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Isolation structure and construction method of fully bonded bolt stress gauge in rock tunnel

A bolt stress gauge and isolation structure technology, which is used in the installation of bolts, earthwork drilling, mining equipment, etc., can solve the problems of affecting accuracy, failure and separation of steel bar stress gauges, etc., to speed up the pouring speed, prevent failure, Small footprint effect

Active Publication Date: 2019-11-19
ZHEJIANG PROVINCE INST OF ARCHITECTURAL DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex environment of the construction site, various construction vibrations and environmental vibrations are transmitted to the steel bar stress gauge through the anchor rod and mortar, which affects the accuracy of the detection, and even causes the steel bar stress meter to be separated from the main steel bar, resulting in the failure of the steel bar stress meter
However, there is currently no effective method for protecting the full-length bonded anchor rebar stress gauges

Method used

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  • Isolation structure and construction method of fully bonded bolt stress gauge in rock tunnel
  • Isolation structure and construction method of fully bonded bolt stress gauge in rock tunnel
  • Isolation structure and construction method of fully bonded bolt stress gauge in rock tunnel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A kind of isolation structure of fully bonded bolt stress gauge of rock mass tunnel (see attached figure 1 , attached figure 2 ), including the anchor body 1 poured by reinforced concrete, the steel bar 2 near the outer end of the anchor body is connected to the steel bar stress gauge 3, and the steel bar stress gauge is covered with a spacer 4 for isolating the concrete and steel bar stress gauge. The front and rear ends of the sleeve are tightly fitted on the outer wall of the steel bar, the front end of the spacer is set in front of the steel bar stress gauge, and the rear end of the spacer is set behind the steel bar stress gauge. The steel bar is disconnected from the connection position of the steel bar stress gauge, and the two ends of the broken steel bar are respectively welded to the two ends of the steel bar stress gauge. The isolation sleeve is a PVC pipe, and an isolation gap 5 is provided between the inner wall of the PVC pipe and the outer...

Embodiment 2

[0031] Embodiment 2: A kind of isolation structure of fully bonded bolt stress gauge of rock mass tunnel (see attached image 3 ), its structure is similar to that of Example 1, the main difference is that the isolation sleeve in this embodiment is an airbag sleeve, the two ends of the airbag sleeve are set on the outer wall of the steel bar, and the airbag sleeve is connected to the inflatable tube 7, and the inflatable tube extends out of the bolt body At the end, a control valve is installed on the inflation pipe.

[0032] The airbag cover has a double-layer structure, including an inner layer cover 8 and an outer layer cover 9. The front end of the inner layer cover and the outer layer cover are connected to form an integrated structure, and the rear end of the inner layer cover and the outer layer cover is connected to form an integrated structure. The cavity between the cover and the outer cover is connected, and the front and rear ends of the airbag cover are gathered t...

Embodiment 3

[0033] Embodiment 3: A kind of isolation structure of fully bonded bolt stress gauge of rock mass tunnel (see attached Figure 4 to attach Image 6 ), its structure is similar to that of Example 1, the main difference is that the isolation sleeve in this embodiment is an airbag sleeve, the two ends of the airbag sleeve are set on the outer wall of the steel bar, and the airbag sleeve is connected to the inflatable tube 7, and the inflatable tube extends out of the bolt body At the end, a control valve is installed on the inflation pipe.

[0034] The airbag cover has a single-layer structure, and the inflation tube communicates with the cavity between the inner wall of the airbag cover and the outer wall of the steel bar stress gauge. It includes a connecting support 11, a locking support 12, and a supporting rod 13. One end of the supporting rod is hinged on the connecting support, and the other end is provided with an arc-shaped supporting head 14, which is installed between...

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Abstract

The invention discloses an isolation structure of a full-bonded anchor stress meter for a rock mass tunnel and a construction method and aims at solving the problem that a steel bar stress meter installed on a bolt support is affected by the environment, construction vibration, environmental vibration and the like are transferred to the steel bar stress meter through an anchor rod and mortar affect the detection accuracy, and even cause the steel bar stress meter to be separated from a main steel bar, resulting in the failure of the steel bar stress meter. The isolation structure comprises a bolt body cast from reinforced concrete, and the steel bar stress meter is connected to a steel bar near the outer end in the bolt body. The steel bar stress meter is sleeved with an isolation sleeve for isolating the concrete and the steel bar stress meter. The front end and the rear end of the isolation sleeve are arranged on the steel bar outer wall closely. The front end of the isolation sleeveis placed in front of the steel bar stress meter, and the rear end of the isolation sleeve is placed behind the steel bar stress meter.

Description

technical field [0001] The invention relates to a bolt support technology, more specifically, it relates to an isolation structure and a construction method of a fully bonded bolt stress gauge in a rock mass tunnel. Background technique [0002] Bolt support refers to a reinforcement support method used in geotechnical engineering such as slopes, deep foundation pits, tunnels, etc. The bolt is generally made of steel bars, inserted into the drill hole, and the full length of the bolt body is bonded to the rock mass by pouring cement mortar into the hole, so that the bolt body and the rock mass are jointly stressed, and the anchor body and the rock mass are jointly stressed. Go through the rock formation and enter the hard soil layer to realize the anchoring and supporting effect of the bolt on the rock formation. In order to analyze the stress of the anchor rod to judge the safety of the project, the full-length bonded anchor rod usually needs to measure the stress of the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/00E21D21/02E21D20/02
CPCE21D20/003E21D20/021E21D21/0006E21D21/0093E21D21/02
Inventor 刘兴旺孙政波曹国强
Owner ZHEJIANG PROVINCE INST OF ARCHITECTURAL DESIGN & RES