Construction method of open caisson type cooling tower and open caisson type cooling tower structure

Abstract

The present application relates to the technical field of subway engineering, and discloses a sinking well type cooling tower construction method, which comprises the following steps: S1, manufacturing a sinking well; S2, after the sinking degree of the sinking well, constructing a rotary jet pile; S3, laying a concrete cushion, constructing a cooling tower bottom plate and a pipe gallery passage bottom plate, and constructing a pipe gallery passage top plate; S4, excavating soil at the interface between the sinking well and a side wall of a wind pavilion; S5, removing a steel sealing door and a brick on the well wall, and constructing an interface bottom plate, an interface side wall and an interface top plate at the interface; S6, backfilling soil, constructing a cooling tower foundation and a stair column, constructing a stair plate, installing a cooling tower, and erecting a cooling tower roof; and a sinking well type cooling tower structure is also disclosed; the well wall of the sinking well serves as a side wall of the main body structure of the cooling tower, so that the enclosure structure can be saved, the construction efficiency of the cooling tower structure is improved, and the influence on the surrounding environment and the engineering cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of subway engineering technology, specifically to a construction method and structure of a caisson-type cooling tower. Background Technology

[0002] Current technology for constructing cooling towers in subway stations requires first establishing the retaining structure, then excavating the foundation pit in layers, constructing the internal support structure, and finally, after the foundation pit is excavated to the design bottom elevation, constructing the bottom slab, side walls, and top slab in sequence, and then dismantling the internal supports. This existing fence structure construction followed by dismantling results in long construction times, complex procedures, and high costs, leading to low construction efficiency, significant negative impacts on the surrounding environment, and the temporary retaining structure losing its value after the main structure is completed, thus causing project waste. A major reason why existing technology does not employ the caisson method is that caisson construction typically requires specialized construction teams or units with high levels of technical expertise, while most construction companies can perform conventional techniques, offering a wider selection of contractors. Summary of the Invention

[0003] To address the aforementioned problems in subway construction, this invention designs a caisson-type cooling tower structure and construction method, effectively improving the construction efficiency of the cooling tower structure and reducing the impact of construction on the surrounding environment. The specific technical solution is as follows:

[0004] A construction method for a caisson-type cooling tower structure includes the following steps:

[0005] S1. Manufacturing caissons;

[0006] S2. After the caisson is sunk to the preset depth, jet grouting piles are constructed at the interface between the caisson and the side wall of the ventilation shaft. The jet grouting piles must reach the preset depth.

[0007] S3. Lay a concrete cushion layer at the bottom of the caisson, construct the cooling tower base plate and the pipe gallery bottom plate on top of the concrete cushion layer, and construct the pipe gallery top plate above the pipe gallery bottom plate.

[0008] S4. Excavate the soil at the interface between the caisson and the ventilation shaft side wall to the preset depth of the foundation pit, wherein the foundation pit is set at the interface between the caisson and the ventilation shaft side wall and at the same horizontal height as the concrete cushion layer;

[0009] S5. Remove the steel sealing door and brickwork on the well wall, and construct the interface bottom plate, interface side wall and interface top plate at the interface between the caisson and the ventilation shaft side wall.

[0010] S6. Backfill the top of the top plate of the pipe gallery passage and the top plate of the interface with soil, construct the cooling tower foundation and stair columns on the cooling tower bottom plate, construct the stair slab between the cooling tower bottom plate and the stair columns, install the cooling tower on the cooling tower foundation, and erect the cooling tower canopy above the well wall and partition wall.

[0011] Furthermore, the caisson includes a cutting edge, a bottom longitudinal beam, a bottom transverse beam, and a caisson wall.

[0012] Preferably, the caisson is equipped with both a partition wall and a pipe gallery side wall, and the partition wall has a pre-drilled opening.

[0013] Preferably, the upper part of the caisson is provided with lateral and longitudinal supports.

[0014] Furthermore, before the caisson is lowered, a rectangular hole is reserved in the well wall on the interface side with the ventilation shaft side wall. The rectangular hole is filled with bricks, and the inside of the bricks is temporarily sealed with a steel sealing door.

[0015] Furthermore, in S5, the interface bottom plate, interface side wall, and interface top plate are connected to the ventilation shaft side wall via steel bar connectors.

[0016] This invention also discloses a caisson-type cooling tower structure, which is constructed by any of the methods described above. The caisson-type cooling tower structure includes a caisson, the caisson wall of which is fixed to the cutting edge by steel bars and sunk below the ground line. A "well" structure is provided between the cutting edges, consisting of longitudinal beams and transverse beams at the bottom of the caisson. A concrete pad is laid inside and on top of the "well" structure. A cooling tower base plate and a pipe gallery channel base plate are provided on top of the concrete pad. A partition wall is provided between the cooling tower base plate and the pipe gallery channel base plate, and the partition wall has an opening. A cooling tower foundation is provided on top of the cooling tower base plate, and a cooling tower is built on the cooling tower foundation. A pipe gallery channel is provided on the side of the partition wall opening near the side wall of the ventilation shaft, and an interface is also provided between the pipe gallery channel and the side wall of the ventilation shaft.

[0017] Preferably, a cooling tower canopy is installed between the upper end of the partition wall and the upper end of the well wall near the cooling tower.

[0018] Preferably, the cooling tower is connected to the partition wall via a stair slab, and the stair slab is connected to the cooling tower base plate and the ground via stair columns.

[0019] Preferably, the utility tunnel includes a floor slab, side walls, and a top slab; the interface includes a floor slab, side walls, and a top slab.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The construction method of this invention abandons the drawbacks of existing fence structures that require construction before demolition, and adopts an integrated molding caisson, which simplifies the process. At the same time, the caisson wall of this invention also serves as the side wall of the main structure of the cooling tower, saving on enclosure structure, significantly reducing construction costs, improving the construction efficiency of the cooling tower structure, and reducing the impact on the surrounding environment and project costs. Attached Figure Description

[0022] Figure 1 This is a structural plan view of the cooling tower for a caisson-type subway station according to the present invention.

[0023] Figure 2 This is a longitudinal section view of the structure in direction 1-1 of the present invention (caisson and jet grouting pile construction).

[0024] Figure 3 This is a longitudinal section view of the structure in direction 1-1 of the present invention (interface construction, internal structure construction).

[0025] In the diagram: 1. Well wall; 2. Cutting edge; 3. Longitudinal beam at the bottom of the caisson; 4. Horizontal beam at the bottom of the caisson; 5. Concrete cushion layer; 6. Cooling tower base plate; 7. Pipe gallery base plate; 8. Partition wall; 9. Cooling tower foundation; 10. Cooling tower; 11. Ventilation shaft side wall; 12. Cooling tower roof; 13. Stair slab; 14. Stair column; 15. Pipe gallery top plate; 16. Interface base plate; 17. Interface side wall; 18. Interface top plate; 19. Jet grouting pile; 20. Pit bottom; 21. Steel sealing door; 22. Bricklaying; 23. Pipe gallery side wall; 24. Horizontal support; 25. Longitudinal support; 26. Partition wall opening. Detailed Implementation

[0026] The present invention will be further described below through specific embodiments, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not depart from the basic idea of ​​the present invention, they are all within the protection scope of the present invention.

[0027] One embodiment provided by the present invention is as follows:

[0028] This invention discloses a construction method for a caisson-type cooling tower structure, comprising the following steps:

[0029] See Figure 1 S1. Manufacturing a caisson, which includes a cutting edge 2, a bottom longitudinal beam 3, a bottom transverse beam 4, and a caisson wall 1; a partition wall 8 and a pipe gallery passage side wall 23 are installed inside the caisson, and a partition wall opening 26 is reserved on the partition wall 8; a transverse support 24 and a longitudinal support 25 are provided on the upper part of the caisson to improve the overall rigidity of the caisson.

[0030] S2. Before the caisson sinks, a rectangular hole is reserved in the well wall 1 on the side of the ventilation shaft 11 where it meets the ventilation shaft side wall 11. The rectangular hole is filled with bricks 22, and the inside of the bricks 22 is temporarily sealed with steel sealing doors 21. After the caisson sinks to the preset depth, which is 5m-7m below the ground, jet grouting piles 19 are constructed at the interface between the caisson and the ventilation shaft side wall 11. The jet grouting piles 19 must reach the preset depth, which is 5m-7m below the ground, so as to serve both as a retaining wall and a water-stopping function.

[0031] See Figure 2 S3. Lay a concrete cushion layer 5 at the bottom of the caisson, construct the cooling tower bottom plate 6 and the pipe gallery bottom plate 7 on top of the concrete cushion layer 5, and construct the pipe gallery top plate 15 above the pipe gallery bottom plate 7.

[0032] S4. Excavate the soil at the interface between the caisson and the ventilation shaft side wall 11 to the preset depth of the foundation pit 20, which is 5m-7m below the ground. The foundation pit is set at the interface between the caisson and the ventilation shaft side wall 11 and is at the same horizontal height as the concrete cushion layer 5.

[0033] S5. Remove the steel sealing door 21 and brickwork 22 on the well wall 1. Construct the interface bottom plate 16, interface side wall 17 and interface top plate 18 at the interface between the caisson and the ventilation shaft side wall 11. The interface bottom plate 16, interface side wall 17 and interface top plate 18 are connected to the ventilation shaft side wall 11 through steel bar connectors.

[0034] See Figure 3 S6. Backfill soil on the top of the pipe gallery channel top plate 15 and the interface top plate 18. Construct the cooling tower foundation 9 and stair column 14 on the cooling tower bottom plate 6. Construct the stair slab 13 between the cooling tower bottom plate 6 and the stair column 14. Install the cooling tower 10 on the cooling tower foundation 9. Erect the cooling tower canopy 12 above the well wall 1 and the partition wall 8.

[0035] This invention also mentions a caisson-type cooling tower structure, which includes a caisson. The caisson wall 1 is connected and fixed to the cutting edge 2 by steel bars and is sunk below the ground line. A "well" structure is formed by longitudinal beams 3 and transverse beams 4 at the bottom of the caisson between the cutting edges 2. A concrete pad 5 is laid inside and on top of the "well" structure. A cooling tower base slab 6 and a pipe gallery passage base slab 7 are set on top of the concrete pad 5. A partition wall 8 is set between the cooling tower base slab 6 and the pipe gallery passage base slab 7. A partition wall opening 26 is set on the partition wall 8. A cooling tower foundation 9 is set on top of the cooling tower base slab 6. A cooling tower 10 is installed on the 9th floor. The cooling tower 10 is connected to the partition wall 8 via a stair slab 13. The stair slab 13 is connected to the cooling tower base plate 6 and the ground via stair columns 14, providing access for maintenance personnel. A cooling tower canopy 12 is installed between the upper end of the partition wall 8 and the upper end of the well wall 1 on the side near the cooling tower 10. A pipe gallery passage is provided on the side of the partition wall opening 26 near the ventilation shaft side wall 11. An interface is also provided between the pipe gallery passage and the ventilation shaft side wall 11. The pipe gallery passage includes a pipe gallery passage base plate 7, a pipe gallery passage side wall 23, and a pipe gallery passage top plate 15. The interface includes an interface base plate 16, an interface side wall 17, and an interface top plate 18.

[0036] The construction method of this invention abandons the drawbacks of existing fence structures that require construction before demolition, and adopts an integrated molding caisson, which simplifies the process. At the same time, the caisson wall of this invention also serves as the side wall of the main structure of the cooling tower, saving on enclosure structure, significantly reducing construction costs, improving the construction efficiency of the cooling tower structure, and reducing the impact on the surrounding environment and project costs.

[0037] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A construction method for a caisson-type cooling tower, characterized in that, Includes the following steps: S1. Manufacturing caissons; S2. After the caisson sinks to the preset depth, jet grouting piles (19) are constructed at the interface between the caisson and the side wall (11) of the ventilation shaft. The jet grouting piles (19) must reach the preset depth. S3. A partition wall (8) is set inside the caisson, a partition wall opening (26) is set on the partition wall (8), and a pipe gallery passage is set on the side of the partition wall opening (26) near the ventilation tower side wall (11); a concrete cushion layer (5) is laid at the bottom of the caisson, a cooling tower bottom plate (6) and a pipe gallery passage bottom plate (7) are constructed on the top of the concrete cushion layer (5), and a pipe gallery passage top plate (15) is constructed above the pipe gallery passage bottom plate (7); S4. Excavate the soil at the interface between the caisson and the ventilation shaft side wall (11) to the preset depth of the foundation pit (20). The foundation pit is set at the interface between the caisson and the ventilation shaft side wall (11) and at the same horizontal height as the concrete cushion layer (5). S5. Remove the steel sealing door (21) and brickwork (22) on the well wall (1), and construct the interface bottom plate (16), interface side wall (17) and interface top plate (18) at the interface between the caisson and the ventilation shaft side wall (11). S6. Backfill soil on the top of the pipe gallery channel top plate (15) and the interface top plate (18), construct the cooling tower foundation (9) and stair column (14) on the cooling tower bottom plate (6), construct the stair slab (13) between the cooling tower bottom plate (6) and the stair column (14), install the cooling tower (10) on the cooling tower foundation (9), and erect the cooling tower canopy (12) above the well wall (1) and the partition wall (8).

2. The construction method of a caisson-type cooling tower according to claim 1, characterized in that, The caisson includes a cutting edge (2), a bottom longitudinal beam (3), a bottom transverse beam (4), and a caisson wall (1).

3. The construction method of a caisson-type cooling tower according to claim 2, characterized in that, The caisson is also equipped with a pipe gallery side wall (23).

4. The construction method of a caisson-type cooling tower according to claim 2, characterized in that, The upper part of the caisson is provided with transverse support (24) and longitudinal support (25).

5. The construction method of a caisson-type cooling tower according to claim 1, characterized in that, Before the caisson is lowered, a rectangular hole is reserved in the well wall (1) on the interface side with the ventilation tower side wall (11). The rectangular hole is filled with bricks (22), and the inside of the bricks (22) is temporarily sealed with a steel sealing door (21).

6. The construction method of a caisson-type cooling tower according to claim 1, characterized in that, In S5, the interface bottom plate (16), interface side wall (17) and interface top plate (18) are connected to the ventilation shaft side wall (11) by a steel bar connector.

7. A caisson-type cooling tower structure constructed using the construction method described in claim 1, characterized in that, The caisson cooling tower structure includes a caisson. The caisson wall (1) is connected and fixed to the cutting edge (2) by steel bars and sunk below the ground line. A "well" structure is formed by the bottom longitudinal beam (3) and the bottom transverse beam (4) of the caisson between the cutting edges (2). A concrete pad (5) is laid inside and on top of the "well" structure. A cooling tower base plate (6) and a pipe gallery channel base plate (7) are set on top of the concrete pad (5). A partition wall (8) is set between the cooling tower base plate (6) and the pipe gallery channel base plate (7). A partition wall opening (26) is set on the partition wall (8). A cooling tower foundation (9) is set on top of the cooling tower base plate (6). A cooling tower (10) is set on the cooling tower foundation (9). A pipe gallery channel is set on the side of the partition wall opening (26) near the side wall (11) of the ventilation tower. An interface is also set between the pipe gallery channel and the side wall (11) of the ventilation tower.

8. The caisson cooling tower structure according to claim 7, characterized in that, A cooling tower canopy (12) is installed between the upper end of the partition wall (8) and the upper end of the well wall (1) on the side near the cooling tower (10).

9. The caisson-type cooling tower structure according to claim 7, characterized in that, The cooling tower (10) is connected to the partition wall (8) via a stair slab (13), and the stair slab (13) is connected to the cooling tower base plate (6) and the ground via a stair column (14).

10. The caisson cooling tower structure according to claim 7, characterized in that, The utility tunnel includes a base plate (7), side walls (23), and top plate (15); the interface includes a base plate (16), side walls (17), and top plate (18).

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