CN103233485A - Pile group model with built-in measuring elements and production method of pile group model - Google Patents
Pile group model with built-in measuring elements and production method of pile group model Download PDFInfo
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- CN103233485A CN103233485A CN2013101654215A CN201310165421A CN103233485A CN 103233485 A CN103233485 A CN 103233485A CN 2013101654215 A CN2013101654215 A CN 2013101654215A CN 201310165421 A CN201310165421 A CN 201310165421A CN 103233485 A CN103233485 A CN 103233485A
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Abstract
A pile group model with built-in measuring elements comprises a bearing platform and a plurality of pile bodies. The pile group model with the built-in measuring elements is characterized in that each pile body is composed of a left half body and a right half body, strain gauges are pasted on inner surfaces of left and right half bodies, and the strain gauges are connected with signal lines; and a plurality of fixing holes are opened on the lower surface of the bearing platform and provided with outlet holes. A production method of the pile group model comprises the steps of a), selecting pile bodies; b), performing laser cutting; c), polishing measurement positions; d), marking the measurement positions; e), cleaning the measurement positions; f), pasting the strain gauges; g), connecting the signal lines; h), fixing left half bodies and right half bodies; i), producing the bearing platform; j), fixing the pile bodies; and k), performing a simulation experiment. By means of the pile group model and the production method, the mode that strain gauges are arranged outside in the past is changed, effects of strain gauges and signal lines on the experiment are avoided, interference of external electromagnetic signals is avoided, the measurement accuracy is guaranteed, and the pile group model with the built-in measuring elements is quite suitable for centrifugal model tests with high experimental condition requirements.
Description
Technical field
The present invention relates to built-in clump of piles model of a kind of measuring cell and preparation method thereof, in particular, relate in particular to a kind of foil gauge and be pasted on built-in clump of piles model of measuring cell of left halfbody and right halfbody inner surface and preparation method thereof, clump of piles model of the present invention not only can be used for general clump of piles model testing, is specially adapted to the high centrifugal model test of requirement for experiment condition.
Background technology
The on-the-spot prototype experiment cycle of pile foundation is long, cost is high, is difficult to carry out multi-state, and many conditions load, and particularly large-scale clump of piles experiment is difficult to realize especially.The pile foundation model is the scaled down version of on-the-spot prototype experiment, by the measurement to the stressed experimental data of pile foundation model, can effectively estimate every performance indications of true engineering structures.Pile body is as the member of pile foundation model, and the foil gauge that generally will test its stressed size sticks on the external surface of pile body.But there is following drawback in the external surface that foil gauge is arranged on pile body: 1, external testing element and holding wire because the size effect enlarges the influence of pile foundation, can change the mechanical characteristic of former pile body model; 2, the holding wire of foil gauge is arranged on the outside on the pile body external surface, and the signal of holding wire is very faint, is subjected to the interference of external electromagnetic signal easily, further influences certainty of measurement; 3, in experiment dynamic load process, pile foundation is subjected to displacement, and the holding wire that usually can cause being attached thereto disconnects, and influence is measured normally.
Summary of the invention
The present invention is in order to overcome the shortcoming of above-mentioned technical problem, and built-in clump of piles model of measuring cell that a kind of foil gauge is pasted on left halfbody and right halfbody inner surface and preparation method thereof is provided.
The built-in clump of piles model of measuring cell of the present invention, the cushion cap of fixing and supporting role and a plurality of pile bodies that are fixed in cushion cap one side have been comprised, its special feature is: described pile body is made up of left halfbody and right halfbody, be pasted with foil gauge on the inner surface of left side halfbody, right halfbody, be connected with holding wire on the foil gauge; The soffit of described cushion cap offers a plurality of for the fixing fixing hole of pile body, offers on the fixing hole and is convenient to the wire hole that holding wire is drawn.
Cushion cap is realized the fixation to pile body, can carry the loading that adds of Different Weight in experimentation.Foil gauge is pasted on the inner surface of left halfbody and right halfbody, and holding wire draws from the internal cavities of pile body, when having avoided effectively that foil gauge was arranged at the pile body appearance in the past, the influence that measurement result is caused.
The built-in clump of piles model of measuring cell of the present invention, described left halfbody and right halfbody are fixed together by welding or self-tapping screw; The bottom of described pile body is provided with shutoff.Bottom at pile body arranges shutoff, can prevent that the material in the ground from entering in the pile body cavity.
The built-in clump of piles model of measuring cell of the present invention, described pile body evenly are fixed on the fixing hole of cushion cap below, offer between adjacent two fixing holes and are convenient to the groove that holding wire passes through; Offer on the upper surface of cushion cap and be convenient to the wire casing that goes out that holding wire passes through.Holding wire can extract easily by the wire casing that goes out of the groove below the cushion cap and top, can avoid interference and destruction to holding wire.Cushion cap not only is used for connecting a clump of piles, also can be used as weighted platform.
The built-in clump of piles model of measuring cell of the present invention, described pile body is seamless steel pipe, the material of cushion cap is aluminium alloys.
The preparation method of the built-in clump of piles model of measuring cell of the present invention, it is characterized in that, may further comprise the steps: a). choose pile body, after actual pile foundation scaled down to be simulated, choose the satisfactory seamless steel pipe of diameter dimension as pile body, and all pile bodies are machined to identical length; B). laser cutting, utilize laser that it is cut along the length direction of pile body, pile body is divided into left halfbody and right halfbody; C). the polishing measuring point, utilize emery wheel or sand paper to be polished in the position of pasting foil gauge on left halfbody and the right halfbody, so that the measuring point is smooth smooth; D). the mark measuring point draws cross wire at the position of foil gauge to be pasted, with the mark measuring point; E). the cleaning measuring point, with the measuring point of the absorbent cotton cleaning right-angled intersection wire tag that is soaked with acetone, to keep cleaning surfaces clean; F). paste foil gauge, apply even, the moderate glue of a layer thickness at the back side of foil gauge, aim at cross wire position on left halfbody and the right halfbody inner surface, carry out the stickup of foil gauge; G). connect holding wire, after foil gauge is pasted and finished, the lead terminal of foil gauge is connected with holding wire, with the output of realization strain signal; H). fixing left halfbody and right halfbody, the form by welding or self-tapping screw connect is fixed together left halfbody and right halfbody, to form constitutionally stable pile body; I). make cushion cap, process fixing hole with the pile body equal diameters at the soffit of cushion cap, and offer groove, wire hole and go out wire casing; J). fixing pile body, by fixing hole pile body is fixed on the cushion cap, and with holding wire by groove, wire hole with go out wire casing and draw, form clump of piles model; K). simulate stressed experiment, the holding wire of drawing is connected with strain detecting equipment, clump of piles model is placed carry out the stressed experiment of model on the experimental facilities and get final product.
The preparation method of the built-in clump of piles model of measuring cell of the present invention, step h) the left halfbody described in and the welding method of right halfbody, may further comprise the steps: h-1). welding, left halfbody and right halfbody are welded together with the form that multiple spot welds, form firm pile body; The position of solder joint is between adjacent two foil gauges, should avoid the foil gauge position, to prevent the too high breakdown strain sheet of temperature; H-2). polish processing, adopt emery wheel or sand paper that the solder joint on the pile body is polished, to avoid solder joint the stressed of pile body impacted;
The self-tapping screw method of attachment of the left halfbody step h) and right halfbody, may further comprise the steps: h-a). the open screw hole, offer a plurality of screw holes in the position that left halfbody is corresponding with right halfbody, and the diameter that guarantees screw hole is less than the diameter of automatic screw, and the position at foil gauge place should be avoided in the position of screw hole; H-b). connect left halfbody and right halfbody, self-tapping screw is screwed in the screw hole, to realize being connected of left halfbody and right halfbody, form firm pile body; H-c). polish processing, adopt emery wheel or sand paper that the two ends of self-tapping screw are polished, with the self-tapping screw of avoiding exposing the stressed of pile body impacted.
The invention has the beneficial effects as follows: clump of piles model of the present invention, realize the stressed detection of pile body by the inner surface that foil gauge is arranged at pile body, change the external form of foil gauge in the past, avoided foil gauge and holding wire to the influence of pile body model mechanical characteristic; Because foil gauge and holding wire all are arranged at the inside of pile body, have avoided the influence of external electromagnetic signal to the foil gauge signal effectively, have guaranteed certainty of measurement.The preparation method of clump of piles model of the present invention adopts laser that seamless steel pipe is cut into left halfbody and right halfbody, does not have loss substantially, and the characteristic of steel pipe is not exerted an influence; After polishing, mark and cleaning, paste foil gauge, realize namely that by welding or self-tapping screw left halfbody and the firm of right halfbody are connected, and can form stable pile body then.Clump of piles model of the present invention, novel structure, the certainty of measurement height can be realized the realistic simulation test to on-the-spot pile foundation, is specially adapted to requirement for experiment condition centrifugal model test very.
Description of drawings
Fig. 1 is the structural representation of left halfbody among the present invention and right halfbody;
Fig. 2 is the structural scheme of mechanism of pile body among the present invention;
Fig. 3 is the vertical view of cushion cap among the present invention;
Fig. 4 is the upward view of cushion cap among the present invention;
Fig. 5 is the perspective view of clump of piles model of the present invention.
Among the figure: 1 pile body, 2 left halfbodies, 3 right halfbodies, 4 foil gauges, 5 holding wires, 6 cushion caps, 7 fixing holes, 8 wire holes, 9 go out wire casing, 10 grooves, 11 shutoff, 12 screw holes, 13 self-tapping screws.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
As shown in Figure 5, provided the perspective view of clump of piles model of the present invention, it is made up of cushion cap 6 and a plurality of pile bodies 1 that are fixed in cushion cap 6 bottoms, and pile body 1 is the scaled down of on-the-spot pile foundation, and cushion cap 6 is realized the fixing and supporting role to pile body 1.In the process of experiment, can will add on the upper surface that loads is positioned over cushion cap 6.
As depicted in figs. 1 and 2, provided respectively left halfbody 2 and right halfbody 3 with and the structural representation of the pile body 1 that forms, pile body 1 adopts left halfbody 2 and right halfbody 3 to constitute, in order to foil gauge 4 is pasted on the inner surface of pile body 1.Pile body 1 can adopt seamless steel pipe, adopts laser to be cut into left halfbody 2 and right halfbody 3.The output of each foil gauge 4 all is connected with holding wire 5, to realize the measurement of foil gauge 4 output signals.Paste foil gauge 4, connect the left halfbody 2 of holding wire 5 and right halfbody 3 can be fixed together by welding or self-tapping screw, to form constitutionally stable pile body 1.
As shown in Figure 3 and Figure 4, provided the top and bottom perspective views of cushion cap 6 respectively, shown in the soffit of cushion cap 6 be provided with and offer fixing hole 7, the diameter of fixing hole 7 is identical with the diameter of pile body 1, to carry out fixing to pile body 1.The number of fixing hole 7 is 9, evenly is distributed as 3 row, 3 row, is connected by groove 10 with the adjacent fixed hole 7 in the delegation, so that the wiring of holding wire 5.Fixing hole 7 of each row has at least one to be provided with wire hole 8, so that the passing of holding wire 5.Also be provided with out wire casing 9 on the cushion cap 6, so that holding wire 5 draws smoothly, and can not influence the loading of weight.
Clump of piles model of the present invention has changed the external form of foil gauge in the past, has avoided foil gauge and holding wire to the influence of pile body model mechanical characteristic, has guaranteed certainty of measurement.
The preparation method of the built-in clump of piles model of measuring cell of the present invention may further comprise the steps:
A). choose pile body, after actual pile foundation scaled down to be simulated, choose the satisfactory seamless steel pipe of diameter dimension as pile body 1, and all pile bodies 1 are machined to identical length;
B). laser cutting, utilize laser that it is cut along the length direction of pile body 1, pile body 1 is divided into left halfbody 2 and right halfbody 3;
Adopt laser cutting that seamless steel pipe is not had loss substantially, can not exert an influence to its performance;
C). the polishing measuring point, utilize emery wheel or sand paper to be polished in the position of pasting foil gauge 4 on left halfbody 2 and the right halfbody 3, so that the measuring point is smooth smooth;
D). the mark measuring point draws cross wire at the position of foil gauge 4 to be pasted, with the mark measuring point;
E). the cleaning measuring point, with the measuring point of the absorbent cotton cleaning right-angled intersection wire tag that is soaked with acetone, to keep cleaning surfaces clean;
F). paste foil gauge, apply even, the moderate glue of a layer thickness at the back side of foil gauge 4, aim at cross wire position on left halfbody and the right halfbody inner surface, carry out the stickup of foil gauge 4;
G). connect holding wire, after foil gauge is pasted and finished, the lead terminal of foil gauge is connected with holding wire 5, with the output of realization strain signal;
H). fixing left halfbody and right halfbody, the form by welding or self-tapping screw connect is fixed together left halfbody 2 and right halfbody 3, to form constitutionally stable pile body;
In this step, the welding method of left halfbody and right halfbody, can adopt following steps:
H-1). welding, left halfbody 2 and right halfbody 3 are welded together with the form that multiple spot welds, form firm pile body 1; The position of solder joint is between adjacent two foil gauges 4, should avoid foil gauge 4 positions, to prevent the too high breakdown strain sheet 4 of temperature;
H-2). polish processing, adopt emery wheel or sand paper that the solder joint on the pile body is polished, to avoid solder joint the stressed of pile body impacted;
In this step, the self-tapping screw method of attachment of left halfbody and right halfbody, can adopt following steps:
H-a). the open screw hole, offer a plurality of screw holes 12 at left halfbody 2 with right halfbody 3 corresponding positions, and guarantee that the diameter of screw hole 12 is less than the diameter of automatic screw 13, and the position at foil gauge 4 places should be avoided in the position of screw hole 12;
H-b). connect left halfbody and right halfbody, self-tapping screw 13 is screwed in the screw hole 12, to realize being connected of left halfbody 2 and right halfbody 3, form firm pile body 1;
H-c). polish processing, adopt emery wheel or sand paper that the two ends of self-tapping screw 13 are polished, with stressed the impacting of 13 pairs of pile bodies 1 of self-tapping screw of avoiding exposing;
I). make cushion cap, process fixing hole 7 with pile body 1 equal diameters at the soffit of cushion cap 6, and offer groove 10, wire hole 8 and go out wire casing 9;
J). fixing pile body, by fixing hole 7 pile body 1 is fixed on the cushion cap 6, and with holding wire 5 by groove 10, wire hole 8 with go out wire casing 9 and draw, form clump of piles model;
K). simulate stressed experiment, the holding wire 5 of drawing is connected with strain detecting equipment, clump of piles model is placed carry out the stressed experiment of model on the experimental facilities and get final product.
The preparation method of clump of piles model of the present invention adopts laser that seamless steel pipe is cut into left halfbody and right halfbody, does not have loss substantially, realizes namely that by welding or self-tapping screw left halfbody and the firm of right halfbody are connected, and can form stable pile body.For centrifugal model test, requirement to pile body is very high, if foil gauge is pasted on the external surface of pile body, can't test at all or be difficult to obtain experimental data accurately, therefore clump of piles model of the present invention is specially adapted to the high centrifugal model test of requirement for experiment condition.
Claims (6)
1. built-in clump of piles model of measuring cell, the cushion cap (6) of fixing and supporting role and a plurality of pile bodies (1) that are fixed in cushion cap one side have been comprised, it is characterized in that: described pile body is made up of left halfbody (2) and right halfbody (3), be pasted with foil gauge (4) on the inner surface of left side halfbody, right halfbody, be connected with holding wire (5) on the foil gauge; The soffit of described cushion cap offers a plurality of for the fixing fixing hole of pile body (7), offers the wire hole (8) of being convenient to holding wire and drawing on the fixing hole.
2. the built-in clump of piles model of measuring cell according to claim 1 is characterized in that: described left halfbody (2) and right halfbody (3) are by welding or self-tapping screw (13) is fixed together; The bottom of described pile body (1) is provided with shutoff (11).
3. the built-in clump of piles model of measuring cell according to claim 1 and 2, it is characterized in that: described pile body (1) evenly is fixed on the fixing hole (7) of cushion cap (6) below, offers between adjacent two fixing holes and is convenient to the groove (10) that holding wire (5) passes through; Offer on the upper surface of cushion cap be convenient to that holding wire passes through go out wire casing (9).
4. the built-in clump of piles model of measuring cell according to claim 1 and 2, it is characterized in that: described pile body (1) is seamless steel pipe, and the material of cushion cap (6) is aluminium alloys.
5. a preparation method that is used for making the built-in clump of piles model of the described measuring cell of claim 1 is characterized in that, may further comprise the steps:
A). choose pile body, after actual pile foundation scaled down to be simulated, choose the satisfactory seamless steel pipe of diameter dimension as pile body (1), and all pile bodies are machined to identical length;
B). laser cutting, utilize laser that it is cut along the length direction of pile body, pile body is divided into left halfbody (2) and right halfbody (3);
C). the polishing measuring point, utilize emery wheel or sand paper to be polished in the position of pasting foil gauge (4) on left halfbody and the right halfbody, so that the measuring point is smooth smooth;
D). the mark measuring point draws cross wire at the position of foil gauge to be pasted, with the mark measuring point;
E). the cleaning measuring point, with the measuring point of the absorbent cotton cleaning right-angled intersection wire tag that is soaked with acetone, to keep cleaning surfaces clean;
F). paste foil gauge, apply even, the moderate glue of a layer thickness at the back side of foil gauge, aim at cross wire position on left halfbody and the right halfbody inner surface, carry out the stickup of foil gauge;
G). connect holding wire, after foil gauge is pasted and finished, lead terminal and the holding wire (5) of foil gauge is connected, with the output of realization strain signal;
H). fixing left halfbody and right halfbody, the form by welding or self-tapping screw connect is fixed together left halfbody and right halfbody, to form constitutionally stable pile body;
I). make cushion cap, process fixing hole (7) with the pile body equal diameters at the soffit of cushion cap (6), and offer groove (10), wire hole (8) and go out wire casing (9);
J). fixing pile body, by fixing hole pile body is fixed on the cushion cap, and with holding wire by groove, wire hole with go out wire casing and draw, form clump of piles model;
K). simulate stressed experiment, the holding wire of drawing is connected with strain detecting equipment, clump of piles model is placed carry out the stressed experiment of model on the experimental facilities and get final product.
6. the method for the built-in clump of piles model of measuring cell according to claim 5 is characterized in that step h) described in left halfbody and the welding method of right halfbody, may further comprise the steps:
H-1). welding, left halfbody (2) and right halfbody (3) are welded together with the form that multiple spot welds, form firm pile body (1); The position of solder joint is between adjacent two foil gauges, should avoid the foil gauge position, to prevent the too high breakdown strain sheet of temperature;
H-2). polish processing, adopt emery wheel or sand paper that the solder joint on the pile body is polished, to avoid solder joint the stressed of pile body impacted;
The self-tapping screw method of attachment of the left halfbody step h) and right halfbody may further comprise the steps:
H-a). the open screw hole, offer a plurality of screw holes (12) in the left halfbody position corresponding with right halfbody, and guarantee that the diameter of screw hole is less than the diameter of automatic screw (13), and the position at foil gauge place should be avoided in the position of screw hole;
H-b). connect left halfbody and right halfbody, self-tapping screw is screwed in the screw hole, to realize being connected of left halfbody and right halfbody, form firm pile body;
H-c). polish processing, adopt emery wheel or sand paper that the two ends of self-tapping screw are polished, with the self-tapping screw of avoiding exposing the stressed of pile body impacted.
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| CN201310165421.5A CN103233485B (en) | 2013-05-08 | 2013-05-08 | Pile group model with built-in measuring elements and production method of pile group model |
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| CN105976695A (en) * | 2016-06-15 | 2016-09-28 | 中国地质大学（武汉） | Teaching aid for calculating bearing capacity of pile group foundation according to physical deep foundation method |
| CN113834842A (en) * | 2021-05-18 | 2021-12-24 | 重庆大学 | Energy pile group pile temperature-deformation measurement transparent soil test device and test method thereof |
| CN114263222A (en) * | 2021-11-24 | 2022-04-01 | 浙江大学 | Model test device and method for measuring ultimate bearing capacity of grouped piles under inclined eccentric load in sandy soil |
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