CN112962585A - Curtain method retaining wall cast-in-place pile construction method - Google Patents
Curtain method retaining wall cast-in-place pile construction method Download PDFInfo
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- CN112962585A CN112962585A CN202110088206.4A CN202110088206A CN112962585A CN 112962585 A CN112962585 A CN 112962585A CN 202110088206 A CN202110088206 A CN 202110088206A CN 112962585 A CN112962585 A CN 112962585A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/40—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0075—Textiles
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- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a curtain method retaining wall cast-in-place pile construction method, which comprises the following steps: (1) surface treatment and embedding of a pile casing, (2) slurry preparation, (3) drilling and grouting, (4) steel reinforcement cage manufacturing, (5) curtain installation, (6) steel reinforcement cage lowering, (7) hole cleaning, and (8) concrete pouring. The invention is improved on the basis of the traditional construction process of the slurry retaining wall pore-forming cast-in-place pile, the high-strength curtain is additionally arranged on the periphery of the steel reinforcement cage, and the curtain is brought into the pile hole in the process of lowering the steel reinforcement cage, so that the phenomena of hole wall shrinkage, collapse and the like in the hole cleaning process can be prevented, the concrete in the pile hole can be effectively prevented from being poured into a silt layer, and the over-square of the concrete is reduced.
Description
Technical Field
The invention belongs to the field of pile foundation construction, and mainly relates to a curtain-method dado cast-in-place pile construction method.
Background
A large number of sludge stratums are distributed in coastal areas and part of inland ancient river siltation areas in China, the sludge stratums are low in strength, small in water permeability, high in natural water content, low in dry density and high in compressibility, are usually in a flowing state, are uneven in thickness, vary in local thickness from one meter to tens of meters, and are mainly distributed on the surface layer and several meters below the surface of the ground. With the development of urban economy in China, a large number of infrastructures such as building plates, road bridges, subway stations and the like are necessarily built on the sludge layers. Under the construction of silt geological conditions, the disposal of the silt is often very difficult. The design mostly adopts the large-diameter pile foundation to penetrate through the silt stratum, and the building load is transferred to the solid stratum.
The traditional slurry dado pore-forming cast-in-situ bored pile construction has strong fluidity due to low stratum strength and large water content of sludge, and the volume weight of the sludge is low and is about 1.2 to 1.5. In the concrete pouring process, the hole wall of the sludge layer can not resist the pouring pressure of the concrete, so that the concrete is directly poured into the sludge layer, and the concrete seriously exceeds the ground; and secondary hole cleaning quality is difficult to guarantee, the consistency of slurry is reduced after hole cleaning, the wall protection effect is reduced, sludge hole walls are dissolved and softened, the hole walls are necked down and collapsed, coarse particles in sludge sink, so that the sediment at the bottom of the pile is difficult to clean, concrete poured into a sludge layer and the pile form a whole, and the redundant concrete can stably suspend in the sludge layer by the support of a pile foundation, so that the redundant concrete increases the dead weight of a pile body and has adverse effect on the stress of the pile.
Disclosure of Invention
In view of the above, the invention provides a curtain-method wall-protecting cast-in-place pile construction method, which is characterized in that a high-strength curtain is wrapped on the periphery of a reinforcement cage and placed in a pile hole to protect the wall of a sludge layer, so that concrete is prevented from being poured into the sludge layer, and the over-square of the concrete is effectively reduced.
In order to achieve the purpose, the curtain method retaining wall cast-in-place pile construction method provided by the invention comprises the following steps of:
the method comprises the following steps: surface treatment and embedding of pile casings: leveling and reinforcing the ground surface, and then embedding a pile casing in the ground surface;
step two: preparing slurry: excavating a mud pit beside the pile position to prepare PHP mud;
step three: drilling and grouting: driving a pile protector around the pile protector embedded in the first step, aligning the center of a drill bit of the drilling machine with the center of the pile protector, and injecting prepared slurry in the drilling process;
step four: manufacturing a steel reinforcement cage: overlapping all the steel bars, and welding the steel bars into a steel bar cage;
step five: mounting a curtain: wrapping a curtain around the periphery of the steel reinforcement cage;
step six: and (4) placing a reinforcement cage: lowering the manufactured reinforcement cage and the manufactured curtain to the specified pile hole depth;
step seven: hole cleaning: cleaning the sediment at the bottom of the pile hole, detecting the environment in the pile hole, and carrying out the next step when the environment meets the standard;
step eight: pouring concrete: and pouring underwater concrete into the pile hole.
The curtain-method wall-protecting cast-in-place pile construction method is improved on the basis of the traditional slurry wall-protecting pore-forming cast-in-place pile construction process, the high-strength curtain is additionally arranged on the periphery of the reinforcement cage, and the curtain is brought into the pile hole in the process of lowering the reinforcement cage, so that the phenomena of hole wall shrinkage, collapse and the like in the hole cleaning process can be prevented, the concrete in the pile hole can be effectively prevented from being poured into a silt layer, the over-square of the concrete is reduced, and the construction cost is saved.
And furthermore, in the fourth step, a group of concrete protective layer cushion blocks are arranged every 2m along the longitudinal length of the steel reinforcement cage, each group of the concrete protective layer cushion blocks comprises 6-8 concrete protective layer cushion blocks, and the concrete protective layer cushion blocks of the same group are located on the same section and are symmetrically arranged along the circumferential direction of the steel reinforcement cage. Arrange a plurality of cushion around the steel reinforcement cage, the position of fixed steel reinforcement cage prevents effectively that the steel reinforcement cage from being absorbed in silt, ensures that the steel reinforcement cage is located pile body center to slow down the corruption infiltration of underground environment to the steel reinforcement cage.
Preferably, in the fifth step, the curtain is fixedly connected with the reinforcement protection layer cushion block through a non-metallic material. The curtain and the cushion block are connected and fixed by adopting other materials or methods except metal, so that the situation that a channel is formed between a steel bar in the pile and the ground layer to cause electrolytic corrosion of the steel bar is prevented.
Preferably, in step five, the tensile strength of the curtain is determined according to the concrete pouring pressure, the diameter of the pile hole and the effective thickness of the selected curtain, and the tensile strength of the curtain can be calculated by the following calculation formula:
Pw≥PL/2h
wherein: pw: tensile strength of the curtain;
p: concrete pouring pressure intensity;
l: pile hole diameter;
h: the effective thickness of the curtain.
Preferably, in the seventh step, the detecting the environment in the pile comprises detecting the hole depth, the sediment thickness at the bottom of the hole, the mud specific gravity and the mud sand content, and if the hole depth, the sediment thickness, the mud specific gravity and the mud sand content do not meet the standard, performing hole cleaning for the second time.
Preferably, in the sixth step, in the fourth step, the reinforcement cage is divided into a cage bottom, a middle standard section and a top cage, the cage bottom, the middle standard section and the top cage of each component are sequentially transported to the site to be installed into the reinforcement cage, the perpendicularity of the reinforcement cage is ensured, and the smooth connection of the joints is ensured.
Preferably, in the fifth step, the range of the reinforcement cage wrapped by the curtain is determined according to the thickness of the sludge layer, and the curtain is wrapped around the periphery of the reinforcement cage in the range of the sludge layer. The curtain is arranged in the range of the sludge layer to support the wall of the sludge layer, so that the phenomena of collapse, necking and the like of a pile hole are prevented, and meanwhile, when concrete is poured, the concrete is prevented from being poured into the sludge layer, so that the quality of a pile body is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. the pile forming quality of the cast-in-place pile in the sludge layer is effectively ensured, and the adverse stress of the pile foundation caused by the over-poured concrete is prevented;
2. the concrete over-square is effectively prevented, and the curtain is low in price and easy to manufacture, so that the construction cost is saved;
3. the construction is convenient, and the curtain is only required to be sleeved on the reinforcement cage and sinks into the sludge layer together with the reinforcement cage to form the wall protection effect;
4. the quality of secondary hole cleaning is improved, and diseases such as hole collapse and necking of a sludge layer are effectively prevented;
5. the embedding depth of the pile casing can be reduced, and the pile casing does not need to be embedded at the bottom of a sludge layer;
6. the influence on adjacent pile positions is reduced, so that the construction speed can be improved;
7. if pile breakage occurs in the filling process, the water level in the hole can be drained for treatment, and the curtain can play a role in supporting the hole wall through the support of the reinforcement cage, so that the safety of personnel entering the hole is ensured;
8. the method is not limited to the construction on a sludge layer, and can also be used for plugging a cave formed in a pile hole, such as a karst cave, hole wall collapse and the like, so as to prevent the concrete from over-filling or losing.
Drawings
FIG. 1 is a flow chart of a construction method of a curtain-method retaining wall cast-in-place pile according to the present invention;
FIG. 2 is a schematic view showing the installation of a reinforcement cage and a curtain in the construction method of a curtain-method retaining wall cast-in-place pile of the present invention;
fig. 3 is a cross-sectional view of the area a-a in fig. 2.
Wherein: 1-a reinforcement cage; 2-curtain; and 3, protecting the layer cushion block.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
The embodiment provides a curtain method retaining wall cast-in-place pile construction method, which comprises the following steps:
the method comprises the following steps: surface treatment and embedding of pile casings: leveling and reinforcing the ground surface according to the actual situation on site, and reinforcing the ground surface if the strength of the ground surface is not enough to bear the construction load of the pile foundation; the pile casing in the embodiment adopts a steel pile casing, and the embedding depth is not less than 3 m.
Step two: preparing slurry: and excavating a mud pit beside the pile hole to prepare the non-dispersed low-solid-phase high-viscosity PHP mud, stirring by using a mud stirrer in the preparation process, adding clear water during stirring, and then gradually adding bentonite and soda for stirring until the consistency of the mud meets the requirement.
Step three: drilling and grouting: drilling a hole by adopting rotary drilling, aligning the center of a drill bit of a drilling machine with the center of the pile guard, ensuring that the allowable deviation is not more than +/-20 mm, slowly drilling in a muddy ground under light pressure, uninterruptedly drilling at one time, timely cleaning drilling slag, timely injecting slurry meeting the requirement in the drilling process, ensuring the height of the slurry in a pile hole, detecting the slurry on time, adjusting the slurry according to the detection result, and when drilling in a muddy stratum, increasing the specific gravity of the slurry and controlling the specific gravity to be 1.2-1.3g/cm3(ii) a Meanwhile, the verticality of the drill rod is observed at any time, the plane position of the pile hole is retested, the settlement around the pile casing and ground cracks are observed, and the occurrence of deviated holes or collapsed holes is prevented.
Step four: manufacturing a reinforcement cage 1: according to design requirements, a bottom cage, a middle standard knot and a top cage of a reinforcement cage 1 are lapped, the size of a steel bar lapping section is controlled, the requirements of single-side lap welding for 10d, the seam thickness S is more than or equal to 0.3d, and the seam width b is more than or equal to 0.7d are met, a group of concrete protective layer cushion blocks 3 are arranged at intervals of 2m in the longitudinal length of each section of the reinforcement cage 1, each group of protective layer cushion blocks 3 comprises 6-8 blocks, the same group of protective layer cushion blocks 3 are located on the same section and are circumferentially and symmetrically arranged along the reinforcement cage 1, and as shown in figure 3, the protective layer cushion blocks 3 are; and then, all welded reinforcement cage 1 assemblies are sequentially conveyed to a construction site for installation according to the sequence of bottom cage, middle standard section and top cage, the reinforcement cage 1 on the site is placed on a flat, dry and solid ground, the verticality is ensured, and the reinforcement bar spacing and the joint position are ensured to meet the requirements.
Step five: mounting a curtain: wrap up the curtain 2 of high strength around steel reinforcement cage 1, the longitudinal overlap joint length of curtain 2 satisfies the requirement, wraps up the intraformational steel reinforcement cage 1 of silt, and it passes through nylon rope fixed connection with concrete cover cushion 3 to wrap up around steel reinforcement cage 1, its overlap joint condition is like figure 2, and the curtain 2 lower extreme and the inseparable fixed connection of steel reinforcement cage 1, prevent to turn over on the lower jaw of curtain 2 in the cage in-process down. In this embodiment, the curtain 2 is made of nylon color cloth strips, the tensile strength of which is not less than 1600N/4cm, and other embodiments may also use other materials to wrap the reinforcement cage 1, such as a steel wire mesh, but the tensile strength of the selected material needs to be calculated according to factors such as the diameter of a pile hole and the concrete filling pressure in the actual construction process, and the calculation formula is as follows:
Pw≥PL/2h
wherein: pw: tensile strength of curtain, P: concrete pouring pressure, L: pile hole diameter, h: the effective thickness of the curtain.
Step six: and (3) lowering a reinforcement cage 1: and (3) enabling the installed reinforcement cage 1 and the installed heavy curtain 2 to pass through the lower part of the crane to reach the specified pile hole depth, and in the lowering process, keeping the reinforcement cage 1 in a vertical state and aligning the reinforcement cage with the pile hole position to be slowly and lightly released.
Step seven: hole cleaning: cleaning the sediment at the bottom of a pile hole, detecting the environment in the pile hole, detecting the hole depth, the sediment thickness at the bottom of the hole, the mud proportion, the mud sand content and the like, controlling the mud proportion to be 1.03-1.15, controlling the sand content to be less than or equal to 2%, controlling the sediment thickness in the pile hole to be not more than 50mm (the sediment thickness at the bottom of a friction pile hole is less than or equal to 100mm, and the sediment thickness at the bottom of an end-bearing pile hole is less than or equal to 50mm), when all indexes meet the requirements, installing a guide pipe after the inspection is qualified, selecting a guide pipe with regular and smooth appearance and good sealing property for installation, ensuring that the filling capacity of the guide pipe meets the requirement of the initial filling amount of concrete, ensuring that the concrete strength of a waterproof plug is not lower than that of a pile body, embedding the guide pipe into the pile hole for 2-6m, re-inspecting all indexes of the mud.
Step eight: pouring concrete: after the hole cleaning is finished and all indexes in the pile hole meet the standard requirements, concrete is poured immediately, the buried depth of the guide pipe is controlled to be 2-6m in the pouring process, and finally the pile is formed.
Compared with the traditional construction method of the slurry wall protection cast-in-place pile, if the cast-in-place pile with the length of 40 meters and the diameter of 2 meters is prepared, the thickness of the sludge layer is 20 meters, the concrete is cast by adopting the traditional slurry wall protection method, the over-square coefficient of the concrete is generally more than 1.5, and the over-square coefficient of the concrete is controlled within 1.2 by adopting the curtain method for casting the concrete, so that the concrete can be saved by 37.7 meters3The construction cost is saved; in addition, the curtain adopted in the embodiment is nylon colored cloth strips, when the tensile strength of the colored cloth strips is not less than 1600N/4cm, 4-6 layers of colored cloth strips are adopted to wrap the reinforcement cage through calculation, the diameter of the curtain with the length of 22 meters on the market is 2m, the cost of the curtain is about 864 yuan, and the current market price of C30 concrete is about 300 yuan/m3Saving concrete by 37.7m3The 11310 yuan is saved, the two are obtained, the curtain adopted by the scheme is low in price and easy to manufacture, and the construction cost is well saved.
In conclusion, according to the curtain-method retaining wall cast-in-place pile construction method provided by the invention, the high-strength curtain 2 is wrapped on the periphery of the steel reinforcement cage 1, and in the process of lowering the steel reinforcement cage, the high-strength curtain 2 is brought into the pile hole to protect the wall of the sludge layer and support the subsequently filled concrete, so that the conditions of necking and collapse of the wall of the hole in the process of clearing the hole are avoided, the concrete oversteer is reduced, and the construction cost is saved.
The above description is only a partial example of the present invention, and does not limit the embodiments and the protection scope of the present invention, therefore, it should be recognized that the present invention is covered by the protection scope of the present invention by the equivalent substitution and obvious change made by the description of the present invention for those skilled in the art.
Claims (7)
1. The curtain method retaining wall cast-in-place pile construction method is characterized by comprising the following steps of:
the method comprises the following steps: surface treatment and embedding of pile casings: leveling and reinforcing the ground surface, and then embedding a pile casing in the ground surface;
step two: preparing slurry: preparing PHP slurry;
step three: drilling and grouting: driving a pile protector around the pile protector embedded in the first step, aligning the center of a drill bit of the drilling machine with the center of the pile protector, and injecting prepared slurry in the drilling process;
step four: manufacturing a steel reinforcement cage: overlapping all the steel bars, and welding the steel bars into a steel bar cage;
step five: mounting a curtain: wrapping a curtain around the periphery of the steel reinforcement cage;
step six: and (4) placing a reinforcement cage: lowering the manufactured reinforcement cage and the manufactured curtain to the specified pile hole depth;
step seven: hole cleaning: cleaning the sediment at the bottom of the pile hole, detecting the environment in the pile hole, and performing the next step after the sediment meets the standard, or performing secondary hole cleaning;
step eight: pouring concrete: and pouring underwater concrete into the pile hole.
2. The curtain-method dado cast-in-place pile construction method of claim 1, wherein in the fourth step, a set of protective layer cushion blocks is arranged every 2m in the longitudinal length of the reinforcement cage, each set of protective layer cushion blocks comprises 6-8 blocks, and the protective layer cushion blocks in the same set are located on the same cross section and are circumferentially and symmetrically arranged along the reinforcement cage.
3. The curtain-method dado cast-in-place pile construction method of claim 2, wherein in the fifth step, the curtain is fixedly connected with the reinforcement protection pad through a non-metallic material.
4. The curtain-method retaining wall cast-in-place pile construction method of claim 1, wherein in the fifth step, tensile strength P of the curtainwThe pile pouring pressure P, the diameter L of the pile hole and the effective thickness h of the curtain are determined, and can be calculated by the following calculation formula:
Pw≥PL/2h
5. the curtain method retaining wall filling pile construction method according to claim 1, wherein in the seventh step, the detection of the environment in the pile comprises detecting hole depth, sediment thickness at the bottom of the hole, mud specific gravity and mud sand content, and if the hole depth, sediment thickness, mud specific gravity and mud sand content do not meet the standard, the hole cleaning is performed for the second time.
6. The curtain wall pile driving construction process of claim 1, wherein in step four, the reinforcement cage is divided into a cage bottom, a middle standard knot and a top cage, and the cage bottom-middle standard knot-top cage components are sequentially transported to a site to be installed into the reinforcement cage.
7. The curtain-method retaining wall cast-in-place pile construction process according to claim 1, wherein in the fifth step, a range in which the reinforcement cage is wrapped by the curtain is determined according to a thickness of the sludge layer, and the curtain is wrapped around the periphery of the reinforcement cage within the range of the sludge layer.
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