CN103940735B - The interface friction performance pilot system of a kind of anchor or oil and pile and test method - Google Patents
The interface friction performance pilot system of a kind of anchor or oil and pile and test method Download PDFInfo
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- CN103940735B CN103940735B CN201410176877.6A CN201410176877A CN103940735B CN 103940735 B CN103940735 B CN 103940735B CN 201410176877 A CN201410176877 A CN 201410176877A CN 103940735 B CN103940735 B CN 103940735B
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Abstract
The invention discloses interface friction performance shop experiment system and the test method of a kind of anchor or oil and pile, comprise sample, sample guiding fixing device, propulsion system, counterforce device and measure and control device.This pilot system and test method, achieve pilot system to be separated with sample production, can be used for testing the interface friction performance of anchor pole or pile foundation and soil, the relation curve of the relative displacement of interface frictional resistance stress and anchor-soil or Pile Soil under different operating mode can be obtained more exactly.Because specimen size is little, cost of manufacture is low, shop experiment can be repeated in large quantity, and the impact of the factors vary such as water content of soil, load mode on frictional resistance interface performance can be considered, accurately can grasp the friction performance at interface all sidedly, avoid only carrying out one to several anchor pole or foundation pile test for fear of the consideration of economic factors in site test and indoor model test, what obtain also can only be comparatively average surface friction performance within the scope of thick soil stratum in the past.
Description
Technical field
The present invention relates to the anchor pole or pile foundation test technology that often use in the engineerings such as room is built, traffic, water power, municipal administration, mine, particularly relate to interface friction performance shop experiment system and the test method of a kind of anchor or oil and pile.
Background technology
Anchor pole and pile foundation technology are widely used in the engineering fields such as room is built, traffic, water power, municipal administration, mine.The time that both are applied to engineering practice is different, timber before thousands of year namely by the mankind for the production of in the middle of life, and the application of the anchor pole only history of over one hundred year.But both mechanism of action exists a lot of similarity, first, both profiles are all generally the cylindric bodies of rod; Secondly, both forced contact faces are generally the surface of contact of gel (such as concrete, mortar etc.) and Rock And Soil; Finally, both stressed all only bears responsive to axial force mostly.For the load transfer mechanism of anchor pole and pile foundation, especially the stress deformation characteristic at gel and Rock And Soil interface, substantially rely in engineering and site test is carried out to Engineering anchor rod and pile foundation, there is no shop experiment instrument that is simple and easy to do and that conform to actual condition and test method at present both at home and abroad.
There is following shortcoming in on-the-spot Engineering anchor rod drawing and pile foundation compression test: first, costly, an anchor pole cost may be that thousands of unit is to tens thousand of unit, and the cost of a pile may be that tens thousand of unit is to hundreds thousand of unit, in addition site test also needs to drop into extra manpower and materials, therefore, a small amount of anchor pole and pile foundation often can only be selected to test; The second, the construction of on-the-spot anchor pole and pile foundation, maintenance and test need the time longer, and this often had a huge impact the duration; 3rd, site test time point generally will carry out after maintenance, different operating mode (infiltrate as heavy showers Rock And Soil, the evaporation of Rock And Soil moisture, WATER LEVEL CHANGES, Different Loading Method etc.) cannot be simulated, corresponding various different operating mode, the interface friction performance of anchor or oil and pile is inevitable different.
Although the interface friction performance of anchor or oil and pile is tested by indoor model test by existing Some Universities and scientific research institutions, is all carry out model test in geosyncline or model casing, yet there are no a kind of easier test apparatus of exploitation and test.The subject matter that this kind of model test exists comprises: 1. because moulded dimension is relatively large, same exist repeatable poor, different operating mode can not be carried out more all sidedly or composite condition casts anchor or the interface friction performance of oil and pile is tested defect, 2. lack sealing water-keeping device, be difficult to the constant of water content of soil in warranty test process, when testing different moisture content if be used for the long-term friction performance at anchor-Soil Interface or Pile Soil interface or creep properties, test findings is undistorted unavoidably, 3. there is certain defect in test design in principle, due to we analyze the load transfer law of anchor pole or stake in theory time, what use is the friction performance (shear stress at such as interface and displacement or relation between shear stress and shearing strain) at micro-section of upper anchor-Soil Interface or Pile Soil interface, when therefore testing this interface friction performance, in sample, cementing section of anchor-soil or the cementing segment length of Pile Soil should be more short better, and in existing model test apparatus and method, anchor-soil or the cementing segment length of Pile Soil all very large, what obtain like this is average surface friction performance in this long section naturally, truly can not reflect anchor-soil or Pile Soil interface friction performance.
In addition, also have both at home and abroad and estimate the interface friction performance of anchor or oil and pile by soil and the direct shear test of works, but because the actual condition of this method and anchor or stake is not inconsistent, can not simulate the true loading process of anchor-soil or Pile Soil interface, acquired results truly can not reflect the actual interface friction performance of anchor or oil and pile.
Summary of the invention
The object of the invention is to the deficiency overcoming above-mentioned technology, propose a kind of easy, easy, conform to actual condition, pilot system and the separable anchor-soil of test sample or Pile Soil interface friction performance shop experiment system and method.
For solving above technical matters, the technical solution adopted in the present invention is: the interface friction performance pilot system of a kind of anchor or oil and pile, comprises sample, also comprise:
Sample guiding fixing device, described sample guiding fixing device comprises base, cover plate, web member and the guide cylinder be arranged on cover plate and gland bonnet, described sample is fixed diametrically by base and cover plate, and is limited in the axial direction by sample by the web member be arranged between base and cover plate;
Load transfer device, described load transfer device comprises transmission rod, the upper adapter be connected with described transmission rod threaded upper ends, the upper cap nut be connected with described upper adapter threaded upper ends, the upper stud bolt be flexibly connected with described upper cap nut, the lower adapter be connected with sample core bar threaded upper ends, the lower nut be connected with described lower adapter threaded upper ends, and the lower stud bolt that lower end is flexibly connected with described lower nut, upper end is threaded with described transmission rod; Described transmission rod is inserted in described guide cylinder and gland bonnet center pit;
Propulsion system, described propulsion system comprise actuating unit, elevating bracket and the lifting screw for connecting described elevating bracket and base, for the interface friction performance of anchor with soil test and provided lower pulling force, or provide upward pressure for the interface friction performance of oil and pile is tested;
Counterforce device, described counterforce device comprises counter-force post, be arranged at reaction beam between counter-force post, be arranged at counter-force bolt bottom described reaction beam, and for the dormant bolt of fixing described counter-force bolt and counter, described counterforce device test and is provided counter-force needed for drawing for the interface friction performance of anchor with soil, or provides counter-force needed for the pressure of top for the interface friction performance test of oil and pile; And
Measure and control device, described measure and control device comprises control/readout instrument, is arranged at the displacement transducer on described cover plate, and the force snesor that lower end is threaded with described upper stud bolt, upper end is connected with counter-force bolt thread.
Further, described base and cover plate surrounding respectively correspondence are provided with annular flange, for being limited diametrically by sample.
Further, described sample and between base and cover plate, and be respectively arranged with O RunddichtringO between described cover plate top and described guide cylinder bottom surface;
Be provided with sealing ring and O-ring seal in the annulus formed between described guide cylinder top and described transmission rod, successively compress described sealing ring and O-ring seal by rotating described gland bonnet, thus realize the sealing of sample.
Further, described base is provided with the cavity that can hold described sample core bar outshot; Described cavity is communicated with ambient atmosphere by a vent valve.
Further, described upper stud bolt and lower stud bolt stub end shape are spherical or one in elliposoidal; Described upper cap nut and lower nut are respectively equipped with the cavity that can hold described upper stud bolt and lower stud bolt stub end, and described upper cap nut and lower nut can be freely movable in described cavity.
Further, described web member is bolt pair.
Further, described reaction beam is individually fixed on counter-force post by a plurality of hexagonal nuts being arranged on the described upper and lower two ends of counter-force post.
Utilize above-mentioned pilot system to test a method for anchor-Soil Interface friction performance, comprise the steps:
(1) between described propulsion system and counterforce device, successively described sample, sample guiding fixing device, load transfer device and test unit are installed;
(2) start actuating unit and control described elevating bracket, described lifting screw, base, bolt pair, cover plate and sample body is driven to move down successively, and producing a lower pulling force in sample body interior, its lower pulling force then reaches described counterforce device by described sample core bar, lower adapter, lower nut, lower stud bolt, transmission rod, upper adapter, upper cap nut, upper stud bolt and force snesor successively;
(3) control/readout instrument by being connected with described force snesor and displacement transducer gathers stress and displacement data, until drop-down displacement is not less than 5 times of the corresponding displacement of lower pulling force peak value, and termination test.
Utilize a method for above-mentioned pilot system test pile-Soil Interface friction performance, comprise the steps:
(1) between described propulsion system and counterforce device, successively described sample, sample guiding fixing device, load transfer device and test unit are installed;
(2) start actuating unit and control described elevating bracket, drive successively on described lifting screw, base, bolt pair, cover plate and sample body and move, and producing a lifting force in described sample body interior, its lifting force then reaches described counterforce device by described sample core bar, lower adapter, lower stud bolt, transmission rod, upper adapter, upper stud bolt and force snesor successively;
(3) control/readout instrument by being connected with described force snesor and displacement transducer gathers stress and displacement data, until upper pushing moves 5 times that are not less than the corresponding displacement of lifting force peak value, and termination test.
The beneficial effect that the technical solution adopted in the present invention has is:
This pilot system and test method, achieve pilot system to be separated with sample production, can be used for testing the interface friction performance of anchor pole or pile foundation and soil, the relation curve of the relative displacement of interface frictional resistance stress and anchor-soil or Pile Soil under different operating mode (such as different moisture content, different drying and watering cycle, Different Loading Method etc.) can be obtained more exactly.Because specimen size is little, cost of manufacture is low, shop experiment can be repeated in large quantity, and the impact of the factors vary such as water content of soil, load mode on frictional resistance interface performance can be considered, accurately can grasp the friction performance at interface all sidedly, avoid only carrying out one to several anchor pole or foundation pile test for fear of the consideration of economic factors in site test and indoor model test, what obtain also can only be comparatively average surface friction performance within the scope of thick soil stratum in the past.Meanwhile, before Practical Project is started building, test test in advance can also be carried out, instructs and optimize the design proposal of engineering.
Accompanying drawing explanation
Fig. 1 is the structural representation of the interface friction performance pilot system of anchor of the present invention or oil and pile;
Fig. 2 is the drop-down moment schematic diagram of pilot system propulsion system of the present invention;
Moment schematic diagram pressed by pilot system propulsion system of the present invention to Fig. 3;
Shown in number in the figure, name is called: 101-sample cylinder; 110-sun-dried mud brick; 201-lifting screw; 202-elevating bracket; 203-actuating unit; 301-counter-force post; 302-hexagonal nut; 303-reaction beam; 304-counter; 305-dormant bolt; 306-counter-force bolt; 401-base; 401a-flange; 401b-seat core; 401c-cavity; 402-cover plate; 402a-flange; 402b-column; 403-bolt pair; 405-guide cylinder; 405a-marginal ridge; 406-gland bonnet; 407-sealing ring; 408-O RunddichtringO; 409-O RunddichtringO; 410-O RunddichtringO; 411-O RunddichtringO; 412-breather valve; 501-transmission rod; The upper adapter of 502-; 503-upper cap nut; The upper stud bolt of 504-; Adapter under 505-; Nut under 506-; Stud bolt under 507-; 601-force snesor; 602-displacement transducer; 603-control/readout instrument; 701-core bar; 701a-outshot; 701b-outshot; 703-gel.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are further described.It should be noted that, embodiment is not construed as limiting the scope of protection of present invention.
Embodiment 1
As depicted in figs. 1 and 2, a kind of for anchor with soil interface friction performance pilot system and test method as described below:
Sample, comprises sample cylinder 101, sun-dried mud brick 110, gel 703 and core bar 701.Arbitrary value in the desirable 5cm ~ 20cm of height of sun-dried mud brick 110, this example is taken as 8cm; Arbitrary value in the desirable 2cm ~ 6cm of diameter of gel 703, this example is taken as 3cm; The diameter of sun-dried mud brick 110 is no less than 5 times of gel diameters, and this example is taken as 30cm; Surface 1 ~ the 4cm of sun-dried mud brick 110 should be given prominence in the lower end of gel 703, and this example gives prominence to 2cm, and object makes gel 703 and sun-dried mud brick 110 in drawing process keep homalographic to shear.So-called gel is refer to that Binder Materials is cementing solidifies the rear cylindric solid formed by grout, sand-cement slurry, chemical grout etc., and this example employing grout is as Binder Materials.The core bar 701 two ends rolled thread of sample, core bar outshot 701a is directed upwardly, and namely the outshot of gel is downward, with reference to Fig. 2.Sample is limited diametrically by the annular flange 401a inwall of base 401 and the annular flange 402a inwall of cover plate 402, and is limited in the axial direction by sample by bolt pair 403.Be provided with O RunddichtringO 411 between sample cylinder 101 and base 401, and be provided with O RunddichtringO 410 between cover plate 402.
Sample is connected with load transfer device by screw thread, load transfer device comprises transmission rod 501, the upper adapter 502 be connected with transmission rod 501 threaded upper ends, the upper cap nut 503 be connected with upper adapter 502 threaded upper ends, the upper stud bolt 504 be flexibly connected with upper cap nut 503, the lower adapter 505 be connected with sample core bar 701 threaded upper ends, the lower nut 506 be connected with lower adapter 505 threaded upper ends, and the lower stud bolt 507 that lower end is flexibly connected with lower nut 506, upper end is threaded with transmission rod 501.Transmission rod 501 is inserted in guide cylinder 405 center pit, and guide cylinder 405 lower end marginal ridge 405a is threaded with the column 402b's on cover plate 402; On cover plate, the axis of column 402b and guide cylinder 405 and the axis of sample are consistent.O RunddichtringO 409 is provided with between the end face and guide cylinder 405 bottom surface of column 402b, at guide cylinder 405 top and the gland bonnet 406 being provided with O-ring seal 408, sealing ring 407 in the annulus between transmission rod 501 and be threaded with guide cylinder 405, by rotary seal lid 406, successively press seal ring 407, O-ring seal 408 realize sealing.The effect of each sealing parts is for ensureing that sample is in sealing state, the water cut of sun-dried mud brick 110 can not change because evaporation waits, and for ensureing sealing effectiveness, one annular recess can be set for any one in two parts connected, O-ring seal half is fixed in this groove with embedding.
The stub end of upper stud bolt 504 and lower stud bolt 507 is elliposoidal, upper cap nut 503 and lower nut 506 have the cavity that can hold stud bolt 504 and lower stud bolt 507 stub end, and the shape of cavity bottom is consistent with the shape of upper stud bolt 504 and lower stud bolt 507 stub end, when elevating mechanism 202 drives base to bottom offset by lifting screw 201, the stub end of upper stud bolt 504 and lower stud bolt 507 can be fitted with ellipsoid with the cavity of upper cap nut 503 and lower nut 506 respectively.The cooperation of ellipsoid form like this, ensure that sample can transmitter shaft pulling force preferably in drawing process, reduces the error of test.
Force snesor 601 lower end is threaded with upper stud bolt 504, upper end is threaded with counter-force bolt 306.The termination of counter-force bolt 306 is imbedded in reaction beam 303, and is fixed by dormant bolt 305 and counter 304.Reaction beam 303 two ends are individually fixed on two counter-force posts 301 by hexagonal nut 302, and keep level.The counter-force mechanism that reaction beam 303 and counter-force post 301 form is tested for anchor and native interface friction performance and is provided counter-force needed for drawing.
Have the cavity 401c that can hold core bar 701 outshot in the seat core 401b of base 401, described cavity 401c bottom is provided with breather valve 412, must open at the trial, prevents from producing negative-pressure sucking during drawing, affects test findings.
With reference to shown in Fig. 2, when simulation test anchor rod drawing, the sample made in advance is placed on the base 401 be connected with elevating mechanism, notices that now gel 703 teat down.Bolt pair 403 is utilized to be fixed between cover plate 402 and base 401 by sample.Lower adapter 505 is screwed into outshot 701a one end of core bar 701, and is connected with force snesor 601 after upper stud bolt 504 is inserted in upper cap nut 503.First guide cylinder 405, O-ring seal 408, sealing ring 407, gland bonnet 406 are inserted in transmission rod 501 aside, transmission rod 501 upper end is screwed into adapter 502, lower end is connected with the lower stud bolt 507 being inserted in lower nut 506, these a series of parts are moved to below upper cap nut 503, upper adapter 502 is screwed in upper cap nut 503, gently lift guide cylinder 405, lower nut 506 is screwed into lower adapter 505.The marginal ridge 405a of guide cylinder 405 is snapped into the column 402b of cover plate 402, threaded together, then by rotary seal lid 406 successively press seal ring 407 and O-ring seal 408.
After sample installs, open breather valve 412, start actuating unit 203, elevating bracket 202 is declined with speed such as the constant speed value of 0.5mm/min continue, and drive base 401 to bottom offset by lifting screw 201, due to the effect of the stationary installations such as bolt pair, sample cylinder 101 and sun-dried mud brick 110 thereupon by under drag, and the friction resistance produced between sun-dried mud brick 110 and gel 703 is successively by core bar 701, lower adapter 505, lower nut 506, lower stud bolt 507, transmission rod 501, upper adapter 502, upper cap nut 503, upper stud bolt 504 and force snesor 601 reach counterforce device.This at present bottom nut bottom curved surface and lower stud bolt stub end, upper cap nut curved surface and upper stud bolt stub end be tightened up laminating, gel is drawn out from sun-dried mud brick.Control/the readout instrument 603 be connected with displacement transducer 602 by force snesor 601 gathers stress and displacement data, until drop-down displacement reaches 5 times of the corresponding displacement of lower pulling force peak value, and termination test.
Embodiment 2
As shown in figures 1 and 3, a kind of interface friction performance pilot system for oil and pile and test method as described below:
Sample, comprises sample cylinder 101, sun-dried mud brick 110, gel 703 and core bar 701.Arbitrary value in the desirable 5cm ~ 20cm of height of sun-dried mud brick 110, this example is taken as 10cm; Arbitrary value in the desirable 2cm ~ 6cm of diameter of gel 703, this example is taken as 4cm; The diameter of sun-dried mud brick 110 is no less than 5 times of gel diameters, and this example is taken as 40cm; Surface 1 ~ the 4cm of sun-dried mud brick 110 should be given prominence in the lower end of gel 703, and this example gives prominence to 3cm, and object makes gel 703 and sun-dried mud brick 110 in drawing process keep homalographic to shear.So-called gel is refer to that Binder Materials is cementing solidifies the rear cylindric solid formed by grout, sand-cement slurry, concrete etc., and this example employing pea gravel concreten is as Binder Materials.The core bar 701 two ends rolled thread of sample, when considering pile foundation top pressure, upward, namely the outshot of gel upwards, with reference to Fig. 3 for outshot 701b projected direction.Sample is limited diametrically by the annular flange 401a inwall of base 401 and the annular flange 402a inwall of cover plate 402, and is limited in the axial direction by sample by bolt pair 403.Be provided with O RunddichtringO 411 between sample cylinder 101 and base 401, and be provided with O RunddichtringO 410 between cover plate 402.
Sample is connected with load transfer device by screw thread, load transfer device comprises transmission rod 501, the upper adapter 502 be connected with transmission rod 501 threaded upper ends, the upper cap nut 503 be connected with upper adapter 502 threaded upper ends, the upper stud bolt 504 be flexibly connected with upper cap nut 503, the lower adapter 505 be connected with sample core bar 701 threaded upper ends, the lower nut 506 be connected with lower adapter 505 threaded upper ends, and the lower stud bolt 507 that lower end is flexibly connected with lower nut 506, upper end is threaded with transmission rod 501.Transmission rod 501 is inserted in guide cylinder 405 center pit, and guide cylinder 405 lower end marginal ridge 405a is threaded with the column 402b's on cover plate 402; On cover plate, the axis of column 402b and guide cylinder 405 and the axis of sample are consistent.O RunddichtringO 409 is provided with between the end face and guide cylinder 405 bottom surface of column 402b, at guide cylinder 405 top and the gland bonnet 406 being provided with O-ring seal 408, sealing ring 407 in the annulus between transmission rod 501 and be threaded with guide cylinder 405, by rotary seal lid 406, successively press seal ring 407, O-ring seal 408 realize sealing.The effect of each sealing parts is for ensureing that sample is in sealing state, the water cut of sun-dried mud brick 110 can not change because evaporation waits, and for ensureing sealing effectiveness, one annular recess can be set for any one in two parts connected, O-ring seal half is fixed in this groove with embedding.
The stub end of upper stud bolt 504 and lower stud bolt 507 is spherical in shape, upper cap nut 503 and lower nut 506 have the cavity that can hold stud bolt 504 and lower stud bolt 507 stub end, upper adapter 502 is consistent with upper stud bolt 504 and lower stud bolt 507 stub end shape with the end face of lower adapter 505, when elevating mechanism 202 drives base to top offset by lifting screw 201, the stub end of upper stud bolt 504 and lower stud bolt 507 can hold out against with sphere with the end face of upper adapter 502 and lower adapter 505.The cooperation of sphere form like this, ensure that sample presses through Cheng Zhongneng transmitter shaft pressure preferably on top, reduces the error of test.
Force snesor 601 lower end is threaded with upper stud bolt 504, upper end is threaded with counter-force bolt 306.The termination of counter-force bolt 306 is imbedded in reaction beam 303, and is fixed by dormant bolt 305 and counter 304.Reaction beam 303 two ends are individually fixed on two counter-force posts 301 by hexagonal nut 302, and keep level.The interface friction performance test that the counter-force mechanism that reaction beam 303 and counter-force post 301 form is oil and pile provides top pressure required counter-force.
Have the cavity 401c that can hold core bar 701 outshot in the seat core 401b of base 401, described cavity 401c bottom is provided with breather valve 412, must open at the trial, prevents from producing superpressure air bag during the pressure of top, affects test findings.
With reference to shown in Fig. 3, when simulation test pile foundation pressurized, the sample made in advance is placed on the base 401 be connected with elevating mechanism, notices that now gel 703 teat upward.Bolt pair 403 is utilized to be fixed between cover plate 402 and base 401 by sample.Lower adapter 505 is screwed into outshot 701b one end of core bar 701, and is connected with force snesor 601 after upper stud bolt 504 is inserted in upper cap nut 503.First guide cylinder 405, O-ring seal 408, sealing ring 407, gland bonnet 406 are inserted in transmission rod 501 aside, transmission rod 501 upper end is screwed into adapter 502, lower end is connected with the lower stud bolt 507 being inserted in lower nut 506, these a series of parts are moved to below upper cap nut 503, upper adapter 502 is screwed in upper cap nut 503, gently lift guide cylinder 405, lower nut 506 is screwed into lower adapter 505.The marginal ridge 405a of guide cylinder 405 is snapped into the column 402b of cover plate 402, threaded together, then by rotary seal lid 406 successively press seal ring 407 and O-ring seal 408.
After sample installs, open breather valve 412, start actuating unit 203, elevating bracket 202 is made to increase with speed such as the constant speed value of 1mm/min continue, and drive base 401 to top offset by lifting screw 201, due to the effect of the stationary installations such as bolt pair 403, sample cylinder 101 and sun-dried mud brick 110 are thereupon by pushing tow, and the friction resistance produced between sun-dried mud brick 110 and gel 703 reaches counterforce device by core bar 701, lower adapter 505, lower stud bolt 507, transmission rod 501, upper adapter 502, upper stud bolt 504 and force snesor 601 successively.This at present the concave top surface of the concave top surface of adapter and lower stud bolt stub end, upper adapter and upper stud bolt stub end held out against laminating, gel is pushed out from sun-dried mud brick.Control/the readout instrument 603 be connected with displacement transducer 602 by force snesor 601 gathers stress and displacement data, until upper pushing moves 5 times that reach the corresponding displacement of lifting force peak value, and termination test.
The specific embodiment of the invention is in sum only the preferred embodiment of the present invention, is not intended to limit the restriction of scope.Therefore, any do within technical characteristic of the present invention change, modification, substitute, combination or simplify, all should be equivalence substitute mode, be included within protection scope of the present invention.
Claims (9)
1. an interface friction performance pilot system for anchor or oil and pile, comprises sample, it is characterized in that, also comprise:
Sample guiding fixing device, described sample guiding fixing device comprises base (401), cover plate (402), web member and the guide cylinder (405) be arranged on cover plate (402) and gland bonnet (406), described sample is fixed diametrically by base (401) and cover plate (402), and is limited in the axial direction by sample by the web member be arranged between base (401) and cover plate (402);
Load transfer device, described load transfer device comprises transmission rod (501), the upper adapter (502) be connected with described transmission rod (501) threaded upper ends, the upper cap nut (503) be connected with described upper adapter (502) threaded upper ends, the upper stud bolt (504) be flexibly connected with described upper cap nut (503), the lower adapter (505) be connected with sample core bar (701) threaded upper ends, the lower nut (506) be connected with described lower adapter (505) threaded upper ends, and lower end is flexibly connected with described lower nut (506), the lower stud bolt (507) that upper end is threaded with described transmission rod (501), described transmission rod (501) is inserted in described guide cylinder (405) and gland bonnet (406) center pit,
Propulsion system, described propulsion system comprise actuating unit (203), elevating bracket (202) and the lifting screw (201) for connecting described elevating bracket (202) and base (401), for the interface friction performance of anchor with soil test and provided lower pulling force, or provide upward pressure for the interface friction performance of oil and pile is tested;
Counterforce device, the counter-force bolt (306) that described counterforce device comprises counter-force post (301), be arranged at reaction beam (303) between counter-force post (301), be arranged at described reaction beam (303) bottom, and for the dormant bolt (305) of fixing described counter-force bolt (306) and counter (304), described counterforce device test and is provided counter-force needed for drawing for the interface friction performance of anchor with soil, or provides counter-force needed for the pressure of top for the interface friction performance test of oil and pile; And
Measure and control device, described measure and control device comprises control/readout instrument (603), be arranged at the displacement transducer (602) on described cover plate (402), and the force snesor (601) that lower end is threaded with described upper stud bolt (504), upper end is threaded with counter-force bolt (306).
2. the interface friction performance pilot system of a kind of anchor according to claim 1 or oil and pile, it is characterized in that: described base (401) and cover plate (402) surrounding respectively correspondence are provided with annular flange, for being limited diametrically by sample.
3. the interface friction performance pilot system of a kind of anchor according to claim 1 or oil and pile, it is characterized in that: described sample and between base (401) and cover plate (402), and be respectively arranged with O RunddichtringO between described cover plate (402) top and described guide cylinder (405) bottom surface;
Sealing ring (407) and O-ring seal (408) is provided with in the annulus formed between described guide cylinder (405) top and described transmission rod (501), successively compress described sealing ring (407) and O-ring seal (408) by rotating described gland bonnet (406), thus realize the sealing of sample.
4. the interface friction performance pilot system of a kind of anchor according to claim 1 or oil and pile, is characterized in that: described base (401) is provided with the cavity (401c) that can hold described sample core bar (701) outshot; Described cavity (401c) is communicated with ambient atmosphere by a vent valve (412).
5. the interface friction performance pilot system of a kind of anchor according to claim 1 or oil and pile, is characterized in that: described upper stud bolt (504) and lower stud bolt (507) stub end shape are spherical or one in elliposoidal;
Described upper cap nut (503) and lower nut (506) are respectively equipped with the cavity that can hold described upper stud bolt (504) and lower stud bolt (507) stub end, and described upper cap nut (503) and lower nut (506) can be freely movable in described cavity.
6. the interface friction performance pilot system of a kind of anchor according to claim 1 or oil and pile, is characterized in that: described web member is bolt pair (403).
7. the interface friction performance pilot system of a kind of anchor according to claim 1 or oil and pile, is characterized in that: described reaction beam (303) is individually fixed on counter-force post (301) by a plurality of hexagonal nuts (302) being arranged on the upper and lower two ends of described counter-force post (301).
8. utilize the interface friction performance pilot system of a kind of anchor described in claim 6 or oil and pile to test a method for anchor-Soil Interface friction performance, comprise the steps:
(1) between propulsion system and counterforce device, successively sample, sample guiding fixing device, load transfer device are installed;
(2) start actuating unit (203) and control elevating bracket (202), drive lifting screw (201) successively, base (401), bolt pair (403), cover plate (402) and sample body move down, and produce a lower pulling force in sample body interior, its lower pulling force is then successively by sample core bar (701), lower adapter (505), lower nut (506), lower stud bolt (507), transmission rod (501), upper adapter (502), upper cap nut (503), upper stud bolt (504) and force snesor (601) reach counterforce device,
(3) control/readout instrument (603) by being connected with force snesor (601) and displacement transducer (602) gathers stress and displacement data, until drop-down displacement is not less than 5 times of the corresponding displacement of lower pulling force peak value, termination test.
9. utilize a method for the interface friction performance pilot system test pile-Soil Interface friction performance of a kind of anchor described in claim 6 or oil and pile, comprise the steps:
(1) between propulsion system and counterforce device, successively sample, sample guiding fixing device, load transfer device are installed;
(2) start actuating unit (203) and control elevating bracket (202), drive successively on lifting screw (201), base (401), bolt pair (403), cover plate (402) and sample body and move, and producing a lifting force in sample body interior, its lifting force then reaches counterforce device by sample core bar (701), lower adapter (505), lower stud bolt (507), transmission rod (501), upper adapter (502), upper stud bolt (504) and force snesor (601) successively;
(3) control/readout instrument (603) by being connected with force snesor (601) and displacement transducer (602) gathers stress and displacement data, until upper pushing moves 5 times that are not less than the corresponding displacement of lifting force peak value, termination test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176877.6A CN103940735B (en) | 2014-04-29 | 2014-04-29 | The interface friction performance pilot system of a kind of anchor or oil and pile and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176877.6A CN103940735B (en) | 2014-04-29 | 2014-04-29 | The interface friction performance pilot system of a kind of anchor or oil and pile and test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103940735A CN103940735A (en) | 2014-07-23 |
| CN103940735B true CN103940735B (en) | 2016-03-30 |
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| CN105220716B (en) * | 2015-09-08 | 2017-05-10 | 吉林建筑大学 | Half-face pile small-scale model vertical pressure-resistant pulling-resistant test multipurpose loading rack |
| CN106018102B (en) * | 2016-07-29 | 2019-11-15 | 兰州大学 | Building earthen ruins group's anchor pull-out test system |
| CN106644763B (en) * | 2016-12-28 | 2020-06-16 | 兰州大学 | Earthen site anchoring slurry-matrix interface mechanical property test device and method |
| CN107796754B (en) * | 2017-05-19 | 2024-04-23 | 浙江元本检测技术股份有限公司 | Device and method for testing friction coefficient of mucky soil by vacuum negative pressure |
| CN110230329A (en) * | 2019-07-12 | 2019-09-13 | 吉林大学 | The pile side friction experimental rig and method of indoor simulation soil around pile stress |
| CN113107467B (en) * | 2021-05-11 | 2022-03-25 | 西南石油大学 | System and method for testing integrity of secondary cementing cement sheath after perforation and fracturing of natural gas well in coal mine overlapping area |
| CN114354486A (en) * | 2022-01-06 | 2022-04-15 | 江苏科技大学 | Device and method for testing bonding performance of geomembrane |
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