Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Expanded-base combination end pile bearing foundation

An end-bearing pile and foundation technology, applied in the direction of foundation structure engineering, sheet pile wall, construction, etc., can solve the problems that the cost prefabricated piles cannot be well adapted, the strength of prefabricated piles is redundant and wasteful, and the prefabricated piles are not fully utilized. Solve the effect of softening in water, increasing the stress surface of the pile end, and improving the strength performance

Inactive Publication Date: 2016-06-15
SICHUAN HUASHI CONCRETE PILE ENG CO LTD
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the shape of this type of composite pile foundation is cylindrical with the same outer diameter up and down, and the contact area with the bearing rock formation depends on the cross-sectional area of ​​the pile body, and the strength of the bearing rock formation (such as sandstone, etc.) is often much lower than that of the pile body, especially the pile. The strength of the prefabricated piles in the body, which makes the composite pile foundation not fully utilize the strength of the prefabricated piles, resulting in excessive waste of prefabricated pile strength, and low economic and social benefits
[0005] Among the existing patents of bottom-enlarging composite end-bearing pile foundations, the bottom-expanding composite pile foundation described in "A Construction Method for Pre-drilling and Bottom Expansion Grouting of Prestressed Concrete Special-shaped Pile" (publication number CN103266603A) is mainly aimed at Specific shaped piles that do not fit well with cheaper standard prefabricated piles

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Expanded-base combination end pile bearing foundation
  • Expanded-base combination end pile bearing foundation
  • Expanded-base combination end pile bearing foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the geological and construction conditions, a rotary drilling rig is used to drill holes with a diameter of 600mm at the pile forming position to a depth of 4m into the bearing rock formation, and the drilling powder is discharged in the form of dry discharge;

[0047] Replace or adjust the drill bit with progressive reaming function to ream the bottom of the pile hole to form a conical pile bottom hole with an angle of 45° between the side and the bottom surface and a thickness of 600mm. After that, clean the hole with a negative pressure dust suction device;

[0048] After the hole cleaning is completed, inject mortar with a strength grade of M10 into the hole until the volume of the remaining pile hole is equal to the volume of the prefabricated pile;

[0049] After the pouring is completed and before the initial setting of the mortar, the PC pipe pile with a diameter of 400mm is implanted in place with a spreader, so that the bottom surface of the prefab...

Embodiment 2

[0051] According to the geological and construction conditions, the rotary drilling rig is used to drill the mud retaining wall at the pile forming position, and the hole is drilled with a diameter of 800mm to a depth of 6m in the bearing rock formation;

[0052] Replace or adjust the reaming drill bit to ream the bottom of the pile hole to form a cylindrical pile bottom hole with a diameter of 1200mm and a thickness of 800mm.

[0053] Inject concrete with a strength grade of C30 from the bottom of the hole, and discharge the retaining mud at the same time;

[0054] After the pouring is completed and before the initial setting of the concrete, the PHS prestressed concrete hollow square pile with a side length of 500mm is implanted in place with a spreader, so that the distance between the bottom surface of the prefabricated pile and the bottom of the hole is 800mm, and the deviation between the pile axis and the hole axis is less than 40mm , fix the prefabricated pile until th...

Embodiment 3

[0056] According to the geological and construction conditions, a down-the-hole drilling rig is used to drill holes with a diameter of 1000mm at the pile forming position to a depth of 8m into the bearing rock formation, and the drilling powder is discharged in the form of dry discharge;

[0057] Replace or adjust the reaming drill bit, and ream the pile holes that go deep into the bearing rock formation to form a pumpkin-shaped pile bottom hole with a maximum diameter of 1600mm and a thickness of 1000mm.

[0058] Before pulling out the drill bit, inject 1:0.5 high-fluidity cement slurry mixed with water reducing agent, start the drill bit, fully stir the cement slurry and pile bottom sediment, pull out the drill bit, and continue to inject cement slurry until the volume of the remaining pile hole is equal to the volume of the prefabricated pile .

[0059] After the pouring is completed and before the initial setting of the cement slurry, use the spreader to implant the PHC pi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Diameteraaaaaaaaaa
Strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an expanded-base combination end pile bearing foundation. The expanded-base combination end pile bearing foundation comprises the two parts of a pile body and a pile base. The pile body is composed of a pile peripheral cement mixture simultaneously poured with the pile base and a prestressed centrifugal concrete pile embedded and fixed before setting of the mixture. The pile base is composed of a cement mixture which is in the shape of a circular truncated cone or a cylinder or a pumpkin (oval). According to the expanded-base combination end pile bearing foundation, the force bearing area of a supporting rocky layer is enlarged through the bottom expanded head, strength performance of the supporting layer is improved, damage of a driven tubular pile to the supporting layer is eradicated, and the problem that the supporting layer is softened with water is solved, so that the depth of the pile end, embedded into the supporting layer, of the tubular pile is increased, the pile end stress surface is increased, the bearing capacity of the whole pile is improved, and the utilization rate of the strength of the prestressed centrifugal concrete pile body is increased. Compared with end bearing piles directly driven into the supporting rocky layer through hammering construction, the expanded-base combination end pile bearing foundation causes small damage to the supporting layer, and is free of the soil squeezing effect, shake, lamp black and noise pollution and suitable for supporting layers of intense, intermediate and weak weathered mudstone and sandstone.

Description

technical field [0001] The invention belongs to a pile foundation in the construction field, in particular to a bottom-expanding combined end-bearing pile foundation. Background technique [0002] As a common foundation method, concrete pile foundation is widely used in various civil engineering fields. Whether it is bored piles or prefabricated piles constructed by hammering or static pressure, the concrete pile foundation has been proved by many years of engineering practice at home and abroad that this type of foundation form is mature and has significant advantages over other foundation types. [0003] In recent years, the industry has formed a type of composite pile foundation with prefabricated piles covered with concrete by first drilling holes and then implanting prefabricated piles. This type of foundation integrates the characteristics of bored piles and prefabricated piles, and has the characteristics of no damage to the pile body and no extrusion during construct...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E02D5/50E02D5/58
CPCE02D5/50E02D5/58
Inventor 胡刚余翔
Owner SICHUAN HUASHI CONCRETE PILE ENG CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com