CN111962574A - Anchor head displacement measuring device, system and method - Google Patents

Abstract

The invention discloses an anchor head displacement measuring device, system and method. The anchor head displacement measuring device comprises a rope measuring device, a rope body, an angle measuring device and a supporting device; the rope measuring device is used for retracting the rope body, lock the length of the rope body and read the length, the rope measuring device is fixed at one end of the anchor rod and connected with one end of the rope body; the angle measuring device is used to measure the pull-out of the anchor rod The angle of the rope body changes during the extraction process, and the angle measuring device is connected to the other end of the rope body and fixedly connected to the support device; the support device is used to be fixed at a preset soil body. The beneficial effects of the invention are that the installation is simple, the requirements for the site are not high, and the displacement of the anchor head is accurately measured.

Description

Anchor head displacement measuring device, system and method

technical field

The invention relates to the technical field of quality detection of engineering bolts, and more particularly, to a device, system and method for measuring the displacement of an anchor head.

Background technique

In the quality inspection of engineering bolts, the detection of the displacement and pull-out of the anchor head usually adopts the method of setting up a dial indicator to measure the displacement of the anchor head. An inclined plane is difficult to erect and takes a long time, which affects work efficiency. When the rack meter is not standardized, there is still a large reading error. In other scenarios, there are also problems such as large reading errors due to the slip of the dial indicator head, the torsion of the magnetic base, and the shaking of the reference beam.

SUMMARY OF THE INVENTION

The invention provides an anchor head displacement measuring device, system and method, which solves the problems of high erection difficulty, long time, influence on work efficiency and large reading error.

In order to solve the above problems, in the first aspect, the present invention provides an anchor head displacement measuring device, including a rope measuring device, a rope body, an angle measuring device and a supporting device;

The rope measuring device is used for retracting the rope body, locking the length of the rope body and reading the length, and the rope measuring device is fixed at one end of the anchor rod and connected with one end of the rope body;

The angle measuring device is used to measure the angle change of the rope body during the pull-out process of the anchor rod, and the angle measuring device is connected with the other end of the rope body and fixedly connected to the support device;

The supporting device is used to be fixed at a preset soil body.

In the anchor head displacement measuring device of the present invention, the rope measuring device and the anchor rod are fixedly connected through a hoop.

In the anchor head displacement measuring device of the present invention, the angle measuring device includes an angle sensor and a box body;

The angle sensor is arranged in the box and can move in the box to measure the angle change of the rope body during the pull-out process of the anchor rod. The angle sensor is connected with the other end of the rope body, so The box body is fixedly connected to the support device.

In the anchor head displacement measuring device of the present invention, the supporting device includes a fixing rod and a bracket;

The top of the fixing rod is fixedly connected to the box body, and the bottom of the fixing rod is inserted and fixed at a preset soil body; the bracket is fixed to the fixing rod to support the fixing rod and keep it Stablize.

In the anchor head displacement measuring device of the present invention, the rope body is a flexible measuring rope with scale marks made of steel strands.

In a second aspect, an anchor head displacement measurement system is provided, comprising the above-mentioned anchor head displacement measurement device, an anchor rod, an anchor, a jack and a bearing plate;

The other end of the anchor rod is inserted into the preset anchoring soil body, the anchor tool and the jack are respectively sleeved on the anchor rod, and the bearing plate is set at the place where the jack and the anchoring soil body are located. between the provided support surfaces.

In a third aspect, a method for measuring the displacement of the anchor head is provided, which is realized by the above-mentioned device for measuring the displacement of the anchor head, including:

Read the initial reading L1 of the rope body;

Apply a test force to the rope body, and after the test force is applied, read the current reading L2 of the rope body and the deflection angle ∠α of the rope body shown by the angle sensor;

Using the triangular cosine theorem cosα=(L1 ² +L2 ² -L3 ² )/(2*L1*L2), the anchor head displacement L3 is calculated.

In the method for measuring the displacement of the anchor head according to the present invention, in the initial reading L1 of the readout rope body:

The initial reading L1 is the sum of the length of the rope body initially pulled out and the length from the connection between the angle sensor and the rope body to the spherical center of the angle sensor.

In the method for measuring the displacement of the anchor head according to the present invention, in the initial reading L2 of the read-out rope body:

The initial reading L2 is the sum of the length of the rope body currently pulled out and the length from the connection between the angle sensor and the rope body to the spherical center of the angle sensor.

In the anchor head displacement measurement method of the present invention, it also includes:

The rope body and the angle sensor are kept on the same line so that the deflection direction of the angle sensor is consistent with the pull-out direction of the anchor rod.

The beneficial effects of the present invention are:

The installation is simple, the requirements for the site are not high, and the displacement of the anchor head is accurately measured.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of a kind of anchor head displacement measuring device and system provided by the present invention;

2 is an initial schematic diagram of an experiment of an anchor head displacement measuring device provided by the present invention;

FIG. 3 is a schematic diagram of the end of the experiment of an anchor head displacement measuring device provided by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation shown in the drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, the word "exemplary" is used to mean "serving as an example, illustration or illustration". Any embodiment of this disclosure described as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the present invention. In the following description, details are set forth for the purpose of explanation. It will be understood that one of ordinary skill in the art will realize that the present invention may be practiced without the use of these specific details. In other instances, well-known structures and procedures have not been described in detail so as not to obscure the description of the present invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of an anchor head displacement measuring device and system provided by the present invention. The anchor head displacement measuring device includes a rope measuring device 7 , a rope body 8 , an angle measuring device 20 and a supporting device 30 . The rope measuring device 7 is used for retracting the rope body 8, locking the length of the rope body 8 and reading the length. The rope measuring device 7 is fixed at one end of the anchor rod 6 and is connected with the rope. One end of the body 8 is connected.

In this embodiment, the measuring rope device 7 is fixed on the head of the anchor rod 6 and is connected with the tail end of the measuring rope (rope body 8). It has the functions of retracting and releasing the measuring rope, locking the length of the measuring rope, automatically reading the length of the measuring rope, and storing the measuring rope.

The angle measuring device 20 is used to measure the angle change of the rope body 8 during the pull-out process of the anchor rod 6 . The angle measuring device 20 is connected to the other end of the rope body 8 and is fixedly connected to the support device. 30; the angle measuring device 20 includes an angle sensor 9 and a box body 10; the angle sensor 9 is arranged in the box body 10 and can move in the box body 10 to measure the anchor rod 6 during the extraction process The angle of the rope body 8 changes, the angle sensor 9 is connected to the other end of the rope body 8 , and the box body 10 is fixedly connected to the support device 30 .

In this embodiment, the angle sensor 9 is connected to the head end of the rope body 8, and can measure the change of the angle of the rope body during the pulling out process of the anchor rod 6. The box body 10 fixes and accommodates the angle sensor 9 , and the bottom can be connected with the fixing rod 11 . Specifically, the box body 10 should be able to stably wrap the angle sensor 9 , and has a bolt hole at the bottom thereof, so that it can be stably connected to the fixing rod 11 .

The supporting device 30 is used to be fixed at a predetermined soil body 13 . The support device 30 includes a fixed rod 11 and a bracket 12; the top of the fixed rod 11 is fixedly connected to the box body 10, and the bottom of the fixed rod 11 is inserted and fixed at a preset soil body 13; the The bracket 12 is fixed to the fixing rod 11 to support the fixing rod 11 and keep it stable.

In this embodiment, the fixed rod 11 fixes the angle sensor 9 at a suitable distance from the head of the anchor rod 6 to increase the deflection angle of the measuring rope (rope body 8 ) during the test and improve the test accuracy. The head is connected to the angle sensor 9 box, and the bottom is inserted and fixed on the soil that is not affected by the test. The bracket 12 is a lockable movable triangular bracket 12, and the bottom of the bracket 12 has a foot support to provide a larger contact area. After the fixing rod 11 is inserted into the soil, the bracket 12 is used to support the fixing rod 11 to keep the whole measuring device stable. The fixed rod 11 is preferably a retractable rigid metal rod, the head is connected with the angle sensor 9, and the bottom can be inserted and fixed in the field that is not affected by the test. The fixed rod 11 after being inserted into the soil is supported by the bracket 12, so that the whole device does not generate shaking or displacement that affects the test result during the test. Therefore, in the whole test, it can be ensured that in the test process, there is no other displacement affecting the test result except the displacement of the anchor rod 6 being pulled out.

The rope measuring device 7 is fixedly connected with the anchor rod 6 through a hoop. The rope body 8 is a flexible measuring rope with scale marks made of steel strands.

In this embodiment, the measuring rope (rope body 8) is a flexible measuring rope with scale marks made of steel strands. When the anchor rod 6 is pulled out, a section of the measuring rope will be pulled out from the measuring rope box accordingly. Because the pulling force of the measuring rope is very small, the elastic deformation of the measuring rope caused by the force is negligible. The rope measuring device 7 and the anchor rod 6 have a stable and reliable connection without deflection, which can be realized by a hoop. During the test, the installation position of the measuring rope should be adjusted so that the measuring rope can stretch naturally. The measuring rope should not be too long, and the pull-out length of the initial measuring rope should be controlled within 50-100cm. The stable connection between the box body 10 and the head of the anchor rod 6 is achieved by a hoop, and this effect can also be achieved by using a connection method such as a rubber valve.

Referring to FIG. 1 , the present invention also provides an anchor head displacement measurement system, which includes the above-mentioned anchor head displacement measurement device, an anchor rod 6 , an anchor 5 , a jack 4 and a pressure bearing plate 3 ; the anchor rod 6 The other end is inserted into the preset anchoring soil 1, the anchor 5 and the jack 4 are respectively sleeved on the anchor rod 6, and the bearing plate 3 is arranged on the jack 4 and the anchoring soil between the support surfaces 2 provided by the body 1 .

The essence of the displacement of the anchor head is the change of the position of the anchor head. The device decomposes the change of the position of the anchor head into the change of distance and the change of angle for measurement, and the change of distance is combined with the change of angle to perform trigonometric function transformation, and then the anchor head can be obtained. the exact displacement. In this regard, the present invention provides a method for measuring the displacement of the anchor head, which is realized by the above-mentioned device for measuring the displacement of the anchor head, and includes steps S1-S3:

S1, read the initial reading L1 of the rope body 8; wherein the initial reading L1 is the length of the rope body 8 initially pulled out and the connection between the angle sensor 9 and the rope body 8 to the spherical center of the angle sensor 9 the sum of the lengths.

In this embodiment, please refer to FIG. 2 for the beginning of the test. FIG. 2 is an initial schematic diagram of the experiment of an anchor head displacement measuring device provided by the present invention; read the initial reading L1 of the rope body 8 . L1 and L2 should be the sum of "the length of the measuring rope pulled out" and "the length from the connection between the angle sensor 9 and the measuring rope to the center of the angle sensor 9", so the scale mark of the measuring rope can be changed from "the connection between the angle sensor 9 and the measuring rope" Length to the center of the sphere of the angle sensor 9" starts to remember.

S2. Apply a test force to the rope body 8. After the test force is applied, read the current reading L2 of the rope body 8 and the deflection angle ∠α of the rope body 8 shown by the angle sensor 9; The reading L2 is the sum of the currently pulled length of the rope body 8 and the length from the connection between the angle sensor 9 and the rope body 8 to the spherical center of the angle sensor 9 .

In this embodiment, refer to FIG. 3 at the end of the test, and FIG. 3 is a schematic diagram of the end of the experiment of an anchor head displacement measuring device provided by the present invention. At this time, the rope body 8 reads L2, and the deflection angle ∠α of the measuring rope shown by the angle sensor 9 is read. At this time, L1, L2, and anchor head displacement L3 form a triangle.

S3. Using the triangular cosine theorem cosα=(L1 ² +L2 ² -L3 ² )/(2*L1*L2), the anchor head displacement L3 is calculated.

In this embodiment, the anchor head displacement L3 can be solved by using the triangular cosine theorem cosα=(L1 ² +L2 ² -L3 ² )/(2*L1*L2). During the test, there may be a problem that the deflection angle α is too small due to the excessive length of L1 and L2, so the angle sensor 9 box is fixed at a position closer to the anchor head with the fixing rod 11, so as to control the rope body 8 The initial reading L1, so that it will not affect the test accuracy too much.

Preferably, the anchor head displacement measurement method further comprises step S4:

S4. Keep the rope body 8 and the angle sensor 9 on the same straight line so that the deflection direction of the angle sensor 9 is consistent with the pull-out direction of the anchor rod 6 .

In this embodiment, it is ensured that the rope body 8 and the angle sensor 9 are always kept in the same straight line during the test process, and the deflection direction of the angle sensor 9 is also guaranteed to be consistent with the pull-out direction of the anchor rod 6 .

To sum up, the principle adopted in the present invention is simple and direct, and the displacement of the anchor head is measured by measuring the two sides of the triangle and the included angle thereof, and calculating the length of the third side. Compared with the existing reference beam structure, the device is simple to erect, especially when some slope and foundation pit support tests are carried out, the feature of low site demand can improve the work efficiency. When the nodes are connected well, the device does not have the problems of easy slippage of the dial indicator and shaking of the reference beam in the traditional method, which improves the accuracy of the test. Compared with the traditional benchmark beam method, the erection is convenient and the site requirements are low, and the entire anchor head displacement measuring device can be stabilized only by fixing the "measuring device fixing rod 11". On this basis, the principle of the triangle is used to measure and read the displacement of the anchor head, because the fixed point of the rope measuring box and the fixed point of the angle sensor 9 of the present invention are all fixed connection nodes, which can be directly read compared to the traditional dial indicator. The displacement method of the anchor head can effectively reduce the test errors due to the slip of the dial indicator head, the torsion of the magnetic base, and the shaking of the reference beam.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. An anchor head displacement measuring device is characterized by comprising a rope measuring device, a rope body, an angle measuring device and a supporting device;

the rope measuring device is used for retracting the rope body, locking the length of the rope body and reading the length, and is fixed at one end of the anchor rod and connected with one end of the rope body;

the angle measuring device is used for measuring the angle change of the rope body in the pulling-out process of the anchor rod, and the angle measuring device is connected with the other end of the rope body and fixedly connected to the supporting device;

the supporting device is used for being fixed at a preset soil body.

2. The anchor head displacement measuring device of claim 1, wherein the cable measuring device is fixedly connected with the anchor rod through a hoop.

3. The anchor head displacement measuring device of claim 1, wherein the angle measuring device comprises an angle sensor and a box;

the angle sensor is arranged in the box body and can move in the box body to measure the angle change of the rope body in the process of pulling out the anchor rod, the angle sensor is connected with the other end of the rope body, and the box body is fixedly connected with the supporting device.

4. The anchor head displacement measuring device of claim 3, wherein the support means comprises a fixing rod and a bracket;

the top end of the fixed rod is fixedly connected to the box body, and the bottom of the fixed rod is inserted into and fixed at a preset soil body; the bracket is fixed to the fixing rod to support and stabilize the fixing rod.

5. The anchor head displacement measuring device of claim 1, wherein the rope body is a flexible, graduated-mark measuring rope made of steel strands.

6. An anchor head displacement measuring system, comprising the anchor head displacement measuring device of any one of claims 1 to 5, an anchor rod, an anchor, a jack, and a bearing plate;

the anchor rod is characterized in that the other end of the anchor rod is inserted into a preset anchoring soil body, the anchor and the jack are respectively sleeved on the anchor rod, and the bearing plate is arranged between the jack and a supporting surface provided by the anchoring soil body.

7. An anchor head displacement measuring method implemented by using the anchor head displacement measuring device according to any one of claims 1 to 5, comprising:

reading an initial reading L1 of the rope body;

applying a test force to the rope body, and reading out the current reading L2 of the rope body and the rope body deflection angle alpha shown by the angle sensor after the application of the test force is finished;

using the cosine theorem of triangle cos α ═ (L1)²+L2²-L3²) (2 x L1 x L2), anchor head displacement L3 was calculated.

8. The method of claim 7, wherein the initial reading of the line body, L1, is:

the initial reading L1 is the sum of the length of the rope body initially pulled out and the length from the connection part of the angle sensor and the rope body to the spherical center of the angle sensor.

9. The method of claim 7, wherein the initial reading of the line body, L2, is:

the initial reading L2 is the sum of the length of the rope body currently pulled out and the length from the joint of the angle sensor and the rope body to the spherical center of the angle sensor.

10. The anchor head displacement measurement method of claim 7, further comprising:

and keeping the rope body and the angle sensor on the same straight line so that the deflection direction of the angle sensor is consistent with the pulling-out direction of the anchor rod.

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