CN1306121C

CN1306121C - Method for pile foundation construction of geologic structure with flow plastic half-flow plastic and its application apparatus

Info

Publication number: CN1306121C
Application number: CNB2004100355132A
Authority: CN
Inventors: 陈佳训; 陈建业; 王亦德
Original assignee: 陈佳训
Priority date: 2004-08-05
Filing date: 2004-08-05
Publication date: 2007-03-21
Anticipated expiration: 2024-08-05
Also published as: CN1598165A

Abstract

The present invention relates to a method for pile foundation construction of geologic structures with flow plastics or half-flow plastics and an application apparatus thereof. The method comprises the prefabrication of a reinforcing cage-the positioning of a pile machine-the alignment of a position to be drilled-drilling for forming a hole-drilling to a height mark of a design requirement-the lift of a drill-the simultaneous pumping of pouring concrete in a central hole with the lift of the drill-the inverse insertion and the pressing of the reinforcing cage in a clean hole opening. In the working procedure of prefabricating the reinforcing cage; a material protective steel wire net layer is arranged on the periphery of the reinforcing cage within the range of a height mark of a silt layer; the aperture of each mesh of the material protective steel wire net layer is smaller than the particle diameter of concrete coarse aggregate. In the working procedure of inversely inserting and pressing in the reinforcing cage, the special reinforcing cage is used. The present invention has the advantages of simple and easy method, originality, effectiveness, economic and applicable apparatus, simple and easy preparation of an added member-a material protective steel wire net, no change of an original working procedure and a custom, no increase of processing time and cost basically, excellent cost performance ratio, easy adoption by construction companies, easy popularization and generalization, and the reduction of a construction period.

Description

There is stream to mould or pile base construction method and application apparatus thereof during the half-flow plastic geologic structure

Technical field

The invention belongs to Pile Foundations Design and construction technology category, especially having stream to mould or pile base construction method and application apparatus thereof during the half-flow plastic geologic structure.

Background technology

In Pile Foundations Design and construction, take all factors into consideration the factors such as geological conditions, superstructure situation, load type and ambient conditions of geotechnical engineering.

In the pile foundation construction engineering of the soil layer of geological conditionss such as general clay and fill stratum, powder soil horizon, thin burning into sand soil layer and general non-deadweight fall loess formation, because auger boring pumping of concrete bored cast-in-situ pile, system easy to control the quality, short construction period is the preferential constructure scheme that adopts of present insider.

Auger boring pumping of concrete castinplace pile is in pore-forming, it is the quick dry drill method of long screw drill rod that drives with a kind of high pulling torque unit head, most of soil is transported in rotary drilling on the blade of auger stem in the boring, soil is overstock densification and is formed an earth pillar with drilling rod when rising, only several millimeters in earth pillar and drilling rod gap are similar to a long-term job plug.Even phreatic stratum is being arranged, because of earth pillar is little with the boring gap, penetration rate is fast, ooze out in the boring and the water that accumulates seldom, do not influence concrete perfusion.The boring of drilling rod bottom is provided with one way valve, stop drilling rod revolution behind the drilling to completion, the pressure of chutable concrete that stir and deposit by pump is depressed into drill bit bottom, one-way valve opens at this moment, concrete extrudes and promotes drilling rod and rises, press full concrete in the hole, because hole inner accumulated pressure, and the swabbing action of drilling rod is arranged, help improving the bearing capacity of stake, insert reinforcing cage by designing requirement then, maintenance as usual, pile foundation construction is finished.

Auger boring pumping of concrete filling pile construction method, driven pile (precast concrete pile or piling bar) the construction method comparison with traditional has following tangible advantage:

1. job practices is simple, noiselessness, short construction period;

2. cost saving generally than the cost saving of concrete driven pile more than 30%, and is squeezed into piling bar and is compared cost saving more than 40～50%;

3. (building) structure of having built are not produced vibration influence on every side.

Auger boring pumping of concrete filling pile construction method, compare with traditional mud off or tube-sinking cast-in-situ pile and to have the following advantages:

1. simple for process, system easy to control the quality; Do not have mud to produce and bring pollution environment;

2. because concrete directly contacts with the soil layer of hole wall, improve bearing capacity about 20% with respect to the mud off method;

3. efficiency of construction doubles than mud off method, and saves the expense of retaining wall pulping and transportation slurry.

But the auger boring pumping of concrete filling pile construction method of prior art is still undesirable; For example, in the special circumstances of geotechnical engineering geology, for example, underground have mud or a thicker layer of sand, and this mud or layer of sand are in that stream is moulded or during the half-flow plastic state; Or in pond backfill, coastal area, particularly carry out on one side under the situation of (building) structure construction in one side backfill, because the shortage self of banketing of upper strata backfill is fixed, there is the mud that flows below again, new construction of structures is seated on the backfill, and the duration requires under the tight situation or the like, and construction is failure often.

The main cause of failure is: poured into concrete or counter insert reinforcing cage and constructed after, the chutable concrete that pours in the above stake of the absolute altitude hole at the bottom of the mud, because the mud pressure that the pressure of deadweight is moulded greater than stream, concrete occurs and run off in the mud of fluidised form, and absolute altitude the emptying aperture phenomenon occurs with top at the bottom of the mud that flows in the stake hole; Make the concrete pouring failure.

Summary of the invention

Goal of the invention of the present invention is to overcome above-mentioned defective, and designing is a kind ofly having stream to mould or pile base construction method and application apparatus thereof during the half-flow plastic geologic structure.When the geological conditions of the thicker plastic flow mud of underground existence (sand) layer, auger boring pumping of concrete filling pile construction method, but smooth construction still.

Goal of the invention of the present invention is implemented by following technical solution:

Developing a kind ofly has stream to mould or the pile base construction method during the half-flow plastic geologic structure, comprises that reinforcing cage prepares in advance, and---pile-forming machine perching---aims at and treats the boring position that---pore-forming spuds in, and---holing to the designing requirement absolute altitude,------centre bore pumping concrete perfusion when carrying brill---cleaning aperture that begins to carry brill is fallen to insert and is pressed into reinforcing cage; It is characterized in that:

At reinforcing cage preparation section in advance, the reinforcing cage periphery in mud absolute altitude scope is provided with protects the material steel screen layer, protects the aperture of material steel screen layer mesh, less than the particle diameter of concrete coarse aggregate;

Falling the slotting reinforcing cage operation that is pressed into, use in the reinforcing cage periphery and be provided with the special reinforcing cage of protecting the material steel screen layer.

Above-mentioned have stream to mould or the employed device of pile base construction method during the half-flow plastic geologic structure, comprises the reinforcing cage that is arranged in the hole concrete slurry, it is characterized in that described reinforcing cage arranged outside steel wire protects the material stratum reticulare;

Above-mentioned have a device that stream is moulded or the pile base construction method during the half-flow plastic geologic structure uses, and it is characterized in that described guarantor expects the mesh aperture of steel screen layer, less than the particle diameter of coarse aggregate in the perfusion concrete slurry;

Above-mentioned have a device that stream is moulded or the pile base construction method during the half-flow plastic geologic structure uses, and it is characterized in that described guarantor expects that steel screen layer is provided with height, greater than job site mud or layer of sand height.

Advantage of the present invention is:

1. method is simple and easy, unique, effective, and employed device, guarantees workmanship at economy, reduction of erection time; When being particularly useful for the geological conditions of the thicker plastic flow mud of underground existence (sand) layer;

2. the member of Zeng Jiaing---protect the material gauze wire cloth, the building site very easily obtains, and does not change original operation procedure and custom, does not increase man-hour and cost substantially; Ratio of performance to price excellence, unit in charge of construction is glad to adopt;

3. the inventive method simple and efficient, economy, the device of use is made simple and direct easy, a religion will, be easy to promote, popularize the reduction of erection time.

Description of drawings

Fig. 1 is the local enlarged diagram in structure of the present invention cross section;

Fig. 2 is the reinforcing cage structural representation of prior art;

Fig. 3 is " modified wire basket " of the present invention structural formula intention;

Fig. 4 is a conventional apparatus enforcement state contrast schematic diagram at the construction field (site);

Fig. 5 is that contrive equipment is implemented view at the construction field (site).

The specific embodiment

Among the figure, the 1st, the main muscle of reinforcing cage; The 2nd, the stirrup of reinforcing cage; The 3rd, the steel wire of reinforcing cage arranged outside is protected the material stratum reticulare; The 4th, pour into the coarse aggregate in the concrete slurry in the hole; The 5th, the concrete slurry that pours in the hole; The 6th, a hole; The 7th, the nature terrace; The 8th, the plain fill layer; The 9th, mud matter farinose argillic horizon; The 10th, farinose argillic horizon; The 11st, middle roving layer; The 12nd, argillic horizon; The 13rd, " coarse aggregate " that the reinforcing cage of prior art runs off in the stake hole is deposited in the state signal in the mud matter farinose argillic horizon 9.

Auger boring pumping of concrete castinplace pile is a technology commonly used in the pile foundation construction, short construction period, and quality is good.

The main construction techniques of prior art is: reinforcing cage prepares in advance, and---pile-forming machine perching is aimed at and treated the boring position, and---pore-forming spuds in, and---holing to the designing requirement absolute altitude,---anti-the inserting in---centre bore pumping concrete perfusion when carrying brill---cleaning aperture is pressed into reinforcing cage to begin to carry brill.

But, when bored pile runs into mobile mud at underground condition, when concrete perfusion finish or fall to insert be pressed into reinforcing cage after, in the past automatically flow in mud with the top concrete in initial set in the mud bottom, the phenomenon that the above concrete of absolute altitude sinks at the bottom of the mud occurs, sink to occur at most the emptying aperture phenomenon more than the absolute altitude at the bottom of the mud.

The present invention be fall to insert be pressed into reinforcing cage before, reinforcing cage arranged outside finer wire stratum reticulare in mud absolute altitude scope, the mesh aperture of steel screen layer is less than concrete coarse aggregate, the effect of steel screen layer is that the constraint coarse aggregate does not produce pressure to mud, prevent that coarse aggregate is lost in the mud, reach the purpose that nature fills the hole, guarantee the quality of concrete perfusion and make concrete grout in the concrete slurry flow to power such as the outside of steel screen layer and mud formation naturally.

In pile foundation construction, when running into that geological conditions is underground mud and thicker layer of sand, often bring very big difficulty to pile foundation construction, in adopting auger boring pumping of concrete castinplace pile, owing to exist the mud that flows often to make this job practices concrete perfusion failure, this geological conditions is in the pond backfill, the coastal area, particularly carry out on one side under the situation of (building) structure construction in one side backfill, because the shortage self of banketing of upper strata backfill is fixed, there is the mud that flows below again, new construction of structures is seated on the backfill, and the duration requires under the tight situation, since auger boring pumping of concrete system easy to control the quality, short construction period, if solve the mud perfusion concrete slurry problem that flows of passing that exists, this job practices is effective, economical, reduction of erection time.

The present invention is in auger boring pumping of concrete filling pile construction; after reinforcing cage has been made; at the fixing one deck finer wire net of reinforcing cage Outboard Sections height (geological conditions of inserting behind the reinforcing cage in the pressure pile hole is in the depth bounds of mud) colligation; anti-inserting is pressed into reinforcing cage behind the concrete perfusion; like this stake hole in the layer depth absolute altitude scope of mud; just there is one deck finer wire catch net in the reinforcing cage outside; this layer gauze wire cloth constrains in the coarse aggregate in the chutable concrete of cast in the catch net; do not produce pressure to mud; coarse aggregate just not can owing to the loss of pressure that self produces in mud; and the power such as mud that the pressure of fines and concrete grout and stream are moulded reach and protect material; pressurize makes the success of pile foundation concrete perfusion.

The present invention and prior art construction technology compare:

1, normal construction technology

(1) mobile drill is to the king-pile position, begin to creep into;

(2) by designing requirement assembling reinforcement cage;

(3) be drilled into designed elevation;

(4) when carrying brill, the centre bore pumping is pressed into concrete and directs at the aperture;

(5) propose and remove drilling rod, in the concrete of lifting steel reinforcement cage vibrations jacked pile hole.

2, construction technology of the present invention:

(1) mobile drill is to the king-pile position, begin to creep into;

(2) press the designing requirement colligation at steel reinforcement cage;

(3) in the increase of steel reinforcement cage (in the underground mobile mud absolute altitude scope) outside guarantor's material steel wire is set Layer;

(4) be drilled into designed elevation;

(5) when carrying brill, the centre bore pumping is pressed into concrete and directs at the aperture;

(6) propose and remove drilling rod, lifting increases in the reinforcing cage vibrations pressure pile hole concrete of protecting the material stratum reticulare.

Facts have proved that " coarse aggregate " in the construction in the concrete slurry do not run off, guaranteed construction speed and pile foundation engineering quality, reached the goal of the invention of expection satisfactorily.Society, remarkable in economical benefits.

Claims

1. one kind has stream to mould or the pile base construction method during the half-flow plastic geologic structure, comprises that reinforcing cage prepares in advance, and---pile-forming machine perching---aims at and treats the boring position that---pore-forming spuds in, and---holing to the designing requirement absolute altitude,------centre bore pumping concrete perfusion when carrying brill---cleaning aperture that begins to carry brill is fallen to insert and is pressed into reinforcing cage;

It is characterized in that:

2. there is stream to mould or the employed device of pile base construction method during the half-flow plastic geologic structure according to claim 1 is described, comprise the reinforcing cage that is arranged in the hole concrete slurry, it is characterized in that: the reinforcing cage periphery in mud or sand bed absolute altitude scope is provided with protects the material steel screen layer, steel wire is protected the mesh aperture of material stratum reticulare, less than the particle diameter of coarse aggregate in the perfusion concrete slurry.

3. according to claim 2 is described the device that stream is moulded or pile base construction method during the half-flow plastic geologic structure uses arranged, it is characterized in that described guarantor expects that steel screen layer is provided with height, greater than job site mud or layer of sand height.