CN107677400B

CN107677400B - Installation positioner of country rock pressure cell

Info

Publication number: CN107677400B
Application number: CN201710895530.0A
Authority: CN
Inventors: 高文学; 王林台; 邓洪亮; 石连松; 曹晓立; 叶阗瑞
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2017-09-28
Filing date: 2017-09-28
Publication date: 2020-01-24
Anticipated expiration: 2037-09-28
Also published as: CN107677400A

Abstract

The utility model provides an installation positioner of country rock pressure cell, belongs to engineering monitoring or experimental measurement technical field. Comprises an upper sandbox and a lower spring support. The upper sandbox comprises a hard plastic bucket and a plastic bag; the hard plastic barrel is horn-shaped, and has a large opening at one end and a small opening at the other end; the mouth of the plastic bag is attached and stuck with the small mouth end of the hard plastic barrel; the lower spring support comprises a fixed plate and a spring piece; the fixed plate is in a circular ring plate-shaped structure, and pressure box placing grooves are respectively formed in the central circular ring hole along two ends of the diameter of the circular ring; a plurality of bolt seats with bolt holes are arranged in the radial direction of the outer side of the circular plate-shaped structure of the fixing plate; the fixed plate surface is provided with a plurality of pressure box lock catches, the small opening end of the hard plastic barrel is fixed with the fixed plate surface, and the pressure box lock catches are positioned in the hard plastic barrel; the other end of the spring piece is a U-shaped clamping piece. The problems of large installation workload, inaccurate positioning, unreasonable stress and later-stage construction influence in the use process of the tunnel primary lining surrounding rock pressure cell are solved.

Description

Installation positioner of country rock pressure cell

Technical Field

The invention relates to an installation positioning device for a tunnel surrounding rock pressure box, and belongs to the technical field of engineering monitoring or experimental measurement.

Background

The pressure cell has been commonly used in tunnel engineering surrounding rock pressure and the compressive stress measurement of the rock-soil body in the experiment now, and when current tunnel surrounding rock pressure cell was installed, the back of rock body pickaxe was flat earlier, or looked for relatively flat position, with the pressure cell stress face towards this position, still need place the sand of certain thickness between pressure cell and rock body to guarantee that the atress is even. The pressure cell then needs to be secured on the back to an arch or the like. Because no special installation positioning device is arranged, the workload of the site is large, the installation error is large, the position is inaccurate, and the stress is unreasonable because the sand bed cannot be placed. In addition, the pressure box is easily influenced in the process of primary lining rear grouting. The monitoring of the surrounding rock pressure cannot truly reflect the engineering situation due to the above reasons. Therefore, it is necessary to design a special installation positioning device.

Disclosure of Invention

The invention discloses an installation positioning device for a tunnel surrounding rock pressure box, which aims to solve the problems of large installation workload, inaccurate positioning, unreasonable stress and influence of later construction in the use process of the tunnel primary lining surrounding rock pressure box.

The technical scheme adopted by the invention is that the mounting and positioning device for the surrounding rock pressure box comprises an upper sandbox and a lower spring support. The upper sandbox comprises a hard plastic bucket (1) and a plastic bag (2); the hard plastic barrel (1) is horn-shaped, and has a large opening at one end and a small opening at the other end; the opening of the plastic bag (2) is attached and stuck with the small opening end of the hard plastic barrel (1);

the lower spring support comprises a fixed plate (3) and a spring piece (4); the fixing plate (3) is of a circular ring plate-shaped structure, and pressure box placing grooves (6) are respectively formed in the central circular ring hole along two ends of the diameter of the circular ring; a plurality of bolt seats (8) with bolt holes are arranged on the outer side of the annular plate-shaped structure of the fixing plate (3) in the radial direction; a plurality of pressure box lock catches (7) are arranged on the plate surface of the circular plate-shaped structure of the fixing plate (3), the small opening end of the hard plastic barrel (1) is fixed with the plate surface of the circular plate-shaped structure of the fixing plate (3), and the pressure box lock catches (7) are positioned in the hard plastic barrel (1); a bolt hole is formed in one end of each spring piece (4), the bolt hole of each spring piece (4) is fixedly connected with the bolt hole of each bolt seat (8) through a bolt (9), a U-shaped clamping piece (10) is arranged at the other end of each spring piece (4), and each bolt seat (8) corresponds to one spring piece (4); the spring pieces (4) and the hard plastic barrel (1) are respectively positioned on two sides of the fixing plate (3); the U-shaped clamping pieces of the spring pieces (4) can be fixed on the arch frame.

The side wall of the hard plastic barrel (1) is provided with a lead hole (5).

The diameter of the central circular ring hole of the fixing plate (3) is smaller than that of the pressure box; the distance between the two pressure boxes arranged in the radial top of the groove (6) is larger than the diameter of the pressure box.

The pressure box lock catch is of an L-shaped structure.

Firstly, preliminarily determining the sand using amount according to the distance between an arch frame and surrounding rocks, pouring fine sand into a plastic bag (2) from a central circular hole of a circular plate structure of a fixed plate, vertically placing a pressure box into a groove (6) from the pressure box, and then rotating the pressure box to enable the pressure box to be placed into a hard plastic barrel (1) and simultaneously be supported and fixed by a pressure box lock catch (7); the lead of the pressure cell is led out from the lead hole (5); then, according to the distance between the arch centering and the surrounding rock, the height of the spring piece (4) is adjusted, the spring piece (4) is rotated along the surrounding bolt (9) to adapt to the arch centering, and the U-shaped clamping piece (10) is fixed with the arch centering; and (3) supporting the plastic bag (2) filled with fine sand in the upper sandbox on the surrounding rock, and finally fixing the lead, confirming the position and recording.

The fixing bolts (9) and the U-shaped clamping pieces (10) at the two ends of the spring piece (4) can adapt to the widths of different arches through rotation, and the clamping pieces can be clamped on a steel bar and an I-shaped steel. The spring piece has plasticity simultaneously, can adjust the support height.

The hard plastic barrel (1) plays a role in supporting the plastic bag (2) filled with fine sand, the inner surface of the hard plastic barrel (1) is smooth, the outer surface of the hard plastic barrel is provided with notches, the notches are arranged from a large port to a small port from dense to sparse, and the wall thickness of the notches is also from thin to thick. Therefore, the large port at the upper part can be torn and broken along the notch groove under the pressure of surrounding rocks, and the lower part can also ensure higher deformation under the surrounding acting force without influencing the natural stress of the pressure box.

The small port at the lower part of the hard plastic barrel (1) is thicker, the notch is more sparse, and the integrity can be ensured although the notch is deformed. Therefore, the pressure box can be effectively protected from being eroded by mortar or moisture in the subsequent back grouting process of the tunnel, so that the sand layer can be prevented from being solidified and hardened, and the accuracy of subsequent measurement is ensured.

Although the plastic bag (2) can bear the weight of sand temporarily, the plastic bag (2) has lower strength and can be damaged by larger pressure, so that the deformation of the sand cannot be influenced under the later-stage surrounding rock pressure, and the pressure box is guaranteed to be stressed reasonably and accurately.

The spring leaf (4) of the lower support plays a role in temporarily fixing the whole body, and after the installation is finished, the primary lining guniting can enable the bottom plate 3 and the arch center to be fixedly connected together to realize final fixing.

The plastic bag (2) is made of polyethylene plastic bag, and is adhered to the inner wall of the hard plastic barrel (1) at the position close to the small opening end of the bottom of the hard plastic barrel (1), the hard plastic barrel (1) and the fixing plate (3) are integrated, and the materials are all hard plastics.

Drawings

Fig. 1 is a perspective view of the overall structure.

Fig. 2 is a side view.

Fig. 3 is a perspective view of the fixing plate.

FIG. 4 is a solid cross-sectional view of a rigid plastic bucket

Fig. 5 is a cross-sectional view of a rigid plastic bucket.

Fig. 6 is a perspective view of a spring plate.

The device comprises a hard plastic barrel 1, a polyethylene plastic bag 2, a fixing plate 3, a spring leaf 4, a lead hole 5, a pressure box placing groove 6, a pressure box lock catch 7, a bolt seat 8, a fixing bolt 9 and a U-shaped clamping piece 10.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings, which are schematic drawings and illustrate only the basic structure of the present invention in a schematic manner, but the present invention is not limited to the following embodiments.

Example 1

Fig. 1 to 6 show the basic construction of the present invention, the rigid plastic bucket 1 mainly functions to support the plastic bag 2 and also functions to insulate mortar in post-grouting. The plastic barrel 1 is provided with the notches, the notches are net-shaped, so that when the plastic barrel is subjected to surrounding rock pressure, the barrel wall at the thinner upper part can be broken and crushed, and the lower part can be guaranteed to be deformed greatly but cannot be crushed.

The fine sand is put into from the centre bore of fixed plate 3, and the pressure cell is put into from the groove 6 of putting into that the fixed plate was reserved to the upset is fixed with pressure cell hasp 7 (the pressure cell hasp is L type structure, and all L type structure one end vertical fixation are to fixed plate 3, and the inward dispersion of the other end forms a plane), also plays the effect of plugging up the sand bag.

The lower spring piece 4 has plasticity, and the height can be adjusted according to the distance between the arch frame and the surrounding rock so as to ensure that the sand bucket props against the surrounding rock. The position of the fixing is adjusted by rotating the bolt 9 to adapt to the arch shape.

Claims

1. The mounting and positioning device for the surrounding rock pressure box is characterized by comprising an upper sandbox and a lower spring support; the upper sandbox comprises a hard plastic bucket (1) and a plastic bag (2); the hard plastic barrel (1) is horn-shaped, and has a large opening at one end and a small opening at the other end; the opening of the plastic bag (2) is attached and stuck with the small opening end of the hard plastic barrel (1);

the lower spring support comprises a fixed plate (3) and a spring piece (4); the fixing plate (3) is of a circular ring plate-shaped structure, and pressure box placing grooves (6) are respectively formed in the central circular ring hole along two ends of the diameter of the circular ring; a plurality of bolt seats (8) with bolt holes are arranged on the outer side of the annular plate-shaped structure of the fixing plate (3) in the radial direction; a plurality of pressure box lock catches (7) are arranged on the plate surface of the circular plate-shaped structure of the fixing plate (3), the small opening end of the hard plastic barrel (1) is fixed with the plate surface of the circular plate-shaped structure of the fixing plate (3), and the pressure box lock catches (7) are positioned in the hard plastic barrel (1); a bolt hole is formed in one end of each spring piece (4), the bolt hole of each spring piece (4) is fixedly connected with the bolt hole of each bolt seat (8) through a bolt (9), a U-shaped clamping piece (10) is arranged at the other end of each spring piece (4), and each bolt seat (8) corresponds to one spring piece (4); the spring pieces (4) and the hard plastic barrel (1) are respectively positioned on two sides of the fixing plate (3); the U-shaped clamping pieces of the spring pieces (4) can be fixed on the arch frame; a lead hole (5) is formed on the side wall of the hard plastic barrel (1);

the diameter of the central circular ring hole of the fixing plate (3) is smaller than that of the pressure box; the distance between the two pressure boxes placed in the radial top of the groove (6) is greater than the diameter of the pressure boxes; the pressure box lock catch is of an L-shaped structure.

2. A mounting and positioning device for a surrounding rock pressure cell as claimed in claim 1, wherein the rigid plastic barrel (1) is used for supporting the plastic bag (2) filled with fine sand, the inner surface of the rigid plastic barrel (1) is smooth, the outer surface of the rigid plastic barrel is provided with the notches, the notches are arranged from a large port to a small port and are from dense to sparse, and the wall thickness of the notches is from thin to thick.

3. A method implemented using the installation positioning device of claim 1, comprising the steps of: firstly, preliminarily determining the sand using amount according to the distance between an arch frame and surrounding rocks, pouring fine sand into a plastic bag (2) from a central circular hole of a circular plate structure of a fixed plate, vertically placing a pressure box into a groove (6) from the pressure box, and then rotating the pressure box to enable the pressure box to be placed in a hard plastic barrel (1) and be supported and fixed by a pressure box lock catch (7); the lead of the pressure cell is led out from the lead hole (5); then, according to the distance between the arch centering and the surrounding rock, the height of the spring piece (4) is adjusted, the spring piece (4) is rotated along the surrounding bolt (9) to adapt to the arch centering, and the U-shaped clamping piece (10) is fixed with the arch centering; and (3) supporting the plastic bag (2) filled with fine sand in the upper sandbox on the surrounding rock, and finally fixing the lead, confirming the position and recording.