CN211477049U - Effective grouting length test structure and system for anchor rod installation - Google Patents
Effective grouting length test structure and system for anchor rod installation Download PDFInfo
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- CN211477049U CN211477049U CN202020031049.4U CN202020031049U CN211477049U CN 211477049 U CN211477049 U CN 211477049U CN 202020031049 U CN202020031049 U CN 202020031049U CN 211477049 U CN211477049 U CN 211477049U
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Abstract
The utility model belongs to the technical field of geotechnical engineering, especially, relate to an effective grout length test structure of stock installation and system. Effective grout length test structure of stock installation includes the country rock, bore in the country rock and get the drilling of the different degree of depth, arrange the stock in the drilling, the organic glass sleeve pipe is established to the one end cover of stock in the drilling, the stock that organic glass sheathed tube length difference compares in order to form different defects, the sheathed tube internal diameter of organic glass is unanimous with the external diameter size of stock, grout between drilling and stock, the organic glass sleeve pipe. The utility model provides an effective grout length test structure of stock installation and system can realize the test of the effective grout length of stock effectively, conveniently, fast, harmless and quantitatively, need not to carry out destructive test and expensive coring test to the stock, provide effective means for geotechnical engineering's the quality evaluation of strutting.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering, especially, relate to an effective grout length test structure of stock installation and system, be applicable to among the geotechnical engineering such as needs excavation cavern, side slope in fields such as water and electricity, mine, traffic.
Background
In the construction of rock engineering such as tunnels, mines, slopes and the like, shotcrete bolts are widely used in support systems to improve or maintain the stability of the engineering. The common practice of installing rock bolts is to insert the bolt into a pre-drilled hole and then grout the hole to bond the bolt to the surrounding rock mass, thereby providing reinforcement. However, a mounting defect of the anchor rod may cause serious consequences such as collapse of the rock mass and the like. Therefore, the installation quality of the anchor rod is the key for ensuring safe and reliable operation of the engineering. The most prominent problem in the installation of the anchor is due to the non-grouted area at the top end of the anchor before the cement mortar is grouted and cured under the action of gravity. Since the grouting transfers load by creating shear strength between the bolt and the rock, the grouting length is an important component of the stabilization of the bolt system, and the ultimate load of the bolt increases as the grouting length increases and as the grouting length decreases. Therefore, in order to ensure the stability of the construction, the grouting quality of the bolt needs to be evaluated.
The quality of bolt grouting is generally checked by drawing tests or coring tests, but both methods are destructive, time-consuming and expensive, and the quality of the check is difficult to determine completely, and both methods are gradually replaced by non-destructive testing methods in engineering practice.
SUMMERY OF THE UTILITY MODEL
A first object of the utility model is to provide an effective grout length test structure of stock installation to the not enough of existence among the prior art.
To this end, the above object of the present invention is achieved by the following technical solutions:
the utility model provides an effective grout length test structure of stock installation which characterized in that: effective grout length test structure of stock installation includes the country rock, bore in the country rock and get the drilling of the different degree of depth, arrange the stock in the drilling, the organic glass sleeve pipe is established to the one end cover of stock in the drilling, the stock that organic glass sheathed tube length difference compares in order to form different defects, the sheathed tube internal diameter of organic glass is unanimous with the external diameter size of stock, grout between drilling and stock, the organic glass sleeve pipe.
When adopting above-mentioned technical scheme, the utility model discloses can also adopt or make up and adopt following technical scheme:
as the utility model discloses a preferred technical scheme: the length of the anchor rod is 2-4 m, and the diameter is 20-30 mm.
As the utility model discloses a preferred technical scheme: the defect ratio of the anchor rod is 0 or 25% or 50% or 75%.
The utility model discloses it is still another aim at, to the not enough of existence among the prior art, provide an effective grout length test system of stock installation.
To this end, the above object of the present invention is achieved by the following technical solutions:
the utility model provides an effective grout length test system of stock installation which characterized in that: effective grout length test system of stock installation includes preceding the effective grout length test structure of stock installation, still include that the country rock is equipped with digital signal acquisition appearance, signal amplifier, signal transmitter and arrange the sound wave transmitting transducer and the sound wave receiving transducer at the stock both ends, sound wave transmitting transducer sets up the one end that is in the drilling at the stock, sound wave receiving transducer sets up the one end that is in the drilling outside the stock, sound wave transmitting transducer is connected with signal transmitter through the transmission cable, signal transmitter is connected with digital signal acquisition appearance, sound wave receiving transducer is connected with signal amplifier through the transmission cable, signal amplifier is connected with digital signal acquisition appearance.
The utility model provides an effective grout length test structure of stock installation and system can realize the test of the effective grout length of stock effectively, conveniently, fast, harmless and quantitatively, need not to carry out destructive test and expensive coring test to the stock, provide effective means for geotechnical engineering's the quality evaluation of strutting.
Drawings
Figure 1 is the illustration of the effective grout length test system of the anchor rod installation provided by the present invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The anchor rod installation effective grouting length testing system comprises an anchor rod installation effective grouting length testing structure, and further comprises a digital signal acquisition instrument 210, a signal amplifier 240, a signal transmitter 230, a sound wave transmitting sensor 221 and a sound wave receiving sensor 222 which are arranged at two ends of the anchor rod 110 and are arranged outside a surrounding rock 100, wherein the sound wave transmitting sensor 221 is arranged at one end of the anchor rod 110, which is positioned in a drill hole 101, the sound wave receiving sensor 222 is arranged at one end of the anchor rod 110, which is positioned outside the drill hole 101, the sound wave transmitting sensor 221 is connected with the signal transmitter 230 through a transmission cable 250 to transmit a sound wave signal, the signal transmitter 230 is connected with the digital signal acquisition instrument 210, the sound wave receiving sensor 222 is connected with the signal amplifier 240 through the transmission cable 250 to receive the sound wave signal, and the signal amplifier 240 is connected with the digital.
Effective grout length test structure of stock installation includes country rock 100, drills the drilling 101 of getting the different degree of depth in the country rock 100, arranges stock 110 in the drilling 101, and organic glass sleeve pipe 120 is established to the one end cover of stock 110 in drilling 101, and organic glass sleeve pipe 120's length is different in order to form the stock of different defect ratios, and organic glass sleeve pipe 120's internal diameter is unanimous with stock 110's external diameter size. The organic glass sleeve is used for wrapping the end head of the anchor rod and part of the rod body, the organic glass sleeve is prevented from being covered by grouting liquid so as to simulate non-grouting parts corresponding to different defect ratios, and the rest part of the rod body of the anchor rod is covered by grouting liquid. Grouting is performed between the drill hole 101 and the anchor rod 110 and the plexiglas sleeve 120. Wherein the defect ratio is defined as the ratio of the effective grouting length to the total length of the anchor rod, the anchor rods with different defect ratios can be prepared according to actual requirements, and the suggested defect ratios can be set to be 0 percent, 25 percent, 50 percent and 75 percent.
The length of the anchor rod 110 is 2-4 m, and the diameter is 20-30 mm, in this embodiment, the length of the anchor rod 110 can be 3 m, and the diameter can be 26 mm.
And testing the anchor rods installed with different defect ratios on site, and recording the corresponding sound wave speed and transmission time, namely judging the effective grouting length of the anchor rods by using the obtained sound wave transmission time and wave speed in the subsequent on-site anchor rod grouting length detection.
The above-mentioned embodiments are only for explaining the preferred embodiments of the present invention, and not for limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made by the present invention fall within the protection scope of the present invention within the spirit and the protection scope of the claims.
Claims (4)
1. The utility model provides an effective grout length test structure of stock installation which characterized in that: effective grout length test structure of stock installation includes the country rock, bore in the country rock and get the drilling of the different degree of depth, arrange the stock in the drilling, the organic glass sleeve pipe is established to the one end cover of stock in the drilling, the stock that organic glass sheathed tube length difference compares in order to form different defects, the sheathed tube internal diameter of organic glass is unanimous with the external diameter size of stock, grout between drilling and stock, the organic glass sleeve pipe.
2. The anchor rod installation effective grouting length test structure of claim 1, wherein: the length of the anchor rod is 2-4 m, and the diameter is 20-30 mm.
3. The anchor rod installation effective grouting length test structure of claim 1, wherein: the defect ratio of the anchor rod is 0 or 25% or 50% or 75%.
4. The utility model provides an effective grout length test system of stock installation which characterized in that: the anchor rod installation effective grouting length test system comprises the anchor rod installation effective grouting length test structure as claimed in any one of claims 1 to 3, and further comprises a digital signal acquisition instrument, a signal amplifier, a signal emitter, and a sound wave emission sensor and a sound wave receiving sensor which are arranged outside the surrounding rock, wherein the sound wave emission sensor and the sound wave receiving sensor are arranged at two ends of the anchor rod, the sound wave emission sensor is arranged at one end of the anchor rod, which is positioned in a drilled hole, the sound wave receiving sensor is arranged at one end of the anchor rod, which is positioned outside the drilled hole, the sound wave emission sensor is connected with the signal emitter through a transmission cable, the signal emitter is connected with the digital signal acquisition instrument, the sound wave receiving sensor is connected with the signal amplifier through the transmission cable, and.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020031049.4U CN211477049U (en) | 2020-01-08 | 2020-01-08 | Effective grouting length test structure and system for anchor rod installation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020031049.4U CN211477049U (en) | 2020-01-08 | 2020-01-08 | Effective grouting length test structure and system for anchor rod installation |
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| Publication Number | Publication Date |
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| CN211477049U true CN211477049U (en) | 2020-09-11 |
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| CN202020031049.4U Active CN211477049U (en) | 2020-01-08 | 2020-01-08 | Effective grouting length test structure and system for anchor rod installation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640352A (en) * | 2021-07-30 | 2021-11-12 | 中铁二十五局集团第四工程有限公司 | On-site monitoring system and testing method for fracture state of anchor rod in surrounding rock |
-
2020
- 2020-01-08 CN CN202020031049.4U patent/CN211477049U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640352A (en) * | 2021-07-30 | 2021-11-12 | 中铁二十五局集团第四工程有限公司 | On-site monitoring system and testing method for fracture state of anchor rod in surrounding rock |
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