A kind of pre-stress stretching device of fibre sheet material
The utility model relates to structural strengthening technical field of construction, particularly relates to a kind of pre-stress stretching device of fibre sheet material.
In recent years, fibre sheet material, with the particular advantages such as its lightweight, high-strength (carbon fiber strength is about steel 10 times), corrosion-resistant, easy construction, is applied to structure repair and field of reinforcement more and more widely.But, while high-intensity fiber sheet material reinforcement means is promoted on a large scale, researcher also finds that the conventional reinforcement means of high-intensity fiber sheet material also exists obvious technological deficiency: because the modulus of elasticity of high-intensity fiber sheet material is only suitable with steel, when tensile reinforcement is surrendered, its intensity just plays less than 20%, only have after component serious cracking and distortion obviously increase, just may give play to more intensity level, but now component often can not meet normal instructions for use.Therefore, the pre-stressed construction method adopting high-intensity fiber sheet material in construction at present more.
For common high-intensity fiber sheet material, if adopt effective prestress tensioning equipment to carry out pre-stress construction, just can give full play to the intensity level of high-intensity fiber sheet material, improve cracking load and the yield load of component, alleviate the Stress resort problem of high-intensity fiber sheet material, effective delayed fracture is carried out, and reduces deflection deformation, significantly improves the service behaviour of structure.
Pre-stress fibre sheet material ruggedized construction is a novel reinforcing technique, three kinds of pre-stressed construction methods are defined at present: 1) before the non-prestressed fibre sheet material of stickup, allow component play antiarch, then paste fibre sheet material, after release antiarch, make fibre sheet material produce prestressing force; The stress distribution of this kind of method generation is lower.2) in strenthening member, arrange permanent ground tackle, fibre sheet material carries out stretch-draw using strenthening member itself as reaction frame, and be pasted onto after stretch-draw is complete on component, ground tackle is retained in original position; This kind of method complex structure, difficulty of construction is large, and ground tackle cannot be reused, and adds disposable input cost.3) by the pre-pretensioning fibre sheet material of outside reaction frame, then paste on the component of reinforcing, after treating maintenance, cut off fibre sheet material at component root and carry out putting, reach the effect to strenthening member Shi Hanzhang.The method is simple, and input cost is low, but market does not also occur the pre-stress stretching device being easy to construction, and the stretching force size applied is uncontrollable.
Summary of the invention
The utility model provides a kind of flexible and convenient to use, is easy to the pre-stress stretching device of the fibre sheet material of site operation, can carry out quantified controlling, to reach the requirement giving full play to high-intensity fiber sheet strength value to the stretching force applied.
In order to achieve the above object, the utility model realizes by the following technical solutions:
A kind of pre-stress stretching device of fibre sheet material, comprise adjustable seats, torque-indicating wrench, sleeve and clamping plate, described adjustable seats is made up of the pedestal one connected by bolt and nut and pedestal two, fibre sheet material is fixedly clamped on the side pedestal of adjustable seats by clamping plate, coordinates sleeve adjusting nut to change pedestal spacing stretch-draw fibre sheet material by torque spanner.
Described pedestal one and pedestal two are made by angle steel, opposing setting, and two ends establish at least 1 group bolt and nut to be fixedly connected with respectively.
Compared with prior art, the beneficial effects of the utility model are:
Utilize the relation formula of physical law that friction factor under identical contact surface condition is equal and nut torque value and screw rod pulling force, the prestressing force of fibre sheet material is pulled through bolt and nut and regulates, and screw rod value of thrust controls by torque-indicating wrench; Apparatus structure is simple, and installing/dismounting is flexible, and cost of manufacture is low and reusable; Construction method is simple, and single workman can operate, and stretching force precise control, efficiency of construction significantly improves.
Accompanying drawing explanation
Fig. 1 is front view of the present utility model.
Fig. 2 is lateral view of the present utility model.
In figure: 1. torque-indicating wrench 2. sleeve 3. screw rod 4. nut 5. packing ring 6. clamping plate 7. pedestal 1 pedestal 2 9. concrete column 10. concrete beam 11. fibre sheet material.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described further:
See Fig. 1-Fig. 2, it is structural representation of the present utility model, the pre-stress stretching device of a kind of fibre sheet material of the utility model, comprise adjustable seats, torque-indicating wrench 1, sleeve 2 and clamping plate 6, described adjustable seats is made up of the pedestal 1 connected by screw rod 3 nut 4 and pedestal 28, fibre sheet material 11 is fixedly clamped on the side pedestal of adjustable seats by clamping plate 6, coordinates sleeve 2 adjusting nut 4 to change pedestal 7,8 spacing stretch-draw fibre sheet material 11 by torque spanner 1.
Described pedestal 1 and pedestal 28 are made by angle steel, opposing setting, and two ends establish at least 1 group screw rod 3 nut 4 to be fixedly connected with respectively.
The operating principle of the pre-stress stretching device of a kind of fibre sheet material of the utility model is, the prestressing force of fibre sheet material 11 is pulled through screw rod 3 nut 4 and regulates realization, and its fastening pulling force is controlled by torque-indicating wrench 1.
The using method of the pre-stress stretching device of a kind of fibre sheet material of the utility model is as follows:
According to being reinforced the thickness determination pedestal 1 of component, the length of pedestal 28 and the length of screw rod 3, between pedestal 1, pedestal 28, adjustable distance is 100 ~ 200mm;
Fastened with clamping plate 6 on side pedestal 7/8 need fibre sheet material 11 end clips of stretch-draw,
Spiral shell 3 boom end region uniform application lubrication oil within the scope of adjustment stroke, pedestal 1, pedestal 28 are sleeved on concrete column 9 by screw rod 3 nut 4, it regulates direction consistent with fibre sheet material 11 stretch-draw direction, presetting nut 4, fibre sheet material 11 is tightened, and adjustable seats is relative with concrete column 10 fixing;
Before construction, adopt and on all four instrument, measured piece and condition during construction, the fastening pulling force T of screw rod of more than three groups is carried out at scene and the ratio of nut torsion P is tested, according to formula:
In formula: K-nut friction factor; The fastening pulling force of T-; P-nut torsion; D-nut nominal diameter;
Calculate and often organize nut friction factor K, and obtain several groups of test back nut friction factor average K
on average, then according to formula:
In formula: P
if-setting nut torsion; T
if-set fastening pulling force; N: bolt and nut group number;
Try to achieve setting nut torsion P
if, this value is single nut torque value, and generally, adjustable seats both sides respectively establish one group of bolt and nut to meet the demands, i.e. N=2.
Be arranged on by sleeve 2 on nut 3, with torque spanner 1 adjusting nut 4, adjustment bearing pedestal spacing reduced, both sides nut 4 alternately regulates, until torque spanner 1 shows numerical value reach setting nut torsion numerical value P
ifin time, stops, and namely completes fibre sheet material 11 tension operation.
Complete construction simulation process during test, the screw rod 3 of employing, nut 4, packing ring 5 model are all consistent with during construction, the screw rod 3 end regions uniform application lubrication oil within the scope of adjustment stroke.
Fibre sheet material 11 is by the pre-pretensioning of pre-stress stretching device of a kind of fibre sheet material described in the utility model, then paste on the component (as concrete beam 10) of reinforcing, after treating maintenance, cut off fibre sheet material at component root to carry out putting, reach the effect to strenthening member Shi Hanzhang.
By the engineering practice at scene, the utility model can make efficiency of construction significantly improve.