Lining structure and its construction method

Abstract

The present disclosure relates to the technical field of tunnel construction, and particularly to a lining structure and a construction method thereof. The lining structure includes: a lining body, a protection plate and a reserved layer; the protection plate is installed on the inner surface of the lining body through an anchoring structure; a gap between the top of the lining body and the inner wall of the tunnel forms the reserved layer, and the reserved layer is used for pouring the lining body, and a support structure is filled in the reserved layer. With the setting of the reserved layer, in the lining structure, when pouring the lining body, workers can complete the pouring work from top to bottom at the position of the reserved layer, so as to ensure visual work. Without using an attached vibrator for vibrating work, the lining body can be vibrated densely. At the same time, the situation of voids behind the lining can be prevented. It should be understood that by using a pump pipe to carry out the pouring work at the reserved layer, the complex work of repeatedly connecting and replacing the pump pipe in the traditional method can also be avoided, and the construction efficiency can be significantly improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of tunnel construction, and particularly relates to a lining structure and a construction method thereof. Background Art

[0002] At present, most of the ways to construct tunnel linings at home and abroad adopt lining formwork cars. Generally, concrete is poured from the windows of the lining formwork car for the side walls of the lining, and the insertion vibration method is used, and its quality can generally be guaranteed. However, for the arch part of the lining, concrete is poured from bottom to top, and generally an attached vibrator is used for vibration, and visual construction cannot be achieved. Although there are many prevention and detection means, there will still be insufficient thickness of the tunnel lining, and there are cavities behind the lining, resulting in cracking and peeling of the lining. There are also some phenomena where the construction joints of some tunnels and the repair of the concrete on the lining surface are not firmly bonded and fall off. Summary of the Invention

[0003] In order to solve the above technical problems, the present disclosure provides a lining structure and a construction method thereof.

[0004] In a first aspect, the present disclosure provides a lining structure, including: a lining body, a protection plate, and a reserved layer;

[0005] The protection plate is installed on the inner surface of the lining body through an anchoring structure;

[0006] A gap between the top of the lining body and the inner wall of the tunnel forms the reserved layer, and the reserved layer is used for the pouring work of the lining body, and a support structure is filled in the reserved layer.

[0007] Optionally, the anchoring structure is a T-shaped steel, the root of the T-shaped steel is connected to the protection plate, and the head extends into the lining body and is anchored to the lining body.

[0008] Optionally, the number of the T-shaped steels is multiple, and the multiple T-shaped steels are arranged along the extending direction of the tunnel, and the T-shaped steels extend along the circumferential direction of the tunnel.

[0009] Optionally, it further includes a partition board, the partition board is attached to the inner wall of the tunnel, and the partition board is used to separate the reserved layer from the inner wall of the tunnel and separate the lining body from the inner wall of the tunnel.

[0010] Optionally, the protection plate is an inner formwork for pouring the lining body.

[0011] Optionally, the support structure is foamed concrete.

[0012] Optionally, the protection plate is provided with a hanging ring structure.

[0013] Second aspect, the present disclosure provides a construction method for the lining structure as described above, including the following steps:

[0014] Step 1: Expand the arch part of the tunnel upward, and the expanded space matches the shape of the reserved layer;

[0015] Step 2: Install partitions on the set section of the inner wall of the tunnel;

[0016] Step 3: Assemble the protection board and the protection board support frame, and transport them to the set position in the tunnel;

[0017] Step 4: Start pouring the lining body from the position of the reserved layer;

[0018] Step 5: After pouring, fill the reserved layer with foam concrete;

[0019] Step 6: Separate the protection board and the protection board support frame.

[0020] Optionally, between Step 3 and Step 4, it further includes tying the steel bar structure of the lining body in two steps. The outer steel bars of the steel bar structure are tied normally, and the inner steel bars are tied to the protection board after the protection board and the protection board support frame are assembled.

[0021] Optionally, after the protection board and the protection board support frame are moved to the set position in the tunnel, the construction workers tie the tie bars for connecting the outer steel bars and the inner steel bars in sequence from the end of the protection board facing the inner side of the tunnel to the end of the protection board facing the outer side of the tunnel.

[0022] The technical solution provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0023] For the lining structure provided by the present disclosure, through the setting of the reserved layer, when pouring the lining body, workers can complete the pouring work from top to bottom at the position of the reserved layer, thus ensuring visual work. Without using an attached vibrator for vibrating work, it can be vibrated densely. At the same time, it can prevent the situation of voids behind the lining. It should be understood that using the pump pipe to carry out the pouring work at the reserved layer can also avoid the complex work of repeatedly connecting and replacing the pump pipe in the traditional method, significantly improve the construction efficiency, and also avoid the occurrence of concrete step difference caused by setting windows in the traditional method; through the setting of the protection board and the anchoring structure, after the lining body is poured, the protection board can be left on the lining body to form an integral structure, and the protection board can prevent the lining concrete from falling off, thereby improving safety. Description of the Drawings

[0024] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present disclosure, and are used together with the description to explain the principles of the present disclosure.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Structural schematic diagram of the lining structure described in the embodiments of the present disclosure;

[0027] Figure 2 Flowchart of the construction method of the lining structure described in the embodiments of the present disclosure;

[0028] Figure 3 Structural schematic diagram of the installation of the guard plate part in the lining structure described in the embodiments of the present disclosure on the guard plate support frame;

[0029] Figure 4 Structural schematic diagram of the complete installation of the guard plate of the lining structure described in the embodiments of the present disclosure on the guard plate support frame.

[0030] Wherein, 1. Lining body; 2. Guard plate; 3. Reserved layer; 4. Partition board; 5. Tunnel; 6. Guard plate support frame. Specific embodiments

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present disclosure, the following will further describe the solutions of the present disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0033] Currently, most of the domestic and foreign methods for constructing tunnel linings adopt lining trolley construction. Generally, concrete is poured from the windows of the lining trolley for the side walls of the lining, and the insertion vibration method is used, and its quality can generally be guaranteed. However, for the arch part of the lining, concrete is poured from bottom to top, and generally an attached vibrator is used for vibration, and visual construction cannot be achieved. Although there are many prevention and detection means, there will still be a situation where the thickness of the tunnel lining is insufficient, and there are cavities behind the lining, resulting in cracking and peeling of the lining. There are also some cases where the repair and bonding of the construction joints and the concrete on the surface of the lining in some tunnels are not firm and peeling occurs.

[0034] Based on this, this embodiment provides a lining structure and its construction method. Through the setting of the reserved layer, when pouring the lining body, workers can complete the pouring work from top to bottom at the position of the reserved layer, thereby ensuring visual work. Without using an attached vibrator for vibration work, the vibration can be dense. At the same time, it can prevent the situation of voids behind the lining. It should be understood that using the pump pipe for pouring work at the reserved layer can also avoid the complex work of repeatedly connecting and replacing the pump pipe in the traditional method, significantly improving the construction efficiency, and also avoiding the occurrence of concrete stepped joints caused by setting windows in the traditional method; through the setting of the guard plate and the anchoring structure, after the lining body is poured, the guard plate can be left on the lining body to form an integral structure, and the guard plate can prevent the lining concrete from falling off, thereby improving safety. The following will be described in detail through specific embodiments:

[0035] Referring to Figures 1 to 4 As shown, a lining structure provided in this embodiment includes: a lining body 1, a guard plate 2, and a reserved layer 3; the guard plate 2 is installed on the inner surface of the lining body 1 through an anchoring structure; the gap between the top of the lining body 1 and the inner wall of the tunnel 5 forms a reserved layer 3, and the reserved layer 3 is used for pouring the lining body 1, and a support structure is filled in the reserved layer 3.

[0036] Among them, through the setting of the reserved layer 3, when pouring the lining body 1, workers can complete the pouring work from top to bottom at the position of the reserved layer 3, thereby ensuring visual work. Without using an attached vibrator for vibration work, the vibration can be dense. At the same time, it can prevent the situation of voids behind the lining. It should be understood that using the pump pipe for pouring work at the reserved layer 3 can also avoid the complex work of repeatedly connecting and replacing the pump pipe in the traditional method, significantly improving the construction efficiency, and also avoiding the occurrence of concrete stepped joints caused by setting windows in the traditional method; through the setting of the guard plate 2 and the anchoring structure, after the lining body 1 is poured, the guard plate 2 can be left on the lining body 1 to form an integral structure, and the guard plate 2 can prevent the lining concrete from falling off, thereby improving safety.

[0037] In some embodiments, the anchoring structure is a T-shaped steel. The root of the T-shaped steel is connected to the protective plate 2, and the head extends into the lining body 1 and is anchored to the lining body 1. It should be noted that other connection methods can also be used to fix the protective plate 2 on the lining body 1, such as I-beams, channel steels, steel plates, steel bars, etc., as long as the protective plate 2 can be stably maintained on the lining body 1; it should be noted that the width of the T-shaped steel is not greater than the clear spacing of the main reinforcement bars of the lining body 1, and the height of the T-shaped steel is not greater than the clear row spacing of the main reinforcement bars of the lining body 1; in some embodiments, the main reinforcement bars of the lining body 1 are φ20 steel bars with a spacing of 200 mm, the thickness of the lining body 1 is 380 mm, and the thickness of the steel bar protection layer is 40 mm; the width of the T-shaped steel is less than or equal to 180 mm (200 - 20 = 180 mm), the height of the T-shaped steel is not greater than 280 mm (380 - 40 - 40 - 20 = 280 mm), and the longitudinal spacing of the T-shaped steel is 0.5 - 1.0 m.

[0038] In a further embodiment, the number of T-shaped steels is multiple, and the multiple T-shaped steels are arranged along the extending direction of the tunnel 5, and the T-shaped steels extend along the circumferential direction of the tunnel 5; such an arrangement can not only improve the connection strength between the protective plate 2 and the lining body 1, but also enable the concrete at the top to slide down naturally along the groove-shaped structure of the T-shaped steel itself when pouring the lining body 1, thereby further ensuring the stable and firm pouring effect of the lining body 1.

[0039] Continue to refer to Figure 1 As shown, the lining structure further includes a partition plate 4. The partition plate 4 is attached to the inner wall of the tunnel 5 and is used to separate the reserved layer 3 from the inner wall of the tunnel 5 and the lining body 1 from the inner wall of the tunnel 5; it should be understood that the partition plate 4 can use an EVA waterproof board and be laid on the surface of the actual initial support, that is, laid above the reserved layer 3 at the arch position.

[0040] According to the need to refer to Figure 1 、 Figure 3 and Figure 4 As shown, the protective plate 2 is the inner formwork for pouring the lining body 1; the protective plate 2 can be assembled on the protective plate support frame 6 on the trolley outside the tunnel 5, transported to the designated position in the tunnel 5 by the trolley, and after completing the pouring operation of the lining body 1, the protective plate 2 and the protective plate support frame 6 can be separated, and the protective plate 2 can be directly left on the lining body 1.

[0041] In some embodiments, the support structure is foamed concrete. It should be understood that the support structure can also be other lightweight support materials or filling materials as long as the reserved layer 3 can be filled up.

[0042] In a further embodiment, a lifting ring structure is provided on the protective plate 2; through the arrangement of the lifting ring structure, the protective plate 2 can be conveniently installed on the protective plate support frame 6, improving the assembly efficiency; in some embodiments, the protective plate 2 includes an arc-shaped plate and a flat plate. The arc-shaped plate is used to be placed on the arched part at the top, and the flat plate is used to be placed on the side as a side plate structure; both the arc-shaped plate and the flat plate can be suspended on one side of the protective plate support frame 6 through the lifting ring structure and a lifting device, and then moved to the designated position through a slide rail structure, and finally assembled into the complete protective plate 2 structure.

[0043] In a second aspect, the present disclosure provides a construction method for a lining structure as above, including the following steps:

[0044] Step 1: Expand the arch part of the tunnel 5 upwards, and the expanded space matches the shape of the reserved layer 3;

[0045] Step 2: Install the partition plate 4 on the set section of the inner wall of the tunnel 5;

[0046] Step 3: Assemble the protective plate 2 and the protective plate support frame 6 and transport them to the set position of the tunnel 5;

[0047] Step 4: Start pouring the lining body 1 from the position of the reserved layer 3. It should be noted that workers can drill into the space of the reserved layer 3 for pouring;

[0048] Step 5: After pouring, fill the reserved layer 3 with foamed concrete;

[0049] Step 6: Separate the protective plate 2 and the protective plate support frame 6.

[0050] Continue to refer to Figure 2 As shown, between Step 3 and Step 4, the construction method of this lining structure further includes binding the steel bar structure of the lining body 1 in two steps. The outer steel bars of the steel bar structure are normally bound, and the inner steel bars are bound to the protective plate 2 after the protective plate 2 and the protective plate support frame 6 are assembled; it should be understood that a lining trolley can also be used to replace the protective plate support frame 6 structure. When using the lining trolley to transport the protective plate 2, the protective plate 2 and the anchoring structure need to be installed on the lining trolley in advance, then the inner steel bars are bound to the protective plate 2, and finally the lining trolley is pushed into place, the tie bars are bound, and then the pouring and vibrating work can be carried out.

[0051] In some embodiments, after the protective plate 2 and the protective plate support frame 6 are moved to the set position in the tunnel 5, the construction workers sequentially bind the tie bars for connecting the outer steel bars and the inner steel bars from the end of the protective plate 2 facing the inner side of the tunnel 5 to the end of the protective plate 2 facing the outer side of the tunnel 5.

[0052] The specific implementation manner and implementation principle are the same as those of the above embodiments, and can bring the same or similar technical effects, which will not be elaborated one by one here. Specifically, reference can be made to the description of the above lining structure embodiments.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0054] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A construction method of a lining structure, characterized in that, it includes the following steps: Step 1: Expand the arch part of the tunnel (5) upward, and the expanded space matches the shape of the reserved layer (3); Step 2: Install a partition board (4) on a set section of the inner wall of the tunnel (5); Step 3: Assemble the protection board (2) and the protection board support frame (6), and transport them to the set position of the tunnel (5); Step 4: Start pouring the lining body (1) from the position of the reserved layer (3); Step 5: After pouring, fill the reserved layer (3) with foam concrete; Step 6: Separate the protection board (2) from the protection board support frame (6); The lining structure it adopts includes: a lining body (1), a protection board (2) and a reserved layer (3); The protection board (2) is installed on the inner surface of the lining body (1) through an anchoring structure; The gap between the top of the lining body (1) and the inner wall of the tunnel (5) forms the reserved layer (3), and the reserved layer (3) is used for the pouring work of the lining body (1), and a support structure is filled in the reserved layer (3).

2. The construction method of the lining structure according to claim 1, characterized in that, the anchoring structure is a T-shaped steel, the root of the T-shaped steel is connected to the protection board (2), and the head extends into the lining body (1) and is anchored to the lining body (1).

3. The construction method of the lining structure according to claim 2, characterized in that, the number of the T-shaped steels is multiple, the multiple T-shaped steels are arranged along the extending direction of the tunnel (5), and the T-shaped steels extend along the circumferential direction of the tunnel (5).

4. The construction method of the lining structure according to claim 1, characterized in that, it further includes a partition board (4), the partition board (4) is attached to the inner wall of the tunnel (5), and the partition board (4) is used to separate the reserved layer (3) from the inner wall of the tunnel (5) and separate the lining body (1) from the inner wall of the tunnel (5).

5. The construction method of the lining structure according to claim 1, characterized in that, the protection board (2) is the inner formwork for pouring the lining body (1).

6. The construction method of the lining structure according to claim 1, characterized in that, the support structure is foam concrete.

7. The construction method of the lining structure according to claim 1, characterized in that, the protection board (2) is provided with a lifting ring structure.

8. The construction method of the lining structure according to claim 1, characterized in that, between step 3 and step 4, it further includes binding the steel bar structure of the lining body (1) in two steps, the outer steel bars of the steel bar structure are normally bound, and the inner steel bars are bound to the protection board (2) after the protection board (2) and the protection board support frame (6) are assembled.

9. The construction method of the lining structure according to claim 8, characterized in that, After the guard plate (2) and the guard plate support frame (6) are moved to the set position in the tunnel (5), the construction workers tie the tie bars for connecting the outer layer of steel bars and the inner layer of steel bars in sequence from one end of the guard plate (2) facing the inner side of the tunnel (5) to the other end of the guard plate (2) facing the outer side of the tunnel (5).

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