Method for preparing a socket-type prefabricated concrete conduit for power cable

Abstract

The present invention relates to the field of power construction, and specifically to a socket-type prefabricated concrete conduit for power cables and a preparation method thereof. It includes an inner liner, a stirrup frame and a concrete column; the stirrup frame has a transversely penetrating installation channel; a plurality of inner liner pipes are arranged on the inner side of the installation channel; the concrete column wraps the inner liner and the stirrup frame on the inner side, and the two ends in the length direction are respectively a socket and a spigot, the socket and the spigot are adapted, the inner end face of the socket is flush with the end face of the pipe mouth at one end of the inner liner, and the end face of the spigot is flush with the end face of the pipe mouth at the other end of the inner liner. The present invention adds a stirrup frame to improve the overall structural strength of the concrete conduit, which is not easily damaged by external forces, and the socket connection method is easy to align and install. For the produced concrete conduit, the end of the inner liner does not protrude, and a normal socket connection can be performed.

Description

Technical Field

[0001] The invention relates to the field of electric power construction, and in particular to a socket-and-spigot type prefabricated concrete conduit for a power cable and a preparation method thereof. Background Art

[0002] Common cable laying methods include direct burial, pipe laying, cable trench laying, tunnel laying and other laying methods. Among them, pipe laying is convenient for construction, has little impact on traffic due to later maintenance, and is relatively inexpensive. At present, most of the conduits on the market are prefabricated concrete conduits, with an inner liner added on the inside. The inner liner is generally made of PVC pipe, which can pass the cable and is not easy to cause cable wear. The prefabricated concrete conduit is produced according to the designed length, and an appropriate number of prefabricated concrete conduits are selected according to the actual length of use to connect them.

[0003] However, the overall structural strength of the existing precast concrete conduits is not high, and they are easily damaged by external forces, making them difficult to align and install during construction. In the existing preparation process of precast concrete conduits, it is necessary to insert the inner liner pipe at both ends of the mold, and the two ends of the inner liner pipe are exposed to the outside of the mold, resulting in uneven ends of the final precast concrete conduits. The two ends of the inner liner pipe protrude from the concrete structure, which is irregular, and the two precast concrete conduits cannot be directly aligned and installed. If you want the ends to be flush, you also need to cut off the protruding part of the inner liner pipe, which increases the production process, and the cutting process may also cause the inner liner pipe to reduce the reliability of the connection with the concrete structure due to vibration, or even loosen. Summary of the invention

[0004] The purpose of the present invention is to address the problems existing in the background technology and to propose a socket-type prefabricated concrete conduit for power cables and a preparation method thereof, by adding a stirrup frame to improve the overall structural strength of the concrete conduit, making it less susceptible to damage by external forces, and the socket connection method is easy to align and install. For the produced concrete conduit, the end of the inner liner pipe does not protrude, and a normal socket connection can be performed.

[0005] On the one hand, the present invention proposes a socket-and-spigot type prefabricated concrete conduit for power cables, comprising an inner liner pipe, a stirrup frame and a concrete column; the stirrup frame has a transversely penetrating installation channel; a plurality of inner liner pipes are arranged on the inner side of the installation channel; the concrete column wraps the inner liner pipe and the stirrup frame on the inner side, and the two ends in the length direction are respectively a socket and a spigot, the socket and the spigot are adapted, the inner end face of the socket is flush with the end face of the pipe mouth at one end of the inner liner pipe, and the end face of the spigot is flush with the end face of the pipe mouth at the other end of the inner liner pipe.

[0006] Preferably, the liner pipe comprises a main pipe and a guiding pipe, and the diameter of the main pipe is larger than the diameter of the guiding pipe.

[0007] Preferably, the stirrup frame includes multiple steel bars, steel rings and positioning ribs. Multiple steel bars are arranged along the contour of the steel rings, and multiple steel rings are arranged side by side along the length direction of the stirrup frame. The positioning ribs are upwardly raised arc-shaped rod-shaped structures. The positioning ribs are arranged on the steel rings and are located on the inner side of the stirrup frame.

[0008] On the other hand, the present invention provides a method for preparing the above-mentioned socket-type prefabricated concrete conduit for power cable, which is implemented by preparing a mold and comprises the following steps:

[0009] S1, opening the side mold a, side mold b, top mold and end mold in the preparation mold;

[0010] S2, placing a plurality of liner pipes inside the stirrup rack, and placing the liner pipes and the stirrup rack into a U-shaped bottom mold in the preparation mold;

[0011] S3, rotating the side mold a and the side mold b, fixing the side mold a with the bottom mold, fixing the side mold b with the bottom mold, inserting the positioning column at the side mold a and the positioning column at the side mold b into the inner sides of the two ends of the liner tube respectively, and the two ends of the liner tube are respectively abutted on the side mold a and the side mold b;

[0012] S4, pouring concrete into the bottom form, and the concrete wraps the stirrup frame and the inner lining pipe;

[0013] S5. When the top surface of the concrete is flush with the top surface of the bottom mold, rotate the top mold, cover the top mold on the top of the bottom mold and fix it, fix the end mold on the bottom mold, and pour concrete from the pouring port of the top mold until the concrete overflows to the bottom of the pouring port;

[0014] S6. After the concrete solidifies into a concrete column, move the positioning column out from the inner side of the inner lining pipe, open the side form a, side form b, top form and end form, and remove the prepared socket-type prefabricated concrete conduit for power cables.

[0015] Preferably, between steps S1 and S2, a process of spraying a release agent on the bottom mold, the side mold a, the side mold b, the top mold and the end mold is added.

[0016] Preferably, between steps S5 and S6, a steam heating curing process is added to shorten the concrete curing time.

[0017] Preferably, the concrete is vibrated when poured.

[0018] Preferably, the end of the positioning column is distributed in a cone shape, and a heating device is added inside the positioning column. When the positioning column is inserted into the lining tube, the heating device transfers heat to the lining tube through the positioning column. The positioning column squeezes the lining tube, the lining tube is deformed by the heat, and the end is expanded.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] 1. The addition of stirrups improves the overall structural strength of the concrete conduit, making it less susceptible to external force damage. The concrete column has a socket and a spigot, and the socket connection is easy to align and install. The end of the liner does not protrude, and a normal socket connection can be performed;

[0021] 2. When the concrete conduit is taken out from the preparation mold, the requirement of the end face of the liner pipe being flush is met, which ensures the reliability of the integral connection of the concrete conduit without the need for additional cutting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a socket-type prefabricated concrete conduit for a power cable according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Structural cross-sectional view of

[0024] Figure 3 for Figure 1 Exploded diagram of the structure;

[0025] Figure 4 It is a schematic diagram of the structure where the positioning ribs are placed on the inner liner pipe;

[0026] Figure 5 It is a structural schematic diagram of a preparation mold used in a method for preparing a socket-type prefabricated concrete conduit for a power cable according to an embodiment of the present invention;

[0027] Figure 6 A cross-sectional view of the local structure of the mold is prepared;

[0028] Figure 7 It is a structural schematic diagram of opening the side mold a, side mold b, top mold and end mold in the preparation mold;

[0029] Figure 8 for Figure 7 A magnified view of the structure at center.

[0030] Figure numerals: 1. lining pipe; 2. stirrup frame; 21. positioning rib; 3. concrete column; 4. bottom mold; 41. reinforcing rib; 42. positioning platform; 5. side mold a; 6. fixing frame; 7. push-pull button; 8. sliding rod; 9. positioning column; 10. side mold b; 11. bracket; 12. rotating cylinder a; 13. bolt a; 14. top mold; 141. notch; 1401. pouring port; 15. rotating cylinder b; 16. bolt b; 17. end mold; 171. positioning hole; 18. bolt c. DETAILED DESCRIPTION

[0031] Embodiment 1

[0032] like Figure 1-Figure 4As shown, the present embodiment provides a socket-type prefabricated concrete conduit for power cables, comprising an inner liner pipe 1, a stirrup frame 2 and a concrete column 3.

[0033] The stirrup frame 2 has a transverse installation channel that runs through it. The stirrup frame 2 includes multiple steel bars, steel rings and positioning ribs 21. Multiple steel bars are arranged along the contour of the steel rings, and multiple steel rings are arranged side by side along the length direction of the stirrup frame 2. The positioning ribs 21 are upwardly raised arc-shaped rod-shaped structures. The positioning ribs 21 are arranged on the steel rings and are located on the inner side of the stirrup frame 2. The positioning ribs 21 can be placed on the inner lining pipe 1, so that the steel bars and steel rings are suspended. After the concrete conduit is finally produced, the stirrup frame 2 can be distributed in the center.

[0034] The inner lining pipe 1 is made of PVC and is arranged in multiple pieces inside the installation channel. The inner lining pipe 1 includes a main pipe and a guide pipe. The diameter of the main pipe is larger than that of the guide pipe. The number and arrangement of the main pipe and the guide pipe can be flexibly adjusted according to production requirements. Figure 1 There are four main supervisors and one assistant supervisor.

[0035] The concrete column 3 wraps the liner pipe 1 and the stirrup frame 2 inside. The two ends of the length direction of the concrete column 3 are respectively a socket and a spigot. The socket and the spigot are adapted. The spigot end of one concrete conduit can be inserted into the socket end of another concrete conduit. The socket connection is easy to locate and install. The inner end face of the socket is flush with the end face of the pipe mouth at one end of the liner pipe 1, and the end face of the spigot is flush with the end face of the pipe mouth at the other end of the liner pipe 1. The end of the stirrup frame 2 is flush with the end of the concrete column 3.

[0036] The present embodiment adds a stirrup frame 2, which surrounds the outer side of the inner liner pipe 1, thereby improving the overall structural strength of the concrete conduit and making it less susceptible to damage by external forces. The concrete column 3 has a socket and a spigot, and the socket connection is easy to align and install. The end of the inner liner pipe 1 does not protrude, and a normal socket connection can be performed.

[0037] Embodiment 2

[0038] This embodiment provides a method for preparing a socket-type prefabricated concrete conduit for a power cable. Figure 5-Figure 8 As shown, the socket-type prefabricated concrete conduit for the power cable in Example 1 is prepared by preparing a mold.

[0039] The preparation mold includes a bottom mold 4, a side mold a5, a side mold b10, a top mold 14, an end mold 17, a positioning assembly and a reinforcing rib 41. The bottom mold 4 is a U-shaped structure with the U-shaped opening facing upwards. The side molds a5 and the side molds b10 are respectively rotatably connected at both ends of the length direction of the bottom mold 4. The side mold a5 includes an integrally connected mounting plate portion and a prism portion, and the prism portion is used for forming the socket of the concrete column 3. The side mold b10 has a prism-shaped forming groove, and the size of the forming groove gradually decreases along the direction away from the bottom mold 4. The side mold a5 has a side ear a at the outer end, and the side ear a has a slot a. The side mold b10 has a side ear b at the outer end, and the side ear b has a slot b. A plurality of connection assemblies are arranged on the bottom mold 4, and the connection assemblies include a bracket 11 arranged on the bottom mold 4, a rotating cylinder a12 rotatably arranged on the bracket 11, and a bolt a13 threadedly connected to the rotating cylinder a12, and the end of the bolt a13 is connected to an anti-drop platform a to prevent the bolt a13 from falling off from the rotating cylinder a12. When the side form a5 and the side form b10 are rotated to the position of fitting with the bottom form 4, the bolt a13 is rotated, and the bolt a13 is inserted into the slot a or the slot b. Then, the bolt a13 can be screwed in using an electric tool, and the bolt a13 is pressed against the side ear a or the side ear b, thereby firmly fixing the side form a5 and the side form b10. The side form a5, the side form b10 and the bottom form 4 form a pouring space with an opening facing upward for pouring concrete.

[0040] One group of positioning components is provided on the side form a5 and one group of positioning components are provided on the side form b10, and the two groups of positioning components are relatively distributed. The positioning components include a fixing frame 6, a push-pull button 7, a slide bar 8 and a positioning column 9. The two fixing frames 6 in the two groups of positioning components are respectively provided on the side form a5 and the side form b10, the push-pull button 7, the slide bar 8 and the positioning column 9 are connected in sequence, the slide bar 8 is slidably provided on the fixing frame 6, the cross-sectional dimensions of the push-pull button 7 and the positioning column 9 are both larger than the cross-sectional dimensions of the slide bar 8, and the slide bar 8 will not fall off the fixing frame 6. The size of the positioning column 9 is determined according to the size of the inner liner 1, and the positioning column 9 can be inserted into the inner side of the inner liner 1 and keep the inner liner 1 in a fixed position, so as to prevent the inner liner 1 from being offset and misaligned when the concrete is injected. After fixing the side mold a5 and the side mold b10 on the bottom mold 4, adjust the position of the inner liner tube 1 so that the two ends of the inner liner tube 1 are aligned with the two positioning columns 9 on both sides, and then push the push-pull button 7 inward, and the push-pull button 7 drives the positioning column 9 to move through the slide bar 8. The positioning column 9 is inserted into the inner side of the inner liner tube 1, and the positioning column 9 positions the inner liner tube 1. The distribution positions of multiple positioning columns 9 are determined in advance according to the style and specifications of the catheter to be produced. The ends of the positioning columns 9 can be designed with chamfers to improve the smoothness of the insertion process.

[0041] The top mold 14 is rotatably connected to the top of one side of the reinforcing rib 41, and the top mold 14 has a notch 141. A plurality of reinforcing ribs 41 are arranged side by side along the length direction on the outer peripheral surface of the bottom mold 4, and a rotating cylinder b15 is rotatably connected to the top of the other side of the reinforcing rib 41, and a bolt b16 is threadedly connected to the rotating cylinder b15. An anti-dropping platform b is provided at the end of the bolt b16 to prevent the bolt b16 from falling off the rotating cylinder b15. When fixing the top mold 14, the bolt b16 is rotated upward, the bolt b16 is rotated to the notch 141, and the bolt b16 is screwed downward, and the bolt b16 is pressed against the top mold 14 to complete the fixing of the top mold 14.

[0042] The top of the bottom mold 4 has a positioning platform 42, and the positioning platform 42 has a threaded hole. The end mold 17 has a positioning hole 171 for the positioning platform 42 to be inserted, and the positioning platform 42 is threadedly connected with a bolt c18 through the threaded hole, and the bolt c18 can be tightened on the end mold 17. The end mold 17 is designed to be a detachable structure. After the production of the concrete pipe is completed, the end mold 17 is removed so that the top of the bottom mold 4 is not blocked, so that the concrete pipe can be lifted upward and removed.

[0043] One end of the bottom mold 4, the side mold a5, one end of the top mold 14 and the end mold 17 are used to shape the socket end of the concrete column 3. The top mold 14 is designed with a pouring port 1401 at a position corresponding to the socket end of the concrete column 3. The other end of the bottom mold 4 and the side mold b10 are used to shape the socket end of the concrete column 3.

[0044] In this embodiment, the preparation method of the socket-type prefabricated concrete conduit for power cable comprises the following steps:

[0045] S1, opening the side mold a5, side mold b10, top mold 14 and end mold 17 in the preparation mold;

[0046] S1.1, spraying a release agent on the bottom mold 4, the side mold a5, the side mold b10, the top mold 14 and the end mold 17 to facilitate smooth demoulding after the concrete conduit is produced;

[0047] S2, placing a plurality of liner pipes 1 inside the stirrup frame 2, and placing the liner pipes 1 and the stirrup frame 2 into a U-shaped bottom mold 4 in the preparation mold;

[0048] S3, rotate the side mold a5 and the side mold b10, fix the side mold a5 with the bottom mold 4, fix the side mold b10 with the bottom mold 4, and before fixing, preliminarily align the inner liner tube 1 with the positioning column 9; insert the positioning column 9 at the side mold a5 and the positioning column 9 at the side mold b10 into the inner sides of both ends of the inner liner tube 1 respectively, and the chamfered ends of the positioning column 9 can assist the positioning column 9 to be inserted into the inner side of the inner liner tube 1. During the insertion of the positioning column 9, the inner liner tube 1 is slightly pushed until the positioning column 9 is inserted into the inner side of the inner liner tube 1 for accurate positioning; the two ends of the inner liner tube 1 are respectively abutted on the side mold a5 and the side mold b10, and the inner liner tube 1 is not completely clamped between the side mold a5 and the side mold b10;

[0049] S4, pouring concrete into the bottom mold 4, vibrating the concrete during pouring to make the concrete more compact, so that the concrete wraps the stirrup frame 2 and the inner liner pipe 1, and the concrete spreads to a position flush with the end of the inner liner pipe 1;

[0050] S5. When the top surface of the concrete is flush with the top surface of the bottom mold 4, rotate the top mold 14, cover the top of the bottom mold 4 and fix it, fix the end mold 17 on the bottom mold 4, and pour concrete from the pouring port 1401 of the top mold 14 until the concrete overflows to the bottom of the pouring port 1401;

[0051] S5.1. Carry out steam heating curing process to shorten the concrete hardening time (this step can also be omitted and natural curing method can be directly adopted);

[0052] S6. After the concrete solidifies into a concrete column 3, the positioning column 9 is moved out from the inner side of the inner liner tube 1, the side mold a5, the side mold b10, the top mold 14 and the end mold 17 are opened, and the prepared socket-type prefabricated concrete conduit for the power cable is removed. In the concrete conduit, the end face of one side of the inner liner tube 1 is flush with the inner end face of the socket of the concrete column 3, and the end face of the other side of the inner liner tube 1 is flush with the end face of the socket of the concrete column 3. When the concrete conduit is taken out of the preparation mold, the requirement of the end face of the inner liner tube 1 being flush is met, thereby ensuring the reliability of the integrated connection of the concrete conduit.

[0053] Furthermore, the end of the positioning column 9 is cone-shaped, and a heating device is added in the positioning column 9. When the positioning column 9 is inserted into the liner tube 1, the heating device transfers heat to the liner tube 1 through the positioning column 9. The positioning column 9 squeezes the liner tube 1, and the liner tube 1 is deformed by the heat, and the end is expanded. In the final finished concrete conduit, the two ends of the liner tube 1 are expanded, and the liner tube 1 is not easy to loosen from the concrete column 3, and the overall structure is more reliable.

[0054] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for preparing a socket-and-spigot type prefabricated concrete conduit for a power cable, characterized in that: The socket-type prefabricated concrete conduit for power cables includes: A stirrup frame (2) having a transversely penetrating installation channel, the stirrup frame (2) comprising a plurality of steel bars, steel rings and positioning ribs (21), a plurality of steel bars being arranged along the contour of the steel ring, a plurality of steel rings being arranged side by side along the length direction of the stirrup frame (2), the positioning ribs (21) being an upwardly protruding arc-shaped rod-shaped structure, the positioning ribs (21) being arranged on the steel rings and located on the inner side of the stirrup frame (2); An inner lining pipe (1), a plurality of which are arranged inside the installation channel, the inner lining pipe (1) comprising a main pipe and an auxiliary pipe, the diameter of the main pipe being larger than the diameter of the auxiliary pipe; A concrete column (3) wraps the inner lining pipe (1) and the stirrup frame (2) on the inner side, and has a socket and a spigot at both ends in the length direction, the socket and the spigot are adapted to each other, the inner end face of the socket is flush with the end face of the pipe opening at one end of the inner lining pipe (1), and the end face of the spigot is flush with the end face of the pipe opening at the other end of the inner lining pipe (1); The preparation method comprises the following steps: S1, opening the side mold a (5), the side mold b (10), the top mold (14) and the end mold (17) in the preparation mold; S2, placing a plurality of liner pipes (1) inside a stirrup rack (2), and placing the liner pipes (1) and the stirrup rack (2) into a U-shaped bottom mold (4) in the preparation mold; S3, rotating the side mold a (5) and the side mold b (10), fixing the side mold a (5) and the bottom mold (4), fixing the side mold b (10) and the bottom mold (4), inserting the positioning column (9) at the side mold a (5) and the positioning column (9) at the side mold b (10) into the inner sides of both ends of the lining tube (1), respectively, the two ends of the lining tube (1) are respectively abutted against the side mold a (5) and the side mold b (10), the end of the positioning column (9) is distributed in a cone shape, a heating device is added in the positioning column (9), when the positioning column (9) is inserted into the lining tube (1), the heating device transfers heat to the lining tube (1) through the positioning column (9), the positioning column (9) squeezes the lining tube (1), the lining tube (1) is deformed by the heat, and the end is expanded; S4, pouring concrete into the bottom form (4), so that the concrete wraps the stirrup frame (2) and the inner lining pipe (1); S5, when the top surface of the concrete is flush with the top surface of the bottom mold (4), the top mold (14) is rotated, the top mold (14) is covered on the top of the bottom mold (4) and fixed, the end mold (17) is fixed on the bottom mold (4), and concrete is poured from the pouring port (1401) of the top mold (14) until the concrete overflows to the bottom of the pouring port (1401); S6. After the concrete solidifies into a concrete column (3), the positioning column (9) is removed from the inner side of the inner liner (1), the side form a (5), the side form b (10), the top form (14) and the end form (17) are opened, and the obtained socket-type prefabricated concrete conduit for power cables is removed.

2. The method for preparing the socket-and-spigot type prefabricated concrete conduit for power cable according to claim 1, characterized in that: Between steps S1 and S2, a step of spraying a mold release agent on the bottom mold (4), the side mold a (5), the side mold b (10), the top mold (14) and the end mold (17) is added.

3. The method for preparing the socket-and-spigot type prefabricated concrete conduit for power cable according to claim 1, characterized in that: Between steps S5 and S6, a steam heating curing process is added to shorten the concrete curing time.

4. The method for preparing a socket-and-spigot type prefabricated concrete conduit for a power cable according to claim 1, characterized in that: Vibrate when pouring concrete.

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