Complex riverbed steel sheet pile cofferdam construction system

Abstract

The utility model provides a complex riverbed steel sheet pile cofferdam construction system which comprises a cofferdam formed by closure of steel sheet piles, a guide frame used for sinking a guide hole steel casing, external profile steel arranged on the outer side of the cofferdam and a profile steel guide frame used for guiding the external profile steel. Profile steel is placed on the upper portion of the ring beam, vertical hanging rods are arranged on the two sides of the profile steel, and platform plates are hung at the lower ends of the vertical hanging rods; corbel supports are arranged on the inner sides of the steel sheet piles, I-shaped steel is arranged on the corbel supports, and the bottom of the platform plate is placed on the I-shaped steel; enclosing purlins are welded to the inner sides of the steel sheet piles, and inner supports are arranged in the enclosing purlins; an inner side steel casing is arranged on the inner side of the guide frame, and an elastic righting device used for controlling the perpendicularity of the steel sheet pile is arranged on the inner side steel casing. The technology that the steel casing temporarily assists in supporting the steel sheet pile is adopted, the bracket support and the elastic centralizing device are arranged to temporarily support the steel sheet pile, and the perpendicularity of the steel sheet pile is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of steel sheet pile cofferdam construction, in particular to a complex riverbed steel sheet pile cofferdam construction system. Background Art

[0002] As a protective structure for underwater cap construction, steel sheet pile cofferdam has the advantages of easy operation, low construction cost, and good water-stopping effect. For complex riverbeds, especially sand-poor and large-grained pebble formation conditions, there are construction problems such as high difficulty in inserting and driving, low efficiency, and easy tilting during the steel sheet pile construction process, which seriously restricts the construction quality and progress of the steel sheet pile cofferdam.

[0003] Based on the technical difficulties in constructing steel sheet pile cofferdams in complex riverbeds, especially in sand-poor and large-grained pebble formations, the utility model provides a complex riverbed steel sheet pile cofferdam and a construction method, aiming to improve the construction quality and efficiency of the steel sheet pile cofferdam. Summary of the invention

[0004] The utility model aims to provide a complex riverbed steel sheet pile cofferdam construction system which can improve the steel sheet pile construction accuracy, enhance the integrity of the steel sheet pile cofferdam, and achieve better technical and economic benefits when applied to actual projects.

[0005] In order to solve the above technical problems, the utility model adopts the following specific scheme: a complex riverbed steel sheet pile cofferdam construction system, including a cofferdam formed by the closure of steel sheet piles, a guide frame for sinking the guide hole steel casing, an external steel section arranged on the outside of the cofferdam, and a steel section guide frame for guiding the external steel section, a ring beam is installed on the top of the steel sheet pile, and a steel section is placed on the upper part of the ring beam. Vertical hangers are arranged on both sides of the steel section, and a platform plate is suspended at the lower end of the vertical hanger; a corbel bracket is arranged on the inner side of the steel sheet pile, an I-beam is arranged on the corbel bracket, and the bottom of the platform plate is placed on the I-beam; a purlin is welded on the inner side of the steel sheet pile, and an inner support is arranged inside the purlin; an inner steel casing is arranged on the inner side of the guide frame, and an elastic straightening device and a corbel bracket for controlling the verticality of the steel sheet pile are arranged on the inner steel casing; bottom sealing concrete is arranged in the cofferdam.

[0006] Preferably, an outer steel casing is provided on the outer side of the guide frame, a corbel bracket is provided on the outer steel casing, and the guide frame is placed on the corbel bracket on the outer steel casing.

[0007] Preferably, the guide frame is a double-layer frame structure, and the guide frame is composed of a first steel section and a second steel section; the first steel section is located above the second steel section, and the first steel section constitutes the upper frame structure of the guide frame, and the second steel section constitutes the lower frame structure of the guide frame; the first steel section and the second steel section are both arranged on the corbel bracket on the outer steel casing; guide holes are arranged on the first steel section and the second steel section.

[0008] Preferably, the external steel is guided by a steel guide frame; the steel guide frame consists of three parts: a steel guide plate, a guide rail cross brace, and a positioning steel; the positioning steel is arranged on the guide rail cross brace, the steel guide plate is arranged on the positioning steel, and a steel guide groove is arranged on the steel guide plate.

[0009] Preferably, it also includes a concrete scraping device for scraping the bottom concrete, the concrete scraping device includes a scraper and a ring plate; four scrapers are arranged on the outer side of the ring plate, and the ring plate is sleeved on the inner steel casing.

[0010] Preferably, a two-way joint is provided on the inner side of the purlin; longitudinal and oblique support joints are reserved on the two-way joint, and the two-way joint is used to connect the original internal support and the newly installed internal support after the system conversion; the original internal support and the newly installed internal support are connected to the two-way joint by bolt connection.

[0011] (1) The utility model adopts an integrated guide frame for drilling and pile sinking, which improves the accuracy of drilling and pile sinking of steel sheet piles.

[0012] (2) The utility model adopts the technology of temporarily supporting the steel sheet piles with steel casing, and arranges the corbel bracket and the elastic straightening device to temporarily support the steel sheet piles, thereby ensuring the verticality of the steel sheet piles.

[0013] (3) The upper part of the operating platform of the utility model is suspended by steel sections, and the lower part is supported by steel sheet pile brackets, which solves the installation problem of the operating platform.

[0014] (4) The utility model adopts the cofferdam external steel reinforcement technology, and improves the integrity of the steel cofferdam by adding external steel outside the steel sheet pile cofferdam.

[0015] (5) The utility model adopts a steel casing-guided rotating scraping device, and a cross-rotating scraper is arranged outside the steel casing to solve the problem of scraping the bottom concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a plan view of the integrated guide frame for steel sheet pile boring and pile sinking;

[0017] Figure 2 It is the AA section view;

[0018] Figure 3 It is a schematic diagram of steel sheet piles temporarily supported by steel casing;

[0019] Figure 4 This is a schematic diagram of a steel frame hanging safety operating platform;

[0020] Figure 5 is an enlarged schematic diagram of B;

[0021] Figure 6 It is a schematic diagram of an external steel guide frame;

[0022] Figure 7 It is a schematic diagram of an assembled internal support cofferdam that is easy to change the system;

[0023] Figure 8 It is a schematic diagram of the bottom concrete construction;

[0024] Fig. 9 It is a schematic diagram of a concrete scraping device;

[0025] Fig.10 It is a plan view of the multiple drainage system of the steel sheet pile cofferdam;

[0026] Fig.11 It is a cross-section of the multiple drainage system of the steel sheet pile cofferdam;

[0027] Fig.12 This is a schematic diagram of the steel casing being lifted off;

[0028] Fig.13 It is a schematic diagram of the internal support bracket of the steel casing.

[0029] In the figure: 1-outer steel casing; 2-corbel bracket; 3-guide frame; 4-inner steel casing; 5-guide hole steel casing; 6-first steel; 7-second steel; 8-steel sheet pile; 9-elastic straightening device; 10-platform plate; 11-ring beam; 12-vertical suspension rod; 13-steel; 14-I-beam; 15-steel guide frame; 16-steel guide plate; 17-guide rail cross brace; 18-positioning steel; 19-external steel; 20-two-way connection Head; 21- purlin; 22- newly installed internal support; 23- original internal support; 24- bottom concrete; 25- concrete scraping device; 26- scraper; 27- ring plate; 28- drainage duct; 29- bottom open ditch; 30- blind well; 31- plugging duct; 32- plugging material; 33- mud pump; 34- lifted off steel casing; 35- lifting ear; 36- internal support bracket; 37- support arc support; 38- vertical connecting rod; 39- radial support. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0031] Those skilled in the art should understand that, in the disclosure of the present invention, 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 drawings, which are only for the convenience of describing the present invention 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 invention.

[0032] 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.

[0033] like Figures 1 to 13 The utility model provides a complex riverbed steel sheet pile cofferdam system, including a cofferdam formed by merging steel sheet piles 8, a guide frame 3 for sinking a guide hole steel casing, an external steel section 19 arranged on the outside of the cofferdam, and a steel section guide frame 15 for guiding the external steel section 19. A ring beam 11 is installed on the top of the steel sheet pile 8, a steel section 13 is placed on the upper part of the ring beam 11, vertical suspension rods 12 are arranged on both sides of the steel section 13, and a platform plate 10 is suspended at the lower end of the vertical suspension rod 12; a corbel bracket 2 is arranged on the inner side of the steel sheet pile 8, an I-beam 14 is arranged on the corbel bracket 2, and the bottom of the platform plate 10 is placed on the I-beam 14; a purlin 21 is welded on the inner side of the steel sheet pile 8, and an internal support is arranged inside the purlin 21. An inner steel casing 4 is arranged inside the guide frame 3, and an elastic straightening device 9 and a corbel bracket 2 for controlling the verticality of the steel sheet pile 8 are arranged on the inner steel casing 4; a bottom sealing concrete 24 is arranged in the cofferdam.

[0034] Among them, a two-way joint 20 is arranged on the inner side of the purlin 21; longitudinal and oblique support joints are reserved on the two-way joint 20, and the two-way joint 20 is used to connect the original internal support 23 and the newly installed internal support 22 after the system conversion; the original internal support 23 and the newly installed internal support 22 are both connected to the two-way joint 20 by bolt connection.

[0035] An outer steel casing 1 is arranged on the outer side of the guide frame 3, a corbel bracket 2 is arranged on the outer steel casing 1, and the guide frame 3 is placed on the corbel bracket 2 on the outer steel casing 1. The guide frame 3 is a double-layer frame structure, and the guide frame 3 is composed of a first steel section 6 and a second steel section 7; the first steel section 6 is located above the second steel section 7, the first steel section 6 constitutes the upper frame structure of the guide frame 3, and the second steel section 7 constitutes the lower frame structure of the guide frame 3; the first steel section 6 and the second steel section 7 are both arranged on the corbel bracket 2 on the outer steel casing 1; the first steel section 6 and the second steel section 7 are provided with guide holes.

[0036] When the external steel 19 is sunk, the external steel 19 is guided by the steel guide frame 15. The steel guide frame 15 is composed of three parts: a steel guide plate 16, a guide rail cross brace 17, and a positioning steel 18. The positioning steel 18 is arranged on the guide rail cross brace 17, the steel guide plate 16 is arranged on the positioning steel 18, and the steel guide plate 16 is provided with a steel guide groove.

[0037] The complex riverbed steel sheet pile cofferdam system also includes a concrete scraping device for scraping the bottom concrete. The concrete scraping device 25 includes a scraper 26 and a ring plate 27. Four scrapers 26 are arranged on the outside of the ring plate 27, and the ring plate 27 is sleeved on the inner steel casing 4.

[0038] The utility model also provides a construction method for a complex riverbed steel sheet pile cofferdam system, comprising the following specific steps:

[0039] Step 1: Pile position hole: Use the guide frame 3 to control the verticality of the steel casing 5, and perform rotary drilling and biting hole operation to ensure that the pile position is completely broken;

[0040] When sinking the lead hole steel casing 5, the lead hole steel casing 5 passes through the guide hole. The guide frame 3 is used for construction accuracy control in both the lead hole and pile sinking operations.

[0041] Step 2: Sinking and closing of steel sheet piles: After the pile position is broken, a hydraulic pile driver is used to sink the steel sheet piles 8, and the steel sheet piles 8 are closed to form a cofferdam.

[0042] The inner steel casing 4 is provided with a corbel bracket 2 and an elastic straightening device 9, which are used to temporarily control the verticality of the steel sheet pile 8. When the steel sheet pile 8 is sunk, one side of the steel sheet pile 8 contacts the corbel bracket 2 and the elastic straightening device 9, and the verticality of the steel sheet pile 8 is controlled by the elastic straightening device 9.

[0043] Step 3: Ring beam installation: Ring beam 11 is installed on the top of steel sheet pile 8 to strengthen the integrity of cofferdam; steel 13 is placed on the top of ring beam 11, vertical suspension rods 12 are arranged on both sides of steel 13, and platform plate 10 is hung at the lower end of vertical suspension rods 12; bracket 2 is arranged on the inner side of steel sheet pile 8, I-beam 14 is arranged on bracket 2, and the bottom of platform plate 10 is placed on I-beam 14. Platform plate 10 is available for operators to perform construction operations.

[0044] Step 4: Construction of external steel sections of the cofferdam: Steel guide frames 15 are set at intervals outside the cofferdam, and external steel sections 19 are sunk using a vibrating hammer to reinforce the integrity of the cofferdam. The external steel sections 19 are guided by the steel guide frames 15; the external steel sections 19 are in contact with the outer sides of the steel sheet piles 8.

[0045] When the external steel sections 19 are sunk, the steel guide plate 16 is fixed at the piling position, and the external steel sections 19 are passed through the steel guide grooves on the steel guide plate 16 and driven into the stratum.

[0046] Step 5: Installation of internal supports: The purlin 21 is welded inside the steel sheet pile 8, and internal supports are arranged inside the purlin 21 to reinforce the integrity of the cofferdam.

[0047] The purlin 21 and the inner support are both prefabricated parts; a two-way joint 20 is arranged on the inner side of the purlin 21; longitudinal and oblique support joints are reserved on the two-way joint 20, and the two-way joint 20 is used to connect the original inner support 23 and the newly installed inner support 22 after the system conversion; the original inner support 23 and the newly installed inner support 22 are both connected to the two-way joint 20 by bolt connection.

[0048] Step 6: Underwater bottom sealing concrete pouring: After the bottom of the cofferdam is desilted, the bottom sealing concrete 24 is poured; the bottom sealing concrete 24 is set in the cofferdam.

[0049] A concrete scraping device 25 is provided on the inner steel casing 4 ; the scraping plate 26 is driven to rotate by the rotating ring plate 27 , so as to achieve the scraping of the bottom sealing concrete 24 .

[0050] Step 7: Pumping out water from the cofferdam: After the bottom seal concrete 24 hardens, the mud pump 33 is used to pump out water from inside the cofferdam.

[0051] During drainage, a drainage duct 28 is provided at the bottom of the bottom concrete 24; the accumulated water inside the cofferdam is drained into the bottom open ditch 29 through the drainage duct 28 and then collected into the blind well 30, and then pumped out to the outside of the cofferdam by a mud pump 33; a plugging duct 31 is provided outside the steel sheet pile 8, and the plugging duct 31 is provided at the connection between adjacent steel sheet piles 8, and plugging material 32 can be injected into the connection between the steel sheet piles 8 through the plugging duct 31, so as to plug the leakage of the steel sheet pile 8.

[0052] The bottom seal open ditch 29 is arranged around the bottom seal concrete 24 , and the blind well 30 is located at the four top corners of the bottom seal concrete 24 .

[0053] Step 8, steel casing cutting: After the drainage of the accumulated water inside the cofferdam is completed, the inner steel casing 4 is cut off and the inner steel casing 4 is lifted off; then the pile head is chiseled off to facilitate the subsequent construction of the internal foundation of the cofferdam.

[0054] When lifting the inner steel casing 4, a lifting lug 35 is welded on the upper part of the steel casing 34 to be lifted, and the lifting rope is connected to the lifting lug 35 on the steel casing 34 to lift the steel casing 34. An inner support bracket 36 is installed inside the steel casing 34 to support the steel casing 34 internally and stabilize it, so as to prevent the inner steel casing 4 from being deformed during the lifting process.

[0055] The inner support bracket 36 is composed of a support arc support 37, a vertical connecting rod 38 and a radial support rod 39. One end of the radial support rod 39 is connected to the vertical connecting rod 38, and the other end of the radial support rod 39 is connected to the support arc support 37. The support arc support 37 is in an arc shape; when the inner support bracket 36 is placed in the steel casing 34 to be lifted off, the support arc support 37 is in contact with the inner surface of the steel casing 34 to be lifted off.

[0056] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. Complex riverbed steel sheet pile cofferdam construction system, characterized by: The invention comprises a cofferdam formed by merging steel sheet piles (8), a guide frame (3) for sinking a steel casing for a guide hole, an external steel section (19) arranged outside the cofferdam, and a steel section guide frame (15) for guiding the external steel section (19); a ring beam (11) is installed on the top of the steel sheet pile (8); a steel section (13) is placed on the top of the ring beam (11); vertical suspension rods (12) are arranged on both sides of the steel section (13); a platform plate (10) is suspended at the lower end of the vertical suspension rod (12); the inner side of the steel sheet pile (8) is provided with a steel section (13); a steel section (13) is provided on the inner side of the steel sheet pile (8 ... A corbel bracket (2) is provided, an I-beam (14) is provided on the corbel bracket (2), and the bottom of the platform plate (10) rests on the I-beam (14); a purlin (21) is welded to the inner side of the steel sheet pile (8), and an inner support is provided inside the purlin (21); an inner steel casing (4) is provided on the inner side of the guide frame (3), and an elastic straightening device (9) for controlling the verticality of the steel sheet pile (8) and a corbel bracket (2) are provided on the inner steel casing (4); and a bottom sealing concrete (24) is provided in the cofferdam.

2. The complex riverbed steel sheet pile cofferdam construction system according to claim 1 is characterized in that: An outer steel casing (1) is arranged outside the guide frame (3), a bracket bracket (2) is arranged on the outer steel casing (1), and the guide frame (3) is placed on the bracket bracket (2) on the outer steel casing (1).

3. The complex riverbed steel sheet pile cofferdam construction system according to claim 1 is characterized in that: The guide frame (3) is a double-layer frame structure, and the guide frame (3) is composed of a first steel section (6) and a second steel section (7); the first steel section (6) is located above the second steel section (7), the first steel section (6) constitutes the upper frame structure of the guide frame (3), and the second steel section (7) constitutes the lower frame structure of the guide frame (3); the first steel section (6) and the second steel section (7) are both arranged on a corbel bracket (2) on an outer steel casing (1); and guide holes are arranged on the first steel section (6) and the second steel section (7).

4. The complex riverbed steel sheet pile cofferdam construction system according to claim 1 is characterized by: The external profile steel (19) is guided by a profile steel guide frame (15); the profile steel guide frame (15) is composed of three parts: a profile steel guide plate (16), a guide rail cross brace (17), and a positioning profile steel (18); the positioning profile steel (18) is arranged on the guide rail cross brace (17); the profile steel guide plate (16) is arranged on the positioning profile steel (18); and a profile steel guide groove is arranged on the profile steel guide plate (16).

5. The complex riverbed steel sheet pile cofferdam construction system according to claim 1 is characterized in that: The invention also comprises a concrete scraping device (25) for scraping the bottom concrete. The concrete scraping device (25) comprises a scraper (26) and a ring plate (27). Four scrapers (26) are arranged on the outside of the ring plate (27). The ring plate (27) is sleeved on the inner steel casing (4).

6. The complex riverbed steel sheet pile cofferdam construction system according to claim 1 is characterized in that: A two-way joint (20) is provided on the inner side of the perimeter purlin (21); longitudinal and oblique support joints are reserved on the two-way joint (20); the two-way joint (20) is used to connect the original inner support (23) and the newly installed inner support (22) after the system conversion; the original inner support (23) and the newly installed inner support (22) are both connected to the two-way joint (20) by bolt connection.

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