CN210086324U - A high-precision ruler device for measuring the horizontal displacement change of foundation pit pile top by line of sight method - Google Patents

Abstract

The utility model discloses a look high accuracy scale device that alignment method measured foundation ditch pile bolck horizontal displacement and changed, include: basic measuring platform, calibrating device, the flexible centering rod in lower part, flexible landing leg, the flexible centering rod in upper portion and slide caliper, its characterized in that, four flexible landing legs are installed respectively to basic measuring platform's bottom angular point position, basic measuring platform's top is equipped with the flexible centering rod in upper portion, basic measuring platform's below is equipped with the flexible centering rod in lower part, the flexible centering rod in upper portion and the flexible centering rod in lower part all perpendicular to basic measuring platform, the basic measuring platform upper surface is equipped with calibrating device and slide caliper. The device has simple structure and simple operation, and can realize the measurement of submillimeter precision.

Description

A high-precision ruler device for measuring the horizontal displacement change of foundation pit pile top by line of sight method

technical field

The utility model belongs to the technical field of foundation pit engineering monitoring, in particular to a high-precision ruler device for measuring the horizontal displacement change of a foundation pit pile top by a sight line method.

Background technique

There are many foundation pit projects in the fields of architecture, municipal and rail transit engineering. During the excavation process of the foundation pit, there are various types of deformation such as horizontal displacement and settlement. The horizontal displacement monitoring of the pile top of the foundation pit enclosure is the deformation An important work of monitoring, especially for the monitoring of deep foundation pit projects.

There are many methods for monitoring the horizontal displacement of the pile top of the foundation pit enclosure: the forward intersection method, the rear intersection method, the wire method, the GNSS method, and the sight line method. The sight line method is one of the most commonly used methods in foundation pit engineering monitoring. It uses observation instruments (such as total stations) to give a fixed straight line in the displacement direction perpendicular to the horizontal displacement monitoring point. A steel plate ruler with scale is placed in the direction of the monitoring point and the fixed line, the measuring drill slides on the steel plate ruler, and the distance from the monitoring point to the fixed line is recorded. After a unit period of monitoring, the displacement change of the monitoring point is monitored. The change value of the horizontal distance from the point to the fixed line. This method is simple to operate, and the response displacement changes are clear, but there are large errors and low precision.

At present, the main problems of this traditional method are:

1. When observing from a long distance, it is difficult to distinguish the center of the drill, resulting in aiming error;

2. There is no horizontal and vertical correction device when the measuring drill is placed, and it is placed only by human feeling, and the error is large;

3. The steel ruler is placed horizontally, without a horizontal correction device, which is not accurate enough;

4. When the steel ruler is placed perpendicular to the fixed line (sight line), it is placed only by human feeling, and it is often not absolutely perpendicular to the sight line, and the measured displacement is not necessarily perpendicular to the direction of the foundation pit;

5. The accuracy of the steel plate ruler is 1mm, which is low in accuracy. For foundation pits with higher monitoring levels, it is difficult to meet the monitoring requirements.

SUMMARY OF THE INVENTION

The purpose of the utility model is to overcome the deficiencies of the prior art, and to provide a high-precision scale device for measuring the horizontal displacement change of the pile top of the foundation pit by the sight line method.

The utility model is achieved through the following technical solutions:

A high-precision ruler device for measuring the horizontal displacement change of a foundation pit pile top by a sight line method, comprising: a basic measurement platform, a calibration device, a lower telescopic centering rod, a telescopic outrigger, an upper telescopic centering rod and a vernier caliper, characterized in that Four telescopic outriggers are respectively installed at the bottom corners of the basic measurement platform, an upper telescopic centering rod is arranged above the basic measurement platform, and a lower telescopic centering rod is arranged below the basic measurement platform, The upper telescopic centering rod and the lower telescopic centering rod are both perpendicular to the basic measurement platform, and the upper surface of the basic measurement platform is provided with a calibration device and a vernier caliper;

The vernier caliper includes a vernier caliper pointer, a vernier caliper digital display screen and a vernier caliper scale surface, and the vernier caliper is embedded in the center of the upper surface of the basic measurement platform along the length direction;

The top of the upper telescopic centering rod is installed with a sighting cross target plate and a prism, the bottom of the upper telescopic centering rod is fixedly connected with the vernier caliper pointer, and the upper telescopic centering rod can slide back and forth with the vernier caliper pointer;

The top end of the lower telescopic centering rod is fixed on the bottom end of the basic measuring platform, and is located at the top of the zero point of the vernier caliper.

In the above technical solution, the basic measurement platform is rectangular.

In the above technical solution, the calibration device comprises: a circular vial, a first vial and a second vial.

In the above technical solution, the circular level bubble is located at the corner position of the upper surface of the basic measurement platform, the first level tube is located at the middle position of the short side of the upper surface of the basic measurement platform, and the second level tube is located at the basic measurement platform. At the middle of the long side of the upper surface of the platform.

In the above technical solution, the first vial and the second vial are perpendicular to each other.

In the above technical solution, the precision of the vernier caliper is sub-millimeter precision.

In the above technical solution, the bottom of the telescopic outrigger is tapered.

In the above technical solution, a height adjuster is installed on the telescopic outrigger.

In the above technical solution, the lower telescopic centering rod is a hollow structure, which can be connected with the horizontal displacement monitoring point.

In the above technical solution, the upper telescopic centering rod is provided with a second adjusting screw whose height can be adjusted, and the lower telescopic centering rod is provided with a first adjusting screw whose height can be adjusted.

The beneficial effects of the present utility model are:

The high-precision ruler device of the utility model for measuring the horizontal displacement change of the pile top of the foundation pit by the sight line method ensures the absolute level of the entire foundation measurement platform through the multi-point positioning of a plurality of leveling pipes and leveling bubbles; the prism rod at the bottom of the platform It forms a seamless connection with the monitoring point directly, which avoids the artificial alignment error and greatly improves the measurement accuracy.

At the same time, the adjustment process of the observation platform can be completed at one time, which reduces the manual adjustment time and greatly improves the work efficiency.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the top view of the utility model;

Fig. 3 is the front view of the utility model;

Fig. 4 is the left side view of the utility model;

FIG. 5 is a schematic diagram of the application of the present invention.

in:

1: Basic measuring platform, 2: Calibration device, 2-1: Circular vial, 2-2: First vial, 2-3: Second vial, 3: Lower telescopic centering rod, 4: First adjustment Screw, 5: Telescopic Outrigger, 6: Height Adjuster, 7: Upper Telescopic Centering Rod, 8: Second Adjustment Screw, 9: Sight Cross Target, 10: Prism, 11: Vernier Caliper, 11-1: Vernier Caliper Pointer, 11-2: Vernier caliper digital display, 11-3: Digital vernier scale surface.

For those of ordinary skill in the art, other related drawings can be obtained from the above drawings without any creative effort.

Detailed ways

In order to make those skilled in the art better understand the solution of the present invention, the technical solution of the present invention is further described below with reference to specific embodiments.

Example 1

A high-precision scale device for measuring the horizontal displacement change of a foundation pit pile top by a sight line method, comprising: a basic measuring platform 1, a calibration device 2, a lower telescopic centering rod 3, a telescopic outrigger 5, an upper telescopic centering rod 7 and The vernier caliper 11 is characterized in that four telescopic outriggers 5 are respectively installed at the bottom corner positions of the basic measuring platform 1, an upper telescopic centering rod 7 is arranged above the basic measuring platform 1, and a lower part is arranged below the basic measuring platform 1 The telescopic centering rod 3, the upper telescopic centering rod 7 and the lower telescopic centering rod 3 are all perpendicular to the basic measuring platform 1, and the upper surface of the basic measuring platform 1 is provided with a calibration device 2 and a vernier caliper 11;

The vernier caliper 11 includes a vernier caliper pointer 11-1, a vernier caliper digital display screen 11-2 and a vernier caliper scale surface 11-3, and the vernier caliper 11 is embedded in the center of the upper surface of the basic measuring platform 1 along the length direction;

The top of the upper telescopic centering rod 7 is installed with a sighting cross 9 and a prism 10, the bottom of the upper telescopic centering rod 7 is fixedly connected with the vernier caliper pointer 11-1, and the upper telescopic centering rod 7 can slide back and forth with the vernier caliper pointer 11-1 ;

The top end of the lower telescopic centering rod 3 is fixed on the bottom end of the basic measuring platform 1 and is located at the top of the zero point of the vernier caliper.

The use method of the device in this embodiment is:

When monitoring the horizontal displacement of the pile top of the foundation pit enclosure, see Figure 5. The rectangle in the figure represents the foundation pit. For example, measure the monitoring points between AB on one side of the foundation pit (the number of monitoring points is multiple, along AB, etc. The distance is arranged, the monitoring point is usually a small steel column built on the foundation), C is the observation instrument (total station), D is the erected reference prism, and CD is the displacement direction perpendicular to the horizontal displacement monitoring point. a fixed straight line. When monitoring, the device is placed above the monitoring point, the lower telescopic centering rod 3 is inserted into the monitoring point, and then the four telescopic outriggers 6 are adjusted respectively to calibrate the calibration device 2 to ensure that the entire basic measurement platform 1 is at an absolute level. state, then adjust the upper telescopic centering rod 7 to make the aiming cross 9 and prism 10 face the measuring instrument (total station), and then slide the vernier caliper pointer 11-1 along the slide of the vernier caliper 11 until it is in the objective lens of the measuring instrument The prism 10 in the sighting part can be seen completely, and the reticle of the prism 10 and the reticle in the objective lens of the measuring instrument are completely coincident, and then the reading on the digital display screen 11-2 of the downstream caliper is recorded. According to the monitoring period, the displacement change of each monitoring point can be monitored by regular monitoring according to the above method.

Example 2

On the basis of Embodiment 1, the basic measurement platform 1 is rectangular. The calibration device 2 includes: a circular vial 2-1, a first vial 2-2 and a second vial 2-3. The circular level bubble 2-1 is located at the corner position of the upper surface of the basic measurement platform 1, the first level tube 2-2 is located at the middle position of the short side of the upper surface of the basic measurement platform 1, and the second level tube 2-3 is located at the basic measurement platform. 1 at the middle of the long side of the upper surface. The first vial 2-2 and the second vial 2-3 are perpendicular to each other.

When calibrating the calibration device 2, observe the bubbles in the circular vial 2-1, the first vial 2-2 and the second vial 2-3, and adjust the telescopic legs 6 to make the bubbles in the middle position.

Example 3

On the basis of Embodiment 2, the precision of the vernier caliper 11 is sub-millimeter precision. It has high precision and can meet the monitoring requirements for foundation pits with higher monitoring levels.

Example 4

On the basis of Example 3, the bottom of the telescopic outriggers 5 is tapered. When measuring the foundation pit, it is generally soil ground with soft texture. The bottoms of the telescopic outriggers 5 are designed to be tapered, which is more convenient for fixing devices. A height adjuster 6 is installed on the telescopic outrigger 5 to facilitate the adjustment of the calibration device 2 . The upper telescopic centering rod 7 is provided with a second adjusting screw 8 that can be adjusted in height. Loosen the second adjusting screw 8 to adjust the length and angle of the upper telescopic centering rod 7, and then tighten the second adjusting screw 8 to fix the upper telescopic centering. Rod 7.

By adjusting the second adjusting screw 8 installed on the upper telescopic centering rod 7, the height and the angle are adjusted so that the sighting cross target 9 and the prism 10 face the measuring instrument (total station).

The lower telescopic centering rod 3 is provided with a first adjusting screw 4 whose height can be adjusted. Loosen the first adjusting screw 4 to adjust the length of the lower telescopic centering rod 3, and then tighten the first adjusting screw 4 to fix the lower telescopic centering rod 3. , so that the lower telescopic centering rod 3 can be docked with the horizontal displacement monitoring point.

The lower telescopic centering rod 3 is a hollow structure or there is a hole at the bottom of the lower telescopic centering rod 3, so that the hole or the hollow structure can be inserted into the monitoring point and docked with the horizontal displacement monitoring point (the foundation pit monitoring point is generally a steel nail or a steel column ).

The present invention has been exemplarily described above. It should be noted that, without departing from the core of the present invention, any simple deformations, modifications or other equivalent replacements that can be performed by those skilled in the art without any creative effort will fall into place. into the protection scope of the present invention.

Claims (10)

1. The utility model provides a high accuracy scale device that sighting line method measured foundation ditch pile bolck horizontal displacement and changes, includes: the device comprises a basic measuring platform (1), a calibrating device (2), a lower telescopic centering rod (3), telescopic supporting legs (5), an upper telescopic centering rod (7) and a vernier caliper (11), and is characterized in that four telescopic supporting legs (5) are respectively installed at the bottom corner positions of the basic measuring platform (1), the upper telescopic centering rod (7) is arranged above the basic measuring platform (1), the lower telescopic centering rod (3) is arranged below the basic measuring platform (1), the upper telescopic centering rod (7) and the lower telescopic centering rod (3) are perpendicular to the basic measuring platform (1), and the calibrating device (2) and the vernier caliper (11) are arranged on the upper surface of the basic measuring platform (1);

the vernier caliper (11) comprises a vernier caliper pointer (11-1), a vernier caliper digital display screen (11-2) and a vernier caliper scale surface (11-3), and the vernier caliper (11) is embedded in the center of the upper surface of the basic measuring platform (1) along the length direction;

the top of the upper telescopic centering rod (7) is provided with an alignment cross target plate (9) and a prism (10), the bottom of the upper telescopic centering rod (7) is fixedly connected with a vernier caliper pointer (11-1), and the upper telescopic centering rod (7) can slide back and forth along with the vernier caliper pointer (11-1);

the top end of the lower telescopic centering rod (3) is fixed at the bottom end of the basic measuring platform (1) and is positioned at the zero point of the vernier caliper.

2. The high-precision scale device for measuring the horizontal displacement change of the foundation pit pile top by the line-of-sight method according to claim 1, wherein the basic measuring platform (1) is rectangular.

3. A high precision scale device for measuring the horizontal displacement change of the foundation pit pile top by the line of sight method according to claim 1, wherein the calibration device (2) comprises: a round level bubble (2-1), a first level tube (2-2) and a second level tube (2-3).

4. A high-precision staff gauge device for measuring the horizontal displacement change of the foundation pit pile top by the sighting line method according to claim 3, characterized in that said round level bubble (2-1) is located at the angular point position of the upper surface of the basic measuring platform (1), said first level pipe (2-2) is located at the middle position of the short side of the upper surface of the basic measuring platform (1), and said second level pipe (2-3) is located at the middle position of the long side of the upper surface of the basic measuring platform (1).

5. A high accuracy staff gauge device for measuring foundation pit pile top horizontal displacement variation according to the collimation line method of claim 3 or 4 characterized in that, said first leveling pipe (2-2) and second leveling pipe (2-3) are perpendicular to each other.

6. The high-precision scale device for measuring the horizontal displacement change of the foundation pit pile top by the line-of-sight method according to claim 1, wherein the precision of the vernier caliper (11) is sub-millimeter precision.

7. A high precision scale device for measuring the horizontal displacement change of the foundation pit pile top by the line of sight method according to claim 1, characterized in that the bottom of the telescopic supporting leg (5) is conical.

8. A high precision scale device for measuring the horizontal displacement change of the foundation pit pile top by the line of sight method according to claim 1, characterized in that the telescopic supporting leg (5) is provided with a height adjuster (6).

9. The high-precision scale device for measuring the horizontal displacement change of the foundation pit pile top by the line-of-sight method according to claim 1, wherein the lower telescopic centering rod (3) is of a hollow structure and can be butted with a horizontal displacement monitoring point.

10. A high-precision scale device for measuring the horizontal displacement change of the pile top of the foundation pit by the line-of-sight method according to claim 1, wherein the upper telescopic centering rod (7) is provided with a second adjusting screw (8) with adjustable height, and the lower telescopic centering rod (3) is provided with a first adjusting screw (4) with adjustable height.

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