CN101649614A

CN101649614A - Variable-diameter multi-direction anchor pile

Info

Publication number: CN101649614A
Application number: CN200810041702A
Authority: CN
Inventors: 刘全林; 宋伟民
Original assignee: 刘全林; 宋伟民
Current assignee: Shanghai Qiangjin Foundation Engineering Co Ltd
Priority date: 2008-08-14
Filing date: 2008-08-14
Publication date: 2010-02-17

Abstract

The invention provides a variable-diameter multi-direction anchor pile, which is an anchor body for reinforcing and supporting soft rock and soil in geotechnical engineering. As the bond force betweensoft rock-soil masses and the anchor body is limited, only grouting, rotary jet, stirring or anchor pull is not big in effect of improving the strength and stability of the soft rock-soil masses, lowin reinforcing speed, difficult to control reinforcing effect and the like, thus the application range of the soft rock-soil masses is often limited. Therefore, the variable-diameter multi-directionanchor pile is invented and has the specific characteristics that a soft rock-soil layer is drilled through special equipment, and cement slurry and other cementitious materials are sprayed to be mixed well with cut broken rock-soil masses; quick strengthener is added at the same time; stirring-rotating direction and rotary jet pressure are controlled; and a special anchor part is added so as to form a variable-diameter multi-direction anchor body. The diameter of the formed anchor pile can reach 300 to 15,000 millimeters.

Description

A kind of multi-direction anchor pile that becomes diameter

One, technical field:

The present invention relates in the geotechnical engineering a kind of anchoring process, especially the weak rocks soil body is carried out initiatively reinforcing and a kind of technology of supporting weak rock-reinforcing and supporting.

Two, background technology:

When reinforcing with supporting to the weak rocks soil layer, method commonly used at present has retaining wall and bracket support structure, and they all belong to the passive protecting method; And active support method commonly used has: grouting and reinforcing, bolt anchorage, linked network sprayed mortar are reinforced, cement-soil stirs reinforcing and rotary jet strengthening etc.This active reinforcing and supporting method owing to can effectively improve self intensity of ground, can reduce supporting and reinforcement cost greatly and praised highly by people.But because the adhesion stress of the weak rocks soil body and anchoring body is limited, that only slip casting, churning, stirring or anchor draw is little to the raising effect of the intensity of the weak rocks soil body and globality, enhancing speed is slower, and strengthen effect and be difficult to reasons such as control, usually limited their range of application, generally can only use as a kind of auxiliary supporting and reinforcement measure, for example this class supporting method commonly used is done auxiliary supporting in the supporting in foundation ditch and tunnel.Therefore, in the reinforcing of geotechnical engineering and support technology, be badly in need of a kind of anchoring process that weak ground is strengthened fast.

Three, summary of the invention:

Pass through special-purpose machines and tools, rotating stirring by the direction of design in the weak rocks soil layer creeps into, cementitious material such as the cement paste of spray are simultaneously fully mixed with the geotechnical body that is cut fragmentation, add fast strong agent simultaneously, direction of rotation, churning pressure are stirred in control, add special-purpose muscle firmware and form an oblique anchoring body that becomes diameter.By fast anchor, make the broken ground mixture of dowel material and formed cement tight bond together, produce better anchoring force fast.Injection rate by gels such as control injection pressure, rate of penetration, cement pastes forms the oblique anchoring pile body that becomes diameter in different weak ground, its anchoring body structure as shown in Figure 1.

The particular content of patent of the present invention is as follows:

1, makes the method for weak rocks soil body quick anchoring

In weakness, the kata-rocks soil body, by the facility of stirring, churning or rotary jet stirring, cement grout isogel material is mixed gluing with geotechnical body, add special-purpose fast strong agent, with quick anchoring spare, can make the weak rocks soil body reach quick enhancing and improve the effect of its globality.

Special-purpose fast strong agent (calcium salt class complexing agent) can make the intensity of ground and cement grout isogel body mixture reach original more than 3 times at 24 hours, thereby the geotechnical body that is reinforced with supporting is strengthened fast;

By the fast anchor of special use, in 24 hours, can apply pre-anchoring force to dowel, by the pre-anchoring force of 80KN to 240KN, it is whole that the geotechnical body that is reinforced is formed in the anchoring scope, increases its intensity and bearing capacity.

2, become the multi-direction anchor pile structure of diameter

The layering of ground with divide long-pending feature into, making should be targeted when it is reinforced, facility by stirring, churning or rotary jet stirring, gunite isogel material, in the rock-soil layer of weakness, form the oblique pile body of major diameter that mixes with ground, in the rock-soil layer of higher-strength, form the oblique pile body of minor diameter mix with ground, thus the oblique or level that forms a complete change diameter to or the anchoring pile of vertical direction add solid.Reached the target that reduces reinforcement cost, improves reinforcing efficient.

Forming the oblique pile body diameter that mixes with ground in the weak rocks soil body can be between the 400mm to 1200mm.

The supporting and protection structure of using this oblique anchoring pile body to be formed, can replace diaphragm wall, piling wall and piled anchor structure etc. commonly used in the deep foundation pit support fully, and with the interior support cancel all that conventional pattern foundation pit supporting structure uses, have safety, economy, convenient construction and reduction of erection time, to advantages such as little, the suitable different soil of surrounding enviroment influence.In addition, the reinforcing of this oblique anchoring pile body and supporting scope are not limited by foundation depth, the tool extensive applicability.Reinforcing and supporting that this oblique anchoring pile body is used for subterranean tunnel or underground passage can replace reinforced concrete wall commonly used and metallic support, have advantages such as construction safety, convenience, economy and reduction of erection time.

Four, description of drawings

(body matter)

Fig. 1 becomes the structure chart of the oblique anchor pile of diameter

Gelling agents such as 1-ground and cement paste mix the pile body that forms; The connector of 2-dowel and anchor ingot plate; The 3-dowel; 4-turns large diameter pile body; 5-reinforces the boundary line of ground; The termination backing plate of 6-anchoring pile; 7-loads the anchor ingot plate of two dowels; The 8-ground tackle.

Five, the specific embodiment:

(1), ground is by the oblique pile body forming method of the reducing of quick anchoring

(1) determines drilling method by the direction of designing requirement (level, oblique or with vertical);

(2) with the broken weak ground of rotary cutting mode;

(3) go into gel by the drilling rod pressure injection, gel can be: cement paste, lime mortar, chemical gelling agent, cement mortar etc.;

(4) go into the gelling slurries by the nozzle spray on the drill bit;

(5) while stirring spray;

(6) rotary speed of variation injection pressure and drill bit and reciprocal time;

(7) drill bit moves back and forth, the long and stake footpath up to the stake that reaches design;

(2), become the forming method of diameter anchoring pile

The bore by changing injection pressure, spray mouth and the speed and the spray technology of rotation, propelling, rollback on the position of determining, are controlled the stake footpath that forms, and can form the pile body of different-diameter, can repeatedly change stake directly on a pile.The oblique anchoring pile structure of change diameter as shown in Figure 1.The stake footpath scope of moulding at 400mm between the 1200mm.

Utilize the special-purpose drill bit that stirs,, reach reducing by changing direction of rotation.

(3), the job practices of the fast anchor of reinforcement

(1), the fast anchor of back reinforcement: the drill bit with rotary drilling forms the oblique pile body that becomes diameter in the ground of weakness earlier, moves back drilling bore hole, den bohrkopf abbauen.The dowel that will have anchor head then is contained in the front end of drilling rod, and the central axis along pile body pushes into steel hinge line in the pile body by drilling rod.When reaching the stake end, withdraw from drilling rod, simultaneously along the inside mud jacking of drilling rod, the steel strand that can will have anchor head are embedded in the anchoring body.For muddy soft soil, form oblique pile body by churning earlier, manually insert anchoring piece then.

(2) the fast anchor of disposable reinforcement: adopt the disposable drill bit have quick anchoring spare, on one side rotary jet stirring form the oblique pile body that becomes diameter, simultaneously steel hinge line is brought in the pile body.When reaching the anchor pile end, reverse rotation can be withdrawed from drilling rod, while withdraw from inwardly mud jacking of drilling rod with drilling rod simultaneously, the anchoring piece that has disposable drill bit is embedded to the oblique stirring anchoring pile body that this becomes diameter.

Claims

Pass through special-purpose machines and tools, rotating stirring by the direction of design in the weak rocks soil layer creeps into, cementitious material such as the cement paste of spray are simultaneously fully mixed with the geotechnical body that is cut fragmentation, add fast strong agent simultaneously, rotary speed, churning pressure are stirred in control, add special-purpose muscle firmware and form an oblique anchoring body that becomes diameter.By fast anchor, make the broken ground mixture of dowel material and formed cement tight bond together, produce better anchoring force fast.Injection rate by gels such as control injection pressure, rate of penetration, cement pastes forms the oblique anchoring pile body that becomes diameter in different weak ground.

The claim of patent of the present invention:

1, the method for weak rocks soil body quick anchoring

In weakness, the kata-rocks soil body, by the facility of stirring, churning or rotary jet stirring, cement grout isogel material is mixed gluing with geotechnical body, add special-purpose fast strong agent, with quick anchoring spare, can make the weak rocks soil body by the effect of quick anchoring and its globality of raising.

2, become the structure of diameter multi-direction anchor pile

At different soil layer characteristics, in the weak rocks soil body, form change diameter multidirectional (level, the vertical and oblique) anchor pile that cement paste mixes with ground, become diameter range between 400mm to 1200mm.