CN112253180A - Construction method for utilizing quadrangular pyramid reinforcing steel bar latticed shell roadway lining structure - Google Patents
Construction method for utilizing quadrangular pyramid reinforcing steel bar latticed shell roadway lining structure Download PDFInfo
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- CN112253180A CN112253180A CN202011421864.2A CN202011421864A CN112253180A CN 112253180 A CN112253180 A CN 112253180A CN 202011421864 A CN202011421864 A CN 202011421864A CN 112253180 A CN112253180 A CN 112253180A
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- quadrangular pyramid
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- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims abstract description 69
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 239000011435 rock Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000005507 spraying Methods 0.000 claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 25
- 230000002787 reinforcement Effects 0.000 claims description 18
- 238000005336 cracking Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract description 2
- 239000011440 grout Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/14—Lining predominantly with metal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- 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)
- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a construction method for a roadway lining structure by utilizing a quadrangular pyramid reinforcing steel bar latticed shell, which comprises the following specific steps: installing anchor rods in the surrounding rocks of the roadway, forming reinforcing rings in the surrounding rocks of the roadway, and adding a proper amount of anchor cables to expand the reinforcing rings to deep rock masses; embedding and fixing the quadrangular pyramid reinforcing steel bar latticed shell supports in surrounding rocks of the roadway in a pairwise manner to form a steel frame for supporting rock masses, and bearing pressure loads by working together with the surrounding rock reinforcing ring; then spraying a layer, selecting concrete to spray the layer, wherein the concrete spraying layer and the quadrangular pyramid reinforcing steel bar latticed shell support work together; in the supporting structure, the unique quadrangular pyramid structure can bear larger mine pressure by means of the characteristic of excellent stability of the triangle, and the pressure is dispersed step by step, so that the overall stability is good; the spray layer concrete wraps the reinforcing steel bars, so that the good compression characteristic of the concrete can be exerted, and in addition, the reinforcing steel bars hold the wrapped concrete, so that the deterioration phenomena of concrete grout skin falling and the like in the use process of the roadway are avoided.
Description
Technical Field
The invention relates to a construction method for a roadway lining structure by utilizing a quadrangular pyramid reinforcing steel bar latticed shell, and belongs to the technical field of mine support fixing.
Background
In the prior art, for a roadway with low surrounding rock pressure, anchor net spraying support is often adopted, the function of a reinforcing steel bar net is often limited to limiting falling rocks, and the effect of large ground pressure can be borne rarely; for the roadway with larger confining pressure, the U-shaped steel retractable support is widely adopted, has good section shape and geometric parameters, is easy to realize the shrinkage of the section steel after the lap joint, but the U-shaped steel support in China is far from being satisfactory in use condition and mainly shows that: firstly, the U-shaped steel support has low strength, and the deformation of a soft rock roadway cannot be effectively controlled, so that the deformation and the damage of the section steel support and a joint clamping cable are serious, the recovery rate is very low, and the U-shaped steel support is usually used as one-time investment; secondly, in practical application, the contractibility of the U-shaped steel support is very small and is far less than 20% of the section of the roadway, and in Germany, the U-shaped steel support still does not lose the bearing capacity when the section of the roadway is contracted by 35% or even higher; thirdly, the mechanical property analysis of the U-shaped steel support shows that the ultimate stress of the support under the action of the surrounding rock ground pressure is mainly caused by bending moment, and the support loses stability and retractility due to larger side pressure and uneven surrounding rock distribution in a deep-buried soft rock roadway, so that the excellent mechanical property of the support is weakened.
The invention relates to a steel bar reticulated shell support and a reticulated shell bolting-shotcreting support method, wherein steel bars are welded into arc-shaped and flat reticulated shell structures with connecting plates at two ends as support members, and the arc-shaped and flat reticulated shell structures are connected into a support by a plurality of members and bolts to form a reticulated shell bolting-shotcreting structure together with anchor rods and a shotcreting layer; in another patent of the invention with patent number 201710142153.3, a three-dimensional steel bar net rack and concrete combined lining structure, the three-dimensional steel bar net rack comprises a main net lattice and a secondary net lattice, and the secondary net lattice is connected with the main net lattice through inter-frame connecting ribs. The above mentioned are all improved schemes for anchor net spraying support, but in the actual construction process, it is usually formed by splicing several parts, the stress is usually transferred to the latticed secondary net grillage by the reinforcing steel bar close to the roadway first stress, the form is complex, and the section of the mine roadway is small, and it is not easy to adjust after the preset section form is selected. A portable supporting form with higher supporting strength than an anchor net spraying supporting structure and lower supporting cost than a U-shaped steel supporting structure is needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a construction method for a roadway lining structure by utilizing a quadrangular pyramid reinforcing steel bar reticulated shell, the supporting strength of the construction method is higher than that of a common anchor net-jet supporting structure, the supporting cost is lower than that of a U-shaped steel supporting structure, the steel consumption is greatly reduced, and the construction method is a light supporting form and comprises the following specific steps:
installing anchor rods in the surrounding rocks of the roadway, forming reinforcing rings in a certain range of the surrounding rocks of the roadway, and adding a proper amount of anchor cables to expand the reinforcing rings to deep rock masses in consideration of limited depth and strength of the reinforcing rings; embedding and fixing the quadrangular pyramid reinforcing steel bar latticed shell supports in surrounding rocks of the roadway in a pairwise manner to form a steel frame for supporting rock masses, and bearing pressure loads by working together with the surrounding rock reinforcing ring;
then spraying a layer, wherein concrete is selected for spraying the layer, the toughness of the layer is excellent, and the concrete spraying layer and the quadrangular pyramid reinforcing steel bar latticed shell support work together and deform without cracking;
the quadrangular pyramid reinforcing steel bar latticed shell support comprises a plurality of transverse arch frames which are arranged at equal intervals, a plurality of longitudinal connecting frames which are uniformly distributed, and connecting rods which are used for connecting the transverse arch frames and the longitudinal connecting frames to form a quadrangular pyramid shape.
The preferable scheme of the construction method for the roadway lining structure by utilizing the quadrangular pyramid reinforcement cage is as follows: the transverse arch frame and the longitudinal connecting frame are arranged in a non-coplanar vertical space.
The preferable scheme of the construction method for the roadway lining structure by utilizing the quadrangular pyramid reinforcement cage is as follows: the included angle between the adjacent connecting rods is 35-75 degrees.
The preferable scheme of the construction method for the roadway lining structure by utilizing the quadrangular pyramid reinforcement cage is as follows: the included angle between the adjacent connecting rods is 45 degrees.
The preferable scheme of the construction method for the roadway lining structure by utilizing the quadrangular pyramid reinforcement cage is as follows: the technical requirements in the construction process are as follows:
1) when a tunnel is excavated or deforms greatly and needs to be repaired, the size and the shape of the quadrangular pyramid reinforcing steel bar latticed shell support are designed according to use requirements, and before the quadrangular pyramid reinforcing steel bar latticed shell support is erected, the full height, the middle span and the bottom span of the cross section cannot be smaller than the designed size, so that the quadrangular pyramid reinforcing steel bar latticed shell support is ensured to be erected smoothly;
2) during construction, the square pyramid reinforcing steel bar latticed shell support is erected according to the designed size, the support shape of the square pyramid reinforcing steel bar latticed shell support is guaranteed not to be distorted, and the flatness deviation of the support after erection is not more than 10 mm; the deviation of the sizes of the full height, the mid span and the bottom span of the quadrangular pyramid reinforcing steel bar latticed shell bracket from the design size is not more than 20 mm;
3) two adjacent quadrangular pyramid reinforcing steel bar latticed shell brackets are closely arranged without gaps, and are connected by U-shaped cards to form a continuous supporting system;
4) the outer edge of each quadrangular pyramid reinforcing steel bar latticed shell support must be in good contact with surrounding rocks, and the support is not allowed to be overhead; filling the quadrangular pyramid reinforcing steel bar latticed shell bracket immediately after the construction is finished so as to ensure the filling quality behind the wall, and if the gap is within 300mm, directly using concrete for spraying; the gap is too large, and the gap can be filled by wood wedges, gangue or concrete precast slabs.
5) Because the quadrangular pyramid reinforcement latticed shell support is designed to have no back cover, in order to prevent the side wall from kicking out, particularly the ditch side, an anchor rod which inclines downwards by 45 degrees is respectively drilled at the lower part of each quadrangular pyramid reinforcement latticed shell support, and simultaneously, in order to enhance the integral strength of the quadrangular pyramid reinforcement latticed shell support, an anchor rod is respectively arranged above and below the joint part of the arch shoulder at each side; the length of the anchor rod is 2.0m, and the end part of the anchor rod is adopted for anchoring the anchor rod; supporting the longitudinal ribs in the middle of two ends of the quadrangular pyramid steel bar net shell support by using the anchor rod supporting plate so as to reduce the shearing force born by the two ends and weaken the inward displacement of the bottom feet and the arch shoulders;
6) after the quadrangular pyramid reinforcing steel bar latticed shell support is erected for 2-3 frames, whether the section size meets the design requirement needs to be checked, the position is adjusted if necessary, after the section size is qualified, concrete can be sprayed again, a spraying layer is designed, the concrete is required to cover the support reinforcing steel bars, and a 10-20 mm protective layer is formed.
The preferable scheme of the construction method for the roadway lining structure by utilizing the quadrangular pyramid reinforcement cage is as follows: the quadrangular pyramid reinforcing steel bar latticed shell support is a straight wall semicircular arch, a three-center arch or a circle, and when the quadrangular pyramid reinforcing steel bar latticed shell support is a circle or a three-center arch, the quadrangular pyramid reinforcing steel bar latticed shell support can be sealed.
The invention has the beneficial technical effects that:
1) in the supporting structure, the quadrangular pyramid steel bar reticulated shell support and the spraying layer are main bearing structures, and the unique quadrangular pyramid structure can bear larger mine pressure by virtue of the characteristic of excellent stability of a triangle, and disperse the pressure step by step, so that the overall stability of the steel bar reticulated shell support is good;
2) the quadrangular pyramid steel bar latticed shell support uses quadrangular pyramids as basic stress units, the shape and the size of the support can be adjusted according to actual needs, such as a straight wall semicircular arch, a three-center arch, a circle and the like, and the construction requirements of different sections in the roadway supporting process are met;
3) the spray layer concrete wraps the reinforcing steel bars, so that the good compression characteristic of the concrete can be exerted, and in addition, the reinforcing steel bars hold the wrapped concrete, so that the deterioration phenomena of concrete grout skin falling and the like in the use process of the roadway are avoided.
4) The quadrangular pyramid steel bar reticulated shell support is matched with an anchor rod, an anchor cable and a concrete spraying layer for use, and forms a continuous space supporting structure, through indoor model tests and field test tests, the supporting capability of the technical scheme is superior to that of a common anchor mesh-spraying supporting structure, and the supporting cost is lower than that of a U-shaped steel supporting structure, compared with a steel bar reticulated shell support and a reticulated shell anchor-spraying supporting method in the prior art (patent number: 00119101.2) and "three-dimensional steel net frame and concrete composite lining structure" (patent No.: 201710142153.3) overcomes the defects that the steel is formed by splicing a plurality of parts, the stress is transmitted layer by layer, the form is complex, and the steel consumption is greatly reduced compared with the steel consumption.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view of a quadrangular pyramid reinforcement cage support;
FIG. 3 is a schematic view of the connection among the transverse arch, the longitudinal connecting frame and the connecting rod;
FIG. 4 is a schematic view of a lining structure of a roadway using a quadrangular pyramid steel bar latticed shell;
in the figure: 10-quadrangular pyramid reinforcing steel bar latticed shell bracket; 11-transverse arch; 12-longitudinal connecting frame; 13-a connecting rod; 20-spraying concrete layer; 30-anchor rod; 40-anchor cable.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Referring to fig. 1 to 4, as a first embodiment of the present invention, taking a section of a roadway as a straight wall semicircular arch as an example, a construction method of a roadway lining structure using a quadrangular pyramid reinforcing steel bar latticed shell is provided, which specifically comprises the following steps:
installing anchor rods 30 in the surrounding rocks of the roadway, forming reinforcing rings in a certain range of the surrounding rocks of the roadway, and adding a proper amount of anchor cables 40 to expand the reinforcing rings to deep rock masses in consideration of limited depth and strength of the reinforcing rings; then the quadrangular pyramid reinforcing steel bar latticed shell support 10 is embedded and fixed in the surrounding rock of the roadway by pairwise splicing to form a steel frame for supporting the rock mass, and the steel frame and the surrounding rock reinforcing ring work together to bear pressure load;
then spraying a layer, wherein concrete is selected for spraying the layer 20, the toughness of the layer is excellent, and the concrete spraying layer 20 and the quadrangular pyramid reinforcing steel bar latticed shell support 10 work together and deform without cracking;
the quadrangular pyramid reinforcement latticed shell support 10 comprises a plurality of transverse arches 11 arranged at equal intervals, a plurality of longitudinal connecting frames 12 uniformly distributed, and connecting rods 13 which connect the transverse arches 11 and the longitudinal connecting frames 12 to form a quadrangular pyramid shape.
The transverse arch 11 and the longitudinal connecting frame 12 are arranged in a vertical space with different surfaces.
The included angle between the adjacent connecting rods 13 is 35-75 degrees. Preferably, the included angle between adjacent connecting rods 13 is 45 °.
The construction method for the lining structure of the roadway by utilizing the quadrangular pyramid reinforcement latticed shell has the following technical requirements in the construction process:
1) the section form after the tunnel is excavated or repaired is a straight wall semicircular arch, before the quadrangular pyramid reinforcing steel bar latticed shell support 10 is erected, the full height, the midspan and the bottom span of the section can not be smaller than the designed size, so that the quadrangular pyramid reinforcing steel bar latticed shell support 10 can be smoothly erected;
2) during construction, the quadrangular pyramid reinforcing steel bar latticed shell support 10 is erected according to the designed size, the support shape is guaranteed not to be distorted, and the flatness deviation of the support after erection is not more than 10 mm; the deviation of the sizes of the full height, the mid span and the bottom span of the quadrangular pyramid reinforcing steel bar latticed shell bracket 10 from the design size is not more than 20 mm;
3) two adjacent quadrangular pyramid reinforcing steel bar latticed shell brackets 10 are closely arranged without gaps, and are connected by U-shaped cards to form a continuous supporting system;
4) the outer edge of each quadrangular pyramid reinforcing steel bar latticed shell bracket 10 must be in good contact with surrounding rocks and is not allowed to be overhead; after the construction of one quadrangular pyramid reinforcing steel bar latticed shell support 10 is finished, filling is carried out immediately to ensure the filling quality behind the wall, and if the gap is within 300mm, concrete can be directly sprayed and compacted; the gap is too large, and the gap can be filled by wood wedges, gangue or concrete precast slabs.
5) Because the quadrangular pyramid reinforcing steel bar latticed shell support 10 is designed without a back cover, in order to prevent the side wall from kicking out, particularly the ditch side, an anchor rod 30 which inclines downwards by 45 degrees is respectively drilled at the lower part of each quadrangular pyramid reinforcing steel bar latticed shell support 10, and simultaneously, in order to enhance the integral strength of the quadrangular pyramid reinforcing steel bar latticed shell support 10, an anchor rod 30 is respectively arranged above and below the joint part of the arch shoulder at each side; the length of the anchor rod 30 is 2.0m, and the anchor rod 30 is anchored by adopting the end part; supporting the middle longitudinal ribs at the two ends of the quadrangular pyramid reinforcing steel bar net shell support 10 by using an anchor rod 30 supporting plate so as to reduce the shearing force borne by the two ends and weaken the inward displacement of the bottom feet and the arch shoulders;
6) after the quadrangular pyramid reinforcing steel bar latticed shell support 10 is erected for 2-3 frames, whether the section size meets the design requirement needs to be checked, the position is adjusted if necessary, after the section size is qualified, concrete can be sprayed again, a spraying layer is designed, the concrete is required to cover the support reinforcing steel bars, and a 10-20 mm protective layer is formed.
The concrete sprayed layer 20 is constructed by two steps of primary support and secondary support. The early-stage support is to seal the rock surface by a sprayed layer with the thickness of about 25mm, if necessary, to install short anchor rods 30 and anchor cables 40 with the spacing of about 1.2m, as the temporary support measure of the working face, and then to continuously install the quadrangular pyramid reinforcing steel bar reticulated shell support 10 to bear partial surrounding rock pressure. The quadrangular pyramid reinforcing steel bar latticed shell support 10 has the supporting capacity equivalent to that of a common steel support, and is used for continuously supporting the surrounding rock, so that the surrounding rock can be effectively prevented from being loosened and damaged, and the deformation rate of the surrounding rock is reduced.
And after the primary support is finished, carrying out secondary support according to different degrees of continuous appearance of the deformation of the surrounding rock. If the deformation of the surrounding rock gradually becomes stable, the outer layer steel bar support can be completely covered by re-spraying concrete with the thickness of about 25mm after the roadway construction is finished, and then the permanent support is completed. If the deformation of the roadway is still strong, the roadway does not need to wait for the deformation to be stable passively, concrete with the thickness of about 100mm can be sprayed again, and the steel bar arch shell of the support can be completely covered to form a lining structure to be used as a permanent support.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A construction method for utilizing a quadrangular pyramid reinforcing steel bar latticed shell roadway lining structure is characterized by comprising the following steps: the specific construction method comprises the following steps:
installing anchor rods (30) in the surrounding rocks of the roadway, forming reinforcing rings in a certain range of the surrounding rocks of the roadway, and adding a proper amount of anchor cables (40) to expand the reinforcing rings to deep rock masses in consideration of limited depth and strength of the reinforcing rings; then, the quadrangular pyramid reinforcing steel bar latticed shell support (10) is embedded and fixed in surrounding rocks of the roadway in a pairwise splicing manner to form a steel frame for supporting rock mass, and the steel frame and the surrounding rock reinforcing ring work together to bear pressure load;
then, spraying a layer, wherein concrete is selected for the spraying layer, the toughness of the spraying layer is excellent, and the concrete spraying layer (20) and the quadrangular pyramid reinforcing steel bar latticed shell support (10) work together and deform without cracking;
the quadrangular pyramid reinforcing steel bar latticed shell support (10) comprises a plurality of transverse arch frames (11) which are arranged at equal intervals, a plurality of longitudinal connecting frames (12) which are uniformly distributed, and connecting rods (13) which are used for connecting the transverse arch frames (11) and the longitudinal connecting frames (12) and enable the transverse arch frames to form a quadrangular pyramid shape.
2. The construction method of the roadway lining structure by using the quadrangular pyramid reinforcement cage according to claim 1, wherein: the transverse arch frame (11) and the longitudinal connecting frame (12) are arranged in a vertical space with different surfaces.
3. The construction method of a lining structure of a roadway by using a quadrangular pyramid reinforcement cage according to claim 1 or 2, wherein: the included angle between the adjacent connecting rods (13) is 35-75 degrees.
4. The construction method of the roadway lining structure by using the quadrangular pyramid reinforcement cage according to claim 3, wherein: the included angle between the adjacent connecting rods (13) is 45 degrees.
5. The construction method of the roadway lining structure by using the quadrangular pyramid reinforcement cage according to claim 1, wherein: the technical requirements in the construction process are as follows:
1) when a tunnel is excavated or deformed greatly and needs to be repaired, the size and the shape of the quadrangular pyramid reinforcing steel bar latticed shell support (10) are designed according to use requirements, and before the quadrangular pyramid reinforcing steel bar latticed shell support (10) is erected, the full height, the middle span and the bottom span of the cross section cannot be smaller than the designed size, so that the quadrangular pyramid reinforcing steel bar latticed shell support (10) is ensured to be erected smoothly;
2) during construction, the quadrangular pyramid reinforcing steel bar latticed shell support (10) is erected according to the designed size, the shape of the quadrangular pyramid reinforcing steel bar latticed shell support is guaranteed not to be distorted, and the flatness deviation of the support after erection is not more than 10 mm; the deviation of the sizes of the full height, the middle span and the bottom span of the quadrangular pyramid reinforcing steel bar latticed shell bracket (10) and the design size is not more than 20 mm;
3) two adjacent quadrangular pyramid reinforcing steel bar latticed shell brackets (10) are closely arranged without gaps, and are connected by U-shaped cards to form a continuous supporting system;
4) the outer edge of each quadrangular pyramid reinforcing steel bar latticed shell bracket (10) is required to be in good contact with surrounding rocks and is not allowed to be overhead; after the construction of a quadrangular pyramid reinforcing steel bar latticed shell support (10) is finished, filling is carried out immediately to ensure the filling quality behind the wall, and if the gap is within 300mm, the quadrangular pyramid reinforcing steel bar latticed shell support can be directly sprayed and compacted by concrete; the gap is too large, and the wooden wedge, the gangue or the concrete precast slab can be used for filling;
5) because the quadrangular pyramid reinforcing steel bar latticed shell support (10) is designed without sealing the bottom, in order to prevent the side wall from kicking out, particularly the ditch side, an anchor rod 30 which inclines downwards by 45 degrees is respectively drilled at the lower part of each quadrangular pyramid reinforcing steel bar latticed shell support (10), and simultaneously, in order to enhance the integral strength of the quadrangular pyramid reinforcing steel bar latticed shell support (10), an anchor rod 30 is respectively arranged above and below the joint part of the arch shoulder at each side; the length of the anchor rod 30 is 2.0m, and the anchor rod 30 is anchored by adopting the end part; supporting the middle longitudinal ribs at two ends of a quadrangular pyramid reinforcing steel bar net shell support (10) by using an anchor rod 30 supporting plate so as to reduce the shearing force born by the two ends and weaken the inward displacement of the bottom feet and the arch shoulders;
6) after the quadrangular pyramid reinforcement latticed shell support (10) is erected for 2-3 frames, whether the section size meets the design requirement needs to be checked, the position is adjusted if necessary, after the section size is qualified, concrete can be sprayed again, a spraying layer is designed, the concrete is required to cover the support reinforcement, and a 10-20 mm protective layer is formed.
6. The construction method of the roadway lining structure by using the quadrangular pyramid reinforcement cage according to claim 5, wherein: the quadrangular pyramid reinforcing steel bar reticulated shell support (10) is a straight-wall semicircular arch, a three-center arch or a round shape, and can be sealed at the bottom when the quadrangular pyramid reinforcing steel bar reticulated shell support is round or three-center arch.
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| CN106640146A (en) * | 2017-03-07 | 2017-05-10 | 安徽理工大学 | Three-dimensional steel bar net rack and concrete combined lining structure |
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2020
- 2020-12-08 CN CN202011421864.2A patent/CN112253180A/en active Pending
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|---|---|---|---|---|
| CN1306150A (en) * | 2000-06-11 | 2001-08-01 | 郭兰波 | Reinforcing bar netted chock and netted-shell bolting and shotcrete support |
| WO2010095968A2 (en) * | 2009-02-19 | 2010-08-26 | Milenko Milinkovic | Prefabricated construction object which is built from prefabricated ferocement rib elements by sandwich type which are effused in moulds |
| CN106013447A (en) * | 2016-06-27 | 2016-10-12 | 哈尔滨工业大学空间钢结构幕墙有限公司 | CFST (concrete filled steel tube) arched space grid structure |
| CN106640146A (en) * | 2017-03-07 | 2017-05-10 | 安徽理工大学 | Three-dimensional steel bar net rack and concrete combined lining structure |
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| Title |
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| 山西省煤矿设计院: "平板网架结构的应用", 《煤矿设计》, no. 1, 31 January 1978 (1978-01-31), pages 15 - 19 * |
| 马守龙: "高应力软岩巷道聚丙烯纤维混凝土钢筋网壳复合衬砌新技术研究及应用", 《工程科技Ⅰ辑》, 15 March 2009 (2009-03-15), pages 021 - 16 * |
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Application publication date: 20210122 |