Combined supporting structure for underground tunnel

Abstract

The utility model discloses a combined supporting structure for an underground tunnel, and belongs to the technical field of tunnel supporting. The supporting structure comprises a steel arch frame, and a combined arch frame is formed by three trusses as a group and is arranged at an underground tunnel portal and used for supporting the tunnel portal; the concrete foundation block is arranged on the ground of the tunnel portal and used for supporting the combined arch frame; the erecting steel plate is welded on an arch foot of the combined arch frame; the connecting batten plates are welded to the inner wall face and the outer wall face of the combined arch frame at equal intervals. Wherein the number of the combined arch frames is two, the combined arch frames are erected at the intersection position of an underground tunnel portal, and the straight cross beam is erected between the two combined arch frames. According to the combined arch frame, the number of arch feet of the combined arch frame erected at the tunnel intersection can be reduced, so that the space at the position of the tunnel intersection does not affect traffic driving or water drainage. The two groups of combined arch frames are matched with the straight cross beams to be erected at the tunnel intersection, so that more vertical supporting columns do not need to be erected at the middle position of the intersection.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of underground tunnel combined support structure, belong to tunnel support technical field. BACKGROUND

[0002] China mountainous area is vast, when carrying out road, water conservancy and hydropower engineering construction, it is unavoidable to involve many underground tunnel engineering construction.In tunnel construction, tunnel support construction is one of important component links, and is the powerful guarantee for ensuring tunnel construction safety.

[0003] In specific construction link, if the tunnel surrounding rock geological condition needed to support is poor, multiple steel arches need to be added at tunnel portal to support, in conventional arrangement, since there are many steel arches, its arch foot and arch leg are easy to encroach tunnel space, thereby affecting normal traffic driving or water release. UTILITARY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide a kind of underground tunnel combined support structure, which solves the problem of multiple arch feet and arch legs when multiple steel arches are used for support in the prior art.

[0005] The technical problem to be solved by the utility model is solved by the following technical scheme: a kind of underground tunnel combined support structure, comprising: steel arch, three pieces of a group constitute combined arch and are arranged at underground tunnel portal, for supporting tunnel portal;Concrete foundation block, arranged at tunnel portal ground, for supporting combined arch;Frame steel plate, welded on the arch foot of combined arch;Several connecting plates, equidistantly welded on the inner and outer wall surface of combined arch;Wherein, combined arch is two groups, respectively erected at the intersection position of underground tunnel portal, flat cross beam is arranged between the two groups of combined arch, and flat cross beam is used to support the top of tunnel.

[0006] By adopting the above technical scheme, the number of arch feet of combined arch erected at tunnel intersection can be reduced, so that the space at the intersection position of tunnel does not affect traffic driving or water release. By erecting two groups of combined arches and flat cross beams at the intersection of tunnel, the middle position of intersection does not need to build more vertical support columns, which can make the available space of tunnel intersection larger under the premise of ensuring that the support strength of tunnel portal is sufficient, thereby facilitating subsequent traffic driving at tunnel portal.

[0007] The utility model is further provided as follows: the steel arch is U-shaped as a whole, and the cross section is I-shaped, and in the combined arch, each steel arch support is provided with a gap.

[0008] By adopting the technical scheme, the U-shaped steel arch is used for adapting to the arc-shaped top surface of the tunnel portal top, and the straight horizontal beam is arranged in the gap between the tunnel portal top and the combined arch, so that the supporting strength of the supporting structure on the whole tunnel portal can be further improved.

[0009] The utility model further sets up: two mounting holes are formed on the connecting patch plate, and a fixing assembly is arranged in the mounting hole.

[0010] By adopting the technical scheme, the connecting patch plate is fixed on the predetermined position of the combined arch through the fixing assembly, so that the welding position can be accurately found when the construction personnel welds the connecting patch plate, the connecting patch plate does not need to be assisted by the hoisting device during welding, the connecting patch plate can be fixed on the combined arch at one time, and then subsequent welding is carried out, and the welding process of the connecting patch plate is simplified.

[0011] The utility model further sets up: the fixing assembly comprises a clamping block, a bolt is threadedly connected to the clamping block, an abutting piece is slidably arranged between the nut and the head of the bolt, the abutting piece is used for sealing the mounting hole, the clamping block is clamped between the two steel arches in the combined arch, and the connecting patch plate is arranged between the abutting piece and the outer wall surface of the connecting arch.

[0012] By adopting the technical scheme, the connecting patch plate can be stably fixed on the combined arch, the clamping block is clamped between the two steel arches, and the abutting piece seals the mounting hole, so that the internal part of the fixing assembly is protected from external factors.

[0013] The utility model further sets up: the fixing assembly further comprises a sliding block slidably arranged in the clamping block, the number of the sliding blocks is two, an inclined surface is arranged on the opposite side of the two sliding blocks, a push plate is arranged between the two inclined surfaces, and the push plate is rotatably connected to the head of the bolt.

[0014] By adopting the technical scheme, the sliding block can be clamped between the two steel arches on the two sides of the clamping block after sliding to the two sides of the clamping block, so that the connection between the clamping block and the steel arch is more compact. When the fixing assembly is installed, the clamping block is first inserted into the gap between the two steel arches, the bolt is rotated into the clamping block by rotating the bolt, the push plate is pushed, the sliding block is pushed to the outside of the clamping block, the sliding block abuts against the inner wall surface of the steel arch, and the problem that the sliding block interferes when rotating after being inserted between the two steel arches is avoided, so that the connection between the clamping block and the steel arch is more compact.

[0015] The utility model further sets up: a spring is arranged between the sliding block and the clamping block, and the spring applies a force to the sliding block to slide to the inside of the clamping block.

[0016] By adopting the technical scheme, the sliding block can be automatically retracted in the inner part of the clamping block in the state of not being subjected to external force.

[0017] The utility model further sets up: the steel mesh is laid when the concrete foundation block is poured.

[0018] By adopting the technical scheme, the steel mesh and the concrete are combined to form a composite structure, and the bearing capacity of the concrete foundation block is significantly improved. The steel mesh can bear tension, and the concrete mainly bears pressure, and the two complement each other to improve the strength and stability of the overall structure.

[0019] The utility model has the advantages of:

[0020] The multiple steel arches are spliced into the combined arches to support the tunnel entrance, the supporting strength of the steel arches on the tunnel entrance is significantly increased, the combined arches are erected at the tunnel intersection, and the straight cross beams are arranged between the two combined arches, so that the top of the tunnel is effectively supported. Meanwhile, the combined arches are arranged between the two combined arches, so that the vertical support column is not arranged at the middle position of the tunnel intersection, the space of the tunnel intersection is larger, and the influence of the vertical support column on the road layout during subsequent traffic is avoided.

[0021] The connecting plate is welded on the combined arch, and the supporting strength of the combined arch is further improved.

[0022] The fixing assembly is used for assisting the installation of the connecting plate, the installation process of the connecting plate is simplified, the connecting plate can be hoisted by the hoisting equipment in one time, and then the connecting plate is fixed on the predetermined position of the combined arch through the fixing assembly, the connecting plate does not need to be hoisted through the hoisting equipment in real time during welding, and the connecting strength between the connecting plate and the combined arch is further improved through the fixing assembly. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional structure schematic view of a single combined arch of the utility model;

[0024] Figure 2 It is a plan view when two combined arches of the utility model are overlapped;

[0025] Figure 3 It is an arch foot cross section schematic view of the combined arch of the utility model;

[0026] Figure 4 It is a three-dimensional structure schematic view of a fixing assembly of the utility model;

[0027] Figure 5 It is a front view of the fixing assembly in the retracted state of the sliding block of the utility model; It is a front view of the fixing assembly in the retracted state of the sliding block of the utility model;

[0028] Figure 6 This is a front view of the fixed component of the present invention in the extended state of the sliding block.

[0029] In the diagram: 1. Steel arch frame; 2. Concrete foundation block; 3. Erecting steel plate; 4. Connecting plate; 401. Mounting hole; 5. Straight crossbeam; 6. Fixing component; 601. Clip; 602. Bolt; 6021. Nut; 6022. Screw head; 603. Abutment part; 604. Sliding block; 605. Inclined surface; 606. Push plate; 607. Spring; 7. Combined arch frame. Detailed Implementation

[0030] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this utility model, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0031] like Figures 1-3 As shown, a combined support structure for underground tunnels includes steel arch frames, with three arch frames forming a combined arch. Figures 1-3 As shown, a combined support structure for an underground tunnel includes a steel arch frame 1, with three arch frames forming a combined arch frame 7, which is installed at the entrance of the underground tunnel to support the tunnel entrance; a concrete foundation block 2, which is installed on the ground at the tunnel entrance to support the combined arch frame 7; a steel plate 3, which is welded to the arch foot of the combined arch frame 7; and several connecting plates 4, which are welded at equal intervals to the inner and outer walls of the combined arch frame 7. There are two sets of combined arch frames 7, which are respectively installed at the intersection of the underground tunnel entrances. A straight crossbeam 5 is erected between the two sets of combined arch frames 7 to support the top of the tunnel.

[0032] After the tunnel entrance is excavated, concrete foundation blocks 2 are laid at the tunnel intersection. Simultaneously with the pouring of concrete foundation blocks 2, a combined arch frame 7 is assembled. Steel plates 3 are welded to the arch feet of the combined arch frame 7. After the concrete foundation blocks 2 have completely solidified, the assembled combined arch frame 7 is moved onto the concrete foundation blocks 2, with the steel plates 3 fitting snugly against the concrete foundation blocks 2, increasing the contact area between the combined arch frame 7 and the concrete foundation blocks 2, making the fixing of the combined steel plates more stable. During the erection of the combined arch frame 7, a gap is reserved between the combined arch frame 7 and the top of the tunnel entrance for laying straight crossbeams 5. The straight crossbeams 5 are placed in the gap and connected to the two combined arch frames 7 erected at the tunnel intersection by welding, thus effectively supporting the tunnel roof above the tunnel intersection. Simultaneously, connecting plates 4 are welded to the inner and outer walls of the combined arch frame 7, further improving the support strength of the entire combined arch frame 7.

[0033] Further, the steel arch 1 is U-shaped as a whole, and the cross section is H-shaped. In the combined arch 7, a gap is reserved for each steel arch 1 support. The U-shaped steel arch 1 is used to adapt to the arc-shaped top surface of the tunnel portal top, so that the combined arch 7 is more closely fitted with the tunnel top, and the supporting strength is higher.

[0034] Further, the concrete foundation block 2 is laid with a steel mesh during pouring. The combination of the steel mesh and the concrete forms a composite structure, which significantly improves the carrying capacity of the concrete foundation block 2.

[0035] In an embodiment, as shown in Figure 1 and Figure 3 , two mounting holes 401 are provided on the connecting plate 4, and a fixing assembly 6 is arranged in the mounting hole 401. The fixing assembly 6 is used to pre-fix the connecting plate 4.

[0036] Specifically, as shown in Figures 4-6 , the fixing assembly 6 includes a clamping block 601, a bolt 602 is threadedly connected to the clamping block 601, and an abutting piece 603 is slidingly arranged between the nut 6021 and the head 6022 of the bolt 602. The abutting piece 603 is used to seal the mounting hole 401. The clamping block 601 is clamped between two steel arches 1 in the combined arch 7, and the connecting plate 4 is arranged between the abutting piece 603 and the outer wall surface of the connecting arch. By rotating the bolt 602, the abutting piece 603 clamps the connecting plate 4 at a predetermined position on the combined arch 7.

[0037] By fixing the connecting plate 4 at a predetermined position on the combined arch 7 through the fixing assembly 6, the construction personnel can accurately find the welding position when welding the connecting plate 4. The connecting plate 4 can be fixed on the combined arch 7 at one time, and then the subsequent welding is carried out, which simplifies the welding process of the connecting plate 4.

[0038] In the embodiment, the fixing assembly 6 further includes a sliding block 604 slidingly arranged in the clamping block 601. The number of sliding blocks 604 is two, and the opposite side of the two sliding blocks 604 is provided with an inclined surface 605. The two inclined surfaces 605 are provided with a push plate 606, and the push plate 606 is rotationally connected to the head 6022 of the bolt 602. A spring 607 is arranged between the sliding block 604 and the clamping block 601. The spring 607 applies a force to the sliding block 604 to slide into the clamping block 601, so that the sliding block 604 automatically retracts into the clamping block 601 without external force.

[0039] The sliding block 604 can be clamped between the two steel arches 1 on both sides of the clamping block 601 after sliding to both sides of the clamping block 601, so that the connection between the clamping block 601 and the steel arch 1 is more compact. When the fixing assembly 6 is installed, the clamping block 601 is first inserted from the gap between the two steel arches 1, then the bolt 602 is rotated to the inside of the clamping block 601, and the push plate 606 is pushed, the push plate 606 pushes the sliding block 604 to slide to the outside of the clamping block 601, so that the sliding block 604 abuts against the inner wall surface of the steel arch 1, thereby avoiding the problem of interference when the sliding block 604 is rotated after being inserted between the two steel arches 1, and the connection between the clamping block 601 and the steel arch 1 is more compact.

[0040] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above embodiments, and various changes and improvements can be made without departing from the spirit and scope of the present application. These changes and improvements are all within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A combined support structure for an underground tunnel, characterized in that The utility model relates to a tunnel portal support structure, comprising: a steel arch (1) which is arranged at the tunnel portal and is used for supporting the tunnel portal; a concrete foundation block (2) which is arranged on the ground of the tunnel portal and is used for supporting the steel arch (1); a steel plate (3) which is welded to the arch foot of the steel arch (1); a plurality of connecting plates (4) which are welded to the inner and outer walls of the steel arch (1) at equal intervals; wherein the steel arch (1) is in the shape of a U and has a cross-section in the shape of an I, and a gap is reserved in each steel arch (1) for the steel plate (3); 2. A combined support structure for an underground tunnel according to claim 1, characterized in that: the connecting plate (4) is provided with two mounting holes (401) at the beginning, and a fixing assembly (6) is arranged in the mounting hole (401), which is used for pre-fixing the connecting plate (4).

3. A combined support structure for an underground tunnel according to claim 1, characterized in that: the fixing assembly (6) comprises a clamping block (601), a bolt (602) is threadedly connected to the clamping block (601), a abutting piece (603) is slidably arranged between the nut (6021) and the screw head (6022) of the bolt (602), the abutting piece (603) is used for sealing the mounting hole (401), the clamping block (601) is clamped between two steel arches (1) in the joint arch (7), the connecting plate (4) is arranged between the abutting piece (603) and the outer wall of the joint arch, and the connecting plate (4) is clamped at a predetermined position on the joint arch (7) by rotating the bolt (602).

4. A combined support structure for an underground tunnel according to claim 3, wherein: the fixing assembly (6) further comprises a sliding block (604) which is slidably arranged in the clamping block (601), the number of the sliding block (604) is two, the opposite side of the two sliding blocks (604) is provided with an inclined surface (605), and a push plate (606) is arranged between the two inclined surfaces (605), and the push plate (606) is rotatably connected to the screw head (6022) of the bolt (602).

5. A combined support structure for an underground tunnel according to claim 4, wherein: a spring (607) is arranged between the sliding block (604) and the clamping block (601), and the spring (607) applies a force to the sliding block (604) to slide towards the inside of the clamping block (601).

6. A combined support structure for an underground tunnel according to claim 5, wherein: the concrete foundation block (2) is laid with a steel mesh during pouring.

7. A combined support structure for an underground tunnel according to claim 1, characterized in that: ​

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