Caisson structure for facilitating sinking and anti-floating and method of use

Abstract

The application discloses a sunk well structure beneficial to sinking and anti-floating and a use method thereof, a side wall of a sunk well main body is provided with a plurality of electromagnetic force adsorption devices and a plurality of externally attached steel plates; all the externally attached steel plates can cover the outer surface of the side wall of the sunk well main body after being spliced and are all adsorbed and fixed on the outer surface of the sunk well main body through the electromagnetic force adsorption devices at corresponding positions; one side of each externally attached steel plate facing the outside of the sunk well main body is a smooth surface; the side wall of the sunk well main body is provided with a plurality of reserved holes penetrating in the horizontal direction; each reserved hole is provided with a resistance increasing block. In use, the electromagnetic force adsorption devices are closed and the externally attached steel plates are pulled out one by one during the sinking process of the sunk well main body, then the resistance increasing blocks are inserted into the reserved holes, when the sunk well main body sinks to the designed depth, all the resistance increasing blocks are moved out of the reserved holes, and finally cement slurry is injected into the soil through the grouting pipe and the grouting port. The sunk well structure can reduce the sinking resistance and increase the anti-floating resistance when the sunk well sinks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of caisson construction, in particular to a caisson structure facilitating sinking and anti-floating and a use method thereof. BACKGROUND

[0002] In the existing caisson technical solution, methods of increasing pressure on the top of the caisson structure or injecting lubricating materials into the side wall of the caisson to reduce frictional resistance are used to help the caisson sink during sinking; and after the caisson sinks, a large amount of concrete is filled to increase the weight of the caisson structure to resist water buoyancy.

[0003] According to the above situation, it can be seen that the main stress system of the caisson structure is contradictory during sinking and after forming an underground space, on the one hand, the side wall frictional resistance needs to be reduced during sinking, and on the other hand, the side wall frictional resistance needs to be increased after forming an underground space to improve the anti-floating ability.

[0004] However, for the above problems, the existing technology only adopts a drag reduction measure for the side wall of the caisson, and completely relies on the self-weight of the caisson structure and the weight of the filling concrete at the bottom of the caisson for anti-floating, which also leads to the use of a large amount of filling concrete in actual engineering, not only increasing the waste of a large amount of materials and increasing carbon emissions, but also increasing the additional sinking depth of the caisson and improving the cost.

[0005] Therefore, how to reduce the amount of filling concrete, reduce the construction period and construction cost has become a technical problem that needs to be solved by the technical personnel in the field. SUMMARY

[0006] In view of the above defects of the prior art, the present application provides a caisson structure facilitating sinking and anti-floating and a use method thereof, which realizes the purpose of facilitating drag reduction sinking during sinking of the caisson and increasing the anti-floating resistance after reaching the design depth, so as to reduce the amount of filling concrete, reduce the construction period and construction cost.

[0007] To achieve the above purpose, the present application discloses a caisson structure facilitating sinking and anti-floating, comprising a tubular caisson main body.

[0008] Among them, the side wall of the caisson main body is provided with a plurality of electromagnetic force adsorption devices and a plurality of externally attached steel plates;

[0009] All the externally attached steel plates can cover the outer surface of the side wall of the caisson main body after splicing, and are all fixed on the outer surface of the caisson main body through the electromagnetic force adsorption devices at the corresponding positions;

[0010] The side of each externally attached steel plate facing the outside of the caisson main body is a smooth surface with a surface roughness not greater than Ra12.5;

[0011] The side wall of the caisson body is provided with a plurality of reserved holes penetrating in the horizontal direction;

[0012] A resistance-increasing block is provided in each of the reserved holes;

[0013] Each of the resistance-increasing blocks can move back and forth along the axial direction of the corresponding reserved hole, and the length of each block is greater than the thickness of the side wall of the caisson body.

[0014] Preferably, a surface of each of the external steel plates facing the outside of the caisson body is coated with a lubricating layer formed by a lubricating material.

[0015] Preferably, the cross-section of the caisson body is circular or polygonal.

[0016] Preferably, a plurality of grouting pipes are provided in the side wall of the caisson body;

[0017] Each of the grouting pipes is connected to a plurality of grouting ports arranged on the outer surface of the caisson body.

[0018] Preferably, the lower end of the caisson body is provided with a pointed blade foot having a trapezoidal cross section and surrounding the body.

[0019] The present invention also provides a method for using a caisson structure that is conducive to sinking and anti-floating, comprising the following steps:

[0020] Step 1: All the external steel plates are fixed to the outer surface of the caisson body one by one by using the corresponding electromagnetic adsorption devices;

[0021] Step 2, sinking the caisson body;

[0022] Step 3: After the caisson body sinks to the designed depth, all the electromagnetic adsorption devices are closed one by one from bottom to top, and the external steel plates adsorbed by the closed electromagnetic adsorption devices are pulled out at the same time;

[0023] When the reserved hole exists at the position corresponding to any of the pulled-out external steel plates, the corresponding resistance-increasing block is inserted into the reserved hole;

[0024] One end of each of the resistance-increasing blocks facing the outside of the caisson body is flush with the outer surface of the caisson body;

[0025] Step 4: After all the external steel plates are pulled out, all the resistance-increasing blocks are moved toward the outside of the caisson body and inserted into the soil from bottom to top;

[0026] Step 5: After the resistance-increasing block is inserted into the soil, cement slurry is injected into the soil through the grouting pipe and grouting port provided on the side wall of the caisson body.

[0027] Preferably, in step 2, lubricating material is coated on one side of all the external steel plates facing the outside of the caisson body to form a lubricating layer.

[0028] Preferably, in step 2, soil is filled between each of the external steel plates and the caisson side wall structure, and then a portion of the corresponding resistance-increasing plate is inserted into each of the reserved holes. After sinking is completed, each of the resistance-increasing plates is lengthened.

[0029] Beneficial effects of the present invention:

[0030] The application of the present invention can facilitate the sinking of the caisson by reducing resistance and increasing the anti-floating resistance after reaching the designed depth. Compared with the existing technology, the amount of filling concrete is reduced, and the construction period and construction cost are shortened.

[0031] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram showing the upper end surface of the caisson body after the outer surface is fixed with an external steel plate in one embodiment of the present invention.

[0033] Figure 2 A schematic diagram of the longitudinal cross-sectional structure of the caisson body after the outer surface of the caisson body is fixed with an external steel plate in one embodiment of the present invention is shown.

[0034] Figure 3 A schematic diagram showing the upper end surface state of the caisson body after construction is completed in one embodiment of the present invention.

[0035] Figure 4 A schematic diagram of the longitudinal cross-sectional structure of the caisson body after construction is completed in one embodiment of the present invention is shown. DETAILED DESCRIPTION Example

[0036] like Figures 1 to 4 As shown, the caisson structure which is conducive to sinking and anti-floating includes a tubular caisson body 1.

[0037] The side walls of the caisson body 1 are provided with a number of electromagnetic adsorption devices 3 and a number of external steel plates 2;

[0038] All the external steel plates 2 can cover the outer surface of the side wall of the caisson body 1 after being spliced ​​together, and are fixed to the outer surface of the caisson body 1 by the electromagnetic adsorption devices 3 at the corresponding positions;

[0039] The surface of each external steel plate 2 facing the outside of the caisson body 1 is smooth and has a surface roughness not greater than Ra12.5;

[0040] The side wall of the caisson body 1 is provided with a plurality of reserved holes 7 penetrating in the horizontal direction;

[0041] Each reserved hole 7 is provided with a resistance increasing block 8;

[0042] Each resistance-increasing block 8 can reciprocate along the axial direction of the corresponding reserved hole 7 , and the length of each block 8 is greater than the thickness of the side wall of the caisson body 1 .

[0043] The present invention fixes a plurality of external steel plates 2 on the outer surface of the side wall of the caisson body 1 through the electromagnetic force adsorption device 3 for covering, and the side of each external steel plate 2 facing the outside of the caisson body 1 is a smooth surface.

[0044] When the caisson body 1 sinks, the external steel plate 2 sinks together with the concrete caisson structure, and its smooth surface can play the effect of reducing resistance and assisting sinking;

[0045] After sinking is completed, all electromagnetic adsorption devices 3 are turned off and all external steel plates 2 are pulled out, and resistance-increasing blocks 8 are inserted from the reserved holes 7 to increase the anti-floating resistance.

[0046] In some embodiments, a surface of each external steel plate 2 facing the outside of the caisson body 1 is coated with a lubricating layer formed by a lubricating material.

[0047] In some embodiments, the cross section of the caisson body 1 is circular or polygonal.

[0048] In some embodiments, a plurality of grouting pipes 5 are provided in the side wall of the caisson body 1;

[0049] Each grouting pipe 5 is connected to a plurality of grouting ports 6 provided on the outer surface of the caisson body 1 .

[0050] In some embodiments, the lower end of the caisson body 1 is provided with a pointed blade foot 4 having a trapezoidal cross section and surrounding the caisson body 1 .

[0051] The present invention also provides a method for using a caisson structure that is conducive to sinking and anti-floating, comprising the following steps:

[0052] Step 1: All the external steel plates 2 are fixed to the outer surface of the caisson body 1 one by one through the corresponding electromagnetic adsorption devices 3;

[0053] Step 2: Sinking the caisson body 1;

[0054] Step 3: After the caisson body 1 sinks to the designed depth, all electromagnetic adsorption devices 3 are closed one by one from bottom to top, and the external steel plates 2 adsorbed by the closed electromagnetic adsorption devices 3 are pulled out at the same time;

[0055] When there is a reserved hole 7 at the position corresponding to any of the pulled-out external steel plates 2, a corresponding resistance-increasing block 8 is inserted into the reserved hole 7;

[0056] One end of each resistance-increasing block 8 facing the outside of the caisson body 1 is flush with the outer surface of the caisson body 1;

[0057] Step 4: After all the external steel plates 2 are pulled out, all the resistance-increasing blocks 8 are moved toward the outside of the caisson body 1 and inserted into the soil from bottom to top;

[0058] Step 5: After the resistance-increasing block 8 is inserted into the soil, cement slurry is injected into the soil through the grouting pipe 5 and the grouting port 6 provided on the side wall of the caisson body 1 .

[0059] In some embodiments, in step 2, lubricating material is applied to one side of all the external steel plates 2 facing the outside of the caisson body 1 to form a lubricating layer.

[0060] In some embodiments, in step 2, soil is filled between each external steel plate 2 and the caisson side wall structure 1, and then a portion of the corresponding resistance-increasing plate 8 is inserted into each reserved hole 7. After sinking is completed, each resistance-increasing plate 8 is lengthened.

[0061] In actual application, since there is a gap between the external steel plate 2 and the caisson side wall structure 1, when the external steel plate 2 is pulled out, the surrounding soil will fill these gaps and cause large deformation. Therefore, the soil is pre-filled to reduce deformation. At the same time, because there is filled soil, in order to prevent the soil from coming out of the reserved hole, a part of the resistance-increasing plate 8 is first inserted to block the reserved hole 7.

[0062] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A caisson structure that is conducive to sinking and anti-floating, comprising a tubular caisson body (1); characterized in that: The side walls of the caisson body (1) are provided with a plurality of electromagnetic force adsorption devices (3) and a plurality of externally attached steel plates (2); All of the externally attached steel plates (2) can cover the outer surface of the side wall of the caisson body (1) after being spliced ​​together, and are adsorbed and fixed to the outer surface of the caisson body (1) by the electromagnetic adsorption devices (3) at corresponding positions; The surface of each of the external steel plates (2) facing the outside of the caisson body (1) is smooth and has a surface roughness not greater than Ra12.5; The side wall of the caisson body (1) is provided with a plurality of reserved holes (7) penetrating in the horizontal direction; A resistance-increasing block (8) is provided in each of the reserved holes (7); Each of the resistance-increasing blocks (8) is capable of reciprocating along the axial direction of the corresponding reserved hole (7), and the length of each of the blocks is greater than the thickness of the side wall of the caisson body (1).

2. The caisson structure that is conducive to sinking and anti-floating according to claim 1 is characterized in that: A lubricating layer formed by a lubricating material is coated on one side of each of the external steel plates (2) facing the outside of the caisson body (1).

3. The caisson structure that is conducive to sinking and anti-floating according to claim 1 is characterized in that: The cross section of the caisson body (1) is circular or polygonal.

4. The caisson structure that is conducive to sinking and anti-floating according to claim 1 is characterized in that: A plurality of grouting pipes (5) are provided in the side wall of the caisson body (1); Each of the grouting pipes (5) is connected to a plurality of grouting ports (6) provided on the outer surface of the caisson body (1).

5. The caisson structure that is conducive to sinking and anti-floating according to claim 1 is characterized in that: The lower end of the caisson body (1) is provided with a pointed blade foot (4) with a trapezoidal cross section and surrounding the entire circumference.

6. The method for using the caisson structure that is conducive to sinking and anti-floating according to claim 1, characterized in that: The steps include: Step 1: All the external steel plates (2) are adsorbed and fixed to the outer surface of the caisson body (1) one by one through the corresponding electromagnetic adsorption devices (3); Step 2, sinking the caisson body (1); Step 3: After the caisson body (1) sinks to the designed depth, all the electromagnetic force adsorption devices (3) are closed one by one from bottom to top, and the external steel plates (2) adsorbed by the closed electromagnetic force adsorption devices (3) are pulled out at the same time; When the reserved hole (7) exists at the position corresponding to any of the pulled-out external steel plates (2), the corresponding resistance-increasing block (8) is inserted into the reserved hole (7); One end of each of the resistance-increasing blocks (8) facing the outside of the caisson body (1) is flush with the outer surface of the caisson body (1); Step 4: After all the external steel plates (2) are pulled out, all the resistance-increasing blocks (8) are moved toward the outside of the caisson body (1) and inserted into the soil from bottom to top; Step 5: After the resistance-increasing block (8) is inserted into the soil, cement slurry is injected into the soil through the grouting pipe (5) and grouting port (6) provided on the side wall of the caisson body (1).

7. The method for using the caisson structure that is conducive to sinking and anti-floating according to claim 6, characterized in that: In step 2, a lubricating material is applied to one side of all the externally attached steel plates (2) facing the outside of the caisson body (1) to form a lubricating layer.

8. The method for using the caisson structure that is conducive to sinking and anti-floating according to claim 6, characterized in that: In step 2, soil is filled between each of the external steel plates (2) and the side wall structure of the caisson, and then a portion of the corresponding resistance-increasing block (8) is inserted into each of the reserved holes (7). After sinking is completed, each of the resistance-increasing blocks (8) is lengthened.

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