A force monitoring device and monitoring method for a model test box used in civil engineering

Abstract

The present invention discloses a force monitoring device and a monitoring method for a model test box in civil engineering, including a box body, on which a force measuring plate, a sealing strip, a right connecting device, a bottom beam and a left connecting device are provided. Horizontal and vertical sealing strips are provided between the force measuring plates on adjacent sides. The front plate of the force measuring plate in the force measuring plate is connected to the bottom beam bracket on the bottom beam. The right connecting device bracket in the right connecting device is connected to the front plate of the force measuring plate. The left connecting device bracket in the left connecting device contacts the tangential force measuring sensor and the tangential fixing bracket fixed at the groove of the front plate of the force measuring plate; the L-shaped connecting plate in the left connecting device is connected to the sealing strip. By adopting the above force monitoring device and monitoring method for a model test box in civil engineering, the purpose of monitoring the normal and tangential force magnitudes at any position on the side of the model box during the model test loading process is achieved by reading the readings of the normal force measuring sensors and the tangential force measuring sensors on each force measuring plate.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and particularly to a stress monitoring device and method for a model test box used in civil engineering. Background Art

[0002] In fields such as geotechnical engineering and structural engineering, physical model tests are an effective method for studying the interaction mechanism among landslides - prevention and control projects - railway projects. When designing the test, a suitable research area is usually selected around the prevention and control structures and railway projects in the landslide prototype. The length direction is parallel to the main sliding direction, and the width direction is perpendicular to the main sliding direction. The area range in the main sliding direction is selected at a certain interface behind prevention and control structures such as anti-slide piles, and this interface is regarded as the stress or displacement boundary. Based on the relevant information of the landslide prototype and the similarity criterion, an experimental model is established and the magnitude and distribution of stress or displacement on this boundary are determined. In the test, a push plate loading method is used to replace the omitted sliding mass behind this interface, so as to obtain the stress and deformation characteristics of the prevention and control structures and railway engineering structures under the action of landslide thrust, providing a reference for structural design.

[0003] In existing research, the side surface of the landslide model test box (i.e., the boundary in the above-mentioned width direction) usually adopts methods such as setting an epoxy resin coating to reduce friction, but its specific stress boundary conditions are unknown. This is not only inconvenient for corresponding modification of the model in subsequent test data analysis, but also inconvenient for monitoring the stress condition of the test box body to ensure the safe progress of the test. Summary of the Invention

[0004] The purpose of the present invention is to provide a stress monitoring device and method for a model test box used in civil engineering. By setting multiple force - measuring plates fixed on the box body, and reading the readings of the normal force - measuring sensors and tangential force - measuring sensors on each force - measuring plate, the purpose of monitoring the normal and tangential force magnitudes at any position on the side surface of the model box during the model test loading process is achieved.

[0005] The present invention provides a stress monitoring device and method for a model test box used in civil engineering, including a box body. The box body is provided with force - measuring plates, sealing strips, a right - hand connection device, a bottom beam, and a left - hand connection device. Horizontal and vertical sealing strips are arranged between the force - measuring plates. The front force - measuring plate in the force - measuring plates is connected to the bottom beam bracket on the bottom beam. The right - hand connection device bracket in the right - hand connection device is connected to the front force - measuring plate. The left - hand connection device bracket in the left - hand connection device contacts the tangential force - measuring sensor and tangential fixing bracket fixed at the groove of the front force - measuring plate. The L - shaped connecting plate in the left - hand connection device is connected to the sealing strip.

[0006] Preferably, the force plate includes a force plate front plate, a normal force measuring device and a force plate back plate. The left side of the force plate front plate is provided with four grooves for fixing the force sensor and the tangential fixing bracket respectively. The tangential fixing bracket connects the adjacent force plate front plates through screws. The force plate front plate slides along the tangential fixing bracket. The lower side of the force plate front plate is provided with two grooves for fixing two groups of vertical fixing brackets. The back side of the force plate front plate is connected to five groups of normal force measuring devices, and the normal force measuring device is connected and fixed to the back plate of the force plate.

[0007] Preferably, the normal measurement device includes an adapter, a normal force sensor and a sensor bracket, the normal force sensor is connected to the front plate of the force plate through the adapter, and the normal force sensor is connected to the back plate of the force plate through the sensor bracket; the back plate of the force plate includes a bolt sleeve, a steel plate and steel bars, the bolt sleeve is pre-embedded in the side of the box, the bolts inside the bolt sleeve are welded to the steel plate, grouting is performed between the steel plate and the side of the box, and horizontal and vertical steel bars are welded to the back of the steel plate.

[0008] Preferably, the right connecting device comprises a right connecting device embedded part and a right connecting device bracket connected to form a right connecting device embedded part, and the right connecting device bracket is connected and fixed to the right connecting device embedded part embedded in the bending section of the box body.

[0009] Preferably, the bottom beam includes a bottom beam embedded part, a steel rail, a slide, a limit device and a bottom beam bracket. The bottom beam is composed of several sections of steel rails. The bottom of the bottom beam is fixed to the bottom beam embedded part embedded in the box floor by studs. A slide is set on the top of the steel rail. The bottom beam bracket is set at the top of the slide and moves along the slide. Limit devices are provided on both sides of the bottom beam bracket.

[0010] Preferably, the left connecting device comprises a left connecting device embedded part, a left connecting device bracket and an L-shaped connecting plate, and the left connecting device bracket is connected and fixed to the left connecting device embedded part of the bending section embedded in the box body.

[0011] Preferably, step S1, reading the normal force sensor readings and summing them up to determine the force magnitude;

[0012] During the model test loading process, the readings of the five normal force sensors in each force plate are read and summed, which is recorded as F n , the force in the direction perpendicular to the plate surface in the area covered by the force plate is F n ;

[0013] Step S2, reading the readings of the tangential force sensor of the force plate, summing them, and reading the readings of the tangential force sensor of the adjacent force plate on the right side of the force plate and summing them;

[0014] Read the readings of the two tangential force sensors of each force plate and sum them up, recorded as Ft1， Read the readings of two tangential force sensors in the force measuring plate adjacent to the right side of the force measuring plate and sum them up, denoted as F t2 , if there is no adjacent force measuring plate on the right side, it is denoted as 0, and the magnitude of the force on the plane within the coverage area of the force measuring plate along the loading direction is F t1 -[[-END]] F t2 .

[0015] Therefore, the present invention adopts the above-mentioned force monitoring device and monitoring method for a model test box in civil engineering. By setting multiple force measuring plates fixed on the box body and reading the readings of the normal force sensors and tangential force sensors on each force measuring plate, the purpose of monitoring the magnitudes of the normal and tangential forces at any position on the side of the model box during the model test loading process is achieved.

[0016] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention;

[0018] Figure 2 is the structural schematic diagram of the force measuring plate disassembly part after removing the front plate and the sealing strip for a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention;

[0019] Figure 3 is for a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention Figure 2 The enlarged view of part A in the embodiment of the present invention;

[0020] Figure 4 is the structural schematic diagram of the part near the bottom beam after removing the front plate and the sealing strip for a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention;

[0021] Figure 5 is for a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention Figure 4 The enlarged view of part B in the embodiment of the present invention;

[0022] Figure 6 is the top view of a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention near the right side of the box body;

[0023] Figure 7 is the structural schematic diagram of the back side near the right side of the box body for a force monitoring device and monitoring method for a model test box in civil engineering according to the present invention;

[0024] Figure 8 This is a top view of the force monitoring device and monitoring method for a model test box used in civil engineering of the present invention, near the left side of the box body.

[0025] Reference numerals

[0026] 1. Box body; 2. Force measuring plate; 201. Front plate of the force measuring plate; 2011. Tangential force measuring sensor; 2012. Tangential fixing bracket; 2013. Vertical fixing bracket; 202. Normal force measuring device; 2021. Adapter; 2022. Normal force measuring sensor; 2023. Sensor bracket; 203. Back plate of the force measuring plate; 2031. Bolt sleeve; 2032. Steel plate; 2033. Steel bar; 3. Sealing strip; 4. Right side connecting device; 401. Embedded part of the right side connecting device; 402. Bracket of the right side connecting device; 5. Bottom beam; 501. Embedded part of the bottom beam; 502. Rail; 503. Slideway; 504. Limiting device; 505. Bracket of the bottom beam; 6. Left side connecting device; 601. Embedded part of the left side connecting device; 602. Bracket of the left side connecting device; 603. L-shaped connecting plate. Detailed implementation manners

[0027] The technical solutions of the present invention will be further described below with reference to the drawings and embodiments.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs.

[0029] The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] Embodiment 1

[0031] As Figures 1 - 8 shown, a force monitoring device and monitoring method for a model test box used in civil engineering of the present invention includes a box body, and a force measuring plate 2, a sealing strip 3, a right side connecting device 4, a bottom beam 5 and a left side connecting device 6 are arranged on the box body 1; horizontal and vertical sealing strips 3 are arranged between the force measuring plates 2 on adjacent sides; to prevent test materials from entering the gaps between the force measuring plates.

[0032] The force measuring plate 2 includes a front force measuring plate 201, a normal force measuring device 202 and a rear force measuring plate 203. Four grooves are provided on the left side of the front force measuring plate 201 to respectively fix the tangential force measuring sensors 2011 and the tangential fixing brackets 2012. The tangential force measuring sensors 2011 are used to measure the magnitude of the interaction force between adjacent force measuring plates. The tangential fixing brackets 2012 connect the adjacent front force measuring plates 201 by screws to provide guidance and leveling. The front force measuring plate 201 slides along the tangential fixing brackets 2012 to avoid interfering with the measurement of the tangential force measuring sensors 2011. Two grooves are provided on the lower side of the front force measuring plate 201 to fix two groups of vertical fixing brackets 2013; the lower front force measuring plate 201 provides support for the upper front force measuring plate 201 through the vertical fixing brackets 2013 and levels it.

[0033] The back surface of the front force measuring plate 201 of the force measuring plate 2 is connected to five groups of normal force measuring devices 202 to measure the force on the front force measuring plate 201 in the direction perpendicular to the plate surface. The normal force measuring devices 202 are connected and fixed to the rear force measuring plate 203.

[0034] The normal measurement device 202 includes an adapter 2021, a normal force measuring sensor 2022 and a sensor bracket 2023. The normal force measuring sensor 2022 is connected to the front force measuring plate 201 through the adapter 2021. The adapter 2021 can accommodate a certain range of rotational and sliding deformations to avoid interfering with the measurement of the normal force measuring sensor 2022. The normal force measuring sensor 2022 is connected to the rear force measuring plate 203 through the sensor bracket 2023; the sensor bracket 2023 has a leveling function and provides support for the normal force measuring sensor 2022. The rear force measuring plate 203 includes a bolt sleeve 2031, a steel plate 2032 and steel bars 2033. The bolt sleeve 2031 is embedded in the side surface of the box body 1, and the bolt inside the bolt sleeve 2031 is welded to the steel plate 2032 to provide fixation and leveling. Grouting is carried out between the steel plate 2032 and the side surface of the box body 1, and horizontal and vertical steel bars 2033 are welded to the back surface of the steel plate 2032. So that the rear force measuring plate 203 is in closer contact with the grouting material.

[0035] The front force measuring plate 201 in the force measuring plate 2 is connected to the bottom beam bracket 505 on the bottom beam 5. The right connection device bracket 402 in the right connection device 4 is connected to the front force measuring plate 201. The left connection device bracket 602 in the left connection device 6 contacts the tangential force measuring sensors 2011 and the tangential fixing brackets 2012 fixed at the groove of the front force measuring plate 201; the L-shaped connecting plate 603 in the left connection device 6 is connected to the sealing strip 3.

[0036] The right connecting device 4 is composed of a right connecting device embedded part 401 and a right connecting device bracket 402. The right connecting device bracket 402 is fixedly connected to the right connecting device embedded part 401 embedded in the bent section of the box body 1.

[0037] The bottom beam 5 includes a bottom beam embedded part 501, a steel rail 502, a slideway 503, a limiting device 504 and a bottom beam bracket 505. The bottom beam 5 is composed of several sections of steel rails 502 connected together. The bottom of the bottom beam 5 is fixedly connected to the bottom beam embedded part 501 embedded in the ground of the box body 1 by studs. A slideway 503 is arranged on the top of the steel rail 502. The bottom beam bracket 505 is arranged on the top of the slideway 503 and moves along the slideway 503. Limiting devices 504 are arranged on both sides of the bottom beam bracket 505.

[0038] The left connecting device 6 includes a left connecting device embedded part 601, a left connecting device bracket 602 and an L-shaped connecting plate 603. The left connecting device bracket 602 is fixedly connected to the left connecting device embedded part 601 embedded in the bent section of the box body 1.

[0039] Therefore, the present invention adopts the above-mentioned force monitoring device and monitoring method for a model test box in civil engineering. By setting a plurality of force measuring plates fixed on the box body, and by reading the readings of the normal force measuring sensors and tangential force measuring sensors on each force measuring plate, the purpose of monitoring the normal and tangential force magnitudes at any position on the side of the model box during the model test loading process is achieved.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A force monitoring device for a model test box used in civil engineering, characterized in that It includes a box body, on which a force measuring plate, a sealing strip, a right connecting device, a bottom beam and a left connecting device are provided. Horizontal and vertical sealing strips are arranged between the force measuring plates. The front plate of the force measuring plate in the force measuring plates is connected to the bottom beam support on the bottom beam. The support of the right connecting device in the right connecting device is connected to the front plate of the force measuring plate. The support of the left connecting device in the left connecting device contacts the tangential force measuring sensor and the tangential fixing bracket fixed at the groove of the front plate of the force measuring plate; the L-shaped connecting plate in the left connecting device is connected to the sealing strip; The force measuring plate includes a front plate of the force measuring plate, a normal force measuring device and a back plate of the force measuring plate. Four grooves are provided on the left side of the front plate of the force measuring plate to fix the force measuring sensor and the tangential fixing bracket respectively. The adjacent front plates of the force measuring plates are connected by screws through the tangential fixing bracket. The front plate of the force measuring plate slides along the tangential fixing bracket. Two grooves are provided on the lower side of the front plate of the force measuring plate to fix two groups of vertical fixing brackets. The back of the front plate of the force measuring plate is connected to five groups of normal force measuring devices. The normal force measuring device is connected and fixed to the back plate of the force measuring plate.

2. The force monitoring device for a model test box used in civil engineering according to claim 1, characterized in that, The normal measurement device includes an adapter, a normal force measuring sensor and a sensor bracket. The normal force measuring sensor is connected to the front plate of the force measuring plate through the adapter. The normal force measuring sensor is connected to the back plate of the force measuring plate through the sensor bracket; The back plate of the force measuring plate includes a bolt sleeve, a steel plate and steel bars. The bolt sleeve is embedded in the side of the box body. The bolt inside the bolt sleeve is welded to the steel plate. Grouting is carried out between the steel plate and the side of the box body. Horizontal and vertical steel bars are welded to the back of the steel plate.

3. The force monitoring device for a model test box used in civil engineering according to claim 1, characterized in that, The right connecting device includes a right connecting device embedded part and a right connecting device bracket connected together. The right connecting device bracket is connected and fixed to the right connecting device embedded part of the bent section embedded in the box body.

4. The force monitoring device for a model test box used in civil engineering according to claim 1, characterized in that, The bottom beam includes a bottom beam embedded part, a rail, a slideway, a limiting device and a bottom beam support. The bottom beam is composed of several sections of rails connected together. The bottom of the bottom beam is connected and fixed to the bottom beam embedded part buried in the ground of the box body by studs. A slideway is arranged at the top of the rail. The bottom beam support is arranged at the top of the slideway and moves along the slideway. Limiting devices are arranged on both sides of the bottom beam support.

5. The force monitoring device for a model test box used in civil engineering according to claim 1, characterized in that, The left connecting device includes a left connecting device embedded part, a left connecting device bracket and an L-shaped connecting plate. The left connecting device bracket is connected and fixed to the left connecting device embedded part of the bent section on the left side of the box body.

6. A monitoring method for a force monitoring device of a model test box for civil engineering as described in any one of claims 1-5, characterized in that, It includes the following steps: Step S1: Read the readings of the normal force measuring sensors and sum them up to calculate and determine the magnitude of the force; During the model test loading process, the readings of the five normal force sensors in each force measuring plate are read and summed, denoted as F n , and the magnitude of the force in the direction perpendicular to the plate surface within the area covered by the force measuring plate is F n ; Step S2: Read the readings of the tangential force measuring sensors of the force measuring plate, sum them up, and read the readings of the tangential force measuring sensors of the adjacent force measuring plate on the right side of the force measuring plate and sum them up; Read the readings of the two tangential force sensors on each force measuring plate and sum them up, denoted as F t1， Read the readings of the two tangential force sensors on the force measuring plate adjacent to the right side of the force measuring plate and sum them up, denoted as F t2 , if there is no adjacent force measuring plate on the right side, it is recorded as 0, and the force on the plane within the coverage area of the force measuring plate along the loading direction is F t1 - F t2 .

Images