A shield underwater receiving device and receiving method

Abstract

The present invention relates to a shield underwater receiving device and receiving method. The receiving device is closed as a whole, and a cavity on one side is filled with low-strength plain concrete; the cavity on the other side is hollow, and a water intake head installation interface is arranged on the top wall of the cavity, and a partition wall is arranged between the two cavities. The partition wall and the side wall of the cavity on one side are respectively provided with a closed tunnel door structure that can be broken through by the shield equipment. The shield underwater receiving method described in the present invention first makes a receiving device in the land section, and floats and installs it to the end position of the shield excavation; after the shield equipment is excavated to the receiving device, the shield equipment is dismantled from the back to the front in sequence, and transported to the starting well of the land section for hoisting; finally, the water intake head structure is installed; this method effectively solves the problem of receiving and disassembling the shield equipment under the condition of no working well in the water area, and has high safety, simple operation, and little impact on the ecological environment of the water area. After the receiving device completes the shield reception, it can be used as the water intake head of the water intake tunnel, saving engineering investment.

Description

Technical Field

[0001] The invention relates to the field of tunnel underground engineering, and in particular to a receiving device and a receiving method for underwater shield equipment of a water intake tunnel constructed by a shield method. Background Art

[0002] With the development of the national economy, the construction of seawater desalination projects, hydropower station projects, and water plant projects has continued to emerge, and the number of underwater water intake tunnel projects such as submarine water intake tunnels and riverbed water intake tunnels has increased. After years of development, underwater shield tunnel technology has continued to mature and improve, but the problem of receiving and dismantling the shield in water for water intake tunnels is still a key technical problem that plagues engineering construction. Tunnels usually constructed by shield method need to set up working wells at the starting and ending points of excavation to complete the start, reception, and dismantling of the shield. For underwater traffic tunnels, construction from both sides to the sea can be completed by setting up underground disassembly caverns to complete the reception and disassembly of the shield, or the shield equipment for opposite excavation can be welded at the end of excavation, and the reception and disassembly of the shield can be completed under the protection of the shield. However, the water intake tunnel is quite different from the conventional traffic tunnel. It is completed by excavating from one side of the water area to the sea; therefore, it does not have the conditions for setting up a working well, and it is impossible to set up a disassembly cavern or complete the reception and disassembly of the shield under the protection of the shield.

[0003] At present, the construction methods available for receiving and dismantling shield equipment in water during the shield construction of water intake tunnels are limited and the construction is difficult. The existing technology adopts the method of filling cofferdams in the water area, using the cofferdams as working platforms, and dismantling the shield equipment after excavating from the bottom of the water to the cofferdam platform. However, the construction of cofferdams in the water area is huge, the investment is high, and it will damage the ecological environment of the water area; in addition, the newly filled cofferdam body is not consolidated, and the shield excavation construction in the newly filled cofferdam is risky. Summary of the invention

[0004] Based on the fact that during the existing shield construction of water intake tunnels, it is difficult to receive the shield equipment in water; and the shortcomings of large construction workload and high risk in the main shield receiving method of water area filling cofferdam method, the present invention provides a shield underwater receiving device, which can be directly prefabricated on land, and then floated and installed to the end point of the shield equipment excavation, thereby solving the shield receiving and disassembly problems in the absence of a working well in the water area.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a shield underwater receiving device, including a closed receiving box, wherein the receiving box is provided with a partition wall that can divide the inner cavity of the box into a first cavity and a second cavity; wherein:

[0006] The first cavity is hollow inside, a shield hollow derivation platform is provided on the bottom wall of the cavity, a water intake head installation interface is provided on the top wall, and a temporary blocking element is provided on the water intake head installation interface;

[0007] The interior of the second cavity is filled with low-strength plain concrete; the partition wall and the side wall of the second cavity opposite to the partition wall are respectively provided with closed tunnel door structures that can be excavated and broken by shield equipment.

[0008] In the above solution, the receiving box is a reinforced concrete structure.

[0009] Preferably, the closed portal structures arranged on the side walls and partition walls of the second cavity are annular, and the reinforcement used for the portal structure in the annular area is glass fiber reinforcement.

[0010] As a further preference, an annular water-stop curtain is pre-embedded around the annular area of ​​the closed portal structure arranged on the partition wall.

[0011] Furthermore, the longitudinal length of the second cavity is set to be 3 to 5 meters greater than the length of the main body of the shield equipment.

[0012] Furthermore, the clearance size of the closed portal structure is larger than the diameter of the shield equipment.

[0013] Preferably, the temporary blocking element provided on the water intake head mounting interface is a steel plate.

[0014] The present invention also provides a method for receiving water in a shield tunnel in water, which specifically comprises the following steps:

[0015] S1, prefabricate the shield underwater receiving device in the above technical solution;

[0016] S2, excavate an underwater foundation trench at a designated location on the sea (river) bed and lay a cushion layer;

[0017] S3, floating the receiving device completed in step S1 to a designated location, sinking it in the excavated foundation trench, and then backfilling the foundation trench with low-strength underwater concrete;

[0018] S4, the shield equipment starts from the starting well of the land section, excavates and breaks the closed portal structure on one side of the receiving device, passes through the second cavity, and performs secondary supplementary grouting behind the segment before breaking the partition wall to block the groundwater;

[0019] S5, excavation breaks through the closed portal structure on the partition wall, the shield equipment is pushed to the first cavity through the shield hollow guide platform, and then secondary supplementary grouting is carried out behind the segment to block the groundwater;

[0020] S6, dismantle the shield equipment from the back to the front, drag it back to the starting shaft on the land section and hoist it out;

[0021] S7, remove the blocking steel plate provided on the top wall of the first cavity of the receiving device, and install the water intake head structure at the water intake head installation interface.

[0022] Preferably, before step S7, the following steps are also included: removing the annular water-stop curtain on the partition wall and the shield empty deduction platform on the bottom wall of the first cavity, and constructing a ring beam structure for connecting the tunnel segment structure with the receiving device at the end of the water intake tunnel.

[0023] Compared with the prior art, the present invention has the following advantages and effects:

[0024] 1. The receiving device described in the present invention is closed as a whole, and the cavity on one side is filled with low-strength plain concrete to balance the water and soil pressure during shield excavation; the cavity on the other side is hollow, and a water intake head installation interface and a temporary blocking unit are arranged on the top wall of the cavity. When the shield equipment completes receiving and disassembling, the side cavity can be used as a water intake head, so that the receiving device described in the present invention not only effectively solves the receiving problem of the shield equipment in the water area, but also solves the installation problem of the water intake head of the water intake tunnel, which directly reduces the construction difficulty of the water intake tunnel and the overall construction volume of the project.

[0025] 2. In the underwater receiving method of the water intake tunnel shield described in the present invention, a closed receiving box is directly prefabricated on the land section, and installed to the end position of the shield excavation by floating and sinking; after the shield equipment is excavated into the inside of the receiving box, the disassembly process is completed from back to front, and finally it is transported to the starting well of the land section and hoisted out, and then the receiving and disassembly of the underwater shield machine of the water intake tunnel is realized, which effectively solves the problem of receiving and disassembling the shield equipment under the condition of no working well in the water area of ​​the existing water intake tunnel; at the same time, the cavity on one side of the receiving box is hollow, and a temporary blocking unit is provided on the top wall. When the shield equipment is received and disassembled, the temporary blocking unit is removed, and the water intake head structure is installed, and the overall receiving box can be used as the water intake head of the water intake tunnel, which reduces the amount of engineering construction to a certain extent and saves engineering investment.

[0026] 3. In the shield underwater receiving method for the water intake tunnel described in the present invention, after the shield equipment completes receiving and disassembly, a ring beam structure is set at the end of the water intake tunnel to rigidly connect the tunnel segment structure with the receiving device, thereby effectively ensuring the reliability of the connection between the receiving box body which also serves as the water intake head structure and the shield tunnel.

[0027] 4. The present invention completes the receiving and dismantling of the shield in water by setting a receiving device that can be directly prefabricated, which not only effectively solves the problem of receiving and dismantling the shield equipment when there is no working well in the middle of the water area; at the same time, it also avoids the damage to the water environment caused by the conventional method of filling cofferdams in the water area for shield receiving; and the receiving method described in the present invention has high safety and low construction difficulty. After the receiving device completes the shield receiving, it can be used as the water intake head of the water intake tunnel, saving engineering investment.

[0028] 5. The underwater receiving device and receiving method for the water intake tunnel shield described in the present invention are highly applicable and have good adaptability in both underwater soft strata and rock strata, and have no restrictions on the line selection and design of similar projects such as water intake tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a schematic diagram of the structure of the underwater receiving device of the shield machine according to an embodiment of the present invention.

[0031] Figure 2 It is a cross-sectional schematic diagram of the shield underwater receiving device according to an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the sinking and installation of the receiving device described in an embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the underwater reception of the shield machine according to an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the completion of the shield tunneling in water according to an embodiment of the present invention.

[0035] Explanation of reference numbers: 1. Receiving box; 3. Shield empty derivation platform; 4. Low-strength plain concrete; 5. Water intake head installation interface; 6. Partition wall; 7. Annular area; 71. Annular water-stop curtain; 8. Temporary blocking element; 9. Pad layer; 10. Low-strength underwater concrete; 11. First cavity; 12. Second cavity; 13. Water intake head structure; 14. Starting well; 15. Annular crown beam; 16. Foundation trench. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with embodiments. The following embodiments are for explanation of the present invention but the present invention is not limited to the following embodiments.

[0037] Example 1: Figures 1 to 2 As shown, a shield underwater receiving device includes a closed receiving box 1, wherein the receiving box 1 is provided with a partition wall 6 that can divide the inner cavity of the box into a first cavity 11 and a second cavity 12; wherein:

[0038] The first cavity 11 is hollow inside, and a shield hollow derivation platform 3 is provided on the bottom wall of the cavity. The shield hollow derivation platform 3 can also serve as a counterweight for the box body to prevent buoyancy. A water intake head mounting interface 5 is provided on the top wall of the first cavity 11, and a temporary blocking element 8 is provided on the water intake head mounting interface 5.

[0039] The interior of the second cavity 12 is filled with low-strength plain concrete 4; the partition wall 6 and the side wall of the second cavity 12 opposite to the partition wall 6 are respectively provided with closed tunnel door structures that can be excavated and broken by shield equipment.

[0040] Among them, Figure 1 , 2 As shown, in the shield underwater receiving device described in this embodiment 1, the receiving box 1 is made of reinforced concrete and can be directly prefabricated on the land section; the temporary blocking element 8 is a steel plate; the closed portal structure arranged on the partition wall 6 and the side wall of the second cavity is annular, and the reinforcement used for the portal structure in the annular area 7 is glass fiber reinforcement; preferably, an annular water-stop curtain 71 is embedded around the annular area 7 of the closed portal structure arranged on the partition wall 6.

[0041] Furthermore, if Figure 2 As shown, in this embodiment 1, in order to ensure that the shield equipment can smoothly advance from the shield tunnel to the second cavity 12 and the first cavity 11, the internal clearance of the closed portal structure on the side wall of the second cavity 12 and the partition wall 6 should be set to be larger than the diameter of the shield equipment; at the same time, in order to realize grouting and water stopping behind the shield segments of the water intake tunnel, the longitudinal length (tunnel excavation direction) of the second cavity 12 should be set to be 3-5m greater than the length of the shield main machine.

[0042] Example 2: Figures 1 to 5 As shown, a method for receiving water intake tunnel shield underwater includes the following steps:

[0043] S1, prefabricate the shield underwater receiving device described in Example 1 on the land section;

[0044] S2, excavating an underwater foundation trench 16 at a designated position on the sea (river) bed (i.e., the end position of the shield equipment excavation), and laying a cushion layer 9;

[0045] S3, such as Figure 3As shown, the receiving device completed in step S1 is floated to a designated location and sunk into the excavated foundation trench 16, and then the foundation trench 16 is backfilled with low-strength underwater concrete 10;

[0046] S4, such as Figure 4 As shown, the shield equipment starts from the starting well 14 of the land section, constructs the underwater shield tunnel, and excavates and breaks the closed portal structure on the side wall of the second cavity 12 in the receiving device, enters the second cavity, and performs secondary supplementary grouting behind the segment before breaking the partition wall 6 to block the groundwater;

[0047] S5, excavating and breaking the closed tunnel door structure on the partition wall 6, the shield equipment is pushed to the first cavity 11 through the shield push-through platform 3, and then secondary supplementary grouting is performed behind the segment to block the groundwater;

[0048] S6, dismantle the shield equipment from the back to the front, drag it back to the starting shaft 14 of the land section and hoist it out;

[0049] S7, such as Figure 5 As shown, the blocking steel plate provided on the top wall of the first cavity 11 of the receiving box is removed, and the water intake head structure 13 is installed at the water intake head installation interface 5 to complete the construction of the entire water intake tunnel.

[0050] In the underwater receiving method of the water intake tunnel shield described in Example 2, the receiving device can be directly prefabricated on the land section and floated and sunk to the end point of the shield equipment excavation, which effectively solves the problem of difficulty in constructing underwater working wells when the existing water intake tunnel shield equipment excavates from one side to the middle of the sea area; at the same time, after the shield equipment completes the receiving and disassembly process, the first cavity of the receiving device can also be used as the water intake head of the water intake tunnel, thereby effectively reducing the construction workload and saving project investment.

[0051] Example 3: Figures 1 to 5 As shown, a shield underwater receiving method for a water intake tunnel is different from Example 2 in that the following steps are included before step S7: removing the annular water-stop curtain 71 on the partition wall 6 and the shield empty derivation platform 3 on the bottom wall of the first cavity, and constructing a ring beam structure 15 for connecting the tunnel segment structure with the receiving box 1 at the end of the shield tunnel. The setting of the ring beam structure 15 effectively ensures the reliability of the connection between the receiving box that also serves as the water intake head and the shield tunnel.

[0052] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for receiving water intake tunnel shield underwater, characterized in that A shield underwater receiving device is used, the receiving device comprises a closed receiving box, the receiving box is provided with a partition wall which can divide the inner cavity of the box into a first cavity and a second cavity; wherein: The first cavity is hollow inside, a shield hollow derivation platform is provided on the bottom wall of the cavity, a water intake head installation interface is provided on the top wall, and a temporary blocking element is provided on the water intake head installation interface; The interior of the second cavity is filled with low-strength plain concrete; the partition wall and the side wall of the second cavity opposite to the partition wall are respectively provided with a closed tunnel door structure that can be excavated and broken by the shield equipment; The method for receiving water intake tunnel shield underwater comprises the following steps: S1, prefabricate the shield underwater receiving device; S2, excavate an underwater foundation trench at a designated location on the seabed or riverbed and lay a cushion layer; S3, floating the receiving device completed in step S1 to a designated location, sinking it in the excavated foundation trench, and then backfilling the foundation trench with low-strength underwater concrete; S4, the shield equipment starts from the starting well of the land section, excavates and breaks the closed portal structure on one side of the receiving device, passes through the second cavity, and performs secondary supplementary grouting behind the segment before breaking the partition wall to block the groundwater; S5, excavation breaks through the closed portal structure on the partition wall, the shield equipment is pushed to the first cavity through the shield hollow guide platform, and then secondary supplementary grouting is carried out behind the segment to block the groundwater; S6, dismantle the shield equipment from the back to the front, drag it back to the starting shaft on the land section and hoist it out; S7, remove the blocking steel plate provided on the top wall of the first cavity of the receiving device, and install the water intake head structure at the water intake head installation interface.

2. A method for receiving water intake tunnel shield underwater according to claim 1, characterized in that: The receiving box is a reinforced concrete structure.

3. A method for receiving water intake tunnel shield underwater according to claim 2, characterized in that: The closed portal structure arranged on the side wall and the partition wall of the second cavity is annular, and the reinforcement used for the portal structure in the annular area is glass fiber reinforcement.

4. A method for receiving water intake tunnel shield underwater according to claim 3, characterized in that: An annular water-stopping curtain is pre-buried around the annular area of ​​the closed tunnel structure on the partition wall.

5. The method for receiving water intake tunnel shield underwater according to claim 1, characterized in that: The longitudinal length of the second cavity is set to be 3 to 5 meters greater than the length of the shield equipment main body.

6. The method for receiving water intake tunnel shield underwater according to claim 1, characterized in that: The clearance size of the closed tunnel portal structure is greater than the diameter of the shield equipment.

7. The method for receiving water intake tunnel shield underwater according to claim 1, characterized in that: The temporary blocking element arranged on the water intake head installation interface is a steel plate.

8. A shield underwater receiving method for water intake tunnel according to any one of claims 1 to 7, characterized in that: Before step S7, the following steps are also included: removing the annular water-stop curtain on the partition wall and the shield empty derivation platform on the bottom wall of the first cavity, and constructing a ring beam structure for connecting the tunnel segment structure with the receiving device at the end of the water intake tunnel.

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