CN212896335U

CN212896335U - Three-section type prestressed anchor rod with excellent durability and reinforcing structure

Info

Publication number: CN212896335U
Application number: CN202021356705.4U
Authority: CN
Inventors: 龙再明
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2021-04-06
Anticipated expiration: 2030-07-10

Abstract

The utility model provides a syllogic prestressed anchorage pole that durability is good, this syllogic prestressed anchorage pole is including the first anchor section of arranging in proper order, free section and second anchor section, first anchor section and second anchor section are located the both ends of this syllogic prestressed anchorage pole respectively, the centre is the free section, first anchor section is the slow bonding steel strand wires muscle body that does not have isolation sleeve, be used for passing in proper order and stretch-draw end ground tackle, pedestal or waist rail, and reinforced structure, be the free section behind the first anchor section, the free section comprises the slow bonding steel strand wires muscle body and isolation sleeve, the second anchor section is the slow bonding steel strand wires muscle body that does not have isolation sleeve, be used for the carrier of joint bar body. The utility model discloses a prestressed anchorage pole of syllogic structure, stock durability increases substantially, can ensure even stretch-draw end ground tackle clamping piece rusts inefficacy or second anchor section supporting body inefficacy, the stock can not become invalid yet.

Description

Three-section type prestressed anchor rod with excellent durability and reinforcing structure

Technical Field

The utility model belongs to the technical field of building engineering prestressed anchorage pole, concretely relates to syllogic prestressed anchorage pole that durability is good.

Background

The anchor rod is a member for supporting and reinforcing rock mass, soil mass and existing buildings, and comprises a non-prestressed anchor rod and a prestressed anchor rod. The non-prestressed anchor rod is passively stressed, under the design load, the anchor rod grouting slurry is inevitably cracked, the durability is poor, and the non-prestressed anchor rod grouting slurry is generally only used in some temporary projects with low stress and unimportant general projects; the prestressed anchor rod can be divided into a tension anchor rod and a pressure anchor rod, the prestressed anchor rod is superior to a non-prestressed anchor rod in durability because the anchor rod is prestressed before the anchor rod is stressed, according to the technical specification of geotechnical anchor rod and shotcrete support engineering (GB50086-2015) of the national standard, both the tension prestressed anchor rod and the pressure prestressed anchor rod are in two sections, namely a free section and an anchoring section, the free section is arranged between the anchoring section of the rod body and an anchorage device at a tensioning end (usually about 5-6 m), a prestressed rib body is completely isolated from grouting body at the tensioning end, a waist beam, a pedestal and protected structural concrete in the free section of the prestressed anchor rod rib body, the prestressed rib body can freely slide in the free section, and once the anchorage device at the tensioning end is not well protected, an anchorage device at the tensioning end is easy to rust in a high stress state, the clamping piece can not clamp the prestressed steel strand after rusting, in addition, the slurry of the anchoring section of the tension type anchor rod (with the bonded prestressed rib anchor rod) is pulled to crack so as to cause the corrosion of the steel strand, the pressure type anchor rod (without the bonded prestressed rib anchor rod) can have the corrosion of the supporting body of the anchoring section, and the whole anchor rod can completely fail as long as one end fails.

At present, the prestressed anchor rod is very common to be used in temporary support engineering to serve as a temporary support anchor rod, but people worry about the durability problem, the use of the prestressed anchor rod in permanent engineering is not too common, and if the durability problem of the prestressed anchor rod can be solved, the prestressed anchor rod in permanent engineering can be widely applied.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can effectively improve the prestressed anchorage pole of durability, fastness to the shortcoming of current prestressed anchorage pole.

In order to realize the above object, the utility model provides a syllogic prestressed anchorage pole that durability is good, this syllogic prestressed anchorage pole is including the first anchor section of arranging in proper order, free segment and second anchor section, first anchor section and second anchor section are located the both ends of this syllogic prestressed anchorage pole respectively, the centre is the free segment, first anchor section is the slow bonding steel strand wires muscle body that does not have isolation sleeve, be used for passing in proper order and draw end ground tackle, pedestal or waist rail, and reinforced structure, the free segment comprises the slow bonding steel strand wires muscle body and isolation sleeve, the second anchor section is the slow bonding steel strand wires muscle body that does not have isolation sleeve, be used for connecting muscle body supporting body.

The utility model also provides a reinforcement structure for rock mass or soil body or concrete structure, it is including stretch-draw end ground tackle, pedestal or waist rail, reinforced structure, muscle body supporting body, drilling, by the rock mass or the soil body or the concrete structure of reinforcement protection and syllogic prestressed anchorage pole, drilling is located in the rock mass or the soil body or the concrete structure of reinforcement protection, its characterized in that: the three-section prestressed anchor rod comprises a first anchoring section, a free section and a second anchoring section which are sequentially arranged, wherein the first anchoring section and the second anchoring section are respectively positioned at two ends of the three-section prestressed anchor rod, the free section is arranged in the middle of the three-section prestressed anchor rod, the first anchoring section is a slow bonding steel strand rib body without an isolation sleeve and sequentially penetrates through the tensioning end anchorage device, the pedestal or the waist beam and the reinforcing structure, the free section is composed of the slow bonding steel strand rib body and the isolation sleeve, the second anchoring section is a slow bonding steel strand rib body without the isolation sleeve, cement slurry is poured around the slow bonding steel strand rib body of the second anchoring section, and the second anchoring section is connected with the rib body bearing body.

According to the utility model discloses a reinforced structure for rock mass or soil body or concrete structure, preferably, the isolation sleeve pipe of free section has grout cement paste in addition.

According to the utility model discloses a reinforced structure for rock mass or soil body or concrete structure, preferably, the isolation sleeve pipe partly stretches into in the reinforced structure of free section. More preferably, the portion of the free section of the insulating sleeve projecting into the reinforcing structure has a length equal to or greater than three times the diameter of the insulating sleeve.

According to the utility model discloses a reinforcement structure for rock mass or soil body or concrete structure, preferably, the pedestal with be equipped with the anchor backing plate between the ground tackle.

The utility model discloses a prestressed anchorage pole of syllogic structure, change the free section of original prestressed reinforcement body in waist rail or pedestal and supporting construction into the anchor section, remain middle 5 ~ 6 meters free section, also remain terminal anchor section simultaneously, in first section anchor section with prestressed anchorage pole retard bond steel strand wires muscle body complete with pedestal or waist rail and protected reinforced structure concrete complete contact, steel strand wires can the free slip when stretch-draw in the stretch-draw application period, link into whole with protected reinforced structure concrete after the retard bond steel strand wires complete cure, even ensure that stretch-draw end ground tackle clamping piece rusts inefficacy, the stock can not become invalid yet. For the second anchoring section, the prestressed steel strand can freely slide during tensioning in the tensioning application period, the stress of the anchor rod at the moment is the same as that of an unbonded pressure type anchor rod, after the slow bonding steel strand is solidified, the slow bonding steel strand and the grouting slurry of the second anchoring section are connected into a whole, the bearing body of the second anchoring end cannot generate stress increment at the moment, even if the bearing body connected with the second anchoring section fails, the anchor rod cannot fail, the durability of the anchor rod of the structure is greatly improved, one more safety is provided for the tensioning end and the fixed end, the durability of the three-section type prestressed anchor rod has double safety, and the three-section type prestressed anchor rod can be applied to important permanent engineering, such as foundation stability anchoring of a concrete dam, stability reinforcing of a dangerous mountain, cavern reinforcing of national defense engineering, basement bottom plate anti-floating bridge pier of important engineering, and stable anchoring of guy cables at two ends of a suspension bridge, And (5) anchoring the foundation stability of the large tower type starter in the port.

Drawings

Fig. 1 is a schematic structural view of a two-segment prestressed anchor in the prior art.

Fig. 2 is according to the utility model discloses a syllogic prestressed anchorage pole is at mountain slope support reinforcement, cavern reinforcement, suspension bridge side span cable pier stable reinforcement in the schematic diagram of arranging in using.

Fig. 3 is a schematic layout of a three-segment prestressed anchor rod in a floating-resisting basement floor or a pile foundation uplift application according to the present invention.

Detailed Description

To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

It is noted that some conventional technical operation steps and apparatuses are not described in detail in the following examples for the sake of brevity and clarity, but it is understood that the conventional technical operation steps and apparatuses will be obvious to those skilled in the art if not specifically stated.

Fig. 1 is a schematic structural view of a two-segment prestressed anchor rod in the prior art. The existing two-section prestressed anchor comprises an anchoring section 107 and a free section 106, wherein the free section 106 consists of a rib body 1, an outer-wrapped isolation sleeve 11 and grouting slurry. The two-section type pre-stressed anchor rod is arranged in the drill hole 8, and the full-length pore channel is grouted.

As shown in fig. 2, it is the utility model discloses a good syllogic prestressed anchorage pole of durability is in mountain slope support reinforcement, hole room reinforcement, the arrangement sketch map in suspension bridge sidespan cable pier stabilization reinforcement is used. Fig. 3 is a schematic layout of a three-segment prestressed anchor rod in a floating-resisting basement floor or a pile foundation uplift application according to the present invention.

The utility model discloses a good durability's syllogic prestressed anchorage pole includes first anchor section 72, free section 6 and second anchor section 71 that arrange in proper order from the anchor end to the stretch-draw end, first anchor section 72 and second anchor section 71 are located the both ends of this syllogic prestressed anchorage pole respectively, the middle is free section 6, first anchor section 72 is the slow bonding steel strand wires muscle body 1 that does not have the isolation sleeve, it passes stretch-draw end ground tackle 2, stretch-draw pedestal or waist rail 4 and protected reinforced structure 5, free section 6 is followed to first anchor section 72, free section 6 comprises slow bonding steel strand wires muscle body 1 and isolation sleeve 11, isolation sleeve 11 periphery has cement grout slurry, second anchor section 71 is followed to free section 6, this second anchor section 71 is located the last section of syllogic prestressed anchorage pole, for the slow bonding steel strand wires muscle body 1 that does not have the isolation sleeve, its periphery is poured cement grout, and is connected to the carrier 9.

The utility model discloses a reinforcement structure for rock mass or soil body or concrete structure is including stretch-draw end ground tackle 2, pedestal or waist rail 4, reinforced structure 5 of being protected, drilling 8, rock mass or soil body or concrete structure 10, and syllogic prestressed anchorage pole, drilling 8 is arranged in rock mass or soil body or concrete structure 10, syllogic prestressed anchorage pole includes the first anchor section 72 of arranging in proper order from the anchor end to the stretch-draw end, free section 6 and second anchor section 71, first anchor section 72 and second anchor section 71 are located the both ends of this syllogic prestressed anchorage pole respectively, the centre is free section 6, first anchor section 72 is for not having isolation sleeve's the steel strand wires muscle body 1 that slowly bonds, pass stretch-draw end ground tackle 2 in proper order, pedestal or waist rail 4, and reinforced structure 5 of being protected. Before the retarded adhesive steel strand is cured, in the tensioning working period, the retarded adhesive steel strand can freely slide in the concrete of the tensioning end pedestal or the waist beam 4 and the protected reinforcing structure 5 during tensioning, the retarded adhesive steel strand is completely meshed and connected with the tensioning end pedestal or the waist beam 4 and the protected reinforcing structure 5 into a whole after tensioning is finished and cured, the clamping piece of the tensioning end anchorage device 2 in the later loading process of the protected reinforcing structure 5 basically cannot increase the stress, and even if the clamping piece of the tensioning end anchorage device 2 is completely failed, the anchor rod is stressed as usual and cannot fail. The first anchoring section 72 is followed by a free section 6, the free section 6 is composed of a slow-bonding steel strand reinforcement body 1 and an isolation sleeve 11, and cement slurry is preferably poured into a gap between the outside of the isolation sleeve 11 and a borehole.

The free section 6 is followed by a second anchoring section 71, and the second anchoring section 71 is a slow-bonding steel strand reinforcement body 1 without an isolation sleeve, is connected with a bearing body 9 at the bottom of the borehole 8, and is filled with cement slurry around the slow-bonding steel strand reinforcement body. During stretch-draw in the stretch-draw life, slowly bond steel strand wires muscle body 1 can freely slide in second anchor section 71, lean on the tip supporting body to pass power, stretch-draw accomplishes the solidification back, slowly bond steel strand wires and second anchor section 71's complete interlock of cement grout slurry and become an organic whole, later its terminal supporting body 9 of the loaded in-process of bearing a load can not produce stress increment basically, even the supporting body 9 of tip became invalid, the stock can not become invalid yet, the durability improves by a wide margin, consequently the utility model discloses a syllogic anchor structure has the dual fail-safe effect.

Preferably, a portion of the insulation sleeve 11 of the free section 6 protrudes into the supporting structure 5. More preferably, the portion of the free section 6 in which the insulating sleeve 11 protrudes inside the reinforcing structure 5 to be protected has a length equal to or greater than three times the diameter of the insulating sleeve 11.

The reinforcing structure 5 to be protected and the bed or wale 4 are cast of concrete.

Preferably, an anchor backing plate 3 may be further provided between the platform or wale 4 and the anchor 2.

Preferably, the length of the first anchoring section 72 is at least 1% of the total length of the anchor, the length of the free section 6 is at least 10% of the total length of the anchor, and the length of the second anchoring section 71 is at least 30% of the total length of the anchor.

Preferably, the prestressed reinforcement body 1 is a steel strand, more preferably a slow-bonding steel strand. The tendon body of the prestressed anchor rod is made of the slow-bonding steel strand, is available at present, has mass production in China at present, and can be purchased and obtained through commercial channels. The retarded adhesive steel strand can freely slide in concrete and grout body in a proper tensioning working period, prestressed tensioning locking can be implemented, after the retarded adhesive material is completely cured, the reinforcement body is protected by three layers, the first layer is formed by tightly wrapping the steel strand by high-strength epoxy resin with the thickness of more than 2mm after the steel strand is externally cured, the steel strand is excellent in corrosion resistance, the outermost layer is further wrapped by a high-density polyethylene ribbed outer sleeve with the thickness of more than 1mm, the cured retarded adhesive steel strand is completely engaged with the concrete of the girt or pedestal and the supporting structure, the retarded adhesive steel strand is generally embedded into C40 concrete for more than 500mm, the steel strand cannot be pulled out during damage, and even if the retarded adhesive steel strand is completely engaged with grout body after curing, at the moment, even if the clamping piece of the anchorage device at the tensioning end is rusted and the bearing body of the second anchoring section is rusted and corroded, the anchor rod body is completely engaged with the concrete and the grout body of the supporting structure, the bolt will not fail.

The following is the utility model discloses a syllogic prestressed anchorage pole work progress.

1. Cutting the retarded adhesive steel strand (namely the rib body 1) by a grinder according to the required length of the design for blanking.

2. And assembling a supporting body 9 of the slow bonding steel strand.

3. And arranging the isolation sleeve 11 of the free section 6 of the slowly-bonded steel strand by using a flexible rubber pipe according to the design requirement, wherein the length of the part extending into the concrete of the supporting structure 5 is equal to or more than three times of the diameter of the isolation sleeve 11.

4. The anchor rod positioning and drilling are carried out according to the design requirements, and the holes can be equal-diameter holes or bottom-end enlarged head holes and are cleaned.

5. The whole set is put into the assembled slow bonding prestressed steel strand rod body.

6. And performing primary and secondary grouting on the free section and the second anchoring section of the anchor rod drilling hole.

7. The installation pedestal or the wale 4, the reinforcing bar of the reinforced structure 5 to be protected, the installation tensioning end anchor backing plate 3, the free section 6 (slowly bond the steel strand and wrap the spacer sleeve 11 outward) stretches into a small section of the steel reinforcement cage, and the rest part (from wrapping the spacer sleeve 11 outward to the portion between the tensioning end) of slowly bonding the steel strand exposes completely to after pouring the concrete at the back, slowly bond the steel strand and link into an integrated entity with the concrete after accomplishing the stretch-draw and solidifying, provide sufficient withdrawal resistance.

8. Concrete for the pedestals or wales 4, the reinforcing structure 5 to be protected, is poured.

9. After the concrete of the pedestal or the waist rail 4 and the protected reinforced structure 5 reaches the tension locking strength required by the design, the anchor 2 at the tension end is installed, and the anchor rod is locked and tensioned according to the design requirement.

10. And cutting the redundant slowly-bonded steel stranded wires at the tensioning end by using a grinding machine, wherein the exposed length of the steel stranded wires is not less than 50 mm.

11. And (4) well preparing an anchorage device at the tensioning end for corrosion prevention, sealing the tensioning end by fine stone micro-expansion concrete, and ensuring that the protective layer of the prestressed steel strand is not less than 50 mm.

The utility model discloses a prestressed anchorage pole of syllogic structure, change the free section of the original prestressed reinforcement body in waist rail or pedestal and supporting construction into the anchor section, keep middle 5 ~ 6 meters free section, also keep terminal anchor section simultaneously, in first section anchor section with prestressed anchorage pole slow bonding steel strand wires muscle body complete with waist rail or pedestal and by the concrete full contact of protective structure, the slow bonding steel strand wires muscle body and the grout body of second anchor section also contact completely, even if guarantee to slow bonding steel strand wires complete consolidation back stretch-draw end ground tackle clamping piece rust failure or second anchor section supporting body failure, the stock can not become invalid yet. The anchor rod with the structure has greatly improved durability, plays a role of double insurance, and can be applied to important permanent engineering, such as the stable anchoring of the foundation of a concrete dam, the stable reinforcing of dangerous mountain bodies, the reinforcing of chambers of national defense engineering, the anti-floating of basement bottom plates of important engineering (shown in figure 3), the stable anchoring of cable piers at two ends of a suspension bridge and the stable anchoring of the foundation of a large-scale tower type starter of a harbor.

The above embodiments are merely exemplary and do not set any limit to the scope of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications are intended to be included within the scope of the invention.

Claims

1. A good three-section prestressed anchorage pole of durability which characterized in that: the three-section prestressed anchor rod comprises a first anchoring section, a free section and a second anchoring section which are sequentially arranged, wherein the first anchoring section and the second anchoring section are respectively positioned at two ends of the three-section prestressed anchor rod, the free section is arranged in the middle of the three-section prestressed anchor rod, the first anchoring section is a slowly-bonded steel strand rib body without an isolation sleeve and is used for sequentially passing through a tensioning end anchorage device, a pedestal or a waist beam and a reinforcing structure, the free section is composed of the slowly-bonded steel strand rib body and the isolation sleeve, and the second anchoring section is a slowly-bonded steel strand rib body without the isolation sleeve and is used for connecting a rib body bearing body.

2. A reinforced structure for a rock or soil or concrete structure, comprising a tension end anchorage, a pedestal or a wale, a reinforcing structure, a tendon support, a bore hole, a rock or soil or concrete structure to be reinforced and protected, and a three-section prestressed anchor rod, the bore hole being located in the rock or soil or concrete structure to be reinforced and protected, characterized in that: the three-section prestressed anchor rod comprises a first anchoring section, a free section and a second anchoring section which are sequentially arranged, wherein the first anchoring section and the second anchoring section are respectively positioned at two ends of the three-section prestressed anchor rod, the free section is arranged in the middle of the three-section prestressed anchor rod, the first anchoring section is a slow bonding steel strand rib body without an isolation sleeve and sequentially penetrates through the tensioning end anchorage device, the pedestal or the waist beam and the reinforcing structure, the free section consists of the slow bonding steel strand rib body and the isolation sleeve, the second anchoring section is a slow bonding steel strand rib body without the isolation sleeve, cement slurry is poured around the slow bonding steel strand rib body of the second anchoring section, and the second anchoring section is connected with the rib body bearing body.

3. A reinforcing construction for a rock or soil mass or concrete structure as claimed in claim 2 wherein a grout cement slurry is also provided outside the jacket of the free section.

4. A reinforcing construction for a rock or soil mass or concrete structure according to claim 2 wherein a portion of the free section of the insulating sleeve projects into the reinforcing structure.

5. A reinforcing construction for a rock or soil mass or concrete structure according to claim 3 wherein the portion of the free section of the insulating sleeve which projects into the reinforcing structure has a length equal to or greater than three times the diameter of the insulating sleeve.

6. A reinforcing construction for a rock or soil or concrete structure as claimed in claim 3, wherein an anchor pad is provided between the tension end anchorage and the platform or wale.