CN109779636B - Reinforcing structure for shield tunnel to penetrate through existing building - Google Patents
Reinforcing structure for shield tunnel to penetrate through existing building Download PDFInfo
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- CN109779636B CN109779636B CN201910137520.XA CN201910137520A CN109779636B CN 109779636 B CN109779636 B CN 109779636B CN 201910137520 A CN201910137520 A CN 201910137520A CN 109779636 B CN109779636 B CN 109779636B
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- existing building
- shield tunnel
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- reinforcing
- vertical supporting
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 40
- 239000002689 soil Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 18
- 230000002787 reinforcement Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 12
- 239000004576 sand Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000009424 underpinning Methods 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the technical field of tunnel construction structures, in particular to a reinforcing structure for a shield tunnel to penetrate through an existing building. The vertical support structure is positioned at two lateral sides of the existing building, and the lateral support structure is positioned between the existing building and the shield tunnel; the vertical supporting structure is a pile foundation structure inserted into soil bodies at two lateral sides of a traveling route of the shield tunnel; the two ends of the transverse supporting structure are fixed on the vertical supporting structures at two sides to form a portal structure for supporting the existing building, and a tensioning structure for transversely tensioning the transverse supporting structure is arranged between the vertical supporting structures at two sides. The invention has simple reinforcing structure, completely avoids pile foundation and internal structure of the existing building, avoids damage to the existing building, completely protects the integrity and safety of the existing building, and has great popularization value.
Description
Technical Field
The invention relates to the technical field of tunnel construction structures, in particular to a reinforcing structure for a shield tunnel to penetrate through an existing building.
Background
Along with the increasing subway construction in China, the shield tunnel is difficult to avoid penetrating through the existing building. When the shield tunnel penetrates through the existing building, sleeve valve pipe grouting is conducted around the house in the traditional method, the geology below the existing building is converged, and the bearing capacity of the whole geology is improved. However, due to the weight increase of the existing building, uneven settlement of the existing building is too large caused by poor geology below the existing building, cracking of the wall of the existing building to be traversed causes the existing building to become a dangerous house, and the existing building is particularly expensive in north, on top of the first-line city, wide in range and deep in house price, and the existing building safety reinforcement such as the crossing of the temple and the ancient building group for cultural relics is more important due to the fact that some existing building owners are not matched with the shield tunnel without the option of dismantling, and the social value and the economic value are particularly huge.
In order to solve the problem, there is a Chinese patent with the patent number of CN107119732A, namely a group beam active underpinning method of a shield tunnel underpass building, and the method for reinforcing the shield tunnel underpass building is provided, wherein the method comprises the steps of firstly, performing earth excavation and reinforcing waterproof treatment on an indoor ground, constructing a pile foundation, and then manufacturing a main beam on the pile foundation; then embedding secondary beams on foundation columns to be underpinned at the bottom of the building, wherein two ends of each secondary beam are respectively arranged on a main beam through a hydraulic jack, and the building in the area affected by the subway tunnel is supported by pile foundations, the main beams and the secondary beams; finally, the settlement condition of the upright post is monitored in real time, and if the upright post is settled, the main beam and the house are adjusted to be settled through a hydraulic jack; if the upright post does not settle or does not settle any more, the original upright post of the house below the secondary beam is cut through the shield machine, and the tunnel passes through the lower part of the house. The method can well control the settlement of the whole building, but the method for excavating the indoor bottom of the building is difficult to implement at all because the method needs to excavate the indoor bottom of the building, has large damage to the whole building, is not beneficial to popularization and use, and is particularly suitable for ancient buildings.
Disclosure of Invention
The invention aims to solve the problems of large damage to the existing building and difficult popularization of the shield tunnel underpass building reinforcement method in the prior art, and provides a reinforcement structure for the shield tunnel underpass existing building.
The technical scheme of the invention is as follows: a shield tunnel wears reinforced structure of existing building under, its characterized in that: the vertical support structure is positioned at two lateral sides of the existing building, and the lateral support structure is positioned between the existing building and the shield tunnel; the vertical supporting structure is a pile foundation structure inserted into soil bodies at two lateral sides of a traveling route of the shield tunnel; the two ends of the transverse supporting structure are fixed on the vertical supporting structures at two sides to form a portal structure for supporting the existing building, and a tensioning structure for transversely tensioning the transverse supporting structure is arranged between the vertical supporting structures at two sides.
The transverse supporting structure further comprises a plurality of longitudinal pipelines which are arranged along the traveling direction of the shield tunnel and a plurality of transverse pipelines which are perpendicular to the traveling direction of the shield tunnel; the longitudinal pipelines and the transverse pipelines are grouting pipelines with a plurality of grouting through holes uniformly distributed on the pipe body, and are criss-cross arranged and connected together through grouting hooks in the pipes to form a reinforced concrete structure for supporting the existing building.
If the pile foundation is not supported below the existing building, the transverse supporting structure only needs to arrange the transverse pipeline.
The tension structure further comprises an anchor cable penetrating through the transverse pipeline; and two ends of the anchor cable are fixedly connected with the vertical supporting structures at two sides respectively.
The vertical supporting structure further comprises a plurality of reinforcing piles inserted and driven at two sides of the existing building, and the reinforcing piles are arranged at intervals along the travelling direction of the shield tunnel.
Further the vertical support structure comprises connecting beams which are cast on a row of reinforcing piles on the same side of the existing building.
The two ends of the transverse steel pipe extend into the connecting beam respectively and are poured into the continuous beam.
The pipe body of the transverse steel pipe extending into the continuous beam is of a closed pipeline structure with no surface pore.
Further the vertical supporting structure also comprises steel cofferdams positioned at two lateral sides of the existing building; the reinforcing piles are inserted and driven into soil in the steel cofferdam.
The shield tunnel further comprises a plurality of sleeve valve pipes positioned between the vertical supporting structure and the existing building, and the sleeve valve pipes are arranged at intervals along the travelling direction of the shield tunnel.
The longitudinal pipeline and the transverse pipeline are grouting pipelines penetrating into the foundation gap of the pile foundation below the existing building.
The invention constructs reinforcing piles on two lateral sides of the existing building, transverse and longitudinal pipelines are penetrated in soil bodies between the existing building and a shield tunnel, the pipelines are grouting pipes, the transverse pipelines penetrate anchor ropes, two ends of each transverse pipeline are fixed on connecting beams at the top ends of the reinforcing piles, the anchor ropes are tensioned after the concrete strength of the connecting beams reaches the tensile strength, then grouting is carried out on the pipelines, the slurry enters the soil bodies around the pipelines, the grouting wraps the anchor ropes to form a reinforced concrete structure for bearing the existing building, and the reinforcement of the existing building is completed after the grouting reaches the design strength. The supporting force formed by the tensile force of the anchor cable is converted into the supporting force formed by the reverse friction force of the reinforced pile foundation through the reinforced pile, so that the function of supporting the existing building is achieved. Simultaneously, grouting is carried out in the pipeline after the pipeline is stretched, and the grouting body is injected into soil body through grouting holes to form a reinforcing layer, so that the sand settlement above the reinforcing body is blocked.
The invention has the advantages that: 1. according to the invention, the portal frame structures are arranged on the two lateral sides and the lower side of the existing building to support and fix the existing building, so that the problem that damage to the building is caused by excavating the existing building is avoided;
2. according to the invention, the tension structures are arranged on the vertical supporting structures at the two sides, so that the transverse supporting structure below the existing building is tensioned, the sinking acting force of the existing building is effectively transferred to the reverse friction force of the reinforced pile foundation, and the risk of the sinking of the existing building and the soil body change on the construction of the shield tunnel is avoided;
3. According to the invention, the grouting pipeline is used for grouting and reinforcing the soil body below the existing building, firstly, a reinforcing layer is formed, sand settlement above the reinforcing body is prevented, and sand settlement caused by water loss when the shield passes through the building is avoided. Secondly, the rigidity of the soil body below can be enhanced to avoid the problem of sinking, thirdly, a stable supporting structure can be formed to support the existing building;
4. According to the invention, the steel cofferdam is used as a construction platform for reinforcing piles and connecting beams, so that the construction risk problem caused by sinking and water seepage of roadbeds on two sides of an existing building is avoided, the safety problem of constructors is ensured, and the efficiency and safety of construction operation are improved;
5. according to the invention, grouting reinforcement is carried out in soil between the vertical supporting structure and the existing building through the sleeve valve pipe, so that a water (soil) stopping curtain structure is formed, and the problem of larger ground surface subsidence possibly caused by a water-rich sand layer in the construction process is solved;
6. The reinforcement method provided by the invention has a wide application range, is suitable for reinforcement of various structures, and can be used for reinforcement treatment no matter how tall the structures are and how complex the stratum is, and no matter whether the structures have pile foundations or not.
The invention has simple reinforcing structure, completely avoids the problem that the pile foundation construction cannot be carried out indoors, completely solves the problem that the Fang Fushui sand layer under the house pile foundation is dehydrated and settled due to shield construction, completely avoids the pile foundation and the internal structure of the existing building, avoids the damage to the existing building, completely protects the integrity and the safety of the existing building, and has great popularization value.
Drawings
Fig. 1: front view of the reinforcement structure of the invention;
Fig. 2: the reinforcing structure of the invention is a schematic top view;
Wherein: 1-a longitudinal duct; 2-transverse duct; 3-reinforcing piles; 4-connecting beams; 5-steel cofferdam; 6-existing building; 7-pile foundation.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1-2, if the existing building 6 is penetrated under the shield tunnel to perform reinforcement treatment, if the soil layer below the existing building 6 is a water-rich sand layer, in order to avoid the problem of subsurface layers caused by overlarge precipitation in the construction process, waterproof curtains need to be constructed on two lateral sides of the existing building 6 in advance, in this embodiment, a sleeve valve pipe is inserted in the soil body around the 1 meter interval of the existing building 6, and then reinforcement treatment is performed on the soil body by grouting.
If the soil body below the existing building 6 is not a water-rich soil layer, the construction of the waterproof curtain is not needed. The reinforcing structure is in fact a portal structure comprising vertical support structures located on both lateral sides of the existing building 6 and lateral support structures located in the soil mass between the lower side of the existing building 6 and the upper side of the shield tunnel. As shown in fig. 1-2, in this embodiment, before constructing the vertical supporting structure, steel cofferdams 5 are constructed on both lateral sides of an existing building 6 in advance as a construction platform, then reinforcing piles 3 are inserted into the steel cofferdams 5, a plurality of reinforcing piles 3 are arranged at intervals along the traveling direction of the shield tunnel, and reinforcing steel bars of about 1m are reserved at the upper ends of the reinforcing piles 3, so as to prepare for subsequent construction of continuous beams 4.
As shown in fig. 2, the transverse supporting structure of the embodiment includes a plurality of longitudinal pipes 1 arranged along the traveling direction of the shield tunnel and a plurality of transverse pipes 2 perpendicular to the traveling direction of the shield tunnel, the longitudinal pipes 1 and the transverse pipes 2 are grouting pipes with a plurality of grouting through holes uniformly distributed on the pipe body, and the longitudinal pipes 1 and the transverse pipes 2 are crisscrossed and connected together through grouting hooks into the pipe to form a reinforced concrete structure for supporting the existing building 6. The longitudinal pipeline 1 and the transverse pipeline 2 are grouting pipelines penetrating into the gap of the pile foundation 7 below the existing building 6.
And (3) drilling anchor rope holes by utilizing automatic guiding drilling equipment, then penetrating the longitudinal pipeline 1 and the transverse pipeline 2 with holes, penetrating the anchor rope into the transverse pipeline 2, and connecting the anchor rope with a tensioning anchorage device in the steel cofferdam 5. After the construction of all the longitudinal pipelines 1 and the transverse pipelines 2 is completed, the anchor cables are tensioned and fixed by utilizing a tensioning anchor device, grouting is carried out in the transverse pipelines 2, grouting slurry penetrates into the soil body below the existing building 6 through the grouting through holes, the soil body is reinforced, the slurry flows into the soil body to form a ' soil ' curtain ', and the soil body settlement at the upper part of the anchor cables caused by the settlement at the lower part of the anchor cables is prevented.
The connecting beam 4 is formed by leaving a 3m wide neutral gear close to the inner side of the existing building 6, the width of the connecting beam 4 depends on the tension of the anchor cable, the purpose is to resist the tension of the anchor cable and reduce the bending moment to the reinforced pile 3, the connecting beam 4 is of a reinforced concrete structure, and the inner steel bars and the reinforced pile foundation are mutually bound by reserving 1m high steel bars. As shown in fig. 1, the connecting beam 4 is cast on the upper ends of a row of reinforcing piles 3 on the same side of the existing building 6.
In the embodiment, two ends of the anchor cable and the transverse steel tube 2 are partially poured and fixed in the connecting beam 4, and in order to avoid hole blocking, the tube body of the transverse steel tube 2 extending into the continuous beam 4 is of a closed pipeline structure with no surface pore.
During actual construction, the method comprises the following steps: 1. constructing steel cofferdams 5 serving as construction platforms on two lateral sides of an existing building 6;
2. Constructing a reinforcing pile 3 in the steel cofferdam 5, and reserving pile top reinforcing steel bars of the reinforcing pile 3;
3. Drilling a soil body between the existing building 6 and the shield tunnel, penetrating a transverse pipeline 2 and a longitudinal pipeline 1 into the drilling holes, and penetrating anchor cables into the transverse pipeline 2;
4. Binding reinforcing steel bars of the connecting beam 4 at the pile top of the reinforcing pile 3, binding and fixing the reinforcing steel bars of the connecting beam 4 and the reinforcing steel bars of the pile top together, pouring the connecting beam 4, and enabling non-porous parts at two ends of the transverse pipeline 2 to penetrate through the connecting beam 4;
5. After the strength of the connecting beam 4 meets the requirement, the anchor cable is stretched, grouting is performed in the transverse pipeline 2 and the longitudinal pipeline 1 after the design requirement is met, and the construction of the reinforcing structure is completed after the grouting reaches the design strength.
As shown in fig. 2, the longitudinal direction of the present embodiment refers to the traveling direction of the shield tunnel, i.e., the left-right direction in fig. 2, and the lateral direction refers to the traveling direction of the vertical shield tunnel, i.e., the up-down direction in fig. 2.
The shield tunnel described in this embodiment passes through the existing building in front, if the existing building is located at the positions on two sides of the shield tunnel, the reinforcement structure is not convenient to arrange, and in fact, the reinforcement structure can be arranged on the shield tunnel, that is, the reinforcement pile is not inserted at the position overlapping with the intersection of the shield tunnel, so that the passing position of the shield tunnel is avoided, in order to ensure the stability of the whole reinforcement structure, the insertion and play range of other reinforcement piles can be properly prolonged, and the length of the connecting beam is prolonged.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A shield tunnel wears reinforced structure of existing building under, its characterized in that: comprises a vertical supporting structure positioned at two lateral sides of the existing building (6) and a lateral supporting structure positioned between the existing building (6) and the shield tunnel; the vertical supporting structure is a pile foundation structure inserted into soil bodies at two lateral sides of a traveling route of the shield tunnel; the two ends of the transverse supporting structure are fixed on the vertical supporting structures at two sides to form a portal structure for supporting the existing building (6), and a tensioning structure for transversely tensioning the transverse supporting structure is arranged between the vertical supporting structures at two sides;
The transverse supporting structure comprises a plurality of longitudinal pipelines (1) which are arranged along the travelling direction of the shield tunnel and a plurality of transverse pipelines (2) which are perpendicular to the travelling direction of the shield tunnel; the longitudinal pipelines (1) and the transverse pipelines (2) are grouting pipelines with a plurality of grouting through holes uniformly distributed on the pipe body, and the longitudinal pipelines (1) and the transverse pipelines (2) are crisscrossed and connected together through grouting hooks in the pipes to form a reinforced concrete structure for supporting the existing building (6);
the tension structure comprises an anchor rope penetrating through the transverse pipeline (2); the two ends of the anchor cable are fixedly connected with the vertical supporting structures at the two sides respectively;
The longitudinal pipeline (1) and the transverse pipeline (2) are grouting pipelines which are arranged in the gap of the pile foundation (7) below the existing building (6) in a penetrating mode.
2. A shield tunnel underrun existing building reinforcing structure as set forth in claim 1, wherein: the vertical supporting structure comprises a plurality of reinforcing piles (3) inserted and beaten at two sides of the existing building (6), and the reinforcing piles (3) are arranged at intervals along the travelling direction of the shield tunnel.
3. A shield tunnel underrun existing building reinforcing structure as set forth in claim 2, wherein: the vertical supporting structure comprises connecting beams (4) cast on a row of reinforcing piles (3) on the same side of the existing building (6).
4. A shield tunnel underrun existing building reinforcing structure as set forth in claim 3, wherein: the two ends of the transverse pipeline (2) extend into the connecting beam (4) respectively and are poured into the connecting beam (4).
5. A shield tunnel underrun existing building reinforcing structure as set forth in claim 4, wherein: the pipe body of the transverse pipeline (2) extending into the connecting beam (4) is of a closed pipeline structure with no pore on the surface.
6. A shield tunnel underrun existing building reinforcing structure as set forth in claim 2, wherein: the vertical supporting structure also comprises steel cofferdams (5) positioned at the two lateral sides of the existing building (6); the reinforcing piles (3) are inserted into soil in the steel cofferdam (5).
7. A shield tunnel underrun existing building reinforcing structure as set forth in claim 1, wherein: the shield tunnel shield valve further comprises a plurality of sleeve valve pipes which are positioned between the vertical supporting structure and the existing building (6), and the sleeve valve pipes are arranged at intervals along the travelling direction of the shield tunnel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910137520.XA CN109779636B (en) | 2019-02-25 | 2019-02-25 | Reinforcing structure for shield tunnel to penetrate through existing building |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910137520.XA CN109779636B (en) | 2019-02-25 | 2019-02-25 | Reinforcing structure for shield tunnel to penetrate through existing building |
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| CN109779636A CN109779636A (en) | 2019-05-21 |
| CN109779636B true CN109779636B (en) | 2024-06-07 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112031809B (en) * | 2020-09-17 | 2022-02-08 | 西南交通大学 | Underground engineering structure meeting double-zero conditions and construction method |
| CN112459796B (en) * | 2020-11-12 | 2023-07-21 | 上海隧道工程有限公司 | Pipe jacking crossing section construction method for crossing underground structure building |
| CN112459790B (en) * | 2020-11-12 | 2023-05-16 | 上海隧道工程有限公司 | Pre-protection structure and pre-protection method for tunnel crossing section before crossing underground structure building |
| CN114411761B (en) * | 2022-02-28 | 2023-09-22 | 甘肃第七建设集团股份有限公司 | Advanced pre-supporting system and method for subway tunnel to be built in new building construction |
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2019
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|---|---|---|---|---|
| FR1337041A (en) * | 1962-10-19 | 1963-09-06 | Method of establishing foundations on piles for construction work of all types | |
| CN101250886A (en) * | 2008-04-09 | 2008-08-27 | 武汉大学 | Method for reinforcing masonry structure building base |
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