CN115355029B - Sleeve type prestress anchorage device suitable for steel strand - Google Patents
Sleeve type prestress anchorage device suitable for steel strand Download PDFInfo
- Publication number
- CN115355029B CN115355029B CN202211106310.2A CN202211106310A CN115355029B CN 115355029 B CN115355029 B CN 115355029B CN 202211106310 A CN202211106310 A CN 202211106310A CN 115355029 B CN115355029 B CN 115355029B
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- Prior art keywords
- sleeve
- ring
- steel strand
- groove
- connector
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 14
- 239000002689 soil Substances 0.000 claims abstract description 13
- 238000004873 anchoring Methods 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 230000000449 premovement Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/008—Anchoring or tensioning means
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a sleeve type prestress anchor device suitable for a steel strand, which comprises a sleeve, a push ring, a groove, a steel strand, a connector barb, a connector, a metal limiting ring, a spring and a clamping ring. The special structure of the sleeve is fully utilized, the buried steel stranded wires needing to be prestressed can be directly anchored, the defect of complex construction of the conventional anchorage is overcome, and the special structure can ensure that the whole anchorage is firmly buried in soil; through the barbs on the connector, the steel strand can only move unidirectionally and axially, and the push ring is added to push the metal limiting ring to enter the groove for three-gear adjustment, so that the steel strand is driven to move, and the effect of prestress self-anchoring is achieved; the invention has the advantages of high construction speed, convenient operation, single-person complete whole-course operation, low construction cost, labor saving, clean construction site and environmental protection.
Description
Technical Field
The invention relates to the field of civil engineering, in particular to the technical field of anchors, and more particularly relates to a sleeve-type prestress anchor device suitable for steel strands.
Background
Along with the development of the infrastructure construction of China, the prestressed anchorage device plays an important role in the fields of municipal engineering, traffic engineering, geotechnical engineering and the like. The prestressed anchorage device is used as an active supporting arm section, can effectively improve the stability and strength of a rock-soil body and change the self-stress state in the rock-soil body, and is widely applied to projects such as side slopes, foundation pits and the like. In recent years, prestressed anchor cables or anchorage devices are successfully applied, and part of scholars are inspired by the timely active support concept and try to apply the prestressed anchor cables or anchorage devices to other underground projects and achieve certain effects, such as a pall tunnel, a Chongguan railway Newcastle tunnel, a Beijing Zhang Gaotie octad great wall station and other projects.
Because the prestressed anchor cable/anchorage support is in a preliminary application stage in the field of highway tunnels in China, no special prestressed anchor member for the highway tunnels exists at present, mining anchorage devices are adopted in construction sites, and the common mining anchorage devices have differences in the aspects of anchor ring cone angle, clip cone angle, anchorage device length, materials and the like, and different anchorage devices can show different anchorage effects. In order to reduce the complexity of conventional prestress anchorage device/anchor cable construction, a sleeve type anchorage device suitable for steel strands is provided, a simple anchoring mode can be provided for an anchor rod needing to be subjected to prestress application, the bearing capacity of the anchor rod can be obviously improved, and a novel technical method can be provided for related fields such as highway tunnel support in China.
Disclosure of Invention
Aiming at the prior requirements, the invention aims to overcome the defect of complex procedures in the construction of common anchorage devices/anchor cables, and combines the structural characteristics of sleeves, and provides a sleeve type prestress anchorage device suitable for steel strands. The invention adopts the following technical scheme:
A sleeve type prestress anchor suitable for a steel strand comprises a sleeve 1, a push ring 2, a groove 3, a steel strand 4, a connector barb 5, a connector 6, a metal limiting ring 7, a spring 8 and a clamping ring 9. The connecting body 6 is arranged in the sleeve 1, the steel strands 4 are inserted into the connecting body 6 and the sleeve 1 from the front end to the rear end in a single direction, the connecting body barbs 5 are arranged at the end positions of the connecting body 6, the push ring 2 is arranged at the middle position of the sleeve 1 and is connected with the connecting body 6 through grooves, the grooves 3 are arranged on the outer surface of the sleeve 1, the metal limiting rings 7 and the springs 8 are arranged inside the pre-opened grooves of the push ring 2, and the clamping rings 9 are arranged inside the push ring 2 and uniformly distributed at four positions along the circumferential direction. When the push ring on the sleeve 1 moves towards the rear end direction, the whole steel strand 4 can be driven to move, and the anchor rod which needs to be anchored can be firmly fixed in the soil body. The invention can provide a new technical method for the anchor rod which needs to be prestressed in the foundation pit support.
The invention can make the steel strand in the anchor rod generate unidirectional pre-axial movement, thereby making the anchor rod generate self-anchoring effect, the push ring 2 consists of two identical semi-rings, wherein two metal snap rings are distributed on the inner side of each semi-ring, the metal snap rings can drive the connecting body 6 to move, and the length of the metal snap rings is about 1/4 times longer than the length of the sleeve.
Further, the barb direction of the connector barb 5 is the pulling-out direction of the steel strand 4 due to the special structure of the connector barb 5. It ensures that the strand 4 moves only in a unidirectional axial direction, similar to an elevator, i.e. an appliance which can move in a unidirectional direction with the rope and can be released from the locked state. The connector barb 5 can be inserted into the steel strand 4 and drives the steel strand 4 to move towards the direction of pulling out the steel strand;
furthermore, the connecting bodies 6 are distributed in a truncated cone shape, and the connecting bodies are used for connecting the push rod 2 and the steel stranded wires 4, so that the contact interface between the connecting bodies 6 and the sleeve 1 is coated with lubricating materials for facilitating anchoring;
Furthermore, the metal limiting ring 7 plays a role of self-anchoring, the inside of the metal limiting ring is connected with the spring 8, when the push rod 2 is pushed to move towards the steel strand pulling direction, the spring 8 is clamped into the groove 3, the groove 3 is formed by three right trapezoid grooves with the same size side by side, the groove depth proposal is 5 mm-8 mm, the metal limiting ring 7 is formed by a metal ring with the same right trapezoid shape in cross section, the size proposal is slightly smaller than the single groove size of the groove 3, namely, when the metal limiting ring 7 moves towards the rear end, the metal limiting ring falls into the groove 3 and can be limited to move towards the front end. Due to the special structures of the groove 3 and the metal limiting ring 7, the pre-movement direction of the steel strand can be regulated only in one direction and can be divided into three gears;
Further, the sleeve 1 is provided with holes in four directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees in the circumferential direction, so that the installation of the metal ring on the push rod 2 is facilitated;
Furthermore, in order to facilitate the installation during construction, the sleeve 1 consists of two identical half sleeves, so that the installation of the connector 6 is facilitated;
further, a reserved groove is reserved on the outer surface of the connecting body 6, so that the snap ring 9 on the push rod 2 is convenient to install and drive to move.
A sleeve-type prestress anchor device suitable for steel strands comprises a sleeve section and a connector section. The diameter of the front end of the sleeve 1 is smaller, the diameter of the rear end of the sleeve 1 is gradually increased along with the increase of the length of the sleeve 1, the sleeve can be smoothly inserted into soil, and the upper sleeve and the lower sleeve can be tightly attached without being connected by other connection modes due to the special structure of the sleeve, so that the whole sleeve is subjected to waterproof and seepage-proof treatment in consideration of the later maintenance cost and period. The depth of the reserved groove on the connector 6 is 40-50 mm, and the width of the reserved groove is slightly larger than the width of the clamping ring 9 on the push ring 2, so that the reserved groove on the connector is ensured to have sufficient bearing capacity, and the thickness of the connector cannot be exceeded. The wall thickness of the sleeve 1 is 10 mm-15 mm, so that the sleeve can bear the extrusion of surrounding soil.
The invention provides a sleeve type prestress anchor device suitable for steel strands, which is characterized in that an anchor rod is divided into three parts for connection through a rubber ring, so that the sleeve type prestress anchor device can be conveniently installed when the anchor rod is constructed, and compared with the prior art, the sleeve type prestress anchor device has the following remarkable characteristics:
1. The special structure of the sleeve is fully utilized, the buried steel stranded wires needing to be prestressed can be directly anchored, the defect of complex construction of the conventional anchorage is overcome, and the special structure can ensure that the whole anchorage is firmly buried in soil.
2. According to the invention, through the barbs on the connector, the steel strand can only move unidirectionally and axially, and the push ring is added to push the metal limiting ring to enter the groove for three-gear adjustment, so that the steel strand is driven to move, and the effect of prestress self-anchoring is achieved.
3. The invention has the advantages of high construction speed, convenient operation, single-person completion of the whole-course operation, low construction cost, labor saving, clean and environment-friendly construction site, and suitability for different engineering geological conditions such as sandy soil layers, viscous soil layers, silt soil layers, pebble layers, miscellaneous fill soil layers and the like.
Drawings
FIG. 1 is a three-dimensional schematic view of a sleeve-type pre-stressed anchor apparatus adapted for use with steel strands;
FIG. 2 is a side detail view of a sleeve-type pre-stressed anchor adapted for use with steel strands;
FIG. 3 is a three-dimensional detail schematic of a sleeve-type pre-stressed anchor apparatus adapted for use with steel strands;
FIG. 4 is a rear three-dimensional schematic view of a sleeve-type pre-stressed anchor apparatus adapted for use with steel strands;
FIG. 5 is a schematic representation of a three-dimensional configuration of a connector in a sleeve-type pre-stressed anchor apparatus adapted for use with steel strands;
FIG. 6 is a schematic representation of a three-dimensional configuration of a push ring in a sleeve-type pre-stressed anchor adapted for use with steel strands;
FIG. 7 is an enlarged schematic view of the pushrod portion of FIG. 2;
Fig. 8 is an enlarged schematic view of the barbed portion of the connector in fig. 2.
Detailed Description
Embodiments of the present invention will be described in detail with reference to fig. 1 to 8.
Fig. 1 shows a three-dimensional schematic of a sleeve-type prestressed anchorage device suitable for use in steel strands. According to the construction sequence and the structural characteristics, the sleeve can be divided into a sleeve section, a connector section and a push ring section. The connection body 6 is located inside the sleeve 1, the sleeve 1 being composed of two identical half-sleeves. In this embodiment, before the steel strand is anchored, the components are required to be assembled, the connecting body 6 is first inserted into the half sleeve, then the upper half sleeve and the lower half sleeve are installed, the installation method is to install from back to front, then the connection part of the sleeve 1 is spliced by bolts, and the connection part of the sleeve 1 is required to be sealed by adopting sealing materials. And then the push ring 2 is arranged on the sleeve 1, the metal snap ring 9 on the push rod 2 is welded with the connector 6, and waterproof and impermeable materials are smeared at the joint to achieve good waterproof effect. And then the assembled integral sleeve is inserted along the steel strand 4 and is propped up to an anchor rod which needs to be anchored, and the two sleeve bodies can be connected by using a rubber ring, so that the anchor rod can be protected. After the above steps are completed, the basic installation is completed. Referring to fig. 7, the push ring 2 is pushed in the rear end direction, so that the metal limiting ring 7 enters the groove 3, and at this time, the connecting body 6 is inserted into the steel strand due to the barbs thereof and drives the steel strand 4 to displace, so that the anchor rod enters a self-anchoring state and has a certain pulling resistance.
Referring to fig. 8, after the steel strand 4 is pulled, the direction of the barb 5 of the connector faces to the rear end, so that the steel strand cannot generate displacement in the front end direction, and the arrangement of a plurality of barbs at the end of the connector can meet the requirement of driving the steel strand to generate displacement.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any simple modification, equivalent variation and modification made to the above embodiment according to the technical matter of the present invention still fall within the scope of the technical scheme of the present invention.
Claims (5)
1. The sleeve type prestress anchorage device suitable for the steel strand is characterized by comprising a sleeve section and a connector section; the diameter of the front end of the sleeve is smaller, and the diameter of the rear end of the sleeve is gradually increased along with the increase of the length of the sleeve, so that the sleeve is smoothly inserted into soil, and the upper sleeve and the lower sleeve are tightly attached; comprises a sleeve, a push ring, a groove, a steel strand, a connector barb, a connector, a metal limiting ring, a spring and a clamping ring; the connecting body is arranged in the sleeve, the steel strands are inserted into the connecting body and the sleeve from the front end to the rear end in a single direction, barbs of the connecting body are arranged at the end parts of the connecting body, the push ring is arranged at the middle part of the sleeve and is connected with the connecting body through a groove, the groove is arranged on the outer surface of the sleeve, the metal limiting ring and the spring are arranged in the pre-opening groove of the push ring, and the clamping ring is arranged in the push ring and uniformly distributed at four positions along the circumferential direction; when the push ring on the sleeve moves towards the rear end, the whole steel strand is driven to move, so that the anchor rod required to be anchored can be firmly fixed in the soil body;
The push ring consists of two identical semi-rings, wherein two metal clamping rings are distributed on the inner side of each semi-ring, and the metal clamping rings can drive the connecting body to move, and the length of the push ring is 1/4 times longer than that of the sleeve;
The barb direction of the connector is the pulling-out direction of the steel strand, the barb is inserted into the steel strand and drives the steel strand to move towards the pulling-out direction of the steel strand; the metal limiting ring has a self-anchoring function, the inside of the metal limiting ring is connected with a spring, when the push rod is pushed to move towards the pulling-out direction of the steel strand, the spring is clamped into the groove, the groove is formed by three right trapezoid grooves with the same size side by side, the depth of the groove is 5-8 mm, the metal limiting ring is formed by a metal ring with the same right trapezoid cross section shape, the size of the metal limiting ring is smaller than the single groove size of the groove, namely, when the metal limiting ring moves towards the rear end, the metal limiting ring falls into the groove and can be limited to move towards the front end; the pre-movement direction of the steel strand can be regulated only in one direction and three gears due to the grooves and the metal limiting rings.
2. The sleeve-type prestress anchorage device suitable for steel strands according to claim 1, wherein the connecting bodies are distributed in a truncated cone shape and are used for connecting the push rod and the steel strands, and lubricating materials are smeared on contact interfaces of the connecting bodies and the sleeve.
3. A sleeve-type prestress anchor for steel strand according to claim 1, wherein the sleeve is perforated in four directions of 0 °, 90 °, 180 °, 270 ° in the circumferential direction, respectively, and the metal ring is mounted on the push rod.
4. A sleeve-type prestressed anchorage device suitable for steel strands according to claim 1, wherein the sleeve is composed of two identical half-sleeves for convenience of installation during construction, and for convenience of installation of the connector.
5. A sleeve-type prestress anchorage device suitable for steel strands according to claim 1, wherein the connector is provided with a reserved groove on the outer surface thereof, and a snap ring on the push rod is mounted and driven to move by the snap ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211106310.2A CN115355029B (en) | 2022-09-11 | 2022-09-11 | Sleeve type prestress anchorage device suitable for steel strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211106310.2A CN115355029B (en) | 2022-09-11 | 2022-09-11 | Sleeve type prestress anchorage device suitable for steel strand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115355029A CN115355029A (en) | 2022-11-18 |
| CN115355029B true CN115355029B (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211106310.2A Active CN115355029B (en) | 2022-09-11 | 2022-09-11 | Sleeve type prestress anchorage device suitable for steel strand |
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| CN (1) | CN115355029B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203821379U (en) * | 2014-01-24 | 2014-09-10 | 俞向阳 | Self-anchored steel strand pretensioned centrifugal concrete pile and steel strand locking structure |
| CN207331688U (en) * | 2017-10-24 | 2018-05-08 | 山东科技大学 | A kind of resistance to plucking expansion anchor rod |
| CN111255494A (en) * | 2020-02-25 | 2020-06-09 | 中铁隆昌铁路器材有限公司 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
| CN111648361A (en) * | 2020-06-30 | 2020-09-11 | 济南百士岩土工程有限公司 | Recoverable device for prestressed anchor cable and construction method thereof |
| CN111720148A (en) * | 2020-06-22 | 2020-09-29 | 辽宁大学 | Section coal pillar self-anchoring opposite-pulling anti-scour anchor cable and using method thereof |
| CN217403661U (en) * | 2022-05-09 | 2022-09-09 | 四川陆通检测科技有限公司 | Connector and counter-pulling device for detecting effective prestress under steel strand anchor after grouting |
-
2022
- 2022-09-11 CN CN202211106310.2A patent/CN115355029B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203821379U (en) * | 2014-01-24 | 2014-09-10 | 俞向阳 | Self-anchored steel strand pretensioned centrifugal concrete pile and steel strand locking structure |
| CN207331688U (en) * | 2017-10-24 | 2018-05-08 | 山东科技大学 | A kind of resistance to plucking expansion anchor rod |
| CN111255494A (en) * | 2020-02-25 | 2020-06-09 | 中铁隆昌铁路器材有限公司 | Lengthened anti-drop prestressed hollow grouting anchor rod and supporting method thereof |
| CN111720148A (en) * | 2020-06-22 | 2020-09-29 | 辽宁大学 | Section coal pillar self-anchoring opposite-pulling anti-scour anchor cable and using method thereof |
| CN111648361A (en) * | 2020-06-30 | 2020-09-11 | 济南百士岩土工程有限公司 | Recoverable device for prestressed anchor cable and construction method thereof |
| CN217403661U (en) * | 2022-05-09 | 2022-09-09 | 四川陆通检测科技有限公司 | Connector and counter-pulling device for detecting effective prestress under steel strand anchor after grouting |
Non-Patent Citations (1)
| Title |
|---|
| 不同荷载条件下预应力钢绞线双压花锚具性能的试验研究;赵均;郑玉伦;张志强;;北京工业大学学报;20070515(第05期);全文 * |
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| CN115355029A (en) | 2022-11-18 |
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