The method of tensioning the reinforcing element with the anchor device

 

(57) Abstract:

Usage: construction in prestressed constructions with tension reinforcement in concrete. The inventive method of tensioning the reinforcing element with the anchor device made in the form of pressovannoe sleeves, includes putting in rebar sleeve, installation of hydraulic jacks, the tension reinforcement and the subsequent crimping sleeve, having first reinforcing rod until its tension is placed a washer and a sleeve with additionally inserted liners, and after the tension of the rebar to the design level first do partial crimping sleeves compressive force to the end face on the site, not exceeding 0.1 . . . 0.2 length sleeve, to lock it in the washer, then the compression force is removed and transmit the force to the tension reinforcement to the liner by means of a compressive longitudinal force at the end of the sleeve and the rod of the hydraulic cylinder, and then proizvodyat final crimp sleeve over the entire length and transmit the force to the tension reinforcement to anchor the device to obtain liners stretch and sleeve compression. In addition, the final crimp sleeve over the entire length produced by moving izobretenie relates to the construction and can be used in pre-mutagenic structures with tension reinforcement in concrete.

A known way to the tip of the beam reinforcing wires to pull his or anchoring in the manufacture of prestressed concrete structures using metal sleeves, into which are pressed the end of the beam by passing the liner through a die by bursting its compressive force to the end [1]

However, this anchor has a limited load capacity.

The closest in technical essence and the achieved result is a method of manufacture of anchors for flexible elements, mainly beams pre-stressed reinforcement through the crimp sleeves, including a preliminary tension of the flexible element and the subsequent crimping sleeves on it [2]

The disadvantage of this method is that not ensured enough to secure the anchor to the flexible reinforcing element, as in the transverse crimping the metal anchor the most intense and tightly "flows" into the spaces between the outer wires in the direction of action of the crimp, and with the removal of this line efficiency crimp drops due to extrusion of the metal in the lateral direction between the pressing dies.

the increase of the bearing capacity anchoring.

The solution to this problem is provided by the fact that in the way of tension reinforcement element with anchor device made in the form of pressovannoe liners, including putting on rebar sleeve, installation of hydraulic jacks, the tension reinforcement and the subsequent crimping sleeves, pre-reinforcing rod until its tension is placed a washer and a sleeve with additionally inserted liners, and after the tension of the rebar to the design level first do partial crimping sleeves compressive force to the end face on the site, not exceeding 0.1.0.2 length sleeve, to lock it in the washer, then the compression force is removed and transmit the force to the tension reinforcement to the liner by means of a compressive longitudinal force at the end of the sleeve and the rod of the hydraulic cylinder, and then produce the final crimp sleeve over the entire length and transmit the force to the tension reinforcement to anchor the device to obtain liners stretch and sleeve compression. In addition, the final crimp sleeve over the entire length produced by the movement of the housing relative to the hydraulic cylinder installed in the project the position of the anchor.

When solving this task is achieved technical episose to increase angerous the ability of the liner due to a larger clutch liners with valve and the most intense and dense "wicking" of the metal sleeve in the direction perpendicular to the action of the crimp, which, in turn, increases the bearing capacity of anchoring. In addition, the longitudinal compressive force at the end of the sleeve and the rod of the hydraulic cylinder allows locking liner with inserts in the project position relative to the rebar, which improves the accuracy of anchoring and consequently increase the accuracy of the process of tension reinforcement. When this final crimp sleeve over the entire length by moving the housing relative to the hydraulic cylinder installed in the project the position of the anchor allows due to maintaining a constant length sleeves to ensure the most dense filling of the voids between the sleeve and valve, with a corresponding increase in the strength of the anchor node.

In Fig. 1 shows an anchoring device at the time of pressurization (longitudinal compression) through the die plate of Fig.2 the process of polerowanie anchor in tension reinforcement (stage I), Fig.3 section a-a in Fig.2; Fig.4 and 5, respectively, stages II and III of the process polerowanie anchor device on the tight fixture.

The reinforcing element includes a reinforcing rod or rope, one end of which Sankaran known anchoring device is titsa its tension by hydraulic jacks, is the anchor device in the form of pressovannoe liners with liners. This anchoring device includes an anchoring sleeve 1 and the pads 2 located between the sleeve 1 and the armature 3 and oppressively on tight the valve 3 by punching through a Spinneret 4. The inserts 2 are in the form of crackers, conical inserts, folded around the circumference of the corrugated plates, spirals, etc., and serve to improve the adhesion of the valve with the sleeve to prevent slipping of the latter with the valve in the perception of effort reduction.

The method of tensioning the reinforcing element with the anchor device is as follows.

The anchoring device includes a sleeve 1 with liners 2, is fixed with an emphasis in column 5, the channels 6 and between precast floor slabs skipped rope fittings 3. Along the axis of the armature 3 from the outer face of the column 5 is the anchor washer 7 and the actual anchor device comprising opressively the sleeve 1 and the liners 2. The valve 3 with an emphasis in column fortified also gidrotartrat special design to perform tension reinforcement and crimping anchors. In the process of polerowanie anchor sleeve 1 is maintained under constant with whom and through the clutch sleeve 1 with liners 2 and valve 3. Sleeve 1 becomes pre-compressed. As a result of partial elongation of the sleeve 1 when unloading the liner 2 is also lengthens and becomes in turn a pre-stretched.

The method of tensioning the reinforcing element with the anchor device on the valve are produced in three consecutive stages.

In the first stage initially between precast floor slabs and channels 6 columns 5 are pulled reinforcing rope element with one pressovanny anchor on the passive side (i.e. the side opposite to the tension) which abuts through the armature disc in the outer face of the column. The free end of the armature 3 is brought out over the edge of the column on the side where the tension. Next to the valve 3 is wrapped with anchor washer 7 closed and gidrotartrat special design.

Inside the hydraulic cylinder, the valve 3 is passed sequentially through the housing 8 containing the die 4, the anchoring sleeve 1 with liners 2 inserted into the housing 8 to pass through the valve box 9, the rod 10 and platform 11. The rod 10 has the ability reciprocating movement within the casing of the hydraulic cylinder due to the rigid connection with the piston 12 of the cylinder 13. With cation-through sleeve 1 through the die 4. On the other hand on the rod 10 reinforced collet clamp 16 stop 17 of the transverse deviations of the clip, which provide a strictly rectilinear movement of the latter along the guide elements 18, and prevents the jamming of the rod 10 in the cylinder 13. These elements 18 also serve to transfer the load from plaform 11 and the second collet clamp 19 on the cylinder 13 and the housing 8 of the hydraulic cylinder. On the collet clamp 19 is also mounted device 20 release of the clamp from the stress of compression. The housing 8 of the hydraulic cylinder is also at the base provided with a slot 21 for visual inspection of the point of focus pressovannoe part of the liner 1 in the anchor washer 7.

After stringing on the armature 3 anchor washer 7 and the hydraulic cylinder of the described construction of the latter is attached to the valve with an emphasis in the outer face of the column 5 with collet clamps 16 and 19. Next is the tension of the armature 3 to the design size by pulling the valve and its alternate interception clamps 16 and 19. When the piston 12 and the rod 10 moving from column 5 with the increase of the pressure in the cavity 1 camera Jack. After the tension of the valve 3 begins the process of fixing the anchoring device to the valve.

When this force 8. Further reduce the pressure in the cavity I and increase the pressure in the cavity II. As a result, the rod 10 of the piston 12 is moved in the casing and pushes the thrust element 14 of the anchor sleeve 1 is inserted in it inserts 2 until it stops in polerowanie matrix.

In the second stage increases the pressure in the cavity II of the cylinder so that the piston 12 through the stem 10 and the thrust element 14 began to push (fileroot) sleeve 1 with liners 2 through polerowanie matrix. Punching to produce until pressovannaya portion of liner 1 will not run through the armature disc 7 in column 8. This situation is monitored visually through the slots 21 in the supporting part of the housing 8 of the Jack, and then reset the pressure in the hydraulic cylinder and removal efforts compression. At the same time for the length of the zone pressovannoe part of the anchor is part of the sleeve extending beyond the end surface of the nozzle that is closest to the armature disc, this length may not exceed 0,20 length sleeves.

At the third stage unit 20 turns off (release) collet clamp 19. As a result, the tension force is transmitted to the Chuck 16 and the rod 10, which leads to preservation of the longitudinal compression of the sleeve 1 and the exemption from army 11). This also decreases the pressure in the cavity of the second cylinder 13. Then start to raise the pressure in the cavity II and because of rigid supporting rod 10 via the thrust element 14, the sleeve 1 and the washer 7 on the column and the free state of the other parts of the Jack housing 8, the cylinder 13, the guides 18 and the platform 11) is slipping (pulling off) the external circuit of the Jack relative to the rod 10. In the process of sliding the die 4 is moved on the remaining neobrazovannoi and under longitudinal compression of the cartridge case 1, which leads to the final crimping the anchor sleeve 1 on the valve 3.

If the previous two stages of the fixation anchor device occurred when moving the sleeve relative to the stationary housing 8 and polerowanej matrices 9, the third stage is already moving the enclosure 8 and matrix relative to the stationary sleeve 1.

After completion polerowanej matrices on the sleeve 1 produce the release collet clamp 16 with a full transfer of tension on the anchor and moving the Jack to the next reinforcing element. When the sleeve 1 is partially extended with the preservation of the common pre-compressed state, and the liners 2 partially races is Lennie operations for the next reinforcing element.

It should be noted that the crimping sleeve without pre-compression is not recommended for a length exceeding 0,20 length sleeves. As shown by the results of the pilot opressovok when the length of the crimp without longitudinal compression by more than 0.10.0,20 length liner starts slipping already pressovannoe part on the valve violation of contact with the valve, with a smaller length occurs the complexity of the education edge at the exit pressovannoe part of the anchor from polerowanie matrix.

The application of this technical solution allows the implementation to save the expense of metal on the anchor sleeves and washers to reduce the complexity of the process of prestress reinforcement simultaneously improving the accuracy and maintainability of the tensioning process.

1. The METHOD of TENSIONING the REINFORCING element WITH the ANCHOR DEVICE made in the form of pressovannoe liners, including putting on rebar sleeve, installation of hydraulic jacks, the tension reinforcement and the subsequent crimping of the sleeve, wherein the pre-reinforcing rod until its tension is placed a washer and a sleeve with additionally inserted liners, and post-tensioning reinforcement Stegna to the design level now is Liz, to lock it in the washer, then the compression force is removed and transmit the force to the tension reinforcement to the liner by means of a compressive longitudinal force at the end of the sleeve and the rod of the hydraulic cylinder, and then produce the final crimp sleeve over the entire length and transmit the force to the tension reinforcement to anchor the device to obtain liners stretch and sleeve compression.

2. The method according to p. 1, characterized in that the final crimp sleeve over the entire length produced by the movement of the housing relative to the hydraulic cylinder installed in the project the position of the anchor.

 

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FIELD: construction.

SUBSTANCE: tendon comprises additional external reinforcing contour in the form of cylindrical rigid steel or nonmetal cartridge that is installed symmetrically relative to prestressed reinforcement and filled with concrete of at least B 15 grade; with concrete prestressing force in element within the limits from 5 N/sq.mm to 40 N/sq.mm and force of side thrust in cartridge from prestressing within the limits from 0 to 300 N\sq.mm. External cartridge may be arranged with rectangular or square section, and prestressed reinforcement - from coal plastic; at that reinforcement made of steel ropes may be installed in flexible nonmetal tubes with lubricant inside.

EFFECT: increased reliability.

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EFFECT: reduced moment of deflection directly affecting the connective part due to the load over the said first anchor bolt.

18 cl, 19 dwg

FIELD: construction industry.

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EFFECT: perfected design.

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