CN108978734A - Indoor simulation test device for stress characteristic of fiber rib anti-floating anchor rod - Google Patents
Indoor simulation test device for stress characteristic of fiber rib anti-floating anchor rod Download PDFInfo
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- CN108978734A CN108978734A CN201810402379.7A CN201810402379A CN108978734A CN 108978734 A CN108978734 A CN 108978734A CN 201810402379 A CN201810402379 A CN 201810402379A CN 108978734 A CN108978734 A CN 108978734A
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- 238000004088 simulation Methods 0.000 title claims abstract description 20
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- 238000007667 floating Methods 0.000 title abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 52
- 238000011068 loading method Methods 0.000 claims abstract description 43
- 238000009434 installation Methods 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims description 86
- 229910000831 Steel Inorganic materials 0.000 claims description 47
- 239000010959 steel Substances 0.000 claims description 47
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 32
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- 238000000034 method Methods 0.000 claims description 13
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- 238000012423 maintenance Methods 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000004570 mortar (masonry) Substances 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 6
- 238000007586 pull-out test Methods 0.000 claims description 6
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Classifications
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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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of foundation engineering test equipment, and relates to an indoor simulation test device for stress characteristics of a fiber-reinforced anti-floating anchor rod, wherein spherical hinge supports are welded at the centers of the lower surfaces of two supporting platforms symmetrically arranged on a smooth base, a bearing platform is arranged between the two supporting platforms, a base plate and bedrock are respectively arranged on the two supporting platforms, an anchor rod body stress meter is arranged in a fiber-reinforced anti-floating anchor rod body, a first constant-rigidity plate is arranged on a loading surface of the base plate and the bedrock, a jack is arranged above the bearing platform, a load sensor is arranged between a second constant-rigidity plate and the jack, an automatic displacement acquisition meter is horizontally arranged on a rigid wing of the anchor rod, a displacement base is arranged at the upper end of the loading surface, a centering ring is arranged on the bedrock, and the centering ring is coupled with the fiber-reinforced anti; the device has the advantages of simple structure, convenience and quickness in installation, strong operability, safety, reliability, high test precision, low cost and high reuse rate.
Description
Technical field:
The invention belongs to ground foundation engineering technical field of test equipment, are related to a kind of fiber bar anti-float anchor rod mechanical characteristic
Existing pull-out test device is improved, solves the problems, such as anchorage by simulation laboratory test device, can precisely, quickly
Anti-pulling capacity, shaft stress variation and the anchoring body deformation for testing fiber bar anti-float anchor rod, for simulating fiber bar anti-floating
Anchor pole is in the mechanical characteristic in sole plate and basement rock environment.
Background technique:
Fiber bar is with fibrous material (carbon fiber, glass fibre, aramid fiber, basalt fibre etc.) for reinforcing material,
Synthetic resin is basis material, impregnates the unsaturated polyester resin containing a variety of auxiliary agents such as curing agent, promotor using silvalin
Etc. after resin adhesive liquids, by pultrusion, winding screw thread, a kind of one-time formed new material of solidification.This fiber bar anti-float anchor rod
Have many advantages, such as tensile strength height, light weight, anticorrosive, electromagnetism interference, cost performance is high.In anti-floating engineering, fiber is used
Muscle anti-float anchor rod can overcome metal material anti-float anchor rod during military service by chloride ion, sulfate radical plasma in underground water
Chemical attack, and in the Construction of Urban Rail Traffic project of coastal area direct current generate stray electrical current to metal material
The electrochemical corrosion of generation makes anti-float anchor rod bearing capacity and durability be guaranteed.Simultaneously as fiber bar category anisotropy material
Material, when being used as anti-float anchor rod, shear behavior is poor, and should not bend, and pull-out test heavy workload, time-consuming, can give engineering
Cause unnecessary trouble.Chinese patent 201720304289.5 discloses a kind of rockbolt stress characteristic research and is filled with pull-out test
It sets, including anchor pole preparation system and loading system；Anchor pole preparation system includes system framework, backing plate, a first shell and more
A second shell, loading system include axial force loading device and normal direction force loading device, and the present apparatus realizes collection anchor pole system for the first time
Work is integrated with stress test, can first be made anchor pole and be carried out application axial tension to anchor pole again, analyze the stress condition of anchor pole,
During anchor rod drawing test, it may be implemented to apply anchor pole body controllable normal stress effect, approximate simulation anchor pole
Practical axial direction stress condition preferably takes so that relevant anchor pole axial direction mechanical characteristic result of study seems more reasonable, applicable
It is engaged in the design and construction of anchor pole, but the device is only capable of simulation anchor pole axially with normal direction stress condition, cannot measure anchor simultaneously
The anti-pulling capacity and shaft variation of stress of bar；201710052406.8 disclosing the anchor pole tested under different operating conditions to answer
The experimental rig and method of power meter, this experimental rig include test platform, and test platform upper surface opens up that there are two be mutually perpendicular to
Support track, be provided with roller support in each support track, the central upper portion of roller support is provided with rotation axis, rotation
It is provided with clamping device at the top of axis, anchor pole is clamped between two roller supports, bolt stress meters, two are installed among anchor pole
A strain gauge and two jack, bolt stress meters and strain gauge are connect by data line with data collector；This method includes
Following steps: experimental rig (1) is installed；(2) anchor pole is installed；(3) fixed roller support；(4) installation data collector；(5) right
Anchor pole is tested；(6) data processing, the principle of the present invention is fairly simple, and the state for simulating rockbolt stress is true, but in reality
Its measurement data accuracy is not high and at high cost in the test of border；201420358169.X disclosing a kind of for testing anchor pole
The testing stand of comprehensive mechanical property, the testing stand include be arranged in it is described installation testboard on propulsion and mixing test mechanism,
Bending load mechanism for testing, the axial load mechanism for testing, shearing that installation pre-tightens mechanism for testing and is arranged on work testboard
Load test mechanism and shock loading mechanism for testing；It may be implemented in experiment indoor simulation rockbolt installation and work by the testing stand
Process, and torsion is applied to anchor pole, stretching, bending, is sheared and individual events or the multinomial group of bonding forces such as impact；Using mutually independent
Loading system applies respective loads to anchor pole, can carry out the independent experiment of various load in rockbolt installation and the course of work respectively,
It can also carry out installation stress and the caused stretching of surrouding rock deformation, shear and the combination of several any work stress such as impact load
Test, thus comprehensive mechanical property of the validity test anchor pole under various different force compound actions, but the testing stand is main
For mine support, and structure is complicated, inconvenient.It therefore, is verifying fiber bar anti-float anchor rod in the feasible of engineer application
Property, urgently design it is a kind of rationally, quickly and effectively pull-out test test device is extremely urgent, there is very important reality meaning
Justice and theoretical value.
Summary of the invention:
It is an object of the invention to overcome disadvantage of the existing technology, is reducing experimentation cost and improving test efficiency
Under the premise of, design provides a kind of fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device, makes its more closing to reality work
Journey can quickly, precisely test the anti-pulling capacity and shaft variation of stress of fiber bar anti-float anchor rod, it is most important that energy
The working mechanism of true anti-float anchor rod system (while the anchoring of simulation with the anchoring of basement rock and with sole plate) is enough simulated, i.e.,
Self-compensation fiber grating sensor is installed in fiber bar anti-float anchor rod shaft, after the body of rod is put into the reserved grout hole of basement rock into anchor,
The other end is connected with sole plate, carries out anti-float anchor rod anti-pulling capacity and deformation test using simulation laboratory test device.
To achieve the goals above, main structure of the invention include smooth pedestal, support platform, cushion cap, sole plate,
It is basement rock, injected hole, the fiber bar anti-float anchor rod body of rod, rock bolt shank stress meter, the first permanent rigidity plate, the second permanent rigidity plate, very heavy
Top, load sensor, automatic displacement acquisition meter, displacement pedestal, the rigid wing of anchor pole, centralizer；Smooth pedestal and support platform are common
Support system is formed, symmetrically placed two support platforms on smooth pedestal, the lower surface center of each support platform is along level side
To five ball hinged supports of uniform welding, it is equipped with cushion cap between two support platforms, sole plate and basement rock are separately mounted to two
In support platform, the length of basement rock is greater than the length of sole plate, and the position of form center of basement rock is provided with injected hole, fiber bar anti-floating anchor
Club shaft and sole plate pour the anchoring for simulating anti-float anchor rod and sole plate jointly, and the fiber bar anti-float anchor rod body of rod is put
Enter the center of injected hole and the cement mortar of M30 is perfused for simulating anchoring of the anti-float anchor rod in basement rock；Rock bolt shank stress
For meter using quasi- distribution mode installation by adhering in the fiber bar anti-float anchor rod body of rod, it is miniature that rock bolt shank stress is calculated as self-compensation type
The multiple spot fiber grating string of fiber Bragg grating strain sensor composition, is distributed subject to self-compensation type mini optical fibre grating strain transducer
Formula arrangement, is arranged one every 5cm within the scope of 30cm near the loading surface of sole plate and basement rock, is more than the every 10cm of this range
Setting one；First permanent rigidity plate, the second permanent rigidity plate and jack constitute loading system, the central axes of loading system and fiber
Muscle anti-float anchor rod body of rod axis collinear, the first permanent rigidity plate are mounted on the loading surface of sole plate and basement rock, the second permanent rigidity
Plate is mounted on the first permanent rigidity plate side ipsilateral with loading surface, and the top of cushion cap, the second permanent rigidity plate is arranged in jack
Load sensor, load sensor, automatic displacement acquisition meter, displacement pedestal, the common structure of the rigid wing of anchor pole are equipped between jack
At measurement system, the rigid wing of anchor pole is arranged at sole plate and basal surfaces 5cm；Automatic displacement acquisition meter is horizontally arranged at
On the rigid wing of anchor pole, displacement pedestal is mounted on the upper end of loading surface, on basement rock length direction at the position of trisection there are three installations
To middle ring, it is of coupled connections to middle ring and the fiber bar anti-float anchor rod body of rod.
Smooth pedestal of the present invention is made of the single side smooth steel plate of long 5m, width 2m, thickness 2cm, for reducing drawing
The frictional resistance of bottom surface when test；Support platform is made of the steel plate of thickness 3cm, long 1.2m, width 0.8m, and support platform can subtract
The friction of small brace foundation bottom plate and basement rock and ground, and ensure the weight of brace foundation bottom plate and basement rock.
Cushion cap of the present invention is placed on steel cushion block by steel plate and is made, steel plate thickness 1cm, a length of 80cm, and width is
50cm, steel pad thickness are 3cm, a length of 40cm, width 40cm, when test with steel cushion block will steel plate 3-2 it is padded to needed for testing
Temporary support and locating platform of the loading position as loading system.
Sole plate of the present invention is cast-in-situ steel reinforced concrete rectangular parallelepiped structure, and strength grade of concrete presses design requirement
It determines, the strength grade of ordinary circumstance concrete is C30, a length of 1m of sole plate, width 0.8m, a height of 0.8m；Basement rock is adopted
The intensity of weathering ragstone in being simulated with cast-in-place concrete, basement rock is controlled according to the compression strength of concrete, having a size of
Long 1.5m, wide 0.8cm, high 0.8m；Pvc pipe (diameter 9cm, long 1m, the outer surface of pvc pipe when injected hole is casting concrete
Apply vaseline, facilitate taking-ups after concrete reaches curing time) reserve through hole；The fiber bar anti-float anchor rod body of rod selects glass
The full thread solid hopkinson bar of glass fibre reinforced composites (GFRP) can enhance the bond stress between anchor rod body and anchoring body, and
Enough anchoring frictional force is provided；Self-compensation type mini optical fibre grating strain transducer in rock bolt shank stress meter is small in size,
Convenient for implantation, and influence of the temperature change to test result can be rejected, not need individually to arrange temperature sensor again.
The a length of 15cm, width 15cm, thickness 3cm of of the present invention first permanent rigidity plate；Second permanent rigidity plate it is a length of
20cm, width 15cm, thickness 3cm；Jack uses 50 tons of oil pressure punching jack, for providing enough pulling capacities.
Load sensor of the present invention is type vibration wire automatic pressure acquisition sensor, and automatic displacement acquisition is calculated as amesdial
Displacement meter, automatic displacement acquisition meter is connected with external acquisition system realizes the automatic collection of deflection in loading procedure；Displacement
Pedestal is made of magnet base, lever, expansion bolt, nut, supporting steel plate, and magnet base is mounted on supporting steel plate, and lever is mounted on
Magnet base middle position, be displaced pedestal in supporting steel plate expansion bolt and matched nut be separately fixed at sole plate and
On basement rock；The rigid wing of anchor pole is welded by 5cm × 5cm × 0.5cm angle bar and the semicircle steel pipe of outer diameter 2cm, wall thickness 0.3cm,
And it is adhesive on the fiber bar anti-float anchor rod body of rod using structure；Centralizer is the plastics mounting ring of outer diameter 8cm.
The present invention carries out the detailed process of simulation laboratory test to fiber bar anti-float anchor rod mechanical characteristic are as follows:
(1) it makes basement rock: vertically building the template of basement rock first, the pvc pipe that outside is coated with release agent is fixed on basement rock
On axis line position in template, concrete standard test block is made using prior art casting concrete and under the same conditions,
To take out pvc pipe to form injected hole before its final set, insertion is implanted with the fiber bar anti-floating of rock bolt shank stress meter in injected hole
Anchor rod body, and centralizer is installed in the preliminary making position of the fiber bar anti-float anchor rod body of rod, M30 cement mortar is poured, is made simultaneously
Make mortar specimen, maintenance to age forms mortar anchoring body, detects its intensity；Rock bolt shank stress is protected in the process
Meter, it is ensured that its survival rate reaches 95%；
(2) make sole plate: in the support platform of smooth pedestal be horizontally arranged intensity up to 100% basement rock, so
The second permanent rigidity plate, jack and load sensor are sequentially passed through into the fiber bar anti-float anchor rod body of rod afterwards and are mounted on the upper of cushion cap
Surface guarantees the centroid of the second permanent rigidity plate, jack, load sensor and the fiber bar anti-float anchor rod body of rod with always
Line, then build in support platform the template of sole plate, banding steel cage, the fiber bar anti-float anchor rod body of rod exists in fixed basement rock
Position in the template of sole plate, last casting concrete make sole plate, and concrete standard test block is made under the conditions of
And its intensity is tested, maintenance to age, to determine the relative position of sole plate and basement rock before its final set again, it is ensured that levelness
With the survival rate of 95% rock bolt shank stress meter；
(3), displacement meter is installed: drilling installation displacement pedestal in position first on the upper side in sole plate and basement rock center with electric drill
Expansion bolt and steel plate, then be 2:1 with mass ratio epoxy resin and curing agent mixed liquor anchor pole is pasted on corresponding position
The rigid wing conserves 3 days, after epoxy resin is fully cured, magnet base is adsorbed on supporting steel plate and installs automatic displacement acquisition
Meter, the telescopic rod of automatic displacement acquisition meter is finally compressed a certain distance, and (ensuring telescopic rod when test at least can extend
4cm, displacement more than 4cm think that anchor pole destroys) alignment is placed on the rigid wing of anchor pole, guarantee automatic displacement acquisition meter level with
Vertically；
(4), it is tested: jack and external hydraulic oil pump being connected firmly with matched oil pipe, by automatic displacement
Acquisition meter and rock bolt shank stress meter are connect with the (FBG) demodulator interface of external acquisition system respectively, initial reading are recorded, wait sense
Device survival rate meets the requirements rear multistage loadings, while recording test data, test Load-unload and termination loading environment and anchor pole
The criterion of destruction is executed by " building foundation pit supporting technical regulation " (JGJ120-2012)).
The present invention need to guarantee base before use, to ensure fiber bar anti-float anchor rod body of rod axial tension when pull-out test as far as possible
Plinth bottom plate central axes, basement rock central axes, fiber bar anti-float anchor rod body of rod axis, loading system central axes are horizontal；Guarantee basic bottom
The compactness and intensity of mortar and epoxy resin in the concrete of plate and basement rock, grout hole.
Compared with prior art, the present invention its structure is simple, and install convenient, strong operability, securely and reliably, measuring accuracy
Height, at low cost, reuse rate is high, can truely and accurately reflect the working condition of anti-float anchor rod in Practical Project.
Detailed description of the invention:
Fig. 1 is main structure schematic illustration of the invention.
Fig. 2 is main structure top view of the invention.
Fig. 3 is the principle schematic diagram of the rigid wing of anchor pole of the present invention, wherein (a) is main view, it (b) is top view.
Fig. 4 is the principle schematic diagram of centralizer of the present invention.
Fig. 5 is the principle schematic diagram of displacement pedestal of the present invention, wherein (a) is main view, it (b) is top view.
Specific embodiment:
The invention will be further described by way of example and in conjunction with the accompanying drawings.
Embodiment:
The main structure of the present embodiment includes smooth pedestal 1, support platform 2, cushion cap 3, sole plate 4, basement rock 5, slip casting
Hole 6, the fiber bar anti-float anchor rod body of rod 7, the permanent rigidity plate 10 of the permanent rigidity plate 9, second of rock bolt shank stress meter 8, first, jack
11, load sensor 12, automatic displacement acquisition meter 13, displacement pedestal 14, the rigid wing 15 of anchor pole, centralizer 16；Smooth pedestal 1 and branch
Support platform 2 collectively constitutes support system, symmetrically placed two support platforms 2 on smooth pedestal 1, the following table of each support platform 2
Face center five ball hinged supports 17 of uniform welding in the horizontal direction are equipped with cushion cap 3,4 He of sole plate between two support platforms 2
Basement rock 5 is separately mounted in two support platforms 2, and the length of basement rock 5 is greater than the length of sole plate 4, the position of form center of basement rock 5
It is provided with injected hole 6, the fiber bar anti-float anchor rod body of rod 7 and sole plate 4 are poured jointly for simulating anti-float anchor rod and sole plate
Anchoring, the fiber bar anti-float anchor rod body of rod 7 is put into the center of injected hole 6 and the cement mortar of M30 is perfused for simulating anti-floating anchor
Anchoring of the bar in basement rock；Rock bolt shank stress meter 8 is using quasi- distribution mode installation by adhering in the fiber bar anti-float anchor rod body of rod 7
Interior, rock bolt shank stress meter 8 is the multiple spot fiber grating string of self-compensation type mini optical fibre grating strain transducer composition, self compensation
Distributed arrangement subject to the type that declines fiber Bragg grating strain sensor, the 30cm range near the loading surface of sole plate 4 and basement rock 5
It is interior to be arranged one every 5cm, it is more than that the every 10cm of this range is arranged one；The first permanent rigidity plate 10 of permanent rigidity plate 9, second and very heavy
Top 11 constitutes loading system, the central axes of loading system and 7 axis collinear of the fiber bar anti-float anchor rod body of rod, the first permanent rigidity plate 9
It is mounted on the loading surface of sole plate 4 and basement rock 5, the second permanent rigidity plate 10 is mounted on the first permanent rigidity ipsilateral with loading surface
On 9 side of plate, the top of cushion cap 3 is arranged in jack 11, is equipped with loading between the second permanent rigidity plate 10 and jack 11 and senses
Device 12, load sensor 12, automatic displacement acquisition meter 13, displacement pedestal 14, the rigid wing 15 of anchor pole collectively form measurement system, anchor pole
The rigid wing 15 is arranged at 5 top surface 5cm of sole plate 4 and basement rock；Automatic displacement acquisition meter 13 is horizontally arranged at the rigid wing of anchor pole
On 15, displacement pedestal 14 is mounted on the upper end of loading surface, and there are three centerings for installation at the position of trisection on 5 length direction of basement rock
Ring 16 is of coupled connections to middle ring 16 and the fiber bar anti-float anchor rod body of rod 7.
Smooth pedestal 1 described in the present embodiment is made of the single side smooth steel plate of long 5m, width 2m, thickness 2cm, is drawn for reducing
The frictional resistance of bottom surface when pulling out test；Support platform 2 is made of the steel plate of thickness 3cm, long 1.2m, width 0.8m, 2 energy of support platform
Enough reduce the friction of brace foundation bottom plate 4 and basement rock 5 and ground, and ensures the weight of brace foundation bottom plate 4 and basement rock 5.
Cushion cap 3 described in the present embodiment is placed on steel cushion block 3-1 by steel plate 3-2 and is made, and steel plate 3-2 is a length of with a thickness of 1cm
80cm, width 50cm, steel cushion block 3-1 are with a thickness of 3cm, a length of 40cm, width 40cm, with steel cushion block 3-1 by steel plate 3-2 when test
Temporary support and locating platform of the padded loading position to needed for testing as loading system.
Sole plate 4 described in the present embodiment is cast-in-situ steel reinforced concrete rectangular parallelepiped structure, and strength grade of concrete is by design
It is required that determining, the strength grade of ordinary circumstance concrete is C30, a length of 1m of sole plate 4, width 0.8m, a height of 0.8m；Base
Rock 5 simulated using cast-in-place concrete in weathering ragstone, the intensity of basement rock 5 controls according to the compression strength of concrete,
Having a size of long 1.5m, wide 0.8cm, high 0.8m；Injected hole 6 be casting concrete when pvc pipe (diameter 9cm, long 1m, pvc pipe
Outer surface apply vaseline, facilitate taking-ups after concrete reaches curing time) reserve through hole；The fiber bar anti-float anchor rod body of rod
7 select the full thread solid hopkinson bar of glass fibre reinforced composion (GFRP), can enhance holding between anchor rod body and anchoring body
Power is wrapped up in, and enough anchoring frictional force is provided；Self-compensation type mini optical fibre grating strain transducer in rock bolt shank stress meter 8
It is small in size, convenient for implantation, and influence of the temperature change to test result can be rejected, not need individually to arrange temperature sensing again
Device.
The a length of 15cm, width 15cm, thickness 3cm of first permanent rigidity plate 9 described in the present embodiment；Second permanent rigidity plate 10
A length of 20cm, width 15cm, thickness 3cm；Jack 11 uses 50 tons of oil pressure punching jack, for providing enough drawings
Power.
Load sensor 12 described in the present embodiment is type vibration wire automatic pressure acquisition sensor, and automatic displacement acquisition meter 13 is
Amesdial displacement meter, automatic displacement acquisition meter 13 is connected with external acquisition system realizes that the automatic of deflection is adopted in loading procedure
Collection；Displacement pedestal 14 is made of magnet base 14-1, lever 14-2, expansion bolt 14-3, nut 14-4, supporting steel plate 14-5, magnetic
Power seat 14-1 is mounted on supporting steel plate 14-5, and lever 14-2 is mounted on the middle position magnet base 14-1, the branch being displaced in pedestal 14
Steel plate 14-5 is held to be separately fixed on sole plate 4 and basement rock 5 with expansion bolt 14-3 and matched nut 14-4；The rigid wing of anchor pole
15 are welded by 5cm × 5cm × 0.5cm angle bar and the semicircle steel pipe of outer diameter 2cm, wall thickness 0.3cm, and use structure gluing
On the fiber bar anti-float anchor rod body of rod 7,；Centralizer 16 is the plastics mounting ring of outer diameter 8cm.
The present embodiment carries out the detailed process of simulation laboratory test to fiber bar anti-float anchor rod mechanical characteristic are as follows:
(1) it makes basement rock 5: vertically building the template of basement rock 5 first, the pvc pipe that outside is coated with release agent is fixed on base
On axis line position in 5 template of rock, using prior art casting concrete and makes concrete standard under the same conditions and try
Block, to take out pvc pipe to form injected hole 6 before its final set, insertion is implanted with the fiber of rock bolt shank stress meter 8 in injected hole 6
The muscle anti-float anchor rod body of rod 7, and centralizer 16 is installed in the preliminary making position of the fiber bar anti-float anchor rod body of rod 7, pour M30 cement bonded sand
Slurry, while mortar specimen is made, maintenance to age forms mortar anchoring body, detects its intensity；Anchor pole is protected in the process
Shaft stress meter 8, it is ensured that its survival rate reaches 95%；
(2) make sole plate 4: in the support platform 2 of smooth pedestal 1 be horizontally arranged intensity up to 100% basement rock
5, the second permanent rigidity plate 10, jack 11 and load sensor 12 are then sequentially passed through into the fiber bar anti-float anchor rod body of rod 7 and pacified
Mounted in the upper surface of cushion cap 3, guarantee the second permanent rigidity plate 10, jack 11, load sensor 12 and fiber bar anti-float anchor rod
The centroid of the body of rod 7 is in same straight line, then builds in support platform 2 template of sole plate 5, banding steel cage, fixed basement rock 5
Position of the middle fiber bar anti-float anchor rod body of rod 7 in the template of sole plate 4, last casting concrete make mixed under the conditions of
Solidifying soil reference block simultaneously tests its intensity, maintenance to age, to determine the opposite of sole plate 4 and basement rock 5 before its final set again
Position, it is ensured that levelness and 95% rock bolt shank stress meter 8 survival rate；
(3), displacement meter is installed: drilling installation displacement base in position first on the upper side in sole plate 4 and 5 center of basement rock with electric drill
The expansion bolt and steel plate of seat 14, then the epoxy resin for being 2:1 with mass ratio are pasted on corresponding position with curing agent mixed liquor
The rigid wing 15 of anchor pole conserves 3 days, after epoxy resin is fully cured, magnet base 14-1 is adsorbed on supporting steel plate 14-5 and is pacified
Automatic displacement acquisition meter 13 is filled, the telescopic rod of automatic displacement acquisition meter 13, which is finally compressed a certain distance, (ensures to stretch when test
Contracting bar can at least extend 4cm, and displacement thinks that anchor pole destroys more than 4cm) alignment is placed on the rigid wing 15 of anchor pole, guarantee oneself
Dynamic displacement acquisition meter 13 is horizontal and vertical；
(4), it is tested: jack 11 and external hydraulic oil pump being connected firmly with matched oil pipe, by automatic position
It moves acquisition meter 13 and rock bolt shank stress meter 8 is connect with the (FBG) demodulator interface of external acquisition system respectively, record initial reading, to
Sensor survival rate meets the requirements rear multistage loadings, while recording test data, test Load-unload and terminate loading environment and
The criterion that anchor pole destroys is executed by " building foundation pit supporting technical regulation " (JGJ120-2012)).
Claims (7)
1. a kind of fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device, it is characterised in that main structure includes smooth base
Seat, support platform, cushion cap, sole plate, basement rock, injected hole, the fiber bar anti-float anchor rod body of rod, rock bolt shank stress meter, first
Permanent rigidity plate, the second permanent rigidity plate, jack, load sensor, automatic displacement acquisition meter, displacement pedestal, the rigid wing of anchor pole, centering
Device；Smooth pedestal and support platform collectively constitute support system, symmetrically placed two support platforms on smooth pedestal, each support
The lower surface center of platform five ball hinged supports of uniform welding in the horizontal direction are equipped with cushion cap, basis between two support platforms
Bottom plate and basement rock are separately mounted in two support platforms, and the length of basement rock is greater than the length of sole plate, the centroid position of basement rock
It sets and is provided with injected hole, the fiber bar anti-float anchor rod body of rod and sole plate are poured jointly for simulating anti-float anchor rod and sole plate
Anchoring, the fiber bar anti-float anchor rod body of rod is put into the center of injected hole and the cement mortar of M30 is perfused to exist for simulating anti-float anchor rod
Anchoring in basement rock；Rock bolt shank stress meter uses quasi- distribution mode installation by adhering in the fiber bar anti-float anchor rod body of rod, anchor
Club body stress is calculated as the multiple spot fiber grating string of self-compensation type mini optical fibre grating strain transducer composition, and self-compensation type is miniature
Distributed arrangement subject to fiber Bragg grating strain sensor, near the loading surface of sole plate and basement rock within the scope of 30cm every
5cm is arranged one, is more than that the every 10cm of this range is arranged one；First permanent rigidity plate, the second permanent rigidity plate and jack constitute and add
Loading system, the central axes of loading system and fiber bar anti-float anchor rod body of rod axis collinear, the first permanent rigidity plate are mounted on basic bottom
On the loading surface of plate and basement rock, the second permanent rigidity plate is mounted on the first permanent rigidity plate side ipsilateral with loading surface, jack
The top of cushion cap is set, is equipped with load sensor between the second permanent rigidity plate and jack, load sensor, automatic displacement are adopted
Collection meter, displacement pedestal, the rigid wing of anchor pole collectively form measurement system, and the rigid wing of anchor pole is arranged apart from sole plate and basal surfaces
At 5cm；Automatic displacement acquisition meter is horizontally arranged on the rigid wing of anchor pole, and displacement pedestal is mounted on the upper end of loading surface, basement rock length
Installation is of coupled connections to middle ring and the fiber bar anti-float anchor rod body of rod there are three to middle ring at the position of trisection on direction.
2. fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device according to claim 1, it is characterised in that described
Smooth pedestal is made of the single side smooth steel plate of long 5m, width 2m, thickness 2cm, the friction resistance of bottom surface when for reducing pull-out test
Power；Support platform is made of the steel plate of thickness 3cm, long 1.2m, width 0.8m, and support platform can reduce brace foundation bottom plate and base
The friction of rock and ground, and ensure the weight of brace foundation bottom plate and basement rock.
3. fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device according to claim 1, it is characterised in that described
Cushion cap is placed on steel cushion block by steel plate and is made, steel plate thickness 1cm, a length of 80cm, width 50cm, and steel pad thickness is 3cm,
A length of 40cm, width 40cm, when test, use steel cushion block that metal mat is up to tested to required loading position as loading system
Temporary support and locating platform.
4. fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device according to claim 1, it is characterised in that described
Sole plate is cast-in-situ steel reinforced concrete rectangular parallelepiped structure, and the strength grade of concrete is C30, a length of 1m of sole plate, wide
For 0.8m, a height of 0.8m；Basement rock simulated using cast-in-place concrete in weathering ragstone, the intensity of basement rock is according to concrete
Compression strength controls, having a size of long 1.5m, wide 0.8cm, high 0.8m；Pvc pipe is reserved when injected hole is casting concrete
Through hole；The fiber bar anti-float anchor rod body of rod selects the full thread solid hopkinson bar of glass fibre reinforced composion, can enhance anchor pole bar
Bond stress between body and anchoring body, and enough anchoring frictional force is provided；Self-compensation type in rock bolt shank stress meter is miniature
Fiber Bragg grating strain sensor is small in size, convenient for implantation, and can reject influence of the temperature change to test result, not need again
Individually arrangement temperature sensor.
5. fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device according to claim 1, it is characterised in that described
The a length of 15cm, width 15cm, thickness 3cm of first permanent rigidity plate；A length of 20cm of second permanent rigidity plate, width 15cm, thickness are
3cm；Jack uses 50 tons of oil pressure punching jack, for providing enough pulling capacities.
6. fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device according to claim 1, it is characterised in that described
Load sensor is type vibration wire automatic pressure acquisition sensor, and automatic displacement acquisition is calculated as amesdial displacement meter, and automatic displacement is adopted
Collection meter is connected with external acquisition system realizes the automatic collection of deflection in loading procedure；Be displaced pedestal by magnet base, lever,
Expansion bolt, nut, supporting steel plate composition, magnet base are mounted on supporting steel plate, and lever is mounted on magnet base middle position, displacement
Supporting steel plate expansion bolt and matched nut in pedestal are separately fixed on sole plate and basement rock；The rigid wing of anchor pole by
5cm × 5cm × 0.5cm angle bar and the semicircle steel pipe of outer diameter 2cm, wall thickness 0.3cm are welded, and are adhesive in fibre using structure
It ties up on the muscle anti-float anchor rod body of rod；Centralizer is the plastics mounting ring of outer diameter 8cm.
7. fiber bar anti-float anchor rod mechanical characteristic simulation laboratory test device according to claim 1, it is characterised in that use
The device carries out the detailed process of simulation laboratory test to fiber bar anti-float anchor rod mechanical characteristic are as follows:
(1) it makes basement rock: vertically building the template of basement rock first, the pvc pipe that outside is coated with release agent is fixed on basement rock template
On interior axis line position, concrete standard test block is made using prior art casting concrete and under the same conditions, to it
It takes out pvc pipe to form injected hole before final set, insertion is implanted with the fiber bar anti-float anchor rod of rock bolt shank stress meter in injected hole
The body of rod, and centralizer is installed in the preliminary making position of the fiber bar anti-float anchor rod body of rod, M30 cement mortar is poured, while making sand
Test block is starched, maintenance to age forms mortar anchoring body, detects its intensity；Rock bolt shank stress meter is protected in the process, really
It protects its survival rate and reaches 95%；
(2) make sole plate: in the support platform of smooth pedestal be horizontally arranged intensity up to 100% basement rock, then will
Second permanent rigidity plate, jack and load sensor sequentially pass through the fiber bar anti-float anchor rod body of rod and are mounted on the upper table of cushion cap
Face, guarantee the centroid of the second permanent rigidity plate, jack, load sensor and the fiber bar anti-float anchor rod body of rod in same straight line,
Build the template of sole plate in support platform again, banding steel cage, the fiber bar anti-float anchor rod body of rod is in base in fixed basement rock
Position in the template of plinth bottom plate, last casting concrete make sole plate, make concrete standard test block simultaneously under the conditions of
Test its intensity, maintenance to age, to determine the relative position of sole plate and basement rock before its final set again, it is ensured that levelness and
The survival rate of 95% rock bolt shank stress meter；
(3), displacement meter is installed: first with electric drill in the swollen of sole plate and basement rock center drilling installation displacement pedestal in position on the upper side
Swollen bolt and steel plate, then the epoxy resin and curing agent mixed liquor that are 2:1 with mass ratio paste the rigid wing of anchor pole on corresponding position,
Magnet base is adsorbed on supporting steel plate after epoxy resin is fully cured and installs automatic displacement acquisition meter, most by maintenance 3 days
The telescopic rod compression alignment of automatic displacement acquisition meter is placed on the rigid wing of anchor pole afterwards, guarantees that automatic displacement acquisition meter is horizontal and vertical
Directly；
(4), it is tested: jack and external hydraulic oil pump being connected firmly with matched oil pipe, automatic displacement is acquired
Meter and rock bolt shank stress meter connect respectively with the (FBG) demodulator interface of external acquisition system, record initial reading, to sensor at
Motility rate meets the requirements rear multistage loadings, while recording test data, and test Load-unload and termination loading environment and anchor pole destroy
Criterion by " building foundation pit supporting technical regulation " (JGJ120-2012) execute).
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| CN201810402379.7A CN108978734A (en) | 2018-04-28 | 2018-04-28 | Indoor simulation test device for stress characteristic of fiber rib anti-floating anchor rod |
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| CN110542359A (en) * | 2019-09-05 | 2019-12-06 | 华侨大学 | anti-floating anchor rod drawing test displacement measurement auxiliary device |
| CN111398036A (en) * | 2020-04-22 | 2020-07-10 | 天津大学 | Measure dilatory test system of intelligence of undersea structure atress |
| CN112945426A (en) * | 2021-01-29 | 2021-06-11 | 西南石油大学 | Vibrating wire sensor and stress displacement testing method |
| CN113125292A (en) * | 2021-04-01 | 2021-07-16 | 东北大学 | Device and method for manufacturing anchoring body of pre-buried distributed optical fiber |
| CN113514184A (en) * | 2021-09-14 | 2021-10-19 | 四川交达预应力工程检测科技有限公司 | Anchoring force detection device and measurement calculation method |
| CN113984550A (en) * | 2021-12-30 | 2022-01-28 | 中国矿业大学(北京) | Anchor rod drawing and shearing testing device |
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