CN104977201A - Fixed side confining rock socketed pile testing device and method thereof - Google Patents
Fixed side confining rock socketed pile testing device and method thereof Download PDFInfo
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- CN104977201A CN104977201A CN201510424574.6A CN201510424574A CN104977201A CN 104977201 A CN104977201 A CN 104977201A CN 201510424574 A CN201510424574 A CN 201510424574A CN 104977201 A CN104977201 A CN 104977201A
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Abstract
The invention discloses a fixed side confining rock socketed pile testing device and a method thereof, and relates to a rock body mechanics rock socketed pile technology. The fixed side confining rock socketed pile testing device structurally comprises a lower cover plate, a lower sealing ring, a pressure chamber, an upper sealing ring and an upper cover plate, from bottom to top, which are connected in sequence to form a main body structure, wherein a sealing screw cap is screwed into a grouting exhaust hole, and a screw rod penetrates through a penetrating hole; the screw rod and the screw cap are screwed off to enable the screw rod to enter a threaded hole of the lower cover plate; a rock sample is put into the pressure chamber; a PVC-U pipe is embedded into a drilling hole of the rock sample; a model pile is inserted into the PVC-U pipe through a central guide pipe, and the grouting exhaust hole is uncovered to pour cement paste. The fixed side confined rock socketed pile testing device can simulate the end bearing characteristic of the rock socketed pile in the rock and a confining pressure condition of a rock socketed pile in an actual rock layer under the action of fixed side confining, so that the rule that the bearing force is changed along with the change of the displacement of the pile end is obtained, and the bearing force of the pile end is calculated; furthermore, the standard is uniform, multi-time industrial copying can be realized, and the fixed side confining rock socketed pile testing device is suitable for pouring and testing of various types of rock socketed piles.
Description
Technical field
The present invention relates to rock mass mechanics embedded rock pile technology, particularly relate to a kind of fixation side limit embedded rock pile test unit and method thereof.
Background technology
The stake that stake end embeds in rock mass is called embedded rock pile (also known as embedding rock pier), no matter the rate of decay of rock mass, as long as stake end embeds in rock mass and all can be described as embedded rock pile, the difference embedding its characteristic of embedded rock pile in different qualities rock mass is caused by the difference of rock mass characteristic.
At present, the model test apparatus of embedded rock pile fairly simple and not system and specification.Most employing is holed on the large rock mass of sampling, and at the bottom of equating hole, the Model Pile of the later pouring reinforcement concrete in hole in clear hole, tests after condensation reaches design strength on pressing machine.It is larger that the test findings that this method obtains is subject to personal error impact: test the sillar used impact causing size effect not of uniform size, and the concrete technique difference of pouring & maintenance also affects comparatively greatly the intensity of Model Pile; The confined pressure that Model Pile is subject to simultaneously is only the rock mass structure effect of stake week, and confined pressure effect is little, can not react the Pericardial arrest of embedded rock pile at certain depth.
Summary of the invention
Object of the present invention is just to overcome the personal error of existing embedded rock pile model test in sample preparation and stake processed and limits problem without side, a kind of fixation side is provided to limit embedded rock pile sample preparation device and method thereof, can avoid above-mentioned error, effectively the end of simulation embedded rock pile in rock stratum holds characteristic.
The object of the present invention is achieved like this:
One, device
This device comprises Model Pile, upper cover plate, pressure chamber, lower cover, upper O-ring seal, lower seal, screw rod, PVC-U pipe, sealing nut, grout and rock sample;
Upper cover plate is provided with centre pilot pipe, grouting air-discharging hole and perforation;
Lower cover is provided with threaded hole;
Its position and annexation are:
From bottom to top, lower cover, lower seal, pressure chamber, upper O-ring seal and upper cover plate connect to form agent structure successively;
Sealing nut precession grouting air-discharging hole, screw rod is through perforation, and stubborn threaded spindle cap nut makes in the threaded hole of screw rod precession lower cover;
Rock sample is placed in pressure chamber, and be embedded in PVC-U pipe in the boring of rock sample, Model Pile is vertically inserted in PVC-U pipe by centre pilot pipe;
Turn on grouting air-discharging hole joints cement slurry.
Two, method
This method comprises the following steps
1. assemble
Lower cover is placed bottom, placement force room thereon, in pressure chamber, bottom surface is along O-ring seal and lower seal in circle ring center respectively build-in, prevents grout excessive;
2. setting-out
By the hole that drill diameter placed in the middle for the rock sample processed (be highly less than or equal to 120 millimeters, diameter is less than or equal to 90 millimeters) is 20 millimeters, bottom hole pitch is from 50 millimeters, the bottom of rock sample; In pressure chamber, adjust rock sample makes boring placed in the middle, is embedded in boring by the PVC-U pipe of external diameter 20 millimeters, wall thickness 1.35 millimeters and length 70 millimeters, wraps up in a circle plastic sheeting, prevent in grout injection ostium at PVC-U pipe top along girth;
3. fix
Embedded in PVC-U pipe by the centre pilot pipe of Model Pile by upper cover plate, fixed cover plate, makes screw rod pass the perforation of upper cover plate, in the threaded hole that stubborn threaded spindle cap nut makes screw rod screw in lower cover; 4 standing screws are utilized to make upper cover plate, lower cover and pressure chamber reach fixing;
4. slip casting
Turn on 4 sealing nuts of upper cover plate, the high fluidity grout that is stirred injected space between sample and pressure chamber's inwall by grouting air-discharging hole, grout fill full after tighten sealing nut;
1. condense
After grout setting and harden reaches design strength, whole test unit is placed on pressing machine and tests.
The present invention has following advantages and good effect:
1. rock sample not of uniform size can be watered and build up uniform sizes, the test impact avoiding size to differ bringing;
The sample utilizing this device to build is unified standard: diameter 90 millimeters, the cylindrical specimens of high 120 millimeters;
2. utilize the Model Pile of steel round bar to replace traditional reinforced concrete and build Model Pile, avoid the personal error of building Model Pile;
3. 4 grouting air-discharging holes of upper cover plate and 4 bore a hole around cover plate central is that 45 degree of angles are alternately distributed, and makes grouting hole place reserve more activity space, facilitates grouting operation;
4. pressure chamber and upper and lower cover plates is used to provide fixation side to limit, the confined pressure effect that simulation rock sample is subject in actual formation;
5. can obtain the rule that bearing capacity changes with pile end displacement, calculate bearing capacity of pile tip;
6. detachable, conveniently stripped rear secondary uses.
In a word, this device can be simulated the end of embedded rock pile in rock and be held characteristic, use the confined pressure condition of effect simulates embedded rock pile in actual rock stratum of fixation side limit, obtain the rule that bearing capacity changes with pile end displacement, calculate bearing capacity of pile tip, and standard is unified, can realize repeatedly industry and copy, be applicable to building and testing of all kinds of embedded rock pile.
Accompanying drawing explanation
Fig. 1 is the structural representation of this device;
Fig. 2 is this device upper cover plate vertical view and cutting line schematic diagram;
Fig. 3 is the radial longitudinal profile schematic diagram along perforated base line A-A;
Fig. 4 is the radial longitudinal profile schematic diagram along grouting air-discharging centerline hole B-B.
In figure:
1-Model Pile;
2-upper cover plate, 2-1-centre pilot pipe, 2-2-grouting air-discharging hole, 2-3-perforation;
3-pressure chamber;
4-lower cover, 4-1-threaded hole;
5-upper O-ring seal;
6-lower seal;
7-screw rod, 7-1-nut;
8-PVC-U manages;
9-sealing nut;
10-grout;
11-rock sample.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, device
1, overall
As Fig. 1,2,3,4, this device comprises Model Pile 1, upper cover plate 2, pressure chamber 3, lower cover 4, upper O-ring seal 5, lower seal 6, screw rod 7, PVC-U pipe 8, sealing nut 9, grout 10 and rock sample 11;
Upper cover plate 2 is provided with centre pilot pipe 2-1, grouting air-discharging hole 2-2 and perforation 2-3;
Lower cover 4 is provided with threaded hole 4-1;
Its position and annexation are:
From bottom to top, lower cover 4, lower seal 6, pressure chamber 3, upper O-ring seal 5 and upper cover plate 2 connect to form agent structure successively;
Sealing nut 9 precession grouting air-discharging hole 2-2, screw rod 7, through perforation 2-3, is twisted threaded spindle cap nut 7-1 and is made in the threaded hole 4-1 of screw rod 7 precession lower cover 4;
Rock sample 11 is placed in pressure chamber 3, is embedded in PVC-U pipe 8 in the boring of rock sample 11, and Model Pile 1 is vertically inserted in PVC-U pipe 8 by centre pilot pipe 2-1;
Turn on grouting air-discharging hole 2-2 joints cement slurry 10.
Working mechanism:
The main function components of this device is steelwork, detachably.Agent structure is connected to form successively by lower cover 4, lower seal 6, pressure chamber 3, upper O-ring seal 5 and upper cover plate 2, is fixed by four screw rods 7; Pressure chamber 3 is placed with O-ring seal 5 and lower seal 6, for the grout 10 of sealed cast respectively with upper cover plate 2 and lower cover 4 contact position; Upper cover plate 2 is provided with 4 grouting air-discharging hole 2-2 and is convenient to slip casting; Whole test unit is placed on pressing machine and tests after reaching and specifying the length of time and intensity by grout 10 setting and hardening.
2, functional part
01) Model Pile 1
Model Pile 1 is a kind of steel round bar, diameter 16 millimeters, length 220 millimeters.
Its function is: simulating reinforced concrete embedded rock pile, and rigidity is large, and self should diminish.
02) upper cover plate 2
Upper cover plate 2 is a kind of steel circular slabs, diameter 180 millimeters, thick 20 millimeters, is provided with 1 centre pilot pipe 2-1,4 grouting air-discharging hole 2-2 and 4 perforation 2-3, the bottom surface of upper cover plate 2 is provided with groove;
4 grouting air-discharging hole 2-2 and 4 center of 2-3 around upper cover plate 2 of boring a hole is in being evenly alternately distributed (Central Symmetries namely in 45 degree of angles);
* centre pilot pipe 2-1
Centre pilot pipe 2-1 is positioned at upper cover plate 2 center, external diameter 26 millimeters, internal diameter 17 millimeters, wall thickness 4.5 millimeters, for ensureing that Model Pile 1 is vertically inserted in pressure chamber 3.
* grouting air-discharging hole 2-2
Grouting air-discharging hole 2-2 is arranged in upper cover plate 2, and 4 altogether, outward flange at the bottom of hole is close to pressure chamber 3 inwall, and diameter is 10 millimeters, hole depth 17 millimeters, and hole inwall is carved with screw thread; The wheelbase in centre distance upper cover plate 2 center of circle, hole is 40 millimeters, 4 grouting air-discharging hole 2-2 be evenly distributed on 40 millimeters for radius circumferentially; In slip casting process, open grouting air-discharging hole 2-2, grout 10 can be made to flow in space, after slip casting completes, sealing nut 9 is screwed in the 2-2 of grouting air-discharging hole, sealing grouting air-discharging hole 2-2.
* bore a hole 2-3
Perforation 2-3 is arranged in upper cover plate 2, diameter 10.3 millimeters, hole depth 20 millimeters, and 4 altogether, the wheelbase in centre distance upper cover plate 2 center of circle, hole is 77 millimeters, be evenly distributed on 77 millimeters for radius circumferentially, screw rod 7 can be made to pass.4 perforation 2-3 and 4 grouting air-discharging hole 2-2 is that 45 degree of angles are alternately distributed around upper cover plate 2 center.
* groove
Dark 3 millimeters, diameter 120 millimeters (adaptive with the diameter of pressure chamber 3), for fixation pressure room 3.
03) pressure chamber 3
Pressure chamber 3 is a kind of steel cylinder, external diameter 120 millimeters, internal diameter 90 millimeters, and wall thickness 15 millimeters is high 120 millimeters; The upper bottom surface annulus of pressure chamber 3 is provided with groove respectively between two parties, groove external diameter 105 millimeters, and channel section is square, groove depth 2 millimeters, groove width 2 millimeters;
Upper O-ring seal 5 and lower seal 6 is placed in groove.
04) lower cover 4
Lower cover 4 is a kind of steel circular slab, diameter 180 millimeters, thick 20 millimeters, and the position being provided with 4 perforation 2-3 of 4 threaded hole 4-1(and upper cover plate 2 is corresponding);
* threaded hole 4-1
Be arranged in lower cover 4,4 altogether, for standing screw 7, diameter 10 millimeters, hole depth 10 millimeters, the wheelbase in centre distance lower cover 4 center of circle, hole is 77 millimeters, be evenly distributed on 77 millimeters for radius circumferentially.Time fixing, adjustment upper cover plate 2 makes threaded hole 4-1 center overlap at vertical direction with perforation 2-3 center.
* groove
Be provided with groove between two parties at the upper bottom surface of lower cover 4, dark 3 millimeters of groove, diameter 120 millimeters, for fixation pressure room 3.
05) upper O-ring seal 5
Upper O-ring seal 5 is a kind of rubber seal, and specification is 105 × 2, is placed on pressure chamber 3 upper bottom surface along in the groove of circle ring center, for the gap between sealing load room 3 and upper cover plate 2, prevents the excessive of grout 10.
06) lower seal 6
Lower seal 6 is a kind of rubber seal, and specification is 105 × 2, is placed on pressure chamber 3 bottom surface along in the groove of circle ring center, for the gap between sealing load room 3 and lower cover 4, prevents the excessive of grout 10.
07) screw rod 7
The diameter of screw rod 7 is 10 millimeters, and the top of screw rod 7 is provided with nut 7-1, and the bottom of screw rod 7 can precession threaded hole 4-1.
08) PVC-U pipe 8
PVC-U pipe 8 is external diameter 20 millimeters, wall thickness 1.35, long 70 millimeters, and as sealing and guide pipe, be embedded in rock sample boring, wrap up in a circle plastic sheeting at PVC-U pipe 8 top along girth, when can prevent from being in the milk, grout 10 flows in boring.
09) sealing nut 9
Sealing nut 9 is a kind of M10 nut standard component, four altogether, for turning on and seal grouting air-discharging hole 2-2.
10) grout 10
Grout 10 is for pouring into the space between rock sample 11 and pressure chamber 3, and mobility can be conveniently in the milk greatly, and water cement ratio I makes the strength of cement grout after condensation large.
11) rock sample 11
The height of rock sample 11 is less than or equal to 120 millimeters, and diameter is less than or equal to 90 millimeters, pierces the hole of diameter 20 millimeters between two parties, bottom hole pitch bottom rock sample 11 50 millimeters.
Claims (2)
1. a fixation side limit embedded rock pile test unit, is characterized in that:
Comprise Model Pile (1), upper cover plate (2), pressure chamber (3), lower cover (4), upper O-ring seal (5), lower seal (6), screw rod (7), PVC-U pipe (8), sealing nut (9), grout (10) and rock sample (11);
Upper cover plate (2) is provided with centre pilot pipe (2-1), grouting air-discharging hole (2-2) and perforation (2-3);
Lower cover (4) is provided with threaded hole (4-1);
Its position and annexation are:
From bottom to top, lower cover (4), lower seal (6), pressure chamber (3), upper O-ring seal (5) and upper cover plate (2) connect to form agent structure successively;
Sealing nut (9) precession grouting air-discharging hole (2-2), screw rod (7), through perforation (2-3), is twisted threaded spindle cap nut (7-1) and is made in the threaded hole (4-1) of screw rod (7) precession lower cover (4);
Rock sample (11) is placed in pressure chamber (3), is embedded in PVC-U pipe (8) in the boring of rock sample (11), and Model Pile (1) is vertically inserted in PVC-U pipe (8) by centre pilot pipe (2-1);
Turn on grouting air-discharging hole (2-2) joints cement slurry (10).
2., based on the test method of fixation side limit embedded rock pile test unit described in claim 1, it is characterized in that comprising the following steps:
1. assemble
Lower cover (4) is placed bottom, at pressure chamber (3) upper bottom surface along O-ring seal (5) and lower seal (6) in circle ring center respectively build-in, prevents grout (10) excessive thereon placement force room (3);
2. setting-out
By the hole of drill diameter 20 millimeters placed in the middle for the rock sample (11) that processes, bottom hole pitch is from 50 millimeters, the bottom of rock sample (11); In pressure chamber (3), adjust rock sample (11) makes boring placed in the middle, PVC-U pipe (8) of external diameter 20 millimeters, wall thickness 1.35 millimeters and length 70 millimeters is embedded in boring, manage (8) top at PVC-U and wrap up in a circle plastic sheeting along girth, prevent in grout injection (10) ostium;
3. fix
Model Pile (1) is inserted in PVC-U pipe (8) by the centre pilot pipe (2-1) of upper cover plate (2), fixed cover plate (2), make screw rod (7) through the perforation (2-3) of upper cover plate (2), in the threaded hole (4-1) that stubborn nut (7-1) makes screw rod (7) screw in lower cover (4); Utilize that 4 standing screws (7) make upper cover plate (2), lower cover (4) and pressure chamber (3) reach fixing;
4. slip casting
Turn on 4 sealing nuts (9) of upper cover plate (2), the high fluidity grout (10) be stirred is injected space between sample (11) and pressure chamber (3) inwall by grouting air-discharging hole (2-3), grout (10) fill full after tighten sealing nut (9);
5. condense
After grout (10) setting and harden reaches design strength, whole test unit is placed on pressing machine and tests.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510424574.6A CN104977201B (en) | 2015-07-20 | 2015-07-20 | Fixed lateral spacing embedded rock pile experimental rig and its method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510424574.6A CN104977201B (en) | 2015-07-20 | 2015-07-20 | Fixed lateral spacing embedded rock pile experimental rig and its method |
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| CN104977201A true CN104977201A (en) | 2015-10-14 |
| CN104977201B CN104977201B (en) | 2017-10-10 |
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| CN105424487A (en) * | 2016-01-11 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Testing device for simulating static pressure pile-sinking process of steel pipe pile under confining pressure condition and method of testing device |
| CN105547841A (en) * | 2015-12-11 | 2016-05-04 | 中国科学院武汉岩土力学研究所 | Confining pressure-controllable testing apparatus and testing method for lateral friction of rock |
| CN105889247A (en) * | 2016-05-19 | 2016-08-24 | 中民筑友科技投资有限公司 | Expansion tube and fabricated part |
| CN113848121A (en) * | 2021-09-30 | 2021-12-28 | 中煤长江基础建设有限公司 | Test device and method for simulating bearing capacity of rock-socketed pile in rock stratum |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
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| CN105547841A (en) * | 2015-12-11 | 2016-05-04 | 中国科学院武汉岩土力学研究所 | Confining pressure-controllable testing apparatus and testing method for lateral friction of rock |
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| CN105889247A (en) * | 2016-05-19 | 2016-08-24 | 中民筑友科技投资有限公司 | Expansion tube and fabricated part |
| CN113848121A (en) * | 2021-09-30 | 2021-12-28 | 中煤长江基础建设有限公司 | Test device and method for simulating bearing capacity of rock-socketed pile in rock stratum |
| CN113848121B (en) * | 2021-09-30 | 2022-04-01 | 中煤长江基础建设有限公司 | Test device and method for simulating bearing capacity of rock-socketed pile in rock stratum |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
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