CN104895092A - Method for using inner-support temporary latticed column as permanent structure column - Google Patents

Method for using inner-support temporary latticed column as permanent structure column Download PDF

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Publication number
CN104895092A
CN104895092A CN201510297618.3A CN201510297618A CN104895092A CN 104895092 A CN104895092 A CN 104895092A CN 201510297618 A CN201510297618 A CN 201510297618A CN 104895092 A CN104895092 A CN 104895092A
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column
concrete
lattice column
lattice
template
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CN104895092B (en
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叶海龙
程群
姚守涛
周璇
王生玉
管聪聪
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Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
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Sixth Construction Co Ltd of China Construction Fourth Engineering Division Co Ltd
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Abstract

The invention discloses a method for using an inner-support temporary latticed column as a permanent structure column. The method includes the design principle of latticed column and permanent structure column combination, standing column pile construction, structure column construction, structure column form board setting, and structure column concrete pouring. The method has the advantages the position of the inner-support temporary latticed column is allowed to coincide with that of the basement structure column during design, the inner-support temporary latticed column is not demounted after construction, and stress steel reinforcing bars are tied to the outer side of the latticed column and concrete is poured to allow the latticed column to serve as the basement structure column. By the method high in popularization value, existing basement space can be effectively utilized, construction period is shortened, construction resources are saved, and construction cost is lowered.

Description

The interim lattice column of a kind of inner support is used as the method for permanent structure post
Technical field
The present invention relates to the method that the interim lattice column of a kind of inner support is used as permanent structure post.
Background technology
Along with the development that modern architecture industry is maked rapid progress, the reduction day by day in urban architecture space impels urban architecture progressively to future developments such as complex structure, the utilizations of the increasing underground space.Because city proper building is dense, bring many retardances to the construction of building, be difficult to adopt traditional pattern construction.Therefore various support form is also at continuous development and improvement.It is wherein a kind of that fender post (wall) adds this support form of inner support.Due to its simple structure, stressed clear and definite, technology maturation, safe and reliable, particularly apply in or the foundation ditch that geological conditions is poor more complicated in surrounding enviroment very extensive in deep big foundation pit engineering.Inner support form generally has concrete support and bracing members, and along with the increase supporting span, generally all can arrange lattice column or concrete column in the stressed larger portion position of brace summer, any support column generally all can be removed after supporting task completes.Therefore cause the construction period longer, waste resource.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method that the interim lattice column of a kind of inner support is used as permanent structure post.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: against making the interim lattice column of internal support of foundation pit for the construction method of structural column, comprise the following steps:
One, the design principles that is combined with permanent structure post of lattice column
The lattice column of inner support is arranged on the position of basement structure post within the scope of internal support of foundation pit, meets the force status as the interim lattice column of inner support; After excavation of foundation pit, lattice column is as the stiffness reinforcing bar of permanent structure post, forms permanent structure post;
Stand column pile participates in engineering pile stressed, stand column pile is utilized as the Force Calculation rule of engineering pile by a clump of piles;
Two, stand column pile construction
To march into the arena measurement:
Support lattice column and locate mode lattice column all adopt batch production Product processing outside the venue; By consigned processing after designing requirement formulation single cross supervision & assessment, guarantee material and make quality and have every checking measure; The cross-post record provided according to owner and each stake point carry out checking measurement, through check errorless after fill in pile extension record; The place being beneficial to protection and setting-out on construction ground arranges surface traverse point, and according to plane delivery receiving stake record, setting-out goes out the plane coordinates of surface traverse point;
Drilling and forming hole, clear hole:
Every drilling depth 4 ~ 5m verifies once, and before more bit change or easily shrinkage cavity place all should be verified; Hole depth deviation ensures within ± 10cm; Sediment thickness is as the criterion with measured quantity behind the clear hole of second time, need be not more than 5cm;
The object in clear hole exchanges mud in hole, eliminates boring mud and precipitation, utilize the direct circulation system of pore-forming directly to carry out; Clear hole divides secondary to carry out, and first time, clear hole was carried out immediately after pore-forming; The clear hole of second time is carried out transferring after reinforcing cage and conduit install; Clear hole is terminated, and together with supervisor to hole depth, the situations such as sediment at the bottom of hole check, and fill in pore-forming receipt in time, and behind clear hole, planted agent pours into concrete half an hour;
Install reinforcing cage:
The lifting of stand column pile fabrication of reinforcing cage is with conventional bored pile pouring construction;
The installation of lattice column and verticality Bit andits control:
Lattice column adopts an automobile loop wheel machine to hang, and suspension centre is positioned at lattice column top; The fixing main muscle top of reinforcing cage part that adopts of lattice column bends up, and be welded and fixed with lattice column batten plate and angle steel, time fixing, lattice column must occupy reinforcing cage center;
In welding process, crane hangs lattice column all the time, avoids it stressed; Accurately should locate when shaped steel king-pile hangs, guarantee that stand column pile perpendicularity of lattice column controls 1/500 ~ 1/1000, centre deviation ± 5mm;
Underwater concrete irrigate:
In order to ensure concrete pouring quality during the pouring of stand column pile concrete, guaranteeing to enter the concrete of lattice column in stake and reaching designing requirement, a pile underwater concrete pouring technique should be taked; And adopt pumping concrete to construct;
Three, structural column construction
The technological process of structural column construction is as follows:
Cubic metre of earth smooth → cushion construction → line setting → draw hole → insertions reinforcing bar → cap construct → welds well word muscle (up and down respectively one) for locating stirrup → cover column tie-bar → vertical applied force muscle connection → bandage muscle → carry out next process on stem stem lattice column
Cap is constructed:
Adopt arch without beam, cap is set at lattice column and floor part, base plate Punching Shear problem can be solved; Reduce the effective span of base plate; Reduce seat shoulder bar; According to stressed different with structure, cap is divided into half cap structure, 3/4 cap structure, double capital structure, complete cap to construct four classes;
Stirrup is located:
On lattice column, well word muscle is welded according to post position; Carry out the main muscle of post after location stirrup is firm with the colligation of well word muscle to be connected;
Structural column stirrup can pass from the space between lattice column angle steel, when stirrup meet lattice column batten plate time, can punch on batten plate through, the aperture that batten plate punches is bar diameter+2mm;
Structural column Vertical bar connection:
Outside lattice column during Vertical bar connection, for ensureing programming and quality, bar diameter D >=Ф 20 in post, bar splice adopts straight thread compression sleeve to connect; In every layer of basement bottom board work progress, put into reinforcing bar at cap position lattice column surrounding electricity consumption drill hole, reinforcing bar insertion depth is from cap bottom 1m; To treat upper and lower two-layer pressed splice after soil excavation according to layout design and code requirement straight screw sleeve;
Lattice column is connected with basement roof:
Weld with basement roof junction the peg that specification is d=19, L=100 at lattice column, peg spacing is 100mm, increases the adhesion stress with floor by peg; Steel bracket under basement driving passage place arranges beam, steel bracket is connected by full weld with lattice column;
Lattice column is connected with first brace summer:
First one deck C10 concrete cushion is built at beam bottom pour mold when lattice column is connected with brace summer, bed course and lattice column junction arrange angle steel supporting plate, it is 12mm batten plate that lattice column and beam join the every elongated full weld in the limit two pieces of thickness in bottom, bore a hole along axis of support direction on lattice column top, aperture is bar diameter+2mm, weld 3 Φ 20 reinforcing bars, be connected with brace summer; Brace summer concreting cuts bottom concrete bed course after reaching structural strength;
Lattice column is when cap position is connected with beam reinforced steel bar, and beam reinforced steel bar is that the punching of lattice column crossover sites strengthens beam end cross section through lattice column through lattice column or bending reinforcing steel bar; Improve Nodes structural shear strength;
Four, structural column formwork erection
The construction technology of structural column formwork erection: erection column template → installation tie → Allah's bar or diagonal brace → template are checked and accepted
Structural column side template adopts 40 × 90 wooden a tree, used in making timber for boats as secondary back cord, and main back cord adopts Φ 48 × 3.0 laterally two steel pipe; Column template installs must brush aqueous demoulding agent; Carpenter should be carried out before formwork erection and turn over sample, column template is marked according to place domain number; Play template sideline according to floor during formwork erection, line ball is from bottom to top installed; Adjacent block template splicing position, adopts 40 × 90 jail, wooden a tree, used in making timber for boats back of the body a tree, used in making timber for boats top splicing edges; After column template is in place, required to be arranged in template according to formwork by 40 × 90 back of the body a tree, used in making timber for boats, wooden a tree, used in making timber for boats spacing should be uniformly distributed according to the template length of side, adopts the clamping of steel pipe anchor ear, tightens anchor ear screw rod 3 type card in time, can by template cross section tension 3 ~ 5mm when 3 type cards are reinforced; Require overall height messenger wire when column template installs, correct verticality, post and plate delivery position answer seat to starch;
Five, structural column concreting
Structural column has lattice column to affect due to post core, vibrates difficulty in the space of inserting between vibrating spear and lattice column, structural column two sides, maybe cannot vibrate and the concrete quality problem that produces for eliminating vibrating spear difficulty of vibrating; Stay at cap top and establish concreting hole, vibrate in employing lattice column+template is auxiliary outward vibrates to ensure concrete pouring quality;
After inner support of having constructed plate, first with steel brush cleaning lattice column iron rust, and adopt common Po32.5 portland cement to prepare plain-water slurry, then smear lattice column successively from top to bottom, thus avoid the corrosion of lattice column; During structural column concreting, 2 sleeve pipes are diagonally set at capital end, guarantee concrete pouring quality;
Concreting waters a small amount of clear water in first 30 minutes in template, template, lattice column, reinforcing bar is fully moistening, New-old concrete joint surface at the bottom of post first lays one deck and concrete with the sub-mortar of proportioning de-stone, and laying depth controls at 100mm, to eliminate " rotten " phenomenon;
Slump of marching into the arena controls between 180 ~ 200mm, for making concrete mix can enter less position, frame column space, for slump less or segregation situation, should stop using immediately;
Primary the building of concrete is no more than 50cm, and each concrete vibrating of building in height closely knit after can carry out next time concrete building; Concreting is to building from cap soffit 500mm place's stopping, and interval 1h, to make concrete settlement; Continue before concrete initial set to build residue position concrete;
Concrete is often put and is built time proper extension, controls, at 30 ~ 45s, to shake again after 10 ~ 20min; Final step concreting, concrete is after charging aperture blanking, and when vibrating, vibrating spear need insert 50mm in concreting in advance, builds to cap bottom surface, is removed by top laitance; Again concreting again, until Concrete Filled evenly after again vibrate, until closely knit; Because concrete shrinkage still can produce gap, therefore must and use slip casting method process;
In casting process, as found, concrete cannot be built and put in place, and tapping template finds large area cavity, stops concreting immediately, and stripping as early as possible, clear up with concreting; And rinse the concrete on reinforcing bar with water, ensure that reinforcing bar cleans unaffected.
As preferably, for underwater concrete irrigate, comprise following concrete steps:
(1) in lattice column, insert perfusion concrete conduit, carry out secondary pile hole cleaning; First carry out pile body underwater concrete pouring; In work progress, be responsible for concrete face rising testing and control by special messenger; When this part concrete is close to lattice column bottom surface, when reaching predetermined control absolute altitude, the insertion depth of conduit in concrete is controlled in adjustment well, and suitably reduces irrigation amount, make concrete face slowly increase, avoid producing the skew of lattice column bottom centre because water velocity is fast or producing top mark height displacement on lattice column;
(2) conduit and hopper is avoided to collide lattice column and cause the inclination of lattice column;
(3) when concrete pouring reaches design of pile top absolute altitude, and after ensureing that bleeding reaches design and regulation and stipulation height, stop concrete pouring, extract conduit section by section;
(4) control pouring concrete interface, prevent too high bolt is encased in concrete face from causing locating lattice column.
The invention has the beneficial effects as follows:
In the design stage just the position of inner support lattice column and basement structure post position located coincident, will not remove after inner support steel structure column has been constructed, by colligation steel bar stress outside lattice column, concreting, finally as basement structure post.The method can not only effectively utilize existing basement space, and can in work progress the reduction of erection time, save buildings and resources, reduce construction cost, there is very strong promotional value.
Detailed description of the invention
The present embodiment is a kind of method being used as permanent structure post with the interim lattice column of inner support, and concrete steps are as follows:
The design principles that 1 lattice column and permanent structure post and stand column pile are combined with engineering pile
The design principles that 1.1 lattice columns are combined with structural column:
The lattice column of inner support is arranged on the position of basement structure post in the scope of internal support of foundation pit, and Force Calculation is carried out to lattice column, the force status as the interim lattice column of inner support be met.Permanent structure post is used as to lattice column simultaneously and carries out Force Calculation, allow lattice column as the stiffness reinforcing bar of permanent structure post, meet the force status as permanent structure post.
The design principles that 1.2 stand column pile are combined with engineering pile:
It is stressed that stand column pile participates in the pile foundation of engineering pile, stand column pile utilized as the Force Calculation rule of engineering pile by a clump of piles, to reduce the quantity of engineering pile, reduce costs.
2 construction technology processes
Levelling of the land → measurement and positioning → clear hole → install reinforcing cage → lattice column lifting → lattice column correction → underwater concreting → lattice column of holing is shaping → and lattice column assembling reinforcement → lattice column installs template → lattice column concreting
3 stand column pile constructions
3.1, to march into the arena measurement
Support lattice column and locate mode lattice column all adopt batch production Product processing outside the venue.By consigned processing after the examination & verifications such as designing requirement formulation single cross management, guarantee material and make quality and have every checking measure.The cross-post record provided according to owner and each stake point carry out checking measurement, through check errorless after fill in pile extension record.The place being beneficial to protection and setting-out on construction ground arranges surface traverse point, and according to plane delivery receiving stake record, setting-out goes out the plane coordinates of surface traverse point.
3.2, drilling and forming hole, clear hole:
Every drilling depth 4 ~ 5m verifies once, and before more bit change or easily shrinkage cavity place all should be verified.Hole depth deviation ensures within ± 10cm.Sediment thickness is as the criterion with measured quantity behind the clear hole of second time, need be not more than 5cm.
The object in clear hole exchanges mud in hole, eliminates boring mud and precipitation, utilize the direct circulation system of pore-forming directly to carry out.Clear hole divides secondary to carry out, and first time, clear hole was carried out immediately after pore-forming.The clear hole of second time is carried out transferring after reinforcing cage and conduit install.Clear hole is terminated, and together with supervisor to hole depth, the situations such as sediment at the bottom of hole check, and fill in pore-forming receipt in time, and behind clear hole, planted agent pours into concrete half an hour.
3.3, install reinforcing cage
The lifting of stand column pile fabrication of reinforcing cage is with conventional bored pile pouring construction;
3.4, the installation of lattice column and verticality Bit andits control:
First reinforcing cage is installed, in advance on the ground by high-strength stay bolt or steel plate correction to connecting former merogenesis lattice column, be combined into overall lattice column, then by crane lattice column lifted and put in place.Requirement guarantees that stand column pile perpendicularity of lattice column controls 1/500 ~ 1/1000, centre deviation ± 5mm.
3.5, underwater concrete irrigate:
In order to ensure concrete pouring quality during the pouring of stand column pile concrete, guaranteeing to enter the concrete of lattice column in stake and reaching designing requirement, a pile underwater concrete pouring technique should be taked.And adopt pumping concrete to construct.
Concrete steps are as follows:
(1) in lattice column, insert perfusion concrete conduit, carry out secondary pile hole cleaning.First carry out pile body underwater concrete pouring.In work progress, be responsible for concrete face rising testing and control by special messenger.When this part concrete is close to lattice column bottom surface, when reaching predetermined control absolute altitude, the insertion depth of conduit in concrete is controlled in adjustment well, and suitably reduces irrigation amount, make concrete face slowly increase, avoid producing the skew of lattice column bottom centre because water velocity is fast or producing top mark height displacement on lattice column.
(2) conduit and hopper is avoided to collide lattice column and cause the inclination of lattice column.
(3) when concrete pouring reaches design of pile top absolute altitude, and after ensureing that bleeding reaches design and regulation and stipulation height, stop concrete pouring, extract conduit section by section.
(4) control pouring concrete interface, prevent too high bolt is encased in concrete face from causing locating lattice column.
(5) do not walk about to ensure that lattice column is stable, after concrete solidifies, should can loosen the correction set bolt on lattice column calibrated mount, location lattice column four connecting bolts, remove and remove calibrated mount.
4 structural column constructions
4.1, technological process:
Cubic metre of earth smooth → cushion construction → line setting → draw hole → insertions reinforcing bar → cap construct → welds well word muscle (up and down respectively one) for locating stirrup → cover column tie-bar → vertical applied force muscle connection → bandage muscle → carry out next process on stem stem lattice column
4.2, cap construction:
The present embodiment adopts arch without beam, arranges cap, can solve base plate Punching Shear problem at lattice column and floor part; Reduce the effective span of base plate; Reduce seat shoulder bar.According to stressed different with structure, cap is divided into half cap structure, 3/4 cap structure, double capital structure, complete cap to construct four classes.
4.3, stirrup location:
On lattice column, well word muscle is welded according to post position.Carry out the main muscle of post after location stirrup is firm with the colligation of well word muscle to be connected.
Structural column stirrup can pass from the space between lattice column angle steel, and when lattice column batten plate met by stirrup, can punch on batten plate (aperture is bar diameter+2mm) passes.
4.4, structural column Vertical bar connection
Outside lattice column during Vertical bar connection, for ensureing programming and quality, bar diameter D >=Ф 20 in post, bar splice adopts straight thread compression sleeve to connect.In every layer of basement bottom board work progress, put into reinforcing bar at cap position lattice column surrounding electricity consumption drill hole, reinforcing bar insertion depth is from cap bottom 1m.To treat upper and lower two-layer pressed splice after soil excavation according to layout design and code requirement straight screw sleeve.
4.5, lattice column is connected with basement roof
Lattice column and basement roof junction weld spacing on lattice column is the peg of 100mm, specification d=19, L=100.The adhesion stress with floor is increased by peg.Steel bracket under basement driving passage place arranges beam, steel bracket is connected by full weld with lattice column.
4.6, lattice column is connected with first brace summer
First one deck C10 concrete cushion is built at beam bottom pour mold when lattice column is connected with brace summer, bed course and lattice column junction arrange angle steel supporting plate, it is 12mm batten plate that lattice column and beam join the every elongated full weld in the limit two pieces of thickness in bottom, weld 3 Φ 20 reinforcing bars on lattice column top along axis of support direction perforation (aperture is bar diameter+2mm), be connected with brace summer.Brace summer concreting cuts bottom concrete bed course after reaching structural strength.
Lattice column is when cap position is connected with beam reinforced steel bar, and beam reinforced steel bar is that the punching of lattice column crossover sites strengthens beam end cross section through lattice column through lattice column or bending reinforcing steel bar.Improve Nodes structural shear strength.
5, structural column formwork erection
Structural column formwork erection construction technique: erection column template → installation tie → Allah's bar or diagonal brace → template are checked and accepted
Structural column side template adopts 40 × 90 wooden a tree, used in making timber for boats as secondary back cord, and main back cord adopts Φ 48 × 3.0 laterally two steel pipe.Column template installs must brush aqueous demoulding agent.Carpenter should be carried out before formwork erection and turn over sample, column template is marked according to place domain number.Play template sideline according to floor during formwork erection, line ball is from bottom to top installed.Adjacent block template splicing position, adopts 40 × 90 jail, wooden a tree, used in making timber for boats back of the body a tree, used in making timber for boats top splicing edges.After column template is in place, required to be arranged in template according to formwork by 40 × 90 back of the body a tree, used in making timber for boats, wooden a tree, used in making timber for boats spacing should be uniformly distributed according to the template length of side, adopts the clamping of steel pipe anchor ear, tightens anchor ear screw rod 3 type card in time, can by template cross section tension 3 ~ 5mm when 3 type cards are reinforced.Require overall height messenger wire when column template installs, correct verticality, post and plate delivery position answer seat to starch.
6, structural column concreting
This engineering method structural column has lattice column to affect due to post core, vibrates difficulty in the space of inserting between vibrating spear and lattice column, structural column two sides, maybe cannot vibrate and the concrete quality problem that produces for eliminating vibrating spear difficulty of vibrating.Stay at cap top and establish concreting hole, vibrate in employing lattice column+template is auxiliary outward vibrates to ensure concrete pouring quality.
6.1, after inner support of having constructed plate, first with steel brush cleaning lattice column iron rust, and adopt the Portland cement of common Po32.5 to prepare plain-water slurry, then smear lattice column successively from top to bottom, thus avoid the corrosion of lattice column.During structural column concreting, 2 sleeve pipes are diagonally set at capital end, guarantee concrete pouring quality.
6.2, concreting waters a small amount of clear water in first 30 minutes in template, template, lattice column, reinforcing bar is fully moistening, New-old concrete joint surface at the bottom of post first lays one deck and concrete with the sub-mortar of proportioning de-stone, and laying depth controls at 100mm, to eliminate " rotten " phenomenon.
6.3, slump of marching into the arena controls between 180 ~ 200mm, for making concrete mix can enter less position, frame column space, for slump less or segregation situation, return goods immediately.
6.4, primary the building of concrete is no more than 50cm, and each concrete vibrating of building in height closely knit after can carry out next time concrete building.Concreting is to building from cap soffit 500mm place's stopping, and interval 1h, to make concrete settlement.Continue before concrete initial set to build residue position concrete.
6.5, concrete is often put and is built time proper extension, controls, at 30 ~ 45s, to shake again after 10 ~ 20min.Final step concreting, concrete is after charging aperture blanking, and when vibrating, vibrating spear need insert 50mm in concreting in advance, builds to cap bottom surface, is removed by top laitance.Again concreting again, until Concrete Filled evenly after again vibrate, until closely knit.Because concrete shrinkage still can produce gap, therefore must and use slip casting method process.
6.6, in casting process, as found, concrete cannot be built and put in place, and tapping template finds large area cavity, stops concreting immediately, and stripping as early as possible, clear up with concreting.And rinse the concrete on reinforcing bar with water, ensure that reinforcing bar cleans unaffected.
The construction method of the present embodiment has following characteristics:
1, the present embodiment is in design stage just clear and definite theory, the Position Design of lattice column in inner support in basement construction is positioned at the position of basement structure post, after the stressed support of basement completes, lattice column will not be removed, as the structural column of basement structure after assembling reinforcement outside lattice column, concreting.In work progress, not only reduce the duration produced because removing lattice column, and reduce difficulty of construction, decrease noise, dust pollution.
2, antiseptic and rustproof process, after inner support of having constructed plate, first with steel brush cleaning lattice column iron rust, and adopts the Portland cement of common Po32.5 to prepare plain-water slurry, then smears lattice column successively from top to bottom, thus avoid the corrosion of lattice column.
3, lattice column does basement structure post, shaped steel in structural column is not by the restriction of steel ratio, the bearing capacity of lattice column can higher than the bearing capacity of the reinforced concrete member of same profile, and lattice column ductility good (namely shock resistance is good), thus can reduce member section area simultaneously.
4, beam reinforced steel bar is when lattice column joins, and beam reinforced steel bar strengthens beam end cross section through lattice column by punching through lattice column or bending reinforcing steel bar.Improve Nodes cross section shear strength.
5, constructing for structural column against making the interim lattice column of internal support of foundation pit, in work progress, not needing soil excavation to complete basement vertical structure of just constructing in advance, effectively can shorten construction period, improve basement space utilization rate.
6, cap structure is set in the junction of lattice column and basement bottom board, by the synergy of cap and structural column, solves base plate Punching Shear problem; Reduce the effective span of base plate; Reduce seat shoulder bar.Solution basement structure span is large affects the stressed problem of building integral.
7, by+template auxiliary technology of vibrating outward of vibrating in lattice column, ensure concreting compactness, improve structural column intensity and supporting capacity.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within claims of the present invention.

Claims (2)

1. the interim lattice column of inner support is used as a method for permanent structure post, comprises the following steps:
One, the design principles that is combined with permanent structure post of lattice column
The lattice column of inner support is arranged on the position of basement structure post within the scope of internal support of foundation pit, meets the force status as the interim lattice column of inner support; After excavation of foundation pit, lattice column is as the stiffness reinforcing bar of permanent structure post, forms permanent structure post;
Stand column pile participates in engineering pile stressed, stand column pile is utilized as the Force Calculation rule of engineering pile by a clump of piles;
Two, stand column pile construction
Measure:
The place being beneficial to protection and setting-out on construction ground arranges surface traverse point, and according to plane delivery receiving stake record, setting-out goes out the plane coordinates of surface traverse point;
Drilling and forming hole, clear hole:
Every drilling depth 4 ~ 5m verifies once, and before more bit change and easily shrinkage cavity place all should be verified; Hole depth deviation ensures within ± 10cm; Sediment thickness is as the criterion with measured quantity behind the clear hole of second time, need be not more than 5cm;
The object in clear hole exchanges mud in hole, eliminates boring mud and precipitation, utilize the direct circulation system of pore-forming directly to carry out; Clear hole divides secondary to carry out, and first time, clear hole was carried out immediately after pore-forming; The clear hole of second time is carried out transferring after reinforcing cage and conduit install; Behind clear hole, planted agent pours into concrete half an hour;
Install reinforcing cage:
The lifting of stand column pile fabrication of reinforcing cage is with conventional bored pile pouring construction;
The installation of lattice column and verticality Bit andits control:
Lattice column adopts an automobile loop wheel machine to hang, and suspension centre is positioned at lattice column top; The fixing main muscle top of reinforcing cage part that adopts of lattice column bends up, and be welded and fixed with lattice column batten plate and angle steel, time fixing, lattice column must occupy reinforcing cage center;
In above-mentioned welding process, crane hangs lattice column all the time, avoids it stressed; Accurately should locate when shaped steel king-pile hangs, guarantee that stand column pile perpendicularity of lattice column controls 1/500 ~ 1/1000, centre deviation ± 5mm;
Underwater concrete irrigate:
In order to ensure concrete pouring quality during the pouring of stand column pile concrete, guaranteeing to enter the concrete of lattice column in stake and reaching designing requirement, a pile underwater concrete pouring technique should be taked; And adopt pumping concrete to construct;
Three, structural column construction
The technological process of structural column construction is as follows:
Cubic metre of earth smooth → cushion construction → line setting → draw hole → insertion reinforcing bar → cap construct → welds well word muscle for locating stirrup → cover column tie-bar → vertical applied force muscle connection → bandage muscle → carry out next process on stem stem lattice column
Cap is constructed:
Adopt arch without beam, cap is set at lattice column and floor part, base plate Punching Shear problem can be solved; Reduce the effective span of base plate; Reduce seat shoulder bar; According to stressed different with structure, cap is divided into half cap structure, 3/4 cap structure, double capital structure, complete cap to construct four classes;
Stirrup is located:
On lattice column, well word muscle is welded according to post position; Carry out the main muscle of post after location stirrup is firm with the colligation of well word muscle to be connected;
Structural column stirrup can pass from the space between lattice column angle steel, when stirrup meet lattice column batten plate time, can punch on batten plate through, the aperture that batten plate punches is bar diameter+2mm;
Structural column Vertical bar connection:
Outside lattice column during Vertical bar connection, for ensureing programming and quality, bar diameter D >=Ф 20 in post, bar splice adopts straight thread compression sleeve to connect; In every layer of basement bottom board work progress, put into reinforcing bar at cap position lattice column surrounding electricity consumption drill hole, reinforcing bar insertion depth is from cap bottom 1m; To treat upper and lower two-layer pressed splice after soil excavation according to layout design and code requirement straight screw sleeve;
Lattice column is connected with basement roof:
Weld with basement roof junction the peg that specification is d=19, L=100 at lattice column, peg spacing is 100mm, increases the adhesion stress with floor by peg; Steel bracket under basement driving passage place arranges beam, steel bracket is connected by full weld with lattice column;
Lattice column is connected with first brace summer:
First one deck C10 concrete cushion is built at beam bottom pour mold when lattice column is connected with brace summer, bed course and lattice column junction arrange angle steel supporting plate, it is 12mm batten plate that lattice column and beam join the every elongated full weld in the limit two pieces of thickness in bottom, bore a hole along axis of support direction on lattice column top, aperture is bar diameter+2mm, weld 3 Φ 20 reinforcing bars, be connected with brace summer; Brace summer concreting cuts bottom concrete bed course after reaching structural strength;
Lattice column is when cap position is connected with beam reinforced steel bar, and beam reinforced steel bar is that the punching of lattice column crossover sites strengthens beam end cross section through lattice column through lattice column or bending reinforcing steel bar; Improve Nodes structural shear strength;
Four, structural column formwork erection
The construction technology of structural column formwork erection: erection column template → installation tie → Allah's bar or diagonal brace → template are checked and accepted
Structural column side template adopts 40 × 90 wooden a tree, used in making timber for boats as secondary back cord, and main back cord adopts Φ 48 × 3.0 laterally two steel pipe; Column template installs must brush aqueous demoulding agent; Carpenter should be carried out before formwork erection and turn over sample, column template is marked according to place domain number; Play template sideline according to floor during formwork erection, line ball is from bottom to top installed; Adjacent block template splicing position, adopts 40 × 90 jail, wooden a tree, used in making timber for boats back of the body a tree, used in making timber for boats top splicing edges; After column template is in place, required to be arranged in template according to formwork by 40 × 90 back of the body a tree, used in making timber for boats, wooden a tree, used in making timber for boats spacing should be uniformly distributed according to the template length of side, adopts the clamping of steel pipe anchor ear, tightens anchor ear screw rod 3 type card in time, can by template cross section tension 3 ~ 5mm when 3 type cards are reinforced; Require overall height messenger wire when column template installs, correct verticality, post and plate delivery position answer seat to starch;
Five, structural column concreting
Structural column has lattice column to affect due to post core, vibrates difficulty in the space of inserting between vibrating spear and lattice column, structural column two sides, maybe cannot vibrate and the concrete quality problem that produces for eliminating vibrating spear difficulty of vibrating; Stay at cap top and establish concreting hole, vibrate in employing lattice column+template is auxiliary outward vibrates to ensure concrete pouring quality;
After inner support of having constructed plate, first with steel brush cleaning lattice column iron rust, and adopt common Po32.5 portland cement to prepare plain-water slurry, then smear lattice column successively from top to bottom, thus avoid the corrosion of lattice column; During structural column concreting, 2 sleeve pipes are diagonally set at capital end, guarantee concrete pouring quality;
Concreting waters a small amount of clear water in first 30 minutes in template, template, lattice column, reinforcing bar is fully moistening, New-old concrete joint surface at the bottom of post first lays one deck and concrete with the sub-mortar of proportioning de-stone, and laying depth controls at 100mm, to eliminate " rotten " phenomenon;
Slump of marching into the arena controls between 180 ~ 200mm, for making concrete mix can enter less position, frame column space, for slump less or segregation situation, should stop using immediately;
Primary the building of concrete is no more than 50cm, and each concrete vibrating of building in height closely knit after can carry out next time concrete building; Concreting is to building from cap soffit 500mm place's stopping, and interval 1h, to make concrete settlement; Continue before concrete initial set to build residue position concrete;
Concrete is often put and is built time proper extension, controls, at 30 ~ 45s, to shake again after 10 ~ 20min; Final step concreting, concrete is after charging aperture blanking, and when vibrating, vibrating spear need insert 50mm in concreting in advance, builds to cap bottom surface, is removed by top laitance; Again concreting again, until Concrete Filled evenly after again vibrate, until closely knit; Because concrete shrinkage still can produce gap, therefore must and use slip casting method process;
In casting process, as found, concrete cannot be built and put in place, and tapping template finds large area cavity, stops concreting immediately, and stripping as early as possible, clear up with concreting; And rinse the concrete on reinforcing bar with water, ensure that reinforcing bar cleans unaffected.
2. construction method according to claim 1, is characterized in that, for underwater concrete irrigate, comprises following concrete steps:
(1) in lattice column, insert perfusion concrete conduit, carry out secondary pile hole cleaning; First carry out pile body underwater concrete pouring; In work progress, be responsible for concrete face rising testing and control by special messenger; When this part concrete is close to lattice column bottom surface, when reaching predetermined control absolute altitude, the insertion depth of conduit in concrete is controlled in adjustment well, and suitably reduces irrigation amount, make concrete face slowly increase, avoid producing the skew of lattice column bottom centre because water velocity is fast or producing top mark height displacement on lattice column;
(2) conduit and hopper is avoided to collide lattice column and cause the inclination of lattice column;
(3) when concrete pouring reaches design of pile top absolute altitude, and after ensureing that bleeding reaches design and regulation and stipulation height, stop concrete pouring, extract conduit section by section;
(4) control pouring concrete interface, prevent too high bolt is encased in concrete face from causing locating lattice column.
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CN109183812A (en) * 2018-11-01 2019-01-11 深圳市工勘岩土集团有限公司 The construction method of combined type deep foundation pit supporting structure
CN109837924A (en) * 2019-01-31 2019-06-04 中国建筑第八工程局有限公司 Pattern foundation pit supporting structure lattice column and main structure interleave the construction method at position
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