Underwater pouring butt joint structure of prefabricated beam column

Abstract

The utility model provides an underwater pouring butt joint structure of a prefabricated beam column, which belongs to the technical field of constructional engineering and structurally comprises an underwater cross beam and a vertical column. A water-stopping hoop supporting seat is fixed on the column body of the top section of the stand column, and a water-stopping hoop is sleeved on the periphery of the column body of the top section of the stand column above the water-stopping hoop supporting seat; vertical column upper end exposed steel bars extend from the top ends of the vertical columns; a mortise cavity with a downward opening is formed in the cross beam, the top face of the mortise cavity is arranged to be a blind end, and an exhaust and drainage hole and a grouting hole are formed between the blind end and the top face of the cross beam. A top end opening of the exhaust drainage hole is communicated with a drainage exhaust pipe in a sealed mode, the drainage exhaust pipe extends upwards, and a water pumping and exhaust pump is arranged on the exhaust exhaust pipe. A water stopping support used for underwater self-sealing between the cross beam and the stand column is arranged between the water stopping hoops of the cross beam and the stand column. Rapid and bubble-free grouting is guaranteed, divers do not need to enter water for multiple times, the construction difficulty is reduced, the construction risk is reduced, the construction cost is saved, and grout leakage and pollution are avoided.

Description

Technical Field

[0001] This utility model relates to the field of underwater operation technology for precast concrete components in building engineering, specifically to an underwater casting and docking structure for precast beams and columns. Background Technology

[0002] Generally, the deep underwater butt joint installation of precast concrete beams is widely used in the assembly of deep underwater engineering structures such as river and lake shore wharves, slipways, offshore oil and gas extraction, and subsea oil pipelines. Traditional installation processes require engineers with diving qualifications to work underwater for extended periods, making the entire construction process and underwater procedures extremely difficult to implement, and ensuring installation accuracy and construction quality is challenging. Furthermore, sealing the mortise cavity after the upper end of the underwater steel sleeve column is inserted into the beam is extremely difficult. After the grout is poured into the pre-reserved mortise cavity of the concrete beam, seawater intrusion dilutes and alters the grout mix ratio, reducing the bonding strength of the beam-column joint, resulting in poor fixing and inconsistent joint quality. Simultaneously, the installation of concrete components in the deep seawater environment is risky, difficult, costly, and carries potential pollution risks.

[0003] A Chinese patent (CN114908758) describes a method for underwater concrete pouring of cast-in-place piles. This method requires constructing a reinforcing cage underwater, which, along with a sleeve, forms a sealed space. However, the method involves pouring concrete in stages and repeatedly raising and lowering the sleeve, making it difficult to completely seal the underwater space. This necessitates multiple dives by operators. Furthermore, the repeated raising, fixing, and sealing of the sleeve is not only cumbersome and prolongs the construction period, but it is also only suitable for operations in still water. The repeated raising and lowering of the sleeve is extremely difficult, and the sealing effect is generally poor.

[0004] Another method for underwater concrete pouring, disclosed in Chinese Publication No. CN110241827, divides underwater concrete pouring into five steps: constructing a cofferdam, laying protective pipes, placing rocks, draining water, and pouring concrete. This method can be used for underwater concrete pouring, but it is only suitable for projects in shallow waters and smaller areas. When installing prefabricated components or pouring concrete underwater at depths of 5 meters or more, this method will no longer be applicable, as earth-rock cofferdams cannot be constructed in the deep sea.

[0005] Existing patents: These methods are only applicable to shallow, still water and have drawbacks such as too many underwater operation steps, long duration, and high construction difficulty. When the entire construction process is carried out underwater, there is a risk that the underwater construction method may fail or the construction quality may not be guaranteed. Summary of the Invention

[0006] The technical task of this utility model is to overcome the shortcomings of the existing technology and provide an underwater casting and docking structure for precast beams and columns, specifically a fully sealed and rapid grouting device for the underwater docking of precast concrete beams with steel sleeve columns.

[0007] The technical solution of this utility model is implemented in the following way: the underwater casting and docking structure of precast beams and columns of this utility model includes underwater crossbeams and columns.

[0008] The top section of the column is fixed with a water-stop clamp support.

[0009] A water-stop clamp is fitted around the outer perimeter of the column top section above the water-stop clamp support base;

[0010] The top of the column extends with exposed steel bars at the top end of the column;

[0011] The crossbeam has a mortise cavity with the opening facing downwards. The mortise cavity corresponds to the top of the column. The top surface of the mortise cavity is set as a blind end. A ventilation and drainage hole and a grouting hole are opened from the blind end to the top surface of the crossbeam.

[0012] The top end of the vent and drain hole is sealed and connected to the vent and drain pipe, which extends upward and is equipped with a water pump and vent pump.

[0013] The top end of the grouting hole is sealed and connected to the grouting pipe, which extends upward. A grouting pump is installed on the grouting pipe, and a grout storage tank equipped with a concrete injection funnel is connected to the grouting pump.

[0014] The mortise cavity, drainage and venting pipes, and grouting pipes constitute the post-casting system for underwater connection between the beams and columns;

[0015] A water-stop bracket is installed between the water-stop clamps of the beams and columns to provide underwater self-sealing between them.

[0016] Lifting rings are installed on the crossbeam. At each lifting point, the lifting ring and the lifting ring seat are fixedly connected as one unit. Bolt holes are opened on the lifting ring seat. Pre-embedded bolts are installed in the crossbeam. The pre-embedded bolts extend out of the crossbeam and are fixedly connected to the lifting ring seat by nuts.

[0017] Deeply embedded steel bars are also pre-embedded in the main body of the crossbeam between two adjacent lifting points, and the deeply embedded steel bars are connected to the pre-embedded bolts between the two adjacent lifting points.

[0018] Deeply embedded steel bars within the main body of the beam span or penetrate the mortise cavity.

[0019] Along the span of the beam, the mortise cavities correspond one-to-one with the columns;

[0020] The crossbeams are made of concrete, and the columns are made of steel sleeve columns.

[0021] The water-stop clamp is a cylindrical water-stop clamp formed by two semi-circular tiles coming together to form a complete circle.

[0022] Bolt clamping holes are provided on the vertical fastening wing plates at both ends of each tile. The two mating fastening wing plates are fastened together by bolts passing through the bolt clamping holes.

[0023] A horizontal wing plate is fixedly connected to the surface of the vertical fastening wing plate;

[0024] The water-stop clamp has a horizontally extending water-stop support at its top.

[0025] A circular annular water-stop washer is provided on the water-stop support. The lower ring surface of the annular water-stop washer is tightly attached to the upper surface of the water-stop support, and the upper ring surface of the water-stop washer is tightly attached to the outer edge of the lower opening of the mortise cavity at the bottom of the crossbeam.

[0026] The outer periphery of the annular water-stop gasket is set as a thickened linear edge sealing ring with a circular cross-section, and the edge sealing ring is continuous with the body of the annular water-stop gasket.

[0027] The annular water-stop gasket is made of high-molecular elastomer.

[0028] The water-stop clamp support is constructed by welding a steel ring support and a triangular steel support.

[0029] The ring plane of the steel ring support is located on the radial plane of the column.

[0030] The steel ring support is on top, and the triangular steel support is on the bottom.

[0031] Each triangular steel support is set vertically, and the bottom surface of the steel ring support is fixedly connected to the column steel bar;

[0032] The precast water-stop clamp support is fixedly connected to the top section of the column body;

[0033] The upper ring surface of the steel ring support of the water-stop clamp support seat is used for the placement and support of the water-stop clamp and / or crossbeam.

[0034] The crossbeams are made of precast concrete.

[0035] The columns are made of precast concrete.

[0036] The beneficial effects of this utility model compared with the prior art are:

[0037] This utility model discloses an underwater casting and docking structure for precast beams and columns, which is a process structure for docking, installing, sealing, and fixing precast concrete beams to column heads in deep seawater.

[0038] The underwater beam-column joint sealing and high-efficiency grouting device has the following advantages: After the concrete beam is placed in place, the water-stop steel clamps installed on the underwater steel sleeve column have a self-sealing effect, and the deeper the water, the better the sealing effect. This achieves complete sealing and efficient drainage and venting within the grouting cavity, ensuring the quality of the grout injected into the mortise cavity of the concrete beam. Grouting is performed using a grouting pump through the grouting pipe, and drainage and venting are performed using a water pump and an venting pump through the venting pipe, ensuring rapid and air-free grouting. After the crossbeam is installed in place, only the grouting pump and the drainage and venting pump, which are also located above water, need to be operated. This eliminates the need for divers to go underwater multiple times, reducing construction difficulty, lowering construction risks, saving construction costs, and avoiding grout leakage and pollution.

[0039] Before connecting the crossbeams, the anti-slip steel clamps are first positioned, installed on the upper section of the underwater column, and tightened onto the steel sleeve of the column. The top surface of the clamp has a circular steel plate as a water-stop support, and the circular water-stop washer is directly fastened to the circular steel plate. The rubber ring of the circular water-stop washer is directly attached to the water-stop support steel plate. The outer edge of the circular water-stop washer is a spherical sealing ring. After the crossbeam is placed and positioned, under the weight of the upper crossbeam, the outer spherical sealing ring is flattened and expands into an outer ring. The expanded outer ring is tightly attached to both the bottom of the crossbeam and the outer edge of the water-stop support steel plate, forming a tight seal between the two. Under the pressure of deep underwater water, the expanded outer ring tightly attached to the bottom of the crossbeam: the deeper the water, the greater the water pressure on the outer ring, the tighter its contact with the bottom surface of the crossbeam, and the better the sealing effect. This prevents seawater from entering the pre-reserved mortise cavity at the end of the beam, ensuring that the grout injected into the mortise cavity is not diluted, thus improving the bonding quality between the beam and the column head and resulting in better fixation. Similarly, the deeper the water, the stronger the seal between the outer ring and the outer edge of the water-stop support plate.

[0040] Two small-diameter vertical holes are pre-drilled on the concrete beam: one for grouting and the other for drainage and venting. Before grouting, seawater is extracted from the vent and air is released. After drainage and venting are completed, grout with the optimal mix ratio is injected through the grouting pipe into the pre-drilled mortise cavity using a grouting pump. After the grout solidifies, the concrete in the beam mortise cavity and the column head at the top of the column bond together to form a unified whole.

[0041] Compared to other methods, this invention avoids deep, high-pressure underwater entry into the mortise cavity, ensuring the grout is not diluted and guaranteeing the bonding quality between the beam and the column head. It also features simple construction, high safety, better sealing with higher water pressure, easy installation, and low cost. This technology has significant implications and widespread application value for the assembly of large underwater concrete components.

[0042] This invention relates to the installation of precast concrete beams and the grouting of the joint cavity. It is suitable for deep underwater operations, especially for large beam components. After being poured on the ground, the beams are lifted and fixed to the underwater column head in one go, solving the problem of underwater installation of large precast concrete components. It also proposes a self-sealing outer spherical water-stop ring washer that relies on water pressure, ensuring both the sealing effect of the tenon cavity and the quality of the grouting.

[0043] The underwater casting and docking structure for precast beams and columns of this utility model is reasonably designed, simple in structure, safe and reliable, easy to use and easy to maintain, and has great value for promotion and application. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0045] Figure 2 This is a schematic diagram of the longitudinal section of a concrete beam.

[0046] Figure 3 This is an exploded structural diagram of a beam-column joint of this utility model;

[0047] Figure 4 This is a schematic diagram of the structure of the water-stop clamp of this utility model;

[0048] Figure 5 This is a schematic diagram of the overall assembly structure of the water-stop clamp of this utility model;

[0049] Figure 6 This is a schematic diagram of the overall structure of the lifting ring's mounting section;

[0050] Figure 7 A schematic diagram showing the instantaneous contact between the bottom surface of the beam and the water-stop washer during beam installation;

[0051] Figure 8 A schematic diagram showing the thickened linear edge sealing ring of the stop gasket being completely squeezed and bulged out;

[0052] Figure 9 for Figure 8 A schematic diagram showing the thickened linear edge sealing ring of the water-stop gasket being fully compressed and tightly adhered to the bottom surface of the crossbeam.

[0053] The markings in the attached diagram represent:

[0054] 1. Crossbeam, 2. Grout storage tank, 3. Concrete filling funnel, 4. Grouting pipe, 5. Grouting pump, 6. Water pump and air pump, 7. Drainage and air vent pipe.

[0055] 8. Column, 9. Lifting ring, 10. Water-stop clamp, 11. Steel ring support, 12. Triangular steel support.

[0056] 13. Pre-embedded bolts; 14. Deeply embedded reinforcing bars.

[0057] 15. Mortise cavity; 16. Vent and drain hole; 17. Grouting hole; 18. Exposed reinforcing bar at the top end of the column.

[0058] 19. Water-stopping gasket; 20. Thickened linear edge sealing ring;

[0059] 21. Water-stopping self-sealing bulge,

[0060] 22. Bolt clamping hole; 23. Horizontal flange.

[0061] 24. Secure the wing plates.

[0062] 25. Waterstop bracket,

[0063] 26. Water-stop clamp support seat; 27. Column steel sleeve. Detailed Implementation

[0064] The following is a detailed description of an underwater casting and docking structure for precast beams and columns according to the present invention, with reference to the accompanying drawings.

[0065] As shown in the attached figure, the present invention relates to an underwater casting and docking structure for precast beams and columns. The structure mainly consists of three parts: a reserved concrete crossbeam 1, a tenon cavity 15, a water-stop clamp 10, and an underwater column 8.

[0066] During construction, the water-stop clamp 10 is first installed at the designed position on the upper end of the column. The water-stop clamp 10 consists of two semi-circular steel cylinders tightly wrapped around the column. The top of the water-stop clamp 10, composed of two semi-circular cylinders, is a circular steel plate water-stop support 25. A water-stop washer 19 is directly fastened onto the steel plate water-stop support 25. The thickened linear edge sealing ring 20 on the outer periphery of the water-stop washer 19 is fastened to the outer periphery of the water-stop support 25. The main reinforcing bars 18 of the pre-reserved upper end of the column are exposed and facing upwards.

[0067] The crossbeam is lifted using lifting rings. The upper reinforcing bars of the columns are inserted into the mortise cavities at both ends of the crossbeam for installation. During installation, care must be taken to ensure that the thickened linear edge sealing ring 20 of the water-stop washer 19 is tightly pressed against the bottom surface of the crossbeam. After pressing, the spherical water-stop washer expands by one ring and adheres to the bottom surface of the beam. Under water pressure, the expanded ring and the bottom surface of the beam are tightly bonded. Before the crossbeam is installed and grout is poured, the pre-reserved drainage and venting pipe above the mortise cavity 15 is connected to the hose of an external small water pump to remove the seawater from the cavity to be grouted. The pre-reserved grouting pipe above the mortise cavity 15 is connected to the hose of an external small high-pressure grouting pump, and high-strength grout is injected into the cavity. After the grout solidifies, the venting pipe and the concrete grouting pipe above the crossbeam can be removed, and the construction is complete.

[0068] Technical points:

[0069] (1) Tenon cavities are reserved at both ends of the concrete beam.

[0070] The mortise cavities reserved at both ends of the crossbeam are used for the embedding of the column heads of the steel sleeve columns in deep water. The size of the mortise cavity is determined by two parameters: the diameter and height of the inner cavity. Its diameter D matches the diameter d of the steel sleeve column and is slightly larger than the column diameter. The column diameter is determined by the diameter d1 of the concrete inside the sleeve and the thickness t of the steel sleeve wall, where d = d1 + 2t and D > d1 + 2t, to ensure that the upper end of the column is embedded in the cavity. At the same time, the height of the reserved mortise cavity should ensure that all exposed steel bars at the upper end of the column can enter the cavity. It should also meet the requirements of pressing the bottom surface of the concrete beam after hoisting and placement with the water-stopping gasket and the thickened linear edge sealing ring of the water-stopping rubber ring. The spherical ring on the outer edge of the annular water-stopping ring is squeezed by the bottom surface of the beam and the top surface of the clamp, and the spherical ring expands to form a water-stopping ring. The water-stopping ring withstands the water pressure and fits tightly against the bottom surface of the concrete beam, achieving a complete seal between the top surface of the clamp and the beam surface and a complete water stop. The mortise cavity has a good sealing effect.

[0071] The lifting operation of the crossbeam is prone to causing concrete cracks. To avoid the occurrence of concrete cracks, the inner cavity diameter is taken as 0.6W, where W is the width of the concrete beam; the inner cavity height is preferably 0.8H, where H is the height of the crossbeam.

[0072] (2) Circular water-stop washer and outer spherical crown water-stop ring

[0073] The annular water-stop washer and the outer spherical water-stop ring (i.e., the thickened linear edge sealing ring undergoes compressive deformation under underwater pressure and the pressure from the crossbeam and the water-stop support, transforming from the original circular cross-section thickened linear edge sealing ring into an outer spherical shape) are preferably made of high-molecular elastic material. The diameter of the ring formed by the centers of the outer spherical crown of the annular water-stop washer is the outer diameter of the annular steel plate of the upper water-stop support of the clamp. After the concrete beam is hoisted and placed in position, the annular water-stop washer fits tightly against the upper and lower rigid surfaces, providing a good sealing and water-stopping effect. The spherical head of the outer edge of the water-stop washer at the top of the steel clamp is squeezed by the bottom surface of the crossbeam, bulging outward and forming a water-stop ring that fits tightly against the bottom surface of the beam. Under seawater pressure, the fit is even tighter, resulting in a better water-stopping effect.

[0074] (3) Diameter of drainage and venting holes

[0075] Compared to the cross-sectional dimensions, the pre-reserved mortise cavity is relatively large, which weakens the strength and rigidity of the ends of the concrete beam to some extent. Since the amount of air and water to be removed from the mortise cavity is relatively small, a single vertical hole is chosen for both drainage and venting. This hole extends vertically downwards from the top of the concrete beam, passing through the top beam of the cavity and connecting to the cavity itself. A PVC pipe is pre-installed at the top of the drainage and vent hole, connected to a rubber hose. The rubber hose extends to sea level and connects to a water pump and air pump placed on the operating platform. A small air pump and water pump are used to remove air and water from the mortise cavity. The diameter of the drainage and vent hole is R1 = 0.02 × W, where W is the width of the crossbeam.

[0076] (4) Grouting hole

[0077] The pre-drilled grouting holes at the ends of the beams face vertically downwards and connect to the pre-drilled mortise cavities. PVC pipes are pre-embedded in the circular openings, connected to flexible hoses, and then to a grouting pump placed on the work platform. The grout is prepared from cement, coarse sand, fine aggregate, and epoxy resin in a specific ratio. To ensure the fine aggregates can smoothly pass through the holes into the mortise cavities at the ends of the concrete beams, the diameter of the grouting holes is slightly larger, with a diameter R2 = 0.06W, where W is the width of the beam. A small grouting pump is used, and the resistance to grout flow throughout the hose must be calculated. The grouting pressure must be greater than the resistance encountered by the grout during its flow through the pipe.

[0078] (5) Lifting

[0079] Based on the beam's self-weight and hoisting plan, eight lifting rings 9 are pre-installed at the designed positions on the beam body. The lifting rings 9 and the lower lifting ring seat steel plate are a single unit. The lower steel plate of the lifting rings is connected to the beam using four corner bolts. Pre-embedded bolts penetrate deep into the beam and are welded to the deeply embedded reinforcing bars of the main load-bearing reinforcement at the beam's end. Tightening the nuts of the four corner bolts secures the steel plate to the beam. The main load-bearing reinforcement inside the beam is firmly welded to the four corner bolts as a single unit. The grout storage tank 2 is connected to a small grouting pump 5, and grout is pumped into the mortise cavity 15 of the beam 1 through the grouting pipe 4. A water pump 6, connected to the mortise cavity of the beam 1 through a drainage and exhaust pipe 7, extracts seawater from the cavity and expels air from within. The water-stop clamp 10 tightly grips the steel sleeve column 8 and bears the weight of the upper concrete beam 1. The load-bearing part on the water-stop clamp 10 is transferred to the steel ring support part 11. The triangular steel support part 12 is welded to the outer wall of the column steel sleeve to support the steel ring support part 11.

[0080] Figure 1 In the process, the drainage (air) holes and pipe diameters on the cavities at both ends of the concrete beam need to be determined based on the drainage and air release volume and the actual grouting time; at the same time, a matching small water pump 6 (air pump) and a small grouting pump 5 should be selected.

[0081] Figure 2As shown, the lifting ring 9, embedded bolts 13, deeply embedded reinforcing bars 14 (main reinforcing bars of the beam), mortise cavities 15 reserved at the beam ends, venting and drainage holes 16, and grouting holes 17 are included. The length of the embedded bolts 13 at the lower end of the lifting ring 9 is 0.8H, where H is the height of the beam 1. During the pouring of the beam 1, the embedded bolts 13 and the deeply embedded reinforcing bars 14 are poured together inside the beam and welded together. In addition, the weight of the beam, the position of the lifting ring, and the load-bearing capacity of each hook are calculated during the lifting process to ensure the strength and rigidity of the lifting ring 9 and guarantee the safety and stability of the lifting process.

[0082] Figure 3 As shown, the structure includes a crossbeam 1, a water-stop clamp 10, a pre-reserved mortise cavity 15, exposed reinforcing bars 18 at the top end of the column, a water-stop washer 19, and a thickened linear edge sealing ring 20. A small grouting pump 5 draws grout from the grout storage tank 2 and injects it into the mortise cavity 15 via the grouting pipe 4 and grouting hole 17. The fine aggregate and epoxy resin mixture injected into the mortise cavity 15 bonds together with the exposed reinforcing bars 18 at the top end of the column. After the crossbeam 1 is in place, the bottom surface of the beam is pressed tightly against the outer edge of the spherical annular water-stop washer 19 on the top surface of the clamp, ensuring a tight seal. The water-stop clamp 10 supports the crossbeam 1. Under the pressure of the bottom surface of the crossbeam 1 and the top surface of the clamp 10, the thickened linear edge sealing ring 20 of the water-stop washer 19 tightly seals the two contact surfaces, preventing seawater from entering the mortise cavity 15 and ensuring the quality of the concrete pouring.

[0083] Figure 4 As shown, the thickened linear edge sealing ring 20 is the outer spherical ring of the water-stop washer. A circular outer spherical water-stop washer 19 is applied to the top surface of the water-stop clamp 10, ensuring tight contact and sealing between the top surface of the water-stop clamp 10 and the bottom surface of the beam 1. The outer spherical ring water-stop washer 19 is tightly pressed against the bottom surface of the concrete beam 1 and the top surface of the clamp 10. The thickened linear edge sealing ring 20 bulges out in a spherical shape, forming an bulging ring that adheres tightly to the bottom of the beam, adding another layer of water-stopping effect and improving the sealing performance.

[0084] Figure 5 As shown, there is a water-stop washer 19 and a thickened linear edge sealing ring 20. The fastening flange 24 is a vertical steel plate welded to the wall of the two semi-cylindrical clamps. The vertical steel plates are closely attached to each other and tightened with bolts to ensure that the two semi-cylindrical clamps are firmly fixed to the steel sleeve wall of the column. The bolt tightening holes 22 are evenly distributed. The horizontal flange 23 is made of steel plate and serves to support the concrete beam. The second and third horizontal flanges 23 on the side of the water-stop clamp barrel strengthen the clamp, increase the overall rigidity of the clamp, ensure the stability of the clamp, and reduce the deformation of the clamp.

[0085] Figure 6In the middle section, there are 9 lifting rings and 13 embedded bolts. The tensile force borne by each lifting ring needs to be calculated, as does the tensile and shear strength of the lifting rings. The steel plate requires shear calculation.

[0086] Figure 7 As shown, there is a water-stopping washer 19 and a thickened linear edge sealing ring 20. The outer edge of the water-stopping annular washer bulges outward under the combined pressure of the water-stopping support 25 and the bottom surface of the crossbeam 1.

[0087] Figure 8 As shown, the thickened linear edge sealing ring 20 is a ball-head water-stop ring bulging out of the outer edge of the water-stop gasket. The ball-head water-stop ring on the outer edge of the water-stop gasket bulges outward under the joint compression of the water-stop support 25 and the bottom surface of the crossbeam 1. The bulging part is a circular bulging ring, and the bulging ring is tightly attached to the bottom surface of the concrete crossbeam 1.

[0088] The thickened linear edge sealing ring on the outer periphery of the annular water-stop gasket undergoes compressive deformation under underwater pressure and the pressure from the crossbeam and water-stop support. This transforms the original (ball-head) circular cross-section thickened linear edge sealing ring into an outer spherical crown-shaped water-stop ring. That is, a ball-head compressive deformation spherical crown. This is the self-sealing water-stop bulge 21.

[0089] Figure 9 As shown, this is a schematic diagram of the fit between the annular outer spherical water-stop washer 19 and the bottom surface of the crossbeam at the tilt angle. After the concrete beam is placed in position, the water-stop washer 19, with its outer spherical head water-stop ring, expands out a bulge after being compressed, forming a bulge ring that fits tightly against the bottom surface of the beam. The bulge ring is pressed against the bottom surface of the crossbeam 1 by water pressure. The deeper the underwater location of the joint between the concrete crossbeam 1 and the steel sleeve column 8, the greater the water pressure borne by the bulge ring containing the self-sealing water-stop bulge 21. The tighter the fit between the bulge ring containing the self-sealing water-stop bulge 21 and the bottom surface of the crossbeam 1, the better the water-stopping effect.

Claims

1. An underwater casting and docking structure for precast beams and columns, characterized in that... Including underwater beams and columns; The top section of the column is fixed with a water-stop clamp support. A water-stop clamp is fitted around the outer perimeter of the column top section above the water-stop clamp support base; The top of the column extends with exposed steel bars at the top end of the column; The crossbeam has a mortise cavity with the opening facing downwards. The mortise cavity corresponds to the top of the column. The top surface of the mortise cavity is set as a blind end. A ventilation and drainage hole and a grouting hole are opened from the blind end to the top surface of the crossbeam. The top end of the vent and drain hole is sealed and connected to the vent and drain pipe, which extends upward and is equipped with a water pump and vent pump. The top end of the grouting hole is sealed and connected to the grouting pipe, which extends upward. A grouting pump is installed on the grouting pipe, and a grout storage tank equipped with a concrete injection funnel is connected to the grouting pump. The mortise cavity, drainage and venting pipes, and grouting pipes constitute the post-casting system for underwater connection between the beams and columns; A water-stop bracket is installed between the water-stop clamps of the beams and columns to provide underwater self-sealing between them.

2. The underwater casting and docking structure for precast beams and columns according to claim 1, characterized in that: Lifting rings are installed on the crossbeam. At each lifting point, the lifting ring and the lifting ring seat are fixedly connected as one unit. Bolt holes are opened on the lifting ring seat. Pre-embedded bolts are installed in the crossbeam. The pre-embedded bolts extend out of the crossbeam and are fixedly connected to the lifting ring seat by nuts.

3. The underwater casting and docking structure for precast beams and columns according to claim 2, characterized in that: Deeply embedded steel bars are also pre-embedded in the main body of the crossbeam between two adjacent lifting points, and the deeply embedded steel bars are connected to the pre-embedded bolts between the two adjacent lifting points.

4. The underwater casting and docking structure for precast beams and columns according to claim 3, characterized in that: Deeply embedded steel bars within the main body of the beam span or penetrate the mortise cavity.

5. The underwater casting and docking structure for precast beams and columns according to claim 1, characterized in that: Along the span of the beam, the mortise cavities correspond one-to-one with the columns; The crossbeams are made of concrete, and the columns are made of steel sleeve columns.

6. The underwater casting and docking structure for precast beams and columns according to claim 1, characterized in that: The water-stop clamp is a cylindrical water-stop clamp formed by two semi-circular tiles coming together to form a complete circle. Bolt clamping holes are provided on the vertical fastening wing plates at both ends of each tile. The two mating fastening wing plates are fastened together by bolts passing through the bolt clamping holes. A horizontal wing plate is fixedly connected to the surface of the vertical fastening wing plate; The water-stop clamp has a horizontally extending water-stop support at its top. A circular annular water-stop washer is provided on the water-stop support. The lower ring surface of the annular water-stop washer is tightly attached to the upper surface of the water-stop support, and the upper ring surface of the water-stop washer is tightly attached to the outer edge of the lower opening of the mortise cavity at the bottom of the crossbeam. The outer periphery of the annular water-stop gasket is set as a thickened linear edge sealing ring with a circular cross-section, and the edge sealing ring is continuous with the body of the annular water-stop gasket.

7. The underwater casting and docking structure for precast beams and columns according to claim 6, characterized in that: The annular water-stop gasket is made of high-molecular elastomer.

8. The underwater casting and docking structure for precast beams and columns according to claim 1, characterized in that: The water-stop clamp support is constructed by welding a steel ring support and a triangular steel support. The ring plane of the steel ring support is located on the radial plane of the column. The steel ring support is on top, and the triangular steel support is on the bottom. Each triangular steel support is set vertically, and the bottom surface of the steel ring support is fixedly connected to the column steel bar; The precast water-stop clamp support is fixedly connected to the top section of the column body; The upper ring surface of the steel ring support of the water-stop clamp support seat is used for the placement and support of the water-stop clamp and / or crossbeam.

9. The underwater casting and docking structure for precast beams and columns according to claim 1, characterized in that: The crossbeams are made of precast concrete.

10. The underwater casting and docking structure for precast beams and columns according to claim 1, characterized in that: The columns are made of precast concrete.

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