CN111749288B - Load-reducing heightening structure of existing retaining wall and construction method thereof - Google Patents
Load-reducing heightening structure of existing retaining wall and construction method thereof Download PDFInfo
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- CN111749288B CN111749288B CN202010757126.9A CN202010757126A CN111749288B CN 111749288 B CN111749288 B CN 111749288B CN 202010757126 A CN202010757126 A CN 202010757126A CN 111749288 B CN111749288 B CN 111749288B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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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
- E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
- E02D29/0233—Retaining or protecting walls comprising retention means in the backfill the retention means being anchors
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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
- E02D29/0283—Retaining or protecting walls characterised by constructional features of mixed type
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention provides a load-reducing and heightening structure of an existing retaining wall and a construction method thereof, wherein the construction of a hole-leading type prefabricated sheet pile is carried out at a horizontal clear distance which is one third of the height of the back of the existing retaining wall, a foundation trench is dug at the upper part between the existing retaining wall and the prefabricated sheet pile, a reinforcing layer is arranged at the bottom of the foundation trench, a support is hung on the reinforcing layer, a top plate is placed on the support, an extended foundation is additionally arranged on the outer side of the original foundation of the existing retaining wall and is connected through a transverse connecting rib, an extended wall toe is arranged on the outer side of the extended foundation, a ribbed plate is additionally arranged at the upper part, the ribbed plate and the bottom of the existing retaining wall are provided with the transverse connecting rib, the heightened retaining wall is arranged at the top of the existing retaining wall through a vertical connecting rib, an overlength unloading plate is arranged in the middle of the heightened retaining wall, drain holes are sequentially arranged above and below the over, and surface layers are arranged on the water filtering layer and the top of the artificial filling, and the height of the top of the surface layer is consistent with that of the heightened retaining wall.
Description
Technical Field
The invention relates to the field of retaining wall construction, in particular to a load-reducing and heightening structure of an existing retaining wall and a construction method thereof.
Background
The retaining wall is a structure for supporting roadbed filling or hillside soil and preventing the filling or soil from deforming and destabilizing, and is widely applied to buildings, highways, railways, mines, water conservancy and other projects. With the increase of the height of a soil body caused by the progress of soil pushing and filling construction in engineering, the safety and the stability of the existing retaining wall cannot meet the current requirements, and the existing retaining wall is usually required to be dismantled and rebuilt or heightened and reinforced. However, the existing retaining wall dismantling and rebuilding scheme has the problems of large engineering quantity, labor waste and time waste, and meanwhile, in the existing retaining wall dismantling process, the original side slope is easy to be unstable, so that certain danger exists. In addition, there are problems associated with prior art and attempts to provide heightened reinforcement of existing retaining walls: for example, the bearing capacity of the existing retaining wall after being heightened and reinforced is limited, so that the pressure of a soil body is large; the effect of tradition unloading board is poor, causes original basis to subside too big, brings the potential safety hazard.
Therefore, it is very important to find a load-reducing and heightening structure of the existing retaining wall with high construction efficiency, good bearing capacity, high safety and stability and a construction method thereof.
Disclosure of Invention
The invention aims to provide a load-reducing and heightening structure of an existing retaining wall and a construction method thereof, wherein the structure is high in construction efficiency, good in bearing capacity, high in safety and stability.
In order to achieve the above purpose, the technical scheme provides a construction method of a load-reducing and heightening structure of an existing retaining wall, which comprises the following steps:
1) firstly, manufacturing a prefabricated sheet pile in a prefabrication factory, measuring and setting off according to the position of an existing retaining wall, determining the position of the prefabricated sheet pile, and then driving and constructing a hole-leading type prefabricated sheet pile in an existing soil filling area by adopting a static pressure pile driver;
2) excavating a foundation trench in the upper range between the existing retaining wall and the precast sheet pile, wherein the width of the foundation trench is the same as the depth of the foundation trench, so that the construction operation of an anchor rod and a water drainage hole at the foundation trench is facilitated;
3) an anchor rod penetrates through an anchor rod guide hole in the precast sheet pile in the foundation trench, the anchor rod is obliquely inserted and driven into a mountain, and a row of PVC pipe drain holes are obliquely and downwards arranged at intervals at the bottom of the foundation trench at the existing retaining wall according to a certain slope ratio;
4) the method comprises the following steps of manufacturing a top plate and a support in advance in a prefabrication factory, wherein the top plate is made of a reinforced concrete precast slab, the support is made of angle steel through welding, performing anticorrosion and antirust treatment, arranging a reinforcing layer at the bottom of a foundation pit, hoisting an installation support into the foundation pit, and then placing and fixing the top plate on the support;
5) drilling holes on the outer side of the original foundation and the bottom of the existing retaining wall to form transverse connecting ribs, then binding and lapping reinforcing steel bars of the expanded foundation, the extension wall toe and the rib plate, and carrying out concrete pouring construction on the expanded foundation, the extension wall toe and the rib plate by adopting concrete of the same level as the original foundation;
6) drilling vertical connecting ribs at the top of the existing retaining wall, binding and overlapping the reinforcing steel bars of the heightened retaining wall, reserving PVC drain holes and overlapped reserved reinforcing steel bars of the overlong unloading plate at corresponding positions, and then adopting concrete of the same level as the existing retaining wall to carry out concrete pouring construction of the heightened retaining wall at the top of the existing retaining wall;
7) arranging and installing dowel bars at certain intervals at the top of the precast sheet pile, binding and forming, and carrying out cast-in-place construction on the support columns, wherein the height of each support column extends to a position which is one-half of the height of the heightened retaining wall;
8) lapping and binding steel bars of the overlong unloading plate in the middle of the heightened retaining wall and at the top of the strut, and then erecting a template to perform concrete pouring construction of the overlong unloading plate, wherein the length of the overlong unloading plate is 1.5 times of the horizontal distance from the strut to the heightened retaining wall;
9) and (3) setting a water filtering layer by adopting graded sand stones within the length range of two thirds of the super-long unloading plate behind the heightened retaining wall, carrying out layered artificial filling and compaction on other areas, and finally constructing a surface layer to finish the construction operation of the load-reducing heightened structure of the existing retaining wall.
A load-reducing reinforced structure of an existing wall body is obtained by construction according to a construction method on the load-reducing reinforced structure.
Compared with the prior art, the technical scheme has the following characteristics and beneficial effects:
1. the invention reduces the lateral soil pressure of the existing retaining wall through the arrangement of the foundation trench, the prefabricated sheet pile and the anchor rod, and the lateral soil pressure of the heightened artificial filling is mainly born by the prefabricated sheet pile and the anchor rod, thereby avoiding the excessive lateral soil pressure generated by the existing retaining wall.
2. According to the invention, through expanding the foundation, extending the wall toe and arranging the rib plates, the vertical bearing capacity of the existing retaining wall is increased, the reserved bearing capacity is provided for the arrangement of the heightened retaining wall, and the settlement of the original foundation is reduced.
3. The invention improves the unloading effect of the traditional unloading plate by arranging the overlong unloading plate, and simultaneously enhances the horizontal bearing capacity of the heightened retaining wall to a certain extent by the combined design of the overlong unloading plate and the pillar, and increases the safety factor of the heightened retaining wall.
Drawings
FIG. 1 is a schematic view of a load-relieving elevated structure of an existing retaining wall;
FIG. 2 is a schematic view showing the arrangement of precast slab piles;
FIG. 3 is a schematic view of the arrangement of the base groove;
FIG. 4 is a schematic view of the arrangement of the anchor rods and the base channel weep holes;
FIG. 5 is a schematic view of the arrangement of the top plate;
FIG. 6 is a schematic layout of a development base;
FIG. 7 is a schematic view of the raised retaining wall arrangement;
FIG. 8 is a schematic view of the arrangement of the struts;
fig. 9 is a schematic view of the layout of an ultra-long unloading plate.
Wherein: 1-heightening the retaining wall; 2-vertical connecting ribs; 3-water drainage hole; 4-existing retaining wall; 5-a rib plate; 6-expanding the foundation; 7-extending wall toe; 8-transverse connecting ribs; 9-original basis; 10-water filtration layer; 11-facing; 12-super long unloading plate; 13-a pillar; 14-a top plate; 15-base groove; 16-a support; 17-a reinforcement layer; 18-precast sheet piles; 19-existing fill; 20-anchor rod; 21-artificial filling; 22-mountain; 23-inserting ribs; 24-anchor rod leading hole; and 25, reserving reinforcing steel bars.
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 that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
The scheme provides a construction structure of a load-reducing and heightening structure of an existing retaining wall, which is used for processing the load-reducing and heightening structure on the existing retaining wall (4), wherein the existing retaining wall (4) is arranged at the side of an existing soil filling (19) at the side of a mountain body (22), the existing retaining wall (4) is arranged on an original foundation (9), and the construction structure of the load-reducing and heightening structure is composed of a heightened retaining wall (1), vertical connecting ribs (2), water drainage holes (3), rib plates (5), an expanded foundation (6), transverse connecting ribs (8), a water filtering layer (10), a surface layer (11), an overlong unloading plate (12), a support pillar (13), a top plate (14), a foundation trench (15), a support (16), a reinforcing layer (17), a precast sheet pile (18), an anchor rod (20) and an artificial soil filling (21).
The prefabricated sheet pile (18) is arranged at a horizontal clear distance which is one third of the height of the back of the existing retaining wall (4) and is driven into the existing filling soil (19), the bottom of the prefabricated sheet pile (18) and the bottom of the original foundation (9) are positioned on the same horizontal plane, the top of the prefabricated sheet pile (18) and the top of the existing retaining wall (4) are positioned on the same horizontal plane, and the top of the prefabricated sheet pile (18) is provided with inserting ribs (23) at intervals, so that the construction and the manufacture of the support column (13) are facilitated; the side surface of the precast sheet pile (18) is provided with an anchor rod lead hole (24), wherein the distance between the anchor rod lead hole (24) and the top of the precast sheet pile (18) is about one sixth of the height of the existing retaining wall (4), and the position of the precast sheet pile (18) close to at least one anchor rod lead hole (24) on the existing retaining wall (4) side is higher than the position of the precast sheet pile (18) far away from at least one anchor rod lead hole (24) on the existing retaining wall (4) side.
The foundation trench (15) is arranged at the upper space position of the existing filling (19) between the existing retaining wall (4) and the precast sheet pile (18), the width of the foundation trench (15) is the same as the depth of the foundation trench (15), the height of the foundation trench (15) is one third of the height of the existing retaining wall (4), namely, the foundation trench (15) is arranged at the upper one third of the height between the existing retaining wall (4) and the precast sheet pile (18) and is used for construction operation of the anchor rod (20) and the foundation trench drainage hole (3).
The anchor rods (20) penetrate through anchor rod guide holes (24) in the precast sheet piles (18), are obliquely inserted through existing filling soil (19) and are arranged in the mountain bodies (22), and the positions, close to the bottoms of the foundation ditches (15), of the existing retaining walls (4) are obliquely downward according to a certain slope ratio and are arranged at intervals in a row to obtain water drainage holes (3) by utilizing PVC pipes.
The bottom side of the foundation trench (15) is provided with a reinforcing layer (17), the reinforcing layer (17) is provided with a support (16) in a hanging mode, and the top plate (14) is placed on the support (16).
The expansion foundation (6) is arranged on the outer side of an original foundation (9) of the existing retaining wall (4), the expansion foundation (6) is connected with the original foundation (9) through a transverse connecting rib (8), and the top of the expansion foundation (6) and the top of the original foundation (9) are located on the same horizontal plane.
An extension wall toe (7) is arranged on the outer side of the expansion foundation (6), and the extension wall toe (7) is arranged on the side of the bottom of the expansion foundation (6), so that the horizontal sliding resistance of the expansion foundation (6) is enhanced conveniently.
Rib plates (5) are additionally arranged on the upper portions of the expanding foundations (6), so that upper stress can be conveniently diffused to the expanding foundations (6), and transverse connecting ribs (8) are arranged at the bottom portions of the rib plates (5) and the existing retaining wall (4).
The heightened retaining wall (1) is arranged at the top of the existing retaining wall (4) through vertical connecting ribs (2), an overlong unloading plate (12) is arranged in the middle of the back side of the heightened retaining wall (1), the lower part of the overlong unloading plate (12) is a strut (13), the lower part of the strut (13) is a precast sheet pile (18), and the strut (13) is obtained by construction on a dowel (23). The distance between the support columns (13) and the heightened retaining wall (1) is two thirds of the length of the overlong unloading plate (12), and water drain holes (3) are sequentially arranged above and below the overlong unloading plate (12) of the heightened retaining wall (1).
The water filtering layer (10) is arranged in the length range of two-thirds of the length of the super-long unloading plate (12) at the back of the heightened retaining wall (1), the artificial filling soil (21) is compacted and backfilled at the back side of the water filtering layer (10), the top parts of the water filtering layer (10) and the artificial filling soil (21) are provided with the surface layer (11), and the top part of the surface layer (11) and the top part of the heightened retaining wall (1) are positioned on the same horizontal plane.
In other words, the water filtering layer (10) is arranged on the back side of the heightened retaining wall (1) and on the upper side of the overlong unloading plate (12), wherein the water filtering layer (10) is arranged in the length range of two thirds of the overlong unloading plate (12) at the back, and the water filtering layer (10) adopts graded sandstone.
The scheme provides a construction method of a load-reducing and heightening structure of an existing retaining wall, the load-reducing and heightening structure is processed on the existing retaining wall (4), wherein the existing retaining wall (4) is arranged on the side of an existing soil filling (19) on the side of a mountain body (22), the existing retaining wall (4) is arranged on an original foundation (9), and the construction method comprises the following steps:
1) as shown in fig. 2, firstly, a precast sheet pile (18) is manufactured in a prefabrication factory, then measurement and setting-out are carried out according to the position of the existing retaining wall (4), the position of the precast sheet pile (18) is determined, and then a static pressure pile machine is adopted to carry out driving construction on the precast sheet pile (18) in the area filled with soil (19);
wherein precast sheet pile (18) set up in the clear distance department of the level apart from existing barricade (4) back third height, promptly, the interval of precast sheet pile (18) and existing barricade (4) is 1/3 of existing barricade (4) height, and the position control is established in beating of precast sheet pile (18): the bottom of the prefabricated sheet pile (18) and the original foundation (9) are located on the same horizontal plane, the top of the prefabricated sheet pile (18) and the top of the existing retaining wall (4) are located on the same horizontal plane, anchor rod guide holes (24) are formed in two side faces of the prefabricated sheet pile (18), the distance between each anchor rod guide hole (24) and the top of the corresponding prefabricated sheet pile (18) is about one sixth of the height of the existing retaining wall (4), and the position, close to at least one anchor rod guide hole (24) on the existing retaining wall (4) side, of the prefabricated sheet pile (18) is higher than the position, far away from at least one anchor rod guide hole (24) on the existing retaining wall (4) side, of the prefabricated sheet pile (18).
2) As shown in fig. 3, a foundation trench (15) is excavated in an upper spatial position of the existing fill (19) between the existing retaining wall (4) and the precast sheet pile (18), and the width of the foundation trench (15) is the same as the depth of the foundation trench (15), wherein the height of the foundation trench (15) is one third of the height of the existing retaining wall (4), i.e., the foundation trench (15) is disposed at the upper one third of the height between the existing retaining wall (4) and the precast sheet pile (18).
3) As shown in fig. 4, an anchor rod (20) penetrates through an anchor rod guide hole (24) on a precast sheet pile (18) in a foundation trench (15) so that the anchor rod (20) is obliquely inserted through existing filling soil (19) and is driven into a mountain body (22), a row of drainage holes (3) obtained by utilizing PVC pipes are obliquely arranged downwards at a certain slope ratio at a position of an existing retaining wall (4) close to the bottom of the foundation trench (15), wherein the inclination direction of the PVC pipe drainage holes (3) is the same as that of the mountain body (22).
4) As shown in fig. 5, a top plate (14) and a support (16) are manufactured in advance in a prefabrication plant, a reinforcing layer (17) is arranged on the bottom side of a foundation trench (15), then an installation support (16) is hung in the foundation trench (15), and then the top plate (14) is placed and fixed on the support (16), wherein the top plate (14) is made of a reinforced concrete prefabricated plate, the support (16) is made of angle steel through welding, and anti-corrosion and anti-rust treatment is performed, wherein a drain hole (3) is arranged above the reinforcing layer (17);
5) as shown in fig. 6, holes are drilled on the outer side of the original foundation (9) and the bottom of the existing retaining wall (4), transverse connecting ribs (8) are arranged, then, the expanded foundation (6), the extension wall toe (7) and the rib plate (5) are bound and overlapped by reinforcing steel bars, and concrete of the same level as the original foundation (9) is adopted for concrete pouring construction of the expanded foundation (6), the extension wall toe (7) and the rib plate (5);
wherein the expansion foundation (6) is arranged on the outer side of the original foundation (9) of the existing retaining wall (4), the expansion foundation (6) is connected with the original foundation (9) through a transverse connecting rib (8), and the top of the expansion foundation (6) and the top of the original foundation (9) are positioned on the same horizontal plane.
Wherein the outer side of the expansion foundation (6) is provided with an extension wall toe (7), and the extension wall toe (7) is arranged at the side of the bottom of the expansion foundation (6), so that the horizontal sliding resistance of the expansion foundation (6) is enhanced.
Wherein rib plate (5) are arranged on expanding foundation (6) and lean on the bottom of existing barricade (4), and rib plate (5) and existing barricade (4) bottom are equipped with transverse connection muscle (8), the better diffusion of upper portion stress of being convenient for is to expanding on foundation (6).
6) As shown in fig. 7, a vertical connecting rib (2) is drilled at the top of the existing retaining wall (4), then the reinforcing steel bars of the heightened retaining wall (1) are bound and overlapped, a PVC drain hole (3) and a reserved reinforcing steel bar (25) are reserved at the corresponding position of the heightened retaining wall (1), and then concrete pouring construction of the heightened retaining wall (1) is carried out at the top of the existing retaining wall (4) by adopting concrete of the same level as that of the existing retaining wall (4);
the PVC drainage holes (3) are inclined downwards according to a certain slope ratio and are inclined in the same direction with the PVC drainage holes (3) in the existing retaining wall (4), the reserved steel bars (25) are embedded in one side, close to the existing filling soil (19), of the reinforced retaining wall (1), and preferably, the reserved steel bars (25) are embedded in the middle of the reinforced retaining wall (1).
7) As shown in fig. 8, the top of the precast sheet pile (18) is provided with the installation dowel bars (23) at certain intervals and is bound and formed, and the cast-in-situ construction of the support columns (13) is carried out on the dowel bars (23), wherein the height of the support columns (13) is half of the height of the heightened retaining wall (1);
8) as shown in fig. 9, the steel bars of the overlong unloading plate (12) are lapped and bound at the middle part of the heightened retaining wall (1) and the top of the support column (13), and then a template is erected for concrete pouring construction of the overlong unloading plate (12), wherein the length of the overlong unloading plate (12) is 1.5 times of the horizontal distance from the support column (13) to the heightened retaining wall (1);
9) as shown in figure 1, a water filtering layer (10) is arranged between a heightened retaining wall (1) and a support column (13), the water filtering layer (10) is arranged on the back side of the heightened retaining wall (1) and on the upper side of an ultralong unloading plate (12), wherein the water filtering layer (10) is arranged in the length range of two thirds of the ultralong unloading plate (12) behind, the water filtering layer (10) adopts graded sandstone, the other areas between the back side of the heightened retaining wall (1) and a mountain body (22) are subjected to layered artificial filling (21) and compaction, finally, a surface layer (11) is obtained by construction on the artificial filling (21) and the water filtering layer (10), wherein the top of the surface layer (11) and the top of the strengthened wall body (1) are positioned on the same horizontal plane, and the construction operation of the load-reducing heightened structure of the existing retaining wall is.
In addition, the scheme provides a load-reducing and heightening structure of the existing retaining wall obtained according to the construction method.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (9)
1. A construction method for a load-reducing and heightening structure of an existing retaining wall is characterized by comprising the following steps:
step 1), prefabricating a precast sheet pile (18), determining the position of the precast sheet pile (18) according to the position of an existing retaining wall (4), and driving and constructing the precast sheet pile (18) in an existing soil filling (19) area, wherein the driving and constructing position of the precast sheet pile (18) is controlled to be: the bottom of the prefabricated sheet pile (18) and the original foundation (9) are located on the same horizontal plane, the top of the prefabricated sheet pile (18) and the top of the existing retaining wall (4) are located on the same horizontal plane, and anchor rod guide holes (24) are formed in two side faces of the prefabricated sheet pile (18);
step 2) excavating a foundation trench (15) in the upper space position of the existing filling (19) between the existing retaining wall (4) and the precast sheet pile (18);
step 3), an anchor rod (20) penetrates through an anchor rod guide hole (24) in the precast sheet pile (18) in the foundation trench (15) so that the anchor rod (20) is obliquely inserted through the existing filling soil (19) and is arranged in a mountain body (22), and a row of drain holes (3) are obliquely arranged downwards at the position, close to the bottom of the foundation trench (15), of the existing retaining wall (4) at intervals according to a certain slope ratio;
step 4), prefabricating a top plate (14) and a support (16), arranging a reinforcing layer (17) on the bottom side of a base groove (15), then hoisting the mounting support (16) into the base groove (15), and then placing and fixing the top plate (14) on the support (16);
step 5), drilling holes in the outer side of an original foundation (9) and the bottom of an existing retaining wall (4) and arranging transverse connecting ribs (8), carrying out concrete pouring construction on an expanded foundation (6), an extension wall toe (7) and a rib plate (5), wherein the expanded foundation (6) is arranged on the outer side of the original foundation (9) of the existing retaining wall (4), the extension wall toe (7) is arranged on the outer side of the expanded foundation (6), and the rib plate (5) is arranged on the expanded foundation (6) and abuts against the bottom of the existing retaining wall (4);
step 6), drilling vertical connecting ribs (2) at the top of the existing retaining wall (4), binding and overlapping the reinforcing steel bars of the heightened retaining wall (1), and performing concrete pouring construction of the heightened retaining wall (1);
step 7), arranging and installing dowel bars (23) at intervals on the top of the precast sheet pile (18), binding and forming, and performing cast-in-situ construction on the support columns (13) on the dowel bars (23);
step 8) carrying out concrete pouring construction of the overlong unloading plate (12) on the middle part of the heightened retaining wall (1) and the top of the strut (13);
and 9) arranging a water filtering layer (10) between the heightened retaining wall (1) and the support column (13), arranging the water filtering layer (10) on the back side of the heightened retaining wall (1) and the upper side of the overlong unloading plate (12), performing layered artificial filling (21) and compaction on the other areas between the back side of the heightened retaining wall (1) and the mountain body (22), and finally performing construction on the artificial filling (21) and the water filtering layer (10) to obtain a surface layer (11).
2. The construction method of a load-reducing heightened structure of an existing retaining wall according to claim 1, wherein the precast sheet pile (18) is disposed at a horizontal clear distance from the back of the existing retaining wall (4) by a height of one third, and the anchor rod introduction hole (24) is spaced from the top of the precast sheet pile (18) by a distance of one sixth of the height of the existing retaining wall (4).
3. The construction method of a load-reducing heightened structure of an existing retaining wall according to claim 1, wherein the width of the foundation trench (15) is the same as the depth of the foundation trench (15), wherein the height of the foundation trench (15) is one third of the height of the existing retaining wall (4).
4. The construction method of a load-reducing and heightening structure of an existing retaining wall according to claim 1, wherein the top plate (14) is made of a reinforced concrete precast slab, and the bracket (16) is made of angle steel by welding.
5. The construction method of a load-shedding and heightening structure of an existing retaining wall according to claim 1, wherein in step 5), the reinforcement binding and overlapping of the extended foundation (6), the extended toe (7) and the rib plate (5) are performed, and concrete pouring construction of the extended foundation (6), the extended toe (7) and the rib plate (5) is performed by using concrete of the same grade as the original foundation (9).
6. The construction method of a load-reducing and heightening structure of an existing retaining wall according to claim 1, wherein the top of the extended foundation (6) and the top of the original foundation (9) are located at the same horizontal plane, the extended toe (7) is disposed at the side of the bottom of the extended foundation (6), and the rib plate (5) and the bottom of the existing retaining wall (4) are provided with the transverse connecting rib (8).
7. The construction method of a load-shedding heightened structure of an existing retaining wall according to claim 1, wherein in step 6), reinforcement binding and overlapping of the heightened retaining wall (1) are performed, PVC drainage holes (3) and reserved reinforcements (25) are reserved at corresponding positions of the heightened retaining wall (1), and then concrete casting construction of the heightened retaining wall (1) is performed at the top of the existing retaining wall (4) using concrete of the same grade as that of the existing retaining wall (4).
8. The construction method of a load-reducing heightened structure of an existing retaining wall according to claim 1, wherein the height of the pillars (13) is one-half of the height of the heightened retaining wall (1).
9. A load-reducing heightening structure of an existing retaining wall, characterized in that it is constructed by the construction method of the load-reducing heightening structure of the existing retaining wall according to any one of claims 1 to 8 thereon.
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| CN113481774B (en) * | 2021-06-21 | 2022-05-27 | 浙大城市学院 | Construction method of light embankment structure on steep mountain land |
| CN113863485B (en) * | 2021-10-26 | 2022-11-22 | 广州市天作建筑规划设计有限公司 | Connecting plate structure between building and soil retaining structure and construction method thereof |
| CN114658045B (en) * | 2022-04-15 | 2024-03-01 | 福州市勘测院有限公司 | Active retaining wall repairing construction method |
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| JP6207949B2 (en) * | 2013-09-25 | 2017-10-04 | 鹿島建設株式会社 | Retaining wall structure |
| CN104195911B (en) * | 2014-08-26 | 2016-06-08 | 德州市公路工程总公司 | The one section Widening Embankment structure of suspended wall height barricade embankment near water and construction method |
| CN205804402U (en) * | 2016-07-06 | 2016-12-14 | 中国电建集团贵阳勘测设计研究院有限公司 | Retaining wall reinforced structure |
| CN108086352A (en) * | 2018-02-01 | 2018-05-29 | 云南新创新交通建设股份有限公司 | A kind of highway hard rock Steep Slope Embankment anchor rod foundation Anti-slide Pile Retaining Structure |
| CN108661069A (en) * | 2018-04-02 | 2018-10-16 | 山东建筑大学 | Close on the wall piled anchor composite structure and method of old Retaining Wall Reinforcement under the load of river road surface |
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| CN111058475A (en) * | 2019-12-29 | 2020-04-24 | 中铁二院工程集团有限责任公司 | High-intensity seismic area pile foundation joist constant-weight retaining wall structure and construction method |
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