CN204040007U - Auxiliary tool for measuring horizontal deformation of foundation pit slope top by baseline method - Google Patents

Abstract

The utility model relates to an appurtenance for foundation ditch slope top horizontal deformation is measured to baseline method, with the help of this instrument, can read the reading of deformation monitoring point not on a straight line fast, can guarantee simultaneously to measurationly with the centering and the level of ruler to guarantee the precision of the horizontal displacement of measuring deformation monitoring point, this instrument easy operation, convenient, the preparation economy. The utility model discloses appurtenance that foundation ditch summit level warp is measured to baseline method includes scalable tripod and has the ruler of millimeter carving, the ruler is suitable for the upper end of installing at scalable tripod, the median of ruler is zero, and the scale interval extends to bilateral symmetry distribution from the centre, set up laser emitter in the middle of the zero scale interval of ruler, the middle department of ruler still inlays and is equipped with the air level, is equipped with the bubble in the air level.

Description

An Auxiliary Tool for Measuring the Horizontal Deformation of Foundation Pit Slope Top by Baseline Method

technical field

The utility model relates to an auxiliary tool for measuring the horizontal deformation of the top of a foundation pit by a baseline method.

Background technique

According to the requirements of my country's "Technical Specifications for Building Foundation Pit Engineering Monitoring" (GB50497-2009), foundation pits with a depth of more than 5m must be monitored for the horizontal displacement of the top of the slope. In terms of monitoring methods, the baseline method (or line of sight method) is often used. To measure the horizontal displacement of the top of the slope, the baseline method is to set the line of sight of the theodolite between two fixed points as the baseline, regularly measure the distance between the observation point and the baseline, and determine the technical method of the horizontal displacement of the observation point.

At present, this method has the following disadvantages in practical application: since the slope top of the building foundation pit is not a very neat line at the excavation site, it is difficult to place these deformation monitoring points when arranging deformation monitoring points around the slope top of the foundation pit. Arranged on a line of sight; even if the deformation monitoring point can be arranged on a line of sight, when using a straightedge for measurement, due to errors in the alignment of the straightedge, the error in the monitoring results is relatively large; in addition, when using the baseline method for measurement, Because it is difficult to keep the straightedge used for measurement horizontal, and it is also difficult to keep the straightedge perpendicular to the line of sight, resulting in errors in readings.

Utility model content

The technical problem to be solved by the utility model is to provide an auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method. With the help of this tool, the readings of the deformation monitoring points that are not on a straight line can be quickly read, and at the same time, the measurement accuracy can be guaranteed. The centering and leveling of the straightedge are used to ensure the accuracy of the measured horizontal displacement of the deformation monitoring point. The tool is simple and convenient to operate and economical to manufacture.

The auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model includes a telescopic tripod and a straightedge with millimeter markings, the straightedge is suitable for being installed on the upper end of the telescopic tripod, and the middle The value is zero, and the scale values extend symmetrically from the middle to both sides. A laser emitter is arranged in the middle of the zero scale value of the straightedge, and a level tube is embedded in the middle of the straightedge, and air bubbles are arranged in the level tube.

When monitoring, first determine two constant reference points, use theodolite to align one reference point with the other to form a reference line, and set observation points at a certain distance on the reference line. Make the first measurement: stand the theodolite at one of the reference points, aim at the other reference point, rotate the telescope vertically from top to bottom, and move the line of sight from far to near along the reference line. Align the zero scale value with the first observation point. When the observation point is relatively low from the ground, place the ruler directly on the observation point for alignment. When the observation point is a certain distance from the ground, install the ruler on the upper end of the retractable tripod. The laser emitter emits laser light to aim at the observation point, and then adjusts the telescopic tripod until the air bubble in the level tube on the straightedge is centered, so that the straightedge remains horizontal. Observe through the theodolite telescope, adjust the angle of the horizontal direction of the straightedge, and make the scale of the straightedge The line is parallel to the vertical cross wire in the telescope barrel, read the scale value on the ruler coincident with the reference line, which is the initial horizontal displacement value of the first observation point, if the selected observation point is on the reference line, the initial value is zero.

Continue to rotate the telescope vertically from top to bottom, and the line of sight continues to move along the reference line from far to near until reaching the second observation point. Operate the auxiliary tool in the same way to measure the second, third, fourth... observation points, after the set time , and then re-measure the horizontal displacement values of the first, second, third...observation points, and compare them before and after to obtain the horizontal displacement variation of the same observation point.

Further, the auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model, the scale value of the straightedge is symmetrically depicted 500mm from the zero scale value in the middle to both sides, and the straightedge is 1000mm long, 100mm wide, and thick. 10mm, not only can meet the needs of actual use, but also light and easy to carry.

Further, the auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model, the two ends of the ruler are symmetrically provided with nuts, and the ruler is installed on the upper end of the telescopic tripod through the nuts, and the detachable connection is convenient to carry .

Compared with the prior art, the auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model has the following beneficial effects:

When using the baseline method to measure the horizontal deformation of the slope top of the foundation pit, with the help of the laser transmitter on the tool, it can ensure the accurate alignment of the ruler and the observation point. By adjusting the telescopic tripod to cooperate with the level pipe, the ruler can be ensured to be horizontal, which can be quickly The readings of the deformation monitoring points that are not on a straight line are read to ensure the accuracy of the measured horizontal displacement of the deformation monitoring points. The operation is simple, convenient and economical.

The auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the top view of the straightedge in the auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the present invention. In order to ensure that the structure is clear, only the structure on the upper surface of the straightedge is shown;

Fig. 2 is the front view of the ruler in the auxiliary tool for measuring the horizontal deformation of the top of the foundation pit slope by the baseline method of the utility model;

Fig. 3 is the bottom view of the straightedge in the auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the present invention. In order to ensure that the structure is clear, only the structure located on the lower surface of the straightedge is shown;

Fig. 4 is a structural schematic diagram of the telescopic tripod in the auxiliary tool for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model.

Reference signs: 1, retractable tripod 2, ruler 3, laser transmitter 4, level tube 5, air bubble 6, nut

Detailed ways

As shown in Figures 1, 2, 3, and 4, the auxiliary tools for measuring the horizontal deformation of the slope top of the foundation pit by the baseline method of the utility model include a telescopic tripod 1 and a ruler 2 with millimeter markings, wherein the ruler is 1000mm long and 100mm wide , Thick 10mm.

The middle value of the ruler 2 is zero, and the scale value is symmetrically distributed and extended 500 mm from the middle to both sides. A laser emitter 3 is arranged in the middle of the zero scale value, and a level tube 4 is embedded in the middle of the ruler 2 . There are bubbles5.

Both ends of the ruler 2 are symmetrically provided with nuts 6, and the ruler 2 is mounted on the upper end of the telescopic tripod 1 through the nuts 6.

The above-mentioned embodiments are only described to the preferred implementation of the utility model, and are not limited to the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the utility model.

Claims (4)

1. An auxiliary tool for measuring the horizontal deformation of the top of a foundation pit by baseline method, characterized in that: it comprises a telescopic tripod (1) and a straightedge (2) with a millimeter depiction, and the straightedge (2) is suitable for installing At the upper end of the telescopic tripod (1), the middle value of the ruler (2) is zero, and the scale values extend symmetrically from the middle to both sides, and a laser emission is set in the middle of the zero scale value of the ruler (2). A level tube (4) is also embedded in the center of the ruler (3), and the level tube (4) is provided with an air bubble (5). 2. The auxiliary tool for measuring the horizontal deformation of the top of the foundation pit by baseline method according to claim 1, characterized in that: the scale value of the ruler (2) is symmetrically depicted 500mm from the zero scale value in the middle to both sides. 3. The auxiliary tool for measuring the horizontal deformation of the foundation pit slope top by the baseline method according to claim 1 or 2, characterized in that: the ruler (2) is 1000mm long, 100mm wide, and 10mm thick. 4. the auxiliary tool for measuring the horizontal deformation of the top of the foundation pit by baseline method according to claim 3, characterized in that: the two ends of the ruler (2) are symmetrically provided with nuts (6), and the ruler (2) passes through Nut (6) is installed on telescopic tripod (1) upper end.