Model test box stress monitoring device and monitoring method for civil engineering

Abstract

The invention discloses a civil engineering model test box stress monitoring device and monitoring method.The civil engineering model test box stress monitoring device comprises a box body, force measuring plates, sealing strips, a right side connecting device, a bottom beam and a left side connecting device are arranged on the box body, and horizontal and vertical sealing strips are arranged between the force measuring plates on the two adjacent sides; a front plate of the force measuring plate is connected with a bottom beam support on the bottom beam, a right connecting device support in the right connecting device is connected with the front plate of the force measuring plate, and a left connecting device support in the left connecting device is in contact with a tangential force measuring sensor and a tangential fixing support which are fixed at a groove of the front plate of the force measuring plate; and the L-shaped connecting plate in the left side connecting device is connected with the sealing strip. According to the stress monitoring device and the stress monitoring method for the model test box for civil engineering, disclosed by the invention, by reading the readings of the normal force measurement sensor and the tangential force measurement sensor on each force measurement plate, the purpose of monitoring the normal and tangential stress at any position on the side surface of the model box in a model test loading process is realized.

Description

Technical Field

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

[0002] In the fields of geotechnical engineering and structural engineering, physical model testing is an effective method to study the interaction mechanism between landslides, prevention and control projects, and 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, with its length parallel to the main sliding direction and its width perpendicular to the main sliding direction. The area in the main sliding direction is selected at a certain interface behind the prevention and control structures such as anti-slide piles, and the interface is regarded as a stress or displacement boundary. Based on the relevant information and similarity criteria of the landslide prototype, the test model is established and the size and distribution of stress or displacement on the boundary are determined. In the test, the push plate loading method is used to replace the omitted sliding body behind the interface, so as to obtain the stress and deformation characteristics of the prevention and control structures and railway engineering structures under the thrust of the landslide, providing a reference for structural design.

[0003] In existing studies, the side of the landslide model test box (i.e., the boundary in the width direction) is usually coated with epoxy resin to reduce friction, but the specific stress boundary conditions are unknown. This is not convenient for making corresponding corrections to the model in subsequent test data analysis, nor is it convenient to monitor the stress conditions of the test box to ensure the safety of the test. Summary of the invention

[0004] The object of the present invention is to provide a force monitoring device and a monitoring method for a model test box for civil engineering. By arranging a plurality of force plates fixed on the box body and reading the indications of the normal force sensor and the tangential force sensor on each force plate, the purpose of monitoring the normal and tangential force at any position on the side of the model box during the model test loading process is achieved.

[0005] The invention provides a force monitoring device and a monitoring method for a model test box for civil engineering, comprising a box body, on which a force plate, a sealing strip, a right connecting device, a bottom beam and a left connecting device are arranged, horizontal and vertical sealing strips are arranged between the force plates, a front plate of the force plate in the force plate is connected to a bottom beam bracket on the bottom beam, a right connecting device bracket in the right connecting device is connected to the front plate of the force plate, a left connecting device bracket in the left connecting device contacts a tangential force sensor and a tangential fixing bracket fixed at a groove of the front plate of the force plate; an L-shaped connecting plate in the left connecting 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; 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 ; 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; Read the readings of the two tangential force sensors of each force plate and sum them up, recorded as F t1，Read the readings of the two tangential force sensors in the adjacent force plate on the right side of the force plate and sum them up, which is recorded as F t2 , there is no adjacent force plate on the right side, which is recorded as 0. The force magnitude of the plane in the area covered by the force plate along the loading direction is F t1 - F t2 .

[0012] Therefore, the present invention adopts the above-mentioned force monitoring device and monitoring method for a model test box for civil engineering, and achieves the purpose of monitoring the normal and tangential force at any position on the side of the model box during the model test loading process by setting up multiple force plates fixed on the box body and reading the readings of the normal force sensor and the tangential force sensor on each force plate.

[0013] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a force monitoring device and a monitoring method for a model test box for civil engineering of the present invention; Figure 2 It is a structural schematic diagram of a force monitoring device and monitoring method for a model test box for civil engineering of the present invention, after removing part of the front plate and the sealing strip of the force plate; Figure 3 A model test box force monitoring device and monitoring method for civil engineering according to the present invention Figure 2 An enlarged view of the embodiment A of the present invention; Figure 4 It is a structural schematic diagram of a force monitoring device and monitoring method for a model test box for civil engineering of the present invention after a part of the front plate and the sealing strip are removed near the bottom beam; Figure 5 A model test box force monitoring device and monitoring method for civil engineering according to the present invention Figure 4 An enlarged view of the embodiment B of the present invention; Figure 6 It is a top view of a force monitoring device and monitoring method for a model test box for civil engineering of the present invention, close to the right side of the box body; Figure 7 It is a structural schematic diagram of the back side of the right side box body of a force monitoring device and monitoring method for a model test box for civil engineering of the present invention; Figure 8 The present invention is a top view of a force monitoring device and a monitoring method for a model test box for civil engineering, close to the left side of the box body.

[0015] Reference numerals 1. Box body; 2. Force plate; 201. Front plate of force plate; 2011. Tangential force sensor; 2012. Tangential fixing bracket; 2013. Vertical fixing bracket; 202. Normal force measuring device; 2021. Adapter; 2022. Normal force sensor; 2023. Sensor bracket; 203. Back plate of force plate; 2031. Bolt sleeve; 2032. Steel plate; 2033. Steel bar; 3. Sealing strip; 4. Right side connecting device; 401. Embedded parts of right side connecting device; 402. Bracket of right side connecting device; 5. Bottom beam; 501. Embedded parts of bottom beam; 502. Rail; 503. Slideway; 504. Limiting device; 505. Bracket of bottom beam; 6. Left side connecting device; 601. Embedded parts of left side connecting device; 602. Bracket of left side connecting device; 603. L-shaped connecting plate. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0017] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0018] The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprises" and similar terms mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0019] Embodiment 1 like Figure 1-Figure 8 As shown, the present invention provides a force monitoring device and monitoring method for a model test box for civil engineering, including a box body, wherein a force plate 2, a sealing strip 3, a right connecting device 4, a bottom beam 5 and a left connecting device 6 are provided on the box body 1, and horizontal and vertical sealing strips 3 are provided between the force plates 2 on adjacent sides to prevent the test material from entering the gap between the force plates.

[0020] The force plate 2 includes a force plate front plate 201, a normal force measuring device 202 and a force plate back plate 203. The left side of the force plate front plate 201 is provided with four grooves for fixing the tangential force sensor 2011 and the tangential fixing bracket 2012 respectively. The tangential force sensor 2011 is used to measure the magnitude of the interaction force between adjacent force plates. The tangential fixing bracket 2012 connects the adjacent force plate front plates 201 by screws to provide guidance and leveling. The force plate front plate 201 slides along the tangential fixing bracket 2012 to avoid interference with the measurement of the tangential force sensor 2011. The lower side of the force plate front plate 201 is provided with two grooves for fixing two groups of vertical fixing brackets 2013; the lower force plate front plate 201 provides support for the upper force plate front plate 201 through the vertical fixing bracket 2013 and performs leveling.

[0021] The back of the force plate front plate 201 is connected to five groups of normal force measuring devices 202 to measure the force magnitude in the direction perpendicular to the plate surface of the force plate front plate 201. The normal force measuring devices 202 are connected and fixed to the force plate back plate 203.

[0022] The normal measurement device 202 includes an adapter 2021, a normal force sensor 2022 and a sensor bracket 2023. The normal force sensor 2022 is connected to the front plate 201 of the force plate through the adapter 2021. The adapter 2021 can accommodate a certain range of rotation and sliding deformation to avoid interference with the measurement of the normal force sensor 2022. The normal force sensor 2022 is connected to the back plate 203 of the force plate through the sensor bracket 2023; the sensor bracket 2023 has a leveling function and provides support for the normal force sensor 2022. The back plate 203 of the force plate includes a bolt sleeve 2031, a steel plate 2032 and a steel bar 2033. The bolt sleeve 2031 is pre-embedded in the side of the box body 1, and the bolts inside the bolt sleeve 2031 are welded to the steel plate 2032 to provide fixation and leveling. Grouting is performed between the steel plate 2032 and the side of the box body 1, and transverse and vertical steel bars 2033 are welded to the back of the steel plate 2032. This allows the force plate back plate 203 to be in closer contact with the grouting material.

[0023] The force plate front plate 201 in the force plate 2 is connected to the bottom beam bracket 505 on the bottom beam 5, the right connecting device bracket 402 in the right connecting device 4 is connected to the force plate front plate 201, and the left connecting device bracket 602 in the left connecting device 6 contacts the tangential force sensor 2011 and the tangential fixing bracket 2012 fixed at the groove of the force plate front plate 201; the L-shaped connecting plate 603 in the left connecting device 6 is connected to the sealing strip 3.

[0024] The right connecting device 4 includes a right connecting device embedded part 401 and a right connecting device bracket 402 . The right connecting device bracket 402 is connected and fixed to the right connecting device embedded part 401 embedded in the bending section of the box body 1 .

[0025] The bottom beam 5 includes a bottom beam embedded part 501, a steel rail 502, a slide 503, a limit 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 fixed to the bottom beam embedded part 501 embedded in the ground of the box body 1 by studs. The slide 503 is set on the top of the steel rail 502. The bottom beam 5 bracket is set at the top of the slide 503 and moves along the slide 503. Limit devices 504 are provided on both sides of the bottom beam bracket 505.

[0026] The left connecting device 6 comprises 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 connected and fixed to the left connecting device embedded part 601 of the bending section embedded in the box body 1 .

[0027] Therefore, the present invention adopts the above-mentioned force monitoring device and monitoring method for a model test box for civil engineering, and achieves the purpose of monitoring the normal and tangential force at any position on the side of the model box during the model test loading process by setting up multiple force plates fixed on the box body and reading the readings of the normal force sensor and the tangential force sensor on each force plate.

[0028] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A force monitoring device for a model test box for civil engineering, characterized in that: It includes a box body, on which a force plate, a sealing strip, a right connecting device, a bottom beam and a left connecting device are arranged. Horizontal and vertical sealing strips are arranged between the force plates. The front plate of the force plate in the force 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 plate. The left connecting device bracket in the left connecting device contacts the tangential force sensor and the tangential fixing bracket fixed at the groove of the front plate of the force plate. The L-shaped connecting plate in the left connecting device is connected to the sealing strip.

2. A force monitoring device for a model test box for civil engineering according to claim 1, characterized in that: The force plate includes a front plate, a normal force measuring device and a back plate of the force plate. Four grooves are provided on the left side of the front plate of the force plate to respectively fix the force sensor and the tangential fixing bracket. The tangential fixing bracket connects the adjacent front plates of the force plate through screws. The front plate of the force plate slides along the tangential fixing bracket. Two grooves are provided on the lower side of the front plate of the force plate to fix two groups of vertical fixing brackets. The back side of the front plate of the force 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.

3. A force monitoring device for a model test box for civil engineering according to claim 2, characterized in that: The normal measuring 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.

4. The force monitoring device for a model test box for civil engineering according to claim 1, characterized in that: 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 embedded in the bending section of the box body.

5. The force monitoring device for a model test box for civil engineering according to claim 1, characterized in that: The bottom beam includes bottom beam embedded parts, rails, slides, limit devices and bottom beam brackets. The bottom beam is composed of several sections of rails. The bottom of the bottom beam is fixed to the bottom beam embedded parts embedded in the box floor by studs. A slide is set on the top of the rails. The bottom beam bracket is set on the top of the slide and moves along the slide. Limit devices are provided on both sides of the bottom beam bracket.

6. The force monitoring device for a model test box for civil engineering according to claim 1, characterized in that: The left connecting device comprises 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 bending section embedded in the box body.

7. A monitoring method for a force monitoring device for a model test box for civil engineering as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1, read the normal force sensor readings and calculate the sum to determine the force magnitude; 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 ; 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; Read the readings of the two tangential force sensors of each force plate and sum them up, recorded as F t1， Read the readings of the two tangential force sensors in the adjacent force plate on the right side of the force plate and sum them up, which is recorded as F t2 , there is no adjacent force plate on the right side, which is recorded as 0. The force magnitude of the plane in the area covered by the force plate along the loading direction is F t1 - F t2 .

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