Asymmetric rigidity adjusting type displacement inclinometry device and system and installation method of asymmetric rigidity adjusting type displacement inclinometry device

Abstract

The invention relates to the technical field of displacement monitoring of constructional engineering, and provides an asymmetric rigidity adjusting type displacement inclinometry device and system and an installation method. The inner wall of the joint-free pipe body is provided with axial guide grooves which are uniformly distributed in the circumferential direction, and the outer wall of the joint-free pipe body is provided with a conical hole; the metal rods with different lengths penetrate through the axial full length of the pipe body, and the lengths are configured according to elastic modulus gradients of soil bodies with different depths; the extending direction of the guide groove is parallel to the axis of the metal bar. During installation, axial continuous penetration of the conical hole is realized through the joint-free pipe body, so that the metal bars are continuously arranged in a layered manner along the depth of a soil layer. According to the device, the problems of leakage, torsion and soil body-pipe body deformation mismatch of a traditional inclinometer pipe are solved through the synergistic effect of an integrated structure and elastic modulus matching type rigidity adjustment.

Claims

1. Asymmetric stiffness adjustment type displacement inclinometer, characterized in that: Comprising: A jointless one-piece pipe body (4), with at least two groups of axially extending guide grooves (1) evenly distributed circumferentially on its inner wall, and a plurality of axially continuously penetrating tapered holes (2) evenly distributed circumferentially on its outer wall, the aperture of the tapered holes (2) shrinking in a radial gradient; Metal rods (3) with different lengths, inserted into the tapered holes (2) and penetrating the entire axial length of the pipe body (4), the axial length difference between adjacent metal rods (3) ≥ 10 cm, and the lengths of the metal rods (3) are configured according to the elastic modulus gradient of the soil at different depths of the monitoring holes, so that the stiffness of the pipe body (4) matches the soil deformation modulus; The extending direction of the guide grooves (1) is parallel to the axis direction of the metal rods (3), and the guide grooves (1) and the tapered holes (2) are arranged corresponding to the same angle circumferentially on the pipe body (4).

2. The asymmetric stiffness-adjustable displacement inclinometer according to claim 1, characterized in that: The number of the guide grooves (1) and the tapered holes (2) is 4 groups each, and they are evenly distributed at 90°.

3. The asymmetric stiffness-adjustable displacement inclinometer according to claim 1, characterized in that: The length configuration of the metal rods (3) satisfies: When the soil elastic modulus E ≤ 100 MPa, the configured length L ≥ 1.7 m; When the soil elastic modulus E ≥ 500 MPa, the configured length L ≤ 1.5 m, and the axial length difference between adjacent metal rods satisfies |L1 - L2| / L1 ≥ 15%.

4. The asymmetric stiffness-adjustable displacement inclinometer according to claim 1, characterized in that: The tapered holes (2) are filled with a cured filling layer.

5. The asymmetric stiffness-adjustable displacement inclinometer according to claim 1, characterized in that: The pipe body (4) is made of cross-linked polyethylene material, and its outer wall is composite with a metal mesh layer (5).

6. The asymmetric stiffness-adjustable displacement inclinometer according to claim 5, characterized in that: Circumferential restraint members (6) are arranged at intervals outside the metal mesh layer (5).

7. The asymmetric stiffness-adjustable displacement inclinometer according to claim 1, characterized in that: A base (7) is integrally formed at the bottom of the pipe body (4).

8. A displacement monitoring system, characterized in that: Comprising: The asymmetric stiffness adjustment type inclinometer device according to any one of claims 1 - 7; An inclinometer sensor, adapted to the guide grooves (1) and moving axially along them.

9. A method for installing the asymmetric stiffness-adjustable displacement inclinometer according to any one of claims 1 to 7, characterized in that: Comprising: S1. Lower the pipe body (4) into the monitoring hole, aligning the guide grooves (1) with the preset monitoring direction; S2. According to the elastic modulus data of the soil at different depths, insert the metal rods (3) with different lengths into the tapered holes (2) along the entire axial length of the pipe body (4) in layers, forming a stiffness adjustment structure with circumferential asymmetry and axial gradient distribution; S3. Inject filling material into the tapered holes (2) and cure it to form a fixing layer for the metal rods (3); S4. Align the guide wheels of the inclinometer sensor with the guide grooves (1) and lower it.

10. The installation method according to claim 9, characterized in that: The lengths of the metal rods (3) are configured according to a predefined correspondence relationship according to the soil elastic modulus E: When E ≤ 100 MPa, L ≥ 1.7 m; When 100 MPa < E < 500 MPa, L = 1.5 - 1.7 m; ​

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