CN111172997A - Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall - Google Patents

Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall Download PDF

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Publication number
CN111172997A
CN111172997A CN202010075424.XA CN202010075424A CN111172997A CN 111172997 A CN111172997 A CN 111172997A CN 202010075424 A CN202010075424 A CN 202010075424A CN 111172997 A CN111172997 A CN 111172997A
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China
Prior art keywords
foundation pit
shock
pile
absorbing
enclosure
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CN202010075424.XA
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Chinese (zh)
Inventor
黄博
张钰钰
陈银萍
伍琳
曾宇
杜怡韩
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Anhui Polytechnic University
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Anhui Polytechnic University
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Priority to CN202010075424.XA priority Critical patent/CN111172997A/en
Publication of CN111172997A publication Critical patent/CN111172997A/en
Pending legal-status Critical Current

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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0037—Clays
    • E02D2300/004—Bentonite or bentonite-like

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Foundations (AREA)

Abstract

The invention provides a foundation pit prefabricated enclosure shock-absorbing pile; the pile comprises a pile body, wherein a liquid storage tank is arranged on the upper end face of the pile body, and a circular hole which vertically penetrates through the lower end face of the pile body is formed in the bottom of the liquid storage tank. The cover plate and the liquid storage tank wall form a waterproof space, mud is poured into the waterproof space, the mud plays a role in filtering earth surface vibration, and the circular pipeline also plays an isolation role in vibration transmission. The invention also provides a method for constructing the foundation pit enclosure wall, which comprises the following steps: excavating grooves section by section at the position where the foundation pit support structure is to be built; hoisting the prefabricated enclosure shock-absorbing piles of the foundation pit to a preset position one by one, and extracting slurry in a gap between the two shock-absorbing piles; and pumping out the slurry in the liquid storage tanks and the circular pipelines of all the prefabricated enclosure shock-absorbing piles of the foundation pit one by one, and then injecting the shock-absorbing slurry into the waterproof space to complete the construction of the foundation pit enclosure structure. The foundation pit prefabricated enclosure shock absorption piles are used for enclosing the foundation pit, so that the construction quality of the enclosure structure can be guaranteed, and the obvious seismic isolation and reduction effects are achieved on the structure inside the foundation pit.

Description

Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall
Technical Field
The invention relates to the technical field of damping of underground engineering, in particular to a foundation pit prefabricated enclosure damping pile with a seismic reduction and isolation effect in foundation pit engineering.
The invention also relates to a method for building the foundation pit enclosure wall.
Background
In recent years, with the rapid development of urban underground engineering, the construction environment is becoming more and more complex, and the problems of earthquake resistance and shock absorption of underground structures are receiving more and more attention. Urban underground engineering may be influenced by various dynamic actions such as earthquake, blasting construction, vehicle load and the like, and inevitably generates damage and even destruction phenomena.
The traditional vibration reduction and isolation measures mainly include that a vibration isolation groove is arranged to play a role in vibration isolation, methods for increasing the strength of an enclosure structure are adopted, for example, cement soil mixing piles are adopted to enhance the resistance to the vibration effect, and special construction steps are adopted to weaken the influence of the vibration effect. However, the traditional seismic isolation and reduction methods have the defects of unobvious effect, high cost and high labor intensity, and have great influence on the environment.
Therefore, a seismic isolation and reduction method with ideal effect, good economy, small influence on the environment and lower labor intensity is lacked in the foundation pit engineering.
Disclosure of Invention
The invention aims to solve the technical problem of providing a foundation pit prefabricated enclosure shock absorption pile which is reasonable in structure and good in shock absorption effect.
The invention aims to solve the technical problem of providing a method for building a foundation pit enclosure wall.
In order to solve the technical problem, the invention provides a foundation pit prefabricated enclosure shock-absorbing pile;
the pile comprises a pile body, wherein a liquid storage tank is arranged on the upper end face of the pile body, and a circular hole which vertically penetrates through the lower end face of the pile body is formed in the bottom of the liquid storage tank.
Preferably, the upper end surface of the pile body is provided with a plurality of lifting hooks.
Preferably, the wall of the liquid storage tank is paved with waterproof coiled materials.
Preferably, two water stop belts are arranged on the side wall of one side of the pile body, the two water stop belts are placed in parallel, and the two water stop belts extend to the upper end face and the lower end face of the pile body.
Preferably, the liquid storage tank is positioned at the center of the upper end face of the pile body, the cross section of the pile body is square, and the cross section of the liquid storage tank is also square;
supposing that the length and width of the pile body are L and the height is H, the length and width of the liquid storage tank are L1 and the depth is H1, the inner diameter of the round hole is D, and the length is H2;
then: h2 ═ H-H1;
L1＝(50％～60％)L；
H1＝(2.5％～5％)H；
D＝200～250mm。
as preferred, still including the apron, the shape of apron is identical with the liquid storage tank bottom profile, and the apron up end is equipped with the handle, and the waterproofing membrane with the same type of liquid storage tank is all laid to the apron surface, and the apron periphery is provided with the sealing rod, and when the apron was placed in the liquid storage tank bottom, the round hole up end was shielded completely to the apron, and the apron forms water proof space with the liquid storage tank pool wall.
Preferably, the lower end face of the pile body is hinged with a pile bottom cover matched with the lower end opening of the round hole.
After adopting such structure, pour into mud in the water proof space that forms between apron and liquid storage tank pool wall, mud can play the effect of filtering the great earth's surface vibrations of influence during fender pile work, and circular pipeline has also played certain isolated effect to the vibration transmission in non-earth's surface region.
The beneficial technical effect of this prefabricated enclosure shock attenuation stake of foundation pit is: the quality of the enclosure structure can be fully ensured by adopting the prefabricated structure; when realizing its seismic isolation target that subtracts, the precast pile can retrieve and recycle, embodies to have better economic nature, and building rubbish is few, and is less to the influence of environment.
In order to solve the technical problem, the invention also provides a method for constructing the foundation pit enclosure wall by using the foundation pit prefabricated enclosure shock absorption pile, which comprises the following steps:
a) excavating a groove section by section at the position where the foundation pit enclosure structure is to be built, and performing wall protection by using wall protection slurry while excavating the groove;
b) after each section of groove is excavated, hoisting the foundation pit prefabricated enclosure shock-absorbing piles one by one, hoisting the side face, provided with the water stop, of the foundation pit prefabricated enclosure shock-absorbing pile to a preset position towards the position of the next foundation pit prefabricated enclosure shock-absorbing pile, and extracting slurry in a gap between piles, which is surrounded by the two water stop and the two foundation pit prefabricated enclosure shock-absorbing piles;
c) finishing the excavation of grooves of other groove sections, and repeating the process in the step b) until the hoisting of the prefabricated enclosure shock-absorbing piles of the residual foundation pit is finished;
d) and pumping out the slurry in the liquid storage tanks of all the prefabricated enclosure shock-absorbing piles of the foundation pit and the slurry in the circular pipeline one by one, covering the cover plate, forming a waterproof space by the cover plate and the wall of the liquid storage tank, injecting the shock-absorbing slurry into the waterproof space one by one, completing the construction of the foundation pit enclosure structure, and starting the construction of underground engineering.
Preferably, the step d) is completed, after the underground engineering construction is completed, slurry in the waterproof space of the foundation pit prefabricated enclosure shock-absorbing piles is pumped out, the cover plate is opened, water stop belts among the foundation pit prefabricated enclosure shock-absorbing piles are removed, finally the foundation pit prefabricated enclosure shock-absorbing piles are lifted one by one, meanwhile, concrete is pumped through the circular pipeline, and the original pile position stratum is filled, so that the foundation pit prefabricated enclosure shock-absorbing piles are recycled, and the concrete wall replacing the foundation pit prefabricated enclosure shock-absorbing piles is poured.
Preferably, the damping slurry in the step d) is prepared by adding water into bentonite, a tackifier and soda ash and stirring, wherein the mass of the bentonite accounts for 10%, the mass of the tackifier accounts for 0-0.02%, and the mass of the soda ash accounts for 0-0.5%;
during the construction of underground works, it is necessary toMaintaining the damping slurry every day, and controlling the density of the damping slurry to be 1.10-1.15 g/cm3The viscosity is 20-22 s, and the sand content is less than 4%.
After the method is adopted, the foundation pit is enclosed by the prefabricated enclosure shock absorption pile of the foundation pit, so that the construction quality of the enclosure structure can be ensured; the liquid storage tank is arranged at the top of the prefabricated enclosure shock absorption pile of the foundation pit, the slurry is stored in the construction process, the slurry can be used for filtering earth surface vibration encountered in the construction process, and the earth surface vibration is the vibration effect which has the largest influence on urban underground engineering, so that the obvious shock absorption and isolation effect can be achieved on the structure in the foundation pit; the precast pile can be recycled, so that the influence on urban environment is small, and the economical efficiency is good.
Drawings
FIG. 1 is a diagram of a state of use of an embodiment of the prefabricated enclosure shock-absorbing pile of the foundation pit.
FIG. 2 is a sectional view of a front view of a pile body of an embodiment of the foundation pit prefabricated enclosure shock absorption pile.
Fig. 3 is a top view of fig. 2.
FIG. 4 is a perspective view of a cover plate of an embodiment of the prefabricated enclosure shock absorption pile of the foundation pit.
Detailed Description
As shown in fig. 1 to 4
The foundation pit prefabricated enclosure shock absorption pile 1 comprises a pile body 11 and a cover plate 12.
Pile body 11 is reinforced concrete square pile, the cross sectional dimension is 598mm, highly be 8000mm, 11 up end of pile body is opened there is square stock solution pond 11a, stock solution pond 11a cross sectional dimension is 300mm, the degree of depth is 400mm, waterproofing membrane has been laid to stock solution pond 11 a's pool wall, waterproofing membrane adopts elastomer modified asphalt waterproofing membrane (SBS waterproofing membrane), waterproofing membrane main control thickness when using, adopt 3 mm's coiled material can.
The bottom of the liquid storage tank 11a is provided with a circular hole 11b which vertically penetrates through the lower end face of the pile body 11, the inner diameter is 200mm, the length is 7600mm, namely, the circular hole 11a penetrates through the pile bottom from the bottom of the liquid storage tank, and meanwhile, a pipeline for pouring concrete can be arranged in the circular hole 11 b.
Four hooks 11c for hoisting are preset at the top of the pile body 11.
Be furnished with apron 12 at the bottom of liquid storage tank 11a, apron 12 is reinforced concrete slab, the cross sectional dimension is 290mm x 290mm, apron 12 top surface and bottom surface are laid with the waterproofing membrane of the same type of liquid storage tank 11a, the periphery is provided with sealing rod (water swelling rubber), apron 12 forms water proof space with liquid storage tank 11a pool wall, apron 12 top is provided with handle 12a, conveniently promote apron 12, apron 12 is placed in liquid storage tank 11a bottom, apron 12 shields round hole 11b up end completely, liquid storage tank 11a pool wall forms water proof space.
Two vertical water stop belts 11d are arranged on one side surface of the outer part of the pile body 11; two waterstops 11d are placed in parallel, are arranged from the pile top to the pile bottom and are arranged along the outermost edge of the side face, and the waterstops 11d are compression type waterstops 11d for joints of immersed tube tunnels.
The lower end face of the pile body 11 is hinged with a pile bottom cover 11e matched with the lower end opening of the round hole 11b, and after the pile body 11 is placed into the groove, the pile bottom cover 11e seals the lower end opening of the round hole 11b of the pile body 11.
Assuming that the length and width of the pile body 11 are both L and the height is H, the length and width of the liquid storage tank 11a are both L1 and the depth is H1, the inner diameter of the round hole 11b is D, and the length is H2;
then: h2 ═ H-H1;
L1＝50.16％L；
H1＝5％H；
D＝200mm。
the method for constructing the foundation pit enclosure wall is specifically introduced by combining the foundation pit prefabricated enclosure shock-absorbing pile 1, and comprises the following steps:
a) the method comprises the steps of excavating grooves section by section at a position where a foundation pit support structure is to be built, excavating the grooves and protecting walls by using wall protection slurry, wherein the width of each groove is 600mm, the depth of each groove is 8010mm, and the length of each groove is 3050 mm.
b) After the excavation of each section of groove is finished, hoisting the foundation pit prefabricated enclosure shock-absorbing piles 1 one by one, enabling the side face, provided with the water stop belt 11d, of each foundation pit prefabricated enclosure shock-absorbing pile 1 to face the position of the next foundation pit prefabricated enclosure shock-absorbing pile 1, and hoisting the foundation pit prefabricated enclosure shock-absorbing piles to a preset position; when the next foundation pit prefabricated enclosure shock-absorbing pile 1 is hoisted, the water-stop belts 11d of the previous foundation pit prefabricated enclosure shock-absorbing pile 1 are firstly attached to the water-stop belts 11d of the previous foundation pit prefabricated enclosure shock-absorbing pile 1, then a hydraulic compression method is adopted, namely, slurry in a gap between piles formed by the two water-stop belts 11d and the two foundation pit prefabricated enclosure shock-absorbing piles 1 is extracted, so that the pressure of the slurry in the gap between the piles is reduced, thus the newly installed foundation pit prefabricated enclosure shock-absorbing pile 1 forms pressure difference under the action of the slurry pressure in a groove in the region where the foundation pit prefabricated enclosure shock-absorbing pile 1 is not hoisted, the water-stop belts 11d between the two foundation pit prefabricated enclosure shock-absorbing piles 1 can be further compressed under the action of the pressure difference, so that the two foundation pit prefabricated enclosure shock-absorbing piles 1.
c) And c), excavating grooves of other groove sections, and repeating the process in the step b) until hoisting of the prefabricated enclosure shock-absorbing pile 1 of the residual foundation pit is completed.
d) And pumping out the slurry in the liquid storage tanks 11a of the prefabricated enclosure shock-absorbing piles 1 of the foundation pit and the slurry in the circular pipeline one by one, covering the cover plate 12, forming a waterproof space by the cover plate 12 and the tank wall of the liquid storage tank 11a, and injecting the shock-absorbing slurry into the waterproof space one by one to complete the construction of the foundation pit enclosure structure, so that the construction of underground engineering can be started.
The damping slurry is prepared by adding water into bentonite, a tackifier and soda ash and stirring, wherein the bentonite accounts for 10% by mass, the tackifier accounts for 0-0.02% by mass, and the soda ash accounts for 0-0.5% by mass;
in the underground engineering construction process, the damping slurry needs to be maintained every day, and the density of the damping slurry is controlled to be 1.10-1.15 g/cm3The viscosity is 20-22 s, and the sand content is less than 4%.
After the underground engineering construction is completed, slurry in the waterproof space of the foundation pit prefabricated enclosure shock-absorbing pile 1 is pumped out, the cover plate 12 is opened, the water stop belts 11d between the foundation pit prefabricated enclosure shock-absorbing pile 1 are removed, a wood formwork is used for filling gaps among the piles, finally the foundation pit prefabricated enclosure shock-absorbing pile 1 is lifted one by one, meanwhile, concrete is pumped through a circular pipeline, the original pile position stratum is filled, so that the foundation pit prefabricated enclosure shock-absorbing pile 1 is recycled and the concrete wall replacing the foundation pit prefabricated enclosure shock-absorbing pile 1 is poured, and the foundation pit prefabricated enclosure shock-absorbing pile 1 can be recycled.
The above description is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present invention, and these should also be considered as falling within the protection scope of the present invention, such as: the round pipeline can also adopt a square pipeline; the specifications of the precast pile, the liquid storage tank, the circular pipeline and the cover plate and the specific proportion among the precast pile, the liquid storage tank, the circular pipeline and the cover plate can be flexibly selected in the corresponding proportion range according to the conditions.

Claims (10)

1. The utility model provides a prefabricated enclosure shock attenuation stake of foundation ditch, characterized in that:
the pile comprises a pile body, wherein a liquid storage tank is arranged on the upper end face of the pile body, and a circular hole which vertically penetrates through the lower end face of the pile body is formed in the bottom of the liquid storage tank.
2. The foundation pit prefabricated enclosure shock-absorbing pile as claimed in claim 1, wherein:
the upper end surface of the pile body is provided with a plurality of lifting hooks.
3. The foundation pit prefabricated enclosure shock-absorbing pile as claimed in claim 1, wherein:
and waterproof coiled materials are laid on the wall of the liquid storage tank.
4. The foundation pit prefabricated enclosure shock-absorbing pile as claimed in claim 1, wherein:
two water stop belts are arranged on the side wall of one side of the pile body and are placed in parallel, and the two water stop belts extend to the upper end face and the lower end face of the pile body.
5. The foundation pit prefabricated enclosure shock-absorbing pile as claimed in claim 1, wherein:
the liquid storage tank is positioned in the center of the upper end face of the pile body, the cross section of the pile body is square, and the cross section of the liquid storage tank is also square;
supposing that the length and width of the pile body are L and the height is H, the length and width of the liquid storage tank are L1 and the depth is H1, the inner diameter of the round hole is D, and the length is H2;
then: h2 ═ H-H1;
L1＝(50％～60％)L；
H1＝(2.5％～5％)H；
D＝200～250mm。
6. the foundation pit prefabricated enclosure shock-absorbing pile as claimed in claim 3, wherein:
still include the apron, the shape of apron is identical with the liquid storage tank bottom profile, and the apron up end is equipped with the handle, and the waterproofing membrane with the same type of liquid storage tank is all laid to the apron surface, and the apron periphery is provided with the sealing rod, and when the apron was placed in the liquid storage tank bottom, the round hole up end was shielded completely to the apron, and the apron forms water proof space with the liquid storage tank pool wall.
7. The foundation pit prefabricated enclosure shock-absorbing pile as claimed in claim 1, wherein:
the lower end face of the pile body is hinged with a pile bottom cover matched with the lower end opening of the round hole.
8. A method of constructing a foundation pit retaining wall using the foundation pit prefabricated enclosure shock-absorbing piles as claimed in any one of claims 1 to 7, comprising the steps of:
a) excavating a groove section by section at the position where the foundation pit enclosure structure is to be built, and performing wall protection by using wall protection slurry while excavating the groove;
b) after each section of groove is excavated, hoisting the foundation pit prefabricated enclosure shock-absorbing piles one by one, hoisting the side face, provided with the water stop, of the foundation pit prefabricated enclosure shock-absorbing pile to a preset position towards the position of the next foundation pit prefabricated enclosure shock-absorbing pile, and extracting slurry in a gap between piles, which is surrounded by the two water stop and the two foundation pit prefabricated enclosure shock-absorbing piles;
c) finishing the excavation of grooves of other groove sections, and repeating the process in the step b) until the hoisting of the prefabricated enclosure shock-absorbing piles of the residual foundation pit is finished;
d) and pumping out the slurry in the liquid storage tanks of all the prefabricated enclosure shock-absorbing piles of the foundation pit and the slurry in the circular pipeline one by one, covering the cover plate, forming a waterproof space by the cover plate and the wall of the liquid storage tank, injecting the shock-absorbing slurry into the waterproof space one by one, completing the construction of the foundation pit enclosure structure, and starting the construction of underground engineering.
9. A method of constructing a foundation pit retaining wall according to claim 8, wherein:
and d), after the underground engineering construction is finished, pumping out slurry in the waterproof space of the foundation pit prefabricated enclosure shock-absorbing pile and opening the cover plate, removing a water stop belt between the foundation pit prefabricated enclosure shock-absorbing piles, finally lifting the foundation pit prefabricated enclosure shock-absorbing piles one by one, pumping concrete through a circular pipeline, and filling the original pile position stratum so as to realize the recovery of the foundation pit prefabricated enclosure shock-absorbing pile and the pouring of a concrete wall for replacing the foundation pit prefabricated enclosure shock-absorbing pile.
10. A method of constructing a foundation pit retaining wall according to claim 8, wherein:
the shock absorption slurry in the step d) is prepared by adding water into bentonite, a tackifier and soda ash and stirring, wherein the mass ratio of the bentonite is 10%, the mass ratio of the tackifier is 0-0.02%, and the mass ratio of the soda ash is 0-0.5%;
in the underground engineering construction process, the damping slurry needs to be maintained every day, and the density of the damping slurry is controlled to be 1.10-1.15 g/cm3The viscosity is 20-22 s, and the sand content is less than 4%.
CN202010075424.XA 2020-01-22 2020-01-22 Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall Pending CN111172997A (en)

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Application Number Priority Date Filing Date Title
CN202010075424.XA CN111172997A (en) 2020-01-22 2020-01-22 Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall

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Application Number Priority Date Filing Date Title
CN202010075424.XA CN111172997A (en) 2020-01-22 2020-01-22 Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall

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Publication Number Publication Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112281899A (en) * 2020-10-01 2021-01-29 单士营 Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112281899A (en) * 2020-10-01 2021-01-29 单士营 Foundation pit prefabricated enclosure shock absorption pile and method for building foundation pit enclosure wall

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