A steel arch support structure for open cut excavation

Abstract

The utility model relates to emptying hole supporting structure technical field, especially a kind of steel arch support structure of emptying hole hole body excavation, including arch member one, two arch member two, two inner corner plates and two outer corner plates, the inner corner plate and outer corner plate of one end of arch member one and two arch member two are evenly fixedly installed with one, the inner corner plate and outer corner plate of arch member one both ends are mutually fixed, the inner corner plate and outer corner plate of one end of two arch member two are mutually fixed, the inner corner plate of arch member one both ends and the inner corner plate of one end of arch member two are mutually fixed.The utility model among them device, by setting inner corner plate, outer corner plate, inner supporting plate and outer supporting plate, realize the initial splicing positioning of arch member one and arch member two, inner supporting plate and outer supporting plate are abutted with the arc surface of arch member one and arch member two, and the concentrated load of splicing node is dispersed to the contact surface of supporting plate and component, and the surface stress alternative point stress is formed.

Description

Technical Field

[0001] This utility model relates to the technical field of support structure for venting tunnels, and more specifically, to a steel arch support structure for the excavation of a venting tunnel. Background Technology

[0002] In the excavation of drainage tunnels in water conservancy projects, steel arch support is the core means of maintaining the stability of the surrounding rock and preventing collapse. Traditional steel arch support structures mainly rely on bolts to connect the ends of the arch frame, so that the pressure of the surrounding rock acts directly on the connecting bolts.

[0003] During the excavation of the venting tunnel, especially when blasting is required, the internal structure of the tunnel will vibrate. At this time, the steel arch frame connected only by bolts has obvious defects. First, the bolts are subjected to large pressure for a long time, which makes them prone to deformation and breakage, resulting in loosening of the arch frame connection and seriously affecting the overall stability of the arch frame, making it difficult to reliably support the surrounding rock. Second, relying solely on bolt connections, the connection between the various components of the arch frame is prone to shaking when the pressure of the surrounding rock changes, and cannot provide continuous and stable support for the surrounding rock. Utility Model Content

[0004] Based on the aforementioned technical problems regarding bolts being subjected to high pressure over a long period of time, which are prone to deformation and breakage, leading to loosening of the arch frame connection and seriously affecting the overall stability of the arch frame, making it difficult to reliably support the surrounding rock; and relying solely on bolt connections, the connections between the various components of the arch frame are prone to shaking when the pressure of the surrounding rock changes, making it impossible to provide continuous and stable support for the surrounding rock, this utility model proposes a steel arch frame support structure for the excavation of a venting tunnel.

[0005] This utility model proposes a steel arch support structure for excavating a venting tunnel, comprising an arch frame component one, two arch frame components two, two inner corner plates, and two outer corner plates. An inner corner plate and an outer corner plate are fixedly installed at both ends of the arch frame component one and at one end of each of the two arch frame components two. The inner and outer corner plates at both ends of the arch frame component one are mutually fixed, and the inner and outer corner plates at one end of each of the two arch frame components two are mutually fixed. The inner corner plates at both ends of the arch frame component one are fixed to the inner corner plates at one end of each of the arch frame components two. The inner corner plates are fixed to each other. The outer corner plates at both ends of the arch frame component one are fixed to each other. The outer corner plates at both ends of the arch frame component one and the outer corner plates at one end of the arch frame component two are slidably connected to an outer support plate. The inner corner plates at both ends of the arch frame component one and the inner corner plates at one end of the arch frame component two are slidably connected to an inner support plate. The outer arc walls of the inner support plates abut against the arch frame component one and the arch frame component two. The inner arc walls of the outer support plates abut against the arch frame component one and the arch frame component two.

[0006] Preferably, the first arch frame component and the second arch frame component are combined to form an arch structure, and the cross-sections of the first arch frame component and the second arch frame component are both I-shaped.

[0007] Preferably, the steel arch support structure further includes a plurality of first bolt fasteners. Both the outer walls of the first arch support member and the second arch support member are provided with connection holes, and both the outer walls of the inner support plate and the outer support plate are provided with first mounting holes. The first bolt fasteners fix the inner support plate to the outer walls of the first arch support member and the second arch support member, respectively, through the connection holes and the first mounting holes, and fix the outer support plate to the outer walls of the first arch support member and the second arch support member.

[0008] Preferably, the inner corner plate and the outer corner plate are provided with a first fixing hole, and a second bolt fastener is installed in the first fixing hole. The inner corner plate at one end of the arch frame component and the two ends of the arch frame component are fixed to each other by the second bolt fastener, and the two outer corner plates at one end of the arch frame component and the two ends of the arch frame component are fixed to each other.

[0009] Preferably, the inner corner plate and the outer corner plate are provided with a second fixing hole on their outer walls. A third bolt fastener is installed in the second fixing hole, and the inner corner plate and the outer corner plate at the same end of the arch frame are fixed to each other by the third bolt fastener.

[0010] Preferably, the outer wall of each inner corner plate is provided with an inner through hole, and the inner corner plate is slidably connected to the inner through hole.

[0011] Preferably, the outer corner plates are provided with external perforations on their outer walls, and the outer corner plates are slidably connected to the external perforations.

[0012] Preferably, the steel arch support structure further includes multiple pads, each pad having anti-slip plates fixedly connected to both sides. The outer walls of the pads and anti-slip plates are provided with second mounting holes. The third bolt fasteners fix the inner and outer corner plates of the same end of the arch frame component one to each other through the second mounting holes, and fix the inner and outer corner plates of the same end of the arch frame component two to each other.

[0013] The beneficial effects of this utility model, achieved through the above technical solution, are as follows: 1. By setting inner corner plates, outer corner plates, inner support plates and outer support plates, the initial splicing and positioning of arch frame component one and arch frame component two are achieved. The inner support plates and outer support plates abut against the arc surfaces of arch frame component one and arch frame component two, dispersing the concentrated load of the splicing node to the contact surface between the support plate and the component, forming a surface force to replace the point force. Even under dynamic loads such as blasting vibrations, the bolts only bear part of the fixing force, not all of the surrounding rock pressure, avoiding deformation and breakage caused by long-term high pressure on the bolts, ensuring the integrity of the arch frame connection nodes. The inner and outer support plates form a wrapping constraint from the inside and outside of the arch frame components, respectively. With the positioning of the inner and outer corner plates on both sides, the splicing points of the arch frame components are limited by multiple structures, preventing lateral or longitudinal swaying. The tight contact between the inner and outer support plates and the components eliminates the connection gaps. Even when the surrounding rock pressure changes, the nodes will not have displacement deviations, ensuring that the arch frame always maintains a stable arch structure, providing continuous and uniform support force to the surrounding rock, avoiding support failure caused by node swaying, and maintaining the stability of the tunnel surrounding rock.

[0014] 2. The anti-slip pads on both sides of the pad increase the friction between the inner and outer corner plates and the bolts and components, preventing the bolts from loosening due to vibration of the hole; the pad can distribute the pressure of the bolts not aligning with the plate, prevent the corner plates from being deformed locally due to bolt compression, and extend the service life of the corner plates; at the same time, the elastic deformation of the anti-slip pads can buffer part of the vibration load, further improving the stability of the connection node. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the structure of the pad and anti-slip sheet of this utility model; Figure 4 This is a schematic diagram of the structure of the inner support plate and the outer support plate of this utility model; Figure 5 This is a partial structural schematic diagram of arch frame component one and arch frame component two of this utility model; Figure 6 This is a schematic diagram of the structure of the inner corner plate and the outer corner plate of this utility model.

[0016] In the diagram: 1. Arch frame component one; 2. Arch frame component two; 3. Connecting hole; 4. Inner corner plate; 401. Inner through hole; 5. Outer corner plate; 6. Outer through hole; 7. First fixing hole; 8. Second fixing hole; 9. Inner support plate; 10. Outer support plate; 1001. First mounting hole; 11. Pad; 12. Anti-slip plate; 13. Second mounting hole; 14. First bolt fastener; 15. Second bolt fastener; 16. Third bolt fastener. Detailed Implementation

[0017] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model. In this utility model, unless otherwise expressly specified and limited, the term "fixed connection" should be interpreted broadly. For example, "fixed connection" can mean fixed installation, detachable connection, or integral; it can mean mechanical connection or electrical connection; it can mean direct connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, a steel arch support structure for excavating a venting tunnel includes an arch frame component 1, two arch frame components 2, two inner corner plates 4, and two outer corner plates 5. An inner corner plate 4 and an outer corner plate 5 are fixedly installed at both ends of the arch frame component 1 and at one end of each of the two arch frame components 2. The inner corner plates 4 and outer corner plates 5 at both ends of the arch frame component 1 are mutually fixed, and the inner corner plates 4 and outer corner plates 5 at one end of each of the two arch frame components 2 are mutually fixed. The inner corner plates 4 at both ends of the arch frame component 1 and the inner corner plates 4 at one end of each of the arch frame components 2 are also mutually fixed. The outer corner plates 5 at both ends of the arch frame component 1 are fixed to each other with the outer corner plate 5 at one end of the arch frame component 2. An outer support plate 10 is slidably connected to the outer corner plates 5 at both ends of the arch frame component 1 and the outer corner plate 5 at one end of the arch frame component 2. An inner support plate 9 is slidably connected to the inner corner plates 4 at both ends of the arch frame component 1 and the inner corner plate 4 at one end of the arch frame component 2. The outer arc wall of the inner support plate 9 abuts against the arch frame component 1 and the arch frame component 2. The inner arc wall of the outer support plate 10 abuts against the arch frame component 1 and the arch frame component 2.

[0019] The design of inner corner plate 4, outer corner plate 5, inner support plate 9, and outer support plate 10 can replace the traditional single bolt connection. The contact surfaces of inner support plate 9 and outer support plate 10 with arch frame component 1 and arch frame component 2 transform the force transmission of the splicing node from bolt transmission to surface contact transmission, solving the defect that bolts are prone to deformation and breakage under long-term high pressure. At the same time, inner and outer support plates 10 form a wrapping constraint to prevent the splicing of arch frame components from shaking, improve the overall stability of the arch frame, and ensure reliable support for the surrounding rock.

[0020] like Figure 1 As shown, arch frame component 1 and arch frame component 2 are combined to form an arch structure, and the cross-sections of both arch frame component 1 and arch frame component 2 are I-shaped.

[0021] The combination of arch frame component 1 and arch frame component 2 forms an arch structure, which can match the arc-shaped contour of the venting tunnel body and can convert the radial pressure of the surrounding rock into the axial pressure of the arch frame, thereby improving the structure's resistance to collapse. Compared with ordinary rectangular cross-sections, the I-shaped cross-section can improve bending and shear strength, withstand greater surrounding rock loads and blasting vibration impacts, and avoid deformation of the arch frame components themselves.

[0022] like Figure 2 , Figure 4 and Figure 5 As shown, the steel arch support structure also includes multiple first bolt fasteners 14. The outer walls of arch frame component 1 and arch frame component 2 are provided with connection holes 3, and the outer walls of inner support plate 9 and outer support plate 10 are provided with first mounting holes 1001. The first bolt fasteners 14 fix the inner support plate 9 to the outer walls of arch frame component 1 and arch frame component 2 through the connection holes 3 and the first mounting holes 1001, respectively, and fix the outer support plate 10 to the outer walls of arch frame component 1 and arch frame component 2.

[0023] The first bolt fastener 14, through the connecting hole 3 and the first mounting hole 1001, rigidly fixes the inner support plate 9, the outer support plate 10, and the arch frame components, ensuring that the support plate does not shift when under force and stably transmits the load.

[0024] like Figure 6 As shown, the inner corner plate 4 and the outer corner plate 5 are both provided with a first fixing hole 7. A second bolt fastener 15 is installed in the first fixing hole 7. The inner corner plate 4 at the end of the arch frame component 1 and the end of the arch frame component 2 are fixed to each other by the second bolt fastener 15, and the two outer corner plates 5 at the end of the arch frame component 1 and the end of the arch frame component 2 are fixed to each other.

[0025] The second bolt fastener 15, through the first fixing hole 7, fixes the inner corner plate 4 and outer corner plate 5 of the arch frame component 1 and the arch frame component 2 respectively, forming a double bolt constraint on the splicing node, thus avoiding node failure caused by bolt loosening in one direction.

[0026] like Figure 2 As shown, the inner corner plate 4 and the outer corner plate 5 are both provided with a second fixing hole 8. A third bolt fastener 16 is installed in the second fixing hole 8, and the inner corner plate 4 and the outer corner plate 5 at the same end of the arch frame component 1 are fixed to each other by the third bolt fastener 16.

[0027] The third bolt fastener 16 fixes the inner corner plate 4 and the outer corner plate 5 at the same end of the component through the second fixing hole 8, so as to avoid the connection gap caused by the relative displacement of the inner corner plate 4 and the outer corner plate 5.

[0028] like Figure 2 , Figure 3 and Figure 6As shown, the outer walls of the inner corner plates 4 are all provided with inner through holes 401, and the inner corner plates 4 are slidably connected to the inner through holes 401. The outer walls of the outer corner plates 5 are all provided with outer through holes 6, and the outer corner plates 5 are slidably connected to the outer through holes 6. The steel arch support structure also includes multiple pads 11, and anti-slip plates 12 are fixedly connected to both sides of the pads 11. The outer walls of the pads 11 and the anti-slip plates 12 are all provided with second mounting holes 13. The third bolt fasteners 16 fix the inner corner plates 4 and outer corner plates 5 at the same end of the arch frame component 1 through the second mounting holes 13, and fix the inner corner plates 4 and outer corner plates 5 at the same end of the arch frame component 2.

[0029] The anti-slip plates 12 on both sides of the pad 11 increase the friction between the inner corner plate 4 and the outer corner plate 5 and the bolts and components, preventing the bolts from loosening due to vibration of the hole. The pad 11 can distribute the pressure of the bolts not aligning with the plate, prevent the corner plate from being deformed locally due to bolt compression, and extend the service life of the corner plate. At the same time, the elastic deformation of the anti-slip plate 12 can buffer part of the vibration load, further improving the stability of the connection node.

[0030] The first bolt fastener 14, the second bolt fastener 15, and the third bolt fastener 16 are each composed of bolts and nuts. They are fixed by the locking force of the bolts and nuts, thereby fixing the inner support plate 9 and the outer support plate 10 to the arch frame component 1 and the arch frame component 2, fixing the inner corner plate 4 and the outer corner plate 5 to each other, fixing the two inner corner plates 4 to each other, and fixing the two outer corner plates 5 to each other. This connection method is existing technology and will not be described in detail here.

[0031] Working principle: First, align both ends of arch frame component 1 with one end of each of the two arch frame components 2, so that the inner corner plates 4 and outer corner plates 5 at both ends of arch frame component 1 are respectively attached to the inner corner plates 4 and outer corner plates 5 at one end of arch frame component 2. The third bolt fastener 16 passes through the second fixing holes 8 of the inner corner plates 4 and outer corner plates 5 to fix the inner corner plates 4 and outer corner plates 5 at the same end of arch frame component 1, and at the same time fix the inner corner plates 4 and outer corner plates 5 at the same end of arch frame component 2. The pad 11 and the anti-slip plates 12 on both sides are sleeved on the third bolt fastener 16 through the second mounting holes 13 to increase the friction of the corner plate connection surface and prevent the bolts from loosening.

[0032] Insert the inner support plate 9 between the inner corner plates 4 where the arch frame component 1 and the arch frame component 2 meet, so that its outer arc wall abuts against the inner wall of the arch frame component 1 and the arch frame component 2; insert the outer support plate 10 between the corresponding outer corner plates 5, so that its inner arc wall abuts against the outer wall of the arch frame component 1 and the arch frame component 2; and fix the inner support plate 9 and the outer support plate 10 onto the arch frame component by passing the first bolt fastener 14 through the connecting hole 3 of the arch frame component and the first mounting hole 1001 of the support plate.

[0033] By passing the second bolt fastener 15 through the first fixing hole 7 of the inner corner plate 4 and the outer corner plate 5, the inner corner plate 4 at the end of the arch frame component 1 and the inner corner plate 4 at the end of the arch frame component 2 are fixed, and the outer corner plates 5 of both are fixed at the same time, thus completing the complete splicing of the arch frame component 1 and the two arch frame components 2, forming an arch support structure that is adapted to the body of the venting hole.

[0034] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A steel arch support structure for excavating a venting tunnel, comprising an arch support component one (1), two arch support components two (2), two inner corner plates (4), and two outer corner plates (5), characterized in that: An inner corner plate (4) and an outer corner plate (5) are fixedly installed at both ends of the first arch structure component (1) and at one end of each of the two second arch structure components (2). The inner corner plates (4) and outer corner plates (5) at both ends of the first arch structure component (1) are fixed to each other. The inner corner plates (4) and outer corner plates (5) at one end of each of the two second arch structure components (2) are fixed to each other. The inner corner plates (4) at both ends of the first arch structure component (1) are fixed to each other. The outer corner plates (5) at both ends of the first arch structure component (1) are fixed to each other. The outer corner plates (5) at one end are fixed to each other. The outer corner plates (5) at both ends of the arch frame component one (1) and the outer corner plates (5) at one end of the arch frame component two (2) are slidably connected to an outer support plate (10). The inner corner plates (4) at both ends of the arch frame component one (1) and the inner corner plates (4) at one end of the arch frame component two (2) are slidably connected to an inner support plate (9). The outer arc wall of the inner support plate (9) abuts against the arch frame component one (1) and the arch frame component two (2). The inner arc wall of the outer support plate (10) abuts against the arch frame component one (1) and the arch frame component two (2).

2. The steel arch support structure for excavating the venting tunnel as described in claim 1, characterized in that: The arch frame component one (1) and the arch frame component two (2) are combined to form an arch structure, and the cross-sections of the arch frame component one (1) and the arch frame component two (2) are both I-shaped.

3. The steel arch support structure for excavating the venting tunnel as described in claim 2, characterized in that: It also includes multiple first bolt fasteners (14), the outer walls of the arch structure component one (1) and the arch structure component two (2) are provided with connection holes (3), the outer walls of the inner support plate (9) and the outer support plate (10) are provided with first mounting holes (1001), the first bolt fasteners (14) fix the inner support plate (9) to the outer walls of the arch structure component one (1) and the arch structure component two (2) through the connection holes (3) and the first mounting holes (1001 respectively, and fix the outer support plate (10) to the outer walls of the arch structure component one (1) and the arch structure component two (2).

4. The steel arch support structure for excavating the venting tunnel as described in claim 3, characterized in that: The inner corner plate (4) and the outer corner plate (5) are provided with a first fixing hole (7). A second bolt fastener (15) is installed in the first fixing hole (7). The inner corner plate (4) at the end of the arch frame component one (1) and the end of the arch frame component two (2) are fixed to each other by the second bolt fastener (15), and the two outer corner plates (5) at the end of the arch frame component one (1) and the end of the arch frame component two (2) are fixed to each other.

5. The steel arch support structure for excavating the venting tunnel as described in claim 4, characterized in that: The inner corner plate (4) and the outer corner plate (5) are both provided with a second fixing hole (8). A third bolt fastener (16) is installed in the second fixing hole (8), and the inner corner plate (4) and the outer corner plate (5) at the same end of the arch frame component (1) are fixed to each other by the third bolt fastener (16).

6. The steel arch support structure for excavating the venting tunnel as described in claim 5, characterized in that: The inner corner plate (4) has an inner perforation (401) on its outer wall, and the inner corner plate (4) is slidably connected to the inner perforation (401).

7. The steel arch support structure for excavating the venting tunnel as described in claim 6, characterized in that: The outer corner plate (5) is provided with an external perforation (6) on its outer wall, and the outer corner plate (5) is slidably connected to the external perforation (6).

8. The steel arch support structure for excavating the venting tunnel as described in claim 7, characterized in that: It also includes multiple pads (11), each of which is fixedly connected with anti-slip plates (12). The outer walls of the pads (11) and anti-slip plates (12) are provided with second mounting holes (13). The third bolt fastener (16) fixes the inner corner plate (4) and outer corner plate (5) of the same end of the arch frame component one (1) to each other through the second mounting holes (13), and fixes the inner corner plate (4) and outer corner plate (5) of the same end of the arch frame component two (2) to each other.

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