CN211549705U

CN211549705U - Tunnel headwall structure

Info

Publication number: CN211549705U
Application number: CN201922278470.5U
Authority: CN
Inventors: 王新泉; 刁红国
Original assignee: Zhejiang University City College ZUCC
Current assignee: Zhejiang University City College ZUCC
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-09-22
Anticipated expiration: 2029-12-18

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 headwall structure

Technical Field

The utility model relates to a tunnel construction technical field especially relates to a tunnel headwall structure.

Background

The headwall is located the both sides of tunnel access & exit, plays the effect of retaining soil and water conservancy diversion, can guarantee the stability of road bed and embankment. In order to stabilize the tunnel portal early, the construction of the tunnel should be arranged as early as possible after the tunnel entering construction is normal. However, the traditional end wall is often complicated in geology and soft in bedrock, so that the end wall engineering excavation volume is large, the foundation is easy to settle and is damaged, and the effects of enhancing stability of the hole and ensuring safety of the hole cannot be effectively achieved.

Therefore, it is important to find a tunnel headwall structure which is safe, stable, small in excavation amount, capable of overcoming foundation settlement and suitable for being constructed on a soft rock base layer.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming not enough among the prior art, providing a tunnel headwall structure.

The tunnel end wall structure comprises a catch basin, an end wall, a bottom supporting plate, an anchoring pile, a pile tip, a side slope, a wing wall, a cover arch, an inverted arch filling surface, an inverted arch, a tunnel surface, an inverted slope, an anchor rod, an end wall reinforcing mesh and a reinforcing steel bar protection 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; a bottom supporting plate is arranged at the bottom of the end wall, 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 end wall reinforcing mesh is an inner-layer reinforcing mesh and an outer-layer reinforcing mesh, is arranged in a trapezoidal structure, and is externally provided with a reinforcing bar protective layer; one end of the anchor rod is inserted into the rock surface on the rear side of the end wall in a downward inclined mode, and the other end of the anchor rod is connected with the end wall reinforcing mesh.

Preferably, the method comprises the following steps: the cross section of the end wall is trapezoidal.

Preferably, the method comprises the following steps: the anchor rods are arranged in a quincunx shape, the exposed rock surface of each anchor rod 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 supporting plate.

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.

Drawings

FIG. 1 is a diagram of a tunnel headwall structure arrangement;

FIG. 2 is a cross-sectional end wall view;

fig. 3 is a schematic view of the arrangement of the reinforcing bars on the front surface of the end wall.

Description of reference numerals: 1-intercepting drain; 2-end wall; 3-bottom pallet; 4-anchor pile; 5-pile tip; 6-side slope; 7-wing wall; 8-arch sheathing; 9-inverted arch filling surface; 10-inverted arch; 11-face of the palm; 12-upward slope; 13-anchor rod; 14-end wall reinforcing mesh; and 15, a reinforcing steel bar protective layer.

Detailed Description

The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

The tunnel end wall structure comprises a catch basin 1, an end wall 2, a bottom supporting plate 3, an anchoring 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 at the lower parts of the side slopes 6 on two sides of a tunnel opening; 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; the bottom of the end wall 2 is provided with a bottom supporting plate 3, an anchoring pile 4 is arranged below the bottom supporting plate 3, and the bottom end of the anchoring pile 4 is provided with a pile tip 5; 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 at the back 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.

The section of the end wall 2 is trapezoidal.

The anchor rods 13 are arranged in a quincunx shape, the anchor rods 13 expose 30-40cm of rock surface and are welded with the reinforcing steel bar protection layer 15, and the reinforcing steel bar protection layer 15 is bound and connected with a reinforcing steel bar joint reserved on the bottom supporting plate 3.

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

firstly, as shown in figure 1, before the construction of the tunnel portal, the construction of the intercepting ditch 1 at the tunnel roof is carried out, the intercepting ditch 1 is arranged out of 1210 meters of the upward slope of the tunnel roof, and the construction of the intercepting ditch 1 is carried out before rainy season, so that the smooth drainage is ensured.

And secondly, excavating the back slope body of the end wall 2 according to design requirements, measuring and setting off before excavating, wherein the slope ratio of the back slope body to the end wall 2 is 1:1, and the slope of the end wall 2 is 1: 0.1, brushing the wing wall 7 after the hole door slope is brushed, wherein the slope ratio is 1: 0.2, the slope ratio of the side slope 6 at the upper part of the wing wall 7 is 1: 1; and then, measuring and setting out according to a construction drawing, excavating a foundation pit of the end wall 2 by using an excavator until the excavation is 10cm below a designed elevation, then manually leveling, excavating the anchoring pile 4 until the pile tip 5 enters the stable foundation layer for at least 1m, and pouring a bottom supporting plate 3 of reinforced concrete at the top end of the anchoring pile 4 to serve as an end wall foundation.

Thirdly, arranging the anchor rods 13 in a quincunx shape, inserting the anchor rods 12 into the rock surface on the rear side of the end wall 2 in a downward inclined mode, and exposing the rock surface of the anchor rods 13 by 30-40cm as shown in figure 2.

Fourthly, as shown in fig. 2, the bottom supporting plate 3 is reserved with steel bar joints, steel bars of the end wall 2 are lapped, end wall steel bar meshes 14 are bound, the end wall steel bar meshes 14 are welded with the exposed ends of the anchor rods 12, then a formwork is erected, and concrete pouring is carried out on the end wall 2 after the formwork is firmly reinforced. And when the concrete strength of the end wall 2 reaches a certain degree, removing the formwork and timely watering and maintaining.

Claims

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).