CN211422668U - Open-type TBM's assembled steel-pipe piece of strutting - Google Patents
Open-type TBM's assembled steel-pipe piece of strutting Download PDFInfo
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- CN211422668U CN211422668U CN201922441700.5U CN201922441700U CN211422668U CN 211422668 U CN211422668 U CN 211422668U CN 201922441700 U CN201922441700 U CN 201922441700U CN 211422668 U CN211422668 U CN 211422668U
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Abstract
The utility model discloses a steel-pipe piece structure is strutted to open-type TBM's assembled, this assembled annular steel pipe piece divide into the multiple ring, and every ring steel pipe piece comprises ribbed steel shell structure, adopts bolted connection between the annular steel pipe piece. The steel pipe sheet panel and the ribbed slab are provided with reserved holes, grouting holes, bolt holes, anchor rod holes, drain holes and the like can be arranged, anchor rod or prestressed anchor rod supporting and grouting are carried out through the reserved holes, and advanced steel perforated pipes are grouted if necessary, so that the assembled closed supporting construction method for the open TBM tunnel is formed. The structure solves the problem that shield tail exposed surrounding rock cannot be closed in time in an open type TBM construction method, provides high-rigidity and fully-closed supporting conditions for the broken surrounding rock exposed from the shield tail quickly, increases the bearing capacity of the supporting shoe, improves the TBM tunneling efficiency, has high supporting structure safety, various post-treatment measures combined with anchor spraying and supporting, and has good adaptability and high reliability to unfavorable geology such as gushing water, fault broken zones, rock burst and the like.
Description
Technical Field
The utility model relates to a tunnel primary support structure of open-type TBM tunnelling worker method, especially an open-type TBM's assembled support steel-pipe piece is applicable to the tunnel primary support structure of unfavorable geological conditions such as gushing water, rockburst and fault broken zone suddenly.
Background
The construction method of the open-type TBM has the advantages that the shield is short in length, and surrounding rock behind the shield tail is empty, so that the anchoring and shotcreting support can be conveniently carried out by combining a new Austrian method. Meanwhile, because the rock mass behind the shield tail is directly exposed, the surrounding rock instability risk is also large, particularly when the open-type TBM passes through unfavorable geological tunnel sections such as fault broken zones, gushing water, and rock burst, the underground water washing and wrapping effect is strong, the surrounding rock is broken unstably, even large-range slag sliding, block falling and collapse occur, the bearing capacity of the boot supporting part is often difficult to meet the requirements, huge safety threat is caused to on-site people, machines and equipment, the TBM crossing and interference processes are increased, the tunneling efficiency is obviously reduced, the additional labor and cost are also increased, and the advantages of the open-type TBM such as high efficiency, safety and rapidness are difficult to exert. Therefore, the work efficiency improvement scheme of the open-type TBM passing through the unfavorable geological tunnel section becomes an important factor for restricting the safety, progress and investment of the tunnel project, and the shield tail quick closed supporting scheme of the open-type TBM is an important way for effectively solving the problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a steel-pipe piece is strutted to open-type TBM's assembled is provided, is applicable to open-type TBM and passes through the tunnel initial stage supporting construction of unexpected geology hole sections such as gushing water, rockburst and broken area of fault, can seal open-type TBM shield afterbody unstability rock face fast to effectively combine current anchor to spout the supporting technology.
In order to solve the above problem, the utility model discloses the technical scheme who adopts is: the assembled supporting steel pipe piece of the open type TBM is of an arc ribbed steel shell structure and comprises an arc steel shell, a plurality of annular rib plates and a plurality of longitudinal rib plates, wherein the annular rib plates and the longitudinal rib plates are arranged on the inner side of the arc surface of the arc steel shell, the two longitudinal rib plates on the edge and the two annular rib plates on the edge surround the arc steel shell and are welded into a whole, the inner longitudinal rib plates are vertically welded on the walls of the two adjacent annular rib plates, the bottom surface of the inner longitudinal rib plate is welded on the inner wall of the arc steel shell, a plurality of reserved holes for inserting a grouting anchor rod and a leading steel flower pipe are formed in the arc steel shell, a plurality of bolt holes are formed in the two longitudinal rib plates on the edge and the two annular rib plates on the edge, and the assembled supporting steel pipe piece is assembled into an annular supporting structure by screwing bolts into the bolt holes in the two.
The thickness of the arc-shaped steel shell is 0.2-2 cm, the height of the annular rib plate and the height of the longitudinal rib plate are 5-15 cm, the thickness of the longitudinal rib plate is 0.2-0.5 cm, and the annular rib plate and the longitudinal rib plate are the same in height.
The preformed hole is oval.
The assembled supporting steel pipe sheet and spray anchor combined supporting method of the open TBM comprises the following steps:
A. according to design parameters, selecting an assembled supporting steel pipe sheet, enabling the outer side of an arc-shaped steel shell of the supporting steel pipe sheet to be arranged in a manner of being tightly attached to a rock wall, enabling a circumferential rib plate and a longitudinal rib plate to be close to one side in a hole, and firmly welding the arc-shaped steel shell, the circumferential rib plate and the longitudinal rib plate to form an integral stress structure;
B. mounting 360-degree full-section supporting steel pipe pieces in an open type TBM shield tail through an installer, sealing the exposed rock surface of the shield tail, tightly attaching an arc-shaped steel shell to the rock surface, and connecting the supporting steel pipe pieces through bolts;
C. filling a reserved space between the circumferential rib plate and the longitudinal rib plate by adopting sprayed concrete at the inner side of the supporting steel pipe sheet, so that the supporting steel pipe sheet and the sprayed concrete form an integral stress structure;
D. and drilling a hollow grouting anchor rod along the radius direction through a preformed hole on the arc-shaped steel shell, and reinforcing the surrounding rock by grouting the anchor rod.
The method further comprises the step of drilling an advanced steel perforated pipe forwards along the axis direction of the hole through the preformed hole, and simultaneously spraying concrete again, wherein the included angle between the advanced steel perforated pipe and the axis direction of the hole is in the range of 5-15 degrees, so that the advanced reinforcement range is guaranteed.
And in the high outer water hole section, a radial capillary drainage hole is drilled in a preformed hole at the top, so that the outer water pressure of the lining is reduced.
The leading steel perforated pipe is driven in a multi-piece crossed mode, and the annular grouting reinforcement effect is guaranteed.
The tail ends of the grouting anchor rod and the leading steel perforated pipe are provided with gaskets, and the gaskets are welded with the arc-shaped steel shell to ensure the overall performance.
The utility model has the advantages that: the problem that the open-type TBM cannot timely close shield tail exposed surrounding rocks is solved, a high-rigidity fully-closed supporting condition is quickly provided for the shield tail exposed broken surrounding rocks, the tunnel is particularly suitable for tunnel sections such as high-ground-stress rock burst, water inrush and fault broken zones, the ductility of a steel structure relative to a spray anchor supporting structure and a concrete lining structure is better, the tunnel can adapt to the larger surrounding rock deformation condition, the surrounding rock deformation can be fully released, the self bearing capacity of the surrounding rocks is exerted, the supporting load is reduced, the integrity of the surrounding rock bearing structure is guaranteed, and the problems that the deeply-buried TBM tunnel collapses in a large range, slag is discharged in a large amount, even the TBM is blocked and the like due to local collapse and falling blocks of the surrounding rocks are solved.
Drawings
Fig. 1 is the structural schematic diagram of the assembled supporting steel pipe sheet of the open-type TBM.
Fig. 2 is a schematic structural diagram of an assembled supporting steel pipe sheet of the open-type TBM and a combined supporting method of the assembled supporting steel pipe sheet and the shotcrete.
Detailed Description
The invention will be described in further detail with reference to the following drawings and embodiments:
as shown in figure 1, the assembled supporting steel pipe sheet of the open type TBM of the utility model is an arc ribbed steel shell structure, and comprises an arc steel shell 1, a plurality of circumferential rib plates 2 and a plurality of longitudinal rib plates 3 which are arranged at the inner side of the arc surface of the arc steel shell, two longitudinal rib plates 3 at the edge and two circumferential rib plates 2 at the edge are enclosed around the arc steel shell 1 and are welded into a whole, the inner longitudinal rib plates 3 are vertically welded on the two adjacent circumferential rib plates 2, the bottom surface is welded on the inner wall of the arc steel shell 1, a plurality of preformed holes 4 for inserting grouting anchor rods and leading steel perforated pipes are formed in the arc-shaped steel shell 1, a plurality of bolt holes 5 are formed in two longitudinal rib plates 3 of the edge portion and two circumferential rib plates 2 of the edge portion, and a plurality of assembled supporting steel pipe sheets are screwed into the bolt holes 5 in two adjacent supporting steel pipe sheets through bolts to be assembled into an annular supporting structure.
The thickness of the arc-shaped steel shell 1 is 0.2-2 cm, the height of the annular rib plate 2 and the height of the longitudinal rib plate 3 are 5-15 cm, the thickness of the longitudinal rib plate is 0.2-0.5 cm, and the height of the annular rib plate 2 is the same as that of the longitudinal rib plate 3. The preformed hole 4 is oval.
As shown in fig. 2, the utility model discloses an open-type TBM's assembled support steel-pipe piece and spray anchor combined support method, includes following steps:
A. according to design parameters, selecting an assembled supporting steel pipe piece, enabling the outer side of an arc-shaped steel shell 1 of the supporting steel pipe piece to be arranged in a manner of being tightly attached to a rock wall, enabling a circumferential rib plate 2 and a longitudinal rib plate 3 to be close to one side in a hole, and firmly welding the arc-shaped steel shell 1, the circumferential rib plate 2 and the longitudinal rib plate 3 to form an integral stress structure;
B. mounting 360-degree full-section supporting steel pipe pieces in an open type TBM shield tail through an installer, sealing the exposed rock surface of the shield tail, tightly attaching an arc-shaped steel shell 1 to the rock surface, and connecting the supporting steel pipe pieces through bolts;
C. filling a reserved space between the annular rib plate 2 and the longitudinal rib plate 3 by adopting sprayed concrete 6 on the inner side of the supporting steel pipe sheet to enable the supporting steel pipe sheet and the sprayed concrete 6 to form an integral stress structure;
D. through preformed hole 4 on the arc steel casing 1, establish cavity slip casting stock 7 along the radial direction brill, consolidate peripheral country rock through the stock slip casting.
Still include through preformed hole 4 along the forward advance steel floral tube 8 of setting up of hole axis direction, at the same time spout concrete again, advance steel floral tube and hole axis direction contained angle are in 5 ~ 15 scopes, guarantee advance reinforcement scope.
And in the high outer water hole section, a radial capillary permeable drainage hole is drilled in the preformed hole 4 at the top, so that the outer water pressure of the lining is reduced.
The leading steel perforated pipe 8 is driven in a multi-piece crossed mode, and the annular grouting reinforcement effect is guaranteed.
The back ends of the grouting anchor rod 7 and the advanced steel perforated pipe 8 are provided with gaskets, and the gaskets are welded with the arc-shaped steel shell 1, so that the overall performance is ensured.
Specifically, prefabricating and processing of the assembled supporting steel pipe sheet outside the hole is completed, assembling operation is carried out in the shield tail of the open type TBM shield in the hole through an installer, the arc-shaped steel shell 1 is arranged to be tightly attached to the rock wall, the annular rib plate 2 and the longitudinal rib plate 3 are arranged on one side close to the inner side of the hole, the annular steel pipe sheet is connected through bolts through the reserved holes 5 in the rib plate, and the steel pipe sheet is guaranteed to form an integral stress structure.
After the supporting steel pipe piece is assembled, 5 cm-10 cm of primary sprayed concrete 6 construction is carried out according to the on-site surrounding rock stability and safety monitoring conditions, an anchor rod 7 is drilled through a reserved hole, and bean gravel backfilling and surrounding rock grouting reinforcement are carried out after the wall of the pipe piece, so that the overall stability of the steel pipe piece structure is enhanced.
After the assembly type supporting steel pipe sheet is subjected to primary spraying, anchor rod fixing and radial grouting reinforcement, when the assembly type supporting steel pipe sheet passes through a water inrush tunnel section, drilling of a small advanced guide pipe or an advanced steel perforated pipe 8 and selection of advanced grouting reinforcement materials are carried out within the range of 180 degrees of the tunnel top according to the situation, so that the TBM is ensured not to generate larger escaping resistance due to grouting, and meanwhile, concrete 6 is sprayed again to further reinforce the primary supporting structure. And in the high outer water tunnel section, by combining the analysis and design of the water blocking and draining measures of the lining, radial capillary water penetration and drainage holes are drilled in the preformed hole 4 at the top, so that the outer water pressure of the lining is reduced.
The utility model discloses adopt bolted connection between the section of jurisdiction, can realize assembling fast in the hole and fix, avoid unstable rock mass to expose to reduce swift current sediment, fall the piece and collapse, and weaken washing away of groundwater and wrap up in the clamp effect, reduce and fall the piece because of unfavorable geology, the collapse of rock burst hole section and cause man-machine safety risk, scarfing cinder operation etc. simplify the operation process of strutting in L1 district of open-type TBM simultaneously, reduce TBM step changing time, increase TBM tunnelling efficiency. The sprayed concrete structure can be bonded with the steel shell, the ribbed plates, the anchor rods and the steel ribbed plates to form a whole, the rock mass around the tunnel after being reinforced by advanced grouting and radial grouting can provide better supporting conditions for the supporting structure, the problem of insufficient bearing capacity of the shoe supporting part is solved, and conditions are created for efficient and safe tunneling of the open TBM in the tunnel section with poor geology. The high compressive strength of the sprayed concrete can be fully utilized to bear the large compressive stress on the inner side, the steel shell coated outside the sprayed concrete can fully exert the high tensile property, the good ductility and the good impact toughness of the sprayed concrete, can adapt to the large deformation of the surrounding rock, fully release the deformation of the surrounding rock, exert the self bearing capacity of the surrounding rock, reduce the supporting load and simultaneously ensure the integrity of the bearing structure of the surrounding rock.
The utility model discloses but steel-pipe piece is strutted to assembled and is stereotyped outside the hole and prefabricate in batches, and the assembled technology seals the rock face fastly, and degree of mechanization is high to improve the whole bearing capacity of country rock, improve and prop boots position and support intensity, guarantee broken area of fault, gush water suddenly, the continuous tunnelling of country rock stability and TBM of unfavorable geology hole sections such as rockburst. When the extrusion large deformation, rock burst of more than medium grade or water seepage around the hole are predicted, reinforcing measures such as nano-fiber sprayed concrete, prestressed anchor rods, heavy steel pipes and the like can be adopted, so that the adaptive deformation capability and impact toughness of the supporting structure are improved.
The above-mentioned embodiments are only used for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, the scope of the present invention should not be limited by the embodiment, that is, all equivalent changes or modifications made by the spirit of the present invention should still fall within the scope of the present invention.
Claims (3)
1. The utility model provides an open-type TBM's assembled steel-pipe piece of strutting, a serial communication port, the assembled steel-pipe piece of strutting is arc ribbed steel shell structure, including arc steel shell (1), set up a plurality of hoop floor (2) and a plurality of longitudinal rib board (3) at arc steel shell cambered surface inboard, two longitudinal rib boards (3) of limit portion and two hoop floor (2) of limit portion enclose around arc steel shell (1), weld into a whole, inside longitudinal rib board (3) vertical welding is on two adjacent hoop floor (2) walls, the bottom surface welding is on the inner wall of arc steel shell (1), it has a plurality of preformed holes (4) that are used for inserting slip casting stock and leading steel floral tube to open on arc steel shell (1), open on two longitudinal rib boards (3) of limit portion and two hoop floor (2) of limit portion have a plurality of bolt holes (5), the annular of bolt hole (5) that the bolt is twisted on two adjacent steel-pipe pieces and is strutted to the steel-pipe piece is strutted to multi-disc assembled steel-pipe piece through the bolt And (5) structure.
2. The assembled supporting steel pipe sheet of the open type TBM according to claim 1, wherein the thickness of the arc-shaped steel shell (1) is 0.2-2 cm, the height of the circumferential rib plate (2) and the height of the longitudinal rib plate (3) are 5-15 cm and 0.2-0.5 cm, and the circumferential rib plate (2) and the longitudinal rib plate (3) have the same height.
3. The fabricated supporting steel pipe sheet of an open type TBM according to claim 1, wherein the prepared hole (4) is oval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922441700.5U CN211422668U (en) | 2019-12-27 | 2019-12-27 | Open-type TBM's assembled steel-pipe piece of strutting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922441700.5U CN211422668U (en) | 2019-12-27 | 2019-12-27 | Open-type TBM's assembled steel-pipe piece of strutting |
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| CN211422668U true CN211422668U (en) | 2020-09-04 |
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| CN201922441700.5U Active CN211422668U (en) | 2019-12-27 | 2019-12-27 | Open-type TBM's assembled steel-pipe piece of strutting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983470A (en) * | 2021-05-11 | 2021-06-18 | 北京中矿创新联盟能源环境科学研究院 | TBM (Tunnel boring machine) supporting system and method for soft rock tunnel |
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2019
- 2019-12-27 CN CN201922441700.5U patent/CN211422668U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983470A (en) * | 2021-05-11 | 2021-06-18 | 北京中矿创新联盟能源环境科学研究院 | TBM (Tunnel boring machine) supporting system and method for soft rock tunnel |
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