CN108930542B - Light high-strength composite carbon fiber confined concrete arch frame and construction method - Google Patents
Light high-strength composite carbon fiber confined concrete arch frame and construction method Download PDFInfo
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- CN108930542B CN108930542B CN201811032583.0A CN201811032583A CN108930542B CN 108930542 B CN108930542 B CN 108930542B CN 201811032583 A CN201811032583 A CN 201811032583A CN 108930542 B CN108930542 B CN 108930542B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
Abstract
The utility model discloses a light high-strength composite carbon fiber confined concrete arch frame and a construction method thereof. The composite carbon fiber restraint tube consists of an inner layer tube, a resin-impregnated carbon fiber interlayer and an outer layer tube, and all the layers are adhered by resin; the connecting sleeve is divided into a single-blocking snap ring closed sleeve and a double-blocking snap ring perforated sleeve, four fixing steel bar claws distributed in the circumferential direction are welded on two sides of the blocking snap ring of the single-blocking snap ring closed sleeve, and four fixing steel bar claws distributed in the circumferential direction are welded on the outer sides of the two blocking snap rings of the double-blocking snap ring perforated sleeve. The utility model can be used for roadway support, not only can improve the support strength, but also greatly reduces the whole weight of the arch centering, and is convenient for construction.
Description
Technical Field
The utility model relates to the technical field of mine roadway support, in particular to a light high-strength support arch frame for deep soft rock roadway support.
Background
In a deep soft rock roadway, surrounding rock has lower bearing capacity and obvious rheological property. If the support strength is insufficient, the rheological damage of surrounding rock can be continuously developed, and the roadway cannot be maintained stable for a long time. Therefore, it is very critical to apply a supporting structure with higher strength to the surrounding rock after the surrounding rock is deformed to a certain extent, and the supporting structure can effectively prevent the development of rheological damage and ensure the long-term stability of the surrounding rock. Under the condition, the confined concrete arch frame is used as a high-strength rigid support, and is widely applied to the support of deep soft rock tunnel due to the simple structure.
At present, most of confined concrete arches applied to mines and geotechnical engineering are steel pipe concrete arches and carbon fiber mould bag concrete arches, but the following problems exist in practical application of the confined concrete brackets.
Chinese patent No. CN201720406727.9 discloses a steel pipe concrete arch for roadway support, which consists of a steel pipe concrete arch body and a steel pipe, and has high strength and rigidity; however, the arch centering has the advantages of complex structure, high manufacturing cost and high erection difficulty, and is insufficient in limiting bending resistance when being used for supporting deep roadways.
The Chinese patent No. 201520955522.7 discloses a novel concrete bracket for deep roadway support, wherein the arch consists of a flexible pipe body, a beam clamp, a beam and concrete, wherein the flexible pipe body is formed by once processing a geotechnical mould bag and carbon fibers; the arch frame has the advantages that the arch frame can be molded by one-step pouring, the flexible pipe body is foldable and the speed of internal concrete is accelerated, but the carbon fiber layer of the arch frame is stuck on the inner side of a geotechnical mould bag, a large amount of broken stone with sharp stubbles is generated due to the breakage of core concrete when the arch frame is damaged, and the lining carbon fiber interlayer is directly contacted with the core concrete and is used as a tensile but non-shearing material, so that the carbon fiber interlayer can be sheared and damaged due to the shearing action of the broken stone, meanwhile, the direct contact of the flowing concrete and the lining carbon fiber layer can also cause certain damage to the carbon fiber in the process of pouring the concrete, so that the tensile strength of the carbon fiber layer is also greatly reduced, the tensile property of the carbon fiber material cannot be fully exerted, and finally the arch frame is insufficient in bearing capacity and the phenomena of early arch frame damage and the like are easy to occur.
In summary, the supporting effect and the construction speed of the conventional confined concrete arch frame on the deep soft rock roadway are not ideal, so that it is necessary to explore and research an arch frame supporting structure which is suitable for supporting the deep soft rock roadway and has light weight, high strength and easy installation.
Disclosure of Invention
The utility model provides a light high-strength composite carbon fiber confined concrete arch frame suitable for deep soft rock roadway support. The utility model has the advantages of light weight, high strength and easy installation, meets the requirement of controlling the deformation of the surrounding rock of the roadway, reduces the labor intensity of underground constructors for installing the arch frame in a narrow roadway space, and improves the construction efficiency.
The utility model relates to a light high-strength composite carbon fiber confined concrete arch frame, which is constructed by the following steps: the composite carbon fiber restraining tube consists of an inner layer tube, a resin-impregnated carbon fiber interlayer and an outer layer tube, wherein the resin-impregnated carbon fiber interlayer is positioned between the inner layer tube and the outer layer tube; the connecting sleeve is divided into a single-blocking snap ring closing sleeve and a double-blocking snap ring perforated sleeve, wherein the single-blocking snap ring closing sleeve is welded with one blocking snap ring, the double-blocking snap ring perforated sleeve is welded with two blocking snap rings, and a hole is additionally arranged between the two blocking snap rings; the fixed steel plate is welded on one side of the connecting sleeve, and the arch frame is anchored on the inner wall of the roadway.
In order to protect the carbon fiber cloth from being cut and damaged by broken stone, the tensile property of the carbon fiber material is fully exerted, all layers of the composite carbon fiber restraint pipe are adhered by resin, and the inner layer pipe and the outer layer pipe on two sides of the resin-impregnated carbon fiber interlayer can effectively reduce the cutting effect of broken stone on the carbon fiber cloth.
In order to improve the connection strength of the connecting sleeve, four fixed steel bar claws distributed in the circumferential direction are welded on two sides of the blocking clamping ring in the connecting sleeve, and the steel bar claws can be inserted into concrete after concrete pouring is completed, so that the connection strength of the connecting sleeve is greatly improved.
In order to avoid the reduction of the strength of the pipe body caused by directly drilling grouting holes and exhaust holes on the pipe body of the composite carbon fiber constraint pipe, the top connecting sleeve and the bottom connecting sleeve are double-barrier snap ring perforated sleeves, and the grouting holes and the exhaust holes are arranged between the two barrier snap rings, so that the integrity of the pipe body is ensured.
The utility model relates to a construction method of a light high-strength composite carbon fiber confined concrete arch frame, which comprises the following steps: when the pipe body is manufactured, the carbon fiber cloth is wound on the inner layer pipe coated with the resin binder and sleeved into the outer layer pipe, one end of the pipe body is immersed into the binder resin, and vacuum air suction is carried out at a gap of the other end of the pipe body to enable the resin to infiltrate the whole carbon fiber cloth interlayer, and the composite carbon fiber restraint pipe is formed after the resin is fully solidified; during construction, a plurality of composite carbon fiber restraint pipes are assembled into an integral pipe body through the connecting sleeve according to the section shape of the roadway, then the pipe body is anchored on the inner wall of the roadway through the fixed steel plate, and finally core concrete is poured through holes of the bottom connecting sleeve, so that an arch support structure is formed.
The light high-strength composite carbon fiber confined concrete arch frame has the advantages that:
(1) The utility model can fully exert the extremely strong tensile property of the carbon fiber material, the composite carbon fiber restraint pipe can modify the core concrete by applying strong restraint force to the core concrete, thereby greatly enhancing the bearing capacity of the arch frame and meeting the requirement of controlling the deformation of surrounding rock of the deep soft rock tunnel;
(2) When the support is carried out, a mode of firstly erecting the pipe body and then grouting is adopted, and as the restraint system outside the arch frame adopts the carbon fiber interlayer impregnated with resin between the inner layer pipe and the outer layer pipe, the weight of the carbon fiber interlayer is far lower than that of the steel pipe concrete arch frame, the labor intensity of underground constructors in carrying and installing the arch frame in a narrow roadway space is reduced, and the construction efficiency is greatly improved;
(3) The inner layer pipe and the outer layer pipe of the composite carbon fiber restraint pipe of the restrained concrete arch frame can be used as a protective layer of the resin-impregnated carbon fiber interlayer, and can play a role in protecting the inner carbon fiber, so that the material damage, even stripping, of the carbon fiber bundles caused by mixture particles in the concrete pouring process can be avoided, and the damage to the resin-impregnated carbon fiber interlayer during the arch frame installation can be avoided. The structure not only fully plays the excellent performance of the carbon fiber, but also weakens the defect of insufficient shearing resistance of the carbon fiber;
(4) The connecting sleeve is a rigid sleeve, can resist larger bending moment, and the steel bar claw in the connecting sleeve can extend into core concrete in the composite carbon fiber restraining tube, so that the axial connecting strength is greatly improved; simultaneously, the top connecting sleeve and the bottom connecting sleeve of the arch centering are double-barrier snap ring perforated sleeves, and the grouting holes and the exhaust holes are arranged between the two barrier snap rings, so that the reduction of the strength of the pipe body caused by directly perforating on the composite carbon fiber constrained pipe body can be avoided, and the integrity of the pipe body is ensured;
(5) The composite carbon fiber restraining tube limits the transverse deformation of core concrete, improves the compressive strength and the ductility of the core concrete, and avoids brittle failure of an arch frame;
(6) In terms of the supporting cost, the high cost of repeated repairing of the supporting structure can be avoided due to the strong bearing capacity, and the total supporting cost is lower.
Drawings
FIG. 1 is a schematic view of a composite carbon fiber restraint tube structure of the present utility model.
FIG. 2 is a cross-sectional view of the present utility model (without concrete).
Fig. 3 is a detailed view of the top connecting sleeve structure (double-blocking snap ring perforated sleeve) of the present utility model.
Fig. 4 is a detailed view of the bottom connecting sleeve structure (double-blocking snap ring perforated sleeve) of the present utility model.
Fig. 5 is a detailed view of the construction of the sidewall connecting sleeve of the present utility model (single-blocking snap ring closure sleeve).
Fig. 6 is a transverse cross-sectional view of a composite carbon fiber containment tube of the present utility model (filled with concrete).
Legend: the composite carbon fiber reinforced plastic pipe comprises a 1-outer layer pipe, a 2-resin-impregnated carbon fiber interlayer, a 3-inner layer pipe, a 4-connecting sleeve, a 5-fixed steel bar claw, a 6-blocking clamp ring, a 7-fixed steel plate, an 8-connecting rod fixing hole, a 9-sleeve anchoring hole, a 10-top connecting sleeve, an 11-top exhaust hole, a 12-bottom connecting sleeve, a 13-bottom grouting hole, a 14-fixed connecting rod, a 15-fixed bolt, 16-core concrete and a 17-composite carbon fiber constraint pipe.
Detailed Description
The light high-strength composite carbon fiber confined concrete arch frame shown in fig. 1 consists of a plurality of composite carbon fiber confined pipes 17, a connecting sleeve 4, a fixed steel plate 7 and core concrete 16, wherein the composite carbon fiber confined pipes consist of an outer layer pipe 1, an inner layer pipe 3 and a resin-impregnated carbon fiber interlayer 2, and the resin-impregnated carbon fiber interlayer 2 is positioned between the outer layer pipe 1 and the inner layer pipe 3 and is adhered into a whole through resin; the middle inside of the connecting sleeve is welded with a blocking clamping ring 6, four fixed steel bar claws 5 distributed in the circumferential direction are welded on two sides of the blocking clamping ring 6, and the strength of the connecting sleeve 4 is higher than that of a composite carbon fiber restraint tube 17; the fixed steel plate 7 is welded on one side of the connecting sleeve 4 and anchors the arch frame on the inner wall of the roadway.
The connecting sleeve 4 is divided into a single-blocking clasp closing sleeve and a double-blocking clasp opening sleeve, wherein the single-blocking clasp closing sleeve is welded with a blocking clasp 6 for connecting a composite carbon fiber restraint pipe on the side wall of a roadway; the double-blocking clasp perforated sleeve is welded with two blocking clasps 6, and holes are additionally formed between the two blocking clasps and used for connecting the composite carbon fiber restraint pipes 17 at the top and the bottom of the roadway. When the double-blocking snap ring perforated sleeve is used as the top connecting sleeve 10, the holes are the exhaust holes 11 for exhausting the gas in the pipe; when used as a bottom connecting sleeve 12, the holes are grouting holes 13 for pouring core concrete 16.
When the composite carbon fiber restraint tube is manufactured, the carbon fiber cloth is wound on the inner layer tube coated with the resin binder, in order to ensure that the space between the inner layer tube and the outer layer tube can be fully filled by the carbon fiber cloth, the carbon fiber cloth needs to be wound to a sufficient thickness and then sleeved into the outer layer tube, vacuum air suction is carried out at the gap between the inner layer tube and the outer layer tube at the other end, the resin is gradually upwards diffused from the carbon fiber cloth interlayer at the bottom under the action of atmospheric pressure until the whole carbon fiber cloth interlayer is infiltrated, and the composite carbon fiber restraint tube 17 is formed after the resin is fully solidified.
During construction, a plurality of composite carbon fiber restraint pipes 17 are assembled into an integral pipe body through the connecting sleeve 4 according to the section shape of a roadway, then the pipe body is anchored on the inner wall of the roadway through the fixed steel plate 7, finally core concrete 16 is poured through the grouting holes 13 of the bottom connecting sleeve 12, and gas in the pipe is discharged through the exhaust holes 11 of the top connecting sleeve 10, so that an arch supporting structure is finally formed.
Claims (3)
1. The light high-strength composite carbon fiber confined concrete arch frame consists of a plurality of composite carbon fiber confined pipes, a connecting sleeve, a fixed steel plate and core concrete, and is characterized in that the composite carbon fiber confined pipes consist of an inner layer pipe, a resin-impregnated carbon fiber interlayer and an outer layer pipe, the resin-impregnated carbon fiber interlayer is positioned between the inner layer pipe and the outer layer pipe, and the resin-impregnated carbon fiber interlayer is adhered into a whole through resin; the inner diameter of the connecting sleeve is equal to the outer diameter of the composite carbon fiber restraining tube, and the strength of the connecting sleeve is higher than that of the composite carbon fiber restraining tube; the connecting sleeve is divided into a single-blocking snap ring closing sleeve and a double-blocking snap ring opening sleeve, wherein the single-blocking snap ring closing sleeve is welded with one blocking snap ring, four circumferentially distributed fixed steel bar claws are welded on two axial sides of the single-blocking snap ring, two blocking snap rings are welded on the double-blocking snap ring opening sleeve, four circumferentially distributed fixed steel bar claws are welded on two outer sides of the double-blocking snap ring, and holes are additionally formed between the two blocking snap rings; the distance between the welding leg of the steel bar claw and the inner wall of the connecting sleeve is equal to the thickness of the composite carbon fiber restraint tube; when the double-blocking snap ring perforated sleeve is used as the top connecting sleeve, the holes are used for exhausting gas in the pipe; when the bottom connecting sleeve is used, the holes are used for pouring core concrete.
2. The light high-strength composite carbon fiber confined concrete arch frame according to claim 1, wherein the inner layer pipe and the outer layer pipe are made of steel or other materials with strength and rigidity not lower than those of steel, and the resin-impregnated carbon fiber interlayer inside the concrete arch frame is protected from being sheared by rocks or concrete fragments.
3. The construction method of the light high-strength composite carbon fiber confined concrete arch frame according to any one of claims 1-2, wherein when the composite carbon fiber confined pipe is manufactured, carbon fiber cloth is wound on an inner layer pipe coated with a resin binder and sleeved into an outer layer pipe, one end of the carbon fiber cloth is immersed in the binder resin, and vacuum air suction is carried out at a gap of the other end to enable the resin to infiltrate the whole carbon fiber interlayer, and the composite carbon fiber confined pipe is formed after the resin is fully solidified; during construction, a plurality of composite carbon fiber restraint pipes are assembled into an integral pipe body through the connecting sleeve according to the section shape of the roadway, then the pipe body is anchored on the inner wall of the roadway through the fixed steel plate, and finally core concrete is poured through holes of the bottom connecting sleeve, so that an arch support structure is formed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811032583.0A CN108930542B (en) | 2018-09-05 | 2018-09-05 | Light high-strength composite carbon fiber confined concrete arch frame and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811032583.0A CN108930542B (en) | 2018-09-05 | 2018-09-05 | Light high-strength composite carbon fiber confined concrete arch frame and construction method |
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| CN108930542A CN108930542A (en) | 2018-12-04 |
| CN108930542B true CN108930542B (en) | 2023-06-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112593979A (en) * | 2020-11-17 | 2021-04-02 | 中煤科工集团北京华宇工程有限公司 | Roadway support device |
| CN113944485A (en) * | 2021-10-15 | 2022-01-18 | 中国建筑土木建设有限公司 | CFRP confined concrete arch frame |
| CN114991810B (en) * | 2022-08-03 | 2022-11-22 | 山东建筑大学 | Composite supporting structure and construction method of wall rear mould bag grouting and high-strength support |
Citations (4)
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| BE792501A (en) * | 1971-12-22 | 1973-03-30 | Walbroehl H T | PROCEDURE AND FORMWORK FOR THE REALIZATION OF CONCRETE COATING OF GALLERIES, TUNNELS, WELLS, ETC. |
| CN101736860A (en) * | 2009-12-16 | 2010-06-16 | 沈阳建筑大学 | Circular cross-section steel-concrete-FRP solid composite column |
| CN106801611A (en) * | 2015-11-26 | 2017-06-06 | 山东科技大学 | A kind of deep tunnel supporting new concrete support |
| CN206707122U (en) * | 2017-03-10 | 2017-12-05 | 哈尔滨工业大学深圳研究生院 | A kind of concrete filled steel tube component of the steel tube confinement of sandwich |
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2018
- 2018-09-05 CN CN201811032583.0A patent/CN108930542B/en active Active
Patent Citations (4)
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| BE792501A (en) * | 1971-12-22 | 1973-03-30 | Walbroehl H T | PROCEDURE AND FORMWORK FOR THE REALIZATION OF CONCRETE COATING OF GALLERIES, TUNNELS, WELLS, ETC. |
| CN101736860A (en) * | 2009-12-16 | 2010-06-16 | 沈阳建筑大学 | Circular cross-section steel-concrete-FRP solid composite column |
| CN106801611A (en) * | 2015-11-26 | 2017-06-06 | 山东科技大学 | A kind of deep tunnel supporting new concrete support |
| CN206707122U (en) * | 2017-03-10 | 2017-12-05 | 哈尔滨工业大学深圳研究生院 | A kind of concrete filled steel tube component of the steel tube confinement of sandwich |
Non-Patent Citations (1)
| Title |
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| 浅论系统因素与矿山安全管理;屈俊涛;李辉;;西部探矿工程(第12期);第203-205页 * |
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