CN218862611U - TBM lateral level crossing mountain area highway tunnel tunneling parallel pilot tunnel construction structure - Google Patents

Abstract

The utility model provides a TBM lateral level crossing mountain area highway tunneling parallel pilot tunnel construction structure, which is characterized in that; the construction structure comprises drilling and blasting branch holes, drilling and blasting hole platform, TBM branch holes, TBM hole platform, main line tunnel, parallel pilot tunnel, plugging area, driving transverse hole and the like; the utility model discloses a two tunnel scheme of advancing into hole avoid TBM passageway and thread tunnel to be handed over the traffic interference between the hole, the utility model discloses to bore the method of exploding and combine together with the TBM method, solved mountain area highway and be difficult for adopting the TBM equipment of forward scheme of advancing into hole and initiate and advance the hole problem. The utility model discloses when being applied to the construction of extra long tunnel, can shorten construction cycle, show and improve social and economic benefits.

Description

TBM lateral level crossing mountain area highway tunnel tunneling parallel pilot tunnel construction structure

Technical Field

The utility model belongs to the technical field of tunnel construction, specifically TBM side direction level crossing mountain area highway tunnel tunnelling parallel pilot tunnel construction structures.

Background

The TBM is a highly mechanized and automated large tunnel excavation lining complete equipment, has the advantages of high construction speed, manpower saving, safety, economy, one-step forming and the like, and is mechanical equipment with the most development potential in rock tunnel excavation. In the current mountain expressway construction, TBM is mainly applied to the parallel pilot tunnel construction of an extra-long tunnel more than 10 km.

The mountain expressway usually adopts a bridge-tunnel connection design, the TBM requires that a parallel pilot tunnel is provided with an assembly initial site with a tunnel opening extending outwards for at least 60m and a width not less than 25m, when the tunnel opening is positioned on a steep cliff, auxiliary engineering measures such as a steel platform need to be taken to meet the requirement of the TBM assembly initial site, and when the height difference between the tunnel opening and the ground is too large, the scheme that the steel platform is taken as the assembly initial site is high in manufacturing cost, poor in technical economy and large in safety risk.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, and provides a parallel pilot tunnel construction structure for tunneling a tunnel of a highway in a TBM lateral level crossing mountain area; the method is suitable for TBM level crossing tunnel tunneling construction which is not easy to adopt a forward tunneling scheme.

The utility model is realized in such a way that a TBM lateral level crossing mountain area highway tunnel tunneling parallel pilot tunnel construction structure is constructed, which is characterized in that; the construction structure comprises a drilling and blasting branch hole and a drilling and blasting opening platform, a TBM branch hole and a TBM opening platform, a main line tunnel, a parallel pilot tunnel, a plugging area and a vehicle transverse hole.

According to the utility model, the parallel pilot tunnel construction structure for tunneling the highway tunnel in the TBM lateral level crossing mountain area is characterized in that; the TBM branch tunnel comprises a drilling and blasting section and a TBM section; wherein the drilling and blasting section has a length of 170m, and comprises an initial hole with a length of 25m and a stepping hole with a length of 145 m.

According to the utility model, the parallel pilot tunnel construction structure for the tunnel excavation of the expressway in the TBM lateral level crossing mountain area is characterized in that; the length of the drilling and blasting opening platform along the axial direction of the opening section of the drilling and blasting branch hole is not less than 15m, the width of the drilling and blasting opening platform is not less than 20m, and the drilling and blasting opening platform comprises a drilling and blasting opening and a drilling and blasting opening site; the length of the TBM tunnel portal platform along the axial direction of the tunnel portal section of the TBM branch tunnel is not less than 50m, the width of the TBM tunnel portal platform is not less than 25m, and the TBM tunnel portal platform comprises a TBM tunnel portal and an assembly starting site.

According to the utility model, the parallel pilot tunnel construction structure for tunneling the highway tunnel in the TBM lateral level crossing mountain area is characterized in that; the main line tunnel comprises a tunnel first-line section and a tunnel second-opening section; the parallel pilot tunnel comprises a horizontal pilot drill blasting section, a horizontal pilot TBM section and a horizontal pilot back opening section.

The utility model provides a TBM side direction level crossing mountain area highway tunnelling parallel pilot tunnel construction structures and method here is applicable to the TBM level crossing tunnel tunnelling construction that is difficult for adopting the forward scheme of advancing into a cave, has following advantage:

(1) The method combines the drilling and blasting method and the TBM method, and solves the problems of TBM assembly initiation and hole entry in a forward hole entry scheme which is not easy to adopt on a highway in mountain areas. When the method is applied to construction of the extra-long tunnel, the construction period can be shortened, and the social and economic benefits are obviously improved.

(2) When the hole is positioned on a steep cliff, compared with the method for constructing a steel platform as a TBM assembly starting site, the method can reduce the engineering cost and the construction safety risk and has better technical economy.

(3) The method adopts a drilling and blasting branch hole and TBM branch hole double-branch hole entering scheme to avoid traffic interference between the TBM channel and the main line tunnel by the intersected holes, is convenient for construction organization, and can accelerate the construction period.

Drawings

FIG. 1 is a flow chart of the construction process of the present invention;

FIG. 2 is a construction design floor plan of the present invention;

FIG. 3 is a view A taken from FIG. 2;

fig. 4 is a diagram of the tunneling sequence of the present invention;

FIG. 5 is a schematic plan view of a TBM working branch hole plugging area;

fig. 6 is a schematic plan view of a main line tunnel, a parallel pilot tunnel and a drilling and blasting branch tunnel blocking area after penetration.

Wherein: the method comprises the following steps of drilling and blasting a branch hole 1, drilling and blasting a hole platform, a TBM branch hole 3, a drilling and blasting section 301, a TBM section 302, a TBM hole platform 4, a main line tunnel 5, a tunnel first-line section 501, a tunnel second-opening section 503, a parallel pilot hole 6, a horizontal pilot drilling and blasting section 601, a horizontal pilot TBM section 602, a horizontal pilot second-opening section 603, a plugging section 7 and a vehicle-parallel transverse hole 8.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings 1-6, wherein the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a TBM side direction level crossing mountain area highway tunnel tunnelling parallel pilot tunnel construction structures here, as shown in fig. 2-6, can implement according to the following mode;

as shown in fig. 2-3, the construction structure has a drilling and blasting branch tunnel 1 and a drilling and blasting opening platform 2, a TBM branch tunnel 3 and a TBM opening platform 4, a main line tunnel 5, a parallel pilot tunnel 6, a plugging area 7, a vehicle transverse tunnel 8 and the like; the length of the drilling and blasting opening platform 2 is not less than 15m and the width of the drilling and blasting opening platform is not less than 20m along the axial line direction of the opening section of the drilling and blasting branch hole 1, and the drilling and blasting opening platform 2 comprises a drilling and blasting opening and a drilling and blasting opening site; the length of the TBM hole platform 4 along the axial direction of the hole section of the TBM branch hole 3 is not less than 50m, the width of the TBM hole platform 4 is not less than 25m, and the TBM hole platform 4 comprises a TBM hole and an assembly starting site; as shown in fig. 2 and 5, the TBM branch hole 3 comprises a drilling and blasting section 301 and a TBM section 302, wherein the drilling and blasting section 301 has a length of 170m and comprises an initial hole with a length of 25m and a stepping hole with a length of 145 m; as shown in fig. 5, the main line tunnel 5 includes a tunnel advance section 501 and a tunnel after-open section 503; the parallel pilot tunnel 6 includes a flat pilot drill burst section 601, a flat pilot TBM section 602, and a flat pilot post-opening section 603.

As shown in figure 1, the construction process flow and the operation key points of the utility model are as follows;

step 1, construction design:

1) As shown in fig. 2, a gentle slope or a terrace is selected near the main line tunnel 5, and a drilling and blasting branch tunnel 1, a drilling and blasting tunnel portal platform 2, a TBM branch tunnel 3 and a TBM tunnel portal platform 4 are planned; and satisfies the following requirements;

cross working interference is not generated between the drilling and blasting hole platform 2 and the TBM hole platform 4;

the drilling and blasting branch holes 1 are arranged on one side, close to the hole opening of the main line tunnel 5, of the TBM branch hole 3 and are intersected with the main line tunnel 5 and the parallel pilot tunnel 6, and the drilling and blasting branch holes 1 are preferably arranged in a mode that not more than 8% of longitudinal slope uphill tunneling;

the tail section of the TBM branch tunnel 3 is intersected with the main line tunnel 5 by a circular curve and is tangent with the parallel pilot tunnel 6, the radius of the circular curve is not less than 800m, the TBM branch tunnel 3 is controlled by a longitudinal slope which is not more than 5 percent, and the longitudinal slope is designed according to the uphill tunneling;

2) As shown in fig. 3, the main line tunnel 5 is affected by the TBM branch tunnel 3 and extends 30m length to both ends to form a main line tunnel rear opening section 501; the parallel pilot tunnel 6 is affected by the TBM branch tunnel 3 and extends 30m to the opening to form a flat pilot rear opening section 603;

3) As shown in fig. 3, a plugging area 7 is arranged at a hole opening formed by a TBM branch tunnel 3 and a drilling and blasting branch tunnel 1 passing through a main line tunnel 5 arch wall, a parallel pilot tunnel 6 arch wall and the like, and the thickness of the plugging area 7 is controlled according to the radial direction of the main line tunnel and the parallel pilot tunnel which is not less than 5 m.

Step 2, construction preparation: leveling a drilling and blasting hole platform 2 and a TBM hole platform 4, lofting and constructing a drilling and blasting hole and a TBM hole, constructing an assembly starting site, and arranging hole facilities;

step 3, constructing a drilling and blasting branch tunnel 1 and a drilling and blasting section 301 as the tunneling sequence 1 in the figure 4;

step 4, constructing the remaining section of the drilling and blasting branch tunnel 1, the TBM section 302, the main line tunnel 5 and the parallel pilot tunnel 6 as the tunneling sequence 2-the tunneling sequence 4 in the figure 4;

1) TBM construction: the TBM is assembled and stepped at the same time, the starting tunnel is entered after the whole machine is assembled and debugged, the stepping and starting operation of the TBM are completed, the normal tunneling of the TBM is entered, and the operations of the TBM branch tunnel 3 and the horizontal guide TBM section 602 are completed in sequence;

2) Drilling and blasting construction: constructing the remaining section of the drilling and blasting branch hole 1 by adopting a drilling and blasting method, and tunneling a tunnel parallel section 501 and a drilling and blasting-leading section 601 towards two ends at the intersection of the drilling and blasting branch hole 1, a main line tunnel 5, a parallel pilot tunnel 6 and the like by adopting a newly-added working face;

3) Newly adding an in-hole working surface:

during the tunneling of the tunnel advance section 501, the completed tunnel advance section 501, the pilot TBM section 602 and the crossheading 8 are used as channels to construct the tunnel advance section 501 of the other tunnel;

after the horizontal pilot TBM section 602 is finished, TBM equipment is taken out, a parallel pilot tunnel 6 is used for constructing a transverse cross tunnel 8 connected with a main line tunnel 5, and a new working face is added to realize the sectional tunneling of the tunnel pilot section 501.

Step 5, as shown in fig. 5, filling the slab stone concrete by a mold building method to construct a plugging area 7;

step 6, as shown in fig. 5-6, constructing a tunnel rear opening section 503 and a plane guidance rear opening section 603 by a drilling and blasting method;

and 7, finishing the residual engineering construction of the main line tunnel 5.

The utility model has the following improvements and advantages:

the method combines a drilling and blasting method and a TBM method, and solves the problems that the expressway in mountain areas is not easy to adopt a positive hole entering scheme for TBM assembly starting and hole entering. When the method is applied to construction of the extra-long tunnel, the construction period can be shortened, and the social and economic benefits are obviously improved.

And 2, when the opening is positioned on a steep cliff, compared with the method for constructing a steel platform as a TBM (tunnel boring machine) assembly initial site, the method can reduce the engineering cost and the construction safety risk and has better technical economy.

And 3, the method adopts a drilling and blasting branch hole and TBM branch hole double-branch hole entering scheme to avoid traffic interference between the TBM channel and the main line tunnel by the intersected holes, is convenient for construction organization, and can accelerate the construction period.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention 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 (4)

1. A parallel pilot tunnel construction structure for TBM lateral level crossing mountain expressway tunnel tunneling is characterized in that; the construction structure is provided with a drilling and blasting branch hole (1), a drilling and blasting hole platform (2), a TBM branch hole (3), a TBM hole platform (4), a main line tunnel (5), a parallel pilot tunnel (6), a blocking area (7) and a vehicle transverse hole (8).

2. The construction structure of the parallel pilot tunnel tunneling of the expressway in the TBM lateral level crossing mountain area according to claim 1, it is characterized in that; the TBM branch tunnel (3) comprises a drilling and blasting section (301) and a TBM section (302); wherein the drilling and blasting section (301) is 170m in length and comprises an originating hole 25m long and a stepping hole 145m long.

3. The construction structure of the parallel pilot tunnel tunneling of the expressway in the TBM lateral level crossing mountain area according to claim 1, it is characterized in that; the length of the drilling and blasting hole platform (2) is not less than 15m and the width of the drilling and blasting hole platform is not less than 20m along the axial direction of the hole section of the drilling and blasting branch hole (1), and the drilling and blasting hole platform (2) comprises a drilling and blasting hole and a drilling and blasting hole site; the length of the TBM hole platform (4) along the axial direction of the hole section of the TBM branch hole (3) is not less than 50m, the width of the TBM hole platform is not less than 25m, and the TBM hole platform (4) comprises a TBM hole and an assembly starting site.

4. The construction structure of the parallel pilot tunnel tunneling of the expressway in the TBM lateral level crossing mountain area according to claim 1, it is characterized in that; the main line tunnel (5) comprises a tunnel advancing section (501) and a tunnel opening section (503); the parallel pilot tunnel (6) comprises a flat pilot drilling and blasting section (601), a flat pilot TBM section (602) and a flat pilot post-opening section (603).

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