CN109374388B - Device for accurately positioning model pile position in model pile loading test and using method thereof - Google Patents
Device for accurately positioning model pile position in model pile loading test and using method thereof Download PDFInfo
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- CN109374388B CN109374388B CN201811406985.2A CN201811406985A CN109374388B CN 109374388 B CN109374388 B CN 109374388B CN 201811406985 A CN201811406985 A CN 201811406985A CN 109374388 B CN109374388 B CN 109374388B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract
The invention discloses a device for accurately positioning a model pile position in a model pile loading test and a using method, wherein the device comprises a main body frame, a central positioning and fixing system, a model pile height adjusting system and a lateral fixing system, wherein the central positioning and fixing system considers the manufacturing error of the model pile; the central positioning and fixing system comprises a central positioning fixture, and the central positioning fixture is provided with a split funnel-shaped chuck; the invention realizes accurate positioning, nondestructive maintenance and dismantling of the model pile, and effectively improves the later test precision; the device can test aiming at the conditions of different embedding-fixing ratios by adjusting the height adjusting bolt, is suitable for test designs of different pile diameters, is convenient to manufacture and has wide application range.
Description
Technical Field
The invention relates to a model pile positioning device and a using method thereof, in particular to a device for accurately positioning a model pile in a model pile loading test and a using method thereof.
Background
In recent years, more and more cross-sea and cross-river bridges and construction projects with large volume need to use rock-socketed piles as the foundation of building (structure) to bear huge upper load. The core of the research on the bearing capacity of the rock-socketed pile is to research the interaction of the pile and rock mass around the pile in the loading process of the pile body and the damage mechanism of a pile-rock interface; the comprehensive research on the interaction process of the pile-rock interface and the development mechanism of the fracture surface of the model pile in the loading process requires that the pile-rock interface is in a perfect and undamaged state before the test is started when the model pile is not loaded. At present, tests for observing the interaction process of the pile-rock interface and the development mechanism of the fracture surface are researched by taking artificially poured rock as a carrier, and the purpose is to realize the natural cementing surface of the bored pile-rock in actual engineering. Therefore, the difficulty which must be faced in the test is how to realize the controllable height placement of the model pile, the vibration to eliminate the influence of the pile during the penetration, the long-time maintenance and the nondestructive removal.
In the existing model pile load test, the positioning of the position of the model pile is not accurate enough, and the nondestructive dismantling of the artificial rock sample after the maintenance and hardening are difficult to realize, so that great obstruction is brought to the subsequent model pile load test research; the method has the advantages that accurate, systematic and complete actual measurement data about the socketed pile is limited, the understanding of people on the shearing characteristic of a socketed pile-rock interface and a micro-macro damage mechanism is restricted, the design of the socketed pile is unreasonable, the conservative attitude is kept for the design of the socketed pile, and unnecessary waste and even some errors are caused.
In conclusion, for the model test research of the rock-socketed pile, it is critical and necessary to design a device which can accurately position the model pile and realize nondestructive demolition after the maintenance and hardening of the artificial rock sample are completed.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of accurately positioning the position of a model pile in a socketed pile-rock interface interaction mechanism model test and realizing nondestructive dismantling after maintenance and hardening of an artificial rock sample are completed, the invention provides the device and the use method for accurately positioning the position of the model pile in a model pile loading test, so that the accurate positioning, the nondestructive maintenance and the dismantling of the model pile are realized, the later-stage test precision can be effectively improved, the manufacturing is convenient, and the application range is wide.
The technical scheme is as follows: in order to achieve the above object, the present invention discloses a device for accurately positioning the position of a model pile in a model pile loading test, which comprises: the device comprises a main body frame, a center positioning and fixing system, a model pile height adjusting system and a lateral fixing system, wherein the center positioning and fixing system, the model pile height adjusting system and the lateral fixing system consider the manufacturing errors of the model pile; the method is characterized in that: the main body frame comprises a frame main body, an exhaust hole, a central positioning hole, a model pile height adjusting screw hole, a model pile height adjusting scale, a side fixing screw hole and an anti-blocking hole oblique plane; the center positioning and fixing system considering the manufacturing error of the model pile comprises: the central positioning clamp and the central positioning clamp fixing bolt; the model pile height adjusting system comprises a height adjusting bolt and a height adjusting washer; the lateral fixing system comprises a lateral fixing bolt; the central positioning fixture is provided with a split funnel-shaped chuck.
Preferably, the frame main body is a variable cross-section cylinder and is provided with a plurality of exhaust holes; the outer diameter of the lower end part of the frame main body is matched with a test box for placing model piles and rock/soil mass materials, the lower end part is inserted into the test box, and the upper variable cross section part of the frame main body is in contact with the outer edge of the test box; the length of the lower end part of the frame main body can enable the height adjusting range to cover the pile head height under the condition of different embedment ratios.
Preferably, the main body of the central positioning fixture is a metal round pipe, one end of the main body is provided with a split funnel-shaped chuck, and the metal round pipe above the split funnel-shaped chuck is internally provided with a built-in thread; the central positioning fixture is matched with the wall of the funnel-shaped central positioning hole; the number of the split funnel-shaped clamping heads is 6-8.
Preferably, the lower end of the central positioning hole is funnel-shaped, the size of the central positioning hole is matched with the funnel-shaped end of the central positioning fixture, and when the central positioning fixture is screwed to fix the bolt, the top position of the funnel of the central positioning hole can reliably restrain and tighten the split funnel-shaped chuck of the central positioning fixture.
Preferably, the center positioning fixture fixing bolt lifts the center positioning fixture during the screwing process, so that the bottom end surface of the center positioning fixture is flush with the bottom end surface of the funnel-shaped center positioning hole.
Preferably, the height adjustment scale engraved on the lower side wall of the frame body includes 4 portions, the scale of each portion corresponding to one of the height adjustment screw holes; the anti-plugging hole oblique plane is an annular tangent plane which forms a certain angle with the bottom plane of the device.
Preferably, the height adjusting washer is a cylindrical metal ring, and the inner diameter of the height adjusting washer is slightly larger than the diameter of the lower part of the frame body or equal to the inner diameter of the test box, so that the lower part of the frame body can be smoothly sleeved with the height adjusting washer; the height adjusting washer has an outer diameter identical to that of the larger diameter portion of the upper portion of the frame body.
The use method of the device for accurately positioning the model pile in the model pile loading test comprises the following steps:
(1) pouring the prepared artificial rock slurry or the prepared soil sample into a test box to enable the upper surface of the test box to reach the designated height;
(2) placing the pile head part of the model pile into a split funnel-shaped chuck of a central positioning fixture;
(3) the center positioning fixture and the model pile carried by the center positioning fixture) are horizontally placed and then are sleeved into the funnel-shaped center positioning hole of the frame main body from the lower part;
(4) screwing a central positioning clamp fixing bolt into a screw hole in the upper part of the central positioning clamp from the upper end of the frame main body, enabling the central positioning clamp to continuously rise by the central positioning clamp fixing bolt until the bottom end plane of the central positioning clamp is flush with the bottom surface of the frame main body, clamping the pile head of the model pile by the split funnel-shaped chuck under the constraint action of the side wall of the funnel-shaped central positioning hole, exposing the pile body part, slightly shaking the model pile by hand to check whether the model pile is clamped or not, and completing the assembly of the frame main body, the central positioning clamp and the central positioning clamp fixing;
(5) sequentially screwing the height adjusting bolt into the height adjusting screw hole of the model pile until the nut is tightly attached to the frame main body, and completing the assembly of the frame main body and the central positioning clamp, the central positioning clamp fixing bolt and the height adjusting bolt;
(6) after the steps are completed, the height adjusting gasket is placed on the test box, and the inner edge of the height adjusting gasket is aligned with the inner edge of the test box;
(7) sleeving the assembled parts in the step (5) into cylindrical round holes formed by the inner edge of the height adjusting gasket and the inner edge of the test box in sequence; at the moment, the model pile is at the highest position which can be adjusted;
(8) contrasting the height adjusting scale of the model pile, gradually and symmetrically adjusting the height adjusting bolt until the test design position of the pile, gradually descending the model pile and penetrating into artificial rock slurry in the adjusting process, observing the height adjusting scale (5) to ensure that the readings of all scale strips are the same;
(9) sequentially screwing the lateral fixing bolts into the lateral fixing screw holes and screwing down;
(10) the whole fixing device and the lower test box are placed on a small vibrating table to vibrate, so that the artificial rock slurry is more uniform and is uniformly contacted with the surface of the pile body, and the influence of the model pile in the step (8) during penetration is eliminated;
(11) putting the whole device into a curing room for curing according to the preparation requirement of the artificial rock, and taking out the device after curing; confirming whether the lateral fixing bolt is in a screwing state or not;
(12) reversely rotating the central positioning clamp to fix the bolt to loosen the bolt until the bolt is completely separated;
(13) reversely rotating the lateral fixing bolt to loosen the lateral fixing bolt until the bolt is completely separated, and taking out the bolt;
(14) slowly moving the main structure upwards until the main structure is completely separated from the height adjusting gasket and the test box;
(15) and (4) removing the central positioning clamp and the height adjusting washer, and starting the test when the model pile is in place.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) the device can realize accurate positioning, nondestructive maintenance and dismantling of the model pile on the basis of ensuring the perpendicularity of the pile body, and can effectively improve the later test precision;
(2) the device can test aiming at different embedding-fixing ratios by adjusting the height adjusting bolt, so that the height adjusting system of the length hole model pile of the main body frame part inserted into the test box can be adjusted according to test requirements in the process of manufacturing the device, and the application range is wide; the split funnel-shaped chuck can adapt to model piles with small manufacturing errors, and for the situation of large difference of pile diameters, the utilization rate of the split funnel-shaped chuck can be improved by adopting a method of adding cushion layers on the pile head, so that the split funnel-shaped chuck is also suitable for test design of different pile diameters;
(3) the requirement on the scale is small, and the device can be used for indoor model tests with small specifications and large specifications;
(4) the device is simple in manufacturing method, convenient to use and easy to popularize.
Drawings
FIG. 1 is a top plan view of the apparatus of the present invention;
FIG. 2 is a bottom view of the device of the present invention;
FIG. 3 is a front elevation view in the direction of the arrows in FIG. 1;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 6(a) is a top view of the centering fixture;
FIG. 6(b) is a cross-sectional view of the centering fixture taken along line C-C of FIG. 6 (a);
FIG. 7 is a top plan view and an elevational view of a center positioning fixture attachment bolt;
FIG. 8 is an assembled cross-sectional view of the centering clip and the centering clip fixing bolt;
FIG. 9(a) is a top plan view and a bottom plan view of the main body frame;
FIG. 9(b) is a sectional view of the main body frame taken along the line D-D and the line E-E in FIG. 9 (a);
FIG. 10(a) is a schematic view of the use of the centering fixture and the height adjustment system;
FIG. 10(b) is a schematic view showing the use of the lateral fixation system;
FIG. 11 is a top plan view of the entire apparatus with test cartridges and dummy piles;
FIG. 12 is a cross-sectional view taken along line F-F and line G-G of FIG. 11 (2 side anchor bolts rotationally superimposed on the F-F section to the G-G section).
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The invention discloses a device for accurately positioning the position of a model pile in a model pile loading test, which comprises: the main body frame, the central positioning and fixing system considering the manufacturing error of the model pile, the model pile height adjusting system and the lateral fixing system.
As shown in fig. 1 to 5, the main body frame includes: the device comprises a frame main body 1, an exhaust hole 2, a central positioning hole 3, a model pile height adjusting screw hole 4, a model pile height adjusting scale 5, a side fixing screw hole 6 and an anti-blocking hole bevel 7; a plurality of exhaust holes 2 are formed in the frame main body 1, so that air can be smoothly exhausted when the fixing device is placed in the test box, and sufficient air circulation and air inlet of the manually prepared rock material are ensured in the curing and hardening process; the lower end of the central positioning hole 3 is funnel-shaped.
In order to realize the circular scanning and the three-dimensional reconstruction conveniently, in the model pile load test, the test box 15 for placing the model pile 13 and the rock/soil material 14 is mainly a cylindrical cavity, so that the embodiment is described by taking a cylindrical frame body as an example (other geometric types can be correspondingly modified by referring to the design concept). As shown in fig. 9, the frame body 1 is a variable cross-section cylinder, and the diameter of its lower end portion is small, and the outer diameter of the lower end portion is matched with the test cartridge 15, so that the portion can be inserted into the test cartridge 15 and the upper variable cross-section of the frame body is contacted with the outer edge of the test cartridge. The length of the lower end part of the frame body 1 can be designed according to the experimental design requirements, so that the height adjusting range of the device covers the pile head height under the condition of different embedment ratios. The frame main body is made of metal materials, and stainless steel materials can be selected to prevent corrosion in the maintenance stage.
As shown in fig. 4-5 and 9, the model pile height adjusting screw holes 4 are composed of 4 height adjusting screw holes uniformly distributed along the circumference, so as to ensure that the condition that the leveling cannot be performed when the height of the device is adjusted is avoided; the height adjusting scale 5 engraved on the lower side wall of the frame body 1 includes 4 parts, and the scale of each part corresponds to one of the height adjusting screw holes 4; the side fixing screw holes 6 are formed by 4 screw holes, and accurate positioning and horizontal accuracy are required to ensure that the force application points of all fixing bolts are located in the same horizontal plane. The anti-clogging chamfer 7 is an annular tangent plane that makes a certain angle with the bottom surface of the device to prevent clogging of the vent holes when the artificially prepared rock interface contacts the bottom surface of the fixation device.
As shown in fig. 6 to 8, the centering and fixing system considering the manufacturing error of the model pile includes a centering jig 8 and a centering jig fixing bolt 9. The central positioning clamp 8 is a metal round pipe with a split funnel-shaped chuck at one end, and screws are arranged in the part of the round pipe above the split funnel-shaped chuck. The split funnel-shaped chuck has the function of fully considering the manufacturing error of the model pile and enhancing the applicability of the model pile; the size of the central positioning hole 3 is matched with the funnel-shaped end part of the split funnel-shaped chuck, and when the central positioning clamp fixing bolt 9 is screwed, the funnel top position of the central positioning hole 3 can reliably restrain and tighten the split funnel-shaped chuck of the central positioning clamp 8. As shown in fig. 11-12, after the model pile 13 is placed into the chuck, the central positioning fixture fixing bolt 9 makes the central positioning fixture 8 rise integrally, and the split chuck is restrained reliably by the sidewall of the central positioning hole 3, so that the chuck can clamp the model pile 13 sufficiently, and the pile body is ensured not to displace in the maintenance and hardening processes. The number of lobes of the collet can preferably be made 6-8 lobes.
The centering fixture needs to have an accurate machining dimension to match the hole wall of the funnel-shaped centering hole 3. In addition, for the experiment with a plurality of pile diameters with larger difference, the diameter of the split funnel-shaped chuck can be determined by the maximum pile diameter; when a pile with a smaller diameter needs to be clamped, the utilization rate of the pile can be improved by adding a cushion layer on the pile head, so that the method is also suitable for test designs with different pile diameters. In addition, the centering fixture also needs to have accurate machining dimension to match with the funnel-shaped centering hole 3. In order to avoid corrosion in the maintenance stage, the center positioning fixture 8 is made of stainless steel.
In addition, the length of the thread of the fixing bolt 9 of the center positioning fixture is set to ensure that the center positioning fixture 8 is lifted in the screwing process, so that the bottom end surface of the center positioning fixture is flush with the bottom end surface of the funnel-shaped center positioning hole 3.
As shown in fig. 4 and 5, the model pile height adjusting system includes: a height adjusting bolt 10 and a height adjusting washer 12; the height adjusting bolt 10 is composed of 4 bolts, and the length of the bolts is ensured to be consistent, so that leveling can be conveniently carried out by contrasting scales. The height adjusting washer 12 is a cylindrical metal ring with sufficient rigidity; the inner diameter of the height adjusting gasket is slightly larger than the diameter of the lower part of the frame main body or equal to the inner diameter of the test box so as to ensure that the lower part of the frame main body can be smoothly sleeved in the height adjusting gasket; the outer diameter of the height adjusting washer is the same as the larger diameter part of the upper part of the device, and meanwhile, the machining precision is guaranteed, so that the heights of all cross sections are the same. The height adjusting washer is made of stainless steel.
The lateral fixing system comprises a lateral fixing bolt 11; fig. 11 to 12 are overall schematic views of the apparatus after the test cartridge and the model pile are added, and since the lateral fixing bolts 11 and the height adjusting bolts 10 cannot be shown in the same sectional view, fig. 12 is a view of rotationally overlapping 2 lateral fixing bolts 11 of the F-F section to the G-G section for the sake of better illustration of the internal structure of the apparatus. As shown in fig. 11-12, the lateral fixing bolt 11 is composed of 4 bolts, and the four bolts have the same geometric size, so as to fix the central positioning jig 8 from 4 directions at the same time.
The use method of the device for accurately positioning the model pile in the model pile loading test comprises the following steps:
(1) pouring the prepared artificial rock slurry or soil sample 14 into a test box 15, and enabling the upper surface of the material to reach the test design height;
(2) putting the pile head of the model pile 13 into the split chuck of the central positioning clamp 8;
(3) sleeving the central positioning clamp 8 and the model pile 13 carried by the central positioning clamp into the central positioning hole 3 of the frame main body 1 from the lower part;
(4) screwing a central positioning clamp fixing bolt 9 into an upper screw hole of the central positioning clamp 8 from the upper end of the frame main body 1, and rotating the central positioning clamp fixing bolt 9 to enable the central positioning clamp 8 to continuously rise until the bottom end plane of the central positioning clamp 8 is flush with the bottom surface of the frame main body 1; at the moment, due to the constraint action of the side wall of the central positioning hole 3, the split funnel-shaped chuck clamps the pile head of the model pile, the pile body is partially exposed, the model pile is slightly shaken by hands to check whether the model pile is clamped, and at the moment, the assembly of the frame main body 1, the central positioning clamp 8 and the central positioning clamp fixing bolt 9 is finished;
(5) sequentially screwing the height adjusting bolts 10 into the model pile height adjusting screw holes 4 until the screw caps are tightly attached to the frame main body 1, and assembling the main body frame 1 with the central positioning clamp 8, the central positioning clamp fixing bolt 9 and the height adjusting bolts 10;
(6) placing the height adjusting gasket 12 on the test box 15 to ensure that the inner edge of the height adjusting gasket 12 is aligned with the inner edge of the test box 15;
(7) sleeving the assembled parts in the step (5) into round holes formed by the inner edge of the height adjusting gasket 12 and the inner edge of the test box in sequence; at the moment, because the part of the height adjusting bolt extending out of the main body frame 1 is completely exposed, the model pile is at the highest position which can be adjusted;
(8) comparing the model pile height adjusting scale 5, gradually and symmetrically adjusting the height adjusting bolts 10 until the design position of the model pile, wherein the model pile gradually descends and gradually penetrates into artificial rock slurry in the adjusting process, and the perpendicularity of the model pile can be effectively ensured by the same reading of the height adjusting scale 5; at the moment, the model pile penetrates into the artificial rock slurry or soil sample and is fixed at the designed height;
(9) screwing the lateral fixing bolts 11 into the lateral fixing screw holes 6 in sequence and screwing the lateral fixing bolts;
(10) placing the whole fixing device and the lower test box on a small vibration table to vibrate so that the artificial rock slurry is more uniform and is uniformly contacted with the surface of the pile body, and eliminating the influence when the step (8) is penetrated;
(11) putting the whole device into a curing room for curing according to the vegetation requirements of artificial rocks, and taking out the device after curing; confirming whether the lateral fixing bolt 11 is screwed;
(12) the central positioning clamp fixing bolt 9 is rotated reversely to be loosened until the bolt is completely separated, and the central positioning clamp 8 is ensured not to rotate along with the bolt to damage a pile-rock interface when the central positioning clamp fixing bolt 9 is rotated under the action of the lateral fixing bolt;
(13) reversely rotating the lateral fixing bolt 11 to loosen the bolt until the bolt is completely separated, and taking out the bolt;
(14) the body structure is slowly moved upwards until it is completely detached from the height adjusting washer 12 and the test cartridge;
(15) the centering fixture 8 and the height adjusting washer 12 are removed and the test can be started with the model pile in place.
Claims (9)
1. An apparatus for accurately positioning a model pile in a model pile loading test, comprising: the device comprises a main body frame, a center positioning and fixing system, a model pile height adjusting system and a lateral fixing system, wherein the center positioning and fixing system, the model pile height adjusting system and the lateral fixing system consider the manufacturing errors of the model pile; the method is characterized in that: the main body frame comprises a frame main body (1), an exhaust hole (2), a center positioning hole (3), a model pile height adjusting screw hole (4), a model pile height adjusting scale (5), a side fixing screw hole (6) and an anti-blocking hole oblique plane (7); the center positioning and fixing system considering the manufacturing error of the model pile comprises: a center positioning clamp (8) and a center positioning clamp fixing bolt (9); the model pile height adjusting system comprises a height adjusting bolt (10) and a height adjusting washer (12); the lateral fixing system comprises a lateral fixing bolt (11); the central positioning clamp (8) is provided with a split funnel-shaped chuck; the exhaust hole (2) is formed in the frame main body (1), and the bottom of the frame main body (1) is provided with an anti-blocking hole bevel surface (7) for preventing the exhaust hole (2) from being blocked; the central positioning hole (3) is formed in the frame main body (1) and penetrates through the upper surface and the lower surface of the frame main body (1), a central positioning clamp (8) is arranged in the central positioning hole (3), a central positioning clamp fixing bolt (9) is arranged in the central positioning hole (3) and matched with the central positioning clamp (8), the lower end of the central positioning hole (3) is funnel-shaped, the size of the central positioning hole is matched with the funnel-shaped end portion of the central positioning clamp, and when the central positioning clamp fixing bolt (9) is screwed, the top position of a funnel of the central positioning hole (3) can reliably restrain and tighten a split funnel-shaped chuck of the central positioning clamp (8); model pile altitude mixture control screw (4) set up on frame main part (1), set up altitude mixture control packing ring (12) under model pile altitude mixture control screw (4), altitude mixture control bolt (10) support on altitude mixture control packing ring (12) through model pile altitude mixture control screw (4) from frame main part (1) upper surface, frame main part (1) side sets up model pile altitude mixture control scale (5) for measure the position of the relative frame main part (1) in altitude mixture control bolt (10) bottom, side fixed screw (6) intercommunication center locating hole (3) and the side of frame main part (1), side fixed bolt (11) pass side fixed screw (6) fixed center positioning fixture (8).
2. The apparatus of claim 1, wherein: the frame main body (1) is in a variable cross-section cylindrical shape and is provided with a plurality of exhaust holes (2); the outer diameter of the lower end part of the frame main body (1) is matched with a test box for placing model piles and rock/soil mass materials, the lower end part is inserted into the test box, and the upper variable cross section part of the frame main body is in contact with the outer edge of the test box; the length of the lower end part of the frame main body (1) can enable the height adjusting range to cover the pile head height under the condition of different embedding ratios.
3. The apparatus of claim 1, wherein: the main body of the central positioning clamp (8) is a metal round pipe, one end of the main body is provided with a split funnel-shaped chuck, and built-in threads are arranged in the metal round pipe above the split funnel-shaped chuck; the central positioning fixture is matched with the hole wall of the funnel-shaped central positioning hole (3).
4. The apparatus of claim 3, wherein: the number of the split funnel-shaped clamping heads is 6-8.
5. The apparatus of claim 1, wherein: the central positioning clamp fixing bolt (9) lifts the central positioning clamp (8) in the screwing process, so that the bottom end surface of the central positioning clamp is flush with the bottom end surface of the funnel-shaped central positioning hole (3).
6. The apparatus of claim 1, wherein: the height adjusting scale engraved on the lower side wall of the frame body (1) includes 4 portions, and the scale of each portion corresponds to one of the height adjusting screw holes (4).
7. The apparatus of claim 1, wherein: the anti-blocking hole bevel surface (7) is an annular tangent plane which forms a certain angle with the bottom plane of the device.
8. The apparatus of claim 1, wherein: the height adjusting washer (12) is a cylindrical metal ring, the inner diameter of the height adjusting washer is slightly larger than the diameter of the lower part of the frame main body or equal to the inner diameter of the test box, so that the lower part of the frame main body can be smoothly sleeved with the height adjusting washer; the height adjusting washer has an outer diameter identical to that of the larger diameter portion of the upper portion of the frame body.
9. Use of a device for accurately positioning model pile position in model pile loading test according to any one of claims 1-8, characterized in that: the method comprises the following steps:
(1) pouring the prepared artificial rock slurry or the prepared soil sample into a test box to enable the upper surface of the test box to reach the designated height;
(2) putting the pile head part of the model pile into a split funnel-shaped chuck of a central positioning clamp (8);
(3) horizontally placing the central positioning clamp (8) and the model pile (13) carried by the central positioning clamp, and then sleeving the central positioning clamp into the funnel-shaped central positioning hole (3) of the frame main body (1) from the lower part;
(4) screwing a central positioning clamp fixing bolt (9) into a screw hole in the upper part of the central positioning clamp (8) from the upper end of the frame main body (1), enabling the central positioning clamp (8) to continuously rise by the central positioning clamp fixing bolt (9) until the bottom end plane of the central positioning clamp is flush with the bottom surface of the frame main body (1), clamping the pile head of the model pile by a split funnel-shaped chuck under the constraint action of the side wall of the funnel-shaped central positioning hole (3), exposing the pile body part, slightly shaking the model pile by hand to check whether the model pile is clamped or not, and completing the assembly of the frame main body (1), the central positioning clamp (8) and the central positioning clamp fixing bolt (9);
(5) sequentially screwing the height adjusting bolts (10) into the model pile height adjusting screw holes (4) until the screw caps are tightly attached to the frame main body (1), and assembling the frame main body (1) with a central positioning clamp (8), a central positioning clamp fixing bolt (9) and the height adjusting bolts (10);
(6) after the steps are completed, the height adjusting gasket (12) is placed on the test box, and the inner edge of the height adjusting gasket (12) is aligned with the inner edge of the test box;
(7) sleeving the assembled parts in the step (5) into cylindrical round holes formed by the inner edge of the height adjusting gasket (12) and the inner edge of the test box in sequence; at the moment, the model pile is at the highest position which can be adjusted;
(8) contrasting the model pile height adjusting scales (5), gradually and symmetrically adjusting the height adjusting bolts (10) until the test design position of the pile, gradually descending the model pile and penetrating into artificial rock slurry in the adjusting process, observing the height adjusting scales (5) to ensure that the readings of all the scale strips are the same;
(9) screwing the lateral fixing bolts (11) into the lateral fixing screw holes (6) in sequence and screwing the lateral fixing bolts;
(10) the whole fixing device and the lower test box are placed on a small vibrating table to vibrate, so that the artificial rock slurry is more uniform and is uniformly contacted with the surface of the pile body, and the influence of the model pile in the step (8) during penetration is eliminated;
(11) putting the whole device into a curing room for curing according to the preparation requirement of the artificial rock, and taking out the device after curing; confirming whether the lateral fixing bolt (11) is in a tightened state;
(12) the central positioning clamp is rotated reversely to fix the bolt (9) to be loosened until the bolt is completely separated;
(13) reversely rotating the lateral fixing bolt (11) to loosen the bolt until the bolt is completely separated, and taking out the bolt;
(14) moving the main structure slowly upwards until the main structure is completely separated from the height adjusting gasket (12) and the test box;
(15) and (4) removing the central positioning clamp (8) and the height adjusting washer (12), and starting the test when the model pile is in place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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