CN2565870Y

CN2565870Y - Reinforced concrete cross-section-changeable composite pile

Info

Publication number: CN2565870Y
Application number: CN 02268698
Authority: CN
Inventors: 孙涛
Original assignee: QINGDAO INSTITUTE OF SURVEYING AND MAPPING SURVEY
Current assignee: QINGDAO INSTITUTE OF SURVEYING AND MAPPING SURVEY
Priority date: 2002-08-08
Filing date: 2002-08-08
Publication date: 2003-08-13
Anticipated expiration: 2012-08-08

Abstract

The utility model discloses a reinforced cement soil cross-section-changeable composite pile (1). The bottom end of a cement soil pile (5) which is formed by the mixture of stirring and spiral spraying is provided with a cement soil enlarging head body (2) which is formed by cylinder-shaped spiral spraying and combined with the pile body of the cement soil pile (5) into integration, wherein, the diameter of the cement soil enlarging head body (2) is longer than that of the pile body. At least one cement soil enlarging disk (3) which is formed by cylinder-shaped spiral spraying and combined with the cement soil pile (5) into integration is arranged on an upward position of the cement soil pile (5), wherein, the diameter of the cement soil enlarging disk (3) is longer than that of the pile body. The center of the pile is provided with a reinforced concrete prefabricated pile (4). The reinforced cement soil cross-section-changeable composite pile provided by the utility model carries out control through two aspects, such as the control of the strength and the rigidity of the pile body and the side friction resistance and the end bearing capacity of the pile so as to achieve the purposes of providing optimal piles for rock soil engineering and reducing engineering cost.

Description

Reinforced cement earth variable cross-section composite pile

Affiliated technical field

The utility model relates to the improvement of a kind of geotechnical engineering with the structure of stake.

Background technology

At present, cement earth pile relatively more commonly used roughly has two big classes in the known geotechnical engineering: comprise agitation pile and rotary churning pile.

In the cement earth pile, being shaped as of agitation pile is cylindric, cheap, but strength of the mixing pile, rigidity, pile side friction and stake end area are less, bearing capacity is lower, its intensity is subjected to the influence on stratum, uneven situation can occur, and causing the low situation of bearing capacity because of local soil cement intensity is low is ubiquitous;

The shape that stake is revolved in spray is close to cylindric, it is higher to compare cost with agitation pile, but strength of the mixing pile and rigidity are relatively large, can penetrate hard rock-soil layer, particularly the stake footpath is variable, and stake week combines closely with the soil body, pile side friction and stake end area are bigger, its intensity is subjected to the influence on stratum, also uneven situation can occur, and causing the low situation of bearing capacity because of local soil cement intensity is low is ubiquitous.

Above-mentioned two kinds of stakes all do not have to provide from the strength and stiffness of pile body and pile side friction and two aspects of bearing capacity of pile tip optimal geotechnical engineering with stake.

Before the utility model design is finished, not seeing the reinforced cement earth variable cross-section composite pile identical with the utility model structure as yet uses in people's routine work, not seeing the reinforced cement earth variable cross-section composite pile identical with the utility model structure has sale, and it is on the books in the literature again also not see the reinforced cement earth variable cross-section identical with the utility model structure.

Summary of the invention

The purpose of this utility model is to provide a kind of reinforced cement earth variable cross-section composite pile, by being controlled from the strength and stiffness of pile body and pile side friction and two aspects of bearing capacity of pile tip, reaching provides the stake of optimal geotechnical engineering, reduces the purpose of construction costs.

For solving the problems of the technologies described above, the utility model adopts following technical proposals:

A kind of reinforced cement earth variable cross-section composite pile, it is characterized in that by bottom that mixing jet-grouting mixes the cement earth pile form have with cement earth pile be one, its diameter is greater than the cement-soil enlarged footing body of the cylindric churning formation of cement earth pile pile body diameter, have at least one to be one with cement earth pile at the position that said cement earth pile makes progress, its diameter has precast reinforced concrete piles greater than the cement-soil expansion dish of the cylindric churning formation of cement earth pile pile body diameter at the center of said cement earth pile.

In technique scheme, the diameter of said cement-soil enlarged footing body is variable.

In technique scheme, the diameter of said cement-soil expansion dish is variable.

In technique scheme, the length between the cement-soil expansion dish can change.

In technique scheme, the surface of said precast reinforced concrete piles can be corrugated.

Technique scheme, a kind of reinforced cement earth variable cross-section composite pile is provided, its bottom presents the ring shape pile crown body of expansion, the position that makes progress in the bottom, being provided with at least one expansion dish, is precast reinforced concrete piles in the middle of it, improves pile side friction and end load greatly, improve strength of the mixing pile, become cement-soil composite pile with higher vertical bearing capacity of single pile.

The cross section of reinforced cement earth is variable, thereby makes reinforced cement earth variable cross-section composite pile be designed to different ring shapes according to the stratum actual needs, improves pile side friction and end load greatly;

The adding of reinforced cement earth variable cross-section composite pile center precast reinforced concrete piles improves strength of the mixing pile greatly, and pile body compressive strength and modulus of elasticity behind the reinforcement greatly improve, and pile body axle power can be transmitted to the pile body bottom, has improved vertical bearing capacity of single pile greatly;

It is in order further to improve the frictional force between precast reinforced concrete piles and the cement-soil that corrugated is made on the surface of precast reinforced concrete piles, avoids frictional force between invar reinforced concrete preformed pile and the cement-soil not enough and influence the situation of vertical bearing capacity of single pile.

The utility model makes the cross section of reinforced cement earth stake variable, further increase the frictional resistance and the bearing capacity of pile tip of cement-soil and surrounding soil, and the soil compaction and the effect of vibrating that produce in the process by vibrating hammer insertion precast reinforced concrete piles, the compactness and the pile side friction of cement-soil have further been improved, finally reach steel concrete and cement-soil, the optimum state of cement-soil and earth cooperation effect on every side.

The utility model has more following effects and good effect:

The utility model provides a kind of reinforced cement earth variable cross-section composite pile, is provided optimal geotechnical engineering with stake by controlling from the strength and stiffness of pile body and pile side friction and two aspects of bearing capacity of pile tip, reaching, and reduces the purpose of construction costs.

Description of drawings

Below in conjunction with drawings and Examples structure of the present utility model is described in further detail:

Fig. 1 is structure of the present utility model (vertical section) schematic diagram;

Fig. 2 is that A-A ' among Fig. 1 is to view;

Fig. 3 is that B-B ' among Fig. 1 is to view.

In the drawings,

The 1st, reinforced cement earth variable cross-section composite pile, the 2nd, enlarged footing body, the 3rd, expansion dish, the 4th, precast reinforced concrete piles, the 5th, cement earth pile.

A kind of reinforced concrete cross-section-changeable composite pile 1 is characterized in that mixing the cement that forms by mixing jet-grouting The bottom of soil stake 5 has with cement earth pile 5 and is integrated, and its diameter is greater than the cylinder of cement earth pile 5 pile body diameters The soil cement enlarged footing body 2 that the shape churning forms has one at least at the position that said cement earth pile 5 makes progress Be integrated with cement earth pile 5, its diameter forms greater than the cylindric churning of cement earth pile 5 pile body diameters Soil cement expansion dish 3 has precast reinforced concrete piles 4 at the center of said cement earth pile 5.

In technique scheme, the diameter of said soil cement enlarged footing body 2 is variable.

In technique scheme, the diameter of said soil cement expansion dish 3 is variable.

In technique scheme, the length between the soil cement expansion dish 3 can change.

In technique scheme, the surface of said precast reinforced concrete piles 4 can be corrugated.

The specific embodiment

Embodiment 1:

Fig. 1 is structure (vertical section) schematic diagram of embodiment 1 of the present utility model;

Fig. 2 is that A-A ' among Fig. 1 is to view;

Fig. 3 is that B-B ' among Fig. 1 is to view.

A kind of reinforced cement earth variable cross-section composite pile 1, it is characterized in that by bottom that mixing jet-grouting mixes the cement earth pile 5 forms have with cement earth pile 5 be one, its diameter is greater than the cement-soil enlarged footing body 2 of the cylindric churning formation of cement earth pile 5 pile body diameters, have at the position that said cement earth pile 5 makes progress three with cement earth pile 5 for one, its diameter is greater than the cement-soil expansion dish 3 of the cylindric churning formation of cement earth pile 5 pile body diameters, at the center of said cement earth pile 5 precast reinforced concrete piles 4 is arranged, the surface of said precast reinforced concrete piles 4 is a corrugated.

Claims

1. a reinforced cement earth variable cross-section composite pile (1), it is characterized in that by bottom that mixing jet-grouting mixes the cement earth pile (5) forms have with cement earth pile (5) be one, its diameter is greater than the cement-soil enlarged footing body (2) of the cylindric churning formation of cement earth pile (5) pile body diameter, have at least at the position that said cement earth pile (5) makes progress one with cement earth pile (5) for one, its diameter has precast reinforced concrete piles (4) greater than the cement-soil expansion dish (3) of the cylindric churning formation of cement earth pile (5) pile body diameter at the center of said cement earth pile (5).

2. reinforced cement earth variable cross-section composite pile according to claim 1 (1) is characterized in that the surface of said precast reinforced concrete piles (4) can be corrugated.