CN208201956U - Indoor testing device for long-term uplift bearing capacity of fiber rib anti-floating anchor rod - Google Patents

Abstract

The utility model belongs to the technical field of foundation engineering test equipment, and relates to an indoor test device for the long-term pull-out bearing capacity of a fiber reinforcement anti-floating anchor rod. The rigid base is anchored on the rigid ground through a ground anchor screw and a ground anchor nut, and is welded to the rigid base. Ribs are welded at the feet of the first column and the second column on the top, the nut gasket is installed between the fiber reinforced anti-floating anchor rod body and the high-strength nut, the two ends of the rigid base are installed with guide steel brackets, and the concrete base is anchored by The system is fixedly installed on the rigid base, and the movable clamping device is used to set up the automatic displacement acquisition meter. The fixed clamp of the movable clamping device is screwed and fixed on the guide rigid bracket, and the rod wing is pasted on the fiber reinforced anti-floating anchor rod. The distance from the concrete 5cm from the top surface of the base body, the structure is simple, the construction and installation are convenient, safe and reliable, the device is complete and not easy to damage, the test accuracy is high, the operation is flexible, and the cost is low.

Description

An indoor test device for the long-term pull-out capacity of fiber-reinforced anti-floating anchor rods

Technical field:

The utility model belongs to the technical field of foundation engineering test equipment, and relates to a research on the pull-out bearing capacity and stress relaxation characteristics of fiber reinforcement anti-floating anchor rods in rock mass under long-term constant loads and a loading device thereof, in particular An indoor testing device for the long-term pull-out bearing capacity of a fiber-reinforced anti-floating bolt.

Background technique:

As a permanent component, the anti-floating anchor requires the service life of the anchor to be decades or even hundreds of years. The design of the anti-floating anchor in the prior art focuses on the short-term pull-out force and displacement of the anchor, and seldom cares about the anti-floating anchor. The long-term performance of the anchor (long-term pull-out capacity and long-term deformation). At present, regarding the design of permanent anchors, the method of increasing the safety factor is often adopted, which has great blindness. The anchors will creep and relax under the long-term constant load, resulting in the loss of anchoring force. In addition, anti-floating anchors in actual engineering tend to be basic tests, and pull-out tests under long-term loads are extremely rare, and engineers and technicians are concerned about the long-term pull-out capacity of anti-floating anchors. Since the steel is easy to corrode, the anti-floating anchor has a long-term alternating dry and wet environment, especially the durability of the anti-floating anchor in the environment with stray currents has been questioned. Fiber-reinforced anti-floating anchor is a new reinforcement material composed of resin and fiber materials. Compared with steel anchor, it has better mechanical properties, corrosion resistance, anti-electromagnetic interference and excellent fatigue resistance. characteristic. Chinese patent 201720304289.5 discloses a pull-out test device for research on the mechanical characteristics of anchors, including an anchor preparation system and a loading system; the anchor preparation system includes a system frame, a backing plate, a first shell and multiple second shells body, the loading system includes an axial force loading device and a normal force loading device. In the process of bolt pull-out test, it is possible to apply controllable normal stress to the bolt mortar body, which approximates the actual axial force of the bolt, so that the relevant axial force of the bolt The characteristic research results are more reasonable and applicable, and better serve the design and construction of the bolt, but the device can only simulate the axial and normal force of the bolt, and cannot measure the long-term pull-out capacity of the bolt Its analysis; 201710052406.8 discloses the test device and method for testing the anchor stress gauge under different working conditions. The test device includes a test platform, and the upper surface of the test platform is provided with two mutually perpendicular support tracks. Each support track Both of them are provided with a rolling support, the center of the upper part of the rolling support is provided with a rotating shaft, the top of the rotating shaft is provided with a clamping device, the anchor rod is clamped between the two rolling bearings, and the anchor rod stress is installed in the middle of the anchor rod. gauge, two strain gauges and two jacks, the anchor rod stress gauge and the strain gauge are connected with the data collector by the data line; the method comprises the following steps: (1) installing the test device; (2) installing the anchor rod; (3) Fixed rolling bearing; (4) data collector is installed; (5) bolt is tested; (6) data processing, the principle of the present invention is relatively simple, and the stressed state of simulated bolt is real, but in actual test The accuracy of the measurement data is not high, and the cost is high; 201420358169.X discloses a test bench for testing the comprehensive mechanical properties of anchor rods, which includes a propulsion and stirring test mechanism arranged on the installation test bench, Install the pre-tightening test mechanism and the bending load test mechanism, axial load test mechanism, shear load test mechanism and impact load test mechanism set on the working test bench; through this test bench, the simulation of anchor rod installation and testing in the laboratory can be realized. During the working process, single or multiple combined external forces such as torsion, stretching, bending, shearing and impact are applied to the anchor rod; the independent loading system is used to apply corresponding loads to the anchor rod, and the installation and working process of the anchor rod can be carried out separately. Independent tests of various loads, and combined loading tests of several arbitrary working forces such as tension, shear and impact caused by installation forces and deformation of surrounding rocks, so as to effectively test the effect of anchor bolts on various combinations of external forces Under the comprehensive mechanical properties, but the test bench is mainly used for mine support, and the structure is complex and inconvenient to operate. Therefore, seeking a reasonable, fast and effective long-term pull-out capacity test device for fiber-reinforced anti-floating anchors has very important theoretical significance and engineering applications for determining the long-term deformation characteristics and stress relaxation characteristics of anti-floating anchors value.

Invention content:

The purpose of the invention of this utility model is to overcome the shortcomings of the existing technology, and to provide a long-term pull-out bearing capacity indoor test of fiber reinforced anti-floating anchor rods by utilizing the principle of leverage on the premise of saving costs, ensuring test quality and improving test efficiency. The device is used to analyze the creep effect and stress relaxation phenomenon of the fiber-reinforced anti-floating anchor rod under long-term load by testing the stress change and uplift of the fiber-reinforced anti-floating anchor rod under long-term constant load, and the fiber-reinforced anti-floating anchor rod is obtained. The long-term pull-out bearing capacity of the floating anchor is to apply a long-term constant load to the fiber-reinforced anti-floating anchor in the rock and soil layer by using a lever loading system, and to implant a low-temperature-sensitive miniature fiber grating sensor string in the fiber-reinforced anti-floating anchor Test the axial stress change of the anchor rod, and install an automatic displacement acquisition meter to measure the uplift of the anchor rod body.

In order to achieve the above object, the main structure of the utility model includes a rigid base, a ground anchor screw, a ground anchor nut, a first column, a second column, a rib plate, a first beam, a second beam, a third beam, a fixed shaft, a The first beam connecting rod, the second beam connecting rod, the third beam connecting rod, counterweight, high-strength nut, nut washer, movable clamping device, guide steel bracket, automatic displacement acquisition meter, fiber reinforced anti-floating anchor rod body, low temperature Sensitive micro-fiber grating sensor string, concrete base, high-strength bolts, threaded holes in the base, steel pads, rod wings, the third beam fixed shaft, the first beam connecting rod fixed shaft, the second beam connecting rod fixed shaft, the third beam connecting rod Rod fixing shaft; rigid base, ground anchor screw, ground anchor bolt, first column, second column, rib plate, first beam, second beam, third beam, first beam fixing shaft, first beam connecting rod, The second beam connecting rod, the third beam connecting rod, the counterweight, the third beam connecting rod fixed shaft, the first beam connecting rod fixed shaft, the second beam connecting rod fixed shaft, and the third beam connecting rod fixed shaft form a lever loading system, The four corners of the rigid base are reserved with holes with a diameter of 7 cm. The ground anchor screw is coupled with the ground anchor nut through the hole reserved in the rigid base. The rigid base is anchored on the rigid ground through the ground anchor screw and the ground anchor nut. The first column and The second column is vertically welded on the rigid base respectively, and ribs are welded at the foot of the first column and the second column to increase the stability of the first column and the second column; one end of the first beam passes through the second column A beam fixing shaft is horizontally fixed on the first column, and the lower part of the other end is welded to the first beam connecting rod fixed on the second beam, and the first beam connecting rod is fixed vertically upward through the first beam connecting rod fixing shaft. On the right part of the second crossbeam, one end of the connecting rod of the second crossbeam is fixed vertically upward on the third crossbeam through the fixing shaft of the second crossbeam connecting rod, and the other end is welded under the left part of the second crossbeam, and one end of the connecting rod of the third crossbeam passes through The connecting rod fixing shaft of the third beam is fixed vertically downward on the third beam, and the other end is connected with the counterweight; the left end of the first beam and the right end of the second beam are respectively vertically inserted into the fiber reinforced anti-floating anchor rod body, high strength Nuts and nut washers together constitute the pullout anchor of the fiber-reinforced anti-floating anchor rod body. The fiber-reinforced anti-floating anchor rod body and the high-strength nut are connected through thread coupling, and the nut washer is installed on the fiber-reinforced anti-floating anchor rod body and the high-strength nut. In between, the two ends of the rigid base are symmetrically installed with guide steel brackets, and the fiber-reinforced anti-floating anchor rod body is planted with low-temperature-sensitive micro-fiber grating sensor strings in quasi-distribution to eliminate the influence of grating parameter changes caused by temperature to the greatest extent. Accurately measure the deformation of the fiber-reinforced anti-floating anchor rod body under long-term load; the lower end of the fiber-reinforced anti-floating anchor rod body is placed in the concrete matrix, and the four corners of the concrete matrix are vertically provided with base threaded holes, high-strength The bolts pass through the threaded holes of the base to connect with the steel pads. The high-strength bolts, the threaded holes of the base and the steel pads together constitute the anchoring system of the concrete base. The concrete base is fixed and installed on the rigid base through the anchoring system. The movable clamping device and automatic displacement acquisition The displacement test system is composed of the meter and the rod wing. The movable clamping device is used to set up the automatic displacement acquisition meter. One end of the movable clamping device is The fixing clip is screwed and fixed on the guide rigid bracket, which can move up and down flexibly. The automatic displacement acquisition meter is used to measure the uplift in the concrete matrix. The rod wing is pasted on the fiber reinforced anti-floating anchor rod with epoxy resin. At 5cm from the top surface, a measuring point for testing the deformation of the rod body is provided for the automatic displacement acquisition meter.

The rigid base described in the utility model is made of a steel rectangular bottom plate with a length of 2.4m, a width of 1.2m, and a thickness of 5cm; the ground anchor screw adopts a steel casting body, and one end of the ground anchor screw is designed to be 25cm long, 10cm wide, and 10cm high. Enlarging head structure, the other end is a cylindrical structure with threads and a diameter of 6cm; the ground anchor nut adopts a steel casting body with a wall thickness of 4cm, and is connected with the ground anchor screw through threaded coupling; both the first column and the second column are made of 140mm×60mm×8mm channel steel, holes with a diameter of 50mm are reserved on the top of the first column and the second column, which are respectively used to install the first beam fixed shaft and the third beam fixed shaft; the first beam fixed shaft, the third beam fixed shaft The fixed shaft, the fixed shaft of the first beam connecting rod, the fixed shaft of the second beam connecting rod and the fixed shaft of the third beam connecting rod are all composed of high-strength pins and high-strength nuts. The diameter of the high-strength bolt of the shaft is 40mm, and the diameter of the high-strength pin bolts of the first beam connecting rod fixed shaft, the second beam connecting rod fixed shaft and the third beam connecting rod fixed shaft is 30mm. When installing the above fixed shafts, butter should be applied to reduce the Friction; the ribs are made of steel with a thickness of 0.8cm, and its shape is a right-angled trapezoid with a length of 20cm on the upper side, a length of 30cm on the lower side, and a height of 30cm; the first beam, the second beam, and the third beam are all 8cm wide and thick 12cm steel material, the lengths are 1.6m, 1.3m, 1.0m respectively. The diameter of the hole connecting the first beam and the third beam to the first column and the second column is 50mm, and the diameter of the hole connecting the second beam to the first beam The diameter of the holes connecting the second beam connecting rod and the third beam connecting rod to the third beam and the third beam are both 40mm in diameter, and the left end of the first beam and the right end of the second beam are respectively reserved for the anti-floating anchor rod body of the fiber reinforcement to pass through The hole, its aperture is slightly larger than the diameter of the fiber reinforcement anti-floating anchor rod body; the first beam connecting rod, the second beam connecting rod, and the third beam connecting rod all adopt steel materials with a length of 30cm, a width of 6cm, and a thickness of 2cm.

The guide rigid bracket described in the utility model is welded by smooth round steel bars, and a steel ring is welded on the guide rod used to ensure the verticality of the fiber bar anti-floating anchor rod body, and the diameter of the steel ring is slightly larger than that of the fiber bar anti-floating The diameter of the anchor rod body; the high-strength nut adopts a hexagonal nut with a wall thickness of 3cm, and the nut gasket is a circular steel sheet, whose inner diameter is slightly larger than the diameter of the fiber-reinforced anti-floating anchor rod body, and the outer diameter is larger than the outer diameter of the high-strength nut; the rod wing It is welded by 5cm×5cm×0.5cm angle iron and a semicircular steel pipe with an inner diameter of 2cm and a wall thickness of 0.3cm. The fiber reinforced anti-floating anchor rod body is a glass fiber reinforced polymer (GFRP) fully threaded solid rod structure, and the concrete matrix For simulating rocks, a cast-in-place reinforced concrete cuboid structure with a height of 1m, a length of 60cm, and a width of 60cm is generally used. The concrete strength grade is determined by the uniaxial compressive strength of the rock. The steel bars are HRB400; The rod has a diameter of 5cm and a length of 2.2m. The depth of the threaded hole of the base is 3cm. The steel spacer is a square steel block of 8cm×8cm×4cm, and a circular hole with a diameter of 6cm is formed at its center.

The movable clamping device described in the utility model is composed of a fixed clamp, a magnetic suction base, a first direction regulator, a first steel chain rod, a second direction regulator, a second steel chain rod, and a guide clamp. The way of screwing and clamping is fixed on the guide rigid bracket, the magnetic suction base is magnetically adsorbed on the vertical plane of the fixing clip, one end of the first direction adjuster is welded to the magnetic suction base, and the other end is fixedly connected to the first steel chain rod , one end of the second direction adjuster is connected with the first steel chain rod, and the other end is connected with the second steel chain rod, the first steel chain rod and the second steel chain rod are fixed by fastening bolts, the first steel chain rod The length and angle of the second steel chain rod can be adjusted flexibly. One end of the guide holder and one end of the second steel chain rod are connected by thread coupling, and the other end is fixed with an automatic displacement acquisition meter by fastening bolts. The guide clip The holder is installed between the second steel chain rod and the automatic displacement acquisition meter. A level is formed on the upper surface of the guide holder, which is used to adjust the level of the guide holder to ensure the verticality of the automatic displacement acquisition meter, thereby making the displacement The test is accurate.

The specific process of the utility model for the indoor test of the long-term pull-out bearing capacity of the fiber reinforced anti-floating anchor rod is as follows:

(1) To install the lever loading system, first fix the rigid base on the rigid ground with the ground anchor screw and the ground anchor nut, then weld the first column and the second column to the rigid base, and respectively connect the first column and the second column Weld the rib plate at the base of the column to increase its stability. When welding, ensure the length and strength of the weld seam of the first column, the second column and the rib plate, and the verticality of the column. Then build the lever, first use the first beam to fix the shaft and the third beam Fix the shaft to connect the first beam and the third beam to the first column and the second column respectively, and temporarily build supports to ensure the level of the first beam and the third beam, and then use the first beam connecting rod to fix the shaft and the second beam connecting rod Install the second beam on the fixed shaft, the first beam connecting rod and the second beam connecting rod, and finally install the third beam connecting rod on the third beam with the fixed shaft of the third beam connecting rod. When installing the above fixed shaft, apply butter and The external support only keeps the third beam horizontal, and the lever loading system is installed;

(2) Installing the fiber-reinforced anti-floating anchor rod body: First, two fiber-reinforced anti-floating anchor rod bodies with low-temperature-sensitive micro-fiber grating sensor strings are respectively passed through the reserved holes at the left end of the first crossbeam and the right end of the second crossbeam, and then Use high-strength nuts and nut washers to pass through the fiber-reinforced anti-floating anchor rod body above the reserved hole from top to bottom, and secure it firmly by thread coupling. Before installation, ensure that the fiber-reinforced anti-floating anchor rod The anchorage length of the rod body in the concrete matrix is determined according to the test requirements, and the verticality of the fiber reinforcement anti-floating anchor rod body is ensured by means of the guide rigid bracket. During the entire installation process, care should be taken to protect the low temperature sensitive micro fiber grating sensor from damage;

(3) form base plate anchoring structure: insert the PVC pipe that outer surface is coated with organic oil length 1.2m, diameter 5cm on the base threaded hole 24 of rigid base earlier, and seal the upper top surface of base threaded hole with white tape to avoid slurry from flowing into, Then support the formwork of the concrete matrix, bind the steel bars, and ensure the relative position of the concrete matrix and the anti-floating anchor rod body of the fiber reinforcement, and finally pour the concrete to make the standard test piece and maintain it to the age, and take out the PVC pipe to form the bottom plate before the final setting of the concrete Anchoring structure;

(4) First fix the concrete matrix on the rigid base with high-strength bolts and steel pads, use commercially available structural glue to paste the rod wings on the body of the fiber-reinforced anti-floating anchor rod, and temporarily bind and fix them with tie wires, and maintain them until the structure After the glue is fully cured under natural conditions for 1 day, the tie wire is removed, and then four automatic displacement acquisition meters are respectively erected on the pole wing and the concrete substrate with a movable clamping device, and the automatic displacement acquisition meter is connected with the low temperature sensitive micro fiber grating. The sensor string is connected to the external acquisition system, pre-applied half of the first-level load (0.1 times the estimated limit load), and recorded the initial readings, eliminating the test error caused by the rapid loading, and then applying the required long-term load. Heavy block weight, start the test;

(5) Measurement and reading data, observe the test at different time periods and time points to obtain the deformation of the fiber reinforced anti-floating anchor under long-term constant load, the test loading, unloading and termination loading conditions, and the criteria for determining the anchor failure According to the "Technical Regulations for Building Foundation Pit Support" (JGJ120-2012)).

Before the utility model is used, the formwork support and pouring of the concrete matrix and the installation of the fiber-reinforced anti-floating anchor rod body are all carried out on the test device, and the axis of the fiber-reinforced anti-floating anchor rod body is pulled when being pulled; Before the test, ensure that the low-temperature-sensitive micro-fiber grating sensor string and the automatic displacement acquisition meter are working normally, and collect initial data; calculate the weight of the counterweight that needs to be applied through static force balance.

Because the utility model is difficult to obtain the rock of specific shape, even if it can be obtained, it cannot guarantee its integrity after drilling. Rock anchoring.

Compared with the prior art, the utility model has the advantages of simple structure, convenient construction and installation, safety and reliability, complete device and not easy to be damaged, high test accuracy, flexible operation, low cost, and can provide lasting and constant pulling force, which can effectively improve the Anti-floating ability, while testing the stress change and uplift of the fiber-reinforced anti-floating anchor rod under long-term constant load.

Description of drawings:

Fig. 1 is a schematic diagram of the main structure of the utility model.

Fig. 2 is a top view of the main structure of the utility model.

Fig. 3 is a schematic diagram of the structural principle of the ground anchor screw described in the present invention.

Fig. 4 is a schematic diagram of the structural principle of the first beam fixing shaft of the present invention, wherein (a) is a front view, and (b) is a top view.

Fig. 5 is a structural top view of the high-strength nut described in the present invention.

Fig. 6 is a structural top view of the nut washer of the present invention.

Fig. 7 is a schematic diagram of the principle structure of the main body of the movable clamping device of the present invention.

Fig. 8 is a schematic diagram of the structural principle of the high-strength bolt described in the present invention.

Fig. 9 is a schematic diagram of the principle structure of the main body of the rod wing described in the present invention, wherein (a) is a front view, and (b) is a top view.

Detailed ways:

Below by embodiment and in conjunction with accompanying drawing, the utility model is further described.

Example:

The main structure of this embodiment includes a rigid base 1, a ground anchor screw 2, a ground anchor nut 3, a first column 4, a second column 5, a rib 6, a first beam 7, a second beam 8, a third beam 9, Fixed shaft 10, first beam connecting rod 11, second beam connecting rod 12, third beam connecting rod 13, counterweight 14, high-strength nut 15, nut washer 16, movable clamping device 17, guide steel bracket 18, Automatic displacement acquisition meter 19, fiber reinforcement anti-floating anchor rod body 20, low temperature sensitive micro fiber grating sensor string 21, concrete base 22, high strength bolt 23, base threaded hole 24, steel pad 25, rod wing 26, third beam fixation Shaft 27, first crossbeam connecting rod fixed shaft 28, second crossbeam connecting rod fixed shaft 29, third crossbeam connecting rod fixed shaft 30; rigid base 1, ground anchor screw 2, ground anchor bolt 3, first column 4, the first Second column 5, rib plate 6, first beam 7, second beam 8, third beam 9, first beam fixing shaft 10, first beam connecting rod 11, second beam connecting rod 12, third beam connecting rod 13 , counterweight 14, the third crossbeam fixed shaft 27, the first crossbeam connecting rod fixed shaft 28, the second crossbeam connecting rod fixed shaft 29, and the third crossbeam connecting rod fixed shaft 30 form a lever loading system, and the four corners of the rigid base 1 are reserved There is a hole with a diameter of 7cm. The ground anchor screw 2 passes through the hole reserved in the rigid base 1 and is coupled with the ground anchor nut 3. The rigid base 1 is anchored on the rigid ground through the ground anchor screw 2 and the ground anchor nut 3. The first column 4 and the second column 5 are respectively vertically welded on the rigid base 1, and ribs 6 are welded at the foot of the first column 4 and the second column 5 to increase the stability of the first column 4 and the second column 5 One end of the first crossbeam 7 is horizontally fixed on the first column 4 by the first crossbeam fixed shaft 10, and the other end below is welded with the first crossbeam connecting rod 11 fixed on the second crossbeam 8, the first crossbeam connecting rod 11 The first crossbeam connecting rod fixing shaft 28 is fixed vertically upward on the right part of the second crossbeam 8, and one end of the second crossbeam connecting rod 12 is vertically upwardly fixed on the third crossbeam 9 through the second crossbeam connecting rod fixing shaft 29, The other end is welded below the left part of the second crossbeam 8, and one end of the third crossbeam connecting rod 13 is fixed vertically downward on the third crossbeam 9 through the third crossbeam connecting rod fixing shaft 30, and the other end is connected with the counterweight 14; The left end of the first crossbeam 7 and the right end of the second crossbeam 8 are respectively vertically inserted into the fiber reinforcement anti-floating anchor rod body 20, and the high-strength nut 15 and the nut washer 16 together constitute the pulling anchor of the fiber reinforcement anti-floating anchor rod body 20, The fiber-reinforced anti-floating anchor body 20 and the high-strength nut 15 are connected through thread coupling, the nut gasket 16 is installed between the fiber-reinforced anti-floating anchor body 20 and the high-strength nut 15, and the two ends of the rigid base 1 are symmetrically installed with guide steel brackets 18. The low-temperature-sensitive miniature optical fiber grating sensor strings 21 are planted in quasi-distributed inside the fiber reinforcement anti-floating bolt body 20, which can eliminate the influence of grating parameter changes caused by temperature to the greatest extent and accurately measure the fiber reinforcement resistance under long-term load. The amount of deformation of the floating anchor rod body 20; the lower end of the fiber reinforcement anti-floating anchor rod body 20 is placed in the concrete matrix 22, and the concrete The four corners of the matrix 22 are vertically provided with base threaded holes 24, and the high-strength bolts 23 pass through the base threaded holes 24 to connect with the steel pads 25. An anchoring system, the concrete base 22 is fixedly installed on the rigid base 1 through the anchoring system, the movable clamping device 17, the automatic displacement acquisition meter 19, and the rod wing 26 together constitute a displacement testing system, and the movable clamping device 17 is used to set up the automatic displacement acquisition Meter 19, the fixed clamp 17-1 at one end of the movable clamping device 17 is screwed and fixed on the guide rigid support 18, which can move up and down flexibly. The automatic displacement acquisition meter 19 is used to measure the amount of uplift in the concrete matrix 22, and the rod wing 26 Use epoxy resin to paste on the fiber reinforcement anti-floating anchor rod body 20 at a distance of 5 cm from the top surface of the concrete matrix 22 to provide a measuring point for the automatic displacement acquisition meter 19 to test the deformation of the rod body.

The rigid base 1 described in this embodiment is made of a steel rectangular base plate with a length of 2.4m, a width of 1.2m, and a thickness of 5cm; A 10cm-high enlarged head structure, the other end is a cylindrical structure with threads and a diameter of 6cm; the ground anchor nut 3 adopts a steel casting body with a wall thickness of 4cm, and is connected with the ground anchor screw rod 2 through threaded coupling; the first column 4 Both the first column 4 and the second column 5 are made of 140mm×60mm×8mm channel steel, and holes with a diameter of 50mm are reserved on the tops of the first column 4 and the second column 5, which are respectively used to install the first beam fixing shaft 10 and the third beam fixing shaft 27. The first crossbeam fixed shaft 10, the third crossbeam fixed shaft 27, the first crossbeam connecting rod fixed shaft 28, the second crossbeam connecting rod fixed shaft 29 and the third crossbeam connecting rod fixed shaft 30 are all made of high-strength pins and high-strength nuts Threaded coupling connection, wherein the diameter of the high-strength bolts of the first beam fixing shaft 10 and the third beam fixing shaft 27 is 40 mm, the first beam connecting rod fixing shaft 28, the second beam connecting rod fixing shaft 29 and the third beam connecting rod are fixed The diameter of the high-strength pin of the shaft 30 is 30mm. When installing the above-mentioned fixed shaft, butter should be applied to reduce friction; 30cm, 30cm high; the first beam 7, the second beam 8, and the third beam 9 are made of steel with a width of 8cm and a thickness of 12cm, and the lengths are 1.6m, 1.3m, and 1.0m respectively. The first beam 7 and the third beam 9 The diameter of the hole connected to the first column 4 and the second column 5 is 50 mm, the hole connected to the second beam 8 and the first beam connecting rod 11, the third beam 9 is connected to the second beam connecting rod 12 and the third beam respectively The diameters of the holes connecting the connecting rods 13 are both 40mm. The left end of the first crossbeam 7 and the right end of the second crossbeam 8 are respectively reserved for the passage of the fiber-reinforced anti-floating anchor rod body 20. The apertures are slightly larger than the fiber-reinforced anti-floating anchor. The diameter of the rod body 20; the first crossbeam connecting rod 11, the second crossbeam connecting rod 12, and the third crossbeam connecting rod 13 all adopt steel materials with a length of 30cm, a width of 6cm, and a thickness of 2cm.

The guide rigid support 18 described in this embodiment is welded by light round steel bars, and a steel ring is welded on the guide rod for ensuring the verticality of the fiber bar anti-floating anchor rod body 20, and the diameter of the steel ring is slightly larger than the fiber bar Anti-floating anchor rod body 20 diameters; high-strength nut 15 adopts a hexagonal nut with a wall thickness of 3 cm, and nut gasket 16 is a circular steel sheet, its inner diameter is slightly larger than the diameter of the fiber-reinforced anti-floating anchor rod body 20, and its outer diameter is larger than the high-strength nut The outer diameter of 15; the rod wing 26 is welded by angle iron of 5 cm × 5 cm × 0.5 cm and a semicircular steel pipe with an inner diameter of 2 cm and a wall thickness of 0.3 cm, and the fiber reinforced anti-floating anchor rod body 20 is glass fiber reinforced polymer (GFRP) Fully threaded solid rod-shaped structure, the concrete matrix 22 is used to simulate the rock, and generally adopts a cast-in-place reinforced concrete cuboid structure with a height of 1m, a length of 60cm, and a width of 60cm. The concrete strength grade is determined by the uniaxial compressive strength of the rock, and the steel bar is HRB400; High-strength bolt 23 adopts the lower end to be shaped on the steel bar member of screw thread, and its diameter is 5cm, and length is 2.2m, and the hole depth of base threaded hole 24 is 3cm, and steel block 25 is the square steel block of 8cm * 8cm * 4cm, and its A circular hole with a diameter of 6 cm is formed at the center.

The movable clamping device 17 described in this embodiment consists of a fixed clamp 17-1, a magnetic suction base 17-2, a first direction regulator 17-3, a first steel chain rod 17-4, and a second direction regulator 17-5. , the second steel chain rod 17-6, and a guide holder 17-7. The fixing clip 17-1 is fixed on the guide bracket 18 by screwing and clamping, and the magnetic suction base 17-2 is magnetically adsorbed on the fixing clip. On the vertical plane of 17-1, one end of the first direction adjuster 17-3 is welded with the magnetic suction base 17-2, and the other end is fixedly connected with the first steel chain bar 17-4, and the second direction adjuster 17-5 One end is connected with the first steel chain rod 17-4, and the other end is connected with the second steel chain rod 17-6, and the first steel chain rod 17-4 and the second steel chain rod 17-6 are fixed by fastening bolts , the length and angle of the first steel chain bar 17-4 and the second steel chain bar 17-6 can be flexibly adjusted, and one end of the guide holder 17-7 is threadedly coupled with one end of the second steel chain bar 17-6 connected, the other end is fixed with an automatic displacement acquisition meter 19 by fastening bolts, and the guide holder 17-7 is installed between the second steel chain rod 17-6 and the automatic displacement acquisition meter 19, and the guide holder 17-7 The upper surface of the upper surface is formed with a level, which is used to adjust the level of the guide holder 17-7 to ensure the verticality of the automatic displacement acquisition meter 19, and then make the displacement test accurate.

In this embodiment, the specific process of indoor testing the long-term pull-out bearing capacity of the fiber-reinforced anti-floating anchor is as follows:

(1) To install the lever loading system, first fix the rigid base 1 on the rigid ground with the ground anchor screw 2 and the ground anchor nut 3, then weld the first column 4 and the second column 5 to the rigid base 1, and respectively place them on the first Weld the rib plate 6 at the foot of the column 4 and the second column 5 to increase its stability, and ensure that the weld length and strength of the first column 4, the second column 5 and the rib plate 6 and the verticality of the column are within ± 1mm during welding. Then build the lever, first the first beam 7 and the third beam 9 are connected with the first column 4 and the second column 5 with the first beam fixed shaft 10 and the third beam fixed shaft 27, and temporarily build support to ensure that the first beam 7 and the third crossbeam 9 level, then install the second crossbeam 8 with the first crossbeam connecting rod fixed shaft 28, the second crossbeam connecting rod fixed shaft 29, the first crossbeam connecting rod 11 and the second crossbeam connecting rod 12, and finally use the first crossbeam connecting rod Install the third beam connecting rod 13 on the third beam 9 with the fixed shaft 30 of the three beam connecting rod. When installing the above-mentioned fixed shaft, grease should be applied, and external support should be added to keep the third beam 9 horizontal, and the installation of the lever loading system is completed;

(2) Install the fiber-reinforced anti-floating anchor body 20: first, two fiber-reinforced anti-floating anchor bodies 20 planted with low-temperature-sensitive miniature optical fiber grating sensor strings 21 respectively pass through the left end of the first crossbeam 7 and the right end of the second crossbeam 8 Reserve a hole, and then use high-strength nut 15 and nut washer 16 to pass through the fiber reinforced anti-floating anchor rod body 20 above the reserved hole position from top to bottom, and fix it firmly by thread coupling. To ensure the anchorage length of the fiber reinforced anti-floating anchor rod body 20 in the concrete matrix 22, the anchorage length is determined according to the test requirements, and the verticality of the fiber reinforced anti-floating anchor rod body 20 is guaranteed to be within ±1 mm by means of the guide rigid bracket 18. The entire installation During the process, pay attention to protect the low temperature sensitive micro fiber grating sensor from damage;

(3) Form the bottom plate anchoring structure: first insert a PVC pipe whose outer surface is coated with oil and has a length of 1.2m and a diameter of 5cm on the base threaded hole 24 of the rigid base 1, and seal the upper top surface of the base threaded hole 24 with white tape to avoid slurry Inflow, then the formwork of the support concrete matrix 22, the binding steel bars, and ensure the relative position of the concrete matrix 22 and the anti-floating anchor rod body 20 of the fiber reinforcement, and finally pour concrete to make a standard test piece and maintain it to the age, and place it before the final setting of the concrete. The PVC pipe is taken out to form the bottom plate anchor structure;

(4) First fix the concrete matrix 22 on the rigid base 1 with high-strength bolts 23 and steel pads 25, use commercially available structural glue to paste the rod wings 26 on the fiber reinforcement anti-floating anchor rod body 20, and temporarily bind them with tie wire Fixing and maintenance, after the structural glue is fully cured under natural conditions for 1 day, the tie wire is removed, and then four automatic displacement acquisition meters 19 are respectively erected on the pole wing 26 and the concrete matrix 22 with the movable clamping device 17, and the The automatic displacement acquisition meter 19 and the low-temperature-sensitive miniature fiber grating sensor string 21 are connected to an external acquisition system, and half of the first-level load (0.1 times the estimated limit load) is pre-applied, and the initial reading is recorded, so as to eliminate the damage caused by rapid loading. The test error, then apply the weight of the counterweight 14 required by the long-term load, start the test;

(5) Measurement and reading data, observe the test at different time periods and time points to obtain the deformation of the fiber reinforced anti-floating anchor under long-term constant load, the test loading, unloading and termination loading conditions, and the criteria for determining the anchor failure According to the "Technical Regulations for Building Foundation Pit Support" (JGJ120-2012)).

Claims (4)

1. a kind of long-term anti-pulling capacity indoor test device of fiber bar anti-float anchor rod, it is characterised in that main structure includes rigidity Pedestal, earth anchor screw rod, earth anchor nut, the first column, the second column, floor, first crossbeam, second cross beam, third crossbeam, fixation Axis, first crossbeam connecting rod, second cross beam connecting rod, third crossbeam connecting rod, counterweight, high-strength nut, nut shim, activity clamping dress It sets, is oriented to steel bracket, automatic displacement acquisition meter, the fiber bar anti-float anchor rod body of rod, low-temperature-sensitive mini optical fibre grating sensor string, mixes Solidifying soil matrix body, high-strength bolt, base threaded hole, steel cushion block, the bar wing, third crossbeam fixing axle, first crossbeam connecting rod fixing axle, the Two crossbeam connecting rod fixing axles, third crossbeam connecting rod fixing axle；Rigid base, earth anchor screw rod, ground anchor bolt, the first column, second Column, floor, first crossbeam, second cross beam, third crossbeam, first crossbeam fixing axle, first crossbeam connecting rod, second cross beam connect Bar, third crossbeam connecting rod, clump weight, third crossbeam fixing axle, first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle, Third crossbeam connecting rod fixing axle forms lever load system, and the quadrangle of rigid base is reserved with the hole of diameter 7cm, earth anchor screw rod The hole reserved across rigid base is of coupled connections with earth anchor nut, and rigid base is anchored at by earth anchor screw rod and earth anchor nut On rigid ground, the first column and the second column are welded on rigid base vertically respectively, the column of the first column and the second column Floor is welded at foot；One end of first crossbeam is horizontally fixed on the first column by first crossbeam fixing axle, the other end Lower section is welded with the first crossbeam connecting rod being fixed on second cross beam, and first crossbar connecting rod is perpendicular by first crossbeam connecting rod fixing axle It is directly fixed on the right part of second cross beam upwards, one end of second cross beam connecting rod is solid straight up by second cross beam connecting rod fixing axle It is scheduled on third crossbeam, the other end is welded below second cross beam left part, and one end of third crossbeam connecting rod is connected by third crossbeam Bar fixing axle is fixed on straight down on third crossbeam, and the other end is connect with clump weight；The left end of first crossbeam and second cross beam Right end be inserted vertically into the fiber bar anti-float anchor rod body of rod respectively, high-strength nut and nut shim collectively form fiber bar anti-float anchor rod The drawing anchorage of the body of rod, the fiber bar anti-float anchor rod body of rod are connect with high-strength nut by screw thread couple, and nut shim is mounted on fibre It ties up between the muscle anti-float anchor rod body of rod and high-strength nut, the both ends of rigid base are symmetrically installed with guiding steel bracket, fiber bar anti-floating It is quasi-distributed in anchor rod body to be implanted with low-temperature-sensitive mini optical fibre grating sensor string；The lower end of the fiber bar anti-float anchor rod body of rod is placed in In concrete substrate, be vertically provided with base threaded hole at four angles of concrete substrate, high-strength bolt pass through base threaded hole with The connection of steel cushion block, high-strength bolt, base threaded hole, steel cushion block collectively form the anchor system of concrete substrate, concrete substrate It is fixedly mounted on rigid base by anchor system, movable clamping device, automatic displacement acquisition meter, the bar wing collectively form displacement Test macro, automatic displacement acquisition meter are erected on movable clamping device, and the fixing clamp of movable clamping device one end screws fixation On being oriented to rigid bracket, the bar wing is pasted on the fiber bar anti-float anchor rod body of rod by epoxy resin apart from concrete substrate top surface At 5cm.

2. the long-term anti-pulling capacity indoor test device of fiber bar anti-float anchor rod according to claim 1, it is characterised in that institute Rigid base is stated using the steel rectangle bottom plate of long 2.4m, width 1.2m, thickness 5cm；One end of earth anchor screw rod is long 25cm, width The expansion header structure of 10cm, high 10cm, the other end are the cylindrical structure with screw thread, diameter 6cm；Earth anchor nut use wall thickness for The steel body of casting of 4cm is simultaneously of coupled connections with earth anchor screw flight；First column and the second column are all made of 140mm × 60mm × 8mm The reserved diameter 50mm hole in the capital of channel steel, the first column and the second column, first crossbeam fixing axle, third crossbeam are fixed Axis, first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle and third crossbeam connecting rod fixing axle are by high-strength pin and height Strong nut thread is of coupled connections composition, wherein first crossbeam fixing axle, third crossbeam fixing axle high-strength bolt diameter be 40mm, The high-strength pin diameter of first crossbeam connecting rod fixing axle, second cross beam connecting rod fixing axle and third crossbeam connecting rod fixing axle is 30mm；For floor with a thickness of 0.8cm, shape is right-angled trapezium, a length of 20cm in top, following a length of 30cm, a height of 30cm；First Crossbeam, second cross beam, third crossbeam width be 8cm, with a thickness of 12cm, length is respectively 1.6m, 1.3m, 1.0m；First crossbeam It is 50mm, second cross beam and first crossbeam connecting rod phase with the bore dia that third crossbeam is connected with the first column and the second column respectively The bore dia that hole even, third crossbeam are connected with second cross beam connecting rod and third crossbeam connecting rod respectively is 40mm, first crossbeam Left end and the right end of second cross beam be reserved for the hole that the fiber bar anti-float anchor rod body of rod passes through respectively, aperture is greater than fiber bar The diameter of the anti-float anchor rod body of rod；First crossbeam connecting rod, second cross beam connecting rod, third crossbeam connecting rod size be long 30cm, width 6cm, thickness 2cm.

3. the long-term anti-pulling capacity indoor test device of fiber bar anti-float anchor rod according to claim 1, it is characterised in that institute It states the rigid bracket of guiding to be welded by plain bar, a steel ring is welded on the guide rod welded thereon, steel ring diameter is greater than fibre Tie up muscle anti-float anchor rod shank diameter；High-strength nut is the hex nut of wall thickness 3cm, and nut shim is circular ring shape steel disc, internal diameter Greater than the diameter of the fiber bar anti-float anchor rod body of rod, outer diameter is greater than the outer diameter of high-strength nut；The bar wing uses 5cm × 5cm × 0.5cm The semicircle steel pipe of angle bar and internal diameter 2cm, wall thickness 0.3cm are welded, and the fiber bar anti-float anchor rod body of rod is glass fiber reinforced polyester Object full thread solid rod-like structure is closed, concrete substrate uses the cast-in-situ steel reinforced concrete cuboid of high 1m, long 60cm, width 60cm Structure, high-strength bolt are the threaded steel rod piece of lower end system, and the hole depth of a diameter of 5cm, a length of 2.2m, base threaded hole are 3cm, steel cushion block are the rectangular bloom of 8cm × 8cm × 4cm, and center is formed with the circular hole of aperture 6cm.

4. the long-term anti-pulling capacity indoor test device of fiber bar anti-float anchor rod according to claim 1, it is characterised in that institute State movable clamping device by fixing clamp, magnetic attraction pedestal, first direction adjuster, the first steel chain bar, second direction adjuster, Second steel chain bar, guide clip holder composition, fixing clamp are fixed on the rigid bracket of guiding in a manner of screwing clamping, magnetic attraction bottom Seat magnetic-adsorption is on the perpendicular of fixing clamp, one end of first direction adjuster and magnetic attraction tube chamber welds with base, the other end It is fixedly connected with the first steel chain bar, one end of second direction adjuster is connected with the first steel chain bar, the other end and the second steel chain bar It is connected, is fixed between the first steel chain bar and the second steel chain bar by fastening bolt, the length of the first steel chain bar and the second steel chain bar With angle can flexible modulation, guide clip holder one end connect in a manner of screw thread couple with one end of the second steel chain bar, the other end It is fixedly installed with automatic displacement acquisition meter by fastening bolt, guide clip holder is mounted on the second steel chain bar and automatic displacement acquisition Between meter, the upper surface of guide clip holder is formed with spirit level.