CN217871405U - Slow-bonding prestress rib bundle, tensioning end anchorage device and fixing end anchorage device - Google Patents

Abstract

The utility model provides a slow bonding prestressing force muscle bundle, stretch-draw end ground tackle and stiff end ground tackle relates to prestressed concrete technical field, and this slow bonding prestressing force muscle bundle includes: two or more prestressed tendons which are arranged in parallel and form a tendon; the protective sleeve is sleeved outside the tendon; and the delayed coagulation adhesive is filled between the tendon and the protective sleeve to form a filling layer. The utility model provides a slow bonding prestressing force muscle bundle and stretch-draw end ground tackle, stiff end ground tackle thereof can provide more prestressing force and can realize the crowd and draw the construction of crowd's anchor.

Description

Slow-bonding prestress rib bundle, tensioning end anchorage device and fixing end anchorage device

Technical Field

The utility model relates to a prestressed concrete technical field, in particular to slow bonding prestressed tendon and stretch-draw end ground tackle and stiff end ground tackle thereof.

Background

Among the prestressing techniques, the slow adhesion prestressing technique is a prestressing technique which is developed rapidly after the adhesion prestressing and the non-adhesion prestressing. The slow bonding prestress is that the prestressed steel strand is free in stretching deformation and does not bond with the surrounding slow-setting adhesive in the construction stage, and the prestressed reinforcement is bonded with the surrounding concrete through the cured slow-setting adhesive in a predetermined period after the construction is finished.

The slow-bonding prestress technology has the advantages of simple production and construction process of the unbonded prestress technology, overcomes the defects of complex construction process and limited use condition of the bonded prestress technology, has good mechanical property comparable to the bonded prestress, and is widely applied to prestressed concrete structures of all civil construction engineering such as highway bridges, railway bridges, municipal engineering, hydraulic engineering, ocean engineering, special engineering and the like. Along with the wide application of the slow bonding prestressing force technology, the existing slow bonding prestressing tendons are of a single prestressing tendon structure, and a single tensioning is arranged during use.

In view of this, the utility model discloses the people designs out a slow bonding prestressing tendons and stretch-draw end ground tackle and stiff end ground tackle according to the production design experience of engaging in this field and relevant field for a plurality of years to solve the problem that prior art exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a slow bonding prestressing tendons and stretch-draw end ground tackle and stiff end ground tackle thereof can provide more prestressing force and can realize that the crowd draws the construction of crowd's anchor.

In order to achieve the above object, the utility model provides a retard bonding prestressing tendons restraints, wherein, retard bonding prestressing tendons includes:

two or more prestressed tendons which are arranged in parallel and form a tendon bundle;

the protective sleeve is sleeved outside the tendon;

and the delayed coagulation adhesive is filled between the tendon and the protective sleeve to form a filling layer.

The slow bonded prestressed tendon as described above, wherein the slow bonded prestressed tendon comprises two to seven of said prestressed tendons.

The slow-bonding prestressed tendon bundle is characterized in that the prestressed tendon is a prestressed strand or a prestressed wire.

The slow-bonding prestressed tendon as described above, wherein the protective sheath is a high-density polyethylene protective sheath.

The slow-bonding prestressed tendon comprises a protective sleeve, a plurality of transverse ribs and a plurality of reinforcing ribs, wherein the plurality of transverse ribs protrude outwards from the outer wall of the protective sleeve, the transverse ribs are arranged along the circumferential direction of the protective sleeve, and the plurality of transverse ribs are sequentially arranged at intervals.

The slow-bonding prestressed tendon comprises a protective sleeve, wherein the outer wall of the protective sleeve is provided with at least one outward-protruding longitudinal rib, and the longitudinal rib is arranged along the length direction of the protective sleeve.

The utility model also provides a stretch-draw end ground tackle of slow bonding prestressing tendons for the stretch-draw is as above slow bonding prestressing tendons restraints, wherein, stretch-draw end ground tackle includes the sealed cap of stretch-draw end, stretch-draw end anchor backing plate component and stretch-draw end anchor slab, stretch-draw end anchor backing plate component has the inner chamber that the axial is link up, set up on the outer wall of stretch-draw end anchor backing plate component with the slip casting passageway that the inner chamber links to each other, stretch-draw end sealed cap with stretch-draw end anchor backing plate component is located respectively the both ends of stretch-draw end anchor backing plate component are sealed the inner chamber, set up the anchor through-hole more than two or two on the stretch-draw end anchor slab, each anchor through-hole and each the prestressing tendons one-to-one sets up, each be equipped with in the anchor through-hole and be used for pressing from both sides tightly the clamping piece of prestressing tendons, the one end of slow bonding prestressing tendons runs through in proper order stretch-draw end sealed cap with the inner chamber, slow bonding prestressing tendons each the prestressing tendons correspond the prestressing tendons and run through the anchoring through-hole and by the clamping piece fixed clamping piece.

The utility model also provides a stiff end ground tackle of slowly bonding prestressing force muscle bundle for it is fixed as above slowly bonding prestressing force muscle bundle, wherein, stiff end ground tackle includes stiff end anchor slab and two or more than two extrusion anchors, set up two or more than two anchor through-holes on the stiff end anchor slab, each extrusion anchor, each anchor through-hole respectively with each the prestressing tendons corresponds the setting, each the prestressing tendons corresponds to run through the anchor through-hole with the extrusion anchor is fixed to be connected, slowly bond each of the other end of prestressing force muscle bundle the prestressing tendons corresponds and runs through the anchor through-hole and quilt the extrusion anchor is fixed.

The fixed-end anchorage device of the slow bonding prestressed tendon, as described above, wherein the fixed-end anchorage device further comprises a fixed-end anchor backing plate member and a fixed-end sealing cap, the fixed-end anchor backing plate member has an inner cavity which is axially communicated with the fixed-end anchor plate, the outer wall of the fixed-end anchor backing plate member is provided with a grouting channel connected with the inner cavity, and the fixed-end sealing cap is arranged at the other end of the fixed-end anchor backing plate member and seals the end.

Compared with the prior art, the utility model has the following characteristics and advantages:

the utility model provides a slow bonding prestressing tendons restraints and stretch-draw end ground tackle and fixed end anchor thereof only restraints through a slow bonding prestressing tendons and can realize that the crowd pulls the crowd anchor, has overcome slow bonding prestressing tendons and has singly arranged single stretch-draw, shortcoming that the efficiency of construction is not high.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation.

Fig. 1 is a schematic structural view of a slow bonding prestressed tendon provided by the present invention;

fig. 2 is a cross-sectional view of a transverse rib of a retard-bonded prestressed tendon according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a non-transverse rib of a retard-bonded prestressed tendon according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a pre-stressed tendon with a slow-bonding function according to another embodiment of the present invention;

FIG. 5 is a cross-sectional view of a non-transverse rib of a slow adhesion pre-stressed tendon according to another embodiment of the present invention;

FIG. 6 is a cross-sectional view of a pre-bonded prestressed tendon according to another embodiment of the present invention;

FIG. 7 is a cross-sectional view of a non-transverse rib of a retard-bonded prestressed tendon according to yet another embodiment of the present invention;

FIG. 8 is a cross-sectional view of a pre-bonded prestressed tendon in a fourth embodiment of the present invention;

FIG. 9 is a cross-sectional view of a fourth embodiment of the present invention, showing a non-transverse rib of the retard-bonded prestressed tendon;

FIG. 10 is a cross-sectional view of a fifth embodiment of the present invention showing the location of the transverse ribs of the slow adhesion pre-stressed tendons;

FIG. 11 is a cross-sectional view of a fifth embodiment of the present invention showing non-transverse ribs of the slow adhesion pre-stressed tendons;

FIG. 12 is a cross-sectional view of a sixth embodiment of the slow adhesion pre-stressed tendon of the present invention;

FIG. 13 is a cross-sectional view of a sixth embodiment of the present invention, showing non-transverse ribs of the retard-bonded prestressed tendon;

fig. 14 is a cross-sectional view of a horizontal rib of a retard-bonded prestressed tendon according to a seventh embodiment of the present invention;

FIG. 15 is a cross-sectional view of a seventh embodiment of the present invention, illustrating a non-transverse rib of a pre-stressed tendon bonded thereto;

fig. 16 is a cross-sectional view of a retard-bonded prestressed tendon according to an eighth embodiment of the present invention;

fig. 17 is a cross-sectional view of a non-transverse rib of a retard-bonded prestressed tendon according to an eighth embodiment of the present invention;

FIG. 18 is a schematic view of an embodiment of the construction method of the middle-slow bonding prestressed tendon of the present invention;

FIG. 19 is a view taken along line D of FIG. 18;

FIG. 20 is a cross-sectional view taken along line C-C of FIG. 18;

fig. 21 is a schematic view of an embodiment of the construction method of the slow adhesion prestressed tendon according to the present invention.

Description of reference numerals:

100. bonding the prestressed tendons in a buffering manner; 10. Prestressed tendons;

20. a protective sleeve; 21. A cross rib;

22. longitudinal ribs; 30. A set retarding binder;

200. a tension end anchorage; 210. A tensioning end sealing cap;

220. a tensioning end anchor backing plate member; 230. Tensioning the end anchor plate;

240. a clip; 250. Stretching the rib spiral rib;

300. a fixed end anchorage device; 310. A fixed end anchor plate;

320. extruding the anchor; 330. A fixed end anchor backing plate component;

340. a fixed end sealing cap; 350. The fixed end is provided with a spiral rib.

Detailed Description

The details of the present invention can be more clearly understood with reference to the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of explanation only, and should not be construed as limiting the invention in any way. Given the teachings of the present invention, the skilled person can conceive of any possible variants based on the invention, which should all be considered as belonging to the scope of the invention.

As shown in fig. 1 to 17, the present invention provides a slow bonding prestressed tendon 100, which includes: the concrete reinforcing structure comprises two or more prestressed tendons 10, a protective sleeve 20 and a slow setting adhesive 30, wherein the two or more prestressed tendons 10 are arranged in parallel to form a tendon, the protective sleeve 20 is sleeved outside the tendon, and the slow setting adhesive 30 is filled between the tendon and the protective sleeve 20 to form a filling layer.

The utility model provides a slow bonding prestressing tendons restraints 100 is provided with many prestressing tendons 10 in the protective sheath 20, only through a slow bonding prestressing tendons restraints 100 can realize the crowd and draw the crowd anchor, has overcome slow bonding prestressing tendons and has singly arranged single stretch-draw, shortcoming that the efficiency of construction is not high.

The utility model provides a retard and bond prestressing tendons 100, many prestressing tendons 10 concentrate and arrange into the tendons, and slow setting adhesive 30 is filled between tendons and protective sheath 20, compares the form of arranging of the single prestressing tendons of the slow bonding of same radical in prior art, obviously can save the use amount of the material of slow setting adhesive 30 and protective sheath 20 to can practice thrift raw and other materials, reduction in production cost.

The utility model provides a slow bonding prestressing tendons restraints 100, after arranging many prestressing tendons 10 into the muscle bundle in a concentrated way earlier, the cover is equipped with protective sheath 20 again, and the maximum diameter of its outline is obviously less than many slow bonding single prestressing tendons and ties up the outline maximum diameter of beam forming, can arrange in littleer space, can reduce the curved rise of prestressing force cloth muscle simultaneously, provides bigger effective prestressing force to practice thrift the prestressed steel quantity.

In the utility model, the retarding adhesive 30 is an epoxy cementing material which is solidified according to the expected time, is paste before solidification and has certain fluidity and thixotropy, and the prestressed tendons can freely slide in the sheath under the action of tensile force; the delayed coagulation adhesive 30 can bond the prestressed tendon and the protective sleeve 20 into a whole after being cured, the hardness can reach more than 80D after being cured, and the tensile shear strength can reach more than 10 MPa.

In an alternative embodiment of the present invention, the slow adhesion tendon 100 comprises 2 to 7 tendons 10.

In an alternative example of this embodiment, as shown in fig. 2 and fig. 3, fig. 2 isbase:Sub>A cross-sectional view ofbase:Sub>A horizontal rib ofbase:Sub>A slow adhesion pre-stressing tendon according to an embodiment of the present invention (i.e.,base:Sub>A cross-sectional view taken alongbase:Sub>A-base:Sub>A in fig. 1); fig. 3 is a cross-sectional view of a non-transverse rib of a retard-bonded prestressed tendon according to an embodiment of the present invention (i.e., a cross-sectional view taken along line B-B in fig. 1); the slow bonding prestressed tendon 100 comprises 2 prestressed tendons 10, wherein the 2 prestressed tendons 10 are arranged in parallel and abut against each other.

In another optional example of this embodiment, as shown in fig. 4 and 5, the slow adhesion prestressed tendon bundle 100 includes 3 prestressed tendons 10,3 prestressed tendons 10 are disposed in parallel and abutted against each other, and the 3 prestressed tendons 10 are arranged in a triangle, that is, the 3 prestressed tendons 10 are respectively located at the positions of three vertices of the triangle.

In yet another alternative example of this embodiment, as shown in fig. 6 and 7, the slow bonded tendon 100 includes 4 tendons 10,4 tendons 10 are arranged in parallel, and every 3 tendons 10 abut against each other.

In an alternative example, the 4 tendons 10 are arranged in a quadrilateral, i.e. the 4 tendons 10 are located at the positions of four vertices of the quadrilateral respectively.

In a fourth alternative example of this embodiment, as shown in fig. 8 and 9, the slow bonded tendon 100 includes 5 tendons 10,5 tendons 10 arranged in parallel and 3 adjacent tendons 10 abutting against each other.

Further, 5 tendons 10 are arranged in two rows, with 3 tendons 10 in one row and 2 tendons 10 in the other row.

In a fifth alternative example of this embodiment, as shown in fig. 10 and 11, the slow bonded tendon 100 includes 6 tendons 10,6 tendons 10 arranged in parallel and 3 tendons 10 adjacent to each other abutting against each other.

In an alternative example, 6 tendons 10 are arranged in two rows of 3 tendons 10 in each row.

In a sixth alternative example of this embodiment, as shown in fig. 12 and 13, the slow bonded tendon 100 includes 7 tendons 10,7 tendons 10 arranged in parallel and 3 adjacent tendons 10 abutting against each other.

In an alternative example, 1 tendon 10 is provided at the central position, and the remaining 6 tendons 10 are uniformly distributed along the circumferential direction of the central position.

In an alternative embodiment of the present invention, each tendon 10 is a prestressed strand or a prestressed wire.

In an alternative example of this embodiment, as shown in fig. 14 and 15, each tendon 10 is a 1 × 19S prestressed strand.

In another alternative example of this embodiment, as shown in fig. 16 and 17, each tendon 10 is a 1 × 19W prestressed strand.

In an alternative embodiment of the present invention, the protective sheath 20 is a high density polyethylene protective sheath.

The utility model discloses an in the optional embodiment, be equipped with many cross ribs 21 of evagination on the outer wall of protective sheath 20, cross rib 21 sets up along protective sheath 20's circumferencial direction, many cross ribs 21 order interval arrangement in order to form unsmooth configuration, this unsmooth configuration can closely "interlock" with the concrete to form the strong effect of slow bonding prestressing tendons 100 and concrete, lasting interlock, the effect of inlaying solid, realize slow bonding prestressing tendons 100 overall length and the common atress of concrete.

Wherein the height difference between the convex part structure (i.e. the top of the transverse rib 21) and the transverse rib concave part structure (i.e. the bottom of the recess between two adjacent transverse ribs 21) of the concave-convex structure is the rib height.

In an alternative embodiment of the present invention, two or more longitudinal ribs 22 protruding outward are provided on the outer wall of the protective sheath 20, and the longitudinal ribs 22 are disposed along the length direction of the protective sheath 20. The longitudinal ribs 22 are the press-formed structure of both the protective sleeve 20 and the transverse ribs 21.

In an alternative example of this embodiment, the protective sheath 20 is provided with two longitudinal ribs 22, and the two longitudinal ribs 22 are symmetrically arranged on two sides of the protective sheath 20.

The utility model provides a retard bonding prestressing tendons restraints 100 when manufacturing, earlier through equipment with many prestressing tendons 10 according to certain regular arrangement one-tenth muscle restraints (prestressing tendons restraints), rethread retarding adhesive coating equipment is at this prestressing tendons restraint external coating a certain amount of retarding adhesive 30, wrap up the annular high density polyethylene sheath that hot extrusion extruded immediately outside retarding adhesive 30, then it presses to get into rib shape suppression equipment and presses the protective sheath 20 that has unsmooth structure interval arrangement's horizontal rib 21 and vertical rib 22 to constitute, protective sheath 20 still is in the high temperature state this moment, the setting after the water-cooling. Finally, the slow bonding prestressed tendon 100 is coiled into a coil by equipment, so that the packaging, transportation and storage are convenient.

Fig. 2 to 13 show examples of the slow bonded prestressed tendons corresponding to tendons (prestressed tendons) consisting of 2 to 7 prestressed steel strands, and the manufacturing scheme of the slow bonded prestressed tendon 100 corresponding to the prestressed tendon consisting of more prestressed tendons 10 is similar to the above-mentioned scheme, which is not listed here.

The utility model also provides a slow bonding prestressing tendons's stretch-draw end ground tackle 200, install the one end at slow bonding prestressing tendons, it includes the sealed cap of stretch-draw end 210 that the order is connected, stretch-draw end anchor backing plate component 220 and stretch-draw end anchor slab 230, stretch-draw end anchor backing plate component 220 has the inner chamber that the axial link up, set up the slip casting passageway that links to each other with this inner chamber on the outer wall of stretch-draw end anchor backing plate component 220, the sealed cap of stretch-draw end 210 lid is established in the one end of this stretch-draw end anchor backing plate component 220 and is sealed this tip, the other end butt of stretch-draw end anchor backing plate component 220 is on a face of stretch-draw end anchor slab 230, set up the anchor through-hole more than two or two on the stretch-draw end anchor slab 230, each anchor through-hole and each prestressing tendons 10 one-to-corresponding setting, slow bonding prestressing tendons 100 runs through the sealed cap of stretch-draw end 210 and the inner chamber of stretch-draw end anchor backing plate component 220 in proper order, each prestressing tendons 10 of slow bonding prestressing tendons 100 corresponds the clamping piece and is equipped with the fixed prestressing tendons's that is used for the one end 100 and is penetrated the sealed clamping piece 240, the sealed tendon that the anchor that the slow bonding prestressing tendons is strung in proper order, the one end 100 that the anchor through the stress that the anchor that bonds.

In the present invention, as shown in fig. 18, the tension end sealing cap 210 and the tension end anchor plate 230 are respectively located at both ends of the tension end anchor backing plate member 220, and seal both ends of the inner cavity of the tension end anchor backing plate member 220. When the delayed coagulation adhesive is required to be injected into the inner cavity of the anchor backing plate member 220 at the tensioning end, the delayed coagulation adhesive is injected into the inner cavity through the grouting channel, and then the grouting channel is closed, so that the delayed coagulation adhesive is prevented from leaking outside. After the set retarding adhesive is solidified, the set retarding prestressed tendons 100 and the tension end anchorage 200 can be more firmly connected together.

In an alternative embodiment of the present invention, the tension end anchor backing plate member 220 is further sleeved with a tension end spiral rib 250.

The utility model discloses still provide a stiff end ground tackle 300 of slowly bonding prestressing tendons restrainting, install the other end at slowly bonding prestressing tendons restrainting, it includes stiff end anchor slab 310 and two or two above extrusion anchors 320 at least, set up the anchor through-hole more than two or two on the stiff end anchor slab 310, each extrusion anchor 320, each anchor through-hole and each prestressing tendons 10 one-to-one setting, each prestressing tendons 10 correspond run through the anchor through-hole and with extrusion anchor 320 fixed connection, each prestressing tendons 10 of the other end of slowly bonding prestressing tendons restrainting 100 corresponds run through the anchor through-hole and is fixed by extrusion anchor 320.

In an optional embodiment of the present invention, as shown in fig. 21, the fixed end anchor 300 further comprises a fixed end anchor backing member 330 and a fixed end sealing cap 340, one end of the fixed end anchor backing member 330 abuts against the surface of the fixed end anchor plate 310, which faces away from the extrusion anchor 320, the fixed end anchor backing member 330 has an inner cavity through axially, a grouting channel connected with the inner cavity is provided on the outer wall of the fixed end anchor backing member 330, the fixed end sealing cap 340 covers the other end of the fixed end anchor backing member 330 and seals the end portion, and the slow adhesion prestress tendon 100 sequentially runs through the fixed end sealing cap 340 and the fixed end anchor backing member 330. The fixed end anchor backing member 330, the fixed end seal cap 340 and the tensioning end anchor backing member 220, the tensioning end seal cap 210 are similar in structure and function and will not be described in detail herein.

In an alternative example of this embodiment, the fixed end anchor pad member 330 is also externally sleeved with a fixed end helical rib 350.

The utility model provides a stretch-draw end ground tackle 200 and stiff end ground tackle 300 has seted up the anchor through-hole on its stretch-draw end anchor slab 230, the stiff end anchor slab 310 respectively, and each prestressing tendons 10 both ends in the prestressing tendons that slowly bond 100 correspond the setting with each anchor through-hole respectively, and the both ends of each prestressing tendons 10 correspond respectively and run through the anchor through-hole, and then realize that the crowd of each prestressing tendons 10 draws the crowd anchor in the prestressing tendons that slowly bonds 100.

The utility model discloses still provide a construction method of slow bonding prestressing tendons restrainting, as shown in fig. 18 to fig. 21, a stretch-draw construction for above-mentioned slow bonding prestressing tendons restrainting 100, the slow bonding prestressing tendons restrainting 100 of intercepting predetermined length, and install stiff end anchor 300 and stretch-draw end anchor 200 respectively at the both ends of this slow bonding prestressing tendons restrainting 100, each prestressing tendons 10 in the slow bonding prestressing tendons restrainting 100 respectively with stiff end anchor 300 and stretch-draw end anchor 200 fixed connection, locate predetermined fixed position and concreting with stiff end anchor 300, treat to stretch-draw this slow bonding prestressing tendons 100 after the concrete sets up, stretch-draw end anchor 200 stretch-draw to predetermined stretch-draw position and seal the anchor to stretch-draw end anchor 200, at the anchor sealing in-process, pour into delayed setting adhesive and shutoff filling opening in the stretch-draw end anchor backing plate component 220 earlier, concreting in order to seal the anchor to stretch-draw end anchor 200 again.

The utility model provides a construction method of slowly bonding prestressing force muscle bundle fills delayed coagulation adhesive and shutoff filling opening in the inner chamber of stretching end anchor backing plate component 220 earlier at the anchor sealing in-process, and the delayed coagulation adhesive solidifies the back, pours the concrete again in order to seal the anchor to stretching end ground tackle 200. The slow-setting adhesive 30 can bond the slow-bonding prestressed tendon 100 and the tensioning-end anchor backing plate member 220 into a whole after curing, the hardness can reach more than 80D after curing, and the tensile shear strength can reach more than 10MPa so as to further strengthen the connection firmness degree of the slow-bonding prestressed tendon 100 and the tensioning-end anchor 200.

In an alternative embodiment of the present invention, the construction of the slow adhesion prestressed tendon 100 includes the following steps: blanking, bar penetrating, concrete pouring, tensioning and anchor sealing. Wherein, the blanking step mainly comprises the steps of cutting off fixed-length and fixed-end manufacture of the slow bonding prestressed tendon 100 (one end of the slow bonding prestressed tendon 100, which is provided with the fixed-end anchorage device 300, is a fixed end, and the other end of the slow bonding prestressed tendon 100, which is provided with the tensile-end anchorage device 200, is a tensile end), and the reinforcement penetrating step mainly comprises the steps of arranging reinforcement and positioning the slow bonding prestressed tendon 100 and installing the tensile-end anchorage plate 230.

In an alternative example of this embodiment, the complete set of fixed end anchors 300 is assembled with the slow bonded pre-stressed tendons 100 at the blanking stage; the tension end anchorage 200 is completely installed prior to concrete placement, except for the clamping tabs 240 and the tension end anchorage plates 230.

In an alternative example of this embodiment, in the tensioning step, before tensioning, the protective sleeve 20 for slowly bonding the tensioning ends of the tendons needs to be stripped off and the delayed coagulation adhesive outside the tendons 10 needs to be cleaned, so that the tendons 10 at the tensioning ends are separated from each other and exposed, and then the tendons 10 correspondingly penetrate through the anchoring through holes, and the tensioning end anchor plate 230 and the clamping pieces 240 are installed. By adopting the steps, the installation of each prestressed tendon 10, the tensioning end anchor plate 230 and the clamping piece 240 is facilitated, and each prestressed tendon 10 can be directly contacted with the delayed coagulation adhesive, so that the adhesive strength of the delayed coagulation adhesive is further improved.

In an alternative example of this embodiment, in the step of sealing the anchor, grouting material is poured into the cavity of the tension end anchor backing member 220 and the grouting opening is closed, and then the anchor sealing is performed.

In an alternative example of this embodiment, after the protective sleeve 20 is peeled off from the fixed end of the slow adhesion tendon 100 during the concrete pouring, each tendon 10 is directly poured into the concrete, and the cavity of the anchor backing member 220 at the tensioning end is poured with grouting material during the anchor sealing stage. The construction process is suitable for the working condition with low requirement on corrosion resistance.

In another optional example of this embodiment, under the working conditions with strict corrosion protection requirements, the fixed-end anchorage device 300 further comprises a fixed-end anchorage plate member 330 and a fixed-end sealing cap 340, wherein the cavity of the fixed-end anchorage plate member 330 should be filled with a special retarding adhesive for anchor sealing before concrete pouring, and then the grouting opening should be sealed, and the exposed surfaces of the fixed-end anchorage plate 310 and the extrusion anchor 320 should be coated with epoxy resin for corrosion protection; the cavity of the tensioning end anchor backing plate member 220 is filled with a special delayed coagulation adhesive for anchor sealing at the anchor sealing stage after tensioning is completed, then a grouting opening is sealed, the exposed surfaces of the tensioning end anchor plate 230 and the clamping pieces 240 are coated with epoxy resin for corrosion prevention, and finally the anchor is sealed by micro-expansion concrete.

Now, an embodiment of the present invention is combined to describe in detail the present invention provides a concrete construction process of the slow adhesion pre-stressed tendon 100, the fixed end anchorage 300, the tension end anchorage 200 and the construction method:

in this embodiment, a concrete implementation of the construction process of the slow bonded prestressed tendon is exemplified by a slow bonded prestressed tendon 100 composed of 7 prestressed steel strands.

The concrete construction steps of the retarded adhesive prestressed tendon 100 are as follows: blanking (cutting to length and manufacturing a fixed end), reinforcing steel bar penetrating (reinforcing steel bar distribution positioning, installation of an anchor backing plate component 220 at a tensioning end), concrete pouring, tensioning and anchor sealing. The connection mode of the fixed end anchorage device 300, the tensioning end anchorage device 200 and the slow bonding prestressed tendon 100 is that the fixed end anchorage device 300 and the slow bonding prestressed tendon 100 are assembled at the discharging stage; the tension end anchorage device 200 is completely installed before concrete pouring except for the clamping pieces 240 and the tension end anchor plates 230; in the tensioning stage, before tensioning, the retarded adhesive prestressed tendon protection sleeve 20 at the tensioning end needs to be stripped, the adhesive (retarded adhesive) on the prestressed tendon 10 needs to be cleaned, and then the tensioning end anchor plate 230 and the clamping piece 240 need to be installed; in the anchor sealing stage, grouting material (delayed coagulation adhesive) is poured into the cavity of the anchor backing plate member 220 at the tensioning end, the grouting opening is sealed, and then the anchor sealing is carried out.

In the following description of the embodiments, the description is not intended to limit the invention for any reason, and in particular, the features described in the different embodiments may be combined with each other as desired, so as to form other embodiments, which are not limited to the embodiments described, except for the explicit contrary.

Claims (9)

1. A slow bonded pre-stressed tendon comprising:

two or more prestressed tendons which are arranged in parallel and form a tendon;

the protective sleeve is sleeved outside the tendon;

and the delayed coagulation adhesive is filled between the tendon and the protective sleeve to form a filling layer.

2. The slow bonded prestressed tendon as claimed in claim 1, wherein said slow bonded prestressed tendon comprises two or more of said prestressed tendons.

3. The slow bonded prestressed reinforcement bundle of claim 1, wherein said prestressed reinforcement is a prestressed strand or a prestressed wire.

4. The slow bonded prestressed tendon as claimed in claim 1, wherein said protective sheath is a high density polyethylene protective sheath.

5. The slow-adhesion prestressed tendon as claimed in claim 1, wherein the outer wall of the protective sheath has a plurality of convex cross ribs, each of the cross ribs is disposed along the circumferential direction of the protective sheath, and the plurality of cross ribs are sequentially arranged at intervals.

6. The slow-adhesion prestressed tendon as claimed in claim 1, wherein the protective sheath has at least one longitudinal rib protruding outward from the outer wall thereof, and the longitudinal rib is disposed along the length of the protective sheath.

7. A tensioning end anchorage device of a slow bonding prestressed tendon bundle for tensioning the slow bonding prestressed tendon bundle as claimed in any one of claims 1 to 6, characterized in that the tensioning end anchorage device comprises a tensioning end sealing cap, a tensioning end anchor backing plate component and a tensioning end anchor plate, the tensioning end anchor backing plate component is provided with an inner cavity which is axially communicated, the outer wall of the tensioning end anchor backing plate component is provided with a grouting channel which is connected with the inner cavity, the tensioning end sealing cap and the tensioning end anchor backing plate component are respectively positioned at two ends of the tensioning end anchor backing plate component and seal the inner cavity, the tensioning end anchor plate is provided with two or more than two anchoring through holes, each anchoring through hole is arranged corresponding to each prestressed tendon one by one, a clamping piece for clamping the prestressed tendon is arranged in each anchoring through hole, one end of the slow bonding prestressed tendon bundle sequentially penetrates through the tensioning end sealing cap and the inner cavity, and each prestressed tendon of the slow bonding prestressed tendon bundle correspondingly penetrates through hole and is fixed by the clamping piece.

8. A fixed-end anchorage of a slow-bonding prestressed tendon for fixing the slow-bonding prestressed tendon as claimed in any one of claims 1 to 6, wherein the fixed-end anchorage comprises a fixed-end anchorage plate and two or more than two extrusion anchorage bodies, the fixed-end anchorage plate is provided with two or more than two anchoring through holes, each extrusion anchorage body and each anchoring through hole are respectively arranged corresponding to each prestressed tendon, each prestressed tendon correspondingly penetrates through the anchoring through hole and is fixedly connected with the extrusion anchorage body, and each prestressed tendon at the other end of the slow-bonding prestressed tendon correspondingly penetrates through the anchoring through hole and is fixed by the extrusion anchorage body.

9. The anchor of claim 8, further comprising a fixed end anchor backing member and a fixed end sealing cap, wherein one end of the fixed end anchor backing member abuts against a surface of the fixed end anchor plate facing away from the extruded anchor body, the fixed end anchor backing member has an axially through cavity, a grouting channel connected to the cavity is formed in an outer wall of the fixed end anchor backing member, and the fixed end sealing cap is disposed on the other end of the fixed end anchor backing member and seals the end.

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