Summary of the invention
The utility model is at the deficiency of existing building transformation process central sill or post unloading process, a kind of construction tool that is applied to building renovation beam, post unloading is provided, can realize the load displacement special tool when building body pillar rod structure is transformed, can effectively avoid building structure distortion harm, many rough sledding such as prevent floor, wall body slit, leak.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of underpinning tool that is applied to building renovation beam, post unloading, this instrument comprises in beam, the limited charger of pillar support load and the girder span and cushions discharge mechanism, described beam, the limited charger of pillar support load comprise integrated U type corbel and limited load lifting appliance, the top of described U type corbel two side extends to form the lifting flank to both sides respectively, and described limited load lifting appliance matches with described flank;
The buffering discharge mechanism comprises the fixed bearing of regulating flange, screw rod, steel sleeve, bottom offset adjusting flange, band scale screw rod with spacing Chinese lute support, top offset in the described girder span, the described support with described screw rod with spacing Chinese lute joined, described top offset is regulated flange and is matched with described screw rod, described bottom offset is regulated flange and is matched with the fixed bearing of described band scale screw rod, and described steel sleeve connects described top offset and regulates flange and described bottom offset adjusting flange.
Further, described limited load lifting appliance is the spacing jack of band load locking.
Further again, the buffering discharge mechanism also comprises the steel pipe of rotary flange in the described girder span.
The utlity model has following advantage according to what technique scheme obtained:
(1) simple in structure, moral conduct is strong;
(2) cost is low, and is easy to use;
(3) effect is remarkable, and is practical;
(4) the perfect conversion that realizes the constructure body structure load.
The specific embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
This embodiment is First Five-Year Plan layer (local six a layers) building, is an overhaul, improvement project, needs to keep original exterior wall and original five layers and above wooden construction add layer, and original pin below five layers, wooden frame structure need underpin into steel frame.
This underpins engineering and notes following problem:
(1) construction period must guarantee 5 layers and above normal office work, the five floor faces that is to say are not allowing inhomogeneous displacement during the whole construction and after the construction, therefore it is fixed to carry out integral body to five floor face wooden frame plate bodys system, and the assurance floor load evenly is transformed into new steel structure body and fastens;
(2), carry out the load underpinning construction between the bearing wall more than five layers and post need and the new steel work according to designing requirement;
(3) load between the old and new's structure conversion differential settlement that may cause can give that user more than 5 layers bring building structure distortion, floor, wall body slit, many rough sledding such as leak, thereby causes social influences such as complaint, dispute.
At the problems referred to above, the utility model provides a kind of underpinning tool that is applied to the unloading of building renovation beam, post, and this instrument comprises in beam, pillar support load charger and the girder span and cushions discharge mechanism.
Referring to Fig. 1, beam, pillar support load charger 100 comprise integrated U type corbel 101 and limited load lifting appliance 102, wherein, steel plate lathe punching press one-shot forming behind the U type corbel employing 10mm, integral rigidity is good.And the top of U type corbel two side extends to form the lifting flank to both sides respectively, has guaranteed the rigidity of flank like this.
Limited load lifting appliance 102 is the spacing jack of band load locking, and the flank with U type corbel 101 both sides matches respectively.
During use, the both sides jack forces U type corbel both sides to be pushed inward when lifting process, forms a U type fastener, embraces wooden frame and strengthening steel slab firmly.
Integrated U type corbel has not only solved space problem, and has protected wooden construction effectively as a pallet.In the load transfer process, need to promote original wooden frame.If directly do not promote wooden construction, cause easily that the wooden construction concentration of local is stressed to cause structural deterioration by U type corbel.Adopt U type corbel to carry out load and transform, can increase lifting surface area, stressed to become area load stressed from point load, protects the safety of wooden construction to the full extent.
Simultaneously, can guarantee that with spacing lifting appliance hoist load remains in the design load in lifting process, effectively prevent the harm that causes because of hoist load is excessive, guarantee structural safety.
Integrated U type corbel safety checking computations are as follows:
1. fixed simulation is adopted in U type corbel bottom;
2. suppose to shelve level bottom the U type corbel, stressed even.Suppose the jack effect after U type corbel two side wing edges are placed backing plate, stressed even.Therefore U type corbel is subjected to even area load effect, chooses wherein a slice and simulates.Safety in the U type corbel checking computations lifting process of the long 10mm of model employing.
Set up model:
1) adopt MIDAS/CIVIL to set up FEM (finite element) model, utilize plate unit simulation U type corbel, get the 10mm length computation, U type corbel model is totally 68 unit, 138 nodes.
U holder springform is measured 210000N/mm2.
3) fringe conditions
Fixed simulation is adopted in U type corbel bottom.
Model is not considered the weight of U type corbel own, only considers the lifting force effect.
Experimental result shows: increase by 1 ton lifting force, lift 1mm on the structure.The structure lifting capacity is a standard with 3mm in this engineering, so total lifting force adopts 3 tons in the model, and evenly distributes along its length, is applied to the both sides of model in the mode of evenly distributed load, and the area load size is 13.8N/mm2.
U type corbel is under load action, and maximum distortion occurs in both side ends in the x plane, and shift value is 1.9mm.
The U holder is under load action, and maximum effective stress appears at the web place in the x plane, and stress value is 146.4MPa.
By the aforementioned calculation data as can be seen, under the condition of basic assumption, when wooden frame was subjected to the 13.8N/mm2 area load, maximum displacement was 1.9mm, and maximum stress 146.4MPa is in safe range.
Because this improvement project adopts steel framed structure to underpin the construction technology of brace structure, wooden construction and steel work are flexible material, be subjected to deform behind the load, if be subjected to the transient load effect, easily cause wooden construction to be subjected to displacement even the disturbance of damage and superstructure.For fear of these problems, the utility model has designed a cover buffering discharge mechanism.
Referring to Fig. 2, buffering discharge mechanism 200 comprises in the girder span: the fixed bearing 207 of regulating flange 202, screw rod 203, steel sleeve 204, bottom offset adjusting flange 205, steel pipe 206, band scale screw rod with spacing Chinese lute support 201, top offset.
Support 201 with spacing Chinese lute: block wooden frame with spacing Chinese lute support, guarantee closely to contact with wooden frame, the protection wooden frame is not damaged.
Top offset is regulated flange 202 and screw rod 203: be mainly used in the spacing Chinese lute support 201 of support and accommodation zone, wherein screw rod 203 with join with spacing Chinese lute support 201, top offset is regulated flange 202 and is matched with screw rod 203, regulates the height of support during use by the rotation of flange on screw rod.
Bottom offset is regulated flange 205 and steel pipe 206: bottom offset is regulated flange 205 and is matched with the fixed bearing 207 of band scale screw rod, and steel pipe 206 is convenient to rotation adjusting flange.By promoting steel pipe lever rotary flange, the screw rod of flange on fixed bearing 207 moves up and down, thereby makes support can slowly regulate height.
Steel sleeve 204: adopt steel sleeve 204 to connect upper and lower transposition joint method 202,205, select to adopt the steel sleeve of different length to regulate the support effective height.
The fixed bearing 207 of band scale screw rod: mainly be the bottom support part, aspire for stability, firmly, have a scale.The purpose that has scale is to guarantee a plurality of discharge mechanisms when a support position uses, and requires to carry out synchronously, shows that by scale rotating identical angle controls stroke, is converted to flashy load the process that progressively loads.
The concrete use of buffering discharge mechanism is as follows in the above-mentioned girder span:
The first step is installed, and rotary flange holds out against wooden frame (eliminating the stressed self-deformation amount of material);
Second step was being guaranteed the stressed load transfer of former pin to discharge mechanism, removed pin;
Oppositely slow rotary flange of the 3rd step discharges the discharge mechanism load, notices that angle, speed need synchronously.
The use of buffering discharge mechanism has the following advantages in this girder span:
1, transient change is changed into slow process, effectively protect structural safety;
2, the whirligig of band scale can guarantee that a plurality of discharge mechanisms carry out synchronously, guarantee the structural safety in the transfer process in uninstall process.
More than show and described basic principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the manual just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof