Bamboo cutting type ecological tunnel portal structure of tunnel

Abstract

The utility model discloses a tunnel bamboo cutting type ecological tunnel portal structure which comprises a bamboo cutting type tunnel portal, an open cut tunnel and an open cut tunnel backfill structure, and the open cut tunnel backfill structure comprises a lower layer vegetation bag backfill structure and an upper layer vegetation bag backfill structure, the lower layer vegetation bag backfill structure and the upper layer vegetation bag backfill structure are sequentially arranged in the range of arch feet on the two sides of the open cut tunnel along the back of the bamboo cutting type tunnel portal, and the upper layer vegetation bag backfill structure is arranged in the range of an arch crown of the open cut tunnel. The bamboo cutting type tunnel portal is simple in structure and low in cost, the bamboo cutting type tunnel portal is greened by improving an open cut tunnel backfilling structure and adopting the scheme that the vegetation bags replace spray-seeding grass planting, the applicability of the bamboo cutting type tunnel portal in a large rainfall area can be greatly improved, water damage accidents of the slope face of the bamboo cutting type tunnel portal are reduced, and the service life of the bamboo cutting type tunnel portal is prolonged. And the reliability and stability of the bamboo cutting type tunnel portal are improved, the application range is wide, and good popularization prospects are achieved.

Description

Technical Field

[0001] The utility model relates to a tunnel bamboo-cutting ecological portal structure, belonging to the technical field of tunnel construction. Background Technique

[0002] As an important part of the tunnel structure, the form of the tunnel portal not only relates to the overall appearance of the tunnel, but also has an important impact on the safety, stability and durability of the tunnel. In actual engineering, the selection of the tunnel portal form should be comprehensively considered according to specific geological conditions, terrain environment, tunnel length, construction conditions and aesthetic requirements, etc., to ensure the safety, stability and beauty of the tunnel. The main forms of tunnel portals include end wall type, wing wall type, bamboo-cutting type, etc. Among them, the bamboo-cutting type portal is widely used in tunnel engineering because it can be coordinated with the surrounding landscape. The bamboo-cutting type portal is suitable for the situation with good geological conditions and gentle mountain slopes. It reduces the earthwork excavation volume at the tunnel entrance by appropriately cutting the mountain slope, and at the same time increases the stability of the tunnel entrance. Usually, the main structure of the bamboo-cutting type portal includes portal structure, open cut tunnel structure, lagging arch, etc. To ensure that the bamboo-cutting type portal is completely integrated with the surrounding environment, the open cut tunnel backfill usually adopts bottom rubble masonry + intermediate earth and rock backfill + surface clay layer backfill, and at the same time, hydroseeding is used for greening on the surface of the clay layer. This kind of greening scheme has achieved good application effects in Guizhou and Yunnan regions, and the greening can be basically completed after one rainy season, making the bamboo-cutting type portal completely integrated with the environment. However, in areas with large rainfall in the rainy season, when the surface of the open cut tunnel of the bamboo-cutting type portal is backfilled with clay + hydroseeding, its reliability and stability are poor, and under the action of heavy rain scouring, the entire slope will be seriously scoured and damaged. Content of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a tunnel bamboo-cutting ecological portal structure to at least solve the problems mentioned in the background technique.

[0004] The purpose of the utility model is realized through the following technical solutions:

[0005] A tunnel bamboo-cutting ecological portal structure includes a bamboo-cutting type portal, an open cut tunnel and an open cut tunnel backfill structure. The open cut tunnel backfill structure includes a lower layer vegetation bag backfill structure arranged on both sides of the arch feet of the open cut tunnel along the back of the bamboo-cutting type portal in sequence and an upper layer vegetation bag backfill structure in the range of the open cut tunnel crown.

[0006] Further, the upper layer vegetation bag backfill structure includes a rubble masonry layer, an earth and rock layer and an upper layer vegetation bag arranged successively upward along the crown of the open cut tunnel.

[0007] Furthermore, the backfill height of the rubble masonry layer is 5.5 - 6 meters, and the length is 9 - 9.5 meters; the backfill height of the soil and rock layer completely covers the arch ring of the cutting bamboo type portal, and an upper step backfill structure is provided on the front vertical surface of the soil and rock layer, and the upper vegetation bags are arranged on the upper steps.

[0008] Furthermore, the backfill slope of the upper step is 1:2.

[0009] Furthermore, the lower vegetation bag backfill structure includes a concrete layer and lower vegetation bags arranged on the concrete layer.

[0010] Furthermore, the back of the concrete layer is connected to the rubble masonry layer and the soil and rock layer, and a lower step backfill structure is provided on the front vertical surface. The width and height of the lower step are adapted to the cutting bamboo type portal, and the lower vegetation bags are arranged on the lower steps.

[0011] Furthermore, the backfill height of the concrete layer is 5.5 - 6 meters, and the length is 5.8 - 6 meters.

[0012] Furthermore, the backfill slope of the lower step is 1:1 - 1:2.

[0013] Furthermore, the concrete layer is C15 concrete.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The structure of the present utility model is simple and the cost is low. By improving the backfill structure of the open cut tunnel and adopting the scheme of replacing the hydroseeding with vegetation bags to green the cutting bamboo type portal, the applicability of the cutting bamboo type portal in areas with heavy rainfall can be greatly improved, the water damage accidents on the slope of the cutting bamboo type portal can be reduced, the reliability and stability of the cutting bamboo type portal can be improved, and the applicable range is wide, having good popularization prospects.

[0016] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings, wherein:

[0018] Figure 1 is a cross-sectional structure schematic diagram of the tunnel cutting bamboo type ecological portal structure provided by an embodiment of the present utility model;

[0019] Figure 2 The longitudinal section structure diagram of the tunnel bamboo-cutting ecological portal structure provided by an embodiment of the present utility model.

[0020] In the figure: 1. Bamboo-cutting portal; 2. Open cut tunnel; 3. Concrete layer; 4. Masonry rubble layer; 5. Earth and rock layer; 6. Lower vegetation bag; 7. Upper vegetation bag; 8. Inclined bank; 9. Excavation outline line. Specific implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only partial embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0022] Embodiment 1

[0023] As Figure 1 - Figure 2 shown, the present utility model provides a tunnel bamboo-cutting ecological portal structure, including a bamboo-cutting portal 1, an open cut tunnel 2 and an open cut tunnel backfill structure. The open cut tunnel backfill structure includes a lower vegetation bag backfill structure sequentially arranged on both sides of the springing range of the open cut tunnel 2 along the back of the bamboo-cutting portal 1 and an upper vegetation bag backfill structure in the crown range of the open cut tunnel 2.

[0024] The upper vegetation bag backfill structure includes a masonry rubble layer 4, an earth and rock layer 5 and an upper vegetation bag 7 sequentially arranged upward along the crown of the open cut tunnel 2. Among them, the backfill height of the masonry rubble layer 4 is 5.5 - 6 meters, and the length is 9 - 9.5 meters. The earth and rock layer 5 is backfilled at a slope of 1:2, and the backfill height should completely cover the lagging arch of the bamboo-cutting portal. The front facade of the earth and rock layer 5 can be backfilled according to the upper step structure, and the upper vegetation bag 7 can be placed on the upper step for greening, which is more convenient for the placement and fixation of the upper vegetation bag 7. In order to ensure the placement stability of the upper vegetation bag 7, the upper vegetation bag 7 can be fixed on the earth and rock layer 5 through a steel mesh.

[0025] The lower vegetation bag backfill structure includes a concrete layer 3 and a lower vegetation bag 6 arranged on the concrete layer 3. Among them, the back of the concrete layer 3 is connected to the mortar-laid rubble layer 4 and the soil and stone layer 5, and the front facade is backfilled according to the lower step structure. The width and height of the lower step are based on the slope of the bamboo-cut cave door, and the slope is generally 1:1-1:2. The lower vegetation bag 6 can be placed on the lower step for greening. Specifically, the backfill height of the concrete layer 3 is 5.5-6 meters and the length is 5.8-6 meters. The concrete layer 3 can be used as a retaining wall to prevent the soil and stone behind the concrete layer 3 from collapsing under the action of rainwater erosion. The concrete layer 3 is C15 concrete. In order to ensure the stability of the lower vegetation bag 6, the lower vegetation bag 6 can be fixed to the concrete layer 3 by a steel mesh.

[0026] The upper vegetation bag 7 and the lower vegetation bag 6 are vegetation bags used for ecological restoration of existing slopes, and include a bag body in which nutrient soil and green plant seeds can be placed, thereby achieving soil and water conservation and rapid greening effects.

[0027] Working principle and process of the device:

[0028] Step 1: Before excavating the portal, the excavation contour line 9 is laid out according to the back slope 8 and the slope rate of the side slope. After the laying out is completed, the arch construction begins, and the open hole excavation and the dark hole excavation are carried out in sequence. When the dark hole has advanced 20-30 meters, the bamboo-cut portal 1 and the open hole 2 structures are constructed in time.

[0029] Step 2: After the bamboo-cut gate 1 and the open hole 2 are constructed, backfill the open hole:

[0030] (2.1) The top of the open hole is backfilled with mortar-laid rubble, with a backfill height of 5.5 meters and a length of 9.2 meters, forming a mortar-laid rubble layer 4;

[0031] (2.2) The arch feet on both sides of the open hole are backfilled with C15 concrete, with a backfill height of 5.5 meters and a length of 5.8 meters. The facade is backfilled according to the lower step. The width and height of the lower step are based on the slope of the bamboo-cutting tunnel gate, generally at a slope of 1:2, to form concrete layer 3;

[0032] (2.3) The top of the mortar-laid rubble layer 4 is backfilled with soil and rocks at a slope of 1:2. The backfill soil and rocks should completely cover the arch of the bamboo-cut tunnel door to form a soil and rock layer 5;

[0033] (2.4) After the backfill construction of the mortar-laid rubble layer 4, the concrete layer 3, and the soil-rock layer 5 is completed, a lower-layer vegetation bag 6 is placed on the lower step of the concrete layer 3 for greening; an upper-layer vegetation bag 7 is used for greening above the soil-rock layer 5. The lower-layer vegetation bag 6 and the upper-layer vegetation bag 7 should be arranged according to the corresponding step size and can be fixed with a steel mesh if necessary.

[0034] Specifically, the protection net can cover the vegetation planting bag, and the side of the protection net can be fixed through the anchor pipes. By fixing the vegetation planting bag with the protection net, the stability of the vegetation planting bag is improved. At the same time, the protection net has large mesh holes and does not affect the growth of the vegetation in the vegetation planting bag.

[0035] The above are only the preferred embodiments of the present invention, and do not impose any form of confidentiality restrictions on the present invention. Any simple modifications, equivalent changes and decorations made to the above embodiments without departing from the content of the technical solution of the present invention and based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A tunnel bamboo-cutting ecological portal structure, comprising a bamboo-cutting portal (1), an open cut tunnel (2) and an open cut tunnel backfilling structure, characterized in that, The open cut tunnel backfill structure includes a lower layer vegetation bag backfill structure arranged on both sides of the arch feet of the open cut tunnel (2) along the back of the cut-and-cover tunnel portal (1) and an upper layer vegetation bag backfill structure in the arch crown range of the open cut tunnel (2).

2. The tunnel bamboo-cutting ecological portal structure according to claim 1, characterized in that The upper layer vegetation bag backfill structure includes a dry rubble masonry layer (4), an earth-rock layer (5), and an upper layer vegetation bag (7) arranged successively upward along the top of the open cut tunnel (2).

3. The tunnel bamboo-cutting ecological portal structure according to claim 2, characterized in that, The backfill height of the dry rubble masonry layer (4) is 5.5 - 6 m, and the length is 9 - 9.5 m; the backfill height of the earth-rock layer (5) is to completely cover the lagging of the cut-and-cover tunnel portal, and an upper layer step backfill structure is provided on the front vertical surface of the earth-rock layer (5), and the upper layer vegetation bag (7) is arranged on the upper layer step.

4. The tunnel bamboo-cutting ecological portal structure according to claim 3, characterized in that The backfill slope of the upper layer step is 1:

2.

5. The tunnel bamboo-cutting ecological portal structure according to claim 2, characterized in that, The lower layer vegetation bag backfill structure includes a concrete layer (3) and a lower layer vegetation bag (6) arranged on the concrete layer (3).

6. The tunnel bamboo-cutting ecological portal structure according to claim 5, characterized in that, The back of the concrete layer (3) is connected to the dry rubble masonry layer (4) and the earth-rock layer (5), and a lower layer step backfill structure is provided on the front vertical surface. The width and height of the lower layer step are adapted to the cut-and-cover tunnel portal (1), and the lower layer vegetation bag (6) is arranged on the lower layer step.

7. The tunnel bamboo-cutting ecological portal structure according to claim 6, characterized in that, The backfill height of the concrete layer (3) is 5.5 - 6 m, and the length is 5.8 - 6 m.

8. The tunnel bamboo-cutting ecological portal structure according to claim 7, characterized in that, The backfill slope of the lower layer step is 1:1 - 1:

2.

9. The tunnel bamboo-cutting ecological portal structure according to claim 8, characterized in that, The concrete layer (3) is C15 concrete.

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