CN103527087A - Impact holing method in cast-in-place construction method - Google Patents

Abstract

The invention discloses an impact holing method in a cast-in-place pile construction method. The impact holing method comprises the following steps of (a) hole center locating, (b) drilling machine in-place arranging, (c) cast-in-place pile hole forming, (d) permanent steel protection cylinder wall protection and (e) drilling checking and accepting. According to the impact holing method, a down-the-hole hammer eccentric drilling with casing technology is adopted, a traditional holing operation mechanism is changed, the drilling efficiency is greatly improved, and precious time for follow-up work of reinforcement cage placing and cast-in-place pile casting are obtained. Meanwhile, the impact holing method in the cast-in-place pile construction method is easy to realize, high in practicability, high in applicability and applicable to pile foundation construction work, of basic processing projects such as cast-in-place pile hole forming, in the engineering construction industry in various environments and under the geological conditions of rock block layers, concrete scale gravel-cobble layers, slide rock layers, quick sand layers and the like which are large in burial depth and cannot be processed by adopting a common method effectively.

Description

Impact holing method in filling pile construction engineering method

Technical field

The present invention relates to impact holing method in filling pile construction engineering method.

Background technology

Along with improving constantly of scientific and technological level, the solution of the most of troublesome zone drilling difficult problem that people run into engineering construction field has had better, reliable technical support, down-hole hammer eccentric is with the progress of pipe drilling technology, give filling pile construction technical staff author, to society, brought Gospel.

Castinplace pile pore-creating in thicker block stone layer under morning and evening tides environment (> 2m), coagulation dirt is a difficult problem for construction always, quick washing pore-creating filling pile construction is that we are based upon on the basis of down-hole hammer eccentric with pipe drilling technology, a kind of construction with features such as equipment are light, quick, economic, efficient having.At morning and evening tides environment, in groynes work progress, adopt traditional construction drill technique mostly to adopt with methods such as pipe, percussive grabbing borings, have that speed of application is slow, efficiency is low, construction quality is difficult to the difficult problems such as assurance, can not finely meet requirement of engineering, and there is limitation in varying degrees.

Summary of the invention

The object of the present invention is to provide impact holing method in filling pile construction engineering method.

The present invention adopts following technical scheme:

Impact holing method in filling pile construction engineering method, is characterized in that comprising the steps:

(a) hole heart location: surveyor is according to drawing and detailed observation and analysis on the spot, utilize measurement control point that owner provides and the correlation between this engineering coordinate, calculate the angle and distance of measuring between dominating pair of vertices engineering coordinate, then adopt transit to control, carry out the setting of this engineering control pile;

(b) rig is in place: rig, is accurately being located by suspention plumb line by rail moving near the heart anchor point of hole;

(c) castinplace pile pore-creating: first locate according to drawing of engineering design the position of portalling, then mobile drill puts in place, utilize spirit level to adjust rig, after rig is firm, at scope of operation top layer down-hole hammer eccentric casing drilling tools, creep into until 1m, drilling process blast is according to circumstances adjusted at any time, maintain 0.8Mpa, with capable of adjusting after pipe two joints, be depressed into 1.1Mpa, along with formation variation capable of regulating the pressure of the drill; Impact holing, steel sleeve is pressed 1.5m mono-joint and is prepared in advance, and can be arranged on rig, with pore-forming progress, follow up, sleeve pipe and sleeve pipe are taken over and are adopted silk muzzle to connect, and guarantee its bonding strength simultaneously, when pore-forming is to projected depth, propose drilling tool, boring finishes, and carries out follow-up reinforcing cage installation and concrete pouring at once;

(d) permanent steel cylinder-wall protecting: by lifting appliance, first sleeve pipe placed position of opening, all the other sleeve hoistings are to first sleeve pipe top, and the silk mouthful that is connected between sleeve pipe connects, and manually coordinates chain wrench to install;

(e) boring is checked and accepted: until drill hole of drilling machine, during to design elevation, after staff's self check is qualified, written notice is managed and owner carries out the examination of whole hole.

The present invention, owing to having adopted technique scheme, has following beneficial effect:

In this filling pile construction engineering method, impact holing method adopts down-hole hammer eccentric to change traditional pore-forming operation mechanism with pipe drilling technology, has greatly improved the efficiency of creeping into, and lays building of reinforcing cage, castinplace pile won the valuable time for follow-up work.Solve filling pile construction block stone layer in thicker block stone layer under water (> 2m) Qiantang River thick; the groynes of complicated geology and the jackstone repeatedly pool section of speedily carrying out rescue work; can shorten the construction period largely; by adopting steel wall sleeve; pile foundation is played to permanent protective effect, reduce the maintenance cost of the generation weathering because of dam body.This construction is simple easily to be realized, practical, there is stronger applicability, be applicable in various environment, for the larger block stone layer of buried depth, coagulation dirt gravel layer, diluvial layer, drifting sand layer etc., cannot effectively adopt under the geological conditions of conventional way processing, carry out the pile foundation construction engineering of the engineering construction industry of the based process projects such as castinplace pile pore-creating.

The specific embodiment

Impact holing method in filling pile construction engineering method of the present invention, comprises the steps:

(a) hole heart location: surveyor is according to drawing and detailed observation and analysis on the spot, utilize measurement control point that owner provides and the correlation between this engineering coordinate, calculate the angle and distance of measuring between dominating pair of vertices engineering coordinate, then adopt transit to control, carry out the setting of this engineering control pile.

(b) rig is in place: rig, is accurately being located by suspention plumb line by rail moving near the heart anchor point of hole.

(c) castinplace pile pore-creating: first locate according to drawing of engineering design the position of portalling, then mobile drill puts in place, utilize spirit level to adjust rig, after rig is firm, at scope of operation top layer down-hole hammer eccentric casing drilling tools, creep into until 1m, drilling process blast is according to circumstances adjusted at any time, substantially maintain 0.8Mpa, the general rear capable of adjusting of pipe two joint of following is depressed into 1.1Mpa left and right, along with formation variation capable of regulating the pressure of the drill.Impact holing, steel sleeve is pressed 1.5m left and right one joint and is prepared in advance, and can be arranged on rig, with pore-forming progress, follow up, sleeve pipe and sleeve pipe are taken over and are adopted silk muzzle to connect, and guarantee its bonding strength simultaneously, when pore-forming is to projected depth, propose drilling tool, boring finishes, and carries out follow-up reinforcing cage installation and concrete pouring at once.

This engineering driller drilling depth 3m/h left and right (comprise and remove drilling rod and manually take over the time), according to design hole depth, the large every pile of flood tide need divide two tides to complete.Little flood tide can be worked continuously, substantially can a damp injection one.

(d) permanent steel cylinder-wall protecting: by lifting appliance, first sleeve pipe (containing gumshoe) placed position of opening, all the other sleeve hoistings are to first sleeve pipe top, and the silk mouthful that is connected between sleeve pipe connects, and manually coordinates chain wrench to install.

(e) boring is checked and accepted: until drill hole of drilling machine, during to design elevation, after staff's self check is qualified, written notice is managed and owner carries out the examination of whole hole.

Material and facility:

1, timbering material

This engineering driller support adopts φ 48 * 3.5 steel pipes, and fastener type steel pipe scaffold, is comprised of fastener, vertical rod, cross bar, bearing.Steel pipe is 1.2m bidirectional arrangements in length and breadth, and two edge-only have diagonal brace and bridging for keeping out the side impacting force of tidewater.

2, commercial concrete

Because the concrete amount of building a flood tide phase is little, consider the economy of product, therefore adopt commercial concrete, strength grade is C30, has workability, and its match ratio should be determined by experiment, the slump is preferably 180-220mm, and the consumption of cement should not be less than 360kg/m3.The sand factor of underwater concreting is preferably 40%-50%, and selects medium coarse sand, and the maximum particle diameter of coarse aggregate should be less than 40mm.

3, conduit

The wall thickness of conduit is not less than 3mm, and diameter is preferably 220-260mm, and the deviation that diameter is made should not surpass 2mm, and the visual technological requirement of merogenesis length of conduit is definite, and bottom tube length should not be less than 4m, and joint should adopt the button snap joint of two screw thread sides.Will take an entrance examination before conduit uses assembled, pressure testing, water pressure testing power can be taken as 0.6-1.0Mpa.After each perfusion to cleaning inside and outside conduit.

4, permanent pipe casing

Shock-resistant and light, economic dispatch feature that the selection of sleeve pipe is generally followed needs to meet the requirements such as yield strength, compressive strength simultaneously.Yield strength >=the 390Mpa of general geology sleeve pipe (as: DZ40), tensile strength >=680Mpa, and aperture is substantially in 168 left and right, is widely used in geological prospecting.This construction mesoporous is 426, much larger than common geological casing pipe 168 apertures, therefore sleeve pipe material and heat treatment performance are had relatively high expectations, especially the material of shoe, general geology sleeve pipe (as 168) adopts 40CrMnMo(DZ40) high-strength material, choosing material is R780 geological casing pipe (surrender >=520Mpa customized, tension >=780Mpa), wall thickness is 10mm, and the silk mouthful high-quality quenching heat treatment of process, thereby in case cause casing failure owing to being subject to the uneven inclined hole that occurs of outside stratum frictional resistance and bit force in boring procedure, once because there is the disconnected event of running affairs, bottom sleeve need be extracted and perforate again totally, wasting manpower and material resources.

5, drilling rod

The selection of drilling rod is relatively simple, mainly to consider its intensity, existing market mainly contains two kinds of φ 73 and φ 89, first adopt φ 89 drilling rods as test, drill rod breaking (fracture cause is mainly that impactor and off-balance bit weight are larger, ruptures after working long hours in drilling rod weak link) when test injection; After select φ 127 drilling rods, this rod body material is also R780(surrender >=520Mpa, tension >=780Mpa), for preventing that drilling rod and rig binding site from rupturing because rotation produces torsion, during construction, at this position, add proper welding, substantially can meet and use needs.

Quality control:

1, reinforced bar engineering quality assurance measure

The entering of reinforcing steel bar should extract in accordance with regulations test specimen and make mechanical properties test.Steel bar quality must meet following requirement: (1) outward appearance is straight, not damaged, surface must not have crackle, greasy dirt and embroidery line; (2) possess product certificate, label; (3) yield strength, cold-bending property, tensile strength etc. meet the demands.

During reinforcement installation, the kind of steel bar stress, rank, specification and quantity must meet working drawing requirement.

2, drilling quality is controlled

2.1, personnel control

Rig operating personnel can make adjustment in the face of complicated geographical environment in time at actual mechanical process, avoid occurring the accidents such as bit freezing, disconnected hole, inclined hole, therefore higher to mechanically actuated personnel's operation competency profiling.

2.2, control of material

Before work, conscientiously check that whether impactor work is normal, whether eccentric drilling device opens, draws in flexible.Whether connecting pin and retaining mechanism be firm, and whether the size of shoe and eccentric drilling device mates, and whether each connecting portion is reliable.

2.3, machinery is controlled

While spudding in, be not first with casing drilling 1-2m(for enter to provide location and guide effect with pipe bit), then propose drilling tool, the more first sleeve pipe with gumshoe put into hole, drilling tool is put into gumshoe, checks that each position follows pipe bit to enter after working properly.

In drilling process, according to strata condition, often creeping into certain depth will carry and creep into row deslagging, after unimpeded in hole, can continue to creep into, forbid to creep into for a long time and do not carry brill deslagging, can cause like this boring to be stopped up, can occur again the telescopic section of drilling tool and eccentric rotating part by rock slag, blocked and work undesired.Bit freezing once there is lock of tool drilling, need can continue down injection and strengthen blast and blow slag according to actual conditions, if still can only together be extracted sleeve pipe and drilling tool.The drilling process drilling tool that can't reverse by force, in order to avoid off-balance bit draws in, does not have reaming effect.

Along with boring is deepened, limit to add drilling rod limit and add sleeve pipe, in this process, to check that whether the connection of screw thread reliable, so as not to when creep into because impact produces disconnection.

Complicated for geologic structure, superstructure is block stone layer, when bottom is soil layer construction, this drilling tool also blockage phenomenon in soil layer drilling process, meeting this situation can blow out mud injecting in hole after a certain amount of water in the pressure of blowing under the percussion of blast and water, continues construction.

These are only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this.Anyly take the present invention as basis, for solving essentially identical technical problem, realize essentially identical technique effect, done ground simple change, be equal to and replace or modification etc., be all covered by among protection scope of the present invention.

Claims (1)

1. impact holing method in filling pile construction engineering method, is characterized in that comprising the steps:

(a) hole heart location: surveyor is according to drawing and detailed observation and analysis on the spot, utilize measurement control point that owner provides and the correlation between this engineering coordinate, calculate the angle and distance of measuring between dominating pair of vertices engineering coordinate, then adopt transit to control, carry out the setting of this engineering control pile;

(b) rig is in place: rig, is accurately being located by suspention plumb line by rail moving near the heart anchor point of hole;

(c) castinplace pile pore-creating: first locate according to drawing of engineering design the position of portalling, then mobile drill puts in place, utilize spirit level to adjust rig, after rig is firm, at scope of operation top layer down-hole hammer eccentric casing drilling tools, creep into until 1m, drilling process blast is according to circumstances adjusted at any time, maintain 0.8Mpa, with capable of adjusting after pipe two joints, be depressed into 1.1Mpa, along with formation variation capable of regulating the pressure of the drill; Impact holing, steel sleeve is pressed 1.5m mono-joint and is prepared in advance, and can be arranged on rig, with pore-forming progress, follow up, sleeve pipe and sleeve pipe are taken over and are adopted silk muzzle to connect, and guarantee its bonding strength simultaneously, when pore-forming is to projected depth, propose drilling tool, boring finishes, and carries out follow-up reinforcing cage installation and concrete pouring at once;

(d) permanent steel cylinder-wall protecting: by lifting appliance, first sleeve pipe placed position of opening, all the other sleeve hoistings are to first sleeve pipe top, and the silk mouthful that is connected between sleeve pipe connects, and manually coordinates chain wrench to install;

(e) boring is checked and accepted: until drill hole of drilling machine, during to design elevation, after staff's self check is qualified, written notice is managed and owner carries out the examination of whole hole.