CN216110723U - Shield tunnel convergence monitoring device - Google Patents

Abstract

The utility model relates to a shield tunnel convergence monitoring device. The technical scheme of the utility model is as follows: the utility model provides a shield tunnel convergence monitoring devices which characterized in that: the device is provided with a laser range finder, a fixed shell and a long concrete nail; the long concrete nail is fixed at a reference point O on one side of the tunnel, the nail head of the long concrete nail is exposed outside, the nail head of the long concrete nail is a semicircular disc-shaped structure with an arc surface facing to the other side of the tunnel, the diameter of the semicircular disc-shaped structure is M, and the thickness of the semicircular disc-shaped structure is N; the laser range finder is provided with the fixed shell, the fixed shell is provided with a positioning hole matched with the nail head of the long concrete nail, the length of the positioning hole is smaller than M, and the width of the positioning hole is N.

Description

Shield tunnel convergence monitoring device

Technical Field

The utility model relates to a shield tunnel convergence monitoring device. The method is suitable for the field of shield tunnel segment clearance convergence measurement.

Background

Clearance convergence is also called clearance deformation, and refers to the phenomenon that the surrounding rock mass invades into the clearance of the tunnel after the tunnel is excavated, and generally refers to the change of the relative position between two points on the periphery of the tunnel. The convergence of the subway tunnel segment is generally measured by using instruments or sensors such as a laser range finder, a convergence meter and a total station. The most used is a handheld laser range finder, the nominal precision is less than +/-1 mm, the requirement of urban rail transit engineering monitoring technical specification is better than +/-2 mm, the measurement principle is that emitted laser is reflected by a measured object and then is received by the range finder, the range finder simultaneously records the round-trip time of the laser, and half of the product of the light speed and the round-trip time is the distance between the range finder and the measured object.

The handheld laser range finder is mainly used for framing the placement position of the laser range finder by arranging an L mark on one side of an evacuation platform and testing the center of the cross wire on the opposite side. The test result is influenced by factors such as the proficiency of testers, the orientation of the instrument screen, hand shaking when the button is pressed during collection, whether the instrument is attached to the tunnel pipe wall and the like, and the measurement error is large, so that the reported data cannot truly reflect the actual tunnel convergence deformation.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: to solve the existing problems, the shield tunnel convergence monitoring device is provided.

The technical scheme adopted by the utility model is as follows: the utility model provides a shield tunnel convergence monitoring devices which characterized in that: the device is provided with a laser range finder, a fixed shell and a long concrete nail;

the long concrete nail is fixed at a reference point O on one side of the tunnel, the nail head of the long concrete nail is exposed outside, the nail head of the long concrete nail is a semicircular disc-shaped structure with an arc surface facing to the other side of the tunnel, the diameter of the semicircular disc-shaped structure is M, and the thickness of the semicircular disc-shaped structure is N;

the laser range finder is provided with the fixed shell, the fixed shell is provided with a positioning hole matched with the nail head of the long concrete nail, the length of the positioning hole is smaller than M, and the width of the positioning hole is N.

The utility model has the beneficial effects that: the laser range finder is provided with the fixed shell, accurate positioning is realized by matching the positioning hole on the fixed shell with the nail head of the long concrete nail, and the inclination angle of the laser range finder can be properly adjusted by matching with the arc surface of the nail head.

Drawings

Fig. 1 is a schematic structural diagram of the embodiment.

Fig. 2 is a schematic structural view of a long concrete nail in the embodiment.

Fig. 3 is a schematic end view of the stationary housing in the embodiment.

1. Long concrete nails; 2. a stationary housing; 21. positioning holes; 3. long concrete nails; 31. a nail head; 4. an initial tunnel profile; 5. and (5) deforming the tunnel profile.

Detailed Description

The embodiment is a shield tunnel convergence monitoring device, which is provided with a laser range finder, a fixed shell, a long concrete nail and the like.

In this example, the long concrete nail is fixed at a reference point O on one side of the tunnel, the nail head of the long concrete nail is exposed outside, the nail head of the long concrete nail is a semicircular disc-shaped structure with an arc surface facing to the other side of the tunnel, the diameter of the semicircular disc-shaped structure is M, and the thickness of the semicircular disc-shaped structure is N. In this embodiment, a cross wire is arranged at a test point I corresponding to the reference point O on the other side of the tunnel.

Install fixed casing on the laser range finder in this embodiment, set up the rectangular locating hole with the pin fin looks adaptation of long concrete nail on the terminal surface of fixed casing keeping away from laser range finder work end, the length of this locating hole is less than M, and the width is N.

The specific measurement method used in this example is as follows:

installing a laser range finder on a reference point O, matching a positioning hole of a fixed shell on the laser range finder with a nail head of a long concrete nail at the reference point O to realize positioning, and taking the position I of a cross wire measuring point and the distance from the measuring reference point to the measuring point as an initial value;

when the central point of the cross wire moves to a position I ' along with the measuring point, the laser range finder is installed at the nail head position again, and the distance from a reference point O ' to the position I ' is measured and used as a test value;

and comparing the test value of the distance between the two positions with the initial value of the distance between the two positions, and calculating the relative convergence of the measuring points.

The present embodiment utilizes a laser range finder to measure the distance from a reference point (the surface of the nail head) to a test point (the center of the cross-hair) and the variation thereof. Assuming that the distance between the test point i and the reference point O is l1, and the distance between the test point i ' and the reference point O ' is l2, the distance change Δ X between the test point i ' and the test point i can be calculated by the following formula: Δ X ═ l2-l 1.

According to the embodiment, the laser range finder is fixed on the fixed shell, the long concrete nails are installed on the waist of the evacuation platform side of the tunnel, the range finder with the fixed shell is placed at the nail head position and horizontally aligned to the other side of the tunnel, the position of a laser spot is used as the central point position of a cross wire, and paint is sprayed; the tunnel structure deforms from the initial tunnel profile to the deformed tunnel profile after deformation, the center of the cross wire displaces, and the distance between the test point and the reference point is measured by adopting the measuring device of the embodiment, so that the convergence deformation of the tunnel is obtained.

The above-mentioned embodiments are only used for explaining the inventive concept of the present invention, and not for limiting the protection of the claims of the present invention, and all the insubstantial modifications of the present invention using this concept shall fall within the protection scope of the present invention.

Claims (1)

1. The utility model provides a shield tunnel convergence monitoring devices which characterized in that: the device is provided with a laser range finder, a fixed shell and a long concrete nail;

the long concrete nail is fixed at a reference point O on one side of the tunnel, the nail head of the long concrete nail is exposed outside, the nail head of the long concrete nail is a semicircular disc-shaped structure with an arc surface facing to the other side of the tunnel, the diameter of the semicircular disc-shaped structure is M, and the thickness of the semicircular disc-shaped structure is N;

the laser range finder is provided with the fixed shell, the fixed shell is provided with a positioning hole matched with the nail head of the long concrete nail, the length of the positioning hole is smaller than M, and the width of the positioning hole is N.

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