CN114876476A - Shield safe receiving channel in karst and shield tunnel construction method - Google Patents
Shield safe receiving channel in karst and shield tunnel construction method Download PDFInfo
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- CN114876476A CN114876476A CN202210614805.XA CN202210614805A CN114876476A CN 114876476 A CN114876476 A CN 114876476A CN 202210614805 A CN202210614805 A CN 202210614805A CN 114876476 A CN114876476 A CN 114876476A
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- shield
- bamboo
- receiving channel
- cut
- grouting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
Abstract
The invention discloses a shield safe receiving channel in karst and a shield tunnel construction method, comprising a bamboo-cut receiving channel and an end wall which are positioned on the side wall of a shield receiving working well and correspond to a shield tunnel; the end wall comprises an upper half end wall arranged at the part of the bamboo-cut-shaped receiving channel with the semi-annular cross section and a lower half end wall arranged between the part of the bamboo-cut-shaped receiving channel with the semi-annular cross section and the part of the bamboo-cut-shaped receiving channel with the full-annular cross section; a plurality of system anchor rods are arranged on the outer side wall of the bamboo-cut receiving channel above the horizontal plane where the axis is located, a plurality of foot locking anchor rods are arranged on the part, close to the horizontal plane where the axis is located, of the part with a semi-annular cross section, and a grouting pipe is arranged between the inner side of the bamboo-cut receiving channel and the outer wall of the shield tunnel; and a pipe shed is arranged on the outward side of the upper half end wall. During construction, a shield receiving working well and a bamboo-shaped receiving channel are constructed firstly, and grouting filling is carried out through a grouting pipe after a shield tunnel is completed. The method can solve the contradiction between shield receiving and karst exploration and difficult karst processing in the karst area.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a shield safe receiving channel in karst and a shield tunnel construction method.
Background
The shield construction method is an advanced construction method with high mechanization degree, quick construction progress and mature process, and is increasingly widely applied to southwest karst strata, such as subway tunnels, underground passages, pipeline galleries and other projects. The shield construction method applied in karst inevitably faces risks brought by karst cave, and particularly when the shield enters and exits the cave, the stability of the portal is affected by the karst, and the safety of entering and exiting the cave is directly determined. How to adopt an effective method to solve the adverse effect of karst on entering and exiting the hole is the basis of shield application in karst strata.
State of the art related art:
before the shield machine receives the shield machine, the enclosure structure and the steel bars thereof need to be broken in advance, and then the shield machine tunnels into the shield working well. The conventional method is to reinforce the foundation of the soil body behind the portal, so that the strength and stability of the reinforced soil body behind the portal meet the self-supporting requirement, and the portal is ensured to be safe when the building envelope and the steel bars thereof are broken. In a karst stratum, if the section of the shield tunnel is positioned in a rock stratum, the rock mass behind a tunnel portal does not need to be reinforced, and the strength and the stability of the shield tunnel can also meet the self-supporting requirement. However, the presence of karst in the rock body causes the side pressure to be much larger than that of the rock body due to the filling of karst pipeline water or clay in a flowing plastic shape, and the cave door can be collapsed.
Aiming at the risk processing of the karst to the receiving safety during the shield receiving, the conventional method is that after the karst behind the tunnel portal is processed in advance, the shield passes through and receives again. The processing means is mainly grouting or backfilling, namely, exploratory holes are utilized to drill and encrypt the exploratory karst cave areas, then concrete is grouted or backfilled from the ground to fill the karst caves, and after a reinforced body with strength is formed, the shield penetrates through the karst caves again, so that the receiving risk is avoided.
However, it is extremely difficult to accurately judge the karst stratum in karst development and accurately process the karst stratum. The distribution quantity of karst caves is extremely large, the karst development of 'bead-shaped' is more, the distribution position of the karst is difficult to accurately judge, and the carpet type search and treatment cost a great time limit and engineering investment, but the treatment effect is difficult to estimate. Furthermore, the ground is provided with buildings, important municipal pipelines or underground structures so that the ground is free of treated conditions. These difficulties make conventional karst treatment approaches often difficult to implement.
Therefore, under the conditions of rapid development of technology, severe environmental restriction conditions and high social influence requirements, the receiving method can be safely, economically and efficiently completed through innovation of the receiving method, and has important significance for safe shield receiving in karst regions.
Disclosure of Invention
In view of the defects in the prior art, the invention provides the shield safe receiving channel in the karst and the shield tunnel construction method, and aims to solve the problem of difficulty in shield receiving, karst exploration and treatment in karst regions and avoid the risk of shield receiving caused by karst development.
In order to achieve the purpose, the invention discloses a shield safe receiving channel in karst, which is arranged in a shield receiving working well; the shield tunnel connecting structure comprises an interface ring beam which is arranged on the side wall of the shield receiving working well and corresponds to the entering position of a shield tunnel formed by shield construction;
a bamboo-cut receiving channel which takes grid sprayed concrete as a stress system is arranged at the outer side of the side wall of the shield receiving working well and corresponds to the position of the interface ring beam;
the cross section of one end of the bamboo-cut receiving channel, which is close to the shield receiving working well, is in a full ring shape, the cross section of the other end of the bamboo-cut receiving channel, which is far away from the shield receiving working well, is in a semi-ring shape, and the semi-ring shape is completely positioned above the horizontal plane where the axis of the bamboo-cut receiving channel is positioned;
the bamboo-cut receiving channel is provided with an end wall facing the entering direction of the shield;
the end wall comprises an upper half end wall which is arranged at the end part of the other end of the cut bamboo-shaped receiving channel with the semi-annular cross section, is vertical to the axis of the cut bamboo-shaped receiving channel, and a lower half end wall which is arranged between the part of the cut bamboo-shaped receiving channel with the semi-annular cross section and the part of the cut bamboo-shaped receiving channel with the full-annular cross section and forms an included angle of 120-160 degrees with one surface of the upper half end wall facing the inner side of the cut bamboo-shaped receiving channel;
a plurality of system anchor rods are arranged on the outer side wall of the bamboo-cut receiving channel above the horizontal plane where the axis is located;
a plurality of locking pin anchor rods are arranged on the part, close to the horizontal plane where the axis of the bamboo-cut receiving channel is located, of the part, with the semi-annular cross section, of the bamboo-cut receiving channel;
a pipe shed is arranged on the outward side of the upper half end wall;
a plurality of grouting pipes are arranged between the inner side of the bamboo-cut receiving channel and the outer wall of the shield tunnel, and gaps between the bamboo-cut receiving channel and the shield tunnel are filled with grouting through the grouting pipes;
and an annular end part plugging plate is arranged on the inner side of the side wall of the shield receiving working well and corresponds to a gap between the bamboo-cut receiving channel and the shield tunnel.
Preferably, the shield receiving working well is an open cut working well.
Preferably, the length of the part of the bamboo-cut-shaped receiving channel with the full-ring-shaped cross section meets the requirement of a shield safe receiving operation space and is not less than the length of the three-ring segment of the shield tunnel.
Preferably, the length of the part of the truncated bamboo-shaped receiving channel with the semi-annular cross section is set according to the rock stratum fracture angle of the end wall, namely, the lower half face of the truncated bamboo-shaped receiving channel is set outside the rock stratum fracture angle range.
Preferably, a plurality of the system anchor rods are arranged in a quincunx shape along the axial direction of the bamboo-cut receiving channel.
Preferably, the side wall of each grouting pipe is provided with a plurality of grouting holes, the grouting holes are fixed on the inner side of the bamboo-cut-shaped receiving channel through fixing parts, one end of each grouting pipe is provided with an end grout stopping and plugging plate, the other end of each grouting pipe is connected with an opening grouting guide pipe, and grout is obtained through the corresponding opening grouting guide pipe;
the diameter of each grouting pipe is 150 mm;
each grouting hole is 50 mm;
every two grouting pipes are spaced by 500 mm;
the plurality of grouting pipes are arranged in a quincunx shape.
Preferably, the end plugging plate is fixed on the side wall of the inner side of the shield receiving working well through bolts;
the side wall of the inner side of the shield receiving working well is provided with an embedded steel plate corresponding to the end plugging plate;
the embedded steel plate and the end plugging plate are provided with a plurality of matched bolt holes;
one side of the embedded steel plate, which faces the side wall of the shield receiving working well, is provided with an embedded screw hole corresponding to each bolt hole;
each bolt penetrates through the corresponding bolt hole in the embedded steel plate and the end plugging plate and is connected with the corresponding embedded screw hole.
The invention also provides a shield tunnel construction method applying the shield safe receiving channel in the karst, which comprises the following steps:
the arrangement of the Mi-shaped advanced horizontal drilling hole is as follows:
3 pieces of the upper half end wall corresponding to the bamboo-cut-shaped receiving channels are arranged above the palm surface, and 2 pieces of the lower half end wall corresponding to the bamboo-cut-shaped receiving channels are arranged below the palm surface;
drilling through the Mi-shaped advanced horizontal drilling hole, if karst exists, performing advanced drilling in the bamboo-cut receiving channel, drilling a grouting pipe, performing karst treatment, and performing shield propulsion after the treatment is finished;
after the shield enters the shield receiving working well, the gap between the bamboo-cut receiving channel and the shield tunnel is closed by the end plugging plate, and the gap between the bamboo-cut receiving channel and the shield tunnel is filled by grouting through a plurality of grouting pipes;
opening grouting holes on 3 ring pipe pieces at the front and back of the end part of the bamboo-cut receiving channel excavated by a subsurface excavation method for secondary grouting, performing secondary grouting through the grouting holes, and plugging gaps behind the pipe pieces to play a role in water plugging; and after the plugging is ensured to be compact, the temporary sealing plate is removed from the opening, and the ring beam of the hole ring is constructed.
Preferably, in the step 2, when the bamboo-cut receiving passage is excavated, the size of the excavation is enlarged by more than 20 cm than that of the shield.
Preferably, the construction process of the grid sprayed concrete of the bamboo-cut-shaped receiving channel as a stress system is as follows:
assembling steel frames through steel frame joints, spraying concrete, and then implementing one-by-one truss;
wherein, the front small guide pipe and the grouting are used as a tunnel face stabilizing measure, the small guide pipe is integrally arranged by combining the length and the interval, the steel frame is arranged once every 3 steel frames, and the length is controlled by meeting the condition that the front and back lap joints are not less than 1 meter;
the upper half end wall is outwards provided with a plurality of pipe sheds 6m in advance so as to meet the self-supporting of the tunnel face, and 30cm of concrete is sprayed on the upper half end wall to seal the tunnel face so as to meet the stability of the end wall.
The invention has the beneficial effects that:
the method can solve the contradiction between shield receiving and karst exploration and treatment difficulty in karst areas, avoids the risk of shield receiving caused by karst development, and economically, reasonably, safely and efficiently completes construction of the shield tunnel in karst areas.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows an overall layout of an embodiment of the present invention.
FIG. 2 is a plan view of a half-ring cross-section bamboo-cut receiving channel according to an embodiment of the present invention.
FIG. 3 illustrates an elevational view of a bamboo-cut receiving channel in accordance with an embodiment of the present invention.
Fig. 4 is a schematic view illustrating an outward view port direction of a shield receiving working well according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a direction of a shield receiving working well facing a working well viewport in an embodiment of the invention.
FIG. 6 is a plan view of a full circle cross-section bamboo-skived receiving channel in accordance with an embodiment of the present invention.
FIG. 7 shows a longitudinal cross-sectional view of a bamboo-cut receiving channel in an embodiment of the invention.
FIG. 8 shows a cross-sectional view of a full annulus of a bamboo-cut receiving channel in an embodiment of the invention.
FIG. 9 shows a cross-sectional view of an annular portion of a bamboo-cut receiving channel plate in accordance with an embodiment of the present invention.
FIG. 10 shows a cross-sectional view of a full ring portion of a bamboo-cut receiving channel in accordance with an embodiment of the present invention.
FIG. 11 shows a cross-sectional view of the ring portion of the bamboo-cut receiving channel plate in accordance with an embodiment of the present invention.
Fig. 12 shows a schematic view of a system anchor arrangement in an embodiment of the invention.
Fig. 13 is a diagram illustrating an arrangement of forepoling of a bamboo-cut receiving tunnel according to an embodiment of the present invention.
FIG. 14 is a sectional view showing the arrangement of the grouting pipes according to an embodiment of the present invention.
FIG. 15 shows a schematic view of the grouting pipe fixation according to an embodiment of the present invention.
FIG. 16 is a partially enlarged view of a grouting pipe according to an embodiment of the present invention.
Fig. 17 is a schematic diagram illustrating the position of the plugging steel plate in an embodiment of the invention.
Fig. 18 is a schematic partial cross-sectional view illustrating the shield receiving working well being provided with embedded steel plates according to an embodiment of the present invention.
Fig. 19 is a partially enlarged schematic view of an embedded steel plate according to an embodiment of the present invention.
Fig. 20 is a partial cross-sectional schematic view of a plugging steel plate mounting structure according to an embodiment of the invention.
Fig. 21 is a partially enlarged schematic view of a plugging steel plate according to an embodiment of the present invention.
Figure 22 is a schematic cross-sectional view of a shield advancing into a skived bamboo receiving tunnel in accordance with an embodiment of the present invention.
Figure 23 shows a schematic cross-sectional view of a shield advancing into a shield receiving well in an embodiment of the present invention.
Fig. 24 is a schematic cross-sectional view showing a structure of a grouting filling between the shield tunnel and the bamboo-cut receiving passage according to an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 to 14, and fig. 17 and 24, a shield safe receiving channel in karst is arranged in a shield receiving working well 1; the shield tunnel comprises an interface ring beam 4 which is arranged on the side wall of a shield receiving working well 1 and corresponds to the position where a shield tunnel 3 formed by the construction of a shield 2 enters;
a bamboo-cut receiving channel 5 which takes grid sprayed concrete as a stress system is arranged at the outer side of the side wall of the shield receiving working well 1 and corresponds to the position of the interface ring beam 4;
the cross section of one end of the bamboo-cut receiving channel 5 close to the shield receiving working well 1 is a full ring 6, the cross section of the other end far away from the shield receiving working well 1 is a semi-ring 7, and the semi-ring 7 is completely positioned above the horizontal plane where the axis of the bamboo-cut receiving channel 5 is positioned;
the bamboo-cut receiving channel 5 is provided with an end wall facing the entering direction of the shield 2;
the end wall comprises an upper half end wall 8 which is arranged at the end part of the other end of the cut bamboo-shaped receiving channel 5 with the semi-annular cross section 7 and is vertical to the axis of the cut bamboo-shaped receiving channel 5, and a lower half end wall which is arranged between the part of the cut bamboo-shaped receiving channel 5 with the semi-annular cross section 7 and the part of the cut bamboo-shaped receiving channel 5 with the full annular cross section 6 and forms an included angle of 120-160 degrees with one surface of the upper half end wall 8 facing the inner side of the cut bamboo-shaped receiving channel 5;
the outer side wall of the bamboo-cut-shaped receiving channel 5, which is positioned above the horizontal plane of the axis, is provided with a plurality of system anchor rods 9;
a plurality of foot-locking anchor rods 10 are arranged on the part of the cross section of the bamboo-cut receiving channel 5, which is in a semi-annular shape 7, close to the horizontal plane where the axis of the bamboo-cut receiving channel 5 is located;
a pipe shed 11 is arranged on the outward side of the upper half end wall 8;
a plurality of grouting pipes 12 are arranged between the inner side of the bamboo-cut receiving channel 5 and the outer wall of the shield tunnel 3, and gaps between the bamboo-cut receiving channel 5 and the shield tunnel 3 are filled with grouting 13 through the plurality of grouting pipes 12;
an annular end plugging plate 14 is arranged on the inner side of the side wall of the shield receiving working well 1 corresponding to a gap between the bamboo-cut receiving channel 5 and the shield tunnel 3.
The principle of the invention is as follows:
through setting up and cutting bamboo shape undercut passageway, through taking effective in-hole processing measure, receive in the longitudinal channel that turns into the risk controllable with the latent karst risk behind the working well. In the implementation sequence, a shield working well is constructed firstly, generally, open excavation method construction is adopted, a shield tunnel is constructed from an originating well to the working well in a pushing mode, meanwhile, a bamboo-cut underground excavation channel is constructed to serve as a receiving channel, and the end part of the channel is plugged through advanced measures and end plugs, so that the safety of an end wall is ensured; and performing advanced geological drilling in the channel to ensure that the receiving section has no karst risk. When the shield is pushed to arrive, the shield enters the working well through the bamboo-cut undercut channel to complete the safe receiving of the shield.
In practical application, the structure of the bamboo-cut receiving channel 5 can meet the requirement of later-stage shield 2 excavation, the upper half end wall 8 and the lower half end wall of the bamboo-cut receiving channel 5 are two parts staggered front and back, the area of each part is reduced, the upper half end wall 8 in advance is provided with a pipe shed 11 through one outward side to ensure safety, the lower half end wall is arranged to be an inclined plane with an included angle of 120-160 degrees relative to the upper half end wall 8, and the tunnel face of the lower half end wall is arranged outside the range of rock stratum fracture angle, so that self-stability is realized.
In some embodiments, the shield-receiving well 1 is an open-cut well.
In some embodiments, the length of the part of the bamboo-cut receiving channel 5 with the cross section of the full ring shape 6 meets the requirement of the shield 2 on safe receiving operation space and is not less than the length of the three-ring segment of the shield tunnel 3.
In some embodiments, the length of the portion of the truncated bamboo-shaped receiving channel 5 having the semi-circular cross-section 7 is set according to the end wall rock burst angle, i.e., the lower half face of the truncated bamboo-shaped receiving channel 5 is set outside the range of the rock burst angle.
In some embodiments, the system anchors 9 are arranged in a quincunx arrangement axially along the bamboo-cut receiving channel 5.
As shown in fig. 14 to 16, in some embodiments, each grouting pipe 12 has a plurality of grouting holes 15 on its sidewall, and is fixed inside the bamboo-cut receiving channel 5 by a fixing member 16, and has an end stop sealing plate 17 at one end and an opening grouting pipe 17 at the other end, and the grouting is obtained through the corresponding opening grouting pipe 17;
the diameter of each grouting pipe 12 is 150 mm;
each grouting hole is 50 mm;
every two grouting pipes 12 are spaced by 500 mm;
the plurality of grouting pipes 12 are arranged in a quincunx shape.
As shown in fig. 17 to 24, in some embodiments, the end closure plate 14 is secured to the sidewall inside the shield receiving working well 1 by bolts 18;
the side wall of the inner side of the shield receiving working well 1 is provided with an embedded steel plate 19 corresponding to the corresponding end plugging plate 14;
the embedded steel plate 19 and the end plugging plate 14 are both provided with a plurality of matched bolt holes 20;
one surface of the embedded steel plate 19, which faces the side wall side of the shield receiving working well 1, is provided with embedded screw holes 21 corresponding to each bolt hole 20;
each bolt 18 passes through a corresponding bolt hole 20 on the embedded steel plate 19 and the end plugging plate 14 and is connected with a corresponding embedded bolt hole 21.
As shown in fig. 22 to 24, the present invention further provides a shield tunnel 3 construction method using the shield safe receiving channel in karst, including the following steps:
the arrangement of the Mi-shaped advanced horizontal drilling holes is as follows:
3 corresponding to the upper part of the palm surface of the upper half end wall 8 of the bamboo-cut-shaped receiving channel 5 and 2 corresponding to the lower part of the palm surface of the lower half end wall of the bamboo-cut-shaped receiving channel 5;
drilling by a Mi-shaped advanced horizontal drilling hole, if karst exists, performing advanced drilling in the bamboo-cut receiving channel 5, arranging a grouting pipe 12, performing karst treatment, and advancing the shield 2 after the treatment is finished;
after the shield 2 enters the shield receiving working well 1, a gap between the bamboo-cut receiving channel 5 and the shield tunnel 3 is closed by an end blocking plate 14, and the gap between the bamboo-cut receiving channel 5 and the shield tunnel 3 is filled with grouting 13 through a plurality of grouting pipes 12;
opening grouting holes 15 on front and rear 3 ring pipe pieces at the end part of a bamboo-cut receiving channel 5 excavated by a subsurface excavation method for secondary grouting, performing secondary grouting through the grouting holes, and plugging gaps behind the pipe pieces to play a role in water plugging; and after the plugging is ensured to be compact, the temporary sealing plate is removed from the opening, and the ring beam of the hole ring is constructed.
In practical application, 3 rings of pipe pieces are arranged at the front and the back of the end part of the underground excavation channel, the grouting holes 15 are opened for secondary grouting, the back of the pipe piece is guaranteed to be dense, and the underground water channel is blocked.
In some embodiments, in step 2, the size of the excavation is enlarged by more than 20 cm compared to the shield 2 when the excavation is cut into bamboo shapes to receive the pipe.
In practical application, the technical means can be convenient for the shield 2 to be pushed to the working well and smoothly enter the bamboo-cut receiving channel.
As shown in fig. 13, in some embodiments, the construction process of spraying concrete on the grid of the bamboo-cut receiving channel 5 as a stress system is as follows:
assembling steel frames through steel frame joints 23, spraying concrete, and then implementing one-by-one truss;
wherein, the advanced small conduit 22 and grouting are used as a tunnel face stabilizing measure, the small conduit 22 is integrally arranged by combining the length and the interval, and the length is once built for every 3 steel frames, so that the control of the front and back lap joints of the small conduit 22 and the grouting is not less than 1 meter;
the upper half end wall 8 is provided with pipe sheds 11 with the length of 6m beyond the front towards the outside so as to meet the self-standing of the tunnel face, and the upper half end wall 8 is sprayed with 30cm of concrete to close the tunnel face so as to meet the stability of the end wall.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The shield safety receiving channel in the karst is arranged in the shield receiving working well (1); the shield tunnel is characterized by comprising an interface ring beam (4) which is arranged on the side wall of the shield receiving working well (1) and corresponds to the position where a shield tunnel (3) formed by the construction of a shield (2) enters;
a bamboo-cut receiving channel (5) which takes grid sprayed concrete as a stress system is arranged at the outer side of the side wall of the shield receiving working well (1) and corresponds to the position of the interface ring beam (4);
the cross section of one end, close to the shield receiving working well (1), of the bamboo-cutting receiving channel (5) is in a full ring shape (6), the cross section of the other end, far away from the shield receiving working well (1), of the bamboo-cutting receiving channel is in a semi-ring shape (7), and the semi-ring shape (7) is completely located above the horizontal plane where the axis of the bamboo-cutting receiving channel (5) is located;
the bamboo-cut receiving channel (5) is provided with an end wall facing the entering direction of the shield (2);
the end wall comprises an end part arranged at the other end of the cut bamboo-shaped receiving channel (5) with the cross section of a semi-ring shape (7), an upper half end wall (8) vertical to the axis of the cut bamboo-shaped receiving channel (5), and a lower half end wall which is arranged between a part of the cut bamboo-shaped receiving channel (5) with the cross section of the semi-ring shape (7) and a part of the cut bamboo-shaped receiving channel (6) with the cross section of the full ring shape (6) and forms an included angle of 120-160 degrees with one surface of the upper half end wall (8) facing the inner side of the cut bamboo-shaped receiving channel (5);
a plurality of system anchor rods (9) are arranged on the outer side wall of the bamboo-cut-shaped receiving channel (5) above the horizontal plane where the axis is located;
a plurality of foot locking anchor rods (10) are arranged on the part, close to the horizontal plane where the axis of the bamboo-cutting receiving channel (5) is located, of the part, with the semi-annular cross section (7), of the bamboo-cutting receiving channel (5);
a pipe shed (11) is arranged on the outward side of the upper half end wall (8);
a plurality of grouting pipes (12) are arranged between the inner side of the bamboo-cut-shaped receiving channel (5) and the outer wall of the shield tunnel (3), and gaps between the bamboo-cut-shaped receiving channel (5) and the shield tunnel (3) are filled with grouting (13) through the plurality of grouting pipes (12);
and an annular end plugging plate (14) is arranged on the inner side of the side wall of the shield receiving working well (1) corresponding to a gap between the bamboo-cut receiving channel (5) and the shield tunnel (3).
2. The shield safe receiving passage in karst according to claim 1, characterized in that the shield receiving working well (1) is an open cut working well.
3. The shield safe receiving channel in karst according to claim 1, characterized in that the length of the part of the bamboo-cut receiving channel (5) with the cross section of full ring shape (6) meets the requirement of shield (2) safe receiving operation space and is not less than the length of the three-ring segment of the shield tunnel (3).
4. The shield safe receiving channel in karst according to claim 1, characterized in that the length of the part of the cross section of the bamboo-cut receiving channel (5) with the semi-ring shape (7) is set according to the end wall rock stratum fracture angle, namely, the lower half face of the bamboo-cut receiving channel (5) is set outside the rock stratum fracture angle range.
5. The shield-safe receiving channel in karst according to claim 1, characterized in that several of the system anchors (9) are arranged in a quincunx along the axial direction of the bamboo-cut receiving channel (5).
6. The shield safety receiving channel in karst according to claim 1, characterized in that the side wall of each grouting pipe (12) is provided with a plurality of grouting holes (15), each grouting hole is fixed on the inner side of the bamboo-cut receiving channel (5) through a fixing part (16), one end of each grouting pipe is provided with an end grout stop plugging plate (17), the other end of each grouting pipe is connected with an opening grouting guide pipe (17), and grout is obtained through the corresponding opening grouting guide pipe (17);
each grouting pipe (12) has a diameter of 150 mm;
each grouting hole (15) is 50 mm;
every two grouting pipes (12) are spaced by 500 mm;
the plurality of grouting pipes (12) are arranged in a quincunx shape.
7. The shield safe receiving channel in karst according to claim 1, characterized in that the end closure plate (14) is fixed to the side wall inside the shield receiving working well (1) by means of bolts (18);
the side wall of the inner side of the shield receiving working well (1) is provided with an embedded steel plate (19) corresponding to the end plugging plate (14);
the embedded steel plate (19) and the end plugging plate (14) are respectively provided with a plurality of matched bolt holes (20);
one side, facing the side wall of the shield receiving working well (1), of the embedded steel plate (19) is provided with embedded screw holes (21) corresponding to each bolt hole (20);
each bolt (18) penetrates through the corresponding bolt hole (20) in the embedded steel plate (19) and the end plugging plate (14) and is connected with the corresponding embedded bolt hole (21).
8. The shield tunnel (3) construction method applying the shield safe receiving channel in karst as claimed in claim 1, characterized by comprising the steps of:
step 1, constructing the shield receiving working well (1), and reserving the position of the interface ring beam (4) according to the size of the bamboo-cut receiving channel (5) during construction;
step 2, excavating the bamboo-cut receiving channel (5), the corresponding upper half end wall (8), lower half end wall, a plurality of system anchor rods (9), a plurality of locking anchor rods (10) and a pipe shed (11) by adopting a subsurface excavation method;
step 3, advancing the shield (2), and drilling a meter-shaped advanced horizontal drilling hole when the distance from the shield to the bamboo-cut receiving channel (5) is 50 meters, wherein the drilling hole length is 30m and is used for exploring the surrounding rock condition in front;
the arrangement of the Mi-shaped advanced horizontal drilling holes is as follows:
3 corresponding to the upper half end wall (8) of the bamboo-cut-shaped receiving channel (5) are arranged above the palm surface, and 2 corresponding to the lower half end wall of the bamboo-cut-shaped receiving channel (5) are arranged below the palm surface;
drilling through the Mi-shaped advanced horizontal drilling hole, if karst exists, performing advanced drilling in the bamboo-cut receiving channel (5), drilling a grouting pipe (12), performing karst treatment, and advancing the shield (2) after the treatment is finished;
step 4, the shield (2) is pushed to the bamboo-cut receiving channel (5), segments of the shield (2) are assembled while being pushed without stopping until the shield is pushed to the shield receiving working well (1);
after the shield (2) enters the shield receiving working well (1), closing a gap between the bamboo-cut receiving channel (5) and the shield tunnel (3) by using the end plugging plate (14), and grouting and filling (13) the gap between the bamboo-cut receiving channel (5) and the shield tunnel (3) through a plurality of grouting pipes (12);
opening grouting holes (15) on 3 ring pipe pieces at the front and back of the end part of the bamboo-cut receiving channel (5) excavated by a subsurface excavation method for secondary grouting, performing secondary grouting through the grouting holes, and plugging gaps behind the pipe pieces to play a role in water plugging; and after the plugging is ensured to be compact, the temporary sealing plate is removed from the opening, and the ring beam of the hole ring is constructed.
9. The shield tunnel (3) construction method using the shield (2) safe receiving passage in the karst according to claim 8, wherein in the step 2, the size of excavation is enlarged more than 20 cm than the shield (2) when the bamboo-cut receiving passage is excavated.
10. The shield tunnel (3) construction method applying the shield (2) safety receiving channel in the karst according to the claim 8, characterized in that the construction process of the grid sprayed concrete of the bamboo-cut receiving channel (5) as a stress system is as follows:
firstly, assembling steel frames through steel frame joints (23), then spraying concrete, and then implementing one-by-one;
the front small guide pipes (22) and grouting are used as a tunnel face stabilizing measure, the small guide pipes (22) are integrally arranged in combination with the length and the space, the steel frames are arranged once every 3 steel frames, and the length is controlled to meet the condition that the front and back lap joints are not less than 1 meter;
last half headwall (8) outwards some set up the foreward pipe shed (11)6m to satisfy the self-reliance of face, just last half headwall (8) spray 30cm concrete closed face, in order to satisfy headwall stability.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210614805.XA CN114876476A (en) | 2022-06-01 | 2022-06-01 | Shield safe receiving channel in karst and shield tunnel construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210614805.XA CN114876476A (en) | 2022-06-01 | 2022-06-01 | Shield safe receiving channel in karst and shield tunnel construction method |
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| CN114876476A true CN114876476A (en) | 2022-08-09 |
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