Deep water composite permanent water retaining support structure for lake bottom tunnel construction

Abstract

This invention discloses a deep-water composite permanent water-retaining support structure for lake-bottom tunnel construction, relating to the field of lake-bottom tunnel construction technology. It includes two sheet piles arranged side-by-side, with three connecting plates between them. Grooves are formed on both sides of each connecting plate, and a swing plate is hinged within each groove. The insertion positions of the first and second pile pins determine the placement positions of subsequent sheet piles. Therefore, if the distance between the two sheet piles needs to be adjusted, the positions of the first and second pile pins must be adjusted beforehand. First, the second pile pin is inserted deep into the lake-bottom soil. Then, the first pile pin is placed next to the adjacent second pile pin. A movable tube is then fitted onto the surface of the first pile pin, and the movable tube moves downwards until the insertion rod on the surface of the movable tube moves to the first through hole on the first pile pin, thereby limiting the movement of the movable tube.

Description

Technical Field

[0001] This invention relates to the field of lakebed tunnel construction technology, specifically to a deep-water composite permanent water-retaining support structure for lakebed tunnel construction. Background Technology

[0002] When constructing a lake-bottom tunnel, the traditional construction method involves using two rows of steel sheet piles with 4-6m of clay filling in between to form a temporary water-retaining structure. This structure only serves to prevent water from entering and to retain soil during the construction period. After the tunnel is completed, it is usually dismantled and recycled. After the lake water inside the cofferdam is drained and the silt at the bottom of the lake is cleared, it is necessary to separately drive pile foundations and jet grouting piles in the dry working face inside the cofferdam to serve as permanent support for both sides of the tunnel. Only after the permanent support construction is completed can the foundation pit be excavated and the main tunnel structure be poured, which will increase the overall construction period and compromise the structural safety. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a deep-water composite permanent water-retaining support structure for lake bottom tunnel construction.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a deep-water composite permanent water-retaining support structure for lakebed tunnel construction, comprising two sheet piles arranged side by side, three connecting plates shared between the two sheet piles, grooves on both sides of the connecting plates, swing plates hinged within the grooves, U-shaped blocks hinged to the side of the swing plates away from the connecting plates, movable pipes fixedly connected to the side of the U-shaped blocks away from the connecting plates, and first T-shaped plates fixedly connected to the side of the movable pipes near the sheet piles, three first T-shaped slots on corresponding sides of the two sheet piles, the first T-shaped plates being movably connected within adjacent first T-shaped slots.

[0005] Preferably, a number of fixing pipes are fixedly connected to the side of the steel sheet pile away from the connecting plate, and a second pile needle is provided through the inner cavity of each fixing pipe.

[0006] Preferably, each of the movable tubes has a first stake penetrating through its inner cavity, and each of the first stakes has a first through hole near its bottom. Each of the movable tubes has a second through hole on its front side, and each of the second through holes has a rod penetrating through it. The rear end of each rod penetrates through an adjacent first through hole, and each rod has a connecting plate fixedly connected to its front end.

[0007] Preferably, the bottom of the insertion rod is inclined near the rear side, and a first spring is sleeved on the outer edge of the insertion rod. The rear end of the first spring is fixedly connected to the outer edge of the movable tube, and the front end of the first spring is fixedly connected to the rear side of the connecting plate.

[0008] Preferably, each of the connecting plates has a first threaded hole at its center, and a threaded rod is threaded into each of the first threaded holes, with a fixed plate fixedly connected to the bottom end of each threaded rod.

[0009] Preferably, two long steel pipes are provided between the two sheet piles. The long steel pipes include a first steel pipe, a second steel pipe attached to the top of the first steel pipe, a third steel pipe attached to the top of the second steel pipe, and a fourth steel pipe attached to the top of the third steel pipe.

[0010] Preferably, four limiting plates are fixedly connected to the outer edge of the first steel pipe near the bottom. Each limiting plate has a second threaded hole. Four adjusting plates are fixedly connected to the outer edge of the first steel pipe near the top, the outer edge of the second steel pipe near the top and bottom, the outer edge of the third steel pipe near the top and bottom, and the outer edge of the fourth steel pipe near the bottom. Each adjusting plate has a third threaded hole. A bolt is threaded into two adjacent third threaded holes.

[0011] Preferably, the inner cavity of the fourth steel pipe is provided with four clamping plates near the top. Each clamping plate is fixedly connected to an L-shaped plate on the side away from the center of the fourth steel pipe. Each L-shaped plate is fixedly connected to a second spring on one side. The end of the second spring away from the L-shaped plate is fixedly connected to the outer edge of the fourth steel pipe.

[0012] Preferably, a first vertical plate is fixedly connected to the side of the sheet pile away from the connecting plate near the front side, and a second T-shaped groove is opened on each of the first vertical plates.

[0013] Preferably, a second vertical plate is fixedly connected to the side of the sheet pile away from the connecting plate near the rear side, and a second T-shaped plate is fixedly connected to the rear side of the second vertical plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes the interplay between sheet piles, a first pile pin, a long steel pipe, and a threaded rod to ensure that the insertion positions of the first and second pile pins determine the placement positions of subsequent sheet piles. Therefore, if the distance between two sheet piles needs adjustment, the positions of the first and second pile pins must be adjusted beforehand. First, the second pile pin is inserted deep into the lakebed soil. Then, the first pile pin is placed next to the adjacent second pile pin. Next, a movable tube is fitted over the surface of the first pile pin, and the movable tube moves downwards until the insertion rod on the movable tube reaches the first through hole on the first pile pin, thus aligning the movable tube... Limiting is performed by connecting the threaded rod to the drive mechanism. The drive mechanism drives the threaded rod to rotate, which in turn moves the connecting plate up and down. The connecting plate then moves the movable tube left and right, which in turn moves the first pile pin left and right via the insertion rod. Once the positions of the first and second pile pins are determined, both are inserted deep into the lakebed soil. The sheet pile is then moved downwards, and the fixing tube on the sheet pile is fitted onto the surface of the second pile pin. The first T-shaped plate on one side of the movable tube enters the first T-shaped groove on the sheet pile, thus completing the positioning and installation of the sheet pile and preventing it from tilting during installation. External equipment inserts sheet piles deep into the lakebed soil. After both rows of sheet piles are installed, the two middle first piles are removed. An underwater trenching device is used to excavate a trench in the middle area between the two rows of sheet piles. Simultaneously, bentonite slurry is continuously injected into the trench. The bentonite slurry has a higher density than lake water, approximately 1.05~1.15 g / cm³. The lateral pressure of the slurry is greater than the lateral pressure of the outer soil, acting as a liquid support to hold the trench walls and prevent soil collapse. A reinforcing cage is then placed between the two rows of sheet piles. After the reinforcing cage is stable, a long steel pipe is placed in the gaps within the cage. The long steel pipe, along with a limiting plate,... The hoisting mechanism is connected, and the steel pipe for pouring concrete is placed at the clamping plate on top of the fourth steel pipe. The four clamping plates, together with the L-shaped plate and the second spring, clamp and limit the steel pipe for pouring concrete. The concrete will enter the trench along the fourth, third, second, and first steel pipes. The concrete surface rises steadily, and the bottom of the long steel pipe is 30-50cm from the bottom of the trench. During the pouring process, the hoisting mechanism drives the long steel pipe to move upward, realizing simultaneous pouring and pulling. The length of the long steel pipe can be adjusted according to actual work needs. After the pouring is completed, the reinforced concrete continuous wall structure is formed, and the two sides of the wall are tightly bonded to the steel sheet piles on both sides to form an integral whole. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a top view of the steel sheet pile component of the present invention; Figure 3 This is a schematic diagram of the threaded rod structure of the component of the present invention; Figure 4This is an exploded view of the first pile needle of the component of this invention; Figure 5 This is a left view of the insertion rod of the component of the present invention; Figure 6 This is a diagram illustrating the installation of multiple steel sheet piles according to the present invention; Figure 7 This is a schematic diagram of the long steel pipe structure of the component of the present invention; Figure 8 This is a schematic diagram of the clamping plate structure of the component of the present invention; Figure 9 This is a schematic diagram of the second T-shaped plate structure of the component of the present invention.

[0016] Labels in the diagram: 1. Sheet pile; 2. Movable pipe; 3. First T-shaped plate; 4. First pile pin; 5. Fixed pipe; 6. Second pile pin; 7. Fixed plate; 8. Connecting plate; 9. Swinging plate; 10. U-shaped block; 11. Insert rod; 12. Connecting plate; 13. First spring; 14. First vertical plate; 15. Long steel pipe; 151. First steel pipe; 152. Second steel pipe; 153. Third steel pipe; 154. Fourth steel pipe; 155. Limiting plate; 156. Adjusting plate; 157. Bolt; 158. Clamping plate; 159. L-shaped plate; 1510. Second spring; 16. Second vertical plate; 17. Second T-shaped plate; 18. Threaded rod. Detailed Implementation

[0017] Please see Figure 1-9This invention provides a technical solution: a deep-water composite permanent water-retaining support structure for lakebed tunnel construction, comprising two sheet piles 1, arranged side-by-side, with three connecting plates 8 between them. Grooves are formed on both sides of the connecting plates 8, and swing plates 9 are hinged within each groove. A U-shaped block 10 is hinged to the side of the swing plate 9 away from the connecting plate 8. A movable pipe 2 is fixedly connected to the side of the U-shaped block 10 away from the connecting plate 8. A first T-shaped plate 3 is fixedly connected to the side of the movable pipe 2 closest to the sheet pile 1. Three first T-shaped slots are formed on corresponding sides of the two sheet piles 1, and the first T-shaped plates 3 are movably connected within adjacent first T-shaped slots. Several fixed pipes 5 are fixedly connected to the side of the sheet pile 1 away from the connecting plate 8. A second pile needle 6 penetrates the inner cavity of each fixed pipe 5. A first pile needle 4 penetrates the inner cavity of each movable pipe 2. A first pile needle 4 is formed near the bottom of the inner cavity of each first pile needle 4. A second through hole is provided on the front side of the movable tube 2. A rod 11 is inserted through the second through hole. The rear end of the rod 11 passes through the adjacent first through hole. A connecting plate 12 is fixedly connected to the front end of the rod 11. The bottom of the rod 11 is inclined near the rear side. A first spring 13 is sleeved on the outer edge of the rod 11. The rear end of the first spring 13 is fixedly connected to the outer edge of the movable tube 2. The front end of the first spring 13 is fixedly connected to the rear side of the connecting plate 12. A first threaded hole is provided at the center of the connecting plate 8. A threaded rod 18 is threadedly connected in the first threaded hole. A fixed plate 7 is fixedly connected to the bottom end of the threaded rod 18. A first vertical plate 14 is fixedly connected to the side of the steel sheet pile 1 away from the connecting plate 8 near the front side. A second T-slot is provided on the first vertical plate 14. A second vertical plate 16 is fixedly connected to the side of the steel sheet pile 1 away from the connecting plate 8 near the rear side. A second T-slot 17 is fixedly connected to the rear side of the second vertical plate 16. Two long steel pipes 15 are provided between the two sheet piles 1. The long steel pipe 15 includes a first steel pipe 151, a second steel pipe 152 attached to the top of the first steel pipe 151, a third steel pipe 153 attached to the top of the second steel pipe 152, and a fourth steel pipe 154 attached to the top of the third steel pipe 153. Four limiting plates 155 are fixedly connected to the outer edge of the first steel pipe 151 near the bottom. Each limiting plate 155 has a second threaded hole. The outer edges of the first steel pipe 151 near the top, the outer edges of the second steel pipe 152 near the top and bottom, and the outer edges of the third steel pipe 153 near the bottom are fixedly connected to the fourth steel pipe 154. Four adjusting plates 156 are fixedly connected to the top and bottom, and to the outer edge of the fourth steel pipe 154 near the bottom. Each adjusting plate 156 has a third threaded hole. Two adjacent third threaded holes are connected to a bolt 157 by a common thread. Four clamping plates 158 are provided in the inner cavity of the fourth steel pipe 154 near the top. An L-shaped plate 159 is fixedly connected to the side of the clamping plate 158 away from the center of the fourth steel pipe 154. A second spring 1510 is fixedly connected to one side of the L-shaped plate 159. The end of the second spring 1510 away from the L-shaped plate 159 is fixedly connected to the outer edge of the fourth steel pipe 154.

[0018] Working principle: During construction, the insertion positions of the first pile 4 and the second pile 6 are the placement positions of the subsequent sheet piles 1. Therefore, if it is necessary to adjust the distance between the two sheet piles 1, the positions of the first pile 4 and the second pile 6 need to be adjusted in advance. First, the second pile 6 is inserted deep into the lake bottom soil. Then, the first pile 4 is placed on the side of the adjacent second pile 6. Then, the movable tube 2 is fitted onto the surface of the first pile 4. The movable tube 2 moves downward on the surface of the first pile 4 until the insertion rod 11 on the surface of the movable tube 2 moves to the first through hole on the first pile 4, thereby limiting the movable tube 2. At this time, the threaded rod 18 is connected to the drive mechanism. The drive mechanism drives the threaded rod 18 to rotate. The threaded rod 18 drives the connecting plate 8 to move up and down. The connecting plate 8 drives the swing plate 9 to swing. The swing plate 9 drives the movable tube 2 to move left and right through the U-shaped block 10. The movable tube 2 drives the first pile 4 to move left and right through the insertion rod 11. When the positions of the first pile 4 and the second pile 6 are... Once determined, the first pile 4 and the second pile 6 are both inserted deep into the lakebed soil. Then, the sheet pile 1 is moved downwards, and the fixing tube 5 on the sheet pile 1 is fitted onto the surface of the second pile 6. The first T-shaped plate 3 on one side of the movable tube 2 enters the first T-shaped groove on the sheet pile 1, thus completing the positioning and installation of the sheet pile 1 and preventing it from tilting during installation. The sheet pile 1 is then inserted deep into the lakebed soil using external instruments. After both rows of sheet piles 1 are installed, the threaded rod in the middle is moved upwards. 18. The threaded rod 18 in the middle drives the intermediate connecting plate 8, the intermediate swing plate 9, the intermediate U-shaped block 10 and the intermediate movable tube 2 to move upward through the intermediate fixed plate 7. The intermediate movable tube 2 drives the intermediate first pile pin 4 to move upward through the intermediate insert rod 11. The two intermediate first pile pins 4 are disassembled. In the middle area between the two rows of steel sheet piles 1, an underwater trenching device is used to excavate a trench. While excavating the trench, bentonite slurry is continuously injected into the trench. The density of the bentonite slurry is greater than that of lake water, about 1.05~1.The lateral pressure of the mud is 15g / cm³, which is greater than the lateral pressure of the outer soil, acting as a liquid support to hold the trench wall in place and prevent the soil from collapsing. The reinforcing cage is then placed between the two rows of sheet piles 1. After the reinforcing cage is stable, the long steel pipe 15 is placed in the gap of the reinforcing cage. The long steel pipe 15, together with the limiting plate 155, is connected to the hoisting mechanism. The steel pipe with the cast concrete is placed at the clamping plate 158 at the top of the fourth steel pipe 154. The four clamping plates 158, together with the L-shaped plate 159 and the second spring 151, form a powerful combination. 0. The steel pipes for pouring concrete are clamped and limited. The concrete will flow into the trench along the fourth steel pipe 154, the third steel pipe 153, the second steel pipe 152, and the first steel pipe 151. The concrete surface rises steadily, and the bottom of the long steel pipe 15 is 30-50cm from the bottom of the trench. During the pouring process, the hoisting mechanism moves the long steel pipe 15 upward, achieving simultaneous pouring and pulling. During the upward movement, the second steel pipe 152 or the third steel pipe 153 can be disassembled by rotating bolt 1. 57 is sufficient, thus ensuring that the bottom end of the long steel pipe 15, i.e., the first steel pipe 151, remains buried in the cement. After casting to the top, the long steel pipe 15 is completely pulled out. The length of the long steel pipe 15 can be adjusted according to actual work needs, with the addition of a second steel pipe 152 and a third steel pipe 153. After casting, the reinforced concrete continuous wall structure is formed, and the two sides of the wall are tightly bonded to the two side steel sheet piles 1, forming a whole. If it is necessary to connect multiple steel sheet piles 1, the second T-shaped plate 17 on the rear side of another steel sheet pile 1 is moved to the second T-shaped groove in the first vertical plate 14 on the front side of one of the steel sheet piles 1, thereby completing the connection and installation of multiple steel sheet piles 1. After each section of the trench is excavated and the subsequent reinforced concrete continuous wall is formed, the remaining first pile needle 4 can be disassembled, and the threaded rod 18 is moved upward. The threaded rod 18, in conjunction with the connecting plate 8, the swing plate 9, the movable pipe 2, and the insertion rod 11, drives the first pile needle 4 upward, allowing construction of the next section of the trench to proceed.

Claims

1. A deep-water composite permanent water-retaining support structure for lakebed tunnel construction, comprising two steel sheet piles (1), characterized in that: Two sheet piles (1) are arranged side to side, and three connecting plates (8) are provided between the two sheet piles (1). The connecting plates (8) have grooves on both sides, and swing plates (9) are hinged in the grooves. U-shaped blocks (10) are hinged on the side of the swing plates (9) away from the connecting plates (8). Movable tubes (2) are fixedly connected on the side of the U-shaped blocks (10) away from the connecting plates (8). First T-shaped plates (3) are fixedly connected on the side of the movable tubes (2) close to the sheet piles (1). Three first T-shaped slots are provided on the corresponding side of the two sheet piles (1). The first T-shaped plates (3) are movably connected in the adjacent first T-shaped slots.

2. The deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 1, characterized in that: The sheet pile (1) is fixedly connected to several fixed pipes (5) on the side away from the connecting plate (8), and the inner cavity of each fixed pipe (5) is provided with a second pile needle (6).

3. The deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 1, characterized in that: The inner cavity of each movable tube (2) is provided with a first pile needle (4), and the inner cavity of each first pile needle (4) is provided with a first through hole near the bottom. The front side of each movable tube (2) is provided with a second through hole, and a rod (11) is provided through each second through hole. The rear end of the rod (11) passes through the adjacent first through hole, and the front end of the rod (11) is fixedly connected to a connecting plate (12).

4. The deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 3, characterized in that: The bottom of the insertion rod (11) is inclined near the rear side. The outer edge of the insertion rod (11) is fitted with a first spring (13). The rear end of the first spring (13) is fixedly connected to the outer edge of the movable tube (2), and the front end of the first spring (13) is fixedly connected to the rear side of the connecting plate (12).

5. The deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 1, characterized in that: Each of the connecting plates (8) has a first threaded hole at its center, and each of the first threaded holes is threaded with a threaded rod (18), and each of the threaded rods (18) is fixedly connected to a fixed plate (7) at its bottom end.

6. The deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 1, characterized in that: Two long steel pipes (15) are provided between the two sheet piles (1). The long steel pipes (15) include a first steel pipe (151), a second steel pipe (152) attached to the top of the first steel pipe (151), a third steel pipe (153) attached to the top of the second steel pipe (152), and a fourth steel pipe (154) attached to the top of the third steel pipe (153).

7. The deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 6, characterized in that: Four limiting plates (155) are fixedly connected to the outer edge of the first steel pipe (151) near the bottom. Each limiting plate (155) has a second threaded hole. Four adjusting plates (156) are fixedly connected to the outer edge of the first steel pipe (151) near the top, the outer edge of the second steel pipe (152) near the top and bottom, the outer edge of the third steel pipe (153) near the top and bottom, and the outer edge of the fourth steel pipe (154) near the bottom. Each adjusting plate (156) has a third threaded hole. A bolt (157) is threaded into two adjacent third threaded holes.

8. A deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 7, characterized in that: The inner cavity of the fourth steel pipe (154) is provided with four clamping plates (158) near the top. Each clamping plate (158) is fixedly connected to an L-shaped plate (159) on the side away from the center of the fourth steel pipe (154). Each L-shaped plate (159) is fixedly connected to a second spring (1510) on one side. The end of the second spring (1510) away from the L-shaped plate (159) is fixedly connected to the outer edge of the fourth steel pipe (154).

9. A deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 1, characterized in that: The sheet pile (1) is fixedly connected to a first vertical plate (14) on the side away from the connecting plate (8) near the front side, and a second T-shaped groove is opened on the first vertical plate (14).

10. A deep-water composite permanent water-retaining support structure for lakebed tunnel construction according to claim 1, characterized in that: The sheet pile (1) is fixedly connected to a second vertical plate (16) on the side away from the connecting plate (8) near the rear side, and a second T-shaped plate (17) is fixedly connected to the rear side of the second vertical plate (16).

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