CN110987671A

CN110987671A - Device for applying impact excitation inside soil layer of laboratory sand box

Info

Publication number: CN110987671A
Application number: CN201911227710.7A
Authority: CN
Inventors: 马蒙; 刘阔阔; 董书伟; 孙晓静; 刘卫丰
Original assignee: Beijing Keshang Instrument Technology Co Ltd; Beijing Jiaotong University
Current assignee: Beijing Keshang Instrument Technology Co Ltd; Beijing Jiaotong University
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-04-10

Abstract

The invention provides a device for applying impact excitation inside a soil layer of a sand box in a laboratory, which comprises: the device comprises a sleeve, a drill bit, a hammer rod, a hammer body, a hammer head and a sensor; the sleeve is installed at the sleeve top, and the sleeve pipe is used for providing an inner space, and the drill bit install in the sleeve pipe bottom is used for assisting the device bores into the soil body, the hammer stem through vertical bearing install in the sleeve pipe for reciprocate in the sleeve pipe, the hammer block is installed in the lower extreme of hammer stem fixedly, is used for increasing the counter weight quality of power hammer, the tup is installed in the lower extreme of hammer stem to be located the lower part of hammer block, be used for exerting the hammering power, the sensor is fixed in on the tup, be used for the record power signal. The device can apply underground deep impact excitation load in an in-situ or laboratory environment, control the depth of the vibration source and the force of the vibration source, and drill holes through the device without the help of other machines or concrete dado.

Description

Device for applying impact excitation inside soil layer of laboratory sand box

Technical Field

The invention relates to the technical field of sand box dynamics, in particular to a device for applying impact excitation inside a soil layer of a sand box in a laboratory.

Background

In recent years, the traffic environment has attracted much attention, and the arrangement of a vibration isolation structure in a wave propagation path is an economical and effective solution to the vibration of the traffic environment. The flask dynamics experiment is one of important means for researching the propagation rule of waves in the soil body, and the propagation rule of vibration in the soil body is researched by generally picking up vibration response through vibration excitation equipment such as a force hammer and a sensor.

The existing laboratory sand box dynamic vibration excitation equipment comprises the following two types: (1) a hand-held small power hammer; (2) mechanical drill type drop hammer. The first equipment has the disadvantages that the load is applied by swinging the hammer manually, the amplitude of the force cannot be ensured to be accurate, and secondary hammering and man-made signal interference are easily caused; the second equipment has the defects that a concrete sleeve needs to be manufactured in advance through mechanical drilling, the cost is high, the problems of water accumulation, soil body collapse and the like are easily caused at the bottom of a hole, and the accuracy of an experimental result is interfered.

Therefore, a drilling vibration excitation device suitable for a sand box soil dynamics experiment and a vibration damping performance test is needed.

Disclosure of Invention

The invention provides a device for applying impact excitation inside a soil layer of a sand box in a laboratory, which aims to solve the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme.

The invention provides a device for applying impact excitation inside a soil layer of a laboratory sand box, comprising: the device comprises a sleeve, a drill bit, a hammer rod, a hammer body, a hammer head and a sensor;

the sleeve is installed the sleeve top, the sleeve pipe is used for providing an inner space, the drill bit install in the sleeve pipe bottom is used for assisting the device bores into the soil body, the hammer stem through vertical bearing install in the sleeve pipe for reciprocate in the sleeve pipe, the hammer block fixedly install in the lower extreme of hammer stem is used for increasing the counter weight quality of power hammer, the tup install in the lower extreme of hammer stem, and be located the lower part of hammer block, be used for applying the hammering power.

The sensor is fixed on the hammer head and used for recording a hammering force signal.

Preferably, the sleeve is a seamless steel straight pipe.

Preferably, the sleeve is threadedly attached to the top of the casing and the drill bit is threadedly attached to the bottom of the casing.

Preferably, the drill bit is at a 90 ° cone angle.

Preferably, the hammer rod is a steel graduated tube.

Preferably, the hammer block is a cylindrical steel block, the hammer head is made of nylon or rubber materials and is fixed at the bottommost end of the hammer rod through threaded connection.

Preferably, the sensor is a 108a010 type force sensor; the hammer is connected to a data acquisition instrument through an L5-BNC type data acquisition line to record signals of the force applied by the hammer body.

Preferably, the device further comprises radial arms mounted on both sides of the sleeve for increasing the moment arm to apply torque.

According to the technical scheme provided by the device for applying the impact excitation inside the soil layers of the laboratory sand box, the device is suitable for in-situ experiments or experimental environments of the laboratory sand box, and can apply hammering loads in the soil layers with different depths; the magnitude of the impact force is adjusted by lifting the hammer rod to different heights, and the impact force freely falls from the same scale on the hammer rod every time to ensure that the amplitude of the impact force is the same every time; the force hammer can enter deep soil layers in a self-tapping mode through the mode of the rotating force arm, and drilling can be carried out through the device without the aid of other machines or concrete dado.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the present embodiment of an apparatus for applying impact excitation inside a soil layer of a laboratory flask;

description of reference numerals:

1 sleeve, 2 sleeve, 3 drill, 4 hammer rod, 5 hammer body, 6 hammer head, 7 hammer head, 8 sensor, and 9 vertical bearing.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

To facilitate understanding of the embodiments of the present invention, the following description will be further explained by taking specific embodiments as examples with reference to the accompanying drawings.

Examples

Fig. 1 provides an apparatus for applying impact excitation inside a soil layer of a laboratory flask according to the present embodiment, and with reference to fig. 1, the apparatus includes: the drill bit comprises a casing 1, a sleeve 2, a drill bit 3, a hammer rod 4, a hammer body 5, a hammer head 6, a sensor 7 and a spiral arm 9.

Sleeve 2 is installed at sleeve 1 top, sleeve 1 is used for providing an inner space, drill bit 3 is installed in sleeve 1 bottom, be used for assisting the device to bore into the soil body, hammer stem 4 is installed in sleeve 2 through vertical bearing 8, be used for reciprocating at the intraductal cover, hammer block 5 is installed in the lower extreme of hammer stem 4 fixedly, be used for the counter weight quality of increase power hammer, schematically, the hammer block is hollow structure, hammer stem and hammer block interference fit installation, tup 6 is installed in the lower extreme of hammer stem 4, and be located the lower part of hammer block 5, be used for exerting hammering load through the free fall.

The sensor 7 is fixed on the hammer head 6 and is a 108A010 type force sensor; the data acquisition instrument is connected by an L5-BNC type data acquisition line to record the signal of the force applied by the hammer body.

The radial arms 9 are arranged on two sides of the sleeve 2 and used for increasing the force arm and applying torque.

The sleeve in this embodiment is a seamless steel straight pipe. The sleeve 2 is screwed on top of the casing 1 and the drill bit 3 is screwed on the bottom of the casing 1. The drill bit 3 has a 90 ° cone angle. The hammer rod 4 is a steel graduated tube. The hammer body 5 is a cylindrical steel block, the hammer head 6 is made of nylon materials and is fixed at the bottom end of the hammer rod 4 through threaded connection.

The following are the experimental procedures using the apparatus of this example:

before use, the hammer rod penetrates through the vertical bearing in the sleeve, then the data acquisition line penetrates through the hammer rod and the hollow hammer body to be connected to the sensor, and the other end of the data acquisition line is connected with data acquisition equipment; the hammer body is connected to the hammer rod through threads, the sensor is fixed to the hammer body through threads, and the hammer head is fixed to the sensor through threads. Then the hammer rod and the connected part are placed in the sleeve, and the sleeve are connected and fixed through threads. The radial arm is mounted on the sleeve.

During the use, put the vibration exciter on the soil body surface perpendicularly, exert the sharp cone effect of moment of torsion and drill bit through rotatory spiral arm for the sleeve gets into the stratum gradually and formulates the degree of depth, then carries out vertical calibration through the bubble type spirit level. The signal is then ready to be sampled at a computer connected to the data acquisition device. The hammer rod is lifted to a certain scale, then the hammer rod is loosened to enable the hammer rod to fall freely, the hammer rod is grasped after the hammer rebounds, secondary hammering is prevented, and in the hammering process, a sensor records a force signal of the hammer and transmits the force signal to external data acquisition equipment.

It will be appreciated by those skilled in the art that the foregoing types of applications are merely exemplary, and that other types of applications, whether presently existing or later to be developed, that may be suitable for use with the embodiments of the present invention, are also intended to be encompassed within the scope of the present invention and are hereby incorporated by reference.

It will be appreciated by those skilled in the art that the number of various components shown in FIG. 1 for simplicity only may be less than that of an actual device, but such omissions are clearly not to be considered as a complete disclosure without affecting the clarity of the embodiments of the invention.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An apparatus for applying impact excitations inside the earth layers of a laboratory flask, comprising: the device comprises a sleeve, a drill bit, a hammer rod, a hammer body, a hammer head and a sensor;

2. The apparatus of claim 1, wherein the casing is a straight seamless steel tube.

3. The apparatus of claim 1, wherein the sleeve is threadably connected to the top of the casing and the drill bit is threadably connected to the bottom of the casing.

4. The apparatus of claim 1, wherein the drill bit is a 90 ° cone.

5. The device of claim 1, wherein the hammer rod is a steel graduated tube.

6. The device as claimed in claim 1, wherein the hammer body is a cylindrical steel block, and the hammer head is made of nylon or rubber and is fixed at the lowest end of the hammer rod through threaded connection.

7. The device of claim 1, wherein the sensor is a 108a010 type force sensor; the hammer is connected to a data acquisition instrument through an L5-BNC type data acquisition line to record signals of the force applied by the hammer body.

8. The device of claim 1, further comprising radial arms mounted on either side of the sleeve for increasing the moment arm to apply torque.