Wave absorbing lining structure for shield tunnel

Abstract

According to the wave absorbing lining structure for the shield tunnel, the primary supporting layer is sprayed on the surface of the inner wall of the tunnel, the primary supporting strength of the tunnel can be effectively enhanced, the resistance to deformation of surrounding rock is improved, and cracks on the inner wall of the tunnel are reduced. Secondly, the surrounding rock is tightly connected with the supporting structure through the anchor rods, the anchoring sections penetrate into the surrounding rock, the self-bearing capacity of the surrounding rock can be fully mobilized, and the overall stability of the tunnel is further improved. Moreover, the grouting layer between the corrugated steel plate group and the primary support layer not only enhances the structural integrity, but also plays a good role in buffering and absorbing waves, effectively reduces the impact of dynamic loads such as seismic waves on the tunnel, and ensures the safe operation of the tunnel in complex geological environments and earthquake disasters. In addition, through the clamping design of the bottom end of the corrugated steel plate set and the prefabricated inverted arch and the arch structure of the corrugated steel plate set, structural stress distribution is optimized, the tunnel structure is more stable and reliable, meanwhile, construction and installation are facilitated, the construction efficiency can be improved, the construction cost is reduced, and the service life of the tunnel is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to underground shield tunnel lining construction technical field especially is related to a wave absorbing lining structure for shield tunnel. BACKGROUND

[0002] In the field of shield tunnel engineering, with the continuous expansion of tunnel construction scale and the increasingly stringent requirements for tunnel stability and durability, the traditional tunnel support structure gradually exposes many limitations. In the process of construction and operation of the tunnel, it faces challenges such as deformation of surrounding rock, earthquake wave impact, groundwater seepage and other complex working conditions. The conventional support method is difficult to effectively coordinate the interaction between the tunnel structure and the surrounding rock, resulting in cracking, leakage and other problems of the tunnel lining under high stress or complex geological conditions, which seriously affects the safety and service life of the tunnel. At the same time, the wave absorbing and damping performance under the action of dynamic load such as earthquake is not considered, which cannot fully guarantee the structural integrity and operational safety of the tunnel in the event of an earthquake disaster. In addition, the construction efficiency of the traditional support structure is relatively low, and the process is complicated, which is not conducive to the rapid and efficient promotion of tunnel engineering construction. Therefore, it is urgent to develop a new wave absorbing lining structure for shield tunnel to overcome the defects of the prior art, improve the reliability, durability and wave absorbing and damping capacity of the tunnel support, and adapt to the high standard requirements of modern shield tunnel construction and operation. SUMMARY

[0003] The utility model is aimed at providing a wave absorbing lining structure for shield tunnel to improve the reliability, durability and wave absorbing and damping capacity of the tunnel support.

[0004] The utility model provides a wave absorbing lining structure for shield tunnel, which comprises an initial support layer, an anchor rod, a prefabricated inverted arch and an arched wave steel plate group, the initial support layer is sprayed on the surface of the inner wall of the tunnel, the anchoring section of the anchor rod is anchored in the surrounding rock of the tunnel, the anchor head of the anchor rod is arranged on the outer surface of the initial support layer, the wave steel plate group is filled with a grouting layer between the initial support layer, the inner side of the wave steel plate group is anchored and connected with the grouting layer, and the bottom end of the wave steel plate group is clamped on both sides of the prefabricated inverted arch.

[0005] Further, the wave steel plate group comprises a plurality of wave steel plates spliced with each other, the edge of each wave steel plate is provided with a connecting plate, and the connecting plates between every two adjacent wave steel plates are connected through bolts.

[0006] Further, the outer side of the connecting plate is provided with a sealing gasket.

[0007] Further, the two sides of the prefabricated inverted arch are symmetrically provided with a bayonet for clamping the wave steel plate group.

[0008] Further, an arched waterproof plate is arranged between the primary support layer and the grouting layer, and a plurality of spring water-permeable pipes are arranged along the length direction of the side of the waterproof plate close to the primary support layer.

[0009] Further, a drainage ditch and a pipeline ditch are arranged in the prefabricated inverted arch, drainage channels are symmetrically arranged on both sides of the drainage ditch, and the spring water-permeable pipes are communicated with the drainage channels.

[0010] Further, a support is fixedly arranged at the connection between every two groups of corrugated steel plates, the support protrudes towards the side close to the inner wall of the tunnel, and the support is embedded in the grouting layer.

[0011] Further, a rubber pad is arranged on the bottom surface of the support.

[0012] Further, a plurality of anchor bars are welded at the valleys of the side of the corrugated steel plate close to the grouting layer, and the length of the anchor bars is smaller than the length of the support.

[0013] Further, a concrete cushion layer is arranged at the bottom end of the prefabricated inverted arch.

[0014] The primary support layer is sprayed on the inner wall surface of the tunnel, which can effectively enhance the primary support strength of the tunnel, improve the resistance to deformation of the surrounding rock, and reduce the cracks on the inner wall of the tunnel. The anchor rod connects the surrounding rock and the support structure closely, the anchoring section penetrates into the interior of the surrounding rock, which can fully mobilize the self-bearing capacity of the surrounding rock and further improve the overall stability of the tunnel. The grouting layer between the corrugated steel plate group and the primary support layer not only enhances the overall structure, but also has good buffering and wave-absorbing effects, which can effectively reduce the impact of dynamic load such as earthquake wave on the tunnel, and ensure the safe operation of the tunnel in complex geological environment and earthquake disaster. In addition, the clamping design of the bottom end of the corrugated steel plate group and the prefabricated inverted arch and the arched structure thereof optimize the stress distribution of the structure, make the tunnel structure more stable and reliable, facilitate the construction and installation, improve the construction efficiency, reduce the construction cost, and prolong the service life of the tunnel. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0016] Figure 1 It is a construction structure diagram of the present application.

[0017] Figure 2For the utility model Figure 1 The structure enlarged view of A in the middle.

[0018] Figure 3 For the utility model the structure diagram of corrugated steel sheet.

[0019] Figure 4 For the utility model the connecting structure diagram of two adjacent corrugated steel sheet connecting place.

[0020] Mark explanation: 1 - initial support layer, 2 - corrugated steel sheet, 3 - anchor rod, 4 - grouting layer, 5 - anchor bar, 6 - support, 7 - prefabricated inverted arch, 8 - drainage ditch, 9 - pipeline ditch, 10 - drainage passage, 11 - concrete cushion, 12 - connecting plate. Specific implementation

[0021] The technical scheme of the utility model will be described below in conjunction with embodiments, obviously, the described embodiments are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the scope of the utility model protection.

[0022] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For the ordinary skill in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] Embodiment 1

[0025] As Figures 1-4 shown, the utility model provides a wave absorbing lining structure for shield tunnel, including initial support layer 1, anchor rod 3, prefabricated inverted arch 7 and corrugated steel sheet group of arch structure, initial support layer 1 is sprayed on the surface of tunnel inner wall, the anchoring section of anchor rod 3 is anchored in the surrounding rock inside tunnel, and the anchor head of anchor rod 3 is arranged on the outer surface of initial support layer 1, and the corrugated steel sheet group is filled with grouting layer 4 between initial support layer 1, and the concrete cushion 11 is arranged at the bottom end when prefabricated inverted arch 7 is assembled on site.

[0026] Corrugated steel sheet group includes a plurality of mutually spliced corrugated steel sheets 2, and the edge of each corrugated steel sheet 2 is provided with a connecting plate 12, and the connecting plate 12 between every two adjacent corrugated steel sheets 2 is connected through bolts. The corrugated steel material is Q235B, the amount of hot-dip galvanizing on the surface of the corrugated steel is not less than 600g / m 3 , and the bolts, nuts and washers are all galvanized components. After the installation of the corrugated steel sheet 2 group is completed, temporary support is arranged to ensure the stability of the overall structure during the pouring of concrete and prevent instability deformation.

[0027] The outer side of the connecting plate 12 is provided with a sealing gasket, and the inner and outer sides of the connected part are further sealed after being tightened. The corrugated steel sheet 2 group needs to reserve a grout outlet during installation, which is used for pouring the grouting layer 4. The grouting outlet is arranged at the middle position of the cross section on both sides and the top of the arch, and can be added as necessary to meet the concrete unloading height. The concrete used for the grouting layer 4 adopts self-compacting concrete, which can self-leveling to reach the dense state without vibration.

[0028] The two sides of the prefabricated inverted arch 7 are symmetrically provided with a card hole for clamping the corrugated steel sheet 2 group, and the bottom end of the corrugated steel sheet group is clamped in the card hole on both sides of the prefabricated inverted arch 7.

[0029] The arch-shaped waterproof plate is arranged between the initial support layer 1 and the grouting layer 4, a plurality of spring water permeable pipes are arranged on the side of the waterproof plate close to the initial support layer 1 along the length direction of the initial support layer 1, the spring water permeable pipes are arranged along the cross section circle and are spaced 6m apart, 5 rows of spring water permeable pipes are arranged along the longitudinal direction of the tunnel, cross communication devices are arranged at the horizontal and longitudinal junctions, a drainage ditch 8 and a pipeline ditch 9 are arranged in the prefabricated inverted arch 7, drainage channels 10 are symmetrically arranged in the prefabricated inverted arch 7 on both sides of the drainage ditch 8, and the spring water permeable pipes are finally communicated with the drainage channels 10 in the prefabricated inverted arch.

[0030] A support 6 is fixedly installed at the joint of each two groups of corrugated steel plates 2, and the support 6 protrudes towards the side close to the inner wall of the tunnel, so that the support 6 can be embedded in the grouting layer 4. The support 6 is arranged to facilitate the control of the installation position and to keep a certain distance from the waterproof plate. A rubber pad is arranged on the bottom surface of the support 6 to prevent the steel plate from damaging the waterproof plate. A plurality of anchor bars 5 are welded at the valleys of the side of the corrugated steel plate 2 close to the grouting layer 4 at intervals, so as to realize the anchoring connection between the inner side of the group of corrugated steel plates 2 and the grouting layer 4. The length of the anchor bar 5 is less than the length of the support 6. The anchor bar 5 is arranged to facilitate the connection of the corrugated steel plate 2 and the grouting layer 4 into a whole.

[0031] The construction procedure of the wave-absorbing lining structure is as follows:

[0032] ① Shield tunnel primary support and anchor rod 3 construction: common mortar anchor rod 3 is constructed according to the design position of the anchor rod 3, and a primary support layer 1 is formed by spraying concrete on the inner wall of the tunnel. When the surrounding rock condition is poor, a steel arch is arranged before spraying the concrete.

[0033] ② Precast inverted arch 7 installation and waterproof layer construction: the precast inverted arch 7 is assembled by mechanical lifting, and a 100mm-thick C20 concrete cushion layer 11 is arranged under the inverted arch. When a plurality of precast inverted arches 7 are spliced, water-swelling adhesive strips are arranged at the corresponding positions of the drainage ditch 8 and the pipeline ditch 9 to ensure the sealing and position correspondence between the drainage ditch 8 and the pipeline ditch 9. Waterproof plates are arranged on the surface of the primary support layer 1, and spring water permeable pipes are arranged under the waterproof plates. The spring water permeable pipes are arranged along the circumference of the section and are spaced 6m apart. Five rows of spring water permeable pipes are arranged along the longitudinal direction of the tunnel (one row at the top of the arch, two rows at the waist of the arch, and two rows at the foot of the arch). Cross communication devices are arranged at the intersection of the horizontal and vertical directions. The spring water permeable pipes are finally connected with the precast inverted arch drainage pipes.

[0034] ③ Main structure corrugated steel installation construction: the assembly sequence of the corrugated steel is from bottom to top, symmetrical splicing on both sides, and finally installing the top plate. The anchor bar 5 and the steel plate support 6 are welded before splicing. According to this cycle operation, a construction section is generally every 12m. Inner and outer side grouting pipes are arranged at the same time, connected at the grouting port, and the end plates on both sides are closed.

[0035] ④ Grouting layer 4 construction: temporary supports are arranged when the grouting layer 4 is poured, and the grouting port is closed after the pouring is completed.

[0036] ⑤ After the concrete reaches 75% of the design strength, the steel pipe frame is removed, and the next cycle is entered.

[0037] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wave-damping lining structure for a shield tunnel, characterized by, The corrugated steel plate group comprises an initial support layer, an anchor rod, a prefabricated inverted arch and an arch structure, the initial support layer is sprayed on the surface of the inner wall of the tunnel, the anchoring section of the anchor rod is anchored in the surrounding rock of the tunnel, the anchor head of the anchor rod is arranged on the outer surface of the initial support layer, the grouting layer is filled between the corrugated steel plate group and the initial support layer, the inner side of the corrugated steel plate group is anchored and connected with the grouting layer, the two sides of the prefabricated inverted arch are symmetrically provided with the bayonet for clamping the corrugated steel plate group, and the bottom end of the corrugated steel plate group is clamped on the two sides of the prefabricated inverted arch. The corrugated steel plate group comprises a plurality of corrugated steel plates spliced with each other, and the edge of each corrugated steel plate is provided with a connecting plate. The connecting portion of every two corrugated steel plate groups is fixedly provided with a support, the support protrudes towards the side close to the inner wall of the tunnel, and the support is embedded in the grouting layer. A plurality of anchor bars are welded at the valleys of the side of the corrugated steel plate close to the grouting layer, and the length of the anchor bar is less than the length of the support.

2. The wave-absorbing lining structure for a shield tunnel according to claim 1, characterized by, The outer side of the connecting plate is provided with a sealing gasket.

3. The wave-absorbing lining structure for a shield tunnel according to claim 1, characterized by, An arch-shaped waterproof plate is arranged between the initial support layer and the grouting layer, a plurality of spring water permeable pipes are arranged on the side of the waterproof plate close to the initial support layer and are arranged at intervals along the length direction of the waterproof plate.

4. The wave-absorbing lining structure for a shield tunnel according to claim 3, characterized by, The prefabricated inverted arch is internally provided with a drainage ditch and a pipeline ditch, the prefabricated inverted arch is internally provided with drainage channels on the two sides of the drainage ditch, and the spring water permeable pipe is in communication with the drainage channel.

5. The wave-absorbing lining structure for a shield tunnel according to claim 1, wherein The bottom surface of the support is provided with a rubber pad.

6. The wave-absorbing lining structure for a shield tunnel according to claim 1, wherein The bottom end of the prefabricated inverted arch is paved with a concrete cushion layer.

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