranged on a guide frame, a sliding block is arranged in the sliding groove, the sliding block can slide in the sliding groove and can be locked in the sliding groove, a baffle or a stop strip which is used for being in mutual contact with a handle of an automatic unhooking device to trigger a heavy hammer to be separated from the automatic unhooking device is arranged on the sliding block, so that the position of the sliding block in the sliding groove can be firstly adjusted according to the condition of a prestressed foundation pile (namely, the falling height of the heavy hammer is determined), when the lifting device drives the automatic unhooking device and the heavy hammer to rise, and the handle is pressed down under the action of the baffle or the stop strip to separate the heavy hammer from the automatic unhooking device when the handle of the automatic unhooking device is in contact with the baffle or the stop strip, thereby achieving the purpose of controlling the rising height of the heavy hammer, the invention can realize the automatic separation and falling of, compared with the prior art, the novel multifunctional electric wrench has the advantages that the manual pulling or knocking mode is adopted, the manual pulling or knocking handle of a worker is not needed, the labor intensity of the worker is reduced, and meanwhile the potential safety hazard of the worker is also reduced.
According to the invention, the fixed plates are arranged at the upper end and the lower end of the guide frame, the sliding chute is arranged on the fixed plates, the sliding chute is provided with the sliding block, the first spherical hinge seat is arranged on the sliding block at the upper end of the guide frame, and the third spherical hinge seat is arranged on the sliding block at the lower end of the guide frame, so that the positions of the first spherical hinge seat and the third spherical hinge seat on the guide frame can be adjusted, the fixed position of the guide frame can be flexibly adjusted according to the distribution condition of the prestressed foundation piles (the prestressed foundation piles without high strain detection), and the fixing flexibility of the high strain detection device is improved.
The first telescopic piece and the second telescopic piece of the invention realize adjustable change of length through adjustment between the adjusting cylinder and the first connecting rod and the second connecting rod, thereby facilitating reasonable adjustment according to the distribution condition of prestressed foundation piles (prestressed foundation piles without high strain detection) on a construction site, improving the use flexibility of the invention and meeting the stability of a detection device under different conditions.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a portion A of FIG. 1;
FIG. 3 is a schematic enlarged view of a portion B of FIG. 1;
FIG. 4 is a schematic view of the installation of one embodiment of the automatic unhooking apparatus of the present invention;
FIG. 5 is a schematic view of the connection of the first and second tie rods to an embodiment of the adjustment cylinder according to the present invention;
FIG. 6 is a schematic view of the connection of the first and second tie rods to an embodiment of the adjustment cylinder according to the present invention;
FIG. 7 is a schematic view of the connection between the end cap and the snap ring of FIG. 6;
FIG. 8 is a schematic view of the connection of the first and second tie rods to an embodiment of the adjustment cylinder according to the present invention;
FIG. 9 is a schematic structural view of an embodiment of the first and second links of the present invention;
FIG. 10 is a schematic structural view of an embodiment of the first and second links of the present invention;
FIG. 11 is a schematic structural view of an embodiment of a clamping device of the present invention;
FIG. 12 is a schematic structural diagram of an embodiment of a clamping device of the present invention;
FIG. 13 is a schematic structural diagram of an embodiment of a clamping device of the present invention;
the labels in the figure are: 1. guide frame, 2, clamping device, 21, left arc-shaped block, 22, right arc-shaped block, 23, adjusting screw, 24, fixing ring, 25, adjusting end cover, 26, through hole, 3, weight, 4, automatic unhooking device, 41, lifting lug, 42, hanging plate, 43, handle, 44, wedge-shaped press block, 45, pin shaft, 46, left clamping block, 47, right clamping block, 48, clamping groove, 5, lifting device, 51, winding machine, 52, steel rope, 6, first spherical hinge seat, 61, fixing plate, 62, sliding groove, 63, sliding block, 64, strip-shaped groove, 65, fastening bolt, 7, first telescopic piece, 71, first connecting rod, 711, first connecting section, 712, second connecting section, 713, connecting rope, 72, adjusting cylinder, 721, cylinder body, 722, through hole, 723, first thread section, 724, second thread section, 725, end cover, 726, snap ring, 727, clamping groove, 728, clamping groove, 728, and clamping groove, First adjusting nut, 729, second adjusting nut, 7210, activity space, 73, second connecting rod, 8, the articulated seat of second sphere, 9, the articulated seat of third sphere, 10, the second extensible member, 11, baffle or blend stop, 1101, mounting panel, 1102, sliding tray, 1103, sliding block, 1104, guide way.
Detailed Description
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
With reference to fig. 1, the method for detecting high strain of a prestressed foundation pile of the present invention includes a prestressed foundation pile high strain detection device, the prestressed foundation pile high strain detection device includes a guiding frame 1 (or referred to as a fixed frame, a supporting frame), the guiding frame 1 is sequentially provided with a clamping device 2 for clamping a prestressed foundation pile, a heavy hammer 3, an automatic tripping device 4 and a lifting device 5 from bottom to top, the heavy hammer 3 is detachably connected to the automatic tripping device 4, the upper end of the automatic tripping device 4 is connected to the lifting device 5 mounted on the upper end of the guiding frame 1, the vertical center line of the clamping device 2 and the vertical center line of the heavy hammer 3 are on the same straight line, the upper end of the guiding frame 1 is provided with at least three first spherical hinge seats 6, each first spherical hinge seat 6 is not mounted on the same straight line, the ball head of each first spherical hinge seat 6 is connected to a first telescopic member 7 capable of adjusting length, one end of the first telescopic part 7 is connected with a ball head of the first spherical hinge seat 6, the other end of the first telescopic part 7 is connected with a ball head of the second spherical hinge seat 8, and the second spherical hinge seat 8 is detachably connected with an embedded anchor bolt of the prestressed foundation pile;
the detection method comprises the following steps:
(1) placing the guide frame on a prestressed foundation pile prepared for high strain detection:
(2) clamping the clamping device on a prestressed foundation pile ready for high strain detection;
(3) connect first extensible member on the first spherical articulated seat of leading truck upper end:
(4) installing second spherical hinged seats on the rest prestressed foundation piles at the periphery of the prestressed foundation pile ready for high strain detection:
(5) connecting the first telescopic piece to the second spherical hinge seat, and adjusting the length of the first telescopic piece to enable the first telescopic piece to be tensioned;
(6) the lifting device drives the automatic unhooking device and the heavy hammer to rise until a handle of the automatic unhooking device touches the transverse plate or the transverse bar;
(7) and the heavy hammer is separated from the automatic unhooking device and freely falls down to hammer the prestressed foundation pile.
Before step (1) is carried out, sensors (accelerometers, stress rings) and detection equipment should be installed according to the building prestressed foundation pile detection technical specification (JGJ 106-; for the precast pile which is detected after the pile head is cut off or broken, the exposed reinforcing steel bars need to be cut off or a layer of high-strength early-strength cement needs to be coated again to enable the pile head to be flat. For filling piles, long pile caps or short pile caps can be manufactured.
The installation of the sensor should be symmetrically selected at the same height position of two sides of the pile, and when the sensor is installed, the sensor should be dug by repeatedly using a hammer around the pile with the suitable installation height to find a flat plane with less protrusions and less soft mortar. Wherein the pile head handling and sensor installation are well within the skill of the art and will be understood and appreciated by those skilled in the art and will not be described in detail herein.
The guide frame 1 can adopt a columnar structure formed by welding angle steels or connecting threads, and the guide frame 1 can be in a cuboid shape, or a hexagonal prism, an octagonal prism or a polygonal prism which is formed by more than 8 sides and even number of sides. In some embodiments, the upper end of each side of the guide frame is fitted with one or more first spherical hinge seats 6, for example, when the guide frame is hexagonal prism shaped, each of the six sides of the guide frame is fitted with at least one first spherical hinge seat 6; when the guide frame is in the shape of a rectangular parallelepiped, each of the four faces of the guide frame is fitted with at least one first spherical hinge seat 6, so as to be fixed from each direction of the guide frame 1. In order to reduce the manufacturing cost of the guide frame 1 during the construction, the guide frame is preferably designed to be rectangular parallelepiped so that the guide frame 1 capable of accommodating the weight 3, the clamping device 2, and the like can be manufactured using a small amount of material.
As a preferred mode of the present invention, at least three first spherical hinge seats 6 are installed on the guiding frame 1, and the three first spherical hinge seats 6 are not collinear any more, so that the three first spherical hinge seats 6 form a triangle shape, and are respectively fixed on the prestressed foundation piles at different positions in different directions through the first spherical cross-connecting seat 6, the first telescopic member 7 and the second spherical cross-connecting seat 8, thereby ensuring the fixing stability of the guiding frame 1.
It should be noted that the clamping device 2 of the present invention is used for clamping a prestressed foundation pile for high strain detection on the ground, and the second spherical hinge seat 8 is installed on the remaining prestressed foundation piles, and since the number of the prestressed foundation piles is arranged in a construction site, the second spherical hinge seat 8 is installed on the prestressed foundation pile, so that the guide frame 1 can be fixed by fully utilizing the conditions of the construction site.
The lifting device 5 described in the present invention may adopt a structure of a winch 51 and a steel rope 52, that is, the winch is installed at the upper end of the guide frame 1, the end of the steel rope 52 wound on the winch 51 is connected with the automatic unhooking device 4, and the automatic unhooking device 4 is connected with the heavy hammer 3, so that the heavy hammer is lifted by the winch 51, thereby facilitating high strain detection of the prestressed foundation pile.
The lifting device 5 of the present invention can also use a hydraulic cylinder to lift the automatic unhooking device 4 and the weight 3, and will not be described herein. Preferably, in order to adapt to the severe construction environment in the field, the hoisting device 5 preferably adopts a winch with simple structure and reliable performance.
In some embodiments, the lower end of the guiding frame 1 is provided with at least three third spherical hinge seats 9, each third spherical hinge seat 9 is not installed on the same straight line, the third spherical hinge seat 9 is detachably connected with the first telescopic part 7 or the second spherical hinge seat 8 through a second telescopic part 10 with adjustable length, that is, one end of the second telescopic part can be connected to the first telescopic part, the other end of the second telescopic part can be connected to the second spherical hinge seat, and the installation stability of the guiding frame 1 can be further improved through the third spherical hinge seats 9 and the second telescopic part 10. Wherein the spherical hinge seats (including the first spherical hinge seat 6, the second spherical hinge seat 8 and the third spherical hinge seat 9) belong to the prior art products, and can be understood and understood by those skilled in the art, and are not described herein.
When the third spherical hinged seat is installed at the lower end of the guide frame, the second telescopic piece is connected with the third spherical hinged seat at the lower end of the guide frame between the step (5) and the step (6), the second telescopic piece is connected with the first telescopic piece or the second spherical hinged seat, and the length of the second telescopic piece is adjusted to enable the second telescopic piece to be tensioned.
The third spherical cross-connecting seat 9 is installed in the same way as the first spherical hinge seat 6, and at least one third spherical hinge seat can be installed on each surface of the lower end of the guide frame. The third spherical hinge seat 9 may be installed directly below the first spherical hinge seat 6, and the installation position of the third spherical hinge seat 9 and the installation position of the first spherical hinge seat 6 may have a distance therebetween.
When the method for detecting the high strain of the prestressed foundation pile is used, the guide frame is clamped and fixed on the prestressed foundation pile (the prestressed foundation pile for detecting the high strain) through the clamping device, the axis of the prestressed foundation pile and the axis of the free falling weight are on the same straight line, the first spherical hinge seat at the upper end of the guide frame is connected with the first telescopic piece, the first telescopic piece is connected with the second spherical hinge seats arranged on the other prestressed foundation piles (the prestressed foundation piles which are not subjected to the high strain detection), so that the upper end of the guide frame is fixed along different positions, finally, the third spherical hinge seat at the lower end of the guide frame is connected with the second telescopic piece, the second telescopic piece is connected with the second spherical hinge seats arranged on the other prestressed foundation piles or is connected with the first telescopic piece, the lengths of the first telescopic piece and the second telescopic piece are adjusted, make first extensible member and the tensioning of second extensible member to stabilize the leading truck, prevent that the emergence of empting from appearing in the leading truck, ensured staff and instrument and equipment's safety. The invention fully utilizes the existing prestressed foundation piles (engineering piles) to fix the guide frame, and solves the problem that the guide frame cannot be stabilized in field construction and has larger potential safety hazard.
The guide frame is clamped at the periphery of the prestressed foundation pile through the clamping device, and the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line, so that the heavy hammer can be hammered at the central position of the prestressed foundation pile after falling freely, eccentric hammering is prevented, the numerical values of the sensors at two sides of the prestressed foundation pile are very close to (even identical to) each other, four data (two speed curves and two force signal curves) of the prestressed foundation pile are measured, the difference between the amplitudes of the two side force signals collected by the two force sensors is smaller than 1 time, fitting analysis of the collected speed curves and force signal curves is facilitated, the ultimate bearing capacity and pile body integrity of the prestressed foundation pile are accurately detected, and the accuracy of detecting the bearing capacity and pile body integrity of the prestressed foundation pile is improved.
With reference to fig. 2, in some embodiments, the upper end and the lower end of the guide frame 1 are respectively provided with a fixed plate 61, the fixed plate 61 is provided with a sliding slot 62, the sliding slot 62 is provided with a sliding block 63, the sliding block 63 is capable of sliding in the sliding slot 62 and capable of being locked in the sliding slot 62, the first spherical hinge seat 6 and the third spherical hinge seat 9 are respectively fixedly arranged on the sliding block 63 at the upper end of the guide frame 1 and the sliding block 63 at the lower end of the guide frame 1, and the detection method further includes: before the first spherical hinged seat is connected with the first telescopic piece, the position of the sliding block in the sliding groove is adjusted and the sliding block is locked in the sliding groove according to the distribution condition of prestressed foundation piles for mounting the second spherical hinged seat; before the third spherical hinged seat is connected with the second telescopic piece, the position of the sliding block in the sliding groove is adjusted and the sliding block is locked in the sliding groove according to the distribution condition of the prestressed foundation piles for mounting the second spherical hinged seat. Design through spout and slider makes first spherical articulated seat and third spherical articulated seat can adjust in the position of leading truck to in the fixed position of leading truck carries out nimble regulation according to prestressing force foundation pile (the prestressing force foundation pile that does not carry out high strain detection) distribution condition, thereby improves the fixed flexibility of high strain detection device.
In some embodiments, the fixing plates 61 on both sides of the sliding groove 62 are provided with strip-shaped grooves 64, the upper end surface of the sliding groove 63 covers a section of the strip-shaped groove 64, when locking is required, the locking screw sequentially penetrates through the strip-shaped grooves 64 and the sliding block 63 and is provided with a locking nut, and the sliding block 63 is fixed on the sliding groove 62 through the locking screw and the locking nut.
In some embodiments, the fixing plate 61 on both sides of the sliding groove 62 may also be provided with a plurality of through holes, and the locking screw sequentially passes through the through holes and the sliding block 63 and is provided with a locking nut, so that the position of the sliding block 63 on the sliding groove 62 is fixed by the locking screw and the locking nut.
In some embodiments, to improve the stability of the connection between the sliding block 63 and the sliding groove 62, the sliding groove 62 is designed as a dovetail groove, thereby ensuring the stable connection of the sliding block 63.
In some embodiments, the guiding frame 1 is provided with a sliding groove, a sliding block is arranged in the sliding groove, the sliding block can slide in the sliding groove and can be locked in the sliding groove, and a baffle or a stop bar 11 for contacting with a handle of the automatic unhooking device 4 to trigger the heavy hammer to be detached from the automatic unhooking device 4 is arranged on the sliding block; the detection method further comprises the following steps:
and (4) before the step (6), adjusting the height position of the upper transverse plate or the transverse bar of the guide frame according to the set falling height of the heavy hammer.
Referring to fig. 3, in some embodiments, a mounting plate 1101 is mounted on the guiding frame 1, a sliding groove 1102 is vertically formed on the mounting plate 1101, a sliding block 1103 is matched with the sliding groove 1102, and the baffle or stop bar 11 is mounted on the sliding block 1103, so as to adjust the height position of the baffle or stop bar 11. The invention is characterized in that a sliding groove is arranged on a guide frame, a sliding block is arranged in the sliding groove, the sliding block can slide in the sliding groove and can be locked in the sliding groove, a baffle or a stop strip which is used for being in mutual contact with a handle of an automatic unhooking device to trigger a heavy hammer to be separated from the automatic unhooking device is arranged on the sliding block, so that the position of the sliding block in the sliding groove can be firstly adjusted according to the condition of a prestressed foundation pile (namely, the falling height of the heavy hammer is determined), when the lifting device drives the automatic unhooking device and the heavy hammer to rise, and the handle is pressed down under the action of the baffle or the stop strip to separate the heavy hammer from the automatic unhooking device when the handle of the automatic unhooking device is in contact with the baffle or the stop strip, thereby achieving the purpose of controlling the rising height of the heavy hammer, the invention can realize the automatic separation and falling of, compared with the prior art, the novel multifunctional electric wrench has the advantages that the manual pulling or knocking mode is adopted, the manual pulling or knocking handle of a worker is not needed, the labor intensity of the worker is reduced, and meanwhile the potential safety hazard of the worker is also reduced.
In some embodiments, the mounting plate 1101 may be provided with a plurality of through holes or bar-shaped holes, and the sliding block is provided with a locking screw and a locking nut, the locking screw passes through the through holes or bar-shaped holes of the mounting plate 1101 in sequence and is fastened with the locking nut, so as to fasten the sliding block 1103 on the sliding groove 1102.
Referring to fig. 4, in some embodiments, at least two guiding devices are disposed on the periphery of the weight 3, and a guiding slot 1104 is disposed inside the guiding frame, wherein the guiding slot 1104 is vertically disposed and is engaged with the guiding devices, and the guiding devices extend into the guiding slot 1104. When the weight inclines during falling, the inclination can be corrected in time through the interaction of the guide device and the guide groove 1104, so that the eccentric hammering condition is further prevented.
In some embodiments, the guide device is a guide pulley 31 or a guide block, and the guide pulley 31 or the guide block extends into the guide groove 1104. The guide slot 1104 is formed in the mounting plate 1101, and the length of the guide slot 1104 is adapted to the drop height of the weight.
The width of the guide groove 1104 should be larger than the width of the guide pulley 31 so that the guide pulley 31 does not contact with the side wall of the guide groove 1104, and the guide pulley 31 may or may not contact with the bottom surface of the guide groove 1104.
In some embodiments, the guiding device can also be a guiding block, which is not in contact with the side wall and the bottom surface of the guiding slot 1104 when the weight is free to fall vertically, and is in contact with the guiding slot only when the weight is tilted to adjust and correct the weight.
In some embodiments, the upper and lower ends of the two sides of the weight are provided with guide pulleys or guide blocks, or the two sides of the upper end of the weight 3 are provided with guide pulleys and guide blocks.
In some embodiments, a plurality of guide pulleys or guide blocks may be disposed inside the guide frame 1, that is, the guide pulleys or guide blocks are mounted on the mounting plate 1101, and the guide grooves 1104 are opened on the outer circumference of the weight.
In some embodiments, the guiding device may also be a guiding hole formed on the weight 3, and the guiding frame 1 is provided with a guiding rod which is vertically installed in cooperation with the through hole, that is, the guiding hole and the guiding rod together form the guiding device; or a guide rod is arranged on the heavy hammer, a guide block is arranged on the guide frame 1, and a guide hole matched with the guide rod is formed in the guide block. Wherein the number of the guide holes is the same as the number of the guide rods.
The automatic unhooking device taught by the present invention is a product of the prior art and will be understood and appreciated by those skilled in the art. With reference to fig. 4, a schematic structural diagram of an automatic unhooking device 4 is shown, where the automatic unhooking device 4 includes a lifting lug 41, an upper end of the lifting lug 41 is connected to a hoisting device 5, and when the hoisting device 5 is a winch 51, a steel rope 52 wound on the winch 51 is fixedly connected to the lifting lug 41; the lower extreme fixedly connected with hanger plate 42 of lug 41, the lower extreme of hanger plate is connected with left grip block 46 and right grip block 47 respectively through round pin axle 45, the lower extreme of left grip block 46 and right grip block 47 is formed with and is used for centre gripping groove 48, the upper end of weight 3 is through the cable or couple centre gripping in centre gripping groove 48, it has handle 43 to go up still to sell hub connection on hanger plate 42 above left grip block 46 and the right grip block 47, it has wedge briquetting 44 to articulate on the handle, wedge briquetting 44 is located the perpendicular bisector between left grip block 46 and the right grip block 47 with the tie point of handle 43. The working process of the automatic unhooking device 4 is as follows: during the lifting process of the lifting device 5, the left clamping block 46 and the right clamping block 47 cannot rotate due to the action of the wedge-shaped pressing block 44, so that the heavy hammer is only clamped and driven to lift through the clamping groove 48; when the handle 43 of the automatic unhooking device 4 moves to the baffle or the stop bar 11, due to the blocking effect of the baffle or the stop bar 11, the handle 43 rotates, the wedge-shaped pressing block 44 continues to be pressed downwards, the wedge-shaped pressing block 44 enters the accommodating cavity formed between the left clamping block 46 and the right clamping block 47, the wedge-shaped pressing block 44 does not extrude the left clamping block and the right clamping block any more, under the self-weight action of the heavy hammer, the left clamping block 46 and the right clamping block 47 automatically rotate along the pin shaft 45, so that the clamping groove 48 is opened, and the heavy hammer is separated from the clamping groove 48 to move in a free falling mode.
The automatic unhooking device itself is known in the art, and the working process and principle thereof will be understood and appreciated by those skilled in the art, for example, the automatic unhooking device may also adopt the structure of the unhooking device disclosed in application No. 201720853355.4, and the structure of the automatic unhooking device will not be described herein.
In some embodiments, each of the first telescopic member 7 and the second telescopic member 10 includes a first connecting rod 71 and a second connecting rod 73, the first connecting rod 71 and the second connecting rod 72 are connected with an adjusting cylinder 72, the first connecting rod 71 and the second connecting rod 73 are both connected with the adjusting cylinder 72 in a threaded manner, and the length of the first connecting rod 71 and the length of the second connecting rod 73 extending into the adjusting cylinder 72 are adjusted through threads, so as to adjust the length of the first telescopic member 7 and the second telescopic member 10. The first telescopic piece and the second telescopic piece of the invention realize adjustable change of length through adjustment between the adjusting cylinder and the first connecting rod and the second connecting rod, thereby facilitating reasonable adjustment according to the distribution condition of prestressed foundation piles (prestressed foundation piles without high strain detection) on a construction site, improving the use flexibility of the invention and meeting the stability of a detection device under different conditions.
With reference to fig. 5, in some embodiments, the adjusting cylinder 72 includes a cylinder body 721, the cylinder body 721 is provided with a through hole 722 for accommodating the first connecting rod 71 and the second connecting rod 73, two sections of first thread sections 723 and second thread sections 724 with opposite spiral directions are processed in the through hole 722, the first connecting rod 71 is in threaded connection with the first thread sections 723, and the second connecting rod 73 is in threaded connection with the second thread sections 724. In this embodiment, by directly providing two sections of threads with opposite spiral directions, when the cylinder 721 is rotated in one direction, the lengths of the first connecting rod 71 and the second connecting rod 73 extending into the cylinder 721 can be adjusted, for example, when the first connecting rod moves towards the inside of the cylinder, the second connecting rod also moves towards the inside of the cylinder; when the first connecting rod moves in the direction far away from the cylinder body, the second connecting rod also moves in the direction far away from the cylinder body, so that the length of the first telescopic part 7 and the length of the second telescopic part 10 are adjusted; so that the embodiment has the characteristic of convenient adjustment.
Referring to fig. 6, in some embodiments, the adjusting cylinder 72 includes a cylinder body 721, the cylinder body 721 is opened with a through hole 722 for accommodating the first connecting rod 71 and the second connecting rod 73, two ends of the cylinder body 721 are respectively connected with an end cap 725 in a rotating manner, and the end cap 725 is provided with a threaded hole for threaded connection with the first connecting rod 71 and the second connecting rod 731. In this embodiment, the end caps 725 are rotatably connected to both sides of the cylinder 721, so that the lengths of the first connecting rod 71 and the second connecting rod 73 extending into the cylinder 721 can be respectively adjusted by rotating the end caps 725 at both ends of the cylinder 721, thereby adjusting the lengths of the first telescopic member 7 and the second telescopic member 10.
Referring to fig. 7, in this embodiment, two ends of the cylinder 721 may be provided with snap rings 726, a snap groove 727 is formed between the snap rings 726 and the cylinder 721, and a part of the end cap is clamped in the snap groove 727, so as to limit the end cap 725. When the device is installed, the end cover is firstly placed at the end part of the cylinder body 721, then the snap ring 726 is buckled, and the snap ring 726 is connected with the cylinder body 721 through bolts, so that the end cover 725 can rotate and can limit under the action of the cylinder body and the snap ring.
Referring to fig. 8, in some embodiments, the adjusting cylinder 72 includes a cylinder body 721, the cylinder body 721 is provided with a through hole 722 for accommodating the first connecting rod 71 and the second connecting rod 73, two ends of the cylinder body 721 are respectively and fixedly connected with an end cap 725, the first connecting rod 71 and the second connecting rod 73 respectively penetrate through the end cap 725 and extend into the cylinder body 721 and are respectively provided with a first adjusting nut 728 and a second adjusting nut 729, and the cylinder body 721 is provided with a movable space 7210 for rotating the first adjusting nut 728 and the second adjusting nut 729.
In the use process of the adjusting cylinder 72 in this embodiment, first, the first connecting rod and the second connecting rod are respectively in threaded connection with the first adjusting nut 728 and the second adjusting nut 729, then extend into the movable space 7210 in the cylinder body 721, then the end cover 725 and the cylinder body 721 are fastened and connected through bolts, and when the length of the first connecting rod and the length of the second connecting rod extending into the cylinder body need to be adjusted, the first adjusting nut 728 and the second adjusting nut 729 are rotated, so that the length adjustment of the first telescopic piece 7 and the length adjustment of the second telescopic piece are realized.
Referring to fig. 9, in some embodiments, the first connecting rod 71 and the second connecting rod 73 may be a long rod, one end of the long rod is fixedly connected to the ball heads of the spherical hinge seats (the first spherical hinge seat, the second spherical hinge seat and the third spherical hinge seat) by rivets, screws or welding, and the other end of the long rod is provided with a threaded section for threaded connection with the adjusting cylinder 72.
Referring to fig. 10, in some embodiments, each of the first link 71 and the second link 73 may include a first connecting section 711 and a second connecting section 712, and a connecting rope 713 is connected between the first connecting section 711 and the second connecting section 712, wherein the first connecting section 711 is configured to be fixedly connected to a ball head of the spherical hinge seat (the first spherical hinge seat, the second spherical hinge seat, and the third spherical hinge seat) by a rivet, a screw, or welding, and the second connecting section 712 is configured to be screwed to the adjusting cylinder 72. The structure of this embodiment can realize the regulation of length by adjusting the length that second linkage segment 712 stretches into regulation section of thick bamboo 72, can realize the regulation of length by adjusting the length of connecting rope 713 again, is convenient for simultaneously transport and accomodate.
In some embodiments, the first telescopic element 7 and the second telescopic element 10 can also adopt structures such as an electric telescopic rod, a hydraulic cylinder and the like to realize the length adjustment of the first telescopic element and the second telescopic element.
With reference to fig. 11, in some embodiments, clamping device 2 includes left arc piece 21 and right arc piece 22, the circular arc radius of left arc piece 21 and right arc piece 22 and the mutual adaptation of external diameter of prestressing force foundation pile, left arc piece 21 and right arc piece 22 form a whole circle and carry out the cladding centre gripping with prestressing force foundation pile, left arc piece 21 and right arc piece 22 all are connected with adjusting screw 23, solid fixed ring 24 is installed to the inboard of leading truck 1, gu seted up on the fixed ring 24 and held the chamber, the one end of adjusting end cover 25 is arranged solid fixed ring and is held the chamber and can rotate in holding the chamber, the screw thread through-hole with adjusting screw 23 mutual adaptation is seted up at the middle part of adjusting end cover 25. The clamping device of this embodiment is when using, at first place clamping device in prestressing force foundation pile's periphery, then rotate gradually and adjust end cover 25, thereby make left arc piece 21 and right arc piece 22 move towards prestressing force foundation pile, only the centre gripping with prestressing force foundation pile is up to left arc piece 21 and right arc piece 22, at last rethread bolt and nut, the buckle realizes dismantling between left arc piece 21 and the right arc piece 22 and is connected, thereby realize the firm of leading truck and prestressing force foundation pile through clamping device.
According to the invention, by arranging the clamping device 2, the installation stability of the guide frame 1 can be improved, and meanwhile, the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line, so that eccentric hammering is prevented.
In some embodiments, the guiding frame 1 is provided with a through hole 26 for moving the adjusting screw 23, so as to satisfy the moving space required by the adjusting screw 23 to move towards the prestressed foundation pile or away from the prestressed foundation pile.
This embodiment differs from the embodiment illustrated in fig. 11 with reference to fig. 12 in that: the left arc-shaped block 21 and the right arc-shaped block 22 cannot form a whole circle, and the left arc-shaped block 21 and the right arc-shaped block 22 can only clamp one part of the prestressed foundation pile. In this embodiment, the arc radii of the left arc-shaped block 21 and the right arc-shaped block 22 may be larger than the outer diameter of the prestressed foundation pile, so that prestressed foundation piles of different sizes can be clamped, and the practicability of the invention is improved.
This embodiment differs from the embodiment illustrated in fig. 11 with reference to fig. 13 in that: the left arc-shaped block 21 is fixedly connected with the guide frame 1, only the right arc-shaped block 22 is connected with the adjusting screw 23, the device can ensure that the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line by taking the left arc-shaped block 21 as a positioning block, and the device has the characteristic of convenience in installation and positioning.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present invention; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. A high strain detection method for a prestressed foundation pile is characterized by comprising a high strain detection device for the prestressed foundation pile, wherein the high strain detection device for the prestressed foundation pile comprises a guide frame, the guide frame is sequentially provided with a clamping device, a heavy hammer, an automatic tripping device and a lifting device from bottom to top, the heavy hammer is detachably connected with the automatic tripping device, the upper end of the automatic tripping device is connected with the lifting device arranged at the upper end of the guide frame, the vertical central line of the clamping device and the vertical central line of the heavy hammer are on the same straight line, the upper end of the guide frame is provided with at least three first spherical hinge seats, each first spherical hinge seat is not arranged on the same straight line, the ball head of each first spherical hinge seat is connected with a first telescopic piece with adjustable length, one end of each first telescopic piece is connected with the ball head of the first spherical hinge seat, the other end of the first telescopic piece is connected with a ball head of a second spherical hinge seat, and the second spherical hinge seat is detachably connected with an embedded anchor bolt of the prestressed foundation pile; the detection method comprises the following steps:
(1) placing the guide frame on a prestressed foundation pile prepared for high strain detection:
(2) clamping the clamping device on a prestressed foundation pile ready for high strain detection;
(3) connect first extensible member on the first spherical articulated seat of leading truck upper end:
(4) installing second spherical hinged seats on the rest prestressed foundation piles at the periphery of the prestressed foundation pile ready for high strain detection:
(5) connecting the first telescopic piece to the second spherical hinge seat, and adjusting the length of the first telescopic piece to enable the first telescopic piece to be tensioned;
(6) the lifting device drives the automatic unhooking device and the heavy hammer to rise until a handle of the automatic unhooking device touches the transverse plate or the transverse bar;
(7) and the heavy hammer is separated from the automatic unhooking device and freely falls down to hammer the prestressed foundation pile.
2. The method for detecting the high strain of the prestressed foundation pile according to claim 1, wherein the lower end of the guide frame is provided with at least three third spherical hinge seats, each third spherical hinge seat is not installed on the same straight line, and the third spherical hinge seats are detachably connected with the first telescopic piece or the second spherical hinge seat through second telescopic pieces with adjustable lengths; the detection method further comprises the following steps:
and (5) connecting a second telescopic piece with a third spherical hinged seat at the lower end of the guide frame between the step (5) and the step (6), connecting the second telescopic piece with the first telescopic piece or the second spherical hinged seat, and adjusting the length of the second telescopic piece to enable the second telescopic piece to be tensioned.
3. The method for detecting high strain of prestressed foundation pile according to claim 1, wherein at least two guides are disposed on the periphery of said weight, and a guide groove is disposed inside said guide frame, said guide groove being vertically disposed and engaged with said guides, said guides extending into said guide groove.
4. The prestressed foundation pile high-strain detection method as claimed in claim 3, wherein said guide means is a guide pulley or a guide block, said guide pulley or guide block extending into a guide groove.
5. The prestressed foundation pile high-strain detection method as claimed in any one of claims 1-4, wherein a sliding groove is formed in the guide frame, a sliding block is arranged in the sliding groove, the sliding block can slide in the sliding groove and can be locked in the sliding groove, a baffle or a stop bar is mounted on the sliding block and used for contacting with a handle of the automatic unhooking device so as to trigger the heavy hammer to be detached from the automatic unhooking device, and the detection method further comprises:
and (4) before the step (6), adjusting the height position of the upper transverse plate or the transverse bar of the guide frame according to the set falling height of the heavy hammer.
6. The prestressed foundation pile high-strain detection method as claimed in any one of claims 1-4, wherein the upper end and the lower end of the guide frame are respectively provided with a fixed plate, the fixed plate is provided with a sliding groove, the sliding groove is provided with a sliding block, the sliding block can slide in the sliding groove and can be locked in the sliding groove, and the first spherical hinge seat and the third spherical hinge seat are respectively fixedly arranged on the sliding block at the upper end of the guide frame and the sliding block at the lower end of the guide frame;
before the first spherical hinged seat is connected with the first telescopic piece, the position of the sliding block in the sliding groove is adjusted and the sliding block is locked in the sliding groove according to the distribution condition of the prestressed foundation piles for mounting the second spherical hinged seat.
7. The method for detecting the high strain of the prestressed foundation pile according to claim 1, wherein the first telescopic member and the second telescopic member each comprise a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod are connected with an adjusting cylinder, the first connecting rod and the second connecting rod are both in threaded connection with the adjusting cylinder, and the length of the first connecting rod and the length of the second connecting rod extending into the adjusting cylinder are adjusted through threads.
8. The method for detecting the high strain of the prestressed foundation pile according to claim 7, wherein the adjusting cylinder comprises a cylinder body, a through hole for accommodating the first connecting rod and the second connecting rod is formed in the cylinder body, a first threaded section and a second threaded section with opposite spiral directions are machined in the through hole, the first connecting rod is in threaded connection with the first threaded section, and the second connecting rod is in threaded connection with the second threaded section.
9. The method for detecting the high strain of the prestressed foundation pile according to claim 7, wherein the adjusting cylinder comprises a cylinder body, the cylinder body is provided with a through hole for accommodating the first connecting rod and the second connecting rod, two ends of the cylinder body are respectively and rotatably connected with an end cover, and the end cover is provided with a threaded hole in threaded connection with the first connecting rod and the second connecting rod.
10. The method for detecting the high strain of the prestressed foundation pile according to claim 7, wherein the adjusting cylinder comprises a cylinder body, the cylinder body is provided with a through hole for accommodating the first connecting rod and the second connecting rod, two ends of the cylinder body are respectively and fixedly connected with end covers, the first connecting rod and the second connecting rod respectively penetrate through the end covers and extend into the cylinder body and are respectively provided with a first adjusting nut and a second adjusting nut, and the cylinder body is provided with a movable space for rotating the first adjusting nut and the second adjusting nut.
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| CN202010583618.0A CN111733900B (en) | 2020-06-24 | 2020-06-24 | High strain detection method for prestressed foundation pile |
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| CN113404095A (en) * | 2021-04-12 | 2021-09-17 | 昆山求正工程质量检测有限公司 | Detection equipment and detection method for high strain of foundation pile |
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| CN111733900B (en) | 2021-11-30 |
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