CN114922017A - Newly-built cantilever type retaining wall-existing pile sheet wall roadbed slope wide integrated configuration - Google Patents
Newly-built cantilever type retaining wall-existing pile sheet wall roadbed slope wide integrated configuration Download PDFInfo
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- 238000000034 method Methods 0.000 claims abstract description 10
- 239000004567 concrete Substances 0.000 claims description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 15
- 239000002689 soil Substances 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 229920003023 plastic Polymers 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000010426 asphalt Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
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- 230000009466 transformation Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 238000002407 reforming 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
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Abstract
The invention provides a newly-built cantilever type retaining wall-existing pile plate wall roadbed slope width combined structure, and relates to the technical field of roadbed widening and reconstruction engineering of existing lines of highways and railways. This newly-built cantilever type retaining wall-existing pile sheet wall road bed group width integrated configuration, including existing pile sheet type retaining wall, newly-built cantilever type retaining wall, crown beam and newly-increased pre-stressed anchor cable that draws to one side, existing pile sheet type retaining wall pile body top sets up crown beam, and newly-built cantilever type retaining wall sets up the inboard at crown beam top, newly-increased pre-stressed anchor cable that draws to one side sets up on newly-increased crown beam. The top of the existing pile plate wall is provided with the crown beam to increase the integrity of the pile plate wall, then the diagonal prestressed anchor cables are added in the crown beam at certain intervals along the longitudinal direction of the road, the combined retaining structure acts in a synergistic manner to share the external load, the bearing effect of the existing pile plate wall is fully exerted, the implementation is simple and easy to operate, and the method is suitable for the existing embankment side width transformation project under the condition of limited terrain.
Description
Technical Field
The invention relates to the technical field of widening and reforming engineering of existing line roadbeds of highways and railways, in particular to a roadbed slope wide combined structure of a newly-built cantilever type retaining wall-an existing pile slab wall.
Background
Along with the expansion of the demand of passenger and freight transportation in recent years, the reconstruction of the existing line and the new construction project close to the existing line are gradually increased year by year, particularly, the existing line enters some existing line high embankments of which the city sections are close to the urban trunk road, because of the tense land without slope releasing condition, a retaining structure is often adopted for slope collection, the pile plate type retaining wall has the advantages of flexible pile position arrangement, convenient construction, land saving, low maintenance and repair cost and the like, and is particularly suitable for the projects of stable landslide, slope reinforcement, roadbed widening and the like The stability of antidumping depends on the dead weight of the wall body and the gravity of the filled soil (including load) above the heel plate, and in addition, the tenon arranged at the bottom of the wall can greatly improve the stability of antidumping of the retaining wall.
When existing pile wall foundation width was reformed transform, the safe serviceability of existing pile sheet formula retaining wall under newly-increased load effect can't be guaranteed to current pile sheet formula retaining wall installation form, can't share the lateral pressure, has the lower problem of fastness, and the installation that is difficult to reuse and different regions also need prepare the installation region that corresponds, even need collect the soil and satisfy the construction installation, and application scope is low.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a newly-built cantilever type retaining wall, namely a roadbed slope wide combined structure of an existing pile-slab wall, and solves the problems of low firmness caused by incapability of guaranteeing newly-added loads and low application range caused by the need of modification and construction aiming at different regions.
(II) technical scheme
In order to realize the purpose, the invention is realized by the following technical scheme: the utility model provides a newly-built cantilever type retaining wall-existing pile sheet wall road bed group wide integrated configuration, includes existing pile sheet type retaining wall, newly-built cantilever type retaining wall, guan liang and newly-increased oblique pull prestressed anchorage cable, existing pile sheet type retaining wall pile body top is provided with guanliang, and newly-built cantilever type retaining wall sets up the inboard at guanliang top, newly-increased oblique pull prestressed anchorage cable sets up on newly-increased guanliang.
Preferably, newly-built cantilever type retaining wall divide into and found arm, toe board, heel board and tenon, found arm lateral wall lower part fixedly connected with toe board, found arm lateral wall lower part fixedly connected with heel board, found arm bottom fixed connection tenon, newly-built cantilever type retaining wall sets up the expansion joint in segmentation department, found the arm and be provided with the outlet of a certain amount apart from the wall top certain distance, inside is provided with PVC plastics drain pipe, heel board top and found the arm outside and be provided with the reversed filtration layer.
Preferably, the pre-stressed anchor cable that draws to one side comprises fastening head, free section, anchor section triplex, wherein the fastening head comprises cement anchor mound, steel backing plate and ground tackle, the pre-stressed anchor cable adopts 4 ~ 8 strands of steel strand wires, pre-stressed anchor cable hole inside is reserved to pre-stressed anchor cable of drawing to one side fixed connection at the crown beam to one side of ground tackle to the pre-stressed anchor cable that draws to one side, draw pre-stressed anchor cable and horizontal plane to one side and become an contained angle theta.
Preferably, the construction method of the newly-built cantilever type retaining wall-existing pile-slab wall roadbed slope wide combined structure comprises the following construction steps
S1, digging steps on the existing embankment side slope, wherein the width of each step is not more than 1.5m, the height of each step is 1.0m, and when the steps are dug, setting the inward-inclining slope degree of 4 percent, flattening and compacting the side slope soil body, and preparing for adding crown beams and building a cantilever type retaining wall;
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, welding the concrete with the same diameter as the pile body with longitudinal steel bars around the pile body, pouring the existing pile body to the designed elevation after the welding is finished, extending the longitudinal steel bars of the lengthened pile body into the crown beam, wherein the extending length meets the relevant standard requirements, constructing the crown beam by adopting a full hall type support method after the concrete strength of the existing pile body meets the design requirements, and reserving anchor cable holes according to the designed positions when pouring the crown beam;
s4, backfilling and compacting the roadbed behind the crown beam by coarse-grained soil layer by layer until the roadbed is flush with the top surface of the crown beam after the strength of the crown beam concrete reaches the designed strength and the bearing capacity of the soil layer after compaction meets the requirement of the retaining wall on the bearing capacity of the foundation, and then pouring a C25 concrete cushion layer with the thickness of 10cm for leveling to serve as a steel bar binding working surface of the newly-built cantilever type retaining wall;
s5, the newly-built cantilever type retaining wall body is poured in a subsection mode, the length of the subsection is not more than 10m, after the bottom plate and the wall body of the retaining wall are bound with reinforcing steel bars, a vertical template is used for pouring the bottom plate and vertical arm concrete, the size and the position of a tenon cannot be changed, the mortise concrete and the bottom plate concrete are poured simultaneously, the vertical arm is provided with expansion joints at the subsection position, the vertical arm is at a certain distance from the top of the wall and is provided with a water drainage hole every 2m in the longitudinal direction, a PVC plastic drainage pipe with the diameter of 10cm is pre-buried, and a bagged sand-pebble inverted filter layer with the thickness of 0.3m is laid behind the wall;
s6, arranging the cable-stayed prestressed anchor cables in the reserved anchor cable holes of the crown beams, anchoring the lower ends of the cable-stayed prestressed anchor cables in the existing embankment stable rock-soil body, connecting the upper ends of the cable-stayed prestressed anchor cables with the crown beams, forming an included angle theta between the cable-stayed prestressed anchor cables and the horizontal plane, and longitudinally arranging the cable-stayed prestressed anchor cables on the crown beams at certain intervals along the line;
and S7, when the strength of the wall concrete reaches 70% of the design strength, filling materials after the wall is built in layers, and reserving settlement when the height of the top of the wall exceeds the shoulder of the road by 0.5 m.
Preferably, in the step S5, when concrete is poured into the vertical arm, one-time pouring should be completed, and if there is a break, firm adhesion between the newly poured concrete and the poured concrete must be ensured during the second pouring.
Preferably, in the step S5, the width of the expansion joint is 0.02m, and asphalt reinforcement bars are filled along the wall top, the inner layer and the outer layer in the joint, and the depth is not less than 0.2 m.
Preferably, in the step S7, the back of the wall is backfilled by using a small machine.
Preferably, in the step S7, the overlap between the rammed fillings is not less than 1/3 rammed bottom width, the rammed fillings are backfilled in layers and tamped from the low position, and the backfilling thickness of each layer is not more than 0.3 m.
(III) advantageous effects
The invention provides a newly-built cantilever type retaining wall-existing pile-slab wall roadbed slope wide combined structure. The method has the following beneficial effects:
the invention adds the existing pile plate type retaining wall (composed of pile body and retaining plate), newly-added crown beam, newly-built cantilever type retaining wall and cable-stayed prestressed anchor cable. The existing embankment is provided with the pile-slab retaining wall at the toe for slope collection, and when a subsequent newly-built line is laid close to the existing embankment and is limited by terrain conditions, the roadbed slope width can be reformed on the existing embankment side slope. In order to ensure the stability of the wide embankment, a new cantilever type retaining wall is arranged on the inner side of the top of the existing pile plate type retaining wall. Meanwhile, in order to ensure the stability of the existing embankment, the existing pile plate wall cannot be dismantled. In addition, in order to reduce the influence of the lateral pressure generated by the self weight of the side-filled embankment and the soil retaining structure on the stress and the stability of the existing retaining structure, a crown beam is arranged at the top of the existing pile slab wall to increase the integrity of the pile slab wall, and then a cable-stayed prestressed anchor cable is additionally arranged in the crown beam at a certain interval along the longitudinal direction of the line to balance the newly increased lateral pressure. The combined structure formed by the existing pile plate wall and the newly-built cantilever type retaining wall shares the external load together under the synergistic effect of the combined retaining structure, and fully exerts the bearing effect of the existing pile plate wall.
Drawings
FIG. 1 is a schematic cross-sectional view of an existing sheet pile retaining wall of the present invention;
FIG. 2 is a schematic elevation view of the existing sheet pile wall-newly constructed cantilever retaining wall assembly of the present invention;
FIG. 3 is a schematic side view of the existing sheet pile wall-newly constructed cantilever retaining wall assembly of the present invention;
fig. 4 is a schematic view of the new fastening head of the pre-stressed anchor cable added to the existing pile-slab retaining wall of the present invention.
Wherein, 1, the existing pile-plate retaining wall; 2. building a cantilever type retaining wall; 3. a crown beam; 4. a cable-stayed prestressed anchor cable; 5a, a vertical arm; 5b, toe board; 5c, a heel plate; 5d, tenon; 6. namely, there is a embankment side slope; 7. a step; 8. anchor cable holes; 9. an expansion joint; 10. PVC plastic drain pipe; 11. a reverse filtering layer; 12. a horizontal plane; 13. anchoring the pier with cement; 14. a steel backing plate; 15. an anchorage device; 16. and (4) road shoulders.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1-4, the embodiment of the present invention provides a newly-built cantilever retaining wall-existing pile-slab wall roadbed slope width composite structure, which includes an existing pile-slab retaining wall 1, a newly-built cantilever retaining wall 2, a crown beam 3 and a newly-added cable-stayed prestressed anchor cable 4, wherein the top of the pile body of the existing pile-slab retaining wall 1 is provided with the crown beam 3, the newly-built cantilever retaining wall 2 is arranged on the inner side of the top of the crown beam 3, and the newly-added cable-stayed prestressed anchor cable 4 is arranged on the newly-added crown beam 3.
Newly-built cantilever type retaining wall 2 divide into and found arm 5a, toe board 5b, heel board 5c and tenon 5d, found arm 5a lateral wall lower part fixedly connected with toe board 5b, found arm 5a inside wall lower part fixedly connected with heel board 5c, found arm 5a bottom fixed connection tenon 5d, newly-built cantilever type retaining wall 2 sets up expansion joint 9 in segmentation department, found arm 5a is provided with a certain amount of outlet apart from the wall top certain distance, 5a inside is provided with PVC plastics drain pipe 10, heel board 5c top and found the arm 5a outside and be provided with reversed filter layer 11.
The cable-stayed prestressed anchor cable 4 comprises a fastening head, a free section and an anchoring section, wherein the fastening head comprises a cement anchor pier 13, a steel base 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 reserved anchor cable hole 8 of a crown beam, the other side of the steel base 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.
A construction method for a newly-built cantilever type retaining wall-existing pile plate wall roadbed slope wide combined structure comprises the following construction steps:
s1, digging steps 7 on the existing embankment side slope 6, wherein the width of the steps 7 is not more than 1.5m, the height of the steps 7 is 1.0m, and when the steps 7 are dug, setting 4% of inward-inclined slope degree, flattening and compacting the side slope soil body, and preparing for adding the top beams 3 and building the cantilever type retaining wall 2;
s2, before the construction of the crown beam 3, chiseling and cleaning concrete with the height of 0.5m at the top of the existing pile body, welding the reinforcing steel bars with the same diameter as the pile body with longitudinal reinforcing steel bars around the pile body, after the welding is finished, pouring the existing pile body to a designed elevation, extending the longitudinal reinforcing steel bars of the lengthened pile body into the crown beam, wherein the extending length meets the relevant standard requirement, after the strength of the concrete of the existing pile body meets the design requirement, constructing the crown beam 3 by using a full-hall type support method, and reserving an anchor cable hole 8 according to the designed position when pouring the crown beam;
s4, backfilling and compacting the roadbed behind the crown beam by coarse-grained soil layer by layer until the roadbed is flush with the top surface of the crown beam 3 after the strength of the concrete of the crown beam 3 reaches the designed strength and the bearing capacity of the soil layer after compaction meets the requirement of the retaining wall on the bearing capacity of the foundation, and then pouring a C25 concrete cushion layer with the thickness of 10cm for leveling to serve as a steel bar binding working surface of the newly-built cantilever type retaining wall;
s5, the wall body of the newly-built cantilever type retaining wall 2 is constructed in sections, the length of each section is not more than 10m, after the bottom plate and the wall body reinforcing steel bars of the retaining wall are bound, the bottom plate and the vertical arm 5a concrete are cast by the vertical template, the size and the position of the tenon 5d cannot be changed, the concrete of the mortice and the concrete of the bottom plate are poured at the same time, the expansion joint 9 is arranged at the subsection of the vertical arm 5a, the vertical arm 5a is at a certain distance from the top of the wall and is provided with a water drainage hole every 2m along the longitudinal direction, a PVC plastic drainage pipe 10 with phi of 10cm is pre-embedded, a layer of bagged sand and pebble inverted filter layer 11 with the thickness of 0.3m is paved behind the wall, when the concrete is poured for the vertical arm 5a, the pouring is finished at one time, if the gap exists, when the concrete is poured for the second time, the newly poured concrete and the poured concrete are firmly bonded, the width of the gap 9 is 0.02m, asphalt reinforcing bars are filled in the gap along the top, the inner layer and the outer layer of the wall, and the depth is not less than 0.2 m;
s6, arranging a cable-stayed pre-stressed anchor cable 4 in the reserved anchor cable hole 8 of the crown beam, anchoring the lower end of the cable-stayed pre-stressed anchor cable 4 in the existing embankment stable rock-soil body, connecting the upper end of the cable-stayed pre-stressed anchor cable 4 with the crown beam 3, forming an included angle theta between the cable-stayed pre-stressed anchor cable 4 and the horizontal plane 12, and longitudinally arranging the cable-stayed pre-stressed anchor cable 4 on the crown beam 3 at a certain interval along the road;
s7, when the strength of the wall concrete reaches 70% of the design strength, filling materials after the wall is built in layers, the height of the top of the wall exceeds the shoulder of the road by 160.5m for reserved settlement, in the step S7, the back of the wall is filled by adopting a small machine tool, in the step S7, the overlapping between the filling materials is not less than the bottom tamping width of 1/3, the filling materials are filled in layers and tamped from the lower part, and the thickness of each layer of filling materials is not more than 0.3 m.
The engineering requirements under different conditions are met by changing the height of the newly-built cantilever type retaining wall, the distance between the prestressed anchor cables, the number of the prestressed anchor cables and the like.
The invention is suitable for the terrain-limited section, and the new cantilever type retaining wall is additionally arranged on the inner side of the top of the existing pile-plate type retaining wall, so that the roadbed slope is wide, and the land for collecting is not required to be newly increased. In order to ensure the safe service of the existing pile plate type retaining wall under the action of a newly added load, a cable-stayed prestressed anchor cable is applied to the top of the wall to reinforce and utilize the wall, and the combined retaining structure shares the lateral pressure together under the synergistic action. 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 appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments 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-wide integrated configuration of existing pile sheet wall road bed group, includes existing pile sheet type retaining wall (1), newly-built cantilever type retaining wall (2), crown beam (3) and newly-increased draw prestressed anchorage cable (4) to one side, its characterized in that: existing stake plate retaining wall (1) pile body top is provided with guan liang (3), and newly-built cantilever type retaining wall (2) set up the inboard at guanliang (3) top, newly-increased cable-stayed prestressed anchorage cable (4) set up on newly-increased guanliang (3).
2. The newly-built cantilever type retaining wall-existing pile plate wall roadbed slope wide combined structure of claim 1, wherein: newly-built cantilever type retaining wall (2) divide into and found arm (5 a), toe board (5 b), heel board (5 c) and tenon (5 d), found arm (5 a) lateral wall lower part fixedly connected with toe board (5 b), found arm (5 a) inside wall lower part fixedly connected with heel board (5 c), found arm (5 a) bottom fixed connection tenon (5 d), newly-built cantilever type retaining wall (2) set up expansion joint (9) in segmentation department, found arm (5 a) and be provided with certain quantity's outlet apart from the wall top certain distance, (5 a) inside is provided with PVC plastics drain pipe (10), heel board (5 c) top is provided with anti-filtering layer (11) with found arm (5 a) outside.
3. The newly-built cantilever type retaining wall-existing pile plate wall roadbed slope wide combined structure of claim 1, wherein: the cable-stayed prestressed anchor cable (4) is composed of a fastening head, a free section and an anchoring section, wherein the fastening head is composed of a cement anchor pier (13), a steel base plate (14) and an anchorage device (15), a 4-8 strand steel strand is adopted by the prestressed anchor cable (4), the top end of the cable-stayed prestressed anchor cable (4) is fixedly connected inside a reserved anchor cable hole (8) of a crown beam, the other side of the steel base plate (14) is connected to one side of the anchorage device (15), and the cable-stayed prestressed anchor cable (4) and a horizontal plane (12) form an included angle theta.
4. A construction method for a newly-built cantilever type retaining wall-existing pile plate wall roadbed slope wide combined structure is characterized by comprising the following steps: the method comprises the following construction steps:
s1, digging steps (7) on the existing embankment side slope (6), wherein the width of the steps (7) is not more than 1.5m, the height of the steps (7) is 1.0m, and when the steps (7) are dug, setting 4% of inward-inclined slope degree, flattening and compacting the side slope soil body, and preparing for adding crown beams (3) and building a newly-built cantilever type retaining wall (2);
s2, before the construction of the crown beam (3), chiseling and cleaning concrete with the height of 0.5m at the top of the existing pile body, welding the concrete with the diameter the same as that of the pile body with longitudinal steel bars around the pile body, after the welding is finished, pouring the existing pile body to a designed elevation, extending the longitudinal steel bars of the lengthened pile body into the crown beam, wherein the extending length meets the relevant standard requirement, after the concrete strength of the existing pile body meets the design requirement, constructing the crown beam (3) by adopting a full-hall type support method, and reserving anchor cable holes (8) according to the designed position when pouring the crown beam;
s4, after the concrete strength of the crown beam (3) reaches the design strength, backfilling and compacting the roadbed behind the crown beam layer by coarse-grained soil until the roadbed is flush with the top surface of the crown beam (3), ensuring that the bearing capacity of the compacted soil layer meets the requirement of the retaining wall on the bearing capacity of the foundation, and then pouring a C25 concrete cushion layer with the thickness of 10cm for leveling to serve as a reinforcement binding working surface of the newly-built cantilever type retaining wall;
s5, the newly-built cantilever type retaining wall (2) is subjected to wall body pouring construction in sections, the length of each section is not more than 10m, after a retaining wall bottom plate and a wall body reinforcing steel bar are bound, a vertical template is used for pouring concrete of the bottom plate and a vertical arm (5 a), the size and the position of a tenon (5 d) cannot be changed, the mortise concrete and the bottom plate concrete are poured simultaneously, the vertical arm (5 a) is provided with expansion joints (9) at the section position, the vertical arm (5 a) is away from the wall top for a certain distance and is provided with a water drainage hole every 2m along the longitudinal direction, a PVC plastic drainage pipe (10) with the diameter of 10cm is pre-buried, and a sand-pebble inverted filter layer (11) with the thickness of 0.3m is paved behind the wall in bags;
s6, arranging the cable-stayed prestressed anchor cables (4) in the reserved anchor cable holes (8) of the crown beams, anchoring the lower ends of the cable-stayed prestressed anchor cables (4) in the stable rock-soil body of the existing embankment, connecting the upper ends of the cable-stayed prestressed anchor cables (4) with the crown beams (3), forming an included angle theta between the cable-stayed prestressed anchor cables (4) and a horizontal plane (12), and longitudinally arranging the cable-stayed prestressed anchor cables (4) on the crown beams (3) at certain intervals along a circuit;
and S7, when the strength of the wall concrete reaches 70% of the design strength, filling materials after the wall is built in layers, and reserving settlement when the height of the top of the wall exceeds the shoulder (16) by 0.5 m.
5. The method for constructing a new cantilever retaining wall-existing pile plate wall foundation side wide composite structure according to claim 4, wherein: in the step S5, when concrete is poured into the vertical arm (5 a), one-time pouring should be completed, and if there is a break, firm adhesion between the newly poured concrete and the poured concrete must be ensured during the second pouring.
6. The method of constructing a new retaining wall of cantilever type-existing pile-slab wall foundation wall wide composite structure according to claim 1, wherein: in the step S5, the width of the expansion joint (9) is 0.02m, and asphalt reinforcement bars are filled in the gap along the wall top, the inner layer and the outer layer, and the depth is not less than 0.2 m.
7. The method for constructing a new cantilever retaining wall-existing pile plate wall foundation side wide composite structure according to claim 4, wherein: and in the step S7, backfilling the wall back by adopting a small machine tool for tamping.
8. The method of constructing a new retaining wall of cantilever type-existing pile-slab wall foundation wall wide composite structure according to claim 4, wherein: and in the step S7, overlapping the rammed fillings by no less than 1/3 of rammed bottom width, starting from a low position, backfilling and tamping layer by layer, wherein the backfilling thickness of each layer is not more than 0.3 m.
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| 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 |
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| 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 |
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| CN114922017B CN114922017B (en) | 2024-02-06 |
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