CN113266017B - Regulation and storage tank construction method based on 'permanent-face integrated' inner support structure of deep foundation pit - Google Patents
Regulation and storage tank construction method based on 'permanent-face integrated' inner support structure of deep foundation pit Download PDFInfo
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- CN113266017B CN113266017B CN202110658453.3A CN202110658453A CN113266017B CN 113266017 B CN113266017 B CN 113266017B CN 202110658453 A CN202110658453 A CN 202110658453A CN 113266017 B CN113266017 B CN 113266017B
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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
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- 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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- E03—WATER SUPPLY; SEWERAGE
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- E03F5/00—Sewerage structures
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Abstract
The invention discloses a regulating and storing pool construction method based on a 'permanent-faced integrated' inner support structure of a deep foundation pit, which comprises a horizontal support and a vertical support, wherein the horizontal support comprises a first reinforced concrete horizontal support and a second reinforced concrete horizontal support, and is respectively used as a second layer frame beam and a third layer frame beam of an underground rainwater regulating and storing pool main structure, and the vertical support is simultaneously used as a frame column of the underground rainwater regulating and storing pool main structure; the main structure of the underground rainwater storage tank further comprises a top plate, a bottom plate, side walls, other frame beams and frame columns. The invention changes the traditional temporary support system needing to be dismantled, and the formed inner support structure can be used as a main stressed part of the main structure of the underground rainwater storage tank after the foundation pit is excavated; the invention reduces the safety risk caused by the temporary support dismantling process and the stress conversion, avoids the waste of materials and environmental pollution, shortens the construction period, and has important practical significance and engineering application value.
Description
Technical Field
The invention relates to the technical field of deep foundation pit supporting systems, in particular to a construction method of a storage regulation pool based on a 'permanent-temporary integrated' inner support structure of a deep foundation pit.
Background
Conventional deep foundation pit supporting structures mostly adopt a temporary structure, and after the construction of a main body structure is completed, the supporting structures quit working and are dismantled or abandoned underground, so that great waste is caused. The design of the deep foundation pit inner support based on 'permanent-face integration' is to convert the supporting structure in the foundation pit into a main structure, the inner support does not need to be dismantled, the material waste is avoided, the waste of manpower, material resources and social resources caused by the material waste is avoided, meanwhile, the influence caused by secondary stress and secondary deformation of the foundation pit retaining pile in the process of dismantling the inner support is avoided, the permanence of the supporting structure is realized, and the deep foundation pit inner support has the advantages of high efficiency, energy conservation, green environment, construction period shortening and the like, and is a novel supporting form which is rapidly developed and applied in the field of deep foundation pit engineering in China in recent years.
The design and construction technology of the combination of the inner support of the deep foundation pit and the structure integration is introduced on the background of the engineering project of the ultra-large deep foundation pit of the Kunming spiral shell bay, such as the beam dream. Li Lilianxiang and the like are combined with the foundation pit engineering practice of Jinan, and the whole process analysis is carried out on the stress deformation characteristics of the permanent supporting structure combining the supporting piles and the underground main structure. Zhang Yi combines with a foundation pit engineering example of a certain storage pool, and comprehensively compares and analyzes 2 schemes of separation design and combination design of a temporary supporting structure of a foundation pit and a permanent structure of a main engineering in 4 aspects of investment, implementation difficulty, safety and construction period to obtain a conclusion that the combination design scheme is more in line with the requirements of structural safety and engineering economy.
The design of the 'permanent-faced integrated' horizontal inner support of the deep foundation pit of the storage tank is based on the full play of the underground rainwater storage tank main body underground structure function, and the underground structure beam of the storage tank main body simultaneously bears the horizontal inner support member function during the foundation pit excavation. The inner support of the foundation pit is still designed according to the requirements of safety and stability, and the design scheme of 'permanent-to-face integration' does not change the number and the plane distribution position of the supporting systems of the horizontal and vertical inner supports of the deep foundation pit, does not change the excavation mode of the foundation pit, the material transportation and the earth and rockfill unearthing route, and only replaces the horizontal inner support with the main structure beam of the storage tank. Compared with the temporary horizontal inner support of the deep foundation pit, the 'permanent-faced integrated' horizontal inner support of the deep foundation pit of the storage regulation pool does not need to be dismantled, so that the waste of materials and the waste of manpower, material resources and social resources caused by the material waste are avoided; meanwhile, the influence caused by secondary stress and secondary deformation of the foundation pit fender pile in the inner support dismantling process is avoided.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a construction method of a storage tank based on a 'permanent-temporary integrated' inner support structure of a deep foundation pit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a regulation and storage tank construction method based on a 'permanent-face integrated' inner support structure of a deep foundation pit comprises the following steps:
firstly, deep foundation pit excavation and inner support structure setting:
(a) slope releasing and excavating:
constructing a deep mixing pile waterproof curtain with the periphery closed at the position, close to the slope surface, of the top of the slope, digging the foundation pit to the slope bottom, arranging slope planting ribs for reinforcement, spraying cement for leveling, and arranging drainage ditches on the outer side of the top of the slope and the inner side of the slope bottom;
(b) constructing the fender post and the pit inner upright post:
and constructing a cast-in-situ bored pile fender pile at the position, close to the excavation surface, of the bottom of the semi-open slope of the deep foundation pit of the storage tank according to the designed depth, and constructing a high-pressure jet grouting pile, a cement soil deep mixing pile and a pit inner upright pile according to the designed position, depth and the like. The vertical column in the pit is formed by a structure form that a steel vertical column is inserted into a vertical column pile foundation, the steel vertical column at the upper part is a lattice column formed by welding 4 equal-edge angle steels and batten plates, and the vertical column pile foundation at the lower part is a reinforced concrete bored pile foundation;
(c) excavating, and constructing an underground two-layer main structure frame beam which is also used as a first horizontal support:
excavating a soil body in a foundation pit to a position 20-30 cm below the designed height of the bottom of a first horizontal support, arranging a crown beam at the top of a fender pile, realizing the connection between the horizontal support and the fender pile through the crown beam, embedding a steel bar connector at the connecting part of the horizontal support and the side wall of the main structure of the regulation and storage pool, chiseling the steel bar connector when the side wall is constructed, and completing the connection between the horizontal support and the side wall; the connecting part of the horizontal support and the steel upright post is connected by a beam side haunching method; binding steel bars, supporting templates and pouring concrete according to the design sizes and the plane positions of the crown beams and the horizontal supports to finish the construction of the first horizontal support which is also used as the second layer of frame beams of the main structure;
(d) excavating, and applying an underground rainwater regulation pool main structure frame beam which is also used as a second horizontal support:
continuously excavating the rock soil body in the foundation pit to a position 20-30 cm below the designed height of the bottom of the second horizontal support, arranging a waist beam in the middle of the inner side wall of the enclosure pile, realizing the connection between the horizontal support and the enclosure pile through the waist beam, embedding a steel bar connector at the connecting part of the horizontal support and the side wall of the main structure of the regulation and storage pool, chiseling the steel bar connector when the side wall is constructed, and completing the connection between the horizontal support and the side wall; the connecting part of the horizontal support and the steel upright post is connected by a beam side haunching method; and binding steel bars, supporting templates and pouring concrete according to the design sizes and the plane positions of the waist beam and the horizontal support to finish the construction of the second horizontal support which is also used as the third layer of the frame beam of the main structure.
(e) Excavating, constructing a structural bottom plate:
and (4) continuously excavating the rock soil body in the foundation pit to the designed height of the foundation, binding reinforcing steel bars, supporting the template, pouring concrete to form a foundation pit bottom plate, and finishing the excavation operation of the foundation pit.
Secondly, construction of a main structure of the storage regulation pool:
(f) construct underground major structure post, roof beam, wall, board from bottom to top:
according to the design requirement of the main structure of the storage pond, a new horizontal reinforcement cage is additionally arranged on the main beam body structure of the first horizontal support and the second horizontal support, and burrs are formed on the side walls of the crown beam, the waist beam, the first horizontal support and the second horizontal support, so that two ends of the new horizontal reinforcement cage are erected at the burrs, and the first horizontal support and the second horizontal support respectively form a two-layer frame structure;
according to the supporting requirement, a new vertical reinforcement cage is additionally arranged at a node of the frame, so that the bottom end of the new vertical reinforcement cage is contacted with the back cover, the top end of the new vertical reinforcement cage always extends out of the deep foundation pit by the height, and a heightened vertical reinforcement cage also extends out of the position of the original steel upright column, so that the heightened vertical reinforcement cage is consistent with the height of the new vertical reinforcement cage;
arranging a plurality of vertical reinforcement cages for bearing at the edge of the back cover of the deep foundation pit, wherein the top ends of the vertical reinforcement cages for bearing are consistent with the top ends of the heightened vertical reinforcement cages, fixing the vertical reinforcement cages for bearing on the inner side walls of the fender posts through bar planting, and erecting a reinforcement grid in a square formed by the vertical reinforcement cages for bearing, the crown beams and the waist beams;
binding a horizontal circle of reinforcement cages at the top ends of all the vertical reinforcement cages for bearing, adding the horizontal reinforcement cages for bearing inside the circle of reinforcement cages according to bearing requirements, binding a layer of reinforcement grating on the top surface and the bottom surface of the circle of reinforcement cages respectively, reserving a square manhole, binding a circle of cubic vertical reinforcement cylinders around the top surface of the manhole, and making the top end of each vertical reinforcement cylinder higher than the ground height before slope excavation;
the method comprises the following steps of erecting formworks on the periphery of a new horizontal reinforcement cage, a new vertical reinforcement cage and a heightened vertical reinforcement cage, erecting formworks on the inner sides of a bearing vertical reinforcement cage and a reinforcement grid in the bearing vertical reinforcement cage, erecting a layer of formworks above and below the bearing horizontal reinforcement cage and the reinforcement grid in the bearing horizontal reinforcement cage, erecting formworks on the periphery of a vertical reinforcement cylinder to enable the formworks to be mutually communicated and form a relatively sealed cavity structure, pouring concrete under pressure from the formwork at the top end of the vertical reinforcement cylinder, and performing one-step pouring forming to form a top plate, a second layer and a third layer of grid-shaped frame beams, frame columns connected at the joints of the frame beams, side walls and a cubic manhole channel, wherein the side walls and the cubic manhole channel are integrated with surrounding piles, the underground rainwater storage tank main structure is designed and is specifically a hollow structure of the top plate, the side walls and a bottom plate, and the 'well' -shaped grid-shaped beam-column structure formed by crossing the frame beams and the frame columns in the underground rainwater storage tank, the hollow structure forms a sealed space which can be used for water storage of a regulation and storage pool in a water-facing area;
(g) backfilling a structural top plate, and recovering the ground:
and after the main structure of the storage tank is constructed and reaches the design requirement, backfilling a fresh soil body on the upper surface of the structure top plate to restore the ground to the state before slope excavation, constructing vegetation or public facilities, and completing the structural construction of the storage tank.
Preferably, the vertical supports in the pit are formed by a structure form that steel upright posts are inserted into upright post pile foundations; the upper steel upright is specifically a lattice column formed by welding 4 equal-edge angle steels and batten plates, and the lower upright pile foundation is a reinforced concrete bored pile foundation;
the structure that the connecting node of the first reinforced concrete horizontal support and the second reinforced concrete horizontal support and the vertical support is completed by an armpit method at the beam side of the angle steel lattice column is specifically as follows: the width of a beam at the node position of the beam column is enlarged in a mode of adding an armpit at the beam side by a beam side armpit method, so that main reinforcements of the first reinforced concrete horizontal support or the second reinforced concrete horizontal support can be communicated by bypassing the side surface of the angle steel lattice column;
the first reinforced concrete horizontal support is used as a second layer of frame beam of the main structure of the underground rainwater storage tank, the second reinforced concrete horizontal support is used as a third layer of frame beam of the main structure of the underground rainwater storage tank, the vertical support is used as a frame column of the main structure of the underground rainwater storage tank, and the back cover is used as a bottom plate of the main structure of the underground rainwater storage tank.
Preferably, the first reinforced concrete horizontal support and the second reinforced concrete horizontal support are grid-distributed reinforced concrete structures formed by intersecting a plurality of beam bodies in two longitudinal and transverse directions, any one of the beam bodies is formed by pouring concrete through a rectangular or square reinforcement cage, two ends of any one of the beam bodies are respectively connected with a reinforcement connector on the inner side wall of the enclosure pile, and the reinforcement cage of the beam body is bound with the reinforcement structure in the enclosure pile and then is added with a template to be poured simultaneously to form an integral pouring structure.
Preferably, the vertical support is a vertical column structure formed by pouring concrete on a lattice column, the lattice column is a square column formed by welding four rows of angle steel bars section by section through a quadrilateral iron sheet ring, strip-shaped holes are formed in the middle of four sides of the lattice column and used for inserting steel bars and binding the steel bars, and the bottom end of the vertical support penetrates through the back cover and extends into a foundation of the reinforced concrete bored pile;
vertical support and reinforced concrete bored concrete pile basis structure of pouring as an organic whole, specific structure is: during the lattice column extended to the cylindrical steel reinforcement cage of reinforced concrete bored concrete pile basis, passed the bar hole of lattice column in proper order through horizontally stub bar, stub bar both ends and cylindrical steel reinforcement cage ligature, stub bar middle part and lattice column ligature, lattice column and cylindrical steel reinforcement cage ligature are simultaneously gone down to punching a hole, and the concrete of pouring of reinforced concrete bored concrete pile basis oral area obtains vertical support lower part and the integrative casting structure of reinforced concrete bored concrete pile basis.
Preferably, anti-cracking nets are lined on the outer surfaces of the casting layers of the first reinforced concrete horizontal support, the second reinforced concrete horizontal support and the vertical support, so that cement is prevented from falling off.
Preferably, the specific structural details of the underground rainwater storage tank main body structure obtained in the step (f) are described as follows: the device comprises a bottom plate arranged below a third layer of frame beam, a top plate arranged above a second layer of frame beam, side walls, frame beams and frame columns;
the underground main structure frame beam and the column of the storage tank are designed strictly according to the requirements of structural stress, deformation and the like; the horizontal and vertical inner support supporting system of the deep foundation pit of the storage tank is designed strictly according to the supporting requirements of the deep foundation pit; under the precondition that the number and the plane distribution position of a deep foundation pit horizontal and vertical inner support supporting system are not changed, the excavation mode of a foundation pit, the material transportation, the earth and stone unearthing route and the like are not changed, the stress and elevation distribution conditions of the inner support and an underground main body structure are enabled to be realized only by slightly adjusting the vertical position of the inner support on the premise that the safety of the foundation pit excavation is met, and then the horizontal inner support and the vertical inner support of the deep foundation pit simultaneously bear the functions of a frame beam and a column of the underground main body structure, so that the integration of the temporary supporting structure of the deep foundation pit and the underground main body permanent structure of the regulation and storage pool is realized;
the side wall is of a cast-in-place concrete structure, and the outer wall of the side wall is tightly attached to the inner side wall of the fender post;
the bottom plate is the back cover, and the top plate is a cast-in-place plate structure formed by binding top steel bar beams with the top of the side steel bar cage frame of the side wall and the top end of the frame column, binding steel bar grids in grids formed by adjacent top steel bar beams and finally pouring cement mortar through a formwork.
Therefore, the key points of the invention are how to convert the inner support structure excavated by the deep foundation pit into the main structure of the subsequent underground rainwater storage tank: according to the structural requirements of the storage regulation pool, a new horizontal beam needs to be added to the original horizontal support to form a new frame beam; extending the original vertical supports to the top plate, and adding new vertical columns at some nodes of the horizontal supports to form new frame columns; after the requirement of mechanical calculation is met, the number of the lattice columns can be far smaller than the number of nodes, and the excavation stage of the foundation pit is easily influenced due to the excessive number of the lattice columns; after excavation of the foundation pit is finished, new lattice columns can be erected at nodes where vertical supports are not erected, the top ends of the new lattice columns are in contact with the top plate, the bottom ends of the new lattice columns are in contact with the bottom plate, and then steel bar binding, grid laying and cast-in-place are carried out according to the structure of the main structure of the underground rainwater storage tank, so that the required structure is obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. aiming at the structural characteristics of the existing deep foundation pit supporting system, the temporary supporting system to be dismantled is changed, an inner supporting structure is formed by horizontally supporting two reinforced concrete beam bodies and arranging a pouring column body formed by angle steel lattice columns at partial nodes, and a square reinforcement cage, an oblique reinforcement, a reducing reinforcement ring and a connecting structure of a blocking reinforcement are arranged at the joint of the nodes; the inner supporting structure can be used as a main stress part of the main structure of the underground rainwater storage tank after foundation pit excavation, such as a first reinforced concrete horizontal support and a second layer frame beam of the main structure of the underground rainwater storage tank, a second reinforced concrete horizontal support and a third layer frame beam of the main structure of the underground rainwater storage tank, and a vertical support and a frame column of the main structure of the underground rainwater storage tank.
2. In addition, the invention also provides a concrete structure of the main body structure of the underground rainwater storage tank serving as the near-water storage tank, namely, a bottom plate, a top plate and a wall are constructed outside the bearing beam column serving as the inner support structure to form a sealed water storage tank structure.
3. The invention reduces the safety risk caused by the temporary support dismantling process and the stress conversion, avoids the waste of materials and environmental pollution, shortens the construction period, and has important practical significance and engineering application value.
Drawings
FIG. 1 is a schematic view of a permanent-faced integrated inner support structure of a deep foundation pit formed in the excavation process of the deep foundation pit in the construction method of the invention;
FIG. 2 is a schematic diagram of the main structure of the underground rainwater storage tank formed by adding beams, columns, plates and walls on the basis of the 'permanent-faced integrated' inner support structure of the deep foundation pit;
FIG. 3 is a schematic perspective view of the connection between a horizontal support and a fender post in the "permanent-face integrated" inner support structure of the deep foundation pit obtained in the invention;
FIG. 4 is a schematic diagram of a steel bar connection structure between a horizontal support and a fender post in the 'permanent-faced integrated' inner support structure of the deep foundation pit obtained by the invention;
FIG. 5 is a schematic diagram of a beam-side haunching structure at a node of a lattice column and a horizontally-supported reinforcement cage main body in the 'permanent-face integrated' inner support structure of the deep foundation pit obtained in the invention;
FIG. 6-1 is a construction state diagram of a slope excavation process, which is a first process of embodiment 2 of the present invention;
FIG. 6-2 is a second flow chart of the construction of the envelope and the pillars in the pit according to embodiment 2 of the present invention;
FIG. 6-3 is a construction state diagram of the third flow of the present invention, namely, the construction of the first horizontal support;
6-4 are the construction state diagram of the fourth flow of the embodiment 2 of the invention, namely the second horizontal support;
6-5 are the fifth flow of the invention embodiment 2-the construction state diagram of the construction structure bottom plate;
6-6 are the construction state diagram of the sixth process of the embodiment 2 of the invention, namely the construction of the underground main body structure;
FIGS. 6 to 7 are views showing a seventh flow of the construction of backfilling a structural ceiling according to embodiment 2 of the present invention;
in the figure: the system comprises a fender pile 1, a horizontal support 2, a first reinforced concrete horizontal support 201, a second reinforced concrete horizontal support 202, a vertical support 3, a crown beam 4, a waist beam 5, a back cover 6, a reinforced concrete cast-in-situ bored pile foundation 7, an underground rainwater storage tank main body structure 12, a top plate 13 and a side wall 14.
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.
Example 1:
1) the improved design idea of the traditional deep foundation pit inner supporting structure is as follows:
based on the characteristic analysis of the 'permanent-faced integrated' inner support structure of the deep foundation pit and combined with the deep foundation pit engineering practice of the rainwater storage tank, by the comparative analysis of the underground structure of the storage pond and the deep foundation pit supporting characteristic system, based on the idea that the main structure frame beam column simultaneously bears the functions of the horizontal and vertical inner supporting members during the excavation of the foundation pit, the 'permanent-face integrated' inner supporting optimization scheme of the deep foundation pit is provided without changing the horizontal and vertical inner supporting structure form, the section size, the number and the plane distribution position of the deep foundation pit and the excavation mode of the foundation pit, the material transportation and the earth and stone unearthing route, and the key technology and implementation steps are set forth, the safety risk caused by the temporary support dismantling process and stress conversion is reduced, the material waste and the environmental pollution are avoided, the construction period is shortened, and the method has important practical significance and engineering application value.
2) And (3) scheme optimization:
the main engineering body of the storage tank integrally adopts an underground three-layer frame structure system, wherein the designed relative elevations of the top surfaces of the underground two-layer frame beam and the underground three-layer frame beam are-9.3 m and-13.3 m in sequence. The relative elevations of the top surfaces of the first horizontal support and the second horizontal support of the original design of the deep foundation pit of the storage regulation pool are respectively-7.3 m and-12.3 m, and slope excavation is carried out within the depth range of 7.0m below the earth surface. Therefore, the excavation height of the foundation pit slope setting is adjusted to 9.0m from 7.0m, and the top surface elevation of the first horizontal support of the foundation pit can be consistent with the top surface elevation of the main structure frame beam; the elevation of the top surface of the second horizontal support of the foundation pit is reduced by 1.0m (namely-13.3 m) and is consistent with the elevation of the underground three-layer frame beam of the main structure, and the distance between the two horizontal supports of the foundation pit is adjusted to 4.0m from the original design of 5.0 m. The horizontal and vertical supporting structure forms, section sizes, quantity and plane distribution positions of the foundation pit are kept unchanged from the original design so as to maintain the foundation pit excavation mode, material transportation and earth and stone unearthing routes unchanged.
3) Connection design of nodes
The connection mode of the horizontal inner support of the deep foundation pit and the guard pile based on 'permanent-temporary integration' is kept unchanged from the original design, and the connection is still realized through the mode of the crown beam and the waist beam. The horizontal support is connected with the main body engineering side span structure pile, a steel bar connector is embedded in a connecting position through the horizontal support, the steel bar connector is chiseled out when the side span structure pile is constructed, and the connection with the side span structure pile is completed, as shown in fig. 4. The connecting node of the horizontal support and the vertical inner support is completed by a beam side haunching method of the angle steel lattice column. The beam side armoring method enlarges the width of a beam at the node position of a beam column in a beam side armoring mode, so that main ribs of the beam can be communicated with the side surface of the angle steel lattice column in a bypassing mode. The latticed column forms a permanent frame column of the main engineering structure in a concrete-wrapped mode after the foundation pit is excavated.
4) The specific implementation process comprises the following steps:
firstly, constructing a deep mixing pile waterproof curtain with the periphery closed at the position close to the slope surface on the top of a slope, and excavating a foundation pit slope to the elevation of the slope bottom (namely-9.0 m); then, constructing a slope bottom cast-in-situ bored pile, a high-pressure jet grouting pile and a cement deep mixing pile, and constructing a pit inner upright pile and a steel upright at the same time; then, excavating the soil body to the elevation of-10.1 m, constructing an underground two-layer main structure frame beam which also serves as a horizontal support, arranging a replacement support device between the support and the fender post, and arranging a connecting device between the support and the vertical support structure; then, excavating the soil body to-14.1 m of elevation, constructing an underground three-layer main structure frame beam which also serves as a second horizontal support, and arranging a connecting device with the fender post and the vertical supporting structure; then, continuously excavating the soil body to the base elevation, constructing a foundation pit bottom plate, and finishing the foundation pit excavation operation; and finally, constructing underground main structure columns, beams, walls, plates and the like from bottom to top in sequence to complete the construction of the underground main structure engineering.
5) The specific structural description of the deep foundation pit 'permanent-face integrated' inner support structure is as follows:
referring to fig. 1 and 3-5, the foundation pit supporting structure comprises horizontal supports 2 arranged on the side walls of a fender post 1 of a deep foundation pit and vertical supports 3 erected in the deep foundation pit, wherein each horizontal support 2 comprises a first reinforced concrete horizontal support 201 arranged at a position close to the top of the inner side wall of the fender post 1 and a second reinforced concrete horizontal support 202 arranged at the middle position of the inner side wall of the fender post 1, and the top surface height of each first reinforced concrete horizontal support 201 is smaller than the top height of the inner side wall of the fender post 1; a crown beam 4 is cast at the position of the inner side wall of the top of the fender pile 1, a first reinforced concrete horizontal support 201 is inserted into the crown beam 4 through a reinforced connector, a waist beam 5 is cast at the position of the inner side wall of the middle part of the fender pile 1, and a second reinforced concrete horizontal support 202 is inserted into the waist beam 5 through a reinforced connector; the bottom wall of the deep foundation pit is provided with a back cover 6; the vertical support 3 is formed by a structure form that a steel upright post is inserted into an upright post pile foundation; the upper steel upright column is a lattice column formed by welding 4 equal-edge angle steels and batten plates, and the lower upright column pile foundation is a reinforced concrete cast-in-situ bored pile foundation 7; the structure that the first reinforced concrete horizontal brace 201 and the second reinforced concrete horizontal brace 202 and the vertical brace 3 are connected through the beam side haunching method of the angle steel lattice column is specifically as follows: the width of a beam at the node position of the beam column is enlarged in a beam side armoring way by a beam side armoring method, so that main reinforcements of the first reinforced concrete horizontal support 201 or the second reinforced concrete horizontal support 202 can pass through the side surface of the angle steel lattice column in a bypassing way; the first reinforced concrete horizontal support 201 is also used as a second layer of frame beam of the underground rainwater storage tank main structure 12, the second reinforced concrete horizontal support 202 is also used as a third layer of frame beam of the underground rainwater storage tank main structure 12, the vertical support 3 is also used as a frame column of the underground rainwater storage tank main structure 12, and the back cover 6 is also used as a bottom plate of the underground rainwater storage tank main structure 12;
referring to fig. 1, a first reinforced concrete horizontal support 201 and a second reinforced concrete horizontal support 202 are both grid-distributed reinforced concrete structures formed by intersecting a plurality of longitudinal and transverse beams, any beam is formed by pouring concrete through a rectangular or square reinforcement cage, two ends of any beam are respectively connected with a reinforcement connector on the inner side wall of a fender post 1, and the reinforcement cage of the beam is bound with the reinforcement structure in the fender post 1 and then is poured with a template to form an integral pouring structure;
referring to fig. 1, the vertical support 3 is a vertical column structure formed by pouring concrete on a lattice column, the lattice column is a square column formed by welding four rows of angle steel bars section by section through a quadrilateral iron sheet ring, strip-shaped holes are formed in the middle of four sides of the lattice column and used for inserting steel bars and binding the steel bars, and the bottom end of the vertical support 3 penetrates through the back cover 6 and extends into a reinforced concrete bored pile foundation 7; vertical support 3 and reinforced concrete bored concrete pile basis 7 structure of pouring as an organic whole, concrete structure is: the lattice column extends into a cylindrical reinforcement cage of a reinforced concrete cast-in-situ bored pile foundation 7, a horizontal short reinforcement sequentially penetrates through a strip-shaped hole of the lattice column, two ends of the short reinforcement are bound with the cylindrical reinforcement cage, the middle part of the short reinforcement is bound with the lattice column, the lattice column and the cylindrical reinforcement cage are bound and simultaneously fall into a punched hole, and concrete is poured at the opening part of the reinforced concrete cast-in-situ bored pile foundation 7 to obtain an integral pouring structure of the lower part of the vertical support 3 and the reinforced concrete cast-in-situ bored pile foundation 7;
referring to fig. 5, the top ends of the vertical supports 3 sequentially pass through the grid nodes of the reinforced concrete structures of the first reinforced concrete horizontal support 201 and the second reinforced concrete horizontal support 202, and the vertical supports 3 and the first reinforced concrete horizontal support 201 and the second reinforced concrete horizontal support 202 are respectively of an integral casting structure;
referring to fig. 1, the outer surfaces of the casting layers of the first reinforced concrete horizontal support 201, the second reinforced concrete horizontal support 202 and the vertical support 3 are all lined with anti-cracking nets to prevent cement from falling off.
6) The concrete structure description of underground rainwater regulation pond major structure:
referring to fig. 2, the underground rainwater storage main body structure 12 includes a bottom plate disposed below the third layer of frame beams, a top plate 13 disposed above the second layer of frame beams, side walls 14 enclosing edges of the bottom plate and the top plate 13, frame beams, and frame columns; the frame beams comprise a second layer of frame beams and a third layer of frame beams, the second layer of frame beams are specifically a grid-shaped crossed beam body structure consisting of a first reinforced concrete horizontal support 201 and horizontal beams bound on the first reinforced concrete horizontal support 201, and the third layer of frame beams are specifically a grid-shaped crossed beam body structure consisting of a second reinforced concrete horizontal support 202 and horizontal beams bound on the second reinforced concrete horizontal support 202; the frame column comprises a steel upright column at the upper part of the vertical support 3 and a plurality of vertical columns which are parallel to the steel upright column, the vertical columns are of a reinforced concrete structure, and the top ends of the steel upright column and the vertical columns extend to the top plate 13 through lengthened reinforced concrete; the side wall 14 is a cast-in-place wall structure formed by binding a first reinforced concrete horizontal support 201 and side reinforced cage frames with the same diameter as the beam body reinforced cage at each end part, inserting a reinforced bar grating in the side reinforced cage frames, and finally pouring cement mortar by a formwork, wherein the outer wall of the side wall 14 is tightly attached to the inner side wall of the enclosure pile 1, namely the side wall 14 wraps a reinforced connector; the bottom plate is the back cover 6, the top plate 13 is a cast-in-place plate structure formed by binding top steel bar beams with the top of the steel bar cage frame at the side of the side wall 14 and the top end of the frame column, binding steel bar grids in grids formed by adjacent top steel bar beams and finally pouring cement mortar by a formwork; the underground rainwater storage tank main body structure 12 is specifically a hollow structure composed of a top plate 13, side walls 14 and a bottom plate, and is internally provided with a grid-shaped beam column structure formed by frame beams and frame columns in a crossed mode, and the hollow structure forms a sealed space and can be used for water storage of a storage tank in a water-facing area.
Example 2:
according to the technical guidance of the embodiment 1, a more specific construction flow chart can be obtained by combining specific construction practice, namely the implementation of the tight comprehensive clean three-flush rainwater storage tank deep foundation pit engineering practice of the inner support permanent intensive construction scheme flow can be divided into 7 key steps.
The first step is as follows: slope-laying excavation
Placing a slope top close to the slope surface at the periphery of a deep foundation pit of the rainwater storage tank, and constructing a deep mixing pile waterproof curtain with the periphery closed according to the designed depth; and (3) adopting half-slope-releasing layered excavation for 9m below the ground, wherein the excavation thickness of each layer is 4.5m, and the slope ratio is 1: 1, two stages of excavation platforms are arranged, as shown in figure 6-1.
The second step: construction enclosure structure and pit inner upright post
And constructing a bored pile enclosure structure at the position, close to the excavation surface, of the slope bottom of the deep foundation pit of the storage pond, according to the designed depth, and constructing a high-pressure jet grouting pile, a cement deep mixing pile and a pit inner upright pile according to the designed position, depth and the like. The vertical column in the pit is formed by inserting a steel vertical column into a structural form of 'one column and one pile' of a vertical column pile foundation, the steel vertical column on the upper portion is a lattice column formed by welding 4 equal angle steels and batten plates, and the vertical column pile foundation on the lower portion is a reinforced concrete bored pile foundation, as shown in fig. 6-2.
The third step: digging, constructing the first horizontal support
Excavating a soil body in a pit of the foundation pit to a position which is 20-30 cm below a designed elevation (-10.1 m elevation) of the bottom of the first reinforced concrete horizontal support; pouring a concrete cushion layer, binding reinforcing steel bars, pouring to finish the reinforced concrete support, and finishing the first reinforced concrete horizontal support which is also used as the underground two-layer main structure frame beam of the storage pond, as shown in figure 6-3.
The fourth step: excavating and constructing a second horizontal support
Excavating the stratum in the foundation pit to be 20-30 cm below the designed elevation (-10.1 m elevation) of the bottom of the second reinforced concrete horizontal support; and pouring a concrete cushion layer, binding reinforcing steel bars, pouring to finish the reinforced concrete support, and finishing the second reinforced concrete horizontal support which is also used as the underground three-layer main structure frame beam of the storage pond, as shown in fig. 6-4.
The fifth step: bottom plate of excavation and construction structure
Excavating an inner ground layer of the foundation pit to reach a designed elevation of a foundation pit base, binding reinforcing steel bars, supporting templates and pouring concrete to form a foundation pit bottom plate, and finishing the excavation operation of the foundation pit, as shown in fig. 6-5;
and a sixth step: column, beam, wall and plate for constructing underground main structure from bottom to top
Can be used for water storage of a regulating storage tank in a water-facing area, as shown in figures 6-6.
The seventh step: backfilling the structural top plate and recovering the ground
And after the construction of the main structure of the storage tank is finished and the design requirement is met, backfilling a fresh soil body on the upper surface of the structural top plate to restore the ground to a state before slope releasing and excavation, constructing vegetation or public facilities, and completing the construction of the storage tank structure, as shown in fig. 6-7.
Example 3:
under the suggestion of the underground rainwater storage tank main body structure 12 of the embodiment 1, the structure is easily improved to be used for a three-layer basement building of urban foundation engineering, and the specific structural improvement is as follows: the number of lattice columns inserted into the reinforced concrete bored pile foundation 7 is set according to the requirement of the bearing vertical support 3, the room layout of the basement is planned and designed according to the number of lattice columns, steel bar grids are bound in grids of longitudinal beam bodies and transverse beam bodies of the first reinforced concrete horizontal support 201 and the second reinforced concrete horizontal support 202, cement mortar is poured into a formwork to form a cast-in-place plate structure, the cast-in-place plate structure where the first reinforced concrete horizontal support 201 and the second reinforced concrete horizontal support 202 are respectively used as a floor of a first layer of a basement and a floor of a second layer of the basement, then a top plate 13 and a fence 14 are respectively constructed, and reserving the room door position and the stair position, and finally adopting the first reinforced concrete horizontal support 201, the second reinforced concrete horizontal support 202 and the vertical support 3 as the main bearing beam column structure of the sealed basement three-layer building.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A regulation and storage tank construction method based on a 'permanent-face integrated' inner support structure of a deep foundation pit is characterized by comprising the following steps:
firstly, deep foundation pit excavation and inner support structure setting:
(a) slope releasing and excavating:
constructing a deep mixing pile waterproof curtain with the periphery closed at the position, close to the slope surface, of the top of the slope, digging the foundation pit to the slope bottom, arranging slope planting ribs for reinforcement, spraying cement for leveling, and arranging drainage ditches on the outer side of the top of the slope and the inner side of the slope bottom;
(b) constructing the fender post and the pit inner upright post:
constructing a cast-in-situ bored pile fender pile at a position, close to an excavation surface, of a semi-slope bottom of a deep foundation pit of the storage pond according to a designed depth, and constructing a high-pressure jet grouting pile, a cement deep mixing pile and an in-pit upright pile according to a designed position and depth; the vertical column in the pit is formed by a structure form that a steel vertical column is inserted into a vertical column pile foundation, the steel vertical column at the upper part is a lattice column formed by welding 4 equal-edge angle steels and batten plates, and the vertical column pile foundation at the lower part is a reinforced concrete bored pile foundation;
(c) excavating, and constructing an underground two-layer main structure frame beam which is also used as a first horizontal support:
excavating a soil body in a foundation pit to a position 20-30 cm below the designed height of the bottom of a first horizontal support, arranging a crown beam at the top of a fender pile, realizing the connection between the horizontal support and the fender pile through the crown beam, embedding a steel bar connector at the connecting part of the horizontal support and the side wall of the main structure of the regulation and storage pool, chiseling the steel bar connector when the side wall is constructed, and completing the connection between the horizontal support and the side wall; the connecting part of the horizontal support and the steel upright post is connected by a beam side haunching method; binding steel bars, supporting templates and pouring concrete according to the design sizes and the plane positions of the crown beams and the horizontal supports to finish the construction of the first horizontal support which is also used as the second layer of frame beams of the main structure;
(d) excavating, and applying an underground rainwater regulation pool main structure frame beam which is also used as a second horizontal support:
continuously excavating the rock soil body in the foundation pit to a position 20-30 cm below the designed height of the bottom of the second horizontal support, arranging a waist beam in the middle of the inner side wall of the enclosure pile, realizing the connection between the horizontal support and the enclosure pile through the waist beam, embedding a steel bar connector at the connecting part of the horizontal support and the side wall of the main structure of the regulation and storage pool, chiseling the steel bar connector when the side wall is constructed, and completing the connection between the horizontal support and the side wall; the connecting part of the horizontal support and the steel upright post is connected by a beam side haunching method; binding reinforcing steel bars, supporting templates and pouring concrete according to the design sizes and the plane positions of the waist beams and the horizontal supports to finish the construction of a second horizontal support which is also used as a third layer of frame beam of the main structure;
(e) excavating, constructing a structural bottom plate:
continuously excavating the rock soil body in the foundation pit to a designed height of the base, binding reinforcing steel bars, supporting templates and pouring concrete to form a foundation pit bottom plate, and finishing the excavation operation of the foundation pit;
secondly, construction of a main structure of the storage regulation pool:
(f) construct underground major structure post, roof beam, wall, board from bottom to top:
according to the design requirement of the main structure of the storage pond, a new horizontal reinforcement cage is additionally arranged on the main beam body structure of the first horizontal support and the second horizontal support, and burrs are formed on the side walls of the crown beam, the waist beam, the first horizontal support and the second horizontal support, so that two ends of the new horizontal reinforcement cage are erected at the burrs, and the first horizontal support and the second horizontal support respectively form a two-layer frame structure;
according to the supporting requirement, a new vertical reinforcement cage is additionally arranged at a node of the frame, so that the bottom end of the new vertical reinforcement cage is contacted with the back cover, the top end of the new vertical reinforcement cage always extends out of the deep foundation pit by the height, and a heightened vertical reinforcement cage also extends out of the position of the original steel upright column, so that the heightened vertical reinforcement cage is consistent with the height of the new vertical reinforcement cage;
arranging a plurality of vertical reinforcement cages for bearing at the edge of the back cover of the deep foundation pit, wherein the top ends of the vertical reinforcement cages for bearing are consistent with the top ends of the heightened vertical reinforcement cages, fixing the vertical reinforcement cages for bearing on the inner side walls of the fender posts through bar planting, and erecting a reinforcement grid in a square formed by the vertical reinforcement cages for bearing, the crown beams and the waist beams;
binding a horizontal circle of reinforcement cages at the top ends of all the vertical reinforcement cages for bearing, adding the horizontal reinforcement cages for bearing inside the circle of reinforcement cages according to bearing requirements, binding a layer of reinforcement grating on the top surface and the bottom surface of the circle of reinforcement cages respectively, reserving a square manhole, binding a circle of cubic vertical reinforcement cylinders around the top surface of the manhole, and making the top end of each vertical reinforcement cylinder higher than the ground height before slope excavation;
the method comprises the following steps of erecting formworks on the periphery of a new horizontal reinforcement cage, a new vertical reinforcement cage and a heightened vertical reinforcement cage, erecting formworks on the inner sides of a bearing vertical reinforcement cage and a reinforcement grid in the bearing vertical reinforcement cage, erecting a layer of formworks above and below the bearing horizontal reinforcement cage and the reinforcement grid in the bearing horizontal reinforcement cage, erecting formworks on the periphery of a vertical reinforcement cylinder to enable the formworks to be mutually communicated and form a relatively sealed cavity structure, pouring concrete under pressure from the formwork at the top end of the vertical reinforcement cylinder, and performing one-step pouring forming to form a top plate, a second layer and a third layer of grid-shaped frame beams, frame columns connected at the joints of the frame beams, side walls and a cubic manhole channel, wherein the side walls and the cubic manhole channel are integrated with surrounding piles, the underground rainwater storage tank main structure is designed and is specifically a hollow structure of the top plate, the side walls and a bottom plate, and the 'well' -shaped grid-shaped beam-column structure formed by crossing the frame beams and the frame columns in the underground rainwater storage tank, the hollow structure forms a sealed space which can be used for water storage of a regulation and storage pool in a water-facing area;
(g) backfilling a structural top plate, and recovering the ground:
and after the main structure of the storage tank is constructed and reaches the design requirement, backfilling a fresh soil body on the upper surface of the structure top plate to restore the ground to the state before slope excavation, constructing vegetation or public facilities, and completing the structural construction of the storage tank.
2. The method for constructing the storage pond based on the 'permanent-temporary integrated' inner support structure of the deep foundation pit according to claim 1, wherein the vertical supports in the pit are formed by a 'one-column-one-pile' structure form that steel columns are inserted into a column pile foundation; the upper steel upright is specifically a lattice column formed by welding 4 equal-edge angle steels and batten plates, and the lower upright pile foundation is a reinforced concrete bored pile foundation;
first way horizontal braces with the second way horizontal braces and the connected node of vertical support through the structure that the beam side haunches method at angle steel lattice column was accomplished, concrete structure is: the width of a beam at the node position of the beam column is enlarged in a beam side armoring way by a beam side armoring method, so that main ribs of the first horizontal support or the second horizontal support can pass through the side surface of the angle steel lattice column in a bypassing way;
the first horizontal bracing concurrently regards as the second floor frame roof beam of secret rainwater regulation pond major structure, the second says that the horizontal bracing concurrently regards as the third floor frame roof beam of secret rainwater regulation pond major structure, vertical support concurrently regards as the frame post of secret rainwater regulation pond major structure, the back cover concurrently regards as the bottom plate of secret rainwater regulation pond major structure.
3. The method for constructing the storage pond based on the 'permanent-temporary integrated' inner support structure of the deep foundation pit is characterized in that the first horizontal support and the second horizontal support are both grid-distributed reinforced concrete structures formed by intersecting a plurality of beams in longitudinal and transverse directions, each beam is formed by pouring concrete through a rectangular or square reinforcement cage, two ends of each beam are respectively connected with a reinforcement connector on the inner side wall of the enclosure pile, and the reinforcement cage of each beam and the reinforcement structure in the enclosure pile are bound and then are added with a template to be poured simultaneously to form an integrated pouring structure.
4. The method for constructing the storage pond based on the deep foundation pit 'permanent-faced integrated' inner support structure is characterized in that the vertical support is a vertical column structure formed by pouring concrete into a lattice column, the lattice column is a square column formed by welding four rows of angle steel bars section by section through a quadrilateral iron sheet ring, strip-shaped holes are formed in the middle of four sides of the lattice column and used for inserting steel bars and binding the steel bars, and the bottom end of the vertical support penetrates through the back cover and extends into a reinforced concrete bored pile foundation;
vertical support and reinforced concrete bored concrete pile basis structure of pouring as an organic whole, specific structure is: during the lattice column extends to the cylindrical steel reinforcement cage on reinforced concrete drilling bored concrete pile basis, passed the bar hole of lattice column in proper order through horizontally short reinforcement, short reinforcement both ends and cylindrical steel reinforcement cage ligature, short reinforcement middle part and lattice column ligature, the lattice column is tied up with cylindrical steel reinforcement cage and is gone down simultaneously to punching a hole, and concrete obtains vertical support lower part and the integrative casting structure of reinforced concrete drilling bored concrete pile basis at reinforced concrete drilling bored concrete pile basis oral area pouring concrete.
5. The method for constructing the storage pond based on the deep foundation pit 'permanent-faced integrated' inner support structure according to claim 1, wherein anti-cracking nets are lined on the outer surfaces of the pouring layers of the first horizontal support, the second horizontal support and the vertical support to prevent cement from falling off.
6. The regulating and storing pool construction method based on the deep foundation pit 'permanent-temporary integrated' inner support structure according to claim 1, wherein the specific structural details of the main structure of the underground rainwater regulating and storing pool obtained in the step (f) are described as follows: the device comprises a bottom plate arranged below a third layer of frame beam, a top plate arranged above a second layer of frame beam, side walls, frame beams and frame columns;
the underground main structure frame beam and the column of the storage tank are strictly designed according to the structural stress and deformation requirements; the horizontal and vertical inner support supporting system of the deep foundation pit of the storage tank is designed strictly according to the supporting requirements of the deep foundation pit; under the precondition that the number and the plane distribution position of a deep foundation pit horizontal and vertical inner support supporting system are not changed, and the foundation pit excavation mode, the material transportation and the earth and stone unearthing route are not changed, the stress and elevation distribution conditions of the deep foundation pit horizontal and vertical inner supports and the underground main body structure are enabled to be realized only by slightly adjusting the vertical position of the inner support on the premise that the foundation pit excavation safety is met, so that the horizontal and vertical inner supports of the deep foundation pit simultaneously bear the functions of the underground main body structure frame beam and column, and the integration of the deep foundation pit temporary supporting structure and the storage pond underground main body permanent structure is realized;
the side wall is of a cast-in-place concrete structure, and the outer wall of the side wall is tightly attached to the inner side wall of the fender post;
the bottom plate is the back cover, and the top plate is a cast-in-place plate structure formed by binding top steel bar beams with the top of the side steel bar cage frame of the side wall and the top end of the frame column, binding steel bar grids in grids formed by adjacent top steel bar beams and finally pouring cement mortar through a formwork.
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| CN114635430B (en) * | 2022-03-28 | 2023-12-26 | 广州一建建设集团有限公司 | Construction process for large-depth half-reverse excavation |
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