CN117845831A - River bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure and construction method - Google Patents
River bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure and construction method Download PDFInfo
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- CN117845831A CN117845831A CN202311708650.7A CN202311708650A CN117845831A CN 117845831 A CN117845831 A CN 117845831A CN 202311708650 A CN202311708650 A CN 202311708650A CN 117845831 A CN117845831 A CN 117845831A
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- 239000002131 composite material Substances 0.000 title claims abstract description 92
- 239000011435 rock Substances 0.000 title claims abstract description 39
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 230000008093 supporting effect Effects 0.000 title claims description 53
- 239000002689 soil Substances 0.000 claims description 21
- 238000009412 basement excavation Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000004873 anchoring Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000007596 consolidation process Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 description 17
- 230000002787 reinforcement Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 10
- 238000005553 drilling Methods 0.000 description 7
- 230000002411 adverse Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/128—Coherent linings made on the spot, e.g. cast in situ, extruded on the spot
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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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
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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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
-
- 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
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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
- E02D5/22—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
- 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
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
-
- 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
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention provides a composite retaining structure of a river bank ultra-high soil-rock mixed upright slope and a construction method. The inner side retaining structure and the outer side retaining structure of the invention are deep into the wall bottom of the composite retaining wall to a certain depth, and the anti-overturning capability of the composite retaining wall is greatly improved through the embedding effect of the inner side retaining structure and the outer side retaining structure on the wall bottom. The foundation pit retaining structure and the wall body are combined to form the composite retaining wall, so that the anti-overturning capacity of the composite retaining wall is greatly improved, the reinforced concrete engineering quantity of the composite retaining wall can be reduced, and the dismantling engineering quantity of the reinforced concrete support of the foundation pit can be reduced.
Description
Technical Field
The invention relates to the technical field of side slope support, in particular to a river bank ultra-high soil-rock mixed upright side slope composite support structure and a construction method.
Background
Along with the rapid development of shipping industry in China, more and more river channels need to be widened, ports need to be enlarged, and original river channel revetments need to be excavated for the river channels and the enlarged ports. However, in recent years, urban land resources in China are increasingly tense, buildings in river-like areas are dense, and if a river channel is widened by adopting a slope-releasing excavation mode, a large number of land sign dismantling and immigration settling problems are involved, so that immigration cost is huge, and the influence on society is also great. Therefore, it is necessary to adopt a vertical side wall retaining structure to reduce the excavation range of the river channel and reduce the influence on surrounding buildings and the environment.
The upright sidewall retaining structures can be broadly divided into two categories: foundation pit retaining structures or retaining walls. The foundation pit retaining structure mainly comprises a spray anchor support, a soil nailing wall, a row pile support, a pile anchor support, an underground diaphragm wall, a cement soil retaining wall and the like; the retaining wall mainly comprises a gravity type retaining wall, a counter weight type retaining wall, a cantilever type retaining wall, a buttress type retaining wall, an empty box type retaining wall and the like. For river bank ultra-high soil-rock mixed upright slope (height is more than 30 m), the existing foundation pit retaining structure or retaining wall mainly has the following problems:
(1) The river bank foundation pit retaining structure does not have the condition for implementing the inner support, needs to adopt the structure without the inner support, and is only suitable for supporting the soil side wall with small height
Because the upright side wall of the river bank is closely adjacent to the river channel, the inner supporting structure cannot be implemented, and a supporting structure without inner supporting is needed. When adopting the supporting structures such as the shotcrete support, the soil nailing wall, the row pile support, the pile anchor support, the underground continuous wall, the cement soil retaining wall and the like, the method is only suitable for the soil upright slope support with the height less than 6 m. Even if double piles or grid underground continuous wall supports are adopted, the support is only suitable for soil upright slope supports with the height less than 12 m.
(2) The retaining wall foundation needs to be excavated to form temporary side slopes, and the influence on surrounding buildings is large
The retaining wall needs to rely on its own weight or the weight of the floor filling to maintain structural stability, and the ultra-high retaining wall foundation must sit on a stable bedrock. Therefore, the retaining wall is required to be excavated to the foundation elevation of the retaining wall before pouring, the foundation platform is required to be excavated on the side close to the shore to form a temporary side slope, and the retaining wall is filled with soil for recovery after the concrete structure of the retaining wall is poured. Because the temporary side slope of the retaining wall has a larger excavation range, the temporary side slope has larger influence on surrounding buildings, and the buildings in the influence range need to be characterized and disassembled, so that the land-marking cost is huge.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a river bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure and a construction method.
In order to solve the technical problems, in a first aspect, the invention provides a composite retaining structure of a river bank ultra-high soil-rock mixed upright slope, which comprises an inner retaining structure and an outer retaining structure which are parallel to the length direction of the slope, wherein the outer retaining structure is arranged on the river side of the inner retaining structure, a foundation pit is excavated between the inner retaining structure and the outer retaining structure, a composite retaining wall is arranged in the foundation pit, and the composite retaining wall is connected with the inner retaining structure and the outer retaining structure into a whole.
Further, the bottom of the composite retaining wall extends into bedrock, and the bottoms of the inner side retaining structure and the outer side retaining structure extend below the slope excavation depth.
Further, the composite retaining wall comprises a wall body and a foundation pit retaining structure;
the foundation pit retaining structure comprises a crown beam and an enclosing purlin, wherein the crown beam is arranged at the top of the inner retaining structure and the outer retaining structure, the enclosing purlin is arranged between the inner retaining structure and the outer retaining structure, and transverse supports are arranged in the crown beam and the enclosing purlin;
the wall body comprises a bottom plate, side walls, a transverse retaining wall and a top plate;
the transverse retaining walls are perpendicular to the inner retaining structure and the outer retaining structure, a plurality of transverse retaining walls are arranged, the distance between two adjacent transverse supports along the length direction of the side slope is equal to the distance between the two adjacent transverse retaining walls, and the transverse supports of the enclosing purlin are arranged in the transverse retaining walls;
the side wall is connected with the inner side retaining structure and the outer side retaining structure into a whole through the planted ribs, and the enclosing purlin is arranged in the side wall;
the top of roof and the top parallel and level of roof beam, roof beam and roof pass through the embedded bar and are connected, the horizontal support of roof beam is arranged in the roof.
Further, the transverse retaining wall divides the interior of the composite retaining wall into a plurality of cavities, and soil is filled in the cavities.
Further, the combined retaining wall below sets up the anchor body, set up the stock in the anchor body, the stock is connected with the reinforcing bar in the bottom plate of combined retaining wall.
Further, the inner retaining structure comprises a plurality of high pressure jet grouting piles and a plurality of bored piles, wherein the high pressure jet grouting piles are arranged between two adjacent bored piles.
Further, the outside retaining structure is provided with a baffle close to the river side.
Further, an anchoring device is arranged in the slope surface of the rock slope close to the river side below the wall bottom elevation of the composite retaining wall, a protective surface is arranged on the slope surface of the rock slope close to the river side below the wall bottom elevation of the composite retaining wall, and the bottom of the baffle is arranged at the slope top of the rock slope close to the river side below the composite retaining wall.
In a second aspect, a construction method of a river bank ultra-high soil-rock mixed upright slope composite retaining structure includes:
s1, constructing an inner side supporting and retaining structure and an outer side supporting and retaining structure, wherein the outer side supporting and retaining structure is positioned on the river side of the inner side supporting and retaining structure;
s2, constructing a crown beam and a transverse support of the crown beam at the top of the inner side supporting structure and the outer side supporting structure, wherein the transverse support of the crown beam is perpendicular to the inner side supporting structure and the outer side supporting structure;
s3, excavating a foundation pit between the inner side retaining structure and the outer side retaining structure, and constructing an enclosing purlin and a transverse support of the enclosing purlin in the foundation pit, wherein the transverse support of the enclosing purlin is perpendicular to the inner side retaining structure and the outer side retaining structure;
s4, constructing a bottom plate, a side wall and a transverse retaining wall of the composite retaining wall in the foundation pit, so that an integral structure is formed by the enclosing purlin and the side wall, and an integral structure is formed by the transverse support of the enclosing purlin and the transverse retaining wall; filling soil in the composite retaining wall; constructing a top plate of the composite retaining wall, wherein the top plate of the composite retaining wall is connected with the crown beam into a whole;
s5, excavating a side slope of the outer side supporting and retaining structure close to the river side until the height of the bottom of the composite retaining wall is up; constructing a baffle on the river side of the outer side supporting structure;
s6, excavating a side slope of the outer side supporting and retaining structure close to the river side until the side slope designs the bottom elevation; and constructing an anchoring device in the rock slope near the river side below the wall bottom elevation of the composite retaining wall, and constructing a protective surface on the slope surface.
Further, in step S4, before constructing the bottom plate of the composite retaining wall, consolidation grouting treatment is performed on the bedrock at the bottom of the composite retaining wall, and an anchor rod with an exposed upper end is arranged, so that the anchor rod is connected with the bottom plate of the composite retaining wall.
The beneficial effects of the invention are as follows:
1. the foundation pit retaining structure and the wall body are combined into the composite retaining wall, so that the engineering investment is saved, the anti-overturning capacity of the composite retaining wall is greatly improved, the wall body of the general empty box retaining wall is thicker, and the reinforced concrete engineering quantity is larger. And the composite retaining wall combines the foundation pit retaining structure and the wall body into the composite retaining wall through roughening, embedded bars and bar planting treatment, so that the reinforced concrete engineering quantity of the composite retaining wall can be reduced, and the dismantling engineering quantity of the reinforced concrete support of the foundation pit can be reduced. In addition, the inner side retaining structure and the outer side retaining structure are deep into the bottom of the composite retaining wall to a certain depth, and the anti-overturning capacity of the composite retaining wall is greatly improved through the embedding effect of the inner side retaining structure and the outer side retaining structure on the bottom of the wall.
2. The composite retaining wall is arranged between the inner retaining structure and the outer retaining structure, the composite retaining wall is poured after a foundation pit of the composite retaining wall is excavated to a bedrock, temporary side slopes are not required to be excavated in the whole process, and adverse sedimentation caused by side slope excavation can be effectively controlled under the supporting action of the surrounding purlin and the transverse support of the surrounding purlin.
3. The inner side retaining structure adopts the steel sleeve to follow the drilling, so that the subsidence of the earth surface caused by hole collapse in the process of forming holes of the bored pile can be prevented, and adverse influence on the periphery caused by subsequent outer side retaining structure construction can be prevented after the bored pile concrete reaches the design age to exert the retaining function.
4. According to the invention, a partition supporting mode is adopted, the upper soil slope is supported by a composite retaining wall, the lower rock slope is supported by a spray anchor, so that the overall stability of the slope is improved, and the engineering investment is saved; the inner side retaining structure and the outer side retaining structure extend into bedrock to a certain depth, and the reinforced concrete structures play a role in replacement and reinforcement on the lower rock slope, so that adverse sliding along a weak structural surface in the rock slope can be prevented, and the overall stability of the slope is improved. The rock slope below adopts the anchor spraying supporting structure, so that the height and the engineering quantity of the composite retaining wall above are reduced, and the engineering investment is saved.
Drawings
FIG. 1 is a cross-sectional view of a foundation pit retaining structure of the present invention;
FIG. 2 is a cross-sectional view a-a of FIG. 1;
FIG. 3 is a cross-sectional view of a composite retaining wall according to the present invention;
FIG. 4 is a cross-sectional view of a composite retaining structure according to the present invention;
fig. 5 is a section b-b of fig. 4.
Reference numerals: an inner side retaining structure 1; drilling a filling pile 2; a high pressure jet grouting pile 3; an outer retaining structure 4; pre-buried steel bars 5; a crown bar 6; enclosing purlin 7; a transverse support 8; a bottom plate 9; a side wall 10; a lateral retaining wall 11; a top plate 12; a anchor rod 13; a baffle 14; a facing 15; a pre-stressed anchor line 16; locking the anchor bar piles 17; .
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
As shown in fig. 1, the river channel in a certain area needs to be widened, the height of the river bank exceeds 20m, namely the height of the side slope exceeds 20m, the soil and rock side slope is arranged in the height range needing to be excavated, the composite supporting structure can be used for supporting, the excavation range is reduced, and the influence on surrounding buildings and the environment is reduced.
The embodiment provides a river bank ultra-high soil-rock mixed upright slope composite retaining structure, which comprises an inner retaining structure 1, an outer retaining structure 4 and a composite retaining wall.
As shown in fig. 1, the inner retaining structure 1 and the outer retaining structure 4 are arranged parallel to the length direction of the side slope, the outer retaining structure 4 is arranged on the river side of the inner retaining structure 1,
as shown in fig. 2, the inner side retaining structure 1 comprises a bored pile 2 and a high-pressure jet grouting pile 3, wherein the top elevation of the bored pile 2 is a slope top elevation, the pile bottom Gao Chengying is 2m below the river channel excavation elevation, the requirement of the embedded length of the bored pile is met, the sleeve is adopted to follow the bored hole, and adverse effects such as ground subsidence and the like caused by hole collapse in the boring process are prevented. The high-pressure jet grouting piles 3 are arranged between the bored piles 2 to prevent water seepage and soil flowing during foundation pit excavation.
The outer supporting structure 4 comprises an underground continuous wall, the wall top elevation is a slope top elevation, the wall bottom elevation is not less than 2m deep below the river channel excavation elevation, and the requirement of the embedded length of the underground continuous wall is met. The baffle 14 is arranged on the river side of the outer supporting and retaining structure 4.
A foundation pit is excavated between the inner supporting structure 1 and the outer supporting structure 4, and the excavation construction of the foundation pit is carried out from top to bottom until the foundation pit is excavated to breeze bedrock. The composite retaining wall is arranged in the foundation pit and comprises a wall body and a foundation pit retaining structure;
the foundation pit retaining structure comprises a crown beam 6 and enclosing purlins 7, wherein the crown beam 6 is arranged at the top of the inner retaining structure 1 and the outer retaining structure 4, the enclosing purlins 7 are arranged on opposite sides between the inner retaining structure 1 and the outer retaining structure 4, a plurality of enclosing purlins 7 are vertically arranged, the distance between two adjacent enclosing purlins 7 along the vertical direction is 4m, a plurality of transverse supports 8 are respectively arranged in the crown beam 6 and the enclosing purlins 7, and the horizontal distance between the adjacent transverse supports 8 is 6 m-8 m; and the crown beam 6, the enclosing purlin 7 and the transverse support 8 are respectively provided with embedded bars 5 so as to be connected with the wall body of the composite retaining wall into a whole.
As shown in fig. 3 and 5, the wall body comprises a bottom plate 9, a side wall 10, a transverse retaining wall 11 and a top plate 12, the side wall 10 is connected with the inner side retaining structure 1 and the outer side retaining structure 4 into a whole through planting ribs, the width of the bottom plate 9 is the distance between the inner side retaining structure 1 and the outer side retaining structure 4, the transverse retaining wall 11 is perpendicular to the inner side retaining structure 1 and the outer side retaining structure 4, the transverse retaining wall 11 is provided with a plurality of enclosing purlins 7, the enclosing purlins 7 are arranged in the side wall 10, embedded steel bars 5 of the enclosing purlins 7 are welded with steel bars in the side wall 10, the embedded steel bars 5 of the crown beams 6 are welded with steel bars in the top plate 12, the embedded steel bars 5 of the crown beams 6 are flush with the top plate 12, the transverse supports 8 of the crown beams 6 are arranged in the top plate 12, the transverse supports 8 of the crown beams 6 are welded with steel bars in the top plate 12, and the embedded steel bars 5 of the transverse supports 8 of the enclosing purlins 7 are welded with steel bars in the top plate 12. The transverse retaining wall 11 divides the interior of the composite retaining wall into a plurality of cavities, soil is filled in the cavities in a layering manner and is rolled compactly, and the stability of the composite retaining wall is improved by means of the weight of the filled soil.
The reinforcing body is arranged below the bottom plate 9 and is formed by consolidation grouting treatment of rocks below the bottom plate 9, the anchor rod 13 is arranged in the reinforcing body, the anchor rod 13 is exposed for 1.2m and is provided with a 0.5m hook, and the hook of the anchor rod 13 is welded with the steel bars in the bottom plate 9 so as to increase the anti-overturning capacity of the wall structure.
As shown in fig. 4, the baffle 14 on the outer supporting structure 4 is arranged at the top of the rock slope below the composite retaining wall, and for the rock slope below the composite retaining wall, an anchoring device is used for reinforcing after excavation, the anchoring device comprises a prestressed anchor cable 16, a locking anchor bar pile 17 and an anchor rod 13, a protecting surface 15 is arranged on the slope of the rock slope, and the protecting surface 15 is reinforced concrete plate.
The position of the outer supporting structure 4 is determined according to the side slope excavation boundary, the position of the inner supporting structure 1 is determined according to the excavation height, and the distance between the inner supporting structure and the outer supporting structure 4 is 0.6-0.8 times of the supporting height.
The construction method of the river bank ultra-high soil-rock mixed upright slope composite retaining structure comprises the following steps:
s1, constructing an inner side supporting and retaining structure 1;
and (3) constructing a bored pile 2: the pile bottom Gao Chengying of the bored pile 2 is not less than 2m deep below the river channel excavation elevation, and the requirement of the embedded length of the bored pile is met. And (3) constructing the bored pile 2 in sequence, firstly constructing a single-number bored pile, and then constructing a double-number bored pile. The method comprises the following steps:
(1) drilling. The covering layer adopts impact drilling or grabbing drilling, steel casing is adopted to drill holes, bedrock adopts rotary drilling to drill holes, and drilling is stopped after the height of the bottom of the holes is designed.
(2) And cleaning the bottom of the hole. And (3) checking the hole depth, the hole position, the hole shape, the hole diameter and the like, and cleaning the sediment at the bottom of the drilled hole after the final hole checking completely meets the design requirement.
(3) And (5) lowering a reinforcement cage. Prefabricating an underground diaphragm wall reinforcement cage in advance, and pre-burying connecting reinforcements of the underground diaphragm wall reinforcement cage and a box-type retaining wall bottom plate 9. And vertically hanging the prefabricated reinforcement cage into the bored concrete pile hole, positioning and fixing.
(4) And pouring underwater concrete. The guide pipe is used for pouring concrete, the guide pipe is buried in the concrete for 2 m-6 m, the poured concrete is continuously constructed, and the guide pipe is not stopped in the middle.
And (3) constructing a high-pressure jet grouting pile: and a high-pressure jet grouting pile 3 is implemented on one side of the bored pile 2 far away from a river channel, so that water seepage and soil flowing during excavation of a foundation pit are prevented. The space between the high-pressure jet grouting piles 3 is the same as that between the bored piles 2, the high-pressure jet grouting piles are arranged between the bored piles 2, extend into the bedrock by 2m, and the pile diameter is 1.2m.
Constructing an outer side supporting and retaining structure 4;
the outer supporting structure 4 is an underground continuous wall, the elevation of the wall bottom of the underground continuous wall should be deep 2m below the elevation of the river channel excavation, and the requirement of the embedded length of the underground continuous wall is met. The underground diaphragm wall is constructed by dividing the groove sections, and a groove section is arranged at 7.5m generally, and the construction is carried out one by one groove section. The method comprises the following steps:
(1) and (5) guiding wall construction. And constructing a guide wall along the longitudinal axis of the continuous wall before the groove section is excavated, and pouring reinforced concrete.
(2) And (5) grooving construction. The covering layer adopts a grab bucket to form grooves, a groove milling machine is adopted to carry out groove forming construction after entering the rock stratum, and a mud guard arm is adopted in the groove forming process.
(3) And (5) lowering a reinforcement cage. The reinforcement cage of the bored pile 2 is prefabricated in advance, and the connection reinforcement of the reinforcement cage and the bottom plate 9 of the composite retaining wall is pre-buried in advance. And vertically hanging the prefabricated reinforcement cage into the slot hole of the underground diaphragm wall, positioning and fixing.
(4) And pouring underwater concrete. The guide pipe is used for pouring concrete, the guide pipe is buried in the concrete for 2 m-6 m, the poured concrete is continuously constructed, and the guide pipe is not stopped in the middle.
S2, constructing a crown beam 6 and a transverse support 8 of the crown beam 6 at the tops of the inner supporting structure 1 and the outer supporting structure 4, specifically: and manufacturing the crown beam 6 and a reinforcement cage of the transverse support 8 of the crown beam 6, and embedding connecting reinforcements of the top plate 12 of the composite retaining wall. And after the reinforcement cage is positioned, pouring concrete under the formwork support.
S3, excavating a foundation pit between the inner side retaining structure 1 and the outer side retaining structure 4, and constructing an enclosing purlin and a transverse support 8 of the enclosing purlin in the foundation pit;
and the foundation pit excavation construction is carried out from top to bottom until the foundation pit is excavated to the slightly weathered bedrock. The vertical distance between the surrounding purlin and the transverse support 8 is 4m, and the horizontal distance between the transverse support 8 is 6 m-8 m. After the foundation pit is excavated to be 1m below the elevation of the enclosing purlin, the construction of the enclosing purlin and the transverse support 8 is started. The surrounding purlin and the reinforcement cage of the transverse support 8 are embedded with the connecting reinforcement of the side wall 10 of the composite retaining wall. And after the reinforcement cage is positioned, pouring concrete under the formwork support.
S4, constructing a bottom plate 9, a side wall 10 and a transverse retaining wall 11 of the composite retaining wall in the foundation pit, so that an integral structure is formed by the enclosing purlin and the side wall 10, and an integral structure is formed by a transverse support 8 of the enclosing purlin and the transverse retaining wall 11; filling soil in the composite retaining wall; constructing a top plate 12 of the composite retaining wall, wherein the top plate 12 of the composite retaining wall is connected with the crown beam 6 into a whole; the method comprises the following steps:
(1) and (5) concreting and grouting construction. In order to improve the basic bearing capacity of the bottom plate 9, the bedrock under the bottom plate 9 is concreted and grouted. The space between the concreting grouting holes is 2.5m multiplied by 2.5m, the depth is 4m, and concreting grouting is constructed by adopting a non-cover heavy grouting method.
(2) The system anchor rod 13 is constructed. To increase the anti-capsizing capability, system anchor rods 13 are arranged below the bottom plate 9, the distance is 2.5m multiplied by 2.5m, the length is 6m, the anchor rods 13 are exposed for 1.2m, and 0.5m hooks are arranged.
(3) And constructing a bottom plate 9 and a side wall 10 of the composite retaining wall. The embedded bars 5 of the inner side retaining structure 1, the outer side retaining structure 4, the surrounding purlin and the transverse support 8 of the surrounding purlin are straightened, and the reinforcing mesh of the bottom plate 9 and the side wall 10 is connected with the anchor rods 13 of the embedded bars 5 and the bottom plate 9 in a hooked manner, so that the requirement of the anchoring length of the reinforcing bars is met. And pouring the bottom plate 9, the side wall 10 concrete along the flow direction and perpendicular to the water flow direction from bottom to top.
(4) And (5) filling soil in the composite retaining wall. Filling soil layer by layer from bottom to top, and compacting by rolling.
(5) And constructing the composite retaining wall top plate 12. And straightening the crown beam 6 and the embedded bars 5 of the transverse support 8 of the crown beam 6, connecting the reinforcing mesh of the top plate 12 of the composite retaining wall with the embedded bars 5, ensuring that the reinforcing bars meet the anchoring length requirement, and casting the concrete of the top plate 12 of the retaining wall.
S5, excavating a side slope of the outer side supporting and retaining structure 4 close to the river side until the height of the bottom of the composite retaining wall is up; cleaning scum on the surface of the outer support structure 4, roughening the surface of the outer support structure 4, arranging HRB400phi 28mm dowel bars with the length of 40cm and the interval distance of 50cm multiplied by 50cm, embedding the dowel bars into the outer support structure 420cm, and exposing the dowel bars for 20cm. Binding a reinforcing mesh on the outer side of the outer side retaining structure 4, and pouring concrete to form a baffle 14.
S6, excavating a side slope of the outer side supporting and retaining structure 4 close to the river side until the side slope designs the bottom elevation; an anchor device is constructed in a rock slope near the river side below the elevation of the bottom of the composite retaining wall, and a facing 15 is constructed on the slope. The method comprises the following steps:
(1) and excavating and constructing a bedrock slope. And excavating a bedrock side slope from top to bottom, wherein the distance between the opening line of the side slope and the boundary of the composite retaining wall is not less than 3m, and excavating until the side slope reaches the design bottom elevation of the side slope.
(2) And (5) slope support construction. The prestress anchor cable 16, the fore shaft anchor bar pile 17 and the anchor rod 13 are sequentially implemented, the fore shaft anchor bar pile 17 and the system anchor rod 13 are exposed for 1m, a 0.3m long hook is arranged, the fore shaft anchor bar pile 17 and the anchor rod 13 hook are connected with a reinforcing steel bar net of the facing 15, and finally panel concrete is poured to form the facing 15.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A river bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure is characterized in that: including inboard retaining structure (1) and outside retaining structure (4) that are on a parallel with side slope length direction, outside retaining structure (4) set up in the side of leaning on of inboard retaining structure (1), it has the foundation ditch to excavate between inboard retaining structure (1) and the outside retaining structure (4), set up combined retaining wall in the foundation ditch, combined retaining wall links as an organic wholely with inboard retaining structure (1) and outside retaining structure (4).
2. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 1, wherein: the bottom of the composite retaining wall extends into bedrock, and the bottoms of the inner side retaining structure (1) and the outer side retaining structure (4) extend to below the slope excavation depth.
3. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 1, wherein: the composite retaining wall comprises a wall body and a foundation pit retaining structure;
the foundation pit retaining structure comprises a crown beam (6) and an enclosing purlin (7), wherein the crown beam (6) is arranged at the tops of the inner retaining structure (1) and the outer retaining structure (4), the enclosing purlin (7) is arranged between the inner retaining structure (1) and the outer retaining structure (4), and transverse supports (8) are arranged in the crown beam (6) and the enclosing purlin (7);
the wall body is connected with the inner side retaining structure (1) and the outer side retaining structure (4) into a whole through the planting ribs, the enclosing purlin (7) and the transverse support (8) are all arranged in the wall body, and the top of the wall body is connected with the crown beam (6).
4. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 3, wherein: the wall body comprises a transverse retaining wall (11), the transverse retaining wall (11) is perpendicular to the inner retaining structure (1), the transverse retaining wall (11) divides the interior of the composite retaining wall into a plurality of cavities, and soil is filled in the cavities.
5. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 3, wherein: the combined retaining wall is characterized in that a reinforcing body is arranged below the combined retaining wall, an anchor rod (13) is arranged in the reinforcing body, and the anchor rod (13) is connected with steel bars in a bottom plate (9) of the combined retaining wall.
6. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 1, wherein: the inner side retaining structure (1) comprises a plurality of high-pressure jet grouting piles (3) and a plurality of bored cast-in-situ piles (2), and the high-pressure jet grouting piles (3) are arranged between two adjacent bored cast-in-situ piles (2).
7. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 1, wherein: the outside retaining structure (4) is provided with a baffle (14) close to the river side.
8. The river bank ultra-high earth-rock mixed upright slope composite retaining structure according to claim 7, wherein: an anchoring device is arranged in the slope surface of the rock slope close to the river side below the wall bottom elevation of the composite retaining wall, a protective surface (15) is arranged on the slope surface of the rock slope close to the river side below the wall bottom elevation of the composite retaining wall, and the bottom of the baffle (14) is arranged on the slope top of the rock slope close to the river side below the composite retaining wall.
9. A construction method of a river bank ultra-high soil-rock mixed upright slope composite retaining structure is characterized by comprising the following steps: comprising the following steps:
s1, constructing an inner side supporting structure (1) and an outer side supporting structure (4), wherein the outer side supporting structure (4) is positioned on the river side of the inner side supporting structure (1);
s2, constructing a crown beam (6) and a transverse support (8) of the crown beam (6) at the tops of the inner side supporting structure (1) and the outer side supporting structure (4), wherein the transverse support (8) of the crown beam (6) is perpendicular to the inner side supporting structure (1) and the outer side supporting structure (4);
s3, excavating a foundation pit between the inner side retaining structure (1) and the outer side retaining structure (4), and constructing an enclosing purlin and a transverse support (8) of the enclosing purlin in the foundation pit, wherein the transverse support (8) of the enclosing purlin is perpendicular to the inner side retaining structure (1) and the outer side retaining structure (4);
s4, constructing a bottom plate (9), a side wall (10) and a transverse retaining wall (11) of the composite retaining wall in the foundation pit, so that an integral structure is formed by the enclosing purlin and the side wall (10), and an integral structure is formed by a transverse support (8) of the enclosing purlin and the transverse retaining wall (11); filling soil in the composite retaining wall; constructing a top plate (12) of the composite retaining wall, wherein the top plate (12) of the composite retaining wall is connected with the crown beam (6) into a whole;
s5, excavating a side slope of the outer side supporting and retaining structure (4) close to the river side until the height of the bottom of the composite retaining wall is up; a baffle (14) is constructed on the outer side of the supporting and retaining structure (4) close to the river side;
s6, excavating a side slope of the outer side supporting and retaining structure (4) close to the river side until the side slope designs the bottom elevation; an anchor device is constructed in a rock slope near the river side below the elevation of the wall bottom of the composite retaining wall, and a protective surface (15) is constructed on the slope surface.
10. The construction method of the river bank ultra-high soil-rock mixed upright slope composite retaining structure according to claim 9, wherein the construction method comprises the following steps: in the step S4, before constructing the bottom plate (9) of the composite retaining wall, consolidation grouting treatment is carried out on bedrock at the bottom of the composite retaining wall, and an anchor rod (13) with the exposed upper end is arranged, so that the anchor rod (13) is connected with the bottom plate (9) of the composite retaining wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311708650.7A CN117845831A (en) | 2023-12-13 | 2023-12-13 | River bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311708650.7A CN117845831A (en) | 2023-12-13 | 2023-12-13 | River bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure and construction method |
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| CN202311708650.7A Pending CN117845831A (en) | 2023-12-13 | 2023-12-13 | River bank ultra-high soil-rock mixed upright slope composite supporting and retaining structure and construction method |
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| CN (1) | CN117845831A (en) |
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