CN109944281B - Load box and measuring method thereof - Google Patents
Load box and measuring method thereof Download PDFInfo
- Publication number
- CN109944281B CN109944281B CN201910219678.1A CN201910219678A CN109944281B CN 109944281 B CN109944281 B CN 109944281B CN 201910219678 A CN201910219678 A CN 201910219678A CN 109944281 B CN109944281 B CN 109944281B
- Authority
- CN
- China
- Prior art keywords
- load box
- cylinder
- oil
- displacement
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000006073 displacement reaction Methods 0.000 claims abstract description 141
- 238000002474 experimental method Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000005086 pumping Methods 0.000 claims description 11
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 18
- 238000013461 design Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 109
- 238000001514 detection method Methods 0.000 description 9
- 239000010720 hydraulic oil Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Abstract
The invention discloses a load box and a measuring method thereof, belonging to the field of tubular pile self-balancing experiment devices. The invention meets the requirement of large enough load box output value, and the structural design does not influence the measurement of displacement, can meet the development of the self-balancing experiment of the existing small-diameter tubular pile, has good stress balance in the measurement process, and the displacement rod under the load box moves along with the bottom plate of the jack piston without adopting the structure of an annular jack, thereby effectively detecting the lower displacement of the load box. Meanwhile, for the problem of smaller diameter of the pipe pile, the load box can be designed by adopting a single jack, and the piston has larger hydraulic contact area and can ensure larger output in a lower oil pressure range.
Description
Technical Field
The invention relates to the field of tubular pile self-balancing experiment devices, in particular to a load box and a measuring method thereof.
Background
Along with the wide use of the concrete prestressed pipe pile, the pipe pile is tested by adopting a self-balancing method, however, the diameter of the pipe pile is generally 300-800 mm, the diameter of a single jack for a load box on the market at present is 100-800 mm, and the traditional load box design adopts a hollow connection mode of a plurality of jacks, but is limited by space arrangement and can not be developed in the pipe pile. Meanwhile, the design of the load box for the self-balancing detection of the tubular pile is still defective, so the design of the load box which can be used for loading and accurately measuring displacement is a key point of the application of the self-balancing method pile measurement in the detection of the tubular pile.
To arrange the load box for self-balancing detection in the pile body, two conditions need to be satisfied: (1) a sufficiently large load box output value is satisfied. And (2) the structural design of the load box does not influence the measurement of displacement. For the existing load box patent for detecting the tubular pile, the hollow connecting structure form or the annular jack structure form is arranged by multiple jacks. However, the tubular pile has a smaller diameter, and has a great defect due to the adoption of a hollowed-out or middle opening design: (1) The diameter of the tubular pile is smaller, the diameter of a single jack is larger, a plurality of jacks are required to be arranged for hollow connection under the condition of meeting the ejection force of the jacks, and the plurality of jacks are difficult to arrange in the limited space of the tubular pile. (2) The hydraulic area of the piston of the annular jack is smaller for a single jack, the required oil pump output pressure is higher to achieve the same output force, the oil pressure peak value reaches 40-50 Mpa when the load box is output at present, the hydraulic pressure peak value belongs to the category of ultrahigh pressure, if the annular jack is adopted, the oil contact area of the bottom surface of the inner piston is smaller, the higher oil pressure is required when the detection process needs to achieve the same output force, the failure rate of the self-balancing detection test is greatly increased due to the higher oil pressure, meanwhile, the requirement on the pressurizing equipment is higher, and the detection process is quite dangerous. (3) The single large-diameter jack load box is used for detection, the hollow pipeline in the pipe pile is filled up due to the fact that the single jack is in a solid form, the lower displacement of the load box cannot be effectively detected, and the load box cannot be applied to the self-balancing pile measurement of the pipe pile due to the fact that the single large-diameter jack is adopted.
Disclosure of Invention
The invention aims to provide a load box and a measuring method thereof, which are used for solving the technical problems in the background technology.
The utility model provides a load case, includes upper plate, stiffening plate, hypoplastron, lower displacement pole, goes up displacement pole, load case hydro-cylinder outer cylinder and load case hydro-cylinder inner plug, load case hydro-cylinder inner plug sets up on the hypoplastron, load case hydro-cylinder outer cylinder sleeve is established on load case hydro-cylinder inner plug upper end, and is provided with the oil pocket between load case hydro-cylinder outer cylinder and the load case hydro-cylinder inner plug, the stiffening plate sets up the side at load case hydro-cylinder outer cylinder, the upper plate sets up the top at load case hydro-cylinder outer cylinder, the stiffening plate is connected with upper plate or hypoplastron, lower displacement pole runs through upper plate and load case hydro-cylinder outer cylinder and is connected with the top of load case hydro-cylinder inner plug, it is connected with the top of load case hydro-cylinder outer cylinder that goes up the displacement pole runs through the upper plate.
Further, a lower displacement rod oil seal is arranged at the position of the lower displacement rod penetrating through the outer cylinder of the load box oil cylinder, and the lower displacement rod oil seal is in contact and seal arrangement with the lower displacement rod.
Further, an upper plate mounting hole is formed in the upper plate, an oil cylinder top fixing mounting hole is formed in the top of the outer cylinder of the load box oil cylinder, and the upper plate passes through the upper plate mounting hole and the oil cylinder top fixing mounting hole through bolts and screws to fixedly connect the upper plate with the outer cylinder of the load box oil cylinder.
Further, the bottom of the inner plug of the load box oil cylinder is provided with an oil cylinder bottom fixing hole, the lower plate is provided with a lower plate fixing mounting hole, and the inner plug of the load box oil cylinder and the lower plate penetrate through the oil cylinder bottom fixing hole and the lower plate fixing mounting hole through bolts and screws to be fixedly connected.
Further, a load box oil cylinder inner plug oil seal is arranged between the load box oil cylinder inner plug and the side wall of the load box oil cylinder outer cylinder and used for sealing the oil cavity.
Further, a direction stopping ring is arranged between the bottom of the outer cylinder of the load box cylinder and the side wall of the inner plug of the load box cylinder, and an O-shaped ring is arranged between the direction stopping ring and the side edge of the inner plug of the load box cylinder.
Further, an oil filling hole is formed in the top of the outer cylinder of the load box oil cylinder, an oil cylinder hydraulic oil inlet hole is reserved in a top plate of the outer cylinder of the load box oil cylinder, an upper plate oil pipe reserved hole is formed in the upper plate, and the oil filling hole, the oil cylinder hydraulic oil inlet hole and the upper plate oil pipe reserved hole are arranged on the same straight line.
Further, the lower displacement rod and the upper displacement rod are two, the top of the outer cylinder of the load box cylinder is provided with a cylinder lower displacement rod hole, the upper plate is provided with an upper plate lower displacement preformed hole and an upper plate upper displacement rod preformed hole, the cylinder lower displacement rod hole and the upper plate lower displacement preformed hole are arranged on the same straight line, the lower displacement rod penetrates through the cylinder lower displacement rod hole and the upper plate lower displacement preformed hole, and the upper displacement rod penetrates through the upper plate upper displacement rod preformed hole.
Further, a filling cavity is arranged in the inner plug of the load box oil cylinder, and cement is filled in the filling cavity.
A method of measuring a load cell, the method comprising the steps of:
step 1: the load box is arranged on the lower section pile, the lower plate is fixed with the lower section pile, and a lower uniform force plate is arranged between the lower plate and the lower section pile;
step 2: the upper section pile is arranged at the top of the load box in a falling way, the upper plate is fixed with the upper section pile, and an upper uniform force plate is arranged between the upper plate and the upper section pile;
step 3: steel wires are transmitted from the middle hollow position of the upper section pile, and each steel wire is respectively connected with the lower displacement rod and the upper displacement rod;
step 4: marking all initial positions of the steel wires, wherein the initial positions of the steel wires are the positions where the steel wires are leveled with the top of the pile at the upper section, and pumping oil to an oil cavity through an oil filling hole by an oil pump;
step 5: when pumping oil, the lower pile is subjected to downward displacement by the pressure of the inner plug of the load box oil cylinder, the upper pile is subjected to upward displacement by the upward thrust of the outer cylinder of the load box oil cylinder, a self-balancing experiment adopts a method of measuring pile body displacement by graded pressurization, after the pumping oil is subjected to one-stage pressure, pressure maintaining is carried out for a set time, and the displacement of steel wires after each-stage pressurization, namely the displacement values of the upper pile and the lower pile, are measured by a micrometer;
step 6: after the displacement wire is led into the ground through the hole in the tubular pile, a weight with specified weight is hung at the end part of the displacement wire after penetrating through the pulley block on the fixing frame, so that the displacement wire keeps a straightened state, and then the displacement of the hung weight is measured by adopting a micrometer, and the displacement of the hung weight is the displacement of the displacement wire, namely the displacement of the pile body.
The invention adopts the technical proposal and has the following technical effects:
the invention meets the requirement of large enough load box output value, and the structural design does not influence the measurement of displacement, so that the small diameter measurement of the existing tubular pile can be met, and meanwhile, the requirement of good stress balance is met in the measurement process, the detection of the displacement under the load box follows the movement of the bottom plate of the jack piston, the structure of an annular jack is not needed, and the displacement under the load box is effectively detected. Meanwhile, for the problem of smaller diameter of the pipe pile, the load box can be designed by adopting a single jack, and the piston has larger hydraulic contact area and can ensure larger output in a lower oil pressure range.
Drawings
Figure 1 is a cross-sectional view of a load box of the present invention.
FIG. 2 is a cross-sectional view of the load box cylinder of the present invention.
Fig. 3 is a top plan view of the load box cylinder of the present invention.
Fig. 4 is a plan view of the bottom of the load box cylinder of the present invention.
Fig. 5 is a plan view of the top plate of the load box of the present invention.
Fig. 6 is a plan view of the lower plate of the load box of the present invention.
Fig. 7 is a schematic view of the load box mounting structure of the present invention.
Reference numerals in the drawings: 1. an upper plate; 2. stiffening plates; 3. a lower plate; 4. a lower displacement rod; 5. a lower displacement rod oil seal; 6. an oil filling hole; 7. an outer cylinder of the load box cylinder; 8. an oil chamber; 9. the oil seal is plugged in the oil cylinder of the load box; 10. a load box cylinder inner plug; 11. filling the cavity; 12. a stop ring; 13. an O-ring; 14. a hydraulic oil inlet hole of the oil cylinder; 15. the top of the oil cylinder is fixedly provided with a mounting hole; 16. a lower displacement rod hole of the oil cylinder; 17. a fixed hole at the bottom of the oil cylinder; 18. preformed holes of the upper plate oil pipe; 19. the upper plate is displaced downwards to reserve a hole; 20. an upper plate mounting hole; 21. a displacement rod preformed hole is formed in the upper plate; 22. the lower plate is fixedly provided with a mounting hole; 23. a lower pile section; 24. and (5) upper pile section.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
Referring to fig. 1, the invention provides a load box, which comprises an upper plate 1, a stiffening plate 2, a lower plate 3, a lower displacement rod 4, an upper displacement rod (marked in the figure), a load box cylinder outer cylinder 7 and a load box cylinder inner plug 10, wherein the load box cylinder inner plug 10 is arranged on the lower plate 3, the load box cylinder outer cylinder 7 is sleeved at the upper end of the load box cylinder inner plug 10, an oil cavity 8 is arranged between the load box cylinder outer cylinder 7 and the load box cylinder inner plug 10, the stiffening plate 2 is arranged on the side edge of the load box cylinder outer cylinder 7, the upper plate 1 is arranged at the top end of the load box cylinder outer cylinder 7, the stiffening plate 2 is connected with the upper plate 1 or the lower plate 3, the lower displacement rod 4 penetrates through the upper plate 1 and the load box cylinder outer cylinder 7 to be connected with the top of the load box cylinder inner plug 10, and the upper displacement rod penetrates through the upper plate 1 to be connected with the top of the load box cylinder outer cylinder 7.
The lower displacement rod 4 is used for being connected with the load box oil cylinder inner plug 10, when oil is pumped, the load box oil cylinder inner plug 10 is pressed downwards, so that the lower section pile 23 is displaced downwards, and the distance of the downward movement of the lower displacement rod 4 relative to the original horizontal position without oil pumping is the distance of the downward displacement of the lower section pile 23. The upper displacement rod moves upwards along with the upper section pile 24 pushed upwards by the outer cylinder 7 of the load box cylinder, and the horizontal position of the upper displacement rod relative to the original oil pumping is the distance of the upper section pile 24 moving upwards.
In the embodiment of the invention, a lower displacement rod oil seal 5 is arranged at the position of the lower displacement rod 4 penetrating through the outer cylinder 7 of the load box oil cylinder, and the lower displacement rod oil seal 5 is in contact and seal arrangement with the lower displacement rod 4. The lower displacement rod oil seal 5 prevents oil from flowing out from the edge of the lower displacement rod 4 when pumping oil, thereby making the oil pressure lower, so that the oil pressure measurement as needed is more accurate.
In the embodiment of the invention, an upper plate mounting hole 20 is formed in the upper plate 1, an oil cylinder top fixing mounting hole 15 is formed in the top of the load box oil cylinder outer cylinder 7, and the upper plate 1 is fixedly connected with the load box oil cylinder outer cylinder 7 through bolts and screws passing through the upper plate mounting hole 20 and the oil cylinder top fixing mounting hole 15. The upper plate mounting hole 20 and the cylinder top fixing mounting hole 15 are mainly used for further fixing the upper plate 1 and the load box cylinder outer cylinder 7, so that side movement cannot occur during pressurization, and measurement is more accurate.
In the embodiment of the invention, an oil cylinder bottom fixing hole 17 is formed in the bottom of the load box oil cylinder inner plug 10, a lower plate fixing and mounting hole 22 is formed in the lower plate 3, and the load box oil cylinder inner plug 10 and the lower plate (3) are fixedly connected through the oil cylinder bottom fixing hole 17 and the lower plate fixing and mounting hole 22 through bolts and screws. The cylinder bottom fixing holes 17 and the lower plate fixing and mounting holes 22 are used for further fixing the lower plate 3 and the load box cylinder inner plug 10, so that side movement cannot occur during pressurization, and measurement is more accurate.
In the embodiment of the invention, a load box oil cylinder inner plug oil seal 9 is arranged between the load box oil cylinder inner plug 10 and the side wall of the load box oil cylinder outer cylinder 7 and is used for sealing the oil cavity 8. The load box oil cylinder inner plug oil seal 9 is further used for sealing the load box oil cylinder inner plug 10 and the load box oil cylinder outer cylinder 7, and the load box oil cylinder inner plug 10 and the load box oil cylinder outer cylinder 7 are movably arranged, so that oil in the oil cavity 8 is required to be sealed, the sealing effect is better, and the oil leakage is prevented.
In the embodiment of the invention, a direction stopping ring 12 is arranged between the bottom of the load box cylinder outer cylinder 7 and the side wall of the load box cylinder inner plug 10, and an O-shaped ring is arranged between the direction stopping ring 12 and the side edge of the load box cylinder inner plug 10. The bottom side edge of the outer cylinder 7 of the load box cylinder and the side wall of the inner plug 10 of the load box cylinder are sealed under the condition that the check ring 12 and the O-shaped ring are further prevented from leaking oil.
In the embodiment of the invention, an oil filling hole 6 is formed in the top of the load box oil cylinder outer cylinder 7, an oil cylinder hydraulic oil inlet hole 14 is reserved on a top plate of the load box oil cylinder outer cylinder 7, an upper plate oil pipe reserved hole 18 is formed in the upper plate 1, and the oil filling hole 6, the oil cylinder hydraulic oil inlet hole 14 and the upper plate oil pipe reserved hole 18 are arranged on the same straight line. The oil filling hole 6 is generally provided with an oil filling pipe in advance during installation and measurement, so that the later oil filling is more convenient and quick.
In the embodiment of the invention, the number of the lower displacement rods 4 and the upper displacement rods is two, the top of the outer cylinder 7 of the load box is provided with an oil cylinder lower displacement rod hole 16, the upper plate 1 is provided with an upper plate lower displacement preformed hole 19 and an upper plate upper displacement rod preformed hole 21, the oil cylinder lower displacement rod hole 16 and the upper plate lower displacement preformed hole 19 are arranged on the same straight line, the lower displacement rod 4 passes through the oil cylinder lower displacement rod hole 16 and the upper plate lower displacement preformed hole 19, and the upper displacement rod passes through the upper plate upper displacement rod preformed hole 21. The lower displacement rod 4 and the upper displacement rod are two, so that the measured result is subjected to zone average value, the measurement is more accurate, and the problem that the measurement is inaccurate due to sideslip or uneven stress is prevented.
In the embodiment of the invention, a filling cavity 11 is arranged in the load box cylinder inner plug 10, and cement is filled in the filling cavity 11. Filling the filling cavity 11 with cement further improves the supporting force of the load box cylinder inner plug 10, while reducing the cost.
A method of measuring a load cell, the method comprising the steps of:
the load box is arranged on the lower section pile 23, the lower plate 3 is fixed with the lower section pile 23, and a lower uniform force plate is arranged between the lower plate 3 and the lower section pile 23. The lower plate 3, lower pile 23 and lower force equalizing plate are generally made of metal materials.
The upper section pile 24 is arranged on the top of the load box, the upper plate 1 is fixed with the upper section pile 24, and an upper uniform force plate is arranged between the upper plate 1 and the upper section pile 24. The upper plate 1 is generally smaller or as large as the upper pile 24, but larger than the inner hollow of the upper pile 24, so that even stress is better performed.
Steel wires are fed from the middle hollow position of the upper pile 24, and each steel wire is connected with the lower displacement rod 4 and the upper displacement rod respectively. The number of steel wires was 4, and the use of steel wires caused a structure that affected the measurement due to deformation.
All the initial positions of the steel wires are marked, wherein the initial positions of the steel wires are the positions where the steel wires are leveled with the top of the upper section pile 24, and then oil is pumped to the oil cavity 8 through the oil filling hole 6 by the oil pump. The marking is generally performed by using a color pen, and the steel wire and the upper pile 24 are always in parallel positions during marking, so that the marking is more accurate.
When pumping oil, the lower pile 23 is subjected to downward displacement by the pressure of the inner plug 10 of the load box cylinder, the upper pile 24 is subjected to upward displacement by the upward thrust of the outer cylinder 7 of the load box cylinder, the self-balancing experiment adopts a method of measuring the displacement of the pile body by graded pressurization for pile test, after the pumping oil is subjected to one-stage pressure, pressure maintaining is carried out for a set time, and the displacement of steel wires after each-stage pressurization, namely the displacement value of the upper pile 24 and the lower pile 23, is measured by a micrometer.
After the displacement wire is led into the ground through the hole in the tubular pile, the pulley block on the fixing frame is penetrated, and then the weight with specified weight is hung at the end part of the displacement wire, so that the displacement wire keeps a straightened state, and then the displacement of the hung weight is measured by adopting a micrometer, and the displacement of the hung weight is the displacement of the pile body. The displacement is monitored in real time, and the displacement is measured after each stage is added for a certain time. Through displacement about real-time measurement for better solve the problem of the displacement of current load case unable measurement hypomere stake, had fine production practical application.
And (3) measuring the following displacement: the lower displacement rod penetrates through the lower displacement rod hole in the bottom plate and is connected with the ground surface of the piston through the oil cylinder, the connection is fixed by adopting screw threads, and the displacement of the load box is measured by measuring the bottom surface displacement of the piston. The following displacement measurement mode: and the upper end of the lower displacement rod is provided with a hole, a displacement wire passes through the hole at the upper end and is connected to the displacement rod, and then the displacement wire is led to the ground through a hole in the middle of the tubular pile, and the displacement measurement is carried out by using an electronic dial indicator.
The detection of displacement under the load case follows the bottom plate removal of jack piston, need not to adopt the structure of annular jack, effectively detects the displacement under the load case. Meanwhile, for the problem of smaller diameter of the pipe pile, the load box can be designed by adopting a single jack, and the piston has larger hydraulic contact area and can ensure larger output in a lower oil pressure range.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The load box is characterized by comprising an upper plate (1), a stiffening plate (2), a lower plate (3), a lower displacement rod (4), an upper displacement rod, a load box cylinder outer cylinder (7) and a load box cylinder inner plug (10), wherein the load box cylinder inner plug (10) is arranged on the lower plate (3), the load box cylinder outer cylinder (7) is sleeved at the upper end of the load box cylinder inner plug (10), an oil cavity (8) is arranged between the load box cylinder outer cylinder (7) and the load box cylinder inner plug (10), the stiffening plate (2) is arranged on the side edge of the load box cylinder outer cylinder (7), the upper plate (1) is arranged at the top end of the load box cylinder outer cylinder (7), the stiffening plate (2) is connected with the upper plate (1) or the lower plate (3), the lower displacement rod (4) penetrates through the upper plate (1) and the load box cylinder outer cylinder (7) to be connected with the top of the load box cylinder inner plug (10), and the stiffening plate (2) penetrates through the top of the upper plate (1) to be connected with the top of the load box cylinder outer cylinder (7);
the lower displacement rod (4) penetrates through an outer cylinder (7) of the load box oil cylinder, a lower displacement rod oil seal (5) is arranged at the position, in contact and seal with the lower displacement rod (4), of the lower displacement rod oil seal (5);
an upper plate mounting hole (20) is formed in the upper plate (1), an oil cylinder top fixing mounting hole (15) is formed in the top of the load box oil cylinder outer cylinder (7), and the upper plate (1) is fixedly connected with the load box oil cylinder outer cylinder (7) through bolts and screws penetrating through the upper plate mounting hole (20) and the oil cylinder top fixing mounting hole (15);
the bottom of the load box oil cylinder inner plug (10) is provided with an oil cylinder bottom fixing hole (17), the lower plate (3) is provided with a lower plate fixing and mounting hole (22), and the load box oil cylinder inner plug (10) and the lower plate (3) are fixedly connected with the lower plate fixing and mounting hole (22) through bolts and screws penetrating through the oil cylinder bottom fixing hole (17);
the lower displacement rod (4) and the upper displacement rod are two, an oil cylinder lower displacement rod hole (16) is formed in the top of an oil cylinder outer cylinder (7) of the load box, an upper plate lower displacement preformed hole (19) and an upper plate upper displacement rod preformed hole (21) are formed in the upper plate (1), the oil cylinder lower displacement rod hole (16) and the upper plate lower displacement preformed hole (19) are formed in the same straight line, the lower displacement rod (4) penetrates through the oil cylinder lower displacement rod hole (16) and the upper plate lower displacement preformed hole (19), and the upper displacement rod penetrates through the upper plate upper displacement rod preformed hole (21).
2. A load box according to claim 1, wherein: and a load box oil cylinder inner plug oil seal (9) is arranged between the load box oil cylinder inner plug (10) and the side wall of the load box oil cylinder outer cylinder (7) and is used for sealing the oil cavity (8).
3. A load box according to claim 1, wherein: a direction stopping ring (12) is arranged between the bottom of the load box cylinder outer cylinder (7) and the side wall of the load box cylinder inner plug (10), and an O-shaped ring is arranged between the direction stopping ring (12) and the side edge of the load box cylinder inner plug (10).
4. A load box according to claim 1, wherein: the top of load case hydro-cylinder outer cylinder (7) is provided with oil filler point (6), reserve hydro-cylinder hydraulic feed hole (14) on the top board of load case hydro-cylinder outer cylinder (7), be provided with upper plate oil pipe preformed hole (18) on upper plate (1), oil filler point (6), hydro-cylinder hydraulic feed hole (14) and upper plate oil pipe preformed hole (18) set up on same straight line.
5. A load box according to claim 1, wherein: a filling cavity (11) is arranged in the load box oil cylinder inner plug (10), and cement is filled in the filling cavity (11).
6. A method of measuring a load cell according to any one of claims 1-5, characterized in that: the measuring method comprises the following steps:
step 1: the load box is arranged on the lower section pile (23), the lower plate (3) is fixed with the lower section pile (23), and a lower uniform force plate is arranged between the lower plate (3) and the lower section pile (23);
step 2: the upper section pile (24) is arranged at the top of the load box, the upper plate (1) is fixed with the upper section pile (24), and an upper uniform force plate is arranged between the upper plate (1) and the upper section pile (24);
step 3: steel wires are transmitted from the middle hollow position of the upper section pile (24), and each steel wire is respectively connected with the lower displacement rod (4) and the upper displacement rod;
step 4: marking all initial positions of the steel wires, wherein the initial positions of the steel wires are the positions where the steel wires are leveled with the top of the upper section pile (24), and pumping oil to the oil cavity (8) through the oil filling hole (6) by an oil pump;
step 5: when pumping oil, the lower section pile (23) is subjected to downward displacement by the pressure of the inner plug (10) of the load box oil cylinder, the upper section pile (24) is subjected to upward displacement by the upward thrust of the outer cylinder (7) of the load box oil cylinder, the self-balancing experiment adopts a method of measuring pile body displacement by graded pressurization, pressure maintaining is carried out for a set time after the oil pumping is finished at each stage of pressure, and the displacement of steel wires after each stage of pressurization, namely the displacement values of the upper section pile (24) and the lower section pile (23), are measured by a micrometer;
step 6: after the displacement wire is led into the ground through the hole in the tubular pile, a weight with specified weight is hung at the end part of the displacement wire after penetrating through the pulley block on the fixing frame, so that the displacement wire keeps a straightened state, and then the displacement of the hung weight is measured by adopting a micrometer, and the displacement of the hung weight is the displacement of the displacement wire, namely the displacement of the pile body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910219678.1A CN109944281B (en) | 2019-03-22 | 2019-03-22 | Load box and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910219678.1A CN109944281B (en) | 2019-03-22 | 2019-03-22 | Load box and measuring method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109944281A CN109944281A (en) | 2019-06-28 |
| CN109944281B true CN109944281B (en) | 2023-11-10 |
Family
ID=67011260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910219678.1A Active CN109944281B (en) | 2019-03-22 | 2019-03-22 | Load box and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109944281B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284536A (en) * | 2019-08-04 | 2019-09-27 | 浙江欧感机械制造有限公司 | For detecting the load box structure that can load box normally be opened in autobalanced detection |
| CN110453733B (en) * | 2019-09-18 | 2023-12-29 | 国网安徽省电力有限公司建设分公司 | Pile foundation bearing capacity self-balancing test device and test method in model test |
| CN113373992A (en) * | 2021-06-23 | 2021-09-10 | 唐春梅 | Roadbed settlement test platform for road and bridge transition section |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800816A (en) * | 2006-01-11 | 2006-07-12 | 孔清华 | Self-balancing static load measuring method for pile |
| CN104674859A (en) * | 2015-02-13 | 2015-06-03 | 广西瑞宇建筑科技有限公司 | Large-diameter pile self-reaction force detection device convenient for pouring concrete |
| KR20170019395A (en) * | 2017-02-13 | 2017-02-21 | (주)백경지앤씨 | Improved Bi-Directional for Pile Load Test Apparatus and thereof Method |
| CN206888033U (en) * | 2017-06-01 | 2018-01-16 | 浙江欧感机械制造有限公司 | Pile foundation self-balancing approach stake bottom load box |
-
2019
- 2019-03-22 CN CN201910219678.1A patent/CN109944281B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800816A (en) * | 2006-01-11 | 2006-07-12 | 孔清华 | Self-balancing static load measuring method for pile |
| CN104674859A (en) * | 2015-02-13 | 2015-06-03 | 广西瑞宇建筑科技有限公司 | Large-diameter pile self-reaction force detection device convenient for pouring concrete |
| KR20170019395A (en) * | 2017-02-13 | 2017-02-21 | (주)백경지앤씨 | Improved Bi-Directional for Pile Load Test Apparatus and thereof Method |
| CN206888033U (en) * | 2017-06-01 | 2018-01-16 | 浙江欧感机械制造有限公司 | Pile foundation self-balancing approach stake bottom load box |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109944281A (en) | 2019-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109944281B (en) | Load box and measuring method thereof | |
| CN106546366B (en) | A kind of umbellate form deep hole three-dimensional stress and displacement comprehensive test device | |
| CN101122552B (en) | Reservoir casing perforation anti-crushing simulation test method and simulation test machine | |
| CN108005131B (en) | Real-time monitoring system and monitoring method for deformation of underground building enclosure structure | |
| CN204590104U (en) | A kind of bath scaled model experimental device of simulating self-balance testing pile method | |
| CN206339329U (en) | Volume range force sensor calibrating installation | |
| CN108732043B (en) | Deep rock mass creep impact test device capable of simulating impact disturbance | |
| CN101113674A (en) | Drilling stress meter for one-hole multiple measuring points | |
| CN112782239A (en) | Intelligent grouting sleeve and saturation and damage position detection device and method thereof | |
| CN111735573A (en) | Oil gas well casing reliability evaluation device | |
| CN214277982U (en) | Intelligent grouting sleeve and saturation and damage position detection device thereof | |
| CN101813575A (en) | Bending resistance test device for valve | |
| CN209923998U (en) | Load box | |
| CN110095236B (en) | Packer packing element sealing performance testing arrangement | |
| CN207647216U (en) | A kind of chute type lateral limiting device for building jacking | |
| CN108225143B (en) | Automatic measuring device and method for taper thread parameters of graphite electrode connector | |
| CN106769493B (en) | Pseudo triaxial testing device based on dynamic fatigue testing machine | |
| CN113916647B (en) | Rock fracture shear seepage coupling test device and test method thereof | |
| CN205954722U (en) | Spiral ground stake counterforce device | |
| CN220288591U (en) | Automatic detection mechanism for axial clearance of bearing | |
| CN210829228U (en) | Well head calibration metering vehicle connecting device | |
| CN212248410U (en) | Overall waterproof performance detection and calibration device for foundation pile self-balancing bearing capacity load box | |
| CN115452572B (en) | Test device and method for testing neutral axis position and longitudinal equivalent bending stiffness of shield tunnel | |
| CN220013802U (en) | Load box for pile foundation self-balancing detection | |
| CN202661335U (en) | Single-shaft creep testing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |