CN218757447U

CN218757447U - Multifunctional pile foundation structure

Info

Publication number: CN218757447U
Application number: CN202122860761.2U
Authority: CN
Inventors: 陈宏湛
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-14
Filing date: 2021-11-14
Publication date: 2023-03-28
Anticipated expiration: 2031-11-14

Abstract

A pile foundation structure with multiple functions is characterized in that a pile group structure with the pile diameter of 300-1000mm contains prestressed pipe piles and water seepage prestressed pipe piles, the pile spacing of the prestressed pipe piles is 8-30m, the pile length exceeds the pile length of other pipe piles by 2-6m, water seepage holes with the pore diameter of 10-20mm are arranged along the pile body, seepage filter cloth is pasted outside the holes, the pile ends are sealed and welded by steel plates or provided with pile tips, and the ratio of the pile number of the water seepage prestressed pipe piles to the pile number of the conventional prestressed pipe piles is 1: 4-15. The pre-embedding of the water seepage holes is to pre-embed and tie the water seepage plastic pipe on the prestressed reinforcement cage when the pile is manufactured. Compared with the existing pile foundation, the method has the advantages that besides the bearing function of the common pile foundation, the method also has the advantages that the sludge drainage consolidation with low foundation bearing capacity is sludge clay with high foundation bearing capacity and low water content, the foundation bearing capacity and the pile side frictional resistance are improved, the pile foundation using amount is reduced, and the carbon emission is reduced.

Description

Multifunctional pile foundation structure

Technical Field

The utility model relates to a building foundation field especially relates to a pile foundation structure with it is multi-functional.

Background

China JGJ 94-2008 construction pile foundation technical Specification section 3 basic design regulation: 3.1.1, the pile foundation should be designed according to the following two kinds of limit states: 1 bearing capacity limit state: the pile foundation reaches the maximum bearing capacity. 2 normal use limit state: the pile foundation reaches a deformation limit value specified by normal use of the building. The specification of the pile foundation only considers that the pile foundation has a bearing function, so that the prestressed pipe pile produced in China only has a prestressed concrete pipe wall no matter the thick wall or the thin wall, can only bear load and cannot drain water,a sand-filled tubular pile with high bearing capacity and pile sections and a manufacturing and constructing method thereof (CN201210106228. X) with water penetration and drainage functions is characterized in that pile sections which are 0.5-20cm larger than the pile body are arranged on the pile body of the tubular pile every 0.3-4m, the pile sections are 0.5-20cm wide and are provided with longitudinal drainage holes, a small amount of water in silt around the pile can be drained through sand filling around the pile, a dewatering funnel cannot be formed, if some 1cm diameter drainage holes are reserved on the pipe wall, water in silt soil with the water content of more than 75% can be seeped into the pipe cavity and pumped out by a submersible pump to form a tens of meters deep dewatering funnel, the silt soil can be rapidly solidified, and the original side resistance is 0.4-0.5t/m ² Increased to 0.7-1t/m ² The number of piles can be greatly reduced, one pile is multifunctional, resource waste is reduced, and engineering cost is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pile foundation structure with it is multi-functional, except satisfying the function of undertaking vertical and horizontal load in the national "JGJ 94-2008 building pile foundation technical specification" say, still have in the high mucky soil layer of coastal weak soil area water content, the hyperstatic pore water pressure and the crowded native effect that the pile was aroused are driven in quick release, make the mucky soil water content fall to below 40 fast in a second week time, play silt drainage solidification, improve foundation bearing capacity and stake side frictional resistance, reduce the pile foundation quantity, reduce the carbon emission.

The utility model adopts the technical proposal that: a pile foundation structure with multiple functions is characterized in that a pile group structure with the pile diameter of 300-1000mm contains prestressed pipe piles and water seepage prestressed pipe piles, the pile spacing of the prestressed pipe piles is 8-30m, the pile length exceeds the pile length of other pipe piles by 2-6m, water seepage holes with the pore diameter of 10-20mm are arranged along the pile body, seepage filter cloth is pasted outside the holes, the pile ends are sealed and welded by steel plates or provided with pile tips, and the ratio of the pile number of the water seepage prestressed pipe piles to the pile number of the conventional prestressed pipe piles is 1: 4-15. The pre-embedding of the water seepage holes is to bind a water seepage plastic pipe on the prestressed reinforcement cage during pile making.

The flowing distance of water between a muck layer and a mucky soil layer in a soft soil foundation in China is 0.02-1 cm every day and night, the permeability coefficient is very small, the water drainage is very slow, after the water-permeable prestressed pipe pile is applied, water in the peripheral soil layer enters a pipe cavity of the prestressed pipe pile through water-permeable holes, a precipitation funnel (hydraulic gradient) with the height of tens of meters is formed after water is pumped in a pipe cavity at the top of the pile, the permeability coefficient is enlarged by dozens to hundreds of times, and the downward flow velocity of the water is measured by meters to tens of meters every hour, so the water-rich silt can be drained and consolidated in one week, and the bearing capacity of the foundation and the lateral frictional resistance of the pile are improved. After the drainage consolidation and foundation treatment of the pile foundation, the pile foundation can still be used as a common engineering pile (the diameter and the length of the pile foundation can be the same as those of the common engineering pile), and the using amount of the pile foundation is reduced.

The utility model discloses compare with current pile foundation, except having the bearing function of ordinary pile foundation, still have the silt drainage consolidation that the foundation bearing capacity is low for the silt matter clay that the foundation bearing capacity is high, the water content is low, improve foundation bearing capacity and pile side frictional resistance, reduce the pile foundation quantity, reduce the carbon and discharge.

Description of the drawings:

fig. 1 is a schematic construction section view of the embodiment of the present invention.

Description of the drawings: 1 slag layer, 2 water-poor sludge layer, 3 prestressed pipe piles, 4 soil plugs, 5 water-seepage prestressed pipe piles, 6 water seepage holes adhered with seepage filter cloth, 7 water pumping pipes, 8 water outlets, 9 precipitation funnel boundary lines, 10 water-rich sludge layer and 11 submersible pumps.

Detailed Description

As shown in fig. 1, the utility model discloses construction process flow is:

1. as shown in figure 1, according to the water content of sludge in a site engineering geological survey report being more than 70 and the change characteristics of soil texture and soil layer, designing a pile position arrangement diagram of the prestressed pipe piles (3), selecting the number of the water seepage prestressed pipe piles (5) at the periphery and the center of the site, and increasing the length of the pile by 6m so as to pump water from the pipe cavities of the water seepage prestressed pipe piles (5) by using a down-the-hole pump (11) after pile forming, wherein the formed water pumping funnel curve (9) is positioned at the lower ends of all the prestressed pipe piles by 1-3m;

2. cutting the chemical fiber filter cloth into square blocks, and adhering the square blocks on the water seepage holes (6) of the water seepage prestressed pipe pile (5) by using glue;

3. driving the water seepage prestressed pipe piles (5) around the field into the soil by using a pile driver, and driving the residual water seepage prestressed pipe piles (5) into the soil;

4. pumping water from the pipe cavity of the water seepage prestressed pipe pile (5) by using a down-the-hole pump (11), wherein the water passes through a water pipe (7) and is discharged from a water outlet (8);

5. the prestressed pipe piles (5) are all driven into the soil by a pile driver;

6. as long as there is water in infiltration prestressing force tubular pile (5) lumen during whole construction, all will carry out and draw water, until there is not water in the lumen, precipitation funnel boundary (9) just have formed, form lean water silt layer (2) on precipitation funnel boundary (9), be rich water silt layer (10) below precipitation funnel boundary (9), the embodiment of the utility model provides a preparation is accomplished.

Claims

1. A pile foundation structure with multiple functions is characterized in that a pile group structure with the pile diameter of 300-1000mm contains prestressed pipe piles and water seepage prestressed pipe piles, the pile spacing of the latter is 8-30m, the pile length exceeds the pile length of other pipe piles by 2-6m, water seepage holes with the pore diameter of 10-20mm are arranged along the pile body, seepage filter cloth is pasted outside the holes, the pile ends are sealed and welded by steel plates or pile tips are arranged, the ratio of the pile number of the water seepage prestressed pipe piles to the pile number of the conventional prestressed pipe piles is 1: 4-15, and the water seepage holes are pre-buried by pre-burying and tying water seepage plastic pipes on prestressed reinforcement cages during pile making.