CN2177747Y

CN2177747Y - Prefabricated special X type square pile

Info

Publication number: CN2177747Y
Application number: CN 93208720
Authority: CN
Inventors: 管自立
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-30
Filing date: 1993-03-30
Publication date: 1994-09-21
Anticipated expiration: 2003-03-30

Abstract

The utility model relates to special-shaped prefabricated square pile for the soft soil foundation in a civil building engineering. The utility model is characterized in that a pile body comprises two corresponding straight edges (1) and two corresponding inner concave curved edges (2), and the curved edges are best inner concave semicircle curves. Compared with the present hollow square, the special-shaped square pile has bigger periphery area, thus directly enhancing the bearing force of a pile, and saving the engineering cost. Simultaneously because the hollow circle formed by the pile is divided into two halves which extend outward, the soil squeezing quantity for pressing the pile is directly reduced, thus effectively improving the soil squeezing effect of pressing the pile. According to the process of making the pile, the special-shaped prefabricated square pile can be produced in batches at sites, so the utility model has practical popularizing and applying value.

Description

Prefabricated special X type square pile

The utility model stake relates to the civil construction project soft foundation, employed stake in the pile foundation.

Soft foundation, preformed pile adopt the silent piling construction, have effectively improved environmental effect.

And can the construction costs of preformed pile and soil compaction effect thereof be to be directly connected to be promoted, and stake type therefore reasonable in design is vital.

Its type design of section of preformed pile, all improving preformed pile folk prescription concrete bearing capacity, existing stake type section has square, hollow square, garden type, hollow pipe type, triangular form, H type, I shape and other special-shaped section, above-mentioned many patterns, except that solid side stake, other are all types of all to be restricted because of difficulties such as field fabrication, stackings.

Because the application of aerated capsule makes solid side's stake become hollow square pile and be able to extensive use, be example with 500 * 500 endoporus φ, 300 hollow piles in recent years, it can save 30% concrete amount than respective party stake.

In order to improve the piling soil compaction effect, reduce with relax since the piling soil compaction to the damage of adjacent pile foundation, neighbour's building and underground pipeline, the handlebar hollow pile of remaining silent changes the open hollow stake into again recently, foundation soil is clamp-oned in the hollow garden of a heart, but because stake cubsoil plug effect, it is limited that soil enters hollow parts, so the open hollow stake also is the partial upgrading soil compaction effect.

The utility model purpose is existing stake type is improved, and a kind of new construction shaped pile is provided, and has defective to overcome existing stake type.Thereby improve the preformed pile bearing capacity of single pile, reduce construction costs, reduce and mitigation piling soil compaction effect.

The scheme of the utility model shaped pile is the hollow garden of open hollow side's stake to be divided into two and half garden shapes concave towards side stake both sides and make the stake of X type side.

Fig. 1 is a kind of embodiment section structure schematic diagram of the utility model X type shaped pile.It is straight flange (1) that this stake, pile body section have two corresponding sides, and in addition two corresponding sides are inner concave curve (2), and two bent limits are preferably half garden ogee curve s to the pile body indent, and ogee curve s two ends, half garden are straight line.Pile body external form contour shape can be a square, also can be rectangle, and its size is looked designing requirement and determined.

The advantage of this novel shaped pile because it is divided into two and half garden shapes to hollow garden and makes towards the outside, like this, not only obtains bigger peripheral area than hollow square pile, thereby has directly improved bearing capacity of single pile, saves construction costs.And because the hollow garden of this type makes in two outwardly, it influences the casting effect with regard to the stake cubsoil plug that do not have hollow pile, thereby has effectively improved the soil compaction effect of piling.

Through theoretical computational analysis, solid side's stake, hollow square pile, the stake of X type side, its relevant technologies economic indicator are seen attached list:

The stake type	Solid side's stake	Hollow square pile	The stake of X type side
				Schematic diagram
Section net area (m ²）	0.25	0.179	0.179
				The area ratio	1.0	0.717	0.717
Girth (m)	2.0	2.0	2.34
				The girth ratio	1.0	1.0	1.17
Folk prescription concrete girth ratio	1.0	1.40	1.65
				Unit bearing capacity soil compaction amount ratio	1.0	0.91	0.61

※ enters the hole, garden by stake long 1/3 and calculates

As fully visible, the stake of X type side has high-bearing capacity (comparing raising 17% bearing capacity with corresponding hollow square pile) and low soil compaction effect (comparing the soil compaction amount with corresponding solid side's stake is 0.61 times of solid side's stake), simultaneously, can pile up production at the scene in batch by system stake technology, therefore, this novel stake has real application value to the soft foundation pile foundation.

This shaped pile preparation method, as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, this method is pressed step and is made:

1, makes deformed bar cage (Fig. 1 (3) shows) by designing requirement earlier

2, the reinforcing cage of making is inserted punching block or wooden model (4) is spaced embark on journey (as shown in Figure 2) by designing requirement.

3, pour concrete pile, concrete reach the demoulding (as shown in Figure 3) after the final set.

4, with moulding stake compartment, put into the deformed bar cage again.

5, place capsule (5) at half garden shape recess of reinforcing cage and moulding stake, and be inflated to mould, constitute garden type inflation mould.

6, pour concrete pile, after concrete reaches initial set, capsule venting, the demoulding (as shown in Figure 4).

Each campshed is made according to 1 to 7 operation again on remaining each upper strata.

Claims

1, the special-shaped precast square pile that uses in a kind of civil construction project soft foundation is characterized in that the pile body section has two corresponding straight flanges and two bent limits of corresponding indent to constitute.

2, special-shaped precast square pile according to claim 1 is characterized in that two bent limits are preferably half garden ogee curve s to the stake indent, and ogee curve s two ends, half garden are straight line.