Construction method for increasing the rigidity of the shaft wall of a spiral caisson

Abstract

The application discloses a construction method for increasing the rigidity of a shaft wall of a spiral flow well, and relates to the technical field of spiral flow well shaft construction. The application sets a reinforcing belt in the shaft wall of the spiral flow well, and pre-buried parts are arranged at intervals on the inner surface of the reinforcing belt; inner supports are sequentially connected with the pre-buried parts through welding, so that a combined double-steel-mix support reinforcing system is formed. The reinforcing belt is similar to a hidden beam, and on the basis of the original circumferential steel bars of the shaft wall, circumferential reinforcing bars and stirrups are added to increase the rigidity of the reinforcing belt; and the inner supports are regular polygons which are sequentially connected and are reasonable and balanced in stress.

Description

Technical Field

[0001] This invention relates to the field of vortex well caisson construction technology, and in particular to a construction method for increasing the rigidity of the vortex well caisson wall. Background Technology

[0002] In the field of metallurgical construction, vortex wells are important structures, indispensable as auxiliary water systems in steel rolling and steelmaking processes. Vortex wells are generally cylindrical reinforced concrete structures with a large diameter (approximately 18-35 meters), thick walls (1-2 meters), and deep burial depth (approximately 20-35 meters), making them a key and challenging aspect of construction. Depending on soil conditions, groundwater levels, and surrounding working conditions, common construction methods include open excavation, reverse construction, and caisson methods, with the caisson method being relatively more prevalent. The basic principle of the caisson method is to divide the vortex well wall into several sections and pour them separately, each section being approximately 5-8 meters high. After the concrete wall reaches a certain strength, it begins to sink in stages. As the wall gradually sinks, the lateral pressure of the soil on the wall increases, especially in silt and fine sand layers where there is almost no cohesion; the vortex well wall alone resists the lateral pressure. To prevent excessive lateral pressure from causing damage to the cylinder wall and to enhance the rigidity of the cylinder wall itself, a device and construction method for increasing the rigidity of the cylinder wall are invented. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a construction method for increasing the rigidity of the vortex well caisson wall. By setting reinforcing strips and internal supports, the overall strength, rigidity, and stability of the caisson wall are improved.

[0004] To achieve this technical objective, the present invention adopts the following solution: The construction method for increasing the rigidity of the vortex well caisson wall includes the following steps: S1. A reinforcing strip is added to the lowest section of the cylindrical wall of the vortex well; S2. Embedded internal support parts are evenly arranged on the inner side of the reinforcing strip, and anchor bars are set on the back of the embedded parts. S3. When the cylinder wall caisson is sunk to 90~110cm from the ground, install the internal support: connect the internal support to the embedded parts in sequence to form a polygonal support system. S4. An inclined support connecting rod is installed in the middle of the inner support, and the connecting rod is connected to the embedded part. S5. Continue sinking the caisson. After it has sunk to the designated position, proceed with sealing the bottom and constructing the base slab. Once the base slab has reached the set strength, remove the internal supports.

[0005] Furthermore, the width of the reinforcing strip is consistent with the wall thickness of the cyclone well, and the height is controlled between 800 and 1500 mm.

[0006] Furthermore, the circumferential reinforcing bars of the cyclone well wall itself are reinforced with additional circumferential reinforcing bars at intervals, and intermittent annular horizontal reinforcing bars are added in the thickness direction of the wall, with stirrups set at equal intervals.

[0007] Furthermore, the original steel bar spacing of 150~220mm on both sides of the reinforcing strip (both inside and outside the original cylinder wall) is increased to 75~110mm. The stirrups are made of steel bars with a diameter of Φ10~Φ14 and a spacing of 200~400mm. The annular horizontal reinforcing bars are made of main bars with the same diameter and specifications as the original steel bars and a spacing of 200~250mm.

[0008] Furthermore, the embedded parts are made of steel plates with a thickness of ≥16mm and a size of 500×1000mm.

[0009] Furthermore, when the depth of the vortex well exceeds 25 meters, a second inner support is installed on the inner wall of the second section from bottom to top.

[0010] Furthermore, the internal supports are H-beams or steel pipes.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention sets a reinforcing strip inside the cyclone well wall, and pre-embedded parts are set at intervals on the inner surface of the reinforcing strip. The internal supports are welded to the pre-embedded parts in sequence to form a combined double steel-concrete support reinforcement system. The reinforcing strip is similar to a hidden beam, adding circumferential reinforcing bars and stirrups to the original circumferential steel bars of the cylinder wall to increase its own rigidity. The internal supports are sequentially connected regular polygons, and the stress is reasonably balanced. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the construction structure of the vortex well caisson wall provided in an embodiment of the present invention; Figure 2 for Figure 1 Sectional view of plane AA; Figure 3 for Figure 2 Sectional view of the middle BB plane; Figure 4 This is a schematic diagram of the structure of the reinforced inner support embedded part provided in an embodiment of the present invention; The markings in the diagram are: 1. Cylinder wall; 2. Reinforcing strip; 3. Embedded part; 4. Internal support; 5. Reinforcing stirrup; 6. Circumferential reinforcement of the reinforcing strip; 7. Circumferential reinforcement of the original cylinder wall; 8. Diagonal support connecting rod; 9. Circular horizontal reinforcing bar. Detailed Implementation

[0013] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0014] like Figures 1 to 4As shown, the present invention provides a construction method for increasing the rigidity of the vortex well caisson wall, the steps of which are as follows: S1, Construction Reinforcing Strip 2: Based on the depth and wall thickness of the vortex well, the cylinder wall 1 is constructed in sections, each section being controlled to be 5-7m long; a reinforcing strip 2 is installed on the lowest section of the cylinder wall 1. The width of the reinforcing strip 2 is consistent with the wall thickness of the vortex well, and the height is controlled to be 800-1500mm. New reinforcing strip circumferential reinforcing bars 6 are installed at intervals on the original cylinder wall circumferential reinforcing bars 7 on both the inner and outer sides of the original cylinder wall 1, to reinforce the inner and outer sides of the vortex well cylinder wall 1 in a ring; circumferential horizontal reinforcing bars 9 are installed at certain intervals in the cylinder wall thickness direction as structural reinforcing bars, and reinforcing stirrups 5 are installed at equal intervals on the reinforcing strip 2.

[0015] Preferably, the spacing between the reinforcing bars on both sides of the reinforcing strip 2 (both inside and outside the original cylinder wall) is 150~220mm, which can be increased to 75~110mm. The reinforcing stirrups 5 are made of steel bars with a diameter of Φ10~Φ14 and a spacing of 200~400mm. The horizontal reinforcing bars 9 in the width direction of the reinforcing strip can be the same diameter as the circumferential reinforcing bars 7 (or reinforcing stirrups 5) of the original cylinder wall, with a spacing of 200~250mm.

[0016] S2. Embedded internal support parts 3 are evenly installed on the inner side of the reinforcing strip 2. The embedded parts 3 are steel plates with a thickness of 16mm or more and a size of 500*1000mm. They must meet the requirements for support welding. A certain number of steel reinforcement anchor bars are installed on the back of the embedded parts 3.

[0017] When the vortex well is deep (deeper than 25m), a second support is installed on the inner wall of the second section from the bottom to increase the rigidity of the lower part of the cylinder wall 1.

[0018] S3. Installation of Internal Support 4: After the caisson of cylinder wall 1 has sunk to a distance of 90-110cm from the ground, install the internal support 4. Weld the internal support 4 to the embedded parts 3 of the cylinder wall in sequence to form a polygonal support system. The internal support 4 is preferably H-beams or steel pipes, and the preferred dimensions are HM350 or larger H-beams or Φ350 or larger thick-walled steel pipes.

[0019] Preferably, an inclined support connecting rod 8 is provided in the middle of the inner support 4 to prevent the support from deflecting downwards. The inclined support connecting rod 8 is connected to the embedded part 3 on the cylinder wall 1.

[0020] S4. Caisson sinking: After the internal support system is installed, continue sinking the caisson of cylinder wall 1.

[0021] S5. Support Removal: After the caisson wall is lowered into place, the bottom is sealed and the bottom plate is constructed. Once the bottom plate has reached a certain strength and has the function of supporting, the internal support 4 is removed.

[0022] Effects of the invention: 1. The construction is simple and easy to operate, which is equivalent to adding reinforcing ribs to the cylinder wall. At the same time, the polygonal internal support provides a double support effect, forming a combined steel-concrete frame support system with the cylinder wall reinforcement belt, which improves the overall strength, rigidity and stability of the cylinder wall.

[0023] 2. The support is reusable and does not affect the excavation and removal of soil inside the well, which facilitates construction operations.

[0024] 3. The reinforcing strip is integrated with the cylinder wall, which not only improves the strength of the cylinder wall, but also does not affect the structural appearance quality.

[0025] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A construction method for increasing the rigidity of the caisson wall of a vortex well, characterized in that, Includes the following steps: S1. A reinforcing strip is added to the lowest section of the cylindrical wall of the vortex well; S2. Embedded internal support parts are evenly arranged on the inner side of the reinforcing strip, and anchor bars are set on the back of the embedded parts. S3. When the cylinder wall caisson is sunk to 90~110cm from the ground, install the internal support: connect the internal support to the embedded parts in sequence to form a polygonal support system. S4. An inclined support connecting rod is installed in the middle of the inner support, and the connecting rod is connected to the embedded part. S5. Continue sinking the caisson. After it has sunk to the designated position, carry out the bottom sealing and bottom slab construction. Once the bottom slab reaches the set strength, remove the internal support. The width of the reinforcing strip is consistent with the wall thickness of the cyclone well, and the height is controlled between 800 and 1500 mm; The cyclone well wall itself has additional circumferential reinforcing bars with increased density at intervals, and additional annular horizontal reinforcing bars are added at intervals in the wall thickness direction, with stirrups set at equal intervals.

2. The construction method for increasing the rigidity of the vortex well caisson wall according to claim 1, characterized in that, The original steel bars on both sides of the reinforcing strip are spaced 150~220mm apart, and then the spacing is increased to 75~110mm. The stirrups are made of steel bars with a diameter of Φ10~Φ14 and a spacing of 200~400mm. The annular horizontal reinforcing bars are made of main bars with the same diameter and specifications as the original steel bars and a spacing of 200~250mm.

3. The construction method for increasing the rigidity of the vortex well caisson wall according to claim 1, characterized in that, The embedded parts are made of steel plates with a thickness of ≥16mm and a size of 500×1000mm.

4. The construction method for increasing the rigidity of the vortex well caisson wall according to claim 1, characterized in that, When the depth of the vortex well exceeds 25 meters, a second inner support is installed on the inner wall of the second section from bottom to top.

5. The construction method for increasing the rigidity of the vortex well caisson wall according to claim 1, characterized in that, The internal support is made of H-beams or steel pipes.

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