A suspended follow-up tunnel working area top rockfall protection device

Abstract

The utility model discloses a kind of suspended follow-up tunnel work area top rockfall protection devices, tunnel protection technical field, be set in the top of one side tunnel work area of midseptum, including being set in the tunnel top surface along several groups of suspension anchor rod of tunnel axial direction, suspension anchor rod bottom slidingly arranged T beam;T beam includes transverse wing plate, and the length median line of transverse wing plate is fixedly connected vertical web;Multiple roller supports are fixed in vertical web bottom, the bottom rotationally connected adjusting roller of each roller support, adjusting roller is fixedly connected with protective screen keel;Multiple protective screen keel top surface is flush, protective screen is laid on multiple protective screen keel top surface, and is fixedly connected with protective screen keel top surface.The adjusting roller of being set in the bottom of T beam, protective screen keel, protective screen is set on protective screen keel, so that protective screen can adapt to arch tunnel, suspension anchor rod is set simultaneously, and T beam moves on suspension anchor rod, can make protective screen move along the axial direction of tunnel.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel protection technology, specifically relating to a suspended follow-up type rockfall protection device for the top of the tunnel working area. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Tunnels are often constructed using the center diaphragm method, also known as the CD method. This method involves excavating one side of the tunnel in a long-span tunnel with weak surrounding rock, constructing a center diaphragm in the middle of the design, and then excavating the other side of the tunnel.

[0004] The tunnel top constructed using the diaphragm wall method is also exposed. When the geological structure moves, although the impact on the arch foot is small, the exposed arch top is unsupported and prone to falling rocks, which threaten the work area below and cause great inconvenience to the construction.

[0005] In existing initial support methods, protective nets are usually used to protect the construction site. For example, a patent discloses a method for tunnel rockburst protection using a flexible steel rope net. By fixing the flexible steel rope net inside the tunnel rock surface, rocks can be prevented from falling and serious harm to tunnel construction safety can be avoided.

[0006] However, the above solution is based on one-time protection and cannot be moved. During the tunnel excavation process, each section needs to have a separate protective net installed to protect the work area as the progress progresses. This method not only affects the construction progress but also leads to material waste. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a suspended, follow-up rockfall protection device for the top of the tunnel working area. By installing adjusting rollers and a protective net frame at the bottom of a T-beam, and then installing the protective net on the frame, the protective net can adapt to the varying heights of the arched tunnel top. Simultaneously, suspended anchor rods are installed, and the T-beam moves along these rods, allowing the protective net to move axially along the tunnel. During tunnel excavation, only the suspended anchor rods need to be installed synchronously for each section, eliminating the need for separate protective net installation for each section, thus accelerating construction progress and saving materials.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A suspended follow-up type rockfall protection device for the top of the tunnel working area is installed on the top of the tunnel working area on one side of the middle partition wall. It includes several sets of suspended anchors installed along the tunnel axis on the top surface of the tunnel, and T-shaped beams are slidably installed at the bottom of the suspended anchors. The T-shaped beams include transverse wing plates, and vertical web plates are fixedly connected to the center line of the length of the transverse wing plates.

[0010] Multiple roller brackets are fixed at the bottom of the vertical web plate. Each roller bracket is rotatably connected to an adjusting roller at its bottom, and the adjusting roller is fixedly connected to the protective net keel. The top surfaces of multiple protective net keels are flush, and the protective net is laid on the top surfaces of the multiple protective net keels and fixedly connected to the top surfaces of the protective net keels.

[0011] Preferably, a rotating rod is fixedly connected to the tail of the suspended anchor rod, and a pulley is rotatably connected to the rotating rod; there are two suspended anchor rods in each group, the suspended anchor rods in the same group are arranged opposite each other and the top surfaces of the pulleys are flush, a gap is reserved between the pulleys, and the gap reserved between the pulleys in adjacent groups is the same size.

[0012] Preferably, the transverse wing plate is placed above the pulleys of multiple sets of suspended anchors, and the vertical web plate is placed between two pulleys of the multiple sets of suspended anchors.

[0013] Preferably, the length of the T-beam is at least greater than the spacing between three adjacent sets of suspension anchors; at least two roller supports are fixed at the bottom of the vertical web.

[0014] Preferably, the roller bracket is made of short steel bars welded into a trapezoidal bracket. The two inclined short steel bars of the trapezoidal bracket are welded and fixed to the bottom of the vertical web plate. A straight short steel bar parallel to the vertical web plate is welded between the two inclined short steel bars, and an adjusting roller is rotatably connected to the straight short steel bar.

[0015] Preferably, the adjusting roller is located at the midpoint of the length of the protective netting keel, and the protective netting keel is perpendicular to the vertical web.

[0016] Preferably, the two ends of the protective netting keel should maintain a set distance from the tunnel top surface and should not be in close contact with the tunnel top surface at the same time.

[0017] Preferably, multiple sets of encryption nuts are welded and fixed on the top surface of the protective net, with each set containing no fewer than two encryption nuts; each set of encryption nuts is arranged along the length of the protective net keel.

[0018] Preferably, multiple sets of fixing nuts are provided on the top of the transverse wing plate along the length of the T-beam; each set of fixing nuts includes two nuts, and the fixing nuts in the same set are also provided along the length of the T-beam.

[0019] Preferably, the spacing between the fixing nuts in the same group is equal to the diameter of the suspension anchor plus a set length; when one group of fixing nuts is located on both sides of a certain group of suspension anchors, the fixing nuts of other groups are also located on both sides of the corresponding suspension anchors of other groups.

[0020] Compared with the prior art, the advantages and positive effects of this utility model are:

[0021] This invention features adjustable rollers and a protective net frame at the bottom of a T-beam, with the protective net installed on the frame. This allows the protective net to adapt to the uneven height of the arched tunnel roof. Suspension anchors are also installed, allowing the T-beam to move along the tunnel's axial direction. During tunnel excavation, only the suspension anchors need to be installed synchronously for each section, eliminating the need for separate protective net installation for each section. This accelerates construction and saves materials. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0023] Figure 1 This is a schematic diagram showing the installation location of the rockfall protection device according to an embodiment of this utility model;

[0024] Figure 2 This is a three-dimensional schematic diagram of the rockfall protection device according to an embodiment of the present utility model;

[0025] In the picture:

[0026] 1. Suspension anchor bolt; 2. Pulley; 3. T-beam; 31. Horizontal wing plate; 32. Vertical web plate; 4. Fixing nut; 5. Adjusting roller; 6. Protective net keel; 7. Densification nut; 8. Protective net. Detailed Implementation

[0027] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a suspended, follow-up rockfall protection device for the roof of a tunnel working area, such as... Figure 1 As shown, this device is installed at the top of the working area of ​​the tunnel on one side of the central diaphragm to protect that area. It is understandable that a rockfall protection device would also be installed above the working area when the tunnel on the other side of the central diaphragm is being constructed.

[0029] The tunnel in this embodiment is also constructed using the central diaphragm wall method, such as... Figure 1As shown, since the tunnel is arched overall, when using the diaphragm wall method, the top of one side of the tunnel is a semi-circular arch. Typically, in the tunnel constructed using the diaphragm wall method, the working area is as follows... Figure 1 The area shown is near the bottom of the vault, that is, below the protective device.

[0030] Specifically, such as Figure 2 As shown in Figure 1, a suspended follow-up type tunnel working area top rockfall protection device specifically includes several sets of suspended anchor rods 1 set on the tunnel top on one side of the central partition wall, T-shaped beams 3 are slidably set at the bottom of the several sets of suspended anchor rods 1, and protective nets 8 are fixedly connected to the bottom of the T-shaped beams 3.

[0031] It should be noted that the suspended anchor 1 is installed along the axial direction of the tunnel on one side of the central partition wall. The suspended anchor 1 can be installed simultaneously with the system anchor (support anchor) reinforcement construction during the tunnel excavation support construction. The difference is that the support system anchor is generally a full-length bonded anchor, which is installed as a whole in the borehole; while the length of the suspended anchor 1 is longer than the length of the system anchor, and its tail end will extend out of the borehole.

[0032] Understandably, the installation path of the suspended anchor rod 1 is designed and determined before construction, and the installation must be carried out strictly in accordance with the installation path during construction.

[0033] It is also understandable that the suspended anchor bolt 1 used on the top of the tunnel after construction is completed can still be used as a regular system anchor bolt after the excess length of the anchor bolt is cut off after the support measures are perfected.

[0034] It should also be noted that, in this embodiment, each set of suspended anchor bolts 1 includes two suspended anchor bolts 1. The tops of the two suspended anchor bolts 1, like the system anchor bolts, are drilled into the surrounding rock at the top of the tunnel on one side of the central partition wall. A rotating rod is fixedly connected to the tail of the suspended anchor bolt 1. The rotating rod is perpendicular to the axis of the suspended anchor bolt 1, and a pulley 2 is rotatably connected to the rotating rod. In some embodiments, the pulley 2 can be a ball bearing. The inner ring of the ball bearing is fixedly connected to the rotating rod, and the outer ring of the ball bearing can rotate relative to the rotating rod or the suspended anchor bolt 1.

[0035] In this embodiment, as Figure 1 As shown, each set of suspension anchor rods 1 is arranged opposite to each other, the top surfaces of the pulleys 2 of the two suspension anchor rods 1 are flush, and there is a gap between the pulleys 2. The gap between the pulleys 2 of adjacent sets is the same size.

[0036] like Figure 2 As shown, the T-beam 3 is slidably mounted on multiple sets of suspension anchors 1. Specifically, the T-beam 3 includes a transverse wing plate 31, and a vertical web plate 32 is fixedly connected to the centerline of the transverse wing plate 31 along its length. The vertical web plate 32 is perpendicular to the transverse wing plate 31.

[0037] like Figure 2 As shown, the bottom of the transverse wing plate 31 is placed above the pulleys 2 of multiple sets of suspended anchor rods, and the vertical web plate 32 is positioned between two pulleys of the multiple sets of suspended anchor rods. It should be noted that the gap reserved between the pulleys 2 is greater than the thickness of the vertical web plate 32.

[0038] It should also be emphasized that the length of the T-beam 3 is at least greater than the spacing between the three adjacent sets of suspension anchors 1. This is to ensure that when the T-beam 3 moves relative to several sets of suspension anchors 1, there are at least two sets of suspension anchors 1 supporting the T-beam 3.

[0039] In some implementations, in order to enable the T-beam 3 to move smoothly relative to the suspension anchor 1, the length of the T-beam 3 is often greater than the spacing between the five sets of suspension anchors 1.

[0040] like Figure 2 As shown, multiple roller brackets are fixed to the bottom of the vertical web 32 of the T-beam 3. The bottom of the roller brackets is rotatably connected to the adjusting rollers 5. The adjusting rollers 5 are connected to the protective net 8 through the protective net keel 6.

[0041] It should be noted that at least two roller supports are fixed to the bottom of the vertical web 32 of the T-beam 3; in this embodiment, two roller supports are fixed to the bottom of the vertical web 32 of the T-beam 3. In other embodiments, three, four or more roller supports may be fixed to the bottom of the vertical web 32 of the T-beam 3, with equal spacing between adjacent roller supports.

[0042] In this embodiment, the roller bracket is constructed by welding short steel bars into a trapezoidal bracket. The two inclined short steel bars of the trapezoidal bracket are welded and fixed to the bottom of the vertical web 32 of the T-beam 3. Straight short steel bars are welded between the two inclined short steel bars, such as... Figure 2 As shown, the adjusting roller 5 is rotatably connected to the short straight steel bar.

[0043] It should be noted that the straight-edge short steel bars are set parallel to the vertical web 32, and the adjusting roller 5 is perpendicular to the vertical web 32.

[0044] like Figure 2 As shown, the adjusting roller 5 is welded and fixed to the top of the protective netting keel 6. It should be noted that the welding point between the adjusting roller 5 and the protective netting keel 6 is located at the midpoint of the length of the protective netting keel 6 to prevent the protective netting keel 6 from sinking on one side.

[0045] It should also be noted that the protective netting keel 6 is perpendicular to the vertical web plate 32.

[0046] like Figure 2As shown, the top surfaces of multiple protective netting joists 6 are flush, and the protective net 8 is laid on top of the multiple protective netting joists 6 and fixedly connected to the top surfaces of the protective netting joists 6. In this embodiment, the protective net 8 is made of steel wire rope, and the protective net 8 is fixedly connected to the protective netting joists 6 by welding. In this embodiment, the function of the protective netting joists 6 is to provide support for the protective net 8, enabling the protective net 8 to be stretched open, protecting the top of the work area, and preventing falling rocks from directly injuring the construction workers in the work area.

[0047] It should be noted that the purpose of the protective net 8 is to prevent falling rocks from the top of the work area from falling directly and injuring the construction workers. Theoretically, the two ends of the protective net keel 6 should be attached to the top surface of the tunnel. However, since the tunnel is arched, the heights of the two ends of the protective net keel 6 on the tunnel top surface are different. In order to make the protective net keel 6 adapt to the tunnel arch, the adjusting rollers 5 are set to make the two ends of the protective net keel 6 adapt to the tunnel arch.

[0048] It should also be noted that, since the protective netting 8 needs to be moved, both ends of the protective netting keel 6 cannot be simultaneously pressed tightly against the tunnel roof. Therefore, in practice, both ends of the protective netting keel 6 maintain a set distance from the tunnel roof. In this embodiment, this set distance is ten centimeters, which is used to ensure that when the protective netting 8 needs to be moved, there will be no interference or friction between the two ends of the protective netting keel 6 and the tunnel roof.

[0049] It is also important to note that when a rock falls onto the protective netting 8 on one side of the suspended anchor bolt 1, causing that side of the netting 8 to become unbalanced, the adjusting roller 5 will cause the side with the rock to sink downwards, while the side without the rock will rise upwards to touch the tunnel ceiling. This will then support the sinking side, keeping the protective netting 8 balanced and protecting the work area. Even if rocks slide off the sinking side of the protective netting 8, they will only fall outside the work area; rocks will not fall directly down from the top of the work area.

[0050] like Figure 2 As shown, multiple sets of encryption nuts 7 are welded and fixed on the top surface of the protective net 8. Each set of encryption nuts 7 includes multiple encryption nuts 7, and the number of encryption nuts 7 in each set is not less than two. In this embodiment, four are set, and in other embodiments, more can be set.

[0051] In this embodiment, each set of encryption nuts 7 is arranged along the length of the protective netting keel 6. It should be noted that the spacing between encryption nuts 7 in the same set is consistent, and the spacing between multiple sets of encryption nuts 7 is also consistent.

[0052] The purpose of setting up the encryption nut 7 is to take into account that there may be rocks of different sizes falling from the top of the tunnel. When the falling rocks are small, the protective net 8 cannot block these small falling rocks. Reinforcing bars can be welded to the encryption nut 7, thereby reducing the mesh size of the protective net 8 accordingly.

[0053] Furthermore, welding steel bars to the encrypted nuts can also protect the protective netting 8.

[0054] like Figure 2 As shown, at the top of the transverse flange 31 of the T-beam 3, multiple sets of fixing nuts 4 are also provided along the length direction of the T-beam 3; each set of fixing nuts 4 includes two nuts, and the two fixing nuts 4 in the same set are also provided along the length direction of the T-beam 3.

[0055] In this embodiment, the fixing nut 4 can be fixed to the top of the transverse flange 31 of the T-beam 3 by welding.

[0056] It should also be noted that the distance between the two fixing nuts 4 in the same group is slightly larger than the diameter of the suspension anchor rod 1. That is, the distance between the two fixing nuts 4 in the same group is equal to the diameter of the suspension anchor rod 1 plus a set distance. In this embodiment, the distance between the two fixing nuts 4 in the same group is equal to the diameter of the suspension anchor rod 1 plus three centimeters.

[0057] It should also be noted that when one set of fixing nuts 4 is located on both sides of a certain set of suspension anchor rods 1, the fixing nuts 4 of other sets are also located on both sides of the corresponding suspension anchor rods 1 of other sets; that is, the spacing between adjacent sets of fixing nuts 4 is equal.

[0058] When the moving T-beam 3 reaches the corresponding position, multiple sets of fixing nuts 4 are positioned on both sides of the corresponding suspension anchor rod 1. Then, short steel bars of corresponding thickness are inserted into the fixing nuts 4 to restrict the movement of the T-beam 3 relative to the suspension anchor rod 1.

[0059] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A suspended, follow-up rockfall protection device for the top of a tunnel working area, installed on the top of the tunnel working area on one side of the central partition wall, characterized in that... It includes several sets of suspended anchors installed along the tunnel axis on the top surface of the tunnel, and T-shaped beams are slidably installed at the bottom of the suspended anchors; the T-shaped beams include transverse wing plates, and vertical web plates are fixedly connected to the center line of the length of the transverse wing plates; Multiple roller brackets are fixed to the bottom of the vertical web plate. An adjusting roller is rotatably connected to the bottom of each roller bracket. The adjusting roller is fixedly connected to the protective net keel. The top surfaces of the multiple protective net keels are flush. The protective net is laid on the top surfaces of the multiple protective net keels and fixedly connected to the top surfaces of the protective net keels.

2. The suspended follow-up type tunnel working area top rockfall protection device as described in claim 1, characterized in that, The tail of the suspension anchor is fixedly connected to a rotating rod, and a pulley is rotatably connected to the rotating rod; there are two suspension anchors in each group, and the suspension anchors in the same group are arranged opposite each other with the top surfaces of the pulleys flush, and there is a gap between the pulleys. The gap between the pulleys in adjacent groups is the same size.

3. The suspended follow-up type tunnel working area top rockfall protection device as described in claim 2, characterized in that, The transverse wing plate is erected above the pulleys of the multiple sets of suspended anchors, and the vertical web plate is set between two pulleys of the multiple sets of suspended anchors.

4. The suspended follow-up type tunnel working area top rockfall protection device as described in claim 1, characterized in that, The length of the T-beam is at least greater than the spacing between three adjacent sets of suspension anchors; at least two roller supports are fixed at the bottom of the vertical web.

5. A suspended follow-up type rockfall protection device for the top of a tunnel working area as described in claim 4, characterized in that, The roller bracket is made of short steel bars welded into a trapezoidal bracket. The two inclined short steel bars of the trapezoidal bracket are welded and fixed to the bottom of the vertical web plate. A straight short steel bar parallel to the vertical web plate is welded between the two inclined short steel bars. An adjusting roller is rotatably connected to the straight short steel bar.

6. A suspended, follow-up rockfall protection device for the roof of a tunnel working area as described in claim 1, characterized in that, The adjusting roller is located at the midpoint of the length of the protective netting keel, which is perpendicular to the vertical web.

7. A suspended follow-up type rockfall protection device for the top of a tunnel working area as described in claim 1, characterized in that, The two ends of the protective netting keel should maintain a set distance from the tunnel top surface and should not be in close contact with the tunnel top surface at the same time.

8. A suspended, follow-up rockfall protection device for the top of a tunnel working area as described in claim 1, characterized in that, Multiple sets of encryption nuts are welded and fixed to the top surface of the protective net, with no fewer than two encryption nuts in each set; each set of encryption nuts is set along the length of the protective net keel.

9. A suspended, follow-up rockfall protection device for the roof of a tunnel working area as described in claim 1, characterized in that, The top of the transverse wing plate is provided with multiple sets of fixing nuts along the length of the T-beam; each set of fixing nuts includes two nuts, and the fixing nuts in the same set are also provided along the length of the T-beam.

10. A suspended follow-up type rockfall protection device for the top of a tunnel working area as described in claim 9, characterized in that, The spacing between the fixing nuts in the same group is equal to the diameter of the suspension anchor plus the set length; when one group of fixing nuts is located on both sides of a certain group of suspension anchors, the fixing nuts of other groups are also located on both sides of the corresponding suspension anchors of other groups.

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