CN115094964B - Pile foundation pulling-resistant test device and method adopting assembled jack - Google Patents
Pile foundation pulling-resistant test device and method adopting assembled jack Download PDFInfo
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- CN115094964B CN115094964B CN202210961575.4A CN202210961575A CN115094964B CN 115094964 B CN115094964 B CN 115094964B CN 202210961575 A CN202210961575 A CN 202210961575A CN 115094964 B CN115094964 B CN 115094964B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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Abstract
The invention discloses a pile foundation pulling-resistant test device and a test method adopting an assembled jack, wherein the pile foundation pulling-resistant test device comprises a reaction frame and a hydraulic driving system, wherein the top of the reaction frame is provided with an assembled synchronous jack communicated with the hydraulic driving system, and the assembled synchronous jack is provided with a plurality of groups of steel wire ropes; the reaction frame below is provided with the limiting plate in the spacing hole, and every wire rope of group passes spacing hole and the reinforcing bar fixed connection at test pile top, because wire rope is passed through spacing hole and just is connected with the reinforcing bar at test pile top, opens spacing hole in corresponding reinforcing bar projection position on the limiting plate, and the aperture in spacing hole is slightly greater than wire rope. The effect of spacing hole has guaranteed that the load that pile body reinforcing bar received in the loading process is in vertical direction, has guaranteed that the size and the direction of reinforcing bar atress are unanimous, has guaranteed the homogeneity of atress, has improved test data's accuracy, has avoided partial reinforcing bar atress too big even the condition that appears destroying.
Description
Technical Field
The invention relates to the technical field of pile foundation static load tests, in particular to a pile foundation pulling-out resistance test device and a pile foundation pulling-out resistance test method adopting an assembled jack.
Background
Pile foundations bearing uplift loads are called uplift piles in engineering. The uplift pile is widely used for the uplift resistance of large basements, the uplift resistance of high-rise buildings, the uplift resistance of offshore wharf platforms, anchor pile foundations of suspension bridges and cable-stayed bridges, pile foundations of large ship dock bottom plates, anchor pile foundations in static load test piles and the like.
In areas with higher groundwater levels, when the upper structure is loaded and cannot balance the buoyancy of groundwater, the whole or part of the structure is acted by upward buoyancy. Such as underground ponds, basement structures of buildings, biochemical ponds of sewage treatment plants, etc., must be provided with anti-floating piles. Whether the pulling-resistant bearing capacity of the pulling-resistant pile meets the design requirement determines the safety of the building. The on-site anti-pulling static load test is the most direct and reliable means for determining the bearing capacity of the anti-pulling pile.
In the prior art, the pull-up load of the pull-up resistance static load test on the engineering site on the pile foundation is provided by a counterforce device. The reinforced concrete pile body is generally connected with a counterforce device through an internal reinforcing steel bar, and a drawing load is transmitted to the pile body. The stress difference among different steel bars is large in the load transmission process, and the load acting on the steel bars is not in the vertical direction, so that the condition that an acting point deviates from the center of a pile body in the loading process, and test data are distorted is caused. Meanwhile, the phenomenon of concentrated load on partial reinforcing steel bars of the uplift pile seriously causes the condition that the reinforcing steel bars are damaged and the test cannot be continued, and even causes the problems of pile body damage, personnel safety and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a pile foundation pulling-out resistance test device and a test method by adopting an assembled jack, which solve the problems that in the prior art, when pulling-out resistance static load test is carried out on a pulling-out resistance pile by a counterforce device, the upward load is not in the vertical direction, so that an action point deviates from the center of a pile body, and test data is distorted.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the pile foundation pulling-resistant test device comprises a reaction frame and a hydraulic driving system, wherein the top of the reaction frame is provided with an assembled synchronous jack communicated with the hydraulic driving system, and the assembled synchronous jack is provided with a plurality of groups of steel wire ropes;
the reaction frame below is provided with the limiting plate, is provided with a plurality of spacing holes that extend towards vertical direction on the limiting plate, and the reinforcing bar fixed connection at every wire rope's of group both ends respectively pass corresponding spacing hole and test pile top.
The basic principle of the pile foundation pulling-resistant test device adopting the assembled jack in the scheme is as follows: the pile foundation anti-pulling test device applies pulling load to the test pile through the assembled synchronous jack and the steel wire rope, and as the steel wire rope passes through the limiting hole and is connected with the steel bar at the top of the test pile, the limiting plate is provided with the limiting hole at the projection position of the corresponding steel bar, and the aperture of the limiting hole is slightly larger than that of the steel wire rope. The effect of spacing hole has guaranteed that the load that pile body reinforcing bar received in the loading process is in vertical direction, has guaranteed that the size and the direction of reinforcing bar atress are unanimous, has guaranteed the homogeneity of atress, has improved test data's accuracy, has avoided partial reinforcing bar atress too big even the condition that appears destroying.
Further, as a specific setting mode of the reaction frame, the reaction frame comprises two buttresses arranged on two sides of the test pile, the bottoms of the two buttresses are contacted with the ground, the tops of the two buttresses are provided with cross beams, and the assembled synchronous jack is arranged on the upper end face of the cross beam; the limiting plate is positioned between the cross beam and the test pile, and the limiting plate is fixedly connected with the lower end face of the cross beam through the fixing piece.
Further, the assembled synchronous jack comprises a plurality of jack modules which are mutually communicated, each jack module comprises a cylinder barrel, a moving piston is arranged in each cylinder barrel, an oil cavity is formed in the bottom of each moving piston, and connecting holes which are communicated with the oil cavities are respectively formed in two sides of the bottom of each cylinder barrel; the plurality of groups of steel wire ropes are arranged at the top of the moving piston;
the two adjacent jack modules are communicated with the connecting hole in a matched mode through an internal high-pressure oil pipe, and the jack modules positioned at two ends of the jack modules are communicated with the hydraulic driving system through an external high-pressure oil pipe.
The hydraulic drive system works to the hydraulic oil of assembled synchronous jack input pressure, hydraulic oil gets into the oil pocket through two connecting holes, force the motion piston to drive wire rope upward movement, apply ascending load to the test pile reinforcing bar, the quantity of connection of jack module can be chosen according to engineering actual demand, the quantity of jack module is the half of the reinforcing bar quantity that needs drawing in the test pile, when jack module used alone, outside oil pipe connection is all connected to two connecting holes of oil pocket, and connect in electric oil pump, the function of jack module is the same with single jack function this moment.
Further, as a specific setting mode of the hydraulic driving system, the hydraulic driving system comprises an electric oil pump, the electric oil pump is communicated with jack modules positioned at two ends of the jack modules through an external high-pressure oil pipe, and a pressure gauge for monitoring and outputting hydraulic oil pressure is arranged on the electric oil pump.
Further, a fixed rail for limiting the sliding of the wire rope is arranged at the top of the moving piston. When the fixed track enables the moving piston to drive the steel wire rope to apply upward load to the test pile steel bar, the steel wire rope is ensured to be tensioned only along the longitudinal direction in the loading process, and the transverse sliding of the steel wire rope is avoided.
Further, each telescopic device is arranged on the rope portion of each group of steel wire ropes and comprises a rotary drum with openings at two ends, thread sections with opposite thread directions are respectively arranged on the inner portions of the circumferences of the two ends of the rotary drum, two connecting columns are respectively arranged at the two ends of the rotary drum, external threads are respectively arranged on each connecting column, and the outer ends of the two connecting columns are respectively fixedly connected with the two end parts of the steel wire rope portions. The rotary drum is rotated to force the connecting column to tighten the steel wire rope, so that the length of the steel wire rope can be expanded and contracted in a small extent within a certain range, the pretension of the steel wire rope is completed, the fact that a plurality of jack modules pass through the steel wire rope to carry out the same upward drawing load on different steel bars on the test pile is guaranteed, and the stress of the test pile is uniform.
Further, the end parts of the steel wire ropes of each group are fixedly connected with the steel bars at the top of the test pile through anchoring parts;
each anchoring piece comprises an anchoring barrel, a bottom cover is arranged at the bottom of the anchoring barrel, and a notch for a steel bar at the top of the test pile to pass through is formed in the side wall of the anchoring barrel and the bottom cover;
the top of the anchoring barrel is in threaded connection with a top cover, and the top of the top cover is provided with a connecting piece for fixedly connecting with the end part of the steel wire rope; each anchoring piece further comprises a plurality of fixing strips welded with the circumferential outer wall of the reinforcing steel bar at the top of the test pile, the diameter of the circumcircle of the circumferential outer wall of each fixing strip is larger than the width of the notch, and the fixing strips can be reinforcing steel bars.
The anchoring cylinder is clamped on the test pile steel bar through the notch, a plurality of fixing strips are welded on the circumferential outer wall of the test pile steel bar, the anchoring cylinder is moved upwards, the test pile steel bar welded with the fixing strips is positioned in the anchoring cylinder, the top cover is assembled through threads, and two ends of the steel wire rope are fixedly connected with the connecting piece. The welding and fixing process of the steel bars in the pile foundation anti-pulling test is simplified, the anchoring piece can be detached and reused, and corresponding cost can be saved for the test.
The invention also provides a test method of the pile foundation pulling resistance test device adopting the assembled jack, which comprises the following steps:
step 1, erecting a reaction frame: two buttresses are respectively arranged at two sides of the test pile, and a cross beam is arranged on the two buttresses;
step 2, installing an assembled synchronous jack: arranging a plurality of jack modules in a straight shape on the upper end face of a cross beam, wherein the jack modules positioned at two ends of the jack modules are communicated with a hydraulic driving system through external high-pressure oil pipes, and two adjacent jack modules are communicated through internal high-pressure oil pipes;
step 3: overlapping steel wire ropes: the rope ends of the middle parts of the plurality of steel wire ropes are arranged in a fixed track at the top of the moving piston, the two ends of the plurality of steel wire ropes respectively penetrate through corresponding limiting holes in the limiting plate, and the two ends of each steel wire rope are respectively fixedly connected with the tops of two steel bars corresponding to the test pile through anchoring pieces;
step 4: steel wire rope connected test pile top steel bar: the method comprises the steps of clamping an anchoring cylinder on a test pile steel bar through a notch, welding a plurality of fixing strips on the circumferential outer wall of the test pile steel bar, moving the anchoring cylinder upwards, positioning the test pile steel bar welded with the fixing strips in the anchoring cylinder, assembling a top cover through threads, and fixedly connecting two ends of a steel wire rope with a connecting piece;
step 5: pretension wire rope: rotating the rotary drum to force the connecting column to tighten the steel wire rope, so as to complete the pre-tightening of the steel wire rope;
step 6: and starting the electric oil pump to convey hydraulic oil to the jack modules, applying an upward pulling load to the steel bars at the top of the test pile by the moving piston through the steel wire rope, performing a pulling test on the test pile, and recording the pressure value of the pressure gauge and the upward displacement value of the pile body of the test pile in the pulling test process.
The beneficial effects of the invention are as follows:
1. according to the pile foundation pulling-resistant test device adopting the assembled jack, the limiting plate with the limiting holes is arranged on the counter-force frame, the steel wire rope is connected with the steel bars at the top of the test pile through the limiting holes, the limiting holes are formed in the corresponding steel bar projection positions on the limiting plate, and the aperture of the limiting holes is slightly larger than that of the steel wire rope. The effect of spacing hole has guaranteed that the load that pile body reinforcing bar received in the loading process is in vertical direction, has guaranteed that the size and the direction of reinforcing bar atress are unanimous, has guaranteed the homogeneity of atress, has improved test data's accuracy, has avoided partial reinforcing bar atress too big even the condition that appears destroying.
2. According to the pile foundation pulling-resistant test device adopting the assembled jack, the fixed rail used for limiting the sliding of the steel wire rope is arranged at the top of the moving piston of the jack module, so that the steel wire rope can only be pulled tightly longitudinally in the loading process, the transverse sliding of the steel wire rope is avoided, and the stability of the position of the steel wire rope is improved.
3. According to the pile foundation pulling-resistant test device adopting the assembled jack, the telescopic device is arranged on the rope portion of the steel wire rope, so that the length of the steel wire rope can be expanded and contracted in a small extent in a certain range, the pretension of the steel wire rope is completed, the fact that a plurality of jack modules pass through the steel wire rope to carry out the same upward pulling load on different steel bars on the test pile is guaranteed, and the stress of the test pile is uniform.
4. The combined jack in this scheme is convenient to assemble and disassemble, and the quantity of jack modules can be matched at will, the inner barrel of jack is made square, saves space, increases stability.
Drawings
FIG. 1 is a schematic structural view of a pile foundation anti-pulling test device using an assembled jack.
Fig. 2 is a schematic structural view of an assembled synchronous jack.
Fig. 3 is a schematic structural view of the jack module.
Fig. 4 is an assembly structure diagram of the anchor.
Fig. 5 is a schematic structural view of the anchor cylinder.
Fig. 6 is a schematic structural view of the top cover.
Fig. 7 is a schematic structural view of the telescopic device.
Wherein, 1, a reaction frame; 101. a buttress; 102. a cross beam; 2. assembled synchronous jack; 201. a jack module; 3. a wire rope; 4. a limiting plate; 5. a limiting hole; 6. pile testing; 7. reinforcing steel bars; 8. a cylinder; 9. a moving piston; 10. an oil chamber; 11. a connection hole; 12. an internal high pressure oil pipe; 13. an external high pressure oil pipe; 14. an electric oil pump; 15. a pressure gauge; 16. a fixed rail; 17. a telescoping device; 18. a rotary drum; 19. a connecting column; 20. an anchor; 21. an anchor cylinder; 22. a bottom cover; 23. a notch; 24. a top cover; 25. a connecting piece; 26. and fixing strips.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1, the invention provides a pile foundation pulling-resistant test device adopting an assembled jack, which comprises a reaction frame 1 and a hydraulic driving system, wherein the reaction frame 1 comprises two buttresses 101 arranged on two sides of a test pile 6 as a concrete setting mode of the reaction frame 1, the bottoms of the two buttresses 101 are contacted with the ground, and the tops of the two buttresses 101 are provided with cross beams 102.
The upper end face of the beam 102 is provided with an assembled synchronous jack 2 communicated with a hydraulic driving system, and the assembled synchronous jack 2 is provided with a plurality of groups of steel wire ropes 3.
Preferably, but not limited to, the assembled synchronous jack 2 comprises a plurality of jack modules 201 which are communicated with each other, each jack module 201 comprises a cylinder barrel 8, a moving piston 9 is arranged in each cylinder barrel 8, an oil cavity 10 is arranged at the bottom of each moving piston 9, and connecting holes 11 communicated with the oil cavities 10 are respectively arranged at two sides of the bottom of each cylinder barrel 8; the plurality of groups of steel wire ropes 3 are arranged at the top of the moving piston 9; the two adjacent jack modules 201 are communicated in a mode of matching the inner high-pressure oil pipe 12 with the connecting hole 11, and the jack modules 201 positioned at two ends of the jack modules 201 are communicated with a hydraulic driving system through the outer high-pressure oil pipe 13.
The number of jack modules 201 can be matched according to the number of steel bars at the top of the test pile 6, preferably, the steel cylinder 8 and the moving piston 9 in the jack modules 201 can be square, space is saved, the moving piston 9 in the jack modules 201 can be prevented from rotating in the moving process, and the moving stability is improved.
As shown in fig. 2 and 3, the hydraulic driving system works to input hydraulic oil with pressure to the assembled synchronous jack 2, the hydraulic oil enters the oil cavity 10 through the two connecting holes 11, the moving piston 9 is forced to drive the steel wire rope 3 to move upwards, an upward load is applied to the steel bars 7 of the test pile 6, the number of the jack modules 201 can be selected according to the actual requirements of engineering, the number of the jack modules 201 is half of the number of the steel bars 7 needing to be drawn in the test pile 6, and when the jack modules 201 are used independently, the two connecting holes 11 of the oil cavity 10 are connected with an external oil pipe and are connected with the electric oil pump 14, and at the moment, the function of the jack modules 201 is the same as that of a single jack.
The top of the moving piston 9 is provided with a fixed track 16 for restricting the sliding of the wire rope 3. The fixed track 16 ensures that the steel wire rope 3 can only be tensioned along the longitudinal direction in the loading process when the moving piston 9 drives the steel wire rope 3 to apply an upward load to the steel bars 7 of the test pile 6, and the transverse sliding of the steel wire rope 3 is avoided.
The hydraulic drive system includes an electric oil pump 14, the electric oil pump 14 communicates with jack modules 201 at both ends of the plurality of jack modules 201 through an external high-pressure oil pipe 13, and a pressure gauge 15 for monitoring the output hydraulic oil pressure is provided on the electric oil pump 14.
The below of crossbeam 102 is provided with limiting plate 4, and limiting plate 4 passes through mounting and crossbeam 102, is provided with a plurality of spacing holes 5 that extend towards vertical direction on the limiting plate 4, and the position that a plurality of spacing holes 5 distribute on limiting plate 4 corresponds with the reinforcing bar projection at test stake 6 top on limiting plate 4, and the both ends of every wire rope 3 of group pass respectively corresponding spacing hole 5 and the reinforcing bar 7 fixed connection at test stake 6 top.
Generally, the test pile 6 is in a cylindrical structure, and the steel bars 7 in the test pile 6 are uniformly arranged at annular intervals, so that the limiting plate 4 is arranged into a circular plate-shaped structure, and a plurality of limiting holes 5 corresponding to the positions of the steel bars 7 on the test pile 6 are circumferentially arranged on the limiting plate 4, and the aperture of the limiting holes 5 is slightly larger than that of the steel wire rope 3.
Pile foundation anti-pulling test device is applied to test pile 6 through assembled synchronous jack 2 and wire rope 3 and is pulled out the load, because wire rope 3 is just connected with the reinforcing bar 7 at test pile 6 top through spacing hole 5, opens spacing hole 5 in corresponding reinforcing bar 7 projection position on limiting plate 4, and the aperture of spacing hole 5 is slightly greater than wire rope 3. The effect of spacing hole 5 has guaranteed that the load that pile body reinforcing bar 7 received in the loading process is in vertical direction, has guaranteed that the size and the direction of reinforcing bar 7 atress are unanimous, has guaranteed the homogeneity of atress, has improved test data's accuracy, has avoided partial reinforcing bar 7 atress too big even the condition that appears destroying.
As shown in fig. 7, preferably but in a layout manner, a telescopic device 17 is arranged on the rope portion of each group of steel wire ropes 3, each telescopic device 17 comprises a rotary drum 18 with openings at two ends, threaded sections with opposite screw threads are respectively arranged on the inner circumferences of two ends of the rotary drum 18, two connecting columns 19 are respectively arranged at two ends of the rotary drum 18, external threads are respectively arranged on each connecting column 19, and the outer ends of the two connecting columns 19 are respectively fixedly connected with two ends of the rope portion of the steel wire rope 3. The rotary drum 18 is rotated to force the connecting column 19 to tighten the steel wire rope 3, so that the length of the steel wire rope 3 can be expanded and contracted in a small extent within a certain range, the pre-tightening of the steel wire rope 3 is completed, the fact that the upward drawing loads transmitted by the jack modules 201 to different steel bars 7 on the test pile 6 through the steel wire rope 3 are the same is ensured, and the stress of the test pile 6 is uniform.
And as a concrete connection mode of the end parts of the steel wire ropes 3 and the steel bars 7 at the top of the test pile 6, the end parts of each group of steel wire ropes 3 are fixedly connected with the steel bars 7 at the top of the test pile 6 through anchoring parts 20.
As shown in fig. 4 to 6, each anchoring member 20 comprises an anchoring cylinder 21, a bottom cover 22 is arranged at the bottom of the anchoring cylinder 21, and a notch 23 for allowing the steel bar 7 at the top of the test pile 6 to pass through is arranged on the side wall of the anchoring cylinder 21 and the bottom cover 22; the top of the anchoring barrel 21 is in threaded connection with a top cover 24, and a connecting piece 25 used for fixedly connecting with the end part of the steel wire rope 3 is arranged at the top of the top cover 24; each anchoring member 20 further comprises a plurality of fixing strips 26 welded with the circumferential outer wall of the reinforcing steel bar 7 at the top of the test pile 6, and the diameter of the circumcircle of the circumferential outer wall of the plurality of fixing strips 26 is larger than the width of the notch 23. The fixing strips 26 may be selected from rebar strips.
The anchoring cylinder 21 is clamped on the steel bars 7 of the test pile 6 through the notch 23, a plurality of fixing strips 26 are welded on the circumferential outer wall of the steel bars 7 of the test pile 6, the anchoring cylinder 21 is moved upwards, the steel bars 7 of the test pile 6 welded with the fixing strips 26 are positioned in the anchoring cylinder 21, the top cover 24 is assembled in a threaded mode, and two ends of the steel wire rope 3 are fixedly connected with the connecting pieces 25. The welding and fixing process of the steel bars 7 in the pile foundation anti-pulling test is simplified, the anchoring piece 20 can be detached and reused, and corresponding cost can be saved for the test.
The invention also provides a test method of the pile foundation pulling resistance test device adopting the assembled jack, which comprises the following steps:
step 1, erecting a reaction frame 1: two buttresses 101 are respectively arranged at two sides of the test pile 6, and a beam 102 is arranged on the two buttresses 101;
step 2, installing an assembled synchronous jack 2: arranging a plurality of jack modules 201 on the upper end surface of the beam 102 in a straight shape, wherein the jack modules 201 positioned at two ends of the jack modules 201 are communicated with a hydraulic driving system through an external high-pressure oil pipe 13, and two adjacent jack modules 201 are communicated through an internal high-pressure oil pipe 12;
step 3: lap joint steel wire rope 3: the rope ends in the middle of the plurality of steel wire ropes 3 are arranged in a fixed track 16 at the top of a moving piston 9, the two ends of each steel wire rope 3 respectively pass through corresponding limiting holes 5 on a limiting plate 4, and the two ends of the plurality of steel wire ropes 3 are positioned at the tops of the steel bars 7 of a plurality of test piles 6;
step 4: the steel wire rope 3 is connected with the steel bar 7 at the top of the test pile 6: the anchoring cylinder 21 is clamped on the steel bars 7 of the test pile 6 through the notch 23, a plurality of fixing strips 26 are welded on the circumferential outer wall of the steel bars 7 of the test pile 6, the anchoring cylinder 21 is moved upwards, the steel bars 7 of the test pile 6 welded with the fixing strips 26 are positioned in the anchoring cylinder 21, the top cover 24 is assembled through threads, and two ends of the steel wire rope 3 are fixedly connected with the connecting pieces 25;
step 5: pretension wire rope 3: rotating the rotary drum 18 to force the connecting column 19 to tighten the steel wire rope 3, so as to complete the pre-tightening of the steel wire rope 3;
step 6: the electric oil pump 14 is started to convey hydraulic oil to the jack modules 201, the moving piston 9 applies pulling load to the steel bars 7 at the top of the test pile 6 through the steel wire rope 3, a pulling-resistant test is conducted on the test pile 6, and the pressure value of the pressure gauge 15 and the upward displacement value of the pile body of the test pile 6 are recorded in the pulling-resistant test process.
Claims (4)
1. The pile foundation pulling-resistant test device adopting the assembled jack is characterized by comprising a reaction frame and a hydraulic driving system, wherein the top of the reaction frame is provided with an assembled synchronous jack communicated with the hydraulic driving system, and the assembled synchronous jack is provided with a plurality of groups of steel wire ropes;
a limiting plate is arranged below the reaction frame, a plurality of limiting holes extending towards the vertical direction are formed in the limiting plate, the positions of the plurality of limiting holes distributed on the limiting plate correspond to the positions of the reinforcing steel bars at the top of the test pile projected on the limiting plate, and two ends of each group of steel wire ropes respectively penetrate through the corresponding limiting holes and are fixedly connected with the reinforcing steel bars at the top of the test pile;
each group of the rope parts of the steel wire ropes are provided with a telescopic device, each telescopic device comprises a rotary drum with openings at two ends, threaded sections with opposite screw threads are respectively arranged in the circumferences of the two ends of the rotary drum, two ends of the rotary drum are respectively provided with a connecting column, each connecting column is provided with external threads, and the outer ends of the two connecting columns are respectively fixedly connected with two ends of the rope parts of the steel wire ropes;
the reaction frame comprises two buttresses arranged on two sides of the test pile, the bottoms of the two buttresses are in contact with the ground, the tops of the two buttresses are provided with cross beams, and the assembled synchronous jack is arranged on the upper end face of the cross beam; the limiting plate is positioned between the cross beam and the test pile and is fixedly connected with the lower end face of the cross beam through a fixing piece;
the assembled synchronous jack comprises a plurality of jack modules which are mutually communicated, each jack module comprises a cylinder barrel, a moving piston is arranged in each cylinder barrel, an oil cavity is arranged at the bottom of each moving piston, and connecting holes which are communicated with the oil cavities are respectively arranged at two sides of the bottom of each cylinder barrel;
the plurality of groups of steel wire ropes are arranged at the top of the moving piston;
the two adjacent jack modules are communicated in a mode of matching the internal high-pressure oil pipe with the connecting hole, and the jack modules positioned at the two ends of the jack modules are communicated with the hydraulic driving system through the external high-pressure oil pipe;
the top of the moving piston is provided with a fixed track for limiting the sliding of the steel wire rope.
2. The pile foundation anti-pulling test device adopting the assembled jack according to claim 1, wherein the hydraulic driving system comprises an electric oil pump, the electric oil pump is communicated with jack modules at two ends of the jack modules through an external high-pressure oil pipe, and a pressure gauge for monitoring and outputting hydraulic oil pressure is arranged on the electric oil pump.
3. The pile foundation anti-pulling test device adopting the assembled jack as defined in claim 2, wherein the end parts of each group of steel wire ropes are fixedly connected with the steel bars at the top of the test pile through anchoring parts;
each anchoring piece comprises an anchoring barrel, a bottom cover is arranged at the bottom of each anchoring barrel, and a gap for a steel bar at the top of a test pile to pass through is formed in the side wall of each anchoring barrel and the bottom cover;
the top of the anchoring barrel is in threaded connection with a top cover, and a connecting piece for fixedly connecting with the end part of the steel wire rope is arranged at the top of the top cover;
each anchoring piece further comprises a plurality of fixing strips welded with the circumferential outer wall of the reinforcing steel bar at the top of the test pile, and the diameter of the circumcircle of the circumferential outer wall of each fixing strip is larger than the width of the notch.
4. A test method of a pile foundation pullout test apparatus using an assembly jack as claimed in claim 3, comprising:
step 1, erecting a reaction frame: two buttresses are respectively arranged at two sides of the test pile, and a cross beam is arranged on the two buttresses;
step 2, installing an assembled synchronous jack: arranging a plurality of jack modules in a straight shape on the upper end face of a cross beam, wherein the jack modules positioned at two ends of the jack modules are communicated with a hydraulic driving system through external high-pressure oil pipes, and two adjacent jack modules are communicated through internal high-pressure oil pipes;
step 3: overlapping steel wire ropes: the rope ends of the middle parts of the plurality of steel wire ropes are arranged in a fixed track at the top of the moving piston, the two ends of the plurality of steel wire ropes respectively penetrate through corresponding limiting holes in the limiting plate, and the two ends of each steel wire rope are respectively fixedly connected with the tops of two steel bars corresponding to the test pile through anchoring pieces;
step 4: steel wire rope connected test pile top steel bar: the method comprises the steps of clamping an anchoring cylinder on a test pile steel bar through a notch, welding a plurality of fixing strips on the circumferential outer wall of the test pile steel bar, moving the anchoring cylinder upwards, positioning the test pile steel bar welded with the fixing strips in the anchoring cylinder, assembling a top cover through threads, and fixedly connecting two ends of a steel wire rope with a connecting piece;
step 5: pretension wire rope: rotating the rotary drum to force the connecting column to tighten the steel wire rope, so as to complete the pre-tightening of the steel wire rope;
step 6: and starting the electric oil pump to convey hydraulic oil to the jack modules, applying an upward pulling load to the steel bars at the top of the test pile by the moving piston through the steel wire rope, performing a pulling test on the test pile, and recording the pressure value of the pressure gauge and the upward displacement value of the pile body of the test pile in the pulling test process.
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| CN202210961575.4A CN115094964B (en) | 2022-08-11 | 2022-08-11 | Pile foundation pulling-resistant test device and method adopting assembled jack |
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| CN202210961575.4A CN115094964B (en) | 2022-08-11 | 2022-08-11 | Pile foundation pulling-resistant test device and method adopting assembled jack |
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| CN115094964B true CN115094964B (en) | 2023-04-21 |
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| CN205242466U (en) * | 2015-12-22 | 2016-05-18 | 广东中科华大工程技术检测有限公司 | Vertical resistance to plucking loading test connecting device of pre -buried formula foundation pile |
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| SU897963A1 (en) * | 1980-05-30 | 1982-01-15 | Киевский Отдел Всесоюзного Научно-Исследовательского Института Гидромеханизации Санитарно-Технических И Специальных Строительных Работ | Device for static testing of piles |
| CN209854788U (en) * | 2019-02-24 | 2019-12-27 | 广州市市政工程试验检测有限公司 | Vertical resistance to plucking static load test device of single pile |
| CN110374150A (en) * | 2019-08-26 | 2019-10-25 | 关喜才 | A kind of anti-floating pile vertical load experiment detection method and device equipped with pre-tightening apparatus |
| CN212405281U (en) * | 2020-05-12 | 2021-01-26 | 广东迪科建设工程检测有限公司 | Vertical resistance to plucking static load detection device of single pile |
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2022
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205242466U (en) * | 2015-12-22 | 2016-05-18 | 广东中科华大工程技术检测有限公司 | Vertical resistance to plucking loading test connecting device of pre -buried formula foundation pile |
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