CN111235992A - Slope soft soil foundation cantilever retaining wall reinforcing structure and construction method - Google Patents
Slope soft soil foundation cantilever retaining wall reinforcing structure and construction method Download PDFInfo
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- CN111235992A CN111235992A CN202010187865.9A CN202010187865A CN111235992A CN 111235992 A CN111235992 A CN 111235992A CN 202010187865 A CN202010187865 A CN 202010187865A CN 111235992 A CN111235992 A CN 111235992A
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- 239000002689 soil Substances 0.000 title claims abstract description 65
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 title abstract description 10
- 239000004567 concrete Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005452 bending Methods 0.000 abstract description 9
- 230000000149 penetrating effect Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003908 quality control method Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011065 in-situ storage Methods 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
- 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
- E01C3/04—Foundations produced by soil stabilisation
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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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Abstract
The invention relates to the technical field of geotechnical engineering, in particular to a slope soft soil foundation cantilever retaining wall reinforcing structure and a construction method, wherein the reinforcing structure comprises a cantilever retaining wall, and a positioning hole is formed in the bottom surface of the cantilever retaining wall; the variable cross-section pile foundation is connected below the cantilever retaining wall, a positioning part is arranged on the top surface of the pile body and is in rotating fit with the positioning hole, the cross-sectional size of the positioning part is smaller than that of the top surface of the pile body, and the top surface of the pile body is attached to the bottom surface of the cantilever retaining wall; and the embankment structure is filled on the inner side of the cantilever retaining wall. According to the slope soft soil foundation cantilever retaining wall reinforcing structure, the variable cross-section pile foundation can provide vertical bearing capacity for the cantilever retaining wall, the bending moment effect of the cantilever retaining wall on the variable cross-section pile foundation is greatly reduced due to the rotary fit of the positioning part and the positioning hole, and the horizontal deformation control problem of the slope soft soil foundation is effectively solved due to the fact that the positioning part and the positioning hole are embedded and connected in a penetrating mode; the control problem of vertical uneven settlement of embankment structure and soft soil foundation is solved.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a slope soft soil foundation cantilever retaining wall reinforcing structure and a construction method.
Background
The slope soft soil foundation is widely distributed in hills and mountain areas in China.
As shown in fig. 1, the slope soft soil foundation conditions include hard rock formations 4 and soft earth formations 5, which are generally accompanied by uneven thickness of soft soil distribution and inclined geotechnical boundaries 6, which causes the following problems in embankment construction on the slope soft soil foundation:
(1) the height of the embankment filling body is not uniform, and the filling body can generate uneven compression settlement deformation;
(2) the soft soil foundation is influenced by uneven filling bodies to generate large uneven settlement deformation;
(3) under the load action of the overlying filling body, the lower side of the slope soft soil foundation can generate larger horizontal deformation different from that of the horizontal soft soil foundation, and the stability of the foundation is poorer;
(4) the filling body is subjected to slope shrinkage and reinforcement on a soft soil foundation, the height of a cantilever section of a traditional stressed pile structure is influenced by the thickness of the soft soil, and overlarge horizontal deformation is generally difficult to control;
(5) adopt pile foundation concreties cantilever retaining wall structure, slope topography makes the horizontal force thrust that the pile foundation bore great, and horizontal deformation is difficult to control, and weak soil thickness is big more, and deformation control is difficult more, and cantilever retaining wall concreties for hyperstatic structure with the pile foundation simultaneously, and the design is very complicated, and the moment of bending of transmitting in addition for the pile foundation is big, and pile foundation investment is high.
Disclosure of Invention
The invention aims to: aiming at the problems of large uneven settlement deformation, poor stability and difficulty in controlling horizontal deformation of a soft soil foundation, which are caused by a filling body under the condition of the slope soft soil foundation in the prior art, the slope soft soil foundation cantilever retaining wall reinforcing structure and the construction method are provided, and the problems of vertical uneven settlement control of a embankment structure and the soft soil foundation and horizontal deformation control of the slope soft soil foundation are effectively solved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a slope soft soil foundation cantilever retaining wall reinforced structure comprises,
the cantilever retaining wall is provided with a positioning hole on the bottom surface;
the variable cross-section pile foundation is connected below the cantilever retaining wall and comprises a pile body, a positioning part is arranged on the top surface of the pile body and is in running fit with the positioning hole, the cross-sectional size of the positioning part is smaller than that of the top surface of the pile body, and the top surface of the pile body is attached to the bottom surface of the cantilever retaining wall;
and the embankment structure is filled on the inner side of the cantilever retaining wall.
According to the slope soft soil foundation cantilever retaining wall reinforced structure, the variable cross-section pile foundation is arranged at the bottom of the cantilever retaining wall, the cross-sectional dimension of a positioning part on the variable cross-section pile foundation is smaller than that of the top surface of the pile body, the top surface of the pile body is attached to the bottom surface of the cantilever retaining wall, so that the variable cross-section pile foundation can provide vertical load force for the cantilever retaining wall, in addition, the positioning part is in running fit with the positioning hole, the cantilever retaining wall and the variable cross-section pile foundation are in non-fixed connection, at least one direction of the cantilever retaining wall can rotate relatively, the bending moment effect of the cantilever retaining wall on the variable cross-section pile foundation is greatly reduced, and the structural dimension of the variable cross-section pile; the positioning part is in rotating fit with the positioning hole, so that the variable-section pile foundation and the cantilever retaining wall can be embedded and penetrate to form connection, larger horizontal resistance force can be provided for the cantilever retaining wall to balance the horizontal soil pressure of the embankment structure, and the problem of horizontal deformation control of the slope soft soil foundation is effectively solved; and the cantilever retaining wall structure who sets up has solved embankment structure and soft soil foundation's vertical differential settlement control difficult problem under the effect of variable cross-section stake basis.
In the above scheme, the variable cross section of the variable cross section pile foundation refers to a variable cross section between the pile body and the positioning part.
Preferably, the cantilever retaining wall is provided with a cantilever and a bottom plate which are connected, the cantilever is arranged at the top of the bottom plate, and the variable-section pile foundation is arranged below the bottom plate.
Preferably, the positioning part of the variable cross-section pile foundation below the cantilever is of a column spherical structure, and the column spherical structure is connected with the positioning hole in an embedded mode and can be in running fit with the positioning hole.
Will post spherical structure with the locating hole embedded connection, just post spherical structure can with locating hole normal running fit to for non-fixed connection between messenger's cantilever barricade and the variable cross section stake basis, it has at least one direction and can rotate relatively, greatly reduced cantilever barricade is to the moment of flexure effect that the variable cross section stake basis produced, thereby can optimize the structural dimension on variable cross section stake basis greatly.
In the above scheme, the lower end of the column spherical structure is a cylinder, and the upper end of the column spherical structure is a hemispherical structure.
Preferably, the diameter of the column spherical structure is 50% -70% of the diameter of the top surface of the pile body. Under the condition of guaranteeing the strength of the column spherical structure, the variable-section pile foundation can better provide vertical load force for the cantilever retaining wall.
Preferably, the positioning part of the variable cross-section pile foundation below the embankment structure is a cylindrical structure, and the cylindrical structure is in running fit with the corresponding positioning hole. Therefore, the cantilever retaining wall and the variable-section pile foundation are in non-fixed connection, at least one direction of the cantilever retaining wall and the variable-section pile foundation can rotate relatively, the bending moment effect of the cantilever retaining wall on the variable-section pile foundation is greatly reduced, and the structural size of the variable-section pile foundation can be greatly optimized.
Preferably, the positioning hole is a through hole. The positioning hole is better constructed.
Preferably, the cylindrical structure extends through the locating hole.
Preferably, the diameter of the cylindrical structure is 50% -70% of the diameter of the top surface of the pile body.
Under the condition of guaranteeing the strength of the cylindrical structure, the variable-section pile foundation can better provide vertical load force for the cantilever retaining wall.
Preferably, the bottom of the variable cross-section pile foundation extends into a hard rock-soil layer, the hard rock-soil layer has good bearing capacity, so that the variable cross-section pile foundation has smaller settlement per se, and the vertical uneven settlement of an embankment structure and a soft soil foundation is better controlled.
The invention also discloses a construction method for forming the slope soft soil foundation cantilever retaining wall reinforcing structure, which comprises the following steps:
s1, constructing the pile body, planting connecting steel bars on the top of the pile body before initial setting of concrete of the pile body, and constructing the positioning part by erecting a mold so as to complete foundation construction of the variable cross-section pile;
s2, performing vertical mold pouring on a bottom plate of the cantilever retaining wall, forming a positioning hole in the bottom plate, enabling the positioning part to be in rotating fit with the positioning hole, and then completing construction of the cantilever retaining wall;
and S3, filling the embankment structure.
According to the construction method, due to the fact that the positioning portion on the top of the variable cross-section pile foundation and the bottom plate of the cantilever retaining wall are constructed step by step in a non-connection mode, non-fixed connection (at least mutual rotation matching along one direction) of two structures is achieved; the positioning part at the top of the variable cross-section pile foundation is arranged into a column spherical structure and a cylindrical structure, so that similar hinged fixation between the positioning part and the cantilever retaining wall bottom plate can be realized; meanwhile, the positioning part is connected with the cantilever retaining wall bottom plate in an embedded mode and a penetrating mode, so that the variable-section pile foundation can provide lateral restraint stress for the cantilever retaining wall to resist horizontal soil pressure of the embankment structure on the cantilever retaining wall. The construction method has the characteristics of quick and simple structure construction, easy quality control, environmental protection, contribution to popularization and the like.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the slope soft soil foundation cantilever retaining wall reinforcing structure, the cross-sectional dimension of the positioning part on the variable cross-section pile foundation is smaller than that of the top surface of the pile body, the top surface of the pile body is attached to the bottom surface of the cantilever retaining wall, so that the variable cross-section pile foundation can provide vertical load force for the cantilever retaining wall, the positioning part is in running fit with the positioning hole, the bending moment effect of the cantilever retaining wall on the variable cross-section pile foundation is greatly reduced, and the structural dimension of the variable cross-section pile foundation can be greatly optimized; the variable-section pile foundation and the cantilever retaining wall can be embedded and penetrated to form connection, so that the problem of horizontal deformation control of the slope soft soil foundation is effectively solved; and the cantilever retaining wall structure who sets up has solved embankment structure and soft soil foundation's vertical differential settlement control difficult problem under the effect of variable cross-section stake basis.
2. According to the construction method for forming the slope soft soil foundation cantilever retaining wall reinforcing structure, due to the fact that the positioning portion at the top of the variable cross-section pile foundation and the bottom plate of the cantilever retaining wall are constructed step by step in a non-connection mode, non-fixed connection (at least, the two structures can be in mutual rotation fit along one direction) of the two structures is achieved; the positioning part at the top of the variable cross-section pile foundation is arranged into a column spherical structure and a cylindrical structure, so that similar hinged fixation between the positioning part and the cantilever retaining wall bottom plate can be realized; meanwhile, the positioning part is connected with the cantilever retaining wall bottom plate in an embedded mode and a penetrating mode, so that the variable-section pile foundation can provide lateral restraint stress for the cantilever retaining wall to resist horizontal soil pressure of the embankment structure on the cantilever retaining wall. The construction method has the characteristics of quick and simple structure construction, easy quality control, environmental protection, contribution to popularization and the like.
Drawings
FIG. 1 is a schematic cross-sectional view of a soft soil foundation condition in a slope in the prior art;
FIG. 2 is a schematic cross-sectional view of a slope soft soil foundation cantilever retaining wall reinforcement structure of the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 2 according to the present invention;
FIG. 4 is an enlarged view of the invention at B of FIG. 2;
fig. 5 is a schematic cross-sectional view of the cantilever retaining wall structure of the present invention.
The labels in the figure are: 1-variable cross-section pile foundation, 11-pile body, 12-column spherical structure, 13-cylindrical structure, 2-cantilever retaining wall, 21-cantilever, 22-bottom plate, 23-positioning hole, 3-embankment structure, 4-hard rock-soil layer, 5-soft soil layer and 6-rock-soil boundary line.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the technical solution and advantages of the present invention more apparent, the present invention 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 merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 2-5, the slope soft soil foundation cantilever retaining wall reinforced structure of this embodiment includes:
the variable cross-section pile foundations 1 are arranged in foundation rock-soil bodies at intervals, penetrate through the soft soil layer 5, and enter the hard rock-soil layer 4 at a certain depth from the bottom;
the cantilever retaining wall 2 is arranged on the leveled foundation soil, a bottom plate is fixedly hinged with the variable cross-section column spherical structure 12 and the cylindrical structure 13 at the top of the variable cross-section pile foundation 1, a positioning hole 23 is formed in a bottom plate 22 of the cantilever retaining wall 2, and the column spherical structure 12 and the cylindrical structure 13 are respectively in running fit with the corresponding positioning hole 23;
and the embankment structure 3 is filled on the inner side of the cantilever retaining wall 2 in a layered mode.
The variable cross-section pile foundation 1 is of a reinforced concrete cast-in-situ bored pile structure, the outer variable cross-section pile foundation 1 is arranged below a cantilever 21 of the cantilever retaining wall 2, and the variable cross section at the top of the variable cross-section pile foundation is of a cylindrical spherical structure 12 and is embedded and connected with a bottom plate 22 of the cantilever retaining wall 2; the inside variable cross-section pile foundation 1 is selected and arranged according to the designed width of the bottom plate of the cantilever retaining wall 2, the top variable cross-section of the inside variable cross-section pile foundation is of a cylindrical structure 13, and the top variable cross-section pile foundation penetrates through the bottom plate 22 of the cantilever retaining wall 2 to be connected; the diameter of the column spherical structure 12 and the cylindrical structure 13 is about 50-70% of the diameter of the pile body 11 of the variable cross-section pile foundation 1.
The beneficial effects of this embodiment: the top structure of the variable cross-section pile foundation 1 with the column spherical structure 12 and the cylindrical structure 13 is arranged at the bottom of the cantilever retaining wall 2, so that vertical bearing capacity can be provided for the cantilever retaining wall 2, the cantilever retaining wall 2 is in non-fixed connection with the variable cross-section pile foundation 1, the cantilever retaining wall 2 cannot generate bending moment effect on the variable cross-section pile foundation 1, or the generated bending moment is very small, and the size of the variable cross-section pile foundation 1 can be greatly optimized; the variable-section pile foundation 1 and the cantilever retaining wall 2 are connected in an embedded mode and in a penetrating mode, large horizontal resistance force can be provided for the cantilever retaining wall 2 to balance horizontal soil pressure of the embankment structure 3, and the problem of horizontal deformation control of a slope soft soil foundation is effectively solved; the cantilever retaining wall 2 structure that sets up has solved the vertical differential settlement control difficult problem of embankment structure 3 and soft soil layer 5 under the effect of variable cross section stake basis 1.
Example 2
As shown in fig. 2 to 5, the construction method for forming the slope soft soil foundation cantilever retaining wall reinforcement structure according to embodiment 1 includes the following steps:
A. leveling the field, positioning the plane of the variable cross-section pile foundation 1, and constructing the pile body 11 of the variable cross-section pile foundation 1;
B. before the concrete of the pile body 11 of the variable cross-section pile foundation 1 is initially set, connecting steel bars are planted at the top of the pile body 11, and a column spherical structure 12 and a cylindrical structure 13 of the upper variable cross-section part are constructed in a vertical mold;
C. after the concrete of the variable cross-section pile foundation 1 reaches the design strength, constructing the reinforced concrete of the cantilever retaining wall 2 bottom plate structure by using a vertical mold;
D. before the initial setting of the concrete of the bottom plate structure of the cantilever retaining wall 2, constructing the cantilever reinforced concrete of the cantilever retaining wall 2;
E. and after the concrete of the cantilever retaining wall 2 reaches the design strength, filling the embankment structure 3 in layers.
In the construction method, the positioning part at the top of the variable cross-section pile foundation is constructed, so that the bottom plate of the cantilever retaining wall can be directly vertically cast and automatically connected with the positioning part at the top of the variable cross-section pile foundation, and the bottom plate can be rotatably matched around at least one direction.
The invention has the advantages that the top structure of the variable cross-section pile foundation 1 with the columnar spherical structure 12 and the cylindrical structure 13 is arranged at the bottom of the cantilever retaining wall 2, so that the vertical bearing capacity can be provided for the cantilever retaining wall 2, the cantilever retaining wall 2 and the variable cross-section pile foundation 1 are fixed in a hinged manner, the cantilever retaining wall 2 cannot generate bending moment effect on the variable cross-section pile foundation 1, or the generated bending moment is very small, and the structure size of the variable cross-section pile foundation 1 can be greatly optimized; the variable-section pile foundation 1 and the cantilever retaining wall 2 are connected in an embedded mode and in a penetrating mode, large horizontal resistance force can be provided for the cantilever retaining wall 2 to balance horizontal soil pressure of the embankment structure 3, and the problem of horizontal deformation control of a slope soft soil foundation is effectively solved; the cantilever retaining wall 2 structure that sets up has solved the vertical differential settlement control difficult problem of embankment structure 3 and soft soil layer 5 under the effect of variable cross section stake basis 1. The construction method provided ensures the hinging and fixing functions of the variable-section pile foundation 1 and the cantilever retaining wall 2, and has the characteristics of quick and simple structure construction, easy quality control, environmental protection, contribution to popularization and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a slope soft soil foundation cantilever barricade reinforced structure which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the cantilever retaining wall (2), the bottom surface of the cantilever retaining wall (2) is provided with a positioning hole (23);
the variable cross-section pile foundation (1) is arranged below the cantilever retaining wall (2), the variable cross-section pile foundation (1) comprises a pile body (11), a positioning part is arranged on the top surface of the pile body (11), the positioning part is in running fit with the positioning hole (23), the cross-sectional size of the positioning part is smaller than that of the top surface of the pile body (11), and the top surface of the pile body (11) is attached to the bottom surface of the cantilever retaining wall (2);
and the embankment structure (3) is filled on the inner side of the cantilever retaining wall (2).
2. The slope soft soil foundation cantilever retaining wall reinforced structure of claim 1, characterized in that: cantilever barricade (2) have cantilever (21) and bottom plate (22) that are connected, cantilever (21) set up in bottom plate (22) top, variable cross section stake basis (1) sets up bottom plate (22) below.
3. The slope soft soil foundation cantilever retaining wall reinforced structure of claim 2, characterized in that: the positioning part of the variable-section pile foundation (1) below the cantilever (21) is of a column spherical structure (12), and the column spherical structure (12) is connected with the positioning hole (23) in an embedded mode and can be in running fit with the positioning hole (23).
4. The slope soft soil foundation cantilever retaining wall reinforced structure of claim 3, characterized in that: the diameter of the column spherical structure (12) is 50% -70% of the diameter of the top surface of the pile body (11).
5. The slope soft soil foundation cantilever retaining wall reinforced structure of claim 2, characterized in that: the positioning part of the variable cross-section pile foundation (1) below the embankment structure (3) is a cylindrical structure (13), and the cylindrical structure (13) is in running fit with the corresponding positioning hole (23).
6. The slope soft soil foundation cantilever retaining wall reinforced structure of claim 5, characterized in that: the positioning hole (23) is a through hole.
7. The slope soft soil foundation cantilever retaining wall reinforced structure of claim 6, characterized in that: the cylindrical structure (13) penetrates through the positioning hole (23).
8. The slope soft soil foundation cantilever retaining wall reinforced structure of any one of claims 5-7, wherein: the diameter of the cylindrical structure (13) is 50% -70% of the diameter of the top surface of the pile body (11).
9. The slope soft soil foundation cantilever retaining wall reinforced structure of any one of claims 1-4, wherein: the bottom of the variable cross-section pile foundation (1) extends into the hard rock-soil layer (4).
10. A construction method for forming the slope soft soil foundation cantilever retaining wall reinforcement structure of any one of claims 1 to 9, comprising the steps of:
s1, constructing the pile body (11), planting connecting steel bars at the top of the pile body (11) before initial setting of concrete of the pile body (11), and constructing the positioning part by using a vertical mold so as to finish construction of the variable-section pile foundation (1);
s2, performing vertical mold pouring on a bottom plate (22) of the cantilever retaining wall (2), forming a positioning hole (23) in the bottom plate (22), enabling the positioning part and the positioning hole (23) to be in rotatable fit, and then completing construction of the cantilever retaining wall (2);
and S3, filling the embankment structure (3).
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| CN113668930A (en) * | 2021-08-20 | 2021-11-19 | 成都建筑材料工业设计研究院有限公司 | Bottom plate structure for closed type shed stacking net rack foundation and retaining wall structure |
| CN114482118A (en) * | 2022-01-17 | 2022-05-13 | 兰州铁道设计院有限公司 | Method for realizing width of embankment side by existing-newly built combined cantilever type retaining wall |
| CN114482118B (en) * | 2022-01-17 | 2024-03-26 | 兰州铁道设计院有限公司 | Method for realizing embankment width by existing-newly-built combined cantilever retaining wall |
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