CN113235639A - Existing line lower row pile enclosure structure and construction method thereof - Google Patents
Existing line lower row pile enclosure structure and construction method thereof Download PDFInfo
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- CN113235639A CN113235639A CN202110331471.0A CN202110331471A CN113235639A CN 113235639 A CN113235639 A CN 113235639A CN 202110331471 A CN202110331471 A CN 202110331471A CN 113235639 A CN113235639 A CN 113235639A
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 238000009412 basement excavation Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000008093 supporting effect Effects 0.000 claims abstract description 7
- 239000004567 concrete Substances 0.000 claims description 16
- 230000002787 reinforcement Effects 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims 1
- 239000002689 soil Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/16—Foundations formed of separate piles
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
- E01C1/04—Road crossings on different levels; Interconnections between roads on different levels
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/08—Deep or vertical foundation
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention belongs to the technical field of civil construction engineering, and particularly provides a row pile enclosure structure under an existing line and a construction method thereof, wherein a firm overhead system is formed by arranging an overhead temporary beam, row piles and fulcrum piles under an existing railway, so that the support and protection effects on the existing line are achieved, the excavation range of a foundation pit under the railway during cast-in-place construction is effectively reduced, and when some important facilities near a proposed construction area cannot be moved, the foundation pit does not need to be protected and slope-collected additionally; when the soil layer of the field is a soft stratum, reinforcing soft soil in the passive area by adopting mutually meshed jet grouting piles, improving the mechanical property of the soil body in the passive area, providing more passive area resistance for the horizontally stressed enclosure row piles, arranging a foundation reinforcing area of a tunnel bridge between the passive reinforcing areas, and reinforcing the existing roadbed and the soft stratum; in addition, a mattress layer and a reinforcing layer are further adopted, so that the supporting capacity of the whole row pile enclosure structure in the process of constructing the tunnel bridge under the existing railway is improved.
Description
Technical Field
The invention belongs to the technical field of civil construction engineering, and particularly relates to an existing line lower row pile enclosure structure and a construction method thereof.
Background
Under the conventional condition, the underpass tunnel bridge is constructed by adopting the jacking construction after the overhead existing line. When the aperture of the tunnel bridge is small or the geological conditions of the site are good, the method can obtain obvious economic benefits, but with the requirement of urban construction development, the tunnel bridge sometimes needs to be built in a goods yard of a multistrand railway. At the moment, jacking construction is adopted, the jacking length is too long, so that the construction cost is too high, when the site is planned to be soft soil, the jacking scheme even has the defects of incapability of carrying a head, incapability of reinforcing a foundation and the like, and the risk of carrying a head can be avoided by adopting the cast-in-place construction after the overhead line, so that the foundation can be effectively reinforced, and better economic benefit can be obtained.
In the common cast-in-place construction, a foundation pit with a large area is formed under a railway by slope-laying and foundation pit excavation on an existing railway roadbed, and when some important facilities near a planned construction field cannot be moved and changed, the foundation pit needs to be protected and slope-folded. Therefore, the invention provides an improved cast-in-place construction method, by arranging the enclosure row piles under the existing railway and adopting the jet grouting piles to interlock and reinforce the soft soil in the passive area of the row piles, the resistance of the passive area is increased, and the excavation range of the foundation pit under the railway during cast-in-place construction can be effectively reduced.
Disclosure of Invention
The invention aims to solve the problem that the prior art can form a foundation pit with a larger area under a railway and influence important facilities which cannot be moved and changed and exist near a proposed field area.
Therefore, the invention provides a construction method of an existing line lower row pile enclosure structure, which comprises the following steps:
s1: arranging a buttress under a ballast bed of an existing railway, and arranging an overhead temporary beam on the top of the buttress to form a primary overhead system;
s2: determining actual construction sites of a tunnel bridge framework according to construction requirements of a tunnel bridge under a line, carrying out groove-drawing construction on existing railway roadbeds on two sides of the tunnel bridge framework along the longitudinal direction, constructing a plurality of fulcrum piles I side by side after forming an equipment working space, forming a group of row piles on two sides of the tunnel bridge framework respectively, and connecting the fulcrum piles I and the row piles through crown beams to form a whole;
s3: carrying out groove-drawing construction on the existing railway roadbed between the two groups of row piles, and constructing a plurality of fulcrum piles II distributed at intervals after forming an equipment working space to form a final overhead system;
s4: vertically and downwards driving a plurality of rotary jet grouting piles I into a weak stratum at a position close to two groups of row piles under a tunnel bridge frame to respectively form two groups of passive reinforcing areas so as to provide horizontal resistance for the row piles; vertically and downwards driving a plurality of jet grouting piles II into a weak stratum between the two groups of passive reinforcing areas to form a foundation reinforcing area of the tunnel bridge;
s5: excavating a foundation pit, binding reinforcing steel bars, and pouring a tunnel bridge frame;
s6: repairing the side surface and the top surface of the tunnel bridge, recovering the track bed of the existing railway, backfilling the foundation pit, removing the overhead system except the row piles, and recovering the railway running line.
Specifically, the temporary overhead beams in the step S1 include a plurality of longitudinal beams and a plurality of cross beams; wherein the longitudinal beams are parallel to the direction of travel of the railway; the cross beam is vertically crossed and connected with the longitudinal beam; the longitudinal beam is formed by connecting at least two I-shaped steels through a longitudinal beam splicing head.
Specifically, in both the step S2 and the step S3, a skip groove excavation method is adopted to perform groove-pulling construction on the existing railway roadbed, and the fulcrum pile i and the fulcrum pile ii are constructed in time after each groove-pulling excavation.
Specifically, the step S2 further includes pouring a plurality of concrete buttress blocks i at intervals along the longitudinal direction on the top of the row pile, and inverting the overhead fulcrums to the concrete buttress blocks i.
Specifically, the step S3 further includes pouring a concrete buttress block ii on the fulcrum pile ii, and inverting the overhead fulcrum to the concrete buttress block ii to form the final overhead system.
Specifically, the passive reinforcement area comprises a plurality of longitudinal sections formed by mutually meshing a plurality of jet grouting piles I and a plurality of transverse sections formed by mutually meshing a plurality of jet grouting piles I; the transverse sections are arranged between two adjacent longitudinal sections at equal intervals.
Specifically, a plurality of rotary spraying piles II in the reinforcing area of the foundation of the tunnel bridge are distributed in a plurality of rows at equal intervals.
Specifically, the step S4 further includes disposing a mattress layer above the passive reinforcement area and the foundation reinforcement area.
Specifically, a reinforcing layer is arranged between the contact surface of the tunnel bridge frame and the railway roadbed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the construction method of the existing line lower row pile enclosure structure, the overhead temporary beam, the row piles and the fulcrum piles are arranged under the existing railway to form an overhead system to support and protect the existing line, the excavation range of the foundation pit under the railway during cast-in-place construction is effectively reduced, and when some important facilities near a proposed construction field area cannot be moved, the foundation pit does not need to be additionally protected and slope-collected; when soft soil exists in the planned construction field area, the soft soil in the passive area is reinforced by the mutually meshed jet grouting piles, so that more passive area resistance is provided for the horizontally stressed enclosure row pile, and the supporting capacity of the whole row pile enclosure structure is improved.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is an overhead elevation schematic of the present invention.
Fig. 2 is an overhead plan view of the present invention.
Fig. 3 is a schematic plan view of a row of piles according to the present invention.
Fig. 4 is a schematic view of the location of the jet grouting pile in the passive consolidation zone of the present invention.
Fig. 5 is a schematic view of the sites of the shotcrete piles in the reinforcing section of the foundation of the road bridge according to the present invention.
Figure 6 is a schematic elevation view of existing line underlisting pile enclosure of the present invention.
Figure 7 is a schematic plan view of existing line underlisting pile enclosure of the present invention.
Fig. 8 is a schematic diagram of a preliminary overhead system of the present invention.
Figure 9 is a schematic plan view of a double row of piles according to the present invention.
Reference numerals: 1. a stringer; 2. a cross beam; 3. a longitudinal beam splice; 4. buttress; 5. a railway; 6. a road shoulder; 7. a concrete buttress block I; 8. a fulcrum pile I; 9. pile arrangement; 10. a concrete buttress block II; 11. a fulcrum pile II; 12. a jet grouting pile I; 13. a passive reinforcement zone; 14. a jet grouting pile II; 15. a basement reinforcement area of the tunnel bridge; 16. a formation boundary; 17. a mattress layer; 18. a tunnel bridge frame; 19. a reinforcement layer; 20. a crown beam.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Although representative embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the appended claims and equivalents thereof.
Referring to fig. 1 to 8, the present invention provides a construction method of an existing line lower row pile envelope, comprising the steps of:
s1: arranging a buttress 4 below a ballast bed of an existing railway 5, arranging an overhead temporary beam at the top of the buttress 4, and wrapping a railway line on the inner side of a road shoulder 6 in the overhead temporary beam to form a primary overhead system; the overhead crane girder comprises a plurality of longitudinal girders 1 and a plurality of cross girders 2; wherein the longitudinal beams 1 are parallel to the running direction of the railway 5; the cross beam 2 is vertically crossed and connected with the longitudinal beam 1; when the span of the underpass bridge frame 18 is large, the longitudinal beam 1 is formed by connecting a plurality of I-shaped steel through the longitudinal beam splicing heads 3. The overhead temporary beam is arranged to strengthen the protection of the railway 5 lines, so that the lines are not deformed in the integral structure formed by the fixed longitudinal beams 1, the transverse beams 2 and the railway 5, and the interference of the subsequent construction process to the railway is effectively avoided.
S2: determining actual construction sites of a tunnel bridge frame according to construction requirements of a tunnel bridge under a line, carrying out groove-drawing construction on the existing railway 5 roadbeds on two sides of the tunnel bridge frame 18 along the longitudinal direction by adopting a groove-jumping excavation method, after forming an equipment working space, constructing a plurality of fulcrum piles I8 side by side according to the principle of 'construction along with excavation', forming a group of row piles 9 on two sides of the tunnel bridge frame 18 respectively, and connecting the fulcrum piles I8 and the row piles 9 through crown beams 20 to form a whole; when the stability of the single row of piles cannot meet the actual supporting requirement and deformation is generated under pressure, the row of piles 9 can be set to be a double-row pile structure as shown in fig. 9, and the double-row piles are utilized to provide higher rigidity for the supporting system; specifically, a plurality of concrete buttress blocks I7 can be poured at intervals along the longitudinal direction at the top of the row piles 9, and the overhead fulcrums are switched to the concrete buttress blocks I, so that the overhead bearing pressure of the fulcrum piles I8 is reduced, and the stability of the fulcrum piles is improved;
s3: carrying out groove-drawing construction on the existing railway 5 subgrade between two groups of row piles 9 by adopting a groove-jumping excavation method, and constructing a plurality of fulcrum piles II 11 which are distributed at intervals according to the principle of 'construction along with excavation' after forming an equipment working space to form a final overhead system; a concrete buttress block II 10 can be poured on the fulcrum pile II 11, and an overhead fulcrum is switched to the concrete buttress block II 10 so as to reduce the overhead bearing pressure of the fulcrum pile II 11;
s4: vertically and downwards driving a plurality of rotary spraying piles I12 into a weak stratum at a position close to two groups of row piles 9 under a tunnel bridge frame 18 to respectively form two groups of passive reinforcing areas 13; because the row piles 9 are horizontally stressed structures, the structure of the passive reinforcement area 13 preferably comprises a plurality of longitudinal sections formed by mutually meshing a plurality of jet grouting piles I12 and a plurality of transverse sections formed by mutually meshing a plurality of jet grouting piles I12, and the transverse sections are arranged between two adjacent longitudinal sections at equal intervals to provide more passive area resistance for the row piles 9; further, in order to improve the bearing capacity of the soft foundation, a plurality of rotary spraying piles II 14 are vertically and downwards driven into the soft ground layer between two groups of passive reinforcing areas 13, and the rotary spraying piles II 14 are distributed in a plurality of rows at equal intervals to form a foundation reinforcing area 15 of the tunnel bridge; in a detailed implementation mode, a mattress layer 17 is arranged above the passive reinforcement area 13 and the foundation reinforcement area 15 of the tunnel bridge to ensure that the jet grouting pile and the stratum share the load together, the vertical load of the pile is shared by changing the thickness of the mattress layer 17, the stress concentration of the bottom surface of the stratum foundation is reduced, and the horizontal load of the pile and the stratum is shared.
S5: excavating a foundation pit, binding reinforcing steel bars, and pouring a tunnel bridge frame 18;
s6: repairing the bottom surface and the top surface of the tunnel bridge, recovering the track bed of the existing railway 5, backfilling a foundation pit, removing overhead system components except the row piles 9, namely the overhead temporary beam, the buttress 4, the concrete buttress block I7, the concrete buttress block II 10 and the fulcrum pile II 11, and recovering the railway running line.
In conclusion, the construction method of the enclosing structure of the row piles under the existing line provided by the invention forms a firm overhead system by arranging the overhead temporary beams, the row piles and the fulcrum piles under the existing railway, and when some important facilities near the planned construction field area cannot be moved, the supporting and protecting effects on the existing line are achieved, and the excavation range of the foundation pit under the railway during cast-in-place construction is effectively reduced; meanwhile, soft soil in the passive area is reinforced by adopting mutually meshed jet grouting piles, so that more passive area resistance is provided for the horizontally stressed enclosure row piles, and a foundation reinforcing area of a tunnel bridge is arranged between the passive reinforcing areas to reinforce the existing roadbed and the soft stratum; in addition, a mattress layer and a reinforcing layer are further adopted, so that the supporting capacity of the whole row pile enclosure structure is improved.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. A construction method of an existing line lower row pile enclosure structure is characterized by comprising the following steps:
s1: arranging a buttress (4) below a track bed of an existing railway (5), and arranging an overhead temporary beam on the top of the buttress (4) to form a primary overhead system;
s2: according to the construction requirements of an off-line road bridge, determining actual construction sites of a road bridge frame (18), carrying out groove-drawing construction on the existing railway (5) roadbeds on the two sides of the road bridge frame (18) along the longitudinal direction, constructing a plurality of fulcrum piles I (8) side by side after forming an equipment working space, respectively forming a group of row piles (9) on the two sides of the road bridge frame (18), and connecting the fulcrum piles I (8) and the row piles (9) through crown beams (20) to form a whole;
s3: carrying out groove-drawing construction on the existing railway (5) roadbed between the two groups of row piles (9), and after forming an equipment working space, constructing a plurality of fulcrum piles II (11) distributed at intervals to form a final overhead system;
s4: vertically and downwardly driving a plurality of rotary jet piles I (12) into a weak stratum at a position close to two groups of row piles (9) under a tunnel bridge frame (18) to respectively form two groups of passive reinforcing areas (13) for providing horizontal resistance for the row piles (9); vertically and downwards driving a plurality of jet grouting piles II (14) into a weak stratum between two groups of passive reinforcing areas (13) to form a foundation reinforcing area (15) of the tunnel bridge;
s5: excavating a foundation pit, binding reinforcing steel bars, and pouring a tunnel bridge frame (18);
s6: repairing the side surface and the top surface of the tunnel bridge, recovering the track bed of the existing railway (5), backfilling the foundation pit, removing the overhead system except the row piles (9), and recovering the railway running line.
2. The construction method of an existing line lower row pile envelope of claim 1, wherein: the temporary overhead beam in the step S1 comprises a plurality of longitudinal beams (1) and a plurality of cross beams (2); wherein the longitudinal beams (1) are parallel to the running direction of the railway (5); the cross beam (2) is vertically crossed and connected with the longitudinal beam (1); the longitudinal beam (1) is formed by connecting at least two I-shaped steels through a longitudinal beam splicing head (3).
3. The construction method of an existing line lower row pile envelope of claim 1, wherein: and in the step S2 and the step S3, a groove jumping excavation method is adopted to carry out groove pulling construction on the roadbed of the existing railway (5), and the fulcrum pile I (8) and the fulcrum pile II (11) are constructed in time after each groove pulling excavation.
4. The construction method of an existing line lower row pile envelope of claim 1, wherein: and the step S2 also comprises the steps of pouring a plurality of concrete buttress blocks I (7) at the top of the row piles (9) along the longitudinal interval, and switching the overhead supporting points to the concrete buttress blocks I (7).
5. The construction method of an existing line lower row pile envelope of claim 1, wherein: and step S3, further comprising the steps of pouring a concrete buttress block II (10) on the fulcrum pile II (11), and inverting the overhead fulcrum to the concrete buttress block II (10) to form a final overhead system.
6. The construction method of an existing line lower row pile envelope of claim 1, wherein: the passive reinforcement area (13) comprises a plurality of longitudinal sections formed by mutually meshing a plurality of jet grouting piles I (12) and a plurality of transverse sections formed by mutually meshing a plurality of jet grouting piles I (12); the transverse sections are arranged between two adjacent longitudinal sections at equal intervals.
7. The construction method of an existing line lower row pile envelope of claim 1, wherein: a plurality of rotary spraying piles II (14) in the foundation reinforcement area (15) of the tunnel bridge are distributed in a plurality of rows at equal intervals.
8. The construction method of an existing line lower row pile envelope of claim 1, wherein: the step S4 further includes disposing a mattress layer (17) over the passive reinforcement area (13) and the foundation reinforcement area (15).
9. The construction method of an existing line lower row pile envelope of claim 1, wherein: the step S5 further includes providing a reinforcing layer (19) between the contact surface of the roadbed of the railroad bridge (5) and the frame (18).
10. The construction method of an existing line lower row pile envelope of claim 1, wherein: each set of row piles (9) in the step S2 may be a double row pile structure arranged side by side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110331471.0A CN113235639A (en) | 2021-03-29 | 2021-03-29 | Existing line lower row pile enclosure structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110331471.0A CN113235639A (en) | 2021-03-29 | 2021-03-29 | Existing line lower row pile enclosure structure and construction method thereof |
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| CN113235639A true CN113235639A (en) | 2021-08-10 |
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| CN202110331471.0A Pending CN113235639A (en) | 2021-03-29 | 2021-03-29 | Existing line lower row pile enclosure structure and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113699895A (en) * | 2021-09-29 | 2021-11-26 | 西安建筑科技大学 | Construction method for overhead jacking of frame-structured bridge into existing line of multiple tracks |
| CN113833022A (en) * | 2021-09-30 | 2021-12-24 | 中铁第五勘察设计院集团有限公司 | Railway line reinforcing system and construction method |
| CN116397478A (en) * | 2023-03-31 | 2023-07-07 | 中铁武汉勘察设计院有限公司 | A method and structure for joint construction of embankments passing through existing railway subgrades under limited conditions |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113699895A (en) * | 2021-09-29 | 2021-11-26 | 西安建筑科技大学 | Construction method for overhead jacking of frame-structured bridge into existing line of multiple tracks |
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| CN113833022A (en) * | 2021-09-30 | 2021-12-24 | 中铁第五勘察设计院集团有限公司 | Railway line reinforcing system and construction method |
| CN113833022B (en) * | 2021-09-30 | 2023-08-15 | 中铁第五勘察设计院集团有限公司 | Railway line reinforcing system and construction method |
| CN116397478A (en) * | 2023-03-31 | 2023-07-07 | 中铁武汉勘察设计院有限公司 | A method and structure for joint construction of embankments passing through existing railway subgrades under limited conditions |
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Application publication date: 20210810 |
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