CN108844827B - Multifunctional geogrid drawing test device based on actual working conditions - Google Patents
Multifunctional geogrid drawing test device based on actual working conditions Download PDFInfo
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- CN108844827B CN108844827B CN201810545488.4A CN201810545488A CN108844827B CN 108844827 B CN108844827 B CN 108844827B CN 201810545488 A CN201810545488 A CN 201810545488A CN 108844827 B CN108844827 B CN 108844827B
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention provides a multifunctional geogrid drawing test device based on actual working conditions, which is characterized by comprising the following components: a bearing plate; the sample case, fix on the bolster board, contain: the box body is provided with a plurality of rows of sliding chutes which are arranged on the front surface and the two side surfaces from top to bottom; a vertical loading section comprising: the device comprises an air cushion layer placed on a filler, a loading plate arranged on the air cushion layer, and a servo hydraulic loader for applying vertical force to the loading plate; a transverse drawing section comprising: the device comprises a clamp for clamping the edge part of the front side of the geogrid, a pull rod connected with the clamp, a reaction frame and a drawing driver arranged on the reaction frame and connected with the pull rod; and a measuring section including: the front end pulley is positioned on the outer surface of the side chute, the rear end of the pulley is correspondingly connected with a row of nodes on the side edge of the geogrid, scale marks representing the positions of the pulleys, a tension sensor and a displacement sensor which are arranged on the transverse drawing part, and two cameras respectively facing to two sides of the box body.
Description
Technical Field
The invention belongs to the field of drawing test devices, and particularly relates to a multifunctional geogrid drawing test device based on actual working conditions.
Background
The geogrid is a geosynthetic material, is of a net structure, has high tensile strength and low elongation, has large width and thickness at nodes, and has a lateral resistance effect on soil particles. The grid ribs are thick, the strength is high, mesh fracture is not easy to occur, the impact resistance is strong, and the sharp stone puncture resistance can be greatly improved; the mesh has good stability, has stronger nesting effect and arching effect on coarse-grained soil, increases the shearing resistance of the geogrid and the filler, can form very effective occlusion and nesting effect with soil particles to form a string bag effect, has more obvious integral reinforcement effect, and is widely applied to the projects of roadbed treatment of highways and railways, side slope retaining walls, high slopes and the like.
Geogrid is a novel geosynthetic material, and a series of performance tests need to be carried out on the geogrid in order to meet the use requirement of the geogrid in civil engineering. Performance testing of geogrids involves measuring the physical-mechanical properties of the material itself and providing reliable material-soil interaction characteristics.
The drawing experiment equipment disclosed at present can only carry out drawing experiment on one layer of geogrid once, and the actual engineering has the conditions of two layers or even multiple layers of geogrids, such as a reinforced roadbed, a reinforced retaining wall and the like. The equipment size of the drawing test is relatively small, and due to the limitation of the indoor model size effect, the research on the interaction of the earth-reinforcement interface is inevitably influenced by the boundary effect. And the existing drawing test equipment is easy to cause stress concentration due to uneven distribution of tensile force, so that the material is damaged at the clamp end, and the accuracy of the test result is greatly influenced. In addition, the loading mode of the existing equipment mostly takes single-side loading of an oil jack and a water tank as main parts, and the two loading modes often have the situations of uneven soil body stress and difficult loading. The influence of the boundary effect on the test reliability when the actual working condition is simulated is not fully considered by the conventional equipment.
Disclosure of Invention
The invention is made to solve the above problems, and an object of the invention is to provide a multifunctional geogrid drawing test device based on actual conditions, which can test two or more layers of geogrids simultaneously, can also test various types of geogrids in drawing under dynamic and static load conditions, and can effectively reduce the influence of size effect and boundary conditions.
In order to achieve the purpose, the invention adopts the following scheme:
the invention provides a multifunctional geogrid drawing test device based on actual working conditions, which is characterized by comprising the following components: a bearing plate; the sample case, fix on the bolster board, contain: the box body is provided with an opening at the top, is hollow and cuboid in the interior and is used for placing filler and at least one layer of geogrid embedded in the filler, a plurality of rows of sliding chutes corresponding to the plurality of layers of geogrids are arranged on the front surface and the two side surfaces from top to bottom, three sliding chutes positioned on the same row on the three surfaces correspond to three side parts of the same geogrid, the sliding chutes positioned on the front surface are used as front sliding chutes, and the sliding chutes positioned on the two side surfaces are used as side sliding chutes; a vertical loading section comprising: the device comprises an air cushion layer, a loading plate and a servo hydraulic loader, wherein the air cushion layer is placed on a filler and can move up and down along the inner wall of a box body; a transverse drawing section comprising: the device comprises a clamp, a pull rod, a reaction frame and a drawing driver, wherein the clamp is used for clamping and fixing the front side edge part of the geogrid corresponding to a front sliding groove, the pull rod is connected with the clamp and transversely extends, the reaction frame is fixed on a bearing platform plate, and the drawing driver is arranged on the reaction frame and connected with the rear end of the pull rod; and a measuring section including: the device comprises a plurality of pulley components, scale marks, a tension sensor and a displacement sensor, wherein the pulley components are arranged on the outer surface of a side sliding groove, a connecting rod at the front end extends into the side sliding groove and is correspondingly connected with a row of nodes on the side edge part of the geogrid, the scale marks are at least arranged on two side surfaces of a box body and are positioned near the sliding groove and represent the positions of the pulleys, the tension sensor and the displacement sensor are arranged on a transverse drawing part, and the two cameras are respectively arranged towards the two side surfaces of the box body and record the position change process.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: wherein, the inside size of box is: the length is 800mm, wide 600mm, high 900mm, and the wall thickness of box is 15mm, and the horizontal length of every positive spout is 400mm, and vertical width is 8mm, forms the draw mouth, and the horizontal length of every side spout is 600mm, and the width is 8mm, and the interval of adjacent each row of spout is 100 mm.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the four side surfaces of the loading plate are provided with lugs, four inner walls of the box body are provided with embedded grooves which are matched with the lugs and extend from top to bottom, and the top load can be prevented from being unevenly distributed due to the inclination of the loading top plate.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the clamp includes: two splint, fastener and connecting piece, all be equipped with a plurality of connecting holes along length direction on every splint, geogrid is cliied from both sides about two splint are respectively, and the fastener inserts in the connecting hole that corresponds on two splint, is in the same place two splint and geogrid fastening, and the connecting piece links to each other two splint and pull rod.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the connecting holes arranged on the clamping plate are threaded holes, and the distance between every two adjacent connecting holes is 2 cm.
The invention relates to a multifunctional geogrid drawing test device based on actual working conditions, which can also comprise: and the plurality of smooth adhesive films are fixedly connected with the geogrid and wrap the front side part and the two side parts of the geogrid respectively.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the pulley member includes: assembly pulley and the connecting rod of taking the hook, the assembly pulley contains: one end of the connecting rod is connected with the rotating shaft of the pulley block, and the other end of the connecting rod is bent to form a hook part and is correspondingly connected with nodes on the side edge part of the geogrid.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the servo hydraulic loader is a static and dynamic hydraulic servo vibrator, and the drawing driver is a center-penetrating jack.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the tension sensor is arranged between the pull rod and the connecting piece, and the displacement sensor is a displacement dial indicator and is connected with the drawing driver.
The multifunctional geogrid drawing test device based on the actual working condition, which is related by the invention, can also have the following characteristics: the transverse drawing part comprises at least two clamps, at least two drawing drivers and at least two pull rods, all the drawing drivers are arranged on the reaction frame from bottom to top, each row of the drawing drivers corresponds to one row of the front sliding grooves, and the measuring part comprises more than two tension sensors and two displacement sensors.
Action and Effect of the invention
The multifunctional geogrid drawing test device based on the actual working conditions can be used for simultaneously carrying out drawing test tests on single-layer or multi-layer geogrids; the servo hydraulic loader applies force to the loading plate, and then the air cushion layer buffers and transmits the load, so that the load can be uniformly distributed on the top of the filler; different front sliding grooves are selected as drawing openings, so that different filler thicknesses are correspondingly selected, and the filler thickness can be conveniently adjusted according to actual working conditions; the position change conditions of the pulley components are recorded by the cameras facing the two side faces of the box body, so that the displacement change conditions of each node in a row of nodes in the side of the geogrid can be obtained, the relation between the relative displacement of the reinforced soil and the deformation of the geogrid can be further obtained according to data collected by the tension sensor and the displacement sensor, and reference is provided for projects needing reinforcement.
In addition, smooth glued membrane is connected to three limit portions of geogrid, can effectively solve the actual in-process filler and pile up at the wall of drawing, especially pile up in drawing the direction, avoid the filler to block the problem that causes stress concentration.
Drawings
Fig. 1 is a schematic structural diagram of a multifunctional geogrid drawing test device based on actual working conditions according to an embodiment of the invention;
fig. 2 is a side view of a multifunctional geogrid drawing test device based on actual working conditions according to an embodiment of the invention;
fig. 3 is a top view of a multifunctional geogrid drawing test device based on actual working conditions according to an embodiment of the invention;
fig. 4 is a perspective view of a multifunctional geogrid drawing test device based on practical conditions according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing the corresponding relationship between the box body (a) and the loading plate (b) according to the embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a jig according to an embodiment of the present invention;
fig. 7 is a first schematic view of the installation relationship of the geogrid, the smooth adhesive film and the clamp according to the embodiment of the invention;
fig. 8 is a second schematic view of the installation relationship of the geogrid, the smooth adhesive film and the clamp according to the embodiment of the invention;
fig. 9 is a schematic structural view of a pulley member according to an embodiment of the present invention.
Detailed Description
The multifunctional geogrid drawing test device based on actual working conditions according to the invention is explained in detail with reference to the attached drawings.
< example >
As shown in fig. 1 to 4 and 7, the multifunctional geogrid drawing test device 10 based on actual working conditions comprises a bearing plate 20, a sample box 30, a vertical loading part 40, a transverse drawing part 50, a plurality of smooth adhesive films 60 and a measuring part 70.
The bearing plate 20 is rectangular, and the upper and lower surfaces are parallel to the horizontal plane, so as to play a bearing role.
The sample chamber 30 is fixedly mounted on the platform 20 and includes a chamber body 31 and a plurality of rows of chutes 32.
The box 31 is open at the top, hollow and cuboid inside, and is used for placing filler and at least one geogrid G to be tested embedded in the filler. In this embodiment, the box 31 is connected to the bearing plate 20 through an angle steel, one side of the angle steel is welded to the side wall of the box 31, and the other side of the angle steel is provided with a bolt hole and connected to the bearing plate 20 through a matching bolt; the steel plate on the bottom surface of the box body 31 is connected with the steel plates on the periphery in a welding mode; the dimensions inside the box 31 are: the length is 800mm, the width is 600mm, and the height is 900 mm; the wall thickness of the box 31 is 15 mm. In addition, the entire box 31 is coated with lubricating oil to keep the inner wall lubricated. When placing the sample, firstly placing a filler (such as ballast) with a certain height in the box body 31, then placing the geogrid G to be tested on the filler, and finally adding the filler with a certain height on the geogrid G; that is, the filler is disposed on both upper and lower layers of the geogrid G.
The sliding grooves 32 are provided on the front surface and both side surfaces of the box body 31 and penetrate through the side walls of the box body 31, and in the present embodiment, as shown in fig. 1 and 2, a total of fifteen sliding grooves 32 are provided, and five (i.e., five rows) of the sliding grooves 32 are arranged in parallel from top to bottom on each surface. The three runners 32 in the same row on the three faces are in the same plane and thus can correspond to three edges of the same geogrid G. On each surface, the distance between the upper and lower adjacent rows of chutes 32 is 100mm, and the distance between the chute 32 located in the lowermost row and the bottom plate of the box 31 is 200 mm. The slide groove 32 positioned on the front side is used as a front slide groove 32a, and the slide grooves 32 positioned on the two side surfaces are used as side slide grooves 32 b; each front surface chute 32a has a transverse length of 400mm and a vertical width (a distance between the upper and lower surfaces of the chute) of 8mm, and forms a drawing opening 32a perpendicular to a drawing direction indicated by an arrow F in fig. 2; each side sliding groove 32b has a transverse length of 600mm and a width of 8mm, and is parallel to the drawing direction F. Each of the slide grooves 32a and 32b is coated with lubricating oil.
As shown in fig. 4 and 5, the vertical loading portion 40 includes an air cushion layer 41, a loading plate 42, and a servo hydraulic loader 43.
The air cushion layer 41 is placed on the uppermost filler, is in contact with the box 31 at the periphery, and can move up and down along the inner wall of the box 31. In this embodiment, a rubber hoisting air cushion is used as the air cushion layer 41, the load is 1 ton, the hoisting height is 80mm, the length is about 800mm, and the width is about 600mm, so that the air cushion can be inflated and filled with water.
The loading plate 42 is disposed above the air cushion layer 41 and is also movable up and down along the inner wall of the cabinet 31. As shown in fig. 5, four side surfaces of the loading plate 42 are provided with protrusions 42a, and four inner walls of the box 31 are provided with fitting grooves which are matched with the protrusions 42a and extend from top to bottom. The convex block 42a is matched with the embedding groove 31a, so that the loading plate 42 can be better attached to the inner wall of the box body 31 to be buckled and stably moved, and the phenomenon that the top loading plate 42 is inclined due to expansion of the filler in the box body 31 in the drawing process is avoided.
The servo hydraulic loader 43 is mounted directly above the top opening of the sample box 30 by a mounting bracket 43a, and applies a vertical loading force to the loading plate 42. In this embodiment, the adopted servo hydraulic loader 43 is a static and dynamic hydraulic servo vibrator, the static and dynamic hydraulic servo vibrator vertically and downwardly applies dynamic and static loads to the loading plate 42, and the air cushion layer 41 buffers and conducts the loads, so that the loads can be uniformly distributed on the top of the filler.
As shown in FIGS. 1-2, 4 and 6, the transverse drawing section 50 includes two clamps 51, two tie rods 52, a reaction frame 53, and two drawing actuators 54.
The jig 51 is used to clamp and fix the front side edge (i.e., the edge corresponding to the front chute 32 a) of the geogrid G. The clamp 51 includes two clamping plates 511, a fastener (not shown), and a connecting member 512.
Each of the clamping plates 511 is uniformly provided with a plurality of connecting holes 511a along the length direction, and the two clamping plates 511 respectively clamp the geogrid G from the upper side and the lower side. In this embodiment, the connection holes 511a provided on the two clamp plates 511 are both threaded holes, and the distance between the adjacent connection holes 511a is 2 cm. Because the plurality of connecting holes 511a are arranged, fasteners can be inserted into different combinations according to the aperture of the geogrid G to fix the geogrid G, for example, the geogrid G with the aperture of 35mm is fixed by the fasteners every two connecting holes 511 a; geogrid G with the aperture of 65mm is fixed by fasteners every third connecting piece 512.
The fastening member is fitted into the coupling hole 511a, and can be inserted into the corresponding coupling hole 511a of the upper and lower clamping plates 511 and G to fasten the upper and lower clamping plates 511 and G together. In this embodiment, an M3 nut and nut are used as the fasteners. After the geogrid G is clamped by the two clamping plates 511, the geogrid G can be fixed by nuts and nuts according to the selected connecting holes 511 a.
Each connecting piece 512 is of a frame-shaped structure, the front end of each connecting piece is provided with an upper mounting column and a lower mounting column which are used for fixedly mounting two clamping plates 511, and the rear end of each connecting piece is connected with the pull rod 52.
Each tie rod 52 is associated with one clamp 51 and extends along the drawing direction F.
The reaction frame 53 is fixedly mounted on the platform plate 20 by bolts, and in this embodiment, five mounting positions are provided on the reaction frame 53 in total, and correspond to five rows of front sliding grooves 32a (five drawing openings) one by one.
The two drawing drivers 54 are respectively detachably mounted on different mounting positions of the reaction frame 53 and connected with the rear end of the pull rod 52, the mounting positions of the two drawing drivers 54 can be adjusted according to different positions of the geogrid G, so that the drawing drivers 54 can draw the geogrid G in different drawing ports, and the two drawing drivers 54 can simultaneously perform drawing tests on two layers of geogrids G. The pull actuator 54 in this embodiment is a through jack.
As shown in fig. 7, a plurality of smooth adhesive films 60 (shown as slanted stripes) are fixedly attached to the geogrid G and wrap the front side edge and the two side edges of the geogrid G, respectively. The smooth adhesive film 60 can prevent the filler located near the inner wall of the box 31 from being stuck in the geogrid G to cause a boundary effect; on the other hand and effectively reduces the stress concentration effect in the area between the jig 51 and the geogrid G. In the embodiment, the adopted smooth adhesive film 60 is a rubber film with the thickness of 2-5 mm, and a layer of butter can be coated on the smooth adhesive film to reduce the friction force; the upper layer and the lower layer of the smooth adhesive film 60 wrap the front side edge part and the two side edge parts of the geogrid G and are connected with the geogrid G node in the area; as shown in fig. 8, two clamping plates 511 clamp the smooth adhesive film 60, thereby indirectly clamping and fixing the geogrid G.
As shown in fig. 1 to 2 and 9, the measuring part 70 includes a plurality of pulley members 71, ten scale marks (not shown), two tension sensors 72, two displacement sensors 73, and two camcorders (not shown).
Each pulley member 71 comprises a pulley block 711 and a hooked link 712. The pulley block 711 includes a rotation shaft 711a and two pulleys 711a coaxially connected by the rotation shaft 711 a. The pulley 711a is located outside the side slide groove 32b and can slide back and forth along the outer surface thereof. One end of the link 712 is connected to the rotation shaft 711 a; the other end extends into the side sliding groove 32b, and the front end is bent to form a hook part which is correspondingly connected with nodes on the side edge part of the geogrid, and the nodes are restrained by the hook part. A plurality of pulley members 71 are respectively connected to a row of nodes on the side edges of the geogrid so that the displacement variation of each node can be simultaneously reflected.
Ten scale marks are provided on both sides of the case 31, respectively, and at upper regions of the ten side sliding grooves 32b, for indicating the positions of the pulleys 711 a. During the drawing process, the displacement of each node of the geogrid can be obtained by observing and recording the position of each pulley 711a outside the box body 31.
The tension sensor 72 and the displacement sensor 73 are mounted on the lateral drawing section 50. Specifically, the tension sensor 72 is installed between the pull rod 52 and the connecting member 512, and collects data of the drawing force; the displacement sensor 73 is a displacement dial indicator, one end of which is mounted above the bearing plate 20 through a mounting bracket 73a, and the other end of which is connected with the drawing driver 54 to collect displacement data.
The two cameras are disposed near the casing 31 and face the two sides of the casing 31, respectively, to record the position change process of the pulleys 711 a.
As shown in fig. 1 to 9, based on above structure, adopt the utility model provides a multifunctional geogrid based on operating condition draws test device 10 and draws experimental concrete operation process does:
and under the static load condition, selecting ballast as a filler, and simultaneously carrying out drawing test on the two layers of geogrids G. The first and third two drawing ports 32a are selected in order from the bottom up. The two drawing ports 32a divide the box 31 into three parts, and the three parts are respectively filled with filler, and the height of the filler is 200 mm.
Firstly, a layer of ballast with the thickness of 200mm is filled in the box body 31.
Second, the smooth adhesive film 60, the jig 51 and the geogrid G are connected as shown in fig. 1 and 8 while passing through the first drawing opening 32a, and then the belt rod pulley 711a (12) passes through the chute 32(11) to connect the smooth adhesive film 60.
And thirdly, filling ballast with the thickness of 200mm, and repeating the step two to finish paving the second layer of geogrid G.
Fourthly, filling ballast with the thickness of 200mm, and sequentially placing the air cushion layer 41 and the loading plate 42 from bottom to top.
And fifthly, the clamp 51, the tension sensor 72, the pull rod 52, the drawing driver 54, the reaction frame 53 and the displacement sensor 73 are sequentially connected.
And sixthly, starting the servo hydraulic loader 43, adjusting to a set value, applying vertical static load, opening the video recorder after the numerical value is stable, and starting the drawing driver 54.
After the test is finished, the value of the horizontal load changing along with the time is obtained according to the position change condition of each pulley 711a recorded by the video camera, the tension sensor 72, the displacement sensor 73 and the collected data. And then the relation between the relative displacement of the reinforced soil and the deformation of the geogrid can be obtained through calculation, so that reference is provided for the project needing reinforcement.
The above embodiments are merely illustrative of the technical solutions of the present invention. The multifunctional geogrid drawing test device based on actual working conditions is not limited to the structures described in the above embodiments, but is subject to the scope defined by the claims. Any modification, or addition, or equivalent replacement by a person skilled in the art on the basis of this embodiment is within the scope of the invention as claimed.
In the above embodiment, the transverse drawing part comprises two clamps, two drawing drivers and two pull rods, so that the two layers of geogrids can be simultaneously subjected to drawing tests; in the invention, in order to simultaneously perform more geogrid drawing tests, the transverse drawing part can comprise more than two clamps, drawing drivers and pull rods, and correspondingly, the measuring part comprises the same number of tension sensors and displacement sensors.
Claims (7)
1. The utility model provides a test device is drawn to multi-functional geogrid based on operating condition which characterized in that includes:
a bearing plate;
a sample case fixed to the deck plate, comprising: the box body is provided with an opening at the top, is hollow and cuboid in the interior and is used for placing filler and at least one layer of geogrid embedded in the filler, a plurality of rows of sliding chutes corresponding to the plurality of layers of geogrids are arranged on the front surface and the two side surfaces from top to bottom, three sliding chutes positioned on the same row on the three surfaces correspond to three side parts of the same geogrid, the sliding chutes positioned on the front surface are used as front sliding chutes, and the sliding chutes positioned on the two side surfaces are used as side sliding chutes;
a vertical loading section comprising: the loading plate is arranged above the top opening of the sample box and is aligned with the loading plate to apply vertical loading force;
a transverse drawing section comprising: the device comprises a clamp, a pull rod, a reaction frame and a drawing driver, wherein the clamp is used for clamping and fixing the front side edge part of the geogrid corresponding to the front sliding chute, the pull rod is connected with the clamp and transversely extends, the reaction frame is fixed on the bearing plate, and the drawing driver is installed on the reaction frame and connected with the rear end of the pull rod;
a measurement unit including: the front end pulley is positioned on the outer surface of the side sliding groove, the rear end connecting rod extends into the side sliding groove and is correspondingly connected with a row of nodes on the side edge part of the geogrid, scale marks which are at least arranged on two side surfaces of the box body and are positioned near the sliding groove and represent the positions of the pulleys, a tension sensor and a displacement sensor which are arranged on the transverse drawing part, and two cameras which are respectively towards the two side surfaces of the box body and record the position change process of the pulleys; and
a plurality of smooth adhesive films fixedly connected with the geogrid and respectively wrapping the front side edge part and the two side edge parts of the geogrid,
wherein the pulley member includes: a pulley block and the connecting rod with a hook,
the pulley block comprises: a rotating shaft, and two pulleys coaxially connected through the rotating shaft,
one end of the connecting rod is connected with the rotating shaft of the pulley block, the other end of the connecting rod is bent to form a hook part and is correspondingly connected with a node on the side edge part of the geogrid,
a plurality of the pulley members are respectively connected to a row of nodes on the lateral edges of the geogrid so as to synchronously reflect the displacement change of each node,
the transverse drawing part comprises at least two clamps, at least two drawing drivers and at least two pull rods,
all the drawing drivers are arranged on the reaction frame from bottom to top, each row of the drawing drivers corresponds to one row of the front sliding grooves,
the measuring part comprises more than two tension sensors and more than two displacement sensors.
2. The multifunctional geogrid drawing test device based on actual working conditions according to claim 1, characterized in that:
wherein, the inside size of box is: 800mm in length, 600mm in width and 900mm in height,
the wall thickness of the box body is 15mm,
the transverse length of each front sliding chute is 400mm, the vertical width of each front sliding chute is 8mm, a drawing opening is formed,
the transverse length of each side sliding groove is 600mm, the width of each side sliding groove is 8mm,
the distance between every two adjacent rows of sliding grooves is 100 mm.
3. The multifunctional geogrid drawing test device based on actual working conditions according to claim 1, characterized in that:
the four side surfaces of the loading plate are provided with lugs, and the four inner walls of the box body are provided with embedded grooves which are matched with the lugs and extend from top to bottom.
4. The multifunctional geogrid drawing test device based on actual working conditions according to claim 1, characterized in that:
wherein the jig comprises: two clamping plates, a fastener and a connecting piece,
a plurality of connecting holes are arranged on each clamping plate along the length direction, the two clamping plates clamp the geogrid from the upper side and the lower side respectively,
the fasteners are inserted into the corresponding connecting holes on the two clamping plates to fasten the two clamping plates and the geogrid together,
the connecting piece connects the two clamping plates with the pull rod.
5. The multifunctional geogrid drawing test device based on actual working conditions according to claim 4, further comprising:
the connecting holes formed in the clamping plate are threaded holes, and the distance between every two adjacent connecting holes is 2 cm.
6. The multifunctional geogrid drawing test device based on actual working conditions according to claim 1, characterized in that:
the servo hydraulic loader is a static hydraulic servo vibrator and a dynamic hydraulic servo vibrator, and the drawing driver is a center-penetrating jack.
7. The multifunctional geogrid drawing test device based on actual working conditions according to claim 1, characterized in that:
wherein the tension sensor is arranged between the pull rod and the clamp,
the displacement sensor is a displacement dial indicator and is connected with the drawing driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810545488.4A CN108844827B (en) | 2018-05-25 | 2018-05-25 | Multifunctional geogrid drawing test device based on actual working conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810545488.4A CN108844827B (en) | 2018-05-25 | 2018-05-25 | Multifunctional geogrid drawing test device based on actual working conditions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108844827A CN108844827A (en) | 2018-11-20 |
| CN108844827B true CN108844827B (en) | 2020-03-10 |
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| CN102230866A (en) * | 2011-06-08 | 2011-11-02 | 深圳市华星光电技术有限公司 | Local stress capacity test platform and device |
| CN202928938U (en) * | 2012-12-04 | 2013-05-08 | 中建五局土木工程有限公司 | Pull-out test device for detecting friction characteristics of building reinforcement interface |
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