CN218350027U

CN218350027U - Standard penetration test device utilizing electromagnetic attraction lock

Info

Publication number: CN218350027U
Application number: CN202122340386.9U
Authority: CN
Inventors: 王健; 王燕; 吴斌; 王枫; 于庆
Original assignee: Shenzhen Water Planning And Design Institute Co ltd
Current assignee: Shenzhen Water Planning And Design Institute Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2023-01-20
Anticipated expiration: 2031-09-23

Abstract

A kind of standard penetration test device using electromagnetic attraction lock, including: the electromagnetic suction lock, the core penetrating hammer, the pressure bearing rod, the connecting rope and the standard penetrating head. The electromagnetic attraction lock and the core penetrating hammer are both sleeved on the bearing rod and can move between the head end and the tail end of the bearing rod. Connect rope one end and electromagnetism and inhale the lock and connect, the head end of bearing pole is passed to one end, connects the rope and is used for promoting the electromagnetism and inhales the lock. The electromagnetic suction lock can adsorb the punching hammer and drive the punching hammer to lift along with the connecting rope. The standard penetration head is connected with one side of the tail end of the pressure-bearing rod far away from the core-penetrating hammer. Through magnetic adsorption, the promotion of comparatively stable assurance punching hammer reduces the promotion failure rate of punching hammer, improves standard penetration test efficiency. The punching hammer is arranged between the head end and the tail end of the bearing rod, so that the punching hammer can be lifted to a relatively constant height, and a standard penetration test is more accurate. The standard penetration test device has simple and reliable structure, is convenient to operate and can improve the standard penetration test efficiency.

Description

Standard penetration test device utilizing electromagnetic attraction lock

Technical Field

The application relates to the technical field of geotechnical engineering investigation, in particular to a standard penetration test device utilizing an electromagnetic attraction lock.

Background

In the means of geotechnical engineering investigation, a drilling machine is utilized to drill underground formations and simultaneously carry out corresponding in-situ test tests. The SPT is a reliable method to find out the density of underground soil layers. According to geotechnical engineering investigation standards, a hammering impact number required for every 30cm of penetration in a certain stratum is obtained by using a standard penetration test, so that the state of the compactness of the stratum is a hard plastic shape, a soft plastic shape or a flow plastic shape. After drilling is finished, the underground stratum of the construction site is evaluated, and a corresponding design scheme is provided by combining the actual situation of the stratum, so that the smooth construction of the engineering under the conditions of controlling the cost and guaranteeing the quality safety is ensured.

In the traditional standard penetration test device, an iron ring is placed in the center of the through hammer, and the through hammer is vertically pulled up by friction force. However, in the test, the efficiency of the SPT test is low because the traction device is corroded or lubricated insufficiently, which results in the failure of the heavy hammer.

SUMMERY OF THE UTILITY MODEL

The application provides a standard penetration test device utilizing electromagnetic attraction lock, and the main purpose thereof is to improve the efficiency of the standard penetration test.

The application provides an embodiment provides a standard penetration test device who utilizes electromagnetic attraction lock, includes: the electromagnetic suction lock, the core penetrating hammer, the pressure bearing rod, the connecting rope and the standard penetrating head; the electromagnetic suction lock and the core penetrating hammer are sleeved on the bearing rod and can move between the head end and the tail end of the bearing rod; one end of the connecting rope is connected with the electromagnetic lock, one end of the connecting rope penetrates through the head end of the bearing rod, and the connecting rope is used for lifting the electromagnetic lock; the electromagnetic suction lock can adsorb the core penetrating hammer and drive the core penetrating hammer to lift along with the connecting rope; and the standard penetration head is connected with one side of the tail end of the pressure-bearing rod, which is far away from the piercing hammer.

In one embodiment, the electromagnetic suction lock comprises a sucker, and a power supply and a switch which are arranged on the sucker, wherein the switch is used for realizing the on-off of a circuit; when the switch is turned off, the magnetism of the sucker disappears, and the sucker is separated from the sucker.

In one embodiment, a charging port is arranged on the electromagnetic absorption lock, and the charging port is used for charging the power supply.

In one embodiment, the sucker is provided with a groove, and the switch is positioned in the groove; when the switch is convex relative to the surface of the sucker, the circuit is in a conducting state, and when the switch is concave relative to the surface of the sucker, the circuit is in a disconnecting state.

In one embodiment, a cover plate capable of being opened and closed relative to the groove is arranged on the groove, and the switch is arranged in the groove through an elastic piece; when the cover plate is covered, the switch is contained in the groove, and the elastic piece is in a compressed state.

In one embodiment, the punching hammer comprises a hammer body and an adsorption piece, wherein the hammer body is made of rigid materials, and the adsorption piece is made of magnetic materials; the electromagnetic suction lock can be connected with the adsorption piece on the punching hammer in an adsorption mode.

In one embodiment, the pressure-bearing rod is made of a non-magnetic alloy material.

In one embodiment, the modular penetration head and the pressure-bearing rod are detachably connected.

In one embodiment, a plurality of extension rods are detachably connected between the modular penetration head and the pressure-bearing rod, and the extension rods are used for extending the axial length of the modular penetration testing device utilizing the electromagnetic attraction lock.

In one embodiment, the end of the standard penetration head is in the shape of a cutting edge, and the angle of the cutting edge is 18-20 degrees.

According to the standard penetration test device who utilizes electromagnetic attraction lock of above-mentioned embodiment, connect the rope and can promote electromagnetic attraction lock, the electromagnetism is inhaled the lock and can adsorb as an organic wholely with the punching hammer again, so the punching hammer can be promoted through connecting the rope indirectly. Adopt electromagnetic to inhale lock and punching hammer and pass through magnetic adsorption to the promotion of punching hammer is realized to the mode of rope is connected in the cooperation. Through magnetic adsorption, the promotion of assurance punching hammer that can be comparatively stable reduces the fault rate that punching hammer promoted the failure, and then improves standard penetration test efficiency. The punching hammer is arranged between the head end and the tail end of the bearing rod, so that the punching hammer can be lifted to a constant height, and then the punching hammer can fall to release specific gravitational potential energy. In each test, the lifting height does not need to be measured or paid attention to, and only the lifting of specific times is realized according to the test condition. The standard penetration test device designed by the application has the advantages of simple and reliable structure, convenience in operation and capability of improving the standard penetration test efficiency, greatly ensures the safety performance of the test, and is worth popularizing and using.

Drawings

FIG. 1 is a schematic perspective view of an exemplary SPT apparatus according to the present disclosure;

FIG. 2 is a schematic plan view of an exemplary SPT apparatus according to the present invention;

FIG. 3 is a schematic diagram of an electromagnetic attraction lock according to an embodiment of the present application;

FIG. 4 is a schematic view of a piercing hammer according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a SPT apparatus according to an embodiment of the present application;

FIG. 6 is a schematic diagram of an electromagnetic attraction lock according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a circuit of an electromagnetic attraction lock according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the description of the methods may be transposed or transposed in order, as will be apparent to a person skilled in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified.

1-5, in one embodiment, a SPT device utilizing an electromagnetic force lock includes: the electromagnetic suction lock comprises an electromagnetic suction lock 1, a core penetrating hammer 2, a pressure bearing rod 3, a connecting rope 4 and a standard penetration head 9. The electromagnetic attraction lock 1 and the punching hammer 2 are both sleeved on the bearing rod 3 and can move between the head end and the tail end of the bearing rod 3. Connect 4 one ends of rope and electromagnetic lock 1 and be connected, the hole on the 3 head ends of bearing bar is passed to one end, connects rope 4 and is used for promoting electromagnetic lock 1. The electromagnetic suction lock 1 can adsorb the core penetrating hammer 2 and drive the core penetrating hammer 2 to lift along with the connecting rope 4. The standard penetration head 9 is connected with one side of the tail end of the pressure-bearing rod 3 far away from the through hammer 2.

Adopt above-mentioned standard penetration test device that utilizes electromagnetic attraction lock, hereinafter be referred to as standard penetration test device for short, connect rope 4 and can promote electromagnetic attraction lock 1, electromagnetic attraction lock 1 can adsorb as an organic wholely with punching hammer 2 again, so punching hammer 2 is indirect can be promoted through connecting rope 4. Adopt electromagnetic attraction lock 1 and punching hammer 2 to pass through magnetic adsorption to the mode of rope 4 is connected in the cooperation, realize the promotion of punching hammer 2. Through magnetic adsorption, the promotion of assurance punching hammer 2 that can be comparatively stable reduces the fault rate that punching hammer 2 promoted the failure, and then improves standard penetration test efficiency. The punching hammer 2 is arranged between the head end and the tail end of the pressure bearing rod 3, so that the punching hammer 2 can be lifted to a constant height, and the punching hammer 2 can fall to release specific gravitational potential energy. In each test, the lifting height does not need to be measured or paid attention to, and only the lifting of specific times is realized according to the test condition. The standard penetration test device designed by the application has the advantages of simple and reliable structure, convenience in operation and capability of improving the standard penetration test efficiency, greatly ensures the safety performance of the test, and is worth popularizing and using.

The electromagnetic suction lock 1 comprises a suction cup 5, a power supply 14 and a switch 6, wherein the power supply 14 and the switch 6 are arranged on the suction cup 5, and the switch 6 is used for realizing the on-off of a circuit. When the switch 6 is closed, the suction cup 5 has magnetism and can adsorb the piercing hammer 2, and when the switch 6 is disconnected, the magnetism of the suction cup 5 disappears, and the piercing hammer 2 is separated from the suction cup 5. As shown in fig. 7, the suction cup 5, the power supply 14 and the switch 6 on the electromagnetic lock 1 are connected in series to form a circuit, and the switch 6 is used to turn on or off the circuit, so as to control the magnetism of the suction cup 5 in the electromagnetic lock 1. When the switch 6 is closed, the circuit is conducted, the sucker 5 has magnetism and can adsorb the punching hammer 2, and the punching hammer 2 can be lifted to the head end from the tail end of the pressure bearing rod 3 through the connecting rope 4. When the piercing hammer 2 is lifted to the required height, the switch 6 and the sucker 5 are switched off, the piercing hammer 2 falls or falls freely, and the penetration test of the standard penetration head 9 is realized. The distance between the head end and the tail end of the punching hammer 2 corresponds to the height of the punching hammer 2 lifted each time, the height is set according to geotechnical engineering investigation standards, for example, 76cm, and the punching hammer 2 is correspondingly lifted by 76cm from the tail end to the head end of the pressure-bearing rod 3 each time.

Specifically, the power supply 14 is 12V, a groove is formed in the sucker 5, and the switch 6 is located in the groove. When the switch 6 protrudes relative to the surface of the suction cup 5, the circuit is in a conducting state, and when the switch 6 is sunken relative to the surface of the suction cup 5, the circuit is in a disconnecting state. When lifting the punching hammer 2, the switch 6 protrudes to be in a closed state, as shown in fig. 1, when the switch 6 on the electromagnetic lock 1 contacts with the head end of the bearing rod 3, the electromagnetic lock continues to lift upwards, the switch 6 can be extruded and sunken and is in an off state again, the magnetism of the electromagnetic lock 1 disappears, and the punching hammer 2 freely falls due to gravity. By adopting the structure, the mode that the punching hammer 2 triggers to fall is simplified, so that the circuit on the electromagnetic suction lock 1 is more easily switched on or off, and the operation procedures of workers are simplified as much as possible.

The groove is provided with a cover plate 15 which can be opened and closed relative to the groove, and the switch 6 is arranged in the groove through an elastic piece. When the cover plate 15 is closed, the switch 6 is accommodated in the recess, and the elastic member is in a compressed state. When the cover plate 15 is opened, the switch 6 is under the elastic force of the elastic member, and the upward protrusion is in a conducting state. Through the cooperation of elastic component and apron 15, comparatively simple realization switch 6 switching between disconnection and closure, set up apron 15 and can also protect switch 6, realize that the outage is accomodate. Specifically, as shown in fig. 6, a rotating shaft is disposed on the cover plate 15, the cover plate 15 can rotate relative to the rotating shaft to open and close the opening of the groove, and the elastic member can be a spring. In other embodiments, the rotation axis of the cover plate 15 may also be parallel to the top surface of the suction cup 5, or the cover plate 15 and the top surface of the suction cup 5 may also be magnetically attracted to open or close the opening of the groove, or the cover plate 15 is fastened to the top surface of the suction cup 5. And is not particularly limited as long as it is possible to open the groove opening or close the groove opening by the cover plate 15.

Preferably, the electromagnetic absorption lock 1 is provided with a charging port, and the charging port is used for charging the power supply 14. The mobile power supply 14 is convenient to use and carry. Set up the mouth that charges, can manifold cycles use the electromagnetic to inhale lock 1, environmental protection more. By providing the power supply 14 inside the suction cup 5, the power supply is better protected and the external structure of the suction cup 5 is simplified. In other embodiments, a battery may be provided, so that the electromagnetic lock 1 has a double security. With the power supply 14 when the power supply 14 is powered, a battery may be used as the power supply 14 when the power supply 14 is not powered, making the SPT apparatus more flexible to use.

The punching hammer 2 comprises a hammer body 7 and an adsorption part 8, and the hammer body 7 and the adsorption part 8 are connected into a whole. The hammer 7 is made of a rigid material having high strength and resistance to deformation, and the adsorbing member 8 is made of a magnetic material having high strength and resistance to deformation, for example, iron is selected for the adsorbing member 8. The electromagnetic suction lock 1 can be connected with an adsorption piece 8 on the piercing hammer 2 in an adsorption manner.

The bearing rod 3 is made of non-magnetic alloy material to ensure that the electromagnetic attraction lock 1 is not interfered and can work normally when the standard penetration test device is used. Specifically, as shown in fig. 1-2, the pressure-bearing rod 3 includes a supporting rod 11, a second limiting member 12 fixed at a head end of the supporting rod 11, and a first limiting member 10 fixed at a tail end of the supporting rod 11. The first limiting member 10 has high strength and is a rigid material with high strength and deformation resistance. During the operation of the standard penetration test device, the first limiting part 10 can bear the huge impact force generated after the piercing hammer 2 freely falls down, and then the soil layer is broken through the standard penetration head 9.

In other embodiments, the standoffs 9 and the pressure bearing beams 3 are removably attached, which facilitates replacement of different standoffs 9 or replacement of damaged standoffs 9 as desired.

Simultaneously, the connection can be dismantled to standard penetration head 9 and pressure-bearing rod 3, is convenient for can dismantle between standard penetration head 9 and pressure-bearing rod 3 and connects a plurality of extension rods 13, and extension rod 13 can increase standard penetration test device's axial length. In actual use, as shown in fig. 1, the first limiting member 10 and the portion above the first limiting member 10 are all located on the ground. When drilling with the SPT, if the depth is large, multiple extension rods 13, for example two extension rods 13, may be provided. If the depth is not so great, an extension rod 13 may be provided to increase the length appropriately.

The end part of the standard penetration head 9 is in a cutting edge shape, and the angle of the cutting edge is 18-20 degrees. Under this angle range, the SPT head 9 can apply force to the contacting surface layer well.

The standard penetration test device utilizing the electromagnetic attraction lock comprises the following use methods:

step1: in an engineering investigation project, when drilling exploration is carried out, a standard penetration test is carried out according to the compactness of each sand layer in a part of drill holes according to relevant specifications, and when a drilling instrument drills into a certain underground stratum, a standard penetration head 9 is installed at the bottom of an extension rod 13 and is contacted with the tested stratum.

Step2: the top of the extension rod 13 exposed out of the ground is connected and installed with a pressure-bearing rod 3 which is sleeved with an electromagnetic lock 1 and a piercing hammer 2.

Step3: the electromagnetic suction lock 1 in the power-on state is placed down to be in contact with the punching hammer 2 through the connecting rope 4, so that the suction disc 5 and the adsorption piece 8 are mutually attracted.

Step4: promote sucking disc 5 at the uniform velocity through connecting rope 4, simultaneously, the penetrating hammer 2 that is attracted also is promoted to the top, and the switch 6 on the lock 1 is inhaled with second locating part 12 contact and is shrink in the inside of sucking disc 5 after being extruded to the outage, 5 magnetism of sucking disc disappear, at this moment, penetrating hammer 2 is after losing magnetism and inhales, carries out the free hammer motion that falls, and strikes first locating part 10, thereby penetrates the underground stratum with standard penetrating head 9.

Step5: according to engineering geological survey regulations, 1 free drop hammer impacts the standard penetration head 9 to enter the soil body, and the impact is recorded as 1 strike. The standard penetration head 9 needs M times of striking when being impacted into the soil layer for 45cm, and is a complete standard penetration test. Since the surface layer of the soil layer is disturbed by the drilling machine instead of reflecting the real compactness of the undisturbed soil layer, the n times of striking by the front 15cm of the standard penetration head 9 entering the pattern layer 45cm are not included in the striking times of the standard penetration test of the soil layer. And finally obtaining the marked penetration number of the stratum with 30cm as M-n times.

Steps 1 to 5 are a single SPT test, i.e., a method of using the SPT apparatus using the electromagnetic attraction lock. The above methods of 45cm, 15cm and 30cm are only examples to illustrate the method of using the SPT apparatus of the present application, and should not be construed as limiting the present application. During engineering geological exploration, the standard penetration test device adopts a specially-made electromagnetic absorption lock 1 to match with a core penetrating hammer 2, a pressure bearing rod 3 and a connecting rope 4 to carry out a standard penetration test on an underground stratum to obtain a corresponding impact number, namely, finding out the compactness of the stratum.

The present application has been described with reference to specific examples, which are provided only to facilitate the understanding of the present application and are not intended to limit the present application. For a person skilled in the art to which the application pertains, several simple deductions, modifications or substitutions may be made according to the idea of the application.

Claims

1. The utility model provides an utilize electromagnetic attraction lock's standard penetration test device which characterized in that includes: the electromagnetic suction lock, the core penetrating hammer, the pressure bearing rod, the connecting rope and the standard penetrating head; the electromagnetic suction lock and the core penetrating hammer are sleeved on the bearing rod and can move between the head end and the tail end of the bearing rod; one end of the connecting rope is connected with the electromagnetic lock, and the other end of the connecting rope penetrates through the head end of the bearing rod, and the connecting rope is used for lifting the electromagnetic lock; the electromagnetic suction lock can adsorb the core penetrating hammer and drive the core penetrating hammer to lift along with the connecting rope; and the standard penetration head is connected with one side of the tail end of the pressure-bearing rod, which is far away from the center-penetrating hammer.

2. The apparatus for the SPT test of an electromagnetic attraction lock as claimed in claim 1, wherein the electromagnetic attraction lock comprises a suction cup, a power supply and a switch, the power supply and the switch are disposed on the suction cup, and the switch is used for switching on and off the circuit; when the switch is turned off, the magnetism of the sucker disappears, and the sucker is separated from the sucker.

3. The apparatus for the SPT test using an electromagnetic attraction lock as claimed in claim 2, wherein a charging port is provided on the electromagnetic attraction lock, the charging port being used to charge the power supply.

4. The apparatus for the SPT test using electromagnetic attraction lock as claimed in claim 2, wherein said suction cup has a recess therein, and said switch is located in said recess; when the switch is convex relative to the surface of the sucker, the circuit is in a conducting state, and when the switch is concave relative to the surface of the sucker, the circuit is in a disconnecting state.

5. The apparatus for testing the SPT of claim 4, wherein the recess is provided with a cover plate capable of opening and closing relative to the recess, and the switch is disposed in the recess via an elastic member; when the cover plate is covered, the switch is contained in the groove, and the elastic piece is in a compressed state.

6. The apparatus for the SPT test using electromagnetic attraction lock as claimed in claim 1, wherein said piercing hammer comprises a hammer body and an absorbing member, said hammer body is made of rigid material, said absorbing member is made of magnetic material; the electromagnetic suction lock can be connected with the adsorption piece on the punching hammer in an adsorption mode.

7. The apparatus of claim 1, wherein the pressure-bearing rod is made of a non-magnetic alloy material.

8. The apparatus of claim 1, wherein the modular penetration head is detachably connected to the pressure-bearing rod.

9. The apparatus of claim 8, wherein a plurality of extension rods are detachably connected between the modular penetration head and the pressure-bearing rod, and the extension rods are used to extend an axial length of the apparatus.

10. The apparatus for the SPT test using electromagnetic attraction lock of claim 1, wherein the SPT head has a cutting edge with an angle of 18-20 °.