Tunnel inverted arch structure

Abstract

The utility model provides a tunnel inverted arch structure which comprises a corrugated steel plate layer, a secondary lining layer, a frame column layer and a pavement layer which are sequentially arranged from bottom to top, and the corrugated steel plate layer is provided with a grouting hole and an anchor rod hole for a system anchor rod to penetrate through. Foam concrete is injected into an interlayer space between the corrugated steel plate layer and the surrounding rock through the grouting holes to form a foam concrete layer, the system anchor rod comprises an anchoring end and a locking end which are oppositely arranged in the extending direction of the system anchor rod, the anchoring end penetrates through the anchor rod hole to be anchored into the surrounding rock, and the locking end is connected with the corrugated steel plate layer. The secondary lining layer is arranged on the inner wall of the corrugated steel plate layer, the bottom of the frame column layer is pre-buried in the secondary lining layer, and the pavement layer is laid on the top of the frame column layer. According to the novel inverted arch structure, particularly, a traditional inverted arch backfilling layer is arranged to be of a frame layer structure, the use amount of concrete can be greatly reduced, the safety and stability of a tunnel are guaranteed, meanwhile, the material cost and the construction cost are reduced, and economic benefits are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel technical field especially a tunnel inverted arch structure. BACKGROUND

[0002] At present, the tunnel inverted arch structure mainly comprises an inverted arch primary support, an inverted arch secondary lining, a backfill layer and a road surface layer, wherein the inverted arch primary support is a support structure immediately constructed after tunnel excavation, mainly comprising an anchor rod, a steel mesh and sprayed concrete, and is used for quickly closing an excavation face to prevent surrounding rock loosening and collapse. The main role of the inverted arch primary support is to further enhance the safety and stability of the tunnel. The backfill layer is located between the secondary lining and the road surface layer, and the main role of the backfill layer is to fill the gap generated during tunnel excavation, reduce ground subsidence, and simultaneously play a water-blocking role. The road surface layer directly bears the pressure of vehicle load and personnel walking, and the road surface layer is usually paved with materials such as asphalt concrete or cement concrete.

[0003] The inverted arch lining structure of the prior art has the problems of complex construction, long construction period and large amount of materials, especially the tunnel inverted arch backfill layer usually uses C15 concrete filling, and the number per meter is large, which can reach 8-10 m 3 / meter, and then a reinforced concrete road surface base layer is poured, and finally an asphalt layer is paved. This not only consumes a large amount of concrete, but also has a long construction period.

[0004] Therefore, it is necessary to provide a tunnel inverted arch structure to solve or at least alleviate the above-mentioned defects. SUMMARY

[0005] The main purpose of the utility model is to provide a tunnel inverted arch structure to solve the technical problems of large amount of materials and long construction period in the prior art inverted arch structure.

[0006] To achieve the above-mentioned purpose, the utility model provides a tunnel inverted arch structure, which comprises, from bottom to top, a corrugated steel plate layer, a secondary lining layer, a frame column layer and a road surface layer; wherein,

[0007] The corrugated steel plate layer is provided with a grouting hole and an anchor rod hole for the system anchor rod to penetrate, foam concrete is injected into the interlayer space between the corrugated steel plate layer and the surrounding rock through the grouting hole to form a foam concrete layer, the system anchor rod comprises an anchoring end and a locking end which are oppositely arranged along the extension direction of the system anchor rod, the anchoring end penetrates the anchor rod hole and is anchored into the surrounding rock, and the locking end is connected with the corrugated steel plate layer;

[0008] The secondary lining layer is arranged on the inner wall of the corrugated steel plate layer;

[0009] The bottom of the frame column layer is embedded in the secondary lining layer, and the road surface layer is paved on the top of the frame column layer.

[0010] Preferably, the corrugated steel plate layer comprises a corrugated steel plate body and two connecting plates connected to two ends of the corrugated steel plate body, and the corrugated steel plate body is in the shape of an inverted arch with an opening upward.

[0011] Preferably, the frame column layer comprises a cover plate and a plurality of spaced vertical columns, the lower end of each vertical column is embedded in the secondary lining layer, the cover plate and the vertical columns are integrally cast as a whole, and the cover plate is arranged on the top of the vertical columns.

[0012] Preferably, the plurality of vertical columns are arranged in a rectangular array, and the spacing distance between adjacent two vertical columns is 100*100 cm.

[0013] Preferably, each vertical column comprises a PVC vertical pipe and a first steel reinforcement cage, the cover plate comprises a PVC plate and a second steel reinforcement cage, the first steel reinforcement cage is arranged on the inner side of the PVC vertical pipe, the second steel reinforcement cage is arranged on the inner side of the PVC plate, the bottom of the PVC plate is formed with an annular butt joint groove matched with the PVC vertical pipe, the PVC plate is butt-jointed on the top of the PVC vertical pipe through the annular butt joint groove, the top of the PVC plate is reserved with a pouring hole corresponding to the PVC vertical pipe, the longitudinal main reinforcement of the first steel reinforcement cage extends upward to be connected with the second steel reinforcement cage, and the PVC vertical pipe and the PVC plate are surrounded to form a cavity which is filled with concrete by pouring concrete through the pouring hole.

[0014] Preferably, the pavement layer comprises a prefabricated pavement plate and an asphalt layer, the prefabricated pavement plate is arranged on the top of the cover plate, and the asphalt layer is arranged on the top of the prefabricated pavement plate.

[0015] Preferably, the center longitudinal drainage ditch arranged at the bottom center of the corrugated steel plate body is used for collecting seepage water of surrounding rock drained from the outer wall of the corrugated steel plate body, and the vertical drainage pipe assembly comprises a plurality of vertical drainage pipes arranged at intervals along the extension direction of the center longitudinal drainage ditch, the lower end of each vertical drainage pipe is communicated with the center longitudinal drainage ditch, and each vertical drainage pipe penetrates the corrugated steel plate body, the secondary lining layer and the space between the vertical columns in sequence upward.

[0016] Preferably, the pipe diameter of the vertical drainage pipe is set to be between 200 mm and 300 mm.

[0017] Preferably, the thickness of the prefabricated pavement plate is set to be between 15 cm and 25 cm, and the thickness of the asphalt layer is set to be between 8 cm and 10 cm.

[0018] Preferably, the width of the center longitudinal drainage ditch is set to be between 50 cm and 80 cm.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a tunnel inverted arch structure, including the corrugated steel sheet layer, secondary lining layer, frame column layer and road surface layer who sets gradually from below to above, the corrugated steel sheet layer is equipped with the grouting hole, the anchor rod hole for system anchor rod is used for going through, the foam concrete is injected into the interlayer space between the corrugated steel sheet layer and surrounding rock through the grouting hole and forms the foam concrete layer, the system anchor rod includes the anchoring end and locking end who sets up relatively along the self extension direction, the anchoring end goes through the anchor rod hole and anchors into the inside of surrounding rock, the locking end is connected with the corrugated steel sheet layer, the secondary lining layer is located in the inner wall of the corrugated steel sheet layer, the bottom of frame column layer is embedded in the secondary lining layer, and the road surface layer is laid on the top of frame column layer.

[0021] The utility model provides a kind of new inverted arch structure, compared with prior art inverted arch structure form, it is simplified on structure composition form, the corrugated steel sheet layer at bottom can be assembled and is constructed, not only can be used as initial support, also can utilize the water-proof characteristic of corrugated steel sheet layer itself with good waterproof performance, frame column layer can realize quick cast-in-place construction, cast-in-place in traditional backfill layer structure form, can greatly shorten construction period, reduce engineering material quantity, while guaranteeing tunnel safety and stability, also reduce material cost and construction cost, improve economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structure shown in these drawings without creative labor for those skilled in the art.

[0023] Figure 1 It is the application scenario schematic diagram of the overall structure in an embodiment of the utility model;

[0024] Figure 2 It is the inverted arch drainage schematic diagram in an embodiment of the utility model;

[0025] Figure 3 It is the structure schematic diagram of corrugated steel plate main body in an embodiment of the utility model;

[0026] Figure 4 It is the structure schematic diagram of frame column layer in an embodiment of the utility model;

[0027] Figure 5 It is the plane schematic diagram of PVC plate in an embodiment of the utility model;

[0028] Figure 6 Structure diagram of the stand column in an embodiment of the present application;

[0029] Figure 7 Sectional view diagram of the PVC plate in an embodiment of the present application.

[0030] The purposes, functional features and advantages of the present application will be further described in combination with embodiments and with reference to the drawings.

[0031] Explanation of reference numerals:

[0032] 10, corrugated steel plate layer; 110, corrugated steel plate body; 120, connecting plate; 20, secondary lining layer; 30, frame column layer; 310, cover plate; 311, PVC plate; 312, annular butt joint groove; 313, pouring hole; 320, stand column; 321, PVC vertical pipe; 322, longitudinal main reinforcement; 40, pavement layer; 50, central longitudinal drainage ditch; 60, vertical drainage pipe assembly; DETAILED DESCRIPTION

[0033] It should be understood that the specific embodiments described herein merely exemplify the present application and are not intended to limit the present application.

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as described in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0036] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0037] Please refer to the attached Figures 1 to 7 The utility model provides a tunnel inverted arch structure in one embodiment, comprising from bottom to top wave corrugated steel sheet layer 10, secondary lining layer 20, frame column layer 30 and road surface layer 40 are set gradually, wherein,

[0038] Wave corrugated steel sheet layer 10 is provided with grouting hole (not shown in drawing), anchor rod hole (not shown in drawing) for system anchor rod to pass through, foam concrete is injected into the interlayer space between wave corrugated steel sheet layer 10 and surrounding rock through grouting hole to form foam concrete layer (not shown in drawing), and system anchor rod (not shown in drawing) comprises anchoring end and locking end oppositely arranged along the extension direction of itself, the anchoring end is anchored into the interior of surrounding rock through the anchor rod hole, and the locking end is connected with wave corrugated steel sheet layer 10.

[0039] Secondary lining layer 20 is arranged on the inner wall of wave corrugated steel sheet layer 10, and can adopt jet construction or mould construction.

[0040] The bottom of frame column layer 30 is embedded in secondary lining layer 20, and road surface layer 40 is laid on the top of frame column layer 30.

[0041] Specifically, wave corrugated steel sheet layer 10 is the bottom support structure of the tunnel, provides preliminary strength and stability, foam concrete is injected into the interlayer space between wave corrugated steel sheet layer 10 and surrounding rock through grouting hole to form foam concrete layer, fills the gap, can effectively release the surrounding rock pressure, and increase the stability and carrying capacity of the overall structure, anchor rod hole is used for installing system anchor rod, further enhances the stability of the structure, the anchoring end of system anchor rod is anchored into the interior of surrounding rock, and the locking end is connected with wave corrugated steel sheet layer 10, can effectively utilize surrounding rock to enhance the overall structural stability, and the bottom of frame column layer 30 is embedded in secondary lining layer 20, and the top supports road surface layer 40, forming the longitudinal support structure of the tunnel.

[0042] The utility model enhances the stability and carrying capacity of the tunnel inverted arch structure through the joint action of wave corrugated steel sheet layer 10, foam concrete layer, system anchor rod and secondary lining layer 20, improves the waterproof performance and durability of the structure through the combination of wave corrugated steel sheet layer 10 and secondary lining layer 20 and the filling of foam concrete, shortens the construction period and reduces the engineering material quantity through the prefabrication and on-site construction of wave corrugated steel sheet layer 10 and frame column layer 30 and the grouting construction of foam concrete, greatly simplifies the construction process and shortens the construction period.In addition, the utility model sets the traditional inverted arch backfill layer into the frame layer structure, can greatly reduce the concrete quantity, guarantees the safety and stability of the tunnel, also reduces the material cost and construction cost, and improves the economic benefit.

[0043] As a preferred embodiment, the corrugated steel plate layer 10 comprises a corrugated steel plate body 110 and two connecting plates 120 connected to both ends of the corrugated steel plate body 110, and the corrugated steel plate body 110 is in the shape of an inverted arch with the opening facing upwards. The design of the connecting plate 120 enables the corrugated steel plate body 110 to be conveniently connected to other structural layers, such as the arch wall lining structure, facilitating connection and increasing the overall stability and safety of the tunnel.

[0044] Preferably, the frame column layer 30 comprises a cover plate 310 and a plurality of spaced apart stand columns 320, the lower end of each stand column 320 is embedded in the secondary lining layer 20, the cover plate 310 and the stand columns 320 are integrally cast as a whole, and the cover plate 310 is arranged on the top of the stand columns 320.

[0045] Specifically, the frame column layer 30 forms a solid support system through the integral casting of the plurality of stand columns 320 and the cover plate 310, not only enhancing the longitudinal support capacity of the tunnel inverted arch, but also helping to resist the load from the side wall and the top of the tunnel, thereby improving the stability of the entire tunnel structure. At the same time, the frame column layer 30 adopts the form of a plurality of stand columns 320 arranged at intervals, which can change the existing inverted arch backfill layer form into a frame structure, while ensuring the safety and stability of the tunnel, greatly reducing the amount of concrete, thereby reducing the material cost and construction cost, and improving the economic benefit.

[0046] Preferably, the plurality of stand columns 320 are arranged in a rectangular array, and the interval distance between the adjacent two stand columns 320 is set to 100*100cm. By setting the interval distance between the adjacent two stand columns 320 to 100cm*100cm, it can be ensured that the load is evenly distributed between the frame column layer 30, which helps to reduce the risk of structural damage caused by load concentration and improve the carrying capacity of the tunnel. It can be understood that in other embodiments, those skilled in the art can also set the interval distance between the stand columns 320 to other values according to actual needs.

[0047] Preferably, each of the columns 320 comprises a PVC vertical pipe 321 and a first reinforcement cage (not shown in the figure), the cover plate 310 comprises a PVC plate 311 and a second reinforcement cage (not shown in the figure), the first reinforcement cage is arranged inside the PVC vertical pipe 321, the second reinforcement cage is arranged inside the PVC plate 311, the bottom of the PVC plate 311 is formed with an annular butt joint groove 312 matched with the PVC vertical pipe 321, the PVC plate 311 is butt-jointed at the top of the PVC vertical pipe 321 through the annular butt joint groove 312, the top of the PVC plate 311 is reserved with a pouring hole 313 corresponding to the PVC vertical pipe 321, the longitudinal main reinforcement 322 of the first reinforcement cage extends upward to be connected with the second reinforcement cage, and concrete is poured through the pouring hole 313 to fill the cavity formed by the PVC vertical pipe 321 and the PVC plate 311.

[0048] Specifically, the first reinforcement cage, as the main load-bearing part of the column 320, provides high strength and rigidity. The longitudinal main reinforcement 322 is connected with the second reinforcement cage to form a continuous reinforcement cage, which further enhances the integrity and synergistic working capacity between the column 320 and the cover plate 310, thereby improving the load-bearing capacity of the frame column layer 30. It is worth noting that the PVC vertical pipe 321, as the outer layer of the column 320, has certain corrosion resistance, waterproofness and durability, which can protect the internal reinforced concrete structure from the erosion of the external environment and prolong the service life of the column 320. At the same time, the PVC vertical pipe 321 can be used as a formwork for concrete pouring, realizing the combination of permanent and temporary use. Similarly, the PVC plate 311 can also be used as a formwork for upper pouring, and the construction personnel can first construct the PVC vertical pipe 321, the first reinforcement cage, the PVC plate 311 and the second reinforcement cage, and then perform on-site concrete casting to realize overall pouring and improve construction efficiency and quality.

[0049] Further, the road surface layer 40 comprises a precast road surface plate and an asphalt layer, the precast road surface plate is laid on the top of the cover plate 310, and the asphalt layer is laid on the top of the precast road surface plate.

[0050] The precast road surface plate is produced in a factory, which can realize standardized and large-scale production, greatly improving production efficiency. The precast road surface plate can be quickly laid, reducing on-site construction time and labor cost. The asphalt layer, as a surface layer, can be laid after the precast road surface plate is laid, further shortening the construction period.

[0051] As a preferred embodiment, a central longitudinal drainage ditch 50 and a vertical drainage pipe assembly 60 are further arranged at the center of the bottom of the corrugated steel plate body 110, the central longitudinal drainage ditch 50 is used for collecting the seepage water of the surrounding rock drained from the outer wall of the corrugated steel plate body 110, and the vertical drainage pipe assembly 60 comprises a plurality of vertical drainage pipes arranged at intervals along the extension direction of the central longitudinal drainage ditch 50, the lower end of each vertical drainage pipe is communicated with the central longitudinal drainage ditch 50, and each vertical drainage pipe penetrates into the interval space between the columns 320 in sequence from the corrugated steel plate body 110, the secondary lining layer 20 and upward.

[0052] Specifically, the corrugated steel plate layer 10 is used as the initial support, and the tunnel is wrapped in the corrugated steel plate layer 10, and the corrugated steel plate layer 10 itself is water-proof, so that the water-proof effect is good. The foam concrete is backfilled on the outer side of the corrugated steel plate layer 10, which can be used as a buffer layer and provide a drainage channel by using the water seepage property of the foam concrete, so that the underground water seeps along the foam concrete on the outer surface of the corrugated steel plate layer 10 to the central longitudinal drainage ditch 50 at the bottom of the arch, a part of the underground water can be discharged from the original underground drainage channel through the cracks of the surrounding rock, and the excess underground water can be discharged from the central longitudinal drainage ditch 50 at the bottom of the arch to the outside of the tunnel.

[0053] In particular, when the underground water level rises sharply in the rain season, the central longitudinal drainage ditch 50 at the bottom of the arch cannot meet the drainage requirement, and the excess underground water can be introduced into the tunnel through the vertical drainage pipe assembly 60, so that the underground water is discharged from the tunnel to the outside of the tunnel by fully utilizing the interval space of the column 320 unit. In this way, the underground water resource can be protected to restore the original drainage channel, and the safety of the tunnel structure can be protected when the underground water level rises sharply.

[0054] Preferably, the pipe diameter of the vertical drainage pipe is set to be between 200mm and 300mm.

[0055] Preferably, the thickness of the prefabricated pavement slab is set to be between 15cm and 25cm, and the thickness of the asphalt layer is set to be between 8cm and 10cm.

[0056] Preferably, the width of the central longitudinal drainage ditch 50 is set to be between 50cm and 80cm.

[0057] The above is only a preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation by using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. A tunnel invert structure, characterized by, The corrugated steel plate layer, the secondary lining layer, the frame column layer and the pavement layer are sequentially arranged from bottom to top. The corrugated steel plate layer is provided with grouting holes and anchor rod holes for system anchor rods, foam concrete is injected into the space between the corrugated steel plate layer and surrounding rock through the grouting holes to form a foam concrete layer, and the system anchor rod comprises an anchoring end and a locking end which are oppositely arranged along the extending direction of the system anchor rod, the anchoring end penetrates through the anchor rod hole and is anchored into the surrounding rock, and the locking end is connected with the corrugated steel plate layer. The secondary lining layer is arranged on the inner wall of the corrugated steel plate layer. The bottom of the frame column layer is embedded in the secondary lining layer, and the pavement layer is arranged on the top of the frame column layer.

2. The tunnel invert structure of claim 1, wherein, The corrugated steel plate layer comprises a corrugated steel plate body and two connecting plates connected to the two ends of the corrugated steel plate body, and the corrugated steel plate body is in the shape of an inverted arch with an opening facing upward.

3. The tunnel invert structure of claim 1, wherein, The frame column layer comprises a cover plate and a plurality of vertically arranged columns, the lower end of each column is embedded in the secondary lining layer, the cover plate and the columns are integrally cast, and the cover plate is arranged on the top of the columns.

4. The tunnel invert structure of claim 3, wherein, The plurality of columns are arranged in a rectangular array, and the distance between adjacent two columns is 100*100 cm.

5. The tunnel invert structure of claim 3, wherein, Each column comprises a PVC vertical pipe and a first steel reinforcement cage, the cover plate comprises a PVC plate and a second steel reinforcement cage, the first steel reinforcement cage is arranged on the inner side of the PVC vertical pipe, the second steel reinforcement cage is arranged on the inner side of the PVC plate, the bottom of the PVC plate is provided with an annular butt joint groove matched with the PVC vertical pipe, the PVC plate is butt-jointed on the top of the PVC vertical pipe through the annular butt joint groove, the top of the PVC plate is reserved with a pouring hole corresponding to the PVC vertical pipe, the longitudinal main reinforcement of the first steel reinforcement cage extends upward to be connected with the second steel reinforcement cage, and the PVC vertical pipe and the PVC plate are filled with concrete in the cavity formed by pouring concrete through the pouring hole.

6. The tunnel invert structure of claim 3, wherein, The pavement layer comprises a prefabricated pavement plate and an asphalt layer, the prefabricated pavement plate is arranged on the top of the cover plate, and the asphalt layer is arranged on the top of the prefabricated pavement plate.

7. The tunnel invert structure of claim 3, wherein, A central longitudinal drainage ditch and a vertical drainage pipe assembly are arranged at the central position of the bottom of the corrugated steel plate body, the central longitudinal drainage ditch is used for collecting the seepage water of the surrounding rock drained from the outer wall of the corrugated steel plate body, and the vertical drainage pipe assembly comprises a plurality of vertical drainage pipes which are arranged at intervals along the extending direction of the central longitudinal drainage ditch, the lower end of each vertical drainage pipe is communicated with the central longitudinal drainage ditch, and each vertical drainage pipe penetrates through the corrugated steel plate body and the secondary lining layer into the space between the columns in sequence.

8. The tunnel invert structure of claim 7, wherein, The diameter of the vertical drainage pipe is arranged to be between 200 mm and 300 mm.

9. The tunnel invert structure of claim 6, wherein, The thickness of the prefabricated pavement plate is arranged to be between 15 cm and 25 cm, and the thickness of the asphalt layer is arranged to be between 8 cm and 10 cm.

10. The tunnel invert structure of claim 7, wherein, The width of the central longitudinal drainage ditch is arranged to be between 50 cm and 80 cm.

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