CN104197796A - Annular layering blasting shock absorption method for shallowly-buried large-section tunnel to pass underneath existing building - Google Patents

Abstract

The invention discloses an annular layering blasting shock absorption method for a shallowly-buried large-section tunnel to pass underneath an existing building. Steel pipes with the separation distance of 40 cm and the diameter of 108 mm are arranged in an arch portion of the tunnel within the range of 120 degrees to 150 degrees in a driving mode, the length of the steel pipes are controlled to be 10 m to 30 m, and the angle of the steel pipes should not be larger than 3 degrees to 5 degrees; a small guide pipe with the separation distance of 40 cm and the diameter of 42 mm is arranged between every two large pipe sheds in a driving mode, the length of the small guide pipes is controlled to be 3 m to 5 m, and the angle of the small guide pipes should not be larger than 3 degrees to 5 degrees; grouting of the large pipe sheds and the small guide pipes is carried out after the tunnel passes the segment smoothly in an excavation mode; an upper step of the tunnel is transversely grooved in a wedged mode; annular layering blasting excavation is carried out on cut spreader holes, and detonators on different levels are used for blasting in different areas; auxiliary holes and peripheral holes in the upper step of the tunnel are also excavated through annular layering and segmented blasting; a middle step and a lower step of the tunnel are blasted and excavated vertically along with layers and segments. According to the annular layering blasting shock absorption method for the shallowly-buried large-section tunnel to pass underneath the existing building, harm caused by tunnel blasting can be effectively reduced.

Description

Under Shallow tunnel with large cross-section, wear the annular layering blasting isolation method of existing building

Technical field

The invention belongs to circuit technical field, be specially a kind of annular layering blasting isolation method of wearing existing building under Shallow tunnel with large cross-section.

Background technology

Tunnel is as the node engineering in line project, and due to the difference of landform and landforms, constructing tunnel has great polytropy.Just because of these reasons, in the construction project in crossings on different level formula tunnel, Mountain Urban Area, will have a lot of unforeseen difficulties and danger, as: new built tunnel and existing tunnel and and existing buildings or structures between upper across, under the blast working worn while constructing with low coverage be exactly a difficulties, perplexing engineers and technicians always.How to reduce the vibration effect of blast working to the existing buildings or structures of low coverage, take which kind of effective glissando etc., these are all under the shallow tunnel of Mountain Urban Area, to wear or the upper technical barrier that will face across existing buildings or structures.These issue handlings are slightly improper, bring great threat and loss not only can to the people's life and property, and can bring great negative social impact.

Summary of the invention

In order to solve problems of the prior art, the invention provides a kind of annular layering blasting isolation method of wearing existing building under Shallow tunnel with large cross-section, not only can greatly reduce vibration velocity and the harm to existing buildings or structures of Tunnel Blasting, and the phenomenon that can effectively control the generation of out break phenomenon and avoid construction to disturb residents.This technical method has important directive significance and application and popularization value to construction and the development of crossings on different level pattern in tunnel in Mountain Urban Area.Its technical scheme is:

An annular layering blasting isolation method of wearing existing building under Shallow tunnel with large cross-section, comprises the following steps:

1) first, within the scope of 120 °-150 ° of arch, tunnel, set spacing 40cm, diameter 108mm steel pipe, length is controlled at 10-30m, and angle should not be greater than 3 °-5 °; Secondly, between every two bassoon canopies, cover is played spacing 40cm, diameter 42mm ductule, and length is controlled at 3-5m, and angle should not be greater than 3 °-5 °; Finally, the slip casting of carrying out bassoon canopy and ductule after tunnel excavation is smoothly by this section is worked;

2) in tunnel, top bar and apply horizontal wedge type slotting; Cut spreader hole carries out annular layering Blasting Excavation, and zones of different adopts the blasting cap initiation of different sections;

3) via hole that top bar in tunnel and periphery hole adopt annular layering, segment blast excavation equally;

4) in tunnel, the Blasting Excavation of getting out of a predicament or an embarrassing situation all adopts the upper and lower method along layering, segmentation to carry out Blasting Excavation.

Compared with prior art, beneficial effect of the present invention is:

The present invention not only can reduce vibration velocity and the harm to existing buildings or structures of Tunnel Blasting greatly, and the phenomenon that can effectively control the generation of out break phenomenon and avoid construction to disturb residents.This technical method has important directive significance to construction and the development of crossings on different level pattern in tunnel in Mountain Urban Area.

Accompanying drawing explanation

Fig. 1 is annular layer and section blasting isolation excavation method schematic diagram, wherein: numeral-detonator section, ●-powder charge hole, zero-emptying aperture;

Fig. 2 is that leading damping ductule coordinates damping daguanpeng construction schematic diagram;

Fig. 3 is that emptying aperture coordinates horizontal slotting and expands groove construction schematic diagram;

Fig. 4 is the annular layer and section blast working schematic diagram of topping bar;

Fig. 5 is middle step horizontal slice segment blast construction schematic diagram;

Fig. 6 is the horizontal slice segment blast construction schematic diagram of getting out of a predicament or an embarrassing situation.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described further.

The technology of the present invention method is comprised of three parts content.First is shock absorption system---damping bassoon canopy coordinates damping ductule; Second portion is controlled blasting excavation system---emptying aperture is equipped with wedge shot, cut spreader hole, via hole and the layering of periphery hole annular, segment blast excavation; Third part is middle step and the suitable layer and section explosion system of getting out of a predicament or an embarrassing situation, as shown in Figure 1.

An annular layering blasting isolation method of wearing existing building under Shallow tunnel with large cross-section, comprises the following steps:

1) first, within the scope of 120 °-150 ° of arch, tunnel, set spacing 40cm, diameter 108mm steel pipe, length is controlled at 10-30m, and angle should not be greater than 3 °-5 °; Secondly, between every two bassoon canopies, cover is played spacing 40cm, diameter 42mm ductule, and length is controlled at 3-5m, and angle should not be greater than 3 °-5 °; Finally, the slip casting of carrying out bassoon canopy and ductule after tunnel excavation is smoothly by this section is worked; As Fig. 2;

2) in tunnel, top bar and apply horizontal wedge type slotting; Cut spreader hole carries out annular layering Blasting Excavation, and zones of different adopts the blasting cap initiation of different sections, in Fig. 1 part and Fig. 3;

3) via hole that top bar in tunnel and periphery hole adopt annular layering, segment blast excavation equally, in Fig. 1 part and Fig. 4;

4) in tunnel, the Blasting Excavation of getting out of a predicament or an embarrassing situation all adopts the upper and lower method along layering, segmentation to carry out Blasting Excavation, respectively as in Fig. 1 part and Fig. 5, Fig. 6.

The above; it is only the preferably specific embodiment of the present invention; protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art; in the technical scope disclosing in the present invention, the simple transformation of the technical scheme that can obtain apparently or equivalence are replaced and are all fallen within the scope of protection of the present invention.

Claims (1)

1. an annular layering blasting isolation method of wearing existing building under Shallow tunnel with large cross-section, is characterized in that, comprises the following steps:

1) first, within the scope of 120 °-150 ° of arch, tunnel, set spacing 40cm, diameter 108mm steel pipe, length is controlled at 10-30m, and angle should not be greater than 3 °-5 °; Secondly, between every two bassoon canopies, cover is played spacing 40cm, diameter 42mm ductule, and length is controlled at 3-5m, and angle should not be greater than 3 °-5 °; Finally, the slip casting of carrying out bassoon canopy and ductule after tunnel excavation is smoothly by this section is worked;

2) in tunnel, top bar and apply horizontal wedge type slotting; Cut spreader hole carries out annular layering Blasting Excavation, and zones of different adopts the blasting cap initiation of different sections;

3) via hole that top bar in tunnel and periphery hole adopt annular layering, segment blast excavation equally;

4) in tunnel, the Blasting Excavation of getting out of a predicament or an embarrassing situation all adopts the upper and lower method along layering, segmentation to carry out Blasting Excavation.