CN218917050U

CN218917050U - Device for testing longitudinal wave velocity of grouting material under multi-field coupling effect

Info

Publication number: CN218917050U
Application number: CN202222881247.1U
Authority: CN
Inventors: 王振扬; 王甫; 刘鹏飞; 张凯; 张博; 廖艳鹤; 孙秀凯; 张德明; 张毓; 牛帅; 宛云杰; 刘洋洋
Original assignee: MCC Capital Engineering and Research Incorporation Ltd
Current assignee: MCC Capital Engineering and Research Incorporation Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-04-25
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses a testing device for longitudinal wave velocity of grouting material under the action of multi-field coupling, which relates to the technical field of grouting repair, and comprises: a shell with an inner cavity, wherein the shell is provided with an opening, and the opening is provided with internal threads; load simulation unit, comprising: the device comprises a lower supporting mechanism arranged at the bottom of a shell, an upper supporting mechanism arranged in the shell, a force transmission piece with external threads, a pressure sensor and a pressure sensor, wherein the force transmission piece is screwed in an opening and can press the upper supporting mechanism; etc. The method and the device can solve the problem that the longitudinal wave speed change rule of the grouting material cannot be tested under the condition of not interrupting the multi-field coupling simulation test.

Description

Device for testing longitudinal wave velocity of grouting material under multi-field coupling effect

Technical Field

The utility model relates to the technical field of grouting repair, in particular to a device for testing longitudinal wave velocity of a grouting material under the action of multi-field coupling.

Background

Basic engineering construction in China is in progress, a large number of engineering is lost over time, and reinforcement and danger removal are needed. The grouting repairing technology is to inject grouting material into a defect area under the action of pressure, and achieve the purpose of repairing and reinforcing after curing and solidification, and is widely applied to the field of repairing and reinforcing of foundation engineering such as roads, water conservancy and the like at present. Considering that the real service environment of the grouting material is complex and changeable, and the durability characteristic of the grouting material is related to the use safety and service life of the foundation engineering, the damage evolution characteristic of the grouting material under the action of multi-field coupling is explored, and the method has important theoretical significance for the safety evaluation of the foundation engineering after grouting repair.

The longitudinal wave velocity is very sensitive to the microstructure surface of the grouting material, and the change of the longitudinal wave velocity can directly reflect the change rule of micro cracks in the grouting material and represent the damage degree of the grouting material. The existing test device can only better simulate the actual environment of grouting materials. However, at present, for the change rule of the longitudinal wave velocity of the grouting material under the action of multi-field coupling, a method of firstly performing multi-field coupling simulation test, then taking out a sample from a test device and then testing the longitudinal wave velocity can be generally adopted, and the main problems are as follows: 1. the test device and the method cannot test the change rule of the longitudinal wave velocity of the grouting material under the condition of not interrupting the multi-field coupling simulation test; 2. the method cannot test the continuous change rule of the longitudinal wave velocity in any time period. In addition, considering that the placement positions of the probes of the longitudinal wave velocity tester and the adhesion degree of the probes and the samples in different testing stages have slight differences, the test results of the conventional device in the longitudinal wave velocity cannot avoid certain deviation.

Disclosure of Invention

In order to overcome the defects in the prior art, the technical problem to be solved by the embodiment of the utility model is to provide a device for testing the longitudinal wave velocity of the grouting material under the action of multi-field coupling, which can solve the problem that the change rule of the longitudinal wave velocity of the grouting material cannot be tested under the condition of not interrupting a multi-field coupling simulation test.

The specific technical scheme of the embodiment of the utility model is as follows:

the device for testing the longitudinal wave velocity of the grouting material under the action of multi-field coupling comprises:

a housing having an interior cavity, the housing having an opening therein, the opening having internal threads;

load simulation unit, comprising: the device comprises a shell, a lower supporting mechanism arranged at the bottom of the shell, an upper supporting mechanism arranged in the shell, and a force transmission piece with external threads, wherein the force transmission piece is screwed in the opening and can press the upper supporting mechanism, the force transmission piece is provided with an operation part positioned outside the shell, a grouting material sample is clamped between the upper supporting mechanism and the lower supporting mechanism, and a pressure sensor for testing the pressure applied to the grouting material sample is arranged on the upper supporting mechanism or the lower supporting mechanism;

an environmental simulation unit comprising: pressure measuring means for testing the pressure within said housing; an openable water inlet pipeline communicated with the inner cavity of the shell; an openable water outlet pipeline communicated with the inner cavity of the shell;

a temperature adjusting unit for adjusting a temperature within the housing;

a wave speed test unit comprising: a tube inserted into the housing; the sealing film is arranged at one end of the pipe body extending into the shell, and a gate which can be opened and closed and can seal the pipe body is arranged at the other end of the pipe body; the wave speed test probe is arranged in the pipe body and can be clung to the film, and then is clung to the side wall of the grouting material sample through the film.

Preferably, the film comprises an HDPE film.

Preferably, the film is wrapped around the end of the tube and at least partially covers the outer side wall of the tube, and the film at the outer side wall of the tube is wound with a coil, thereby sealing the end of the tube.

Preferably, the inner side wall of the pipe body is provided with a flexible layer capable of fixing the wave speed test probe.

Preferably, the axis of the tube intersects the center of the grouting material sample.

Preferably, the lower support mechanism includes: the device comprises a base and a lower cushion block arranged on the base; the upper supporting mechanism comprises an upper cushion block; the lower cushion block and the upper cushion block are used for clamping the grouting material sample;

the temperature adjustment unit includes: an electric heating element arranged on the base;

the side wall of the base is tightly attached to the inner side wall of the shell, the pressure sensor is arranged on the upper surface of the lower cushion block, and a data line inlet and outlet hole is formed in the side wall, which is tightly attached to the base, of the shell;

a first data line channel is formed in the lower cushion block and extends from the upper surface to the lower surface of the lower cushion block; a second data line channel is formed in the base, and extends from the upper surface of the base, which is in contact with the lower cushion block, to the side wall, which is closely attached to the inner side wall of the shell; a third data line channel is formed in the base, and extends from the upper surface of the base, which is in contact with the electric heating element, to the side wall, which is closely attached to the inner side wall of the shell;

the device for testing the longitudinal wave velocity of the grouting material under the action of multi-field coupling further comprises: the control unit is electrically connected with the pressure sensor through a first data line, is electrically connected with the electric heating element through a second data line and is electrically connected with the wave speed test probe through a third data line; the first data line is arranged in the data line access hole, the first data line channel and the second data line channel in a penetrating manner, and the second data line is arranged in the data line access hole and the third data line channel in a penetrating manner; the third data line enters the pipe body through the gate and is electrically connected with the wave speed test probe.

Preferably, the housing comprises: the body is provided with a top wall, and the top wall is provided with a mounting opening; install the lid of installing the department, the size of installing the mouth is greater than slip casting material sample, the department of installing the mouth has first step, the lateral wall department of lid has with first step matched with second step, the second step of lid with behind the first step of installing the mouth cooperate through running through first step with bolt and the nut of second step fasten, thereby realize the lid with can dismantle sealed installation between the body.

Preferably, the pressure measuring device is arranged on the water inlet pipeline or the water outlet pipeline.

The technical scheme of the utility model has the following remarkable beneficial effects:

according to the device and the method for testing the longitudinal wave velocity of the grouting material under the multi-field coupling effect, various complex environments possibly encountered by the grouting material in the service process are simulated through the load simulation unit, the environment simulation unit and the temperature regulation unit, and the longitudinal wave velocity change data of the grouting material sample in any time period in the process of applying the pressure load to the grouting material sample through the load simulation unit can be directly monitored through the wave velocity testing unit installed on the shell under the condition of not interrupting the multi-field coupling simulation test. Secondly, the structure of the wave speed testing unit can avoid fine deviation caused by different placement positions of the wave speed testing probe and different adhesion degrees of the wave speed testing probe and the sample.

Specific embodiments of the utility model are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the utility model may be employed. It should be understood that the embodiments of the utility model are not limited in scope thereby. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present utility model, and are not particularly limited. Those skilled in the art with access to the teachings of the present utility model can select a variety of possible shapes and scale sizes to practice the present utility model as the case may be.

FIG. 1 is a front view of a device for testing the longitudinal wave velocity of a grouting material under the action of multi-field coupling in an embodiment of the utility model;

FIG. 2 is a side view of a device for testing the longitudinal wave velocity of a grouting material under the action of multi-field coupling in an embodiment of the utility model;

FIG. 3 is a schematic view of the structure of the mounting portion of the body and the cover of the housing according to the embodiment of the utility model;

fig. 4 is a schematic structural diagram of a waveguide test probe according to an embodiment of the present utility model.

Reference numerals of the above drawings:

1. a housing; 11. a body; 111. a mounting port; 1111. a first step; 12. a cover body; 121. a second step; 13. opening holes; 14. a bolt; 15. a nut; 21. a lower support mechanism; 211. a base; 212. a lower cushion block; 22. an upper support mechanism; 23. a force transmitting member; 231. an operation unit; 24. a pressure sensor; 3. grouting a material sample; 41. a pressure measuring device; 42. a water inlet pipeline; 421. a first opening/closing valve; 43. a water outlet pipeline; 431. a second opening/closing valve; 5. a temperature adjusting unit; 61. a tube body; 611. a flexible layer; 62. a film; 63. a gate; 631. a gate handle; 64. a wave speed test probe; 65. a coil; 7. a control unit; 71. a first data line; 72. a second data line; 73. and a third data line.

Detailed Description

The details of the utility model will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the utility model. However, the specific embodiments of the utility model described herein are for the purpose of illustration only and are not to be construed as limiting the utility model in any way. Given the teachings of the present utility model, one of ordinary skill in the related art will contemplate any possible modification based on the present utility model, and such should be considered to be within the scope of the present utility model. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In order to solve the problem that the change rule of the longitudinal wave velocity of the grouting material cannot be tested under the condition of not interrupting the multi-field coupling simulation test, a testing device for the longitudinal wave velocity of the grouting material under the multi-field coupling effect is provided in the present application, fig. 1 is a front view of the testing device for the longitudinal wave velocity of the grouting material under the multi-field coupling effect in the embodiment of the present utility model, fig. 2 is a side view of the testing device for the longitudinal wave velocity of the grouting material under the multi-field coupling effect in the embodiment of the present utility model, fig. 4 is a schematic structural diagram of the mounting part of the probe for the longitudinal wave velocity measurement in the embodiment of the present utility model, as shown in fig. 1, fig. 2 and fig. 4, the testing device for the longitudinal wave velocity of the grouting material under the multi-field coupling effect may include: a shell 1 with an inner cavity, wherein an opening 13 is formed in the shell 1, and the opening 13 is provided with an internal thread; load simulation unit, comprising: the device comprises a lower supporting mechanism 21 arranged at the bottom of the shell 1, an upper supporting mechanism 22 arranged in the shell 1, a force transmission piece 23 with external threads, wherein the force transmission piece 23 is screwed in the opening 13 and can press the upper supporting mechanism 22, the force transmission piece 23 is provided with an operation part 231 positioned outside the shell 1, the upper supporting mechanism 22 and the lower supporting mechanism 21 are used for clamping a grouting material sample 3, and the upper supporting mechanism 22 or the lower supporting mechanism 21 is provided with a pressure sensor 24 for testing the pressure applied to the grouting material sample 3; an environmental simulation unit comprising: a pressure measuring device 41 for testing the pressure in the housing 1; an openable and closable water inlet pipe 42 communicating with the inner cavity of the casing 1; an openable and closable water outlet pipe 43 communicating with the inner cavity of the casing 1; a temperature adjusting unit 5 for adjusting the temperature inside the housing 1; a wave speed test unit comprising: a tube 61 inserted into the housing 1; a closing film 62 is provided on one end of the pipe body 61 extending into the housing 1, and a shutter 63 capable of opening and closing and sealing the pipe body 61 is provided on the other end of the pipe body 61; a wave velocity test probe 64 provided in the pipe body 61 and capable of being brought into close contact with the film 62, and further being brought into close contact with the side wall of the grouting material sample 3 via the film 62.

According to the testing device for the longitudinal wave velocity of the grouting material under the multi-field coupling effect, the longitudinal wave velocity change rule of the grouting material can be tested under the condition of not interrupting a multi-field coupling simulation test through the wave velocity testing unit installed in the pipe body 61 of the shell 1.

As shown in fig. 1, the housing 1 has an interior cavity therein capable of accommodating a part load simulator unit and a grouting material sample 3. The housing 1 may comprise a top wall, a bottom wall and side walls forming an inner cavity. In order to enable the grouting material sample 3 to be installed into the cavity, the housing 1 may comprise: a body 11, the body 11 having a top wall with a mounting opening 111 thereon; a cover 12 mounted at the mounting opening 111, the cover 12 also forming part of the top wall of the housing 1. The cover 12 is detachably connected with the mounting opening 111 of the body 11. The size of the mounting opening 111 is larger than that of the grouting material sample 3, so that the grouting material sample 3 can be smoothly mounted into the housing 1 when the cover 12 on the mounting opening 111 is detached.

In order to ensure the air tightness between the cover 12 and the body 11 after being mounted together, fig. 3 is a schematic structural diagram of the mounting position of the body and the cover of the case according to the embodiment of the present utility model, as shown in fig. 3, the mounting opening 111 is provided with a first step 1111, the sidewall of the cover 12 is provided with a second step 121 matched with the first step 1111, and the second step 121 of the cover 12 is fastened by a bolt 14 and a nut 15 penetrating the first step 1111 and the second step 121 after being matched with the first step 1111 of the mounting opening 111. A plurality of bolts 14 and nuts 15 may be arranged in the circumferential direction of the cover 12, thereby achieving locking between the cover 12 and the body 11 so as to maintain a seal therebetween. A sealing ring may be provided on a horizontal end surface between the first step 1111 and the second step 121, thereby further securing sealability.

As shown in fig. 1, the body 11 has an opening 13 therein, and the opening 13 may be provided on the cover 12. The inside wall of the opening 13 has an internal thread. The opening 13 allows the force-transmitting member 23 to be screwed into the interior of the housing 1. The load simulation unit may include: a lower support mechanism 21 arranged at the bottom of the housing 1, an upper support mechanism 22 arranged in the housing 1, and a force transmission member 23 with external threads. The force-transmitting member 23 is screwed into the opening 13 by external threads and is capable of pressing the upper support mechanism 22, e.g. the lower end of the force-transmitting member 23 may abut the upper support mechanism 22 or be connected to the upper support mechanism 22. The force-transmitting member 23 has an operation portion 231 located outside the housing 1, the operation portion 231 allowing an operator to rotate the force-transmitting member 23 so that the force-transmitting member 23 can move in the vertical direction while maintaining tightness between the force-transmitting member 23 and the housing 1 by threads. The upper support means 22 and the lower support means 21 are arranged to hold the grouting material sample 3 therebetween and to apply a variable load to the grouting material sample 3 by means of the force-transmitting member 23. The upper support mechanism 22 or the lower support mechanism 21 is provided with a pressure sensor 24 for measuring the pressure applied to the grouting material specimen 3. The pressure sensor 24 is used to make the operator aware of the amount of pressure that is specifically applied to the grouting material sample 3 after turning the force-transmitting member 23.

As a possibility, as shown in fig. 1 and 2, the lower support mechanism 21 may include: a base 211, a lower pad 212 provided on the base 211; the upper support mechanism 22 includes an upper pad. The base 211 may be provided on the bottom wall of the housing 1, and a portion of the side wall of the base 211 may be closely attached to the inner side wall of the base 211. The lower spacer 212 and the upper spacer are used for clamping the grouting material sample 3. The pressure sensor 24 may be disposed on the upper surface of the lower pad 212 or the lower surface of the upper pad. The lower pad 212 may have a recess on its upper surface, and the lower end of the grouting material sample 3 may be mounted in the recess, so as to avoid the position of the grouting material sample 3 from being deviated in the horizontal direction, and facilitate the attachment of the wave velocity test probe 64 of the later wave velocity test unit to the side wall of the grouting material sample 3. The bottom of the recess is as flat as possible and the pressure sensor 24 may be arranged at the bottom of the recess. The upper pad may be a regular cube with its lower end face as flat as possible to uniformly apply a compressive load to the grouting material specimen 3.

As shown in fig. 1 and 2, the environment simulation unit may include: a pressure measuring device 41 for testing the pressure in the housing 1; an openable and closable water inlet pipe 42 communicating with the inner cavity of the casing 1; an openable and closable water outlet pipe 43 communicating with the inner cavity of the casing 1. The water inlet pipe 42 may be connected to an upper portion of the housing 1, and a first opening/closing valve 421 is provided on the water inlet pipe 42 to control the on/off of the water inlet pipe 42. The water outlet line 43 may be connected to the bottom of the housing 1 so as to be able to completely discharge the liquid in the housing 1. The water outlet pipe 43 is provided with a second opening/closing valve 431 for controlling the opening/closing of the water outlet pipe 43. The pressure measuring device 41 may be in communication with the interior of the housing 1, for example, the pressure measuring device 41 may be a pressure gauge, which may be provided on the water inlet line 42 or the water outlet line 43, thus facilitating the installation of the pressure measuring device 41. The solution required for the test can be injected into the inside of the housing 1 through the water inlet line 42, and in addition, the pressure in the housing 1 can be controlled by the amount of the solution required for the injection test.

The temperature adjusting unit 5 is used to adjust the temperature inside the housing 1. As a possibility, the temperature regulating unit 5 may comprise an electric heating element arranged inside the housing 1. For example, an electric heating element may be provided on the base 211.

As shown in fig. 1 to 3, the wave speed test unit may include: a tube 61 inserted into the housing 1; a closing film 62 is provided on one end of the pipe body 61 extending into the housing 1, and a shutter 63 capable of opening and closing and sealing the pipe body 61 is provided on the other end of the pipe body 61; a wave velocity test probe 64 disposed in the tube 61 and capable of being brought into close contact with the film 62. The pipe body 61 and the housing 1 are connected in a sealing manner, for example, the pipe body 61 and the housing 1 may be both made of metal materials and connected in a sealing manner by welding. The end of the tube 61 extending into the housing 1 is closed by the membrane 62, which is capable of small movements in the radial direction of the housing 1, since the membrane 62 covering the end of the tube 61 may have a certain margin. When the wave speed test probe 64 is tightly attached to the film 62, the wave speed test probe 64 can still stretch and retract to a certain extent in the radial direction of the casing 1, and the wave speed test probe 64 can be moved through the stretch and retract, so that the wave speed test probe 64 is tightly attached to the side wall of the grouting material sample 3 through the film 62, and the wave speed test probe 64 can monitor the longitudinal wave speed of the grouting material sample 3. After the wave speed test probe 64 in the pipe body 61 is adjusted to be tightly attached to the side wall of the grouting material sample 3 through the film 62, the other end of the pipe body 61 can be sealed through the gate 63, so that damage to the film 62 after the pressure in the later-stage housing 1 is increased is avoided. The shutter 63 may be provided with a shutter handle 631 for facilitating the opening and closing of the shutter 63. In order to prevent the solution in the housing 1 from passing through the membrane 62 into the permeate tube 61, the membrane 62 may comprise a HDPE membrane 62 which has a strong permeation prevention effect and also has a certain elongation, and even after the pressure in the housing 1 is increased later, the membrane 62 may be elongated to prevent it from being directly broken to cause the solution to enter the tube 61.

As a possibility, as shown in fig. 4, a film 62 may be wrapped around the end of the tube 61 and at least partially cover the outer side wall of the tube 61, and the film 62 at the outer side wall of the tube 61 is wound by a coil 65, thereby sealing the end of the tube 61. This way, the sealing of the end of the pipe body 61 can be realized simply and quickly, and the film 62 is not damaged.

The inner side wall of the tube body 61 has a flexible layer 611 capable of fixing the wave speed test probe 64. The flexible layer 611 is made of a flexible material with a certain elasticity, and the flexible layer 611 may be made of a rubber material, which has an inner diameter slightly smaller than the outer diameter of the wave speed test probe 64. Thus, the flexible layer 611 may still allow the wave speed test probe 64 to pass through by collapsing, but there is a greater frictional resistance between the flexible layer 611 and the side walls of the wave speed test probe 64. After the wave speed test probe 64 is tightly attached to the side wall of the grouting material sample 3 through the film 62, the wave speed test probe 64 cannot be easily moved backwards due to friction resistance between the flexible layer 611 and the side wall of the wave speed test probe 64, so that fixation is achieved, and the wave speed test probe 64 can be always kept tightly attached to the side wall of the grouting material sample 3 through the film 62. In addition, when the operator adjusts, only the wave speed test probe 64 is needed to be pressed inwards by hand, so that the wave speed test probe 64 is convenient and quick to push inwards without using other tools. After the end of the post-test, when the grouting material sample 3 is taken out, the grouting material sample 3 is moved outward by a small amount in the radial direction, so that the wave speed test probe 64 can be moved backward, and the grouting material sample 3 is taken out without damaging the film 62 at the time of taking out.

As shown in fig. 1, the number of wave speed test units may be two, and the two wave speed test units are symmetrically arranged on the side wall of the casing 1. In order to make the longitudinal wave velocity of the grouting material sample 3 collected by the wave velocity test probe 64 in the pipe body 61 more accurate, the axis of the pipe body 61 intersects with the center of the grouting material sample 3 so that the wave velocity test probe 64 can face the center of the grouting material sample 3.

As shown in fig. 1, the device for testing the longitudinal wave velocity of the grouting material under the action of multi-field coupling can comprise: the control unit 7 is electrically connected to the pressure sensor 24 via a first data line 71, to the electric heater via a second data line 72, and to the wave speed test probe 64 via a third data line 73. In order to achieve the electrical connection of the individual data lines to the corresponding devices, in particular parts of the devices are located inside the housing 1 for receiving the solution, it is necessary to avoid short-circuits of the individual data lines during the laying process. A data line inlet and outlet hole is formed on the side wall which is close to the base 211 and is close to the shell 1. The lower pad 212 has a first data line 71 extending from the upper surface to the lower surface of the lower pad 212. The second data line 72 is formed in the base 211, and extends from the upper surface of the base 211 contacting the lower pad 212 to the side wall closely contacting the inner side wall of the housing 1. A third data line 73 channel is formed in the base 211, and extends from the upper surface of the base 211, which is in contact with the electric heating element, to the side wall, which is in close contact with the inner side wall of the casing 1. The first data line 71 is arranged in the data line access hole, the first data line 71 channel and the second data line 72 channel in a penetrating way, and the second data line 72 is arranged in the data line access hole and the third data line 73 channel in a penetrating way. The third data line 73 enters the pipe body 61 through the gate 63 and is electrically connected with the wave speed test probe 64. Through the mode, each data wire can be arranged in the base 211 or the lower cushion block 212 in a penetrating mode, the data wires are prevented from leaking out to be contacted with the solution in the shell 1, and the possibility of short circuit in the later period is reduced.

The method for testing the longitudinal wave velocity of the grouting material under the multi-field coupling effect by adopting the device for testing the longitudinal wave velocity of the grouting material under the multi-field coupling effect can be as follows:

the grouting material specimen 3 is installed in the housing 1 so as to be located between the lower support mechanism 21 and the upper support mechanism 22.

In this step, a cubic block of the grouting material sample 3 having a uniform texture was prepared. The bolt 14 between the body 11 of the housing 1 and the cover 12 is then unscrewed, so that the cover 12 is opened, and the force-transmitting member 23 screwed onto the cover 12 is removed. The grouting material sample 3 is mounted in the concave groove of the lower pad 212. The upper pad is placed on the upper surface of the grouting material specimen 3. After that, the cover 12 is fastened, and the bolts 14 between the body 11 and the cover 12 of the housing 1 are installed, and the seal between the body 11 and the cover 12 is ensured.

After the grouting material sample 3 is mounted in the casing 1, the water outlet pipe 43 may be closed, gas may be injected into the casing 1 through the water inlet pipe 42, and after a certain pressure is reached, the injection of gas may be stopped and the water inlet pipe 42 may be closed. After that, it is observed whether the pressure of the pressure measuring device 41 is gradually lowered, thereby checking the air tightness in the housing 1.

The solution required for the test is injected into the housing 1 through the water inlet line 42 so that the amount of the solution required for the test in the housing 1 and the pressure in the housing 1 reach the pressure required for the test.

In the above steps, after the grouting material sample 3 is installed in the casing 1, and the air tightness in the casing 1 meets the requirement, the solution required by the test is injected into the casing 1 through the water inlet pipeline 42, meanwhile, the water depth and the pressure measuring device 41 in the inner cavity of the casing 1 are observed, and after the water depth and/or the water pressure in the inner cavity of the casing 1 reach the pressure requirement required by the test, the water inlet pipeline 42 is closed.

After the pressure in the housing 1 reaches the pressure requirement required for the test, the temperature in the housing 1 is adjusted to the temperature requirement required for the test by the temperature adjusting unit 5.

In the process of adjusting the temperature in the shell 1 to the temperature requirement required by the test and the water pressure in the cavity to the pressure requirement required by the test, the gas and the solution in the shell 1 expand with heat and contract with cold, so that the pressure change is caused, meanwhile, the pressure change in the shell 1 is caused in the process of adjusting the water pressure in the cavity, and the pressure in the shell 1 acts on the film 62 in the wave speed test unit.

After the temperature in the housing 1 is adjusted to the temperature required for the test, the shutter 63 is opened, the wave velocity test probe 64 in the pipe body 61 is closely attached to the side wall of the grouting material sample 3 through the film 62, and then the shutter 63 is closed to seal the pipe body 61.

In the above step, since the film 62 covered at the end of the tube body 61 may have a certain margin, it can be moved in the radial direction of the housing 1 by a small margin. When a gap is formed between the end of the pipe body 61 and the grouting material sample 3, the wave speed test probe 64 can be tightly attached to the side wall of the grouting material sample 3 through the thin film 62 by the small-amplitude movement, so that the wave speed test probe 64 can be isolated from the solution in the shell 1, and the wave speed of the longitudinal wave of the grouting material sample 3 can be monitored by the wave speed test probe 64. The shutter 63 is then closed to seal the tube 61.

After the wave speed test probe 64 is installed, the force transmission piece 23 is rotated outside the shell 1, and the pressure sensor 24 is matched to adjust the pressure between the lower supporting mechanism 21 and the upper supporting mechanism 22 to the pressure required to be carried by the grouting material sample 3 test, and during the period, the wave speed of the longitudinal wave of the grouting material sample 3 is monitored and recorded in real time through the wave speed test probe 64.

The pressure exerted on the grouting material sample 3 can then also be varied by the force-transmitting member 23 and/or the temperature in the housing 1 can be varied by the temperature regulating unit 5 and/or the pressure in the housing 1 and the amount of solution in the housing 1 can be varied by the water inlet line 42, during which the longitudinal wave velocity of the grouting material sample 3 can be monitored and recorded in real time by the wave velocity test probe 64. Since the tube 61 is sealed, the pressure of the gas in the tube 61 can be ensured, and even if the temperature in the housing 1 is changed later to increase the pressure in the housing 1 or the solution is supplemented through the water inlet pipeline 42 to increase the pressure in the housing 1, the pressure of the gas isolated by the film 62 in the tube 61 is correspondingly increased after being compressed, so that the pressure is balanced with the pressure in the housing 1. When the pressure of the gas isolated by the film 62 in the tube 61 is compressed, the film 62 is biased outwards when the gas volume of the tube 61 is reduced because the film 62 covered at the end of the tube 61 may have a certain margin; even when the gas volume of the tube body 61 is excessively reduced, the film 62 may be deformed by stretching to satisfy the amount by which the film 62 is outwardly biased.

According to the device and the method for testing the longitudinal wave velocity of the grouting material under the multi-field coupling effect, various complex environments possibly encountered by the grouting material in the service process are simulated through the load simulation unit, the environment simulation unit and the temperature regulation unit 5, and the longitudinal wave velocity change data of the grouting material sample 3 in any time period in the process of applying the pressure load to the grouting material sample 3 through the load simulation unit can be directly monitored through the wave velocity testing unit installed on the shell 1 under the condition of not interrupting the multi-field coupling simulation test. Second, the structure of the wave speed test unit can avoid fine deviation due to the difference in the placement position of the wave speed test probe 64 and the degree of adhesion to the sample. In addition, the condition parameters of each coupling can be changed continuously in the later period, and during the period of changing the condition parameters of each coupling, the wave speed test probe 64 can be made to be always clung to the grouting material sample 3 by utilizing the wave speed test unit, and meanwhile, the integrity of the film 62 can be ensured, so that the solution is prevented from entering the pipe body 61. The longitudinal wave velocity change data of the grouting material sample 3 can be monitored by using a wave velocity test unit while changing the respective coupling parameters. The obtained longitudinal wave velocity change data of the grouting material sample 3 under each coupling condition parameter can provide a theoretical basis for the safety evaluation of the foundation engineering after grouting repair.

All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional. Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims

1. The device for testing the longitudinal wave velocity of the grouting material under the action of multi-field coupling is characterized by comprising the following components:

a temperature adjusting unit for adjusting a temperature within the housing;

2. The apparatus for testing longitudinal wave velocity of grouting material under multi-field coupling according to claim 1, wherein the film comprises HDPE film.

3. The device for testing longitudinal wave velocity of grouting material under multi-field coupling according to claim 2, wherein the film is wrapped at the end of the pipe body and at least partially covers the outer side wall of the pipe body, and the film at the outer side wall of the pipe body is wound by a coil, so that the end of the pipe body is sealed.

4. The device for testing the longitudinal wave velocity of grouting material under the action of multi-field coupling according to claim 1, wherein the inner side wall of the pipe body is provided with a flexible layer capable of fixing the wave velocity testing probe.

5. The device for testing the longitudinal wave velocity of grouting material under the action of multi-field coupling according to claim 1, wherein the axis of the pipe body is intersected with the center of the grouting material sample.

6. The device for testing the longitudinal wave velocity of grouting material under the action of multi-field coupling according to claim 1, wherein the lower supporting mechanism comprises: the device comprises a base and a lower cushion block arranged on the base; the upper supporting mechanism comprises an upper cushion block; the lower cushion block and the upper cushion block are used for clamping the grouting material sample;

7. The device for testing the longitudinal wave velocity of grouting material under the action of multi-field coupling according to claim 1, wherein the shell comprises: the body is provided with a top wall, and the top wall is provided with a mounting opening; install the lid of installing the department, the size of installing the mouth is greater than slip casting material sample, the department of installing the mouth has first step, the lateral wall department of lid has with first step matched with second step, the second step of lid with behind the first step of installing the mouth cooperate through running through first step with bolt and the nut of second step fasten, thereby realize the lid with can dismantle sealed installation between the body.

8. The device for testing the longitudinal wave velocity of grouting materials under the action of multi-field coupling according to claim 1, wherein the pressure measuring device is arranged on the water inlet pipeline or the water outlet pipeline.