Tunnel waterproof board structure and construction method for tunnel waterproof board structure

Abstract

The present application discloses a tunnel waterproof board structure and a construction method for the tunnel waterproof board structure, the tunnel waterproof board structure comprises: a second layer of waterproof board is laid on the first layer of waterproof board and welded to form a circumferential weld, a first notch is provided at the right end of the circumferential weld of the first layer of waterproof board, and the first notch coincides with the circumferential weld along one side of the circumferential weld; a third layer of waterproof board is laid on the second layer of waterproof board in the longitudinal direction, the left end of the third layer of waterproof board extends out of the second layer of waterproof board and is laid on the first layer of waterproof board, and the length of the third layer of waterproof board laid on the first layer of waterproof board is greater than or equal to the length of the first notch; the third layer of waterproof board and the second layer of waterproof board and the third layer of waterproof board and the first layer of waterproof board are welded to form a longitudinal weld. The present application solves the problem in the related art that when the longitudinal construction joint of the waterproof board coincides with the circumferential construction joint, welding leakage is likely to occur due to the increase in welding thickness, and the welding cannot meet the waterproofing and drainage requirements.

Description

Technical Field

[0001] The present application relates to the field of tunnel engineering, and in particular to a tunnel waterproofing board structure and a construction method for the tunnel waterproofing board structure. Background Art

[0002] With the continuous development of my country's railway industry, the demand for railway construction is growing. The quality of tunnel waterproofing and drainage construction has a huge impact on the safety and stability of railway tunnels during operation. At present, tunnel projects often have various problems in actual operation. The sealing of tunnel waterproofing board construction and the firmness of weld position greatly affect the normal operation of tunnel drainage system. At the same time, waterproofing leakage is prone to occur. It is worth exploring the construction method used for welding multi-layer waterproofing boards to improve waterproof performance.

[0003] In the related technology, the construction of tunnel waterproofing board adopts the circumferential construction of the waterproofing board with the overlapped seams and arch wall staggered, and the overlap does not exceed 3 layers. When the longitudinal construction seam of the waterproofing board overlaps with the circumferential construction seam during welding, the problem of welding three layers of waterproofing board will occur. Due to the increase in welding thickness, leakage is prone to occur, and the welding cannot meet the drainage requirements.

[0004] Regarding the problem of welding three layers of waterproof boards when the longitudinal construction joint and the circumferential construction joint of the waterproof board overlap in the related technology, welding leakage is prone to occur due to the increase in welding thickness, and the welding cannot meet the drainage requirements. No effective solution has been proposed so far. Summary of the invention

[0005] The main purpose of the present application is to provide a tunnel waterproofing board structure and a construction method for the tunnel waterproofing board structure, so as to solve the problem of welding three layers of waterproofing boards when the longitudinal construction joints and the circumferential construction joints of the waterproofing boards overlap in the related technology. Due to the increase in welding thickness, welding leaks are prone to occur, and the welding cannot meet the drainage requirements.

[0006] In order to achieve the above-mentioned purpose, the present application provides a tunnel waterproof board structure, which includes: a circumferential waterproof board and a longitudinal waterproof board, the circumferential waterproof board includes a first layer of waterproof board and a second layer of waterproof board, and the longitudinal waterproof board includes a third layer of waterproof board; wherein, the second layer of waterproof board is laid on the first layer of waterproof board and welded to form a circumferential weld, and the first layer of waterproof board is provided with a first notch at the right end of the circumferential weld, and the first notch coincides with the circumferential weld along one side of the circumferential weld; the third layer of waterproof board is laid on the second layer of waterproof board in the longitudinal direction, and the left end of the third layer of waterproof board extends out of the second layer of waterproof board and is laid on the first layer of waterproof board, and the length of the third layer of waterproof board laid on the first layer of waterproof board is greater than or equal to the length of the first notch; the third layer of waterproof board and the second layer of waterproof board and the third layer of waterproof board and the first layer of waterproof board are welded to form a longitudinal weld, and the longitudinal weld passes through the first notch along one side of the circumferential weld.

[0007] Furthermore, the number of the circumferential weld and the longitudinal weld are both at least three.

[0008] Furthermore, a slope for the climbing welding machine to travel is arranged along one side of the first notch along the circumferential weld, and the first notch is arranged in an L shape.

[0009] Furthermore, a portion of the second layer of waterproofing board located at the left end of the circumferential weld is provided with a second L-shaped notch, and the first notch and the second notch are symmetrically arranged.

[0010] Furthermore, the width of the circumferential weld and the longitudinal weld is greater than or equal to 15 cm.

[0011] Furthermore, the length of one side of the first notch and the second notch along the circumferential weld is 25-35 cm.

[0012] According to another aspect of the present application, a construction method for a tunnel waterproofing board structure is provided, and the construction method for a tunnel waterproofing board structure comprises the following steps:

[0013] (1) Setting a circumferential waterproof board, specifically, placing one end of the second waterproof board on the first waterproof board, and welding with a climbing welding machine to form a circumferential weld;

[0014] (2) cutting a portion of the first layer of waterproofing board located at the right end of the circumferential weld to form a first notch, and making the first notch coincide with the circumferential weld along one side of the circumferential weld;

[0015] (3) providing a longitudinal waterproof board, specifically, laying a third layer of waterproof board on the second layer of waterproof board in the longitudinal direction, with the left end of the third layer of waterproof board extending beyond the second layer of waterproof board and laid on the first layer of waterproof board, and making the length of the third layer of waterproof board laid on the first layer of waterproof board greater than or equal to the length of the first notch;

[0016] (4) The overlapping parts of the third layer of waterproof board and the second layer of waterproof board, as well as the overlapping parts of the third layer of waterproof board and the first layer of waterproof board are welded longitudinally by a climbing welding machine to form a longitudinal weld. The longitudinal weld passes through the first notch along one side of the circumferential weld.

[0017] Furthermore, a slope for the climbing welding machine to travel is provided on one side of the first notch along the circumferential weld.

[0018] Furthermore, the first notch is cut into an L shape.

[0019] Furthermore, step (2) also includes: when waterproofing the downhill tunnel, the portion of the second layer of waterproofing board located at the left end of the circumferential weld is cut to form a second L-shaped notch, and the first notch and the second notch are symmetrically arranged.

[0020] Furthermore, the width of the circumferential weld and the longitudinal weld is greater than or equal to 15 cm.

[0021] In an embodiment of the present application, a circumferential waterproof board and a longitudinal waterproof board are provided, the circumferential waterproof board includes a first layer of waterproof board and a second layer of waterproof board, and the longitudinal waterproof board includes a third layer of waterproof board; wherein the second layer of waterproof board is laid on the first layer of waterproof board and welded to form a circumferential weld, a portion of the first layer of waterproof board located at the right end of the circumferential weld is provided with a first notch, and the first notch coincides with the circumferential weld along one side of the circumferential weld; the third layer of waterproof board is laid on the second layer of waterproof board longitudinally, the left end of the third layer of waterproof board extends out of the second layer of waterproof board and is laid on the first layer of waterproof board, and the length of the third layer of waterproof board laid on the first layer of waterproof board is greater than or equal to the length of the first notch; the third layer of waterproof board and the second layer of waterproof board and the third layer of waterproof board and the first layer of waterproof board are welded to form a longitudinal weld, and the longitudinal weld passes through the first notch along one side of the circumferential weld. The purpose of reducing the welding thickness at the welding point of the three-layer waterproof board is achieved, thereby realizing the technical effect of facilitating the welding of the three-layer waterproof board and making the welding firm, thereby solving the problem of welding the three-layer waterproof board when the longitudinal construction joint of the waterproof board and the circumferential construction joint overlap in the related technology. Due to the increase in welding thickness, welding leakage is prone to occur, and the welding cannot meet the drainage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0023] Figure 1 is a schematic diagram of the structure according to an embodiment of the present application;

[0024] Figure 2 is another structural schematic diagram according to an embodiment of the present application;

[0025] Among them, 1 is the first layer of waterproof board, 2 is the circumferential weld, 3 is the second layer of waterproof board, 4 is the unwelded part, 5 is the first notch, 6 is the longitudinal weld, 7 is the third layer of waterproof board, 8 is the welded part, and 9 is the second notch. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0028] In this application, the terms "upper", "lower", "inner", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0030] In addition, the terms "disposed", "provided with", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In addition, the term "plurality" shall mean two or more.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] like Figure 1 to Figure 2 As shown, an embodiment of the present application provides a tunnel waterproofing plate structure, which includes: an annular waterproofing plate and a longitudinal waterproofing plate, the annular waterproofing plate includes a first layer of waterproofing plate 1 and a second layer of waterproofing plate 3, and the longitudinal waterproofing plate includes a third layer of waterproofing plate 7; wherein the second layer of waterproofing plate 3 is laid on the first layer of waterproofing plate 1 and welded to form an annular weld 2, and a first notch 5 is provided at the portion of the first layer of waterproofing plate 1 located at the right end of the annular weld 2, and the first notch 5 coincides with the annular weld 2 along one side of the annular weld 2; the third layer of waterproofing plate 7 is laid on the second layer of waterproofing plate 3 in the longitudinal direction, and the left end of the third layer of waterproofing plate 7 extends out of the second layer of waterproofing plate 3 and is laid on the first layer of waterproofing plate 1, and the length of the third layer of waterproofing plate 7 laid on the first layer of waterproofing plate 1 is greater than or equal to the length of the first notch 5; the third layer of waterproofing plate 7 and the second layer of waterproofing plate 3 as well as the third layer of waterproofing plate 7 and the first layer of waterproofing plate 1 are welded to form a longitudinal weld 6, and the longitudinal weld 6 passes through the first notch 5 along one side of the annular weld 2.

[0034] In this embodiment, taking the direction of water flow from left to right as an example, the first layer of waterproof board 1 is located in the lower layer, and the second layer of waterproof board 3 is laid on the right side of the first layer of waterproof board 1, and is pressed down from the right to form an overlap area. The creeping welding machine is preheated, and the temperature is adjusted to 400° to weld the overlap area, and the weld width is not less than 15mm, so that the first layer of waterproof board 1 and the second layer of waterproof board 3 are welded and fixed, and a circumferential weld 2 is formed. The width of the circumferential weld 2 is smaller than the width of the overlap area, so there are unwelded parts 4 on both sides of the circumferential weld 2, and the first layer of waterproof board 1 and the second layer of waterproof board 3 overlap in the unwelded part 4. The thickness of the welded part 8 (i.e., the circumferential weld 2) is reduced after welding, that is, the thickness of the welded part 8 is smaller than the thickness of the unwelded part 4. When the waterproof board structure in the related art is adopted, the third layer of waterproof board 7 is placed on the first layer of waterproof board 1 and the second layer of waterproof board 3 which have been welded. The third layer of waterproof board 7 overlaps with both the unwelded part 4 and the welded part 8, resulting in a larger thickness of the unwelded part 4, which makes it difficult to weld it and easily causes welding leaks.

[0035] Therefore, in this embodiment, the structure of the second layer waterproof board 3 and the first layer waterproof board 1 that have been welded is adjusted. Specifically, a first notch 5 is opened in the portion of the first layer waterproof board 1 located at the right end of the circumferential weld 2, and the opening width of the first notch 5 is extended to the side of the circumferential weld 2, that is, the first notch 5 overlaps with the circumferential weld 2 along one side of the circumferential weld 2, and the first notch 5 can be opened in a square or L shape. After the first notch 5 is opened, the third layer waterproof board 7 is laid on the second layer waterproof board 3 and partially overlapped on the first notch 5. Due to the setting of the first notch 5 on the first layer waterproof board 1, only the second layer waterproof board 3 and the third layer waterproof board 7 need to be welded for the portion of the first notch 5, and for the portion of the circumferential weld 2, since the superimposed thickness of the first layer waterproof board 1 and the second layer waterproof board 3 becomes smaller after welding, even if the third layer waterproof board 7 overlaps on the circumferential weld 2, it can still be welded firmly.

[0036] To facilitate the opening of the first notch 5, the first notch 5 can be set to an L shape, and a 7-shaped knife is used to cut the first layer of waterproof board 1. The climbing welding machine welds the left bottom and the right high to ensure that the transverse waterproof board overlaps the upper side of the circumferential waterproof board. After the welding of the weld seam is completed, a well-shaped weld seam is ensured, and the welding is dense. To further facilitate the movement of the climbing welding machine, the first notch 5 is cut into a bevel along one side of the circumferential weld seam 2. To improve the firmness of the welding, the lateral weld seam and the longitudinal weld seam 6 are set to at least three.

[0037] like Figure 1 to Figure 2As shown, in view of the particularity of the tunnel structure, when waterproofing the downhill tunnel, the water flows downward, so it is necessary to firmly weld both sides of the circumferential weld 2, that is, it is necessary to open a second notch 9 on the left side of the circumferential weld 2. The second notch 9 is opened on the second waterproof board 3. The second notch 9 can also be set in an L shape, and the first notch 5 and the second notch 9 are symmetrically set. The width of the circumferential weld 2 and the longitudinal weld 6 is greater than or equal to 15 cm, and the length of one side of the first notch 5 and the second notch 9 along the circumferential weld 2 is 25-35 cm, preferably 30 cm.

[0038] According to another aspect of the present application, a construction method for a tunnel waterproofing board structure is provided, and the construction method for a tunnel waterproofing board structure comprises the following steps:

[0039] (1) Arranging a circumferential waterproof board, specifically, placing one end of the second waterproof board 3 on the first waterproof board 1, and welding by a climbing welding machine to form a circumferential weld 2;

[0040] (2) a portion of the first waterproof sheet 1 located at the right end of the circumferential weld 2 is cut to form a first notch 5, and the first notch 5 is made to overlap with the circumferential weld 2 along one side of the circumferential weld 2;

[0041] (3) a longitudinal waterproof board is provided, specifically, a third waterproof board 7 is longitudinally laid on the second waterproof board 3, the left end of the third waterproof board 7 extends out of the second waterproof board 3 and is laid on the first waterproof board 1, and the length of the third waterproof board 7 laid on the first waterproof board 1 is greater than or equal to the length of the first notch 5;

[0042] (4) The overlapping parts of the third waterproof board 7 and the second waterproof board 3, as well as the overlapping parts of the third waterproof board 7 and the first waterproof board 1 are welded longitudinally by a climbing welding machine to form a longitudinal weld 6. The longitudinal weld 6 passes through the first notch 5 and extends along one side of the circumferential weld 2.

[0043] In this embodiment, the construction requirements are:

[0044] (1) After the geotextile is hung, the waterproof board is hung in the same way. During the hanging process, the welding personnel on the working platform use electromagnetic welding machines to weld the hot melt gaskets to the waterproof board one by one. After the waterproof board is hung, the circumferential and longitudinal waterproof board joints are welded with a climbing welding machine. The weld width is ≥15cm. At least 60cm of overlap margin should be reserved at the edge of the waterproof board laid in sections. The waterproof board joints and lining construction joints are staggered by 1m-2m.

[0045] (2) The overlap width of the geotextile seams shall not be less than 15 cm. Generally, only circumferential joints are provided. When the length of the geotextile is insufficient, axial joints are provided to ensure that the upper geotextile (the one close to the arch) is pressed tightly against the lower geotextile (the one close to the bottom), and that the geotextile is in close contact with the base surface. The laid geotextile should be smooth, without bulges or wrinkles.

[0046] (3) The waterproof sheet should be laid in a circular manner from bottom to top, and the lower waterproof sheet must press the upper waterproof sheet. The laying should be done with appropriate tightness and a proper margin. After the waterproof sheet is laid, the surface should be inspected in time. If any damage is found, it should be repaired in time. The repair should be cut into a circular shape without any sharp feet such as triangles or quadrilaterals. The distance between the edge of the patch and the damaged edge should not be less than 7 cm. The patch should be fully welded without any curled or hollow parts. The patch should be tested for air leakage.

[0047] (4) The distance between the embedded parts and the waterproof board in the secondary lining shall not be less than 5cm.

[0048] (5) The waterproof sheet should be laid using a special trolley from the arch to the side walls on both sides. The lower waterproof sheet must press the upper waterproof sheet, and the laying tightness should be appropriate and leave a margin.

[0049] (6) The waterproof board should be fixed by using an electric hot press welder to heat-melt the geotextile thermoplastic gasket, so that the waterproof board and the thermoplastic gasket are melted and bonded together: the reinforced waterproof board can be lifted or squeezed by hand, and the waterproof board will not be stretched or damaged, so as to ensure that the concrete is closely attached to the initial support surface after pouring.

[0050] The overlap of waterproof sheets shall meet the following requirements:

[0051] ① The overlapping width of two waterproof boards should not be less than 15cm. The edges of the waterproof boards laid in sections should have an overlapping margin of at least 60cm, and the reserved edges should be effectively protected.

[0052] ② Parts that are difficult to weld with the heat sealing machine can be welded with a handheld welding gun to ensure the quality of the overlap.

[0053] ③The joints of the waterproof board should be staggered with the lining construction joints by 1.0 to 2.0m.

[0054] The welding of waterproof sheets shall meet the following requirements:

[0055] ① When welding, the joints must be scrubbed clean and the weld joints should be flat without bubbles, wrinkles or gaps.

[0056] ② Professionals should be responsible for the welding of waterproof panels to ensure the quality of the welds. The operators of hot welding machines should be professionally trained and relatively fixed.

[0057] ③ Before starting welding, test welding should be carried out on the plastic sheet to understand the welding temperature and speed.

[0058] ④. The welding of waterproof board should adopt double welds, and hot melt welding should be carried out by temperature and speed adjustable hot wedge automatic crawling heat sealing machine. Handheld welding torch can be used for detail processing or repair. The automatic crawling heat sealing machine has two control factors: "temperature" and "speed". When the temperature of welding wedge is high, the moving speed of welding machine should be fast; when the temperature of welding wedge is low, the moving speed of welding machine should be slow.

[0059] ⑤. The effective welding width of a single weld should not be less than 15mm.

[0060] When welding inside a hole, two waterproof boards should be laid and hung in position first, leaving 20 cm at each end. One person should straighten the waterproof boards at both ends about 50 cm in front of the welding machine, while another person should hold the welding machine 5 to 10 cm in the air from the base surface and move forward at a constant speed that has been adjusted. No pause should be allowed in the middle of the process, and the welding of the entire weld should be completed in one go.

[0061] In addition to normal construction, the longitudinal and circumferential overlaps of the waterproof board should be covered with a layer of waterproof board of the same material and welded by hot melt welding. When overlapping circumferentially, the lower waterproof board should press the upper waterproof board for welding.

[0062] If there are leaks or false welds in the weld, they should be repaired. If there are scorched areas, weld-through areas, and exposed fixing points, the weld must be covered with plastic sheets.

[0063] When laying waterproof boards in the auxiliary caverns, the waterproof boards should be processed according to the size and shape of the auxiliary caverns and welded to the side wall waterproof boards to form a whole. If the auxiliary caverns are not well formed, the same grade of concrete should be used to make the appearance smooth before laying the waterproof boards.

[0064] Furthermore, the first notch is provided with a slope for the climbing welding machine to walk along one side of the circumferential weld. The first notch is cut into an L shape, and step (2) also includes: when waterproofing the downhill tunnel, the portion of the second layer of waterproof board located at the left end of the circumferential weld is cut to form an L-shaped second notch, and the first notch and the second notch are symmetrically arranged. The width of the circumferential weld and the longitudinal weld is greater than or equal to 15 cm.

[0065] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Within the spirit and principle of the present application, any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A tunnel waterproofing board structure, characterized in that: include: An annular waterproof board and a longitudinal waterproof board, the annular waterproof board includes a first layer of waterproof board and a second layer of waterproof board, and the longitudinal waterproof board includes a third layer of waterproof board; wherein, The second layer of waterproof board is laid on the first layer of waterproof board and welded to form a circumferential weld, and a first notch is provided at a portion of the first layer of waterproof board located at the right end of the circumferential weld, and the first notch coincides with the circumferential weld along one side of the circumferential weld; The third layer of waterproof board is longitudinally laid on the second layer of waterproof board, the left end of the third layer of waterproof board extends out of the second layer of waterproof board and is laid on the first layer of waterproof board, and the length of the third layer of waterproof board laid on the first layer of waterproof board is greater than or equal to the length of the first notch; The third waterproof board and the second waterproof board as well as the third waterproof board and the first waterproof board are welded to form a longitudinal weld, and the longitudinal weld passes through the first notch along one side of the circumferential weld.

2. The tunnel waterproofing board structure according to claim 1, characterized in that: The number of the circumferential welds and the number of the longitudinal welds are both at least three.

3. The tunnel waterproofing board structure according to claim 2, characterized in that: The first notch is provided with a slope for the climbing welding machine to travel along one side of the circumferential weld, and the first notch is arranged in an L shape.

4. The tunnel waterproofing board structure according to any one of claims 1 to 3, characterized in that: A portion of the second waterproof plate located at the left end of the circumferential weld is provided with a second L-shaped notch, and the first notch and the second notch are symmetrically arranged.

5. The tunnel waterproofing board structure according to claim 4, characterized in that: The width of the circumferential weld and the longitudinal weld is greater than or equal to 15 cm.

6. The tunnel waterproofing board structure according to claim 5, characterized in that: The length of one side of the first notch and the second notch along the circumferential weld is 25-35 cm.

7. A construction method for a tunnel waterproofing board structure as claimed in any one of claims 1 to 3, 5 and 6, characterized in that: The steps include: (1) Setting up a circumferential waterproof board, specifically, placing one end of the second waterproof board on the first waterproof board, and welding it with a climbing welding machine to form a circumferential weld; (2) cutting a portion of the first waterproof sheet located at the right end of the circumferential weld to form a first notch, and making the first notch coincide with the circumferential weld along one side of the circumferential weld; (3) providing a longitudinal waterproof board, specifically, laying a third layer of waterproof board on the second layer of waterproof board in the longitudinal direction, with the left end of the third layer of waterproof board extending beyond the second layer of waterproof board and laid on the first layer of waterproof board, and making the length of the third layer of waterproof board laid on the first layer of waterproof board greater than or equal to the length of the first notch; (4) The overlapping parts of the third layer of waterproof board and the second layer of waterproof board, as well as the overlapping parts of the third layer of waterproof board and the first layer of waterproof board are welded longitudinally by a climbing welding machine to form a longitudinal weld. The longitudinal weld passes through the first notch and extends along one side of the circumferential weld.

8. The construction method for a tunnel waterproofing board structure according to claim 7, characterized in that: The first notch is provided with a slope along one side of the circumferential weld for the climbing welding machine to travel.

9. The construction method for a tunnel waterproofing board structure according to claim 8, characterized in that: The first notch is cut into an L shape.

10. The construction method for a tunnel waterproofing board structure according to claim 8, characterized in that: Step (2) also includes: when waterproofing the downhill tunnel, cutting the portion of the second layer of waterproofing board located at the left end of the circumferential weld to form an L-shaped second notch, and the first notch and the second notch are symmetrically arranged.

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