CN108035389B - Auxiliary equipment for measuring static load test of foundation - Google Patents
Auxiliary equipment for measuring static load test of foundation Download PDFInfo
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- CN108035389B CN108035389B CN201810086546.1A CN201810086546A CN108035389B CN 108035389 B CN108035389 B CN 108035389B CN 201810086546 A CN201810086546 A CN 201810086546A CN 108035389 B CN108035389 B CN 108035389B
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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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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to auxiliary equipment for foundation static load test measurement, which comprises an iron disc, a first vertical plate, a second vertical plate, a transverse plate, a third vertical plate, a plurality of first screws and second screws, wherein a dovetail groove is formed in one side of the second vertical plate, a lug matched with the dovetail groove is fixedly arranged on one side of the first vertical plate, a first screw hole matched with the first screw is further formed in the first vertical plate, a plurality of waist-shaped first through holes are respectively formed in two sides of the dovetail groove, a convex plate is fixedly arranged at the upper end of the first vertical plate, a cleaning sleeve is sleeved outside the convex plate, brush wires are arranged between the cleaning sleeve and the inner wall of the dovetail groove, and triangular convex parts are fixedly arranged at the upper end of the convex plate. This auxiliary assembly for foundation static test measurement simple structure, convenient to use, even the degree of depth of test pit is too dark, also can very conveniently erect the displacement meter, the high adjustment of displacement meter is convenient and be difficult for producing the error, implements effectually.
Description
Technical Field
The invention relates to auxiliary equipment for measuring static load test of foundation, belonging to the technical field of building engineering material performance test equipment.
Background
Technical measures taken to improve the deformability or permeability of the foundation in order to increase the bearing capacity of the foundation are called foundation treatments. The foundation treatment comprises the steps of replacing a filling cushion layer, pre-pressing the foundation, compacting the foundation, tamping the foundation, grouting, reinforcing and the like, and the main points of a static load test of the treated foundation are the bearing capacity and deformation parameters of the soil layer in the main influence range of the stress of the bearing plate of the treated foundation. The area of the pressing plate adopted in the plate static load test is determined by checking the thickness of the soil layer according to the requirement, and is not smaller than 1.0m 2 The method comprises the steps of carrying out a first treatment on the surface of the For compacting foundation, it is not suitable to be less than 2.0m 2 . The composite foundation static load test is suitable for single pile composite foundation static load test and multi-pile composite foundation static load test, and is used for measuring the bearing capacity of the composite soil layer in the main influence range of the lower stress of the bearing plate. The composite foundation static load test bearing plate should have sufficient rigidity. The bearing plate of the single pile composite foundation static load test can be round or square, and the area is the treatment area born by one pile; the bearing plate of the multi-pile composite foundation static load test can be square or rectangular, and the size of the bearing plate is determined according to the treatment area born by the actual pile number. The center (or centroid) of the single pile composite foundation static load test pile is consistent with the center of the bearing plate and coincides with the load action point.
The test should be performed at the pile top design elevation. Coarse sand or middle sand cushion layers are paved below the bottom surface of the bearing plate, and the thickness of the cushion layers can be 100 mm-150 mm. The pit width and length at the test elevation should not be less than 3 times the size of the bearing plate. The reference beam and the loading platform fulcrum (or anchor pile) are preferably arranged outside the test pit, and the clear distance between the reference beam and the loading platform fulcrum (or anchor pile) and the pressure-bearing plate edge is not less than 2m.
According to the requirements of building foundation treatment technical specifications, foundation pile beams are erected outside test pits, when the test pits are too deep, a displacement meter for measurement cannot be erected, the displacement meter is usually tied at the lower end of a steel pipe, then the upper end of the steel pipe is tied on a reference beam, the operation is troublesome, and the height adjustment of the displacement meter is troublesome and easy to produce errors.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides auxiliary equipment for measuring a foundation static load test, which comprises the following specific technical scheme:
the utility model provides a foundation static test auxiliary assembly for measurement, includes iron plate, first riser, second riser, diaphragm, third riser, a plurality of first screw, second screw, first riser and iron plate mutually perpendicular, the lower extreme of first riser and one side fixed connection of iron plate, one side of second riser is provided with the dovetail, one side of first riser has set firmly the lug with dovetail matched with, still be provided with the first screw with first screw looks adaptation on the first riser, the both sides of dovetail are provided with a plurality of waist circular first through-holes respectively, first through-hole and dovetail intercommunication; the upper end of the first vertical plate is fixedly provided with a convex plate, the convex plate is arranged in the dovetail groove, a cleaning sleeve is sleeved outside the convex plate, brush wires are arranged between the cleaning sleeve and the inner wall of the dovetail groove, and the tail ends of the brush wires are fixedly connected with the side wall of the cleaning sleeve; the side wall of the cleaning sleeve is also provided with a second screw hole matched with the second screw, and the upper end of the convex plate is fixedly provided with a triangular convex part; the tail end of the transverse plate is fixedly connected with the upper end of the second vertical plate, and the upper end of the third vertical plate is fixedly connected with the head end of the transverse plate.
As an improvement of the technical scheme, the convex plate is also provided with a third screw hole matched with the second screw.
As an improvement of the technical scheme, a third screw is arranged on the outer side of the third vertical plate, and a fourth screw hole matched with the third screw is further formed in the third vertical plate.
As an improvement of the technical scheme, the cleaning sleeve is in interference fit with the convex plate.
As an improvement of the technical scheme, the bottom of the iron plate is fixedly provided with a magnet.
As an improvement of the technical scheme, a plurality of second through holes are formed in the other side of the second vertical plate, and the second through holes are communicated with the dovetail grooves.
The auxiliary equipment for measuring the foundation static load test has the advantages of simple structure, convenient use, convenient height adjustment of the displacement meter, difficult error generation and good implementation effect, and can conveniently construct the displacement meter even if the depth of a test pit is too deep.
Drawings
FIG. 1 is a schematic diagram of a basic static test measurement device according to the present invention;
FIG. 2 is a schematic view (in plan view) of the basic static test measurement apparatus of the present invention when installed;
FIG. 3 is a schematic diagram of the auxiliary equipment for measuring foundation static test according to the present invention;
FIG. 4 is a schematic view of the first riser and second riser of the present invention when connected;
FIG. 5 is a view A-A of FIG. 4;
FIG. 6 is a schematic view of the structure of the first through hole, the second through hole and the dovetail groove according to the present invention;
FIG. 7 is a schematic view of a first riser according to the present invention;
fig. 8 is a schematic structural view of the cleaning sleeve according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, when the foundation static load test is performed by the foundation static load test measuring equipment, a foundation load board 2 is arranged in a test pit 6, a jack 3 is erected at the central part of the foundation load board 2, then a support pier 51 is erected outside the test pit 6, and a steel beam 5 is erected on the support pier 51; a support 72 for supporting the reference beam 71 is also erected outside the pit 6, and then the reference beam 71 is erected on the support 72; a dowel bar 4 is fixedly arranged on a piston of the jack 3, the upper end of the dowel bar 4 props against the steel beam 5, and an oil pump 31 for driving the jack 3 is placed on the ground.
The basic static load test measuring equipment performs basic static load test steps as follows:
1) And before the test, water-proof and drainage measures are taken around the test pit 6 to prevent the foundation soil water content change or foundation soil disturbance of the test site from influencing the test result.
2) The jack 3 can enable the upper end of the dowel bar 4 to prop against the steel beam 5 in the process of jacking upwards, the foundation load plate 2 receives the reaction force transmitted by the dowel bar 4, the reaction force is the loading force of the foundation load plate 2, and under the action of the loading force, the foundation load plate 2 can be settled; the test loading grade should not be less than 8 grades, and the maximum loading amount should not be less than 2 times of the design requirement bearing capacity characteristic value.
3) After each stage of loading, the settlement amount of the foundation load plate 2 is measured and read once according to the standard corresponding time interval, and the settlement is considered to be stable, and the next stage of load can be added. Four displacement meters 7 can be arranged above the foundation load plate 2, the four displacement meters 7 are symmetrically distributed, and the displacement meters 7 are used for measuring the settlement of the foundation load plate 2.
4) The loading can be terminated when one of the following conditions occurs, and the corresponding previous stage load is set as the limit load when one of the first three conditions is satisfied:
(1) the soil around the foundation load plate 2 is obviously squeezed out sideways;
(2) the settlement amount is increased suddenly, and a steep drop section appears on the pressure-settlement curve;
(3) under a certain level of load, the sedimentation rate in 24 hours cannot reach the stability standard;
(4) the cumulative settlement of the foundation load plate 2 has been greater than 6% of its width or diameter.
As shown in fig. 3-8, the auxiliary device for measuring static load test of foundation comprises an iron disc 11, a first vertical plate 12, a second vertical plate 13, a transverse plate 14, a third vertical plate 15, a plurality of first screws 16 and second screws 17, wherein the first vertical plate 12 is perpendicular to the iron disc 11, the lower end of the first vertical plate 12 is fixedly connected with one side of the iron disc 11, a dovetail groove 131 is arranged on one side of the second vertical plate 13, a bump 121 matched with the dovetail groove 131 is fixedly arranged on one side of the first vertical plate 12, a first screw hole 124 matched with the first screw 16 is further arranged on the first vertical plate 12, a plurality of waist-round first through holes 132 are respectively arranged on two sides of the dovetail groove 131, and the first through holes 132 are communicated with the dovetail groove 131; the upper end of the first vertical plate 12 is fixedly provided with a convex plate 122, the convex plate 122 is arranged in the dovetail groove 131, a cleaning sleeve 18 is sleeved outside the convex plate 122, a brush wire 181 is arranged between the cleaning sleeve 18 and the inner wall of the dovetail groove 131, and the tail end of the brush wire 181 is fixedly connected with the side wall of the cleaning sleeve 18; the side wall of the cleaning sleeve 18 is also provided with a second screw hole 182 matched with the second screw 17, and the upper end of the convex plate 122 is fixedly provided with a triangular convex part 123; the tail end of the transverse plate 14 is fixedly connected with the upper end of the second vertical plate 13, and the upper end of the third vertical plate 15 is fixedly connected with the head end of the transverse plate 14.
The auxiliary equipment for measuring the foundation static load test is used as follows: since the upper ends of the third riser 15, the cross plate 14 and the second riser 13 constitute an n-shaped structure, this enables it to be hung on the reference beam 71; the reference beam 71 is generally made of square tubes which are not easy to roll and deform, so that auxiliary equipment for foundation static load test measurement and the reference beam 71 are firmly fixed; further, a third screw 19 is provided on the outer side of the third riser 15, and a fourth screw hole adapted to the third screw 19 is further provided on the third riser 15; after the third screw 19 is in threaded connection with the fourth screw hole, the end part of the third screw 19 passes through the fourth screw hole and then props against the reference beam 71, so that the space between the third vertical plate 15 and the reference beam 71 is locked by the third screw 19, and the auxiliary equipment for measuring the foundation static load test is prevented from shaking.
Since the projection 121 can slide along the direction defined by the dovetail groove 131, the first riser 12 and the second riser 13 can slide relatively, the height of the iron plate 11 can be adjusted by sliding the first riser 12, and the current displacement meter 7 is usually provided with a magnetic gauge stand, and the magnetic gauge stand can adsorb the iron plate 11 so that the displacement meter 7 is fixed on the iron plate 11, and the height of the displacement meter 7 can be adjusted so as to adapt to test pits 6 with different depths; after the height of the displacement meter 7 is adjusted, the first screw 16 is in threaded connection with the first screw hole 124, and the end part of the first screw 16 passes through the first screw hole 124 and then abuts against the second riser 13, so that the locking and fixing between the first riser 12 and the second riser 13 are completed. The matching of the convex blocks 121 and the dovetail grooves 131 ensures that larger errors are not easy to generate between the second vertical plate 13 and the first vertical plate 12 during sliding, and the measurement errors of the displacement meter 7 are further reduced by taking the reference beam 71 as a reference; even if the depth of the test pit 6 is too deep, the erection operation of the displacement meter 7 is simple and convenient, and the height adjustment operation of the displacement meter 7 is simple and convenient and is not easy to generate errors. Under the action of auxiliary equipment for measuring the foundation static load test, the heights of the displacement meters 7 are adjustable, so that the four displacement meters 7 above the foundation load plate 2 can be positioned on the same horizontal plane, and the system error for measuring the settlement of the foundation load plate 2 is reduced.
Because a large amount of soil exists around the test pit 6, the dovetail groove 131 is easy to be stained with the soil, and in order to ensure that the convex block 121 and the dovetail groove 131 can slide smoothly, the convex block 121 and the dovetail groove 131 are in clearance fit; when the inside of the dovetail groove 131 is stained with soil, although most of the soil can be extruded under the up-and-down movement of the protruding block 121, a small gap exists between the protruding block 121 and the dovetail groove 131, so that the inner wall of the dovetail groove 131 is stained with a small amount of soil, the part of soil is not easy to be removed by the protruding block 121, if the part of soil exists continuously, the sliding of the protruding block 121 is hindered, and even the protruding block 121 or the dovetail groove 131 is worn seriously, so that the combination between the first vertical plate 12 and the second vertical plate 13 is affected, and the first vertical plate 12 is easy to shake.
Since the three side walls of the cleaning sleeve 18 are fixedly provided with the brush wires 181, the head ends of the brush wires 181 are aligned with and propped against the inner wall of the dovetail groove 131, when the first vertical plate 12 slides upwards, the triangular convex parts 123 can break soil in the dovetail groove 131 to break the soil, then most of the soil is swept down by the brush wires 181, and the soil adhered to the two side walls of the dovetail groove 131 is discharged from the first through holes 132 during brushing of the brush wires 181; because the first riser 12 has a limited thickness, the first through-hole 132 is designed in a lumbar shape such that the first through-hole 132 has a sufficiently large area to facilitate the discharging of the earth. Further, a plurality of second through holes 133 are arranged on the other side of the second vertical plate 13, and the second through holes 133 are communicated with the dovetail grooves 131; the soil adhered to the bottom of the dovetail groove 131 is discharged from the second through hole 133 during brushing of the brush wire 181; the lower end of the protruding block 121 may be extended to the lower end of the first riser 12, which allows the lower half of the dovetail groove 131 to be always occupied by the protruding block 121, and only the upper half of the dovetail groove 131 needs to be cleaned. Under the cleaning of the brush wire 181 on the cleaning sleeve 18, the interior of the dovetail groove 131 is not easy to be adhered with soil, and even if the interior is adhered with soil, the interior is easy to be cleaned, and the operation is simple and convenient. After the cleaning sleeve 18 is sleeved outside the convex plate 122, the second screw 17 is in threaded connection with the second screw hole 182, and the end part of the second screw 17 passes through the second screw hole 182 and then abuts against the convex plate 122, so that the fixing between the cleaning sleeve 18 and the convex plate 122 is completed; further, the boss 122 is further provided with a third screw hole 1221 adapted to the second screw 17, and when the end of the second screw 17 passes through the second screw hole 182, the end of the second screw 17 may be further screwed with the third screw hole 1221, which makes the fixation between the cleaning sleeve 18 and the boss 122 more stable. Further, the cleaning sleeve 18 and the convex plate 122 are in interference fit, so that soil is not easy to penetrate between the cleaning sleeve 18 and the convex plate 122; even though the cleaning sleeve 18 is in an interference fit with the boss 122, the presence of the triangular protrusions 123 allows the cleaning sleeve 18 to be smoothly fitted over the outside of the boss 122. The mounting and dismounting operations between the cleaning sleeve 18 and the convex plate 122 are simple and convenient; the cleaning sleeve 18 can be detached from the convex plate 122, then the second screw 17 is in threaded connection with the second screw hole 182, so that the end part of the second screw 17 passes through the second screw hole 182 and abuts against the inner wall of the cleaning sleeve 18, then the convex block 121 is separated from the dovetail groove 131, finally the brush wire 181 on the cleaning sleeve 18 is aligned with the dovetail groove 131, the dovetail groove 131 can be further scrubbed under the cleaning of tap water, and further cleaning and cleaning of the dovetail groove 131 are completed.
Further, a magnet 110 is fixedly arranged at the bottom of the iron plate 11; although most of the displacement meters 7 are provided with magnetic meter seats at present, there are displacement meters 7 without magnetic meter seats, and when the displacement meters 7 are placed on the iron disc 11, as the outer shell of the displacement meters 7 is usually made of an iron shell, the displacement meters 7 can be adsorbed on the iron disc 11 under the adsorption of the magnet 110, so that the combination between the displacement meters 7 and the iron disc 11 is firmer, and the expansion of measurement errors caused by the accidental movement of the displacement meters 7 is avoided.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. Auxiliary equipment for foundation base static load test measurement, its characterized in that: including iron plate (11), first riser (12), second riser (13), diaphragm (14), third riser (15), a plurality of first screw (16), second screw (17), first riser (12) are mutually perpendicular with iron plate (11), the lower extreme of first riser (12) is fixedly connected with one side of iron plate (11), one side of second riser (13) is provided with dovetail (131), one side of first riser (12) has set firmly lug (121) with dovetail (131) matched with, still be provided with first screw (124) with first screw (16) looks adaptation on first riser (12), the both sides of dovetail (131) are provided with a plurality of waist circular first through-holes (132) respectively, first through-hole (132) communicate with dovetail (131). The upper end of the first vertical plate (12) is fixedly provided with a convex plate (122), the convex plate (122) is arranged in the dovetail groove (131), a cleaning sleeve (18) is sleeved outside the convex plate (122), a brush wire (181) is arranged between the cleaning sleeve (18) and the inner wall of the dovetail groove (131), and the tail end of the brush wire (181) is fixedly connected with the side wall of the cleaning sleeve (18); the side wall of the cleaning sleeve (18) is also provided with a second screw hole (182) matched with the second screw (17), and the upper end of the convex plate (122) is fixedly provided with a triangular convex part (123); the tail end of the transverse plate (14) is fixedly connected with the upper end of the second vertical plate (13), and the upper end of the third vertical plate (15) is fixedly connected with the head end of the transverse plate (14);
a third screw (19) is arranged on the outer side of the third vertical plate (15), and a fourth screw hole matched with the third screw (19) is also formed in the third vertical plate (15);
a magnet (110) is fixedly arranged at the bottom of the iron disc (11);
the other side of the second vertical plate (13) is provided with a plurality of second through holes (133), and the second through holes (133) are communicated with the dovetail grooves (131).
2. The auxiliary device for foundation static test measurement according to claim 1, wherein: the convex plate (122) is also provided with a third screw hole (1221) matched with the second screw (17).
3. The auxiliary device for foundation static test measurement according to claim 1, wherein: the cleaning sleeve (18) is in interference fit with the convex plate (122).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810086546.1A CN108035389B (en) | 2018-01-30 | 2018-01-30 | Auxiliary equipment for measuring static load test of foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810086546.1A CN108035389B (en) | 2018-01-30 | 2018-01-30 | Auxiliary equipment for measuring static load test of foundation |
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| Publication Number | Publication Date |
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| CN108035389A CN108035389A (en) | 2018-05-15 |
| CN108035389B true CN108035389B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810086546.1A Active CN108035389B (en) | 2018-01-30 | 2018-01-30 | Auxiliary equipment for measuring static load test of foundation |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014088689A (en) * | 2012-10-30 | 2014-05-15 | Ssc Pile Association | Loading test method and loading test device for composite reinforcement ground |
| CN207812522U (en) * | 2018-01-30 | 2018-09-04 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | A kind of foundation static test measurement ancillary equipment |
-
2018
- 2018-01-30 CN CN201810086546.1A patent/CN108035389B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014088689A (en) * | 2012-10-30 | 2014-05-15 | Ssc Pile Association | Loading test method and loading test device for composite reinforcement ground |
| CN207812522U (en) * | 2018-01-30 | 2018-09-04 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | A kind of foundation static test measurement ancillary equipment |
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| CN108035389A (en) | 2018-05-15 |
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