CN104963347A - Foundation pit waist beam steel pipe tape support-changing construction method - Google Patents
Foundation pit waist beam steel pipe tape support-changing construction method Download PDFInfo
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- CN104963347A CN104963347A CN201510426487.4A CN201510426487A CN104963347A CN 104963347 A CN104963347 A CN 104963347A CN 201510426487 A CN201510426487 A CN 201510426487A CN 104963347 A CN104963347 A CN 104963347A
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Abstract
The invention relates to a foundation pit waist beam steel pipe tape support-changing construction method. The method comprises the following steps that 1, a formwork is erected on a ground floor slab, a post-cast strip is reserved, a steel pipe 500 with the diameter phi being 48 mm and the wall thickness being 3.5 mm is embedded along the post-cast strip, and the two ends are anchored into floorslabs on the two sides of the post-cast strip by 250 mm; 2, ground floor slab concrete is poured; 3, when the ground floor slab concrete reaches the 80% strength, a waist beam is disassembled by adopting static blasting or manual removal. By the adoption of the method, support changing is performed on horizontal stress after the inner supporting waist beam is disassembled, safety of the foundation pit and normal construction of a basement are ensured, the construction period is much shorter than that of a concrete beam type or full-panel type, joint project limit is achieved on schedule, meanwhile, the material cost and consumption are greatly lowered, and obvious economic benefits are obtained; the steel pipe consumes few materials, the technology is simple and convenient to implement, the cost is low, and the cost is 10% lower than that of other structural steel; the cost of the steel pipe tape support-changing is 10% lower than that of full-panel type support-changing, and according to comprehensive comparison, the total support-changing cost is lowered by 20%.
Description
Technical field
The present invention relates to the inner support system in a kind of foundation pit supporting project, especially a kind of foundation ditch waist rail steel pipe band support replacement construction method.
Background technology
Inner support system is applied in foundation pit supporting project of being everlasting as common support form.It is a kind of easy cambic inner support system that anchor pole adds foundation ditch waist rail, along with the rising of structure, original waist rail system just becomes the retardance that structure rises, and this provisional support system will be removed comprehensively, support pattern must be changed in time, so that construction is carried out smoothly.The conventional full transfer slab of general waist rail inner support conversion, waist rail is born internal force and is transmitted to base plate, but this conversion regime cost is high, technique relative complex.
The conversion of waist rail plate-belt type inner support has by space constraint less, and operation is simple, and the engineering time is short, and spillage of material is low, and construction quality is good, and conversion effect is obviously reliable, does not affect the features such as other the work items construction.Guangzhou adopts after change Lay mattress water bank whose foundation pit waist rail detaching to be buried steel pipe band underground in structure base slab ater-casting and carries out support replacement power transmission to base plate.Features simple and practical process, cost is lower, achieves good economic benefits and social benefit.Engineering method is formed through summing up.
Summary of the invention
The present invention will provide a kind of foundation ditch waist rail steel pipe band support replacement construction method, horizontal stress after dismounting inner support waist rail is made to carry out support replacement, ensure the safety of foundation ditch and the normal construction of basement, construction period compares concrete beam-type, comprehensively board-likely greatly to shorten, the node duration realizes as scheduled, and material cost and loss simultaneously reduces all greatly, achieves obvious economic benefit.
Technical scheme of the present invention is: a kind of foundation ditch waist rail steel pipe band support replacement construction method, and concrete steps are as follows:
1) B1 floor slab formerecting, reserved ater-casting, buries underground along ater-casting
wall thickness 3.5mm steel pipe@500, two ends respectively anchor into both sides, ater-casting floor 250mm;
2) B1 floorslab concrete is poured into a mould;
3), when B1 floorslab concrete reaches 80% intensity, adopt static(al) explosion or manually abolish dismounting waist rail.
Support replacement place, described ater-casting preformed plate reinforcing bar, waters after concrete, and waist rail has been built together with next structure of ground.
During B1 base plate steel bar binding, need by pre-buried for steel pipe to ater-casting plate midline position, and adopt Φ 18mm reinforcing bar by steel pipe with indulge muscle at the bottom of plate and weld, fix steel pipe.
Next room bottom slab concreting local terminates and all reaches design strength, and the closely knit backfill of basement periphery, can remove waist rail.
When waist rail abolishes construction, set up round log and support under waist rail, for ensureing the resistance to overturning of round log, round log adopts steel pipe to carry out drawknot.
The invention has the beneficial effects as follows:
The present invention is by taking a series of technical measures, horizontal stress after dismounting inner support waist rail is made to carry out support replacement, ensure the safety of foundation ditch and the normal construction of basement, construction period compares concrete beam-type, comprehensively board-likely greatly to shorten, the node duration realizes as scheduled, and material cost and loss simultaneously reduces all greatly, achieves obvious economic benefit.Steel pipe material, simple process, cost is low, lower by 10% than other shaped steel of use (channel-section steel, H profile steel, angle steel); Steel pipe band support replacement is lower by 10% than comprehensive board-like support replacement cost.Integrated comparative, total support replacement cost reduces by 20%.
Accompanying drawing explanation
Fig. 1 is anchor cable sectional drawing;
Fig. 2 is ater-casting embedded steel tube section.
Detailed description of the invention
A kind of foundation ditch waist rail steel pipe band support replacement construction method, concrete steps are as follows:
1) B1 floor slab formerecting, reserved ater-casting, buries underground along ater-casting
wall thickness 3.5mm steel pipe@500, two ends respectively anchor into both sides, ater-casting floor 250mm.(attached calculated description)
2) B1 floorslab concrete is poured into a mould.
3), when B1 floorslab concrete reaches 80% intensity, start to remove waist rail.Static(al) explosion can be adopted according to actual conditions, manually the method such as to abolish.
The facility material equipment that the present invention adopts:
1) facility: hydraulic breaking hammer, tower crane, operation car, extension arm digging machine, loader, oxygen welding electric welding machine
2) material: steel plate: steel tube end part pre-embedded steel slab
Φ 48 × 3.5 steel pipe: ater-casting power transmission, operation, security protection support body are set up
Wood springboard, Dense mesh screen: security protection
Acetylene: reinforcing bar cuts
Oxygen: reinforcing bar cuts
Welding rod: welding
Support replacement place, ater-casting slab muscle is reserved, and water after concrete, beam has been built together with this Rotating fields.Position, ater-casting reinforcing bar does not allow disconnection, during beam slab (B1 base plate) reinforcing bar binding of two layers, underground, and need by pre-buried for steel pipe to ater-casting plate midline position.Adopt Φ 18 reinforcing bar by steel pipe with indulge muscle at the bottom of plate and weld, fix steel pipe.
Treat that next room bottom slab concreting of ground terminates and all reaches design strength, the closely knit backfill of basement periphery, can remove waist rail.
Carrying out waist rail when abolishing construction, set up round log and support under waist rail, is the resistance to overturning ensureing round log, and round log adopts steel pipe to carry out drawknot.
This system is for bearing deadweight and the top live load of waist rail.Then carry out the concrete demolition reduction of this region waist rail, reduce the disturbing influence to soldier pile when waist rail is abolished.When guaranteeing that waist rail is abolished, waist rail is not overall falls.
Calculated description (support replacement checking computations)
1, calculation of pressure
According to design drawing, cable interval 24000mm, altogether 220/2.4=92 root, uplift resistance design average is 400KN, and it is 36800KN that waist rail supports maximum internal force.
Power transmission steel pipe arrangement pitch 500mm is strengthened in negative one deck ater-casting, ater-casting total length 170 meters.
Then steel pipe radical (170000/500+1)=341 piece
The stressed F=36800/341=108KN of every root.
2, compressive resistance calculates
Look into steel pipe parameter list, material Q235, nominal diameter DN50, the steel pipe parameter of wall thickness 3:
Moment of inertia I=4.591 × 10cm
4,
Bending resistant section coefficient (cross section resistance moment)=6.529cm
3,
I and W gets its minimum value I=1.861 × 10cm
4,
Steel Q235 elastic modulus E=200GPa
The value of length factor μ, length factor is relevant with the constraints at depression bar two ends, that is:
Two ends are fixed: μ=0.5
It is hinged that one end is fixed in one end: μ=0.7
Two ends are hinged, μ=1
One end is fixed freely in one end, μ=2
Because this engineering two ends are fixed, then its length factor value is μ=0.5
Can be obtained by Eular crippling stress formula:
P＝π
2EI/(2μ)
2＝π
2×200×10
9×1.861×10×10
-8/(0.5×2)
2
＝350KN,
3, safety factor for compressive stress
K＝P/F＝350/108＝3.24>1.2
Therefore through checking computations, bury steel pipe support in ater-casting underground and meet support replacement force request!
Technological principle of the present invention:
Waist rail is the reinforced concrete beam being arranged on foundation pit supporting construction middle and upper part (between B1 base plate to foundation ditch top) transferring structure and anchor pole fulcrum power.When foundation ditch wall descends outdoor wall closely, after the construction of underground two-layer structure, the waist rail protruding from foundation ditch wall 350mm hinders the construction of B1, must remove.The load that before removing, reply waist rail bears carries out support replacement power transmission.Now, B1 construction of bottom plates is complete, and leaves ater-casting, waist rail can be forced through and hand over band position to bury steel pipe underground after B1 base plate, by steel pipe band, power is passed to base plate, then remove waist rail.
Feature of the present invention
1) steel pipe band, the power transmission of floor support replacement are stablized;
2) steel pipe material, simple process, cost is low, lower by 20% than other shaped steel of use (channel-section steel, H profile steel, angle steel);
3) section construction, raises labour efficiency.Requirement construction plant is little, and efficiency of construction is high;
4) factor such as the technique of constructing, equipment, labour is relatively simple and easy compared with other measures.
Quality control on construction of the present invention:
1. quality specifications
This engineering, except meeting design drawing and constructure scheme, also must observe the pertinent regulations of " concrete structure engineering construction quality accident specification " (gb50204-2002):
2. quality assurance measure
1) reinforcing bar must have product certificate and test report, and through spot sampling check, just uses through being up to the standards.
2) remove the earth foreign material of the supporting pile body of clean support replacement Board position, make support replacement plate and soldier pile compact siro spinning technology.
3) reinforcement installation is complete carries out concealment acceptance, qualified ability concreting by inspection.
4) leave and take cured under same condition concrete sample, at cured under same condition test specimen, pressure testing reaches the waist rail that more than 80% of design strength just removes corresponding site.
3. to the construction of the dark beam of each road plate-belt type supporting member, itself and soldier pile energy tight union must be ensured, to guarantee that dark beam can play balanced effect of transmitting stress.
4. labor organization
Plate-belt type supporting member working procedure overlap joint closely, need each relevant professional workers coordinative construction, the work post that the construction of this engineering method is formed mainly contains: cutter lapicide, scaffolder, clinkerer, form fixer, bar bender, concreter, electric welder, electrician, waterproofer, digger, general labourer etc.Concrete number is depending on engineering size.
5. safety measure
(1) be responsible for grabbing trouble free service by the person in charge of the project mainlying grasp workmanship safety.Formulate the peaceful production system of this project, carry out system of responsibility in safe production, formulate safety in production rewards and penalties, workers ' safety is produced and links up with economic interests.
(2) enter job site personnel must wear a safety helmet, constructor must be on duty through safety education training ability.
(3) must have sufficient light in foundation ditch, illuminating line answers frame below the floor of upper strata, and uses low voltage electrical equipment.
(4), when carrying out the construction of other operations under plate-belt type supporting member, vented exhaust work must be carried out, to ensure air circulation.
(5) special operation workers should through training and possessing job qualification certificate, can operation.
(6) when backfilling below plate-belt type supporting member, face limit and hole is more, establish and go along with sb. to guard him railing, special upper and lower helper will be provided with up and down.
6. environmental practice
(1) set up Environmental protection management system, set up site environment protection and civilized management organization, conscientiously implement country and local environmental regulation.
(2) strengthen transport earth-working vehicles and personal management, construction plant and road answer hard place, and often watering keeps clean, and access to the site arranges automobile-washing groove, and haulage vehicle will take Mulching methods, guarantees that urban environment is not contaminated.
(3) keep the sanitation of environment of construction area and living area, collect and process various life in time, produce rubbish, construction, sanitary sewage need just can enter municipal wastewater well after treatment.
(4) because noise during excavation and construction is comparatively large, so will strictly construct the regulation engineering time by local administrative department for construction, and in construction, sound insulation and noise reduction measure is taked.
Engineering example:
One, basic situation
Existing ground level-1.4 meters, the maximum cutting depth of foundation ditch 10.4 meters, substrate absolute altitude-11.1, rice, excavation of foundation pit area 7000 square metres, foundation ditch girth 350 linear meter(lin.m.).Pattern foundation pit supporting structure is sloping timbering, the slide pile anchor supporting.Prestress anchorage cable is fixed on the foundation ditch waist rail of-3.4 meters of absolute altitudes.As shown in Figure 1, waist rail 1 is the horizontal collar tie beam of steel concrete, 800*800, length 220 meters, cable interval 2400.
Basement totally 2 layers, outer wall of basement is close to a mask.After two layers, underground external wall construction completes, enter B1 construction of bottom plates.For preparing to B1 external wall construction, need in advance at B1 bottom plate rear pouring tape pre-buried layout power transmission steel pipe, as foundation ditch waist rail above position support replacement load transfering strip, to remove waist rail (waist rail outside wall outstanding 800, cannot construction outer wall).
Two, support replacement power transmission design mistake
After two layers, underground external wall construction completes, enter B1 construction of bottom plates.Prepare for giving B1 external wall construction, need in advance at B1 bottom plate rear pouring tape pre-buried layout power transmission steel pipe steel, together with negative one deck base plate, as foundation ditch waist rail above position support replacement load transfering strip, to remove waist rail (because waist rail is outside wall outstanding 800, cannot construction outer wall).
As calculated, bury underground along B1 bottom plate rear pouring tape and arrange DN65 wall thickness 3mm steel pipe 2 ,@500, two ends respectively anchor into both sides, ater-casting floor 250mm (Fig. 2).
Claims (5)
1. a foundation ditch waist rail steel pipe band support replacement construction method, it is characterized in that, concrete steps are as follows:
(1) B1 floor slab formerecting, reserved ater-casting, buries underground along ater-casting
wall thickness 3.5mm steel pipe@500, two ends respectively anchor into both sides, ater-casting floor 250mm;
(2) B1 floorslab concrete is poured into a mould;
(3), when B1 floorslab concrete reaches 80% intensity, adopt static(al) explosion or manually abolish dismounting waist rail.
2. foundation ditch waist rail steel pipe band support replacement construction method according to claim 1, is characterized in that: support replacement place, described ater-casting preformed plate reinforcing bar, waters after concrete, and waist rail has been built together with next structure of ground.
3. foundation ditch waist rail steel pipe band support replacement construction method according to claim 1, it is characterized in that: during B1 base plate steel bar binding, need by pre-buried for described steel pipe to ater-casting plate midline position, and adopt Φ 18mm reinforcing bar by described steel pipe with indulge muscle at the bottom of plate and weld, fix steel pipe.
4. foundation ditch waist rail steel pipe band support replacement construction method according to claim 1, is characterized in that: next room bottom slab concreting local terminates and all reaches design strength, and the closely knit backfill of basement periphery, can remove waist rail.
5. foundation ditch waist rail steel pipe band support replacement construction method according to claim 1, is characterized in that: when waist rail abolishes construction, sets up round log and support under waist rail, and for ensureing the resistance to overturning of round log, round log adopts steel pipe to carry out drawknot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510426487.4A CN104963347A (en) | 2015-07-20 | 2015-07-20 | Foundation pit waist beam steel pipe tape support-changing construction method |
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|---|---|---|---|
| CN201510426487.4A CN104963347A (en) | 2015-07-20 | 2015-07-20 | Foundation pit waist beam steel pipe tape support-changing construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836239A (en) * | 2017-03-13 | 2017-06-13 | 中国十七冶集团有限公司 | Deep basal pit drilling poured support stake horizontal steel tube support support replacement construction method |
| CN109403473A (en) * | 2018-10-31 | 2019-03-01 | 中建局集团建设发展有限公司 | The box shape steel structure formula load transfer device and its construction method of bottom plate rear pouring tape |
| CN110185043A (en) * | 2019-06-14 | 2019-08-30 | 中国十七冶集团有限公司 | A kind of deep foundation pit support inner support support replacement method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836239A (en) * | 2017-03-13 | 2017-06-13 | 中国十七冶集团有限公司 | Deep basal pit drilling poured support stake horizontal steel tube support support replacement construction method |
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| CN109403473A (en) * | 2018-10-31 | 2019-03-01 | 中建局集团建设发展有限公司 | The box shape steel structure formula load transfer device and its construction method of bottom plate rear pouring tape |
| CN110185043A (en) * | 2019-06-14 | 2019-08-30 | 中国十七冶集团有限公司 | A kind of deep foundation pit support inner support support replacement method |
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Application publication date: 20151007 |
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