CN106088640A - The method that existing frame structure is carried out demolishing columns - Google Patents

The method that existing frame structure is carried out demolishing columns Download PDF

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Publication number
CN106088640A
CN106088640A CN201610392931.XA CN201610392931A CN106088640A CN 106088640 A CN106088640 A CN 106088640A CN 201610392931 A CN201610392931 A CN 201610392931A CN 106088640 A CN106088640 A CN 106088640A
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CN
China
Prior art keywords
post
frame structure
columns
steel
carried out
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Pending
Application number
CN201610392931.XA
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Chinese (zh)
Inventor
韦芳芳
杜金娥
景剑
胡雪峰
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Hohai University HHU
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Hohai University HHU
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Priority to CN201610392931.XA priority Critical patent/CN106088640A/en
Publication of CN106088640A publication Critical patent/CN106088640A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0266Enlarging

Abstract

The invention discloses a kind of method that existing frame structure is carried out demolishing columns, comprise the steps: to reinforce the adjacent pillars intending removing post, and steel strand wires are set at bean column node;Between the beam intending dismounting post place layer and plan dismounting post last layer, X-type shaped steel strut is set;Cast concrete, reaches the post-tensioning steel strand of predetermined strength at post increasing section position concrete strength;Remove after maintenance intended duration and intend removing post.The present invention need not reinforce original structure Vierendeel girder, substantially reduces the construction volume to existing frame structure demolishing columns;The steel strut arranging type can effectively improve the anti-seismic performance of structure and absorb energy dissipation capacity, easy construction.Using external prestressing technique construction easier, load path is definitely.External prestressing can offset the horizontal loading that truss portion transmits, and prevents girder adjacent with taking out post by drawing crack.

Description

The method that existing frame structure is carried out demolishing columns
Technical field
The invention belongs to architectural engineering transformation field of reinforcement, particularly one and utilize external prestressing and truss switch technology Existing frame structure is carried out the novel method of demolishing columns.
Background technology
Along with the development in city, the standard width of a room in an old-style house and the depth of some old buildings are less, it is difficult to meet modern commerce operation to building The requirement in space, often need to extract part frame cylinder because of changing function carries out spatial spread to these buildings.
Using now relatively more reinforcement means is that the two-layer beam to the place layer and last layer of removing post strengthens Cross section, and the armored concrete strut of X-type is set at interlayer.Use above-mentioned reinforcement means to need at the construction field (site) and relatively multimode is set Plate, support, and to carry out oblique Bar Anchorage, casting and compacting of concrete, concreting amount is very big, constructs relatively complicated;And, Reinforced concrete truss is also the structure of a kind of relatively brittle break, and ductility is poor, and its joint structure is complicated, reinforcing bar is the closeest, leads Cause casting and compacting of concrete to be difficult to closely knit, stress and concentrate serious.
Summary of the invention
The problem that it is an object of the invention to exist for prior art, it is provided that existing frame structure is taken out post and changed by one The method made.
It is an object of the invention to be achieved through the following technical solutions: a kind of existing frame structure is carried out demolishing columns Method, comprises the steps:
Step 1, reinforcing intend removing the adjacent pillars of post, and arrange steel strand wires at bean column node;
Step 2, intend remove post place layer and intend remove post last layer beam between X-type shaped steel strut is set;
Step 3, cast concrete, reach the post-stretching steel strand of predetermined strength at post increasing section position concrete strength Line;
Remove after step 4, maintenance intended duration and intend removing post.
Preferably, described steel strand wires are non-bending steel cable, are embedded in the coagulation in newly-increased cross section before post is reinforced and poured In soil, design linear for linear type.
Preferably, the reinforcement means of adjacent pillars is Enlargement of Section, and reinforcing position is to intending dismounting post place layer at the bottom of post Back place height.
Preferably, described X-type shaped steel strut is the HW of the catercorner length between two a length of former frame structure two posts Shaped steel, blocks wherein one from span centre position, and two steel poles of gained are welded on the steel pole that another root is complete formation X Type.
Preferably, in terms of parts by weight, described concrete includes following component: cement 380-420, medium sand 500-700, glass Glass fiber 15-25, water 180-200, coarse aggregate 800-1000, flyash 20-40, diminishing synergist 3-5.
Preferably, the structural formula of diminishing synergist is:
In formula, a:b:c=1:1.2:1, n are 45~50, and m is 45~50, and d is 50~80.
A kind of method that existing frame structure is carried out demolishing columns, comprises the steps:
Step 1, prestressing force minimum stretching force are estimated;
Nmin=(q1+q2)L2/(24h1), wherein, q1Represent dismounting design load suffered by pillar last layer girder, q2 Represent remove design load suffered by the adjacent girder of pillar, L represents and removes the adjacent girder of pillar span altogether, h1Represent Remove the floor height of pillar last layer.
Step 2, the adjacent pillars intending removing post being carried out increasing section process, reinforcing position is to remove post place to intending at the bottom of post The back place height of layer, and bean column node at center-to-center increases concrete position pre-buried soap-free emulsion polymeization steel strand newly before pouring Line;
Step 3, at the X-type strut intending removing post place layer with arrange HW shaped steel between the beam of last layer and weld formation: by two The HW shaped steel of the catercorner length between a length of former frame structure two post of root, wherein one is blocked from span centre position, and by institute Obtain two steel poles and be welded on the steel pole that another root is complete formation X-type, X-type strut and the connected mode of former framework by connecting plate Weld for wet method Baogang;
Step 4, casting concrete, treat that post increasing section position concrete strength carries out steel strand wires after reaching predetermined strength Stretch-draw, stretching mode is two ends synchronous tension;
Step 5, after newly-increased concrete section maintenance Preset Time to intend remove post remove.
The present invention has the following advantages compared to existing technology: the present invention need not reinforce original structure Vierendeel girder, significantly Reduce the construction volume to existing frame structure demolishing columns;The setting of shaped steel strut can effectively improve the anti-seismic performance of structure With absorption energy dissipation capacity, easy construction.Using external prestressing technique construction easier, load path is definitely.External Prestressing force can offset the horizontal loading that truss portion transmits, and prevents girder adjacent with taking out post by drawing crack.
Accompanying drawing explanation
Fig. 1 is that in the present invention, illustraton of model is calculated in the pre-estimation of prestressing force pulling force.
Fig. 2 is the elevation of the present invention.
Fig. 3 is the top view in A-A direction along Fig. 1.
Fig. 4 is that X-shaped steel bar of the present invention welds schematic diagram.
Fig. 5 is X steel pole of the present invention and framework connection diagram.
Detailed description of the invention
As it is shown in figure 1, the invention provides a kind of coalition External prestressed and truss switch technology to existing frame structure Carry out the novel method of demolishing columns, in the design phase because according to the internal force change of structure after taking out post, designing rational X-type type The cross section of steel strut and the configuration of prestress wire, make the original arrangement of reinforcement taking out post place layer and last layer Vierendeel girder meet and take out post The design moment that after-frame is set a roof beam in place;According to internal force value of calculation design connecting plate thickness, foot welding height and fusion length, and carry out cross section Weld seam checks, and the adjacent pillars taking out post place layer is carried out enlarging section design.
In conjunction with accompanying drawing, the detailed description of the invention of the present invention is described as follows:
The step of remodeling method includes:
(1): the adjacent pillars 2 intending removing post is carried out increasing section process (set is enclosed at four sides), reinforcing position is to intending at the bottom of post Remove the beam 1 of post place layer and push up place height, and before pouring bean column node at center-to-center to increase concrete position newly pre-buried Non-bending steel cable 3.
(2): weld, with arranging HW shaped steel between the beam of last layer, the X-type strut formed intending dismounting post place layer, specifically do Method is: by the HW shaped steel of the catercorner length between two a length of former frame structure two posts, wherein one is cut from span centre position Disconnected, and two steel poles of gained are welded on the steel pole that another root is complete formation X-type by connecting plate;X-type strut 4 and former framework Connected mode be wet method Baogang welding.
(3): casting concrete, treat that post increasing section portion 21 concrete strength carries out steel strand tension after reaching 70%, Stretching mode is two ends synchronous tension.
(4): remove intending removing post after newly-increased concrete section maintenance 28 days.
In a word, using shaped steel simple for production as truss stay rod, anti-seismic performance is good, it is also possible to solve constructional difficulties and node The problem that structure is complicated;Calculate configuration shaped steel cross section and external prestressing quantity of reinforcement by rational internal force, make former Vierendeel girder Improved design moment can be met, need not again Vierendeel girder be reinforced.
In a further embodiment, described concrete is optimized design.
In terms of parts by weight, described concrete includes following component: cement 380-420, medium sand 500-700, glass fibre 15-25, water 180-200, coarse aggregate 800-1000, flyash 20-40, diminishing synergist 3-5.
Wherein, the structural formula of described diminishing synergist is:
In formula, a:b:c=1:1.2:1, n are 45~50, and m is 45~50, and d is 50~80.
Experiment 1-8
Note: matched group be use ordinary water-reducing agent concrete, its 3d intensity be 130Mpa, 28d intensity be 135Mpa.

Claims (7)

1. the method that existing frame structure is carried out demolishing columns, it is characterised in that comprise the steps:
Step 1, reinforcing intend removing the adjacent pillars of post, and arrange steel strand wires at bean column node;
Step 2, intend remove post place layer and intend remove post last layer beam between X-type shaped steel strut is set;
Step 3, cast concrete, reach the post-tensioning steel strand of predetermined strength at post increasing section position concrete strength;
Remove after step 4, maintenance intended duration and intend removing post.
2. the method as claimed in claim 1 existing frame structure being carried out demolishing columns, it is characterised in that described steel strand wires For non-bending steel cable, it was embedded in the concrete in newly-increased cross section before post is reinforced and poured, designs linear for linear type.
3. the method as claimed in claim 1 existing frame structure being carried out demolishing columns, it is characterised in that adding of adjacent pillars Solid method is Enlargement of Section, and reinforcing position is to the back place height intending removing post place layer at the bottom of post.
4. the method as claimed in claim 1 existing frame structure being carried out demolishing columns, it is characterised in that described X-type type Steel strut is the HW shaped steel of the catercorner length between two a length of former frame structure two posts, by wherein one from span centre position Block, and two steel poles of gained are welded on the steel pole that another root is complete formation X-type.
5. the method that existing frame structure is carried out demolishing columns as described in any one of Claims 1-4, it is characterised in that In terms of parts by weight, described concrete includes following component: cement 380-420, medium sand 500-700, glass fibre 15-25, water 180-200, coarse aggregate 800-1000, flyash 20-40, diminishing synergist 3-5.
6. the method as claimed in claim 5 existing frame structure being carried out demolishing columns, it is characterised in that
The structural formula of diminishing synergist is:
In formula, a:b:c=1:1.2:1, n are 45~50, and m is 45~50, and d is 50~80.
7. the method that existing frame structure is carried out demolishing columns, it is characterised in that comprise the steps:
Step 1, the adjacent pillars intending removing post being carried out increasing section process, reinforcing position is to remove post place layer to intending at the bottom of post Back place height, and bean column node at center-to-center increases the pre-buried non-bending steel cable in concrete position newly before pouring;
Step 2, at the X-type strut intending removing post place layer with arrange HW shaped steel between the beam of last layer and weld formation: by two root lengths Degree is the HW shaped steel of the catercorner length between former frame structure two post, and wherein one is blocked from span centre position, and by gained two Root steel pole is welded on the steel pole that another root is complete formation X-type by connecting plate, and X-type strut and the connected mode of former framework are wet Method Baogang welds;
Step 3, casting concrete, treat that post increasing section position concrete strength carries out steel strand wires after reaching predetermined strength and opens Drawing, stretching mode is two ends synchronous tension;
Step 4, after newly-increased concrete section maintenance Preset Time to intend remove post remove.
CN201610392931.XA 2016-06-03 2016-06-03 The method that existing frame structure is carried out demolishing columns Pending CN106088640A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106836848A (en) * 2017-01-16 2017-06-13 山东飞越钢结构工程有限公司 A kind of 3D modules take out column method
CN110043060A (en) * 2019-03-29 2019-07-23 杭州通达集团有限公司 A method of landing frame column is changed to beam post structures
CN111441583A (en) * 2019-01-17 2020-07-24 柏诚工程股份有限公司 Grouting method for enlarging cross section of frame column
CN113123629A (en) * 2021-03-30 2021-07-16 中国建筑第八工程局有限公司 Prestressed reinforcement construction method for increasing section of existing structure post-column beam
CN113622707A (en) * 2021-08-25 2021-11-09 北京市建筑工程研究院有限责任公司 Pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure

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CN101397814A (en) * 2007-09-25 2009-04-01 中色科技股份有限公司 Supporting method of factory building roof system at super large column-removed spacing
CN102140849A (en) * 2011-01-24 2011-08-03 中冶赛迪工程技术股份有限公司 Method for underpinning roof structure and expanding column space of steel structure factory building
CN202969979U (en) * 2012-11-28 2013-06-05 南京固强建筑技术有限公司 Removing column construction fixing structure

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Publication number Priority date Publication date Assignee Title
JP2005139691A (en) * 2003-11-06 2005-06-02 Sumitomo Forestry Co Ltd Column removal beam reinforcing method in partition part section and beam reinforcing structure
CN101397814A (en) * 2007-09-25 2009-04-01 中色科技股份有限公司 Supporting method of factory building roof system at super large column-removed spacing
CN102140849A (en) * 2011-01-24 2011-08-03 中冶赛迪工程技术股份有限公司 Method for underpinning roof structure and expanding column space of steel structure factory building
CN202969979U (en) * 2012-11-28 2013-06-05 南京固强建筑技术有限公司 Removing column construction fixing structure

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106836848A (en) * 2017-01-16 2017-06-13 山东飞越钢结构工程有限公司 A kind of 3D modules take out column method
CN111441583A (en) * 2019-01-17 2020-07-24 柏诚工程股份有限公司 Grouting method for enlarging cross section of frame column
CN110043060A (en) * 2019-03-29 2019-07-23 杭州通达集团有限公司 A method of landing frame column is changed to beam post structures
CN113123629A (en) * 2021-03-30 2021-07-16 中国建筑第八工程局有限公司 Prestressed reinforcement construction method for increasing section of existing structure post-column beam
CN113622707A (en) * 2021-08-25 2021-11-09 北京市建筑工程研究院有限责任公司 Pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure

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