A construction method for shear-resistant composite foundation treatment of silt geological bridge foundation

Abstract

The invention discloses a silt geological bridge foundation shear-resistant composite foundation treatment construction method, first according to the design drawings, a plurality of support piles are constructed at the corresponding positions of the foundation; and steel sheet piles or locking steel pipe piles are inserted to form a cofferdam outside the support pile range; then a drilling rig is used to construct a mixing pile in the cofferdam, and the mixing pile fills the space between each support pile; when constructing a circle of mixing piles around the support piles, the distance between the outer side of the drill rod of the drilling rig and the outer wall of the support pile is 20-30cm, and as the drill rod of the drilling rig is drilled, a flushing pipe is used to spray cement slurry on the soil between the drill rod of the drilling rig and the support pile, and the cement slurry sprayed by the flushing pipe impacts the soil between the drill rod of the drilling rig and the support pile to the mixing pile, and the collapsed soil is mixed with the cement slurry of the mixing pile to form a new cement slurry and fill the space after the soil collapses. The application has the effect of improving the shear resistance of the support pile and the cap.

Description

Technical Field

[0001] The invention relates to the technical field of foundation treatment, and in particular to a construction method for treating a shear-resistant composite foundation of a silt geological bridge foundation. Background Art

[0002] The bridge's piers and supporting piles are usually located in the water and on the shore to support the bridge together. At present, the design of bridges is diversified. In order to meet the design requirements of aesthetics and craftsmanship, some bridges only retain the piers and supporting piles on the shore. The water surface of the bridge is no longer directly supported by piers and supporting piles. The entire bridge is supported only by the piers and supporting piles on the shore. For bridges in this situation, if the design requires arching to tension prestress, the arched bridge will generate a horizontal shear force on the supporting piles and piers, which may easily cause the supporting piles and piers to tilt or shift, resulting in the release of the prestress of the bridge and reducing the strength of the bridge. Summary of the invention

[0003] In order to improve the shear resistance and stability of supporting piles and caps, the present application provides a construction method for shear-resistant composite foundation treatment of silt geological bridge foundations.

[0004] The present application provides a method for treating a shear-resistant composite foundation of a bridge foundation in muddy geology, which adopts the following technical solution:

[0005] A construction method for treating a shear-resistant composite foundation of a bridge foundation in muddy geology comprises the following steps:

[0006] According to the design drawings, construct multiple supporting piles at the corresponding positions of the foundation; and insert steel sheet piles or locking steel pipe piles to form a cofferdam outside the range of the supporting piles;

[0007] Use a mud barrel to prepare cement slurry, and use a mud pump to connect the drilling rig and the mud barrel; use the drilling rig to construct mixing piles in the cofferdam, and the mixing piles fill the space between the supporting piles; when constructing a circle of mixing piles around the supporting piles, the distance between the outer side of the drill rod of the drilling rig and the outer wall of the supporting pile is 20-30cm. As the drill rod of the drilling rig drills in, use a flushing pipe to spray cement slurry on the soil between the drill rod of the drilling rig and the supporting piles. The cement slurry sprayed by the flushing pipe impacts the soil between the drill rod of the drilling rig and the supporting piles to collapse to the mixing piles. The collapsed soil is mixed with the cement slurry of the mixing piles to form new cement slurry and fill the space after the soil collapses;

[0008] After all the soil between the supporting piles is replaced by mixing piles, the cofferdam is removed.

[0009] By adopting the above technical scheme, a cofferdam is first constructed to surround the foundation of the pedestal and support piles are constructed, and then mixing piles are constructed to fill the space between the support piles. The support piles are connected into one by mixing piles to improve the shear resistance and stability of the support piles and the pedestal. Since the mixing piles of the present application fill the space between the support piles, they are used to reinforce the soil between the piles and connect the support piles into one, instead of being conventionally arranged at intervals in the foundation to improve the bearing capacity of the foundation. After the mixing piles are constructed, the entire foundation is solidified into one, and the construction of the support piles requires squeezing the soil, which will increase the construction cost and difficulty of the support piles. Therefore, the support piles of the present application are constructed before the mixing piles, and after the support piles are constructed, it is easy to affect It affects the construction of mixing piles, especially when constructing mixing piles in a circle around the supporting piles, the drill rod of the drill rig is prone to collide with the supporting piles and cause damage to the supporting piles. In order to solve the problem of collision between the drill rod of the drill rig and the supporting piles, when constructing mixing piles in a circle around the supporting piles, the distance between the outer side of the drill rod of the drill rig and the outer wall of the supporting pile is maintained in the range of 20-30cm. For the soil between the drill rod of the drill rig and the supporting piles that remains at this time, cement slurry sprayed from a flushing pipe is used to impact the soil, causing the soil to collapse. The cement slurry fills the space after the soil collapses, and the cement slurry clings to the outer wall of the supporting pile, so that the constructed mixing piles are closely combined with the supporting piles, and the supporting piles are connected into one through the mixing piles.

[0010] Preferably, before constructing a circle of mixing piles around a certain supporting pile, a stabilizing frame is first used to fix the supporting pile with the surrounding supporting piles, and the stabilizing frame is kept away from the position of the drilling rig.

[0011] By adopting the above technical solution, the stabilizing frame connects a plurality of supporting piles into one, thereby improving the stability of the supporting piles at the construction site, thereby reducing the adverse effects of mixing pile construction on the supporting piles.

[0012] Preferably, the stabilizing frame is constructed using steel pipes, and the method of connecting the stabilizing frame to the supporting piles is the same as the method of connecting the scaffolding columns.

[0013] By adopting the above technical solution, since the stabilizing frame is mainly used to bear the radial force of the supporting piles, the connection can be achieved by using the method of steel pipe embracing the columns. The connection has good stability and is convenient and quick to disassemble and assemble, which is conducive to improving construction efficiency.

[0014] Preferably, the flushing pipe is connected to a slurry supply pump, and the pressure of the cement slurry supplied to the flushing pipe by the slurry supply pump is 20-30Mpa.

[0015] By adopting the above technical solution, the flushing pipe is used to impact the soil between the drill rod of the drilling rig and the supporting piles. If the cement slurry is sprayed at the same pressure as the drilling rig, the impact effect on the soil is weak. Therefore, a separate slurry supply pump is set, and the slurry supply pressure of the slurry pump is set to 20-30Mpa to improve the impact effect on the soil.

[0016] Preferably, the flushing pipe is inserted along the outer wall of the support pile, and the flushing pipe is connected to the lifting mechanism of the drilling rig and rises and falls with the lifting mechanism of the drilling rig.

[0017] By adopting the above technical solution, the flushing pipe is used to impact the soil between the drill rod and the support pile of the drilling rig. The flushing pipe is inserted along the outer wall of the support pile to impact the soil in the direction of the drilling rig, reducing the impact on the support pile. The flushing pipe rises and falls with the lifting mechanism of the drilling rig and rises and falls with the drill rod, keeping synchronization with the drill rod, improving efficiency, and is equivalent to using the static pressure method to insert the flushing pipe, reducing the impact on the steel pipe.

[0018] Preferably, the flushing pipe includes a pipe body, an end head and a nozzle, the end head is installed at one end of the pipe body, a side wall of the end of the pipe body connected to the end head is provided with a slot, the nozzle is installed in the slot, the end of the pipe body away from the end head is connected to the lifting mechanism of the drilling rig through a connecting rod, the connecting rod is a telescopic rod, and the spray hole of the nozzle faces the drilling rig.

[0019] By adopting the above technical solution, the end of the pipe body is sealed to facilitate the insertion of the flushing pipe. The nozzle is directed toward the drilling rig, which is beneficial for the soil to be laterally impacted toward the drill rod, thereby facilitating the drill rod to mix and crush the soil. The connecting rod is a telescopic rod, which can reduce the shaking of the drilling rig and transmit it to the supporting piles, thereby reducing the impact on the supporting piles.

[0020] Preferably, the cofferdam is provided with a plurality of ring beams arranged at intervals, and each inner corner of the cofferdam is provided with a plurality of diagonal braces.

[0021] By adopting the above technical solution, the stability of the cofferdam is improved by using ring beams and diagonal braces, and the impact of mixing pile construction on the cofferdam is reduced.

[0022] Preferably, the side of the steel sheet pile facing the inside of the cofferdam and the side of the locking steel pipe pile facing the inside of the cofferdam are both provided with an anti-sticking film. After the onshore side of the cofferdam is removed, cement slurry needs to be injected into the soil after the cofferdam is removed.

[0023] By adopting the above technical solution, since the horizontal shear force of the bridge on the pier is directed inward, the injection of cement slurry can prevent the pier from tilting or shifting due to the gap left after the cofferdam is removed.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: first construct a cofferdam to surround the foundation of the pedestal and construct support piles, then construct mixing piles to fill the space between the support piles, and connect the support piles into one through the mixing piles to improve the shear resistance and stability of the support piles and pedestal. In order to solve the problem of collision between the drill rod of the drilling rig and the support piles, when the present application constructs a circle of mixing piles around the support piles, the distance between the outer side of the drill rod of the drilling rig and the outer wall of the support pile is maintained in the range of 20-30cm, and for the soil between the drill rod of the drilling rig and the support piles that remain at this time, the cement slurry sprayed from the flushing pipe is used to impact, so that the soil collapses, and the cement slurry fills the space after the soil collapses, and the cement slurry is close to the outer wall of the support pile, so that the constructed mixing piles are closely combined with the support piles, and the support piles are connected into one through the mixing piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the distribution of support piles and cofferdams in a shear-resistant composite foundation treatment construction method for a silt geological bridge foundation in an embodiment of the present application.

[0026] Figure 2 It is a schematic diagram of the construction of a circle of mixing piles around the supporting piles of an embodiment of the present application.

[0027] Figure 3 yes Figure 2 Enlarged view of point A in .

[0028] Figure 4 It is a schematic diagram of the structure of the flushing tube of an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 1. Cofferdam; 2. Support piles; 3. Ring beam; 4. Diagonal brace; 5. Stabilizing frame; 6. Drilling rig; 7. Mud barrel; 8. Mud pump; 9. Slurry supply pump; 10. Drill rod; 11. Lifting mechanism; 12. Flushing pipe; 121. Pipe body; 122. End; 123. Nozzle; 13. Connecting rod. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] The embodiment of the present application discloses a construction method for treating a shear-resistant composite foundation of a bridge foundation in muddy geology.

[0033] A construction method for treating a shear-resistant composite foundation of a bridge foundation in mud geology comprises the following steps:

[0034] S1. Reference Figure 1, level the foundation, and construct a plurality of support piles 2 at the corresponding positions of the foundation to be treated according to the design drawings. The support piles 2 are steel pipe piles, and the upper ends of the support piles 2 extend to at least 2m above the ground. If the height above the ground from the upper ends of the inserted support piles 2 is less than the set value, the upper ends of the support piles 2 are extended to the set position above the ground by re-extending the support piles 2. After the foundation treatment is completed, the extended support piles 2 are removed. The upper ends of the support piles 2 in this embodiment are arranged at 5.5m above the ground. Steel sheet piles or locking steel pipe piles are inserted along the edge of the foundation to be treated to form a cofferdam 1. The upper end of the cofferdam 1 is 1-2m above the ground. The cofferdam 1 has an opening for entering and exiting the foundation. The present embodiment uses locking steel pipe piles, and the cofferdams 1 in the subsequent descriptions are all formed by inserting and driving locking steel pipe piles. The cofferdam 1 is provided with three ring beams 3 arranged at intervals, and the interval between two adjacent ring beams 3 is 2m. Three horizontally arranged diagonal braces 4 are respectively arranged at each inner corner of the cofferdam 1, and the diagonal braces 4 avoid the supporting piles 2 to improve the strength of the inner corners of the cofferdam 1. The locking steel pipe pile has an anti-adhesive film on the side facing the inside of the cofferdam 1, which is convenient for the removal of the cofferdam 1 after the foundation treatment is completed. The locking mouth of the locking steel pipe pile is coated with polyurethane foam to improve the sealing. The locking steel pipe pile adopts a 30m long φ820×12mm steel pipe pile. The locking mouth of the locking steel pipe pile adopts Co type, C type locking mouth adopts φ150×8mm seamless steel pipe, the slot angle is 45° and the width is 40mm, and the О type locking mouth adopts φ127×6mm seamless steel pipe.

[0035] S2, reference Figure 2 and Figure 3, use a mud barrel 7 to prepare cement slurry, and use a mud pump 8 to connect the drilling rig 6 and the mud barrel 7. The mud pump 8 extracts the cement slurry and supplies it to the drilling rig 6. During the drilling and lifting process of the drilling rig 6, the cement slurry is sprayed out and combined with the soil to form a mixing pile. Use the drilling rig 6 to construct the mixing piles in the cofferdam 1, starting with a circle of mixing piles around the central support pile 2, and then gradually constructing outward. Adjacent mixing piles bite each other, and the constructed mixing piles fill the space between the support piles 2. The mixing piles replace the silt geological soil between the support piles 2, and each support pile 2 is firmly connected to the foundation. When constructing a circle of mixing piles around the support pile 2, in order to prevent the drill rod 10 of the drilling rig 6 from damaging the support pile 2, the distance between the outer end of the mixing blade of the drill rod 10 of the drilling rig 6 and the outer wall of the support pile 2 is 20-30cm. Since the muddy geological soil between the drill rod 10 of the drill rig 6 and the support pile 2 cannot be stirred by the drill rig 6 to form a mixing pile, if this part of the soil is not treated, after the bridge construction, this part of the muddy geological soil may not be able to counteract the horizontal shear force of the support pile 2 and cause the support pile 2 to tilt. In order to replace the muddy geological soil between the drill rod 10 of the drill rig 6 and the support pile 2 with cement slurry to form a mixing pile, in the present embodiment, during the drilling process of the drill rod 10 of the drill rig 6, a flushing pipe 12 is used to spray cement slurry on the soil between the drill rod 10 of the drill rig 6 and the support pile 2. The flushing pipe 12 is connected to a slurry supply pump 9. The pressure of the cement slurry supplied by the slurry supply pump 9 to the flushing pipe 12 is 20-30Mpa. The flushing pipe 12 is vertically inserted along the outer wall of the supporting pile 2, and the flushing pipe 12 sprays a fan-shaped cement slurry water column in the direction of the drilling rig 6. The cement slurry sprayed from the flushing pipe 12 impacts and collapses the silt geological soil between the drill rod 10 of the drilling rig 6 and the supporting pile 2. The collapsed soil is impacted to the drill rod 10 of the drilling rig 6, and is stirred and crushed by the drill rod 10 of the drilling rig 6 and mixed with the cement slurry at the drill rod 10 of the drilling rig 6 to form new cement slurry, and the space after the soil collapses is filled with cement slurry, which forms a mixing pile after solidification. Since the soil between the drill rod 10 of the drilling rig 6 and the supporting pile 2 will gradually collapse due to the impact of the flushing pipe 12 as the drill rod 10 of the drilling rig 6 drills in, there is less soil that hinders the insertion of the flushing pipe 12, and the resistance to the insertion of the flushing pipe 12 is small. Therefore, in order to facilitate the insertion of the flushing pipe 12 and keep the flushing pipe 12 and the drill rod 10 of the drilling rig 6 synchronously penetrating into the soil, the flushing pipe 12 is connected to the lifting mechanism 11 of the drilling rig 6, and the flushing pipe 12 can rise and fall with the lifting mechanism 11 of the drilling rig 6. During the construction of the mixing pile, if the diagonal support 4 interferes with the drilling rig 6, the diagonal support 4 is removed first and then the construction is carried out. After the construction of the mixing pile at this position is completed and the drilling rig 6 is moved to another position, the diagonal support 4 is reinstalled back to its original position.

[0036] S3. After all the soil between the supporting piles 2 is replaced by the mixing piles and the prestressing conversion of the bridge is completed, the cofferdam 1 can be dismantled. The dismantling order of the cofferdam 1 is opposite to the insertion order of the cofferdam 1. First, the ring beam 3 and the diagonal brace 4 are dismantled, and then the piles are pulled out from the joint position of the cofferdam 1. When pulling out the piles, first use a vibrating hammer to vibrate the lock of the steel pipe piles of the cofferdam 1 to reduce the resistance of the soil, and then pull out while vibrating, with an amplitude of 10-20mm. The power supply for the vibrating hammer should be 1.2 to 2.0 times the rated power of the motor of the vibrating hammer itself. For steel pipe piles with large pulling resistance, intermittent vibration method is used for each vibration for 15 minutes, and the vibrating hammer should not work continuously for more than 1.5 hours. After the onshore side of the cofferdam 1 is dismantled, cement slurry needs to be injected into the soil after the cofferdam 1 is dismantled to fill the holes left after the cofferdam 1 is dismantled.

[0037] Reference Figure 2 Before constructing a circle of mixing piles around the support pile 2, in order to reduce the impact of the mixing pile construction on the stability of the support pile 2, the support pile 2 is first fixedly connected to the surrounding support piles 2 using a stabilizing frame 5, and the stabilizing frame 5 avoids the position of the drilling rig 6. The stabilizing frame 5 is built with steel pipes, and the method of connecting the stabilizing frame 5 to the support pile 2 is the same as the method of scaffolding columns. During the construction of the mixing pile, the position and angle of the support pile 2 are monitored in real time. If the support pile 2 is tilted or displaced, the drilling rig 6 is stopped immediately, and the support pile 2 is reinforced before continuing the construction of the mixing pile. The reinforcement measures for the support pile 2 include using cables for oblique reinforcement, adding stabilizing frames 5 for reinforcement, and installing support rods on the other side of the construction mixing pile to connect the ground and the support pile 2. When constructing a circle of mixing piles around the support pile 2, the arc of the contact surface between the soil flushed by the flushing pipe 12 and the support pile 2 is not greater than 40° to keep the support pile 2 stable.

[0038] Reference Figure 3 and Figure 4The flushing pipe 12 includes a pipe body 121, a terminal 122 and a nozzle 123. The lower end of the pipe body 121 is provided with an internal thread, and the upper end of the pipe body 121 is provided with an external thread. The pipe body 121 can be extended by an extension pipe, and the lower end of the extension pipe is threadedly connected to the upper end of the pipe body 121. The lower end of the extension pipe and the upper end of another section of the extension pipe can be threadedly connected to each other. The terminal 122 is threadedly connected to the lower end of the pipe body 121, and the terminal 122 is conical, which is convenient for insertion into the soil. The side wall of the lower end of the pipe body 121 is provided with a plurality of notches, and the plurality of notches are distributed along the axial direction of the pipe body 121 and are all arranged on the same side of the pipe body 121. The nozzle 123 is installed in the notch, and the upper end of the pipe body 121 is connected to the lifting mechanism 11 of the drilling rig 6 through the connecting rod 13, and the connecting rod 13 is connected to the lifting mechanism 11 through bolts, which is convenient for disassembly and assembly. If the pipe body 121 is extended by an extension pipe, the connecting rod 13 connects the lifting mechanism 11 and the extension pipe of the drilling machine 6. The connecting rod 13 is arranged horizontally, and the connecting rod 13 is a telescopic rod, and the spray holes of the spray head 123 are distributed in a fan shape toward the drilling machine 6. If the mixing pile to be constructed is a mixing pile at a position other than the circle around the supporting pile 2, the bolts connecting the connecting rod 13 and the lifting mechanism 11 are loosened, and then the flushing pipe 12 is removed and placed in disuse.

[0039] The implementation principle of the construction method for treating the shear-resistant composite foundation of a silt geological bridge foundation in the embodiment of the present application is as follows: first, a cofferdam 1 is constructed to surround the foundation of the cap and support piles 2 are constructed, and then a mixing pile is constructed to fill the space between each support pile 2, and each support pile 2 is connected into one by a mixing pile, so as to improve the shear resistance and stability of the support pile 2 and the cap. Since the mixing piles of the present application fill the space between each support pile 2, it is used to reinforce the soil between the piles and connect each support pile 2 into one, instead of being conventionally arranged at intervals in the foundation to improve the bearing capacity of the foundation, after the construction of the mixing piles, the entire foundation is solidified into one, and the construction of the support piles 2 requires squeezing the soil, which will increase the construction cost and difficulty of the support piles 2. Therefore, the support piles 2 of the present application are constructed before the mixing piles to solve the above problems. If the mixing piles are constructed after the construction of the support piles 2, the construction of the mixing piles may affect the stability of the support piles 2, especially when the mixing piles around the support piles 2 are constructed, the drill rod 10 of the drilling rig 6 is easy to collide with the support piles 2 and cause damage to the support piles 2. In order to solve the problem of collision between the drill rod 10 of the drilling rig 6 and the supporting pile 2, when constructing a circle of mixing piles around the supporting pile 2, the distance between the outer side of the drill rod 10 of the drilling rig 6 and the outer wall of the supporting pile 2 is maintained in the range of 20-30cm. As for the soil between the drill rod 10 of the drilling rig 6 and the supporting pile 2 that remains at this time, cement slurry sprayed from the flushing pipe 12 is used to impact it, so that the soil collapses toward the drill rod 10 of the drilling rig 6. The collapsed soil is crushed and mixed with the cement slurry after being crushed and mixed by the drill rod 10. The cement slurry fills the space after the soil collapses and adheres to the outer wall of the supporting pile 2 to form a mixing pile that adheres to the supporting pile 2, so that the constructed mixing pile is closely combined with the supporting pile 2, and the supporting piles 2 are connected into one through the mixing piles, thereby improving the shear resistance and stability of the supporting piles 2 and the foundation.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for treating shear-resistant composite foundation of a bridge foundation in mud geology, characterized in that: The following steps are involved: According to the design drawings, a plurality of supporting piles (2) are constructed at corresponding positions of the foundation; and steel sheet piles or locking steel pipe piles are inserted to form a cofferdam (1) outside the range of the supporting piles (2); A mud barrel (7) is used to prepare cement slurry, and a mud pump (8) is used to connect the drilling rig (6) and the mud barrel (7); the drilling rig (6) is used to construct mixing piles in the cofferdam (1), and the mixing piles fill the space between the supporting piles (2); when constructing a circle of mixing piles around the supporting piles (2), the distance between the outer side of the drill rod (10) of the drilling rig (6) and the outer wall of the supporting pile (2) is 20-30 cm. As the drill rod (10) of the drilling rig (6) drills, a flushing pipe (12) is used to spray cement slurry on the soil between the drill rod (10) of the drilling rig (6) and the supporting pile (2). The cement slurry sprayed by the flushing pipe (12) impacts the soil between the drill rod (10) of the drilling rig (6) and the supporting pile (2) to collapse to the mixing pile, and the collapsed soil is mixed with the cement slurry of the mixing pile to form new cement slurry and fill the space after the soil collapses; After all the soil between the supporting piles (2) is replaced by the mixing piles, the cofferdam (1) is removed; Before constructing a circle of mixing piles around a certain supporting pile (2), a stabilizing frame (5) is first used to fix the supporting pile (2) and surrounding supporting piles (2) to each other, and the stabilizing frame (5) is kept away from the position of the drilling machine (6); A flushing pipe (12) is inserted along the outer wall of the support pile (2), and the flushing pipe (12) is connected to the lifting mechanism (11) of the drilling rig (6) and rises and falls with the lifting mechanism (11) of the drilling rig (6); The flushing pipe (12) comprises a pipe body (121), an end head (122) and a nozzle (123); the end head (122) is mounted on one end of the pipe body (121); a side wall of the pipe body (121) connected to the end head (122) is provided with a notch; the nozzle (123) is mounted in the notch; the end of the pipe body (121) away from the end head (122) is connected to the lifting mechanism (11) of the drilling rig (6) via a connecting rod (13); the connecting rod (13) is a telescopic rod; and the spray hole of the nozzle (123) faces the drilling rig (6).

2. The method for treating the shear-resistant composite foundation of a bridge foundation in muddy geology according to claim 1 is characterized by: The stabilizing frame (5) is constructed using steel pipes, and the method of connecting the stabilizing frame (5) to the supporting piles (2) is the same as the method of holding the scaffolding columns.

3. The method for treating the shear-resistant composite foundation of a bridge foundation in muddy geology according to claim 1 is characterized by: The flushing pipe (12) is connected to a slurry supply pump (9), and the pressure of cement slurry supplied to the flushing pipe (12) by the slurry supply pump (9) is 20-30 MPa.

4. The method for treating the shear-resistant composite foundation of a bridge foundation in muddy geology according to claim 1 is characterized by: The cofferdam (1) is provided with a plurality of ring beams (3) arranged at intervals, and each inner corner of the cofferdam (1) is provided with a plurality of diagonal braces (4).

5. The method for treating the shear-resistant composite foundation of a bridge foundation in muddy geology according to claim 1 is characterized by: The side of the steel sheet pile or the locking steel pipe pile facing the inside of the cofferdam (1) is provided with an anti-adhesive film. After the onshore side of the cofferdam (1) is removed, cement slurry needs to be injected into the soil after the cofferdam (1) is removed.

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