CN116026281A - A concrete strain gauge installation device with protection function and its construction method - Google Patents

Abstract

The invention relates to a concrete strain gauge installation device with protection function and its construction method. The installation device includes a fixing box located between the steel bars of two structures, and the front and rear sides of the fixing box are fixed on the two structures through the first steel rod. On the reinforcing bar, the left and right sides of the fixing box are provided with second steel rods, the front and rear ends of the second steel rods are fixed on two steel bars of the structure, the first steel plates are fixed on the front and rear sides of the fixing box and the second steel rods are fixed on the left and right sides. Two steel plates, the sensor base is formed between the two first steel plates and the second steel plate, the strain sensor is installed in the sensor base, the dowel rods on the left and right sides of the strain sensor pass out of the fixed box, and Corresponding to the dowel bar, a dowel bar positioning assembly is provided, and a wire reserved hole is arranged on the fixing box, and the wire connected to the strain sensor passes through the wire reserved hole. The invention can realize the protection of the embedded strain sensor, and has the advantages of convenient installation and accurate measurement result.

Description

A concrete strain gauge installation device with protection function and its construction method

technical field

The invention relates to the technical field of strain gauge installation devices, in particular to a concrete strain gauge installation device with protection function and a construction method thereof.

Background technique

In the field of modern construction engineering testing, embedded concrete strain gauges are often used to detect the stress and strain of concrete. There are three requirements for the installation of this type of strain gauge: 1. The sensor parts of the strain gauge are relatively fragile, and the sensor is required not to be damaged during the construction process; 2. The position and direction are required to be accurate, and it is not easy to deviate from the position of the measuring point; Effect of steel deformation.

The traditional binding method uses hard steel wires to bind the stress-bearing handles at both ends of the concrete strain gauge to the steel bars near the measuring point. This method has defects. First, the strain gauge sensor and other components are exposed, which are easily damaged by concrete falling during the pouring process or The concrete is destroyed when vibrating, causing damage to the strain gauge and failure of the measuring point; second, if there is no steel bar at the measuring point, the strain gauge can only be bound to the nearest steel bar to the measuring point, which is easy to deviate from the position of the measuring point, and the steel wire binding is disturbed The direction of the strain gauge will change due to the slippage. Third, because the diameter of the rings at both ends of the strain gauge is larger than that of the shaft, the wire binding will cause the strain gauge to be deformed by bending, resulting in inaccurate readings. , the strain gauge is bound to the threaded steel bar, which will easily cause the stressed ring to be stuck by the threaded reinforcement of the steel bar, and the expansion and contraction deformation of the steel bar will affect the reading of the strain gauge, so that the real deformation of the concrete material cannot be obtained in the follow-up test.

Contents of the invention

The invention aims to solve the deficiencies of the prior art, and provides a concrete strain gauge installation device with protection function and a construction method thereof.

In order to achieve the above object, the present invention adopts the following technical solutions:

A concrete strain gauge installation device with protection function, comprising a fixing box located between two structural reinforcements, the front and rear sides of the fixing box are fixed on the two structural reinforcements through a first steel rod, and the left and right sides of the fixing box are provided with There is a second steel rod, the front and rear ends of the second steel rod are fixed on two steel bars of the structure, the first steel plates are fixed on the front and rear sides and the second steel plates are fixed on the left and right sides in the fixed box, the two first steel plates, The sensor base is formed between the second steel plates, the strain sensor is installed in the sensor base, the dowel rods on the left and right sides of the strain sensor pass out of the fixed box, and the corresponding dowel rods are provided with dowel rods on the second steel rod The positioning component is provided with a wire reserved hole on the fixed box, and the wire connected to the strain sensor passes through the wire reserved hole.

The fixed box includes a box body connected with two first steel rods and a box cover hinged on the top of the box body.

Reserved holes for dowel rods are arranged on the left and right sides of the box body, and the dowel rods pass through the reserved holes for the dowel rods.

The dowel bar positioning assembly includes a pad welded on the second steel rod, a U-shaped spring clip is welded on the top of the pad, and the dowel bar is inserted in the U-shaped spring clip.

An arc-shaped groove is arranged on the second steel plate, and the dowel rod is installed in the arc-shaped groove.

A metal disc is arranged at the end of the dowel bar, and the diameter of the metal disc is larger than that of the dowel bar.

The construction method of the above-mentioned concrete strain gauge installation device with protective function is characterized in that the specific steps are:

S1. First determine the model of the embedded strain sensor, determine the length, width and height of the strain sensor, the diameter of the dowel, and the diameter of the metal disc;

S2. Determine the position of the point to be measured by the strain sensor, and determine the distance between the steel bars of the structure near the point;

S3, making a fixed box

The fixed box is divided into a box body and a box cover. The box body is made of a steel plate without a cover. The length of the box body is 3cm larger than the length of the strain sensor, the width is 3cm larger than the width of the strain sensor, and the height is 1cm larger than the height of the strain sensor. ; There are reserved holes for dowel rods and wires on the left and right sides of the box body. The reserved holes for dowel rods are semicircular. The diameter of the hole is larger than the diameter of the wire, and the box body and the box cover are hingedly connected. After the box cover is closed, it can ensure that the strain sensor will not be damaged by falling rocks during pouring concrete, which plays a protective role;

S4. Make the sensor base

welding two first steel plates and two second steel plates on the bottom plate of the fixed box as the base for fixing the strain sensor;

The first steel plate is welded close to the strain sensor, the distance between the two first steel plates is the width of the strain sensor, the length of the first steel plate is 1-2cm smaller than the length of the strain sensor, and the height of the first steel plate is the height of the strain sensor;

The distance between the two second steel plates is 4mm larger than the length of the strain sensor, the length of the second steel plate is 2cm smaller than the width of the strain sensor, the height of the second steel plate is the height of the strain sensor, the second steel plate is provided with an arc groove, and the arc The radius of the groove is 2cm larger than the diameter of the dowel;

S5. Install the fixed box

The fixed box is welded and fixed to the first steel rod, and the end of the first steel rod is welded and fixed to the steel bar of the structure. The elevation, plane position, and left-right distance of the fixed box from the steel bar of the structure are all determined by the position of the measuring point;

S6, making U-shaped spring clips

The dowel bar is fixed by a U-shaped spring clip. The U-shaped spring clip is made of an elastic steel sheet to form a circle with a top opening. The top opening is made into a trumpet shape to facilitate the insertion of the dowel bar. The diameter of the circle is larger than that of the dowel bar. 2cm and less than the diameter of the metal disc, to ensure that the dowel rod can be freely expanded and contracted in the U-shaped spring clip, but it will not fall off;

S7, fixed U-shaped spring clip

The U-shaped spring clip and the second steel rod are connected and fixed by pads, and the two ends of the second steel rod are welded and fixed with the steel bars of the structure. The elevation of the U-shaped spring clip is adjusted by the height of the pad to ensure that the dowel rod is in the The center of the U-shaped spring clip is not in direct contact with the U-shaped spring clip. The left and right distance between the U-shaped spring clip and the steel bar of the structure is determined by the position of the measuring point. The distance between the first steel rod and the second steel rod is determined by the force transmission. The length of the rod is determined to ensure that the U-shaped spring clip is located between the strain sensor and the metal disc;

S8. Install the strain sensor

Install the embedded strain sensor in the base of the fixed box, pass the dowel rod through the reserved hole of the dowel rod, and insert the dowel rod into the U-shaped spring clip at the same time, check that the installation is firm, and then fix the The lid of the box is closed;

S9, install wire

Extend the wire from the wire reserved hole on the side of the fixing box, bind the extended wire along the first steel pole and the steel bar of the structure, lead the wire to the side of the bridge or the bridge deck guardrail, and protect the wire plug;

S10. Check the installation effect

Connect the wire plug leading to the side of the bridge or the guardrail of the bridge deck to the detection instrument, check whether the reading of the strain sensor is abnormal, and ensure that the installation is correct, and the installation is complete.

In step S3, the box cover is made of a stainless steel plate with a thickness of 10mm.

In step S4, the thickness of the first steel plate and the second steel plate is 10 mm.

The beneficial effects of the invention are: the invention can realize the protection of the embedded strain sensor, and the installation is convenient and the measurement result is accurate.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a schematic diagram of the reserved holes for the force rod on the side of the box body and the reserved holes for the wires;

Fig. 3 is the schematic diagram of the arc groove on the second steel plate;

Fig. 4 is the sectional view of A-A in Fig. 1;

Fig. 5 is the sectional view of B-B in Fig. 1;

In the figure: 1-Fixing box; 2-First steel rod; 3-Second steel rod; 4-First steel plate; 5-Second steel plate; 6-Dowel bar positioning assembly; - structural reinforcement; 9 - strain sensor; 10 - dowel; 11 - wire; 12 - arc groove; 13 - metal disc;

101-box body; 102-box cover; 103-reserved hole for dowel bar;

601-pad; 602-U-shaped spring clip;

The following will be described in detail in conjunction with the embodiments of the present invention with reference to the accompanying drawings.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention. In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or there can also be an intervening component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Fig. 1 to Fig. 5, a kind of concrete strain gage installation device with protective function, comprises the fixing box 1 between two structure steel bars 8, and the front and rear sides of the fixing box 1 are fixed on the On the two structural object reinforcing bars 8, the left and right sides of the fixing box 1 are provided with a second steel rod 3, and the front and rear ends of the second steel rod 3 are fixed on the two structural object reinforcing bars 8, and the front and rear sides of the fixing box 1 are fixed with The first steel plate 4 and the second steel plate 5 are fixed on the left and right sides, a sensor base is formed between the two first steel plates 4 and the second steel plate 5, and the strain sensor 9 is installed in the sensor base. The dowel bar 10 on the side passes out of the fixed box 1, the second steel bar 3 is provided with a dowel bar positioning assembly 6 corresponding to the dowel bar 10, the fixed box 1 is provided with a wire reserved hole 7, and the strain sensor 9 is connected The wire 11 passes through the wire reserved hole 7 .

The fixed box 1 includes a box body 101 connected with two first steel rods 2 and a box cover 102 hinged on the top of the box body 101 .

Dowel rod reserved holes 103 are provided on the left and right sides of the box body 101 , and the dowel rod 10 passes through the dowel rod reserved holes 103 .

The dowel bar positioning assembly 6 includes a pad 601 welded on the second steel rod 3 , a U-shaped spring clip 602 is welded on the top of the pad 601 , and the dowel 10 is inserted into the U-shaped spring clip 602 .

The second steel plate 5 is provided with an arc-shaped groove 12 , and the dowel 10 is installed in the arc-shaped groove 12 .

A metal disc 13 is provided at the end of the dowel bar 10 , and the diameter of the metal disc 13 is larger than that of the dowel bar 10 .

The construction method of the above-mentioned concrete strain gauge installation device with protective function is characterized in that the specific steps are:

S1, first determine the model of the embedded strain sensor 9, determine the length, width and height of the strain sensor 9, the diameter of the dowel 10, and the diameter of the metal disc;

S2, determine the position of the point to be measured by the strain sensor 9, and determine the distance between the steel bars 8 of the structure near the point;

S3, making a fixed box 1

Fixed box 1 is divided into box body 101, box cover 102, and box body 101 utilizes steel plate to make no lid box shape, and the length of box body 101 is larger than the length of strain sensor 9 by 3cm, and the width is larger than the width of strain sensor 9 by 3cm, height 1cm larger than the height of the strain sensor 9; the left and right sides of the box body 101 are provided with reserved holes 103 for dowel bars and reserved holes 7 for wires, the reserved holes 103 for dowel bars are semicircular, and the reserved holes 103 for dowel bars are The radius is 2cm larger than the diameter of the dowel bar 10, the diameter of the wire reserved hole 7 is greater than the diameter of the wire 11, the box body 101 is hingedly connected with the lid 102, and the strain sensor 9 can be guaranteed not to be poured when the concrete is covered after the lid 102 is covered. Rockfall damage, play a protective role;

S4. Make the sensor base

Weld two first steel plates 4 and two second steel plates 5 on the bottom plate of the box body 101 of the fixed box 1 as the base for fixing the strain sensor 9;

The first steel plate 4 is welded close to the strain sensor 9, the distance between the two first steel plates 4 is the width of the strain sensor 9, the length of the first steel plate 4 is 1-2cm smaller than the length of the strain sensor 9, the height of the first steel plate 4 is the height of the strain sensor 9;

The distance between two second steel plates 5 is greater than the length of the strain sensor 9 by 4mm, the length of the second steel plate 5 is 2cm smaller than the width of the strain sensor 9, the height of the second steel plate 5 is the height of the strain sensor 9, the second steel plate 5 An arc-shaped groove 12 is provided, and the radius of the arc-shaped groove 12 is 2 cm larger than the diameter of the dowel 10;

S5. Install the fixed box 1

The fixed box 1 is welded and fixed with the first steel rod 2, and the end of the first steel rod 2 is welded and fixed with the steel bar 8 of the structure. The elevation, plane position, and left-right distance of the fixed box 1 from the steel bar 8 of the structure are all determined by the position of the measuring point;

S6, making U-shaped spring clip 602

Dowel 10 is fixed by U-shaped spring clip 602, U-shaped spring clip 602 adopts elastic steel sheet to make a circle with top opening, and the top opening is made into a trumpet shape, which is convenient for insertion of dowel 10, and the diameter of circle is larger than force transmission The diameter of the rod 10 is 2cm larger and smaller than the diameter of the metal disc 13, ensuring that the dowel 10 can be freely expanded and contracted in the U-shaped spring clip 602, but does not fall off;

S7, fixed U-shaped spring clip 602

The U-shaped spring clip 602 and the second steel rod 3 are connected and fixed by a pad 601, and the two ends of the second steel rod 3 are welded and fixed with the structure steel bar 8, and the elevation of the U-shaped spring clip 602 is adjusted by the height of the pad 601 , to ensure that the dowel 10 is in the center of the U-shaped spring clip 602 and not in direct contact with the U-shaped spring clip 602. The left and right spacing between the U-shaped spring clip 602 and the steel bar 8 of the structure is determined by the position of the measuring point. The first The distance between the steel rod 2 and the second steel rod 3 is determined by the length of the dowel 10, ensuring that the U-shaped spring clip 602 is located between the strain sensor 9 and the metal disc 13;

S8, install the strain sensor 9

Install the embedded strain sensor 9 in the base of the fixed box 1, pass the dowel bar 10 through the dowel bar reserved hole 103, and insert the dowel bar 10 into the U-shaped spring clip 602 at the same time, check After the installation is firm, cover the box cover 102 of the fixed box 1;

S9, installation wire 11

Extend the wire 11 from the wire reserved hole 7 on the side of the fixed box 1, bind the extended wire 11 along the first steel pole 2 and the steel bar 8 of the structure, and lead the wire 11 to the side of the bridge or the bridge deck guardrail , and protect the wire 11 plug;

S10. Check the installation effect

Connect the wire 11 plug leading to the side of the bridge or the bridge deck guardrail to the testing instrument, check whether the readings of the strain sensor 9 are abnormal, and ensure that the installation is complete after the installation is correct.

In step S3, the box cover 102 is made of a stainless steel plate with a thickness of 10 mm.

In step S4, the thickness of the first steel plate 4 and the second steel plate 5 is 10mm.

The invention can realize the protection of the embedded strain sensor 9, and has the advantages of convenient installation and accurate measurement results.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods, as long as the various improvements of the method concept and technical solutions of the present invention are adopted, or directly applied to other Occasions, all within the protection scope of the present invention.

Claims (9)

1. A concrete strain gauge installation device with protection function, characterized in that it includes a fixing box (1) located between two structural steel bars (8), and the front and rear sides of the fixing box (1) pass through the first steel rod (2) It is fixed on two structural steel bars (8), and the left and right sides of the fixed box (1) are provided with a second steel rod (3), and the front and rear ends of the second steel rod (3) are fixed on the two structural objects On the steel bar (8), the first steel plate (4) is fixed on the front and rear sides in the fixed box (1) and the second steel plate (5) is fixed on the left and right sides, two first steel plates (4), the second steel plate (5) ) to form a sensor base, the strain sensor (9) is installed in the sensor base, the dowel rods (10) on the left and right sides of the strain sensor (9) pass through the fixed box (1), and the second steel rod (3) There is a dowel positioning assembly (6) corresponding to the dowel bar (10) on the top, and a wire reserved hole (7) is provided on the fixed box (1), and the wire (11) connected to the strain sensor (9) is connected to the Wire reserved hole (7) passes through. 2. A concrete strain gauge installation device with protective function according to claim 1, characterized in that the fixing box (1) includes a box body (101) connected with two first steel rods (2) and a hinge The lid (102) on the top of the box body (101). 3. A concrete strain gauge installation device with protection function according to claim 2, characterized in that the left and right sides of the box body (101) are provided with dowel rod reserved holes (103), and the dowel rod ( 10) Pass through the reserved hole (103) of the dowel bar. 4. A concrete strain gauge installation device with protection function according to claim 3, characterized in that, the dowel bar positioning assembly (6) includes a pad (601) welded on the second steel bar (3) , a U-shaped spring clip (602) is welded on the top of the spacer (601), and the dowel (10) is inserted in the U-shaped spring clip (602). 5. A concrete strain gauge installation device with protection function according to claim 4, characterized in that, the second steel plate (5) is provided with an arc-shaped groove (12), and the dowel bar (10) is installed on the arc shaped groove (12). 6. A concrete strain gauge installation device with protection function according to claim 5, characterized in that a metal disc (13) is provided at the end of the dowel bar (10), and the diameter of the metal disc (13) is greater than the diameter of the dowel rod (10). 7. A construction method of the concrete strain gauge installation device with protective function according to claim 6, characterized in that, the specific steps are: S1. First determine the model of the embedded strain sensor (9), determine the length, width and height of the strain sensor (9), the diameter of the dowel bar (10), and the diameter of the metal disc; S2. Determine the position of the strain sensor (9) to be measured, and determine the distance between the steel bars (8) of the structure near the measurement point; S3. Making a fixed box (1) The fixed box (1) is divided into a box body (101) and a box cover (102). The box body (101) is made of a steel plate without a cover. The length of the box body (101) is 3cm longer than that of the strain sensor (9) , the width is 3cm larger than the width of the strain sensor (9), and the height is 1cm larger than the height of the strain sensor (9); the left and right sides of the box body (101) are provided with dowel rod reserved holes (103) and wire reserved holes (7), the reserved hole for the dowel rod (103) is a semicircle, the radius of the reserved hole for the dowel rod (103) is 2cm larger than the diameter of the dowel rod (10), and the diameter of the reserved hole for the wire (7) is larger than the wire (11), the box body (101) is hingedly connected with the box cover (102), and the cover (102) can ensure that the strain sensor (9) will not be damaged by falling rocks when pouring concrete, and play a protective role; S4. Make the sensor base Weld two first steel plates (4) and two second steel plates (5) on the bottom plate of the box body (101) of the fixed box (1) as the base for fixing the strain sensor (9); The first steel plate (4) is welded close to the strain sensor (9), the distance between the two first steel plates (4) is the width of the strain sensor (9), and the length of the first steel plate (4) is greater than the strain sensor (9) Length is small l-2cm, the height of the first steel plate (4) is the height of strain sensor (9); The distance between the two second steel plates (5) is 4mm larger than the length of the strain sensor (9), the length of the second steel plate (5) is 2cm shorter than the width of the strain sensor (9), and the height of the second steel plate (5) is The height of the strain sensor (9), the second steel plate (5) is provided with an arc groove (12), and the radius of the arc groove (12) is 2cm larger than the diameter of the dowel bar (10); S5. Install the fixed box (1) The fixing box (1) is welded and fixed with the first steel rod (2), and the end of the first steel rod (2) is welded and fixed with the steel bar of the structure (8). 8) The left and right spacing is determined by the position of the measuring point; S6, making U-shaped spring clips (602) The dowel bar (10) is fixed by a U-shaped spring clip (602), and the U-shaped spring clip (602) is made of an elastic steel sheet to form a circle with a top opening, and the top opening is made into a trumpet shape, which is convenient for responding to the dowel bar (10 ) inserted, the diameter of the circle is 2cm larger than the diameter of the dowel rod (10) and smaller than the diameter of the metal disc (13), to ensure that the dowel rod (10) can freely expand and contract in the U-shaped spring clip (602), but not fall off; S7, fixed U-shaped spring clip (602) The U-shaped spring clip (602) is connected and fixed with the second steel rod (3) through the spacer (601), and the two ends of the second steel rod (3) are welded and fixed with the steel bar (8) of the structure, and the U-shaped spring clip The height of the piece (602) is adjusted by the height of the spacer (601) to ensure that the dowel rod (10) is in the center of the U-shaped spring clip (602) and does not directly contact the U-shaped spring clip (602). The left and right distance between the spring clip (602) and the steel bar (8) of the structure is determined by the position of the measuring point, and the distance between the first steel rod (2) and the second steel rod (3) is determined by the length of the dowel rod (10), ensuring The U-shaped spring clip (602) is located between the strain sensor (9) and the metal disc (13); S8, install the strain sensor (9) Install the embedded strain sensor (9) in the base of the fixed box (1), pass the dowel rod (10) through the dowel rod reserved hole (103), and insert the dowel rod (10) into Put it into the U-shaped spring clip (602), and after checking that the installation is firm, cover the box cover (102) of the fixed box (1); S9, installation wire (11) Extend the wire (11) from the wire reserved hole (7) on the side of the fixing box (1), bind the extended wire (11) along the first steel rod (2) and the steel bar of the structure (8), and Lead the wire (11) to the bridge side or bridge deck guardrail, and protect the wire (11) plug; S10. Check the installation effect Connect the plug of the wire (11) leading to the side of the bridge or the guardrail of the bridge deck to the detection instrument, check whether the reading of the strain sensor (9) is abnormal, and ensure that the installation is correct, and the installation is complete. 8 . The construction method of a protective concrete strain gauge installation device according to claim 7 , characterized in that, in step S3 , the box cover ( 102 ) is made of a stainless steel plate with a thickness of 10 mm. 9. The construction method of a protective concrete strain gauge installation device according to claim 8, characterized in that, in step S4, the thickness of the first steel plate (4) and the second steel plate (5) is 10 mm.

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