Collapsible loess tunnel guide wall structure

Abstract

The utility model belongs to the technical field of tunnel construction, and particularly relates to a collapsible loess tunnel guide wall structure. Comprising a guide wall, an expanded arch springing is arranged at an arch springing position of the guide wall, a concrete arch springing foundation is arranged at the bottom of the expanded arch springing, the expanded arch springing and the concrete arch springing foundation are connected with a grouting steel floral pipe pile below the expanded arch springing and the concrete arch springing foundation, the grouting steel floral pipe pile is transversely located outside a tunnel contour line, and the lower end of the grouting steel floral pipe pile is located below the tunnel contour line; by arranging the expanded arch springing, the grouting steel flower pipe pile and the concrete arch springing foundation on the arch springing of the guide wall, the guide wall can be effectively prevented from being severely settled, the tunnel portal section is prevented from being subjected to structural invasion, a stable supporting structure is provided for tunnel holing, the post-processing cost is reduced, and the tunnel holing construction period is prevented from being influenced. Therefore, the structure is clear in stress system and high in safety, sedimentation of the guide wall can be effectively reduced, the tunnel construction technology is greatly enriched, and the structure has extremely wide popularization value.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tunnel construction technical field, concretely relates to a collapsible loess tunnel guide wall structure. BACKGROUND

[0002] Loess is widely distributed, collapsibility is an important characteristic of loess, when the soil is in a wet state, it is easy to become soft, and the bearing capacity of soil will decrease sharply. When building tunnels in loess areas, often face the problems of large tunnel settlement and collapse, which restricts the rapid development of loess tunnel construction technology. As the collapsibility of loess is easy to produce when it meets water, it is easy to lead to the settlement of guide wall and tunnel, and thus the structure intrusion phenomenon occurs, the treatment cost and expense are huge, such as large settlement of guide wall, which will seriously affect the tunnel construction and progress; therefore, it is necessary to solve the problem of large settlement of guide wall. CONTENT

[0003] The utility model discloses a collapsible loess tunnel guide wall structure.

[0004] The utility model provides the following technical scheme: a collapsible loess tunnel guide wall structure, including guide wall, the arch foot of guide wall is provided with the arch foot of expansion, the bottom of arch foot of expansion is provided with concrete arch foot foundation, and the arch foot of expansion and concrete arch foot foundation are connected with the grouting steel flower pipe pile below, the grouting steel flower pipe pile is transversely located outside the tunnel contour line, and the lower end of grouting steel flower pipe pile is below the tunnel contour line.

[0005] Further, the I-shaped steel support is arranged in the arch foot of expansion, and the I-shaped steel support is welded with the steel arch frame in the grouting steel flower pipe pile and the guide wall.

[0006] Further, the I-shaped steel support includes an I-shaped steel beam and an I-shaped steel beam inclined brace, the I-shaped steel beam is horizontally welded to the end of the steel arch frame, and the I-shaped steel beam inclined brace is welded between the steel arch frame and the I-shaped steel beam.

[0007] Further, the concrete arch foot foundation is provided with a steel mesh arranged in layers from top to bottom.

[0008] Further, the upper end of the grouting steel flower pipe pile extends into the arch foot of expansion by 0.5m.

[0009] Further, the depth of the grouting steel flower pipe pile is 5-10m.

[0010] Further, the I-shaped steel support is connected with two steel arch frames in front of and behind the guide wall respectively, and the two I-shaped steel supports are welded with a steel bar.

[0011] Further, the width of the arch foot of expansion and the concrete arch foot foundation is 0.5-1m, and the total height of the two is 0.5-1m.

[0012] Compared with the prior art, the advantages of the utility model lie in that:

[0013] The tunnel guide wall structure of collapsible loess is provided with the expanded arch foot, the grouting steel flower pipe pile and the concrete arch foot foundation, which can effectively prevent the guide wall from having large settlement and prevent the tunnel portal section from having structure intrusion, provide a stable supporting structure for the tunnel portal, reduce the later treatment cost and avoid affecting the tunnel portal construction period. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a tunnel guide wall structure elevation schematic view;

[0015] Figure 2 It is a tunnel guide wall structure top view schematic view;

[0016] Figure 3 It is a tunnel guide wall structure section schematic view.

[0017] In the drawing: 1-guide wall; 2-expanded arch foot; 3-concrete arch foot foundation; 4-grouting steel flower pipe pile; 5-steel arch frame; 6-I-beam; 7-I-beam inclined brace; 8-reinforcing mesh; 9-guide pipe; 10-tunnel contour line; 11-reinforcing bar; 12-tunnel upward slope; 13-tunnel. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0019] As Figure 1 shown: a tunnel guide wall structure of collapsible loess, including guide wall 1, the arch foot of guide wall 1 is provided with expanded arch foot 2, the bottom of expanded arch foot 2 is provided with concrete arch foot foundation 3, expanded arch foot 2 and concrete arch foot foundation 3 are connected with grouting steel flower pipe pile 4 below, grouting steel flower pipe pile 4 is transversely located outside tunnel contour line, the lower end of grouting steel flower pipe pile 4 is below tunnel contour line. The upper end of grouting steel flower pipe pile 4 extends into expanded arch foot 2 by 0.5 meters. The depth of grouting steel flower pipe pile 4 is 5-10 meters.

[0020] Concrete arch foot foundation 3 is provided with reinforcing mesh 8 arranged in layers upwards and downwards.

[0021] The width of the enlarged arch foot 2 and the concrete arch foot foundation 3 is 0.5-1 meter, and the total height of the two is 0.5-1 meter.

[0022] As shown in Figure 2 The enlarged arch foot 2 is provided with an I-beam support, and the I-beam support is welded with the grouting steel flower pipe pile 4 and the steel arch support 5 in the guide wall 1. The I-beam support is connected with the front and rear two steel arch supports 5 in the guide wall 1 respectively, and the two I-beam supports are connected by welding the steel bars 11 therebetween. The I-beam support includes an I-beam cross beam 6 and an I-beam cross beam inclined strut 7, the I-beam cross beam 6 is horizontally welded at the end of the steel arch support 5, and the I-beam cross beam inclined strut 7 is welded between the steel arch support 5 and the I-beam cross beam 6.

[0023] The specific construction steps of the tunnel guide wall structure are as follows:

[0024] (1) When excavating to the bottom of the arch foot foundation of the guide wall 1, the arch foot is expanded, the width direction is expanded by 0.5-1 meter, and the depth is 1 meter below the arch foot elevation. After the excavation is completed, the artificial virtual soil at the bottom is cleaned up;

[0025] (2) The edge line of the guide wall 1, the position of the steel arch support 5 of the guide wall 1 and the center of the grouting steel flower pipe pile 4 are measured and laid out, and the grouting steel flower pipe pile 4 cannot intrude into the tunnel contour line;

[0026] (3) A Luoyang shovel or a down-the-hole drill is used to drill holes at the expanded arch foot position, the drilling depth is 5-10 meters or to the soil layer with good bearing capacity at the bottom; the number and length of the holes can be comprehensively judged according to the loess collapsibility test and the actual situation on site, and high-pressure air can be used to clean the holes after the drilling is completed;

[0027] (4) The steel flower pipe is installed, when the length is relatively long, the steel flower pipe can be installed in sections, the steel flower pipe is extended into the expanded arch foot 2 by 0.5 meters, and then the cement mortar is poured;

[0028] (5) The steel mesh 8 and the formwork are installed, and the arch foot foundation concrete is poured;

[0029] (6) The steel arch support 5 of the guide wall 1 and the I-beam support of the expanded arch foot 2 are installed, and the steel arch support 5 and the I-beam support, the I-beam support and the grouting steel flower pipe pile 4 are welded firmly, then the guide pipe 9 and the formwork are installed, and the guide wall concrete is poured.

[0030] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A collapsible loess tunnel guide wall structure, characterized in that: The utility model relates to a tunnel construction technology, including guide wall (1), the bottom of the arch spring of guide wall (1) is provided with the arch spring (2) of expansion, the bottom of arch spring (2) is provided with concrete arch spring foundation (3), arch spring (2) and concrete arch spring foundation (3) are connected with the grouting steel flower pipe pile (4) below, grouting steel flower pipe pile (4) is transversely located outside the tunnel contour line, the lower end of grouting steel flower pipe pile (4) is below the tunnel contour line.

2. The collapsible loess tunnel guide wall structure according to claim 1, characterized in that: The I-shaped steel support is arranged in the arch spring (2) and is welded with the steel arch frame (5) in the guide wall (1) and the grouting steel flower pipe pile (4).

3. The collapsible loess tunnel guide wall structure according to claim 2, characterized in that: The I-shaped steel support includes an I-shaped steel beam (6) and an I-shaped steel beam inclined strut (7), the I-shaped steel beam (6) is horizontally welded to the end of the steel arch frame (5), and the I-shaped steel beam inclined strut (7) is welded between the steel arch frame (5) and the I-shaped steel beam (6).

4. The collapsible loess tunnel guide wall structure according to claim 2, characterized in that: The concrete arch spring foundation (3) is provided with a steel mesh (8) arranged in layers from top to bottom.

5. The collapsible loess tunnel guide wall structure according to claim 1, characterized in that: The upper end of the grouting steel flower pipe pile (4) extends into the arch spring (2) by 0.5 m.

6. The collapsible loess tunnel guide wall structure according to claim 5, characterized in that: The grouting steel flower pipe pile (4) has a depth of 5-10 m.

7. The collapsible loess tunnel guide wall structure according to claim 2 or 3, characterized in that: The I-shaped steel support is connected with two steel arch frames (5) in front of and behind the guide wall (1) respectively, and steel bars (11) are welded between the two I-shaped steel supports.

8. The collapsible loess tunnel guide wall structure according to claim 1, characterized in that: The arch spring (2) and the concrete arch spring foundation (3) have a width of 0.5-1 m and a total height of 0.5-1 m.

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