Prefabricated pier wet joint vacuum pressure injection construction method

Abstract

The prefabricated pier wet joint vacuum pressure injection construction method comprises the steps that S1, when a pier column is prefabricated, a mud jacking pipeline is pre-buried, one end of the mud jacking pipeline extends out of the bottom of the pier column, and the other end of the mud jacking pipeline extends out of the side face of the pier column to serve as a connecting end; s2, a pier column and a wet joint grouting formwork are installed; s3, the connecting end of the mud jacking pipeline is connected with a vacuumizing device; s4, self-compacting concrete is poured into the wet joint grouting formwork till the top of the wet joint grouting formwork is filled with the self-compacting concrete; s5, a vacuumizing device is started until the self-compacting concrete pumped out of the grouting pipeline is uniform and compact, and then the vacuumizing device is stopped; s6, after the wet joint concrete reaches certain strength, the vacuumizing device and the wet joint grouting formwork are disassembled; and S7, after the wet joint concrete reaches the design strength, the part, extending out of the pier column, of the mud jacking pipeline is cut off and beautified. According to the method, the compactness quality of the pier and abutment wet joint is improved, and rapid pouring connection of the prefabricated pier column and the bearing platform wet joint is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wet joint construction of prefabricated piers, and more specifically, to a vacuum injection construction method for wet joints of prefabricated piers. Background Art

[0002] There are generally two types of connection techniques for prefabricated piers and caps: grouting sleeve connection and wet joint connection. When the prefabricated pier column and the cap are connected by wet joint, the conventional method is to directly close the mold and pour with a grout outlet reserved. However, due to the small inner cavity space of the contact surface between the prefabricated pier and the cap, it is a post-casting working surface, which is difficult for personnel, equipment, and small machines to enter, making it difficult to fill the wet joint and difficult to vibrate. Therefore, gaps will be formed at the pier-cap interface, bringing quality and safety risks. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] In order to achieve these purposes and other advantages according to the present invention, a prefabricated pier wet joint vacuum injection construction method is provided, comprising the following steps: S1. When prefabricating the pier column, a grouting pipe is pre-buried, one end of the grouting pipe extends out of the bottom of the pier column, and the other end extends out from the side of the pier column as a connecting end; S2, installing the pier column and the wet joint grouting template, wherein the top of the wet joint grouting template exceeds the wet joint top opening; S3, connecting a vacuum device to the connecting end of the grouting pipeline; S4, pouring self-compacting concrete into the wet joint grouting formwork until the self-compacting concrete fills the top of the wet joint grouting formwork; S5, turning on the vacuum device until the self-compacting concrete extracted from the grouting pipe is uniform and dense, and then turning off the vacuum device; S6, after the wet joint concrete reaches a certain strength, disassembling the vacuum device and the wet joint grouting template; S7. After the wet joint concrete reaches the designed strength, the portion of the grouting pipe extending out of the pier column is cut off and beautified.

[0005] Preferably, the vacuum extraction device comprises a first vacuum pipe, a valve, a second vacuum pipe and a vacuum device which are sequentially connected to the grouting pipe; an overflow hole is provided at one end of the second vacuum pipe close to the vacuum device, and a plugging cover is provided at the overflow hole.

[0006] Preferably, step S5 specifically includes: opening the vacuum device until the self-compacting concrete flowing out of the overflow hole is uniform and dense, closing the valve and the vacuum device, and then removing the vacuum device and the second vacuum pipe.

[0007] Preferably, after the wet joint concrete reaches a certain strength, the valve and the first vacuum pipe are removed.

[0008] Preferably, the grouting pipe is in an L-shaped structure, with the vertical section located at the center of the pier and the horizontal section arranged close to the top of the pier.

[0009] Preferably, the bottom of the vertical section of the grouting pipe extends 3 to 5 cm beyond the bottom of the pier.

[0010] Preferably, the first vacuum pipe is in an L-shaped structure, a horizontal section of which is detachably connected to a horizontal section of the grouting pipe, and a vertical section of which is arranged vertically upward and connected to the valve.

[0011] Preferably, the top of the wet joint grouting template exceeds the top of the wet joint by 15 to 25 cm.

[0012] The present invention has at least the following beneficial effects: 1. The present invention provides a method for vacuum grouting construction of wet joints of prefabricated piers. When the piers are prefabricated, grouting pipes are pre-buried. After grouting into the wet joint grouting template, a vacuum device is turned on. Under the action of atmospheric pressure, the slurry surface in contact with the atmosphere will drop, and at the same time, the self-compacting concrete inside will rise along the grouting pipe. In this process, the atmospheric pressure is used to fill the wet joints, thereby improving the density quality of the pier wet joints, realizing the rapid pouring connection of the wet joints of the prefabricated piers and the caps, and improving the wet joint construction efficiency.

[0013] 2. The vacuum injection construction method for wet joints of prefabricated piers provided by the present invention uses a vacuum extraction device with strong versatility. The first vacuum pipeline, valve, and second vacuum pipeline can be repeatedly used, further reducing the construction cost.

[0014] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the vacuum pumping device of the present invention; Figure 2 It is a structural schematic diagram of the wet joint after the step S2 is completed in the vacuum injection construction method for wet joints of prefabricated piers according to the present invention; Figure 3It is a structural schematic diagram of the wet joint after the step S3 is completed in the vacuum injection construction method for wet joints of prefabricated piers according to the present invention; Figure 4 It is a structural schematic diagram of the wet joint after step S4 is completed in the vacuum injection construction method for wet joints of prefabricated piers according to the present invention; Figure 5 It is a schematic diagram of the process of the self-compacting concrete flowing from the grouting pipe to the overflow hole in step S5 of the vacuum injection construction method for wet joints of prefabricated piers according to the present invention; Figure 6 It is a structural schematic diagram of the wet joint after the vacuum device and the second vacuum pipeline are disassembled in step S5 of the wet joint vacuum injection construction method of the prefabricated pier according to the present invention; Figure 7 It is a structural schematic diagram of the wet joint after the step S6 is completed in the vacuum injection construction method for wet joints of prefabricated piers according to the present invention; Figure 8 It is a structural schematic diagram of the wet joint after the step S7 is completed in the vacuum injection construction method for wet joints of prefabricated piers according to the present invention; DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0017] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1 As shown, the present invention provides a prefabricated pier wet joint vacuum injection construction method, comprising the following steps: S1. When prefabricating the pier 1, a grouting pipe 2 is pre-buried, wherein one end of the grouting pipe 2 extends out of the bottom of the pier 1, and the other end extends out of the side of the pier 2 as a connecting end; S2, installing the pier column 1 and the wet joint grouting template 8, wherein the top of the wet joint grouting template 8 exceeds the wet joint top opening; S3, connecting a vacuum device to the connecting end of the grouting pipe 2; S4, pouring self-compacting concrete into the wet joint grouting formwork 8 until the self-compacting concrete fills the top of the wet joint grouting formwork; S5, turning on the vacuum device until the self-compacting concrete extracted from the grouting pipe 2 is uniform and dense, and then turning off the vacuum device; S6, after the wet joint concrete reaches a certain strength, dismantle the vacuum device and the wet joint grouting template 8; S7. After the wet joint concrete reaches the designed strength, the portion of the grouting pipe extending out of the pier column is cut off and beautified.

[0019] In this technical solution, the grouting pipe 2 is pre-buried as a vacuum channel during the prefabrication of the pier, and the wet joint grouting template 8 is arranged along the outer circumference of the wet joint. After grouting into the template, the vacuum device is turned on; under the action of atmospheric pressure, the slurry surface in contact with the atmosphere will drop, and at the same time, the self-compacting concrete inside will rise along the grouting pipe 2. In this process, the atmospheric pressure is used to fill the wet joint, thereby improving the density quality of the pier wet joint, realizing the rapid pouring connection of the wet joint between the prefabricated pier 1 and the base 10, and improving the construction efficiency of the wet joint.

[0020] In step S1, when the pier 1 is prefabricated, the grouting pipe 2 is pre-buried in the pier 1. Specifically, the grouting pipe 2 is an L-shaped structure, with the vertical section located at the center of the pier 1 and the horizontal section arranged near the top of the pier 1. The bottom of the vertical section of the grouting pipe extends 3 to 5 cm from the bottom of the pier.

[0021] In step S2, Figure 2 As shown, the pier column 1 is connected to the reserved steel bars 9 of the cap 10 to complete the installation of the pier column. Then the wet joint grouting template 8 is installed on the outer periphery of the wet joint. To ensure the continuity of the vacuum grouting process, the top of the wet joint grouting template 8 exceeds the top of the wet joint by 15 to 25 cm, that is, the top surface of the wet joint grouting template 8 is 15 to 25 cm higher than the bottom surface of the pier column 1.

[0022] In step S3, Figure 1 and Figure 3As shown, a vacuum device is connected to the connecting end of the grouting pipe 2; the vacuum device includes a first vacuum pipe 7, a valve 6, a second vacuum pipe 5 and a vacuum device 3 which are sequentially connected to the grouting pipe 2; an overflow hole 4 is provided at one end of the second vacuum pipe 5 close to the vacuum device 3, and a plugging cover is provided at the overflow hole. The first vacuum pipe 7 is an L-shaped structure, and its horizontal section is detachably connected to the horizontal section of the grouting pipe 2, and its vertical section is vertically arranged upward and connected to the valve 6. The grouting pipe 2, the first vacuum pipe 7 and the second vacuum pipe 5 form a Z-shaped structure to increase the travel of concrete in the pipe; the vacuum device 3 is arranged at the top, and the self-compacting concrete is pressed upward in combination with the atmospheric pressure, thereby improving the compactness of the concrete in the formwork in the process.

[0023] Then in step S4, Figure 4 As shown, self-compacting concrete is poured into the wet joint grouting template 8 until the self-compacting concrete fills the top of the wet joint grouting template 8. The self-compacting concrete needs to be poured until it is flush with the top of the wet joint grouting template 8.

[0024] In step S5, Figure 5 As shown, the vacuum device 3 is turned on until the self-compacting concrete flowing out of the overflow hole 4 is uniform and dense, then the valve 6 and the vacuum device 3 are closed, and then the vacuum device 3 and the second vacuum pipe 5 are removed. The vacuum device 3 is used for vacuuming, and a vacuum machine conventionally used in engineering construction can be selected. With the vacuum device turned on, under the action of atmospheric pressure, the slurry surface in contact with the atmosphere in the wet joint grouting template 8 will drop, and at the same time, the self-compacting concrete inside will be pressed into the grouting pipe 2, and pass through the first vacuum pipe 7, the valve 6 and the second vacuum pipe 5 in turn. When it is observed that the concrete in the second vacuum pipe 5 exceeds the overflow hole 4, the plugging cover is opened to allow the concrete to flow out of the overflow hole 4. During this period, the vacuuming is continued until the concrete flowing out of the overflow hole 4 is uniform and dense, and then the valve 6 and the vacuum device 3 are closed. Then the vacuum device 3 and the second vacuum pipe 5 are removed, as shown in FIG. Figure 6 Preferably, the second vacuum pipe 5 is provided with an observation window corresponding to the overflow hole 4, or the time for concrete to rise in the pipe is calculated according to the lengths of the grouting pipe 2, the first vacuum pipe 7 and the second vacuum pipe 5, and then the plugging cover is opened.

[0025] In step S6, concrete curing is performed. When the wet joint concrete reaches 5MPa, the valve 6, the first vacuum pipe 7 and the wet joint grouting template 8 are removed. Figure 7 shown.

[0026] Then in step S7, after the wet joint concrete reaches the designed strength, the portion of the grouting pipe extending out of the pier is cut off and beautified, thereby completing the wet joint construction of the prefabricated pier. Figure 8 shown.

[0027] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for vacuum injection construction of wet joints of prefabricated piers, characterized in that: The following steps are involved: S1. When prefabricating the pier column, a grouting pipe is pre-buried, one end of the grouting pipe extends out of the bottom of the pier column, and the other end extends out from the side of the pier column as a connecting end; S2, installing the pier column and the wet joint grouting template, wherein the top of the wet joint grouting template exceeds the wet joint top opening; S3, connecting a vacuum device to the connecting end of the grouting pipeline; S4, pouring self-compacting concrete into the wet joint grouting formwork until the self-compacting concrete fills the top of the wet joint grouting formwork; S5, turning on the vacuum device until the self-compacting concrete extracted from the grouting pipe is uniform and dense, and then turning off the vacuum device; S6, after the wet joint concrete reaches a certain strength, disassembling the vacuum device and the wet joint grouting template; S7. After the wet joint concrete reaches the designed strength, the portion of the grouting pipe extending out of the pier column is cut off and beautified.

2. The method for vacuum injection construction of wet joints of prefabricated piers according to claim 1, characterized in that: The vacuum device comprises a first vacuum pipe, a valve, a second vacuum pipe and a vacuum device which are sequentially connected to the grouting pipe; an overflow hole is arranged at one end of the second vacuum pipe close to the vacuum device, and a plugging cover is arranged at the overflow hole.

3. The method for vacuum injection construction of wet joints of prefabricated piers according to claim 2, characterized in that: Step S5 specifically includes: opening the vacuum device until the self-compacting concrete flowing out of the overflow hole is uniform and dense, closing the valve and the vacuum device, and then removing the vacuum device and the second vacuum pipe.

4. The method for vacuum grouting of wet joints of prefabricated piers as claimed in claim 3, wherein in step S6, after the wet joint concrete reaches a certain strength, the valve and the first vacuum pipe are removed.

5. The method for vacuum injection construction of wet joints of prefabricated piers according to claim 2, characterized in that: The grouting pipeline is in an L-shaped structure, with a vertical section located at the center of the pier column and a horizontal section arranged close to the top of the pier column.

6. The method for vacuum injection construction of wet joints of prefabricated piers as claimed in claim 5, characterized in that: The bottom of the vertical section of the grouting pipe extends 3 to 5 cm beyond the bottom of the pier.

7. The method for vacuum injection construction of wet joints of prefabricated piers as claimed in claim 5, characterized in that: The first vacuum pipe is in an L-shaped structure, the horizontal section of which is detachably connected to the horizontal section of the grouting pipe, and the vertical section of which is arranged vertically upward and connected to the valve.

8. The method for vacuum injection construction of wet joints of prefabricated piers according to claim 1, characterized in that: The top of the wet joint grouting template exceeds the top of the wet joint by 15 to 25 cm.

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