CN112901203A - Reinforcing structure and reinforcing method for peripheral stratum of shield and pipe-jacking tunnel - Google Patents
Reinforcing structure and reinforcing method for peripheral stratum of shield and pipe-jacking tunnel Download PDFInfo
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- CN112901203A CN112901203A CN202010942965.8A CN202010942965A CN112901203A CN 112901203 A CN112901203 A CN 112901203A CN 202010942965 A CN202010942965 A CN 202010942965A CN 112901203 A CN112901203 A CN 112901203A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 107
- 230000002093 peripheral effect Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 12
- 201000010099 disease Diseases 0.000 abstract description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 9
- 230000001603 reducing effect Effects 0.000 description 7
- 239000004576 sand Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
Abstract
The invention discloses a shield and pipe-jacking tunnel peripheral stratum reinforcing structure and a reinforcing method. This reinforced structure is under construction inside the tunnel, simple structure, and is with low costs, can not receive conditional restrictions such as ground traffic, pipeline, building structure, and can guarantee the reinforcement effect, and the effect of sinking that subtracts of the compound ground of performance root stake to avoided because the soft base consolidates the poor later stage operation tunnel that leads to of effect and subsides the emergence of disease such as increase, section of jurisdiction damage even, the normal operation in influence tunnel.
Description
Technical Field
The invention relates to the field of shield and pipe-jacking tunnel engineering, in particular to a structure and a method for reinforcing the peripheral stratum of a shield and pipe-jacking tunnel.
Background
The shield and pipe-jacking tunnel construction method is the most widely applied and important engineering technology in the current underground tunnel construction, and has the advantages of safety, rapidness, good quality control and construction environment and the like. However, in a liquefied sand layer or a soft soil layer, after the construction of a shield tunnel and a pipe-jacking tunnel is completed, the problem of earthquake liquefaction exists, the settlement amount is large during the operation, the time required for stabilization is long, and the settlement presents obvious non-uniformity, so that the tunnel has the problems of operation safety and even structural safety, and many tunnels in domestic soft and weak strata have the problems.
In shield and pipe-jacking tunnel engineering, the most conventional method for solving the problem of earthquake liquefaction and controlling long-term operation settlement in a soft soil stratum is to reinforce the soft stratum around the tunnel during construction, so the reinforcement design is always a serious difficulty in the design and construction of the shield and pipe-jacking tunnels, and particularly when the periphery of the tunnel is a soft soil and water-rich liquefied sand layer, the difficulty in how to reinforce is more a risk and quality control difficulty.
The construction method is characterized in that the soft stratum around the shield and pipe-jacking tunnel is conventionally reinforced by the ground, such as ground grouting, stirring piles, jet grouting piles and other reinforcement methods, the construction cost is high, and the tunnel generally runs under the existing municipal road or building and is limited by conditions of ground traffic, pipelines, building and the like, so that the ground reinforcement is difficult to implement under most conditions. If the in-tunnel reinforcement mode is adopted, the method has the advantages that the control of ground conditions is avoided, the manufacturing cost is controllable, the cost performance is high, the method is limited by narrow space in the tunnel, the number of in-tunnel reinforcement methods is small, a small number of projects adopt the mode of grouting reinforcement on peripheral strata in the tunnel at present, the number of grouting holes is small, the grouting pressure cannot be too large, the grouting reinforcement effect in the tunnel is poor, the inspection is difficult, and the problem of reinforcement of the peripheral strata of the tunnel is difficult to solve by the method.
Therefore, a new method for reinforcing in the tunnel is needed to be designed, which not only can meet the requirement of not damaging the stress of the segment structure, but also can ensure the reinforcing effect and control the sedimentation in the operation period so as to solve the problem of reinforcing the peripheral weak stratum by the shield and the pipe-jacking tunnel.
Disclosure of Invention
The invention aims to: aiming at a series of problems existing in the existing tunnel peripheral stratum reinforcing technology, such as the problems that the ground reinforcing mode is limited by conditions of ground traffic, pipelines, building demolition and the like, and the implementation is difficult and the manufacturing cost is high in most cases; the problem that the reinforcing effect cannot be guaranteed due to the fact that a segment structure is damaged by grouting in a tunnel is solved, and a structure and a method for reinforcing the stratum around the shield and pipe-jacking tunnel are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a structure for reinforcing the stratum around a shield and pipe-jacking tunnel comprises reinforcing piles and connecting pieces;
the connecting piece is arranged in the duct piece;
the reinforcing piles are of hollow structures, penetrate through the connecting pieces, are arranged in the peripheral stratum of the tunnel in a driving mode, and are fixedly connected with the duct pieces through the connecting pieces;
and grouting holes are formed in the pile wall of the reinforcing pile, and grouting is performed on the peripheral stratum of the tunnel through the grouting holes.
The reinforcing pile in the invention is a rigid pile.
According to the structure, after segments of the shield and the pipe-jacking tunnel are assembled, reinforcing piles are arranged on the peripheral stratum of the tunnel through connecting pieces to form a composite foundation; after the driving is finished, locking the pile head of the reinforcing pile and a connecting piece on the duct piece to ensure that the reinforcing pile and the duct piece form a structure for integrally transmitting stress; the reinforcing pile is of a hollow structure, and grouting can be performed on the stratum around the tunnel through grouting holes in the pile wall of the reinforcing pile, so that the connecting force of the pile and the stratum around the pile is increased, and the physical and mechanical properties of the stratum around the pile are improved; through the peripheral stratum combined action behind reinforcement stake and the slip casting improvement, the common play is similar to the effect of subsiding of reducing of root stake composite foundation, reach the purpose that reduces the tunnel and subside, the problem of uneven settlement during sand bed liquefaction and operation has been solved, compare with ground reinforcement mode, this reinforced structure is under construction inside the tunnel, moreover, the steam generator is simple in structure, low cost, can not receive ground traffic, the pipeline, the restriction of conditions such as building structure, and can guarantee the reinforcement effect, the effect of subsiding of reducing of performance root stake composite foundation, thereby avoided because soft base consolidates the poor later stage operation tunnel that leads to of effect and subsides the increase, even the emergence of diseases such as section of jurisdiction damage, influence the normal operation in tunnel.
As a preferable scheme of the present invention, the number of the reinforcing piles is several, and driving angles of the reinforcing piles are different. Through the structure, the corresponding quantity, pile diameter, pile length and grouting slurry types of the reinforcing piles can be formulated according to different tunnel section sizes and different weak stratum conditions.
The striking angle in the invention refers to: the reinforcing pile penetrates through an included angle between the outlet direction of the connecting piece and the tangential direction of the joint of the duct piece and the connecting piece.
In a preferred embodiment of the present invention, the connector is a steel sleeve with a valve.
A method for reinforcing the peripheral stratum of a shield and pipe-jacking tunnel comprises the following steps:
s1: when a tunnel segment is manufactured, a connecting piece is pre-embedded in a segment block; manufacturing a reinforcing pile, and reserving grouting holes on the pile wall of the reinforcing pile;
s2: after the assembly of the duct pieces is completed, each reinforcing pile sequentially penetrates through the connecting pieces on the duct pieces in the tunnel, is pushed out of the tunnel and is arranged in the peripheral stratum;
s3: and grouting and reinforcing the peripheral stratum of the tunnel through grouting holes in the reinforcing piles.
By the method, the function of the reinforcing structure can be effectively realized, the operation is convenient, and the method has a wide popularization prospect.
In a preferred embodiment of the present invention, in step S1, the connecting member is a steel sleeve, and the reinforcing pile is fixedly connected to the duct piece through the steel sleeve.
As a preferable scheme of the present invention, a valve is provided on the connecting member, and after the step S3 is completed, the valve is closed. Through the structure, the problem of subsequent water leakage is avoided.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the structure, after segments of the shield and the pipe-jacking tunnel are assembled, reinforcing piles are arranged on the peripheral stratum of the tunnel through connecting pieces to form a composite foundation; after the driving is finished, locking the pile head of the reinforcing pile and a connecting piece on the duct piece to ensure that the reinforcing pile and the duct piece form a structure for integrally transmitting stress; the reinforcing pile is of a hollow structure, and grouting can be performed on the stratum around the tunnel through grouting holes in the pile wall of the reinforcing pile, so that the connecting force of the pile and the stratum around the pile is increased, and the physical and mechanical properties of the stratum around the pile are improved; through the peripheral stratum combined action behind reinforcement stake and the slip casting improvement, the common play is similar to the effect of subsiding of reducing of root stake composite foundation, reach the purpose that reduces the tunnel and subside, the problem of uneven settlement during sand bed liquefaction and operation has been solved, compare with ground reinforcement mode, this reinforced structure is under construction inside the tunnel, moreover, the steam generator is simple in structure, low cost, can not receive ground traffic, the pipeline, the restriction of conditions such as building structure, and can guarantee the reinforcement effect, the effect of subsiding of reducing of performance root stake composite foundation, thereby avoided because soft base consolidates the poor later stage operation tunnel that leads to of effect and subsides the increase, even the emergence of diseases such as section of jurisdiction damage, influence the normal operation in tunnel.
2. By the method, the function of the reinforcing structure can be effectively realized, the operation is convenient, and the method has a wide popularization prospect.
Drawings
Fig. 1 is a schematic structural view of a method for reinforcing the peripheral strata of a shield tunnel and a pipe-jacking tunnel according to the invention, taking a three-ring pipe piece as an example.
Fig. 2 is a front view of a three-ring segment as an example of a method for reinforcing the peripheral strata of a shield tunnel and a pipe-jacking tunnel according to the invention.
Fig. 3 is a top view of a three-ring segment as an example of the method for reinforcing the peripheral strata of a shield tunnel and a pipe-jacking tunnel according to the invention.
Fig. 4 is a bottom view of a three-ring segment as an example of a method for reinforcing the peripheral strata of a shield and pipe-jacking tunnel according to the present invention.
Fig. 5 is a side view of a three-ring segment as an example of a method for reinforcing the peripheral strata of a shield and pipe-jacking tunnel according to the invention.
Icon: 1-capping a top block; 2-an abutment block; 3-standard block; 4-longitudinal seam of the pipe piece; 5-reinforcing piles; 6-connecting piece.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1-5, the present embodiment takes a three-ring tunnel segment as an example, and provides a structure for reinforcing the surrounding strata of a shield and pipe-jacking tunnel, which includes a three-ring segment, a reinforcing pile 5, and a connecting member 6;
the three-ring pipe piece comprises a standard block 3, a top sealing block 1 and an adjacent block 2, wherein the adjacent block 2 is positioned between the standard block 3 and the top sealing block 1, and the standard block 3, the top sealing block 1 and the adjacent block 2 are spliced to form a circular ring structure.
Specifically, the adjacent block 2 is connected with the standard block 3 through the longitudinal duct piece seam 4.
The duct piece standard block 3 is fixedly provided with a connecting piece 6, the connecting piece 6 is provided with a valve, and one end of the reinforcing pile 5 can be fixedly connected with the connecting piece 6; the reinforcing pile 5 is of a hollow structure, a series of grouting holes are formed in the wall of the pile, and the connecting piece 6 is a steel sleeve with a valve.
And grouting holes are formed in the pile wall of the reinforcing pile 5 and used for grouting the peripheral stratum of the tunnel.
Specifically, the reinforcing piles 5 are rigid piles, the number of the reinforcing piles 5 is a plurality of, the number of the corresponding reinforcing piles 5, the pile diameter, the pile length and the grouting slurry type can be formulated according to different tunnel section sizes and different weak stratum conditions, and the driving angle of each reinforcing pile 5 is different.
The embodiment also provides a method for reinforcing the peripheral stratum of the shield and pipe-jacking tunnel, which comprises the following steps:
s1: when a tunnel segment is manufactured, the connecting piece 6 is pre-embedded in the segment blocks; manufacturing a reinforcing pile 5, and reserving grouting holes on the pile wall of the reinforcing pile 5;
specifically, the connecting piece 6 is embedded in the standard block 3 to provide safety guarantee for the subsequent construction of the reinforcing pile 5 in the tunnel, and the connecting piece 6 is a steel sleeve with a valve;
s2: excavating the tunnel, splicing the top sealing block 1, the adjacent block 2, the standard block 3 and the segment longitudinal seam 4 to form a segment, sequentially penetrating each reinforcing pile 5 through a connecting piece 6 on the segment in the tunnel by using small equipment, pushing the reinforcing piles outwards the tunnel, and driving the reinforcing piles to the peripheral stratum;
specifically, a plurality of openings are reserved in each connecting piece 6, and a plurality of reinforcing piles 5 with different angles can be arranged on each connecting piece 6;
s3: grouting and reinforcing the stratum around the tunnel through grouting holes in the reinforcing piles 5;
specifically, after step S3 is completed, the valve at the connection point of the connecting member 6 and the reinforcing piles 5 is closed.
During tunnel construction, the duct piece standard block 3, the adjacent block 2 and the capping block 1 are spliced into a circular tunnel, and then each reinforcing pile 5 sequentially penetrates through a connecting piece 6 on a duct piece in the tunnel by using small equipment, is pushed out of the tunnel and is arranged in a peripheral stratum; after the driving is finished, the pile head of the reinforcing pile 5 is locked with the connecting piece 6 on the duct piece, so that the reinforcing pile 5 and the duct piece are ensured to form a structure for integrally transmitting stress; then grouting the stratum around the tunnel through the grouting holes in the pile wall of the reinforcing pile 5, so that the connecting force between the reinforcing pile 5 and the stratum around the tunnel is increased, and the physical and mechanical properties of the stratum around the tunnel are improved; after the grouting is finished, the valve at the connecting piece 6 is closed, and the subsequent water leakage is avoided. During specific construction, the operation mode of sectional driving and lengthening of the reinforcing piles 5 can be performed according to the length of the reinforcing piles 5 and the size of the operation space in the tunnel.
The structure and the method for reinforcing the peripheral stratum of the shield and pipe-jacking tunnel have the beneficial effects that:
after the segments of the shield and pipe-jacking tunnels are assembled, reinforcing piles 5 are arranged on the peripheral strata of the tunnels through connecting pieces 6 to form a composite foundation; after the driving is finished, the pile head of the reinforcing pile 5 is locked with the connecting piece 6 on the duct piece, so that the reinforcing pile 5 and the duct piece are ensured to form a structure for integrally transmitting stress; the reinforcing pile 5 is of a hollow structure, grouting can be performed on the peripheral stratum of the tunnel through a grouting hole in the pile wall of the reinforcing pile 5, the connecting force of the reinforcing pile 5 and the peripheral stratum is increased, and the physical and mechanical properties of the peripheral stratum are improved; through the combined action of the reinforcing piles 5 and the periphery stratum after grouting improvement, the settlement reducing effect similar to that of the root pile composite foundation is exerted together, the purpose of reducing tunnel settlement is achieved, the problems of liquefaction of a sand layer and uneven settlement during operation are solved, compared with a ground reinforcing mode, the reinforcing structure is constructed inside a tunnel, the structure is simple, the cost is low, the reinforcing structure is not limited by conditions such as ground traffic, pipelines, building structures and the like, the reinforcing effect can be ensured, the settlement reducing effect of the root pile composite foundation is exerted, and therefore the problems that settlement of the later-period operation tunnel is increased, even segments are damaged and the like due to poor reinforcing effect of a soft foundation are avoided, and normal operation of the tunnel is influenced;
by the method, the function of the reinforcing structure can be effectively realized, the operation is convenient, and the method has a wide popularization prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A structure for reinforcing the stratum around a shield and pipe-jacking tunnel is characterized by comprising reinforcing piles (5) and connecting pieces (6);
the connecting piece (6) is arranged in the pipe piece;
the reinforcing piles (5) are of hollow structures, the reinforcing piles (5) penetrate through the connecting pieces (6) to be arranged in the peripheral stratum of the tunnel, and the reinforcing piles are fixedly connected with the duct pieces through the connecting pieces (6);
and grouting holes are formed in the pile wall of the reinforcing pile (5), and grouting is performed on the peripheral stratum of the tunnel through the grouting holes.
2. The structure for reinforcing the stratum around the shield and pipe-jacking tunnel according to claim 1, wherein the number of the reinforcing piles (5) is several, and the driving angle of each reinforcing pile (5) is different.
3. The structure for reinforcing the stratum around the shield and pipe-jacking tunnel according to claim 1, wherein the connector (6) is a steel sleeve with a valve.
4. A method for reinforcing the peripheral stratum of a shield and pipe-jacking tunnel is characterized by comprising the following steps:
s1: when a tunnel segment is manufactured, the connecting piece (6) is pre-embedded in the segment block; manufacturing a reinforcing pile (5), and reserving grouting holes on the pile wall of the reinforcing pile (5);
s2: after the assembly of the duct pieces is completed, each reinforcing pile (5) sequentially penetrates through a connecting piece (6) on the duct piece in the tunnel, is pushed out of the tunnel and is arranged in the peripheral stratum;
s3: and grouting and reinforcing the peripheral stratum of the tunnel through grouting holes in the reinforcing piles (5).
5. The method for reinforcing the peripheral strata of the shield and pipe-jacking tunnel according to claim 4, wherein in the step S1, the connecting piece is a steel sleeve, and the reinforcing pile (5) is fixedly connected with the pipe piece through the steel sleeve.
6. The method for reinforcing the peripheral strata of the shield and pipe-jacking tunnels according to claim 5, wherein valves are arranged on the connecting pieces (6), and the valves are closed after the step S3 is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010942965.8A CN112901203A (en) | 2020-09-09 | 2020-09-09 | Reinforcing structure and reinforcing method for peripheral stratum of shield and pipe-jacking tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010942965.8A CN112901203A (en) | 2020-09-09 | 2020-09-09 | Reinforcing structure and reinforcing method for peripheral stratum of shield and pipe-jacking tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112901203A true CN112901203A (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010942965.8A Pending CN112901203A (en) | 2020-09-09 | 2020-09-09 | Reinforcing structure and reinforcing method for peripheral stratum of shield and pipe-jacking tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944473A (en) * | 2021-09-26 | 2022-01-18 | 中铁四局集团有限公司 | Rotary spraying construction method for increasing ductility of pile foundation of operation subway station |
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| CN203925521U (en) * | 2014-05-16 | 2014-11-05 | 中铁二院工程集团有限责任公司 | A kind of shield tunnel bottom stratum consolidation channels configuration |
| CN105756685A (en) * | 2016-05-03 | 2016-07-13 | 西南交通大学 | Segmental lining reinforcing type combined supporting structure |
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| CN108361045A (en) * | 2018-04-23 | 2018-08-03 | 同济大学 | A kind of duct pieces of shield tunnel being adapted to soft soil layer |
| CN109488334A (en) * | 2018-10-25 | 2019-03-19 | 中铁第勘察设计院集团有限公司 | Deep hole grouting reinforcement means and equipment in shield tunnel |
| CN110700853A (en) * | 2019-10-31 | 2020-01-17 | 中铁十八局集团第三工程有限公司 | Shallow soil covering shield tunnel reinforcing method based on weak stratum |
-
2020
- 2020-09-09 CN CN202010942965.8A patent/CN112901203A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103573274A (en) * | 2013-11-11 | 2014-02-12 | 浙江大学 | Steel sleeve grouting reinforcement device for settlement control over shield tunnel of soft foundation |
| CN203809012U (en) * | 2014-03-12 | 2014-09-03 | 广州地铁设计研究院有限公司 | Shield tunnel foundation base reserved grouting and processing system |
| CN203925521U (en) * | 2014-05-16 | 2014-11-05 | 中铁二院工程集团有限责任公司 | A kind of shield tunnel bottom stratum consolidation channels configuration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113944473A (en) * | 2021-09-26 | 2022-01-18 | 中铁四局集团有限公司 | Rotary spraying construction method for increasing ductility of pile foundation of operation subway station |
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Application publication date: 20210604 |