CN111236259A - Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof - Google Patents

Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof Download PDF

Info

Publication number
CN111236259A
CN111236259A CN202010170250.5A CN202010170250A CN111236259A CN 111236259 A CN111236259 A CN 111236259A CN 202010170250 A CN202010170250 A CN 202010170250A CN 111236259 A CN111236259 A CN 111236259A
Authority
CN
China
Prior art keywords
pile
row
walls
soil
supporting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010170250.5A
Other languages
Chinese (zh)
Inventor
韦永超
颜春
黄民源
谢明志
魏密
韦东勇
欧冬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanning Zongheng Times Construction Investment Co Ltd
Guangxi Transportation Research and Consulting Co Ltd
Original Assignee
Nanning Zongheng Times Construction Investment Co Ltd
Guangxi Transportation Research and Consulting Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanning Zongheng Times Construction Investment Co Ltd, Guangxi Transportation Research and Consulting Co Ltd filed Critical Nanning Zongheng Times Construction Investment Co Ltd
Priority to CN202010170250.5A priority Critical patent/CN111236259A/en
Publication of CN111236259A publication Critical patent/CN111236259A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B3/00Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • E02D17/207Securing of slopes or inclines with means incorporating sheet piles or piles
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02Protective 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 ground humidity or ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/20Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/24Prefabricated piles
    • E02D5/30Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/58Prestressed concrete piles

Abstract

The invention discloses a combined lattice-shaped prefabricated pile wall supporting structure which comprises a front row of pile walls, a rear row of pile walls, a middle pile wall, a platform plate and a counterfort retaining wall, wherein the front row of pile walls is provided with a front row of pile walls; the front row of pile walls and the rear row of pile walls are front and rear rows of parallel densely arranged prefabricated prestressed concrete hollow square piles, and the middle pile walls are a plurality of rows of densely arranged prefabricated prestressed concrete hollow square piles vertically positioned between the front row of pile walls and the rear row of pile walls; the hollow cavity of the precast prestressed concrete hollow square pile is internally provided with a cast-in-situ reinforced concrete core. Accordingly, the inventor also establishes a corresponding construction method. The invention overcomes the defect that the rigidity and the bearing capacity of the prefabricated support pile applied to the high side slope of the deep foundation pit are insufficient, provides a new solution for the foundation pit support without the requirements of support and anchor, and has the characteristics of short construction period, low cost and neat and beautiful structure surface. The water-stopping and soil-retaining supporting structure system is suitable for soft soil foundation pit engineering, brand-road side slope and wharf shore protection supporting engineering.

Description

Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof
Technical Field
The invention belongs to the technical field of supporting structures in geotechnical engineering, and particularly relates to a combined lattice-shaped prefabricated pile wall supporting structure and a construction method thereof.
Background
In order to solve the supporting problem of large deep foundation pit engineering without inner support requirement in soft soil area, the Chinese patent 'lattice underground wall self-supporting type retaining wall structure' (application No. 200510027744.3 published Japanese 2007-01-17) is characterized in that a plurality of T-shaped arranged and formed inner and outer underground diaphragm walls are correspondingly connected with a straight-line middle underground diaphragm wall one by one through perforated steel plates to form a lattice underground diaphragm wall with huge rigidity. The self-supporting type retaining wall structure utilizes the huge lateral rigidity of the lattice structure to resist the bending moment generated by the huge lateral water and soil pressure of a deep foundation pit and utilizes the soil body enclosed by the structure with larger plane size to form the supporting effect similar to a gravity type retaining wall, thereby overcoming the adverse effect of a pull-anchor type supporting structure on utilizing an underground space and the waste of resources caused by the temporary support of the inner support type supporting structure. However, in soft soil areas, the following problems exist when underground continuous walls are used for construction:
(1) in soft soil areas, the trench forming construction of the diaphragm wall is easy to collapse, extra trench wall reinforcement (usually adopting stirring piles and jet grouting piles) and slurry retaining walls and post slurry treatment are often needed, and the slurry retaining walls can cause groundwater pollution in the construction process, so that extra cost is high.
(2) Due to the reason of the groove forming mechanical construction process of the diaphragm wall, the width of the groove is generally not less than 2m, and the wall thickness is not less than 0.6m, so that the plane size of the lattice-shaped underground wall supporting structure formed by the diaphragm walls is large (the structure width is generally more than 6m), the flexibility of the combination mode is poor, and unnecessary waste is caused to a foundation pit with low required supporting rigidity.
(3) The main construction process of the diaphragm wall comprises the following steps: and after the ground is leveled, reinforcing the groove wall → constructing the guide wall and maintaining to the designed strength → grooving the underground wall → lowering the reinforcement cage and pouring the diaphragm wall under water → constructing the top crown beam of the wall to connect the underground walls to form a whole → maintaining to reach the designed strength, and then the foundation pit excavation can be carried out. Therefore, the diaphragm wall construction technology is complex, the construction efficiency is low, the required construction period is long, and the diaphragm wall is the support structure which is generally recognized to be the highest in construction cost at present.
The prestressed concrete hollow square pile is prefabricated and molded in a factory and is produced through high-pressure steam curing, streamlined production is realized, the production efficiency is high, building materials are saved, the pile forming quality is reliable, the strength of a unit material pile body is high (the concrete grade is C60-C80), the anti-cracking, anti-bending, anti-shearing, tensile and compression properties are excellent, the construction mechanization degree is high, the noise is low, the construction process is pollution-free, the construction efficiency is high, the construction period is short, the single-pile bearing capacity cost is lower than that of a conventional cast-in-place pile and an underground wall, the requirements of energy conservation, emission reduction, green construction and the like are met, and the prestressed concrete hollow square pile can be used in plug and play when being applied to foundation pit supporting of a soft soil foundation and side. But the method is limited by the reasons of convenient production, transportation and construction conditions, the prefabricated prestressed concrete hollow square pile is short in length (the general length is not more than 15m), small in section size (the side length is 400-800 mm), and low in bending resistance and shearing resistance of a single pile, so that an inner support or anchor pulling structure is generally required to be arranged when the prefabricated prestressed concrete hollow square pile is applied to a deep foundation pit supporting retaining wall, and the prefabricated prestressed concrete hollow square pile cannot be applied to deep foundation pit engineering with large foundation pit depth and without support and anchor requirements.
Disclosure of Invention
The invention aims to solve the technical problem of providing a combined lattice-shaped prefabricated pile wall supporting structure which is quick in construction, short in construction period, low in cost, neat and attractive in structure surface, excellent in performance, flexible in combination, free of support and anchor and a construction method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the combined lattice-shaped prefabricated pile wall supporting structure comprises a front row of pile walls, a rear row of pile walls, a middle pile wall, a platform plate and a counterfort retaining wall; the front row of pile walls and the rear row of pile walls are front and rear rows of parallel densely arranged prefabricated prestressed concrete hollow square piles, and the middle pile walls are a plurality of rows of densely arranged prefabricated prestressed concrete hollow square piles vertically positioned between the front row of pile walls and the rear row of pile walls; a cast-in-situ reinforced concrete filling core is arranged in a cavity of the prefabricated prestressed concrete hollow square pile; the platform plate is a cast-in-situ reinforced concrete structure consisting of a front row pile wall crown beam, a rear row pile wall crown beam, a middle pile wall crown beam and an inter-beam plate; the front row pile wall, the rear row pile wall and the middle pile wall are fixedly connected into an integral structure by anchoring into the platform plate; the counterfort retaining wall is a cast-in-situ reinforced concrete retaining component fixedly connected on the platform plate.
The pile length of the prefabricated prestressed concrete hollow square pile is 5m-15m, and the side length is 0.4m-0.8 m; the row spacing of the front row pile wall and the rear row pile wall is 3.0-10.0 times of the side length of the used square pile, and the row spacing of the middle pile wall is 3.0-08 times of the side length of the used square pile; the length of the middle pile wall is not more than that of the front row pile wall.
2-4 symmetrical surfaces of the prefabricated prestressed concrete hollow square pile are respectively provided with 2 symmetrical arc-shaped grooves, 4 grooves which correspond to the joint surfaces of two adjacent prefabricated prestressed concrete hollow square piles one by one are combined side by side to form 2 grouting water stop holes, and the grouting water stop holes are filled with cement slurry and inserted with ribbed steel bars.
The length of the reinforced concrete core is 2.0m-1.0 times of the pile length of the prefabricated prestressed concrete hollow square pile.
The beam width of the front row of pile wall top beams, the rear row of pile wall top beams and the middle pile wall top beams is 300mm greater than the length and width of the edge of the prefabricated pile, and the height of the top beams is 0.8-1.5 times of the length of the edge of the pile; the buttress retaining wall consists of retaining plates with the thickness of 0.2-0.6m and buttress ribs with the thickness of 0.2-0.6m, wherein the buttress ribs correspond to the middle pile walls one by one, and the buttress ribs are in a trapezoid shape or a triangular shape with a small upper part and a large lower part.
The construction method of the combined lattice-shaped prefabricated pile wall supporting structure comprises the following steps:
<1> preparation of construction: surveying and relocating underground pipelines and structures according to a site and the surrounding environment thereof, calculating all parameters required by a combined prefabricated supporting pile wall supporting structure according to the geological conditions and the surrounding environment of foundation pit engineering, side slope support or river wharf revetment, drawing a design drawing, leveling the site according to the design drawing, putting a slope to excavate a shallow foundation pit or adopting a temporary steel sheet pile support to excavate the shallow foundation pit to the designed pile top elevation, wherein the depth of the shallow foundation pit is 1.0-5.0 m;
and 2, pile wall construction: the back row pile wall, the middle pile wall and the front row pile wall are constructed in sequence, and the construction is carried out according to the following steps: at the bottom of a shallow foundation pit, vertically sinking the pile wall into the ground by using a hammering method, a static pressure method or a pile planting method according to the pile position of each prefabricated prestressed concrete hollow square pile of the pile wall determined by a design drawing and field measurement, and sinking the pile by using a middle digging method or a hole leading method for assisting in matching with pile sinking;
and <3> construction of grouting body and ribbed steel bars: after the pile sinking of the back row pile wall, the middle pile wall and the front row pile wall is finished to form the lattice-shaped underground continuous pile wall, cement grout is filled in a grouting water stop hole formed by the grooves adjacent to the joint surfaces of the two piles, and then ribbed steel bars with the diameter of 1.5-1.9 times the depth of the grooves are inserted before the cement grout is solidified to be occluded to form the underground continuous wall type lattice-shaped pile wall capable of stopping water and retaining soil; the length of the ribbed steel bar is 1.0 time of the pile length, and the ribbed steel bar needs to be reserved 35 times of the diameter of the steel bar and is anchored into the platform plate by being higher than the pile top;
and 4, core filling concrete and platform slab construction: inserting a reinforcement cage with the length of 2.0m-1.0 times of the pile length into the cavity of the prefabricated prestressed hollow square pile, and reserving a reinforcement with the diameter 35 times of that of the reinforcement, and anchoring the reinforcement cage into a platform plate by being higher than the pile top; binding a steel bar framework of a platform plate on site, reserving counterfort retaining wall vertical steel bars, erecting a template, integrally pouring core filling concrete and platform plate concrete, anchoring the front row pile wall, the rear row pile wall and the middle pile wall into the platform plate by 100-200 mm, and anchoring the core filling concrete and ribbed steel bars into the platform plate to form an integral structure, so that the lattice underground continuous pile walls are fixedly connected to form an integral type retaining wall structure;
<5> buttress barricade construction: binding a counterfort retaining wall steel reinforcement framework, erecting a template, and pouring counterfort retaining wall concrete to be fixedly connected to the platform plate to form a combined lattice-shaped prefabricated pile wall supporting structure;
and 6, reinforcing construction of a reinforced soil body: at the bottom of the shallow foundation pit, reinforcing the soil body at the bottom slope of the pit before the pile by adopting a jet grouting pile or a mixing pile or a stratum grouting method to form a reinforced soil body;
<7> soil filling body construction: after the concrete of the platform plate and the counterfort retaining wall reaches 85% of the designed strength, filling soil to the designed ground elevation after the upper wall of the beam plate platform is backfilled by adopting plain soil or sandy soil or soil bagged soil to form a soil filling body;
<8> excavation of foundation pit: and after the strength of the reinforced soil body reaches the design requirement, excavating and removing the soil body above the elevation of the designed pit bottom/slope bottom before the pile.
The depth of the front row of pile walls and the rear row of pile walls below the bottom (slope bottom/river bottom) of the foundation pit is not less than 0.6 time of the depth/slope height of the foundation pit, and the depth of the middle pile walls below the bottom of the foundation pit is less than the embedding depth of the front row of pile walls and the rear row of pile walls and is not less than 2 m; the platform plate is 1.0-5.0m lower than the current situation or the design ground, the plate thickness is 150mm-400mm, the height of the retaining plate of the buttress retaining wall is flush with the ground or is not higher than 1.2m higher than the design ground, and the height of the buttress rib of the buttress retaining wall is flush with the design ground or is 0.2-1.0m lower than the design ground.
Aiming at the problems existing in the application of the grid-shaped diaphragm wall supporting structure in the soft soil area at present, the inventor designs a combined grid-shaped prefabricated pile wall supporting structure which comprises a front row of pile walls, a rear row of pile walls, a middle pile wall, a platform plate and a counterfort retaining wall; the front row of pile walls and the rear row of pile walls are front and rear rows of parallel densely arranged prefabricated prestressed concrete hollow square piles, and the middle pile walls are a plurality of rows of densely arranged prefabricated prestressed concrete hollow square piles vertically positioned between the front row of pile walls and the rear row of pile walls; the hollow cavity of the precast prestressed concrete hollow square pile is internally provided with a cast-in-situ reinforced concrete core. The front row pile wall, the rear row pile wall and the middle pile wall form an underground continuous pile wall with a lattice-shaped plane. Accordingly, the inventor also establishes a corresponding construction method. The supporting structure has the advantages of strong bending resistance and shearing resistance, good overturn resistance, good sliding resistance and good overall stability, and can be flexibly combined to form a supporting structure with higher rigidity and bearing capacity, the defect that the rigidity and the bearing capacity of the prefabricated supporting pile are insufficient when the prefabricated supporting pile is applied to a high side slope of a deep foundation pit is solved, a new solution capable of being quickly constructed is provided for foundation pit supporting without supporting and anchoring requirements, and the supporting structure has the characteristics of construction period saving, cost saving and neat and attractive structure surface. The water-stopping and soil-retaining supporting structure system is suitable for soft soil foundation pit engineering, brand-road side slope and wharf shore protection supporting engineering.
Compared with the prior art, the invention has the outstanding advantages that:
(1) the supporting structure provided by the invention realizes that the prefabricated hollow square piles with limited pile length and smaller rigidity and bearing capacity are combined to form a support-free anchor-free supporting structure with larger lateral bending rigidity, stronger shearing bearing capacity, resistance to overturn, resistance to sliding, good overall stability and excellent soil-retaining and water-stopping performance, overcomes the problem that the single-row and double-row prefabricated piles with smaller rigidity and bearing capacity are applied to a soft soil area without an inner support and require insufficient deep foundation pit engineering bearing capacity, provides a novel freely-combined and fast-constructed supporting structure for soft soil foundation pit engineering with smaller required rigidity than a latticed underground wall, overcomes the defect of insufficient flexibility of latticed underground wall combination, and meets the requirements of dry and safe construction environments of foundation pit engineering with different stress requirements and different supporting rigidity requirements.
(2) The supporting pile adopted by the invention is a prestressed concrete hollow square pile prefabricated and maintained in a factory, the production process is green and environment-friendly, the pile forming quality is reliable, the surface of the supporting structure is smooth, the environmental pollution possibly caused by the fact that the mud retaining wall and the groove wall are required to be reinforced in the construction of a soft soil area of the traditional lattice-shaped underground continuous wall is overcome, and the working procedure that the surface of the underground continuous wall is uneven and needs to be leveled is overcome, the supporting structure has high construction efficiency, the construction period can be greatly shortened, and the engineering cost is reduced.
(3) The supporting structure reduces the elevation of the top of the prefabricated pile, reduces the pile length of the prefabricated supporting pile, enlarges the application range of the prefabricated pile with the limited pile length in the retaining structure engineering of the deep foundation pit high slope, can combine the front soil of the pile for reinforcement in the deep foundation pit engineering in the deep soft soil area, can effectively limit the horizontal deformation of the supporting structure, and meets the requirements of foundation pit construction and the surrounding environment protection.
Drawings
Fig. 1 is a schematic plan view of a modular lattice-structured precast piling wall supporting structure according to the present invention.
Fig. 2 is a schematic elevation view of the modular lattice-structured precast piling wall supporting structure of the present invention.
Fig. 3 is a partial perspective view of a vertical portion of a middle pile wall and front/rear row pile walls in the modular lattice-structured prefabricated pile wall supporting structure of the present invention.
In the figure: 1 front row pile wall, 2 rear row pile wall, 3 middle pile wall, 4 platform plate, 5 buttress retaining wall, 6 prefabricated prestressed hollow square pile, 7 hollow cavity, 8 core filling concrete, 9 grouting water stop hole, 10 grouting body, 11 ribbed steel bar, 10 rigid frame beam, 11 platform plate, 12 reinforced soil body, 13 soil filling body, 14 pile back soil, 15 pile-to-pile soil, 16 pile front soil, 42 rear row pile wall crown beam, 41 front row pile crown beam, 43 middle pile wall crown beam and 44 beam-to-beam plate,
Detailed Description
A, basic structure
A combined lattice-shaped prefabricated pile wall supporting structure comprises a front row of pile walls, a rear row of pile walls, a middle pile wall, a platform plate and a counterfort retaining wall.
The front row pile wall and the rear row pile wall are front and rear rows of parallel close-packed prefabricated prestressed concrete hollow square piles (densely arranged), the middle pile wall is a plurality of rows of close-packed prefabricated prestressed concrete hollow square piles vertically positioned between the front row pile wall and the rear row pile wall, the row spacing (clear spacing) of the front row pile wall and the rear row pile wall is 3.0-10.0 times of the side length of the square piles, the length of the middle pile wall is not more than that of the front row pile wall, and the row spacing (clear spacing) of the middle pile wall is 3.0-8.0 times of the side length of the square piles; a cast-in-situ reinforced concrete filling core is arranged in a cavity of the prefabricated prestressed concrete hollow square pile, and the length of the reinforced concrete filling core is 1m-1.0 time of the pile length of the prefabricated prestressed concrete hollow square pile;
the pile length of the prefabricated prestressed concrete hollow square pile is 5m-15m, and the side length is 0.4m-0.8 m; 2-4 symmetrical surfaces of the square pile are respectively provided with 2 symmetrical arc-shaped grooves, 4 grooves which correspond to the joint surfaces of two adjacent hollow square piles of the prefabricated prestressed concrete side by side form 2 grouting and water stopping holes, the grouting and water stopping holes are filled with cement slurry to be solidified to form grouting bodies, and ribbed steel bars are inserted before the cement slurry is solidified to be in occlusion connection to form the underground continuous pile wall capable of stopping water and retaining soil.
The platform plate is a cast-in-situ reinforced concrete structure consisting of a front row pile wall crown beam, a rear row pile wall crown beam, a middle pile wall crown beam and an inter-beam plate; the front row pile wall, the rear row pile wall and the middle pile wall are fixedly connected into an integral structure by anchoring into the platform plate; the counterfort retaining wall is a cast-in-situ reinforced concrete retaining member which is fixedly connected on the platform plate and consists of a retaining plate and counterfort ribs. The beam width of the front row pile wall top beam, the rear row pile wall top beam or the middle pile wall top beam is 300mm more than the length and width of the edge of the precast pile, and the height of the top beam is 0.8-1.5 times of the side length of the square pile; the thickness of the retaining plate of the buttress retainer is 0.2mm-0.6m, the thickness of the buttress rib of the buttress retaining wall is 0.2-0.6m, the buttress ribs correspond to the middle pile walls one by one, and the buttress ribs are in a trapezoid shape or a triangle shape with a small upper part and a large lower part.
Second, construction method
<1> preparation of construction: surveying and relocating underground pipelines and structures according to the site and the surrounding conditions thereof, calculating all parameters required by a combined prefabricated supporting pile wall supporting structure according to the geological conditions and the surrounding environment of foundation pit engineering, side slope support or river wharf revetment, drawing a design drawing, leveling the site according to the design drawing, placing a slope to excavate a shallow foundation pit or adopting a temporary steel sheet pile support to excavate the shallow foundation pit to the designed pile top elevation, wherein the depth of the shallow foundation pit is 1.0-5.0 m;
and 2, pile wall construction:
and (3) constructing a rear row pile wall: in order to avoid the soil squeezing effect of the pile wall in the rear row from influencing the regularity of the pile wall in the front row after construction, the pile wall (the prefabricated prestressed hollow square pile) is vertically sunk into the ground by using a hammering method, a static pressure method or a pile planting method according to the design drawing and the pile position of each prefabricated prestressed hollow square pile of the pile wall determined by field measurement at the bottom of a shallow foundation pit, and a middle digging method or a hole leading method can be adopted for assisting in the pile sinking so as to ensure the verticality, the regularity and the fitting degree;
constructing a middle pile wall: at the bottom of a shallow foundation pit, vertically sinking the pile wall into the ground by using a hammering method, a static pressure method or a pile planting method according to the pile position of each prefabricated prestressed hollow square pile of the pile wall determined by a design drawing and field measurement, and assisting in pile sinking by adopting a middle digging method or a hole leading method during pile sinking so as to ensure the verticality, the alignment and the fitting degree;
construction of a front row pile wall: at the bottom of a shallow foundation pit, vertically sinking the pile wall into the ground by using a hammering method, a static pressure method or a pile planting method according to the pile position of each prefabricated prestressed hollow square pile of the pile wall determined by a design drawing and field measurement, and assisting in pile sinking by adopting a middle digging method or a hole leading method during pile sinking so as to ensure the verticality, the alignment and the fitting degree;
and <3> construction of grouting body and ribbed steel bars: after the pile sinking of the back row pile wall, the middle pile wall and the front row pile wall is finished to form the lattice-shaped underground continuous pile wall, in order to strengthen the connectivity and water stopping performance of the back row pile wall, the middle pile wall and the front row pile wall, cement slurry is filled in a grouting water stopping hole formed by the grooves close to the joint surfaces of the two piles, and then ribbed steel bars with the diameter of 1.5 to 1.9 times the depth of the grooves are inserted before the cement slurry is solidified into grouting body to be occluded to form the underground continuous wall type lattice-shaped pile wall capable of stopping water and retaining soil; the length of the ribbed steel bar is 1 time of the length of the pile, and the ribbed steel bar needs to be reserved 35 times of the diameter of the steel bar and is anchored into the platform plate by being higher than the pile top;
and 4, core filling concrete and platform slab construction: in order to further enhance the integrity and structural rigidity of the underground continuous lattice-shaped prefabricated pile wall, a reinforcement cage with the length of 2.0m-1.0 times of the pile length is inserted into the cavity of the prefabricated prestressed hollow square pile, and a platform plate which is anchored above the pile top and has the diameter of 35 times of the reinforcement is reserved; binding a steel reinforcement framework of the platform plate on site, reserving counterfort retaining wall vertical steel bars, erecting a template, and integrally pouring core filling concrete and platform plate concrete to fixedly connect the lattice underground continuous pile wall to form an integral retaining wall structure;
<5> buttress barricade construction: binding a counterfort retaining wall steel reinforcement framework, erecting a template, and pouring counterfort retaining wall concrete to be fixedly connected to the platform plate to form a combined lattice-shaped prefabricated pile wall supporting structure;
and 6, reinforcing construction of a reinforced soil body: at the bottom of the shallow foundation pit, reinforcing the soil body at the bottom slope of the pit before the pile by adopting a jet grouting pile or a mixing pile or a stratum grouting method to form a reinforced soil body;
<7> soil filling body construction: after the concrete of the platform plate and the counterfort retaining wall reaches 85% of the designed strength, filling soil to the designed ground elevation after the upper wall of the beam plate platform is backfilled by adopting plain soil or sandy soil or soil bagged soil to form a soil filling body;
<8> excavation of foundation pit: and after the strength of the reinforced soil body reaches the design requirement, excavating and removing the soil body above the elevation of the pit bottom slope in front of the pile.
During design and construction, the depth of the front row of pile walls and the rear row of pile walls embedded below the bottom of the foundation pit is not less than 0.6 time of the depth of the foundation pit, and the depth of the middle pile walls embedded below the bottom of the foundation pit can be less than the embedding depth of the front row of pile walls and the rear row of pile walls and is not less than 2 m; the platform plate is 1.0-5.0m lower than the current situation or the design ground, the plate thickness is 150mm-400mm, the height of the retaining plate of the buttress retaining wall is flush with the ground or is not higher than 1.2m higher than the design ground, and the height of the buttress rib of the buttress retaining wall is flush with the design ground or is 0.2-1.0m lower than the design ground.

Claims (7)

1. A combined lattice-shaped prefabricated pile wall supporting structure comprises a front row of pile walls, a rear row of pile walls, a middle pile wall, a platform plate and a counterfort retaining wall; the method is characterized in that: the front row of pile walls and the rear row of pile walls are front and rear rows of parallel densely-arranged prefabricated prestressed concrete hollow square piles, and the middle pile walls are a plurality of rows of densely-arranged prefabricated prestressed concrete hollow square piles vertically positioned between the front row of pile walls and the rear row of pile walls; a cast-in-situ reinforced concrete filling core is arranged in the cavity of the precast prestressed concrete hollow square pile; the platform plate is a cast-in-situ reinforced concrete structure platform consisting of a front row pile wall crown beam, a rear row pile wall crown beam, a middle pile wall crown beam and an inter-beam plate; the front row pile wall, the rear row pile wall and the middle pile wall are fixedly connected into an integral structure by anchoring into the platform plate; the counterfort retaining wall is a cast-in-situ reinforced concrete retaining component fixedly connected on the platform plate.
2. The modular lattice-structured precast piling wall supporting structure according to claim 1, wherein: the pile length of the precast prestressed concrete hollow square pile is 5m-15m, and the side length is 0.4m-0.8 m; the row spacing of the front row pile wall and the rear row pile wall is 3.0-10.0 times of the side length of the used square pile, and the row spacing of the middle pile wall is 3.0-8.0 times of the side length of the used square pile; the length of the middle pile wall is not more than that of the front row pile wall.
3. The modular lattice-structured precast piling wall supporting structure according to claim 1, wherein: 2-4 symmetrical surfaces of the prefabricated prestressed concrete hollow square pile are respectively provided with 2 symmetrical arc-shaped grooves, 4 grooves corresponding to the joint surfaces of two adjacent prefabricated prestressed concrete hollow square piles one by one are combined to form 2 grouting water stop holes, and the grouting water stop holes are filled with cement slurry and inserted with ribbed steel bars.
4. The modular lattice-structured precast piling wall supporting structure according to claim 1, wherein: the length of the reinforced concrete core is 2.0m-1.0 times of the pile length of the prefabricated prestressed concrete hollow square pile.
5. The modular lattice-structured precast piling wall supporting structure according to claim 1, wherein: the beam width of the front row of pile wall top beams, the rear row of pile wall top beams and the middle pile wall top beams is 300mm greater than the length and width of the edge of the prefabricated pile, and the height of the top beams is 0.8-1.5 times of the length of the edge of the pile; the buttress is composed of retaining plates with the thickness of 0.2-0.6m and buttress ribs with the thickness of 0.2-0.6m, the buttress ribs correspond to the middle pile walls one by one, and the buttress ribs are in a trapezoid shape or a triangular shape with a small upper part and a large lower part.
6. The construction method of the combined lattice-type precast piling wall supporting structure of claim 1, comprising the steps of:
<1> preparation of construction: surveying and relocating underground pipelines and structures according to a site and the surrounding environment thereof, calculating all parameters required by a combined prefabricated supporting pile wall supporting structure according to the geological conditions and the surrounding environment of foundation pit engineering, side slope support or river wharf revetment, drawing a design drawing, leveling the site according to the design drawing, putting a slope to excavate a shallow foundation pit or adopting a temporary steel sheet pile support to excavate the shallow foundation pit to the designed pile top elevation, wherein the depth of the shallow foundation pit is 1.0-5.0 m;
and 2, pile wall construction: the back row pile wall, the middle pile wall and the front row pile wall are constructed in sequence, and the construction is carried out according to the following steps: at the bottom of a shallow foundation pit, vertically sinking the pile wall into the ground by using a hammering method, a static pressure method or a pile planting method according to the pile position of each prefabricated prestressed concrete hollow square pile of the pile wall determined by a design drawing and field measurement, and sinking the pile by using a middle digging method or a hole leading method for assisting in matching with pile sinking;
and <3> construction of grouting body and ribbed steel bars: after the pile sinking of the back row pile wall, the middle pile wall and the front row pile wall is finished to form the lattice-shaped underground continuous pile wall, cement grout is filled in a grouting water stop hole formed by the grooves adjacent to the joint surfaces of the two piles, and then ribbed steel bars with the diameter of 1.5-1.9 times the depth of the grooves are inserted before the cement grout is solidified to be occluded to form the underground continuous wall type lattice-shaped pile wall capable of stopping water and retaining soil; the length of the ribbed steel bar is 1.0 time of the pile length, and 35 times of the diameter of the steel bar is reserved to be higher than the pile top and anchored into the platform plate;
and 4, core filling concrete and platform slab construction: inserting a reinforcement cage with the length of 2.0m-1.0 times of the pile length into the cavity of the prefabricated prestressed hollow square pile, and reserving a reinforcement with the diameter 35 times of that of the reinforcement, and anchoring the reinforcement cage into a platform plate by being higher than the pile top; binding a steel reinforcement framework of the platform plate on site, reserving counterfort retaining wall vertical steel bars, erecting a template, and integrally pouring core filling concrete and platform plate concrete to fixedly connect the lattice underground continuous pile wall to form an integral retaining wall structure;
<5> buttress barricade construction: binding a counterfort retaining wall steel reinforcement framework, erecting a template, and pouring counterfort retaining wall concrete to be fixedly connected to the platform plate to form a combined lattice-shaped prefabricated pile wall supporting structure;
and 6, reinforcing construction of a reinforced soil body: at the bottom of the shallow foundation pit, reinforcing the soil body at the bottom slope of the pit before the pile by adopting a jet grouting pile or a mixing pile or a stratum grouting method to form a reinforced soil body;
<7> soil filling body construction: after the concrete of the platform plate and the counterfort retaining wall reaches 85% of the designed strength, filling soil to the designed ground elevation after the upper wall of the beam plate platform is backfilled by adopting plain soil or sandy soil or soil bagged soil to form a soil filling body;
<8> excavation of foundation pit: and after the strength of the reinforced soil body reaches the design requirement, excavating and removing the soil body above the elevation of the pit bottom slope in front of the pile.
7. The construction method according to claim 5, wherein: the depth of the front row of pile walls and the rear row of pile walls embedded below the bottom of the foundation pit is not less than 0.6 time of the depth of the foundation pit, and the depth of the middle pile walls embedded below the bottom of the foundation pit is less than the embedding depth of the front row of pile walls and the rear row of pile walls and is not less than 2 m; the platform plate is 1.0-5.0m lower than the current situation or the design ground, the plate thickness is 150mm-400mm, the height of the retaining plate of the buttress retaining wall is flush with the ground or is not higher than 1.2m higher than the design ground, and the height of the buttress rib of the buttress retaining wall is flush with the design ground or is 0.2-1.0m lower than the design ground.
CN202010170250.5A 2020-03-12 2020-03-12 Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof Pending CN111236259A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010170250.5A CN111236259A (en) 2020-03-12 2020-03-12 Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010170250.5A CN111236259A (en) 2020-03-12 2020-03-12 Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof

Publications (1)

Publication Number Publication Date
CN111236259A true CN111236259A (en) 2020-06-05

Family

ID=70870600

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010170250.5A Pending CN111236259A (en) 2020-03-12 2020-03-12 Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof

Country Status (1)

Country Link
CN (1) CN111236259A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113006084A (en) * 2021-03-08 2021-06-22 中铁十一局集团有限公司 Construction method and dynamic design method of support-free foundation pit supporting system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040237435A1 (en) * 2003-06-02 2004-12-02 Yurkevich Engineering Bureau Ltd. Reinforced-concrete column in the soil pit and method of its construction
CN203729308U (en) * 2014-01-24 2014-07-23 中国建筑股份有限公司 Double-row pile supporting system of reinforced concrete pile combined structural steel cement mixing pile wall
CN203768912U (en) * 2014-03-13 2014-08-13 南京工业大学 Double-row prestressing high-strength concrete rectangular pile foundation pit supporting structure
CN105544531A (en) * 2016-01-25 2016-05-04 李文明 Prestressed high-strength concrete hollow support pile and manufacturing method thereof
CN108277814A (en) * 2018-04-11 2018-07-13 王凯 Stake top counterfort wall supporting construction and construction method
CN109505299A (en) * 2018-12-28 2019-03-22 广州市建筑科学研究院新技术开发中心有限公司 Recoverable version Retaining Structure with Double-row Piles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040237435A1 (en) * 2003-06-02 2004-12-02 Yurkevich Engineering Bureau Ltd. Reinforced-concrete column in the soil pit and method of its construction
CN203729308U (en) * 2014-01-24 2014-07-23 中国建筑股份有限公司 Double-row pile supporting system of reinforced concrete pile combined structural steel cement mixing pile wall
CN203768912U (en) * 2014-03-13 2014-08-13 南京工业大学 Double-row prestressing high-strength concrete rectangular pile foundation pit supporting structure
CN105544531A (en) * 2016-01-25 2016-05-04 李文明 Prestressed high-strength concrete hollow support pile and manufacturing method thereof
CN108277814A (en) * 2018-04-11 2018-07-13 王凯 Stake top counterfort wall supporting construction and construction method
CN109505299A (en) * 2018-12-28 2019-03-22 广州市建筑科学研究院新技术开发中心有限公司 Recoverable version Retaining Structure with Double-row Piles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113006084A (en) * 2021-03-08 2021-06-22 中铁十一局集团有限公司 Construction method and dynamic design method of support-free foundation pit supporting system

Similar Documents

Publication Publication Date Title
CN105155551A (en) Pressure compensation type foundation pit supporting structure and construction method
CN111236258A (en) Prefabricated pile wall supporting structure with stiffening rib wall and unloading platform and construction method thereof
CN110777806B (en) Multi-connecting-rod plane frame permanent supporting structure and construction process thereof
CN105040707A (en) Combined densely-arrayed pile deep foundation pit supporting and enclosure structure used as basement external wall
CN111236259A (en) Combined lattice-shaped prefabricated pile wall supporting structure and construction method thereof
CN111236260A (en) Variable-rigidity combined type prefabricated double-row pile supporting structure and construction method thereof
CN112942377A (en) Novel support shear-resistant structure and construction method thereof
CN109653193B (en) Reverse construction method for underground continuous wall
CN110565666A (en) Construction method of flat combined sheet pile ground connecting wall type water retaining cofferdam
CN110685287A (en) Double-row pile foundation pit supporting system with drainage ditch and retaining wall and construction method
CN210887256U (en) Straight combined sheet pile-ground wall-connecting type frame of water retaining cofferdam
CN213448531U (en) A river course cofferdam structure for ground wall protection
CN213143117U (en) Assembled keyway basis retaining wall structure
CN215441921U (en) Novel support shear structure
CN213448541U (en) Arch bridge foundation of limestone foundation under deep round gravel layer
CN214143525U (en) Embankment ballast
CN110258621B (en) Assembled retaining wall convenient to quick construction
CN211523179U (en) Subway station faces integration envelope forever
CN111733830B (en) Super high-rise building foundation pit bearing and enclosing system
CN216194772U (en) Foundation pit supporting and water stopping system
CN210086322U (en) Anti-floating underground garage in water-rich area
CN111778962B (en) Construction method of partially-empty underground continuous wall
CN212388582U (en) Assembled open caisson structure
CN211006701U (en) Foundation pit supporting structure integrating pile and wall
CN216787169U (zh) 一种竖向锚索牛腿式桩板墙支护结构

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination