Large-span roof prestressed double-T slabs and their construction methods

Abstract

The present invention discloses a prestressed double-T slab for a large-span roof, comprising: a top plate and two rib plates. Embedded boxes are pre-buried at the wing flange parts outside the two rib plates of the top plate. One side surface of the embedded box is flush with the side surface of the wing flange part and is open; a spring is arranged in the embedded box of the right wing flange part of the top plate, and the spring expands and contracts along the width direction of the top plate. A through hole is arranged at the top of the embedded box, and a vertical embedded pipe is communicated above the through hole. The embedded pipe is also pre-buried in the top plate. A baffle plate is inserted into the embedded pipe, and the baffle plate presses against the spring to make the spring in a compressed state. The upper end of the baffle plate extends above the top of the embedded pipe. An insertion plate is also arranged in the embedded box of the right wing flange part of the top plate, and the insertion plate and the spring are separated by the baffle plate. The present invention avoids the problems in the prior art that when filling the splicing joint of the double-T slab, formwork suspension construction is required, mortar is used for caulking, and the dried mortar may fall from the splicing joint due to temperature change, injuring people or damaging equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of prestressed double T-plates, and more specifically, to a large-span prestressed double T-plate for roofing and a construction method thereof. Background Art

[0002] Prestressed double T-plate is a prefabricated reinforced concrete load-bearing member combined with plate and beam, which is composed of a wide panel and two narrow and high ribs. Its panel is both a transverse load-bearing structure and a compression zone for the longitudinal load-bearing ribs. The cross section of the compression zone is large, the neutral axis is close to or enters the plate surface, and the tensile main steel bar has a large force arm. Therefore, the prestressed double T-plate has good structural mechanical properties, a clear force transmission level, and a simple geometric shape. It is a load-bearing member that can be made into a large span, a large coverage area, and is relatively economical. However, the prestressed double T-plate also has its disadvantages. The gap between the plates of the double T-plate is difficult to handle. The gap between the plates of the double T-plate is in an inverted V shape. The plate gap is generally handled by a hanging mold, which is cumbersome to construct. At the same time, due to the inconsistent temperature deformation of adjacent plates, it is easy to cause the mortar in the joint to break and break into small pieces to fall and injure people or damage equipment. 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 large-span prestressed double T-plate for roof is provided, comprising: a top plate and two rib plates arranged on the lower plate surface of the top plate, two flanges of the top plate outside the two rib plates are pre-buried with dark boxes, the dark boxes are flat and long and arranged along the length direction of the top plate, and one side of the dark box is flush with the side of the flange and is open;

[0005] A spring is arranged in the dark box at the right flange of the top plate, and the spring is extended and retracted in the width direction of the top plate. A through hole is arranged on the top of the dark box, and a vertical dark tube is connected above the through hole. The dark tube is also pre-buried in the top plate, and the top of the dark tube is flush with the top surface of the top plate. A baffle is inserted in the dark tube, and the baffle presses the spring to compress the spring. The upper end of the baffle extends above the top of the dark tube. An insert plate is also arranged in the dark box at the right flange of the top plate, and the insert plate is in the shape of a long strip and its length matches the length of the dark box. The insert plate and the spring are separated by the baffle.

[0006] When two of the large-span roof prestressed double-T slabs are arranged side by side, the open surface of the concealed box at the right flange of the top plate of one large-span roof prestressed double-T slab faces the open surface of the concealed box at the left flange of the top plate of the other large-span roof prestressed double-T slab. And after the baffle in the concealed box at the right flange of the top plate of one large-span roof prestressed double-T slab is drawn out, the front end of the spring-driven plug board is inserted into the concealed box at the left flange of the top plate of the other large-span roof prestressed double-T slab.

[0007] Preferably, a stop post is arranged in the concealed box at the left flange of the top plate, and a bayonet corresponding to the position of the stop post is arranged at the front end of the plug board, so that when the front end of the plug board is inserted into the concealed box at the left flange of the top plate of the other large-span roof prestressed double-T slab, the stop post is stuck in the bayonet.

[0008] Preferably, a plurality of springs are arranged at uniform intervals in the length direction of the concealed box. The concealed pipe and the baffle corresponding to one spring are set as a group, and a plurality of groups of the concealed pipes and the baffles are also arranged correspondingly.

[0009] Preferably, a plurality of stop posts are arranged at uniform intervals in the length direction of the concealed box, and a plurality of bayonets corresponding to the plurality of stop posts are respectively arranged on the plug board.

[0010] Preferably, a distance is left between the end of the concealed box and the end of the top plate. Sliding grooves are arranged at both ends of the lower plate surface of the plug board along the length direction of the plug board. A sliding plate is slidably connected in the sliding grooves. The width of the sliding plate is adapted to the splicing seam generated by the side-by-side arrangement of the two large-span roof prestressed double-T slabs. After the sliding plate extends out of the sliding grooves, it can be flush with the end surface of the top plate.

[0011] Preferably, a hoisting groove is arranged on the top surface of the top plate, and a lifting ring is embedded in the hoisting groove.

[0012] The present invention also provides a construction method for the large-span roof prestressed double-T slab, including the following steps:

[0013] Step 1: Hoist the large-span roof prestressed double-T slab onto the bearing beam, and align the large-span roof prestressed double-T slab with the large-span roof prestressed double-T slab hoisted onto the bearing beam before, so that the open surface of the concealed box at the left flange of the top plate of the large-span roof prestressed double-T slab hoisted is aligned with the open surface of the concealed box at the right flange of the top plate of the large-span roof prestressed double-T slab hoisted onto the bearing beam before;

[0014] Step 2: Withdraw the baffle on the large-span roof prestressed double-T slab hoisted onto the bearing beam from the concealed pipe, so that the front end of the spring-driven plug board hoisted onto the large-span roof prestressed double-T slab on the bearing beam is inserted into the concealed box at the left flange of the top plate of the large-span roof prestressed double-T slab;

[0015] Step 3: Pour polyurethane foam on the plug board to fill the splicing joint between the large-span roof prestressed double-T slab hoisted onto the bearing beam previously and the large-span roof prestressed double-T slab to be hoisted, so that the polyurethane foam is flush with the top surface of the large-span roof prestressed double-T slab.

[0016] The present invention has at least the following beneficial effects: By pre-burying a concealed box with components such as springs, baffles, and plug boards on the large-span roof prestressed double-T slab, when constructing the large-span roof prestressed double-T slab, only by pulling out the baffle can the plug board be connected between the splicing joints of two large-span roof prestressed double-T slabs, forming a supporting plate for carrying the caulking material, avoiding the problem in the prior art that filling the splicing joint of double-T slabs requires formwork erection construction, with a cumbersome construction process and low efficiency. At the same time, due to the support of the plug board, it can also avoid the problem in the prior art that mortar is used for caulking, and the dried mortar may fall from the splicing joint due to temperature changes, injuring people or damaging equipment.

[0017] Other advantages, objectives, and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the large-span roof prestressed double-T slab in the width direction according to the embodiment of the present invention;

[0019] Figure 2 It is a schematic cross-sectional structure diagram of two adjacent large-span roof prestressed double-T slabs in the width direction during the construction of Step 1 in the construction method according to the embodiment of the present invention;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of two adjacent large-span roof prestressed double-T slabs in the width direction during the construction of Step 2 in the construction method according to the embodiment of the present invention;

[0021] Figure 4 It is a schematic top view structure diagram of two adjacent large-span roof prestressed double-T slabs in the horizontal plane during the construction of Step 1 in the construction method according to the embodiment of the present invention;

[0022] Figure 5 It is a schematic top view structure diagram of two adjacent large-span roof prestressed double-T slabs in the horizontal plane during the construction of Step 2 in the construction method according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] 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.

[0024] 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.

[0025] like Figures 1 to 5 As shown, the present invention provides a large-span prestressed double T-plate for roof, comprising: a top plate 1 and two rib plates 2 arranged on the lower plate surface of the top plate 1, two flanges of the top plate 1 outside the two rib plates 2 are pre-buried with dark boxes 3, the dark boxes 3 are flat and long and are arranged along the length direction of the top plate 1, and one side of the dark box 3 is flush with the side of the flange and is open;

[0026] The dark box 3 is fixed on the steel mesh of the large-span prestressed double T-plate for roofing, and the steel mesh is placed in a mold for casting the large-span prestressed double T-plate for roofing, and then concrete is poured in the mold, and the dark box 3 can be embedded in the large-span prestressed double T-plate for roofing after the concrete solidifies. The open surface of the dark box 3 can be pre-blocked with a wooden board, and the wooden board can be removed after the concrete solidifies.

[0027] A spring 4 is arranged in the dark box 3 at the right flange of the top plate 1, and the spring 4 is extended and retracted along the width direction of the top plate 1. A through hole is arranged at the top of the dark box 3, and a vertical dark tube 5 is connected above the through hole. The dark tube 5 is also pre-buried in the top plate 1 and the top of the dark tube 5 is flush with the top surface of the top plate 1. A baffle 6 is inserted in the dark tube 5, and the baffle 6 presses the spring 4 to make the spring 4 in a compressed state. The upper end of the baffle 6 extends above the top of the dark tube 5. An insert plate 7 is also arranged in the dark box 3 at the right flange of the top plate 1. The insert plate 7 is in the shape of a long strip and its length matches the length of the dark box 3. The insert plate 7 and the spring 4 are separated by the baffle 6;

[0028] When two of the large-span roof prestressed double-T slabs are arranged side by side, the open surface of the concealed box 3 at the right flange of the top plate 1 of one large-span roof prestressed double-T slab faces the open surface of the concealed box 3 at the left flange of the top plate 1 of the other large-span roof prestressed double-T slab. After the baffle 6 in the concealed box 3 at the right flange of the top plate 1 of one large-span roof prestressed double-T slab is withdrawn, the spring 4 drives the front end of the plug plate 7 to insert into the concealed box 3 at the left flange of the top plate 1 of the other large-span roof prestressed double-T slab.

[0029] The construction method of the large-span roof prestressed double-T slab in the above embodiment includes the following steps:

[0030] Step 1: Hoist the large-span roof prestressed double-T slab onto the bearing beam and align it with the large-span roof prestressed double-T slab hoisted onto the bearing beam previously, so that the open surface of the concealed box 3 at the left flange of the top plate 1 of the large-span roof prestressed double-T slab hoisted is aligned with the open surface of the concealed box 3 at the right flange of the top plate 1 of the large-span roof prestressed double-T slab hoisted onto the bearing beam previously.

[0031] Step 2: Withdraw the baffle 6 from the concealed pipe 5 on the large-span roof prestressed double-T slab hoisted onto the bearing beam previously, so that the spring 4 on the large-span roof prestressed double-T slab hoisted onto the bearing beam previously drives the front end of the plug plate 7 to insert into the concealed box 3 at the left flange of the top plate 1 of the large-span roof prestressed double-T slab.

[0032] Step 3: Pour polyurethane foam for filling the splicing joint between the large-span roof prestressed double-T slab hoisted onto the bearing beam previously and the large-span roof prestressed double-T slab hoisted on the plug plate 7, so that the polyurethane foam is flush with the top surface of the large-span roof prestressed double-T slab.

[0033] In the above embodiment, by embedding a concealed box 3 with components such as a spring 4, a baffle 6, and a plug plate 7 on the large-span roof prestressed double-T slab, when the large-span roof prestressed double-T slab is under construction, only by pulling out the baffle 6 can the plug plate 7 be connected between the splicing joints of the two large-span roof prestressed double-T slabs, forming a supporting plate for carrying the caulking material, avoiding the problems of cumbersome construction process and low efficiency in the prior art of filling the splicing joint of the double-T slab by using formwork suspension. At the same time, due to the support of the plug plate 7, it can also avoid the problems in the prior art of using mortar for caulking, where the dried mortar may fall from the splicing joint due to temperature changes, injuring people or damaging equipment.

[0034] In another embodiment, a stop post 8 is provided in the cassette 3 at the left flange portion of the top plate 1. A bayonet 9 corresponding to the position of the stop post 8 is provided at the front end of the insertion plate 7. When the front end of the insertion plate 7 is inserted into the cassette 3 at the left flange portion of the top plate 1 of another large-span roof prestressed double-T plate, the stop post 8 is stuck in the bayonet 9.

[0035] Here, an elastic rubber layer can be attached to the inner wall at the position of the bayonet 9. The shape of the bayonet 9 can be as Figure 4 shown. The distance at the entrance is slightly smaller than the diameter of the stop post 8. Of course, the elastic force of the spring 4 is sufficient to deform the rubber layer so that the stop post 8 slides into the interior of the bayonet 9. The inner arc of the bayonet 9 can be adapted to the outer wall of the stop post 8. When the stop post 8 is stuck in the bayonet 9, a connection relationship with a certain connection strength can be established between the insertion plate 7 and the stop post 8, preventing the insertion plate 7 from easily disengaging from the cassette 3 at the left flange portion of the top plate 1 of another large-span roof prestressed double-T plate.

[0036] In another embodiment, a plurality of springs 4 are evenly spaced in the length direction of the cassette 3. The dark tube 5 and the baffle 6 corresponding to one spring 4 are set as a group, and a plurality of groups of the dark tube 5 and the baffle 6 are also correspondingly provided.

[0037] Here, the plurality of springs 4 can have the same specifications and basically the same elastic coefficient. The compression degrees of the plurality of springs 4 in the cassette 3 are basically the same. When the baffle 6 is pulled out, the plurality of springs 4 pressing against the inner side surface of the insertion plate 7 can maintain basically the same thrust and moving speed, preventing the insertion plate 7 from being slightly inclined and stuck in the cassette 3 due to different thrusts. Using a plurality of springs 4 can evenly push the insertion plate 7 forward. At the same time, under the same compression degree, the plurality of springs 4 generate a greater thrust than a single spring 4, and the pushing effect on the insertion plate 7 is better.

[0038] In another embodiment, a plurality of stop posts 8 are evenly spaced in the length direction of the cassette 3, and a plurality of bayonets 9 corresponding to the plurality of stop posts 8 are respectively provided on the insertion plate 7. This enables a connection relationship to be generated between the insertion plate 7 on one large-span roof prestressed double-T plate and the plurality of stop posts 8 on another large-span roof prestressed double-T plate among adjacent large-span roof prestressed double-T plates, enhancing the connection strength and reducing the risk of the insertion plate 7 on one large-span roof prestressed double-T plate disengaging from the cassette 3 on another large-span roof prestressed double-T plate.

[0039] In another embodiment, there is a distance between the end of the cassette 3 and the end of the top plate 1. Both ends of the lower plate surface of the insertion plate 7 are provided with sliding grooves along the length direction of the insertion plate 7. A sliding plate 10 is slidably connected in the sliding grooves. The width of the sliding plate 10 is adapted to the splicing joint generated by arranging two large-span roof prestressed double-T slabs side by side. After the sliding plate 10 extends out of the sliding grooves, it can be flush with the end surface of the top plate 1.

[0040] In the above embodiment, since there is a distance between the end of the cassette 3 and the end of the top plate 1, the insertion plate 7 cannot completely cover the splicing joint between two adjacent large-span roof prestressed double-T slabs. The sliding plate 10 can just make up for this defect. When the front end of the insertion plate 7 on the large-span roof prestressed double-T slab hoisted onto the bearing beam is inserted into the cassette 3 in the left flange part of the top plate 1 of the large-span roof prestressed double-T slab to be hoisted later, the sliding plates 10 at both ends of the insertion plate 7 can slide out of the sliding grooves, so as to fill the gap between the end of the insertion plate 7 and the end of the top plate 1 and provide a supporting foundation for the caulking material.

[0041] In another embodiment, a hoisting groove is arranged on the top surface of the top plate 1, and a lifting ring is embedded in the hoisting groove. By arranging the lifting ring, the hoisting of the large-span roof prestressed double-T slab can be facilitated. Here, the position of the hoisting groove can be arranged above the rib plate 2, and the lifting ring can be fixed on the steel mesh of the large-span roof prestressed double-T slab. After the large-span roof prestressed double-T slab is hoisted onto the bearing beam, the hoisting groove can be filled with mortar to make the top surface of the large-span roof prestressed double-T slab flat.

[0042] Although the embodiments of the present invention have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A large-span prestressed double T-plate for roofing, comprising: A top plate and two ribs arranged on the lower surface of the top plate, characterized in that two flanges of the top plate outside the two ribs are pre-buried with dark boxes, the dark boxes are flat and long and arranged along the length direction of the top plate, and one side of the dark box is flush with the side of the flange and is open; A spring is arranged in the dark box at the right flange of the top plate, and the spring is extended and retracted in the width direction of the top plate. A through hole is arranged on the top of the dark box, and a vertical dark tube is connected above the through hole. The dark tube is also pre-buried in the top plate, and the top of the dark tube is flush with the top surface of the top plate. A baffle is inserted in the dark tube, and the baffle presses the spring to compress the spring. The upper end of the baffle extends above the top of the dark tube. An insert plate is also arranged in the dark box at the right flange of the top plate, and the insert plate is in the shape of a long strip and its length matches the length of the dark box. The insert plate and the spring are separated by the baffle. When the two large-span prestressed double T-plates for roofing are arranged side by side, the open surface of the dark box on the right side flange of the top plate of one large-span prestressed double T-plate for roofing faces the open surface of the dark box on the left side flange of the top plate of the other large-span prestressed double T-plate for roofing, and after the baffle in the dark box on the right side flange of the top plate of one large-span prestressed double T-plate for roofing is pulled out, the front end of the spring-driven plug plate is inserted into the dark box on the left side flange of the top plate of the other large-span prestressed double T-plate for roofing.

2. The large-span prestressed double T-plate for roofing according to claim 1, characterized in that: A stop column is arranged in the dark box on the left flange of the top plate, and a bayonet corresponding to the position of the stop column is arranged at the front end of the plug plate, so that when the front end of the plug plate is inserted into the dark box on the left flange of the top plate of another large-span prestressed double T-plate for roofing, the stop column is stuck in the bayonet.

3. The large-span prestressed double T-plate for roofing according to claim 1, characterized in that: A plurality of springs are evenly spaced in the length direction of the dark box, and the dark tube and the baffle corresponding to one spring are set as a group, and the dark tube and the baffle are also correspondingly provided in a plurality of groups.

4. The large-span prestressed double T-plate for roofing according to claim 2, characterized in that: A plurality of blocking posts are evenly spaced in the length direction of the dark box, and a plurality of bayonet holes are respectively arranged on the plug plate corresponding to the plurality of blocking posts.

5. The large-span prestressed double T-plate for roofing according to claim 1, characterized in that: A distance is left between the end of the dark box and the end of the top plate, and slide grooves are provided at both ends of the lower plate surface of the plug plate along the length direction of the plug plate. A slide plate is slidably connected in the slide groove, and the width of the slide plate is adapted to the joint seam produced by the side-by-side arrangement of two large-span prestressed double T-plates for the roof, and the slide plate can be flush with the end surface of the top plate after extending from the slide groove.

6. The large-span prestressed double T-plate for roofing according to claim 1, characterized in that: The top surface of the top plate is provided with a hoisting groove, and a hoisting ring is pre-buried in the hoisting groove.

7. The construction method of the large-span prestressed double T-plate for roofing according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, hoisting the large-span prestressed double T-plate on the load-bearing beam, and aligning the large-span prestressed double T-plate on the load-bearing beam with the large-span prestressed double T-plate on the load-bearing beam, so that the open surface of the dark box on the left flange of the top plate of the large-span prestressed double T-plate on the load-bearing beam is aligned with the open surface of the dark box on the right flange of the top plate of the large-span prestressed double T-plate on the load-bearing beam; Step 2: Pull out the baffle plate on the large-span prestressed double T-plate for roofing previously hoisted on the load-bearing beam from the concealed pipe, so that the front end of the spring-driven plug-in plate on the large-span prestressed double T-plate for roofing previously hoisted on the load-bearing beam is inserted into the concealed box on the left flange portion of the top plate of the large-span prestressed double T-plate for roofing; Step three, pouring polyurethane foam on the plug plate to fill the joint between the large-span roof prestressed double T-board previously hoisted to the load-bearing beam and the large-span roof prestressed double T-board hoisting, so that the polyurethane foam is flush with the top surface of the large-span roof prestressed double T-board.

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