A tunnel assembled inverted arch prefabricated structure convenient to disassemble

Abstract

The application relates to a detachable tunnel assembled inverted arch prefabricated structure, which is longitudinally sequentially spliced into a tunnel inverted arch structure along a line direction and comprises an arch wall cast-in-place secondary lining and a tunnel pavement. The assembled inverted arch prefabricated structure further comprises an inverted arch supporting prefabricated component, the inverted arch supporting prefabricated component comprises a bottom supporting piece and vertically-crossed reinforcing plates, communication pipes, electrical pipes and water supply and drainage pipes are respectively penetrated into the gaps between the adjacent reinforcing plates, and the reinforcing plate arrangement area is filled with a first pouring layer; a joint is arranged at the connecting position of the bottom supporting piece and the arch wall cast-in-place secondary lining, the upper surface of the first pouring layer and the tunnel pavement are provided with fine adjustment components, and the two groups of fine adjustment components are arranged side by side on the lower surface of the tunnel pavement. The application can realize on-site rapid installation and is favorable for the safety of the tunnel structure. The tunnel assembled inverted arch has small interference to the construction in the hole, the inverted arch trestle can be cancelled or optimized, and the tunnel construction progress is favorable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnels and underground engineering, and particularly relates to a tunnel assembled inverted arch prefabricated structure convenient to disassemble. BACKGROUND

[0002] At present, the drill and blast method is still the main construction method for mountain tunnel construction, and the inverted arch basically adopts a cast-in-place structure. The assembled inverted arch construction is applied in the tunnel constructed by the TBM method. Overall, the proportion of tunnels using the assembled inverted arch is still very low. Due to the influence of factors such as the construction conditions on site, external environment and construction personnel during the construction process of the cast-in-place structure, some tunnels have diseases such as inverted arch deformation, cracking, upward bulging and spewing of mud, which causes high maintenance cost during operation and even affects train operation in serious cases. Through investigation, it is found that the thickness is uneven during the construction of the inverted arch, the concrete pouring is mixed with sundries, and the construction joint quality defects seriously affect the quality of the inverted arch. Therefore, it is necessary to study a new type of inverted arch structure with more reliable quality.

[0003] Among them, the inverted arch is a reverse arch structure arranged at the bottom of the tunnel to improve the stress condition of the upper support structure, and is one of the main components of the tunnel structure, which is commonly explained as an arch that is upward

[0004] In the prior art, the assembled structure has the characteristics of factory production, standardized production scheme, reduction of construction pollution, improvement of working environment, reduction of tunnel hole workload, reduction of on-site construction labor cost, more reliable quality and the like, is an important measure of green construction advocated by the state, and is also a development direction of tunnel construction technology in the future. At present, the assembled structure has been well applied in some construction fields. With the improvement of the tunnel construction technology and the equipment manufacturing level in China, the external conditions for the tunnel to adopt the assembled inverted arch have been met. Under the development trend of tunnel construction mechanization and intelligentization, the industrialization of the tunnel using the assembled structure will also be a direction of tunnel construction development. SUMMARY

[0005] The purpose of the present application is to provide a tunnel assembled inverted arch prefabricated structure convenient to disassemble, which can optimize the form of the inverted arch trestle in the tunnel, even cancel the inverted arch trestle, and reduce the tunnel construction process.

[0006] The technical scheme of the present application is:

[0007] A tunnel assembled inverted arch prefabricated structure convenient to disassemble, the prefabricated structure is longitudinally sequentially spliced along the line direction to form a tunnel inverted arch structure, comprising an arch wall cast-in-place secondary lining and a tunnel pavement, the assembled inverted arch prefabricated structure further comprises an inverted arch support prefabricated assembly, the inverted arch support prefabricated assembly comprises a bottom support member and vertically intersecting arranged reinforcing plates, a communication pipe penetrating, an electrical pipe penetrating and a water supply and drainage pipe penetrating are respectively penetrated in the gap between adjacent reinforcing plates, and the reinforcing plate arrangement area is filled with a first pouring layer;

[0008] A joint is arranged at the connection between the bottom support member and the arch wall cast-in-place secondary lining, the upper surface of the first pouring layer and the tunnel pavement are provided with a fine adjustment assembly, the fine adjustment assembly is provided with at least six groups, and each adjacent two groups of the fine adjustment assembly are arranged side by side on the lower surface of the tunnel pavement.

[0009] Preferably, the arch wall cast-in-place secondary lining comprises a tunnel primary support steel frame and a second pouring layer, the second pouring layer is cast in the tunnel primary support steel frame, and the lower end of the arch wall cast-in-place secondary lining is connected to the bottom inverted arch support prefabricated assembly in a ring through the joint.

[0010] Preferably, the communication pipe penetrating, the electrical pipe penetrating and the water supply and drainage pipe penetrating are all arranged in the first pouring layer.

[0011] Preferably, a mortise and tenon member is arranged in the joint, the mortise and tenon member comprises a tenon or a groove, the tenon and the groove are detachably inserted and fixed, the tenon is arranged on the side of the tunnel primary support steel frame close to the joint, and the groove is arranged on the side of the bottom support member close to the joint.

[0012] Preferably, the fine adjustment assembly comprises an upper connecting member and a lower supporting member, the upper connecting member comprises a backing plate, three groups of supporting columns and a top plate, the top ends of the three groups of supporting columns are fixed and equidistantly arrayed on the lower surface of the top plate, the backing plate is fixedly installed at the lower end of the supporting column, and a first supporting plate is fixedly connected between two groups of the backing plates.

[0013] Preferably, the lower supporting member also comprises a backing plate and three groups of supporting columns, the three groups of supporting columns are fixedly connected to the lower surface of the backing plate, and a second supporting plate is connected between the backing plates in adjacent two groups of the lower supporting members, and a gap is arranged between the first supporting plate and the second supporting plate.

[0014] Preferably, the first supporting plate and the second supporting plate are internally threaded and penetratingly connected with a double-end screw, the double-end screw comprises a left-handed external thread and a right-handed external thread, the left-handed external thread and the right-handed external thread are respectively matched with the threaded holes arranged in the first supporting plate and the second supporting plate, and lock nuts are arranged on the positions of the double-end screw on the surfaces of the first supporting plate and the second supporting plate.

[0015] Preferably, an end plate is arranged at each end of the bottom support member, and an inspection hole is arranged in the end plate.

[0016] Preferably, the tunnel surface is provided with a drainage channel, and the drainage channel is filled with a steel mesh ring, the steel mesh ring is arranged in an equidistant array, and the outer diameter of the drainage channel is greater than the height of the tunnel surface. Technical effects and advantages of the present application:

[0017] 1. The inverted arch precast block structure can be produced and maintained in a factory, ensuring the thickness and shape of the structure design, and the quality is controllable;

[0018] 2. The inverted arch precast block can be quickly installed on site and put into use soon, the tunnel is closed early, which is conducive to the safety of the tunnel structure, reduces the workload and labor intensity in the hole, and improves the mechanization degree of tunnel construction. The tunnel assembly inverted arch has little interference with the construction in the hole, and the inverted arch trestle can be cancelled or optimized, which is conducive to the construction progress of the tunnel;

[0019] 3. The tunnel water ditch on both sides can be combined with the inverted arch block to optimize the tunnel section; the inverted arch precast block is implemented together with the inverted arch filling, the structure form and stress are more reasonable, high-grade concrete is used, the structure size is optimized, and the material consumption is reduced;

[0020] 4. The assembly inverted arch construction can optimize the form of the inverted arch trestle in the tunnel, and even cancel the inverted arch trestle to reduce the construction process of the tunnel;

[0021] 5. The assembly inverted arch construction improves the mechanization, informatization and intelligent construction level of the tunnel;

[0022] 6. During on-site installation, the support height of the required fine-tuning assembly is adjusted according to the installation requirements of the tunnel surface, and it is fixed between the upper surface of the first pouring layer and the lower surface of the tunnel surface, which simultaneously reduces the workload and labor intensity in the hole. BRIEF DESCRIPTION OF DRAWINGS

[0023] 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 description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the detachable tunnel assembly inverted arch precast structure of the present application;

[0025] Figure 2 It is a schematic diagram of the enlarged structure of part A in the present application; Figure 1

[0026] Figure 3 ​It is a three-dimensional structure schematic diagram of the cast-in-situ secondary lining of the arch wall of the application;

[0027] Figure 4 It is a three-dimensional sectional structure schematic diagram of the cast-in-situ secondary lining of the arch wall of the application;

[0028] Figure 5 It is a three-dimensional structure schematic diagram of the fine adjustment assembly of the application;

[0029] Figure 6 It is a three-dimensional structure schematic diagram of the mortise and tenon piece of the application.

[0030] Explanation of reference signs:

[0031] 1, inverted arch support prefabricated assembly; 101, bottom support piece; 102, reinforcing plate; 103, communication pipe;

[0032] 104, electrical pipe; 105, water supply and drainage pipe; 106, first pouring layer; 107, sealing plate; 108, manhole; 2, cast-in-situ secondary lining of arch wall; 201, tunnel initial support steel frame; 202, second pouring layer;

[0033] 3, joint; 4, tunnel pavement; 401, drainage channel; 402, steel mesh ring; 5, fine adjustment assembly; 6, upper connecting piece; 601, backing plate; 602, support column; 603, top plate; 604, first support plate; 7, lower support piece; 701, second support plate; 8, double-headed screw rod; 9, locking nut; 10, 1001, tenon;

[0034] 1002, groove. DETAILED DESCRIPTION

[0035] The technical solutions of the application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0036] In the description of the application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms “first”, “second”, “third” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] like Figures 1-6 As shown, a prefabricated invert arch structure for easy disassembly is provided. The prefabricated structure is assembled longitudinally along the tunnel route to form the tunnel invert arch structure, including a cast-in-place secondary lining 2 for the arch wall and a tunnel pavement 4. The prefabricated invert arch structure also includes an invert arch support prefabricated component 1. The invert arch support prefabricated component 1 includes a bottom support 101 and vertically arranged reinforcing plates 102. Communication conduits 103, electrical conduits 104, and water supply / drainage conduits 104 pass through the gaps between adjacent reinforcing plates 102. Pipe 105, the area where the reinforcing plate 102 is arranged is filled with a first pouring layer 106, the communication conduit 103, the electrical conduit 104 and the water supply and drainage conduit 105 are all set in the first pouring layer 106, the bottom support 101 is provided with sealing plates 107 at both ends, and the sealing plates 107 are provided with inspection holes 108. The bottom support 101 and the vertically arranged reinforcing plates 102 are set to improve the strength of the entire invert arch supporting the prefabricated components, ensure the stability of the foundation and provide the highest possible support force.

[0040] like Figure 1 As shown, a joint 3 is provided at the connection between the bottom support 101 and the cast-in-place secondary lining 2 of the arch wall. The cast-in-place secondary lining 2 of the arch wall includes the tunnel initial support steel frame 201 and the second pouring layer 202. The second pouring layer 202 is cast in place within the tunnel initial support steel frame 201. The lower end of the cast-in-place secondary lining 2 of the arch wall is connected to the bottom invert arch support prefabricated component 1 through the joint 3 to form a ring, making the tunnel invert arch more evenly stressed and less prone to deformation, thereby preventing tunnel cracking. Since the tunnel invert arch is spliced ​​from prefabricated blocks (tunnel initial support steel frame 201) with an arc-shaped cross section, this not only facilitates the batch prefabrication of prefabricated blocks in the factory, but also facilitates transportation and installation. Each prefabricated block can be transported to the construction site for on-site installation.

[0041] like Figure 6As shown, a tenon and mortise joint 10 is provided in the joint 3. The tenon and mortise joint 10 includes a tenon 1001 or a groove 1002. The tenon 1001 and the groove 1002 are detachably inserted and fixed. The tenon 1001 is set on the side of the tunnel initial support steel frame 201 near the joint 3, and the groove 1002 is opened on the side of the bottom support 101 near the joint 3. By using the tenon 1001 and the groove 1002, the installation of the cast-in-place secondary lining 2 of the arch wall is quick and easy, thereby enabling the rapid construction of the tunnel invert arch, reducing the labor intensity of workers, improving construction efficiency and ensuring construction quality.

[0042] like Figure 1 and Figure 2 As shown, a drainage channel 401 is provided inside the tunnel pavement 4. The drainage channel 401 is filled with wire mesh rings 402. The wire mesh rings 402 are arranged in an equally spaced array. By adding a separately formed tunnel pavement 4, a cylindrical drainage channel 401 is opened inside the tunnel pavement 4, and wire mesh rings 402 are set inside the drainage channel 401. This improves the bearing capacity of the entire drainage channel 401 while ensuring the construction cost is controlled. Moreover, the outer diameter of the drainage channel 401 is greater than the height of the tunnel pavement 4. The above arrangement can increase the friction of the tunnel pavement 4 and ensure the safety of tunnel travel.

[0043] like Figure 1 and Figure 5As shown, fine-tuning components 5 are provided on the upper surface of the first pouring layer 106 and the tunnel surface 4. At least six sets of fine-tuning components 5 are provided, with each pair of adjacent sets arranged side-by-side on the lower surface of the tunnel surface 4. Each fine-tuning component 5 includes an upper connector 6 and a lower support 7. The upper connector 6 includes a pad 601, three sets of support columns 602, and a top plate 603. The tops of the three sets of support columns 602 are all fixed and equidistantly arrayed on the lower surface of the top plate 603. The pad 601 is fixedly installed at the lower end of the support columns 602, and the two sets of pads 601 are fixedly connected. The lower support member 7 is fixedly connected to the first support plate 604. It also includes a pad 601 and three sets of support columns 602. The three sets of support columns 602 are fixedly connected to the lower surface of the pad 601. A second support plate 701 is connected between the pads 601 in two adjacent sets of the lower support member 7. A gap is provided between the first support plate 604 and the second support plate 701. During on-site installation, the support height of the required fine-tuning component 5 is adjusted according to the installation requirements of the tunnel pavement 4, and it is fixed between the upper surface of the first pouring layer 106 and the lower surface of the tunnel pavement 4. The first support plate 604 and the second support plate 701 are internally threaded and connected to a double-ended screw 8. The double-ended screw 8 includes a left-hand external thread and a right-hand external thread. The left-hand external thread and the right-hand external thread are respectively matched with threaded holes opened in the first support plate 604 and the second support plate 701. Locking nuts 9 are respectively provided on the surface of the double-ended screw 8 at the positions of the first support plate 604 and the second support plate 701. By rotating the locking nuts 9 at the positions of the first support plate 604 and the second support plate 701 using the double-ended screw 8, the first support plate 604 can be raised and the second support plate 701 can be lowered, thereby changing the gap between the first support plate 604 and the second support plate 701.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0045] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A prefabricated tunnel invert arch structure that is easy to disassemble, wherein the prefabricated structure is assembled longitudinally along the track direction to form a tunnel invert arch structure, including cast-in-place secondary lining of the arch wall (2) and tunnel pavement (4), characterized in that: The prefabricated invert arch structure also includes an invert arch support prefabricated component (1), which includes a bottom support (101) and vertically arranged reinforcing plates (102). Communication conduits (103), electrical conduits (104) and water supply and drainage conduits (105) pass through the gaps between adjacent reinforcing plates (102). The area where the reinforcing plates (102) are arranged is filled with a first pouring layer (106). A drainage channel (401) is provided inside the tunnel surface (4), and the drainage channel (401) is filled with wire mesh rings (402). The wire mesh rings (402) are arranged in an equally spaced array, and the outer diameter of the drainage channel (401) is greater than the height of the tunnel surface (4). A joint (3) is provided at the connection between the bottom support (101) and the cast-in-place secondary lining (2) of the arch wall. Fine-tuning components (5) are provided on the upper surface of the first pouring layer (106) and the tunnel surface (4). At least 6 sets of fine-tuning components (5) are provided, and each pair of adjacent sets of fine-tuning components (5) are arranged side by side on the lower surface of the tunnel surface (4). The fine-tuning component (5) includes an upper connector (6) and a lower support component (7). The upper connector (6) includes a pad (601), three sets of support columns (602), and a top plate (603). The top ends of the three sets of support columns (602) are fixed and equidistantly arrayed on the lower surface of the top plate (603). The pad (601) is fixedly installed on the lower end of the support column (602). A first support plate (604) is fixedly connected between two sets of pads (601). The lower support component (7) also includes a pad (601) and three sets of support columns (602). The three sets of support columns (602) are fixedly connected to the lower surface of the pad (601). A second support plate (701) is connected between the pads (601) in two adjacent sets of lower support components (7). A gap is provided between the first support plate (604) and the second support plate (701). The first support plate (604) and the second support plate (701) are internally threaded and connected to a double-ended screw (8). The double-ended screw (8) includes a left-hand external thread and a right-hand external thread. The left-hand external thread and the right-hand external thread are respectively matched with threaded holes opened in the first support plate (604) and the second support plate (701). Locking nuts (9) are respectively provided on the surface of the double-ended screw (8) at the positions of the first support plate (604) and the second support plate (701).

2. The easily disassembled prefabricated tunnel invert arch structure according to claim 1, characterized in that: The cast-in-place secondary lining (2) of the arch wall includes the tunnel initial support steel frame (201) and the second pouring layer (202). The second pouring layer (202) is cast in place in the tunnel initial support steel frame (201). The lower end of the cast-in-place secondary lining (2) of the arch wall is connected to the bottom arch support prefabricated component (1) through the joint (3) to form a ring.

3. The easily disassembled prefabricated tunnel invert arch structure according to claim 1, characterized in that: The communication conduit (103), electrical conduit (104), and water supply and drainage conduit (105) are all installed in the first pouring layer (106).

4. The easily disassembled prefabricated tunnel invert arch structure according to claim 2, characterized in that: The joint (3) is provided with a tenon (10), which includes a tenon (1001) or a groove (1002). The tenon (1001) and the groove (1002) are detachably inserted and fixed. The tenon (1001) is located on the side of the tunnel initial support steel frame (201) near the joint (3), and the groove (1002) is opened on the side of the bottom support (101) near the joint (3).

5. The easily disassembled prefabricated tunnel invert arch structure according to claim 1, characterized in that: Both ends of the base support (101) are provided with sealing plates (107), and each sealing plate (107) has an inspection hole (108).

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