Temporary supporting device for lower step excavation suspension net plate and mounting method
By using temporary support devices for suspended mesh panels during tunnel construction, the construction safety and progress problems caused by the lack of support on the palm surface are solved, and rapid and effective temporary support is achieved to ensure construction safety and progress.
Patent Information
- Application Number
- CN202411625296.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-02-18
AI Technical Summary
During the tunnel construction process, due to the lack of effective support, the palm surface is prone to collapse, deformation or rock explosion, which affects the construction safety and progress.
The temporary support device for excavating the suspension mesh plate is adopted. The device includes cantilever steel plate, flower basket bolts, wire rope, protective steel plate and wire rope mesh. The protective steel plate is fixed by rotating the anchor foot fixing pin, and the tension and protection of the wire rope mesh is used. The gravity of the steel plate forms a combined force to stabilize the palm surface.
The device can be quickly installed, providing effective temporary support, preventing the palm surface from collapse or deforming, ensuring construction safety, and not affecting subsequent construction progress.
Smart Images
Figure CN119466887A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tunnel construction, and in particular to a temporary support device for a suspended mesh plate for excavating a lower step and an installation method thereof. Background Art
[0002] The tunnel face (also called the support face) is the disturbed rock mass that is often exposed during tunnel construction. As it is a temporary structure during the excavation process, it is often difficult to obtain good support, which leads to the occurrence of some engineering diseases, such as local collapse of the tunnel face in weak surrounding rock, large deformation of the tunnel face in high-in-situ stress soft rock, or rock burst of the tunnel face in high-in-situ stress hard rock. If the rock mass at the tunnel face can be supported like the surrounding rock around the tunnel, it will be of great significance to the safety of the construction process.
[0003] During tunnel construction, temporary shotcrete is often used to support the face after excavation. This is a risky construction operation after excavation, and when the surrounding rock conditions are extremely poor, mesh spraying is required. There are also existing methods of using mechanical structures to support the face, but the installation and disassembly of the structure takes a long time, and the space occupied by the structure itself will also affect the subsequent construction, thereby affecting the construction progress. Summary of the invention
[0004] The purpose of the present invention is to provide a temporary support device for suspended mesh panels for lower step excavation and an installation method thereof, so as to solve the problems existing in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the present invention provides a temporary support device for a suspended mesh plate for excavating a lower step, comprising a cantilevered steel plate, which is pre-welded at a specified position during the processing of a steel arch frame, and mainly supports the temporary support structure below, and a basket bolt is connected to the cantilevered steel plate through a hook, and a wire rope is connected to the end of the basket bolt away from the cantilevered steel plate, and a protective steel plate is connected to the free end of the wire rope, and a wire rope net is also connected to the wire rope, and a side of the wire rope net away from the wire rope is connected to the protective steel plate, and an end of the protective steel plate away from the wire rope extends to the ground, and ground anchor rotation fixing pins are provided on both sides of the protective steel plate close to the ground.
[0006] Preferably, the anchor rotating fixing pin includes a rotating disk, a pin sleeve arranged on the rotating disk and a pin rod inserted inside the pin sleeve, the pin sleeve is used to constrain the pin rod so that the pin rod can slide freely along the inside of the pin sleeve. When in use, the pin rod is fixed to the pin sleeve by screws, buckles or other components that can be used for fixing. The pin rod is inserted into the ground soil to form a hinge point to fix the bottom of the entire protective steel plate, so that the entire protective structure has no displacement in the XYZ directions, but can rotate, so that the protective steel plate can be close to the face after being subjected to the upper tensioning force.
[0007] Preferably, the rotating disk is arranged on the side wall of the protective steel plate, and the rotating disk drives the pin sleeve to rotate 360°.
[0008] Preferably, the wire rope net is flexibly connected, and after being tightened, it covers and compacts the upper part of the soil to be supported. The combined force of the self-gravity of the protective steel plate and the tension of the wire rope net forms a combined force toward the soil to be supported, so as to stabilize the soil.
[0009] A method for installing a temporary support device for a suspended mesh plate for excavating a lower step, comprising the following steps: Step 1: After the excavation of the lower step is completed, drill holes in the ground according to the distance between the rotating fixing pins of the anchors on both sides of the protective steel plate, and the drilling depth shall not be less than 10 cm; Step 2: Use auxiliary equipment to hoist the protective steel plate, rotate the rotating disk at the same time, and insert the two pins into the holes drilled in step 1 with the help of the auxiliary equipment and lock them; Step 3: Connect the steel wire rope to the cantilevered steel plate on the front arch through the basket bolts, rotate the basket bolts to gradually tighten the steel wire rope toward the soil to be supported, remove the auxiliary equipment, and observe the pin rod in real time during the tightening process. When the pin rod loosens upward, a suspension structure is formed, and the tightening of the basket structure is stopped. Observe the degree of tightening of the wire rope net on the upper part of the face and the degree of fit between the protective steel plate and the face.
[0010] Therefore, the present invention adopts the above-mentioned temporary support device and installation method for the suspended mesh plate for excavation of the lower step, and realizes temporary support of the face through the combined structure of the suspended flexible steel wire rope net and the rigid protective steel plate, thereby providing safe working conditions for the face personnel during the lower step construction process. The device is easy to install, and the space occupied by the structure itself will not affect subsequent construction.
[0011] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural schematic diagram of an embodiment of a temporary support device for suspended mesh panels for excavating a lower step according to the present invention; Figure 2 A schematic diagram of a rotating fixing pin for a ground anchor according to an embodiment of the present invention; Reference numerals 1. Cantilever steel plate; 2. Basket bolt; 3. Steel wire rope; 4. Protective steel plate; 5. Wire rope net; 6. Anchor rotating fixing pin; 61. Rotating plate; 62. Pin sleeve; 63. Pin rod. DETAILED DESCRIPTION
[0013] Example In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0014] like Figure 1 As shown, a temporary support device for suspended mesh panels for excavating lower steps includes a cantilevered steel plate 1. The cantilevered steel plate 1 is pre-welded at a specified position during the processing of the steel arch frame, and mainly supports the temporary support structure below. A flower basket bolt 2 is connected to the cantilevered steel plate 1 through a hook. The end of the flower basket bolt 2 away from the cantilevered steel plate 1 is connected to a steel wire rope 3. The free end of the steel wire rope 3 is connected to a protective steel plate 4. The steel wire rope 3 is also connected to a wire rope net 5. The side of the wire rope net 5 away from the wire rope 3 is connected to the protective steel plate 4. The end of the protective steel plate 4 away from the wire rope 3 extends to the ground, and both sides of the protective steel plate 4 close to the ground are provided with anchor rotation fixing pins 6. Figure 2 As shown, the anchor rotating fixing pin 6 includes a rotating disk 61 arranged on the two side walls of the protective steel plate 4, a pin sleeve 62 arranged on the rotating disk 61 and a pin rod 63 inserted into the pin sleeve 62. The rotating disk 61 can drive the pin sleeve 62 to rotate 360°. The pin sleeve 62 is used to constrain the pin rod 63 so that the pin rod 63 can slide freely along the inside of the pin sleeve 62. When in use, the pin rod 63 is fixed to the pin sleeve 62 by screws, buckles or other components that can be used for fixing. The pin rod 63 is inserted into the ground soil to form a hinge point to fix the bottom of the entire protective steel plate 4, so that the entire protective structure has no displacement in the XYZ directions, but can rotate, so that the protective steel plate 4 can be close to the face after being subjected to the upper tensioning force.
[0015] The wire rope net 5 is flexibly connected. After being tightened, it covers and compacts the upper part of the soil to be supported. The combined force of the self-weight of the protective steel plate 4 and the tension of the wire rope net forms a combined force toward the soil to be supported, which is used to stabilize the soil.
[0016] A method for installing a temporary support device for a suspended mesh plate for excavating a lower step, comprising the following steps: Step 1: After the excavation of the lower step is completed, the ground soil is drilled according to the distance between the ground anchor rotation fixing pins 6 on both sides of the protective steel plate 4, and the drilling depth is not less than 10 cm; Step 2: Use auxiliary equipment to hoist the protective steel plate 4, and rotate the rotating disk 61 at the same time. With the help of the auxiliary equipment, insert the two pins 63 into the holes drilled in step 1 and lock them; Step three, connect the steel wire rope 3 to the cantilevered steel plate 1 on the front arch through the basket bolt 2, rotate the basket bolt 2 to gradually tighten the steel wire rope 3 toward the soil to be supported, remove the auxiliary equipment, and observe the pin rod 63 in real time during the tightening process. When the pin rod 63 loosens upward, a suspension structure is formed, and the tightening of the basket structure is stopped. Observe the degree of tightening of the steel wire rope net 5 on the upper part of the palm face and the degree of fit between the protective steel plate 4 and the palm face.
[0017] Working principle: By rotating the anchor pins 6 on both sides of the bottom of the protective steel plate 4, the entire protective structure forms a rigid structure with no displacement at the bottom but can rotate. When the upper basket bolts 2 are gradually tightened, under the interaction of the upper tension and the self-weight of the protective steel plate 4, and because the wire rope net 5 is a flexible structure, the soil on the upper part of the palm face is compacted by the wire rope net 5 in all directions, forming a good wrapping state, which plays a role in stabilizing the palm face. At the same time, because the suspension wire rope 3 of the protective steel plate 4 is tightened together, the protective steel plate 4 rotates around the foot toward the palm face and fits as closely as possible to the soil to be supported, which plays a role in protecting the upper rock and supporting the palm face soil.
[0018] Therefore, the present invention adopts the above-mentioned temporary support device and installation method of the suspended mesh plate for excavation of the lower step. The combined protective structure of the suspended flexible wire rope net and the rigid protective steel plate can not only protect the fallen rocks on the soil to be supported, but also support the soil on the face, thereby providing safe working conditions for the personnel on the face during the lower step construction process.
[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.
Claims
1. A temporary support device for suspended mesh panels for excavating lower steps, characterized in that: It includes a cantilevered steel plate, which is connected to a basket bolt via a hook, the end of the basket bolt away from the cantilevered steel plate is connected to a steel wire rope, the free end of the steel wire rope is connected to a protective steel plate, the steel wire rope is also connected to a wire rope net, the side of the wire rope net away from the steel wire rope is connected to the protective steel plate, the end of the protective steel plate away from the steel wire rope extends to the ground, and ground anchor rotation fixing pins are provided on both sides of the protective steel plate close to the ground.
2. A temporary support device for suspended mesh panels for lower step excavation according to claim 1, characterized in that: The anchor rotation fixing pin comprises a rotating disk, a pin sleeve arranged on the rotating disk and a pin rod inserted in the pin sleeve.
3. A temporary support device for suspended mesh panels for lower step excavation according to claim 2, characterized in that: The rotating disk is arranged on the side wall of the protective steel plate, and the rotating disk drives the pin sleeve to rotate 360 degrees.
4. The temporary support device for suspended mesh panels for lower step excavation according to claim 1 is characterized in that: The wire rope net is flexibly connected, and a combined force is formed toward the soil to be supported through the combined force of the self-weight of the protective steel plate and the tension of the wire rope net, so as to stabilize the soil.
5. A method for installing a temporary support device for suspended mesh panels for lower step excavation as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: After the excavation of the lower step is completed, drill holes in the ground according to the distance between the rotating fixing pins of the anchors on both sides of the protective steel plate, and the drilling depth shall not be less than 10 cm; Step 2: Use auxiliary equipment to hoist the protective steel plate, rotate the rotating disk at the same time, and insert the two pins into the holes drilled in step 1 with the help of the auxiliary equipment and lock them; Step 3: Connect the steel wire rope to the cantilevered steel plate on the front arch through the basket bolts, rotate the basket bolts to gradually tighten the steel wire rope toward the soil to be supported, remove the auxiliary equipment, and observe the pin rod in real time during the tightening process. When the pin rod loosens upward, a suspension structure is formed, and the tightening of the basket structure is stopped. Observe the degree of tightening of the wire rope net on the upper part of the face and the degree of fit between the protective steel plate and the face.