Construction device and method for replacing and filling concrete in open sea area foundation

Abstract

The invention discloses a construction device and method for replacing and filling concrete in a foundation of an open sea area. The construction device comprises a floating crane and a stirring ship which are cooperatively positioned through a positioning anchor cable; at least four sets of vertical guide frames are arranged on the broadside of the floating crane ship at equal intervals in the horizontal direction, the guide frames are connected with concrete guide pipes through guide chain mechanisms, the bottoms of the concrete guide pipes are connected with triangular supporting frames, the bottom ends of the triangular supporting frames are supported on a seabed base, and a center collecting hopper is arranged in the middle of the floating crane. The central aggregate bin is communicated with the top end of the concrete guide pipe through a chute, and the stirring ship is provided with a material distributing machine for conveying concrete to the central aggregate bin. According to open sea area deepwater foundation construction, a fixed operation platform cannot be set up, a floating crane and a guide frame are used in cooperation with a stirring ship, and replacement concrete pouring is conducted through a bottom sitting method.

Description

Technical Field

[0001] The present invention relates to the field of deep - water foundation construction of bridges. More specifically, the present invention relates to a construction device and method for replacing and filling concrete at the base in an open - sea area. Background Art

[0003] For the conventional deep - water foundation construction of bridges, in order to create a dry construction environment, steel sheet pile (steel pipe pile) cofferdams, steel caissons, steel hanging cofferdams, island - building cofferdams, etc. are used as temporary water - retaining enclosing structures. Since the anchor foundation is set in the sandy strongly weathered granite layer and partially in the completely weathered granite layer, it is necessary to pre - excavate and then use C30 underwater non - dispersive concrete for replacement and reinforcement. The construction area reaches 76m×58m, and the maximum water depth is 46m. The construction is greatly affected by waves, tides, etc. The conventional construction methods cannot meet the requirements, and affected by the ocean tides, the underwater replacement and filling of concrete is extremely difficult.

[0004] For the construction of replacing and filling concrete for the anchor foundation, when using the construction method of pouring underwater concrete by the buried - pipe method, the following technical problems exist: (1) The construction area is large and most of the foundation is strongly weathered rock, and it is impossible to use conventional water - retaining enclosing structures as the construction platform for replacing and filling concrete; (2) In the strong - tide sea area, the maximum tidal range reaches 6m, and the concrete conduit cannot be fixed on the construction platform; (3) After the foundation pit is replaced and filled, the bottom flatness requirement is high, and the flatness accuracy requirement cannot exceed ±20cm. Affected by the tides, it is extremely difficult to control the elevation of the replaced and filled concrete at the base. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction device and method for replacing and filling concrete at the base in an open - sea area. Aiming at the deep - water foundation construction in an open - sea area where a fixed operation platform cannot be erected, a floating crane and a guiding frame are used, and in cooperation with a mixing barge, the bottom - sitting method is adopted for pouring the replaced and filled concrete.

[0006] The technical solution adopted by the present invention to solve this technical problem is: providing a construction device for replacing and filling concrete at the base in an open - sea area, including: a floating crane and a mixing barge that are jointly positioned by positioning anchor cables; At least four groups of vertical guiding frames are equidistantly arranged along the horizontal direction on the side of the floating crane hull. The guiding frame is connected with a concrete conduit through a chain mechanism. The bottom of the concrete conduit is connected with a triangular support frame, and the bottom end of the triangular support frame supports on the seabed base. A central aggregate hopper is arranged in the middle of the floating crane, and the central aggregate hopper is communicated with the top end of the concrete conduit through a chute. The mixing barge is provided with a batching machine for transporting concrete to the central aggregate hopper.

[0007] Preferably, for the open sea area base replacement and concrete construction device, the guiding frame is welded into a "7"-shaped truss structure by a vertical section and a horizontal section. The horizontal section is welded to the floating crane through a stiffening plate. Four limiting pulleys are symmetrically arranged along the ship width direction and the ship length direction inside the vertical section. The distance between the two limiting pulleys in each group is matched with the outer diameter of the concrete conduit.

[0008] Preferably, for the open sea area base replacement and concrete construction device, the chain hoist mechanism is a hand-operated hoist. One end is connected to the lifting lug of the guiding frame, and the other end is connected to the lifting lug of the concrete conduit. The lifting lug of the concrete conduit is arranged on the concrete conduit below the guiding frame.

[0009] Preferably, for the open sea area base replacement and concrete construction device, the triangular support frame includes two groups of transverse connecting members and diagonal connecting members. The bottom end of the diagonal connecting member is placed on the seabed base. The two groups of transverse connecting members are respectively welded at the 1 / 3 and 2 / 3 positions of the length of the diagonal connecting member. A guiding hole for the concrete conduit to pass through is provided in the middle of the transverse connecting member, and the inner wall of the guiding hole is treated smoothly.

[0010] Preferably, for the open sea area base replacement and concrete construction device, a vertical sleeve is welded on the side wall of the concrete conduit, and a sounding rope is passed through the sleeve.

[0011] Preferably, for the open sea area base replacement and concrete construction device, the diameter of the sleeve is 3 cm, and the vertical spacing of the sleeves is 6 m.

[0012] Preferably, for the open sea area base replacement and concrete construction device, the slope of the chute is not less than 1:3.5.

[0013] Preferably, for the open sea area base replacement and concrete construction device, a through-type construction operation platform is formed by splicing a steel section frame and a steel plate between adjacent guiding frames, and the construction operation platform is connected to the floating crane.

[0014] The present invention also provides a method for replacing and filling concrete in the open sea area base using the construction device described in any one of the above, including the following steps: Step 1: Set 4 groups of guiding frames at equal intervals on the side of the floating crane hull, install a concrete conduit with a triangular support frame at the bottom, place the triangular support frame on the seabed base, and adjust the concrete conduit so that its bottom is 20 cm higher than the bottom of the triangular support frame; Step 2: Divide the anchor replacement area into 7 rows longitudinally according to the flow radius of the base replacement concrete. Set 8 pouring points in each row, and synchronously pour concrete at 2 transverse points each time; Step 3: When pouring the first batch of concrete, two central aggregate hoppers are used to pour the first batch of concrete. An 8 m³ hopper is installed above the remaining concrete conduits, and continuous pouring is carried out through a chute connecting to the batching ship's distributor until the concrete elevation reaches the design elevation. After the single-row pouring is completed, the floating crane and the batching ship are shifted to the next row of pouring points, and the bottom sealing construction is repeated; Step 4: Weld a casing on the side of the concrete conduit, pass the sounding rope through the bottom of the casing and tie a deep-water sounding weight, and measure the concrete elevation in real time through the sounding rope.

[0015] Preferably, in the construction method of replacing and filling concrete for the open sea area foundation, in Step 3, after the single-row pouring is completed, the coordinated shifting of the floating crane and the batching ship is realized by synchronously retracting the positioning anchor cables.

[0016] The present invention has at least the following beneficial effects: 1. For the construction of deep-water foundations in open sea areas where it is impossible to erect a fixed operation platform, a floating crane and a guiding frame are used, and in cooperation with a batching ship, the bottom sitting method is adopted for replacing and filling concrete pouring.

[0017] 2. Limit pulleys are arranged inside the guiding frame, which provides positioning guidance for the conduit and ensures that the conduit can move freely up and down inside the guiding frame during ebb and flow tides.

[0018] 3. The construction operation platform adopts a steel section and steel plate structure to connect between the guiding frames, facilitating the passage of construction personnel and the measurement of the bottom concrete elevation.

[0019] 4. The triangular support frame adopts a frame structure, is welded to the bottom of the conduit and supported on the foundation bottom to prevent large deformations caused by the impact of water flow on the conduit.

[0020] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. Description of the Drawings

[0021] Figure 1 It is the front view of a construction device for replacing and filling concrete for the foundation of an open sea area according to the present invention; Figure 2 It is the top view of a construction device for replacing and filling concrete for the foundation of an open sea area according to the present invention; Figure 3 It is the front view of the guiding frame in a construction device for replacing and filling concrete for the foundation of an open sea area according to the present invention; Figure 4 It is the top view of the guiding frame in a construction device for replacing and filling concrete for the foundation of an open sea area according to the present invention; Figure 5 It is the front view of the triangular support frame in a construction device for replacing and filling concrete for the foundation of an open sea area according to the present invention; Figure 6 It is the top view of the triangular support frame in a construction device for replacing and filling concrete in the base of an open sea area according to the present invention; Figure 7 It is the structural diagram of the construction operation platform in a construction device for replacing and filling concrete in the base of an open sea area according to the present invention; Explanation of the reference numerals: 1. floating crane, 2. mixing barge, 3. central aggregate hopper, 4. guiding frame, 41. horizontal section, 42. vertical section, 5. chute, 6. distributor, 7. 8 m³ hopper, 8. limit pulley, 9. concrete conduit, 10. triangular support frame, 101. transverse connecting member, 102. diagonal connecting member, 11. sleeve, 12. stiffening plate, 13. construction operation platform, 14. seabed base, 15. positioning anchor cable, 16. anchor replacement area, 17. chain hoist mechanism. Detailed implementation manners

[0022] The present invention will be described in detail and completely below with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that: the technical solutions and technical features provided in each part including the following description in the present invention can be combined with each other without conflict.

[0023] In addition, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, and the specific implementation process is as follows: As Figure 1-7 shown, the present invention provides a construction device for replacing and filling concrete in the base of an open sea area, including: a floating crane 1 and a mixing barge 2 positioned in coordination through a positioning anchor cable 15; in this embodiment, a preferred implementation is that the other end of the positioning anchor cable 15 is anchored to a seabed pile.

[0025] At least four groups of vertical guiding frames 4 are equidistantly arranged along the horizontal direction on the side of the floating crane 1. The guiding frame 4 is connected with a concrete conduit 9 through a chain hoist mechanism 17. The bottom of the concrete conduit 9 is connected with a triangular support frame 10 to prevent the concrete conduit 9 from rising and falling with the tide. The bottom end of the triangular support frame 10 supports on the seabed base 14. A central aggregate hopper 3 is arranged in the middle of the floating crane 1. The central aggregate hopper 3 is communicated with the top end of the concrete conduit 9 through a chute 5. The mixing barge 2 is provided with a distributor 6 for conveying concrete to the central aggregate hopper 3.

[0026] Furthermore, for the open sea area base replacement concrete construction device, the guiding frame 4 is formed by welding a vertical section 42 and a horizontal section 41 into a "7"-shaped truss structure. The horizontal section 41 is welded to the floating crane 1 through a stiffening plate 12. Four limiting pulleys 8 are symmetrically arranged along the ship width direction and the ship length direction of the floating crane 1 inside the vertical section 42. The distance between the two limiting pulleys 8 in each group is matched with the outer diameter of the concrete conduit 9. The setting of the limiting pulleys 8 in the guiding frame 4 provides positioning and guiding for the concrete conduit 9, and at the same time ensures that the concrete conduit 9 can move up and down freely in the guiding frame 4 during ebb and flow tides.

[0027] Furthermore, for the open sea area base replacement concrete construction device, the chain hoist mechanism 17 is a manual hoist. One end of it is connected to the lifting lug of the guiding frame 4, and the other end is connected to the lifting lug of the concrete conduit 9. The lifting lug of the concrete conduit 9 is arranged on the concrete conduit 9 below the guiding frame 4. Usage method: Install a chain hoist on the guiding frame 4, tighten the manual hoist, and use a steel wire rope to lift the concrete conduit 9; Usage timing: When the pouring point is transferred, the concrete conduit 9 needs to be lifted upward to prevent the bottom of the concrete conduit 9 from being blocked on the seabed surface.

[0028] Furthermore, for the open sea area base replacement concrete construction device, the triangular support frame 10 includes two groups of transverse connectors 101 and diagonal connectors 102. The bottom end of the diagonal connector 102 is placed on the seabed base 14. The two groups of transverse connectors 101 are respectively welded at the 1 / 3 and 2 / 3 positions of the length of the diagonal connector 102 to form a double-layer inverted triangular support structure. A guiding hole for the concrete conduit 9 to pass through is opened in the middle of the transverse connector 101. The inner wall of the guiding hole is smoothed to ensure that the concrete conduit 9 can float freely in the vertical direction.

[0029] Furthermore, for the open sea area base replacement concrete construction device, a vertical sleeve 11 is welded to the side wall of the concrete conduit 9. A sounding rope is threaded through the sleeve 11, and the sleeve 11 provides a guiding channel for the sounding rope.

[0030] Furthermore, for the open sea area base replacement concrete construction device, the diameter of the sleeve 11 is 3 cm, and the vertical spacing of the sleeves 11 is 6 m.

[0031] Furthermore, for the open sea area base replacement concrete construction device, the slope of the chute 5 is not less than 1:3.5, ensuring that the concrete can slide smoothly under the action of gravity and avoiding flow blockage, accumulation or blockage caused by too small a slope.

[0032] Furthermore, in the open sea foundation bed replacement concrete construction device, a through-type construction operation platform 13 is formed by splicing a steel section frame and steel plates between adjacent guide frames 4. The construction operation platform 13 is connected to the floating crane 1, facilitating the passage of construction personnel and the measurement of the elevation of the foundation bed concrete.

[0033] The present invention also provides an open sea foundation bed replacement concrete construction method using the above-mentioned construction device, which includes the following steps: Step 1: After the foundation pit is excavated and the foundation bed is cleaned, four groups of guide frames 4 are arranged at equal intervals on the ship's side of the floating crane 1, and a concrete conduit 9 with a triangular support frame 10 at the bottom is installed. The triangular support frame 10 is placed on the seabed foundation bed 14 to ensure the free lifting of the concrete conduit. Adjust the concrete conduit 9 so that its bottom is 20 cm higher than the bottom of the triangular support frame 10. Step 2: According to the flow radius of the foundation bed replacement concrete (considered as 5 m), the anchor replacement area 16 is longitudinally divided into seven rows, with eight pouring points arranged in each row. Synchronous concrete pouring is carried out for two points horizontally at a time. Step 3: During the first sealing pouring, two central aggregate hoppers 3 are used for the first batch of concrete pouring. In this embodiment, the central aggregate hopper is a 20 m³ hopper. An 8 m³ hopper 7 is installed above the remaining concrete conduits 9. Due to the limitation of the boom length of the batching plant 6 of the mixing barge 2, a chute 5 and a support are erected between the central aggregate hopper 3 and the concrete conduit 9 for concrete transportation. The slope of the chute 5 is not less than 1:3.5. Continuous pouring is carried out by connecting the chute 5 to the batching plant 6 of the mixing barge 2 until the concrete elevation reaches the design elevation. After a single row of pouring is completed, the floating crane 1 and the mixing barge 2 are shifted to the next row of pouring points, and the bottom sealing construction is repeated. Step 4: As the construction area is an open sea with semi-diurnal tides, to prevent the influence of ebb and flow tides and water flow on the accuracy of the sounding rope, a sleeve 11 is welded to the side of the concrete conduit 9, the sounding rope is passed through the bottom of the sleeve 11 and a sounding weight is tied, and the concrete elevation is measured in real time through the sounding rope.

[0034] Furthermore, in the open sea foundation bed replacement concrete construction method, in Step 3, after a single row of pouring is completed, the coordinated shift of the floating crane 1 and the mixing barge 2 is achieved by synchronously retracting the positioning anchor cables 15.

[0035] The present invention uses a mixing barge 2 and a floating crane 1 to partially fill the excavated foundation pit with C30 non-segregating concrete. The floating crane 1 is provided with a concrete conduit 9, a guide frame 4, and a construction operation platform 13. To ensure the pouring quality of the foundation pit replacement concrete, the replacement concrete within the anchor area is all poured at one time. The replacement concrete construction adopts the underwater concrete bottom sealing process with two central aggregate hoppers 3 for the first pouring and multiple conduits arranged. To prevent the concrete conduit 9 from rising and falling with the tide, a triangular support frame 10 is installed at the bottom of the concrete conduit 9.

[0036] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. An open sea area base replacement concrete construction device, characterized in that, include: The floating crane and mixing vessel are co-positioned by positioning anchor cables; At least four groups of vertical guide frames are equidistantly arranged on the side of the floating crane in the horizontal direction. The guide frames are connected to the concrete conduit through a chain guide mechanism. The bottom of the concrete conduit is connected to a triangular support frame. The bottom end of the triangular support frame is supported on the seabed base. A central aggregate hopper is provided in the middle of the floating crane. The central aggregate hopper is connected to the top of the concrete conduit through a chute. The mixing ship is provided with a placing machine for conveying concrete to the central aggregate hopper.

2. The open sea area base replacement concrete construction device according to claim 1, characterized in that, The guide frame is welded into a "7"-shaped truss structure by vertical and horizontal sections. The horizontal section is welded to the floating crane through a stiffening plate. Four limiting pulleys are symmetrically arranged on the inner side of the vertical section along the ship width and ship length directions of the floating crane. The spacing between the two limiting pulleys in each direction matches the outer diameter of the concrete conduit.

3. The open sea area base replacement concrete construction device according to claim 1, characterized in that, The chain guide mechanism is a hand chain hoist, one end of which is connected to the lifting lug of the guide frame, and the other end is connected to the lifting lug of the concrete conduit. The lifting lug of the concrete conduit is arranged on the concrete conduit below the guide frame.

4. The open sea area base replacement concrete construction device according to claim 1, characterized in that, The triangular support frame includes two groups of transverse connectors and oblique connectors. The bottom ends of the oblique connectors are placed on the seabed base. The two groups of transverse connectors are respectively welded at 1 / 3 and 2 / 3 of the length of the oblique connectors. A guide hole for the concrete conduit to pass through is opened in the middle of the transverse connector, and the inner wall of the guide hole is smoothed.

5. The open sea area base replacement concrete construction device according to claim 1, characterized in that, A vertical sleeve is welded to the side wall of the concrete conduit, and a measuring rope is inserted into the sleeve.

6. The open sea area base replacement concrete construction device according to claim 5, characterized in that, The casing diameter is 3 cm, and the vertical spacing of the casing is 6 m.

7. The open sea area base replacement concrete construction device according to claim 1, characterized in that, The slope of the chute is not less than 1:3.

5.

8. The open sea area base replacement concrete construction device according to claim 1, characterized in that, A through-type construction operation platform is formed between adjacent guide frames by splicing steel frames and steel plates, and the construction operation platform is connected to the floating crane.

9. An open sea area base replacement concrete construction method using the construction device according to any one of claims 1-8, characterized in that, The steps include: Step 1: Set 4 sets of guide frames at equal intervals on the side of the floating crane, install a concrete conduit with a triangular support frame at the bottom, place the triangular support frame on the bottom of the seabed, and adjust the concrete conduit so that its bottom is 20 cm higher than the bottom of the triangular support frame; Step 2: According to the flow radius of the base replacement concrete, the anchor replacement area is divided into 7 rows in the longitudinal direction, 8 pouring points are set in each row, and the concrete is poured synchronously at 2 points in the horizontal direction at a time; Step 3: During the first pouring, two central collecting hoppers are used to pour the first batch of concrete. An 8m³ hopper is installed above the remaining concrete conduits, and the concrete is poured continuously by connecting the concrete distributor of the mixing ship through the chute until the concrete elevation reaches the designed elevation. After the single row pouring is completed, the floating crane and the mixing ship are moved to the next row of pouring points, and the bottom sealing construction is repeated; Step 4: Weld a casing on the side of the concrete conduit, pass a measuring rope through the bottom of the casing and attach a depth weight, and use the measuring rope to measure the concrete elevation in real time.

10. The open sea area base replacement concrete construction method according to claim 9, characterized in that, In the step three, after the single-row pouring is completed, the coordinated displacement of the floating crane and the mixing ship is achieved by synchronously contracting the positioning anchor cable.

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