CN107560950B - Device for measuring shear stress of interface of prestressed anchor rod and test method thereof - Google Patents
Device for measuring shear stress of interface of prestressed anchor rod and test method thereof Download PDFInfo
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- CN107560950B CN107560950B CN201710908216.1A CN201710908216A CN107560950B CN 107560950 B CN107560950 B CN 107560950B CN 201710908216 A CN201710908216 A CN 201710908216A CN 107560950 B CN107560950 B CN 107560950B
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- 238000010998 test method Methods 0.000 title claims description 9
- 239000011435 rock Substances 0.000 claims abstract description 29
- 239000011449 brick Substances 0.000 claims abstract description 26
- 238000004873 anchoring Methods 0.000 claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 238000005553 drilling Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 6
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The utility model provides a prestressing anchor interface shear stress measuring device, includes the body of rod, body of rod top and its parallel arrangement be used for the PVC pipe that the wire catchments, with PVC union coupling and nest in at least one PVC pipe ring that the body of rod outside interval set up, PVC pipe ring both sides be provided with rectangular hole groove respectively, the body of rod is including stretching into the interior anchor section of country rock and stretching out the free section of country rock, the body of rod both sides are corresponding to every position that is provided with PVC pipe ring and paste respectively strain gauge I, and this position articulates there is thin reinforcing bar, strain gauge I distributes on the interior anchor section of the body of rod according to experimental requirement, thin reinforcing bar draws out the strain brick that pastes strain gauge II respectively to body of rod both sides, and strain gauge II towards the interface that awaits measuring, PVC pipe ring and PVC pipe contact all are provided with the preformed hole that the wire passed, external strain gauge passes through the wire and is connected in strain gauge I and strain gauge II respectively. Provides help for better researching the long-term safety and durability of the rock-soil prestress anchoring structure.
Description
Technical Field
The invention belongs to the field of measuring devices and test methods, and particularly relates to a device for measuring shear stress of a prestressed anchor rod interface and a test method thereof.
Background
As a high-stress structure deeply buried in the ground, the rock-soil prestress anchoring structure is quite difficult to reinforce once the problems of poor construction, structural failure and the like occur, so that the stability problem under normal operation conditions and the long-term durability problem of the rock-soil prestress anchoring structure are considered. There are two interfaces on the anchoring segment within the prestressed anchoring structure: (1) an interface between the rod body and the grouting body; (2) an interface between the grouting body and the surrounding rock body. Research shows that the interfacial shear stress distribution rule of the anchoring section in the rod body directly influences the anchoring effect and durability under the action of external load.
The prestress anchor rod interface shear stress measuring device can be applied to researching influence of factors such as anchor rod rigidity, prestress, cyclic load, grouting body strength and the like on internal anchor section interface shear stress distribution and evolution rules, or using acquired field monitoring data as most likely damage positions of an anchor section in a prestress anchor structure or failure damage mode judgment of an anchor system. For the rock-soil prestress anchoring structure, a simple and effective measuring device and a test method thereof special for the shear stress of the rock-soil prestress anchor rod interface in actual engineering do not exist at present due to the complexity and the concealment of the structure.
Disclosure of Invention
Aiming at the problems, the invention provides a device for measuring the shear stress of a prestress anchor rod interface and a test method thereof.
In order to solve the problems, the invention adopts the following technical scheme: the utility model provides a prestressing anchor interface shear stress measuring device, includes the body of rod, body of rod top and its parallel arrangement be used for the PVC pipe that the wire catchments, the counter-force support of PVC pipe ring when PVC pipe is as the location of PVC pipe ring and tensile rod body for lay and protect the wire, with PVC union coupling and nest at least one PVC pipe ring that the body of rod outside interval set up for protection strain gauge II, PVC pipe ring both sides be provided with the rectangular hole groove that is used for passing thin reinforcing bar respectively, when tensile rod body of rod outwards towards the country rock, rectangular hole groove can realize the expansion of thin reinforcing bar, the body of rod includes the interior anchor section that stretches into the country rock and stretches out the free section of country rock, the body of rod both sides are corresponding to every position that is provided with PVC pipe ring and are pasted respectively and are used for the strain gauge I of test element, and this position articulates there is thin reinforcing bar, strain gauge I distributes on the interior anchor section of body of rod according to the test requirement, thin reinforcing bar is drawn forth respectively to the body of rod both sides and is strained piece II towards the measurement interface, and is "umbrella" support structure "and is in the form the wire pipe joint with the strain gauge II through the outer anchor, strain gauge II is connected with the guide wire that the parallel arrangement is passed through the anchor II respectively.
The strain gauge II is a three-way strain gauge, two strain gauges are perpendicular to each other, the other strain gauge is located on an angular bisector, and each strain gauge is connected to an external strain gauge through a lead.
The strain bricks are respectively arranged at the middle section of each thin steel bar and one end of the thin steel bar, which is close to the surrounding rock.
The side of the rod body is respectively provided with a parabolic centering support along the horizontal direction and the bottom along the vertical direction, and two bottom ends of the support are propped against the rod body and the top end is propped against surrounding rock so as to keep the device arranged in the surrounding rock drilling hole in the middle.
The PVC pipe ring is fixedly connected with the PVC pipe through screw holes and fixing bolts, a screw hole I is formed in the PVC pipe ring and in contact with the PVC pipe, and a screw hole II corresponding to the screw hole I is formed in the PVC pipe in a penetrating mode in the diameter direction.
The test method of the prestress anchor rod interface shear stress measuring device specifically comprises the following steps:
S1, drilling holes in a rock-soil body;
S2, respectively adhering strain gauges I on two sides of the rod body according to test requirements, enabling the adhering quantity and the distribution positions of the strain gauges I to meet the requirements, and performing waterproof treatment on the strain gauges I, such as coating waterproof materials on the surfaces of the strain gauges I;
s3, connecting PVC pipe rings on the outer side of the PVC pipe according to the sticking number and the distribution positions of the strain gauges I, and enabling each position of the rod body, to which the strain gauges I are stuck, to correspond to the PVC pipe rings.
S4, embedding the rod body into the PVC pipe ring;
S5, the thin steel bars penetrate through the rectangular hole grooves to be hinged with two sides of the rod body, the thin steel bars are in a tightening state, strain bricks with strain gauges II are mounted on the thin steel bars, and waterproof treatment is conducted on the strain gauges II.
S6, laying the wires along a PVC pipe, wherein the PVC pipe is used for laying and protecting the wires, and the external strain gauge is respectively connected with the strain gauge I and the strain gauge II through the wires;
s7, respectively welding the centering support on the side surface and the bottom of the rod body, so that the two bottom ends of the support prop against the rod body and the top end prop against the surrounding rock;
s8, conveying the anchoring section in the rod body, to which the strain gauge I is adhered, into surrounding rock drilling holes;
S9, fixing the PVC pipe, simultaneously stretching the rod body outwards towards the surrounding rock, gradually expanding the thin steel bars under the cooperation of the rectangular hole grooves, gradually increasing the included angle between the thin steel bars and the rod body, enabling the thin steel bars to be in a divergent state, and enabling the strain gauge II on the strain brick to reach a preset position;
s10, grouting cement;
S11, acquiring strain data through a strain gauge, so as to obtain an interface shear stress value.
In S5, the strain bricks are arranged at the middle section of the thin steel bar and at one end of the thin steel bar, which is close to the surrounding rock.
In the step S5, a semi-cylindrical groove is chiseled on one side of the strain brick along the longitudinal direction, and glue is smeared in the groove, so that the thin steel bar is stuck in the groove to be glued with the strain brick; after 24 hours, waterproof materials such as AB glue (which can be hardened at low temperature and has good cohesiveness and is commonly used for sealing and bonding the surface of an electric appliance) are smeared on the surface of the strain brick, and the surface of the strain brick and the part of the lead connected with the strain gauge II are sealed and insulated.
In the step S3, the PVC pipe ring is fixedly connected with the PVC pipe through a fixing bolt.
The invention provides a device and a method for measuring the interfacial shear stress of a prestressed anchor rod, which can assist in completing research works on the aspects of anchor action mechanism, failure mode judgment and the like by monitoring the interfacial shear stress of a prestressed anchor rod, make up for the blank of the device and the method for measuring the interfacial shear stress of the prestressed anchor rod, which are specially used in practical engineering, and also provide help for better researching the long-term safety and durability of the prestressed anchor structure of the prestressed anchor rod.
Drawings
FIG. 1 is a front view of the present measuring device;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a top view of the present measurement device;
FIG. 4 is a schematic view of a strain brick and strain gauge II;
Fig. 5 is a schematic diagram of the connection of the rod body and the strain gage I.
Wherein, 1, an inner anchoring section, 2, a free section, 3, surrounding rock, 4, a PVC pipe ring, 5, a PVC pipe, 6, a strain gauge I, 7, a thin steel bar, 8, a centering bracket, 9, a drilling hole, 10, a rod body, 11, a strain brick, 12, a lead, 13, a fixing bolt, 14, a strain gauge II, 15 and a rectangular hole groove.
Detailed Description
As shown in the figure, the device for measuring the shear stress of the prestressed anchor rod interface comprises a rod body 10, a PVC pipe 5 which is arranged above the rod body 10 and is used for converging a wire 12 in parallel with the rod body 10, and at least one PVC pipe ring 4 which is connected with the PVC pipe 5 and is nested at the outer side of the rod body 10 at intervals, wherein rectangular hole grooves 15 are respectively formed in two sides of the PVC pipe ring 4, the rod body 10 comprises an inner anchoring section 1 which stretches into a surrounding rock 3 and a free section 2 which stretches out of the surrounding rock 3, a strain gauge I6 is respectively stuck at the two sides of the rod body 10 corresponding to the position of each PVC pipe ring 4, fine steel bars 7 are hinged at the positions, the strain gauge I6 is distributed on the inner anchoring section 1 of the rod body 10 according to test requirements, strain bricks 11 stuck with strain gauges II 14 are respectively led out from the two sides of the fine steel bars 7 towards the interface to be measured, reserved holes through which the wire 12 passes are respectively formed in the contact positions of the PVC pipe ring 4 and the PVC pipe 5, and the external strain gauge I6 and the strain gauge II 14 are respectively connected with the strain gauges II 14 through the wire 12.
The strain gauge II 14 is a three-way strain gauge, two strain gauges are perpendicular to each other, the other strain gauge is located on an angular bisector, and each strain gauge is connected to an external strain gauge through a lead 12.
The strain bricks 11 are respectively arranged at the middle section of each thin steel bar 7 and one end of the thin steel bar 7 close to the surrounding rock 3.
The side surface of the rod body 10 is respectively provided with a parabolic centering support 8 along the horizontal direction and the bottom along the vertical direction, and two bottom ends of the support are propped against the rod body 10 and the top ends are propped against the surrounding rock 3.
PVC pipe ring 4 pass through screw and fixing bolt 13 and 5 fixed connection of PVC pipe, PVC pipe ring 4 go up and be provided with screw I with PVC pipe 5 contact position, and PVC pipe 5 goes up along the diameter direction and runs through there is the screw II that corresponds with screw I.
The test method of the prestress anchor rod interface shear stress measuring device specifically comprises the following steps:
S1, drilling holes in a rock-soil body;
S2, respectively sticking strain gauges I6 on two sides of the rod body 10 according to test requirements, and performing waterproof treatment on the strain gauges I6, such as coating waterproof materials on the surfaces of the strain gauges I6;
s3, connecting PVC pipe rings 4 on the outer side of the PVC pipe 5 according to the adhering number and the distribution positions of the strain gauges I6;
S4, embedding the rod body 10 into the PVC pipe ring 4;
S5, the thin steel bars 7 pass through the rectangular hole grooves 15 to be hinged with the two sides of the rod body 10, the thin steel bars 7 are in a tightening state, the strain bricks 11 adhered with the strain gauges II 14 are arranged on the thin steel bars 7, and the strain gauges II 14 are subjected to waterproof treatment;
S6, a lead 12 is laid along the PVC pipe 5, and the external strain gauge is respectively connected with the strain gauge I6 and the strain gauge II 14 through the lead 12;
s7, respectively welding the centering support 8 on the side surface and the bottom of the rod body 10, so that the two bottom ends of the support prop against the rod body 10 and the top end prop against the surrounding rock 3;
s8, conveying the anchoring section 1 in the rod body 10 adhered with the strain gauge I6 into the drilling hole 9 of the surrounding rock 3;
S9, fixing the PVC pipe 5, simultaneously stretching the rod body 10 outwards towards the surrounding rock 3, gradually expanding the thin steel bars 7 under the cooperation of the rectangular hole grooves 15, gradually increasing the included angle between the thin steel bars 7 and the rod body 10, enabling the thin steel bars 7 to be in a divergent state, and enabling the strain gauges II 14 on the strain bricks 11 to reach a preset position;
s10, grouting cement;
S11, acquiring strain data through a strain gauge, so as to obtain an interface shear stress value.
In S5, the strain brick 11 is installed at the middle section of the thin steel bar 7 and at one end of the thin steel bar 7 near the surrounding rock 3.
In the step S5, a semi-cylindrical groove is chiseled on one side of the strain brick 11 along the longitudinal direction, and glue is smeared in the groove, so that the thin steel bar 7 is stuck in the groove to be glued with the strain brick 11; after 24 hours, a waterproof material, such as AB glue, is applied to the surface of the strained brick 11.
In the step S3, the PVC pipe ring 4 is fixedly connected with the PVC pipe 5 through the fixing bolts 13.
Claims (7)
1. The utility model provides a prestressing anchor interface shear stress measuring device which characterized in that: the device comprises a rod body (10), a PVC pipe (5) which is arranged above the rod body (10) and is used for converging a wire (12) in parallel with the rod body (10), and at least one PVC pipe ring (4) which is connected with the PVC pipe (5) and is nested at the outer side of the rod body (10) at intervals, wherein rectangular hole grooves (15) are respectively formed in the two sides of the PVC pipe ring (4), the rod body (10) comprises an inner anchoring section (1) which stretches into surrounding rock (3) and a free section (2) which stretches out of the surrounding rock (3), strain gauges I (6) are respectively stuck at positions, corresponding to the positions, where the PVC pipe rings (4) are arranged, of the two sides of the rod body (10), fine steel bars (7) penetrate through the rectangular hole grooves (15) and are hinged with the two sides of the rod body (10), the strain gauges I (6) are distributed on the inner anchoring section (1) of the rod body (10) according to test requirements, strain gauges II (14) are respectively led out of the two sides of the rod body (10), strain gauges II (14) face to an interface to be tested, the PVC pipe ring (4) and the wire (12) are respectively penetrated through the strain gauges I and the wire (12) to be respectively arranged at the positions of the wire through the preset hole (12);
the strain bricks (11) are respectively arranged at the middle section of each thin steel bar (7) and one end of the thin steel bar (7) close to the surrounding rock (3);
the side of the rod body (10) is respectively provided with a parabolic centering bracket (8) along the horizontal direction and the bottom along the vertical direction, and two bottom ends of the bracket are connected with the rod body (10).
2. The device for measuring shear stress of a prestressed anchor interface according to claim 1, wherein: the strain gauge II (14) is a three-way strain gauge, two strain gauges are perpendicular to each other, the other strain gauge is located on an angular bisector, and each strain gauge is connected to an external strain gauge through a lead (12).
3. A device for measuring shear stress of a prestressed anchor interface according to claim 1 or 2, characterized in that: the PVC pipe ring (4) is fixedly connected with the PVC pipe (5) through screw holes and fixing bolts (13).
4. The test method of the prestress anchor interface shear stress measuring device according to claim 1, which is characterized by comprising the following test steps:
S1, drilling holes in a rock-soil body;
S2, respectively adhering strain gauges I (6) on two sides of the rod body (10) according to test requirements, enabling the adhering quantity and distribution positions of the strain gauges I (6) to meet the requirements, and performing waterproof treatment on the strain gauges I (6);
S3, connecting PVC pipe rings (4) on the outer side of the PVC pipe (5) according to the adhering number and the distribution positions of the strain gauges I (6), and enabling each position of the rod body (10) adhered with the strain gauges I (6) to correspond to the PVC pipe ring (4);
s4, embedding the rod body (10) in the PVC pipe ring (4);
s5, enabling the thin steel bars (7) to penetrate through the rectangular hole grooves (15) and hinge with two sides of the rod body (10), enabling the thin steel bars (7) to be in a tightening state, installing strain bricks (11) adhered with strain gauges II (14) on the thin steel bars (7), and performing waterproof treatment on the strain gauges II (14);
S6, a lead (12) is laid along the PVC pipe (5), and the external strain gauge is respectively connected with the strain gauge I (6) and the strain gauge II (14) through the lead (12);
S7, respectively welding the centering support (8) on the side surface and the bottom of the rod body (10), so that the two bottom ends of the support prop against the rod body and the top end prop against the surrounding rock;
s8, conveying the anchoring section (1) in the rod body (10) stuck with the strain gauge I (6) into a drilling hole (9) of the surrounding rock (3);
S9, fixing the PVC pipe (5), simultaneously outwards stretching the rod body (10) towards the surrounding rock (3), gradually expanding the thin steel bar (7) under the cooperation of the rectangular hole groove (15), gradually increasing the included angle between the thin steel bar (7) and the rod body (10), enabling the thin steel bar (7) to be in a divergent state, and enabling the strain gauge II (14) on the strain brick (11) to reach a preset position;
s10, grouting cement;
S11, acquiring strain data through a strain gauge, so as to obtain an interface shear stress value.
5. The assay method of claim 4, wherein: in S5, the strain brick (11) is arranged at the middle section of the thin steel bar (7) and one end of the thin steel bar (7) close to the surrounding rock (3).
6. The assay method of claim 4, wherein: in the step S5, a semi-cylindrical groove is chiseled on one side of the strain brick (11) along the longitudinal direction, and glue is smeared in the groove, so that the thin steel bar (7) is stuck in the groove to be glued with the strain brick (11); and (3) coating waterproof materials on the surface of the strain brick (11) after 24 hours.
7. The assay method of claim 4, wherein: in the step S3, the PVC pipe ring (4) is fixedly connected with the PVC pipe (5) through a fixing bolt (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710908216.1A CN107560950B (en) | 2017-09-29 | 2017-09-29 | Device for measuring shear stress of interface of prestressed anchor rod and test method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710908216.1A CN107560950B (en) | 2017-09-29 | 2017-09-29 | Device for measuring shear stress of interface of prestressed anchor rod and test method thereof |
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| CN107560950A CN107560950A (en) | 2018-01-09 |
| CN107560950B true CN107560950B (en) | 2024-05-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632158B (en) * | 2018-12-19 | 2024-11-08 | 天地科技股份有限公司 | Model test stress test block and preparation and use methods thereof |
| CN110470549B (en) * | 2019-07-25 | 2021-10-22 | 宁波大学 | System for testing shear strength size effect of anchoring structure surface |
| CN110631934B (en) * | 2019-09-27 | 2022-07-12 | 郑州新泰精密量仪有限公司 | Waveform gasket fatigue testing machine and testing method thereof |
| CN118294261B (en) * | 2024-05-13 | 2024-11-01 | 中国铁路成都局集团有限公司重庆建设指挥部 | Method for testing shear strength and damage mode of grouting body indoors |
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Effective date of registration: 20200909 Address after: Fengming Road District of Ji'nan City, Shandong province 250101 port development Shandong Jianzhu University Applicant after: SHANDONG JIANZHU University Applicant after: Shandong high speed Group Co.,Ltd. Address before: Fengming Road District of Ji'nan City, Shandong province 250101 port development Shandong Jianzhu University Applicant before: SHANDONG JIANZHU University Applicant before: QILU TRANSPORTATION DEVELOPMENT GROUP Co.,Ltd. Applicant before: CONSTRUCTION MANAGEMENT BRANCH OF QILU TRANSPORTATION DEVELOPMENT GROUP Co.,Ltd. |
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