CN112323776A - Open-cut tunnel precast pile and precast lining superimposed structure and construction method thereof - Google Patents
Open-cut tunnel precast pile and precast lining superimposed structure and construction method thereof Download PDFInfo
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- CN112323776A CN112323776A CN202011486475.8A CN202011486475A CN112323776A CN 112323776 A CN112323776 A CN 112323776A CN 202011486475 A CN202011486475 A CN 202011486475A CN 112323776 A CN112323776 A CN 112323776A
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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
- E02D5/24—Prefabricated piles
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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
- E02D17/02—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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
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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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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention belongs to the technical field of underground structure engineering, and particularly relates to an open cut tunnel precast pile and precast lining superposed structure and a construction method thereof, wherein the open cut tunnel precast pile and precast lining superposed structure comprises a precast lining, a precast pile and a crown beam; the prefabricated lining comprises a prefabricated lining top plate, a prefabricated lining bottom plate and a prefabricated lining side wall; the top of the precast pile is provided with a crown beam, and a crown beam reinforcement cage is arranged in the crown beam; a prefabricated lining top plate stress main rib is arranged in the prefabricated lining top plate, the prefabricated lining top plate stress main rib is connected with a crown beam reinforcement cage, and concrete is poured between the prefabricated lining top plate and the crown beam to form a top superposed region; be equipped with precast pile atress owner muscle in the precast pile, be equipped with precast lining cutting side wall atress owner muscle in the precast lining cutting side wall, the bottom and the precast pile atress owner muscle of precast lining cutting side wall atress owner muscle are connected, and pour the concrete between the bottom of precast lining cutting side wall and the precast pile, form the bottom coincide region. The invention can greatly save construction materials, reduce the influence on the surrounding environment and the construction risk and save the construction period.
Description
Technical Field
The invention belongs to the technical field of underground structural engineering, and particularly relates to an open cut tunnel precast pile and precast lining superposed structure and a construction method thereof.
Background
At present, the application of prefabricated structures is more and more extensive in the field of open cut underground engineering. In open cut underground engineering China, enclosure engineering around foundation pits is indispensable, and more underground engineering adopts precast piles to enclose the foundation pits. Compared with the common cast-in-place pile, the precast pile has the advantages of low production cost, small reinforcement ratio, steel saving, large single concrete bearing capacity, simple and convenient construction, low technical difficulty and the like.
In the field of current foundation pit enclosure, especially in the field of open cut tunnel engineering, the precast pile is only used as a temporary enclosure structure and is abandoned after the tunnel engineering construction is finished. The result of this is on one hand the waste of construction materials and on the other hand the great influence on the surrounding formation environment. Therefore, in order to fully utilize the guard piles and save construction materials, the open-cut tunnel enclosure structure and the lining side wall need to be overlapped, and the guard piles and the lining side wall can bear the pressure of surrounding water and soil at the later stage. At present, only a few engineering cases exist in the aspects of pile prefabrication and lining side wall cast-in-place for pile wall superposition, and no actual engineering case exists for the superposition of both fender piles and lining between prefabrication, so that the problems of prefabricated pile abandonment, excessive lining side wall thickness and the like still exist in actual engineering.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the superposed structure of the open-cut tunnel precast pile and the precast lining and the construction method thereof, which can greatly save construction materials, reduce the influence on the surrounding environment of the foundation pit, reduce the construction risk and save the construction period.
In order to achieve the purpose, the technical scheme of the invention is a superposed structure of a precast pile and a precast lining of an open-cut tunnel, which comprises the precast lining, the precast pile and a crown beam; the prefabricated lining comprises a prefabricated lining top plate, a prefabricated lining bottom plate and a prefabricated lining side wall; the top of the precast pile is provided with a crown beam, and a crown beam reinforcement cage is arranged in the crown beam; a prefabricated lining top plate stressed main rib is arranged in the prefabricated lining top plate, the prefabricated lining top plate stressed main rib is connected with the crown beam reinforcement cage, and concrete is poured between the prefabricated lining top plate and the crown beam to form a top superposed region; the prefabricated lining side wall is characterized in that prefabricated pile stressed main ribs are arranged in the prefabricated pile, prefabricated lining side wall stressed main ribs are arranged in the prefabricated lining side walls, the bottom of the prefabricated lining side wall stressed main ribs is connected with the prefabricated pile stressed main ribs, concrete is poured between the bottom of the prefabricated lining side walls and the prefabricated pile, and a bottom superposed region is formed.
Furthermore, a first hole groove is reserved on the crown beam, the part of the crown beam reinforcement cage is exposed in the first hole groove, and the prefabricated lining top plate stressed main reinforcement is connected with the crown beam reinforcement cage exposed in the first hole groove through a connecting reinforcement; concrete is poured in the first hole groove and between the prefabricated lining top plate and the crown beam.
Further, the first hole grooves correspond to the precast piles one by one, and the first hole grooves are arranged at the positions, close to the precast lining top plate, of the tops of the crown beams.
Furthermore, the end part of the stressed main rib of the prefabricated lining top plate is connected with a reinforcing steel bar connector, and the connecting reinforcing steel bar is connected with the reinforcing steel bar connector.
Furthermore, a second hole groove is reserved at the bottom of the prefabricated lining side wall, and the bottom of the stressed main rib of the prefabricated lining side wall is exposed in the second hole groove; a third hole groove is reserved on the precast pile corresponding to the second hole groove, and the stressed main rib part of the precast pile is exposed in the third hole groove; the precast pile stressed main reinforcement exposed in the third hole groove is connected with the precast lining side wall stressed main reinforcement in the second hole groove; concrete is poured in the second hole groove, the third hole groove and between the second hole groove and the third hole groove.
Furthermore, the precast pile stressed main reinforcement is connected with the precast lining side wall stressed main reinforcement through spiral steel bars.
Furthermore, the second hole groove is formed in the position, corresponding to the prefabricated lining bottom plate, of the outer side of the bottom of the prefabricated lining side wall.
Furthermore, a fourth hole groove is formed in a position, corresponding to the second hole groove, in a soil layer between the precast pile and the precast pile, and concrete is poured in the fourth hole groove and between the fourth hole groove and the second hole groove.
Furthermore, concrete is poured between the part, located above the bottom overlapping area, of the precast pile and the precast lining side wall.
The invention also provides a construction method of the superposed structure of the open-cut tunnel precast pile and the precast lining, which comprises the following steps:
1) prefabricating the precast pile in a factory, reserving a third hole groove to expose the force-bearing main rib of the precast pile, and transporting to a construction site to perform pile sinking construction of the precast pile;
2) after the precast pile is completely constructed, constructing a crown beam, and reserving a first hole groove to expose a crown beam reinforcement cage when the crown beam is cast;
3) after the construction of the top beam is finished, excavating a foundation pit; excavating a fourth hole groove in a soil layer between the precast piles corresponding to the third hole groove during excavation of the foundation pit;
4) prefabricating a prefabricated lining in a factory, reserving a second hole groove at the bottom of the prefabricated lining side wall to expose a stressed main rib of the prefabricated lining side wall, transporting to a construction site for installation and splicing, and enabling the prefabricated lining to correspond to the superposed position of a prefabricated pile;
5) after the prefabricated lining is installed, adopting spiral steel bars to rotate and longitudinally install at the bottom superposition position, and connecting the prefabricated pile stressed main rib exposed in the third hole groove with the prefabricated lining side wall stressed main rib in the second hole groove; connecting a reinforcing steel bar connector at the end part of a stressed main reinforcing steel bar of the prefabricated lining top plate in the prefabricated lining top plate with a crown beam reinforcing cage exposed in the first hole groove by adopting a connecting reinforcing steel bar at the top superposition position;
6) and after the connection of the bottom and top reinforcing steel bars is finished, concrete is poured between the second hole groove, the third hole groove, the fourth empty groove and the second hole groove and between the third hole groove and the fourth empty groove to form a bottom superposed region, then concrete is poured between the part of the precast pile above the bottom superposed region and the precast lining side wall, and finally concrete is poured between the first hole groove and the precast lining top plate and the crown beam to form a top superposed region.
Compared with the prior art, the invention has the following beneficial effects:
compared with the existing open-cut tunnel guard post and lining side wall which are not superposed and the precast post and the side wall with a cast-in-place structure which are superposed, the construction method has the advantages that the precast post and the precast lining side wall are superposed, so that the construction material can be greatly saved, the thickness of the precast lining side wall is reduced, the supporting effect of the precast post is fully utilized, the influence on the surrounding environment of the foundation pit is reduced, the bending moment borne by the precast lining side wall is reduced, the construction risk is reduced, the purposes of simple, convenient and quick construction and saving the whole construction period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a superposed structure of an open-cut tunnel precast pile and a precast lining provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a top overlapping region of an overlapping structure of an open-cut tunnel precast pile and a precast lining provided by an embodiment of the invention;
fig. 3 is a schematic view of a bottom overlapping region of an overlapping structure of an open-cut tunnel precast pile and a precast lining provided by an embodiment of the present invention;
in the figure: 1. a crown beam; 2. a top superimposed region; 3. prefabricating a lining; 31. prefabricating a lining top plate; 32. prefabricating a lining bottom plate; 33. prefabricating a lining side wall; 4. a steel bar connector; 5. connecting reinforcing steel bars; 6. a crown beam reinforcement cage; 7. prefabricating a lining top plate stressed main rib; 8. lightweight foam concrete; 9. prefabricating a pile; 10. prefabricating a stressed main rib of the lining side wall; 11. spiral reinforcing steel bars; 12. the prefabricated pile is stressed with main reinforcements; 13. a bottom laminating area.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1-3, the present embodiment provides a superposed structure of a precast pile and a precast lining of an open-cut tunnel, which includes a precast lining 3, a precast pile 9 and a crown beam 1; the prefabricated lining 3 comprises a prefabricated lining top plate 31, a prefabricated lining bottom plate 32 and a prefabricated lining side wall 33; the top of the precast pile 9 is provided with a crown beam 1, and a crown beam reinforcement cage 6 is arranged in the crown beam 1; a prefabricated lining top plate stressed main rib 7 is arranged in the prefabricated lining top plate 31, the prefabricated lining top plate stressed main rib 7 is connected with the crown beam reinforcement cage 6, and concrete is poured between the prefabricated lining top plate 31 and the crown beam 1 to form a top superposed region 2; be equipped with precast pile atress owner muscle 12 in the precast pile 9, be equipped with precast lining side wall atress owner muscle 10 in the precast lining side wall 33, the bottom of precast lining side wall atress owner muscle 10 with precast pile atress owner muscle 12 is connected, just the bottom of precast lining side wall 33 with concrete has been pour between the precast pile 9, forms bottom coincide region 13. According to the embodiment, the top superposed region 2 is formed between the prefabricated lining top plate 31 of the prefabricated lining 3 and the crown beam 1, and the bottom superposed region 13 is formed between the prefabricated lining side wall 33 of the prefabricated lining 3 and the prefabricated pile 9, the supporting effect of the prefabricated pile 9 is fully utilized, the thickness of the prefabricated lining side wall 33 is reduced, construction materials are greatly saved, meanwhile, the influence on the surrounding environment of a foundation pit is reduced, the bending moment borne by the prefabricated lining side wall 33 is reduced, the construction risk is reduced, the construction is simple, convenient and quick, and the whole construction period is shortened.
Furthermore, a first hole groove is reserved on the crown beam 1, part of the crown beam reinforcement cage 6 is exposed in the first hole groove, and the prefabricated lining top plate stress main reinforcement 7 is connected with the crown beam reinforcement cage 6 exposed in the first hole groove through a connecting reinforcement 5; concrete is poured in the first hole groove and between the prefabricated lining top plate 31 and the crown beam 1. In the embodiment, a first hole groove is reserved on the crown beam 1 when the crown beam 1 is poured, concrete pouring is not carried out, and the part of the crown beam reinforcement cage 6 is exposed in the first hole groove so as to be connected with the prefabricated lining top plate stressed main rib 7 of the prefabricated lining 3 in the later period, so that the strength of the top superposed region 2 and the integrity of the prefabricated lining 3 and the precast pile 9 are improved.
Further, the first holes and grooves are corresponding to the precast piles 9 one by one, and are arranged at the top of the crown beam 1 near the precast lining roof 31. As shown in fig. 1 and fig. 2, in this embodiment, a first hole groove is reserved on the crown beam 1 at a position corresponding to each precast pile 9, and the first hole groove is disposed at an upper portion of the crown beam 1, and a cross-sectional dimension of the first hole groove is smaller than a cross-sectional dimension of the precast pile 9.
Furthermore, the end of the stressed main reinforcement 7 of the prefabricated lining top plate is connected with a reinforcement connector 4, and the connecting reinforcement 5 is connected with the reinforcement connector 4. In this embodiment, when the prefabricated lining 3 is prefabricated, the end of the stressed main reinforcement 7 of the prefabricated lining top plate in the prefabricated lining top plate 31 is connected with a reinforcement connector 4, so as to be connected with the crown beam reinforcement cage 6 exposed in the first hole groove in the later period.
Further, a second hole groove is reserved at the bottom of the prefabricated lining side wall 33, and the bottom of the stressed main rib 10 of the prefabricated lining side wall is exposed in the second hole groove; a third hole groove is reserved on the precast pile 9 corresponding to the second hole groove, and the stress main reinforcement 12 of the precast pile is partially exposed in the third hole groove; the precast pile stressed main reinforcement 12 exposed in the third hole groove is connected with the precast lining side wall stressed main reinforcement 10 in the second hole groove; concrete is poured in the second hole groove, the third hole groove and between the second hole groove and the third hole groove. As shown in fig. 1 and fig. 3, in this embodiment, a second hole groove and a third hole groove are reserved respectively when the prefabricated lining 3 and the prefabricated pile 9 are prefabricated, and simultaneously, the bottom of the stressed main reinforcement 10 of the prefabricated lining side wall is exposed in the second hole groove, and the stressed main reinforcement 12 of the prefabricated pile is partially exposed in the third hole groove, so that the stressed main reinforcement 10 of the prefabricated lining side wall and the stressed main reinforcement 12 of the prefabricated pile are connected in the later period, and the strength of the bottom overlapped region 13 and the integrity of the prefabricated lining 3 and the prefabricated pile 9 are improved.
Furthermore, the precast pile stressed main reinforcement 12 is connected with the precast lining side wall stressed main reinforcement 10 through a spiral reinforcement 11. In the embodiment, the exposed precast pile stressed main reinforcement 12 and the bottom of the precast lining side wall stressed main reinforcement 10 are connected together by adopting the spiral reinforcement 11 to rotate and longitudinally install at the bottom superposition position.
Further, the second hole is disposed at a position corresponding to the prefabricated lining bottom plate 32 on the outer side of the bottom of the prefabricated lining side wall 33.
Furthermore, a fourth hole groove is formed in a position, corresponding to the second hole groove, in a soil layer between the precast pile 9 and the precast pile 9, so that the precast pile 9 and the precast lining side wall 33 are longitudinally connected, and concrete is poured in the fourth hole groove and between the fourth hole groove and the second hole groove.
Further, concrete is poured between the part of the precast pile 9 above the bottom overlapped area 13 and the precast lining side wall 33. In this embodiment, the middle fertilizer groove between the precast pile 9 above the bottom overlapping region 13 and the precast lining side wall 33 may be filled with light foam concrete 8, and the top overlapping region 2 and the bottom overlapping region 13 may be cast with concrete of the same mark as that of the precast structure.
As shown in fig. 1 to fig. 3, the present embodiment further provides a construction method of the above-mentioned superposed structure of the open-cut tunnel precast pile and the precast lining, including the following steps:
1) prefabricating the precast pile 9 in a factory, reserving a third hole groove on the precast pile 9 to expose the precast pile stress main rib 12, and transporting to a construction site to perform pile sinking construction of the precast pile 9;
2) after the precast piles 9 are completely constructed, constructing the crown beam 1 to connect the precast piles 9 as a stressed main body, reserving a first hole groove at a position overlapped with the top of the precast lining 3 in the later period when the crown beam 1 is cast, and exposing the crown beam reinforcement cage 6 for overlapping the later-period connecting reinforcement 5;
3) after the construction of the crown beam 1 is finished, excavating a foundation pit; when the foundation pit is excavated, excavating a fourth hole groove in a soil layer between the precast piles 9 corresponding to the third hole groove so as to facilitate the longitudinal connection between the precast piles 9 and the precast lining side wall 33;
4) prefabricating the prefabricated lining 3 in a factory, reserving a second hole groove at the bottom of the prefabricated lining side wall 33 to expose the stress main rib 10 of the prefabricated lining side wall, transporting to a construction site for installation and splicing, and enabling the prefabricated lining 3 to correspond to the superposed position of the prefabricated pile 9;
5) after the prefabricated lining 3 is installed, adopting spiral steel bars 11 to rotate and longitudinally install at the bottom superposition position, and connecting the prefabricated pile stressed main bars 12 exposed in the third hole groove with the prefabricated lining side wall stressed main bars 10 in the second hole groove; at the top superposition position, connecting a reinforcing steel bar connector 4 at the end part of a stress main bar 7 of the prefabricated lining top plate in the prefabricated lining top plate 31 with a crown beam reinforcing cage 6 exposed in the first hole groove by adopting a connecting reinforcing steel bar 5;
6) after the connection of the bottom and top steel bars is finished, concrete is poured, the second hole groove, the third hole groove, the fourth empty groove, and concrete with the same mark number as that of the prefabricated structure are poured among the second hole groove, the third hole groove and the fourth empty groove to form a bottom overlapped area 13, then light foam concrete 8 is poured at a position of a fat groove between the part of the precast pile 9 above the bottom overlapped area 13 and the prefabricated lining side wall 33, and finally concrete with the same mark number as that of the prefabricated structure is poured among the first hole groove, the prefabricated lining top plate 31 and the crown beam 1 to form a top overlapped area 2.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an open cut tunnel precast pile and superimposed structure of prefabricated lining cutting which characterized in that: the method comprises the steps of prefabricating a lining, a precast pile and a crown beam; the prefabricated lining comprises a prefabricated lining top plate, a prefabricated lining bottom plate and a prefabricated lining side wall; the top of the precast pile is provided with a crown beam, and a crown beam reinforcement cage is arranged in the crown beam; a prefabricated lining top plate stressed main rib is arranged in the prefabricated lining top plate, the prefabricated lining top plate stressed main rib is connected with the crown beam reinforcement cage, and concrete is poured between the prefabricated lining top plate and the crown beam to form a top superposed region; the prefabricated lining side wall is characterized in that prefabricated pile stressed main ribs are arranged in the prefabricated pile, prefabricated lining side wall stressed main ribs are arranged in the prefabricated lining side walls, the bottom of the prefabricated lining side wall stressed main ribs is connected with the prefabricated pile stressed main ribs, concrete is poured between the bottom of the prefabricated lining side walls and the prefabricated pile, and a bottom superposed region is formed.
2. The open-cut tunnel precast pile and precast lining superimposed structure as recited in claim 1, wherein: a first hole groove is reserved on the crown beam, the part of the crown beam reinforcement cage is exposed in the first hole groove, and the prefabricated lining top plate stressed main reinforcement is connected with the crown beam reinforcement cage exposed in the first hole groove through a connecting reinforcement; concrete is poured in the first hole groove and between the prefabricated lining top plate and the crown beam.
3. The open-cut tunnel precast pile and precast lining superimposed structure as recited in claim 2, wherein: the first hole grooves correspond to the precast piles one by one, and the first hole grooves are formed in the positions, close to the precast lining top plate, of the tops of the crown beams.
4. The open-cut tunnel precast pile and precast lining superimposed structure as recited in claim 2, wherein: the end part of the stressed main rib of the prefabricated lining top plate is connected with a reinforcing steel bar connector, and the connecting reinforcing steel bar is connected with the reinforcing steel bar connector.
5. The open-cut tunnel precast pile and precast lining superimposed structure as recited in claim 1, wherein: a second hole groove is reserved at the bottom of the prefabricated lining side wall, and the bottom of the stressed main rib of the prefabricated lining side wall is exposed in the second hole groove; a third hole groove is reserved on the precast pile corresponding to the second hole groove, and the stressed main rib part of the precast pile is exposed in the third hole groove; the precast pile stressed main reinforcement exposed in the third hole groove is connected with the precast lining side wall stressed main reinforcement in the second hole groove; concrete is poured in the second hole groove, the third hole groove and between the second hole groove and the third hole groove.
6. The overlapping structure of the open-cut tunnel precast pile and the precast lining as recited in claim 5, wherein: the precast pile stressed main reinforcement is connected with the precast lining side wall stressed main reinforcement through spiral steel bars.
7. The overlapping structure of the open-cut tunnel precast pile and the precast lining as recited in claim 5, wherein: and the second hole groove is formed in the position, corresponding to the prefabricated lining bottom plate, of the outer side of the bottom of the prefabricated lining side wall.
8. The overlapping structure of the open-cut tunnel precast pile and the precast lining as recited in claim 5, wherein: and a fourth hole groove is formed in the position, corresponding to the second hole groove, in the soil layer between the precast pile and the precast pile, and concrete is poured in the fourth hole groove and between the fourth hole groove and the second hole groove.
9. The open-cut tunnel precast pile and precast lining superimposed structure as recited in claim 1, wherein: concrete is poured between the part of the precast pile above the bottom overlapped area and the precast lining side wall.
10. A construction method of a superposed structure of a precast pile and a precast lining of an open-cut tunnel according to any one of claims 1 to 9, comprising the steps of:
1) prefabricating the precast pile in a factory, reserving a third hole groove to expose the force-bearing main rib of the precast pile, and transporting to a construction site to perform pile sinking construction of the precast pile;
2) after the precast pile is completely constructed, constructing a crown beam, and reserving a first hole groove to expose a crown beam reinforcement cage when the crown beam is cast;
3) after the construction of the top beam is finished, excavating a foundation pit; excavating a fourth hole groove in a soil layer between the precast piles corresponding to the third hole groove during excavation of the foundation pit;
4) prefabricating a prefabricated lining in a factory, reserving a second hole groove at the bottom of the prefabricated lining side wall to expose a stressed main rib of the prefabricated lining side wall, transporting to a construction site for installation and splicing, and enabling the prefabricated lining to correspond to the superposed position of a prefabricated pile;
5) after the prefabricated lining is installed, adopting spiral steel bars to rotate and longitudinally install at the bottom superposition position, and connecting the prefabricated pile stressed main rib exposed in the third hole groove with the prefabricated lining side wall stressed main rib in the second hole groove; connecting a reinforcing steel bar connector at the end part of a stressed main reinforcing steel bar of the prefabricated lining top plate in the prefabricated lining top plate with a crown beam reinforcing cage exposed in the first hole groove by adopting a connecting reinforcing steel bar at the top superposition position;
6) and after the connection of the bottom and top reinforcing steel bars is finished, concrete is poured between the second hole groove, the third hole groove, the fourth empty groove and the second hole groove and between the third hole groove and the fourth empty groove to form a bottom superposed region, then concrete is poured between the part of the precast pile above the bottom superposed region and the precast lining side wall, and finally concrete is poured between the first hole groove and the precast lining top plate and the crown beam to form a top superposed region.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011486475.8A CN112323776A (en) | 2020-12-16 | 2020-12-16 | Open-cut tunnel precast pile and precast lining superimposed structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011486475.8A CN112323776A (en) | 2020-12-16 | 2020-12-16 | Open-cut tunnel precast pile and precast lining superimposed structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982482A (en) * | 2021-02-06 | 2021-06-18 | 中国建筑西南设计研究院有限公司 | Enclosure pile assembly, underground structure and construction method |
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2020
- 2020-12-16 CN CN202011486475.8A patent/CN112323776A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112982482A (en) * | 2021-02-06 | 2021-06-18 | 中国建筑西南设计研究院有限公司 | Enclosure pile assembly, underground structure and construction method |
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