Construction method of cast-in-place blade foot ring for assembled caisson

Abstract

The invention discloses a method for constructing a cast-in-situ blade foot ring suitable for an assembled caisson, comprising the following steps: 1. connecting a plurality of blade foot lower outer steel shells (4) end to end to form a lower structure of the blade foot (20); 2. pre-embedding through-length bolts (6) in the blade foot lower outer steel shell; 3. pouring lower concrete (7) in the blade foot lower outer steel shell; 4. assembling a blade foot upper outer steel shell (8) above the blade foot lower outer steel shell, and connecting a plurality of blade foot upper outer steel shells end to end to form an upper structure of the blade foot; 5. installing multiple groups of support plates on the top surface of the blade foot; 6. suspending a first ring pipe segment (14) on the support plate, passing through the first ring pipe segment with through-length bolts, and connecting a plurality of first ring pipe segments end to end to form a first ring pipe segment; 7. pouring upper concrete (16) in the blade foot to form a blade foot ring (21); 8. connecting the first ring pipe segment and the blade foot upper outer steel shell, connecting the blade foot ring and the first ring pipe segment, and curing the concrete. The present invention can ensure the casting-in-situ construction accuracy of the blade foot ring and is convenient for connecting prefabricated pipe segments.

Description

Technical Field

[0001] The invention relates to a construction method of a caisson structure, in particular to a construction method of a cast-in-situ blade foot ring suitable for an assembled caisson. Background Art

[0002] With the continuous development of cities, urban land resources are becoming increasingly scarce, and the development of underground space is becoming an increasingly important trend in future urban development. When constructing deep underground spaces in densely populated urban centers, the construction site is often limited and the surrounding environment is complex. Furthermore, excavation of foundation pits often causes a drop in the groundwater level and the movement and subsidence of surrounding soil. In severe cases, this can cause the surrounding strata to collapse, severely impacting adjacent structures. The use of prefabricated caisson construction methods for constructing deep underground spaces can effectively avoid this situation.

[0003] The blade foot ring is one of the important structures in the construction method of prefabricated caissons. At present, the blade foot rings in the existing technology are mostly formed by cast-in-place reinforced concrete or prefabricated structure assembly. However, for prefabricated caisson structures, if the conventional cast-in-place reinforced concrete structure is used to construct the blade foot ring, the blade foot ring has an arc surface structure, and the casting construction accuracy is difficult to guarantee, and the flatness of the end face of the blade foot ring is poor, resulting in great difficulties in connecting the cast-in-place blade foot ring with the first ring prefabricated pipe segment. If the blade foot ring is formed by assembling a prefabricated structure, although the construction accuracy can be improved, the structural integrity is poor, and there is a risk of water and soil leakage at the joints; at the same time, the height of the blade foot ring is different under different geological conditions and structural types, and multiple sets of blade foot ring production molds need to be configured, which is not economical. Therefore, it is necessary to provide a cast-in-place blade foot ring construction method suitable for prefabricated caissons that can ensure the cast-in-place construction accuracy of the blade foot ring and facilitate the connection of prefabricated pipe segments. Summary of the Invention

[0004] The purpose of the present invention is to provide a cast-in-situ blade foot ring construction method suitable for assembled caissons, which can ensure the cast-in-situ construction accuracy of the blade foot ring and facilitate the connection of prefabricated pipe segments.

[0005] The present invention is achieved in that:

[0006] A method for constructing a cast-in-place blade foot ring for an assembled caisson comprises the following steps:

[0007] Step 1: Adjustably install the lower outer steel shell of the blade foot on the construction site. Connect several lower outer steel shells of the blade foot end to end to form a ring structure, which serves as the lower structure of the blade foot.

[0008] Step 2: Embed full-length bolts in the outer steel shells at the lower parts of several blade feet;

[0009] Step 3: Pour lower concrete into the outer steel shells at the lower parts of several blade feet;

[0010] Step 4: Assemble the upper outer steel shells of the blade foot on top of the lower outer steel shells of the blade foot. Connect the upper outer steel shells of the blade foot end to end to form a ring structure as the upper structure of the blade foot. The upper structure and the lower structure are assembled to form the blade foot.

[0011] Step 5: Install multiple sets of support plates on the top surface of the blade foot at intervals;

[0012] Step 6: Hang the first ring segments on the multiple sets of support plates on the top surface of the blade foot, so that the full-length bolts pass through the first ring segments. Several first ring segments are connected end to end in sequence to form a first ring segment;

[0013] Step 7: Pour upper concrete inside the blade foot; the blade foot lower outer steel shell, the blade foot upper outer steel shell, the lower concrete and the upper concrete form a blade foot ring;

[0014] Step 8: Connect the first ring segment to the upper outer steel shell of the blade foot to seal the blade foot ring and the first ring segment, and perform concrete curing.

[0015] Described step 1 comprises the following sub-steps:

[0016] Step 1.1: Compact and level the construction site;

[0017] Step 1.2: Arrange several leveling and lifting devices on the construction site. The leveling and lifting devices are arranged on the inner side of the blade foot along the circumference of the blade foot.

[0018] Step 1.3: Install the blade foot connector on the movable end of each leveling jacking device;

[0019] Step 1.4: Install the lower outer steel shells of several blade feet on the outside of several leveling and lifting devices through the blade foot connectors. The top and both sides of the lower outer steel shells of the blade feet are not closed. The lower outer steel shells of several blade feet are connected end to end in sequence to form a through ring structure, which serves as the lower structure of the blade foot.

[0020] Described step 2 comprises the following sub-steps:

[0021] Step 2.1: Install bolt connectors inside the outer steel shell at the lower part of the blade foot, so that the bolt connectors are located directly below the bolt holes reserved in the first ring segment;

[0022] Step 2.2: Fix the lower end of the through-length bolt to the bolt connector. The through-length bolt is set vertically and passes upward through the outer steel shell at the lower part of the blade foot. The top surface elevation of the through-length bolt is higher than the top surface elevation of the first ring segment.

[0023] In step 3, when pouring the lower concrete, the liquid level of the lower concrete is higher than the bolt connection.

[0024] The top, bottom and both sides of the upper outer steel shell of the blade foot are not closed, so that the upper outer steel shell of the blade foot is connected with the lower outer steel shell of the blade foot, and several upper outer steel shells of the blade feet are connected end to end in sequence to form a through ring structure.

[0025] The top width of the outer steel shell on the blade foot is greater than the bottom width of the first ring segment, and a plurality of concrete distribution holes are preset at intervals on the inner side of the top of the outer steel shell on the blade foot.

[0026] Each group of support plates includes a temporary support plate, a bolt positioning plate and a shear pin connecting plate. The temporary support plate, the bolt positioning plate and the shear pin connecting plate are arranged at intervals and can be supported on the bottom surface of the first ring pipe segment; wherein, a bolt through hole is formed on the bolt positioning plate, so that the full-length bolt passes through the bolt through hole and penetrates the bolt positioning plate; a shear pin hole is formed on the shear pin connecting plate, and a shear pin is embedded in the shear pin hole.

[0027] A shear pin hole is reserved at the bottom of the first ring segment so that the shear pin on the shear pin connecting plate can be inserted into the shear pin hole at the bottom of the first ring segment, so that the outer wall of the first ring segment is flush with the outer wall of the blade foot.

[0028] The step 7 includes the following sub-steps:

[0029] Step 7.1: Install a concrete delivery pipe at the concrete distribution hole, and pour concrete into the blade foot through the concrete delivery pipe using concrete pumping equipment;

[0030] Step 7.2: Insert a concrete vibrator into the blade foot through the gap between the support plates and vibrate the concrete during the pouring process;

[0031] Step 7.3: Reserve a concrete overflow hole at the top of the outer wall of the outer steel shell above the blade foot. When the concrete overflows from the concrete overflow hole, stop pouring the concrete and pour the upper concrete on top of the lower concrete to form the upper concrete.

[0032] A first connecting plate is embedded in the bottom of the first ring segment, and the first connecting plate is welded and fixed to the outer wall of the outer steel shell of the upper part of the blade foot through the second connecting plate, and the first connecting plate and the second connecting plate are used to seal the concrete overflow hole and the joint between the blade foot ring and the first ring segment.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The present invention adopts the method of splicing the lower outer steel shell of the blade foot and the upper outer steel shell of the blade foot to form the blade foot, and partially pouring concrete inside the blade foot to form a blade foot ring, thereby ensuring the structural integrity and construction accuracy of the blade foot ring, solving the problem of difficulty in connecting the cast-in-place blade foot ring and the prefabricated pipe section in the prior art, and can be cast in-place according to the design requirements of the blade foot ring, without the need to configure multiple sets of blade foot ring production molds, thereby reducing the construction cost of the blade foot ring.

[0035] 2. The present invention adopts a first connecting plate and a second connecting plate. The first connecting plate is embedded in the bottom of the prefabricated first ring segment. The first connecting plate and the upper outer steel shell of the blade foot are welded through the second connecting plate, thereby ensuring a closed connection between the blade foot ring and the first ring segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a construction diagram of a cast-in-situ blade foot ring construction method applicable to an assembled caisson according to the present invention;

[0037] Figure 2 yes Figure 1 A magnified schematic diagram of point A in the middle;

[0038] Figure 3 It is a schematic plan view of the outer steel shell of the upper portion of the blade foot of the cast-in-situ blade foot ring construction method applicable to the assembled caisson of the present invention;

[0039] Figure 4 The present invention is a planar schematic diagram of a blade foot of a cast-in-situ blade foot ring construction method applicable to an assembled caisson.

[0040] In the figure, 1 is the construction site, 2 is the leveling and lifting device, 3 is the blade foot connector, 4 is the lower outer steel shell of the blade foot, 5 is the bolt connector, 6 is the full-length bolt, 7 is the lower concrete, 8 is the upper outer steel shell of the blade foot, 9 is the concrete distribution hole, 10 is the concrete overflow hole, 11 is the temporary support plate, 12 is the bolt through hole, 13 is the shear pin hole, 14 is the first ring segment, 15 is the concrete delivery pipe, 16 is the upper concrete, 17 is the concrete vibrator, 18 is the first connecting plate, 19 is the second connecting plate, 20 is the blade foot, 21 is the blade foot ring, 22 is the bolt positioning plate, and 23 is the shear pin connecting plate. DETAILED DESCRIPTION

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] Please see the attached Figure 1 To the attached Figure 4 A method for constructing a cast-in-place blade foot ring for an assembled caisson comprises the following steps:

[0043] Please see the attached Figure 1 Step 1: The lower outer steel shell 4 of the blade foot is adjustably installed on the construction site 1. Several lower outer steel shells 4 of the blade foot are connected end to end to form a ring structure as the lower structure of the blade foot 20.

[0044] Described step 1 comprises the following sub-steps:

[0045] Step 1.1: Compact and level the construction site 1 to ensure the cast-in-place quality of the blade foot ring 21 .

[0046] Step 1.2: Arrange a plurality of leveling and lifting devices 2 on the construction site 1 . The plurality of leveling and lifting devices 2 are arranged on the inner side of the blade foot 20 along the circumference of the blade foot 20 .

[0047] Preferably, the leveling and lifting device 2 can use existing equipment such as cylinders and jacks to adjust the installation height of the lower outer steel shell 4 of the blade foot, thereby achieving leveling of the lower structure of the blade foot 20 and reducing the horizontal and elevation deviations at the center of the blade foot ring 21.

[0048] Step 1.3: Install the blade foot connector 3 on the movable end of each leveling and lifting device 2.

[0049] The structural form of the blade foot connector 3 can be selected according to actual construction requirements. Preferably, the blade foot connector 3 can be made of angle steel and bolts. The bottom of the blade foot connector 3 is fixed on the movable end of the leveling and jacking device 2, and the side of the blade foot connector 3 is connected to the lower outer steel shell 4 of the blade foot through bolts, so as to realize the stable installation of the lower outer steel shell 4 of the blade foot on the leveling and jacking device 2, which facilitates the leveling operation of the lower outer steel shell 4 of the blade foot by the leveling and jacking device 2.

[0050] Step 1.4: Install several blade foot lower outer steel shells 4 on the outside of several leveling and lifting devices 2 through the blade foot connectors 3 respectively. The top and both sides of the blade foot lower outer steel shells 4 are not closed, so that several blade foot lower outer steel shells 4 are connected end to end in sequence to form a through ring structure, which serves as the lower structure of the blade foot 20.

[0051] The shape and quantity of the blade foot lower outer steel shell 4 can be determined according to the design size of the blade foot ring 21. Preferably, four pieces of quarter-arc structure blade foot lower outer steel shells 4 are assembled to form the lower structure of the circular blade foot 20, and the blade foot lower outer steel shells 4 are connected end to end to form a ring structure.

[0052] Please see the attached Figure 1 Step 2: Embed full-length bolts 6 in the outer steel shells 4 at the lower parts of the plurality of blade feet.

[0053] Described step 2 comprises the following sub-steps:

[0054] Step 2.1: Install the bolt connector 5 in the outer steel shell 4 at the lower portion of the blade foot, so that the bolt connector 5 is located directly below the bolt hole reserved in the first ring segment 14 .

[0055] The bolt connector 5 can be a threaded sleeve or the like in the prior art according to actual needs, and can be arranged according to the installation design position of the first ring segment 14 and the position of the bolt holes therein.

[0056] Step 2.2: Fix the lower end of the through-length bolt 6 to the bolt connector 5. The through-length bolt 6 is vertically arranged and passes upward through the outer steel shell 4 at the lower part of the blade foot. The top surface elevation of the through-length bolt 6 is higher than the top surface elevation of the first ring segment 14.

[0057] The through-length bolts 6 are screwed or welded to the bolt connector 5 . The size and specification of the through-length bolts 6 can be selected according to the design requirements of the blade foot ring 21 and the first ring segment 14 .

[0058] Please see the attached Figure 1 Step 3: Pour lower concrete 7 into the lower structure of the blade foot 20, that is, several blade foot lower outer steel shells 4.

[0059] In the step 3, when pouring the lower concrete 7, the liquid level of the lower concrete 7 is higher than the bolt connector 5. The liquid level of the lower concrete 7 can be adjusted according to the actual construction situation to ensure that the position of the bolt connector 5 does not change after the lower concrete 7 solidifies.

[0060] Please see the attached Figure 1 Step 4: Assemble the upper outer steel shell 8 of the blade foot above several lower outer steel shells 4 of the blade foot. Several upper outer steel shells 8 of the blade foot are connected end to end in sequence to form a ring structure, which serves as the upper structure of the blade foot 20. The upper structure and the lower structure are assembled to form the blade foot 20.

[0061] The top, bottom and both sides of the blade foot upper outer steel shell 8 are not closed, so that the blade foot upper outer steel shell 8 is connected with the blade foot lower outer steel shell 4, and several blade foot upper outer steel shells 8 are connected end to end in sequence to form a through ring structure.

[0062] The shape and number of the blade foot upper outer steel shell 8 can be determined according to the design dimensions of the blade foot ring 21. The bottom shape and dimensions of the blade foot upper outer steel shell 8 are consistent with the top shape and dimensions of the blade foot lower outer steel shell 4 to ensure that the blade foot upper outer steel shell 8 is assembled on top of the blade foot lower outer steel shell 4. Preferably, four pieces of the blade foot upper outer steel shell 8 with a quarter-circular arc structure are assembled to form the annular upper structure of the blade foot 20, and the blade foot upper outer steel shells 8 are connected end to end to form a ring structure.

[0063] Please see the attached Figure 2 The top width of the outer steel shell 8 of the blade foot is greater than the bottom width of the first ring segment 14, and a plurality of concrete distribution holes 9 are preset at intervals on the inner side of the top of the outer steel shell 8 of the blade foot.

[0064] Multiple concrete distribution holes 9 are located inside the installation location of the first ring segment 14. This facilitates pouring and vibrating concrete into the blade foot 20 through the multiple concrete distribution holes 9 after the first ring segment 14 is installed. The number of concrete distribution holes 9 on the outer steel shell 8 above each blade foot can be determined based on the actual concrete pouring requirements during construction.

[0065] Please see the attached Figure 3 and attached Figure 4 Step 5: Install multiple sets of support plates at intervals on the top surface of the blade foot 20, that is, the top surface of the outer steel shell 8 on the upper part of the blade foot.

[0066] Please see the attached Figure 3 and attached Figure 4 Each group of support plates includes a temporary support plate 11, a bolt positioning plate 22 and a shear pin connecting plate 23. The temporary support plate 11, the bolt positioning plate 22 and the shear pin connecting plate 23 are arranged at intervals and can be supported on the bottom surface of the first ring pipe segment 14; wherein, a bolt through hole 12 is formed on the bolt positioning plate 22, so that the full-length bolt 6 passes through the bolt through hole 12 and penetrates the bolt positioning plate 22, and a shear pin hole 13 is formed on the shear pin connecting plate 23, and a shear pin is embedded in the shear pin hole 13.

[0067] The temporary support plate 11, the bolt positioning plate 22 and the shear pin connection plate 23 can provide effective support for the first ring segment 14. The bolt positioning plate 22 can be used for the penetration and positioning of the through-length bolts 6, and the shear pin connection plate 23 can be used for positioning and connecting with the first ring segment 14.

[0068] Please see the attached Figure 1 and attached Figure 2 Step 6: Hang the first ring segments 14 on multiple groups of support plates on the top surface of the blade foot 20, so that the full-length bolts 6 pass through the bolt holes reserved in the first ring segments 14 and penetrate the first ring segments 14. Several first ring segments 14 are connected end to end in sequence to form a first ring pipe section.

[0069] A shear pin hole is reserved at the bottom of the first ring segment 14, so that the shear pin on the shear pin connecting plate 23 can be inserted into the shear pin hole at the bottom of the first ring segment 14, so that the outer wall of the first ring pipe section is flush with the outer wall of the blade foot 20, which facilitates the rapid and accurate lifting and positioning of the first ring segment 14.

[0070] Please see the attached Figure 1 and attached Figure 2 , Step 7: Pour the upper concrete 16 into the blade foot 20; the blade foot lower outer steel shell 4, the blade foot upper outer steel shell 8, the lower concrete 7 and the upper concrete 16 constitute a blade foot ring 21.

[0071] Installing the first pipe ring first and then pouring the upper concrete 16 can improve the cast-in-place flatness of the blade foot ring 21, thereby better connecting the blade foot ring 21 and the first pipe ring.

[0072] The step 7 includes the following sub-steps:

[0073] Step 7.1: Install a concrete delivery pipe 15 at the concrete distribution hole 9, and pour concrete into the blade foot 20 through the concrete delivery pipe 15 using concrete pumping equipment.

[0074] Step 7.2: Insert the concrete vibrator 17 into the blade foot 20 through the gap between the support plates, and vibrate the concrete during the pouring process to ensure the pouring density of the concrete.

[0075] Step 7.3: Reserve a concrete overflow hole 10 at the top of the outer wall of the outer steel shell 8 above the blade foot. When the concrete overflows from the concrete overflow hole 10, stop pouring the concrete and pour the upper concrete 16 on top of the lower concrete 7.

[0076] Please see the attached Figure 1 and attached Figure 2 Step 8: Connect the first ring segment 14 and the upper outer steel shell 8 of the blade foot, so that the blade foot ring 21 is closed and connected to the first ring pipe segment, and perform concrete curing.

[0077] A first connecting plate 18 is embedded in the bottom of the first ring segment 14, and the first connecting plate 18 is welded and fixed to the outer wall of the upper outer steel shell 8 of the blade foot through the second connecting plate 19, and the first connecting plate 18 and the second connecting plate 19 seal the concrete overflow hole 10 and the joint between the blade foot ring 21 and the first ring segment.

[0078] The first connecting plate 18 is embedded when the first ring segment 14 is prefabricated to prevent the concrete slurry from overflowing from the concrete overflow hole 10 during the curing process and to avoid the risk of water and soil leakage outside the caisson at the joint.

[0079] After the concrete strength meets the design requirements, the cast-in-place construction of the blade foot ring 21 is completed.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for constructing cast-in-situ blade foot rings for assembled caissons, characterized by: The following steps are involved: Step 1: Adjustably install the blade foot lower outer steel shell (4) on the construction site (1), and connect several blade foot lower outer steel shells (4) end to end in sequence to form a ring structure as the lower structure of the blade foot (20); Step 2: pre-embed full-length bolts (6) in the outer steel shells (4) at the lower parts of the plurality of blade feet; Step 3: pouring lower concrete (7) into the lower outer steel shells (4) of the plurality of blade feet; Step 4: Assembling the upper outer steel shells (8) of the blade foot on top of the plurality of lower outer steel shells (4) of the blade foot, and sequentially connecting the upper outer steel shells (8) of the blade foot end to end to form a ring structure as the upper structure of the blade foot (20), and assembling the upper structure and the lower structure to form the blade foot (20); Step 5: Install multiple sets of support plates at intervals on the top surface of the blade foot (20); Step 6: Hanging the first ring segments (14) on the multiple sets of support plates on the top surface of the blade foot (20), so that the full-length bolts (6) pass through the first ring segments (14), and several first ring segments (14) are connected end to end in sequence to form a first ring pipe section; Step 7: pouring upper concrete (16) in the blade foot (20); the blade foot lower outer steel shell (4), the blade foot upper outer steel shell (8), the lower concrete (7) and the upper concrete (16) form a blade foot ring (21); Step 8: Connect the first ring segment (14) and the upper outer steel shell of the blade foot (8), connect the blade foot ring (21) and the first ring segment, and perform concrete curing.

2. The cast-in-situ blade foot ring construction method for an assembled caisson according to claim 1 is characterized by: Described step 1 comprises the following sub-steps: Step 1.1: Compact and level the construction site (1); Step 1.2: Arrange a plurality of leveling and lifting devices (2) on the construction site (1), wherein the plurality of leveling and lifting devices (2) are arranged on the inner side of the blade foot (20) along the circumference of the blade foot (20); Step 1.3: Install a blade foot connector (3) on the movable end of each leveling and lifting device (2); Step 1.4: Several blade foot lower outer steel shells (4) are respectively installed on the outer sides of several leveling and lifting devices (2) through blade foot connectors (3). The top and both sides of the blade foot lower outer steel shells (4) are not closed, so that several blade foot lower outer steel shells (4) are connected end to end in sequence to form a through ring structure, which serves as the lower structure of the blade foot (20).

3. The cast-in-situ blade foot ring construction method for assembled caisson according to claim 1 is characterized by: Described step 2 comprises the following sub-steps: Step 2.1: Arrange a bolt connector (5) in the outer steel shell (4) at the lower portion of the blade foot, so that the bolt connector (5) is located directly below the bolt hole reserved in the first ring segment (14); Step 2.2: Fix the lower end of the through-length bolt (6) on the bolt connector (5). The through-length bolt (6) is vertically arranged and passes through the lower outer steel shell (4) of the blade foot upwards, and the top surface elevation of the through-length bolt (6) is higher than the top surface elevation of the first ring segment (14).

4. The method for constructing cast-in-situ blade foot rings for assembled caissons according to claim 1 is characterized in that: In the step 3, when pouring the lower concrete (7), the liquid level of the lower concrete (7) is higher than the bolt connector (5).

5. The cast-in-situ blade foot ring construction method for assembled caisson according to claim 1 is characterized by: The top, bottom and both sides of the upper outer steel shell (8) of the blade foot are not closed, so that the upper outer steel shell (8) of the blade foot is connected with the lower outer steel shell (4) of the blade foot, and several upper outer steel shells (8) of the blade foot are connected end to end in sequence to form a through ring structure.

6. The method for constructing a cast-in-situ blade foot ring for an assembled caisson according to claim 1 or 5, characterized in that: The top width of the outer steel shell (8) on the blade foot is greater than the bottom width of the first ring segment (14), and a plurality of concrete distribution holes (9) are preset at intervals on the inner side of the top of the outer steel shell (8) on the blade foot.

7. The method for constructing a cast-in-situ blade foot ring for an assembled caisson according to claim 1, wherein: Each group of support plates includes a temporary support plate (11), a bolt positioning plate (22) and a shear pin connecting plate (23). The temporary support plate (11), the bolt positioning plate (22) and the shear pin connecting plate (23) are arranged at intervals and can be supported on the bottom surface of the first ring pipe segment (14); wherein, a bolt through hole (12) is formed on the bolt positioning plate (22), so that the full-length bolt (6) passes through the bolt through hole (12) and penetrates the bolt positioning plate (22); a shear pin hole (13) is formed on the shear pin connecting plate (23), and a shear pin is embedded in the shear pin hole (13).

8. The method for constructing a cast-in-situ blade foot ring for an assembled caisson according to claim 7 is characterized by: A shear pin hole is reserved at the bottom of the first ring segment (14), so that the shear pin on the shear pin connecting plate (23) can be inserted into the shear pin hole at the bottom of the first ring segment (14), so that the outer wall of the first ring segment is flush with the outer wall of the blade foot (20).

9. The cast-in-situ blade foot ring construction method for assembled caisson according to claim 1 is characterized by: Described step 7 comprises the following sub-steps: Step 7.1: Install a concrete delivery pipe (15) at the concrete distribution hole (9), and pour concrete into the blade foot (20) through the concrete delivery pipe (15) using concrete pumping equipment; Step 7.2: Insert a concrete vibrator (17) into the blade foot (20) through the gap between the support plates and vibrate the concrete during the pouring process; Step 7.3: Reserve a concrete overflow hole (10) on the top of the outer wall of the upper outer steel shell (8) of the blade foot. When the concrete overflows from the concrete overflow hole (10), stop pouring the concrete and pour the upper concrete (16) on top of the lower concrete (7).

10. The method for constructing cast-in-situ blade foot rings for assembled caissons according to claim 1 is characterized in that: A first connecting plate (18) is pre-buried at the bottom of the first ring segment (14), and the first connecting plate (18) is welded and fixed to the outer wall of the upper outer steel shell (8) of the blade foot through the second connecting plate (19), and the first connecting plate (18) and the second connecting plate (19) close the concrete overflow hole (10) and the joint between the blade foot ring (21) and the first ring segment.

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