CN114922017B - Newly-built cantilever type retaining wall-existing stake board wall roadbed group wide integrated configuration - Google Patents
Newly-built cantilever type retaining wall-existing stake board wall roadbed group wide integrated configuration Download PDFInfo
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- CN114922017B CN114922017B CN202210047158.9A CN202210047158A CN114922017B CN 114922017 B CN114922017 B CN 114922017B CN 202210047158 A CN202210047158 A CN 202210047158A CN 114922017 B CN114922017 B CN 114922017B
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- 238000000034 method Methods 0.000 claims abstract description 4
- 239000004567 concrete Substances 0.000 claims description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000010276 construction Methods 0.000 claims description 18
- 239000002689 soil Substances 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 238000004873 anchoring Methods 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
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- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims 1
- 239000010426 asphalt Substances 0.000 claims 1
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- 235000005607 chanvre indien Nutrition 0.000 claims 1
- 239000011487 hemp Substances 0.000 claims 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
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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
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention provides a newly-built cantilever retaining wall-existing pile plate wall roadbed slope width combined structure, and relates to the technical field of road and railway existing line base widening and reconstruction engineering. The newly-built cantilever type retaining wall-existing pile plate wall roadbed slope width combined structure comprises an existing pile plate type retaining wall, a newly-built cantilever type retaining wall, a crown beam and a newly-increased inclined-pulling prestressed anchor cable, wherein the crown beam is arranged at the top of an existing pile plate type retaining wall pile body, the newly-built cantilever type retaining wall is arranged on the inner side of the crown beam top, and the newly-increased inclined-pulling prestressed anchor cable is arranged on the newly-increased crown beam. The crown beam is arranged at the top of the existing pile plate wall, the integrity of the pile plate wall is improved, then the cable-stayed prestressed anchor cables are additionally arranged in the crown beam at certain intervals along the longitudinal direction of the line, the combined retaining structures act cooperatively, the external load is shared jointly, the bearing function of the existing pile plate wall is fully exerted, the implementation is simple and easy to operate, and the method is suitable for the engineering of improving the width of the wall of the existing embankment under the condition of limited topography.
Description
Technical Field
The invention relates to the technical field of road and railway existing line foundation widening and reconstruction engineering, in particular to a newly-built cantilever retaining wall-existing pile plate wall roadbed width combined structure.
Background
In recent years, with the expansion of the demand of passenger and freight transportation, the existing line is rebuilt and the new project adjacent to the existing line is gradually increased year by year, especially, some existing line high embankments which enter urban sections and are adjacent to urban main roads are usually adopted for slope collection due to the condition of shortage of land and no slope, the pile-plate type retaining wall has the advantages of flexible pile position arrangement, convenient construction, land saving, low maintenance cost and the like, is especially suitable for projects such as stable landslide, slope reinforcement, roadbed widening and the like, utilizes the anchoring force provided by an anchoring section and the passive soil pressure to balance the landslide thrust or the soil pressure borne by a loaded section, is a light retaining structure, is cast-in-place or prefabricated by reinforced concrete, has reduced structure thickness, lighter dead weight and is more suitable for the condition of lower bearing capacity of a foundation, and the anti-slip and anti-over stability of the retaining wall depends on the dead weight of the wall and the gravity of filling soil (including load tenons) above a heel plate.
When the foundation wall of the existing pile wall is widely transformed, the existing pile-plate retaining wall mounting mode cannot ensure the safe service of the existing pile-plate retaining wall under the action of newly added load, cannot share lateral pressure, has the problem of low firmness, is difficult to recycle and needs to prepare corresponding mounting regions for mounting in different regions, even needs to collect land to meet the requirement of construction and mounting, and has low application range.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a newly-built cantilever retaining wall-existing pile plate wall roadbed slope width combined structure, which solves the problems that the firmness is low due to no guarantee of newly-increased load and the application range is low due to the need of reconstruction construction aiming at different regions.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the utility model provides a wide integrated configuration of newly-built cantilever type retaining wall-existing stake sheet wall roadbed group, includes existing stake board-like retaining wall, newly-built cantilever type retaining wall, guan liang and newly-increased pre-stressed anchor rope that draws to one side, existing stake board-like retaining wall pile body top is provided with guan liang, and newly-built cantilever type retaining wall sets up the inboard at guan liang top, newly-increased pre-stressed anchor rope sets up on newly-increased guan liang.
Preferably, the newly-built cantilever retaining wall divide into arm, toe board, heel board and tenon, arm lateral wall lower part fixedly connected with toe board, arm inside wall lower part fixedly connected with heel board, arm bottom fixed connection tenon, newly-built cantilever retaining wall sets up the expansion joint in segmentation department, arm is provided with the drain hole of a certain amount apart from the wall top a certain distance, inside is provided with PVC plastics drain pipe, heel board top and arm outside are provided with the back filter layer.
Preferably, the cable-stayed prestressed anchor cable comprises a fastening head, a free section and an anchoring section, wherein the fastening head comprises a cement anchor pier, a steel backing plate and an anchorage device, the prestressed anchor cable adopts 4-8 strands of steel strands, the top end of the cable-stayed prestressed anchor cable is fixedly connected inside a reserved anchor cable hole of a crown beam, the other side of the steel backing plate is connected on one side of the anchorage device, and the cable-stayed prestressed anchor cable forms an included angle theta with a horizontal plane.
Preferably, the construction method of the newly-built cantilever retaining wall-existing pile plate wall roadbed slope width combined structure comprises the following construction steps of
S1, digging steps on the existing embankment slope, wherein the width of each step is not more than 1.5m, and the height of each step is 1.0m, and setting 4% of inward inclined slopes when the steps are dug, leveling and compacting the slope soil body, and preparing for adding crown beams and newly-built cantilever retaining walls;
s2, chiseling and cleaning concrete with the height of 0.5m at the top of the existing pile body before the crown beam is constructed, adopting steel bars with the diameter identical to that of the pile body to be welded with longitudinal steel bars around the pile body, recovering to pour the existing pile body to the designed elevation after the welding is completed, extending the longitudinal steel bars of the extension pile body into the crown beam, ensuring that the extending length meets the related specification requirements, constructing the crown beam by adopting a full-hall bracket method after the concrete strength of the existing pile body meets the design requirements, and reserving anchor cable holes according to the design positions when pouring the crown beam;
s3, after the concrete strength of the crown beam reaches the design strength, coarse-grained soil is adopted to backfill and compact the subgrade after the crown beam until the subgrade is level with the top surface of the crown beam, the bearing capacity of the compacted soil layer is ensured to meet the requirement of the retaining wall on the bearing capacity of the foundation, and then a C25 concrete cushion layer with the thickness of 10cm is poured for leveling to serve as a newly-built cantilever retaining wall reinforcement binding operation surface;
s4, casting the newly-built cantilever type retaining wall body, wherein the construction is carried out in sections, the section length is not more than 10m, after the retaining wall bottom plate and wall steel bars are bound, casting bottom plate and vertical arm concrete by a vertical template, the size and position of tenons are not changed, casting mortice concrete and bottom plate concrete simultaneously, arranging expansion joints at sections of the vertical arms, arranging a drain hole at a certain distance from the vertical arms to the wall top and longitudinally every 2m, embedding PVC plastic drain pipes with phi 10cm, and paving a layer of 0.3m thick bagged sand pebble-sandwiched reverse filtering layer behind the wall;
s5, arranging the cable-stayed pre-stressing anchor cables in the crown beam reserved anchor cable holes, wherein the lower ends of the cable-stayed pre-stressing anchor cables are anchored in the existing embankment stabilized rock soil body, the upper ends of the cable-stayed pre-stressing anchor cables are connected with the crown beam, an included angle theta is formed between the cable-stayed pre-stressing anchor cables and a horizontal plane, and the cable-stayed pre-stressing anchor cables are longitudinally distributed on the crown beam along a line at certain intervals;
s6, when the strength of the wall body concrete reaches 70% of the design strength, filling materials after the wall is filled in layers, and reserving settlement when the height of the wall top exceeds the road shoulder by 0.5 m.
Preferably, in the step S5, when the concrete is poured for the vertical arm, the pouring should be completed once, if there is a break, and the firm adhesion between the newly poured concrete and the poured concrete must be ensured when the concrete is poured for the second time.
Preferably, in the step S5, the width of the expansion joint is 0.02m, and the depth of the joint is not less than 0.2m.
Preferably, in the step S7, the backfilling of the wall back is performed by using a small-sized machine.
Preferably, in the step S7, the overlapping between the tamping fills is not less than 1/3 of the tamping bottom width, the tamping filling starts from the lower part, the tamping is performed by layered backfilling, and the backfilling thickness of each layer is not more than 0.3m.
(III) beneficial effects
The invention provides a newly-built cantilever retaining wall-existing pile plate wall roadbed slope width combined structure. The beneficial effects are as follows:
the invention adopts the added existing pile plate type retaining wall (consisting of pile bodies and retaining plates), the newly added crown beam, the newly built cantilever retaining wall and the cable-stayed prestressed anchor cable. The pile plate type retaining wall is arranged at the toe of the existing embankment for slope collection, and when a subsequent newly-built line is closely connected with the existing embankment for laying and is limited by the terrain condition, the roadbed slope width can be improved on the existing embankment slope. In order to ensure the stability of the wide embankment, a new cantilever retaining wall is arranged on the inner side of the top of the existing pile plate retaining wall. Meanwhile, in order to ensure the stability of the existing embankment, the existing pile plate wall cannot be removed. In addition, in order to reduce the influence of lateral pressure generated by the dead weight of the upper filling embankment and the soil retaining structure on the stress and stability of the existing retaining structure, a crown beam is arranged at the top of the existing pile plate wall, the integrity of the pile plate wall is improved, and then the cable-stayed prestressed anchor cables are additionally arranged in the crown beam at certain intervals along the longitudinal direction of the line so as to balance the newly-increased lateral pressure. The combined structure is formed by the existing pile plate wall and the newly-built cantilever retaining wall, the combined retaining structures cooperate with each other to share the external load, and the bearing function of the existing pile plate wall is fully exerted.
Drawings
FIG. 1 is a schematic cross-sectional view of an existing pile-plate retaining wall of the present invention;
FIG. 2 is a schematic elevation view of an existing pile sheet wall-newly-built cantilever retaining wall composite structure according to the present invention;
FIG. 3 is a schematic side view of an existing piling slab wall-newly-built cantilever retaining wall composite structure of the present invention;
fig. 4 is a schematic view of a novel fastening head for adding a prestressed anchor rope to an existing pile-plate type retaining wall.
1, an existing pile plate type retaining wall; 2. newly-built cantilever retaining wall; 3. a crown beam; 4. a cable-stayed prestressed anchor cable; 5a, standing arms; 5b, toe board; 5c, heel plate; 5d, tenons; 6. namely, a embankment side slope; 7. a step; 8. anchor cable holes; 9. an expansion joint; 10. PVC plastic drain pipe; 11. a reverse filtration layer; 12. a horizontal plane; 13. cement anchor piers; 14. a steel backing plate; 15. an anchor; 16. road shoulders.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
as shown in fig. 1-4, the embodiment of the invention provides a newly-built cantilever type retaining wall-existing pile plate wall roadbed slope width combined structure, which comprises an existing pile plate type retaining wall 1, a newly-built cantilever type retaining wall 2, a crown beam 3 and a newly-added diagonal pre-stressed anchor cable 4, wherein the crown beam 3 is arranged at the top of a pile body of the existing pile plate type retaining wall 1, the newly-built cantilever type retaining wall 2 is arranged at the inner side of the top of the crown beam 3, and the newly-added diagonal pre-stressed anchor cable 4 is arranged on the newly-added crown beam 3.
The newly-built cantilever retaining wall 2 is divided into a vertical arm 5a, a toe plate 5b, a heel plate 5c and a tenon 5d, the lower part of the outer side wall of the vertical arm 5a is fixedly connected with the toe plate 5b, the lower part of the inner side wall of the vertical arm 5a is fixedly connected with the heel plate 5c, the bottom end of the vertical arm 5a is fixedly connected with the tenon 5d, the expansion joint 9 is arranged at the segmentation position of the newly-built cantilever retaining wall 2, a certain number of water discharge holes are formed at a certain distance from the vertical arm 5a to the wall top, a PVC plastic drain pipe 10 is arranged in the vertical arm 5a, and a reverse filtering layer 11 is arranged at the top of the heel plate 5c and the outer side of the vertical arm 5 a.
The cable-stayed prestressed anchor cable 4 consists of a fastening head, a free section and an anchoring section, wherein the fastening head consists of a cement anchor pier 13, a steel backing plate 14 and an anchorage device 15, 4-8 strands of steel strands are adopted as the prestressed anchor cable 4, the top end of the cable-stayed prestressed anchor cable 4 is fixedly connected inside a crown beam reserved anchor cable hole 8, the other side of the steel backing plate 14 is connected on one side of the anchorage device 15, and an included angle theta is formed between the cable-stayed prestressed anchor cable 4 and a horizontal plane 12.
A construction method for a newly-built cantilever retaining wall-existing pile plate wall roadbed side width combined structure comprises the following construction steps:
s1, digging a step 7 on an existing embankment slope 6, wherein the width of the step 7 is not more than 1.5m, the height of the step 7 is 1.0m, and setting a 4% inward inclined slope when the step 7 is dug, leveling and compacting a slope soil body, so as to prepare for adding a crown beam 3 and newly-built cantilever retaining wall 2;
s2, chiseling and cleaning concrete with the height of 0.5m at the top of the existing pile body before the construction of the crown beam 3, adopting steel bars with the diameter identical to that of the pile body to weld with longitudinal steel bars around the pile body, recovering to pour the existing pile body to the designed elevation after the welding is finished, extending the longitudinal steel bars of the extension pile body into the crown beam, ensuring that the extending length meets the related specification requirements, constructing the crown beam 3 by adopting a full-hall type bracket method after the concrete strength of the existing pile body meets the design requirements, and reserving anchor cable holes 8 according to the design positions when pouring the crown beam;
s3, after the concrete strength of the crown beam 3 reaches the design strength, coarse-grained soil is adopted to backfill and compact the subgrade after the crown beam until the subgrade is level with the top surface of the crown beam 3, the bearing capacity of the compacted soil layer is ensured to meet the requirement of the retaining wall on the bearing capacity of the foundation, and then a C25 concrete cushion layer with the thickness of 10cm is poured for leveling to serve as a newly-built cantilever retaining wall reinforcement binding operation surface;
s4, newly-built cantilever type retaining wall 2 wall pouring should be constructed in a segmented mode, the segmented length is not more than 10m, when the retaining wall bottom plate and wall steel bars are bound, the bottom plate and the vertical arms 5a concrete are poured by the vertical templates, the size and the position of tenons 5d are not changed, the mortice concrete of the tenons should be poured simultaneously with the bottom plate concrete, the vertical arms 5a are provided with expansion joints 9 at segmented positions, the vertical arms 5a are a certain distance away from the wall top and are provided with a water draining hole every 2m longitudinally, PVC plastic drain pipes 10 with phi of 10cm are pre-buried, a layer of 0.3m thick bagged sand-sandwiched pebble inverted filter layer 11 is paved behind the wall, when concrete pouring for the vertical arms 5a is finished by one-time pouring, if the concrete pouring is interrupted, the concrete pouring for the second time must be firmly bound, the joint width of the expansion joints 9 is 0.02m, the asphalt concrete is filled along the top, inner and outer three layers of the joint is not less than 0.2m;
s5, arranging a cable-stayed pre-stressing anchor cable 4 in a crown beam reserved anchor cable hole 8, wherein the lower end of the cable-stayed pre-stressing anchor cable 4 is anchored in the existing embankment stabilized rock soil body, the upper end of the cable-stayed pre-stressing anchor cable 4 is connected with the crown beam 3, an included angle theta is formed between the cable-stayed pre-stressing anchor cable 4 and a horizontal plane 12, and the cable-stayed pre-stressing anchor cable 4 is longitudinally distributed on the crown beam 3 along a line at a certain interval;
and S6, when the strength of the wall concrete reaches 70% of the design strength, filling materials after the wall is filled in layers, wherein the height of the wall top exceeds 160.5m of a road shoulder, and settlement is reserved, in the S7 step, the backfilling of the wall back adopts a small machine to tamp, in the S7 step, the overlapping between the tamping and the tamping is not less than 1/3 of the tamping bottom width, the tamping and the tamping are started from the lower part, and the backfilling thickness of each layer is not more than 0.3m.
The engineering requirements under different conditions are met by changing the height of the newly-built cantilever retaining wall, the spacing, the number and the like of the prestressed anchor cables.
The invention is suitable for the terrain-limited section, and a new cantilever retaining wall is additionally arranged on the inner side of the top of the existing pile plate retaining wall, so that the width of the roadbed is realized, and the new land for collection is not required. In order to ensure the safe service of the existing pile plate type retaining wall under the action of the newly added load, a diagonal prestress anchor cable is applied to the wall top to strengthen and utilize the pile plate type retaining wall, and the combined retaining structure cooperatively acts to share the lateral pressure together. The existing engineering is utilized to the maximum extent, so that the investment is saved and the construction risk is reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a newly-built cantilever type retaining wall-existing stake sheet wall roadbed group wide integrated configuration, includes existing stake board-like retaining wall (1), newly-built cantilever type retaining wall (2), roof beam (3) and newly-increased cable-stayed prestressed anchorage cable (4), its characterized in that: the novel pile plate type retaining wall is characterized in that a crown beam (3) is arranged at the top of a pile body of the existing pile plate type retaining wall (1), a newly-built cantilever type retaining wall (2) is arranged on the inner side of the top of the crown beam (3), and a newly-increased diagonal prestress anchor cable (4) is arranged on the newly-increased crown beam (3).
2. A newly-built cantilever retaining wall-existing pile-slab-wall subgrade-width composite structure according to claim 1, characterized in that: newly-built cantilever retaining wall (2) divide into arm (5 a), toe board (5 b), heel board (5 c) and tongue (5 d), arm (5 a) lateral wall lower part fixedly connected with toe board (5 b), arm (5 a) inside wall lower part fixedly connected with heel board (5 c), arm (5 a) bottom fixed connection tongue (5 d), newly-built cantilever retaining wall (2) set up expansion joint (9) in segmentation department, arm (5 a) are provided with the drain hole of a certain quantity apart from the wall top, arm (5 a) inside is provided with PVC plastics drain pipe (10), heel board (5 c) top and arm (5 a) outside are provided with anti-filtering layer (11).
3. A newly-built cantilever retaining wall-existing pile-slab-wall subgrade-width composite structure according to claim 1, characterized in that: the cable-stayed prestressed anchor cable (4) consists of a fastening head, a free section and an anchoring section, wherein the fastening head consists of a cement anchor pier (13), a steel backing plate (14) and an anchorage device (15), 4-8 strands of steel strands are adopted for the prestressed anchor cable (4), the top end of the cable-stayed prestressed anchor cable (4) is fixedly connected inside a crown beam reserved anchor cable hole (8), the other side of the steel backing plate (14) is connected to one side of the anchorage device (15), and an included angle theta is formed between the cable-stayed prestressed anchor cable (4) and a horizontal plane (12).
4. A construction method of a newly-built cantilever retaining wall-existing pile-sheet wall subgrade wide combination structure according to any one of claims 1 to 3, characterized by: the construction method comprises the following construction steps:
s1, digging a step (7) on an existing embankment side slope (6), wherein the width of the step (7) is not more than 1.5m, and the height of the step (7) is 1.0m, setting 4% of inward inclined gradient when the step (7) is dug, leveling and compacting a side slope soil body, and preparing for adding a crown beam (3) and a newly-built cantilever retaining wall (2);
s2, chiseling and cleaning concrete with the height of 0.5m at the top of the existing pile body before constructing the crown beam (3), adopting steel bars with the diameter identical to that of the pile body to be welded with longitudinal steel bars around the pile body, recovering to pour the existing pile body to the designed elevation after the welding is completed, extending the longitudinal steel bars of the extension pile body into the crown beam, wherein the extending length meets the related specification requirements, constructing the crown beam (3) by adopting a full-hall bracket method after the concrete strength of the existing pile body meets the design requirements, and reserving anchor cable holes (8) according to the design positions when pouring the crown beam;
s3, after the concrete strength of the crown beam (3) reaches the design strength, coarse-grained soil is adopted to backfill and compact the subgrade after the crown beam until the subgrade is level with the top surface of the crown beam (3), the bearing capacity of the compacted soil layer is ensured to meet the requirement of the retaining wall on the bearing capacity of the foundation, and then a C25 concrete cushion layer with the thickness of 10cm is poured for leveling to serve as a newly-built cantilever retaining wall reinforcement binding operation surface;
s4, pouring the newly-built cantilever type retaining wall (2) wall body, wherein the construction is carried out in sections, the section length is not more than 10m, after the retaining wall bottom plate and wall body steel bars are bound, pouring the bottom plate and the vertical arm (5 a) concrete by a vertical template, the size and the position of a tenon (5 d) cannot be changed, pouring the mortice concrete and the bottom plate concrete at the same time, arranging an expansion joint (9) at the section position by the vertical arm (5 a), arranging a drainage hole at a certain distance from the vertical arm (5 a) to the wall top and every 2m along the longitudinal direction, pre-burying a PVC plastic drain pipe (10) with phi of 10cm, and paving a layer of 0.3m thick bagged sand-sanded pebble inverted filter layer (11) behind the wall;
s5, arranging the cable-stayed prestressed anchor cables (4) in the reserved anchor cable holes (8) of the crown beams (3), wherein the lower ends of the cable-stayed prestressed anchor cables (4) are anchored in the existing embankment stabilized rock soil, the upper ends of the cable-stayed prestressed anchor cables are connected with the crown beams (3), the cable-stayed prestressed anchor cables (4) form an included angle theta with a horizontal plane (12), and the cable-stayed prestressed anchor cables (4) are longitudinally distributed on the crown beams (3) along a line at certain intervals;
s6, when the strength of the wall body concrete reaches 70% of the design strength, filling materials after the wall is filled in layers, and reserving settlement when the height of the wall top exceeds the road shoulder (16) by 0.5 m.
5. The construction method of the newly-built cantilever retaining wall-existing pile-slab-wall roadbed slope width combined structure according to claim 4, which is characterized by comprising the following steps: in the step S4, when the concrete is poured for the vertical arm (5 a), the pouring should be completed once, if the concrete is interrupted, and the firm bonding between the newly poured concrete and the poured concrete must be ensured when the concrete is poured for the second time.
6. The construction method of the newly-built cantilever retaining wall-existing pile-slab-wall roadbed slope width combined structure according to claim 4, which is characterized by comprising the following steps: in the step S4, the width of the expansion joint (9) is 0.02m, asphalt hemp bars are filled in the joint along the top, the inner layer and the outer layer of the wall, and the depth is not less than 0.2m.
7. The construction method of the newly-built cantilever retaining wall-existing pile-slab-wall roadbed slope width combined structure according to claim 4, which is characterized by comprising the following steps: in the step S6, the wall back is backfilled by a small machine tool.
8. The construction method of the newly-built cantilever retaining wall-existing pile-slab-wall roadbed slope width combined structure according to claim 4, which is characterized by comprising the following steps: in the step S6, the overlapping between the tamping fills is not smaller than 1/3 of the tamping bottom width, the tamping fills are started from the lower part, backfilling is conducted in layers, and the tamping thickness of each backfilling layer is not larger than 0.3m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210047158.9A CN114922017B (en) | 2022-01-17 | 2022-01-17 | Newly-built cantilever type retaining wall-existing stake board wall roadbed group wide integrated configuration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210047158.9A CN114922017B (en) | 2022-01-17 | 2022-01-17 | Newly-built cantilever type retaining wall-existing stake board wall roadbed group wide integrated configuration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114922017A CN114922017A (en) | 2022-08-19 |
| CN114922017B true CN114922017B (en) | 2024-02-06 |
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| CN202210047158.9A Active CN114922017B (en) | 2022-01-17 | 2022-01-17 | Newly-built cantilever type retaining wall-existing stake board wall roadbed group wide integrated configuration |
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