CN207620726U - One kind can undergauge bit - Google Patents

Abstract

It can undergauge bit the utility model is related to one kind, the drill bit includes six square joints, moving vane one, pivot bolt, shaft, anchor ear, inserted pin special, moving vane two, spray orifice one, moving vane three, plate tooth, spray orifice two, spray orifice three, six square joint is connect with drilling rod, moving vane one, moving vane two, moving vane three is mounted on by pivot bolt and inserted pin special on respective anchor ear, and the plate tooth is mounted on moving vane three, and the spray orifice is arranged on shaft.The utility model can the large size prefabricated hollow unit of construction quick, without squeezing soil, and can whitewash as needed liquid, dry powder or other reinforcement materials are to improve the bearing capacity of pile body.

Description

A shrinkable drill bit

technical field

The utility model relates to underground construction machinery, in particular to a diameter-reducible drill bit that can be directly pulled out from a hollow part of a prefabricated hollow member.

Background technique

At present, the pile foundation construction methods mainly include manual digging piles, hammering piles, static pressure piles, bored piles, etc. The efficiency of manual digging piles is low, and the risk of construction personnel is high; the noise pollution during the construction of hammering piles is serious , which strictly restricts its development; although the static pressure pile has the characteristics of low noise and no pollution, its soil squeezing effect is obvious, and it cannot penetrate into the middle and micronize the rock surface, so that the bearing capacity of the high-strength prefabricated pile has not been fully exerted; The cast-in-place piles are protected by mud, which causes serious mud pollution. A diameter-reducible drill bit and a construction method thereof can effectively solve the above difficulties.

Utility model content

The purpose of the utility model is to provide a diameter-reducible drill bit. In order to solve the above problems, the shrinkable drill bit is used in the construction of prefabricated hollow components, which can realize non-extruded soil construction, and can also choose whether to spray grout, dry powder or other reinforcement materials for reinforcement to improve the bearing capacity, and can also be used for rock construction. The high load-carrying capacity of the prefabricated hollow components can be brought into full play, the cost can be reduced, the diameter-reducing drill bit can be cut and constructed, and the diameter can be reduced and pulled out after the pile sinking, so the construction is convenient and the efficiency is high.

The utility model is realized by the following technical means:

A diameter-reducible drill bit, the drill bit mainly includes a hexagonal joint, a movable blade 1, a fulcrum bolt, a shaft, a hoop, a special pin, a movable blade 2, a spray hole 1, a movable blade 3, plate teeth, a spray hole 2, Spray hole three, the hexagonal joint is connected with the drill pipe, the movable blade one, the movable blade two, and the movable blade three are all installed on their respective hoops through fulcrum bolts and special pins, and the plate teeth are installed on the movable blade three, The spray hole is arranged on the shaft.

The drill bit is mainly used for prefabricated hollow components with an inner diameter greater than 400mm.

Plate teeth or picks are inlaid on the movable blades.

The drill bit is provided with a plurality of spray holes, which can be used for spraying air, spraying slurry liquid and spraying dry powder.

When the prefabricated hollow member sinks in place, the special pin is sheared off under the tension provided by the special pile driver or by the self-weight of the pile body, so as to realize the contraction of the blade.

Compared with the prior art, the utility model provides a reduceable drill bit and its construction method, which has the following advantages:

1. The drill bit is used to excavate the soil first and then sink the pile for construction. During the construction process, there is no noise, no soil extrusion, and little impact on the environment;

2. The movable blade of the drill bit can be inlaid with high-strength plate teeth and picks, which can be used for rock-entry construction, so that the bearing capacity of the prefabricated components can be fully exerted in the hard ground, and the construction cost can be reduced;

3. The drill bit adopts multi-spray hole design, and can choose to inject grout, dry powder or other reinforcement materials according to geological conditions for reinforcement and increase the bearing capacity of single piles;

4. Cutting construction with diameter-reduced drill bit, the diameter can be reduced and pulled out after pile sinking, which is convenient for construction and high pile sinking efficiency.

Description of drawings

Figure 1 is a schematic diagram of the structure of the shrinkable drill bit

1 Hexagonal joint 2 Movable blade 1 3 Pivot bolt 4 Shaft rod 5 Hoop 6 Special pin 7 Movable blade 2 8 Nozzle 1 9 Movable blade 3 10 Teeth 11 Nozzle 2 12 Nozzle 3

Figure 2 is a schematic diagram of pile sinking construction with shrinkable drill bit

13 Prefabricated hollow member 14 Special pile driver 15 Reducible drill bit

Figure 3 is a schematic diagram of pulling out the drill bit of the reduceable diameter drill bit

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

Example

As shown in Fig. 1, a kind of diameter reducing drill bit and construction method thereof, described drill bit mainly comprises hexagonal joint 1, movable blade 1 2, fulcrum bolt 3, shaft rod 4, hoop 5, special pin 6, movable blade 2 7. Nozzle one 8, movable blade three 9, plate teeth 10, nozzle two 11, nozzle three 12, the hexagonal joint 1 is connected with the special pile driver drill pipe, movable blade one 2, movable blade two 7, movable The three blades 9 are all installed on the respective hoops 5 through the fulcrum bolts 2 and the special bolts 6, the plate teeth 10 are installed on the movable blade three 9, and the spray holes are arranged on the shaft.

The utility model relates to a construction method of a diameter-reducible drill bit, which comprises the following steps:

1) stakeout, special pile driver 14 is in place;

2) Disassemble the drill pipe, insert the large-size prefabricated hollow member 13 into the drill pipe, and connect the diameter-reducible drill bit 15. At this time, the movable blades 1, 2, 7, and 9 on the diameter-reducible drill bit 15 are opened state;

3) Turn on the mechanical power device, turn it down, and spray grout, air or dry powder at the same time if necessary;

4) After reaching the design elevation, lift the diameter-reducible drill bit 15, pull the special pin 6 for strong shearing, and retract the movable blade 1 2, movable blade 2 7, and movable blade 3 9, and cling to the shaft 4;

5) Take out the drill pipe, reinstall the special pin 6 on the reduceable drill bit 15, and then move to the next construction position to repeat the previous steps 1) to 5).

Claims (5)

1. A drill bit that can be reduced in diameter, the drill bit includes a hexagonal joint, movable blade 1, fulcrum bolt, shaft rod, hoop, special pin, movable blade 2, spray hole 1, movable blade 3, plate teeth, spray hole 2 3. Spray hole 3, the hexagonal joint is connected with the drill pipe, the movable blade 1, the movable blade 2 and the movable blade 3 are all installed on their respective hoops through fulcrum bolts and special bolts, and the plate teeth are installed on the movable blade 3 , the spray hole is arranged on the shaft. 2. A diameter-reducible drill bit according to claim 1, characterized in that, the drill bit is used for prefabricated hollow components with an inner diameter greater than 400mm. 3. A diameter-reducible drill bit according to claim 1, characterized in that, said movable blades are inlaid with teeth or picks. 4. A diameter-reducible drill bit according to claim 1, characterized in that the drill bit is provided with a plurality of spray holes, which can be used for spraying air, spraying grout and spraying dry powder. 5 . The diameter-reducible drill bit according to claim 1 , wherein the special pin is sheared off when the prefabricated hollow member sinks in place to realize blade shrinkage. 6 .