CN106703437B - Shock insulation underpinning structure and its construction method - Google Patents
Shock insulation underpinning structure and its construction method Download PDFInfo
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- CN106703437B CN106703437B CN201611093682.0A CN201611093682A CN106703437B CN 106703437 B CN106703437 B CN 106703437B CN 201611093682 A CN201611093682 A CN 201611093682A CN 106703437 B CN106703437 B CN 106703437B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/027—Preventive constructional measures against earthquake damage in existing buildings
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Abstract
The present invention provides a kind of shock insulation underpinning structure and its construction method, which includes shock isolating pedestal and underpin system, and the foundation platform of building is equipped with upper buttress, and construction bottom has lower buttress, and the shock isolating pedestal is mounted between buttress and lower buttress；It is described to underpin the reinforcing of building object and type steel support.This method include shock isolating pedestal installation and underpin system peace tear construction open.The present invention has the advantages such as the small surface of a wound, short time limit, low cost, seismic seeurity height, and engineering construction construction is fast, does not influence the resident of surrounding and the normal life of enterprises and institutions and work.And highly reliable, construction technology progress, social benefit and environmental benefit are obvious.
Description
Technical field
The present invention relates to a kind of isolation structures of building, and in particular to a kind of shock insulation underpinning structure and its construction method.
Background technique
Base isolation reinforcement refers between building and basis, a kind of special device is arranged, building and ground are separated, be isolated
Seismic energy is transmitted to building, mitigates address disaster.Base isolation reinforcement building is exactly shock-insulation building.
The effect that base isolation reinforcement is played can reduce 2-6 times of horizontal earthquake action: 1. when big shake, building does not collapse, very
To not destroying；2. indoor equipment, valuables, information system are not damaged；3. not interrupting the normal life and service of owner substantially.
Architectural vibration-insulation technology is the development and breakthrough to current seismic technology from structural system to design philosophy.Shock insulation adds
Gu theory is to weaken the connection in house and basis with Seismic Isolation of Isolation Layer, inputted so that seismic energy be isolated to house, Seismic Isolation of Isolation Layer plays
The effect of filtering.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provide a kind of shock insulation underpinning structure and its
Construction method.
Technical solution: in order to solve the above technical problems, shock insulation underpinning structure provided by the invention, including shock isolating pedestal and support
System is changed, the foundation platform of building is equipped with upper buttress, and construction bottom has lower buttress, and the shock isolating pedestal is mounted on buttress
Between lower buttress；The system that underpins includes building strengthening and type steel support.
Preferably, the shock isolating pedestal has upper embedded board and lower embedded board, the upper embedded board is fixedly connected on
The bottom of buttress, the lower embedded board are fixedly connected on the top of lower buttress.
Preferably, the type steel support is H profile steel, H profile steel is supported in joist bottom, and contact surface is not less than 50%.
When the building for brick mix structure, retaining wall is set in building surrounding, is stayed between retaining wall and building superstructure
There is shock insulation ditch.Building superstructure can be free to slide when guaranteeing earthquake.
When the building for frame structure, laminated rubber isolation cushion is set at regular intervals under first floor load bearing wall, column,
To reduce the seismic response of structure.
The present invention proposes that system peace is installed and underpined to the construction method of above-mentioned shock insulation underpinning structure, including shock isolating pedestal simultaneously
Tear construction open.
Specifically, shock isolating pedestal installation the following steps are included:
Step 1, buttress steel reinforcement cage is bound under shock isolating pedestal；
Step 2, built-in fitting positions, is fixed；
Step 3, lower buttress is poured；
Step 4, couple shock isolating pedestal and built-in fitting；
Step 5, buttress is poured.
Specifically, in the step 4,
If lower buttress installation site absolute altitude is higher than prescribed requirement, any excess concrete should be cut, it is again levelling；
If lower buttress installation site absolute altitude is lower than prescribed requirement,
A. the lower buttress of erection support, will first dismantle lower shock isolating pedestal；
B. chisel is no less than 20mm under concrete surface, has propped up template, and template to the outer peripheral distance of sleeve is not less than 50mm；
C. it using cushion block and adjusts to designed elevation；
D. with the abundant wetting interface of water, but must not there are bright water before grouting；
E. ingredient stirs；
F. it sits slurry method construction: the grouting material being stirred is poured into the template installed, pour into material and answer a little higher than design
Absolute altitude.Shock isolating pedestal is lifted immediately, squeezes out extra grouting material；Wet straw bag or rock wool should be covered after grouting in 30min immediately
Quilt, and keep wet, grouting material intensity tightens high-strength bolt after reaching 80%.
Specifically, it is described underpin system peace tear open construction the following steps are included:
Step 1, existing building various aspects are reinforced；
Step 2, all or part of branch in existing building basis is held；
Step 3, according to requirement of engineering, existing building ground or basis are reinforced；
Step 4, when having newly-built underground engineering under existing building basis, load should be passed to newly-built underground engineering
On；
Step 5, it is necessary to when remove underpinning structure.
Underpin process flow include: indoor and outdoor place horizontal line, basic earthwork excavate, bottom plate production, pour upper clamping beam and
Beam slab, installation and debugging support system device, puts embedded board under shock insulation undersetting, puts embedded board on shock isolating pedestal, grouting material
Gap in filling between buttress and joist, dismounting underpin system and abolish isolated wall.
The utility model has the advantages that this invention takes the new technologies in Aseismic Design field --- it is anti-to be very suitable to building for shock design
Shake classification of setting up defences is attached most importance to class of setting up defences, and anti-seismic construction measure presses 8 degree (0.2g) in shock-insulating reconstruction, the registration of frame antidetonation by second level,
Structure is complicated and the higher project of technical requirements.The advantages such as, short time limit small with the surface of a wound, low cost, seismic seeurity height, engineering
When construction, fast because constructing, the influence to order in education is small, does not influence the resident of surrounding and the normal life of enterprises and institutions and work
Make.Because this engineering method is highly reliable, construction technology progress, social benefit and environmental benefit are obvious.
The technical issues of in addition to invention described above solution, constitutes the technical characteristic of technical solution and by these skills
Outside advantage brought by the technical characteristic of art scheme, shock insulation underpinning structure of the invention and its construction method can solve other
The advantages of other technical characteristics and these technical characteristics for including in technical problem, technical solution are brought, will do in conjunction with attached drawing
Further details of explanation out.
Detailed description of the invention
Fig. 1 is the schematic diagram of underpinning structure in the embodiment of the present invention；
Fig. 2 is the installation steps 1 of shock isolating pedestal；
Fig. 3 is the installation steps 2 of shock isolating pedestal；
Fig. 4 is the installation steps 3 of shock isolating pedestal.
Specific embodiment
The construction method of shock insulation underpinning structure of the invention is as follows:
One, shock isolating pedestal is installed
1, buttress steel reinforcement cage is bound under shock isolating pedestal
Under shock isolating pedestal before buttress construction, the position of the vertical projection at shock isolating pedestal center is measured, shock isolating pedestal is used
Installation steel form demarcates the position of the vertical projection of four built-in fittings of shock isolating pedestal in advance on underplate concrete face, to avoid pre-
Embedded part is stopped by the main reinforcement of lower buttress.
Built-in fitting: refer to it is pre- be embedded in shock isolating pedestal up and down in buttress, make shock isolating pedestal and basis and superstructure interconnection
Component, be made of sleeve, reinforcing bar.Reinforcing bar is screwed into sleeve.
2, built-in fitting positions, is fixed
(1) built-in fitting positions:
The binding of lower buttress steel reinforcement cage finishes, and is fixed 4 built-in fittings using pre-buried positioning steel form, by bolt when fixation,
And clamp installation with template, it is then placed on steel reinforcement cage, measurement module absolute altitude, plan-position and flatness are right after adjustment
Built-in fitting is fixed.
(2) built-in fitting is fixed:
It harmonizes in built-in fitting bottom spot welding spacer ferrule muscle.It is done suitably using bar dowel and lower buttress steel reinforcement cage on built-in fitting top
It is fixed, guarantee positioning accuracy within the specified scope.
3, lower buttress pours
Positioning repetition measurement must be carried out before lower buttress casting concrete, repetition measurement content includes built-in fitting absolute altitude and center.
It is before concrete initial set, steel form dismounting progress is levelling after concreting, then shock isolating pedestal built-in fitting is determined
Position repetition measurement simultaneously records, and repetition measurement content includes built-in fitting absolute altitude, center and flatness.To avoid the sundries such as mortar, concrete
Into in sleeve hole, bolt should be screwed into sleeve.
4, shock isolating pedestal is installed
Concrete strength reach intensity 80% after can carry out shock isolating pedestal installation, must be carried out before installation positioning repetition measurement simultaneously
Record, repetition measurement content includes built-in fitting absolute altitude, center and flatness.Repetition measurement can carry out shock isolating pedestal peace after meeting the requirements
Dress.
Lower buttress face should be cleaned out when installation, lift shock isolating pedestal, and tighten high-strength bolt.Shock isolating pedestal installs
Afterwards, it repetition measurement shock isolating pedestal absolute altitude and plan-position and records.
5, upper buttress pours
(1) buttress built-in fitting is fixed on
Top built-in fitting is connected on shock isolating pedestal with high-strength bolt.
(2) buttress bed die installation reinforcing bar binding on
Buttress bed die is successively installed, buttress reinforcing bar, branch side form, casting concrete in binding.This part construction method with
Normal practice is identical.
(3) due to unavoidably being made to shock isolating pedestal paint in shock isolating pedestal installation process and shuttering supporting, demolishing process
It at damage and pollution, is finished to upper buttress concrete construction, after form removable, shock isolating pedestal paint is repaired and cleaned and is removed
It is dirty.
6, shock isolating pedestal installation deviation treatment measures
Before shock isolating pedestal installation, lower buttress installation site absolute altitude should then be handled if not being able to satisfy prescribed requirement.
(1) following buttress installation site absolute altitude is higher than prescribed requirement, then should cut any excess concrete, again levelling, meets
It is required that the mountable shock isolating pedestal installation in rear.
(2) buttress installation site absolute altitude is as follows lower than prescribed requirement
A. the lower buttress of erection support, will first dismantle lower shock isolating pedestal；
B. chisel is no less than 20mm under concrete surface, has propped up template, and template to the outer peripheral distance of sleeve is not less than 50mm；
C. it using cushion block and adjusts to designed elevation；
D. with the abundant wetting interface of water, but must not there are bright water before grouting；
E. ingredient stirs: mechanical stirring or artificial stirring can be used, recommend to use mechanical stirring mode.It should will be filled when stirring
Water (every 100 ㎏ grouting material water consumption is 13 ㎏, and specific amount of water please refers to factory report), side is added in ratio as required in slurry
Side stirring is added, until stirring evenly.1~2min of mechanical stirring, manual mixing time are no less than 3min, needed for being otherwise not achieved
Fluidity.
F. it sits slurry method construction: the grouting material being stirred is poured into the template installed, pour into material and answer a little higher than design
Absolute altitude.Shock isolating pedestal is lifted immediately, squeezes out extra grouting material.Pay attention at this point, not tighten high-strength bolt.After grouting
Wet straw bag or rock wool quilt should be covered in 30min immediately, and keeps wet, grouting material intensity can tighten high-strength bolt after reaching 80%.
7, shock isolating pedestal and its built-in fitting protection
After shock isolating pedestal and its built-in fitting are transported to construction site, unit in charge of construction should be kept properly, to avoid contaminated and damage
Bad, specific requirement is as follows:
(1) when shock isolating pedestal and its built-in fitting are stored, necessary measure should be taken to prevent its direct exposure or drench with rain.
(2) when shock isolating pedestal storage and erecting bed lift, it should keep cleaning, avoid pollution.Storage scene, avoids constructing
Leftovers, surplus soup are poured on shock isolating pedestal by personnel and security personnel, are caused using preceding pollution；Installation scene, avoids
Wirerope tears the outer protection sheet or plastic film of rubber in hoisting process；It is avoided during the installation process with sharp utensil to shock insulation
Support flanged plate draws figure, causes flanged plate peeling paint.
(3) formwork supporting plate and when scaffolding, avoid contacting with shock isolating pedestal at the scene.
(4) construction site replaces high-strength bolt with spare interim stove bolt before shock isolating pedestal installation.
(5) when installing shock isolating pedestal, live high-strength bolt will be led out by usage quantity；Current residual must be protected properly
Pipe, must not throw out without care, leave about.During the installation process, must not damage screw thread and contamination foul.
(6) during the installation process, sleeve is cleared up, makes to avoid height without concrete and cement slurry sundries in sleeve
The pollution and damage of strength bolt screw thread.
(7) vibration isolator rubber bearing that the same place of production should be used to produce on same buttress, to ensure vibration isolator rubber bearing
The consistency of energy.
8, construction monitoring
To prevent from having abnormal conditions in the construction process, we ask profession detection expert, using peace positive system to applying
To sedimentation, the deformation in house etc. it can happen that be monitored during work, once testing result occurs not meeting specification
Situation, corresponding measure should be taken to be modified.
It is substantially carried out settlement observation, is that monitoring point is set on upper one layer of wall of displacement members, precision level is set
It sets coordinate difference and depth displacement in the distal side that wall construction of replacing does not affect, according to same point in different time and regulates and controls vertical position
Precision is moved, to guarantee the safety and normal work of superstructure and off-load support system.
9, quality acceptance standard
(1) mark of rubber earthquake isolation support is complete, the damage of clear, screw thread flawless.
(2) rubber earthquake isolation support surface cleaning, without greasy dirt, silt, breakage etc., corrosion-inhibiting coating is uniform, bright and clean existing without leakage brush
As.
(3) the lower buttress of supporting vibration insulating support, top surface horizontal gradient error are not preferably greater than 5 ‰；After shock isolating pedestal installation,
The horizontal gradient error of shock isolating pedestal top surface is not preferably greater than 8 ‰.
(4) plan-position at shock isolating pedestal center and the deviation of design position should not exceed 5.0mm.
(5) absolute altitude at shock isolating pedestal center and the deviation of designed elevation should not exceed 5.0mm.
(6) the top surface height difference on same buttress between multiple shock isolating pedestals is not preferably greater than 5.0mm.
(7) shock isolating pedestal connecting plate and exposed connection bolt should take corrosion protection measure.
(8) in shock isolating pedestal erection stage, buttress (or column) top surface, the levelness of shock isolating pedestal top surface, shock insulation branch are coped with
The plan-position at seat center and absolute altitude are measured and are recorded.
(9) in Construction stage, the vertical deformation for coping with shock isolating pedestal is observed and is recorded.
10, quality control on construction
Strict control of quality is answered in work progress, and the material of component involved in unloading process, arrangement are carried out in time
It checks and accepts, measurement instrument is calibrated.
10.1, the control of raw material and semi-finished product, by province's pertinent regulations raw material and semi-finished product witness sampling inspection.
Steel: steel answer its physical and mechanical property of sample detection when purchasing, it is necessary to which qualification simultaneously has product certificate book side
Processing can be purchased；
Site welding is examined, by regulation sampling inspection it is qualified after can carry out next process.
10.2, the control of measurement instrument
Measurement instrument used in engineering (including jack, oil pressure gauge, level etc.) should all should be calibrated before use, really
Determine error just can be used within the allowable range, it is ensured that accurate measurement.
10.3, construction technology quality control method:
(1) every procedure must be operated strictly by corresponding regulation or standard, stringent Self-evaluation System.
(2) next procedure can be carried out after Party A's Field representatives or the written visa of management by, which reporting after every procedure self-test is qualified, applies
Work；
(3) construction drawing is conscientiously familiar with before construction, conscientiously detailed arrangement and method for construction is worked out in research, specifies construction method and work
Skill, performs technical annotation in construction and process is told somebody what one's real intentions are；
(4) construction journal, concealment acceptance record and visa work are conscientiously carried out.
10.4, quality control and examination
Stringent construction in line with the drawings strictly presses standard operation, implements Design of Construction Organization, obeys site supervision, Party A and quality supervision
The supervision and management of department carries out every record, confides a technological secret and management work, main item controlled are as follows:
(1) Design of Construction Organization must be authorized by correlation；
(2) preparation of construction is abundant, and each technique, each process, each work post are told somebody what one's real intentions are clear, it is desirable that every procedure, which reaches specification, to be wanted
It asks.
(3) quality assurance organizations system is sound；
(4) items are carried out in time to apply for checking and examination work；
(5) each process self-inspection record, every procedure can be checked and accepted after the completion with the relevant personnel；
(6) each subdivisional work record of acceptance of concealed work is carried out；
(7) adhere to daily before leaving offices, being taken the lead by project manager, the day's work quality inspection system that all administrative staff participate in
Degree, finds the problem, immediately treats；
(8) final acceptance of construction.
11, construction safety controls
For the personal safety for ensuring construction personnel, the thought of " safety first is puted prevention first " is established, it is raw to establish safety step by step
It produces responsibility system and formulates following concrete measure according to pertinent regulations.
(1) safety education is carried out conscientiously, and admission education is carried out to the personnel for participating in construction, carries out special off-load technology
And safe work of telling somebody what one's real intentions are, it is allowed to be familiar with the safety regulation for operations of respective work post；And propagandism educational work, make to participate in construction
There is the awareness of safety of height in owner.
(2) the site safety system of responsibility in production is established, adheres to that commander's construction must manage the principle of trouble free service, strict implement
Safety operation specification.
(3) constructional column dismounting should follow the principle for first supporting and removing again, and when dismounting should carry out subregion in batches, different batches
Settlement observation should be carried out during dismounting.
(4) jack pressure process should follow principle step by step, synchronous.
(5) reinforce the inspection constructed to site safety and supervise, protect the equipment and pipeline at scene.
(6) into the construction personnel of construction site, Safety helmet must be worn.
(7) electromechanical equipment must be provided with ground connection zero connection protection, send personal management, regular check, maintenance, maintenance.
(8) electrical equipment of site operation and route should be installed and be set up in construction horizontal layout, forbid to make
With the damaged or undesirable electric wire of insulation performance.
(9) fire safety measure is carried out at scene.
(10) absolutely no smoking at scene.
(11) special work post such as electrician, electrical welder must accomplish to take appointment with certificate.
(12) safety inspection is periodically carried out, the safety hazards found will be solved in time, accomplish to prevent trouble before it happens, is shut out
The generation of exhausted safety accident.
(10) in Construction stage, the throw-off distances of superstructure, Seismic Isolation of Isolation Layer component and peripheric fixture should be carried out
It checks.
Two, the peace for underpining system tears open and constructs
1, preceding preparation is underpined:
(1) foundation deformation is grasped to the extent of damage of building.Using building tear width as differentiation damaged condition；
(2) live geology and hydrogeologic condition；
(3) by the mechanism of underpinning structure object, construction and stress characteristic；
(4) works underpins situation and the analysis of causes；
(5) possible influence, including season, shoveling, draining, weather etc. in the underpinning construction phase；
(6) during use and the actual conditions of ambient enviroment, as fluctuation in stage, the transition of land drainage condition, environmental greening,
Close to buildings builds, excavation of foundation pit, piling vibration etc. influence.
2, underpinning technique construction point:
(1) according to actual demands of engineering, building is reinforced；Or all or part of branch in building basis is held,
Or structure foundation or basis are reinforced.
(2) it when having newly-built underground engineering under building basis, should transfer the load in newly-built underground engineering.
(3) no matter which kind of situation, underpinning method is all after a part is underpined, and could start another part underpins work
Make, is otherwise just difficult to ensure quality.So it is often ascending to underpin range, gradually expand.
(4) before underpinning construction, first the safety for being underpined building is proved.Require the building institute underpined
Sedimentation, horizontal displacement, inclination, the rate of settling, Size of Crack and spread scenarios and the building about damaged degree of generation are used
Chart and photo are correctly recorded, to determine the safe condition of building.In addition, if crack extension and continuity are more than simultaneously
Dislocation is generated, then to draw attention and adopt remedial measures in time.
It must be monitored during entire underpinning construction, information-aided construction be carried out, to ensure safety and quality.
3, engineering monitoring
Following four aspects work is carried out in monitoring process:
(1) determine that each construction procedure underpined is influenced on caused by sedimentation；
(2) to the motion conditions of each monitoring point caused by the process that underpins, sort out sedimentation (or other observed quantities) with
The relation curve of time, and apply extrapolated forecasting method final settlement；
(3) it is estimated according to subsidence curve and is underpined the degree of safety of building and taken appropriate measures for status, such as
Increase safety support or changes construction method；
(4) the monitoring time limit and measure the requirement of frequency and depend on work progress, especially the load transfer stage daily all
It is required that observation, degree of danger is bigger, then observation should be more frequent.
When directly underpin or crossing process after the completion of, it is still necessary to until continueing to settlement stability for monitoring process.Settlement stability
It is foundation that half a year settling amount, which can be used, no more than 2mm in standard.
4, underpinning method implementation steps
(1) existing building various aspects are reinforced；
(2) all or part of branch in existing building basis is held；
(3) according to requirement of engineering, existing building ground or basis are reinforced；
(4) when having newly-built underground engineering under existing building basis, load should be passed in newly-built underground engineering；
(5) it is necessary to when, remove underpinning structure.
5, support and change method is as shown in Figure 1, Figure 2, Figure 3 and Figure 4, including original structure column 1, and original structure basis 2 underpins 50H type
Steel 3, strong concrete grouting material 4, the shearing resistance stick 5 of diameter 50, very heavy top support 6 and 20H type steel support 7.And basis is held
Platform 8, lower built-in pipe 9, lower embedded board 10,11 shock isolating pedestal 12 of concreting rami posterior inferior seat, upper embedded board 13, upper built-in pipe
14, shoulder pole girder 15, double 9 beams 16, floor 17.
(1), it punches, punches having a size of on the basis of upper and lower buttress size, every side increases by 20 in the two sides wall of column
Centimetre.It is newly pouring levelling on bottom plate afterwards, is placing the support of No. 20 H profile steels, type steel support quantity need to be checked, this engineering is according to setting
The resistance figure provided is counted, desirable 2 to 4 fashioned iron are supported.Support fashioned iron is supported with joist bottom to be connect, and contact surface is not
Less than 50%.
(2), the compactness for the upper joist of guarantee and type steel support can construct by following method.
Fashioned iron is first supported before pouring joist, the steel plate and fashioned iron that 300X300 is arranged at the top of fashioned iron weld, and absolute altitude control exists
Joist bottom, bed die disconnect herein, and steel plate substitutes bed die casting concrete, can also weld dowel on the steel plate and joist is linked to be entirety
Increase stability of strutting system.
(3), pop-up is set a roof beam in place underpins with wall:
Using double fastener joist steel Concrete Beam Reinforced, cross is respectively arranged in column two sides and span centre in sectional dimension about 250 × 450mm etc.
To shoulder pole girder through walls.
Good integrity is had the advantage that using reinforced beam, overall stiffness is big, while solving column and indulging anchor after muscle cutting
Gu the problem of curtailment.
Deck-molding according to underpin load, overall stiffness it needs to be determined that, because span is smaller, and in view of top without departing from room
Outer terrace.Building floor and roof system use prestressed cored slab, and cross wall is load bearing wall, according to underpining load and span selects cross wall
Joist height.
Pop-up is set a roof beam in place, wall transform beams, column bracket change node and horizontally-supported collectively forms the horizontal underpinning of superstructure
Truss plays the role of increase Stiffness Variation of Superstructure, undertakes superstructure vertical load and horizontal loading.
Working procedure are as follows: upper among column two sides and wall to dig 250 × 250 holes --- putting shoulder pole girder lacing wire ---
Binding two sides folder beam steel --- formwork --- pours concrete.
(4), the lower absolute altitude and upper spatial altitude that column needs to cut off are determined after the completion of support, are all removed former constructional column, are protected
Stay former constructional column reinforcing bar.(if the height of installation RB400 shock isolating pedestal is 192 millimeters, then reinforcing bar cutting-height is 200 millimeters,
It is convenient for former constructional column reinforcing bar and the welding of upper and lower embedded board, vibrates displacement after welding for the pump that is not easy to be vibrated when casting concrete
With caused out-of-flatness.) same reinforcing bar can be welded with bind when upper embedded board and larger column original bar spacing to guarantee raw steel
The vertical stress of muscle is on embedded board.Remove former constructional column subregion, intermittent should remove in batches.
(5), laser level marks reinforcing bar truncation in the same plane, with acetylene lancing.
(6), embedded board under isolation cushion is placed after column is abolished, embedded board is connected with former column reinforcing bar spot welding, binding stirrup,
Shuttering pour concrete.It is levelling with two vertical direction of horizontal ruler when embedded board is installed, after fixed, then casting concrete, it puts
Set isolation cushion.
(7), boxing will be put and connect, then use by isolation cushion and upper embedded board, former column reinforcing bar and upper embedded board being installed after three days
Highly 100 small templates pacify former column and carry out formwork erection, are in the milk with a small amount of grouting material, and small plank is removed after 3 hours, and plucking fills
Surface is starched, underpins completed for stage at this time, obtain reliable guarantee safely.
(8), reinforced steel, shuttering, casting concrete anti-seismic floorslab concrete strength are bound up to 70% or more, is removed surplus
Remaining brick wall, subregion, intermittent are removed in batches.
Performance analysis
Direct cost: increase: mainly include isolated component, Seismic Isolation of Isolation Layer and pass through Seismic Isolation of Isolation Layer flexible connection expense
Reduce: superstructure geological process reduces, organization plan adjustment, earthquake resistant construction adjustment etc.
In early days: reduce 5%-10%: classification of setting up defences, earthquake intensity, superstructure scheme, construction area, design and construction technology etc. have
It closes.
Mid-term: maintain an equal level or be increased slightly: classification of setting up defences is higher, and earthquake intensity is higher, and economy is more obvious.
Increase 200--400 Yuan/㎡
This engineering method compared with similar engineering method, due to the project progress of engineering is fast, disturbing factor is few, be conducive to civilized construction,
Various resources can be utilized preferably, can ensure that resident's life, property safety, avoid constructing repeatedly, saved a large amount of engineerings remove,
The expenses such as recovery.The duration of a project is not influenced, preferable economic benefit is produced.
This engineering method provides directiveness effect well for the urban construction of Zhengjiang City.
Application example
The new dam School Building in Yangzhong City was built in 1997,4 layers of brick mix structure.Every building total length of structure is 60m, wide
Degree is 10m, building height 15.500m.4430 ㎡ of the gross area, base form are as follows: pile foundation adds strip foundation beam form.According to
Seismic report is unsatisfactory for category II structure Seismic requirement, ensures safety of the structure under geological process, need to carry out every
Shake strengthening reconstruction.According to the shock design drawing of Jiangsu Province, China international economic and technological cooperation Group Co., Ltd, this engineering is used
Underpinning seismic isolation technology, house surrounding set concrete retaining wall, have clear span not small between retaining wall and building superstructure
In the shock insulation ditch of 1000mm, building superstructure can be free to slide when guaranteeing earthquake.
The first middle school, Yangzhong City liberal-mindedness and vigorous endurance building is 5 floor brick mix structure, is built in 1999, structure overall length is about 30m, and width is about
45.6m, building height are 18.85 m, 2337 m2 of overall floorage, and basis is that a base adds drilled pile.
It is four floor that industry higher vocational and technical schools comprehensive art building, which is with partly-exposed basement, superstructure,
Frame structure is established in 2002, and structure overall length is about 76.6m, and width is about 41m, building height 14.85m, overall floorage
6800㎡.Seismic fortification intensity: 7 degree (0.15g), seismic behavior three-level, Group III place, frame earthquake resistant construction is by 8 degree
(0.20g).Since the building classification is promoted to Class B by Class C, frame seismic behavior is promoted to two classes by three classes, and does not press
Current seismic code requirement is designed, to ensure safety of the structure under geological process, it is special to the structure using as follows every
Shake measure: being arranged laminated rubber isolation cushion at regular intervals under first floor load bearing wall, column, to reduce the seismic response of structure, shock insulation
Pad uses tri- kinds of models of RB400, RB600 and LRB500, the above two are free of lead for retractable pencil, and the latter contains lead for retractable pencil.
The building of the above brick mix structure and frame structure uses the new technology-shock design in Aseismic Design field, and builds
Classification of providing fortification against earthquakes is attached most importance to class of setting up defences, and anti-seismic construction measure is designed by 8 degree (0.2g) in shock-insulating reconstruction, and frame antidetonation is stepped on
Note presses level two design, belongs to that structure is complicated, and the higher project of technical requirements.Major advantage: the surface of a wound is small；Short time limit；Low cost；
Seismic seeurity is high；Influence to order in education is small.
Embodiments of the present invention are described in detail in conjunction with attached drawing above, but the present invention is not limited to described reality
Apply mode.For those of ordinary skill in the art, in the range of the principle of the present invention and technical idea, to these implementations
Mode carries out a variety of variations, modification, replacement and deformation and still falls in protection scope of the present invention.
Claims (4)
1. a kind of shock insulation underpinning structure, including shock isolating pedestal and the system that underpins, the foundation platform of building are equipped with upper buttress, building
Bottom has lower buttress, and the shock isolating pedestal is mounted between buttress and lower buttress；The system that underpins includes that building adds
Fixing structure and type steel support；The shock isolating pedestal has upper embedded board and lower embedded board, and the upper embedded board is fixedly connected on
The bottom of buttress, the lower embedded board are fixedly connected on the top of lower buttress；
The construction method of the shock insulation underpinning structure include shock isolating pedestal installation and underpin system peace tear construction open,
Shock isolating pedestal installation the following steps are included:
Step 1, buttress steel reinforcement cage is bound under shock isolating pedestal；
Step 2, built-in fitting positions, is fixed；
Step 3, lower buttress is poured；
Step 4, couple shock isolating pedestal and built-in fitting；
If lower buttress installation site absolute altitude is higher than prescribed requirement, any excess concrete should be cut, it is again levelling；
If lower buttress installation site absolute altitude is lower than prescribed requirement, using following steps:
A. the lower buttress of erection support, will first dismantle lower shock isolating pedestal；
B. chisel is no less than 20mm under concrete surface, has propped up template, and template to the outer peripheral distance of sleeve is not less than 50mm；
C. it using cushion block and adjusts to designed elevation；
D. with the abundant wetting interface of water, but must not there are bright water before grouting；
E. ingredient stirs；
F. it sits slurry method construction: the grouting material being stirred is poured into the template installed, pour into a little higher than designed elevation of material, stand
Shock isolating pedestal is lifted, extra grouting material is squeezed out；Wet straw bag or rock wool quilt should be covered after grouting in 30min immediately, and protected
Hold wet, grouting material intensity tightens high-strength bolt after reaching 80%；
Step 5, buttress is poured；
It is characterized by: it is described underpin system peace tear open construction include underpin system installation and remove,
Installation method is upper cutting hole --- putting shoulder pole girder lacing wire --- the binding two sides Jia Liang among column two sides and wall
Reinforcing bar --- formwork --- pours concrete；
It is set a roof beam in place by pop-up, wall transform beams, column bracket change node and horizontally-supported collectively form the horizontal underpinning purlin of superstructure
Frame plays the role of increase Stiffness Variation of Superstructure, undertakes superstructure vertical load and horizontal loading；
Lower absolute altitude and upper spatial altitude that engineering method determines that column needs to cut off after the completion of support are removed, former constructional column is all removed,
Retain former constructional column reinforcing bar；Subregion intermittent dismounting in batches is taken to the dismounting of former constructional column.
2. shock insulation underpinning structure according to claim 1, it is characterised in that: the type steel support is H profile steel, H profile steel branch
It supports in joist bottom, contact surface is not less than 50%.
3. shock insulation underpinning structure according to claim 1, it is characterised in that: the shock insulation underpinning structure is used for brick mix structure
Building when, set retaining wall in building surrounding, there are shock insulation ditches between retaining wall and building superstructure.
4. shock insulation underpinning structure according to claim 1, it is characterised in that: the shock insulation underpinning structure is used for frame structure
Building when, laminated rubber isolation cushion is set at regular intervals under first floor load bearing wall, column.
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| CN107724559B (en) * | 2017-10-23 | 2019-07-05 | 南京百西思建筑科技有限公司 | Existing building base isolation reinforcement construction process |
| CN107795144A (en) * | 2017-10-23 | 2018-03-13 | 南京百西思建筑科技有限公司 | The underpinning structure and underpinning construction method of existing building base isolation reinforcement |
| CN107806252B (en) * | 2017-10-23 | 2023-04-11 | 南京分震建筑科技有限公司 | Upper pier structure for seismic isolation and reinforcement of existing building and construction method thereof |
| CN108005404B (en) * | 2018-01-15 | 2023-05-23 | 上海建工四建集团有限公司 | Column underpinning device and construction method |
| CN111519924B (en) * | 2019-02-02 | 2022-06-17 | 华东建筑设计研究院有限公司 | Vibration isolation design construction method for existing building right above subway |
| KR102141552B1 (en) * | 2019-12-02 | 2020-08-06 | 대한민국 | The Method and Apparatus for Preventing Accident In Tunnel |
| CN111075223A (en) * | 2019-12-19 | 2020-04-28 | 江苏鼎达建筑新技术有限公司 | Jacking construction method and jacking device for house reinforcement and deviation rectification |
| CN111622525B (en) * | 2020-05-26 | 2022-02-01 | 中铁大桥科学研究院有限公司 | Thin-wall high-rise hollow tower column cultural relic displacement safety protection method |
| CN112227232B (en) * | 2020-10-16 | 2021-09-28 | 浙江大学 | Pier upright post underpinning method of pier-beam consolidation continuous beam bridge |
| CN113684929B (en) * | 2021-09-01 | 2022-08-23 | 中国建筑一局(集团)有限公司 | Seismic isolation support upper buttress node type steel stiff column overhead fixing structure and construction method |
| CN114991521B (en) * | 2022-06-28 | 2023-09-26 | 四川省建筑设计研究院有限公司 | Design method for underpinning Liang Gezhen reinforcement structure of existing masonry structure |
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| JP6441030B2 (en) * | 2014-11-05 | 2018-12-19 | 大成建設株式会社 | How to add underground facilities |
| CN204608843U (en) * | 2014-12-12 | 2015-09-02 | 北京筑福建筑事务有限责任公司 | Existing masonry structure shrinkage joint place shock isolating pedestal underpinning structure |
| CN105133740B (en) * | 2015-08-05 | 2017-12-29 | 长安大学 | Isolation structure and its construction method applied to country building |
| CN105649100B (en) * | 2016-01-07 | 2017-07-04 | 浙江理工大学 | The base isolation reinforcement method of existing pile foundation building |
| CN105507610B (en) * | 2016-01-07 | 2017-07-04 | 浙江理工大学 | The lower base isolation reinforcement method for digging increasing layer of existing pile foundation building |
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