Open caisson construction method suitable for road covering and excavation without traffic interruption

Abstract

The invention discloses an open caisson construction method suitable for road cover and excavation without interrupting traffic, an open caisson comprises a plurality of open caisson structure sections, and the construction process comprises the following steps: firstly, constructing a coupling pile foundation, and constructing a cover plate to be connected with the coupling pile foundation; thirdly, subsection of the lowermost section of the open caisson structure is implemented below the cover plate, and a downward pressing force application device is arranged between each rectangular protrusion of the subsection of the lowermost section of the open caisson structure and the cover plate; then, all the downward pressing force application devices are started, soil is excavated in the open caisson in a matched mode, and the open caisson structure is pressed downwards in a segmented mode; after completion, rectangular column structures are arranged in all the rectangular grooves to form another open caisson structure subsection adjacent to the upper portion; a pressing force application device is arranged between each newly-arranged rectangular column structure and the cover plate, and all the pressing force application devices which are jacked to the maximum distance are dismantled; and pressing is repeated, the rectangular column structure is arranged, and the pressing force application device is disassembled and assembled till all the open caisson structure sections are pressed in. The open caisson construction can be completed under the condition that traffic is not interrupted.

Description

Technical Field

[0001] The present invention relates to the technical field of open caisson construction, and particularly to an open caisson construction method suitable for covering and excavating roads without interrupting traffic. Background Art

[0002] Caisson is a common deep foundation construction method, which is widely used in projects such as bridge piers and underground structures. The traditional open caisson construction method usually requires the fabrication of the caisson structure on the ground and then sinking it to the design elevation by its own weight or auxiliary equipment. The current open caisson construction methods all require occupying the entire planar projection area of the caisson. If the construction is carried out within the road range, it will cause traffic interruption, bringing great inconvenience to urban traffic and also restricting the application of caisson technology in busy traffic areas.

[0003] To solve this problem, the prior art usually adopts methods such as temporary traffic diversion or sectional construction. However, these methods not only have a long construction period but also have a greater impact on traffic.

[0004] Therefore, how to construct the open caisson without interrupting traffic during the construction process has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides an open caisson construction method suitable for covering and excavating roads without interrupting traffic. The purpose is achieved by adding a cover plate to the open caisson as a temporary road and using the pressing and sinking method to sink the open caisson, so as to complete the open caisson construction without interrupting traffic.

[0006] To achieve the above purpose, the present invention discloses an open caisson construction method suitable for covering and excavating roads without interrupting traffic. The open caisson includes a plurality of open caisson structure segments connected end to end in sequence along the vertical direction. The construction process includes the following steps:

[0007] Step 1, Preparation work, including determining the design parameters of the open caisson, cover plate and coupling pile foundation to be constructed;

[0008] Step 2, Implement the coupling pile foundation on the periphery of the open caisson to be constructed;

[0009] Each coupling pile foundation reserves connecting steel bars at the positions corresponding to the cover plate and the top plate structure of the corresponding open caisson;

[0010] Step 3, Construct the cover plate; the cover plate is connected to the corresponding coupling pile foundation through the corresponding connecting steel bars, so that the top surface of the cover plate is flush with the road surface;

[0011] Step 4. Segment the lowermost segment of the caisson structure under the cover plate; at the upper end where the lowermost segment of the caisson structure is connected to the second segment of the caisson structure above, a plurality of rectangular grooves penetrating inside and outside are provided along the width direction of each side, so that the upper end surface of the side wall forms a toothed structure with a plurality of rectangular protrusions;

[0012] Step 5. Install a downward pressing force application device between each rectangular protrusion at the upper end of the lowermost segment of the caisson structure and the cover plate;

[0013] Step 6. Start all the downward pressing force application devices and cooperate with excavating soil in the caisson to press all the caisson structure segments located below the cover plate downward;

[0014] Step 7. After all the downward pressing force application devices reach the maximum lifting distance, install the upper segment of the caisson structure segment in the rectangular groove where the downward pressing force application device is not installed;

[0015] Above the second segment of the caisson structure segment, each segment of the caisson structure segment includes several rectangular column structures with a height twice the depth of the rectangular groove. By clamping the corresponding rectangular column structures in the rectangular grooves of the adjacent lower segment of the caisson structure segment, the rectangular protrusions and rectangular grooves of the caisson structure segment are formed;

[0016] Step 8. Install the downward pressing force application device between each newly installed rectangular column structure and the cover plate. After that, remove all the downward pressing force application devices that have reached the maximum lifting distance;

[0017] Step 9. Repeat Step 6 to Step 9 until all the caisson structure segments are pressed down;

[0018] Step 10. Pour the bottom-sealing concrete at the lower end of the lowermost segment of the caisson structure segment, and construct the structural roof slab at the upper end of the upper caisson structure segment;

[0019] Step 11. Cut off the connecting steel bars between the cover plate and the corresponding coupling pile foundation, remove the cover plate, backfill on the structural roof slab, and restore the road.

[0020] Preferably, in Step 10, the structural roof slab is connected to the corresponding coupling pile foundation through the corresponding connecting steel bars.

[0021] Preferably, each downward pressing force application device is a jack.

[0022] Preferably, underwater excavation robots are used to excavate soil in the caisson, and the soil is discharged to the ground through a pipeline by a cutter suction device.

[0023] Preferably, during the construction process, the verticality of each segment of the open caisson structure sinking and the deformation of the surrounding roads are monitored in real time, and the sinking pressure and construction parameters output by each pressing force application device are adjusted in a timely manner to ensure construction safety and road traffic safety.

[0024] Preferably, each segment of the open caisson structure is provided with a frame structure for support.

[0025] Preferably, each segment of the open caisson structure is a precast member.

[0026] Advantages of the present invention:

[0027] By adding a cover plate to the open caisson as a temporary road and using the pressing and sinking method to sink the open caisson, the present invention completes the construction of the open caisson without interrupting traffic.

[0028] The following will further illustrate the concept, specific structure and technical effects of the present invention with reference to the accompanying drawings to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0029] Figure 1 Shows a longitudinal sectional structure diagram during the construction of an embodiment of the present invention.

[0030] Figure 2 Shows a plan view during the construction of an embodiment of the present invention

[0031] Figure 3 Shows a structural schematic diagram of the splicing of three segments of the open caisson structure in an embodiment of the present invention.

[0032] Figure 4 Shows a longitudinal sectional structure diagram after the construction of an embodiment of the present invention is completed. Detailed Embodiments

[0033] Embodiment

[0034] As Figures 1 to 4 shown, an open caisson construction method suitable for cover excavation of roads without interrupting traffic, the open caisson 4 includes a plurality of open caisson structure segments 4-1, 4-2, 4-3 that are sequentially connected end to end in the vertical direction, and the construction process includes the following steps:

[0035] Step 1, preparation work, including determining the design parameters of the open caisson 4, the cover plate 2 and the coupled pile foundation 3 to be constructed;

[0036] Step 2, implement the coupled pile foundation 3 on the periphery of the open caisson 4 to be constructed;

[0037] Each coupled pile foundation 3 reserves connecting steel bars at the positions corresponding to the cover plate 2 and the top plate structure 6 of the corresponding open caisson 4;

[0038] Step 3, construct the cover plate 2; the cover plate 2 is connected to the corresponding coupling pile foundation 3 through corresponding connecting steel bars, so that the top surface of the cover plate 2 is flush with the surface of the road 1; the cover plate 2 with the top surface flush with the surface of the road 1 can better ensure the normal passage of vehicles.

[0039] Step 4, implement the lowest segment of the caisson structure segment 4-1 under the cover plate 2; at the upper end where the lowest segment of the caisson structure segment 4-1 is connected to the second segment of the caisson structure segment 4-2 above, a plurality of rectangular grooves penetrating inside and outside are provided along the width direction of each side, so that the upper end surface of the side wall forms a toothed structure with a plurality of rectangular protrusions;

[0040] Step 5, install a downward pressing force application device 5 between each rectangular protrusion at the upper end of the cover plate 2 and the lowest segment of the caisson structure segment 4-1;

[0041] Step 6, start all the downward pressing force application devices 5, and cooperate with excavating soil in the caisson 4 to press all the caisson structure segments 4-1, 4-2, 4-3 located below the cover plate 2 downward;

[0042] Step 7, after all the downward pressing force application devices 5 are lifted to the maximum distance, implement the upper segment of the caisson structure segments 4-2, 4-3 in the rectangular grooves where the downward pressing force application devices 5 are not installed;

[0043] Starting from above the second segment of the caisson structure segment 4-2, each segment of the caisson structure segments 4-2, 4-3 includes a number of rectangular column structures with a height twice that of the depth of the rectangular groove, and by clamping the corresponding rectangular column structures in the rectangular grooves of the adjacent lower segment of the caisson structure segments 4-1, 4-2, the rectangular protrusions and rectangular grooves of the caisson structure segments 4-2, 4-3 are formed;

[0044] Step 8, install a downward pressing force application device 5 between each newly installed rectangular column structure and the cover plate 2, and then, remove all the downward pressing force application devices 5 lifted to the maximum distance;

[0045] Step 9, repeat steps 6 to 9 until all the caisson structure segments 4-1, 4-2, 4-3 are pressed downward;

[0046] Step 10, fill the bottom of the lowest segment of the caisson structure segment 4-1 with sealant concrete 7, and construct a structural roof slab 6 at the upper end of the upper caisson structure segment 4-1;

[0047] Step 11, cut off the connecting steel bars between the cover plate 2 and the corresponding coupling pile foundation 3, remove the cover plate 2, backfill on the structural roof slab 6, and restore the road 1.

[0048] The present invention uses the press - sinking method for construction: Each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, sinks evenly. Using the cover plate 2 as a reaction support, a downward pressure is applied through the downward pressing force - applying device 5, causing each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, to sink gradually.

[0049] The present invention can divide the caisson into several segments of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, according to the net clearance height under the cover plate 2, fabricate and sink them segment by segment until each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, sinks to the design elevation, ensuring that vehicle traffic is not affected.

[0050] The present invention sets a cover plate 2 with sufficient strength and stiffness at the top of the caisson 4. It can not only bear the vehicle load and be used as a temporary road, but also set a downward pressing force - applying device 5 between the cover plate 2 and each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3. By applying a downward pressure to each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, through the downward pressing force - applying device 5, the cover plate 2 is used as a structure to provide reaction force when each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, sinks.

[0051] The cover plate 2 is only connected to the coupling pile foundation 3 around the caisson 4 and is not connected to the caisson 4, and is removed after the construction is completed.

[0052] A number of coupling pile foundations 3 are set around the caisson 4; the coupling pile foundations 3 are connected to the cover plate 2 during construction. They not only serve as the foundation for bearing the vehicle load, that is, the downward pressure, but also provide reaction force, that is, upward pulling force, for the sinking construction of each segment of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3.

[0053] After all segments of the caisson structure, namely 4 - 1, 4 - 2, and 4 - 3, sink into place, the coupling pile foundations 3 connected to the cover plate 2 are cut off from the connection with the cover plate 2 and connected to the caisson 4 to provide anti - buoyancy force, that is, upward pulling force, during the long - term service process of the caisson 4.

[0054] In some embodiments, in step 10, the structural roof slab 6 is connected to the corresponding coupling pile foundation 3 through the corresponding connecting steel bars.

[0055] In some embodiments, each downward pressing force - applying device 5 is a jack.

[0056] In some embodiments, underwater excavation robots are used for excavating soil inside the caisson 4, and the soil is discharged to the ground through a pipe by a cutter - suction device.

[0057] In practical applications, using underwater excavation robots for excavating soil inside the caisson 4 and discharging the soil to the ground through a pipe by a cutter - suction device can reduce the size of the ground soil outlet and at the same time reduce the number of construction operators under the cover plate.

[0058] In some embodiments, during the construction process, the verticality of the sinking of each segment 4-1, 4-2, 4-3 of the caisson structure and the deformation of the surrounding roads are monitored in real time, and the pressing force and construction parameters output by each pressing device 5 are adjusted in a timely manner to ensure construction safety and road traffic safety.

[0059] In some embodiments, each segment 4-1, 4-2, 4-3 of the caisson structure is provided with a frame structure for support.

[0060] In some embodiments, each segment 4-1, 4-2, 4-3 of the caisson structure is a prefabricated component.

[0061] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning, or limited experiments based on the concept of the present invention on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A caisson construction method suitable for road excavation without interrupting traffic; it is characterized by: The caisson (4) comprises a plurality of caisson structure segments (4-1, 4-2, 4-3) which are connected end to end in sequence in the vertical direction. The construction process comprises the following steps: Step 1, preparation work, including determining the design parameters of the caisson (4), cover plate (2) and coupling pile foundation (3) to be constructed; Step 2: Implementing the coupling pile foundation (3) at the periphery of the caisson (4) to be constructed; Each of the coupling pile foundations (3) has connection steel bars reserved at positions corresponding to the cover plate (2) and the top plate structure (6) of the caisson (4); Step 3, constructing the cover plate (2); the cover plate (2) is connected to the corresponding coupling pile foundation (3) through the corresponding connecting steel bars, so that the top surface of the cover plate (2) is flush with the surface of the road (1); Step 4, implementing the lowermost section of the caisson structure segment (4-1) under the cover plate (2); the upper end of the lowermost section of the caisson structure segment (4-1) connected to the upper second section of the caisson structure segment (4-2) is provided with a plurality of rectangular grooves penetrating inside and outside along the width direction of each side, so that the upper end surface of the side wall forms a tooth-like structure with a plurality of rectangular protrusions; Step 5, a downward pressure applying device (5) is provided between the cover plate (2) and each of the rectangular protrusions at the upper end of the lowermost caisson structure segment (4-1) and the cover plate (2); Step 6, starting all the downward pressure applying devices (5), and cooperating with digging in the caisson (4), pressing all the caisson structure segments (4-1, 4-2, 4-3) located below the cover plate (2) downward; Step 7, after all the downward pressure applying devices (5) are lifted to the maximum distance, the upper section of the caisson structure segmentation (4-2, 4-3) is implemented in the rectangular groove where the downward pressure applying device (5) is not provided; From the second section of the caisson structure segment (4-2) onwards, each section of the caisson structure segment (4-2, 4-3) includes a plurality of rectangular column structures whose height is twice the depth of the rectangular groove, and the rectangular protrusions and rectangular grooves of the caisson structure segment (4-2, 4-3) are formed by clamping the corresponding rectangular column structures into the rectangular grooves of the caisson structure segments (4-1, 4-2) in the adjacent section below; Step 8, the downward pressure force applying device (5) is arranged between each of the newly arranged rectangular column structures and the cover plate (2), and then all the downward pressure force applying devices (5) are removed after being lifted to the maximum distance; Step 9, repeating steps 6 to 9 until all the caisson structure segments (4-1, 4-2, 4-3) are pressed down; Step 10, filling the bottom sealing concrete (7) at the lower end of the lowermost caisson structure segment (4-1), and applying the structural top plate (6) at the upper end of the upper caisson structure segment (4-1); Step 11: cut the connecting steel bars between the cover plate (2) and the corresponding coupling pile foundation (3), remove the cover plate (2), backfill on the structural top plate (6), and restore the road (1).

2. The caisson construction method suitable for road covering and excavation without interrupting traffic according to claim 1 is characterized in that: In step 10, the structural top plate (6) is connected to the corresponding coupling pile foundation (3) via the corresponding connecting steel bars.

3. The caisson construction method suitable for road covering and excavation without interrupting traffic according to claim 1 is characterized in that: Each of the downward pressure applying devices (5) is a jack.

4. The caisson construction method suitable for road covering and excavation without interrupting traffic according to claim 1 is characterized in that: An underwater excavation robot is used to excavate the soil in the caisson (4), and the soil is discharged to the ground through a pipe by a winch suction device.

5. The caisson construction method suitable for road covering and excavation without interrupting traffic according to claim 1 is characterized in that: During the construction process, the verticality of the sinking of each caisson structure segment (4-1, 4-2, 4-3) and the deformation of the surrounding roads are monitored in real time, and the sinking force and construction parameters output by each downward force-applying device (5) are adjusted in time to ensure construction safety and road traffic safety.

6. The caisson construction method suitable for road covering and excavation without interrupting traffic according to claim 1 is characterized in that: Each of the caisson structure sections (4-1, 4-2, 4-3) is provided with a frame structure for support.

7. The caisson construction method suitable for road covering and excavation without interrupting traffic according to claim 1 is characterized in that: Each of the caisson structure sections (4-1, 4-2, 4-3) is a prefabricated part.

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