Steel pipe-steel plate combined cofferdam underwater bearing platform in navigable water area and construction method thereof

Abstract

The invention relates to a navigable water area steel pipe-steel plate combined cofferdam underwater bearing platform and a construction method thereof. The construction method comprises the steps of guide frame installation, steel pipe pile-steel plate pile crossed inserting and driving, prestressed inner support installation, enclosing purlin gap filling, upper layer inner support anti-falling construction, bearing platform formwork installation and the like. The method has the advantages of being high in pile sinking positioning precision, convenient to install the prestressed inner support, high in formwork erecting speed and high in construction safety, and good technical and economic benefits can be obtained when the method is applied to actual engineering.

Description

Technical Field

[0001] The invention relates to the field of bridges, and in particular to an underwater bearing platform of a steel pipe-steel plate combined cofferdam in navigable waters and a construction method thereof. Background Art

[0002] The existing retaining structures are basically steel pipe pile cofferdams and steel sheet pile cofferdams, and the rare ones are steel pipe-steel plate combined cofferdams. Although the steel pipe-steel plate combined cofferdam is less used, the combination of its steel sheet piles and steel pipe piles can form a stable and high-strength water-stopping structure. However, there are still some problems in the construction process of the steel pipe-steel plate combined cofferdam, such as how to control the verticality and positioning accuracy of the steel pipe-steel sheet piles during the insertion process, how to fill the gap between the steel sheet piles and the purlins to effectively transmit the force, how to prevent the upper internal support from falling during the excavation process, how to apply prestress to the internal support, and how to facilitate the erection of the foundation formwork. In view of the above existing problems, an underwater foundation and a construction method of a steel pipe-steel plate combined cofferdam in navigable waters are proposed from the aspects of the guide frame structure, the internal support structure, the gap filling formwork structure, and the formwork erection. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide an underwater cap for a steel pipe-steel plate combined cofferdam in navigable waters and a construction method thereof.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0005] The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters includes the following steps:

[0006] Step 1: Guide frame installation:

[0007] Several double rows of positioning piles are inserted around the designed position of the cofferdam, and brackets are installed on the positioning piles. H-shaped steel is placed on the brackets to form a guide frame for convenient steel pipe pile insertion;

[0008] Step 2: Cross-insertion of steel pipe piles and steel sheet piles:

[0009] Start from one side and vertically drive the steel pipe pile along the guide frame, then install the L-shaped guide frame on the guide frame, rotate the handle bolt to tighten the L-shaped guide frame, align one side of the steel sheet pile with the steel pipe pile lock buckle and the other side with the notch on the L-shaped guide frame, and then vertically drive the steel sheet pile;

[0010] Then loosen the handle bolt, move the L-shaped guide frame forward, and drive the steel pipe piles first, then repeat the above steel sheet pile steps to drive the steel sheet piles until all the steel pipe piles and steel sheet piles are driven;

[0011] Step 3: Installation of prestressed inner support:

[0012] Install the corbels on the steel pipe piles, place the perimeter purlins on the corbels and fix them with the steel pipe piles;

[0013] Install several joints on the purlin, and install the inner supports with hydraulic devices on the joints;

[0014] Then, according to the designed prestress, the jack in the hydraulic device is started, and pressure is applied step by step until the designed prestress is reached;

[0015] Step 4: Fill the gap between the purlins:

[0016] Drill holes in the steel formwork with the extension plate and fit it tightly under the perimeter purlin where the steel sheet piles are located;

[0017] Then, the vertical rod is installed at the end of the extension plate, the horizontal rod is connected to the vertical rod, the steel wire rope is passed through the hole on the horizontal rod until it passes through the hole on the steel formwork, and the steel wire rope is tightened and fixed with an anchor;

[0018] Then install the tie bars in the area to be filled, and then pour the concrete. After the concrete reaches the required strength, remove the formwork. First remove the upper and lower anchors, and then remove the crossbars, vertical bars, extension plates and steel formwork;

[0019] Step 5: Construction of upper internal support to prevent falling:

[0020] Install the clamp on the inner support of the first floor, install the ear seat on the corresponding steel pipe pile, and install the two ends of the inclined rod on the ear seat and the ear plate of the clamp respectively;

[0021] Step 6: Installation of the foundation template:

[0022] The formwork for erecting the foundation is assembled with standard block formwork, special-shaped formwork and angle steel formwork. At the same time, screws are inserted through the slot plates on the formwork and then fixed with nuts.

[0023] The cross brace with the clamping plate is installed in the groove of the slot plate. Several prefabricated connectors are welded on the cross brace. At the same time, a circle of steel is welded on the steel pipe pile. Several prefabricated connectors are also welded on the steel. The two ends of the supporting steel pipe with the second connecting plate are respectively connected to the prefabricated connectors on the steel and the prefabricated connectors on the cross brace.

[0024] Furthermore, a second wing plate is provided at the bottom of the L-shaped guide frame, and a plurality of rollers are installed on the inner side of each second wing plate on both sides thereof. The L-shaped guide frame is placed on the first wing plate of the guide frame, a plurality of threaded holes are punched on the outer side of the second wing plate, and then the handle bolts are screwed into the threaded holes, and the anti-slip pads are fixed on the ends of the handle bolts.

[0025] Furthermore, the prestressed internal support is mainly composed of a steel section, a hydraulic device and a first connecting plate. The first connecting plate is installed on one side of the steel section, and the first connecting plate is connected to the first connecting plate at one end of the hydraulic device. The first connecting plate at the other end of the hydraulic device is connected to the first connecting plate on the joint. The other side of the steel section is directly connected to the connecting plate and is also connected to the first connecting plate on the joint. The first connecting plates are connected by a second bolt.

[0026] Furthermore, the hydraulic device includes a first connecting plate, a sleeve, a hydraulic strut, and a jack. A circular groove is provided in the center of the sleeve for installing the jack, and a plurality of grooves are provided around the edge of the sleeve for installing the hydraulic strut, which play a supporting role. The sleeve is connected to the first connecting plate, and a plurality of bolt holes are provided on the first connecting plate. The jack and the top of the hydraulic strut are installed on the first connecting plate.

[0027] Furthermore, the steel template is processed into a shape equal to the gap to be filled, an L-shaped groove is formed at one end of the extension plate, and the extension plate is welded after being fitted to one end of the steel template. A threaded hole is drilled at the other end of the extension plate, and the bottom of the vertical rod is set to a threaded structure, and then the bottom of the vertical rod is screwed into the threaded hole and fixed on the extension plate.

[0028] The top of the vertical rod is set as a concave mortise with a bolt hole, and one end of the horizontal rod is set as a convex tenon with a bolt hole, and the convex tenon and the concave mortise are fitted together and fixed with a first bolt;

[0029] The wire rope passes through the holes on the crossbar and then through the holes on the steel formwork, and then the wire ropes at both ends are anchored with anchors.

[0030] Furthermore, a buffer device is arranged in the central area of ​​the diagonal tie rod, one end of the upper tie rod is arranged as a semicircular joint connected to the ear seat, and the other end is embedded in the end of a high-strength spring, one end of the lower tie rod is arranged as a semicircular joint connected to the ear plate, and the other end is embedded in the end of a high-strength spring, and then the upper tie rod and the lower tie rod are locked, and the high-strength spring is embedded in the inside of the diagonal tie rod.

[0031] Furthermore, the standard block formwork, the special-shaped formwork, and the angle steel formwork are all steel formworks, and a groove plate is provided on the standard block formwork and the special-shaped formwork, and a number of holes are provided on the groove plate, and the standard block formwork and the special-shaped formwork are overlapped according to the design shape of the pedestal, wherein the angle steel formwork is used at the four corners to connect and reinforce the standard block formwork;

[0032] The screw rods pass through the holes on the slot plate, and nuts are set on both sides of each slot plate to fasten the templates on both sides. Several holes are opened in the angle steel template for the screw rods to pass through, and nuts are used to fix the ends of the screw rods. Several screw rods are integrally connected to several standard block templates, special-shaped templates and angle steel templates.

[0033] Furthermore, a cross brace is arranged at the adjacent screw rods, and the cross brace is installed on the slot plate through the groove on the slot plate, and a clamping plate is arranged on both sides of the cross brace, and the clamping plate is tightly attached to the slot plate, and a plurality of prefabricated connectors are welded on the cross brace, and a steel section is installed at the same height as the steel pipe pile corresponding to the cross brace, and a plurality of prefabricated connectors are welded on the steel section, and a second connecting plate is arranged at both ends of the supporting steel pipe, and the second connecting plates at both ends of the supporting steel pipe are connected with the prefabricated connecting head to form a stable support system;

[0034] The horizontal brace on the relatively erected standard block formwork is lower than other horizontal braces, and the second connecting plates at both ends of the supporting steel pipe are respectively connected to the prefabricated connecting heads on the relatively erected horizontal brace to form a counter brace.

[0035] The underwater capping platform of the steel pipe-steel plate combined cofferdam in navigable waters is constructed by using the above-mentioned construction method of the underwater capping platform of the steel pipe-steel plate combined cofferdam in navigable waters.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The present invention provides an L-shaped guide frame to cooperate with the guide frame to assist in the driving of steel pipe piles and steel sheet piles, thereby improving the driving accuracy and positioning accuracy. By providing rollers and handle bolts, the movement and fixation of the L-shaped guide frame are achieved.

[0038] 2. The present invention adopts the purlin gap filling technology and the internal support anti-falling device. The template system is overlapped between the steel sheet piles and the purlin by means of horizontal bars, vertical bars, extension plates, steel templates, steel wire ropes and anchors, which improves the convenience of pouring concrete in the gap. The steel pipe piles and the internal support are connected by the inclined rod with a buffer device to prevent the internal support from suddenly falling and affecting personal safety, thereby improving the construction safety.

[0039] 3. The present invention arranges the hydraulic device at the end of the inner support, and uses the assistance of the jack and the hydraulic strut to apply prestress to the inner support step by step, thereby improving the accuracy and convenience of applying prestress.

[0040] 4. The present invention utilizes screws to splice standard block formwork, special-shaped formwork, angle steel formwork, etc. into a cap formwork, and simultaneously utilizes cross braces, steel sections, supporting steel pipes, etc. to form a stable supporting system. This assembled formwork method improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the installation of the guide frame and the L-shaped guide frame of the present invention;

[0042] Figure 2 It is a side view of the guide frame and L-shaped guide frame structure of the present invention;

[0043] Figure 3 is a cross-sectional view taken along line AA of the present invention;

[0044] Figure 4It is a schematic diagram of the installation of the purlin gap template of the present invention;

[0045] Figure 5 is a side view of the inner support anti-falling device of the present invention;

[0046] Figure 6 It is a diagram of the prestressed inner support structure of the present invention;

[0047] Figure 7 is a cross-sectional view of a hydraulic device of the present invention;

[0048] Figure 8 It is a structural diagram of the foundation template erection of the present invention;

[0049] Fig. 9 It is a BB cross-sectional view of the present invention.

[0050] In the figure, 1, steel pipe pile; 2, steel sheet pile; 3, L-shaped guide frame; 4, guide frame; 5, handle bolt; 6, anti-skid pad; 7, roller; 8, first wing plate; 9, second wing plate; 10, surrounding purlin; 11, corbel; 12, steel formwork; 13, extension plate; 14, vertical rod; 15, horizontal rod; 16, tie bar; 17, wire rope; 18, anchor; 19, first bolt; 20, convex tenon; 21, concave mortise; 22, diagonal tie rod; 23, hoop; 24, inner support; 25, upper tie rod ; 26. Lower pull rod; 27. Ear seat; 28. Ear plate; 29. ​​High-strength spring; 30. Joint; 31. First connecting plate; 32. Second bolt; 33. Sleeve; 34. Hydraulic support rod; 35. Jack; 36. Bolt hole; 37. Standard block template; 38. Angle steel template; 39. Special-shaped template; 40. Screw; 41. Nut; 42. Slot plate; 43. Cross brace; 44. Steel section; 45. Prefabricated connector; 46. Support steel pipe; 47. Second connecting plate; 48. Card plate. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0052] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0053] Embodiment 1

[0054] like Figure 1-9 As shown, the construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in the navigable waters includes the following steps:

[0055] Step 1: Guide frame installation:

[0056] Several double rows of positioning piles are driven around the designed position of the cofferdam, and brackets 11 are installed on the positioning piles. H-shaped steel is placed on the brackets 11 to form a guide frame 4 for facilitating the driving of the steel pipe piles 1.

[0057] Step 2: Cross-insertion of steel pipe piles and steel sheet piles:

[0058] Start from one side and vertically drive the steel pipe pile 1 along the guide frame 4, then install the L-shaped guide frame 3 on the guide frame 4, rotate the handle bolt 5 to tighten the L-shaped guide frame 3, align one side of the steel sheet pile 2 with the lock buckle of the steel pipe pile 1 and the other side with the notch on the L-shaped guide frame 3, and then vertically drive the steel sheet pile 2. Loosen the handle bolt 5, move the L-shaped guide frame 3 forward, and similarly drive the steel pipe pile 1 first, then repeat the above steps for driving the steel sheet pile 2, until all the steel pipe piles 1 and steel sheet piles 2 are driven.

[0059] Specifically, Figure 2 As shown, the L-shaped guide frame 3 has a second wing plate 9 at the bottom, and a plurality of rollers 7 are installed on the inner side of each second wing plate 9 on both sides. The L-shaped guide frame 3 is placed on the first wing plate 8 of the guide frame 4, and a plurality of threaded holes are punched on the outer side of the second wing plate 9. The handle bolt 5 is then screwed into the threaded hole, and the anti-slip pad 6 is fixed to the end of the handle bolt 5.

[0060] It is worth noting that, through the cooperation of the handle bolt 5 and the roller 7, the L-shaped guide frame 3 can be slid or fixed on the guide frame 4, so as to achieve the purpose of positioning the steel sheet pile 2 for insertion.

[0061] Step 3: Installation of prestressed inner support:

[0062] The corbel 11 is installed on the steel pipe pile 1, and the purlin 10 is placed on the corbel 11 and fixed to the steel pipe pile 1. Several joints 30 are installed on the purlin 10, and the inner support 24 with a hydraulic device is installed on the joints 30. Then, according to the designed prestress, the jack 35 in the hydraulic device is started, and pressure is applied step by step until the designed prestress is reached.

[0063] Specifically, the prestressed inner support 24 is mainly composed of a steel section 44, a hydraulic device and a first connecting plate 31. The first connecting plate 31 is installed on one side of the steel section 44, and the first connecting plate 31 is connected to the first connecting plate 31 at one end of the hydraulic device. The first connecting plate 31 at the other end of the hydraulic device is connected to the first connecting plate 31 on the joint 30. The other side of the steel section 44 is directly connected to the connecting plate and is also connected to the first connecting plate 31 on the joint 30. The first connecting plates 31 are connected by second bolts 32.

[0064] Among them, the hydraulic device includes a first connecting plate 31, a sleeve 33, a hydraulic strut 34, and a jack 35. A circular groove is set in the center of the sleeve 33 to install the jack 35, and a plurality of grooves are set around the edge of the sleeve 33 to install the hydraulic strut 34 to play a supporting role. The sleeve 33 is connected to the first connecting plate 31, and a plurality of bolt holes 36 are set on the first connecting plate 31. The jack 35 and the top of the hydraulic strut 34 are installed on the first connecting plate 31.

[0065] Step 4: Fill the gap between the purlins:

[0066] The steel formwork 12 with the extension plate 13 is drilled and placed tightly under the purlin 10 where the steel sheet piles 2 are located. The vertical rod 14 is then installed at the end of the extension plate 13, and the horizontal rod 15 is connected to the vertical rod 14. The steel wire rope 17 is passed through the hole on the horizontal rod 15 until it passes out of the hole on the steel formwork 12, and the steel wire rope 17 is tightened and fixed with the anchor 18. The tie bar 16 is then installed in the area to be filled, and then concrete is poured. After the concrete reaches the strength, the formwork is removed, and the upper and lower anchors 18 are removed first, and then the horizontal rod 15, vertical rod 14, extension plate 13 and steel formwork 12 are removed.

[0067] Specifically, the steel template 12 is processed into a shape equal to the gap to be filled, an L-shaped groove is formed at one end of the extension plate 13, and welded after fitting one end of the steel template 12, a threaded hole is drilled at the other end of the extension plate 13, the bottom of the vertical rod 14 is set to a threaded structure, and then the bottom of the vertical rod 14 is screwed into the threaded hole and fixed on the extension plate 13, the top of the vertical rod 14 is set to a concave mortise 21 with a bolt hole 36, and one end of the cross bar 15 is set to a convex tenon 20 with a bolt hole 36, and the convex tenon 20 and the concave mortise 21 are fitted and fixed with a first bolt 19. The steel wire rope 17 passes through the hole on the cross bar 15, and then passes through the hole on the steel template 12, and then the steel wire rope 17 at both ends is anchored by an anchor 18.

[0068] Step 5: Construction of upper internal support to prevent falling:

[0069] The clamp 23 is installed on the inner support 24 of the first floor, and the ear seat 27 is installed on the corresponding steel pipe pile 1, and the two ends of the inclined rod 22 are respectively installed on the ear seat 27 and the ear plate 28 of the clamp 23.

[0070] Specifically, a buffer device is arranged in the central area of ​​the diagonal tie rod 22, one end of the upper tie rod 25 is arranged as a semicircular joint connected to the ear seat 27, and the other end is embedded in the end of the high-strength spring 29, one end of the lower tie rod 26 is arranged as a semicircular joint connected to the ear plate 28, and the other end is embedded in the end of the high-strength spring 29, and then the upper tie rod 25 and the lower tie rod 26 are locked, and the high-strength spring 29 is embedded in the inside of the diagonal tie rod 22.

[0071] It is worth noting that since the lock of the upper and lower pull rods 26 will bounce open when subjected to a huge impact force, the high-strength spring 29 plays its buffering role, preventing the impact force of the inner support 24 from suddenly falling and destroying the entire anti-falling device, causing failure.

[0072] Step 6: Installation of the foundation template

[0073] The cap erection template is assembled with standard block template 37, special-shaped template 39 and angle steel template 38, and screw rod 40 is inserted through the groove plate 42 on the template, and then fixed with nut 41. The cross brace 43 with the clamping plate 48 is further installed in the groove on the groove plate 42, and a number of prefabricated connectors 45 are welded on the cross brace 43. At the same time, a circle of steel section 44 is welded on the steel pipe pile 1, and a number of prefabricated connectors 45 are also welded on the steel section 44. The two ends of the supporting steel pipe 46 with the second connecting plate 47 are respectively connected to the prefabricated connectors 45 on the steel section 44 and the prefabricated connectors 45 on the cross brace 43.

[0074] Specifically, the standard block template 37, the special-shaped template 39, and the angle steel template 38 are all steel templates. The standard block template 37 and the special-shaped template 39 are provided with a slot plate 42, and a plurality of holes are provided on the slot plate 42. The standard block template 37 and the special-shaped template 39 are overlapped according to the design shape of the pedestal, wherein the angle steel template 38 is used at the four corners to connect and reinforce the standard block template 37. The screw rod 40 passes through the holes on the slot plate 42, and nuts 41 are provided on both sides of each fitting slot plate 42 to tighten the templates on both sides. The angle steel template 38 has a plurality of holes for the screw rod 40 to pass through, and the nuts 41 are used to fix the ends of the screw rod 40. A plurality of screw rods 40 are integrally connected to a plurality of standard block templates 37, special-shaped templates 39, and angle steel templates 38.

[0075] Furthermore, cross braces 43 are provided at adjacent screw rods 40, and the cross braces 43 are installed on the slot plate 42 through grooves on the slot plate 42. Clamps 48 are provided on both sides of the cross brace 43, and the clamps 48 are tightly attached to the slot plate 42. A number of prefabricated connecting heads 45 are welded on the cross brace 43, and steel sections 44 are installed at the same height of the cross brace 43 corresponding to the steel pipe pile 1, and a number of prefabricated connecting heads 45 are welded on the steel sections 44. Second connecting plates 47 are provided at both ends of the supporting steel pipe 46, and the second connecting plates 47 at both ends of the supporting steel pipe 46 are connected to the prefabricated connecting heads 45 to form a stable support system.

[0076] Furthermore, the cross brace 43 on the relatively erected standard block formwork 37 is slightly lower than the other cross braces 43 , and the second connecting plates 47 at both ends of the supporting steel pipe 46 are respectively connected to the prefabricated connecting heads 45 on the relative cross brace 43 to form a counter-brace.

[0077] Embodiment 2

[0078] The underwater capping platform of the steel pipe-steel plate combined cofferdam in navigable waters is manufactured by using the above-mentioned construction method of the underwater capping platform of the steel pipe-steel plate combined cofferdam in navigable waters.

[0079] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0080] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0081] Although the term "such as" is used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0082] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A construction method for a steel pipe-steel plate combined cofferdam underwater cap in navigable waters, characterized in that: The following steps are involved: Step 1: Guide frame installation: A plurality of double rows of positioning piles are inserted around the designed position of the cofferdam, and brackets (11) are installed on the positioning piles. H-shaped steel is placed on the brackets (11) to form a guide frame (4) for facilitating the insertion of the steel pipe piles (1); Step 2: Cross-insertion of steel pipe piles and steel sheet piles: Starting from one side, the steel pipe pile (1) is vertically inserted along the guide frame (4), and then the L-shaped guide frame (3) is installed on the guide frame (4). The handle bolt (5) is rotated to tighten the L-shaped guide frame (3), and one side of the steel sheet pile (2) is aligned with the locking buckle of the steel pipe pile (1) and the other side is aligned with the notch on the L-shaped guide frame (3), and then the steel sheet pile (2) is vertically inserted; Then loosen the handle bolt (5), move the L-shaped guide frame (3) forward, and first drive the steel pipe pile (1) and then repeat the above-mentioned steel sheet pile (2) steps to drive the steel sheet pile (2) until all the steel pipe piles (1) and steel sheet piles (2) are driven; Step 3: Installation of prestressed inner support: Installing a corbel (11) on the steel pipe pile (1), placing the perimeter purlin (10) on the corbel (11) and fixing it to the steel pipe pile (1); A plurality of joints (30) are installed on the purlin (10), and an inner support (24) with a hydraulic device is installed on the joints (30); Then, according to the designed prestress, the jack (35) in the hydraulic device is started to apply pressure step by step until the designed prestress is reached; Step 4: Fill the gap between the purlins: Drill holes in the steel formwork (12) with the extension plate (13), and place the steel formwork (12) tightly against the lower part of the perimeter purlin (10) where the steel sheet piles (2) are located; Then, the vertical rod (14) is installed at the end of the extension plate (13), the horizontal rod (15) is connected to the vertical rod (14), the steel wire rope (17) is passed through the hole on the horizontal rod (15) until it passes through the hole on the steel template (12), and the steel wire rope (17) is pulled close and fixed with an anchor (18); Then, tie bars (16) are installed in the area to be filled, and then concrete is poured. After the concrete reaches a certain strength, the formwork is removed. The upper and lower anchors (18) are removed first, and then the crossbars (15), vertical bars (14), extension plates (13) and steel formwork (12) are removed; Step 5: Construction of upper internal support to prevent falling: Install a clamp (23) on the inner support (24) of the first floor, install an ear seat (27) on the corresponding steel pipe pile (1), and install the two ends of the inclined rod (22) on the ear seat (27) and the ear plate (28) of the clamp (23) respectively; Step 6: Installation of the foundation template: The capping platform erection template is assembled by using a standard block template (37), a special-shaped template (39) and an angle steel template (38), and a screw (40) is inserted through a groove plate (42) on the template, and then fixed with a nut (41); A cross brace (43) with a clamping plate (48) is installed at a groove on the groove plate (42), and a plurality of prefabricated connectors (45) are welded on the cross brace (43). At the same time, a circle of profile steel (44) is welded on the steel pipe pile (1), and a plurality of prefabricated connectors (45) are also welded on the profile steel (44). The two ends of a supporting steel pipe (46) with a second connecting plate (47) are respectively connected to the prefabricated connectors (45) on the profile steel (44) and the prefabricated connectors (45) on the cross brace (43).

2. The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters according to claim 1 is characterized in that: The bottom of the L-shaped guide frame (3) is provided with a second wing plate (9), and a plurality of rollers (7) are installed inside each second wing plate (9) on both sides thereof. The L-shaped guide frame (3) is placed on the first wing plate (8) of the guide frame (4), and a plurality of threaded holes are punched on the outside of the second wing plate (9). The handle bolt (5) is then screwed into the threaded hole, and the end of the handle bolt (5) is fixed with an anti-slip pad (6).

3. The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters according to claim 1 is characterized in that: The prestressed inner support (24) is mainly composed of a steel section (44), a hydraulic device and a first connecting plate (31). The first connecting plate (31) is installed on one side of the steel section (44), the first connecting plate (31) is connected to the first connecting plate (31) at one end of the hydraulic device, the first connecting plate (31) at the other end of the hydraulic device is connected to the first connecting plate (31) on the joint (30), the other side of the steel section (44) is directly connected to the connecting plate, and is also connected to the first connecting plate (31) on the joint (30), and the first connecting plates (31) are connected by second bolts (32).

4. The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters according to claim 1 is characterized in that: The hydraulic device comprises a first connecting plate (31), a sleeve (33), a hydraulic support rod (34), and a jack (35). A circular groove is arranged at the center of the sleeve (33) for mounting the jack (35). A plurality of grooves are arranged around the edge of the sleeve (33) for mounting the hydraulic support rod (34) to play a supporting role. The sleeve (33) is connected to the first connecting plate (31). A plurality of bolt holes (36) are arranged on the first connecting plate (31). The top of the jack (35) and the hydraulic support rod (34) are mounted on the first connecting plate (31).

5. The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters according to claim 1 is characterized in that: The steel template (12) is processed into a shape equivalent to the gap to be filled, an L-shaped groove is formed at one end of the extension plate (13), and welding is performed after fitting one end of the steel template (12), a threaded hole is drilled at the other end of the extension plate (13), the bottom of the vertical rod (14) is set to a threaded structure, and then the bottom of the vertical rod (14) is screwed into the threaded hole and fixed on the extension plate (13); The top of the vertical rod (14) is provided with a concave mortise (21) having a bolt hole (36), and one end of the horizontal rod (15) is provided with a convex tenon (20) having a bolt hole (36). The convex tenon (20) and the concave mortise (21) are fitted together and then fixed with a first bolt (19); The steel wire rope (17) passes through the hole on the cross bar (15), and then passes through the hole on the steel template (12), and then the steel wire rope (17) at both ends is anchored by an anchor (18).

6. The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters according to claim 5 is characterized in that: A buffer device is arranged in the central area of ​​the inclined rod (22); one end of the upper rod (25) is arranged as a semicircular joint connected to the ear seat (27), and the other end is embedded in the end of the high-strength spring (29); one end of the lower rod (26) is arranged as a semicircular joint connected to the ear plate (28), and the other end is embedded in the end of the high-strength spring (29); then the upper rod (25) and the lower rod (26) are locked, and the high-strength spring (29) is embedded in the inclined rod (22).

7. The construction method of the underwater cap of the steel pipe-steel plate combined cofferdam in navigable waters according to claim 1 is characterized in that: The standard block template (37), the special-shaped template (39), and the angle steel template (38) are all steel templates. A groove plate (42) is provided on the standard block template (37) and the special-shaped template (39). A plurality of holes are provided on the groove plate (42). The standard block template (37) and the special-shaped template (39) are overlapped according to the design shape of the pedestal. The angle steel templates (38) are used at the four corners to connect and reinforce the standard block template (37). The screw rod (40) passes through the holes on the slot plate (42), and nuts (41) are arranged on both sides of each slot plate (42) to fasten the templates on both sides. The angle steel template (38) is provided with a plurality of holes for the screw rod (40) to pass through, and the nuts (41) are used to fix the ends of the screw rod (40). The plurality of screw rods (40) are integrally connected to a plurality of standard block templates (37), special-shaped templates (39) and angle steel templates (38).

8. The method for constructing a submerged cap of a steel pipe-steel plate combined cofferdam in navigable waters according to any one of claims 1 to 7, characterized in that: A cross brace (43) is arranged at the adjacent screw rods (40), and the cross brace (43) is installed on the groove plate (42) through a groove on the groove plate (42). A clamping plate (48) is arranged on both sides of the cross brace (43), and the clamping plate (48) is closely attached to the groove plate (42). A plurality of prefabricated connecting heads (45) are welded on the cross brace (43), and a steel section (44) is installed at the same height as the steel pipe pile (1) of the cross brace (43), and a plurality of prefabricated connecting heads (45) are welded on the steel section (44). A second connecting plate (47) is arranged at both ends of the supporting steel pipe (46), and the second connecting plates (47) at both ends of the supporting steel pipe (46) are connected to the prefabricated connecting heads (45) to form a stable support system; The cross brace (43) on the relatively erected standard block formwork (37) is lower than the other cross braces (43), and the second connecting plates (47) at both ends of the supporting steel pipe (46) are respectively connected to the prefabricated connecting heads (45) on the relatively erected cross brace (43) to form a counter brace.

9. The underwater cap of steel pipe-steel plate combined cofferdam in navigable waters is characterized by: The invention is manufactured by using the construction method of the underwater foundation of the steel pipe-steel plate combined cofferdam in navigable waters as described in any one of claims 1 to 8.

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