CN211549705U - Tunnel headwall structure - Google Patents

Abstract

The utility model relates to a tunnel headwall structure, which comprises a catch basin, headwalls, a bottom supporting plate, anchoring piles, side slopes, wing walls, cover arches, an inverted arch filling surface, inverted arches, inverted slopes, anchor rods, headwall reinforcing mesh and a reinforcing protective layer; the intercepting ditches are arranged on slope bodies outside a side slope and an upward slope excavation line, and the wing walls are arranged below the side slopes on two sides of the tunnel portal; the sleeve arch is arranged at the tunnel face opening of the tunnel, the bottom of the sleeve arch is provided with an inverted arch, the periphery of the sleeve arch is provided with an end wall, and an inverted slope is arranged at the top of the end wall; the inverted arch filling surface is arranged above the inverted arch; the bottom of the end wall is provided with a bottom supporting plate, an anchoring pile is arranged below the bottom supporting plate, and a pile tip is arranged at the bottom end of the anchoring pile. The utility model has the advantages that: the utility model discloses a lower thick trapezoidal headwall that thin from top to bottom, and the bottom sets up bottom plate and anchor pile and is used for supporting the headwall, not only reduces headwall basis excavation degree of depth, and can avoid soft basic unit to cause the headwall to subside destruction, and the reinforcing entrance to a cave is stable, guarantees entrance to a cave safety.

Description

Tunnel end wall structure

technical field

The utility model relates to the technical field of tunnel construction, in particular to a tunnel end wall structure.

Background technique

The end walls are located on both sides of the tunnel entrance and exit, and play the role of soil retention and diversion, which can ensure the stability of the roadbed and embankment. In order to stabilize the tunnel entrance as soon as possible, the construction should be arranged as soon as possible after the tunnel enters the tunnel normally. However, the traditional end wall is often damaged due to the complex geology and soft bedrock, resulting in a large amount of excavation and easy settlement of the end wall project, which cannot effectively enhance the stability of the opening and ensure the safety of the opening.

Therefore, it is very important to find a safe and stable tunnel end wall structure that can overcome the foundation settlement and adapt to the construction on the soft rock base with a small amount of excavation.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a tunnel end wall structure.

This tunnel end wall structure includes intercepting ditch, end wall, bottom plate, anchoring pile, pile tip, side slope, wing wall, sleeve arch, inverted arch filling surface, inverted arch, face, inverted slope, anchor Rod, end wall steel mesh and steel protection layer; the intercepting ditch is arranged on the outer slope body of the side slope and the inverted slope excavation line, and the wing wall is arranged under the slope on both sides of the tunnel opening; the set of arches Be arranged at the opening of the face of the tunnel, the bottom of the set arch is set with an inverted arch, the periphery of the set of arches is set with an end wall, and the inverted slope is set on the top of the end wall; the inverted arch filling surface is set on the top of the inverted arch; the bottom of the end wall is set with a bottom Supporting plate, anchoring piles are arranged below the bottom supporting plate, and pile tips are arranged at the bottom of the anchoring piles; layer; one end of the anchor rod is inserted into the rock face on the rear side of the end wall obliquely downward, and the other end is connected with the reinforcing mesh of the end wall.

As a preference: the section of the end wall is a trapezoid.

Preferably, the anchor rods are arranged in a plum blossom shape, the exposed rock face of the anchor rods is 30-40cm and is welded with the steel bar protection layer, and the steel bar protection layer is bound and connected with the steel bar joints reserved on the bottom support plate.

The beneficial effects of the utility model are: the trapezoidal end wall is designed with a thick bottom and a thin top, and the bottom is provided with a bottom support plate and an anchoring pile to support the end wall, which not only reduces the excavation depth of the end wall foundation, but also avoids softness. The base layer causes settlement damage to the end wall, enhances the stability of the opening, and ensures the safety of the opening.

Description of drawings

Fig. 1 is the structural arrangement diagram of the tunnel end wall;

Figure 2 is a cross-sectional view of an end wall;

Figure 3 is a schematic diagram of the front reinforcement arrangement of the end wall.

Description of reference numerals: 1—intercepting ditch; 2—end wall; 3—bottom plate; 4—anchoring pile; 5—pile tip; 6—slope; 7—wing wall; 8 - set arch; 9 - filling surface of inverted arch; 10 - inverted arch; 11 - face of face; 12 - inverted slope; 13 - anchor rod; 14 - end wall steel mesh; 15 - steel bar The protective layer.

Detailed ways

The present utility model will be further described below in conjunction with the embodiments. The descriptions of the following embodiments are only used to assist the understanding of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present utility model, some improvements and modifications can also be made to the present utility model, and these improvements and modifications also fall into the protection of the claims of the present utility model. within the range.

Described tunnel end wall structure, including intercepting ditch 1, end wall 2, bottom support plate 3, anchoring pile 4, pile tip 5, side slope 6, wing wall 7, sleeve arch 8, inverted arch filling surface 9, inverted arch Arch 10, face 11, inclined slope 12, anchor rod 13, end wall steel mesh 14 and steel protective layer 15; the intercepting ditch 1 is arranged on the slope body on the outside of the excavation line of the side slope 6 and the inclined slope 12, Described wing wall 7 is arranged at the lower part of side slope 6 on both sides of the tunnel opening; described sleeve arch 8 is arranged at the opening of the tunnel face 11, the bottom of sleeve arch 8 is provided with inverted arch 10, and the periphery of sleeve arch 8 is provided with end wall 2, The inverted slope 12 is arranged on the top of the end wall 2; the inverted arch filling surface 9 is arranged above the inverted arch 10; The bottom end of the anchoring pile 4 is provided with a pile tip 5; the end wall reinforcement mesh 14 is an inner and outer double-layer reinforcement mesh, and is arranged in a trapezoidal structure, and a reinforcement protection layer 15 is provided outside the end wall reinforcement mesh 14; one end of the anchor rod 13 is downward It is inserted obliquely into the rock face on the back side of the end wall 2 , and the other end is connected with the reinforcing mesh 14 of the end wall.

The section of the end wall 2 is trapezoidal.

The anchor rods 13 are arranged in a plum blossom shape. The anchor rods 13 are exposed to a rock face by 30-40 cm and are welded to the steel bar protection layer 15 .

The construction method of the tunnel end wall structure comprises the following steps:

The first step, as shown in Figure 1, is to carry out the construction of the intercepting ditch 1 on the top of the tunnel before the construction of the tunnel door. Construction to ensure smooth drainage.

The second step: excavate the slope behind the end wall 2 according to the design requirements. Before excavation, measure and set out the line. The slope ratio of the 12 slopes is 1:1, the slope of the end wall 2 is 1:0.1, and the slope of the cave door is brushed. After brushing the wing wall 7, the slope ratio is 1:0.2, and the slope ratio of the upper side slope 6 of the wing wall 7 is 1:1; then measure the line according to the construction drawings, and excavate the foundation pit of the end wall 2 by the excavator, and excavate to the design. 10cm below the elevation, then artificially leveling, driving anchor piles 4 until the pile tip 5 enters the stable bedrock layer at least 1m deep, and pouring a reinforced concrete bottom plate 3 on the top of the anchor pile 4 as the end wall foundation.

The third step is to arrange the bolts 13 in a plum blossom shape, and insert the bolts 12 into the rock face on the rear side of the end wall 2 obliquely downward, and the bolts 13 are exposed to the rock face by 30-40cm, as shown in FIG. 2 .

The fourth step, as shown in Figure 2, the bottom support plate 3 reserves steel bar joints, overlaps the steel bars of the end wall 2, binds the end wall steel mesh 14, and welds the end wall steel mesh 14 and the exposed end of the anchor rod 12, and then The vertical formwork is reinforced and the end wall 2 concrete is poured after the formwork is firmly reinforced. When the concrete strength of the end wall 2 reaches a certain level, the formwork shall be removed and watering maintenance shall be carried out in time.

Claims (3)

1. A tunnel headwall structure which characterized in that: the anchor pile comprises a catch basin (1), an end wall (2), a bottom supporting plate (3), an anchor pile (4), a pile tip (5), a side slope (6), a wing wall (7), a cover arch (8), an inverted arch filling surface (9), an inverted arch (10), a tunnel face (11), an inverted slope (12), an anchor rod (13), an end wall reinforcing mesh (14) and a reinforcing steel bar protection layer (15); the intercepting ditch (1) is arranged on a slope body outside an excavation line of a side slope (6) and an upward slope (12), and the wing walls (7) are arranged below the side slopes (6) on two sides of the tunnel portal; the sleeve arch (8) is arranged at the opening of a tunnel face (11) of the tunnel, the inverted arch (10) is arranged at the bottom of the sleeve arch (8), the end wall (2) is arranged on the periphery of the sleeve arch (8), and the inverted slope (12) is arranged at the top of the end wall (2); the inverted arch filling surface (9) is arranged above the inverted arch (10); a bottom supporting plate (3) is arranged at the bottom of the end wall (2), an anchoring pile (4) is arranged below the bottom supporting plate (3), and a pile tip (5) is arranged at the bottom end of the anchoring pile (4); the end wall reinforcing mesh (14) is an inner and outer double-layer reinforcing mesh and is arranged in a trapezoidal structure, and a reinforcing protective layer (15) is arranged outside the end wall reinforcing mesh (14); one end of the anchor rod (13) is inserted into the rock surface on the rear side of the end wall (2) in a downward inclined mode, and the other end of the anchor rod is connected with the end wall reinforcing mesh (14).

2. The tunnel headwall structure of claim 1, wherein: the section of the end wall (2) is trapezoidal.

3. The tunnel headwall structure of claim 1, wherein: the anchor rods (13) are arranged in a quincunx shape, the exposed rock surface of the anchor rods (13) is 30-40cm and is welded with the reinforcing steel bar protective layer (15), and the reinforcing steel bar protective layer (15) is bound and connected with a reinforcing steel bar joint reserved on the bottom supporting plate (3).

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