CN215801843U - Foundation pile displacement measurement device based on non-contact displacement measurement instrument - Google Patents
Foundation pile displacement measurement device based on non-contact displacement measurement instrument Download PDFInfo
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- CN215801843U CN215801843U CN202121337111.3U CN202121337111U CN215801843U CN 215801843 U CN215801843 U CN 215801843U CN 202121337111 U CN202121337111 U CN 202121337111U CN 215801843 U CN215801843 U CN 215801843U
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- foundation pile
- displacement
- displacement measuring
- movable ring
- open caisson
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Abstract
The utility model discloses a foundation pile displacement measuring device based on a non-contact displacement measuring instrument, which comprises a cylindrical concrete open caisson arranged right above a foundation pile, wherein a loading device capable of freely lifting the concrete open caisson in the vertical direction is arranged below the concrete open caisson, a displacement rod is vertically arranged at the upper end of the foundation pile, a counter-force beam is arranged on the concrete open caisson, the displacement rod comprises an inner rod and a movable ring sleeved on the periphery of the inner rod, a waveguide tube made of magnetostrictive materials is arranged in the inner rod along the length direction of the inner rod, the movable ring is an annular magnet, the bottom end of the inner rod is fixedly connected to the upper surface of the foundation pile, the inner diameter of the movable ring is larger than the outer diameter of the inner rod, the movable ring is connected above the counter-force beam through a screw, and moves up and down along with the concrete open caisson relative to the inner rod. The utility model uses a specially-made displacement rod to carry out foundation pile displacement test through the non-contact multipoint displacement measuring instrument, thereby realizing the remote measurement of the foundation pile displacement in the static load detection test process of the foundation pile.
Description
Technical Field
The utility model relates to the technical field of civil engineering foundation pile detection, in particular to a foundation pile displacement measuring device based on a non-contact displacement measuring instrument.
Background
The existing foundation pile static load test method mainly comprises a pile loading method, an anti-anchor method and a self-balancing method. The self-balancing method is a novel foundation pile static load test method, and the principle is that the weight of a foundation pile and the frictional resistance of the soil around the pile above a pile neutral point are utilized to provide load, and an oil pressure loading device is placed into the pile and poured together with the foundation pile before the foundation pile is poured. In the process of the foundation pile static load detection test, the displacement value of the foundation pile under different loads needs to be measured.
For example patent CN 111855426A-a vertical resistance to compression static test device of engineering stake, including the concrete open caisson that is the cylinder tube-shape, the concrete open caisson arrange in directly over the foundation pile top soil body, seted up the counter-force beam hole on the bottom lateral wall of concrete open caisson, the counter-force beam hole on insert and to have put the counter-force roof beam, set up loading device between concrete open caisson and the foundation pile, loading device along the free uplift of concrete open caisson axial, erect on the foundation pile and put the displacement pole, the upper end of displacement pole is passed the steel backing plate and is extended subaerially, the lower extreme of displacement pole is fixed in on the foundation pile, the displacement pole side is connected with displacement collection system, displacement collection system be displacement sensor. According to the load loaded by the loading device and the displacement generated by the displacement rod, the data acquisition of the vertical static load test of the foundation pile can be completed.
The displacement sensor is also called a linear sensor and is used for measuring the displacement of the movement of an object. The existing displacement sensor mostly adopts a contact measurement mode, a measurement medium is required to be directly contacted with a measured object in the contact measurement, the problem of self abrasion or measurement error accumulation exists in the long-term use, parts and maintenance are required to be frequently replaced, and the measurement precision is limited.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a foundation pile displacement measuring device based on a non-contact displacement measuring instrument, which adopts a specific displacement rod to form the non-contact displacement measuring instrument and improves the measuring precision.
The utility model adopts the following technical scheme to solve the technical problem:
the utility model provides a foundation pile displacement measurement device based on non-contact displacement measurement appearance, is provided with the loading device of the free lifting concrete open caisson of vertical direction including arranging the cylindric concrete open caisson directly over the foundation pile in, concrete open caisson below, the upper end of foundation pile is erect and is put and be provided with the displacement pole be provided with the reaction beam on the concrete open caisson, the displacement pole includes interior pole and the loose ring of establishing in the pole periphery, interior pole inside is provided with the wave guide that comprises magnetostrictive material along its length direction, the loose ring is cyclic annular magnet, the bottom fixed connection of interior pole is in the upper surface of foundation pile, the internal diameter of loose ring is greater than the external diameter of interior pole, the loose ring passes through the screw connection and is in the top of reaction beam, the loose ring follows the concrete open caisson is relative interior pole reciprocates.
Furthermore, a plurality of through holes are formed in the movable ring around the axis of the movable ring, a plurality of screw holes corresponding to the through holes are formed in the upper surface of the counter-force beam, and internal threads matched with the external threads of the screws are arranged on the inner walls of the screw holes.
Furthermore, a through hole is formed in the center of the reaction beam, and the inner rod penetrates through the through hole and is connected to the top end of the foundation pile.
Further, the reaction beam is of a cross-shaped structure.
Furthermore, the top end of the inner rod is provided with an external thread, and the top end of the inner rod is connected to the controller through a thread.
Further, the controller is electrically connected to an external detection device.
Further, the loading device is connected with a loading control device on the ground surface.
The utility model has the following characteristics and beneficial effects:
according to the utility model, the displacement rod uses the inner rod and the movable ring of the concentric steel pipe with large and small sizes as the rod body, the inner rod is fixed above the foundation pile, the movable ring can move up and down along with the concrete open caisson relative to the inner rod, when the movable ring moves up and down, a magnetostrictive effect can be generated between a first magnetic field generated after the waveguide tube in the inner rod is electrified and a second magnetic field of the movable ring magnetic block, so that the waveguide tube generates a strain mechanical pulse signal, the detection equipment calculates and analyzes according to the collected strain mechanical pulse signal to obtain an actual displacement value of the displacement rod, the link that errors are easy to occur in measurement is avoided, and the measurement precision is improved.
The method is different from the traditional contact type displacement sensor or displacement measuring means such as a dial indicator, a specially-made displacement rod is used, the displacement of the foundation pile deeply buried underground in the static load test is transmitted to the ground, then the foundation pile displacement test is carried out through a non-contact type multipoint displacement measuring instrument, and the remote measurement of the displacement of the foundation pile in the static load detection test process of the foundation pile is realized.
Drawings
Fig. 1 is a schematic view of the structure of a displacement rod according to the present invention.
Fig. 2 is a schematic structural view of the foundation pile displacement measuring device of the present invention.
Fig. 3 is a schematic view of a connection structure of the movable ring and the reaction beam in the present invention.
FIG. 4 is a schematic sectional view A-A of FIG. 3
Fig. 5 is a schematic view of the structure of the reaction force beam in the present invention.
In the figure: the device comprises a foundation pile 1, a concrete open caisson 2, a loading device 3, a displacement rod 4, a reaction beam 5, an inner rod 6, a movable ring 7, a waveguide tube 8, a screw 9, a controller 10, a detection device 11, a loading control device 12, a screw hole 501, an internal thread 502, a through hole 503 and a through hole 701.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1-5, a foundation pile displacement measuring device based on a non-contact displacement measuring instrument comprises a cylindrical concrete open caisson 2 arranged right above a foundation pile 1, a loading device 3 capable of freely lifting the concrete open caisson 2 in the vertical direction is arranged below the concrete open caisson 2, a displacement rod 4 is vertically arranged at the upper end of the foundation pile 1, a reaction beam 5 is arranged on the concrete open caisson 2, the displacement rod 4 comprises an inner rod 6 and a movable ring 7 sleeved on the periphery of the inner rod 6, a waveguide tube 8 made of magnetostrictive material is arranged inside the inner rod 6 along the length direction of the inner rod, the movable ring 7 is an annular magnet, the bottom end of the inner rod 6 is fixedly connected to the upper surface of the foundation pile 1, the inner diameter of the movable ring 7 is larger than the outer diameter of the inner rod 6, the movable ring 7 is connected above the reaction beam 5 through a screw 9, the movable ring 7 moves up and down along with the concrete open caisson 2 relative to the inner rod 6.
According to the utility model, the displacement rod 4 uses the inner rod 6 and the movable ring 7 of the concentric steel pipe with large and small sizes as rod bodies, the inner rod 6 is fixed above the foundation pile 1, the movable ring 7 can move up and down along with the concrete open caisson relative to the inner rod, when the movable ring 7 moves up and down, a magnetostrictive effect can be generated between a first magnetic field generated after the waveguide tube 8 in the inner rod 6 is electrified and a second magnetic field of a magnetic block of the movable ring 7, so that the waveguide tube 8 generates a strain mechanical pulse signal, an actual displacement value of the displacement rod is obtained through calculation and analysis according to the collected strain mechanical pulse signal, a link that an error is easy to occur in measurement is avoided, and the measurement precision is improved.
The utility model is different from the traditional contact type displacement sensor or displacement measuring means such as a dial indicator, uses a specially-made displacement rod, transfers the displacement of the foundation pile deeply buried under the ground to the ground in the static load test, and then carries out the displacement test of the foundation pile through a non-contact type multipoint displacement measuring instrument, thereby realizing the remote measurement of the displacement of the foundation pile in the static load detection test process of the foundation pile.
As shown in fig. 1 and 3, in one embodiment of the utility model:
a plurality of through holes 701 are formed in the movable ring 7 around the axis thereof, a plurality of screw holes 501 corresponding to the through holes 701 are formed in the upper surface of the reaction beam 5, and internal threads 502 matching the external threads of the screws 9 are formed in the inner walls of the screw holes 501.
The movable ring 7 is fixed above the counter-force beam 5 through the screw 9, when the loading device 3 acts on the counter-force beam 5 upwards to lift the concrete open caisson 2 upwards, the movable ring 7 can move upwards along with the concrete open caisson 2, namely, the movable ring 7 can move upwards relative to the inner rod 6, so that the waveguide tube 8 generates a strain mechanical pulse signal.
In this embodiment, the screw holes 501 in the upper surface of the reaction beam 5 do not have to be too deep, and the movable ring 7 and the reaction beam 5 can be fixed to each other by the screws 9.
As shown in fig. 4 and 5, in one embodiment of the utility model:
a through hole 503 is opened at the center of the reaction beam 5, and the inner rod 6 is connected to the top end of the foundation pile 1 through the through hole 503.
In this embodiment, the displacement rod 4 is located at the center of the reaction beam 5, that is, at the center of the entire device, but in other embodiments, the displacement rod 4 may be located at one side of the reaction beam 5, as long as the inner rod 6 can be fixed to the foundation pile, and the movable ring 7 that is fitted around the outer periphery of the inner rod 6 can move up and down together with the reaction beam 5.
As shown in fig. 3, in the present embodiment, the reaction force beam 5 has a cross-shaped structure.
As shown in fig. 1, four through holes 701 are symmetrically distributed around the center of the movable ring 7, 4 screw holes 501 corresponding to the through holes 701 are formed in the upper surface of the reaction beam 5, and the screws 9 are symmetrically and uniformly distributed to ensure uniform stress and no offset.
As shown in fig. 1, in the present embodiment, an external thread is provided at the top end of the inner rod 6, and the top end of the inner rod 6 is connected to a controller 10 through a thread.
As shown in fig. 2, the controller 10 is electrically connected to an external detection device 11.
The loading device 3 is connected to a loading control device 12 located on the surface.
During measurement, the loading control device 12 conveys pressure oil to the loading device 3, the loading device 3 jacks up the reaction beam 5, and at the moment, the concrete open caisson 2 and the side friction resistance of the soil body and the gravity of the concrete open caisson 2 and the filling soil therein form a reaction system together. The concrete open caisson 2 drives the movable ring 7 to generate a section of displacement, the controller 10 controls the waveguide tube 8 to be electrified to work, the second magnetic field of the movable ring 7 and the first magnetic field generated by electrifying the waveguide tube 8 can generate a strain mechanical pulse signal on the waveguide tube 8 due to the magnetostrictive effect, the strain mechanical pulse signal is transmitted to the detection equipment 11, and the displacement generated by the foundation pile 1 in the loading process is obtained by measuring the moving value of the displacement rod above the foundation pile 1.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a foundation pile displacement measurement device based on non-contact displacement measurement appearance, is provided with loading device (3) that can the free lifting of vertical direction concrete open caisson (2) including placing cylindrical concrete open caisson (2) directly over foundation pile (1) in, concrete open caisson (2) below, the upper end of foundation pile (1) is erect and is put and be provided with displacement pole (4) be provided with counter-force roof beam (5), its characterized in that on concrete open caisson (2): displacement pole (4) are established movable ring (7) of interior pole (6) periphery including interior pole (6) and cover, interior pole (6) are inside to be provided with waveguide pipe (8) that constitute by magnetostrictive material along its length direction, movable ring (7) are cyclic annular magnet, the bottom fixed connection of interior pole (6) is in the upper surface of foundation pile (1), the internal diameter of movable ring (7) is greater than the external diameter of interior pole (6), movable ring (7) are connected through screw (9) the top of counter-force roof beam (5), movable ring (7) follow concrete open caisson (2) is relative interior pole (6) reciprocate.
2. The foundation pile displacement measuring device based on the non-contact displacement measuring instrument as claimed in claim 1, wherein a plurality of through holes (701) are formed in the movable ring (7) around the axis thereof, a plurality of screw holes (501) corresponding to the through holes (701) are formed in the upper surface of the reaction beam (5), and internal threads (502) matching with the external threads of the screws (9) are formed in the inner walls of the screw holes (501).
3. The foundation pile displacement measuring device based on the non-contact displacement measuring instrument as claimed in claim 1, wherein a through hole (503) is formed in the center of the reaction beam (5), and the inner rod (6) is connected to the top end of the foundation pile (1) through the through hole (503).
4. A foundation pile displacement measuring device based on a non-contact displacement measuring instrument according to claim 3, characterized in that the reaction beam (5) is of a cross-shaped structure.
5. The foundation pile displacement measuring device based on the non-contact displacement measuring instrument as claimed in claim 1, wherein the top end of the inner rod (6) is provided with an external thread, and the top end of the inner rod (6) is connected to the controller (10) through a thread.
6. A foundation pile displacement measuring device based on a non-contact displacement measuring instrument according to claim 5, characterized in that the controller (10) is electrically connected with an external detection device (11).
7. A foundation pile displacement measuring device based on a non-contact displacement measuring instrument according to claim 1, characterized in that the loading device (3) is connected with a loading control device (12) located on the surface of the earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121337111.3U CN215801843U (en) | 2021-06-16 | 2021-06-16 | Foundation pile displacement measurement device based on non-contact displacement measurement instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121337111.3U CN215801843U (en) | 2021-06-16 | 2021-06-16 | Foundation pile displacement measurement device based on non-contact displacement measurement instrument |
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| Publication Number | Publication Date |
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| CN215801843U true CN215801843U (en) | 2022-02-11 |
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| CN202121337111.3U Active CN215801843U (en) | 2021-06-16 | 2021-06-16 | Foundation pile displacement measurement device based on non-contact displacement measurement instrument |
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2021
- 2021-06-16 CN CN202121337111.3U patent/CN215801843U/en active Active
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