Tunnel engineering joint waterproof system

Abstract

The invention relates to a tunnel waterproof system, in particular to a tunnel engineering joint waterproof system which comprises a primary support layer, a secondary lining group is arranged in the primary support layer, a drainage plate is arranged between the primary support layer and the secondary lining group, and geotechnical cloth is adhered to the drainage plate. An inverted arch group is arranged in the second lining group, drainage ditches are arranged on the two sides of the inverted arch group, and the drainage ditches are arranged in the longitudinal direction of the primary support layer. The secondary lining group comprises a first pouring section secondary lining and a post pouring section secondary lining, the first pouring section secondary lining and the post pouring section secondary lining are longitudinally arranged along the primary support layer, a first connecting seam exists between the first pouring section secondary lining and the post pouring section secondary lining, a back-attached type water stop belt is arranged on the outer side of the first connecting seam, an expansion type water stop strip is arranged in the first connecting seam, and the expansion type water stop strip is connected with the first connecting seam. A high-ductility cement-based waterproof layer is arranged on the inner side of the first connecting seam; and the high-ductility cement-based waterproof layer is connected to the inner walls of the pre-pouring section secondary lining and the post-pouring section secondary lining. According to the invention, the problem of water leakage at the joint caused by only using a single water-stop belt can be solved.

Description

Technical Field

[0001] The invention relates to a tunnel waterproofing system, in particular to a tunnel engineering joint waterproofing system. Background Art

[0002] After the construction of underground tunnels, they will be under the pressure of groundwater for a long time. With the long-term pressure, most of the existing waterproof structures are fixed by applying a large amount of waterproof materials at the connection between the two supporting structures and using glue to fix the two together. However, as the tunnel is used for a longer time, the connection between the waterproof structure and the tunnel will break, causing the waterproof material to fall off, and then the water will continue to flow into the tunnel from the gap. The existing traditional flat plate structure waterstop has a poor sealing effect when dealing with deformation. Because the tunnel structure will inevitably deform to a certain extent during use, and the flat plate structure waterstop lacks sufficient flexibility and adaptability, it cannot effectively fill and seal the gaps caused by deformation. Summary of the invention

[0003] The purpose of the present invention is to provide a tunnel engineering joint waterproofing system, which solves the problem of poor waterproofing effect of the current waterproof structure.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: A tunnel engineering joint waterproofing system comprises a primary supporting layer, a secondary lining group is arranged in the primary supporting layer, a drainage board is arranged between the primary supporting layer and the secondary lining group, and a geotextile is bonded to the drainage board; an inverted arch group is arranged in the secondary lining group, drainage ditches are arranged on both sides of the inverted arch group, and the drainage ditches are arranged longitudinally along the primary supporting layer.

[0005] Furthermore, the secondary lining group includes a first-cast section second lining and a later-cast section second lining, the first-cast section second lining and the later-cast section second lining are arranged longitudinally along the primary support layer, there is a first connecting seam between the first-cast section second lining and the later-cast section second lining, a back-sticked waterstop is provided on the outside of the first connecting seam, an expansion waterstop strip is provided in the first connecting seam, and a high-ductility cement-based waterproof layer is provided on the inside of the first connecting seam; the high-ductility cement-based waterproof layer is connected to the inner walls of the first-cast section second lining and the later-cast section second lining.

[0006] Furthermore, the inverted arch group includes a first-cast inverted arch and a later-cast inverted arch, the first-cast inverted arch and the later-cast inverted arch are arranged longitudinally along the primary supporting layer, there is a second connecting seam between the first-cast inverted arch and the later-cast inverted arch, and an expansion water stop strip is provided in the second connecting seam.

[0007] Furthermore, the invert arch of the first cast section is located in the second lining of the first cast section, and the invert arch of the first cast section is distributed on both sides of the second lining of the first cast section; the invert arch of the post-cast section is located in the second lining of the post-cast section, and the invert arch of the post-cast section is distributed on both sides of the second lining of the post-cast section; there is a third connecting seam between the invert arch of the first cast section and the second lining of the first cast section, and there is also a third connecting seam between the invert arch of the post-cast section and the second lining of the post-cast section; an embedded galvanized steel plate waterstop is provided on the inner side of the third connecting seam.

[0008] Furthermore, a drainage pool is provided on the invert arch of the first cast section, and the drainage pool is arranged longitudinally along the primary supporting layer.

[0009] Furthermore, the second lining group is provided with an annular drainage pipe, which is attached to the inner wall of the primary supporting layer in a ring shape.

[0010] Furthermore, the second lining group is provided with longitudinal drainage pipes, which are located on both sides of the primary supporting layer and extend longitudinally along the primary supporting layer.

[0011] Furthermore, a transverse drainage pipe is provided on the second lining group, and the transverse drainage pipe passes from the inner side of the inverted arch group to the outer side of the second lining group, and two ports of the transverse drainage pipe are placed in the drainage pool.

[0012] Furthermore, the longitudinal drain pipe, the annular drain pipe and the transverse drain pipe respectively use porous water collecting drain pipes, and the porous water collecting drain pipe includes a main body, the main body is arc-shaped, a plurality of connecting ribs are arranged above the main body, and through holes are arranged between adjacent connecting ribs.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention adds a back-sticked waterstop strip on the outside of the first connection joint, an expansion waterstop strip is provided inside, and a high-ductility cement-based waterproof layer is provided inside, so as to prevent groundwater from penetrating into the interior through multi-layer waterproofing. In addition, an annular drainage pipe and a longitudinal drainage pipe are provided inside the primary support layer to quickly drain the groundwater that temporarily penetrates into the primary support layer. An expansion waterstop strip is added at the second connection joint to prevent groundwater from penetrating into the interior from the connection between the first-cast section invert arch and the second-cast section invert arch. An embedded galvanized steel plate waterstop strip is added at the third connection joint to prevent groundwater from penetrating into the interior from the connection between the invert arch and the second lining. The present invention can solve the problem of water leakage at the joint caused by using only a single waterstop strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a tunnel engineering joint waterproofing system.

[0015] Figure 2 This is a schematic diagram of the second lining group.

[0016] Figure 3 This is the front view of a tunnel engineering joint waterproofing system.

[0017] Figure 4 Schematic diagram of high ductility cement-based waterproof layer.

[0018] Figure 5 This is a schematic diagram of the porous water collection and drainage pipe structure.

[0019] Figure 6 Schematic diagram of the first connection seam.

[0020] Figure 7 Schematic diagram of the second connection seam.

[0021] Figure 8 This is a schematic diagram of the third connecting seam.

[0022] In the figure: 1. primary support layer; 2. secondary lining of first cast section; 3. transverse drainage pipe; 4. geotextile; 5. drainage board; 6. invert of first cast section; 7. drainage ditch; 8. circumferential drainage pipe; 9. longitudinal drainage pipe; 10. first connection joint; 11. high ductility cement-based waterproof layer; 13. embedded galvanized steel plate waterstop; 14. third connection joint; 15. expansion waterstop strip; 16. back-attached waterstop; 17. secondary lining of post-cast section; 18. invert of post-cast section; 19. second connection joint; 21. main body; 22. connecting ribs; 23. through hole. DETAILED DESCRIPTION

[0023] like Figures 1 to 4 As shown, a tunnel engineering joint waterproofing system includes a primary support layer 1, a secondary lining group is provided in the primary support layer 1, a drainage board 5 is provided between the primary support layer 1 and the secondary lining group, and a geotextile 4 is bonded to the drainage board 5; an inverted arch group is provided in the secondary lining group, and drainage ditches 7 are provided on both sides of the inverted arch group, and the drainage ditches 7 are arranged longitudinally along the primary support layer 1. The drainage board 5 can discharge part of the groundwater that has infiltrated into the primary support layer 1, thereby reducing the amount of groundwater infiltration. A geotextile 4 is bonded to the drainage board 5, and the geotextile 4 can absorb groundwater to prevent excessive groundwater from infiltrating into the interior.

[0024] like Figure 6As shown, the secondary lining group includes a first-casting section secondary lining 2 and a second-casting section secondary lining 17, the first-casting section secondary lining 2 and the second-casting section secondary lining 17 are arranged longitudinally along the primary support layer 1, and there is a first connection seam 10 between the first-casting section secondary lining 2 and the second-casting section secondary lining 17, a back-sticking water stop strip 16 is provided on the outside of the first connection seam 10, an expansion water stop strip 15 is provided in the first connection seam 10, and a high-ductility cement-based waterproof layer 11 is provided on the inside of the first connection seam 10; the high-ductility cement-based waterproof layer 11 is connected to the inner walls of the first-casting section secondary lining 2 and the second-casting section secondary lining 17. After groundwater penetrates into the inner side of the primary support layer 1, the back-sticking water stop strip 16 will seal the first connection seam 10 from the outside to prevent groundwater from penetrating into the first connection seam 10. As the first connection seam 10 deforms, groundwater enters the first connection seam 10, and the expansion water stop strip 15 will swell when it encounters water, quickly filling up the extra space generated by the deformation of the first connection seam 10, preventing groundwater from continuing to penetrate into the inside. In the initial stage of expansion of the expandable waterstop strip 15, some groundwater may enter the inner side of the first connection joint 10. The high-ductility cement-based waterproof layer 11 located on the inner side of the first connection joint 10 will completely absorb the groundwater to prevent the groundwater from penetrating into the interior.

[0025] like Figure 7 As shown, the inverted arch group includes a first-casting inverted arch 6 and a later-casting inverted arch 18, which are arranged longitudinally along the primary support layer 1. A second connection joint 19 is provided between the first-casting inverted arch 6 and the later-casting inverted arch 18, and an expansion type water stop strip 15 is provided in the second connection joint 19. The expansion type water stop strip 15 will expand when it encounters water, fill up the second connection joint 19, and prevent groundwater from entering the interior.

[0026] like Figure 8 As shown, the first-cast section inverted arch 6 is located in the first-cast section second lining 2, and the first-cast section inverted arch 6 is distributed on both sides of the first-cast section second lining 2; the back-cast section inverted arch 18 is located in the back-cast section second lining 17, and the back-cast section inverted arch 18 is distributed on both sides of the back-cast section second lining 17; there is a third connection seam 14 between the first-cast section inverted arch 6 and the first-cast section second lining 2, and there is also a third connection seam 14 between the back-cast section inverted arch 18 and the back-cast section second lining 17; the inner side of the third connection seam 14 is provided with a buried galvanized steel plate water stop 13. The buried galvanized steel plate water stop 13 is compressed or stretched between the concrete deformation joints, and plays a role of sealing and water stopping, preventing groundwater from entering the interior from the third connection seam 14.

[0027] like Figure 5As shown, the first cast section inverted arch 6 is provided with a drainage pool, and the drainage pool is arranged longitudinally along the primary support layer 1. The second lining group is provided with an annular drainage pipe 8, which is attached to the inner wall of the primary support layer in an annular shape. The second lining group is provided with a longitudinal drainage pipe 9, which is located on both sides of the primary support layer 1 and extends longitudinally along the primary support layer 1. The second lining group is provided with a transverse drainage pipe 3, which passes from the inner side of the inverted arch group to the outer side of the second lining group, and the two ports of the transverse drainage pipe 3 are placed at the drainage pool. The longitudinal drainage pipe 9, the annular drainage pipe 8 and the transverse drainage pipe 3 respectively use porous water collection drainage pipes, and the porous water collection drainage pipe includes a main body 21, which is arc-shaped, and a plurality of connecting ribs 22 are provided above the main body 21, and through holes 23 are provided between adjacent connecting ribs 22. An annular drain pipe 8 and a longitudinal drain pipe 9 are added inside the primary support layer 1, so that the groundwater that penetrates into the primary support layer 1 can be discharged out of the tunnel through the annular drain pipe 8, the longitudinal drain pipe 9 and the transverse drain pipe 3. The groundwater that enters the primary support layer 1 can enter the main body 21 through the through hole 23, and can collect groundwater from multiple directions. The longitudinal drain pipe 9, the annular drain pipe 8 and the transverse drain pipe 3 are interconnected through a tee. After the groundwater enters the longitudinal drain pipe 9, the groundwater will be discharged from the tunnel along the longitudinal drain pipe 9. After the groundwater enters the annular drain pipe 8, the groundwater will enter the drainage pool through the transverse drain pipe 3 along the annular drain pipe 8. After the groundwater enters the transverse drain pipe 3, the groundwater will be discharged from the tunnel along the drainage pool.

[0028] The specific construction steps are as follows: 1. Construction of the primary support layer First, the primary support layer is constructed by pouring concrete and laying drainage boards and geotextiles on its inner wall so that the subsequent drainage system construction can operate effectively and reduce groundwater infiltration. As the first support structure of the tunnel, the primary support layer ensures that it has sufficient strength and stability and provides a foundation for the subsequent waterproofing and drainage systems.

[0029] 2. Drainage system construction After the construction of the primary support layer is completed and reaches the designed strength, the drainage system is installed. An annular drainage pipe is installed on the inner wall of the primary support layer to ensure that its position matches the design of the invert and the drainage pool. The longitudinal drainage pipe is installed along the longitudinal direction of the primary support layer of the tunnel, so that the transverse drainage pipe penetrates along the inner side of the invert group to the outer side of the secondary lining group of the primary support layer. The transverse drainage pipe, the annular drainage pipe and the annular drainage pipe are interconnected through a tee to ensure that the groundwater can be effectively discharged from the tunnel. The drainage pipe adopts a porous water collection drainage pipe, which can fully collect the infiltrated groundwater and divert the water to the drainage pool to ensure that the drainage system is unobstructed. The drainage system is used to collect and discharge groundwater that has infiltrated the structure to prevent water accumulation from affecting the stability of the tunnel structure.

[0030] 3. Invert construction After the drainage system is completed, the invert arch at the bottom of the tunnel is constructed. The invert arch is cast at the bottom of the tunnel to ensure that its construction quality meets the design requirements. The invert arch is responsible for the waterproofing and load-bearing function of the tunnel bottom and is an important part of the tunnel structure. The embedded galvanized steel plate waterstop is pre-buried in the invert arch, and the expansion waterstop strip is installed to ensure that the joint between the invert arch and the secondary lining has good waterproof performance.

[0031] 4. Construction of the secondary lining group The secondary lining group is the main waterproof structure of the tunnel, which is divided into the first pouring section and the last pouring section. After the invert is completed, the second lining of the first pouring section is constructed to ensure that there are no gaps and water seepage points at the joints with the invert and the drainage system. After the second lining of the first pouring section is completed and reaches the designed strength, the second lining of the last pouring section is constructed, and the first connection seam is reserved for the installation of the expansion water stop strip to provide a complete waterproof barrier.

[0032] 5. Installation of waterproof components During the construction of the secondary lining, waterproof components are installed at the first joint to ensure the sealing of the first joint of the tunnel. Back-stick waterstop strips are installed on the outside of the first joint to ensure that they can provide effective waterproofing when the tunnel deforms or cracks. Inflatable waterstop strips are installed in the first joint, which can fill the joint after swelling in water to prevent further water penetration. After the construction of the secondary lining of the first and last pouring sections is completed, a high-ductility cement-based waterproof layer is sprayed to further enhance the waterproof effect and absorb the infiltrated water.

[0033] 6. Acceptance of waterproof system After all construction is completed, check the installation of water stop strips, expansion water stop strips and waterproof layers to ensure the normal operation of various waterproof measures. Inspect and accept the entire waterproof system, conduct a water pressure test to verify the waterproof performance of the system under water pressure and ensure there is no leakage. Check the drainage system to ensure that the drainage pipes are unobstructed and can effectively drain groundwater. Ensure that it meets the design requirements.

[0034] 7. Cleaning and Delivery After the acceptance is completed, the construction site will be cleaned up to ensure that the interior of the tunnel is clean and tidy, and prepare to put the project into use.

[0035] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A tunnel engineering joint waterproofing system, characterized in that: It comprises a primary supporting layer, wherein a secondary lining group is arranged in the primary supporting layer, a drainage board is arranged between the primary supporting layer and the secondary lining group, and a geotextile is bonded to the drainage board; an inverted arch group is arranged in the secondary lining group, drainage ditches are arranged on both sides of the inverted arch group, and the drainage ditches are arranged longitudinally along the primary supporting layer.

2. A tunnel engineering joint waterproofing system according to claim 1, characterized in that: The secondary lining group includes a first-cast section secondary lining and a later-cast section secondary lining, the first-cast section secondary lining and the later-cast section secondary lining are arranged longitudinally along the primary support layer, there is a first connecting seam between the first-cast section secondary lining and the later-cast section secondary lining, a back-sticked waterstop is provided on the outside of the first connecting seam, an expansion waterstop strip is provided in the first connecting seam, and a high-ductility cement-based waterproof layer is provided on the inside of the first connecting seam; the high-ductility cement-based waterproof layer is connected to the inner walls of the first-cast section secondary lining and the later-cast section secondary lining.

3. A tunnel engineering joint waterproofing system according to claim 2, characterized in that: The inverted arch group includes a first-cast inverted arch and a later-cast inverted arch, which are arranged longitudinally along the primary supporting layer. A second connecting seam is provided between the first-cast inverted arch and the later-cast inverted arch, and an expansion water stop strip is provided in the second connecting seam.

4. A tunnel engineering joint waterproofing system according to claim 3, characterized in that: The inverted arch of the first poured section is located in the second lining of the first poured section, and the inverted arch of the first poured section is distributed on both sides of the second lining of the first poured section; the inverted arch of the post-cast section is located in the second lining of the post-cast section, and the inverted arch of the post-cast section is distributed on both sides of the second lining of the post-cast section; there is a third connecting seam between the inverted arch of the first poured section and the second lining of the first poured section, and there is also a third connecting seam between the inverted arch of the post-cast section and the second lining of the post-cast section; an embedded galvanized steel plate waterstop is provided on the inner side of the third connecting seam.

5. A tunnel engineering joint waterproofing system according to claim 4, characterized in that: A drainage pool is provided on the invert of the first pouring section, and the drainage pool is arranged longitudinally along the primary supporting layer.

6. A tunnel engineering joint waterproofing system according to claim 5, characterized in that: The secondary lining group is provided with an annular drainage pipe, which is attached to the inner wall of the primary support layer in an annular shape.

7. A tunnel engineering joint waterproofing system according to claim 6, characterized in that: The secondary lining group is provided with longitudinal drainage pipes, which are located on both sides of the primary supporting layer and extend longitudinally along the primary supporting layer.

8. A tunnel engineering joint waterproofing system according to claim 7, characterized in that: The second lining group is provided with a transverse drainage pipe, which passes from the inner side of the inverted arch group to the outer side of the second lining group, and two ports of the transverse drainage pipe are placed in the drainage pool.

9. A tunnel engineering joint waterproofing system according to claim 8, characterized in that: The longitudinal drainage pipe, the annular drainage pipe and the transverse drainage pipe respectively use porous water collecting drainage pipes, and the porous water collecting drainage pipe includes a main body, which is arc-shaped, and a plurality of connecting ribs are arranged above the main body, and through holes are arranged between adjacent connecting ribs.

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