CN214333718U

CN214333718U - Displacement sensor mounting structure suitable for high rockfill embankment side slope

Info

Publication number: CN214333718U
Application number: CN202120739895.6U
Authority: CN
Inventors: 郜梦棵; 李盛; 田文迪; 钟少杰; 刘玉龙; 梁满坤
Original assignee: Changsha University of Science and Technology; No 2 Engineering Co of CCCC Fourth Harbor Engineering Co Ltd
Current assignee: Changsha University of Science and Technology; No 2 Engineering Co of CCCC Fourth Harbor Engineering Co Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2021-10-01
Anticipated expiration: 2031-04-12

Abstract

The utility model discloses a displacement sensor mounting structure suitable for a high-fill stone embankment side slope, which comprises an elastic sheath and a backfill body; the elastic sheath is vertically inserted into a buried hole drilled at the joint of the road shoulder and the side slope, the backfill body is embedded at the joint of the road shoulder and the side slope, and the elastic sheath penetrates through the backfill body; the inner cavity of the elastic sheath is used for placing a displacement sensor, so that the top ends of the displacement sensor and the elastic sheath are higher than the buried hole and are embedded in the backfill body. The construction platform is built by cutting the grooves, and the buried holes are drilled in the construction platform, so that the drilling construction difficulty is reduced, and the buried hole precision is improved. The displacement sensor is protected to the elasticity sheath, reduces embankment filler or backfill body direct contact displacement sensor and causes the too big and damaged risk of local stress. Meanwhile, the problem that the displacement sensor is extruded and damaged by the embankment filler and the initial numerical value error is caused by lateral extrusion of the displacement sensor in pre-buried construction can be solved.

Description

Displacement sensor mounting structure suitable for high rockfill embankment side slope

Technical Field

The utility model belongs to the road engineering field especially relates to a displacement sensor mounting structure suitable for high rockfill embankment side slope.

Background

The high-rockfill embankment is a common structural form in the process of building the highway in the mountainous area, and due to the fact that the geological condition of a mountain body in an engineering range is complex, geological survey data cannot completely reveal the engineering geological condition of the site, and in order to ensure the safety of the side slope of the high-rockfill embankment, a side slope monitoring system is often established during construction, so that the purposes of information-based construction and dynamic design are achieved.

The side slope monitoring system mainly comprises monitoring of horizontal displacement and vertical displacement of the side slope, two methods are mainly used for installing the displacement sensor at present, one method is to directly adopt a drilling machine to drill holes at the side slope after the whole construction of the embankment is finished, and then install the displacement sensor, because the filling particles at the side slope of the stone-filled embankment are large, the direct drilling easily causes slip and further influences the whole stability of the side slope of the embankment, and the direct drilling construction difficulty is large; the other method is to pre-embed along with the construction process of the embankment and then carry out embankment construction, protect the pre-embedded displacement sensor in the construction process, and the method easily causes the mounting position of the displacement sensor in the embankment compaction construction process to be deviated and even damaged, thereby influencing data collection.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a displacement sensor mounting structure suitable for high rockfill embankment side slope, the embankment is filled and is finished the back and drill hole underground displacement sensor again, reduces the construction degree of difficulty, avoids displacement sensor to be destroyed by extrusion skew even.

The utility model discloses a realize through following technical scheme:

a displacement sensor mounting structure suitable for a high-rockfill embankment side slope comprises an elastic sheath and a backfill body; the elastic sheath is vertically inserted into a buried hole drilled at the joint of the road shoulder and the side slope, the backfill body is embedded at the joint of the road shoulder and the side slope, and the elastic sheath penetrates through the backfill body; the inner cavity of the elastic sheath is used for placing a displacement sensor, so that the top ends of the displacement sensor and the elastic sheath are higher than the buried hole and are embedded in the backfill body.

By the proposal, the utility model discloses at least, obtain following technological effect:

a horizontal construction station is dug at the joint of the road shoulder and the side slope, a vertical downward buried hole is drilled at the construction station, and the difficulty of drilling construction is reduced. And inserting the displacement sensor into the elastic sheath, then inserting the elastic sheath into the buried hole, and keeping the top end part of the elastic sheath wrapping the displacement sensor higher than the buried hole. And finally, filling the backfill body into the construction position to fill the embankment shape, and embedding the elastic sheath wrapped with the displacement sensor into the backfill body.

When the embankment displaces, the backfill body is pushed, and the backfill body pushes the displacement sensor in the elastic sheath to measure data. The elastic sheath can be used as a force transmission medium to enable the displacement sensor to measure data after being stressed, and can provide necessary protection for the displacement sensor, so that the damage probability of the displacement sensor is reduced.

Preferably, the elastic sheath is composed of an inner hose and a filling layer; the inner hose is inserted into the buried hole, the filling layer is arranged between the inner hose and the inner wall of the buried hole, and the inner cavity of the inner hose is used for arranging a displacement sensor.

Preferably, the elastic sheath further comprises an outer hose; the outer hose is connected to the top end of the inner hose.

Preferably, the inner hose is a PVC rubber pipe, and the outer hose is a reinforced threaded hose.

Preferably, the filling layer is a fine sand layer.

The utility model has the advantages that:

the utility model discloses a construction platform is established to the mode of cutting the recess to bore at construction platform and establish the buried via, reduce the drilling construction degree of difficulty, promote the buried via precision. And then the displacement sensor is arranged in the elastic sheath to be embedded, so that the elastic sheath and the displacement sensor inside the elastic sheath can be kept in a numerical state during initial installation, and the lateral direction is not extruded. The displacement sensor is protected to the elasticity sheath, reduces embankment filler or backfill body direct contact displacement sensor and causes the too big and damaged risk of local stress. Meanwhile, the problem that the displacement sensor is extruded and damaged by the embankment filler and the initial numerical value error is caused by lateral extrusion of the displacement sensor in pre-buried construction can be solved.

Drawings

Fig. 1 is a schematic view of an installation state of a displacement sensor suitable for a high rockfill embankment slope according to an embodiment of the present invention.

Legend:

1, an elastic sheath; 2, backfilling the body; 3, shoulder of road; 4, slope; 5, burying a hole; 6 a displacement sensor; 7, grooves; 8, an embankment;

11 an inner hose; 12 a filling layer; 13 outer hose.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1:

in this embodiment, the applicable high-fill embankment side slope 4 is a secondary side slope structure. The slope rate of the first-stage side slope is 1:1.75, and the slope rate of the second-stage side slope is 1: 1.5. A groove 7 with a horizontal bottom surface is formed in the top of the second-stage side slope, namely the joint of the side slope 4 and the road shoulder 3, and a buried hole 5 is drilled in the bottom surface of the groove 7. Aiming at the high-rockfill embankment side slope 4, the displacement sensor mounting structure suitable for the high-rockfill embankment side slope is provided and comprises an elastic sheath 1 and a backfill body 2. The displacement sensor 6 is plugged into the elastic sheath 1, then the elastic sheath 1 is inserted into the buried hole 5, the top end of the elastic sheath 1 is kept higher than the buried hole 5, and the displacement sensor 6 in the elastic sheath 1 is also kept higher than the buried hole 5. And the backfill body 2 is filled in the groove 7 and wraps the periphery of the elastic sheath 1. When the embankment 8 deflects, the backfill body 2 is extruded on the elastic sheath 1 along with the movement of the embankment 8, the elastic sheath 1 generates elastic deformation, and acting force is applied to the displacement sensor 6 to measure data.

The elastic sheath 1 is composed of an inner hose 11, an outer hose 13 and a filling layer 12. The inner hose 11 is a PVC rubber pipe, the outer hose 13 is a reinforced threaded hose, and the filling layer 12 is a fine sand layer. During construction, the displacement sensor 6 is placed in the PVC rubber pipe and integrally inserted into the buried hole 5, and then fine sand is poured between the PVC rubber pipe and the inner wall of the buried hole 5 to form a filling layer 12 so as to ensure the vertical state of the displacement sensor 6. Not only can effectively transmit the compression effect generated by the displacement of the embankment 8, but also can diffuse the stress area, weaken the local stress on the displacement sensor 6 and reduce the risk of damage to the displacement sensor 6. Moreover, the outer hose 13 can also protect the external cable of the displacement sensor 6.

Example 2:

in the present embodiment, on the basis of embodiment 1, there is provided a method for installing a displacement sensor 6 suitable for a high-fill embankment side slope 4, and the following steps are implemented:

the method comprises the following steps: a groove 7 with a horizontal bottom surface is drilled at the joint of the road shoulder 3 and the side slope 4, the depth of the groove 7 is 80-120cm, the width along the traffic direction is 100-plus-150 cm, the length along the direction of the embankment 8 is 100-plus-150 cm, and a vertical buried hole 5 with the diameter of 10-12cm and the depth of 600-plus-900 cm is drilled at the bottom of the groove 7.

Step two: a PVC rubber pipe is used as an inner hose 11 to be inserted into the buried hole 5, and fine sand is filled between the PVC rubber pipe and the buried hole 5 to form a filling layer 12. The displacement sensor 6 is prevented from being damaged by local stress concentration caused by shaking or extrusion due to external vibration. And then the reinforced threaded hose is taken as an outer hose 13 to be connected to the top end of the PVC pipe, and an external cable of the displacement sensor 6 penetrates out of the outer hose. Can protect the external cable from falling rocks and rain erosion.

Step three: the displacement sensor 6 is arranged in the inner hose 11, and the top ends of the displacement sensor 6 and the inner hose 11 are higher than the buried hole by 540-50 cm.

Step four: the backfill body 2 is backfilled in the groove 7, wrapped around the inner hose 11 and tamped.

Example 3:

in the embodiment, on the basis of the embodiment 2, the construction method is further optimized by combining the construction environment of the high-rockfill embankment.

The backfill body 2 is formed by filling gravel particles. When the particle size of the crushed stone particles is too large, effective compaction cannot be performed after filling, and collapse is easily generated in the subsequent use process. When the particle size of the crushed stone particles is too small, the crushed stone particles of the backfill body 2 can leak from a lower gap and easily run off after being washed by rainwater, so that the problem of instability of the embankment side slope 4 is caused.

In order to avoid the influence of the particle size or the proportion of the crushed stone particles on the overall structural strength of the embankment 8, in an embodiment, the maximum particle size of the crushed stone particles of the backfill body 2 should be less than or equal to 400mm, the minimum particle size should be greater than or equal to 150mm, and the proportion of the crushed stone with the particle size within the range of 200-400mm is not less than 60%.

It is worth mentioning that when the crushed stone particles of the backfill body 2 are screened, besides the particle size, the crushed stone particles also have the characteristics of clean surface, strong weather resistance, hard texture, density of more than or equal to 2.4t/m3 and the like, so as to avoid the influence on the stability of the side slope 4 and the overall strength of the embankment 8 due to poor quality of the crushed stone.

When the broken stone particles of the backfill body 2 are paved, the broken stone particles are uniformly paved according to the thickness of each layer of 30-50cm, and a tamping machine is adopted for compaction treatment, so that the integrity of the backfill body 2, the embankment 8 and the side slope 4 is ensured to be intact.

Various technical features in the above embodiments may be arbitrarily combined as long as there is no conflict or contradiction in the combination between the features, but is limited to the space and is not described one by one.

The present invention is not limited to the above embodiment, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology if they do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides a displacement sensor mounting structure suitable for high rockfill embankment side slope which characterized in that: comprises an elastic sheath and a backfill body; the elastic sheath is vertically inserted into a buried hole drilled at the joint of the road shoulder and the side slope, the backfill body is embedded at the joint of the road shoulder and the side slope, and the elastic sheath penetrates through the backfill body; the inner cavity of the elastic sheath is used for placing a displacement sensor, so that the top ends of the displacement sensor and the elastic sheath are higher than the buried hole and are embedded in the backfill body.

2. The displacement sensor mounting structure for a high-fill stone embankment side slope according to claim 1, wherein the elastic sheath is composed of an inner hose and a filling layer; the inner hose is inserted into the buried hole, the filling layer is arranged between the inner hose and the inner wall of the buried hole, and the inner cavity of the inner hose is used for arranging a displacement sensor.

3. The displacement sensor mounting structure for a high-fill stone embankment slope according to claim 2, wherein the elastic sheath further comprises an outer hose; the outer hose is connected to the top end of the inner hose.

4. The structure of claim 3, wherein the inner hose is a PVC rubber hose, and the outer hose is a ribbed threaded hose.

5. The displacement sensor installation structure suitable for high-fill stone embankment side slopes according to claim 2, wherein the filling layer is a fine sand layer.