Repair structure for damaged secondary lattice of super-large-diameter steel cylinder cofferdam

Abstract

The utility model discloses a repairing structure for a damaged auxiliary lattice of a super-large-diameter steel cylinder cofferdam, which comprises two steel cylinder main lattices, a landside arc steel plate auxiliary lattice connected between the landsides of the two steel cylinder main lattices, a seaside arc steel plate auxiliary lattice connected between the seasides of the two steel cylinder main lattices, an inner retention wall, an outer retention wall and a water stop wall, a sand bag body and blow-filling sand. The inner retention wall is arranged close to the sea side of the landside arc steel plate secondary grid; the outer retention wall is arranged close to the land side of the seaside arc steel plate secondary grid; the water stopping wall is arranged in a seabed mud surface on the sea side of the outer water retaining wall; the sand bag bodies are stacked on a seabed mud surface in an area defined by the seaside of the outer retention wall and the seaside arc steel plate auxiliary grids; the hydraulic reclamation sand is arranged on the seabed mud surface in the area defined by the two steel cylinder main grids, the inner water retaining wall and the outer water retaining wall. According to the utility model, the auxiliary grids on the sea and land sides can be simultaneously repaired, and the problems that the cofferdam auxiliary grids are damaged due to extremely severe weather, so that a water stop cofferdam cannot be formed, and the subsequent land forming process cannot be carried out can be solved.

Description

Technical Field

[0001] The utility model relates to a hydraulic structure repair technology, in particular to a repair structure for a damaged auxiliary grid of an ultra-large diameter steel cylindrical cofferdam. Background Art

[0002] The ultra-large diameter steel cylindrical cofferdam rapid land construction technology is a technical means of rapid island enclosure and land construction that has appeared in China in the past decade. It can greatly reduce the island construction time and effectively control the construction cost.

[0003] The extra-large diameter steel cylinder cofferdam is composed of an extra-large diameter steel cylinder main grid and an arc-shaped steel plate sub-grid. The extra-large diameter steel cylinder main grid is first vibrated and sunk at a certain interval to form the main structure of the cofferdam. Subsequently, an arc-shaped steel plate sub-grid is inserted on the land side and the sea side between the two steel cylinder main grids to form a closed cofferdam structure.

[0004] Generally, after the super-large diameter steel cylinder main grid and the arc steel plate auxiliary grid are sunk, sand will be filled inside to ensure their stability. However, in the actual water construction process, extreme weather such as cold waves and typhoons may occur, resulting in the cofferdam structure having to face the severe wind and wave conditions under typhoon conditions before sand filling. Since the main grid itself is a complete cylindrical structure, it has strong rigidity and is not easy to be damaged, while the auxiliary grid has only a section of thin arc steel plate and poor rigidity, and is very easy to be damaged in the face of extremely severe sea conditions. After the auxiliary grid is damaged, the cofferdam structure cannot form a closed water-stop structure, and the work of enclosing the island cannot proceed smoothly. Under severe wave conditions, the sea side auxiliary grid is generally damaged first, which in turn causes further damage to the land side auxiliary grid, forming a water flow path that runs through the inside and outside. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a repair structure for damaged auxiliary grids of super-large diameter steel cylindrical cofferdams, which can realize the simultaneous repair of auxiliary grids on the sea and land sides, and can effectively solve the problem that the damaged auxiliary grids of super-large diameter steel cylindrical cofferdams cannot form a water-stop cofferdam due to damage caused by extremely severe weather, and the subsequent land formation process cannot be carried out.

[0006] A technical solution to achieve the purpose of the utility model is: a repair structure for a damaged auxiliary grid of an ultra-large diameter steel cylindrical cofferdam, comprising two adjacent steel cylindrical main grids, a land-side arc steel plate auxiliary grid connected between the land sides of the two steel cylindrical main grids, and a sea-side arc steel plate auxiliary grid connected between the sea sides of the two steel cylindrical main grids; the repair structure also includes an inner retaining wall, an outer retaining wall, a water stop wall, a sand bag body and blown fill sand; wherein,

[0007] The inner water retaining wall is arranged close to the sea side of the land side arc steel plate auxiliary grid, and the two sides of the inner water retaining wall are connected to the outer surfaces of the two steel cylinder main grids in a one-to-one correspondence; the top elevation of the inner water retaining wall is the same as the top elevation of the land side arc steel plate auxiliary grid;

[0008] The outer water retaining wall is arranged close to the land side of the sea side arc steel plate auxiliary grid, and the two sides of the outer water retaining wall are connected to the outer surfaces of the two steel cylinder main grids one by one; the top elevation of the outer water retaining wall is the same as the top elevation of the land side arc steel plate auxiliary grid;

[0009] The water stop wall is arranged in the seabed mud surface on the sea side of the outer water retaining wall, and the two sides of the water stop wall are connected to the outer surfaces of the two steel cylinder main grids in a one-to-one correspondence;

[0010] The sandbags are piled on the seabed mud surface in the area enclosed by the sea side of the outer retaining wall and the sea side arc steel plate auxiliary grid;

[0011] The blown fill sand is arranged on the seabed mud surface in the area surrounded by two steel cylinder main grids, the inner water retaining wall and the outer water retaining wall, and the top elevation of the blown fill sand is matched with the top elevation of the inner water retaining wall.

[0012] The above-mentioned repair structure of the damaged secondary grid of the super-large diameter steel cylindrical cofferdam, wherein the inner water retaining wall and the outer water retaining wall are both composed of U-shaped steel sheet piles and a limiting beam whose two ends are welded one-to-one to the upper outer surface of the two steel cylindrical main grids and rests on the back of the U-shaped steel sheet piles.

[0013] In the above-mentioned repair structure of the damaged sub-grid of the super-large diameter steel cylindrical cofferdam, the limiting beam is made of double-jointed channel steel.

[0014] In the above-mentioned repair structure of the damaged sub-grid of the super-large diameter steel cylindrical cofferdam, the water stop wall is composed of two rows of high-pressure jet grouting piles, and the top elevation of the water stop wall is level with the seabed mud surface.

[0015] The above-mentioned repair structure of the damaged secondary grid of the super-large diameter steel cylindrical cofferdam, wherein the repair structure also includes an anchoring mechanism, which includes an anchoring beam connected between the narrowest gap between the two steel cylindrical main grids and two groups of anchor rods connected one by one between the anchoring beam and the outer water retaining wall and between the anchoring beam and the inner water retaining wall.

[0016] The repair structure of the damaged auxiliary grid of the super-large diameter steel cylindrical cofferdam of the utility model has the following characteristics:

[0017] 1. An inner water retaining wall and an outer water retaining wall composed of a limit beam and U-shaped steel sheet piles are set on the sea side of the land side auxiliary grid and on the land side of the sea side auxiliary grid, which replace the land side auxiliary grid and the sea side auxiliary grid one by one, and a water stop wall composed of several rows of high-pressure jet grouting piles is set on the outside of the outer water retaining wall, which effectively improves the water stop effect of the cofferdam;

[0018] 2. The anchoring mechanism consisting of an anchoring beam and two groups of anchor rods is adopted. The dynamic balance between the sand filling and the anchor rod tensioning between the inner water retaining wall and the outer water retaining wall is ensured, and the dynamic balance between the sand filling and the cable tensioning between the inner water retaining wall and the outer water retaining wall is maintained, so that the deformation of the inner water retaining wall and the outer water retaining wall is ensured to be within a reasonable range, which can reduce the maximum bending moment of the U-shaped steel sheet pile, save the U-shaped steel sheet pile, and ensure the safety of the construction process;

[0019] 3. The utility model can realize the simultaneous repair of the sea and land side auxiliary grids, and can effectively solve the problem that the auxiliary grids of the super-large diameter steel cylindrical cofferdam cannot form a water-stop cofferdam due to damage due to extremely severe weather, and the subsequent land formation process cannot be carried out. It is of great significance to ensure the smooth construction of the super-large diameter steel cylindrical cofferdam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a plan view of the repair structure of the damaged auxiliary grid of the super-large diameter steel cylindrical cofferdam of the utility model;

[0021] Figure 2 yes Figure 1 AA view in . DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] See also Figure 1 and Figure 2 The utility model provides a repair structure for a damaged auxiliary grid of an ultra-large diameter steel cylindrical cofferdam, comprising two steel cylindrical main grids 1, a land-side arc steel plate auxiliary grid 21, a sea-side arc steel plate auxiliary grid 22, an inner water retaining wall 3, an outer water retaining wall 4, a water stop wall 5, a sand bag body 6, blown fill sand 7 and an anchoring mechanism.

[0024] Two steel cylinder main cells 1 are arranged adjacent to each other.

[0025] The land side arc steel plate auxiliary grid 21 is connected between the land sides of the two steel cylinder main grids 1 ; the sea side arc steel plate auxiliary grid 22 is connected between the sea sides of the two steel cylinder main grids 1 .

[0026] The inner water retaining wall 3 is arranged close to the sea side of the land side arc steel plate auxiliary grid 21, and the two sides of the inner water stop wall 3 are connected to the outer surfaces of the two steel cylindrical main grids 1 in a one-to-one correspondence; the top elevation of the inner water retaining wall 3 is the same as the top elevation of the land side arc steel plate auxiliary grid 21; the inner water retaining wall 3 is composed of U-shaped steel sheet piles 31 and a limiting beam 32 whose two ends are welded to the upper outer surfaces of the two steel cylindrical main grids 1 in a one-to-one correspondence and leaning against the sea side of the U-shaped steel sheet pile 31; the limiting beam 32 is made of double-jointed channel steel.

[0027] The outer water retaining wall 4 is arranged close to the land side of the sea side arc steel plate auxiliary grid 22, and the two sides of the outer water retaining wall 4 are connected to the outer surfaces of the two steel cylindrical main grids 1 in a one-to-one correspondence; the top elevation of the outer water retaining wall 4 is the same as the top elevation of the land side arc steel plate auxiliary grid 21; the outer water retaining wall 4 is composed of U-shaped steel sheet piles 31 and a limiting beam 32 whose two ends are welded to the upper outer surfaces of the two steel cylindrical main grids 1 in a one-to-one correspondence and leaning against the sea side of the U-shaped steel sheet pile 31; the limiting beam 32 is made of double-jointed channel steel.

[0028] The waterstop wall 5 is arranged in the seabed mud surface on the sea side of the outer water retaining wall 4, and the two sides of the waterstop wall 5 are connected to the outer surfaces of the two steel cylindrical main grids 1 in a one-to-one correspondence; the waterstop wall 5 is composed of two rows of high-pressure rotary jet piles, and the depth of the waterstop wall 5 driven into the seabed mud surface is greater than the depth of the U-shaped steel sheet piles 31 driven into the seabed mud surface, and the top elevation of the waterstop wall 5 is level with the seabed mud surface.

[0029] The sandbag body 6 is piled on the seabed mud surface in the area surrounded by the sea side of the outer retaining wall 4 and the sea side arc steel plate sub-grid 22; the sandbag body 6 is paved with multiple layers of filled sandbags.

[0030] The blown sand 7 is arranged on the seabed mud surface in the area surrounded by the two steel cylinder main grids 1 , the inner water retaining wall 3 and the outer water retaining wall 4 , and the top elevation of the blown sand 7 is matched with the top elevation of the inner water retaining wall 3 .

[0031] The anchoring mechanism includes an anchoring beam 81 connected between the narrowest gaps of the two steel cylindrical main grids 1 and two groups of anchor rods 82 connected one by one between the anchoring beam 81 and the outer water retaining wall 4 and between the anchoring beam 81 and the inner water retaining wall 3; the anchoring beam 81 is made of double-jointed H-shaped steel, and the anchor rods 82 are made of precision-rolled threaded steel bars.

[0032] The repair structure of the damaged sub-grid of the super-large diameter steel cylindrical cofferdam of the utility model is constructed according to the following steps:

[0033] (1) The limiting beams 32 of the inner water retaining wall 3 and the limiting beams 32 of the outer water retaining wall 4 are welded and installed: a limiting beam 32 is installed at the corresponding position of the inner water retaining wall 3 and the corresponding position of the outer water retaining wall 4, and the two ends of the two limiting beams 32 are welded to the two steel cylindrical main grids 1 in a one-to-one correspondence;

[0034] (2) Vibration sinking of the U-shaped steel sheet piles 31 of the inner water retaining wall 3 and the U-shaped steel sheet piles 31 of the outer water retaining wall 4: On the sea side of the limit beam 32 of the inner water retaining wall 3, a single U-shaped steel sheet pile is vibrated and sunk by a vibrating hammer. The first U-shaped steel sheet pile is vibrated and sunk near a U-shaped steel sheet pile, and the side of the first U-shaped steel sheet pile near the steel cylinder main grid 1 is welded to the steel cylinder main grid 1; then, the U-shaped steel sheet piles are vibrated and sunk in sequence. Before vibrating and sunk, the locking mouth of each U-shaped steel sheet pile is aligned with the locking mouth of the previous U-shaped steel sheet pile, and the vibrating sinker is inserted into the locking mouth of the previous U-shaped steel sheet pile to complete the connection of a row of U-shaped steel sheet piles 31; after the last U-shaped steel sheet pile near the steel cylinder main grid 1 on the other side is vibrated and sunk, the last U-shaped steel sheet pile is welded to the steel cylinder main grid 1 on the other side to form the inner water retaining wall 3; the U-shaped steel sheet piles 31 of the outer water retaining wall 4 are vibrated and sunk in the same manner.

[0035] (3) Welding and reinforcement of anchor beam 81: At the narrowest gap between the two steel cylinder main cells 1, the anchor beam 81 is horizontally welded, and the welding areas of the two ends of the anchor beam 81 on the two steel cylinder main cells 1 are reinforced by adding diagonal braces and pasting high-strength composite materials to prevent local damage to the wall surfaces of the two steel cylinder main cells 1;

[0036] (4) Installation of anchor rods 82: holes are drilled in the upper part of the U-shaped steel sheet piles 31 of the inner water retaining wall 3, the upper part of the U-shaped steel sheet piles 31 of the outer water retaining wall 4, and the upper part of the anchor beam 81, and a group of anchor rods 82 are respectively passed through between the holes of the U-shaped steel sheet piles 31 of the inner water retaining wall 3 and the holes of the anchor beam 81, and between the holes of the U-shaped steel sheet piles 31 of the outer water retaining wall 4 and the holes of the anchor beam 81, one end of the two groups of anchor rods 82 is anchored on the anchor beam 81 by anchors, and the other ends of the two groups of anchor rods 82 are temporarily anchored on the U-shaped steel sheet piles 31 of the outer water retaining wall 4 and the U-shaped steel sheet piles 31 of the inner water retaining wall 3 by anchors, waiting for the subsequent tensioning and locking operation;

[0037] (5) Construction of blown sand 7 and sandbags 6: Since the sea side is greatly affected by wind and wave loads, the U-shaped steel sheet pile wall 31 is prone to large deformation, which affects the subsequent construction quality. Therefore, the balance and stability of the blown sand on the sea and land sides of the outer retaining wall 4 should be maintained during construction. Considering the filling construction of the sandbags 6 and the tensioning and anchoring operations of the anchor rods, it is necessary to carry out the blowing of sand in the area surrounded by the two steel cylinder main grids 1, the inner water retaining wall 3 and the outer water retaining wall 4 in multiple times. The height of the first blowing of sand should be slightly higher than the height of the sandbags 6; the filling construction of the sandbags 6 and the first blowing of sand should be carried out at the same time as much as possible; at the same time, in order to prevent the loss of blown sand 7 before the construction of the water stop wall 5 (high-pressure rotary jet piles) is completed, rubber strips should be appropriately filled in the gap between the outer water retaining wall 4 and the two steel cylinder main grids 1 to stop leakage;

[0038] (6) Construction of water stop wall 5: After the construction of sand bag body 6 is completed, high pressure jet grouting piles are constructed to form a closed water stop system between the sea side arc steel plate auxiliary grid 22 and the outer water retaining wall 4;

[0039] (7) Dynamic construction of blowing sand 7 and anchor rod 82 tensioning: After the construction of the water stop wall 5 is completed, the secondary construction of blowing sand begins. At the same time, the anchors anchored on the U-shaped steel sheet piles 31 of the outer water retaining wall 4 and the anchors on the U-shaped steel sheet piles 31 of the inner water retaining wall 3 are released to tension the two groups of anchor rods 82. The tension stress and blowing sand will form opposite forces on the inner water retaining wall 3 and the outer water retaining wall 4 respectively. In order to prevent excessive deformation of the inner water retaining wall 3 and the outer water retaining wall 4, the dynamic balance of blowing sand and anchor rod 82 tensioning should be maintained during construction, the deformation of the inner water retaining wall 3 and the outer water retaining wall 4 should be monitored in time, the speed of blowing sand and the tensioning speed of anchor rod 82 should be reasonably controlled, and attention should be paid to the tensioning balance of the two groups of anchor rods 82 to prevent excessive deformation of the anchor beam 81.

[0040] (8) Locking the anchor rods 82: After the blown sand 7 reaches the specified elevation, the anchor rods 82 are tensioned and the two groups of anchor rods 82 are locked one by one on the U-shaped steel sheet piles 31 of the outer water retaining wall 4 and the U-shaped steel sheet piles 31 of the inner water retaining wall 3 using anchors.

[0041] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A repair structure for damaged secondary cells of an ultra-large diameter steel cylindrical cofferdam, comprising two adjacent steel cylindrical primary cells, a land-side arc steel plate secondary cell connected between the land sides of the two steel cylindrical primary cells, and a sea-side arc steel plate secondary cell connected between the sea sides of the two steel cylindrical primary cells; characterized in that: The repair structure also includes an inner retaining wall, an outer retaining wall, a water stop wall, a sand bag body and blown sand; The inner water retaining wall is arranged close to the sea side of the land side arc steel plate auxiliary grid, and the two sides of the inner water retaining wall are connected to the outer surfaces of the two steel cylindrical main grids in a one-to-one correspondence; the top elevation of the inner water retaining wall is the same as the top elevation of the land side arc steel plate auxiliary grid; The outer water retaining wall is arranged close to the land side of the sea side arc steel plate auxiliary grid, and the two sides of the outer water retaining wall are connected to the outer surfaces of the two steel cylindrical main grids in a one-to-one correspondence; the top elevation of the outer water retaining wall is the same as the top elevation of the land side arc steel plate auxiliary grid; The water stop wall is arranged in the seabed mud surface on the sea side of the outer retaining wall, and the two sides of the water stop wall are connected to the outer surfaces of the two steel cylindrical main cells in a one-to-one correspondence; The sandbags are stacked on the seabed mud surface in the area enclosed by the sea side of the outer retaining wall and the sea side arc steel plate sub-grid; The blown fill sand is arranged on the seabed mud surface in the area surrounded by the two steel cylinder main grids, the inner water retaining wall and the outer water retaining wall, and the top elevation of the blown fill sand is adapted to the top elevation of the inner water retaining wall.

2. The repair structure for damaged sub-grids of super-large diameter steel cylindrical cofferdams according to claim 1 is characterized in that: The inner and outer water retaining walls are both composed of U-shaped steel sheet piles and a limiting beam whose ends are welded one-to-one to the upper outer surfaces of two steel cylindrical main grids and rests on the back of the U-shaped steel sheet piles.

3. The repair structure for damaged sub-grids of super-large diameter steel cylindrical cofferdams according to claim 2 is characterized in that: The limiting beam is made of double-jointed channel steel.

4. The repair structure for damaged sub-grids of super-large diameter steel cylindrical cofferdams according to claim 1 is characterized in that: The water stop wall is composed of two rows of high-pressure jet grouting piles, and the top elevation of the water stop wall is level with the seabed mud surface.

5. The repair structure for damaged sub-grids of super-large diameter steel cylindrical cofferdams according to claim 1 is characterized in that: The repair structure also includes an anchoring mechanism, which includes an anchoring beam connected between the narrowest gaps of the two steel cylindrical main grids and two groups of anchor rods connected one-to-one between the anchoring beam and the outer water retaining wall and between the anchoring beam and the inner water retaining wall.

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