Tunnel surrounding rock monitoring and supporting structure

Abstract

The utility model discloses a tunnel surrounding rock monitoring and supporting structure which comprises a steel arch frame, a support strip is arranged on the inner side of the steel arch frame, a support frame is arranged on the outer wall of the support strip, a connecting piece is arranged on the outer wall of the support frame, a retractable assembly is arranged in the connecting piece, a spring is arranged at the top end of the retractable assembly, and the retractable assembly is connected with the steel arch frame. A limiting block is arranged on the outer wall of the spring, a bearing box is arranged at the top end of the limiting block, and a soil pressure measuring instrument is arranged at the top end of the bearing box. At present, the steel arches can be firstly installed and then fixedly connected through the support strips, so that a lot of measurement work is reduced for construction engineers, and meanwhile, a lot of construction time is saved for construction workers.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel surrounding rock monitoring, in particular to a tunnel surrounding rock monitoring support structure. Background Art

[0002] Support is a measure of support, reinforcement and protection for the side walls and surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. In recent years, due to the rapid development of urban subway projects, subway stations and local open excavation have also involved a large amount of foundation pit projects. In subway stations with double-track intersections, the foundation pit is as deep as 20-30m. Water conservancy and power also have problems with foundation pit excavation for underground powerhouses and underground pump rooms. Whether it is a high-rise building or a deep foundation pit project for a subway, since they are all excavated in the city, there are usually various structures such as traffic arteries, existing buildings or pipelines around the foundation pit. This involves a very important aspect of foundation pit excavation, which is to protect the safe use of surrounding structures. Generally, foundation pit supports are temporary structures, which require large investments and are prone to waste. However, unsafe support structures are bound to cause engineering accidents. Therefore, how to safely and reasonably select appropriate support structures and scientifically design them according to the characteristics of foundation pit projects is the main issue to be solved in foundation pit projects. Reinforced concrete sheet piles have the characteristics of simple construction and short on-site operation cycle. They have been widely used in foundation pits. However, since reinforced concrete sheet piles are generally driven by hammering, vibration and noise, and soil extrusion during pile sinking is also relatively serious, they are subject to certain restrictions in urban projects.

[0003] Because the current reinforced concrete support and steel frame support cannot monitor and detect the pressure of the surrounding rock in real time after installation, this causes a lot of time waste for construction workers. At the same time, the installation of existing supports requires precise measurement of the spacing before they can be fixed and installed, which brings great trouble to engineers and construction workers. Utility Model Content

[0004] The purpose of the utility model is to provide a tunnel surrounding rock monitoring support structure to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tunnel surrounding rock monitoring support structure, comprising a steel arch frame, a support bar is provided on the inner side of the steel arch frame, a support frame is provided on the outer wall of the support bar, a connecting piece is provided on the outer wall of the support frame, a retractable assembly is provided inside the connecting piece, a spring is provided at the top of the retractable assembly, a limit block is provided on the outer wall of the spring, a carrying box is provided on the top of the limit block, and an earth pressure measuring instrument is provided on the top of the carrying box.

[0006] Preferably, a plurality of screw holes are provided on the top of the steel arch.

[0007] Preferably, the top end of the bracket bar and the top end of the bracket frame are provided with a plurality of screw holes for use with each other, and the bracket bar can slide inside the bracket frame.

[0008] Preferably, a plurality of screw holes are provided on both the left and right sides of the connecting member, and a ratchet is provided inside the connecting member.

[0009] Preferably, the retractable assembly includes an adjusting support member, which is arranged at the top of the ratchet inside the connecting member, a straight rod is provided on the inner side of the adjusting support member, a pulley is provided on the side of the straight rod away from the adjusting support member, a triangular block is provided on the side of the pulley away from the straight rod, and a sliding member is provided on the top of the triangular block.

[0010] Preferably, the diameter of the sliding member is consistent with the inner diameter of the limiting block, and the sliding member is slidably connected to the limiting block.

[0011] Preferably, both left and right sides of the inner wall of the carrying box are provided with limiting protrusions for limiting the sliding direction of the adjustment support member.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] Easy to install: Due to the provision of adjustable length bracket strips, it is no longer necessary to measure the precise spacing between two adjacent steel arch frames before they can be connected using the bracket strips. Now we can install the steel arch frames first and then use the bracket strips for fixed connection. This reduces a lot of measurement work for construction engineers and also saves a lot of construction time for construction workers.

[0014] Real-time detection of surrounding rock pressure: The earth pressure measuring instrument is set on the support surface. Without affecting the support force, the external surrounding rock pressure can be monitored and detected in real time. It enables surveying workers to measure the qualified layer of surrounding rock better, faster and more conveniently for later tunnel construction.

[0015] No excessive requirements on the applicable environment: Due to the provision of a sliding earth pressure measuring instrument, it is not necessary to measure the distance better than the surrounding rock during the installation of the steel arch frame, or to level the surrounding rock first. The earth pressure measuring instrument can be pushed close to the surrounding rock to the ideal working position and then fixedly installed. The operation is simple and quick, which can ensure that the construction workers can install it conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the three-dimensional connection structure details of the middle part;

[0018] Figure 3 for Figure 2 Schematic diagram of the front section connection structure details;

[0019] Figure 4 for Figure 3 A schematic diagram of the enlarged connection structure details at position A;

[0020] Figure 5 for Figure 1 Schematic diagram of the top view of the connection structure details of the middle support bar and the support frame.

[0021] In the figure: 1. Steel arch frame, 2. Support bar, 3. Support frame, 4. Connecting piece, 5. Adjusting support piece, 6. Straight rod, 7. Pulley, 8. Triangular block, 9. Sliding piece, 10. Spring, 11. Limit block, 12. Carrying box, 13. Soil pressure measuring instrument. DETAILED DESCRIPTION

[0022] See also Figure 1-5 The utility model provides a technical solution: a tunnel surrounding rock monitoring support structure, including a steel arch frame 1 for supporting and protecting the surrounding rock and bearing the main pressure. A support bar 2 is provided on the inner side of the steel arch frame 1 for connecting the two steel arch frames 1 and playing a supporting role between the two steel arch frames. A support frame 3 is provided on the outer wall of the support bar 2, which can make the support bar slide inside the support frame 3 so that the length of the support bar 2 can be adjusted, thereby making the connection of the steel price 1 more convenient. A connecting piece 4 is provided on the outer wall of the support frame 3 for connecting the two support bars 2 to make the support bar 2 stronger. At the same time, an earth pressure measuring instrument is carried inside to detect the pressure changes of the surrounding rock in real time. The connecting piece 4 is internally provided with a retractable component for adjusting the height of the earth pressure measuring instrument, thereby making the earth pressure measuring instrument more close to the surrounding rock and better detecting the surrounding rock pressure in real time.

[0023] A spring 10 is provided at the top of the retracting and extending assembly. When the sliding part 9 slides upward, the spring 10 will generate a downward thrust when subjected to a force and then reset the sliding part 9. A limit block 11 is provided on the outer wall of the spring 10 to limit the sliding direction of the sliding part 9 and the elastic direction of the spring 10. A carrying box 12 is provided at the top of the limit block 11 to load the internal sliding block 5, transmission rod 9, spring 10 and the top soil pressure measuring instrument 13. The top of the carrying box 12 is provided with a soil pressure measuring instrument 13 to measure the pressure of the surrounding rock in real time.

[0024] The top of the steel arch frame 1 is provided with multiple screw holes for fixing the bracket bar 2 by bolts, and the top of the bracket bar 2 and the top of the bracket frame 3 are provided with multiple matching screw holes for fixing the bracket bar 2 and the bracket frame 3 more firmly when the bracket bar 2 is extended, and the bracket bar 2 can slide inside the bracket frame 3 to enable the bracket bar to extend and retract inside the bracket frame 3 to adjust the length of the bracket bar.

[0025] There are multiple screw holes on both sides of the connecting member 4 for fitting with bolts to fix to the outer wall of the bracket frame 3. A ratchet is provided inside the connecting member 4 to allow the adjustment support to slide upward but not downward, thereby ensuring that the earth pressure measuring instrument can work normally.

[0026] The retracting and unfolding assembly includes an adjusting support member 5, which is arranged at the top end of the ratchet inside the connecting member 4 and is used to slide left and right inside the carrying box so that the carrying box can slide upward as a whole and cannot fall downward, thereby ensuring that the soil pressure measuring instrument can work normally. A straight rod 6 is provided on the inner side of the adjusting support member 5 for fixing the connection between the adjusting support member 5 and the pulley 7. A pulley 7 is provided on the side of the straight rod 6 away from the adjusting support member 5 to reduce friction so that the adjusting support member 5 can slide more easily when sliding, and a triangular block 8 is provided on the side of the pulley 7 away from the straight rod 6 for sliding inward on the adjusting support member 5 to receive its force and thus slide upward. The force can be rotated to the spring 10 through the sliding member 9. When the spring pushes the rotating member 9 downward, the triangular block will also slide downward. When the triangular block slides downward, the pulley 7 and the straight rod 6 can be used to push the adjusting support member 5 outward. A sliding member 9 is provided on the top of the triangular block 8 to transmit the force of the bottom triangular block 8 to the top spring. Similarly, the force of the top spring 10 is transmitted to the bottom triangular block 8.

[0027] The sliding member 9 can slide inside the limit block 11 to slide up and down to complete the task of transmitting force. The left and right sides of the inner wall of the carrying box 12 are provided with limit protrusions for limiting the sliding direction of the adjustment support member 5 to adjust the movement trajectory of the support member 5.

[0028] Working principle: When construction workers install the surrounding rock detection support structure, they first install two steel arch frames 1 in the tunnel, and then fix one end of the bracket bar 2 to the steel arch frame 1 on one side with bolts. Then use the bracket frame 3 to adjust the length of the bracket bar 2 until the other end of the bracket bar 2 can be fixedly connected to the second steel arch frame 1. At this time, use bolts to fix the other end of the bracket bar 2 to the steel arch frame 1. After the connection is completed, use bolts to fix the bracket bar 2 and the bracket frame 3 again. Similarly, multiple bracket bars 2 and bracket frames 3 can be connected between the two steel arch frames 1. When the earth pressure measuring instrument 13 needs to be installed, first fix the connecting piece 4 between the two bracket frames 3 with bolts, and then push the supporting box 12 from bottom to top. At this time, adjust the support member 5 in the thrust action. The friction is generated with the ratchet inside the connecting part 4, so that it slides inward. When the adjusting support 5 slides inward, the triangular block 8 will move upward under the transmission of the straight rod 6 and the pulley 7. At this time, the sliding part 9 also moves upward to squeeze the spring 10 at the top. When the spring 10 is squeezed, a downward force is generated. When the adjusting support 5 slides to the next ratchet, it loses the force to slide inward. At this time, due to the pressure of the spring 10, the triangular block 8 moves downward through the transmission of the sliding part 9, and then the pulley 7 and the straight rod 6 are used to push the adjusting support 5 outward. At this time, the adjusting support 5 can be extended and used back and forth in sequence to push the carrying box to the ideal position. Due to gravity, the carrying box as a whole can be fixed, and the soil pressure measuring instrument at the top can work normally.

Claims

1. A tunnel surrounding rock monitoring support structure, comprising a steel arch frame (1), characterized in that: A support bar (2) is provided on the inner side of the steel arch frame (1), a support frame (3) is provided on the outer wall of the support bar (2), a connecting member (4) is provided on the outer wall of the support frame (3), a retractable assembly is provided inside the connecting member (4), a spring (10) is provided on the top end of the retractable assembly, a limit block (11) is provided on the outer wall of the spring (10), a carrying box (12) is provided on the top end of the limit block (11), and an earth pressure measuring instrument (13) is provided on the top end of the carrying box (12).

2. A tunnel surrounding rock monitoring support structure according to claim 1, characterized in that: A plurality of screw holes are provided on the top of the steel arch frame (1).

3. A tunnel surrounding rock monitoring support structure according to claim 2, characterized in that: The top end of the support bar (2) and the top end of the support frame (3) are provided with a plurality of screw holes for use in conjunction with each other, and the support bar (2) can slide inside the support frame (3).

4. A tunnel surrounding rock monitoring support structure according to claim 3, characterized in that: A plurality of screw holes are provided on both the left and right sides of the connecting piece (4), and ratchet teeth are provided inside the connecting piece (4).

5. A tunnel surrounding rock monitoring support structure according to claim 4, characterized in that: The retractable assembly comprises an adjusting support member (5), the adjusting support member (5) being arranged at the top end of the ratchet inside the connecting member (4), a straight rod (6) being arranged on the inner side of the adjusting support member (5), a pulley (7) being arranged on the side of the straight rod (6) away from the adjusting support member (5), a triangular block (8) being arranged on the side of the pulley (7) away from the straight rod (6), and a sliding member (9) being arranged on the top end of the triangular block (8).

6. The tunnel surrounding rock monitoring support structure according to claim 5, characterized in that: The diameter of the sliding member (9) is consistent with the inner diameter of the limiting block (11), and the sliding member (9) is slidably connected to the limiting block (11).

7. The tunnel surrounding rock monitoring support structure according to claim 6, characterized in that: Limiting protrusions for limiting the sliding direction of the adjusting support member (5) are provided on both the left and right sides of the inner wall of the carrying box (12).

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