Method for deep tunnel opening and repairing

FIELD: building, particularly to reconstruct underground structures and reinforce foundations and engineering services in confined space.

SUBSTANCE: method involves reinforcing foundation in vicinity of existent structures; building vertical tube with the use of well rings; excavating ground with the use of grab; breaking tunnel liner and driving tunnel. Method of foundation reinforcement near existent structures involves injecting quick-setting cement mix through perforated pipes installed in wells drilled through support foundation part and ground; drilling guiding wells beyond vertical tube below upper tunnel level and ground water level; providing guiding wells with casing pipes; injecting grouting mortar in ground through casing pipes up to grouting mortar appearance at well head; installing well rings having perforation orifices along ring perimeters and installing injectors in above orifices; additionally reinforcing contour part of vertical tube by supplying grouting mortar through orifices in well rings; breaking tunnel link section after well ring laying onto upper liner plate of deep tunnel by cutting orifices having necessary dimensions; removing tunnel link section and seating well ring on rock base; concreting well ring; forming two orifices in well ring before tunnel driving arranged in direction of tunnel reconstruction; driving the tunnel and installing support members.

EFFECT: extended field of usage, reliability and safety of operations.

4 dwg

 

The invention relates to the production of works on reconstruction of underground structures and strengthening of foundations and underground structures and utilities in cramped conditions.

There is a method to open and repair, based on the method of construction of the tunnel (A.S. No. 694645, E 21 D 9/00 ), including driving along the walls of the pit metal piles, the choice of the pound between them, the setting items of the tunnel, where the piling along the walls of the pit tear trench depth below the pit bottom to the impermeable layer, which are filled with concrete.

This method in the production of repair work is labor-intensive, as it requires excavation of the pit for the entire site repairs. While working in cramped conditions, when there are buildings and structures, this method is practically impossible to implement.

Closest to the proposed technical solution is the way to open and repair of deep-level tunnel (Stoll T.M., Telichenko V.I., Feklin V.I. Technology construction of the underground part of buildings and structures. M, stroiizdat, 1990, s-254), including the strengthening of the Foundation located near facilities, the construction of the vertical shaft by the method of lowering lining, excavation bucket installation and device of the tunnel.

There is a method to open and repair t is Nela deep foundations may be used in a strong stable rock surrounding the tunnel of the array. Weakened and watered the rock surrounding the tunnel array require additional work to strengthen the array.

Unified technical result of the proposed technical solution is the expansion of the use of the method, the reliability and safety of operations.

Unified technical result is achieved by the fact that in the known method of dissection and repair of deep-level tunnel, including the strengthening of the Foundation located near facilities, the construction of the vertical shaft by the method of lowering lining, excavation bucket installation and device of the tunnel, the strengthening of the Foundation located near structures is carried out by injection of quick setting cement mortar through the perforated pipe installed in a borehole drilled through the base of the Foundation and the soil, with the contour of the vertical shaft Buryats guides are well below the upper level of the tunnel deep under the surface and groundwater levels, guides wells supply casing, pump cement slurry into the ground through the casing guides wells before the advent of the solution in the mouth of the well, install rings and lowering the support, the ring standpipe lining perforined on the perimeter of the holes, install the injectors, providing additional strengthening for vtorogo array around a vertical shaft by filing a cement slurry through the holes in the rings and lowering the support, after landing the first ring surge of support in the upper tubing tunnel deep under the surface reveal the shield section of the tunnel deep under the surface by cutting holes of the required size, after removal of the shields produce a landing ring surge of support in the bedrock, carry out the fixing of the bottom ring standpipe lining concrete, before tunneling deep-level in the surge supports fulfill two holes on a course of recovery of deep-level tunnel, then perform the tunneling deep foundations and the installation of fastening elements.

Strengthening the Foundation near structures by injection of quick-setting cement mortar through the perforated pipe installed in a borehole drilled through the base of the Foundation and the soil, provides for the creation associated with Foundation support deep concrete piles, are able to keep the Foundation of a building without roll when landing.

The drilling path of the vertical shaft guides wells below the level of the tunnel deep under the surface and aquifer level, the discharge into the soil cement slurry through the casing installed in the well, provides stabilization of the standpipe sections lining during installation, to improve the safety of operations during the sinking of the vertical shaft and tunnel due to do is eradicate the possibility of a breakthrough unbound substrate in a vertical shaft and tunnel.

Additional strengthening zakomornogo array around a vertical shaft by pumping cement slurry by injectors through the holes in the rings standpipe lining ensures the creation of three-dimensional rigid frame, preventing the possibility of breaking the unbound ground in sunk well, which in turn increases the safety of operations.

The opening of the shield tunnel deep under the surface during the landing of the first ring surge of support in the upper tubing tunnel allows you to monitor the status of internal parts of the tunnel, which increases the safety of operations.

Landing ring surge of support in the bedrock and the fastening of the bottom ring concrete eliminates the possibility of penetration of groundwater and soil in the tunnel during further operations, which increases the safety and reliability of operations.

Cutting two holes in the surge lining during recovery of deep-level tunnel allows you to monitor the condition within the restored tunnel and increases the security of future works.

Excavation and installation of elements of the tunnel deep under the surface in the fortified array ensures the safety and reliability of operations.

The proposed method is illustrated by drawings, where

figure 1 shows the scheme of strengthening of the base located near structures;

figure 2 shows the plan surface area of operations;

figure 3 shows a diagram of the landing ring surge of support in the upper tubing lining tunnel deep under the surface, and the opening of the tunnel;

figure 4 is a diagram of the lower ring surge of support in the bedrock and the bottom mounting ring standpipe lining.

The proposed method is as follows.

On the site of the work surface through the base slab (1) structure located near the installation 1 BGA-15M drilled wells (2) to the desired depth. After drilling each hole is placed a metal pipe (3)with initial and final parts of the perforation holes. The pipe in the well is placed so that one perforated portion (4) is located on the pebble layer (5)and the other (6) under strengthened by the base slab. Around the upper perforated section (6) expose the casing (7) and provide an insulating layer (8) between the upper edge of the perforated zone (6) and plate (1). Then using injection installation served in the pipe quick setting solution:t:P=1:2:1 with the addition of 3-3,5% CaCl2. Working pressure is determined in the process of discharge experimentally (up to 10 ATM). The injection of the solution can provide skid plate and create support in its n the sung parts, thereby ensuring the maintenance console-serving part of the basement.

After work on strengthening the Foundation (1) located near structures on the surface (9) of the site work are marking guides wells for loop prepared for sinking vertical shaft (10). The guide bore (11) of the Buryats to the aquifer (12).

Drilled wells (11) supply of casing pipes.

On the surface (9) site work on the markup set first ring standpipe lining (13). Gripper unit (14)attached to the hoist (15)develop the soil inside the ring in the direction from the center to the knife. Ring standpipe lining (13), losing the support of the soil under the knife, under the action of its own weight goes down, squeezing the soil from under the knife inside the ring standpipe lining (13).

For the construction of a vertical shaft (10) use a standpipe o-ring lining segments, blade portion of the first ring standpipe lining and ring segments standpipe roof supports are metal. As excavation and lowering lining lining up. The capacity of the lining is carried out by placing segments subsequent rings lining the lining segments of the previous ring. The segments of the rings lining and ring supports (13) are interconnected using privredni the metal plates.

When lowering lining produce the strengthening of the array for contour vertical shaft (10). For this purpose through the casing pipe installed in the guide holes (11), pump cement slurry prior to its appearance in the wellhead.

During the construction of the vertical shaft (10) provides additional strengthening zakomornogo array. When installing the rings standpipe lining ring any punching along the perimeter of the holes (16). When the depth of the rings for 1-1,5 m in hole (16) clogged or zadumivaetsa using perforator injectors (17). After installing the injectors (17) the injection in secondary array cement slurry under pressure to 10 ATM.

When planting the first ring standpipe lining (13) on the upper tubing of the tunnel (18) deep foundations autopsy shields, shield cut out hole (19) of the desired size for the subsequent drilling and fastening tunnel (18) deep foundations. After eliminating recopilaciones mass is cutting holes in all the section of the tunnel.

After disassembly of the tunnel is landing version supports vertical shaft (10) on the bedrock with subsequent mandatory concreting the bottom of the ring standpipe lining.

Before the sinking of the tunnel (18) deep laying in the ring standpipe lining (13 perform two holes (20) in the course of the recovery tunnel (18) deep foundations.

After inspection of the internal condition of the tunnel (18) deep-level depending on the strength plugged space around the tunnel (18) deep bedding is horizontal tunnel excavation (18) deep foundations and installation of items lining the tunnel (18) deep foundations.

The application of the proposed method at the opening and repair of deep-level tunnel at JSC "West-metallurgical plant" , Novokuznetsk allowed safely and in the shortest possible time (3 months) to eliminate the emergency and to prevent stopping of the plant.

How to open and repair of deep-level tunnel, including the strengthening of the Foundation located near facilities, the construction of the vertical shaft by the method of lowering lining, excavation bucket installation, the destruction of the membranes of the tunnel and the tunnel device, characterized in that the strengthening of the Foundation located near structures is carried out by injection of quick-setting cement mortar through the perforated pipe installed in a borehole drilled through the base of the Foundation and the soil, with the contour of the vertical shaft Buryats guides are well below the level of the top of the tunnel deep under the surface and groundwater levels, guides wells supply casing is a pipe, pump cement slurry into the ground through the casing of the wells until the solution in the mouth of the well, install rings and lowering the support, the ring standpipe lining perforined on the perimeter of the holes, the holes are installing the injectors, providing additional strengthening zakomornogo array vertical shaft by filing a cement slurry through the holes in the rings and lowering the support, after landing ring surge of support in the upper tubing tunnel deep under the surface reveal the shield section of the tunnel by cutting holes of the required size, after removal of the shields produce a landing ring surge of support in the bedrock, carry out the fixing of the bottom ring standpipe lining concrete, before tunneling deep foundations in the version supports fulfill two holes on a course of recovery of deep-level tunnel, then perform the tunneling deep foundations and the installation of fastening elements.



 

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