Cofferdam structure and construction method thereof

Abstract

The invention belongs to the technical field of cofferdam construction, and particularly relates to a cofferdam structure and a construction method thereof.The cofferdam structure comprises a cofferdam mechanism and a pile column, a reinforcing mechanism is arranged on the cofferdam mechanism, a grouting pipe is arranged below the reinforcing mechanism, the grouting pipe is used for slurry grouting to generate a sealing base, and the pile column is arranged below the reinforcing mechanism; the cofferdam mechanism comprises a first mounting column, and the first mounting column is fixedly connected to the top of the pile column. According to the cofferdam structure and the construction method thereof, through use of the cofferdam mechanism, the piles, the grouting pipes and the sealing base, the first mounting column, the second mounting column and the piles can be stably inserted into a lathe, the outer plate and the inner plate can be stably inserted into side grooves of the first mounting column and the second mounting column, and then through filling of the reinforcing layer, the stability of the outer plate is effectively guaranteed; and meanwhile, the sealing base is generated through grouting of the grouting pipe, the sealing performance of the cofferdam can be further improved, gradual water accumulation in the cofferdam structure is prevented, and stable engineering construction in the cofferdam structure is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of cofferdam construction, in particular to a cofferdam structure and a construction method thereof. Background Art

[0002] A cofferdam refers to a temporary retaining structure built for the construction of permanent water conservancy facilities during water conservancy project construction. Its function is to prevent water and soil from entering the construction site of the building so that drainage can be drained within the cofferdam, foundation pits can be excavated, and buildings can be constructed.

[0003] At present, in the prior art, for example, a Chinese patent with publication number CN 115949082 B discloses a cofferdam structure and a construction method thereof. The device uses main load-bearing piles and inner water retaining plates to provide support for the outer weir structure, so that they can jointly block the impact of water flow, thereby improving the impact resistance of the outer weir structure, thereby ensuring the safety of subsequent construction and further improving construction safety.

[0004] However, during actual use of the device, due to the impact of water flow, the sealing of the bottom of the outer weir structure is poor under the impact, and the water flow can enter the cofferdam structure through the bottom of the outer weir structure, causing water to gradually accumulate in the cofferdam structure, affecting the construction in the cofferdam structure. Summary of the invention

[0005] The main purpose of the present invention is to provide a cofferdam structure and a construction method thereof, which can solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention proposes the following technical solutions:

[0007] A cofferdam structure comprises a cofferdam mechanism and a pile column, wherein a reinforcement mechanism is arranged on the cofferdam mechanism, a grouting pipe is arranged below the reinforcement mechanism, and the grouting pipe is used for grouting mud to generate a sealing base, and the cofferdam mechanism comprises:

[0008] A first mounting column, wherein the first mounting column is fixedly connected to the top of the pile column;

[0009] A second mounting column, wherein an outer plate and an inner plate are slidably connected in side grooves on the side walls of the second mounting column and the first mounting column;

[0010] and a reinforcement layer, which is composed of sand and gravel and is filled between the outer plate and the inner plate; wherein the reinforcement mechanism includes a positioning component, which is fixedly mounted on the second mounting column by bolts, the positioning component is detachably connected to a reinforcing steel column, fixing components are arranged at both ends of the reinforcing steel column, and a reinforcement component is arranged on the outer wall of the reinforcing steel column.

[0011] Preferably, the thickness of the middle portion of the inner plate is smaller than the thickness of the two sides of the inner plate, and a mounting opening is provided on the outer wall of the second mounting column.

[0012] Preferably, the positioning assembly includes a mounting seat, which is detachably connected to the mounting port by bolts, and a support block is fixedly connected to the outer wall of the mounting seat. A slot is provided on the inner surface of the support block. Through the use of the support block, the reinforced steel column can be supported and positioned, thereby facilitating the installation of the reinforced steel column.

[0013] Preferably, the fixing component includes a groove, which is opened on the upper side of the reinforced steel column, a slider is slidably connected in the groove, an elastic telescopic rod is embedded in the slider, the slider and the groove are elastically connected by an extrusion spring, a clamping block is fixedly connected to the side of the slider away from the extrusion spring, the clamping block is clamped in the groove, and a pulling handle is fixedly connected to the telescopic end of the elastic telescopic rod, and the slider is pulled to slide in the groove by holding the pulling handle, so that the clamping block can be disengaged from the slot, thereby facilitating the subsequent removal of the reinforced steel column.

[0014] Preferably, a limiting rod is fixedly connected to the outer wall of the reinforced steel column, and two groups of limiting rods are provided, and the distance between the two groups of limiting rods is smaller than the length of the pulling handle. By using the limiting rod, the pulling handle can be limited, so that when the staff removes the reinforced steel column, after the blocking block is out of the slot and the pulling handle passes through the limiting rod, the pulling handle can be gradually relaxed, and the telescopic end of the elastic telescopic rod can be reset, so that the limiting rod can clamp the pulling handle to prevent the slider from resetting under the action of the extrusion spring.

[0015] Preferably, the reinforcement assembly includes a connecting rod, which is hinged on the outer wall of the reinforced steel column, and the end of the connecting rod away from the reinforced steel column is hinged to an auxiliary support plate, and an elastic telescopic part is provided on the auxiliary support plate, and the end of the elastic telescopic part away from the auxiliary support plate is fixedly connected to a block, the outer wall of the block is hinged with a hinged rod, and a sliding groove is provided on the outer wall of the hinged rod, and a round rod is slidably connected in the sliding groove, the round rod is fixedly connected to the outer wall of the support rod, and the support rod is fixedly connected to the outer wall of the auxiliary support plate, and the end of the hinged rod away from the block is hinged to a pressure block.

[0016] Preferably, a recess is formed on a side of the auxiliary support plate away from the connecting rod, and a movable plate is slidably connected in the recess.

[0017] Preferably, the movable plate is fixedly connected with an inner rod on one side close to the connecting rod, and a sleeve rod is sleeved on the outer wall of the inner rod, and the sleeve rod is fixedly connected to the outer wall of the auxiliary support plate, and a slip ring is fixedly connected on the outer wall of the inner rod, and the slip ring is slidably connected to the inner wall of the sleeve rod, and a pressure sensor is fixedly connected to the inner wall of the sleeve rod, and the slip ring and the pressure sensor are elastically connected via a connecting spring. When deformation occurs in the middle of the inner plate, the movable plate slides in the recess, so that the inner rod drives the slip ring to move, compressing the connecting spring, and the pressure reading sensed by the pressure sensor changes, thereby alerting the staff that the inner plate has begun to deform and the pressure it is subjected to exceeds the bearing range of the inner plate, thereby reminding the staff to stay away from the cofferdam and reinforce the cofferdam, and during the movement of the inner rod, the hinged rod moves, the round rod slides in the slide groove, so that the pressure block abuts against the inner plate, exerts a supporting force on the inner plate, thereby achieving the effect of reinforcing the inner plate.

[0018] Preferably, a grouting channel is provided in the middle of the mounting column, an inner groove, a through opening and a limiting groove are provided inside the pile column, the inner groove is connected with the grouting channel, the through opening is connected with the inner groove, a ring is slidably connected in the inner groove, a block is fixedly connected at the bottom of the ring, the block is slidably connected in the limiting groove, the ring and the inner groove are elastically connected by a supporting spring, mud is injected through the grouting channel, the mud squeezes the ring, the ring compresses the supporting spring, so that the ring drives the block to move downward to break away from the obstruction of the through opening, and the mud enters into the gap between the pile column and the riverbed soil through the through opening, thereby reinforcing the pile column.

[0019] The present invention provides a construction method of a cofferdam structure, comprising the following steps:

[0020] S1. First, insert the installation column 1, the installation column 2 and the pile column into the riverbed by a crane. After the installation column 1, the installation column 2 and the pile column are fixed and stabilized, insert the outer plate and the inner plate into the side grooves of the installation column 1 and the installation column 2;

[0021] S2, then fill the reinforcement layer between the outer plate and the inner plate. After the reinforcement layer is filled, the mounting seat is detachably connected to the mounting opening by bolts, and then the reinforcing steel column is installed in the mounting seat to reinforce the support of the inner plate;

[0022] S3, then hinge the connecting rod to the outer wall of the reinforced steel column, then fix the auxiliary support plate to the middle of the inner plate with bolts, and then pump out the water in the cofferdam;

[0023] S4, inserting the grouting pipe into the bottom of the riverbed, and then grouting the grouting pipe to form a sealing base;

[0024] S5. Then, inject mud through the grouting channel. The mud squeezes the ring, and the ring compresses the support spring, so that the ring drives the block to move downward to break away from the obstruction of the opening. The mud enters the gap between the pile column and the riverbed soil through the opening to reinforce the pile column.

[0025] The present invention provides a cofferdam structure and a construction method thereof, which have the following beneficial effects:

[0026] (1) Through the use of cofferdam mechanism, piles, grouting pipes and sealing base, the installation column 1, the installation column 2 and the pile can be stably inserted into the lathe, and the outer plate and the inner plate can be stably inserted into the side grooves of the installation column 1 and the installation column 2. Then, by filling the reinforcement layer, the stability of the outer plate is effectively guaranteed and the sealing of the outer plate is improved. At the same time, the sealing base generated by grouting with the grouting pipe can further improve the sealing of the cofferdam, prevent the gradual accumulation of water in the cofferdam structure, and ensure the stable construction of the project in the cofferdam structure.

[0027] (2) By using the reinforcement mechanism, the inner plate can be reinforced to improve the strength of the cofferdam structure. Moreover, when installing the reinforced steel column, the reinforced steel column can be directly installed in the mounting seat, which is very convenient to install. It is also relatively easy to remove the reinforced steel column later, thereby reducing the work intensity.

[0028] (3) By using the reinforcement component, when the middle part of the inner plate is deformed, the movable plate slides in the notch, so that the inner rod drives the slip ring to move, compresses the connecting spring, and the pressure reading sensed by the pressure sensor changes, thereby alerting the staff that the inner plate has begun to deform and the pressure it is subjected to exceeds the bearing range of the inner plate, thereby reminding the staff to stay away from the cofferdam and reinforce the cofferdam. In addition, during the movement of the inner rod, the hinged rod moves, the round rod slides in the slide groove, and the pressure block abuts against the inner plate, exerting a supporting force on the inner plate, thereby achieving the effect of reinforcing the inner plate.

[0029] (4) By injecting mud into the grouting channel, the mud squeezes the ring, and the ring compresses the support spring, so that the ring drives the block to move downward to break away from the obstruction of the opening. The mud enters the gap between the pile column and the riverbed soil through the opening, reinforcing the pile column and further improving the strength of the cofferdam structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the overall three-dimensional structure of Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the reinforcement mechanism structure of Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a positioning component according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic cross-sectional structure diagram of a fixing assembly and a reinforced steel column according to an embodiment of the present invention;

[0035] Figure 5 For the present invention Figure 2 Schematic diagram of the structure of A;

[0036] Figure 6 This is a schematic diagram of the structure of the second installation column and the pile column according to the first embodiment of the present invention;

[0037] Figure 7 This is a schematic cross-sectional structural diagram of a reinforcement assembly according to a second embodiment of the present invention;

[0038] Figure 8 For the present invention Figure 7 Schematic diagram of the structure of middle B;

[0039] Fig. 9 This is a schematic diagram of the cross-sectional structure of the installation column 1 and the pile column according to the third embodiment of the present invention;

[0040] Fig.10 For the present invention Fig. 9 Schematic diagram of the C structure.

[0041] In the figure: 1, cofferdam mechanism; 2, pile column; 3, reinforcement mechanism; 4, grouting pipe; 5, sealing base; 101, installation column one; 102, installation column two; 103, outer plate; 104, inner plate; 105, reinforcement layer; 1011, grouting channel; 1021, installation opening; 21, inner groove; 22, through opening; 23, limit groove; 24, ring; 25, stopper; 31, positioning assembly; 32, strengthening steel column; 33, fixing assembly; 34, reinforcement assembly; 311, mounting seat; 312, support block; 3 13. Slot; 321. Limit rod; 331. Groove; 332. Slider; 333. Block; 334. Elastic telescopic rod; 335. Pull handle; 341. Connecting rod; 342. Auxiliary support plate; 343. Elastic telescopic member; 344. Block; 345. Articulated rod; 346. Slide groove; 347. Round rod; 348. Support rod; 349. Press block; 3421. Notch; 3422. Moving plate; 3431. Sleeve rod; 3432. Inner rod; 3433. Slip ring; 3434. Pressure sensor.

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figure 1-Figure 6 The present invention proposes a cofferdam structure, including a cofferdam mechanism 1 and a pile 2. A reinforcement mechanism 3 is arranged on the cofferdam mechanism 1. A grouting pipe 4 is arranged below the reinforcement mechanism 3. The grouting pipe 4 is used for mud grouting to generate a sealing base 5.

[0045] In the embodiment of the present invention, in order to realize the assembly of the cofferdam mechanism 1, specifically, the cofferdam mechanism 1 includes a mounting column 101, a mounting column 102 and a reinforcement layer 105, the mounting column 101 is fixedly connected to the top of the pile column 2, the mounting column 102 and the side groove on the side wall of the mounting column 101 are slidably connected with an outer plate 103 and an inner plate 104, the reinforcement layer 105 is composed of sand and gravel, and the reinforcement layer 105 is filled between the outer plate 103 and the inner plate 104. 01. The second installation column 102 and the pile column 2 are inserted into the riverbed. After the first installation column 101, the second installation column 102 and the pile column 2 are fixed and stabilized, the outer plate 103 and the inner plate 104 are inserted into the side grooves of the first installation column 101 and the second installation column 102, and then the reinforcement layer 105 is filled between the outer plate 103 and the inner plate 104 to realize the assembly of the cofferdam mechanism 1. After the water in the cofferdam is pumped out, the grouting pipe 4 is inserted into the bottom of the riverbed, and then the grouting pipe 4 is grouted to generate a sealing base 5.

[0046] Further, in order to reinforce the cofferdam mechanism 1, specifically, the reinforcement mechanism 3 includes a positioning component 31, the positioning component 31 is fixedly installed on the second mounting column 102 by bolts, the positioning component 31 is detachably connected to the reinforcing steel column 32, the two ends of the reinforcing steel column 32 are provided with fixing components 33, and the outer wall of the reinforcing steel column 32 is provided with a reinforcing component 34, the positioning component 31 includes a mounting seat 311, and the outer wall of the second mounting column 102 is provided with a mounting opening 1021, and the mounting seat 311 is detachably connected to the mounting opening by bolts. In 1021, a support block 312 is fixedly connected to the outer wall of the mounting seat 311, a card slot 313 is provided on the inner surface of the support block 312, and a fixing component 33 includes a groove 331, the groove 331 is provided on the upper side of the reinforcing steel column 32, a slider 332 is slidably connected in the groove 331, an elastic telescopic rod 334 is embedded in the slider 332, the slider 332 is elastically connected to the groove 331 through an extrusion spring, a card block 333 is fixedly connected to the side of the slider 332 away from the extrusion spring, and the card block 333 is carded with the card slot 313 The telescopic end of the elastic telescopic rod 334 is fixedly connected with a pulling handle 335, and the outer wall of the reinforcing steel column 32 is fixedly connected with a limiting rod 321. Two groups of limiting rods 321 are provided, and the distance between the two groups of limiting rods 321 is less than the length of the pulling handle 335. After the mounting seat 311 is installed in the mounting opening 1021, the reinforcing steel column 32 is installed on the supporting block 312. In this process, the block 333 compresses the extrusion spring, and then after the block 333 is aligned with the card slot 313, under the reset action of the extrusion spring, the block 33 3 is inserted into the card slot 313 to fix the reinforcing steel column 32. At the same time, when the staff removes the reinforcing steel column 32, by holding the pulling handle 335, the slider 332 is pulled to slide in the groove 331, so that the card block 333 is separated from the card slot 313. After the pulling handle 335 passes the limiting rod 321, the pulling handle 335 is gradually relaxed, and the telescopic end of the elastic telescopic rod 334 is reset, so that the limiting rod 321 is clamped on the pulling handle 335, preventing the slider 332 from resetting under the action of the extrusion spring, so that the reinforcing steel column 32 can be conveniently and stably removed.

[0047] Further, in order to reinforce the inner plate 104, specifically, the reinforcement assembly 34 includes a connecting rod 341, the connecting rod 341 is hinged on the outer wall of the reinforcing steel column 32, the end of the connecting rod 341 away from the reinforcing steel column 32 is hinged to an auxiliary support plate 342, the auxiliary support plate 342 is provided with an elastic telescopic member 343, the end of the elastic telescopic member 343 away from the auxiliary support plate 342 is fixedly connected to a block 344, the outer wall of the block 344 is hinged to a hinge rod 345, A slide groove 346 is provided on the outer wall of the rod 345, and a round rod 347 is slidably connected in the slide groove 346. The round rod 347 is fixedly connected to the outer wall of the support rod 348, and the support rod 348 is fixedly connected to the outer wall of the auxiliary support plate 342. A pressure block 349 is hinged at the end of the hinged rod 345 away from the block 344. The auxiliary support plate 342 is fixed to the middle part of the inner plate 104 by bolts. Under the action of the connecting rod 341, the auxiliary support plate 342 can reinforce the inner plate 104.

[0048] Example 2: Please refer to Figure 7-Figure 8 On the basis of the first embodiment, the elastic telescopic member 343 is composed of an inner rod 3432, a sleeve rod 3431, a slip ring 3433 and a connecting spring. Specifically, the inner rod 3432 is fixedly connected to the side of the movable plate 3422 close to the connecting rod 341, the sleeve rod 3431 is sleeved on the outer wall of the inner rod 3432, the sleeve rod 3431 is fixedly connected to the outer wall of the auxiliary support plate 342, the slip ring 3433 is fixedly connected to the outer wall of the inner rod 3432, the slip ring 3433 is slidably connected to the inner wall of the sleeve rod 3431, the inner wall of the sleeve rod 3431 is fixedly connected to a pressure sensor 3434, the slip ring 3433 and the pressure sensor 3434 are elastically connected through a connecting spring, and a notch 3421 is provided on the side of the auxiliary support plate 342 away from the connecting rod 341, and the notch 342 1 is slidably connected with a movable plate 3422, and the middle thickness of the inner plate 104 is smaller than the thickness of the two sides of the inner plate 104. When the middle part of the inner plate 104 is deformed, the movable plate 3422 slides in the recess 3421, so that the inner rod 3432 drives the slip ring 3433 to move, compresses the connecting spring, and the pressure reading of the pressure sensor 3434 changes, thereby alerting the staff that the inner plate 104 has begun to deform and the pressure it is subjected to exceeds the bearing range of the inner plate 104, thereby reminding the staff to stay away from the cofferdam and reinforce the cofferdam. In addition, during the movement of the inner rod 3432, the hinged rod 345 moves, the round rod 347 slides in the slide groove 346, and the pressure block 349 abuts against the inner plate 104, exerting a supporting force on the inner plate 104, thereby achieving the effect of reinforcing the inner plate 104.

[0049] Example 3: Please refer to Figure 9-10On the basis of the first embodiment, a grouting channel 1011 is provided in the middle of the installation column 101, and an inner groove 21, a through-port 22 and a limiting groove 23 are provided inside the pile column 2. The inner groove 21 is connected with the grouting channel 1011, and the through-port 22 is connected with the inner groove 21. A ring 24 is slidably connected in the inner groove 21, and a stopper 25 is fixedly connected at the bottom of the ring 24. The stopper 25 is slidably connected in the limiting groove 23. The ring 24 and the inner groove 21 are elastically connected by a supporting spring. By injecting mud into the grouting channel 1011, the mud squeezes the ring 24, and the ring 24 compresses the supporting spring, so that the ring 24 drives the stopper 25 to move downward to break away from the obstruction of the through-port 22. The mud enters the gap between the pile column 2 and the riverbed soil through the through-port 22, thereby reinforcing the pile column 2 and further improving the strength of the cofferdam structure.

[0050] It should be noted that the above-mentioned electrical components are all existing technology products. Technical personnel in this field select, install and complete the circuit debugging work according to the needs of use to ensure that all electrical appliances can work normally. The components are all universal standard parts or components known to technical personnel in this field. Their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods. The applicant does not make specific restrictions here.

[0051] The present invention also provides a construction method of a cofferdam structure, comprising the following steps:

[0052] S1. First, insert the installation column 101, the installation column 102 and the pile column 2 into the riverbed by a crane. After the installation column 101, the installation column 102 and the pile column 2 are fixed and stabilized, insert the outer plate 103 and the inner plate 104 into the side grooves of the installation column 101 and the installation column 2 102;

[0053] S2, fill the reinforcement layer 105 between the outer plate 103 and the inner plate 104. After the reinforcement layer 105 is filled, the mounting seat 311 is detachably connected to the mounting opening 1021 by bolts, and then the reinforcing steel column 32 is installed in the mounting seat 311 to reinforce and support the inner plate 104;

[0054] S3, hinge the connecting rod 341 to the outer wall of the reinforcing steel column 32, and then fix the auxiliary support plate 342 to the middle part of the inner plate 104 by bolts, and then pump out the water in the cofferdam;

[0055] S4, inserting the grouting pipe 4 into the bottom of the riverbed, and then grouting the grouting pipe 4 to form a sealing base 5;

[0056] S5. Then, slurry is injected through the grouting channel 1011. The slurry squeezes the ring 24. The ring 24 compresses the support spring, so that the ring 24 drives the block 25 to move downward and escape from the obstruction of the opening 22. The slurry enters the gap between the pile column 2 and the riverbed soil through the opening 22 to reinforce the pile column 2.

[0057] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cofferdam structure, comprising a cofferdam mechanism (1) and a pile (2), characterized in that: The cofferdam mechanism (1) is provided with a reinforcement mechanism (3), a grouting pipe (4) is provided below the reinforcement mechanism (3), and the grouting pipe (4) is used for grouting mud to generate a sealing base (5). The cofferdam mechanism (1) comprises: A mounting column (101), wherein the mounting column (101) is fixedly connected to the top of the pile column (2); A second mounting column (102), wherein an outer plate (103) and an inner plate (104) are slidably connected in side grooves on the side walls of the second mounting column (102) and the first mounting column (101); A reinforcement layer (105), the reinforcement layer (105) is composed of sand and gravel, and the reinforcement layer (105) is filled between the outer plate (103) and the inner plate (104); wherein the reinforcement mechanism (3) includes a positioning component (31), the positioning component (31) is fixedly mounted on the second mounting column (102) by bolts, the positioning component (31) is detachably connected to a reinforcing steel column (32), fixing components (33) are arranged at both ends of the reinforcing steel column (32), and a reinforcement component (34) is arranged on the outer wall of the reinforcing steel column (32).

2. The cofferdam structure according to claim 1, characterized in that: The thickness of the middle portion of the inner plate (104) is smaller than the thickness of the two sides of the inner plate (104), and a mounting opening (1021) is provided on the outer wall of the second mounting column (102).

3. The cofferdam structure according to claim 2, characterized in that: The positioning assembly (31) comprises a mounting seat (311), the mounting seat (311) being detachably connected to the mounting opening (1021) by means of bolts, a support block (312) being fixedly connected to the outer wall of the mounting seat (311), and a clamping groove (313) being provided on the inner surface of the support block (312).

4. The cofferdam structure according to claim 3, characterized in that: The fixing assembly (33) comprises a groove (331), wherein the groove (331) is provided on the upper side of the reinforcing steel column (32), a slider (332) is slidably connected in the groove (331), an elastic telescopic rod (334) is embedded and installed in the slider (332), the slider (332) and the groove (331) are elastically connected via a compression spring, a clamping block (333) is fixedly connected to the side of the slider (332) away from the compression spring, the clamping block (333) is clamped with the clamping slot (313), and a pulling handle (335) is fixedly connected to the telescopic end of the elastic telescopic rod (334).

5. The cofferdam structure according to claim 4, characterized in that: The outer wall of the reinforcing steel column (32) is fixedly connected to a limiting rod (321), and two groups of the limiting rods (321) are provided, and the distance between the two groups of the limiting rods (321) is smaller than the length of the pulling handle (335).

6. The cofferdam structure according to claim 1, characterized in that: The reinforcement assembly (34) comprises a connecting rod (341), wherein the connecting rod (341) is hinged on the outer wall of the reinforcing steel column (32), and an end of the connecting rod (341) away from the reinforcing steel column (32) is hinged to an auxiliary support plate (342), and an elastic telescopic member (343) is provided on the auxiliary support plate (342), and an end of the elastic telescopic member (343) away from the auxiliary support plate (342) is fixedly connected to a block (344), and the block (344) is fixedly connected to the auxiliary support plate (342). The outer wall of the block (344) is hinged with a hinge rod (345), a slide groove (346) is provided on the outer wall of the hinge rod (345), a round rod (347) is slidably connected in the slide groove (346), the round rod (347) is fixedly connected to the outer wall of the support rod (348), the support rod (348) is fixedly connected to the outer wall of the auxiliary support plate (342), and the end of the hinge rod (345) away from the block (344) is hinged with a pressure block (349).

7. The cofferdam structure according to claim 6, characterized in that: A notch (3421) is provided on a side of the auxiliary support plate (342) away from the connecting rod (341), and a movable plate (3422) is slidably connected in the notch (3421).

8. The cofferdam structure according to claim 7, characterized in that: The movable plate (3422) is fixedly connected to an inner rod (3432) on one side close to the connecting rod (341); a sleeve rod (3431) is sleeved on the outer wall of the inner rod (3432); the sleeve rod (3431) is fixedly connected to the outer wall of the auxiliary support plate (342); a slip ring (3433) is fixedly connected to the outer wall of the inner rod (3432); the slip ring (3433) is slidably connected to the inner wall of the sleeve rod (3431); a pressure sensor (3434) is fixedly connected to the inner wall of the sleeve rod (3431); the slip ring (3433) and the pressure sensor (3434) are elastically connected via a connecting spring.

9. The cofferdam structure according to claim 1, characterized in that: A grouting channel (1011) is provided in the middle of the installation column (101), and an inner groove (21), a through hole (22) and a limit groove (23) are provided inside the pile column (2); the inner groove (21) is connected to the grouting channel (1011), and the through hole (22) is connected to the inner groove (21); a circular ring (24) is slidably connected in the inner groove (21), a stopper (25) is fixedly connected to the bottom of the circular ring (24), and the stopper (25) is slidably connected in the limit groove (23); the circular ring (24) and the inner groove (21) are elastically connected via a supporting spring.

10. A construction method for a cofferdam structure according to claims 1 to 9, characterized in that: The following steps are involved: S1. First, the installation column 1 (101), the installation column 2 (102) and the pile column (2) are inserted into the riverbed by a crane. After the installation column 1 (101), the installation column 2 (102) and the pile column (2) are fixed and stabilized, the outer plate (103) and the inner plate (104) are inserted into the side grooves of the installation column 1 (101) and the installation column 2 (102); S2, filling the reinforcement layer (105) between the outer plate (103) and the inner plate (104), after the reinforcement layer (105) is filled, the mounting seat (311) is detachably connected to the mounting opening (1021) by bolts, and then the reinforcing steel column (32) is installed in the mounting seat (311) to reinforce and support the inner plate (104); S3, hinge the connecting rod (341) to the outer wall of the reinforcing steel column (32), fix the auxiliary support plate (342) to the middle part of the inner plate (104) by bolts, and then pump out the water in the cofferdam; S4, inserting the grouting pipe (4) into the bottom of the riverbed, and then grouting the grouting pipe (4) to form a sealing base (5); S5. Then, slurry is injected through the grouting channel (1011). The slurry squeezes the annular ring (24). The annular ring (24) compresses the supporting spring, so that the annular ring (24) drives the block (25) to move downward and escape from the obstruction of the opening (22). The slurry enters the gap between the pile column (2) and the riverbed soil through the opening (22), thereby reinforcing the pile column (2).

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