Construction method for underwater concrete secondary pouring

Abstract

The application discloses a construction method for underwater concrete secondary pouring, which is characterized by the following technical scheme: a sealing movable device is arranged at the bottom of a pump pipe, a conical body top fixed channel steel and a guide pipe bottom fixed channel steel are buckled and connected to form a one-way rotation structure, and the conical body and the guide pipe are connected through wire binding. After the sealing movable device and the pump pipe enter the concrete liquid surface and the depth meets the requirement, a crane is used to guide a steel wire rope through a conical body outer steel wire rope guide channel to pull the hollow steel plate conical body, so that the wire binding force is pulled off, the conical body top fixed channel steel and the guide pipe bottom fixed channel steel buckle can only rotate in one direction, and the hollow steel plate conical body can rotate in one direction after the wire binding is pulled off, so that the hollow steel plate conical body is turned over outward, the structure after the turning over outward is beneficial to the turning out of the concrete liquid surface, and thus the quality problems of broken piles or clamped slag in the concrete are avoided.

Description

Technical Field

[0001] This invention relates to the technical field of underwater concrete pouring, specifically a construction method for secondary underwater concrete pouring. Background Technology

[0002] With the rapid development of national infrastructure construction, the construction of highway bridges has gradually increased. Among them, the concrete pouring of bridge pile foundations is mostly carried out by underwater concrete pouring. After the pile foundation is drilled, a guide pipe is installed at the bottom of the hole, and underwater concrete is poured through the guide pipe. During the concrete pouring process, manual labor and machinery are needed to continuously lift and remove the guide pipe. Often, the guide pipe is pulled out of the concrete liquid surface in the middle, causing quality problems such as broken piles or slag inclusions. At present, there is no good way to solve such problems. In view of this, in-depth research was conducted on the above problems, and thus this invention was developed. Summary of the Invention

[0003] The purpose of this invention is to solve the quality problem of pile breakage or slag inclusion caused by the pump pipe being pulled out of the concrete surface during the pouring process. To solve this problem, the inventors, through practical experience and summarization using on-site conditions, created a simple and practical structure and obtained the following technical solution:

[0004] A construction method for underwater secondary concrete pouring, comprising a reinforcing cage, square timber, a guide pipe fixing device, a hopper, a guide pipe, and a mud slurry support, characterized by the following construction steps:

[0005] S1: Determine the location of the pile foundation on site according to the design drawings, and install concrete cross-shaped protective piles in the surrounding soil.

[0006] S2: Carry out pile foundation drilling construction, using mud slurry support until the pile foundation hole is completed;

[0007] S3: Install the reinforcing bars. Use a crane to lift and lower each section of the reinforcing cage. Connect the ends of each section of the reinforcing cage with sleeves. Fix the end of the last section of the reinforcing cage to the I-beam.

[0008] S4: Install the guide pipe fixing device and square timber at the top of the pile hole, put in the guide pipe, install the hopper at the top of the guide pipe, and pour concrete. During the pouring process, keep the guide pipe inserted into the concrete for 2-6m, and measure the burial depth of the guide pipe with a measuring rope from time to time.

[0009] S5: Due to worker carelessness, the guide pipe was accidentally pulled out of the concrete liquid surface, or quality problems occurred during the production or transportation of concrete, resulting in the inability to pour concrete in time. While waiting for the concrete, in order to avoid the guide pipe being buried too deep and unable to be pulled out, the guide pipe needs to be temporarily pulled out.

[0010] S6: During the secondary pouring, a sealing device is installed at the bottom of the guide pipe;

[0011] The sealing device includes a conduit connector connected to a conduit and a hollow steel plate cone detachably installed with the conduit connector. One side of the conduit connector is equipped with a bottom fixing channel steel and the other side is equipped with a bottom binding wire movable buckle. One side of the hollow steel plate cone is equipped with a top fixing channel steel and the other side is equipped with a binding wire movable buckle. The top fixing channel steel and the bottom fixing channel steel are connected by a snap-fit ​​to form a one-way rotating structure. The binding wire movable buckle at the cone and the bottom binding wire movable buckle are connected by a binding wire. The outer side of the hollow steel plate cone is equipped with an external steel wire rope guide channel steel and a steel wire rope snap-fit ​​at the cone. The steel wire rope snap-fit ​​at the cone is arranged close to the external binding wire movable buckle. A steel wire rope runs through the external steel wire rope guide channel steel. A hook is installed at both ends of the steel wire rope. One hook is connected to the lifting end of the crane, and the other hook is connected to the external steel wire rope snap-fit ​​at the cone.

[0012] When the concrete arrives at the site, the duct is re-inserted into the concrete surface after the sealing device is installed. At the designated position, a crane is used to connect a steel wire rope to break the tie wire in the sealing device at the bottom of the duct, and the hollow steel plate cone is rotated outward. The fixing channel steel at the bottom of the duct and the fixing channel steel at the top of the cone are separated. Then the sealing device is pulled out of the hole, and concrete is poured until the over-pouring elevation is reached to complete the pouring task.

[0013] Preferably, the catheter and catheter connector are threaded together, and at least two sealing rings are installed at the connection.

[0014] Preferably, the maximum diameter of the cone is at least 20 cm larger than the diameter of the conduit.

[0015] Preferably, the top fixing channel steel of the cone and the bottom fixing channel steel of the guide tube are both specially processed from 10# channel steel.

[0016] Preferably, the movable ties at the cone and the movable ties at the bottom of the guide tube are made of 20mm plain round steel bars.

[0017] Preferably, the conical outer wire rope guide channel is provided with two channels, both of which are made of No. 5 channel steel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention utilizes a sealing device installed at the bottom of the pump pipe. A unidirectional rotating structure is formed by the snap-fit ​​connection between the top fixed channel steel of the cone and the bottom fixed channel steel of the guide pipe. The ties at the cone and the bottom of the guide pipe are connected by ties. After the sealing device and pump pipe are submerged in the concrete and the required depth is reached, a crane is used to guide the hollow steel cone (the side near the ties) with a steel wire rope. This forces the ties to break, and the snap-fit ​​connections at the top and bottom of the cone, which can only rotate unidirectionally, allow the hollow steel cone to rotate outwards and flip. This outward rotation facilitates the cone's escape from the concrete surface, preventing quality issues such as broken piles or inclusions in the concrete.

[0020] This invention is mainly applicable to underwater or underground engineering projects such as bridge pile foundations, cast-in-place cofferdams, caisson foundations, and diaphragm walls. It has the advantages of simple operation, safety and reliability, economy and rationality, easy portability, reusability, and guaranteed pile quality. Through the sealing and movable device installed at the bottom of the guide pipe, the secondary concrete pouring can better guarantee the pile quality and avoid pile breakage or slag inclusion caused by the guide pipe being pulled out during the secondary concrete pouring process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the sealing device at the bottom of the pump pipe according to the present invention.

[0023] Figure 3 This is a partial enlarged view of the unidirectional rotating structure in the sealing device of the present invention.

[0024] Figure 4 This is a partial enlarged view of the wire binding point in the sealing device of the present invention.

[0025] Figure 5 This is a top view of the overall structure of the present invention. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Example 1, as Figures 1 to 5 As shown, a construction method for underwater secondary concrete pouring includes a reinforcing cage 7, square timber 3, guide pipe fixing device 1, hopper 6, guide pipe 2, and mud slurry support arm 5. The construction steps are as follows:

[0029] S1: Determine the location of the pile foundation on site according to the design drawings, and install concrete cross-shaped protective piles in the surrounding soil.

[0030] S2: Carry out pile foundation drilling construction, using mud shield 5, until the pile foundation hole is formed;

[0031] S3: Install the reinforcing bars. Use a crane to lift and lower each section of the reinforcing cage 7. Connect the ends of each section of the reinforcing cage 7 with sleeves. Fix the end of the last section of the reinforcing cage 7 to the I-beam.

[0032] S4: Install the guide pipe fixing device 1 and square timber 3 at the top of the pile hole, put in the guide pipe 2, install the hopper 6 at the top of the guide pipe 2, and pour concrete. During the pouring process, keep the guide pipe 2 inserted into the concrete 2~6m, and measure the embedment depth of the guide pipe 2 with a measuring rope from time to time.

[0033] S5: Due to worker carelessness, the guide pipe 2 was accidentally pulled out of the concrete liquid surface, or quality problems occurred during the production or transportation of concrete, resulting in the inability to pour concrete in time. While waiting for the concrete, in order to avoid the guide pipe 2 being buried too deep and unable to be pulled out, the guide pipe 2 needs to be temporarily pulled out.

[0034] S6: During the secondary pouring, a sealing device 4 is installed at the bottom of the guide pipe 2;

[0035] like Figure 2 As shown, the sealing device 4 includes a conduit connector 4-12 connected to the conduit 2 and a hollow steel plate cone 4-10 detachably installed with the conduit connector 4-12. One side of the conduit connector 4-12 is fitted with a conduit bottom fixing channel steel 4-3, and the other side is fitted with a conduit bottom ligature wire hook 4-9. One side of the hollow steel plate cone 4-10 is fitted with a cone top fixing channel steel 4-4, and the other side is fitted with a cone ligature wire hook 4-8. The cone top fixing channel steel 4-4 and the conduit bottom fixing channel steel 4-3 are snap-fitted together to form a unidirectional rotation structure (e.g., ...). Figure 3As shown), the movable ligature 4-8 at the cone and the movable ligature 4-9 at the bottom of the catheter are connected by ligatures (as shown). Figure 4 As shown), the outer side of the hollow steel plate cone 4-10 is equipped with a wire rope guide channel steel 4-5 and a wire rope buckle 4-6 at the cone. The wire rope buckle 4-6 at the cone is arranged near the wire tie movable buckle 4-8 at the cone. A wire rope 4-2 passes through the wire rope guide channel steel 4-5. A hook 4-1 is installed at both ends of the wire rope 4-2. One hook 4-1 is connected to the lifting end of the crane, and the other hook 4-1 is connected to the wire rope buckle 4-6 at the cone.

[0036] When the concrete arrives at the site, after installing the sealing device 4 on the guide pipe 2, reinsert it into the concrete surface. When it reaches the designated position, use a crane to connect the wire rope 4-2 to break the binding wire in the sealing device 4 at the bottom of the guide pipe 2, and rotate the hollow steel plate cone 4-10 outward. Separate the bottom fixing channel steel 4-3 of the guide pipe and the top fixing channel steel 4-4 of the cone. Then, pull the sealing device 4 out of the hole, and pour concrete until the over-pouring elevation is reached to complete the pouring task.

[0037] The catheter 2 and catheter connectors 4-12 are connected by threads, and at least two sealing rings are installed at the connection. This ensures the sealing of the connector end, and the threaded connection allows for quick and efficient connection between the connector and the catheter.

[0038] The maximum diameter of the cone is at least 20 cm larger than the diameter of the guide tube 2. The hollow steel plate cone is made of 12 mm thick Q235 ordinary carbon structural steel. Compared with the solid cone, the hollow steel plate cone is lightweight and high-strength, convenient for transportation, and beneficial for wire rope lifting.

[0039] The top fixing channel steel 4-4 of the cone and the bottom fixing channel steel 4-3 of the conduit are both specially processed from 10# channel steel. They are welded to both sides of the conduit joint and the top of the cone, respectively, mainly serving as a temporary connection. The hollow steel plate cone can be reused.

[0040] The movable tie wires 4-8 at the cone and 4-9 at the bottom of the conduit are made of 20mm round steel bars. They are welded to both sides of the conduit joint and the top of the cone, respectively, and mainly serve as temporary connections. The hollow steel plate cone can be reused.

[0041] The conical outer surface of the steel wire rope guide channel steel 4-5 has two sections, both made of #5 channel steel. These are used to guide the direction of the steel wire rope and prevent it from deviating from its position.

[0042] Specifically: In the movable sealing device 4 at the bottom of the conduit, one end of the conduit connector 4-12 is threaded to the conduit 2, and two sealing rings 4-11 are provided at the conduit connector 4-12 to ensure the sealing performance of the connector; the other end is movably connected to the hollow steel plate cone 4-10; the conduit connector and the hollow steel plate cone 4-10 are movably connected, and two channel steels are welded on one side of the conduit connector and the hollow steel plate cone 4-10, namely the bottom fixing channel steel 4-3 of the conduit and the top fixing channel steel 4-4 of the cone. During installation, they are directly snapped together to form a single-sided movable device; on the other side of the conduit connector and the hollow steel plate cone 4-10, two U-shaped buckles are welded, namely the ties 4-8 at the cone and the bottom ties 4-9 of the conduit. During installation, ties are used to temporarily connect the conduit and the hollow steel plate cone together, thus forming the movable sealing device at the bottom of the conduit. Sealing device 4; The movable sealing device 4 at the bottom of the guide pipe has a U-shaped buckle 4-6 set in the hollow steel plate cone 4 for connecting the wire rope 4-2. A hook 4-1 is set on one side of the wire rope 4-2 and connected to the wire rope buckle outside the cone. In addition, two wire rope guide channels 4-5 are set on the cone to guide the wire rope 4-2. The other end of the wire rope is connected to the hook of the crane. After the guide pipe 2 and the movable sealing device 4 at the bottom are inserted to the specified depth of the concrete, the crane is used to lift the wire rope 4-2. The movable sealing device at the bottom of the guide pipe is subjected to tension. The wire binding wire on one side of the guide pipe joint and the movable device on the other side are broken and separated by rotation. Then the hollow steel plate cone is lifted out of the concrete liquid surface. During the second lowering of the guide pipe, the inside of the guide pipe does not come into contact with the mud. Then the underwater concrete is poured for the second time.

[0043] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A construction method for underwater secondary concrete pouring, comprising a reinforcing cage (7), square timber (3), a guide pipe fixing device (1), a hopper (6), a guide pipe (2), and a mud slurry support (5), characterized in that, The construction steps are as follows: S1: Determine the location of the pile foundation on site according to the design drawings, and install concrete cross-shaped protective piles in the surrounding soil. S2: Carry out pile foundation drilling construction, using mud shield (5) until the pile foundation hole is formed; S3: Install the reinforcing bars. Use a crane to lift each section of the reinforcing bar cage (7). Connect the ends of each section of the reinforcing bar cage (7) with sleeves. Fix the end of the last section of the reinforcing bar cage (7) to the I-beam. S4: Install the guide pipe fixing device (1) and square timber (3) at the top of the pile hole, put in the guide pipe (2), install the hopper (6) at the top of the guide pipe (2), and pour concrete. During the pouring process, keep the guide pipe (2) inserted into the concrete for 2~6m, and measure the embedment depth of the guide pipe (2) with a measuring rope from time to time. S5: Due to the carelessness of the workers, the guide pipe (2) was accidentally pulled out of the concrete liquid surface, and quality problems occurred during the production or transportation of concrete, resulting in the inability to pour concrete in time. In order to avoid the guide pipe (2) being buried too deep and unable to be pulled out while waiting for concrete, the guide pipe (2) needs to be temporarily pulled out. S6: During the secondary pouring, a sealing device (4) is installed at the bottom of the guide pipe (2). The sealing device (4) includes a conduit connector (4-12) connected to the conduit (2) and a hollow steel plate cone (4-10) detachably installed with the conduit connector (4-12). One side of the conduit connector (4-12) is fitted with a conduit bottom fixing channel steel (4-3), and the other side is fitted with a conduit bottom ties (4-9). One side of the hollow steel plate cone (4-10) is fitted with a cone top fixing channel steel (4-4), and the other side is fitted with a cone ties (4-8). The cone top fixing channel steel (4-4) and the conduit bottom fixing channel steel (4-3) are snap-fitted together to form a unidirectional rotating structure. The tie wire movable buckle (4-8) and the tie wire movable buckle (4-9) on the bottom side of the guide tube are connected by tie wire. The outer side of the hollow steel plate cone (4-10) is equipped with the outer cone wire rope guide channel steel (4-5) and the cone wire rope buckle (4-6). The cone wire rope buckle (4-6) is arranged close to the tie wire movable buckle (4-8). The outer cone wire rope guide channel steel (4-5) is filled with a wire rope (4-2). A hook (4-1) is installed at both ends of the wire rope (4-2). One hook (4-1) is connected to the lifting end of the crane, and the other hook (4-1) is connected to the cone wire rope buckle (4-6). When the concrete arrives at the site, the conduit (2) is re-inserted into the concrete liquid after the sealing device (4) is installed. When it reaches the specified position, the wire rope (4-2) of the crane is used to pull off the tie wire in the sealing device (4) at the bottom of the conduit (2), and the hollow steel plate cone (4-10) is rotated outward. The bottom fixed channel steel (4-3) of the conduit and the top fixed channel steel (4-4) of the cone are separated. Then the sealing device (4) is pulled out of the hole, and concrete is poured until the over-pouring elevation is reached to complete the pouring task.

2. The construction method for underwater secondary concrete pouring according to claim 1, characterized in that, The catheter (2) and the catheter connector (4-12) are connected by threads, and at least two sealing rings are installed at the connection.

3. The construction method for underwater secondary concrete pouring according to claim 1, characterized in that, The maximum diameter of the cone is at least 20 cm larger than the diameter of the conduit (2).

4. The construction method for underwater secondary concrete pouring according to claim 1, characterized in that, The top fixing channel steel (4-4) of the cone and the bottom fixing channel steel (4-3) of the guide tube are both specially processed from 10# channel steel.

5. The construction method for underwater secondary concrete pouring according to claim 1, characterized in that, The movable ties (4-8) at the cone and the movable ties (4-9) at the bottom of the guide tube are made of 20mm round steel bars.

6. The construction method for underwater secondary concrete pouring according to claim 1, characterized in that, The conical outer steel wire rope guide channel steel (4-5) is provided in two rows, both of which are made of No. 5 channel steel.

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