CN103321443A - Structural-transformation construction method - Google Patents

Structural-transformation construction method Download PDF

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Publication number
CN103321443A
CN103321443A CN201310261126XA CN201310261126A CN103321443A CN 103321443 A CN103321443 A CN 103321443A CN 201310261126X A CN201310261126X A CN 201310261126XA CN 201310261126 A CN201310261126 A CN 201310261126A CN 103321443 A CN103321443 A CN 103321443A
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CN
China
Prior art keywords
concrete
steel
prestressed
prestress wire
steel strand
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Pending
Application number
CN201310261126XA
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Chinese (zh)
Inventor
朱奎
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朱奎
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Priority to CN201310261126XA priority Critical patent/CN103321443A/en
Publication of CN103321443A publication Critical patent/CN103321443A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a structural-transformation construction method. The method includes (1) erecting a support of a prestressed concrete beam, and disassembling the prestressed concrete beam; (2) disassembling a part of concrete of the prestressed concrete beam: clamping the concrete into pieces through a hydraulic tong, and then cleaning the concrete pieces through a hammer; (3) disassembling a part of prestressed steel strands of the prestressed concrete beam; (4) reinforcing the part of the prestressed concrete beam; (5) erecting a support of the prestressed concrete beam; (6) reinforcing a concrete column: reinforcing the concrete column through glass fiber fabric and applying prestress on the glass fibers.

Description

The structure of modification job practices
Technical field
The present invention relates to a kind of building structure, particularly a kind of building structure rebuilding construction method.
Background technology
The house uses the change of function can cause the building structure transformation, and the part beam in the house may be cancelled, and the load that these beams bear is married again other beams, and beam must improve bearing capacity.For adopting prestressed mixed earth beam, if do not take necessary technical measures just it to be removed without authorization, prestress wire might occur and break suddenly and affect the phenomenon of safety of workers.And for the prestressed concrete beam that will reinforce, reinforcement means also must be considered the prestressed characteristics of member, to reach economical and practical purpose.Same post also has same situation, and after the cancellation of part post, the load of remainder post can obviously increase, and guarantee structural safety, must reinforce by coupled columns.
Summary of the invention
Technical problem to be solved by this invention provides a kind of safe and reliable structure of modification job practices.
Construction sequence of the present invention comprises:
(1) sets up the support of prestressed concrete beam, prestressed concrete beam is unloaded.
(2) concrete of dismounting partially prestressed beam.
In the concrete removal process prestress wire that is in high-stress state is produced the situation of damaging and occuring to break suddenly, adopt the hydraulic concrete pincers that the concrete of beam is pressed from both sides into fragment, then with hand hammer broken concrete is removed.
(3) prestress wire of dismounting partially prestressed beam.
In prestress wire span centre section two groups of controlled slip ground tackles are installed, spacing is 1m, near two bearing places controlled slip ground tackle is being installed respectively, and ground tackle is clamped steel strand.Then with gas cutting prestress wire is fused in the middle of controlled slip ground tackle, slowly loosen at last controlled slip ground tackle, the stress of prestress wire is reduced gradually, until fully lax.Because prestress wire in the beam is that boundling is arranged, when being installed, controlled slip ground tackle needs with bquster prestress wire to be strutted.Before steel strand fusing construction, the leather of every steel strand is removed and with steel strand surface grease wiped clean, prevent the generation that the leather of being lighted drops and the condition of a fire occurs and reduce pernicious gas when fusing.In dismounting and uninstall process, prevent steel strand to break suddenly at beam end installation steel plate protective cover and scurry out.
(4) footing prestressed concrete beam.
Steel strand topping strip off with prestressed concrete beam; lax steel strand; and steel strand are reinforced in increase; every steel strand are installed in bearing plate and spiral bar; formwork supporting plate will be chiseled the position and build closely knitly with High Strength Non-shrinking Filling Material, and grouting material intensity normal temperature carries out the again stretch-draw of prestress wire after lower 2 days.Stretching end makes original anchor clipper clamp prestress wire, stays the prestress wire protection section of establishing to put prestressed anchor at stretching end, further steel strand is carried out anchoring and clamps, and prevents that contracting muscle phenomenon from appearring in prestress wire in stretching process.
(5) set up the support of prestressed concrete beam.
(6) reinforcing of concrete column.
Adopt glass fabric that concrete column is reinforced, glass fiber is applied prestressing force increase glass fiber to the globality of concrete column, reduce the concrete column distortion, delay the generation in crack, further improve and be subjected to curved ultimate bearing capacity, reduce early concrete post plastic failure risk, strengthen the mechanical property of concrete column.
The reinforcing construction process of concrete column comprises: crab-bolt is installed at 400~500mm position more than the concrete column bottom, and the crab-bolt diameter is 25mm, and crab-bolt is real with rotary stretch-draw and anchoring facility fixed knot; At concrete column external surface brushing resin; Glass fabric is wound in steel rider; Rotation steel rider stretch-draw glass fabric; Reach and to rotate steel rider behind the control stress for prestressing and fix with pin; The glass fabric compacting is made itself and concrete column surface layer bonds well.
The present invention adopts special-purpose anchoring facility, and ground tackle adopts the Q235 steel plate, and the both sides steel plate thickness is 18mm, and bottom welding thickness is the steel plate of 16mm, and reserving diameter in the middle of the steel plate of both sides is the circular hole of 28mm, and aperture is reserved in the positive upper end of circular hole, straight-through steel plate top.The ground tackle rotating shaft is the high-strength steel rider of diameter 25mm, and the torque spanner by a side freely rotates in the diameter 28mm circular hole of both sides by steel rider, and the glass fabric that is wrapped in the top has been applied prestressing force.After quantitatively having applied prestressing force, from the aperture that two mother rib lateral rotundum tops are reserved, insert steel pin, high-strength steel rider to be fixed, the glass fabric after will straining simultaneously directly is anchored in tensioning equipment.
Glass fabric prestressed stretch-draw efficient of the present invention is high, and stretching construction only need reverse steel rider and get final product, and is simple and convenient, the large I flexible modulation of stretching force and control; Firm to the glass fabric anchoring, consolidation effect is good, compares traditional u tie anchoring, and this anchoring effect stripping damage can not occur in advance, can give full play to the performance of glass fiber cloth material, and the loss of prestress of cloth is little, loose little simultaneously; Use this ground tackle to carry out prestressed glass fiber cloth reinforced, can reduce the consumption of glass fabric.
The specific embodiment
Below the present embodiment is described in detail.
Construction sequence comprises:
(1) sets up the support of prestressed concrete beam, prestressed concrete beam is unloaded.
(2) concrete of dismounting partially prestressed beam.
Adopt the hydraulic concrete pincers that the concrete of beam is pressed from both sides into fragment, then with hand hammer broken concrete is removed.
(3) prestress wire of dismounting partially prestressed beam.
In prestress wire span centre section two groups of controlled slip ground tackles are installed, spacing is 1m, near two bearing places controlled slip ground tackle is being installed respectively, and ground tackle is clamped steel strand.Then with gas cutting prestress wire is fused in the middle of controlled slip ground tackle, slowly loosen at last controlled slip ground tackle, the stress of prestress wire is reduced gradually, until fully lax.When being installed, controlled slip ground tackle needs with bquster prestress wire to be strutted.Before steel strand fusing construction, the leather of every steel strand removed and with steel strand surface grease wiped clean.In dismounting and uninstall process, in beam end the steel plate protective cover is installed.
(4) footing prestressed concrete beam.
Steel strand topping strip off with prestressed concrete beam; lax steel strand; and steel strand are reinforced in increase; every steel strand are installed in bearing plate and spiral bar; formwork supporting plate will be chiseled the position and build closely knitly with High Strength Non-shrinking Filling Material, and grouting material intensity normal temperature carries out the again stretch-draw of prestress wire after lower 2 days.Stretching end makes original anchor clipper clamp prestress wire, stays the prestress wire protection section of establishing to put prestressed anchor at stretching end, further steel strand is carried out anchoring and clamps.
(5) set up the support of prestressed concrete beam.
(6) reinforcing of concrete column.
Adopt glass fabric that concrete column is reinforced, glass fiber is applied prestressing force.
The reinforcing construction process of concrete column comprises: crab-bolt is installed at 400~500mm position more than the concrete column bottom, and the crab-bolt diameter is 25mm, and crab-bolt is real with rotary stretch-draw and anchoring facility fixed knot; At concrete column external surface brushing resin; Glass fabric is wound in steel rider; Rotation steel rider stretch-draw glass fabric; Reach and to rotate steel rider behind the control stress for prestressing and fix with pin; The glass fabric compacting is made itself and concrete column surface layer bonds well.
Ground tackle adopts the Q235 steel plate, and the both sides steel plate thickness is 18mm, and bottom welding thickness is the steel plate of 16mm, and reserving diameter in the middle of the steel plate of both sides is the circular hole of 28mm, and aperture is reserved in the positive upper end of circular hole, straight-through steel plate top.The ground tackle rotating shaft is the high-strength steel rider of diameter 25mm, and the torque spanner by a side freely rotates in the diameter 28mm circular hole of both sides by steel rider, and the glass fabric that is wrapped in the top has been applied prestressing force.After quantitatively having applied prestressing force, from the aperture that two mother rib lateral rotundum tops are reserved, insert steel pin, high-strength steel rider to be fixed, the glass fabric after will straining simultaneously directly is anchored in tensioning equipment.

Claims (3)

1. structure of modification job practices is characterized in that construction sequence comprises:
(1) sets up the support of prestressed concrete beam, prestressed concrete beam is unloaded;
(2) concrete of dismounting partially prestressed beam;
Adopt the hydraulic concrete pincers that the concrete of beam is pressed from both sides into fragment, then with hand hammer broken concrete is removed;
(3) prestress wire of dismounting partially prestressed beam;
In prestress wire span centre section two groups of controlled slip ground tackles are installed, spacing is 1m, near two bearing places controlled slip ground tackle is being installed respectively, and ground tackle is clamped steel strand; Then with gas cutting prestress wire is fused in the middle of controlled slip ground tackle, slowly loosen at last controlled slip ground tackle, the stress of prestress wire is reduced gradually, until fully lax; When being installed, controlled slip ground tackle needs with bquster prestress wire to be strutted; Before steel strand fusing construction, the leather of every steel strand removed and with steel strand surface grease wiped clean; In dismounting and uninstall process, in beam end the steel plate protective cover is installed;
(4) footing prestressed concrete beam;
Steel strand topping strip off with prestressed concrete beam, lax steel strand, and steel strand are reinforced in increase, every steel strand are installed in bearing plate and spiral bar, formwork supporting plate will be chiseled the position and build closely knitly with High Strength Non-shrinking Filling Material, and grouting material intensity normal temperature carries out the again stretch-draw of prestress wire after lower 2 days; Stretching end makes original anchor clipper clamp prestress wire, stays the prestress wire protection section of establishing to put prestressed anchor at stretching end, further steel strand is carried out anchoring and clamps;
(5) set up the support of prestressed concrete beam;
(6) reinforcing of concrete column;
Adopt glass fabric that concrete column is reinforced, glass fiber is applied prestressing force.
2. the structure of modification job practices shown in according to claim 1, the reinforcing construction process that it is characterized in that concrete column comprises: crab-bolt is installed at 400~500mm position more than the concrete column bottom, the crab-bolt diameter is 25mm, and crab-bolt is real with rotary stretch-draw and anchoring facility fixed knot; At concrete column external surface brushing resin; Glass fabric is wound in steel rider; Rotation steel rider stretch-draw glass fabric; Reach and to rotate steel rider behind the control stress for prestressing and fix with pin; The glass fabric compacting is made itself and concrete column surface layer bonds well.
3. the structure of modification job practices shown in according to claim 1 is characterized in that ground tackle adopts the Q235 steel plate, and the both sides steel plate thickness is 18mm, bottom welding thickness is the steel plate of 16mm, reserving diameter in the middle of the steel plate of both sides is the circular hole of 28mm, and aperture is reserved in the positive upper end of circular hole, straight-through steel plate top; The ground tackle rotating shaft is the high-strength steel rider of diameter 25mm, and the torque spanner by a side freely rotates in the diameter 28mm circular hole of both sides by steel rider, and the glass fabric that is wrapped in the top has been applied prestressing force; After quantitatively having applied prestressing force, from the aperture that two mother rib lateral rotundum tops are reserved, insert steel pin, high-strength steel rider to be fixed, the glass fabric after will straining simultaneously directly is anchored in tensioning equipment.
CN201310261126XA 2013-06-14 2013-06-14 Structural-transformation construction method Pending CN103321443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310261126XA CN103321443A (en) 2013-06-14 2013-06-14 Structural-transformation construction method

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Application Number Priority Date Filing Date Title
CN201310261126XA CN103321443A (en) 2013-06-14 2013-06-14 Structural-transformation construction method

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CN103321443A true CN103321443A (en) 2013-09-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113622704A (en) * 2021-08-18 2021-11-09 中国矿业大学 Method for modifying reinforced concrete prestressed frame structure with local beam cutting
CN113622703A (en) * 2021-08-18 2021-11-09 中国矿业大学 Method for reforming and reinforcing prestressed reinforced concrete beam

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11107539A (en) * 1997-09-30 1999-04-20 Kumagai Gumi Co Ltd Method for exposing water resistant layer
CN202202577U (en) * 2011-08-18 2012-04-25 正益集团有限责任公司 Post disassembly structure of pre-stressed support beam
CN102425311A (en) * 2011-09-05 2012-04-25 长沙理工大学 Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11107539A (en) * 1997-09-30 1999-04-20 Kumagai Gumi Co Ltd Method for exposing water resistant layer
CN202202577U (en) * 2011-08-18 2012-04-25 正益集团有限责任公司 Post disassembly structure of pre-stressed support beam
CN102425311A (en) * 2011-09-05 2012-04-25 长沙理工大学 Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer)

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
初美红: "旋转式机具在碳纤维片材预应力加固技术中的应用研究", 《山东水利》 *
葛呈强,孙鸿剑: "预应力放张技术在预应力结构改造中的应用", 《今日科苑》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113622704A (en) * 2021-08-18 2021-11-09 中国矿业大学 Method for modifying reinforced concrete prestressed frame structure with local beam cutting
CN113622703A (en) * 2021-08-18 2021-11-09 中国矿业大学 Method for reforming and reinforcing prestressed reinforced concrete beam
CN113622704B (en) * 2021-08-18 2022-04-26 中国矿业大学 Method for modifying reinforced concrete prestressed frame structure with local beam cutting

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Application publication date: 20130925

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