Novel supporting system for downward bending section of vertical shaft

Abstract

The utility model discloses a novel support system for a downward bending section of a vertical shaft, which comprises a zone A, a zone B, a zone C and a zone D. The zone A is provided with a plurality of layers, the inner wall of the zone A is provided with steel fiber reinforced concrete, each layer in the zone A is provided with an anchor rod and a first steel arch, the first steel arches are connected through connecting pieces and angle steel, and the anchor rods are connected with the first steel arches in a supporting manner; steel fiber reinforced concrete is arranged on the inner wall of the B area, and a second steel arch and an anchor rod are arranged on the adit section of the B area; multiple layers of areas C are arranged, steel fiber reinforced concrete is arranged on the inner walls of the areas C, and second steel arches and anchor rods are arranged on the adit sections of the areas C; steel fiber concrete is arranged on the inner wall of the D, a fourth steel arch is arranged in the D area, the first steel arch is connected with the fourth steel arch, and the fourth steel arch supports the first steel arch of the last truss in the A area. According to the utility model, the steel arches support each other, so that the downward bending section can be strongly supported by the steel arches, the stress is reasonable, the problem of excavation stability of the well wall of the downward bending section is effectively solved, and the supporting practicability of the downward bending section with poor geological conditions of surrounding rocks is strong.

Description

Technical Field

[0001] This utility model relates to the field of vertical shafts, and in particular to a novel support system for the lower bend section of a vertical shaft. Background Technology

[0002] During shaft excavation, the bottom is usually connected to a high-pressure horizontal tunnel. The junction between the shaft and the horizontal tunnel is often a design challenge. The usual practice is to use shotcrete and anchor support to maintain the stability of the surrounding rock. For the downward curve section with poor surrounding rock geological conditions, a fan-shaped steel arch support is considered. However, this is usually only applicable to the curve section with a small excavation diameter and a small turning radius. Usually, during shaft excavation, the outer sidewall of the shaft is excavated to the bottom of the shaft, making it difficult to install a steel arch support on the sidewall. Therefore, for the downward curve section with a large shaft diameter and a large turning radius, it is often necessary to consider other systems to install steel arches to achieve the purpose of strong support.

[0003] Based on the above, this utility model proposes a type of steel arch frame that is connected and supported by each other in different directions, in order to effectively solve the above problems. Utility Model Content

[0004] In order to solve the problems existing in the background technology, this utility model provides a novel support system for the downward bend section of a vertical shaft.

[0005] The present invention adopts the following technical solution:

[0006] A novel support system for the downward curve section of a vertical shaft includes zones A, B, C, and D. Zone A has multiple layers, and the inner walls of each layer are made of steel fiber reinforced concrete. Each layer in Zone A has anchor bolts and a first steel arch frame. The first steel arch frames are connected by connectors and angle steel, and the anchor bolts support and connect the first steel arch frames. Zone B has an inner wall made of steel fiber reinforced concrete, and the horizontal tunnel section of Zone B has a second steel arch frame and anchor bolts. Zone C has multiple layers, and the bottom is stepped. The inner walls of Zone C are all made of steel fiber reinforced concrete, and the horizontal tunnel section of Zone C has a second steel arch frame and anchor bolts. Zone D has an inner wall made of steel fiber reinforced concrete, and the bottom is stepped. Zone D has a fourth steel arch frame, and the first steel arch frame is connected to the fourth steel arch frame. The fourth steel arch frame supports the last first steel arch frame in Zone A.

[0007] Furthermore, the second steel arch frame is provided with mutually perpendicular foundation support steel plates and foundation bottom steel plates.

[0008] Furthermore, the first steel arch frame was welded to the anchor rod.

[0009] Furthermore, mesh was installed and sprayed with concrete in areas A, B, and C, and area A was equipped with multiple randomly distributed drainage holes.

[0010] Furthermore, the first steel arch frame is assembled and connected by connecting steel plates and bolts, and the connecting component is a longitudinal connecting rib.

[0011] Furthermore, the second steel arch frame is assembled and connected by connecting steel plates and bolts.

[0012] Furthermore, the third steel arch frame is assembled and connected by connecting steel plates and bolts.

[0013] Furthermore, the first steel arch frame and the fourth steel arch frame are connected by steel plates.

[0014] Furthermore, the first steel arch frame of the last slab in Area A was welded to the connecting plate.

[0015] This utility model provides a novel support system for the lower bend section of a vertical shaft: steel arch frames support each other, making it possible to use steel arch frames for strong support in the lower bend section. The system has reasonable stress distribution and effectively solves the problem of shaft wall stability during excavation in the lower bend section. It is highly practical for supporting the lower bend section with poor surrounding rock geological conditions. Attached Figure Description

[0016] Figure 1 This is a longitudinal sectional view of the present invention;

[0017] Figure 2 This is a diagram showing the excavation steps of this utility model;

[0018] Figure 3 District Figure 1 Section 1-1 of Area A in the middle;

[0019] Figure 4 The diagram shows the structural drawings of each steel arch frame in Area A.

[0020] Figure 5 This is a structural diagram of the steel arch frame in area B.

[0021] Figure 6 for Figure 5 Enlarged view at point I;

[0022] Figure 7 for Figure 5 Enlarged view at point II;

[0023] Figure 8 for Figure 5 aa cross section diagram;

[0024] Figure 9 Structural diagrams of the steel arch frames in Zone C;

[0025] Figure 10 Here are the structural diagrams of the steel arch frames in Zone D;

[0026] Figure 11 for Figure 10 Enlarged view of section III in the middle;

[0027] Figure 12 for Figure 11 The cross-sectional view of bb in the middle.

[0028] The markings in the attached diagram are as follows: 1-Anchor bolt, 2-Excavation boundary line, 3-Steel fiber reinforced concrete, 4-Wire mesh and sprayed concrete, 5-First steel arch, 6-Second steel arch, 7-Third steel arch, 8-Fourth steel arch, 9-Drainage hole, 10-Longitudinal steel arch connecting bar, 11-First connecting steel plate, 12-Angle steel, 13-Fillet weld, 14-Foundation support steel plate, 15-Foundation bottom steel plate, 16-Bolt, 17-Second connecting steel plate, 18-Third connecting steel plate, 19-Stepped shape. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] See attached document Figure 1-12 A novel support system for the downward curve section of a vertical shaft includes zones A, B, C, and D. Zone A has multiple layers, and the inner walls of each layer are made of steel fiber reinforced concrete 3. Each layer in Zone A is equipped with anchor bolts 1 and a first steel arch frame 5. The first steel arch frames 5 are connected to each other by connectors and angle steel 12. The anchor bolts 1 support and connect the first steel arch frames 5. The inner wall of Zone B is made of steel fiber reinforced concrete 3. The horizontal tunnel section of Zone B is equipped with a second steel arch frame 6 and anchor bolts 1. Zone C has multiple layers, and the bottom is stepped 19. The inner wall of Zone C is made of steel fiber reinforced concrete 3. The horizontal tunnel section of Zone C is equipped with a second steel arch frame 6 and anchor bolts 1. The inner wall of Zone D is made of steel fiber reinforced concrete 3, and the bottom is stepped 19. Zone D is equipped with a fourth steel arch frame 8. The first steel arch frame 5 is connected to the fourth steel arch frame 8. The fourth steel arch frame 8 supports the last first steel arch frame 5 in Zone A.

[0031] The second steel arch frame 6 is provided with mutually perpendicular foundation support steel plates 14 and foundation bottom steel plates 15.

[0032] The first steel arch frame 5 is welded to the anchor rod 1.

[0033] Areas A, B, and C are all filled with wire mesh and sprayed with concrete 4, and area A has multiple randomly distributed drainage holes 9.

[0034] The first steel arch frame 5 is assembled and connected by the first connecting steel plate 15 and bolts 16, and the connecting component is a longitudinal connecting rib.

[0035] The second steel arch frame 6 is assembled and connected by the second connecting steel plate 17 and bolts 16.

[0036] The third steel arch frame 7 is assembled and connected by the third connecting steel plate 18 and bolts 16.

[0037] The first steel arch frame 5 and the fourth steel arch frame 8 are connected by steel plates.

[0038] The first steel arch frame 5 of the last truss in Area A is welded to the connecting plate.

[0039] The above-mentioned novel support method for the lower bend section of a vertical shaft is as follows:

[0040] a. Excavate in the order of A, B, C, and D.

[0041] b. Blasting excavation of area A, with 3 layers of steel fiber reinforced concrete sprayed after each layer of excavation;

[0042] c. Install anchor bolt 1 and install the first steel arch frame 5. Anchor bolt 1 supports and connects to the first steel arch frame 5. The first steel arch frame 5 is welded to anchor bolt 1.

[0043] d. Seal area A by hanging wire mesh and spraying concrete 4, and randomly drill drainage holes 9;

[0044] e. Excavate and install steel arch frames A-1 to A-10 in A-area in sequence. The first steel arch frame 5 is assembled and connected by the first connecting steel plate 15 and bolts. The first steel arch frames 5 are connected by longitudinal connecting bars 10 and angle steel.

[0045] f. Excavate area B, spray steel fiber concrete 3, and install the second steel arch frame 6 and anchor rod 1 of the horizontal tunnel section. The second steel arch frame 6 is assembled and connected by the second connecting steel plate 17 and bolts 16. Then, wire mesh is hung and concrete is sprayed again 4.

[0046] g. Excavate area C, spray steel fiber concrete 3, and install the third steel arch frame 7 and anchor rod 1 for the horizontal tunnel section. The third steel arch frame 7 is assembled and connected by the third connecting steel plate 18 and bolts 16. Then, wire mesh is hung and concrete is sprayed again 4.

[0047] h. Excavate area D, using stepped excavation on the outer side of the lower bend section, and spray 3g of steel fiber concrete.

[0048] i. Erect the fourth steel arch frame 8 in area D to support the first steel arch frame 5 of the last frame in area A. Use steel plate 18 to connect the first steel arch frame 5 to the fourth steel arch frame 8. Weld the first steel arch frame 5 of the last frame to the connecting plate 18. The first steel arch frame 5 of the last frame has ten sections.

[0049] The first steel arch frame 5, the second steel arch frame 6, and the third steel arch frame 7 were all assembled and connected inside the tunnel.

[0050] The thickness of the sprayed steel fiber concrete 3 is preferably 5cm, and the thickness of the reinforced concrete after meshing and re-spraying is best at 20cm.

[0051] Figure 2 shows the excavation boundary line, Figure 9 shows the longitudinal steel arch frame connecting reinforcement, and Figure 13 shows the fillet weld.

[0052] In this embodiment, the closed steel arch frame and shotcrete support are combined. It is necessary to avoid large-scale excavation to the bottom on the outer edge of the lower bend section as much as possible in order to reduce the size of the horizontal or vertical steel arch frame. Step excavation 19 and shotcrete support 1 are used to ensure the safety of the slope on this side. The last steel arch frame 5 in area A is supported by the steel arch frame 8 in area D on the side of the flat tunnel.

[0053] This utility model addresses the poor geological conditions of the downward bend section by adopting a reasonable excavation method on the outer side of the bend section, combined with a reasonable excavation and support sequence. It utilizes the principle of superimposed steel arch frames supporting each other, making the entire steel arch frame support system a complete whole. Combined with anchor bolt support and wire mesh and shotcrete support, it forms a joint force-bearing support system for the downward bend section.

[0054] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A novel support system for the downward bend section of a vertical shaft, characterized in that, The system includes zones A, B, C, and D. Zone A has multiple layers, and the inner walls of each layer are made of steel fiber reinforced concrete. Each layer in Zone A has anchor bolts and a first steel arch frame. The first steel arch frames are connected by connectors and angle steel, and the anchor bolts support and connect the first steel arch frames. Zone B has steel fiber reinforced concrete inner walls, and the horizontal tunnel section of Zone B has a second steel arch frame and anchor bolts. Zone C has multiple layers, and the bottom is stepped. The inner walls of Zone C are all made of steel fiber reinforced concrete, and the horizontal tunnel section of Zone C has a second steel arch frame and anchor bolts. Zone D has steel fiber reinforced concrete inner walls, and the bottom is stepped. Zone D has a fourth steel arch frame, and the first steel arch frame is connected to the fourth steel arch frame. The fourth steel arch frame supports the last first steel arch frame in Zone A.

2. The novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, The second steel arch frame is supported by mutually perpendicular foundation support steel plates and foundation bottom steel plates.

3. The novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, The first steel arch frame is welded to the anchor rod.

4. A novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, Areas A, B, and C are all filled with wire mesh and then sprayed with concrete. Area A also has multiple randomly distributed drainage holes.

5. A novel support system for the downward bend of a vertical shaft according to claim 1, characterized in that, The first steel arch frame is assembled and connected by connecting steel plates and bolts, and the connecting parts are longitudinal connecting ribs.

6. A novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, The second steel arch frame is assembled and connected by connecting steel plates and bolts.

7. A novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, The third steel arch frame is assembled and connected by connecting steel plates and bolts.

8. A novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, The first steel arch frame and the fourth steel arch frame are connected by steel plates.

9. A novel support system for the lower bend section of a vertical shaft according to claim 1, characterized in that, The first steel arch frame of the last slab in Area A was welded to the connecting plate.

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