CN2131967Y

CN2131967Y - Bottom expanding unit for drilled stake hole

Info

Publication number: CN2131967Y
Application number: CN 92229576
Authority: CN
Inventors: 孔清华; 桂淞莉
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-28
Filing date: 1992-07-28
Publication date: 1993-05-05
Anticipated expiration: 2002-07-28

Abstract

The utility model discloses a bottom expanding device for hole drilling piles, comprising an upper and a lower connecting rods which are provided with an erasing knife and are hinged with a drill rod; The rotary down-pressing movement of the drill rod is transferred to the upper and the lower connecting rods via a driving disc welded on the drill rod; a guiding mechanism and a location mechanism are arranged below the drill rod; following the rotatablely gliding of the drill rod, the erasing knife arranged on the upper and the lower connecting rods is gradually expanded to circumference along trace to cut earth; the bottom hole of a pile is expanded into a pear head shape to make slurry not easily deposit on a slope, and thus the bearing force of the pile end is greatly increased. The bottom expanding device provides a safe bottom expanding device for the bottom expanding process step of hole drilling filling piles, and enhances the bearing capacity of finished piles.

Description

Bottom expanding unit for drilled stake hole

The utility model relates to device at the bottom of the expansion of drilled pile in the civil construction project foundation.

In civil construction project steel bar concrete Bored Pile Construction, be generally wet construction, promptly adopt the mud off of certain weight proportion, being bored into design altitude carries out clearly the hole and inserts reinforcing cage and underwater grouting concrete pile, there is following shortcoming in this class stake concerning high-rise building and high heavy building: stake bed mud slurry precipitation forms the bearing capacity of soft formation influence stake, mainly uses pile perimeter resistance, use minimum stake end bearing power, heavy in section pile shaft material intensity can not be not fully exerted.

The purpose of this utility model is to overcome the defective of prior art and provides a kind of is equipment--the device at the bottom of the expansion of drilled pile that improves an end bearing ability, increases expansion basic skill or training preface, about device makes a bottom be twice than the pile body diameter expansion at the bottom of this expansion.

Embodiment of the present utility model promptly is that drilling rod passes the drive plate that is welded with stiffened panel and welds one with it mutually, it is hinged that the last connecting rod that scraper is housed passes the notch and the drilling rod of drive plate, make the rotation of drilling rod press down power and pass to connecting rod by drive plate, and the last connecting rod that scraper is housed is hinged with the lower link that scraper is housed, guiding mechanism and the detent mechanism that makes itself rotate and move vertically downward is equipped with in the below of drilling rod, the scraper that the rotation downward motion of drilling rod is driven on the upper and lower connecting rod is cut soil by track to the circumference expansion, reaches the purpose of enlarged opening on pile bottom.Press device at the bottom of the expansion of drilled pile of the utility model design, for increase expanding basic skill or training's preface, bored pile provides device at the bottom of the safe and reliable expansion, about the stake bottom is twice than the pile body diameter expansion, improved stake end bearing power, thereby improve the bearing capacity of stake, high-rise and high heavy building is had special meaning.

Fig. 1 is the structural representation of this device.

Fig. 2 is the A--A sectional view of Fig. 1.

Fig. 3 is the B--B sectional view of Fig. 1.

Fig. 4 is guiding mechanism 4 and detent mechanism 7 structural representations among Fig. 1.

Fig. 5 is the C--C sectional view of Fig. 4.

Fig. 6 is the D--D sectional view of Fig. 4.

Fig. 7 is the E--E sectional view of Fig. 4.

Fig. 8 is the F--F sectional view of Fig. 4.

Fig. 9 is the upper and lower connecting rod scraper connection diagram among Fig. 1.

Figure 10 is each cross-sectional view of Fig. 9.

Be described in further detail according to above-mentioned accompanying drawing embodiment.

See Fig. 1--10, device promptly connects and to expand end device and carry out bottom reaming and process shedding drill bit after the Completion of Drilling Hole at the bottom of the expansion of drilled pile.It comprises drilling rod (1), and to go up connecting rod (3) hinged with being equipped with 4 pairs of scraper (6) for drilling rod (1), and by 4 groups of upper junction plates (8) uniform on drilling rod (1) circumference, it goes up the hinged (see figure 2) of connecting rod (3) by bolt assembly (9) with 4 pairs.Below at a distance of above-mentioned pin joint is provided with drive plate (2), drive plate (2) is gone up welding 4 uniform stiffened panels (10), all solid welding is on drilling rod (1), drive plate (2) has 4 uniform notches, last connecting rod (3) passes notch and the hinged (see figure 3) of drilling rod (1), and the power that drilling rod (1) rotation is pressed down passes to connecting rod (3) through drive plate (2).

Upper and lower connecting rod (3), (5) are mutually hinged and weld 4 alloy scrapers (6), the distribution of the alloy scraper (6) on each connecting rod is vertically for being equally spaced, and every adjacent scraper stagger 1/4 week in the shape of a spiral shape arrange, 4 form the native task of cutting of a circumference of finishing to scraper.

In cutting soil process, drilling rod (1) needs to do rotation and vertical depression action, therefore the Lower Half at boring bar (1) is provided with guiding mechanism (4) and the detent mechanism (7) that drilling rod glides, 4 pairs of upper and lower connecting rods (3), (5) can be launched to circumference flexibly when assurance drilling rod (1) rotation pressed down slip, what form the pears head cuts the earthy attitude, and expands the diameter at the end at the bottom of can calculating according to the distance that rotation presses down.

Guiding mechanism (4) comprises upper and lower pipe joint (11), (14) that are welded on coulisse (13) two ends, 4 coulisses (13) are strengthened hoop (22) welding one with 4, drilling rod (1) lower end is threaded with pipe close (12), pipe close (12) has 4 uniform notches, and drilling rod (1) is along coulisse (13) slippage downwards between upper and lower pipe joint (11), (14).The lower end periphery of coulisse (13) is being welded lower connecting plate (15), and the lower end of lower link (5) is hinged with it.

Detent mechanism (7) comprises being welded on stiffener (17), limiting plate (16) and lower ball base (20) on the base plate (21), adorn ball (19) between the recessed circle of recessed circle on the lower ball base (20) and following pipe joint (14), the rotation of drilling rod (1) and downward motion are bearing on the ball (19), guarantee motion nimbly and freely.4 locating pins (18) are housed under the base plate (21), and this locating pin (18) is inserted in the soil positioner is fixed.The vacant part of base plate (21) is drilled with a plurality of holes, the resistance when promoting to reduce.

The rotation of the utility model drilling rod (1) presses down the scraper (6) that drives on upper and lower connecting rod (3), (5) through drive plate (2) and glides while rotating, and launches to cut soil to circumference gradually, realizes expanding end purpose.Bellout diameter is determined by the distance of drilling rod (1) displacement downward vertically.Expand the end and finish the back and promote drilling rod and unload and expand end device, downcomer is inserted clear once more hole behind the reinforcing cage in the hole then, waters the concrete pile in conduit.

Claims

1, device at the bottom of a kind of expansion of drilled pile comprises drilling rod (1), it is characterized in that:

A. drilling rod (1) passes the drive plate (2) that is welded with stiffened panel (10) and welding mutually with it, and it is hinged that the last connecting rod (3) that scraper (6) is housed passes the notch and the drilling rod (1) of drive plate (2);

B., the last connecting rod (3) of scraper (6) is housed and the lower link (5) of scraper (6) is housed hinged;

C. the guiding mechanism (4) and the detent mechanism (7) of drilling rod rotation and motion vertically downward is equipped with in the below of drilling rod (1);

D. the lower end of lower link (5) is hinged on the lower connecting plate (15) of guiding mechanism (4).

2, device at the bottom of the expansion as claimed in claim 1 is characterized in that being fixed on per 4 on upper and lower connecting rod (3), (5) scraper (6) vertically is equally spaced, and every adjacent scraper (6) stagger 1/4 week in the shape of a spiral formula arrange.

3, device at the bottom of the expansion as claimed in claim 1, it is characterized in that described guiding mechanism (4) comprises upper and lower pipe joint (11), (14) that are welded on coulisse (13) two ends, and pipe close (12) upper and lower slip between upper and lower pipe joint (11), (14) of drilling rod (1) lower end welding, the lower end periphery of coulisse (13) is being welded lower connecting plate (15), and lower link (5) lower end is hinged with it.

4, device at the bottom of the expansion as claimed in claim 1, it is characterized in that described detent mechanism (7) comprises stiffener (17), limiting plate (16) and the lower ball base (20) that is fixed on the base plate (21), adorn ball (19) between lower ball base (20) and the following pipe joint (14), at least 3 locating pins (18) are housed under the base plate (21).