CN107817162B - Rapid drawing test method for nonmetal anti-floating anchor rod with enlarged head - Google Patents
Rapid drawing test method for nonmetal anti-floating anchor rod with enlarged head Download PDFInfo
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- CN107817162B CN107817162B CN201710923360.2A CN201710923360A CN107817162B CN 107817162 B CN107817162 B CN 107817162B CN 201710923360 A CN201710923360 A CN 201710923360A CN 107817162 B CN107817162 B CN 107817162B
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- 229910052755 nonmetal Inorganic materials 0.000 title claims abstract description 129
- 238000007667 floating Methods 0.000 title claims abstract description 100
- 238000010998 test method Methods 0.000 title claims description 5
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 70
- 239000010959 steel Substances 0.000 claims description 70
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 239000003365 glass fiber Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 239000011083 cement mortar Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000007586 pull-out test Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- General Health & Medical Sciences (AREA)
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Abstract
The invention belongs to the technical field of foundation engineering equipment, and relates to a method for rapidly drawing an expansion head nonmetal anti-floating anchor rod, wherein a multi-positioning anti-drawing expansion head is arranged at the rod end and the rod body of the nonmetal anchor rod, and after the rod body is placed into a drilled hole and grouted to form an anchor rod, a rapid drawing test device is adopted to perform anti-drawing bearing capacity and deformation test on the anti-floating anchor rod; the anchor rod anti-floating device is convenient to construct, simple to install, safe, reliable, strong in operability, high in testing precision, not easy to damage, reusable, low in cost, high in anti-pulling bearing capacity of the anchor rod, good in durability and capable of effectively improving anti-floating capacity of the anchor rod.
Description
The technical field is as follows:
the invention belongs to the technical field of foundation engineering equipment, and relates to a rapid drawing test method of an expansion head nonmetal anti-floating anchor rod, wherein an anchor rod is distributed with multiple positioning expansion heads at the bottom and the middle part in a rock body to improve the anti-pulling bearing capacity and optimize the anchoring body length of the anti-floating anchor rod; the drawing test device is improved, quick installation can be realized, operability is strong, a plurality of test parts can be repeatedly used, and cost is reduced.
Background art:
the metal material anti-floating anchor rod is easy to be subjected to Na from underground water along with the time after being anchored in a rock-soil layer+、Ga2+、Mg2+、Clˉ、SO2- 4The chemical corrosion of plasma seriously affects the bearing performance and durability of the anti-floating anchor rod, and the influence is more serious in the anti-floating application of engineering in coastal regions. And particularly, in the related projects of urban rail transit construction, the metal materials are extremely easy to be seriously electrochemically corroded by the stray current generated by direct current. Therefore, the problem of corrosion prevention of the anti-floating anchor rod in the ground layer becomes more important, but the current corrosion prevention handThe segment does not solve this problem at all. The GFRP (glass fiber Reinforced polymer) rib is a novel material which is formed in one step by taking glass fiber as a reinforcing material and synthetic resin as a base material, impregnating resin glue solution such as unsaturated polyester resin containing various auxiliaries such as a curing agent, an accelerator and the like with fiber yarn, and then performing pultrusion, thread winding and curing. The non-metal anti-floating anchor rod has the advantages of high tensile strength, light weight, corrosion resistance, electromagnetic interference resistance, low price, high cost performance, wide application and the like compared with other fiber reinforced polymers. Because of GFRP muscle shearing resistance can not be good, should not buckle, so add the enlarged footing and can effectively improve the body of rod bearing capacity in effectual concrete floor, simultaneously, for verifying body of rod application engineering requirement, a reasonable, quick, effectual test device that draws is indispensable. Chinese patent 201620388657.4 discloses a multi-section enlarged footing anchor rod drawing test device, which comprises a foundation box, a simulation foundation installed in the foundation box, a multi-section enlarged footing anchor rod model arranged in the simulation foundation and an anchor rod drawing system positioned above the simulation foundation, wherein the simulation foundation is formed by compacting loess or sandy soil installed in the foundation box; the multi-section expansion head anchor rod model is vertically arranged and comprises an anchor rod body and a plurality of expansion heads arranged on the anchor rod body from top to bottom, wherein the anchor rod body is a cylindrical screw rod which is vertically arranged, and each expansion head is a cylindrical screw sleeve which is coaxially sleeved on the cylindrical screw rod; the anchor rod drawing system is connected with the top end of the cylindrical screw rod; chinese patent 201310343292.4 discloses an indoor test device that draws of stock, belong to geotechnical engineering technical field, test device is by horizontal loading system, vertical loading system, the anchor rod system of drawing, a case body, the support column, the bearing board is constituteed, this test device can realize the loading to two horizontal directions of sample and vertical direction, the indoor test device that draws of traditional anchor rod can't carry out the test problem of drawing under the loading condition has been solved, the acoustic emission sensor who sets up among the test device, can realize that whole monitoring anchor rod draws the inside damage that takes place of test in-process sample and destroy, the crack sprouts and the expanded condition, the limitation of inconvenient monitoring anchor body mechanical response among the traditional indoor test of drawing has been overcome. However, these prior art drawing testsThe testing device is limited to an indoor drawing testing device and method, field rapid assembly cannot be realized, and the testing conditions are limited; meanwhile, the problems that the shear strength of a rod body is insufficient and the setting length of the anchor rod in a foundation is optimized due to unreasonable anchor device setting in the anchor rod drawing test process cannot be solved.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides a drawing test method of an expansion head nonmetal anti-floating anchor rod under the conditions of not increasing the cost, ensuring the safety of operators and improving the working efficiency, so that the anchoring length of the nonmetal anti-floating anchor rod is optimally designed, and the ultimate anti-drawing bearing capacity of the nonmetal anti-floating anchor rod is improved, namely, a multi-positioning anti-drawing expansion head is arranged at the rod end and the rod body of the nonmetal anchor rod, and after the rod body is placed into a drilling hole and grouted to form the anchor rod, a quick drawing test device is adopted to carry out the anti-drawing bearing capacity and the deformation test of the anti-floating.
In order to achieve the purpose, the invention is realized by adopting a rapid drawing test device of the expanded head nonmetal anti-floating anchor rod, and the specific process is as follows:
(1) firstly, temporarily binding and fixing a non-metal porous rod body expansion head along a non-metal anchor rod body by using binding wires, then fixing the final position of the non-metal porous rod body expansion head by using a plurality of binding wires, then installing a rod body expansion head tightening bolt at the bottom of the non-metal porous rod body expansion head in a coupling connection mode (winding a proper amount of raw adhesive tape on the rod body), installing other non-metal porous rod body expansion heads and rod body expansion head tightening bolts according to the steps, and finally installing a horn-shaped internal thread rod end expansion head at the rod body end of the non-metal anti-floating anchor rod in;
(2) lowering the rod body of the nonmetal anti-floating anchor rod of the expansion head, pouring cement mortar with corresponding grade according to design requirements, and maintaining for 28 days;
(3) leveling the concrete at the bottom of the jack backing plate to ensure that the compactness and the rigidity of the concrete meet the test requirements, and avoiding the influence on the test result due to the settlement of the jack in the loading process, wherein the jack backing plate, the jack and the beam stool are sequentially placed at the leveling position to form a loading beam base;
(4) sequentially penetrating the loading beam, the beam base plate, the pressure sensor base plate and the hoop through the rod body of the nonmetal anti-floating anchor rod, and ensuring that the central axis of the circular holes of the loading beam, the beam base plate, the pressure sensor base plate and the hoop are collinear with the axis of the rod body of the nonmetal anti-floating anchor rod;
(5) screwing and installing a full-thread steel pipe in the outer sleeve on a rod body 5cm below the rod top of the non-metal anti-floating anchor rod body by using an adjustable wrench, and winding a proper amount of raw rubber tape at the installation position; installing split steel clamps and inserting wedge-shaped internal thread steel clamping pieces to ensure that the split steel clamps clamp the full thread steel pipe in the outer sleeve;
(6) the pressure sensor is connected, and the high-pressure oil pipe and the oil distribution valve are tightly connected with the jack, so that oil leakage at the connection part is avoided; and (4) installing an automatic displacement acquisition meter, starting a high-pressure oil pump, debugging the whole test device, starting a test, recording the load and the upward pulling amount, and finishing the drawing test.
The main body structure of the rapid drawing test device for the nonmetal anti-floating anchor rod of the expansion head comprises a nonmetal anti-floating anchor rod body, a full-thread steel pipe in a jacket, a wedge-shaped internal thread steel clamping piece, a split steel clamp, a hoop, a pressure sensor pad, a pressure sensor, a beam base plate, a loading beam, a beam stool, a jack base plate, an automatic displacement acquisition meter, a nonmetal porous rod body expansion head, a rod body expansion head tightening bolt, a horn-shaped internal thread rod end expansion head and an anchor forming hole; the non-metal anti-floating anchor rod body is of a Glass Fiber Reinforced Polymer (GFRP) full-thread solid rod-shaped structure, and can enhance the bond stress between the anchor rod body and the anchoring body; the inner diameter of the full-thread steel pipe in the outer sleeve is determined according to the diameter of the non-metal anti-floating anchor rod body, the full-thread steel pipe can be connected with the non-metal anti-floating anchor rod body in a thread coupling mode, the length of the full-thread steel pipe is calculated according to the pulling resistance limit bearing capacity of the anchor rod, 1.2 times of safety factor is guaranteed, sufficient mechanical biting force is guaranteed, and the shearing strength of the non-metal anti-floating anchor rod body in a pulling test can be improved; the wall thickness of the split steel fixture is 1.5cm, and the split steel fixture and the wedge-shaped internal thread steel clamping piece cooperatively act to clamp the full thread steel pipe in the outer sleeve; the front surface of the wedge-shaped internal thread steel clamping piece is provided with a tooth rib with a regular size; the hoop is cup-shaped, the inner diameter of the hoop can be used for an anchor rod to pass through from top to bottom, the upper wall is 2cm thick, and the lower wall is 4cm thick; a pressure sensor base plate is arranged below the hoop, the pressure sensor base plate and the beam base plate are both made of square steel plates with the thickness of 3cm and the side length of 30cm, and holes are reserved in the centers of the pressure sensor base plate, the pressure sensor and the beam base plate so that the rod body of the non-metal anti-floating anchor rod can freely penetrate through the holes; the pressure sensor is a string type force measuring device, is arranged between a pressure sensor base plate and a beam base plate, and is calibrated according to the specification before use to ensure accurate reading; the beam base plate is placed above the loading beam, the span of the loading beam is 1.5m, the loading beam is welded into a box-shaped structure with the width of 30cm and the height of 60cm by using steel plates with the thickness of 3cm, a certain number of longitudinal stiffening ribs are arranged in the loading beam along the span direction to ensure the structural stability of the loading beam, the number of the longitudinal stiffening ribs is determined according to the actual requirement, communicated holes are reserved on the upper flange and the lower flange of the middle-span loading beam so that a non-metal anti-floating anchor rod body and a full-thread steel pipe in an outer sleeve can freely pass through the holes, and the steel plates are welded at the; the beam stool is of a cuboid open latticed structure formed by welding profile steels, the length of the beam stool is 40cm, the width of the beam stool is 30cm, the height of the beam stool is 50cm, oil pipes of jacks on the side faces of the beam stool can freely penetrate through the beam stool, the beam stool is symmetrically placed on jack backing plates on two sides of a non-metal anti-floating anchor rod body, and the clear distance between the beam stool and the non-metal anti-floating anchor rod body is not less than 40 cm; a jack is arranged in the beam stool, and an oil distributing valve is arranged on a high-pressure oil pump matched with the jack during drawing to realize synchronous jacking of the loading beam; the top of the jack is connected with the loading beam, the lower part of the jack is connected with a jack backing plate, the jack backing plate is square with the side length of 50cm and is made of a 30cm thick steel plate, and the jack backing plates are symmetrically arranged on sand cushion layers on two sides of the non-metal anti-floating anchor rod and used for dispersing the stress of the jack on the ground and ensuring that the jack vertically and stably jacks the loading beam; four automatic displacement acquisition meters are arranged near the grouting body in the anchor hole and used for measuring the displacement of the grouting body in the anchor hole, and the automatic displacement acquisition meters are fixedly arranged on a matched positioning bracket; the nonmetal porous rod body expanding head is arranged at the lower part of the nonmetal anti-floating anchor rod body, the nonmetal porous rod body expanding head is made of the same material as the nonmetal anti-floating anchor rod body, the diameter of the nonmetal porous rod body expanding head is smaller than the diameter of a drilled hole, the thickness of the nonmetal porous rod body expanding head is 1cm, holes are reserved in the center and the periphery of the nonmetal porous rod body expanding head, the central hole diameter of the nonmetal porous rod body expanding head is larger than the diameter of a mortar aggregate, the nonmetal porous rod body expanding head is bound on the nonmetal anti-floating anchor rod body by adopting binding wires, the pulling resistance of the nonmetal anti-floating anchor rod body can be improved in multiple ways, and a; the material of the bolt screwed by the rod body expansion head is the same as that of the nonmetal anti-floating anchor rod body, the wall thickness is 2cm, and the bolt is connected with the nonmetal anti-floating anchor rod body in a thread coupling mode to provide enough mechanical biting force; the horn-shaped internal thread rod end expansion head is arranged at the bottom of the nonmetal anti-floating anchor rod body, the material of the horn-shaped internal thread rod end expansion head is the same as that of the nonmetal anti-floating anchor rod body, holes are reserved on the periphery of the horn-shaped internal thread rod end expansion head, the diameter of each hole is slightly larger than the particle size of mortar aggregate, so that mortar can enter the lower part of the horn-shaped internal thread rod end expansion head, and the anchor rod drill hole is completely; the bore diameter and the bore depth of the anchor forming hole are determined according to the design requirements, and the bore depth is 0.5m greater than the anchoring length of the anchor rod.
Before the device for the rapid drawing test of the nonmetal anti-floating anchor rod with the enlarged head is used, in order to ensure that the axis of the anchor rod is pulled during the drawing test, the axis of the rod body of the nonmetal anti-floating anchor rod, the central axis of the circular hole of the backing plate of the pressure sensor, the central axis of the circular hole of the backing plate of the beam, the central axis of the pressure sensor, the central axis of the through hole of the loading beam and the central axis of the circular hole of the split steel clamp are collinear to the greatest extent, the loading beam is horizontal to the.
Compared with the prior art, the anchor rod anti-floating device is convenient and fast to construct, simple to install, safe, reliable, strong in operability, high in testing precision, not prone to damage, reusable, low in cost, high in anti-pulling bearing capacity and durability, and capable of effectively improving anti-floating capacity of the anchor rod.
Description of the drawings:
fig. 1 is a schematic diagram of a principle of a main structure of a drawing test device for an enlarged footing non-metal anti-floating anchor rod.
Fig. 2 is a schematic diagram of a main structure principle of the enlarged footing nonmetal anti-floating anchor rod pull-out test device.
Fig. 3 is a plan view of the fully threaded steel pipe 2 in the jacket according to the present invention.
Fig. 4 is a top view of the wedge-shaped internal thread steel jaw 3 according to the invention.
Fig. 5 is a top view of the split steel jig 4 of the present invention.
Figure 6 is a top view of the collar 5 of the present invention.
Fig. 7 is a cross-sectional view of the load beam 9 according to the present invention.
Fig. 8 is a top view of a non-metallic porous shaft enlarged head 14 according to the present invention.
Fig. 9 is a plan view of the shaft expansion head tightening bolt 15 according to the present invention.
Fig. 10 is a top view of the flared internally threaded rod end enlarged head 16 according to the present invention.
Fig. 11 is a graph of anchor rod load versus displacement according to an embodiment of the present invention.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example (b):
this embodiment adopts the nonmetal anti-floating anchor rod of enlarged footing to draw test device fast and realizes, and its specific process is:
(1) firstly, temporarily binding and fixing a non-metal porous rod body expansion head 14 along a non-metal anchor rod body by using binding wires, then fixing the final position of the non-metal porous rod body expansion head by using a plurality of binding wires, then installing a rod body expansion head tightening bolt 15 at the bottom of the non-metal porous rod body expansion head 14 in a coupling connection mode (winding a proper amount of raw adhesive tape on the rod body), installing the rest non-metal porous rod body expansion heads 14 and the rod body expansion head tightening bolt 15 according to the steps, and finally installing a horn-shaped internal thread rod end expansion head 16 at the rod end of the non-metal anti-floating anchor rod body;
(2) lowering the rod body 1 of the nonmetal anti-floating anchor rod of the expansion head, pouring cement mortar with corresponding grade according to design requirements, and maintaining for 28 days;
(3) leveling the concrete at the bottom of the jack backing plate 12 to ensure that the compactness and the rigidity of the concrete meet the test requirements, avoiding the influence on the test result due to the settlement of the jack in the loading process, and sequentially placing the jack backing plate 12, the jack 11 and the beam stool 10 at the leveling position to form a base of the loading beam 9;
(4) sequentially penetrating a loading beam 9, a beam backing plate 8, a pressure sensor 7, a pressure sensor backing plate 6 and a hoop 5 through the non-metal anti-floating anchor rod body 1, and ensuring that the central axis of the circular holes of the loading beam 9, the beam backing plate 8, the pressure sensor backing plate 6 and the hoop 5 is collinear with the axis of the non-metal anti-floating anchor rod body 1;
(5) screwing and installing an inner-sleeve full-thread steel pipe 2 on a rod body 5cm below the top of a rod body 1 of the non-metal anti-floating anchor rod by using an adjustable wrench, and winding a proper amount of raw rubber tape at the installation position; installing a split steel fixture 4 and inserting the wedge-shaped internal thread steel clamping piece 3 to ensure that the split steel fixture 4 clamps the full thread steel pipe 2 in the jacket;
(6) the pressure sensor 7 is connected, and the high-pressure oil pipe and the oil distributing valve are tightly connected with the jack 11, so that oil leakage at the connection part is avoided; installing an automatic displacement acquisition meter 13, starting a high-pressure oil pump and debugging equipment, starting a test, recording load and upper pulling amount, wherein an anchor rod load-displacement curve is shown in figure 11, and a specific test result is shown in table 1:
table 1:
wherein G in G28-01 represents the anti-floating anchor rod made of the glass fiber composite material, 28 represents that the diameter of the anchor rod is 28mm, 01 represents the first anchor rod, and the like.
The main body structure of the rapid drawing test device for the nonmetal anti-floating anchor rod of the expansion head comprises a nonmetal anti-floating anchor rod body 1, a full-thread steel pipe 2 in a jacket, a wedge-shaped internal thread steel clamping piece 3, a split steel clamp 4, a hoop 5, a pressure sensor pad 6, a pressure sensor 7, a beam backing plate 8, a loading beam 9, a beam stool 10, a jack 11, a jack backing plate 12, an automatic displacement acquisition meter 13, a nonmetal porous rod body expansion head 14, a rod body expansion head tightening bolt 15, a horn-shaped internal thread rod end expansion head 16 and an anchor forming hole 17; the non-metal anti-floating anchor rod body 1 is of a Glass Fiber Reinforced Polymer (GFRP) full-thread solid rod-shaped structure and can enhance the bond stress between the anchor rod body and an anchoring body; the inner diameter of the full-thread steel pipe 2 in the outer sleeve is determined according to the diameter of the nonmetal anti-floating anchor rod body 1, the full-thread steel pipe can be connected with the nonmetal anti-floating anchor rod body 1 in a thread coupling mode, the length of the full-thread steel pipe is calculated according to the pulling resistance limit bearing capacity of the anchor rod, 1.2 times of safety factor is guaranteed, sufficient mechanical biting force is guaranteed, and the shearing strength of the nonmetal anti-floating anchor rod body 1 in a pulling test can be improved; the wall thickness of the split steel fixture 4 is 1.5cm, and the split steel fixture 4 and the wedge-shaped internal thread steel clamping piece 3 cooperatively act to clamp the full thread steel pipe 2 in the outer sleeve; the front surface of the wedge-shaped internal thread steel clamping piece 3 is provided with a tooth rib with regular size; the hoop 5 is cup-shaped, the inner diameter of the hoop can be used for an anchor rod to pass through from top to bottom, the upper wall is 2cm thick, and the lower wall is 4cm thick; a pressure sensor base plate 6 is arranged below the hoop 5, the pressure sensor base plate 6 and the beam base plate 8 are both made of square steel plates with the thickness of 3cm and the side length of 30cm, and holes are reserved in the centers of the pressure sensor base plate 6, the pressure sensor 7 and the beam base plate 8 so that the non-metal anti-floating anchor rod body 1 can freely penetrate through the holes; the pressure sensor 7 is a string type force measuring device, is arranged between the pressure sensor base plate 6 and the beam base plate 8, and is calibrated according to the specification before use to ensure accurate reading; the beam backing plate 8 is placed above the loading beam 9, the span of the loading beam 9 is 1.5m, the loading beam 9 is welded into a box-shaped structure with the width of 30cm and the height of 60cm by using steel plates with the thickness of 3cm, a certain number of longitudinal stiffening ribs are arranged in the loading beam 9 along the span direction to ensure the structural stability of the loading beam, communicated holes are reserved on the upper flange and the lower flange of the middle loading beam 9 so that the non-metal anti-floating anchor rod body 1 and the full-thread steel pipe 2 in the outer sleeve can freely pass through the holes, and the lower flange jack loading position of the beam is welded with steel; the beam stool 10 is of a cuboid open latticed structure formed by welding section steel, the length of the beam stool is 40cm, the width of the beam stool is 30cm, the height of the beam stool is 50cm, oil pipes of jacks 11 on the side faces of the beam stool 10 can freely penetrate through the oil pipes, the beam stool 10 is symmetrically placed on jack backing plates 12 on two sides of a non-metal anti-floating anchor rod body 1, and the clear distance between the beam stool 10 and the non-metal anti-floating anchor rod body 1 is not less than 40 cm; a jack 11 is arranged in the beam stool 10, and an oil distributing valve is arranged on a high-pressure oil pump matched with the jack during drawing to realize synchronous jacking of the loading beam 9; the top of the jack 11 is connected with the loading beam 9, the lower part of the jack is connected with a jack backing plate 12, the jack backing plate 12 is a square with the side length of 50cm and is made of a steel plate with the thickness of 30cm, the jack backing plate 12 is symmetrically arranged on sand cushion layers on two sides of the non-metal anti-floating anchor rod 1 and used for dispersing the stress of the jack 11 to the ground and ensuring that the jack 11 vertically and stably jacks the loading beam 9; four automatic displacement acquisition meters 13 are arranged near the grouting body in the anchor forming hole 17 and used for measuring the displacement of the grouting body in the anchor forming hole 17, and the automatic displacement acquisition meters 13 are fixedly arranged on a matched positioning bracket; the nonmetal porous rod body expansion head 14 is arranged at the lower part of the nonmetal anti-floating anchor rod body 1, the nonmetal porous rod body expansion head is made of the same material as the nonmetal anti-floating anchor rod body 1, the diameter of the nonmetal porous rod body expansion head is smaller than the diameter of a drilled hole, the thickness of the nonmetal porous rod body expansion head is 1cm, a hole is reserved in the center and the periphery of the nonmetal porous rod body expansion head 14, the central aperture of the nonmetal porous rod body expansion head is larger than the diameter of the nonmetal anti-floating anchor rod body 1, the diameter of the peripheral hole is larger than the diameter of mortar aggregate, the nonmetal porous rod body expansion head 14 is bound on the nonmetal anti-floating anchor rod body 1 by adopting binding wires, the pulling-resistant; the material of the rod body expansion head screwing bolt 15 is the same as that of the nonmetal anti-floating anchor rod body 1, the wall thickness is 2cm, and the rod body is connected with the nonmetal anti-floating anchor rod body 1 in a thread coupling mode so as to provide enough mechanical biting force; the horn-shaped internal thread rod end expansion head 16 is arranged at the bottom of the nonmetal anti-floating anchor rod body 1, the material of the horn-shaped internal thread rod end expansion head is the same as that of the nonmetal anti-floating anchor rod body 1, holes are reserved on the periphery of the horn-shaped internal thread rod end expansion head 16, the diameter of each hole is slightly larger than the particle size of mortar aggregate, so that mortar can enter the lower part of the horn-shaped internal thread rod end expansion head 16, and the anchor rod drill hole is completely; the bore diameter and the bore depth of the anchor forming hole 17 are determined according to the design requirements, and the bore depth is 0.5m greater than the anchoring length of the anchor rod.
Claims (1)
1. The utility model provides a test method is drawn fast to nonmetal anti-floating anchor rod of enlarged footing, its characterized in that adopts the nonmetal anti-floating anchor rod of enlarged footing to draw test device fast and realizes, and its specific process is:
(1) firstly, temporarily binding and fixing a non-metal porous rod body expansion head along a non-metal anchor rod body by using binding wires, then fixing the final position of the non-metal porous rod body expansion head by using a plurality of binding wires, then installing a rod body expansion head tightening bolt at the bottom of the non-metal porous rod body expansion head in a coupling connection mode, installing other non-metal porous rod body expansion heads and rod body expansion head tightening bolts according to the steps, and finally installing a horn-shaped internal thread rod end expansion head at the rod end of the non-metal anti-floating anchor rod body in a coupling mode;
(2) lowering the rod body of the nonmetal anti-floating anchor rod of the expansion head, pouring cement mortar with corresponding grade according to design requirements, and maintaining for 28 days;
(3) leveling the concrete at the bottom of the jack backing plate to ensure that the compactness and the rigidity of the concrete meet the test requirements, and avoiding the influence on the test result due to the settlement of the jack in the loading process, wherein the jack backing plate, the jack and the beam stool are sequentially placed at the leveling position to form a loading beam base;
(4) sequentially penetrating the loading beam, the beam base plate, the pressure sensor base plate and the hoop through the rod body of the nonmetal anti-floating anchor rod, and ensuring that the central axis of the circular holes of the loading beam, the beam base plate, the pressure sensor base plate and the hoop are collinear with the axis of the rod body of the nonmetal anti-floating anchor rod;
(5) screwing and installing a full-thread steel pipe in the outer sleeve on a rod body 5cm below the rod top of the non-metal anti-floating anchor rod body by using an adjustable wrench, and winding a proper amount of raw rubber tape at the installation position; installing split steel clamps and inserting wedge-shaped internal thread steel clamping pieces to ensure that the split steel clamps clamp the full thread steel pipe in the outer sleeve;
(6) the pressure sensor is connected, and the high-pressure oil pipe and the oil distribution valve are tightly connected with the jack, so that oil leakage at the connection part is avoided; installing an automatic displacement acquisition meter, starting a high-pressure oil pump, debugging the whole test device, starting a test, recording load and pull-up amount, and finishing a pull-out test;
the main body structure of the rapid drawing test device for the nonmetal anti-floating anchor rod of the expansion head comprises a nonmetal anti-floating anchor rod body, a full-thread steel pipe in a jacket, a wedge-shaped internal thread steel clamping piece, a split steel clamp, a hoop, a pressure sensor pad, a pressure sensor, a beam backing plate, a loading beam, a beam stool, a jack backing plate, an automatic displacement acquisition meter, a nonmetal porous rod body expansion head, a rod body expansion head tightening bolt, a horn-shaped internal thread rod end expansion head and an anchor forming hole; the non-metal anti-floating anchor rod body is of a glass fiber reinforced polymer full-thread solid rod-shaped structure, and the gripping force between the anchor rod body and the anchoring body can be enhanced; the inner diameter of the full-thread steel pipe in the outer sleeve is determined according to the diameter of the non-metal anti-floating anchor rod body, the full-thread steel pipe can be connected with the non-metal anti-floating anchor rod body in a thread coupling mode, the length of the full-thread steel pipe is calculated according to the pulling resistance limit bearing capacity of the anchor rod, 1.2 times of safety factor is guaranteed, sufficient mechanical biting force is guaranteed, and the shearing strength of the non-metal anti-floating anchor rod body in a pulling test can be improved; the wall thickness of the split steel fixture is 1.5cm, and the split steel fixture and the wedge-shaped internal thread steel clamping piece cooperatively act to clamp the full thread steel pipe in the outer sleeve; the front surface of the wedge-shaped internal thread steel clamping piece is provided with a tooth rib with a regular size; the hoop is cup-shaped, the inner diameter of the hoop can be used for an anchor rod to pass through from top to bottom, the upper wall is 2cm thick, and the lower wall is 4cm thick; a pressure sensor base plate is arranged below the hoop, the pressure sensor base plate and the beam base plate are both made of square steel plates with the thickness of 3cm and the side length of 30cm, and holes are reserved in the centers of the pressure sensor base plate, the pressure sensor and the beam base plate so that the rod body of the non-metal anti-floating anchor rod can freely penetrate through the holes; the pressure sensor is a string type force measuring device, is arranged between a pressure sensor base plate and a beam base plate, and is calibrated according to the specification before use to ensure accurate reading; the beam base plate is placed above the loading beam, the span of the loading beam is 1.5m, the loading beam is welded into a box-shaped structure with the width of 30cm and the height of 60cm by using steel plates with the thickness of 3cm, a certain number of longitudinal stiffening ribs are arranged in the loading beam along the span direction to ensure the structural stability of the loading beam, the number of the longitudinal stiffening ribs is determined according to the actual requirement, communicated holes are reserved on the upper flange and the lower flange of the middle-span loading beam so that a non-metal anti-floating anchor rod body and a full-thread steel pipe in an outer sleeve can freely pass through the holes, and the steel plates are welded at the; the beam stool is of a cuboid open latticed structure formed by welding profile steels, the length of the beam stool is 40cm, the width of the beam stool is 30cm, the height of the beam stool is 50cm, oil pipes of jacks on the side faces of the beam stool can freely penetrate through the beam stool, the beam stool is symmetrically placed on jack backing plates on two sides of a non-metal anti-floating anchor rod body, and the clear distance between the beam stool and the non-metal anti-floating anchor rod body is not less than 40 cm; a jack is arranged in the beam stool, and an oil distributing valve is arranged on a high-pressure oil pump matched with the jack during drawing to realize synchronous jacking of the loading beam; the top of the jack is connected with the loading beam, the lower part of the jack is connected with a jack backing plate, the jack backing plate is square with the side length of 50cm and is made of a 30cm thick steel plate, and the jack backing plates are symmetrically arranged on sand cushion layers on two sides of the non-metal anti-floating anchor rod and used for dispersing the stress of the jack on the ground and ensuring that the jack vertically and stably jacks the loading beam; four automatic displacement acquisition meters are arranged near the grouting body in the anchor hole and used for measuring the displacement of the grouting body in the anchor hole, and the automatic displacement acquisition meters are fixedly arranged on a matched positioning bracket; the nonmetal porous rod body expanding head is arranged at the lower part of the nonmetal anti-floating anchor rod body, the nonmetal porous rod body expanding head is made of the same material as the nonmetal anti-floating anchor rod body, the diameter of the nonmetal porous rod body expanding head is smaller than the diameter of a drilled hole, the thickness of the nonmetal porous rod body expanding head is 1cm, holes are reserved in the center and the periphery of the nonmetal porous rod body expanding head, the central hole diameter of the nonmetal porous rod body expanding head is larger than the diameter of a mortar aggregate, the nonmetal porous rod body expanding head is bound on the nonmetal anti-floating anchor rod body by adopting binding wires, the pulling resistance of the nonmetal anti-floating anchor rod body can be improved in multiple ways, and a; the material of the bolt screwed by the rod body expansion head is the same as that of the nonmetal anti-floating anchor rod body, the wall thickness is 2cm, and the bolt is connected with the nonmetal anti-floating anchor rod body in a thread coupling mode to provide enough mechanical biting force; the horn-shaped internal thread rod end expansion head is arranged at the bottom of the nonmetal anti-floating anchor rod body, the material of the horn-shaped internal thread rod end expansion head is the same as that of the nonmetal anti-floating anchor rod body, holes are reserved on the periphery of the horn-shaped internal thread rod end expansion head, the diameter of each hole is slightly larger than the particle size of mortar aggregate, so that mortar can enter the lower part of the horn-shaped internal thread rod end expansion head, and the anchor rod drill hole is completely; the bore diameter and the bore depth of the anchor forming hole are determined according to the design requirements, and the bore depth is 0.5m greater than the anchoring length of the anchor rod.
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| CN108978734B (en) * | 2018-04-28 | 2024-08-20 | 青岛理工大学 | Indoor simulation test device for stress characteristics of fiber reinforced anti-floating anchor rod |
| CN110542359A (en) * | 2019-09-05 | 2019-12-06 | 华侨大学 | anti-floating anchor rod drawing test displacement measurement auxiliary device |
| CN112881180A (en) * | 2021-03-26 | 2021-06-01 | 青岛理工大学 | Device and method for rapidly detecting uplift bearing capacity of non-metal anchor rod |
| CN113236147B (en) * | 2021-06-16 | 2024-03-08 | 河南新开源石化管道有限公司 | Titanium alloy threaded oil pipe joint of oil and gas well and use method thereof |
| CN114737566A (en) * | 2022-05-12 | 2022-07-12 | 青岛理工大学 | Pre-tightening force applying device and method for large-diameter pre-tensioned glass fiber rib anti-floating anchor rod |
| CN116499885A (en) * | 2023-06-28 | 2023-07-28 | 矿冶科技集团有限公司 | Anchor rod drawing performance testing device and method |
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