CN215857890U

CN215857890U - High strain detection device of prestressed foundation pile

Info

Publication number: CN215857890U
Application number: CN202120170593.1U
Authority: CN
Inventors: 陈沛; 施俊; 何百川; 刘峰; 童玲; 蒋鑫权
Original assignee: Changzhou Architectual Research Institute Group Co Ltd
Current assignee: Changzhou Architectual Research Institute Group Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2022-02-18
Anticipated expiration: 2031-01-22

Abstract

The utility model discloses a high strain detection device for a prestressed foundation pile, which comprises a precast pile partially exposed out of the ground, wherein a cushion cover is installed at the upper end of the precast pile, a vertically arranged guide rod is connected to the center of the upper end of the cushion cover, the guide rod penetrates through the center of a penetrating hammer, the penetrating hammer moves up and down relative to the guide rod, a lifting rope is connected above the penetrating hammer, the upper end of the lifting rope is connected with a crane, a unhooking device is further arranged at the upper end of the guide rod, the lifting rope is connected with the unhooking device, and the unhooking device loosens the lifting rope to enable the penetrating hammer to freely fall. Through the mode, the high-strain detection device for the prestressed foundation pile can ensure that the pile cores of the precast pile coincide in the falling process of the core penetrating hammer, and solves the problem that data received by sensors on two sides of a pile body are deviated due to the deflection of the heavy hammer in the high-strain detection process.

Description

High strain detection device of prestressed foundation pile

Technical Field

The utility model relates to the field of pile foundation detection, in particular to a high strain detection device for a prestressed foundation pile.

Background

The pile height strain detection method is widely applied to detecting the integrity of a foundation pile and measuring the vertical compression bearing capacity of the foundation pile, mainly comprises the steps of impacting the top of the foundation pile through a heavy hammer to generate an instantaneous shock wave, generating a dislocation displacement between the pile and a soil body, exciting the soil resistance around a pile body and the pile end bearing capacity, analyzing a speed curve and a force wave curve measured through an accelerometer and a strain gauge based on a fluctuation theory, and further judging the integrity of the pile body and the vertical compression bearing capacity, wherein the main detection method comprises a waveform fitting method, a CAPWAPC method, a Kaiss method (Case method), a fluctuation equation method and the like.

At present, in the aspect of a high-strain detection device, many experts and scholars at home and abroad improve the device in different forms, for example, the utility model patent with the application number of 201810820694.1 provides a device of a high-strain detection vehicle, the device mainly uses an engine of an automobile as a power device for lifting a heavy hammer, a rectangular opening is arranged in front of the detection vehicle and is used as a falling space of the heavy hammer, supporting columns are arranged in the front and the back of the vehicle and are used for stabilizing the detection vehicle, an electric hydraulic telescopic rod is arranged in each supporting column, the device is well arranged integrally, but the heavy hammer is difficult to control, the gravity center of the heavy hammer is easy to deviate, the data measured at two sides of a pile body sensor has large deviation, and the detection vehicle is difficult to enter a field for a poor field environment; the utility model with the application number of 202010583618.0 discloses a fixing support connected through a spherical hinged support and an adjusting rod, the interior of the fixing support is changed into a clamping device, the falling process of a heavy hammer is prevented from inclining, the gravity center of the heavy hammer can not be ensured to be coincident with the position of a pile center, the operation steps of the device are complex, and the connecting rod and the hinged support are not easy to carry and install in places with complex geological environments.

Disclosure of Invention

The utility model mainly solves the technical problem of providing a high strain detection device for a prestressed foundation pile, which can ensure that the pile centers of a precast pile coincide in the falling process of a core-penetrating hammer and solve the problem that data received by sensors at two sides of a pile body have deviation due to the deviation of a heavy hammer in the high strain detection process.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a high strain detection device of prestressing force foundation pile, includes that the part exposes out in the precast pile on ground, the upper end of precast pile installs the cover of pad, the center of cover of pad upper end is connected with the guide arm of vertical setting, the guide arm passes the center of punching hammer, the relative guide arm of punching hammer moves from top to bottom, the top of punching hammer is connected with the lifting rope, the lifting rope upper end is connected with the crane, the upper end of guide arm still is equipped with unhooking device, the lifting rope is connected with unhooking device, unhooking device loosens the lifting rope and makes the punching hammer do the free fall motion.

In a preferred embodiment of the present invention, the lower end of the guide bar is screwed on the center of the cushion cover.

In a preferred embodiment of the utility model, the centers of the precast pile, the cushion cover and the through hammer are in the same straight line in the vertical direction.

In a preferred embodiment of the utility model, the mat cover is fastened to the precast pile by screws.

In a preferred embodiment of the utility model, the lower end of the cushion cover is in a hoop structure, and two ends of the cushion cover are connected through screws so as to be tightly held on the precast pile.

In a preferred embodiment of the utility model, the unhooking device is fixedly connected to a support, and the lower end of the support is fixedly connected to the ground.

In a preferred embodiment of the utility model, the precast pile is further provided with a strain gauge and an accelerometer, the strain gauge and the accelerometer are connected with a pile driving analyzer, the pile driving analyzer is connected with a computer and a plotter, and the computer is further connected with a printer.

The utility model has the beneficial effects that: the high strain detection device for the prestressed foundation pile can ensure that the pile centers of the precast pile coincide in the falling process of the through hammer, and solve the problem that data received by sensors on two sides of a pile body have deviation due to the deviation of the through hammer in the high strain detection process.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic structural diagram of a high strain detection device for prestressed foundation piles according to a preferred embodiment of the present invention;

FIG. 2 is a schematic partial structural view of another preferred embodiment of the high strain detector for prestressed foundation piles according to the present invention;

the parts in the drawings are numbered as follows: 1. precast pile, 2, cushion cover, 3, guide rod, 4, punching hammer, 5, lifting rope, 6, crane, 7, unhooking device, 8, screw, 9, support, 10, strain gauge, 11, accelerometer, 12, piling analyzer, 13, computer, 14, plotter, 15 and printer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the high strain detection device for the prestressed foundation pile comprises a precast pile 1 partially exposed out of the ground, a cushion cover 2 is installed at the upper end of the precast pile 1, a vertically arranged guide rod 3 is connected to the cushion cover 2, a penetrating hammer 4 which moves up and down along the vertical direction is movably arranged on the guide rod 3, a lifting rope 5 is connected above the penetrating hammer 4, the upper end of the lifting rope 5 is connected with a crane 6, the lifting rope 5 is connected with a unhooking device 7, and the unhooking device 7 loosens the lifting rope 5 to enable the penetrating hammer 4 to do free falling motion. The unhooking device 7 mainly plays a role in separating the piercing hammer 4, so that the piercing hammer 4 is ensured to freely fall along the guide rod 3, and the center of the piercing hammer 5 is ensured not to change in the falling process.

In addition, the lower end of the guide rod 3 is screwed on the center of the cushion cover 2.

In addition, the centers of the precast pile 1, the cushion cover 2 and the through hammer 4 are in the same straight line in the vertical direction.

In addition, the cushion cover 2 is fastened on the precast pile 1 through screws 8. The cushion cover 2 for protecting the pile head is made of rigid plastic materials and mainly used for fixing the guide rod 3, so that the center of gravity of the penetrating hammer 5 is superposed with the position of the pile core after the penetrating hammer falls along the guide rod 3, and the data measured by a sensor arranged on the pile is ensured to be similar; the second one plays the role of protecting the pile head. The guide rod 3 is made of stainless steel materials, the upper end of the guide rod is provided with a smooth U-shaped round head, the friction force between the guide rod 3 and the center-penetrating hammer 5 is reduced, and the lower end of the guide rod is provided with a rotary thread type, so that the guide rod can be screwed on the cushion sleeve.

Another connection mode of the cushion cover and the precast pile is shown in fig. 2, the lower end of the cushion cover 2 is in a hoop structure, and two ends of the cushion cover are connected through screws 8 to be tightly held on the precast pile 1.

In addition, the unhooking device 7 is fixedly connected to the support 9, and the lower end of the support 9 is fixedly connected to the ground. The unhooking device mainly has the advantages that the center penetrating hammer is separated from the traction of the upper rope and then performs free falling motion, the internal structure of the device is provided with a left semi-circular ring structure and a right semi-circular ring structure, the left semi-circular ring structure and the right semi-circular ring structure are connected with the unhooking handle in front, when the center penetrating hammer is pulled to a set height, the rope bound on the unhooking handle is pulled to drive the left semi-circular ring and the right semi-circular ring to be separated, and the center penetrating hammer is made to fall freely.

In addition, the precast pile 1 is further provided with a strain gauge 10 and an accelerometer 11, the strain gauge 10 and the accelerometer 11 are connected with a pile driving analyzer 12, the pile driving analyzer 12 is connected with a computer 13 and a plotter 14, and the computer 13 is further connected with a printer 15.

The high strain detection device for the prestressed foundation pile has the following specific working principle: firstly, the cushion cover 2 is fixed on the precast pile 1 through the screw 8, then the bracket 1 is fixed on the ground, the crane 9 is then activated, the piercing hammer 5 is lifted to the set height, the guide rod 3 is then screwed through the piercing hammer 5 onto the rubber sleeve, then checking whether the devices such as the strain gauge 10 and the accelerometer 11 can normally operate or not, and after determining that no error exists, the position of the punching hammer 5 is adjusted to a set height, after the punching hammer 5 is stabilized, the unhooking device 7 is pulled to lead the punching hammer 5 to do free falling motion along the guide rod 3, because the guide rod 3 is fixed at the center of the rubber sleeve gasket, and the sleeve gasket is manufactured according to the corresponding pile shape, the position of the pile center is superposed with the center of the rubber sleeve gasket, and then guaranteed that punch-through hammer 5 whereabouts process does not take place the skew, and its hammer core effect is in pile core position, guarantees that the sensor survey data of both sides is close, provides accurate data for the integrality of analysis pile shaft and its bearing capacity.

Different from the prior art, the high-strain detection device for the prestressed foundation pile can ensure that the pile centers of the precast pile coincide in the falling process of the core penetrating hammer, and solves the problem that data received by sensors on two sides of a pile body have deviation due to the deflection of a heavy hammer in the high-strain detection process.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The high-strain detection device for the prestressed foundation pile comprises a precast pile, wherein part of the precast pile is exposed out of the ground, and the high-strain detection device is characterized in that a cushion cover is mounted at the upper end of the precast pile, a vertically arranged guide rod is connected to the center of the upper end of the cushion cover, the guide rod penetrates through the center of a punching hammer, the punching hammer moves up and down relative to the guide rod, a lifting rope is connected to the upper portion of the punching hammer, the upper end of the lifting rope is connected with a crane, a unhooking device is further arranged at the upper end of the guide rod and connected with the lifting rope, and the unhooking device loosens the lifting rope to enable the punching hammer to freely fall.

2. The prestressed foundation pile high strain detection apparatus as claimed in claim 1, wherein a lower end of said guide rod is screwed on a washer housing.

3. The prestressed foundation pile high-strain detecting device as claimed in claim 2, wherein centers of said precast pile, said mat cover and said through hammer are in the same line in a vertical direction.

4. The prestressed foundation pile high-strain detecting device as claimed in claim 3, wherein said mat cover is fastened to the precast pile by means of screws.

5. The prestressed foundation pile high-strain detecting device as claimed in claim 3, wherein the lower end of said mat cover is a hoop structure, and both ends of said mat cover are connected by screws so as to be tightly held on the precast pile.

6. The prestressed foundation pile high-strain detecting device as claimed in any one of claims 1 to 5, wherein said unhooking means is fixedly connected to a support, and the lower end of said support is fixedly connected to the ground.

7. The prestressed foundation pile high-strain detection device as claimed in claim 6, wherein the precast pile is further provided with a strain gauge and an accelerometer, the strain gauge and the accelerometer are connected with a pile driving analyzer, the pile driving analyzer is connected with a computer and a plotter, and the computer is further connected with a printer.