CN214033822U - Active detection device for anchor rod holding load in locking state - Google Patents
Active detection device for anchor rod holding load in locking state Download PDFInfo
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- CN214033822U CN214033822U CN202022393359.3U CN202022393359U CN214033822U CN 214033822 U CN214033822 U CN 214033822U CN 202022393359 U CN202022393359 U CN 202022393359U CN 214033822 U CN214033822 U CN 214033822U
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Abstract
The utility model discloses a stock under locking condition holds load initiative detection device, including support ring, spring and displacement meter, the support ring includes two semicircular support that are in the same place through screwed connection, semicircular support includes catch, lock ear, extension board and landing leg, two semicircular support's catch encloses into the centre gripping space that is used for the centre gripping ground tackle, and lock ear and extension board all set up the outer wall at the catch, and the landing leg setting is on the extension board, the spring housing is established on the landing leg, and the displacement meter corresponds the support ring sets up. The utility model discloses the device is simple and convenient, but the prestressing force or the pulling force of short-term test stock improve real on-the-spot stock pulling force data for aassessment engineering safety and stability. The utility model discloses still provide the stock under the locking condition and hold carrying of load from detection method, it has the construction convenient, easy and simple to handle, advantage that the testing result is reliable.
Description
Technical Field
The utility model relates to a load initiative detection device and detection method are held to stock under the locking state belongs to construction technical field.
Background
The anchor rod is widely applied to geotechnical engineering, realizes the anti-pulling function by anchoring in a stable stratum, provides supporting force with strength for a supporting structure, an anchoring structure and the like, and ensures the safety and the stability of the geotechnical anchoring engineering. In actual engineering, in order to effectively control the deformation of a structure or a soil body, the anchor rod often exerts prestress in the engineering, and the locking size of the prestress directly relates to the safety of the engineering. However, due to the reasons of construction and the like, after the prestress is tensioned and locked, large prestress loss often exists, so that the locking value is smaller than or even far smaller than the designed prestress value, or the actual tension is far smaller than the designed axial tension, and great potential safety hazards are caused to the engineering. Once the anchor rod is locked, the real prestress or actually born tension of the anchor rod is difficult to detect, and great technical challenges are brought to the prestress anchoring engineering.
The inventors searched the following related patent documents: (1) CN206902781U discloses a detection device and a detection method for the outside of the internal force of an anchor rod, and the detection device is provided with an anchor rod, a counter-force die, a perforated gasket, a magnetic force standard, a displacement sensor, a base body and an anchor rod drawing instrument. The perforated gasket is arranged at the outer side wall of the clamping piece type anchorage and in a cavity of the displacement counter-force die, the displacement sensor is positioned in the cavity, and the side head of the displacement sensor is in contact with the displacement test point on the surface of the perforated gasket so as to prop the perforated gasket against the outer side wall of the clamping piece of the anchorage when the perforated gasket is pressed against the clamping piece. When the anchor rod is tensioned in a grading manner, the displacement of the perforated gasket is observed, when the perforated gasket is displaced, the force reading of the anchor rod drawing instrument is recorded, and the force value in the anchor rod is judged. This method is too simple, leading to the following serious problems: the perforated gasket is difficult to displace or even cannot displace. The reason is that the opening through which the steel strand passes in the anchorage device adopting the locking anchor rod is a tapered hole, the clamping piece is arranged in the tapered hole to clamp the steel strand, the large opening of the tapered hole faces the empty surface, the small opening of the tapered hole faces the slope protection pile, and in the continuous stress process of the steel strand, the internal teeth of the clamping piece clamp the steel strand more and more tightly in the tapered hole. When the steel strand is tensioned by adopting the drawing instrument on the outer side, the clamping piece can generate displacement when the tensioning force of the steel strand is smaller than the internal force of the anchor rod in the tensioning process because the clamping piece clamps the steel strand; secondly, the anchorage device can not generate displacement. Because the clamping piece is placed in the taper hole of the anchor, the outer wall of the clamping piece and the inner wall of the taper hole are both smooth surfaces, even if the tensile force is greater than the internal force of the anchor rod, the anchor cannot generate upward displacement under the action of gravity and the action of the top pressing of the perforated gasket; and thirdly, the error of the internal force of the anchor rod is large. Because the displacement of the clamping piece is not the corresponding displacement when the tension force reaches the internal force of the anchor rod, the anchor does not generate displacement, and therefore, the corresponding tension force when the perforated gasket is displaced is judged to be the internal force value of the anchor rod, so that great error exists, or the result cannot be measured. (2) CN107503386A discloses a detection device and a detection method for load held by a bolt body, the detection device comprises a support stool, a jack, a dynamometer, a tool anchor and a dial indicator which are sequentially arranged along the axial direction of the bolt from bottom to top, the bottom surface of the support stool is supported on a backing plate of a waist beam of a completed bolt structure, the top surface of the support stool is contacted with the bottom surface of the jack, the support stool is fixed between the backing plate and the jack through the pretightening force of the jack, the top end of the jack is provided with a piston, the exposed free end of the bolt sequentially passes through the centers of the support stool, the jack, the dynamometer and the tool anchor from bottom to top, the top end of the anchor extends out of the tool anchor, the tool anchor is fixedly connected with the upper part of the exposed free end of the bolt, the dynamometer is clamped between the piston and the tool anchor, the piston pushes the dynamometer, and the dial indicator is arranged on the tool anchor. And when the displacement mutation on the load-displacement relation curve is obvious through analysis, taking the load value corresponding to the steep rising starting point as the load held by the anchor rod body. The method is theoretically feasible, namely when the tensile force is smaller than the held load, the displacement of the tool anchor is theoretically the theoretical elongation of the steel strand between the tool anchor and the working anchor, when the tensile force is larger than the held load, the working anchor is unlocked, the tensile deformation generated by the steel strand at the free section of the anchor rod reacts in the deformation of the tool anchor, and the deformation is steeply increased, so that the sudden change point of the load-displacement curve is theoretically the held load of the anchor rod. However, in actual operation, there are various errors depending on the magnitude of the holding load, and the following problems arise: the catastrophe point is delayed, and the load of the anchor rod is tested to be larger. When the tensile force is larger than the held load, the clamping piece and the steel strand can generate relative displacement due to the gap between the clamping piece and the steel strand, and the clamping piece is further locked into the tapered hole of the anchorage device until the gap between the clamping piece and the steel strand completely disappears. When the clamping piece is further locked and enters the tapered hole of the anchor, the tensile force is increased, the displacement of the anchor is smaller than the displacement value of the steel strand, so that the catastrophe point of a load-displacement curve is lagged, namely the tensile force corresponding to the lagged catastrophe point is larger than the load held by the anchor rod; secondly, the larger the load of the anchor rod is, the larger the error of the test result is. Because the gap between the clamping piece and the steel strand in the tool anchor continuously occurs along with the increase of tensile force, when the holding load is larger, the larger the gap capable of being compressed is, the more serious the displacement lag of the tool anchor is, and the larger the error of the detection method is caused. (3) CN108487334A discloses a construction method for detecting the load held by a prestressed anchor rod by a lift-off method, which comprises the following construction steps: preparation in the early stage of construction, including preparation of tools and preparation of various instruments; acquiring data, namely acquiring load data and displacement data of the prestressed anchorage device by adopting a lift-off method; and data analysis, namely performing data analysis on the acquired load data and displacement data to determine the holding load of the prestressed anchorage device. This method has the second problem of the patent document CN 206902781U. In addition, a thin and narrow steel sheet with the thickness of 1.0mm is inserted between the working anchor and the steel backing plate for detection, when the tensile force reaches the holding load, the anchorage device and the steel backing plate are not separated, and the thickness of the steel sheet is not enough, so that the problem of delay in confirming the separation of the full section of the anchorage device from the steel backing plate exists, and the detection holding load is larger.
Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a load initiative detection device is held to stock under locking state, it has simple structure, the swift advantage of installation, the utility model discloses an another aim at provides stock under the locking state and holds carrying of load from detection method, and it has the advantage that the construction is convenient, easy and simple to handle, and the testing result is reliable.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the anchor rod holding load active detection device in the locking state comprises a support ring, a spring and a displacement meter, wherein the support ring comprises two semicircular supports which are connected together through screws, each semicircular support comprises a locking ring, a locking lug, a support plate and a support leg, the locking rings of the two semicircular supports enclose a clamping space for clamping an anchor, the locking lugs and the support plates are arranged on the outer walls of the locking rings, the support legs are arranged on the support plates, the spring sleeves are arranged on the support legs, and the displacement meter corresponds to the support ring.
As an optimized mode of the present invention, the supporting leg is disposed at one end of the supporting plate and perpendicular to the supporting plate.
As an optimized mode of the utility model, the semicircular bracket be provided with the threading hole on the lock lug, the screw is worn to establish in the threading hole, set the nut on the screw.
As an optimal mode of the utility model, be equipped with the taper hole on the ground tackle, be equipped with a plurality of clamping pieces in the taper hole, the centre gripping has the muscle body in a plurality of clamping pieces, the one end of ground tackle is equipped with the backing plate, the spring sets up the extension board with between the backing plate, the natural length of spring is greater than the extension board extremely the clear distance of backing plate.
As an optimized mode of the utility model, be equipped with the magnetism gauge stand on the backing plate, be equipped with the connecting rod on the magnetism gauge stand, the displacement meter is installed on the connecting rod, the pointer of displacement meter supports the top and is in on the extension board.
As an optimized mode of the utility model, every set up two on the semicircular bracket the lock ear, every set up one on the semicircular bracket the extension board.
As an optimized mode of the utility model, the displacement meter is two, two the displacement meter corresponds two respectively the extension board sets up.
The method for detecting the lifting-off of the anchor rod-held load in the locking state comprises the following construction steps:
(1) fixed mounting of support ring
Sleeving the spring on the supporting leg, sleeving the semicircular bracket outside the anchorage device, enabling the spring on the supporting leg to abut against a base plate positioned below the anchorage device, and then fastening the two semicircular brackets on the anchorage device by adopting screws and nuts on the locking lugs;
(2) displacement meter mounting
Fixing a magnetic gauge stand provided with a displacement meter on the base plate, adjusting the displacement meter to enable a pointer to vertically abut against the support plate, and symmetrically mounting the displacement meter on the support plate of the semicircular bracket;
(3) tension test
Tensioning a rib body by using a jack, simultaneously connecting the tensioning force of the jack and the lift-off displacement tested by the displacement meter into a signal collector, and establishing an average value curve of the tensioning force and the lift-off displacement in the signal collector; when the tensile force is smaller than the load held by the anchor rod, the rib body is still in a locking state, the anchor is pressed against the base plate, the lifting displacement is always zero, and the process is an unlocking process; when the tensile force is increased to the holding load of the anchor rod, the clamping piece for locking the rib body is about to be separated from the rib body and is not separated from the rib body; when the tensile force is increased to exceed the holding load of the anchor rod, the clamping piece is separated from the anchor, the rib body is unlocked, the support ring moves upwards under the pushing action of the spring, the lifting displacement is larger than zero, and the lifting displacement continues to increase along with the increase of the tensile force, and the process is a lifting process;
(4) determination of held load
By analyzing the average curve of the tensile force and the lift-off displacement, the corresponding tensile force of the starting point when the average lift-off displacement is greater than zero can be obtained as the anchor rod-held load, namely the intersection point of the unlocking process curve and the lift-off process curve is the anchor rod-held load.
Adopt the technical scheme of the utility model afterwards, there is following apparent advantage in stock holding load initiative detection device and detection method under the locking state: (1) because the utility model adopts the bracket ring sleeved with the compression spring to connect the working anchorage device, when the tension force of the anchor rod is equal to the load, the spring can actively and timely push the anchorage device to ensure that the anchorage device generates displacement along the direction of separating from the backing plate; (2) the spring can respond to the opportunity that the tensile force is equal to the holding load in time, and the load-displacement curve on the model collector can actively and accurately record the unlocking process and the lifting process, so that the turning points of the unlocking process curve and the lifting process curve can be accurately reflected, and the holding load of the anchor rod can be accurately tested; (3) the utility model discloses detection device simple structure, simple to operate, the test result is reliable.
Drawings
Fig. 1 is a top view of the bracket ring of the present invention after installation.
Fig. 2 is a cross-sectional view taken along line a-a of fig. 2 according to the present invention.
Fig. 3 is a cross-sectional view taken along line B-B of fig. 2 according to the present invention.
Fig. 4 is a front view of the semicircular bracket of the present invention.
Fig. 5 is a top view of the present invention.
Fig. 6 is a side view of the present invention.
FIG. 7 is a graph of mean tensile force versus lift-off displacement.
In the figure:
1 support ring 11 semi-circular support 12 lock ring
13 lock ear 14 threading hole 15 support plate
16-support 17, spring 18, screw 19 and nut
2 magnetic gauge stand 21 link 3 displacement meter 31 pointer
4 anchor 41 taper hole 42 clamping piece 43 rib body
5 shim plate 51 hole for penetrating rib
6 support beam 61 rib hole
7 soil body
Detailed Description
In order to further explain the technical solution of the present invention, the following embodiments are described in detail. Referring to fig. 1-7, the utility model discloses an anchor rod under locking state holds load initiative detection device, including support ring 1, spring 17 and displacement meter 3, support ring 1 includes two semicircle supports 11 that link together through screw 18, semicircle support 11 includes catch 12, lock ear 13, extension board 15 and landing leg 16, two the catch 12 of semicircle support 11 encloses into the centre gripping space that is used for centre gripping ground tackle 4, and lock ear 13 and extension board 15 all set up the outer wall at catch 12, and landing leg 16 sets up on extension board 15, spring 17 cover is established on landing leg 16, and displacement meter 3 corresponds support ring 1 sets up.
As a preferred mode of the present invention, the supporting leg 16 is disposed at one end of the supporting plate 15 and perpendicular to the supporting plate 15.
As a preferred mode of the present invention, the semicircular bracket 11 is provided with a threading hole 14 on the locking lug 13, the screw 18 is inserted into the threading hole 14, and the screw 18 is provided with a nut 19.
As an optimized mode of the utility model, be equipped with a plurality of taper holes 41 on ground tackle 4, be equipped with a plurality of clamping pieces 42 in every taper hole 41, in the embodiment, every taper hole 41 sets up two clamping pieces 42, and the centre gripping has muscle body 43 in a plurality of clamping pieces 42, the one end of ground tackle 4 is equipped with backing plate 5, and backing plate 5 supports and leans on supporting beam 6, is equipped with on supporting beam 6 and wears muscle hole 61, and muscle body 43 passes and wears to in the soil body 7 from wearing muscle hole 61. The spring 17 is arranged between the support plate 15 and the backing plate 5, and the natural length of the spring 17 is larger than the clear distance from the support plate 15 to the backing plate 5.
As an optimized mode of the utility model, be equipped with magnetism gauge stand 2 on the backing plate 5, be equipped with connecting rod 21 on the magnetism gauge stand 2, connecting rod 21 sets up along the horizontal direction, displacement meter 3 installs on connecting rod 21, displacement meter 3's pointer 31 supports and withstands on extension board 15, the test extension board 15 for the lift of ground tackle 4 is from the displacement, and displacement meter 3 is connected with signal collector.
As an optimized mode of the present invention, each of the two locking lugs 13 and two are disposed on the semicircular bracket 11, the two ends of the locking ring 12 are respectively disposed on the locking lugs 13, and each of the two ends of the locking ring 12 is disposed on the semicircular bracket 11, and the supporting plate 15 is disposed in the middle of the locking ring 12.
As an optimized mode of the utility model, the displacement meter 3 is two, two the displacement meter 3 corresponds two respectively the extension board 15 sets up.
The utility model discloses the stock under the locking condition holds carrying of load and from detection method has still been provided, including following construction steps:
(1) fixed mounting of support ring
Firstly, the spring 17 is sleeved on the supporting leg 16, then the semicircular bracket 11 is sleeved outside the anchorage device 4, the spring 17 on the supporting leg 16 is abutted against the backing plate 5 below the anchorage device 4, and then the two semicircular brackets 11 are fastened on the anchorage device 4 by adopting the screw 18 and the nut 19 on the locking lug 13.
(2) Displacement meter mounting
Fixing the magnetic meter base 2 provided with the displacement meter 3 on the backing plate 5, adjusting the displacement meter 3 to enable the pointer 31 to vertically abut against the support plate 15, and symmetrically mounting the displacement meter 3 on the support plate 15 of the semicircular bracket 11.
(3) Tension test
And tensioning the rib body 43 by using a jack, simultaneously connecting the tensioning force of the jack and the lift-off displacement tested by the displacement meter 3 into a signal collector, and establishing an average curve of the tensioning force and the lift-off displacement in the signal collector. When the tensile force is smaller than the load held by the anchor rod, the rib body 43 is still in a locking state, the anchor 4 is pressed against the backing plate 5, the lifting displacement is always zero, and the process is an unlocking process; when the tensile force is increased to the holding load of the anchor rod, the clamping sheets 42 locking the rib body 43 are separated from the rib body 43 without separation; when the tension force is increased to exceed the holding load of the anchor rod, the clamping piece 42 is separated from the anchor 4, the rib body 43 is unlocked, at the moment, the bracket ring 1 moves upwards under the pushing action of the spring 17, the lifting displacement is larger than zero, and the lifting displacement is continuously increased along with the increase of the tension force, and the process is a lifting process.
(4) Determination of held load
By analyzing the average curve of the tensile force and the lift-off displacement, the corresponding tensile force of the starting point when the average lift-off displacement is greater than zero can be obtained as the anchor rod-held load, namely the intersection point of the unlocking process curve and the lift-off process curve is the anchor rod-held load.
Adopt the technical scheme of the utility model afterwards, usable stock holds load initiative detection device and lifts away from detection method, conveniently, fast, accurately detect out the stock under the locking state hold the load, improve real stock pulling force for the safety and the stability analysis and the evaluation of engineering.
The product form of the present invention is not limited to the embodiment of the present invention, and any person can properly change or modify the product form of the present invention without departing from the scope of the present invention.
Claims (7)
1. The stock under the locking condition holds load initiative detection device, its characterized in that: the support ring comprises two semicircular supports which are connected together through screws, each semicircular support comprises a locking ring, a locking lug, a support plate and a support leg, the locking rings of the two semicircular supports enclose a clamping space for clamping an anchorage device, the locking lugs and the support plates are arranged on the outer walls of the locking rings, the support legs are arranged on the support plates, the spring sleeves are arranged on the support legs, and the displacement meters are arranged corresponding to the support ring.
2. The active detection device of bolt holding load in locking state of claim 1, characterized in that: the supporting legs are arranged at one ends of the supporting plates and are perpendicular to the supporting plates.
3. The active detection device of bolt holding load in locking state of claim 2, characterized in that: the lock lug of the semicircular support is provided with a thread hole, the screw penetrates through the thread hole, and a nut is arranged on the screw in a matched mode.
4. The active detection device of bolt holding load in locking state of claim 3, characterized in that: the anchor is provided with a taper hole, a plurality of clamping pieces are arranged in the taper hole, a rib body is clamped in the clamping pieces, a base plate is arranged at one end of the anchor, the spring is arranged between the support plate and the base plate, and the natural length of the spring is larger than the clear distance from the support plate to the base plate.
5. The active detection device of bolt holding load in locking state of claim 4, characterized in that: the base plate is provided with a magnetic gauge stand, the magnetic gauge stand is provided with a connecting rod, the displacement meter is installed on the connecting rod, and a pointer of the displacement meter abuts against the supporting plate.
6. The active detection device of bolt holding load in locking state of claim 5, characterized in that: two locking lugs are arranged on each semicircular bracket, and one supporting plate is arranged on each semicircular bracket.
7. The active detection device of bolt holding load in locking state of claim 6, characterized in that: the displacement meter is two, two the displacement meter corresponds two the extension board setting respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022393359.3U CN214033822U (en) | 2020-10-23 | 2020-10-23 | Active detection device for anchor rod holding load in locking state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022393359.3U CN214033822U (en) | 2020-10-23 | 2020-10-23 | Active detection device for anchor rod holding load in locking state |
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| CN214033822U true CN214033822U (en) | 2021-08-24 |
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| CN202022393359.3U Active CN214033822U (en) | 2020-10-23 | 2020-10-23 | Active detection device for anchor rod holding load in locking state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575825A (en) * | 2020-10-23 | 2021-03-30 | 华侨大学 | Active detection device and detection method for anchor rod load in locking state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112575825A (en) * | 2020-10-23 | 2021-03-30 | 华侨大学 | Active detection device and detection method for anchor rod load in locking state |
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