Stiff composite pile construction process

A construction technique and composite pile technology, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve problems such as difficult to meet requirements and large impact, and achieve the effects of reliable quality, convenient construction, and fast pile formation

Pending Publication Date: 2021-08-10
胡海滨
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AI-Extracted Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of stiff composite pile construction technology, to solve the above-mentioned background technology because the geological conditions of the construction site are more and more complex, so there are certain defects in the traditional ...
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Abstract

The invention discloses a stiff composite pile construction process. The stiff composite pile construction process comprises the following steps that S1, carrier pile construction is conducted, specifically, a, a cement-soil mixing pile with the diameter of phi 500-900 mm is adopted for a carrier pile, full pile casing follow-up impact hole forming is conducted, cement mortar or fine aggregate concrete is poured into a hole, the cement doping amount in an empty drilling area is 9%-11%, and the cement doping amount in an effective pile length area is 17%-21%; and b, carrier construction is completed; S2, a pile casing is pulled out by a carrier pile machine; and S3, a precast pile body is put down, and the pile is conveyed to the designed elevation in a static pressure or hammering mode, a, the precast pile body adopts a prestressed concrete pipe pile, the effective pile length is 42 m, and the precast pile body is constructed within 6 h after carrier construction is completed. According to the stiff composite pile construction process, construction is convenient, the secondary compaction and reinforcement effect on filling soil around a pile body is achieved, the physical and mechanical properties of a soil body around the pile are effectively improved, the stiff composite pile construction process can adapt to complex geological conditions such as deep filling soil, the construction process is different from a conventional soil compaction process, and the influence on the surrounding environment is greatly reduced.

Application Domain

Bulkheads/piles

Technology Topic

Geotechnical engineeringPre stress +6

Image

  • Stiff composite pile construction process
  • Stiff composite pile construction process

Examples

  • Experimental program(3)

Example Embodiment

[0030] Example 1:
[0031] S1: Construction of carrier piles
[0032] a. Carrier pile uses φ500mm cement soil mixing pile, all cartridges follow into the impact molding hole, the hole in the hole, the cement dial in the air diamond region is 9%, the effective pile length area cement is 17%;
[0033] b. The carrier construction is completed, and the pile driver is in place.
[0034] S2: Carrier pile driver
[0035] S3: Defining prefabricated piles, use static or hammering to send pile to design elevation
[0036] a. Prefabricated piles adopt a prestressed concrete pipe pile, an effective pile length of 42m, and the prefabricated pile body is taken within 6 hours after the carrier construction is completed;
[0037] b. After the mixing pile driver is applied, the static press is positioned, the positioning pile center error is controlled within 10mm, and the static press should be aligned with the center point of the pile position, and start the platform of the platform. Cylinder, corrected pile machine horizontal gesture; outside the pile machine influence in the range of agitating piles, the surrounding distribution is set up four orientation;
[0038] c. Construction of the piles continuously, the intermediate interval time of the same pile is less than 30 minutes; when the pile contact is prefabricated, the two welding is used, and the connection strength should be greater than the prestressed concrete pile strength.
[0039] The carrier pile hole is perfusion material for cement mortar.
[0040] The consolidation range of the carrier pile is much larger than the outer rig blade, the cement slurry is a diffusible slurry, its natural diffusion range is greater than the stirring range, and the 28D no-limit compressive strength of the mounting soil is not less than 0.8 MPa.
[0041] The prefabricated pile adopts the 42.5 ordinary silicate cement, the water as average ratio is 0.6-1.0, and the cement slurry relative density is detected by the slurry specific gravity to control the ash ratio, thereby ensuring the design requirements of the cement to meet the design requirements. The reinforcing soil is converted, and the slurry flow is controlled by the flow meter.
[0042] The connection and pressing work between the pile segments are required within 3 hours after the construction of the prefabricated pile core is completed.
[0043] When the complex pile is piled, 50 g of a dedicated sealing material is applied to the end face of the next pile, and the sealing material is composed of an epoxy resin, a curing agent, and the operating time is controlled within 2 minutes, and the initial coagulation does not exceed 6 h, and the final coagulation time is not more than 6h. No more than 12h.
[0044] The upper end of the superior connection of the composite pile is provided with a steel end plate. When two connection piles are connected up and down, the top of the connection end plate and the lower-level connection pile is adopted by two welding.

Example Embodiment

[0045] Example 2:
[0046] S1: Construction of carrier piles
[0047] a. Carrier pile uses φ700mm cement soil mixing pile, all cartridge follow-up impact molding, hole in the hole, the cement mixture in the air diamond region is 10%, the effective pile length area cement is 19%;
[0048] b. The carrier construction is completed, and the pile driver is in place.
[0049] S2: Carrier pile driver
[0050] S3: Defining prefabricated piles, use static or hammering to send pile to design elevation
[0051] a. Prefabricated piles adopt a prestressed concrete pipe pile, an effective pile length of 42m, and the prefabricated pile body is taken within 6 hours after the carrier construction is completed;
[0052] b. After the mixing pile driver is applied, the static press is positioned, the positioning pile center error is controlled within 10mm, and the static press should be aligned with the center point of the pile position, and start the platform of the platform. Cylinder, corrected pile machine horizontal gesture; outside the pile machine influence in the range of agitating piles, the surrounding distribution is set up four orientation;
[0053] c. Construction of the piles continuously, the intermediate interval time of the same pile is less than 30 minutes; when the pile contact is prefabricated, the two welding is used, and the connection strength should be greater than the prestressed concrete pile strength.
[0054] The carrier pile hole is perfusion material for cement mortar.
[0055] The consolidation range of the carrier pile is much larger than the outer rig blade, the cement slurry is a diffusible slurry, its natural diffusion range is greater than the stirring range, and the 28D no-limit compressive strength of the mounting soil is not less than 0.8 MPa.
[0056]The prefabricated pile adopts the 42.5 ordinary silicate cement, the water as average ratio is 0.6-1.0, and the cement slurry relative density is detected by the slurry specific gravity to control the ash ratio, thereby ensuring the design requirements of the cement to meet the design requirements. The reinforcing soil is converted, and the slurry flow is controlled by the flow meter.
[0057] The connection and pressing work between the pile segments are required within 3 hours after the construction of the prefabricated pile core is completed.
[0058] When the complex pile is piled, 50 g of a dedicated sealing material is applied to the end face of the next pile, and the sealing material is composed of an epoxy resin, a curing agent, and the operating time is controlled within 2 minutes, and the initial coagulation does not exceed 6 h, and the final coagulation time is not more than 6h. No more than 12h.
[0059] The upper end of the superior connection of the composite pile is provided with a steel end plate. When two connection piles are connected up and down, the top of the connection end plate and the lower-level connection pile is adopted by two welding.

Example Embodiment

[0060] Example 3:
[0061] S1: Construction of carrier piles
[0062] a. Carrier pile uses φ900mm cement soil mixing pile, full cartridge follow into the impact molding hole, perforation of fine stone concrete, hole in the air diamond region is 9-11%, effective pile length area cement incoming amount is twenty one%;
[0063] b. The carrier construction is completed, and the pile driver is in place.
[0064] S2: Carrier pile driver
[0065] S3: Defining prefabricated piles, use static or hammering to send pile to design elevation
[0066] a. Prefabricated piles adopt a prestressed concrete pipe pile, an effective pile length of 42m, and the prefabricated pile body is taken within 6 hours after the carrier construction is completed;
[0067] b. After the mixing pile driver is applied, the static press is positioned, the positioning pile center error is controlled within 10mm, and the static press should be aligned with the center point of the pile position, and start the platform of the platform. Cylinder, corrected pile machine horizontal gesture; outside the pile machine influence in the range of agitating piles, the surrounding distribution is set up four orientation;
[0068] c. Construction of the piles continuously, the intermediate interval time of the same pile is less than 30 minutes; when the pile contact is prefabricated, the two welding is used, and the connection strength should be greater than the prestressed concrete pile strength.
[0069] The perfusion material in the carrier pile hole is fine stone concrete.
[0070] The consolidation range of the carrier pile is much larger than the outer rig blade, the cement slurry is a diffusible slurry, its natural diffusion range is greater than the stirring range, and the 28D no-limit compressive strength of the mounting soil is not less than 0.8 MPa.
[0071] The prefabricated pile adopts the 42.5 ordinary silicate cement, the water as average ratio is 0.6-1.0, and the cement slurry relative density is detected by the slurry specific gravity to control the ash ratio, thereby ensuring the design requirements of the cement to meet the design requirements. The reinforcing soil is converted, and the slurry flow is controlled by the flow meter.
[0072] The connection and pressing work between the pile segments are required within 3 hours after the construction of the prefabricated pile core is completed.
[0073] When the complex pile is piled, 50 g of a dedicated sealing material is applied to the end face of the next pile, and the sealing material is composed of an epoxy resin, a curing agent, and the operating time is controlled within 2 minutes, and the initial coagulation does not exceed 6 h, and the final coagulation time is not more than 6h. No more than 12h.
[0074] The lower end of the superior connection of the composite pile is provided with a connection steel end plate. When two connection piles are connected, the connection end plate and the lower-level connection pile are used in two welding welding.

PUM

PropertyMeasurementUnit
Compressive strength>= 0.8MPa

Description & Claims & Application Information

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