CN2294295Y

CN2294295Y - Pipe sank prefabricated steel concrete bottom expansion pile

Info

Publication number: CN2294295Y
Application number: CN 96221594
Authority: CN
Inventors: 王国奋
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-09-13
Filing date: 1996-09-13
Publication date: 1998-10-14
Anticipated expiration: 2006-09-13

Abstract

The utility model relates to a sunk-pipe prefabricated steel concrete bottom-expansion pile which is especially suitable to for general industries, civil architectures and high-rise buildings to be used as an ideal pile foundation. The utility model is formed in the way that a prefabricated pile body and a pouring pedestal are connected into a whole, wherein the pile body is prefabricated steel concrete which has insertion ribs, the pedestal is pouring steel concrete, the maximum diameter of the pedestal or the diameter of the pile body is greater than or equal to a range of 1 to 1.5 m and is less than or equal to 5.5 m, and the pedestal and the pile body are connected into a whole in an anchoring way through the insertion ribs on the pile body under the positioning action of sunk pipes. Pile bodies with different sections are adopted to be connected with pedestals with different diameters and shapes to form piles with variable bearing capacity and different stress conditions. The utility model has the advantages of flexible application, wide service ranges, simple pile-forming process, high pile quality, high pile bearing capacity and low pile foundation cost.

Description

Pipe sinking prefabricated steel concrete club-footed pile

The utility model relates to the stake of using in a kind of engineering foundation basis, the suitable especially desirable pile foundation as general industry and civilian construction and highrise building.

The most widely used in the soft foundation at present is tube-sinking cast-in-situ pile, and account for more than 80% of total quantity of various stake, but the stake of this kind structure, pile quality can not guarantee, have 10～20% stake not reach requirement approximately, particularly near weak soil layer or near the ground in broken pile, necking take place easily, force the designer that bearing capacity of single pile is on the low sidely fixed, cause following to gather, cause that soil body gross distortion jeopardizes pile quality.

Application number 93119260.9 " pre-poured composite tube stake and pile-formation process thereof and equipment ", though a kind of expanded bore pile that improves pile capacity and pile quality also is provided, it is definite and regular inadequately that it expands the end, application is restricted.

The patent SU1564267A1 of the former Soviet Union " high-bearing capacity stake " adopts precast reinforced concrete pile, but expansion end scope is little, and effect is not remarkable.

The purpose of this utility model is to provide a kind of pipe sinking prefabricated steel concrete club-footed pile, can guarantee quality of pile, improves bearing capacity, and formation of pile is simple, reduces the ratio of single pile cost and bearing capacity of single pile.

The utility model is achieved in that pipe sinking prefabricated steel concrete club-footed pile connects into integral body by precast pile and perfusion base and constitutes, and pile body is the precast reinforced concrete that has joint bar, base is perfusion steel concrete, 1～1.5≤base maximum dimension D/pile body diameter d≤5.5, base, pile body are utilized joint bar butt joint anchor connection one-tenth integral body on it under the immersed tube location.

Fig. 1. the utility model structural representation;

Fig. 2. cast-in-place flat steel concrete base and pile body connection diagram;

Fig. 3. cast-in-place sunken bottom steel concrete base and pile body connection diagram;

Fig. 4. radial steel reinforcement launches schematic diagram on the stake baseplane;

Fig. 5. circular precast pile sectional schematic diagram;

Fig. 6. annular precast pile sectional schematic diagram;

Fig. 7. rectangle precast pile sectional schematic diagram;

Fig. 8. top rake triangle precast pile sectional schematic diagram;

Fig. 9. prefabricated compound concrete pile body sectional schematic diagram;

Figure 10. prefabricated clad steel concrete pile body sectional schematic diagram;

Below in conjunction with accompanying drawing embodiment of the present utility model is further described:

The pile body diameter of section be d between 250～700 millimeters, base is the expanded bore pile of cast-in-situ steel concrete, base cross section maximum diameter is D, 1～1.5≤D/d≤5.5.

Base (1 ') top is positive frustum of a cone, and it is spherical that the lower part is, and the bottom is a convex surface, cone surface and axle clamp angle α≤and 45 °, base (1) top is positive frustum of a cone, and the lower part is cylinder, and the bottom is the plane.

Joint bar (3) is a wire rod, can be embedded in the pile body bottom in advance, is welded on the pile body bottom or freely is arranged on the pile body bottom.

Pile body (8), (11), (12), (9) they are solid circle for its cross section of precast reinforced concrete, rectangle, and top rake triangle, or hollow thick ring shape, processing can be given in the pile body surface, increases pile body frictional force.Also can in the annular prestressed steel concrete preformed pile of thin-walled, water concrete or in the annular prestressed steel concrete preformed pile of heavy wall, water the hot-metal carburized steel concrete and make circular section composite pile body (13), (14) that hollow, solid section is mixed.

Square being directly proportional of pile capacity and base diameter, so the bigger pile capacity of base diameter is big, if D/d 〉=1.5 should dispose radial steel reinforcement.

Hinged by distribution bar (5) head and the tail, be polygon after the expansion, main muscle (4) afterbody and iron plate (7) are movable to be hinged, it is rounded to launch the back, iron plate (7) bottom surface is provided with iron nail, and odd number (or even number) main muscle (4) head and distribution bar (5) hinge point constitute fixing hinge (6) and form radial steel reinforcement, and radial steel reinforcement is positioned over the base (1) of cast-in-situ steel concrete, in (1 '), utilize the iron nail of iron plate (7) bottom, hammer into location in the base.

During use, in hardpan, in immersed tube (10), pour into the base of steel concrete by cutting the earth, fetching earth, again prefabricated steel concrete pile body is passed through from immersed tube (10), under immersed tube (10) location, utilize the joint bar (3) on it to insert in the base, upper and lower two parts butt joint anchoring becomes whole pipe sinking prefabricated steel concrete club-footed pile, and guarantees that by immersed tube (10) center of circle, base cross section is coaxial with the pile body center.

Select for use the base of the pile body of different cross section, diameter and different-diameter, shape to be complementary, the end bearing pile of three kinds of different stressing conditions of one-tenth capable of being combined, end holds friction pile, and friction piles etc. become the stake of bearing capacity.

As to adopt the cross section be rectangle, the leg-of-mutton pile body of top rake, gives processing through the surface again, forms friction pile, and Fa＞Pa, Fa are frictional force, and Pa is the end load.

As to adopt the cross section be the pile body of circular, annular or annular compound steel concrete, form end bearing pile Pa＞＞Fa.

As to adopt the cross section be the pile body of annular compound concrete, forms end and hold friction pile Pa＞Fa.

The utility model is compared with prior art: this is a kind of stake of new structure, and the joint bar of pile body lower end is stretched In the inserted base, in assembling process, precast pile is played positioning action at the bottom of going out, and guarantee the end by immersed tube The seat center of circle, cross section is coaxial with the pile body center, has joint bar can overcome again the additional bending moment of pile body and base junction, To guaranteeing that pile bearing capacity provides Reliable guarantee, so the quality of pile height, and formation of pile is easy. Again therefore stake Be club-footed pile, and can accomplish 1～1.5≤D/d≤5.5, base is big, has greatly improved the bearing capacity of stake, because of And the ratio of decrease single pile cost and bearing capacity of single pile, thereby also reduced making of whole foundation engineering Valency. This also has very strong resistance to plucking ability.

Can select the pile body of different cross section, pile body diameter to connect and compose different from the base of different-diameter and shape The stake of the change bearing capacity of stressing conditions, applying flexible, its highly versatile has enlarged the range of application of stake, Greatly improved the use value of stake.

Claims

1. pipe sinking prefabricated steel concrete club-footed pile, connecting into integral body by precast pile and perfusion base constitutes, it is characterized in that pile body is the precast reinforced concrete that has joint bar (3), base is perfusion steel concrete, 1～1.5≤base maximum dimension D/pile body diameter d≤5.5, base, pile body utilize joint bar on it (3) butt joint anchor connection to become whole under immersed tube (10) location.

2. according to the described expanded bore pile of claim 1, it is characterized in that joint bar (3) can be embedded in the pile body bottom in advance or is welded on the pile body bottom and freely is arranged on the pile body bottom.

3. according to the described expanded bore pile of claim 1, it is characterized in that base (1), (1 ') top are positive frustum of a cone, cone surface and axle clamp angle α≤45 °, lower part base (1) is cylinder, and the bottom is the plane, and base (1 ') is spherical, the bottom is a convex surface, the pile body cross section is circular (8) rectangle (1), top rake triangle (12), annular (9) and annular and circular compound circle (13) (14), and the center of circle, bottom section is coaxial with the pile body center.

4. according to the described expanded bore pile of claim 1, it is characterized in that in the base radial steel reinforcement being set, hinged by distribution bar (5) head and the tail, be polygon after the expansion, main muscle (4) afterbody or iron plate (7) are movably hinged, it is rounded to launch the back, and iron plate (7) bottom surface is provided with iron nail, and odd number (idol) main muscle (4) head and distribution bar (5) hinge point constitute fixing hinge (6).