CN212316940U - Flexible surface layer assembled soil nailing wall structure - Google Patents
Flexible surface layer assembled soil nailing wall structure Download PDFInfo
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- CN212316940U CN212316940U CN202020545415.8U CN202020545415U CN212316940U CN 212316940 U CN212316940 U CN 212316940U CN 202020545415 U CN202020545415 U CN 202020545415U CN 212316940 U CN212316940 U CN 212316940U
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- 239000002689 soil Substances 0.000 title claims abstract description 74
- 239000002344 surface layer Substances 0.000 title claims abstract description 61
- 238000003825 pressing Methods 0.000 claims abstract description 33
- 239000011148 porous material Substances 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000011368 organic material Substances 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 14
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 239000004566 building material Substances 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 238000005475 siliconizing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A flexible surface layer assembly type soil nailing wall structure comprises soil nails, a flexible surface layer, prefabricated connecting pieces, horizontal beams and oblique beams; the flexible surface layer is laid on the side slope; the prefabricated connecting piece comprises a pressing plate and a convex block; the pressing plate comprises a transverse edge and a vertical edge; the convex block is arranged at the cross point of the pressing plate, and the vertical section of the convex block is square or rectangular; the prefabricated connecting pieces are arranged in a matrix shape; the convex block is vertically pressed on the flexible surface layer; the middle part of the prefabricated connecting piece is provided with at least one positioning and mounting pore channel; the horizontal beams are correspondingly arranged between the prefabricated connecting pieces which are adjacent in the transverse direction; two ends of the transverse edge of the pressing plate are pressed on the horizontal beams at two sides; the oblique beams are correspondingly arranged between the obliquely adjacent prefabricated connecting pieces; two ends of the vertical edge of the pressing plate are pressed on the oblique beams on the two sides; the soil nails correspondingly penetrate through the positioning and mounting pore passages of the prefabricated connecting pieces. The utility model provides a traditional soil nail wall structure atress mechanism unclear, the node atress is weak, extravagant building material, the feature of environmental protection is poor and the technical problem that the efficiency of construction is low.
Description
Technical Field
The utility model belongs to the design and the construction field of geotechnical engineering excavation supporting and side slope, especially a flexible surface course assembled soil nailing wall structure.
Background
The soil nailing wall is a soil retaining structure for keeping the side wall or side slope of a foundation pit stable during soil excavation, and mainly comprises slender rod pieces, soil nails, a reinforced concrete surface layer and a reinforced soil body, wherein the slender rod pieces are densely distributed in an in-situ soil body, the reinforced concrete surface layer is adhered to the surface of the soil body, and the reinforced soil body is arranged between the soil nails. The current soil nailing wall process comprises the following steps: firstly, manufacturing and installing soil nails after excavation of a foundation pit and a side slope, then paving a reinforcing mesh on the surfaces of the foundation pit and the side slope, and spraying a layer of concrete surface layer to form a foundation pit and side slope supporting system consisting of the soil nails, the sprayed concrete rigid surface layer and a reinforced soil body. The key points of the structure are as follows: 1. the reinforced bar member (i.e. soil nail or anchor bar) arranged in the slope body is firmly bonded with the soil body around the reinforced bar member to form a complex, and 2, the reinforced bar mesh is woven and concrete is sprayed to form a rigid surface layer. The existing soil nailing wall technology has the following defects: 1. the mechanical stress mechanism of a supporting system consisting of the soil nails, the reinforced concrete surface layer and the reinforced soil body is not clear. 2. The joint of the soil nail and the surface layer is weak in stress. 3. Concrete facings waste large amounts of non-recyclable construction materials. 4. The on-site sprayed concrete does not meet the environmental protection requirement. 5. The construction speed is slow, and the efficiency is low. The current soil nailing wall technology does not meet the requirements of energy conservation, environmental protection and high efficiency of modern building technology more and more.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a flexible surface course assembled soil nailing wall structure, the technical problem that traditional soil nailing wall structure atress mechanism is unclear, the node atress is weak, extravagant building material, feature of environmental protection are poor and the efficiency of construction is low is solved.
In order to achieve the above purpose, the utility model adopts the following technical scheme.
A flexible surface layer assembly type soil nailing wall structure is arranged on a side slope and comprises soil nails; the device also comprises a flexible surface layer, a prefabricated connecting piece, a horizontal beam and an oblique beam; the flexible surface layer is fully paved on the side slope, and the top of the flexible surface layer extends to the horizontal ground at the top of the side slope; the prefabricated connecting piece comprises a pressing plate and a convex block arranged on the back of the pressing plate; the vertical section of the pressing plate is in a cross shape and comprises a transverse edge and a vertical edge; the convex block is arranged at the cross intersection point of the pressing plate, and the vertical section of the convex block is square or rectangular; the width of the lug is not more than that of the vertical edge, and the thickness of the lug is not more than that of the transverse edge; the prefabricated connecting pieces are provided with a group and are arranged in a matrix shape; the convex block of each prefabricated connecting piece is vertically pressed on the flexible surface layer; at least one positioning and mounting pore channel is arranged in the middle of the prefabricated connecting piece; the positioning and mounting pore channel is vertical to the flexible surface layer; the horizontal beams are provided with a group and are correspondingly arranged between the prefabricated connecting pieces which are adjacent in the transverse direction; two ends of the transverse edge of the pressing plate are respectively pressed on the horizontal beams at two sides, and the transverse edge is connected with the horizontal beams; the inclined beams are provided with a group and are correspondingly arranged between the obliquely adjacent prefabricated connecting pieces; two ends of the vertical edge of the pressing plate are respectively pressed on the oblique beams on two sides, and the vertical edge is connected with the oblique beams; the soil nails correspondingly penetrate through the positioning and mounting hole channels of the prefabricated connecting pieces, the upper ends of the soil nails are locked on the outer side surfaces of the pressing plates through anchor devices, and the lower ends of the soil nails are anchored in soil bodies of the side slopes.
Preferably, the flexible surface layer material is a geosynthetic material, a cement cloth or a waterproof coiled material; the thickness of the flexible surface layer is 1 mm-30 mm; the width of the part, extending to the horizontal ground at the top of the side slope, of the top of the flexible surface layer is 0.5-1.5 m.
Preferably, a grouting layer is arranged between the flexible surface layer and the side slope; the material of the grouting layer adopts cement slurry or siliconizing slurry or alkali liquor.
Preferably, the pressing plate and the lug are integrally formed; the thickness of the pressing plate is 2 cm-25 cm; the length of the lug is adapted to the gap between adjacent horizontal beams and is 10-30 cm; the width of the lug is adapted to the gap between adjacent oblique beams and is 10-30 cm; the thickness of the lug is 5 cm-30 cm corresponding to the thickness of the horizontal beam and the inclined beam.
Preferably, the prefabricated connecting piece is made of reinforced concrete or steel or made of a high-molecular organic material or made of carbon fiber; wherein, the high-molecular organic material is high-strength resin or high-strength glass fiber.
Preferably, the materials of the horizontal beam and the oblique beam are matched with the material of the prefabricated connecting piece.
Preferably, the lap joint length of the transverse edge and the horizontal beam on the corresponding side is 5-30 cm; the lap joint length of the vertical side and the inclined beam on the corresponding side is 5 cm-30 cm.
Preferably, the vertical edges and the oblique beams are connected by adopting a buckle connection or a bolt connection or an embedded part welding connection; the transverse edges and the horizontal beams are connected by adopting a buckle connection or a bolt connection or an embedded part welding connection.
Compared with the prior art, the utility model has the following characteristics and beneficial effect.
1. A large number of supporting components are produced and processed in a workshop, the types of the prefabricated components mainly comprise horizontal beams, oblique beams, prefabricated connecting pieces and flexible surface layers, and a large number of assembly operations are adopted on site, so that the ring joints of the concrete sprayed on the site are completely eliminated; the construction method has high production efficiency, the cost of corresponding components is reduced, and the cost performance of the flexible surface layer assembly type soil nailing wall structure is higher and higher by matching with the digital management of a factory.
2. The utility model realizes the factory standardized prefabrication and the on-site assembly type installation of main components through the soil nail construction, the laying of the flexible surface layer and the on-site installation of the horizontal beam, the oblique beam and the prefabricated connecting piece; during construction, the connecting members do not need to be maintained, and the supporting structure can be disassembled and recycled after being used, so that building materials are saved, the environment-friendly and efficient mounting is realized, the standardized assembled detachable supporting structure is really realized, and the modern building construction requirements of high efficiency, energy conservation and environmental protection are met.
3. The method of the utility model does not need to pour concrete on site, and has the advantages of environmental protection, meeting the requirements of green buildings and having little influence on the surrounding environment; additionally, the utility model discloses a method still has water conservation, economize on the ground, fall the sound and fall and make an uproar and do not have raise dust, construction convenience, and the installation rate is fast, and the quality of the quick supporting construction component of engineering progress obtains the advantage of guaranteeing easily.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic plan view of the flexible surface layer assembled soil nailing wall structure of the present invention.
Fig. 2 is a schematic sectional view of the flexible surface layer assembled soil nailing wall structure of the present invention.
Fig. 3 is a schematic cross-sectional view of the prefabricated connecting member of the present invention disposed on the flexible surface layer.
Fig. 4 is a schematic front structural view of the prefabricated connecting piece of the present invention.
Fig. 5 is a schematic sectional view of a-a in fig. 4.
Fig. 6 is a schematic structural view of a horizontal beam in the present invention.
Fig. 7 is a schematic structural view of the middle oblique beam of the present invention.
Reference numerals: 1-side slope, 2-soil nail, 3-flexible surface layer, 4-prefabricated connecting piece, 4.1-pressing plate, 4.1.1-transverse edge, 4.1.2-vertical edge, 4.2-convex block, 5-horizontal beam, 6-oblique beam, 7-positioning mounting hole channel, 8-grouting layer and 9-anchorage device.
Detailed Description
As shown in fig. 1-7, the flexible surface layer assembly type soil nailing wall structure is arranged on a side slope 1 and comprises soil nails 2; the device also comprises a flexible surface layer 3, a prefabricated connecting piece 4, a horizontal beam 5 and an oblique beam 6; the flexible surface layer 3 is fully paved on the side slope 1, and the top of the flexible surface layer 3 extends to the horizontal ground at the top of the side slope 1; the prefabricated connecting piece 4 comprises a pressing plate 4.1 and a convex block 4.2 arranged at the back of the pressing plate 4.1; the vertical section of the pressing plate 4.1 is in a cross shape and comprises a transverse edge 4.1.1 and a vertical edge 4.1.2; the bump 4.2 is arranged at the cross intersection point of the pressing plate 4.1, and the vertical section of the bump 4.2 is square or rectangular; the width of the lug 4.2 is not more than that of the vertical edge 4.1.2, and the thickness of the lug 4.2 is not more than that of the transverse edge 4.1.1; the prefabricated connecting pieces 4 are provided with a group and are arranged in a matrix shape; the convex block 4.2 of each prefabricated connecting piece 4 is vertically pressed on the flexible surface layer 3; at least one positioning and mounting hole channel 7 is arranged in the middle of the prefabricated connecting piece 4; the positioning and mounting hole channel 7 is vertical to the flexible surface layer 3; the horizontal beams 5 are provided with a group and correspondingly arranged between the prefabricated connecting pieces 4 which are adjacent in the transverse direction; two ends of a transverse edge 4.1.1 of the pressing plate 4.1 are respectively pressed on the horizontal beams 5 at two sides, and the transverse edge 4.1.1 is connected with the horizontal beams 5; the inclined beams 6 are provided with a group and correspondingly arranged between the obliquely adjacent prefabricated connecting pieces 4; two ends of a vertical edge 4.1.2 of the pressing plate 4.1 are respectively pressed on the oblique beams 6 at two sides, and the vertical edge 4.1.2 is connected with the oblique beams 6; the soil nails 2 correspondingly penetrate through the positioning and mounting hole channels 7 of the prefabricated connecting pieces 4, the upper ends of the soil nails 2 are locked on the outer side surfaces of the pressing plates 4.1 through anchors 9, and the lower ends of the soil nails 2 are anchored in soil bodies of the side slopes 1.
In the embodiment, the flexible surface layer 3 is made of a geosynthetic material, a cement cloth or a waterproof coiled material; the thickness of the flexible surface layer 3 is 1 mm-30 mm; the width of the part, extending to the horizontal ground at the top of the side slope 1, of the top of the flexible surface layer 3 is 0.5-1.5 m.
In this embodiment, a grouting layer 8 is arranged between the flexible surface layer 3 and the side slope 1; the material of the grouting layer 8 adopts cement slurry or siliconizing slurry or alkali liquor.
In this embodiment, the pressing plate 4.1 and the bump 4.2 are integrally formed; the thickness of the pressing plate 4.1 is 2 cm-25 cm; the length of the lug 4.2 is adapted to the gap between the adjacent horizontal beams 5 and is 10 cm-30 cm; the width of the bump 4.2 is adapted to the gap between the adjacent oblique beams 6 and is 10 cm-30 cm; the thickness of the lug 4.2 is 5 cm-30 cm corresponding to the thickness of the horizontal beam 5 and the inclined beam 6.
In this embodiment, the prefabricated connecting piece 4 is made of reinforced concrete, steel, a polymer organic material or carbon fiber; wherein, the high-molecular organic material is high-strength resin or high-strength glass fiber.
In this embodiment, the materials of the horizontal beam 5 and the oblique beam 6 are matched with the material of the prefabricated connecting piece 4.
In the embodiment, the lap joint length of the transverse edge 4.1.1 and the horizontal beam 5 on the corresponding side is 5 cm-30 cm; the length of the lap joint of the vertical edge 4.1.2 and the oblique beam 6 on the corresponding side is 5 cm-30 cm.
In the embodiment, the vertical edges 4.1.2 and the oblique beams 6 are connected by adopting a buckle connection, a bolt connection or an embedded part welding connection; the transverse edge 4.1.1 and the horizontal beam 5 are connected by adopting a buckle connection, a bolt connection or an embedded part welding connection.
In this embodiment, the plurality of positioning and installing holes 7 are provided for adjusting the construction positioning error of the soil nails 2; when the number of the positioning installation pore passages 7 is more than one, the distance between the adjacent positioning installation pore passages 7 is 1 cm-6 cm.
Example 1, the construction method of the flexible surface layer fabricated soil nailing wall structure comprises the following steps.
Step one, excavating and repairing a side slope 1 of a foundation pit.
And step two, accurately positioning the position of the first layer of soil nails 2 and constructing the first layer of soil nails 2.
And step three, paving the flexible surface layer 3 from top to bottom.
And step four, arranging horizontal beams 5 and oblique beams 6 around each soil nail 2 in the first layer of soil nails 2.
And step five, mounting the prefabricated connecting piece 4 at the position of each soil nail 2 in the step four, and enabling the transverse edge 4.1.1 of the prefabricated connecting piece 4 to be pressed on the outer side surface of the horizontal beam 5, and enabling the vertical edge 4.1.2 of the prefabricated connecting piece 4 to be pressed on the outer side surface of the inclined beam 6.
And step six, locking the soil nails 2 by using an anchorage device 9, and respectively connecting the prefabricated connecting piece 4 with the horizontal beam 5 and the oblique beam 6.
And seventhly, excavating the earthwork of the next layer of foundation pit.
And step eight, repeating the process from the step one to the step seven until the construction of the side slope 1 of the foundation pit is finished.
In this embodiment, the horizontal beams, the oblique beams, and the prefabricated connecting members together form a prefabricated lattice beam structure.
Step one, excavating and repairing a side slope 1 of a foundation pit.
And step two, paving the flexible surface layer 3 from top to bottom.
And step three, arranging horizontal beams 5 and oblique beams 6 around each soil nail 2 in the first layer of soil nails 2.
Step four, mounting the prefabricated connecting piece 4 at the position of each soil nail 2 in the step four, and enabling the transverse edge 4.1.1 of the prefabricated connecting piece 4 to be pressed on the outer side face of the horizontal beam 5, and enabling the vertical edge 4.1.2 of the prefabricated connecting piece 4 to be pressed on the outer side face of the inclined beam 6.
And fifthly, accurately positioning the position of the first layer of soil nails 2 and constructing the first layer of soil nails 2.
And step six, locking the soil nails 2 by using an anchorage device 9, and respectively connecting the prefabricated connecting piece 4 with the horizontal beam 5 and the oblique beam 6.
And seventhly, excavating the earthwork of the next layer of foundation pit.
And step eight, repeating the process from the step one to the step seven until the construction of the side slope 1 of the foundation pit is finished.
In this embodiment, the horizontal beams, the oblique beams, and the prefabricated connecting members together form a prefabricated lattice beam structure.
The above embodiments are not exhaustive of the specific embodiments, and other embodiments are possible, and the above embodiments are intended to illustrate, but not limit the scope of the present invention, and all applications coming from the simple changes of the present invention fall within the scope of the present invention.
Claims (8)
1. A flexible surface layer assembly type soil nailing wall structure is arranged on a side slope (1) and comprises soil nails (2); the method is characterized in that: the device also comprises a flexible surface layer (3), a prefabricated connecting piece (4), a horizontal beam (5) and an oblique beam (6); the flexible surface layer (3) is fully paved on the side slope (1), and the top of the flexible surface layer (3) extends to the horizontal ground at the top of the side slope (1); the prefabricated connecting piece (4) comprises a pressing plate (4.1) and a convex block (4.2) arranged at the back of the pressing plate (4.1); the vertical section of the pressing plate (4.1) is in a cross shape and comprises a transverse edge (4.1.1) and a vertical edge (4.1.2); the convex block (4.2) is arranged at the cross intersection point of the pressing plate (4.1), and the vertical section of the convex block (4.2) is square or rectangular; the width of the lug (4.2) is not more than that of the vertical edge (4.1.2), and the thickness of the lug (4.2) is not more than that of the transverse edge (4.1.1); the prefabricated connecting pieces (4) are provided with a group and are arranged in a matrix shape; the convex block (4.2) of each prefabricated connecting piece (4) is vertically pressed on the flexible surface layer (3); at least one positioning and mounting pore channel (7) is arranged in the middle of the prefabricated connecting piece (4); the positioning and mounting hole channel (7) is vertical to the flexible surface layer (3); the horizontal beams (5) are provided with a group and are correspondingly arranged between the prefabricated connecting pieces (4) which are adjacent in the transverse direction; two ends of a transverse edge (4.1.1) of the pressing plate (4.1) are respectively pressed on the horizontal beams (5) at two sides, and the transverse edge (4.1.1) is connected with the horizontal beams (5); the inclined beams (6) are provided with a group and are correspondingly arranged between the obliquely adjacent prefabricated connecting pieces (4); two ends of a vertical edge (4.1.2) of the pressing plate (4.1) are respectively pressed on the oblique beams (6) at two sides, and the vertical edge (4.1.2) is connected with the oblique beams (6); the soil nails (2) are correspondingly arranged in the positioning and mounting hole channels (7) of the prefabricated connecting pieces (4) in a penetrating mode, the upper ends of the soil nails (2) are locked on the outer side face of the pressing plate (4.1) through anchors (9), and the lower ends of the soil nails (2) are anchored in soil bodies of the side slope (1).
2. The flexible surface layer fabricated soil nailing wall structure of claim 1, wherein: the flexible surface layer (3) is made of a geosynthetic material, a cement cloth or a waterproof coiled material; the thickness of the flexible surface layer (3) is 1 mm-30 mm; the width of the part, extending to the horizontal ground at the top of the side slope (1), of the top of the flexible surface layer (3) is 0.5-1.5 m.
3. The flexible surface layer fabricated soil nailing wall structure of claim 1, wherein: a grouting layer (8) is arranged between the flexible surface layer (3) and the side slope (1); the material of the grouting layer (8) adopts cement slurry or silicification slurry or alkali liquor.
4. The flexible surface layer fabricated soil nailing wall structure of claim 1, wherein: the pressing plate (4.1) and the lug (4.2) are integrally formed; the thickness of the pressing plate (4.1) is 2 cm-25 cm; the length of the convex block (4.2) is adapted to the gap between the adjacent horizontal beams (5) and is 10-30 cm; the width of the bump (4.2) is adapted to the gap between the adjacent oblique beams (6) and is 10-30 cm; the thickness of the convex block (4.2) is 5 cm-30 cm corresponding to the thickness of the horizontal beam (5) and the oblique beam (6).
5. The flexible surface layer fabricated soil nailing wall structure of claim 1, wherein: the prefabricated connecting piece (4) is made of reinforced concrete or steel or a high-molecular organic material or carbon fiber; wherein, the high-molecular organic material is high-strength resin or high-strength glass fiber.
6. The flexible surface layer fabricated soil nailing wall structure of claim 5, wherein: the materials of the horizontal beam (5) and the oblique beam (6) are matched with the material of the prefabricated connecting piece (4).
7. The flexible surface layer fabricated soil nailing wall structure of claim 1, wherein: the lap joint length of the transverse edge (4.1.1) and the horizontal beam (5) on the corresponding side is 5 cm-30 cm; the length of the lap joint of the vertical edge (4.1.2) and the oblique beam (6) on the corresponding side is 5 cm-30 cm.
8. The flexible surface layer fabricated soil nailing wall structure of claim 1, wherein: the vertical edges (4.1.2) are connected with the oblique beams (6) by adopting a buckle connection or a bolt connection or an embedded part welding connection; the transverse edges (4.1.1) are connected with the horizontal beam (5) by adopting a buckle connection or a bolt connection or an embedded part welding connection.
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| CN202020545415.8U CN212316940U (en) | 2020-04-14 | 2020-04-14 | Flexible surface layer assembled soil nailing wall structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529707A (en) * | 2021-08-10 | 2021-10-22 | 哈尔滨工业大学 | Umbrella-shaped light anchor rod, slope supporting structure and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529707A (en) * | 2021-08-10 | 2021-10-22 | 哈尔滨工业大学 | Umbrella-shaped light anchor rod, slope supporting structure and construction method thereof |
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