Tunnel lining construction method

Abstract

The application provides a tunnel element concrete lining construction method, which comprises the following steps: S10, constructing an initial support on the inner periphery of a tunnel; S20, dividing a plurality of construction sections y1, y2,..., yn along the extension direction of the tunnel on the initial support; S30, installing a first clamping part in the tunnel; S40, installing a steel reinforcement assembly on one half of the fixed steel plate, and the steel reinforcement assembly is located in the construction section y1; S50, installing a second clamping part between the fixed steel plate and the initial support; S60, pouring concrete in the construction section y1; S70, moving the first clamping part to the end of the construction section y2 and at the construction section y3; and S80, repeating the steps S40-S70. The tunnel element concrete lining construction method provided by the application guarantees the overall performance after concrete pouring.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of railway tunnel, and particularly relates to a tunnel plain concrete lining construction method. BACKGROUND

[0002] Lining refers to a permanent support structure constructed along the periphery of a tunnel hole body with reinforced concrete and other materials to prevent deformation or collapse of surrounding rock. Lining technology is usually applied in tunnel engineering and water channels. When the stability of surrounding rock is good, secondary lining of plain concrete is often used in high-speed railway tunnels. Due to the influence of construction technology, there are often quality defects such as non-compaction and low strength at the end of the one-mold lining. In the process of use, the aerodynamic effect caused by the operation of high-speed trains in the tunnel causes the concrete lining near the circumferential construction joint to fall off under the action of cyclic dynamic load, which seriously affects the safety of train operation. SUMMARY

[0003] The embodiment of the present application provides a tunnel plain concrete lining construction method, which aims to solve the technical problem of non-compaction and easy falling of the existing lining.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a tunnel plain concrete lining construction method is provided, comprising:

[0005] S10: constructing an initial support on the inner periphery of the tunnel;

[0006] S20: dividing a plurality of construction sections y1, y2,..., yn along the extension direction of the initial support of the tunnel;

[0007] S30: installing a first clamping part in the tunnel, the first clamping part being at the end of the construction section y1 and located in the construction section y2;

[0008] S40: installing a steel reinforcement assembly on one half of the fixed steel plate, and installing the fixed steel plate on the first clamping part, the steel reinforcement assembly being within the range of the construction section y1, and the other half of the fixed steel plate being within the range of the construction section y2;

[0009] S50: installing a second clamping part between the fixed steel plate and the initial support, the first clamping part and the second clamping part forming a clamping assembly for clamping the fixed steel plate;

[0010] S60: the first clamping part and the second clamping part form an end template, and concrete pouring is carried out in the construction section y1;

[0011] S70: disassembling the clamping assembly, installing a reinforcing bar assembly on the fixed steel plate in the range of the construction section y2, moving the first clamping part to the end of the construction section y2 and at the construction section y3;

[0012] S80: repeating the steps S40-S70 until the concrete pouring process in all the construction sections is completed.

[0013] In a possible implementation, the step S30 comprises:

[0014] S31: placing a trolley in the tunnel and positioning, the trolley comprising a trolley formwork;

[0015] S32: opening a through hole on the trolley formwork, the first clamping part being provided with a threaded hole corresponding to the through hole, and installing a fixing bolt on the trolley formwork and the first clamping part, the fixing bolt penetrating through the through hole and cooperating with the threaded hole.

[0016] In a possible implementation, an air bag is further arranged between the primary support and the second clamping part, and the air bag is used to press the second clamping part to clamp the fixed steel plate together with the first clamping part.

[0017] In a possible implementation, an inclined strut is further connected between the second clamping part and the fixed steel plate.

[0018] In a possible implementation, the first clamping part is rotatably connected to the trolley formwork through a rotating shaft, and the first clamping part has a first state of rotating to the trolley formwork for clamping the fixed steel plate together with the second clamping part, and a second state of rotating to the bottom of the trolley formwork for storage.

[0019] In a possible implementation, the step S40 of installing a reinforcing bar assembly comprises the following steps:

[0020] S41: installing a connecting steel bar at the position of the fixed steel plate in the construction section y1;

[0021] S42: installing a steel mesh at the end of the connecting steel bar away from the fixed steel plate, and the connecting steel bar and the steel mesh constitute the reinforcing bar assembly.

[0022] In a possible implementation, the step S41 further comprises the following steps before the step S41:

[0023] installing a water stop tape on the side of the fixed steel plate facing the primary support.

[0024] In a possible implementation, the length of the connecting steel bar is calculated according to the following formula:

[0025] L = d / 2 - 5

[0026] Wherein, L is the length of the connecting steel bar, unit cm; d is the pouring thickness of the corresponding construction section concrete, unit cm.

[0027] In a possible implementation, the fixing steel plate is provided with a plurality of mounting holes, and the connecting steel bar is matched with the plurality of mounting holes one by one;

[0028] The plurality of mounting holes are arranged in an array.

[0029] In a possible implementation, the depth of the mounting hole is two-thirds of the thickness of the fixing steel plate.

[0030] Compared with the prior art, in the application, the concrete construction is performed on the inner side of the initial support, and after the concrete of adjacent two construction sections is poured, the fixing steel plate is connected therebetween, the construction joint formed by the adjacent two construction sections can be reinforced, and the risk of block falling caused by the non-compactness of the concrete at the construction joint is eliminated; the pre-assembly of the fixing steel plate and the steel bar reinforcing assembly between the adjacent two construction sections can be realized, and the overall performance after the concrete is poured is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The construction state schematic diagram of the tunnel concrete lining construction method provided by the embodiment of the application is shown;

[0032] Figure 2 The enlarged structure schematic diagram of the A part in the middle is shown; Figure 1

[0033] The cross-sectional structure schematic diagram of the tunnel concrete lining construction method provided by the embodiment of the application is shown (from the right view angle); Figure 3 Figure 1 The construction step schematic diagram of the tunnel concrete lining construction method provided by the embodiment of the application is shown;

[0034] Figure 4 Figure 1 The unfolded structure schematic diagram of the fixing steel plate used in the embodiment of the application is shown;

[0035] Figure 5 The distribution state schematic diagram of the fixing steel plate, the connecting steel bar and the steel bar net used in the embodiment of the application is shown;

[0036] Figure 6 The construction step schematic diagram of the tunnel concrete lining construction method provided by the embodiment of the application is shown;

[0037] Figure 7 The construction step schematic diagram of the tunnel concrete lining construction method provided by the embodiment of the application is shown; Figure 2

[0038] ​​​Reference numerals:

[0039] 10 - fixed steel plate; 11 - mounting hole;

[0040] 20 - connecting steel bar;

[0041] 30 - steel bar mesh;

[0042] 40 - water stop;

[0043] 50 - waterproof board;

[0044] 60 - primary support;

[0045] 70 - end formwork;

[0046] 80 - trolley formwork; 81 - first clamping part; 82 - second clamping part; 83 - air bag; 84 - fixing bolt; 85 - inclined strut; 86 - rotating shaft. DETAILED DESCRIPTION

[0047] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0048] In the present embodiment, the term "inner" refers to the side facing the tunnel space, and the term "outer" refers to the side facing away from the tunnel space, wherein the "lower" and "bottom" directions are the same as the "inner", and the "upper" and "top" directions are the same as the "outer".

[0049] Please refer to Figures 1 to 7 , the tunnel concrete lining construction method provided by the present application will be described. The tunnel concrete lining construction method comprises the following steps:

[0050] S10: constructing a primary support 60 on the inner periphery of the tunnel;

[0051] S20: dividing a plurality of construction sections y1, y2,..., yn along the extension direction of the primary support 60 of the tunnel;

[0052] S30: installing a first clamping part 81 in the tunnel, the first clamping part 81 being located at the end of the construction section y1 and in the construction section y2;

[0053] S40: installing a steel bar reinforcing assembly on one half of the fixed steel plate 10, and installing the fixed steel plate 10 on the first clamping part 81, the steel bar reinforcing assembly being located within the construction section y1, and the other half of the fixed steel plate 10 being located within the construction section y2;

[0054] S50: installing the second clamping part 82 between the fixed steel plate 10 and the primary support 60, the first clamping part 81 and the second clamping part 82 form a clamping assembly for clamping the fixed steel plate 10;

[0055] S60: the first clamping part 81 and the second clamping part 82 form the end template 70, and the concrete pouring is performed in the construction section y1;

[0056] S70: disassembling the clamping assembly, installing the reinforcing assembly on the fixed steel plate 10 in the construction section y2, and moving the first clamping part 81 to the end of the construction section y2 and at the construction section y3;

[0057] S80: repeating the steps S40-S70 until the concrete pouring process in all construction sections is completed.

[0058] It should be noted that after the pouring of each construction section is completed, a gap will be formed due to the adjacent construction joint formed by twice pouring, and the gap at the end of each of the adjacent two construction sections is combined to form the construction joint. And the above-mentioned steps S40-S70 are not always poured in y1 and y2 sections, but when repeated, the corresponding construction section will be changed to y3, y4, …, yn, etc. in turn until the pouring process of all construction sections is completed.

[0059] Optionally, the size of the steel plate can be selected as 1.2m.

[0060] Compared with the prior art, the tunnel concrete lining construction method provided by the embodiment can realize the pre-assembly of the fixed steel plate 10 and the reinforcing assembly between the adjacent two construction sections, and ensure the overall performance after the concrete pouring.

[0061] In some embodiments, one specific implementation of the above-mentioned S30 step can adopt a structure as shown in Figure 4 Referring to Figure 4 , the S30 step includes:

[0062] S31: placing a trolley in the tunnel and positioning the trolley, the trolley including a trolley template 80;

[0063] S32: a through hole is formed on the trolley template 80, a threaded hole corresponding to the through hole is arranged on the first clamping part 81, a fixing bolt 84 is arranged between the trolley template 80 and the first clamping part 81, and the fixing bolt 84 penetrates through the through hole and cooperates with the threaded hole.

[0064] Since the concrete pouring in the construction section y1 is completed, the position of the clamping assembly of the clamping part needs to be changed. When the position needs to be changed, the second clamping part is directly removed, the fixing bolts 84 are removed, and then the first clamping part 81 is removed. The trolley can be directly moved to change the position, which is convenient to operate and helps to improve the construction efficiency. The first clamping part 81 and the trolley form 80 are connected through the fixing bolts 84, which facilitates the removal and replacement of the first clamping part 81 and is flexible to use.

[0065] In some embodiments, an improved embodiment of the above-mentioned first clamping part 81 can adopt the structure as shown in Figure 4 . Referring to Figure 4 , the first clamping part 81 is rotatably connected to the trolley form 80 through the rotating shaft 86. The first clamping part 81 has a first state of being rotated to the trolley form 80 for cooperating with the second clamping part 82 to clamp the steel plate, and a second state of being rotated to the bottom of the trolley form 80 for storage. After the fixing bolts 84 on the first clamping part 81 are removed, the first clamping part 81 can be rotated to the bottom of the trolley form 80 for convenient movement with the trolley. After the trolley is moved and positioned, the first clamping part 81 is directly rotated, so that the threaded holes of the first clamping part 81 correspond to the through holes on the trolley form 80, and the fixing bolts 84 are installed to complete the fixing.

[0066] In some embodiments, an improved embodiment of the above-mentioned S30 step can adopt the structure as shown in Figure 4 . Referring to Figure 4 , the air bag 83 is further provided between the primary support 60 and the second clamping part 82. The air bag 83 is used to extrude the second clamping part 82 to cooperate with the first clamping part 81 to clamp the steel plate 10. After the first clamping part 81 is installed on the trolley form 80, the steel plate 10 is placed on the first clamping part 81, and then the second clamping part 82 and the air bag 83 are installed on the side of the steel plate 10 facing the primary support 60. The air bag 83 is between the primary support 60 and the second clamping part 82. After installation is completed, air is filled into the air bag 83 through the air pump. The air bag 83 extrudes the second clamping part 82 to gradually approach the steel plate 10, realizes cooperation and clamping with the first clamping part 81, completes the fixing of the steel plate 10, and then the pouring of the concrete can be carried out. By providing the air bag 83, the installation of the second clamping part 82 is facilitated, and the air bag 83 can buffer the extrusion strength of the second clamping part 82 on the primary support, preventing the damage of the primary support 60. The air bag 83 can also adapt to the unevenness of the surface of the primary support to ensure that the grout is not leaked.

[0067] It should be noted that when the inner side of the primary support 60 is provided with the waterproof plate 50, the air bag 83 is between the second clamping part 82 and the waterproof plate 50.

[0068] In some embodiments, an improved embodiment of the above-mentioned S30 step can adopt the structure as shown in Figure 4The structure shown. (See attached image.) Figure 4 A diagonal brace 85 is also connected between the second clamping part 82 and the fixed steel plate 10. By setting the diagonal brace 85, the positioning of the second clamping part 82 on the fixed steel plate 10 is facilitated. During the clamping process of the fixed steel plate 10 by the airbag 83, since the first clamping part 81 is fixed to the trolley template 80 and there is no need to consider the misalignment problem, the second clamping part 82 is only placed on the fixed steel plate 10. It is easy to be misaligned by the compression of the airbag 83, which will affect the clamping process with the first clamping part 81. By setting the diagonal brace 85, the second clamping part 82 and the first clamping part 81 are ensured to correspond vertically, thus ensuring the installation effect of the fixed steel plate.

[0069] In some embodiments, an improved implementation of step S40 described above may employ, as follows: Figure 4 The structure shown. (See attached image.) Figure 4 The installation of the steel reinforcement assembly in step S40 includes the following steps:

[0070] S41: Install connecting steel bars 20 at the location of the fixed steel plate 10 in construction section y1;

[0071] S42: Install a steel mesh 30 at the end of the connecting steel bar 20 facing away from the fixed steel plate 10. The steel mesh 30 and the connecting steel bar 20 form a steel reinforcement assembly.

[0072] Optionally, the size of the steel mesh is 1.4m.

[0073] A first clamping part 81 is installed on the trolley template 80. Connecting steel bars 20 and steel mesh 30 are assembled on the fixed steel plate 10. After assembly, the fixed steel plate 10 is placed on the first clamping part 81. A second clamping part 82 and an airbag 83 are installed on the fixed steel plate 10. The fixed steel plate 10 is clamped by inflating the airbag 83. In this structure, the fixed steel plate 10, connecting steel bars 20, and steel mesh 30 are all installed within the range of two adjacent construction sections, thereby improving the connection strength of the concrete after the two adjacent construction sections are poured and compensating for the defect of easy breakage between adjacent construction sections.

[0074] Specifically, the fixing steel plate 10 can be an arc-shaped plate adapted to the shape of the tunnel. The fixing steel plate 10 is arc-shaped and fits the inner side of the initial support 60 to ensure that it is in the middle position of the secondary lining.

[0075] In some embodiments, an improved implementation of step S40 described above may employ, as follows: Figure 3 , Figure 4 and Figure 7 The structure shown. (See attached image.) Figure 3 , Figure 4 and Figure 7 The steps between S41 and S42 also include:

[0076] The waterstop 40 is installed on the side of the fixed steel plate 10 facing the primary support 60.

[0077] Since two adjacent construction sections form a construction joint after pouring, water is easily leaked from the construction joint and dripped into the tunnel during construction and use, long-term leakage reduces the service life of the lining, and frequent leakage also requires repair construction, increasing costs; by setting the waterstop 40 on the side of the fixed steel plate 10 facing away from the steel mesh 30, water leakage is prevented, the service life of the lining is improved, repair is avoided, and dripping water that can cause the fixed steel plate 10 to rust and affect the support strength inside the concrete is also avoided.

[0078] Specifically, the installation steps of the waterstop 40 are as follows: before the fixed steel plate 10 is installed in the first clamping part 81, a line is marked on the center line, after marking, the grid-shaped adhesive is laid on the fixed steel plate 10, and then the waterstop 40 is pasted on the fixed steel plate 10. By marking, the pasting position of the waterstop 40 is determined; the grid-shaped adhesive laying not only reduces the amount of adhesive, but also ensures the bonding strength of the waterstop 40.

[0079] In some embodiments, the improved embodiment of the fixed steel plate 10 described above can adopt the structure as follows. Referring to Figure 3 , a plurality of fixed steel plates 10 are provided along the extension path of the tunnel, a steel mesh 30 is arranged on each half of one fixed steel plate 10, and each steel mesh 30 is connected to the corresponding position of the fixed steel plate 10 by a connecting steel bar 20. The number of fixed steel plates 10 is one less than the number of construction sections, and in two adjacent clamping assemblies, as shown in Figure 3 , the steel mesh 30 installed on the right half of the left fixed steel plate 10 is arranged separately from the steel mesh 30 installed on the left half of the right fixed steel plate 10, and the steel mesh 30 is connected to the fixed steel plate 10 by the connecting steel bar 20 to ensure the stability of the steel mesh 30; and two spaced steel meshes 30 are provided on each fixed steel plate 10, and each construction section includes at least two separately arranged steel meshes 30, facilitating assembly and construction.

[0080] In the specific implementation process, the steel mesh 30 does not completely cover the length direction of each construction section, but is arranged within a certain range on both sides of the construction joint.

[0081] In some embodiments, the length calculation formula of the connecting steel bar 20 is:

[0082] L = d / 2-5

[0083] Where L is the length of the connecting steel bar 20, in cm; d is the pouring thickness of the corresponding construction section of concrete, in cm.

[0084] The length of the connecting steel bars 20 is determined according to the thickness of the concrete pouring of the corresponding construction section, so as to ensure that the length of the connecting steel bars 20 is adapted to the construction strength.

[0085] In some embodiments, one improved embodiment of the fixed steel plate 10 can adopt the structure as described below. Referring to Figure 5 , the fixed steel plate 10 is provided with a plurality of mounting holes 11, and the connecting steel bars 20 are one-to-one matched with the plurality of mounting holes 11; the plurality of mounting holes 11 are arranged in an array. Optionally, the plurality of mounting holes 11 can be arranged in a rectangular array, a circular array, a quincunx array, etc. By providing the mounting holes 11 on the fixed steel plate 10 in advance, the positioning and installation of the connecting steel bars 20 are facilitated, the neat arrangement of the connecting steel bars 20 on the fixed steel plate 10 is ensured, the construction is facilitated, and the construction efficiency is improved.

[0086] For example, the mounting holes 11 on each fixed steel plate 10 are arranged in a 4*8 rectangular array. The length direction and the width direction of the rectangular array can be parallel or different from the length and width of the fixed steel plate 10, i.e., the length direction of the rectangular array can be parallel to the length direction of the fixed steel plate 10, or parallel to the width direction of the fixed steel plate 10.

[0087] Specifically, one end of the connecting steel bar 20 close to the fixed steel plate 10 is provided with a screw thread, and the screw thread is matched with the mounting hole 11. The end of the connecting steel bar 20 is provided with a screw thread and then matched with the mounting hole 11, which not only facilitates the installation of the connecting steel bar 20, but also improves the connection stability through the cooperation of the screw thread on the screw thread and the screw thread in the mounting hole 11.

[0088] In some embodiments, one specific embodiment of the above mounting hole 11 can adopt the structure as described below. The depth of the mounting hole 11 is two-thirds of the thickness of the fixed steel plate 10. After the mounting hole 11 is provided, the installation of the connecting steel bar 20 can be one-to-one corresponding to the plurality of mounting holes 11, or one connecting steel bar 20 can be installed every several mounting holes 11. This kind of way can adapt to the distribution of different numbers of connecting steel bars 20 in different shapes on the fixed steel plate 10, and then adapt to the installation of the steel mesh 30.

[0089] In some embodiments, one improved embodiment of the above tunnel element concrete lining construction method can adopt the structure as shown in Figure 3 , Figure 4 and Figure 7 . Referring to Figure 3 , Figure 4 and Figure 7 , the steps S10 and S20 further include:

[0090] The waterproof board 50 is installed on the inner side of the primary support 60.

[0091] The waterproof plate 50 is arranged on the inner side of the primary support 60, and then the construction section is divided on the waterproof plate 50, and then the installation of the clamping assembly, the fixed steel plate, the reinforcing steel bar assembly is carried out, and finally the concrete is poured; wherein the side of the fixed steel plate 10 facing the primary support 60 is also provided with a water stop belt 40, and the water stop belt 40 is combined with the waterproof plate 50 to improve the waterproof property and ensure the construction quality of the tunnel.

[0092] A specific construction process of the embodiment of the application is as follows (taking the case of being divided into four construction sections as an example):

[0093] (1) The primary support 60 is constructed on the inner periphery of the tunnel;

[0094] (2) The waterproof plate 50 is installed on the inner side of the primary support 60;

[0095] (3) The construction sections y1, y2, y3 and y4 are divided on the primary support 60 along the extension direction of the tunnel;

[0096] (4) The connecting steel bars 20 and the steel mesh 30 are installed on one of the halves of the fixed steel plate 10;

[0097] (5) The trolley is installed in the tunnel, the first clamping part 81 is fixed on the trolley formwork 80 of the trolley, the water stop belt 40 is installed on one side of the fixed steel plate 10 and placed on the first clamping part 81 (the water stop belt 40 is placed away from the first clamping part 81), and then the second clamping part 82 and the air bag 83 are installed on the top of the fixed steel plate 10, the second clamping part 82 is arranged above the water stop belt 40, wherein the first clamping part 81, the second clamping part 82 and the air bag 83 are located at the end of the construction section y1 and in the construction section y2;

[0098] (6) The air bag 83 is inflated, the air bag 83 extrudes the second clamping part 82 to abut against the fixed steel plate 10, the second clamping part 82 cooperates with the first clamping part 81 to clamp the fixed steel plate 10, so that the connecting steel bars 20 and the steel mesh 30 on the fixed steel plate 10 are located in the construction section y1;

[0099] (7) The concrete pouring is carried out in the construction section y1 (see Figure 4 );

[0100] (8) The air bag 83 is deflated, and the air bag 83, the second clamping part 82 and the first clamping part 81 are removed in sequence, and the trolley is moved to the end of the construction section y2 away from the construction section y1;

[0101] (9) The connecting steel bars 20 and the steel mesh 30 are installed on the part of the fixed steel plate 10 located in the construction section y2 in the step (4), and the connecting steel bars 20 and the steel mesh 30 are installed on one of the halves of the new fixed steel plate 10;

[0102] (10) Fix the first clamping part 81 on the trolley formwork 80 of the trolley, install the water stop 40 on one side of the new fixed steel plate 10 and place it on the first clamping part 81 (the water stop 40 is placed away from the first clamping part 81), then install the second clamping part 82 and the air bag 83 on the top of the new fixed steel plate 10, the second clamping part 82 covers the water stop 40, wherein the first clamping part 81, the second clamping part 82 and the air bag 83 are located at the end of the construction section y2 and in the construction section y3;

[0103] (11) Inflating the air bag 83, the air bag 83 extrudes the second clamping part 82 to abut the fixed steel plate 10, the second clamping part 82 clamps the new fixed steel plate 10 in cooperation with the first clamping part 81;

[0104] (12) Pouring concrete in the construction section y2 (see Figure 7 );

[0105] (13) Deflating the air bag 83, and sequentially removing the air bag 83, the second clamping part 82 and the first clamping part 81, the trolley moves to the end of the construction section y3 away from the construction section y2;

[0106] (14) Installing the connecting steel bars 20 and the steel bars 30 on the part of the fixed steel plate 10 in the construction section y3 in step (9), and installing the connecting steel bars 20 and the steel bars 30 on one half of the new fixed steel plate 10;

[0107] (15) Fixing the first clamping part 81 on the trolley formwork 80 of the trolley, installing the water stop 40 on one side of the new fixed steel plate 10 and placing it on the first clamping part 81 (the water stop 40 is placed away from the first clamping part 81), then installing the second clamping part 82 and the air bag 83 on the top of the fixed steel plate 10, the second clamping part 82 covers the water stop 40, wherein the first clamping part 81, the second clamping part 82 and the air bag 83 are located in the construction section y3 and in the construction section y4;

[0108] (15) Inflating the air bag 83, the air bag 83 extrudes the second clamping part 82 to abut the fixed steel plate 10, the second clamping part 82 clamps the new fixed steel plate 10 in cooperation with the first clamping part 81;

[0109] (17) Pouring concrete in the construction section y3;

[0110] (18) Installing the connecting steel bars 20 and the steel bars 30 on the part of the fixed steel plate 10 in the construction section y4 in step (14);

[0111] (19) Pouring concrete in the construction section y4, and completing the construction (see Figure 3 )。

[0112] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for constructing plain concrete lining in tunnels, characterized in that, Includes the following steps: S10: Initial support during the inner circumference construction of the tunnel; S20: The initial support is divided into multiple construction sections y1, y2, ..., yn along the extension direction of the tunnel; S30: Install a first clamping part inside the tunnel, the first clamping part being located at the end of the construction section y1 and within the construction section y2; S40: Install a reinforcing steel reinforcement assembly on one half of the fixed steel plate within the construction section y1, and install the fixed steel plate on the first clamping part. The reinforcing steel reinforcement assembly is within the construction section y1, and the other half of the fixed steel plate is within the construction section y2. S50: A second clamping part is installed between the fixed steel plate and the initial support, wherein the first clamping part and the second clamping part constitute a clamping assembly for clamping the fixed steel plate; S60: The first clamping part and the second clamping part form an end template, and concrete is poured in the construction section y1; S70: Disassemble the clamping assembly, install the reinforcing steel reinforcement assembly on the fixed steel plate within the range of the construction section y2, and move the first clamping part to the end of the construction section y2 and to the location of the construction section y3; S80: Repeat steps S40-S70, and change the construction segment in sequence each time steps S40-S70 are repeated, until the concrete pouring process in all construction segments is completed.

2. The tunnel plain concrete lining construction method as described in claim 1, characterized in that, Step S30 includes: S31: Place and position a trolley in the tunnel, the trolley including a trolley template; S32: A through hole is opened on the trolley template, and a threaded hole corresponding to the through hole is provided on the first clamping part. A fixing bolt is installed on the trolley template and the first clamping part, and the fixing bolt passes through the through hole and engages with the threaded hole.

3. The tunnel plain concrete lining construction method as described in claim 2, characterized in that, An airbag is also provided between the initial support and the second clamping part. The airbag is used to compress the second clamping part to cooperate with the first clamping part to clamp the fixed steel plate.

4. The tunnel plain concrete lining construction method as described in claim 3, characterized in that, The second clamping part is also connected to the fixed steel plate by a diagonal brace.

5. The tunnel plain concrete lining construction method as described in claim 2, characterized in that, The first clamping part is rotatably connected to the trolley template via a rotating shaft. The first clamping part has a first state in which it rotates to the trolley template to cooperate with the second clamping part to clamp the fixed steel plate, and a second state in which it rotates to the bottom of the trolley template for storage.

6. The tunnel plain concrete lining construction method as described in claim 1, characterized in that, The installation of the steel reinforcement assembly in step S40 includes the following steps: S41: Install connecting steel bars at the location of the fixed steel plate in the construction section y1; S42: Install a reinforcing mesh at the end of the connecting steel bar facing away from the fixed steel plate, and the connecting steel bar and the reinforcing mesh constitute the reinforcing reinforcement assembly.

7. The tunnel plain concrete lining construction method as described in claim 6, characterized in that, The steps preceding step S41 also include: A waterstop is installed on the side of the fixed steel plate facing the initial support.

8. The tunnel plain concrete lining construction method as described in claim 6, characterized in that, The formula for calculating the length of the connecting steel bars is: L=d / 2-5 Where L is the length of the connecting steel bar in cm; d is the pouring thickness of the concrete in the corresponding construction section in cm.

9. The tunnel plain concrete lining construction method as described in claim 6, characterized in that, The fixing steel plate is provided with multiple mounting holes, and the connecting steel bars are matched with the multiple mounting holes one by one; The mounting holes are arranged in an array.

10. The tunnel plain concrete lining construction method as described in claim 9, characterized in that, The depth of the mounting hole is two-thirds of the thickness of the fixing steel plate.

Images