An outer formwork and grouting device for grouting spigot and socket joints of PCCP pipes.

Abstract

This utility model discloses an outer template and its grouting device for grouting the spigot and socket joints of PCCP pipes. The outer template includes a canvas bag, two locking wires, and two elastic pads. The canvas bag is elongated with openings at both ends. The two ends of the locking wires protrude through the openings at both ends of the canvas bag. The elastic pads are also elongated and are placed outside the canvas bag and below the locking wires. The grouting device includes a grouting pipe, one end of which is connected to a mortar hopper, and the other end injects grout into the spigot and socket joint of the PCCP pipe through a grouting port. The grouting port is constructed by the aforementioned outer template. This utility model uses a canvas bag and locking wires, with the two ends of the locking wires protruding through the openings at both ends of the canvas bag, and then twisting and tightening the two ends of the locking wires to lock the canvas bag to the outer wall of the PCCP pipe, forming an outer template. Furthermore, by adding elastic pads, the gap between the canvas bag and the PCCP pipe is sealed, preventing grout leakage during grouting and effectively improving the sealing quality.

Description

Technical Field

[0001] This utility model relates to the field of PCCP pipeline installation, specifically to an outer template and grouting device for grouting the spigot and socket joints of PCCP pipelines. Background Technology

[0002] PCCP pipe is short for Prestressed Concrete Cylinder Pipe, which refers to a water transmission pipe made by winding circumferential prestressed steel wires around a high-strength concrete core with a steel cylinder, and then spraying a dense cement mortar protective layer on top. It is widely used in large-scale water transmission projects between inter-regional water sources, water supply and distribution networks for industrial and agricultural irrigation systems, and power plant circulating water pipelines. In existing technology, the connection between PCCP pipes generally adopts a socket structure. Therefore, a 2-3 cm joint naturally forms at the socket of two PCCP pipes. To prevent water from entering the socket through this joint and causing corrosion of the socket steel plate, and to ensure a tight and leak-free connection at the socket of the pressurized water transmission pipeline, grouting is required to fill and seal this joint.

[0003] Traditional mortar injection for joints involves wrapping a thick layer of corrugated steel sheet around the outside of the joint as an outer template for grouting. Two straps are then used to tighten the steel sheet on both sides, creating a ring-shaped cavity between the steel sheet and the PCCP joint. Mortar is then injected through the grouting port at the highest point. However, the installation and shaping process of the corrugated steel sheet is quite cumbersome. Furthermore, the steel sheet itself has a certain rigidity, which can easily lead to insufficient contact between the sheet and the PCCP pipe, resulting in gaps and grout leakage during injection. This negatively impacts the sealing quality of the PCCP pipe spigot and socket joint. Utility Model Content

[0004] This utility model provides an outer template and grouting device for grouting the spigot and socket joints of PCCP pipes, which solves the problem that when using color steel tiles as the outer template for grouting the spigot and socket joints of PCCP pipes in the prior art, the construction process is complicated and the sealing performance is difficult to guarantee, which affects the sealing quality of the spigot and socket joints of PCCP pipes.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: An external template for grouting PCCP pipe socket joints includes a canvas bag, two locking wires, and two elastic pads. The canvas bag is long and narrow with openings at both ends. The locking wires are respectively located on both sides inside the canvas bag. The two ends of the locking wires pass through the openings at both ends of the canvas bag to tie the canvas bag to the PCCP pipes on both sides of the PCCP pipe socket joint, forming an external template. The elastic pad is also long and narrow, and is placed outside the canvas bag and below the locking wire to seal the gap between the canvas bag and the PCCP pipe.

[0006] Specifically, the canvas bag has mounting pockets on both sides; the locking wire is located inside the mounting pocket.

[0007] A grouting device includes a grouting pipe, one end of which is connected to a mortar hopper, and the other end of which injects grout into the spigot and socket joint of a PCCP pipe through a grouting port. The grouting port is constructed by the aforementioned outer template, specifically by using locking wires to tie a canvas bag to the PCCP pipes on both sides of the spigot and socket joint, with a gap between the two ends of the canvas bag, forming a grouting port at the top of the PCCP pipe spigot and socket joint.

[0008] Specifically, the mortar hopper is located at the top of the slope of the installation trench of the PCCP pipe, and the height of the mortar hopper is higher than the top of the PCCP pipe.

[0009] Furthermore, the grouting pipe also has a grouting head at the end away from the mortar hopper, the grouting head having a downward-facing inclined surface with rounded edges.

[0010] Furthermore, the mortar hopper is funnel-shaped, wider at the top and narrower at the bottom, and is equipped with a rod. The mortar hopper is inserted into the top of the slope of the installation groove of the PCCP pipe through the rod.

[0011] Compared with the prior art, this utility model has the following advantages and beneficial effects: This invention uses a canvas bag and locking wires. The two ends of the locking wires are passed through the openings at both ends of the canvas bag, and then the two ends of the locking wires are twisted and tightened, thereby locking the canvas bag to the outer wall of the PCCP pipe to form an outer template. In addition, an elastic pad is added to seal the gap between the canvas bag and the PCCP pipe, so as to avoid grout leakage during grouting and effectively improve the sealing quality of the spigot and socket joint of the PCCP pipe. Attached Figure Description

[0012] Figure 1 This is a usage diagram of one embodiment of the present invention.

[0013] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0014] Figure 3 This is a cross-sectional structural diagram of an embodiment of the present invention in use.

[0015] Figure 4 This is a usage diagram of another embodiment of the present invention.

[0016] Figure 5 for Figure 4 Enlarged structural diagram at point B.

[0017] Figure 6 This is a cross-sectional structural diagram of another embodiment of the present invention in use.

[0018] Figure 7 This is a cross-sectional schematic diagram of the present invention in use. For ease of illustration, the grouting head is located outside the grouting port in the figure.

[0019] The meanings of the labels in the diagram are as follows: PCCP pipe—1; PCCP pipe socket joint—2; Canvas bag—3; Installation bag—4; Locking screw—5; Elastic pad—6; Grouting pipe—7; Grouting port—8; Grouting head—9; Mortar hopper—10; Slope—11. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, so as to provide a better understanding of the concept of the present utility model, the technical problem solved, the technical features constituting the technical solution and the technical effects brought about.

[0021] like Figures 1-3 As shown, an outer template for grouting PCCP pipe socket joints includes a canvas bag 3, two locking wires 5, and two elastic pads 6. The canvas bag 3 is long and narrow with openings at both ends. The locking wires 5 are respectively located on both sides inside the canvas bag 3. The two ends of the locking wires 5 pass through the openings at both ends of the canvas bag 3, and are used to tie the canvas bag 3 to the PCCP pipes 1 on both sides of the PCCP pipe socket joint 2 to form an outer template. The elastic pad 6 is also long and narrow, and is placed outside the canvas bag 3 and below the locking wire 5 to seal the gap between the canvas bag 3 and the PCCP pipe 1.

[0022] In this invention, the canvas bag 3 serves as the main structure for grouting, functioning similarly to the corrugated steel sheet template. Its primary role is to form a sealed cavity for mortar molding after grouting. Specifically, the canvas bag 3 is strip-shaped with openings at both ends; these openings refer to the two ends of the canvas bag 3 along its axial direction. In actual use, a groove is first excavated at the bottom of the PCCP pipe socket joint 2, allowing one end of the canvas bag 3 to pass through the groove. Both ends of the canvas bag 3 then wrap around the PCCP pipe 1 from the bottom upwards, covering both the PCCP pipe 1 and the PCCP pipe socket joint 2, thus forming a relatively sealed cavity together with the PCCP pipe socket joint 2.

[0023] A locking wire 5 is provided on each side of the canvas bag 3 along the axial direction. The two sides along the axial direction refer to the left and right directions along the axial direction of the canvas bag 3, which is also the front and back directions along the axial direction of the PCCP pipe 1. This allows the two locking wires 5 to be located on both sides of the canvas bag 3 and far apart from each other. The two ends of the locking wires 5 are respectively passed through the openings at both ends of the canvas bag 3, and the two ends of the locking wires 5 are wrapped and twisted together to tighten the force between the canvas bag 3 and the PCCP pipe 1. This allows the canvas bag 3 to be pressed tightly against the outer wall of the PCCP pipe 1 on both sides of the PCCP pipe socket joint 2, and allows the canvas bag 3 to cover the entire PCCP pipe socket joint 2, thus playing a similar role to the color steel tile template as an outer template for grouting.

[0024] During this process, an elastic pad 6 is also provided on the side of the canvas bag 3 closest to the PCCP pipe 1 (that is, between the canvas bag 3 and the PCCP pipe 1, below the locking screw 5) to seal the gap between the canvas bag 3 and the PCCP pipe 1, ensuring that no grout leakage occurs during grout injection. The elastic pad here can be made of corrosion-resistant rubber such as polytetrafluoroethylene, fluororubber, or butyl rubber. It should be noted that the locking screw 5 is initially located on both sides inside the canvas bag 3. During the grout injection process, because the canvas bag 3 itself is long and has a certain width, the grout will bulge towards the side away from the PCCP pipe 1. During the grouting process, the locking screw 5 is always pressed against the edge of the canvas bag 3 to prevent the locking screw 5 from shifting inside the canvas bag 3.

[0025] The elastic pad 6 is also elongated, and its length must match that of the canvas bag 3. It can be directly placed on the side of the canvas bag 3 closest to the PCCP pipe 1. Alternatively, the elastic pad 6 can be directly placed on the outer wall of the PCCP pipe 1. When the locking wire 5 locks the canvas bag 3, the position of the elastic pad 6 should be the locking position of the locking wire 5, which also serves to seal the gaps. In addition, the locking wire 5 needs to have a certain tensile strength to prevent breakage after tightening, and also needs to have a certain degree of plasticity to prevent loosening after twisting. Therefore, iron wire, steel wire, or aluminum wire can generally be selected. Alternatively, an additional tensioner can be used to tighten the ends of the locking wire 5 after they cross, which can also achieve the effect of locking the canvas bag 3 to the PCCP pipe 1.

[0026] As a preferred embodiment, such as Figures 4-6 As shown, the canvas bag 3 has mounting bags 4 on both sides; the locking wire 5 is located inside the mounting bag 4.

[0027] In this embodiment, the left and right sides of the canvas bag 3 are respectively set as mounting bags 4, so that the mounting bags 4 are also strip-shaped and have openings at both ends to accommodate the locking wires 5 and to pre-fix the position of the locking wires 5. The mounting bags 4 can be made by directly sewing the canvas bag 3, that is, leaving a distance on both sides of the canvas bag 3 along the axial direction as mounting bags 4, and then sewing the canvas bag 3 along the axial direction, thereby dividing a certain width on both sides of the canvas bag 3 along the axial direction as mounting bags 4; or they can be made by sewing them separately, by sewing separate mounting bags 4 on both sides of the canvas bag 3 along the axial direction. Both methods can achieve the purpose of setting mounting bags 4 on the edge of the canvas bag 3.

[0028] The two ends of the locking screw 5 pass through the openings at both ends of the installation bag 4, and the two ends of the locking screw 5 are wrapped and twisted together to tighten the force between the installation bag 4 and the PCCP pipe 1. This allows the installation bag 4 to press firmly against the PCCP pipe 1 on both sides of the PCCP pipe socket joint 2 and fix the position of the canvas bag 3 so that the canvas bag 3 can cover the entire PCCP pipe socket joint 2, thus playing a similar role to the color steel tile template as a mold for mortar injection molding. It should be noted that when the installation bag 4 is present, the elastic pad 6 should be placed on the side of the installation bag 4 close to the PCCP pipe 1, or the elastic pad 6 should be placed on the outer wall of the PCCP pipe 1. When the locking screw 5 locks the installation bag 4, the installation bag 4 and the elastic pad 6 should be aligned.

[0029] A grouting device includes a grouting pipe 7, one end of which is connected to a mortar hopper 10; the other end is used to inject grout into the PCCP pipe socket joint 2 through a grouting port 8; the grouting port 8 is constructed by the aforementioned outer template, specifically: a locking wire 5 ties a canvas bag 3 to the PCCP pipe 1 on both sides of the PCCP pipe socket joint 2, and there is a gap between the two ends of the canvas bag 3, forming a grouting port 8 at the top of the PCCP pipe socket joint 2.

[0030] In this embodiment, a structure for grouting the PCCP pipe socket joint 2 inside the canvas bag 3 is provided. Specifically, when the canvas bag 3 covers the PCCP pipe socket joint 2 from below, the two ends of the canvas bag 3 are close together but not in contact, so the gap between the two ends of the canvas bag 3 serves as the grouting port 8, facilitating grouting into the PCCP pipe socket joint 2 through the grouting port 8. Alternatively, a through hole is directly provided at one end of the canvas bag 3, extending radially through the PCCP pipe 1, and this through hole serves directly as the grouting port 8. When the canvas bag 3 covers the PCCP pipe socket joint 2 on the PCCP pipe 1 from below, the through hole is naturally located at the top of the PCCP pipe 1. Grouting is performed on the canvas bag 3 through the grouting port 8. After grouting is completed, a cork or rubber plug is inserted into the grouting port 8, or a rubber patch is pasted on the grouting port 8 to temporarily seal the grouting port 8. After the mortar solidifies, the sealing of the PCCP pipe socket joint 2 is completed.

[0031] Alternatively, through holes can be provided at both ends of the canvas bag 3 to form two grouting ports 8, thereby accelerating the grouting speed.

[0032] As a further embodiment, the mortar hopper 10 is disposed at the top of the slope 11 of the installation trench of the PCCP pipe 1, and the height of the mortar hopper 10 is higher than the top of the PCCP pipe 1.

[0033] In this embodiment, since the top of the PCCP pipe 1 is arc-shaped, it is not conducive to the construction personnel to go up and down and stand for construction. Therefore, for the sake of construction convenience, the grouting port 8 is extended to the top of the slope 11 of the installation groove of the PCCP pipe 1 by the grouting pipe 7. At this time, the height of the mortar hopper 10 is higher than the height of the grouting port 8, and naturally higher than the top of the PCCP pipe 1. Therefore, when mortar is poured into the mortar hopper 10, the mortar will flow freely along the grouting pipe 7 and enter the PCCP pipe socket joint 2 through the grouting port 8 until the entire PCCP pipe socket joint 2 is filled.

[0034] As a further embodiment, the grouting pipe 7 also has a grouting head 9 at the end away from the mortar hopper 10, the grouting head 9 having a downward inclined surface with rounded edges.

[0035] In this embodiment, a structure for optimizing the grouting process is provided. When grouting is performed on the PCCP pipe socket joint 2 through the grouting port 8, grouting pipe 7 and grout hopper 10, since the grouting pipe 7 is tubular, after the grout enters the PCCP pipe socket joint 2 from the grouting hopper 10 through the grouting pipe 7, the inner wall of the canvas bag 3 may approach or cover the grout outlet of the grouting pipe 7, hindering the flow of grout and causing poor grouting. Therefore, a grouting head 9 is installed at the end of the grouting pipe 7 furthest from the mortar hopper 10. The grouting head 9 has an inclined surface facing downwards. This changes the direction of the grout outlet of the grouting pipe 7 from being located at the front end of the grouting pipe 7 axially and facing the canvas bag 3, to having the front end of the inclined surface lift the canvas bag 3 and change the direction of the grout outlet of the grouting pipe 7 downwards. This reduces the influence of the inner wall of the canvas bag 3 on the grouting process, prevents the canvas bag 3 from covering the grout outlet of the grouting pipe 7 and causing obstruction, and ensures a smooth grouting process. At the same time, in order to prevent the edge of the inclined surface of the grouting head 9 from cutting the canvas bag 3, the grouting head 9 needs to be chamfered, so that the edge of the grouting head 9 changes from a sharp corner to a rounded corner, thereby ensuring the integrity of the canvas bag 3 and preventing grout leakage caused by damage to the canvas bag 3.

[0036] As a further embodiment, such as Figure 7 As shown, the mortar hopper 10 is funnel-shaped with a larger top and a smaller bottom, and is also equipped with a plug rod. The mortar hopper 10 is inserted into the top of the slope 11 of the PCCP pipe 1 installation groove through the plug rod.

[0037] In this embodiment, a further technical solution for installing the mortar hopper 10 is provided. Specifically, when the mortar hopper 10 is placed on top of the slope 11 of the PCCP pipe 1 installation groove, a rod is inserted into the soil at the top of the slope 11 to fix the mortar hopper 10 and prevent it from moving during grouting. The mortar hopper 10 is funnel-shaped, wider at the top and narrower at the bottom, which facilitates the mortar to flow down and penetrate into the canvas bag 3.

[0038] The terms "connection" and "fixing" appearing in this utility model description can refer to fixed connection, processing and forming, welding, or mechanical connection. The specific meaning of the above terms in this utility model should be understood according to the specific circumstances.

[0039] In the description of this utility model, the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc., are used only to indicate the orientation or positional relationship for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An outer formwork for grouting the spigot and socket joints of PCCP pipes, characterized in that, Includes a canvas bag (3), two locking wires (5) and two elastic pads (6); the canvas bag (3) is long and narrow with openings at both ends; the locking wires (5) are respectively located on both sides inside the canvas bag (3); the two ends of the locking wires (5) pass through the openings at both ends of the canvas bag (3) to tie the canvas bag (3) to the PCCP pipes (1) on both sides of the PCCP pipe socket joint (2) to form an outer template; The elastic pad (6) is also long and strip-shaped, and is placed outside the canvas bag (3) and below the locking wire (5) to seal the gap between the canvas bag (3) and the PCCP pipe (1).

2. The outer formwork for grouting the socket joint of a PCCP pipe as described in claim 1, characterized in that, The canvas bag (3) has mounting bags (4) on both sides; the locking wire (5) is located inside the mounting bag (4).

3. A grouting device, characterized in that, It includes a grouting pipe (7), one end of which is connected to a mortar hopper (10), and the other end is grouted into the PCCP pipe socket joint (2) through a grouting port (8); the grouting port (8) is constructed by the outer template as described in claim 1 or 2, specifically: the locking wire (5) ties the canvas bag (3) to the PCCP pipe (1) on both sides of the PCCP pipe socket joint (2), and there is a gap between the two ends of the canvas bag (3), forming a grouting port (8) at the top of the PCCP pipe socket joint (2).

4. A grouting device as described in claim 3, characterized in that, The mortar hopper (10) is located at the top of the slope (11) of the installation trench of the PCCP pipe (1), and the height of the mortar hopper (10) is higher than the top of the PCCP pipe (1).

5. A grouting device as described in claim 4, characterized in that, The grouting pipe (7) also has a grouting head (9) at the end away from the mortar hopper (10). The grouting head (9) has an inclined surface facing downwards, and the edge of the inclined surface is a rounded edge.

6. A grouting device as described in claim 4, characterized in that, The mortar hopper (10) is a funnel-shaped structure with a larger top and a smaller bottom, and is also equipped with a plug rod. The mortar hopper (10) is inserted into the top of the slope (11) of the installation groove of the PCCP pipe (1) through the plug rod.

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