Outer prestress system and its construction process

An external prestressing and systematic technology, applied in the direction of transmission elements or pulley ropes or cables, textile cables, belts/chains/gears, etc., can solve the problem of difficult single tension, single cable replacement, and affecting the service life of the cable body , can not achieve single tension and other problems, to achieve the effect of easy cable replacement, increased anchoring performance, and small gaps

Inactive Publication Date: 2004-01-21
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problems to be solved by the present invention are: Existing in the existing external prestressing system: 1. Both the external prestressing steel cable and its protection system need to be grouted and heavy, and it is not easy to stretch and change a single cable, and the construction period Longer; 2. There is friction between the steel strand and the steering gear, and between the steel strand and the steel strand, which affects the service life of the cable body and cannot achieve single tension and single cable replacement; 3. When the prest

Method used

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  • Outer prestress system and its construction process
  • Outer prestress system and its construction process
  • Outer prestress system and its construction process

Examples

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Effect test

Embodiment 1

[0046] An external prestressing system, including two anchor segments I at both ends, two steering segments III, and three free segments II between the anchor segments I and steering segments (see figure 1 , figure 2 );

[0047] The anchoring section I is composed of two parts, an anchor head and an anchoring area. The anchoring head part includes a cable body, a sealing cover 1, an anchor plate 3, and a clip 2. The anchoring area includes a spiral rib 4, an anchor backing plate 5, Inner bushing 6, embedded pipe 7, grouting material 14, sealing plate 12;

[0048] The free section II is composed of a cable body 11 covered with a protective jacket 8, and the cable body 11 uses high-strength steel strands as raw materials for enhanced anti-corrosion treatment of epoxy full-sprayed unbonded reinforcement as prestressed reinforcement The protective jacket 8 can be a PE sheath, steel pipe or PVC pipe. The protective jacket 8 of the free section of the external prestressing system...

Embodiment 2

[0053] An external prestressing system, the basic structure of which is the same as that of Embodiment 1, the difference is that the anchor segment I is a movable bush type clip anchor, and the anchor head part also has a gasket ring 27, There is a replaceable protective tube 28 in the anchor backing plate 5, and the large end of the replaceable protective tube 28 stretches out from the anchor backing plate 5. The replaceable protective tube 28 is a transition fit, the replaceable protective tube 28 can move axially, the gasket ring 27 is fixed on the end face of the anchor plate 5 by screws, and the sealing plate 12 is installed on the small end of the replaceable protective tube 28 (see Figure 8 ), the replaceable protective tube 28 is made of metal materials such as steel plates, aluminum plates or plastic materials such as polytetrafluoroethylene or polyethylene or high-density polyethylene.

Embodiment 3

[0055] An external prestressing system, the basic structure of which is the same as that of Embodiment 1 or Embodiment 2, except that the shock absorber 9 installed at the appropriate position of the cable body of the free segment II is a single compression damper Vibrator (see Fig. 9, Fig. 10); This shock absorber consists of two semicircular outer sheaths 29 1 、29 2 , 6 pieces of damping spacers 30 1 、30 2 , ... 30 6 , sheath ears 31, and connecting bolts 33, the damping gasket 30 in the middle 2 、30 3 、30 4 、30 5 There are arc-shaped grooves on both sides, and the arc-shaped grooves of two adjacent gaskets are butted to form a circle, and the shock-absorbing gasket 30 close to the outer sheath 1 、30 6 There is an arc-shaped groove on one side, and an arc-shaped groove matching the circular outer sheath on the other side. Two semicircular outer sheaths 29 1 、29 2 The butt joint is connected into one body by bolts 33 and nuts 32, and the damping pads can be made of ...

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Abstract

The outer prestressed system consists of anchoring section I comprising anchor head and anchoring part, free section II and steering section III. The steering section has steering unit comprising steering pipe and 2-120 parallel guide pipes inside the steering pipe, and all the guide pipes in certain rigidity and flexibility are connected via connecting board into one integral. The anchoring section has movable lining and clamping piece forming anchoring system; and the free section consists of outer protecting sleeve, cable and pressing damper installed in proper position of the cable. The construction process of the outer prestressed system includes prefabricating sections, installing steering unit, installing anchor head, single piece tensing, grouting and painting, installing damper, installing PE casing and other steps. The system has the advantages of single piece tensing, homogeneous stress of twisted steel cable, long service life, etc.

Description

1. Technical field: [0001] The invention relates to a prestressing system, in particular to an external prestressing system and a construction method thereof. 2. Background technology: [0002] The external prestressing system includes an anchoring segment I composed of anchor heads and anchoring parts at both ends, several free segments II, and several steering segments III. The main parts are: 1. External prestressing steel cables and their Protection system, 2. External prestressed steering device, 3. Anchorage system of external prestressed steel cable; 4. External prestressed shock absorber; the existing system of external prestressed steel cable and its protection system mainly includes the following two types : The first type: adopt the form of smooth steel strands and PE casing to fill the grout, the grout is easy to crack under the action of dynamic load, and the anti-corrosion effect is not good; the second type: use no bonding ribs, and pour the grout into the PE ...

Claims

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Application Information

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IPC IPC(8): F16G11/00
Inventor 徐栋谢正元强壮
Owner TONGJI UNIV
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