Telescopic formwork for ditch cable trough cross arm

Abstract

The invention belongs to the technical field of cable trough construction, and particularly relates to a telescopic formwork for a ditch cable trough cross arm, the telescopic formwork comprises a pair of connecting steel plates and an adjusting rod, one connecting steel plate is in threaded connection with the adjusting rod, and the other connecting steel plate is rotationally connected with the adjusting rod; the top surface of the connecting steel plate is fixedly connected with a rectangular template, the rectangular template is provided with a group of cable arrangement frames, and the inner wall of the rectangular template is provided with a rectangular fixed template; by applying the telescopic formwork, the problem that the concrete surface of an existing ditch cross arm is uneven can be solved, the defects of bubbles, cracks and the like are reduced, compared with a traditional formwork, the designed rectangular formwork, the designed rectangular fixing formwork and the designed connecting steel plate of the supporting structure are firmer and more stable, it can be guaranteed that the shape and the size are accurate during concrete pouring, and the construction efficiency is improved. And the requirement of existing formwork construction for the proficiency of workers can be reduced, operation is convenient, and construction time is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of cable trough construction, in particular to a retractable template for a cross arm of a ditch cable trough. Background Art

[0002] In places such as tunnels or underground passages, in order to facilitate the installation and maintenance of cable systems, cable troughs are usually set up in places such as ditches to accommodate cables. In order to ensure the stability and load-bearing capacity of the cable trough, crossarms are required for support. The crossarms of tunnel cable troughs are used to span over the cable troughs to support and fix the cable troughs. The crossarms are usually made of reinforced concrete, located at the top of the cable troughs, and connected to the side walls of the cable troughs.

[0003] However, the above technology often has the following defects: in the current construction process, the cross arm is often poured with a combined formwork for concrete, which results in leakage, deformation of the cross arm, inaccurate positioning of the cross arm, etc. at the junction of the cross arm and the cable trough, affecting the stability and installation effect of the cable trough. For this reason, the present invention provides a retractable formwork for the cross arm of the ditch cable trough. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0005] The technical solution adopted by the present invention to solve its technical problem is: the retractable template for the cross arm of a ditch cable trough described in the present invention includes a pair of connecting steel plates and an adjusting rod, one of the connecting steel plates is threadedly connected to the adjusting rod, and the other connecting steel plate is rotatably connected to the adjusting rod; a rectangular template is fixedly connected to the top surface of the connecting steel plate, a group of cable arrangement frames are arranged on the rectangular template, and a rectangular fixed template is placed on the inner wall of the rectangular template.

[0006] Preferably, the top of the cable arrangement frame is fixedly connected to a connecting block, a rectangular groove is provided in the connecting block, a fixed block is movably connected in the rectangular groove, the bottom end of the fixed block is fixedly connected to a sliding rod, the surface of the sliding rod is slidably connected to a connecting column, the bottom surface of the connecting column is fixedly connected to the rectangular template, an elastic part is provided between the bottom surface of the sliding rod and the inner wall of the connecting column, and the top surface of the fixed block is fixedly connected to a rubber block.

[0007] Preferably, a pair of guide grooves are opened on the bottom surface of the connecting block, a slider is arranged in the guide groove, a suction cup is fixedly connected to the bottom surface of the slider, a pressure plate is fixedly connected to the surface of the slider, and a moving mechanism for driving the slider to move is arranged in the connecting block.

[0008] Preferably, the moving mechanism includes a slide groove opened in the connecting block and connected to the guide groove, the inner wall of the slide groove is sealingly and slidably connected with a push block, the bottom surface of the push block is in contact with the fixed block, the slider is sealingly and slidably connected to the inner wall of the guide groove, and a first spring is fixedly connected between the top surface of the slider and the inner wall of the guide groove.

[0009] Preferably, a circular ring is slidably connected to the surface of the slider, a connecting rod is provided on the side wall of the circular ring, an arc plate is provided at one end of the connecting rod away from the circular ring, and a plurality of groups of bristles are fixedly connected to the bottom surface of the arc plate.

[0010] Preferably, the interior of the arc plate is a hollow structure, the inner wall of the arc plate is provided with a group of air inlet holes connected with the interior thereof, a push plate is sealingly and slidably connected inside the arc plate, and a driving mechanism for moving the push plate upward is provided inside the arc plate.

[0011] Preferably, the driving mechanism includes a second spring fixedly connected to the top surface of the push plate, the other end of the second spring is fixedly connected to the inner wall of the arc plate, the interior of the connecting rod is a hollow structure, the interiors of the slider and the circular ring are both hollow structures, one end of the connecting rod is connected to the circular ring, and the other end is connected to the inner wall of the arc plate, a group of first connecting grooves are provided on the side wall of the slider, and a second connecting groove corresponding to the first connecting groove is provided on the inner side wall of the circular ring, the slider and the circular ring are sealed and slidably connected, and the side wall of the slider is provided with an exhaust hole higher than the first connecting groove.

[0012] Preferably, an elastic sheet is fixedly connected to the inner wall of the air inlet, and a plurality of shrinkage holes are formed on the elastic sheet.

[0013] Preferably, an insulating sleeve is provided at the edge of the rectangular fixed template, and a plurality of water outlet grooves are provided on the inner side of the rectangular fixed template.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention uses the retractable formwork in this application to solve the problem of uneven concrete surface of existing ditch crossarms and reduce the occurrence of defects such as bubbles and cracks. The designed rectangular formwork, rectangular fixed formwork and connecting steel plates of the supporting structure are stronger and more stable than traditional formworks, which can ensure the shape and size of concrete during pouring are accurate, and can reduce the demand for worker proficiency in existing formwork construction, facilitate operation, and save construction time.

[0016] 2. The present invention uses an elastic member to push the slide bar, so that the slide bar drives the fixed block to reset. At this time, the rubber block will contact the top surface of the rectangular groove. The friction between the rubber block and the rectangular groove can position the connecting block, thereby achieving the role of positioning the cable arrangement frame. Through the above mechanism, the position of the cable arrangement frame can be quickly adjusted, and the cable arrangement frame can be quickly fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 is a stereogram of the retractable template of the present invention;

[0019] Figure 2 is a front view of the cable arrangement frame of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the connecting block, the fixing block and the cable arrangement frame in the present invention;

[0021] Figure 4 is a cross-sectional view of a slider and a circular ring in the present invention;

[0022] Figure 5 yes Figure 4 A magnified image of point A;

[0023] Figure 6 It is a structural schematic diagram of the rectangular fixed template in the present invention.

[0024] In the figure: 1. rectangular template; 2. rectangular fixed template; 3. connecting steel plate; 4. adjusting rod; 5. cable arrangement frame; 6. connecting block; 7. fixing block; 8. rubber block; 9. connecting column; 10. sliding rod; 11. guide groove; 12. sliding block; 13. suction cup; 14. sliding groove; 15. pushing block; 16. circular ring; 17. connecting rod; 18. arc plate; 19. first connecting groove; 20. second connecting groove; 21. bristles; 22. pushing plate; 23. air inlet; 24. elastic sheet; 25. insulating sleeve; 26. water outlet groove; 27. pressing plate. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] Embodiment 1: Figures 1 to 5As shown, a retractable template for a cross arm of a ditch cable trough described in an embodiment of the present invention comprises a pair of connecting steel plates 3 and an adjusting rod 4, wherein one connecting steel plate 3 is threadedly connected to the adjusting rod 4, and the other connecting steel plate 3 is rotatably connected to the adjusting rod 4; a rectangular template 1 is fixedly connected to the top surface of the connecting steel plate 3, a group of cable arrangement frames 5 are arranged on the rectangular template 1, and a rectangular fixed template 2 is placed on the inner wall of the rectangular template 1; by placing the rectangular template 1 at the cross arm required for pouring the ditch cable trough, adjusting the adjusting rod 4 so that the rectangular template 1 is fixed to the inner side of the ditch cable trough, a cable arrangement frame 5 with adjustable spacing is arranged in the rectangular template 1, and then the rectangular fixed template 2 is placed in the middle of the pair of rectangular templates 1, and then concrete is poured to form a cross arm. The cable arrangement frame 5 is slidable inside the rectangular template 1 and can be fixed at any position. Before installation, the cable arrangement frame 5 can be adjusted according to the actual cable arrangement and the number of wire harnesses. The cable arrangement frame 5 is adjusted according to the specifications, and the spacing between several cable arrangement frames 5 is adjusted and fixed. The application of the retractable template in the present application can solve the problem of uneven concrete surface of the existing ditch crossarm, and reduce the occurrence of defects such as bubbles and cracks. The designed rectangular template 1, rectangular fixed template 2 and connecting steel plate 3 of the supporting structure are stronger and more stable than traditional templates, which can ensure the accurate shape and size of concrete pouring, and can reduce the demand for worker proficiency in existing template construction, facilitate operation, and save construction time.

[0027] The top of the cable arrangement frame 5 is fixedly connected with a connecting block 6, a rectangular groove is provided in the connecting block 6, a fixing block 7 is movably connected in the rectangular groove, a sliding rod 10 is fixedly connected to the bottom end of the fixing block 7, a connecting column 9 is slidably connected to the surface of the sliding rod 10, the bottom surface of the connecting column 9 is fixedly connected to the rectangular template 1, an elastic member is provided between the bottom surface of the sliding rod 10 and the inner wall of the connecting column 9, and a rubber block 8 is fixedly connected to the top surface of the fixing block 7; when the position of the cable arrangement frame 5 needs to be adjusted, the fixing block 7 is pressed downward so that the top surface of the rubber block 8 does not touch the rectangular template 1. The top surface of the rectangular groove can be in contact with the cable arrangement frame 5, and then the cable arrangement frame 5 can be pushed to allow the connecting block 6 to slide on the fixing block 7. After the cable arrangement frame 5 moves to a suitable position, the fixing block 7 is released. At this time, the elastic member will push the slide bar 10, so that the slide bar 10 drives the fixing block 7 to reset. At this time, the rubber block 8 will contact the top surface of the rectangular groove. The friction between the rubber block 8 and the rectangular groove can position the connecting block 6, thereby achieving the role of positioning the cable arrangement frame 5. Through the above mechanism, the position of the cable arrangement frame 5 can be quickly adjusted, and the cable arrangement frame 5 can be quickly fixed.

[0028] A pair of guide grooves 11 are provided on the inner bottom surface of the connecting block 6, a slider 12 is provided in the guide groove 11, a suction cup 13 is fixedly connected to the bottom surface of the slider 12, a pressure plate 27 is fixedly connected to the surface of the slider 12, and a moving mechanism for driving the slider 12 to move is provided in the connecting block 6; when arranging the cables, the suction cup 13 is avoided, and then after the cables are arranged, the slider 12 can be driven downward in the guide groove 11 with the help of the moving mechanism, at this time the slider 12 will drive the pressure plate 27 and the suction cup 13 to move downward, the pressure plate 27 will press the cable, so that the cable will not loosen, so as to improve the neatness of the cable arrangement, and at the same time the suction cup 13 will be sucked on the rectangular template 1, so that the pressure plate 27 can continue to press on the cable.

[0029] The moving mechanism includes a slide groove 14 opened in the connecting block 6 and connected to the guide groove 11, the inner wall of the slide groove 14 is sealed and slidably connected with a push block 15, the bottom surface of the push block 15 is in contact with the fixed block 7, the slider 12 is sealed and slidably connected to the inner wall of the guide groove 11, and a first spring is fixedly connected between the top surface of the slider 12 and the inner wall of the guide groove 11; when the suction cup 13 and the pressure plate 27 need to be pressed on the cable, the present application can use the force of the elastic member to push the slide rod 10, so that the slide rod 10 drives the fixed block 7 to move upward, and at this time the fixed block 7 will push the push block 15, so that the push block 15 pushes the gas in the slide groove 14 into the guide groove 11, and at this time the gas will push the slider 12 to move downward, thereby driving the pressure plate 27 to press on the cable, and at the same time driving the suction cup 13 to be adsorbed on the rectangular template 1.

[0030] The surface of the slider 12 is slidably connected to a ring 16, and a connecting rod 17 is provided on the side wall of the ring 16. An arc plate 18 is provided at one end of the connecting rod 17 away from the ring 16, and a plurality of groups of bristles 21 are fixedly connected to the bottom surface of the arc plate 18. In the present application, when the cable arrangement frame 5 moves, the bristles 21 can contact the rectangular template 1 as a group, and during the movement, the bristles 21 can sweep away the dust on the surface of the rectangular template 1 to prevent dust from being present in the place where the suction cup 13 is adsorbed, thereby affecting the adsorption effect of the suction cup 13.

[0031] The interior of the arc plate 18 is a hollow structure, and the inner wall of the arc plate 18 is provided with a group of air inlet holes 23 connected to the interior thereof. A push plate 22 is sealingly and slidably connected inside the arc plate 18, and a driving mechanism for moving the push plate 22 upward is provided inside the arc plate 18; after the cable arrangement frame 5 is moved to a suitable position, the push plate 22 can be driven upward by the driving mechanism, and at this time, the air inlet holes 23 will inhale gas, thereby sucking the dust under the suction cup 13 into the arc plate 18, so as to further improve the cleaning effect of the surface of the rectangular template 1 under the suction cup 13, so as to allow the suction cup 13 to be better adsorbed.

[0032] The driving mechanism includes a second spring fixedly connected to the top surface of the push plate 22, the other end of the second spring is fixedly connected to the inner wall of the arc plate 18, the interior of the connecting rod 17 is a hollow structure, the interiors of the slider 12 and the ring 16 are both hollow structures, one end of the connecting rod 17 is connected to the ring 16, and the other end is connected to the inner wall of the arc plate 18, the side wall of the slider 12 is provided with a group of first connecting grooves 19, the inner side wall of the ring 16 is provided with a second connecting groove 20 corresponding to the first connecting groove 19, and the slider 12 and the ring 16 are sealed and slided. The side wall of the slider 12 is provided with an exhaust hole which is higher than the first connecting groove 19; in the process of the slider 12 driving the suction cup 13 to move downward, the first connecting groove 19 on the slider 12 will move to the second connecting groove 20. At this time, the push plate 22 will move upward under the pull of the second spring, so that the gas in the arc plate 18 can enter the ring 16 through the connecting rod 17, and then enter the slider 12 from the first connecting groove 19 and the second connecting groove 20, and finally be discharged from the exhaust hole. At the same time, the air inlet 23 can be used for suction to suck dust into the arc plate 18.

[0033] The inner wall of the air inlet 23 is fixedly connected with an elastic sheet 24, and a plurality of shrinkage holes are formed on the elastic sheet 24; the air inlet 23 in the present application will expand the shrinkage holes on the elastic sheet 24 when taking in air, and then the dust will enter the arc plate 18 from the shrinkage holes, and then when the air inlet 23 stops taking in air, the shrinkage holes will be closed, and the dust will be sealed in the arc plate 18 to prevent the dust from floating out from the air inlet 23 to the bottom of the suction cup 13.

[0034] Embodiment 2: Figure 6 As shown, compared with Example 1, another implementation of the present invention is: an insulating sleeve 25 is provided at the edge of the rectangular fixed template 2, and a plurality of water outlet troughs 26 are provided on the inner side of the rectangular fixed template 2; an insulating rubber sleeve is provided at the edge of the rectangular fixed template 2 to prevent the cable from falling due to its own gravity after the cable is laid, causing the cable skin to rub against the edge of the rectangular fixed template 2, thereby affecting the life of the cable skin; a water outlet trough 26 is provided on the inner side of the rectangular fixed template 2, and in a rainy and humid environment, when there is water on the rectangular fixed template 2, the water can flow down quickly to avoid water accumulation.

[0035] Working principle: by placing the rectangular template 1 at the cross arm required for pouring the ditch cable trough, adjusting the adjusting rod 4 to fix the rectangular template 1 on the inner side of the ditch cable trough, a cable arrangement frame 5 with adjustable spacing is provided in the rectangular template 1, and then a rectangular fixed template 2 is placed in the middle of a pair of rectangular templates 1, and then concrete is poured to form a cross arm. The cable arrangement frame 5 can slide inside the rectangular template 1 and can be fixed at any position. Before installation, the cable arrangement frame 5 can be adjusted according to the actual cable arrangement situation and the number of wire harnesses, and the cable arrangement frame 5 is adjusted according to the specification requirements, and the spacing of several cable arrangement frames 5 is adjusted and fixed. The application of the retractable template in this application can solve the problem of uneven concrete surface of the existing ditch cross arm and reduce the occurrence of defects such as bubbles and cracks. The designed rectangular template 1, rectangular fixed template 2 and connecting steel plate 3 of the supporting structure are firmer and more stable than traditional templates, which can ensure the shape and size of concrete when pouring are accurate, and can reduce the demand for worker proficiency in existing template construction, facilitate operation, and save construction time;

[0036] When the position of the cable arrangement frame 5 needs to be adjusted, the fixing block 7 is pressed downward so that the top surface of the rubber block 8 does not contact the top surface of the rectangular groove. Then the cable arrangement frame 5 can be pushed to let the connecting block 6 slide on the fixing block 7. After the cable arrangement frame 5 moves to the appropriate position, the fixing block 7 is released. At this time, the elastic member will push the sliding rod 10, so that the sliding rod 10 drives the fixing block 7 to reset. At this time, the rubber block 8 will contact the top surface of the rectangular groove. The friction between the rubber block 8 and the rectangular groove can position the connecting block 6, thereby achieving the role of positioning the cable arrangement frame 5. Through the above mechanism, the position of the cable arrangement frame 5 can be quickly adjusted and the cable arrangement frame 5 can be quickly fixed. When arranging the cables, the present application avoids the suction cup 13, and then After the arrangement is completed, the slider 12 can be driven to move downward in the guide groove 11 with the help of the moving mechanism. At this time, the slider 12 will drive the pressure plate 27 and the suction cup 13 to move downward, and the pressure plate 27 will press the cable, so that the cable will not loosen, so as to improve the neatness of the cable arrangement. At the same time, the suction cup 13 will be sucked on the rectangular template 1, so that the pressure plate 27 can continue to press on the cable; when the suction cup 13 and the pressure plate 27 need to be pressed on the cable, the present application can use the force of the elastic member to push the slide bar 10, so that the slide bar 10 drives the fixed block 7 to move upward, and the fixed block 7 will push the push block 15, so that the push block 15 pushes the gas in the slide groove 14 into the guide groove 11, and the gas will push the slider 12 to move downward, thereby driving the pressure plate 27 to press on the cable, and at the same time driving the suction cup 13 to be adsorbed on the rectangular template 1;

[0037] In the present application, when the cable arrangement frame 5 moves, the bristles 21 can be in contact with the rectangular template 1 as a group. During the movement, the bristles 21 can sweep the dust on the surface of the rectangular template 1 to prevent dust from being present where the suction cup 13 is adsorbed, thereby affecting the adsorption effect of the suction cup 13; after the cable arrangement frame 5 is moved to a suitable position, the present application can drive the push plate 22 to move upward with the help of a driving mechanism. At this time, the air inlet 23 will inhale gas, thereby sucking the dust under the suction cup 13 into the arc plate 18, so as to further improve the cleaning effect of the surface of the rectangular template 1 under the suction cup 13, so that the suction cup 13 can be better adsorbed; in the present application, when the slider 12 drives the suction cup 13 to move downward, the slider 12 on the The first connecting groove 19 will move to the second connecting groove 20, at which time the push plate 22 will be pulled down and moved upward by the second spring, so that the gas in the arc plate 18 can enter the ring 16 through the connecting rod 17, and then enter the slider 12 from the first connecting groove 19 and the second connecting groove 20, and finally be discharged from the exhaust hole. At the same time, the air inlet hole 23 can inhale air and suck dust into the arc plate 18; the air inlet hole 23 in the present application will open the shrinkage hole on the elastic sheet 24 when taking in air, and at this time, dust will enter the arc plate 18 from the shrinkage hole, and then when the air inlet hole 23 stops taking in air, the shrinkage hole will be closed, and the dust will be sealed in the arc plate 18 to prevent dust from floating out from the air inlet hole 23 to the bottom of the suction cup 13.

[0038] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A retractable template for a cross arm of a ditch cable trough, comprising a pair of connecting steel plates (3) and an adjusting rod (4), wherein one connecting steel plate (3) is threadedly connected to the adjusting rod (4), and the other connecting steel plate (3) is rotatably connected to the adjusting rod (4); characterized in that: A rectangular template (1) is fixedly connected to the top surface of the connecting steel plate (3), a group of cable arrangement frames (5) are arranged on the rectangular template (1), and a rectangular fixed template (2) is placed on the inner wall of the rectangular template (1).

2. A retractable template for a cross arm of a ditch cable trough according to claim 1, characterized in that: The top of the cable arrangement frame (5) is fixedly connected to a connection block (6), a rectangular groove is provided in the connection block (6), a fixed block (7) is movably connected in the rectangular groove, a sliding rod (10) is fixedly connected to the bottom of the fixed block (7), a connecting column (9) is slidably connected to the surface of the sliding rod (10), the bottom surface of the connecting column (9) is fixedly connected to the rectangular template (1), an elastic member is provided between the bottom surface of the sliding rod (10) and the inner wall of the connecting column (9), and a rubber block (8) is fixedly connected to the top surface of the fixed block (7).

3. A retractable template for a cross arm of a ditch cable trough according to claim 2, characterized in that: A pair of guide grooves (11) are provided on the inner bottom surface of the connection block (6), a slider (12) is provided in the guide groove (11), a suction cup (13) is fixedly connected to the bottom surface of the slider (12), a pressure plate (27) is fixedly connected to the surface of the slider (12), and a moving mechanism for driving the slider (12) to move is provided in the connection block (6).

4. A retractable template for a cross arm of a ditch cable trough according to claim 3, characterized in that: The moving mechanism comprises a slide groove (14) provided in the connecting block (6) and connected to the guide groove (11); the inner wall of the slide groove (14) is sealed and slidably connected to a push block (15); the bottom surface of the push block (15) is in contact with the fixed block (7); the sliding block (12) is sealed and slidably connected to the inner wall of the guide groove (11); and a first spring is fixedly connected between the top surface of the sliding block (12) and the inner wall of the guide groove (11).

5. A retractable template for cross arms of a ditch cable trough according to claim 4, characterized in that: The surface of the slider (12) is slidably connected to a circular ring (16), a connecting rod (17) is provided on the side wall of the circular ring (16), an arc-shaped plate (18) is provided at one end of the connecting rod (17) away from the circular ring (16), and a plurality of groups of bristles (21) are fixedly connected to the bottom surface of the arc-shaped plate (18).

6. A retractable template for cross arms of a ditch cable trough according to claim 5, characterized in that: The interior of the arc plate (18) is a hollow structure, and the inner wall of the arc plate (18) is provided with a group of air inlet holes (23) connected to the interior thereof. The arc plate (18) is sealed and slidably connected with a push plate (22), and the arc plate (18) is provided with a driving mechanism for moving the push plate (22) upward.

7. A retractable template for cross arms of a ditch cable trough according to claim 6, characterized in that: The driving mechanism comprises a second spring fixedly connected to the top surface of the push plate (22), the other end of the second spring being fixedly connected to the inner wall of the arc plate (18), the interior of the connecting rod (17) being a hollow structure, the interiors of the slider (12) and the circular ring (16) being hollow structures, one end of the connecting rod (17) being connected to the circular ring (16), and the other end being connected to the inner wall of the arc plate (18), a group of first connecting grooves (19) being provided on the side wall of the slider (12), a second connecting groove (20) corresponding to the first connecting groove (19) being provided on the inner side wall of the circular ring (16), the slider (12) being sealed and slidably connected to the circular ring (16), and an exhaust hole higher than the first connecting groove (19) being provided on the side wall of the slider (12).

8. A retractable template for cross arms of a ditch cable trough according to claim 7, characterized in that: An elastic sheet (24) is fixedly connected to the inner wall of the air inlet hole (23), and a plurality of shrinkage holes are formed on the elastic sheet (24).

9. The retractable template for the cross arm of a ditch cable trough according to claim 1, characterized in that: An insulating sleeve (25) is sleeved on the edge of the rectangular fixed template (2), and a plurality of water outlet grooves (26) are arranged on the inner side of the rectangular fixed template (2).

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