Movable bottom die for lifting point of precast beam

Abstract

The utility model discloses a precast beam hoisting point movable bottom die which is composed of a steel bottom die and a hoisting point crossing structure, the steel bottom die is composed of a panel, a longitudinal beam, a cross beam and a grout stopping device, and the hoisting point crossing structure is composed of a movable panel, supporting angle steel, an end sealing steel plate and a fastening pull rod. The steel bottom die has the advantages that the steel bottom die is of an all-steel structure instead of a concrete base, can be repeatedly used, and is more energy-saving and environment-friendly; 2, the rubber pipe is adopted to stop grout, the elasticity is good, the position of the bottom die panel is not easily occupied, and the grout stopping effect is good; 3, the movable panel is tightly connected with the bottom die panel, so that the diseases such as slurry leakage, slab staggering and the like are not easy to generate; and 4, the vertex of the cross section of the supporting angle steel faces upwards, so that even if leaked slurry flows downwards at the joint of the movable panel, sediment accumulation cannot be generated on the supporting angle steel, cleaning is easy, it can be guaranteed that the movable panel is flush with the top surface of the bottom die panel for a long time, and the phenomenon of slab staggering is not likely to occur.

Description

Technical Field

[0001] The utility model relates to the field of bridge construction, in particular to a movable bottom formwork for a lifting point of a prefabricated beam. Background Art

[0002] After the precast beam is prefabricated on the base, it is usually lifted and transported to the beam storage area by passing a thick steel wire rope through the base. Since the traditional precast beam bottom formwork mostly adopts a concrete base plus a steel panel structure, before the prefabrication using the bottom lifting method, a steel plate placed on a support frame is generally used as a movable bottom formwork at the lifting point. However, since the concrete base is a rigid structure, it is difficult to effectively fix the movable bottom formwork and the precast beam bottom formwork during installation, and appearance defects such as leakage and misalignment often occur, which seriously affects the manufacturing quality of the precast beam. Summary of the invention

[0003] The utility model aims to provide a movable bottom mold which can be effectively connected with the bottom mold of the prefabricated beam and can ensure no leakage of mortar and no misalignment. The use of the movable bottom mold can greatly improve the manufacturing quality of the prefabricated beam.

[0004] The purpose of the utility model is achieved in this way:

[0005] A movable bottom formwork for lifting points of precast beams, characterized in that it is composed of a plurality of steel bottom forms and two cross-lifting point structures; the plurality of steel bottom forms are connected end to end and continuously placed in a straight line, and the cross-lifting point structure is used to be set at the lifting points at both ends of the bottom of the precast beam and between two adjacent steel bottom forms; wherein:

[0006] Each section of the steel bottom formwork is composed of a bottom formwork panel, longitudinal beams, cross beams and a grout-stopping device. The steel bottom formwork is a long strip segment, and is stacked from top to bottom. Specifically, longitudinal beams are evenly laid along the length direction under the horizontally placed bottom formwork panel, and a set of grout-stopping devices are fixed on both sides of the longitudinal beams, close to the bottom of the bottom formwork panel, and a number of cross beams are evenly distributed under the longitudinal beams, and the cross beams are arranged in the vertical direction of the longitudinal beams.

[0007] The longitudinal beams are located under the bottom mold panel, including side longitudinal beams and middle longitudinal beams; there are two side longitudinal beams, which are placed on the left and right sides of the bottom of the bottom mold panel respectively. Both side longitudinal beams are made of channel steel. The cross-section of the side longitudinal beams is placed upright and symmetrically, with the opening facing inward. The distance between the two side longitudinal beams and the edge of the bottom mold panel is 40mm, which is used to place the mortar stop device; the middle longitudinal beam is placed between the two side longitudinal beams;

[0008] The cross beams are placed upright, and several cross beams are evenly distributed under the longitudinal beams;

[0009] There are two sets of mortar-stopping devices, which are respectively located under the bottom mold panel and symmetrically distributed on both sides of the longitudinal beam, and are composed of a mortar-stopping seat, a rubber tube and a limit angle steel; the mortar-stopping seat is made of small channel steel, and the cross section of the mortar-stopping seat is placed upright, with the openings facing the outside of both sides respectively. The back of each set of mortar-stopping seats is close to and fixed on the back of a side longitudinal beam, the top surface of the mortar-stopping seat is flush with the side longitudinal beam, and the outer edge of the opening of the mortar-stopping seat is flush with the outer edge of the bottom mold panel; the mortar-stopping seat is attached to the side longitudinal beam and arranged longitudinally, and is disconnected at the hanging point, and the two adjacent ones at the hanging point are connected. A limiting angle steel is provided between the two stop mortar seats, one limb of the limiting angle steel is placed upright, a rectangular notch is cut off at each of the left and right ends of the upright limb, the length of the upright limb is the same as the length of the interval between two adjacent stop mortar seats at the hanging point, the two rectangular notches of the upright limb are respectively pressed against the outward ends of the two adjacent stop mortar seats, and the back of the upright limb is flush with the back of the small channel steel of the stop mortar seat; the two ends of the other limb of the limiting angle steel are placed horizontally in the openings of the two stop mortar seats; rubber tubes are placed in the openings of the stop mortar seats and on the horizontal limbs of the limiting angle steel;

[0010] The cross-hanging point structure consists of a movable panel, end steel plates, supporting angle steels and fastening tie rods, including:

[0011] The movable panel is placed on the supporting angle steel, and the top surface of the movable panel is flush with the top surface of the bottom mold panel;

[0012] Each span suspension point structure is equipped with two end-sealing steel plates, one on each side. Both end-sealing steel plates are located under the bottom formwork panel and are vertically fixed to the ends of the longitudinal beams. The lower side of the end-sealing steel plates is supported on the cross beams.

[0013] Each span suspension point structure is equipped with four supporting angle steels, two supporting angle steels are welded on each end steel plate, and the cross section of each supporting angle steel is arranged in a triangular shape, with the vertex of the triangle facing upwards. The vertex is located at the edge of the opening of the side longitudinal beam in the horizontal direction and below the movable panel in the vertical direction, so that after the movable panel is placed on the supporting angle steel, the top surface of the movable panel is just flush with the bottom mold panel of the steel bottom mold;

[0014] Each span suspension point structure is equipped with two tightening rods. Each tightening rod is located in the upper half of the beam, at a position L / 4 away from the end of the beam. L refers to the length of the beam. It is placed horizontally along the direction of the longitudinal beam. The two ends of the tightening rod pass through the two adjacent beams on both sides of the suspension point and are covered with spring washers. The nuts are screwed into the end of the tightening rod. The tightening rod and the nut are used together to connect and tighten the two adjacent beams on both sides of the suspension point.

[0015] The bottom formwork panel is made of 6mm steel plate in sections according to the bottom size of the precast beam, and its width is 5mm smaller than the bottom width of the precast beam.

[0016] The middle longitudinal beam is an I-beam, and the cross-sectional height of the middle longitudinal beam is the same as that of the side longitudinal beams. When the bottom of the beam is wider, the middle longitudinal beam uses multiple I-beams evenly distributed; when the bottom of the beam is narrower, only one middle longitudinal beam is used at the axial position of the steel bottom mold. The segment length of the longitudinal beam does not exceed 6m, and the height of the longitudinal beam is not less than 280mm.

[0017] The crossbeam is made of short I-beams. The distance between two crossbeams shall not exceed 2m. The length of each crossbeam is the width of the bottom formwork panel + 600mm, and the height shall not be less than 280mm.

[0018] The stop seat adopts [5 # The limit angle steel is made of L40mm equilateral angle steel, and the rubber tube is made of thick-walled smooth high-pressure explosion-proof and wear-resistant tube with strong elasticity, and the outer diameter is not less than 50mm.

[0019] The movable panel is made of thick steel plate processed by a shearing machine. The width of the movable panel is the same as that of the steel bottom mold bottom mold panel. The length of the movable surface is 250mm, and the material of the movable panel is the same as that of the bottom mold panel.

[0020] The length and width of the end-sealing steel plate are the same as the range enclosed by the longitudinal beam, and the thickness of the end-sealing steel plate is not less than 10mm.

[0021] The specification of the supporting angle steel is an equilateral angle steel of L50mm and a length of 40mm.

[0022] The tightening rod is made of high-quality rolled threaded steel with a specification of not less than 16mm, and a spring washer is used to prevent the nut from rotating.

[0023] The beneficial effects of the utility model are:

[0024] 1. The steel bottom formwork adopts a full steel structure to replace the concrete base, which can be reused many times and is more energy-saving and environmentally friendly;

[0025] 2. The rubber tube is used to stop the slurry, which has good elasticity and is not easy to occupy the position of the bottom mold panel, and the slurry stopping effect is better;

[0026] 3. The movable panel of the cross-hanging point structure is made of thickened steel plate, which is not easy to deform. Under the action of the tightening rod, it can be tightly connected with the bottom mold panel, and it is not easy to cause leakage, misalignment and other defects;

[0027] 4. The top of the supporting angle steel section faces upward. Even if there is leakage at the joint of the movable panel, no precipitation will be generated on the supporting angle steel. It is easy to clean and can ensure that the movable panel is flush with the top surface of the bottom mold panel for a long time, and it is not easy to cause misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the utility model;

[0029] Figure 2 This is a cross-sectional view of the utility model

[0030] Figure 3 Schematic diagram of the limiting angle steel used for the slurry stop device across the suspension point structure;

[0031] Figure 4 This is the connection diagram between the limit angle steel and the stop mortar seat;

[0032] Figure 5 for Figure 2 A partial enlarged schematic diagram of the structure across the suspension point;

[0033] In the figure: 1. Steel bottom formwork; 11. Bottom formwork panel; 12. Longitudinal beam; 121. Side longitudinal beam; 122. Middle longitudinal beam; 13. Cross beam; 14. Stop slurry device; 141. Stop slurry seat; 142. Rubber tube; 143. Limit angle steel; 144. Rectangular notch; 2. Span hanging point structure; 21. Movable panel; 22. End steel plate; 23. Support angle steel; 24. Fastening rod; 241. Nut. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

[0035] A movable bottom formwork for a prefabricated beam lifting point, comprising a plurality of steel bottom forms 1 and two spanning lifting point structures 2; the plurality of steel bottom forms 1 are connected end to end and continuously placed in a straight line, and at the lifting points at both ends of the bottom of the prefabricated beam, two adjacent steel bottom forms 1 are spaced 250 mm apart for setting the spanning lifting point structures 2; wherein:

[0036] Each section of the steel bottom mold 1 is composed of a bottom mold panel 11, a longitudinal beam 12, a transverse beam 13 and a slurry stopping device 14. The steel bottom mold 1 is a long strip segment, and the steel bottom mold 1 is composed of a stacked manner from top to bottom, specifically: the longitudinal beams 12 are evenly laid along the length direction under the horizontally placed bottom mold panel 11, and a set of slurry stopping devices 14 are fixed on both sides of the longitudinal beams 12 close to the bottom of the bottom mold panel 11, and a number of transverse beams 13 are evenly distributed under the longitudinal beams 12, and the transverse beams 13 are arranged in the vertical direction of the longitudinal beams 12.

[0037] The bottom formwork panel 11 is made of 6mm steel plate in sections according to the bottom size of the precast beam. The width is 5mm smaller than the bottom width of the precast beam. Ordinary steel plates are used for indoor prefabrication and stainless steel plates are used for outdoor prefabrication. The bottom formwork panel 11 is disconnected at the hanging point and replaced by a movable panel 21.

[0038] The longitudinal beam 12 is located under the bottom mold panel 11, including a side longitudinal beam 121 and a middle longitudinal beam 122; there are two side longitudinal beams 121, which are respectively placed on the left and right sides of the bottom of the bottom mold panel 11, and the two side longitudinal beams 121 are made of channel steel. The cross-sections of the side longitudinal beams 121 are upright and symmetrical, with the openings facing inward. The two side longitudinal beams 121 are each 40 mm away from the edge of the bottom mold panel 11, which is used to place the slurry stopping device 14; the middle longitudinal beam 122 is placed between the two side longitudinal beams 121, and the middle longitudinal beam 122 is an I-beam. The cross-sectional height of the middle longitudinal beam 122 is the same as the cross-sectional height used for the side longitudinal beams 121. When the bottom of the beam is wider, the middle longitudinal beam 122 uses multiple I-beams evenly distributed; when the bottom of the beam is narrow, only one middle longitudinal beam 122 is used at the axial position of the steel bottom mold 1, the segment length of the longitudinal beam 12 does not exceed 6m, and the height of the longitudinal beam 12 is not less than 280mm.

[0039] The cross beam 13 is made of short I-beams with an upright cross section. Several cross beams 13 are evenly distributed under the longitudinal beam 12. The distance between two cross beams 13 does not exceed 2m. The length of each cross beam 13 is the width of the bottom mold panel 11 + 600mm, and the height is not less than 280mm.

[0040] There are two sets of stop grout devices 14, which are respectively located under the bottom mold panel 11 and symmetrically distributed on both sides of the longitudinal beam 12. They are composed of a stop grout seat 141, a rubber tube 142 and a limit angle steel 143. The specification of the stop grout seat 141 adopts [5 # The small channel steel has a cross-section and is placed upright with its openings facing the outside on both sides. The back of each set of mortar stop seats 141 is close to and fixed on the back of a side longitudinal beam 121. The top surface of the mortar stop seat 141 is flush with the side longitudinal beam 121, and the outer edge of the opening of the mortar stop seat 141 is flush with the outer edge of the bottom mold panel 11. The mortar stop seat 141 is arranged longitudinally on the side longitudinal beam 121 and is disconnected at the hanging point. A limiting angle steel 143 is provided between two adjacent mortar stop seats 141 at the hanging point. The limiting angle steel 143 adopts an equilateral angle steel of L40mm. One limb of the limiting angle steel 143 is placed upright, and a rectangular notch 144 with a length of 50mm and a height of 40mm is cut off at the left and right ends of the upright limb. The length of the upright limb is the same as the length of the interval between two adjacent mortar stop seats 141 at the hanging point, the two rectangular notches 144 of the upright limb are respectively pressed against the outward ends of the two adjacent mortar stop seats 141, and the back of the upright limb is flush with the back of the small channel steel of the mortar stop seat 141; the two ends of the other limb of the limiting angle steel 143 are horizontally placed in the openings of the two mortar stop seats 141; rubber tubes 142 are placed in the openings of the mortar stop seats 141 and on the horizontal limbs of the limiting angle steel 143; the limiting angle steel 143 is placed after the rubber tube 142 is installed, and is used to provide force support to the rubber tube 142 at the hanging point; the rubber tube 142 adopts a thick-walled, smooth, high-pressure, explosion-proof and wear-resistant tube with strong elasticity, and the outer diameter is not less than 50mm.

[0041] The cross-hanging point structure 2 is composed of a movable panel 21, an end steel plate 22, a supporting angle steel 23 and a fastening tie rod 24, wherein:

[0042] The movable panel 21 is made of thick steel plate processed by a shearing machine. It has the same width as the bottom mold panel 11 of the steel bottom mold 1 and a length of 250 mm. It is placed on the supporting angle steel 23. The top surface of the movable panel 21 is flush with the top surface of the bottom mold panel 11, and the material of the movable panel 21 is the same as that of the bottom mold panel 11.

[0043] Each span suspension point structure 2 is provided with two end-sealing steel plates 22, one on each side. The two end-sealing steel plates 22 are both located under the bottom formwork panel 11, perpendicular to the longitudinal beam 12 and uprightly fixed on the end of the longitudinal beam 12. The lower side of the end-sealing steel plate 22 is supported on the cross beam 13. The length and width of the end-sealing steel plate 22 are the same as the range enclosed by the longitudinal beam 12, and the thickness of the end-sealing steel plate 22 is not less than 10 mm.

[0044] Each span suspension point structure 2 is provided with four supporting angle steels 23, and two supporting angle steels 23 are welded on each end sealing steel plate 22. The cross section of each supporting angle steel 23 is arranged in a triangular shape, with the apex of the triangle facing upward. The position of the apex is located at the edge of the opening of the side longitudinal beam 121 in the horizontal direction and below the movable panel 21 in the vertical direction, so that after the movable panel 21 is placed on the supporting angle steel 23, the top surface of the movable panel 21 is just flush with the bottom mold panel 11 of the steel bottom mold 1; the specification of the supporting angle steel 23 is an equilateral angle steel of L50mm and a length of 40mm.

[0045] Each span suspension point structure 2 is provided with two fastening rods 24, each fastening rod 24 is located at the upper half of the crossbeam 13, at a position L / 4 away from the end of the crossbeam 13, where L refers to the length of the crossbeam. It is placed horizontally along the direction of the longitudinal beam 121, and the two ends of the fastening rod 24 pass through the two adjacent crossbeams 13 on both sides of the suspension point respectively, and are covered with spring washers. The nut 241 is screwed into the end of the fastening rod 24, and the fastening rod 24 and the nut 241 are used together to connect and tighten the two adjacent crossbeams 13 on both sides of the suspension point; the fastening rod 24 is made of fine-rolled threaded steel with a specification of not less than 16mm, and a spring washer is used to prevent the nut 241 from rotating; after the movable panel 21 is installed in place, tighten the fastening rod 24 to ensure that the movable panel 21 and the bottom mold panel 11 are tightly fitted to avoid leakage of slurry at the joints, and remove the fastening rod 24 before the precast beam is tensioned to facilitate the next step of lifting and hoisting using the bottom-covering method.

[0046] It should be noted that: the principles and implementation methods of the utility model are described in this specification using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A movable bottom formwork for lifting points of prefabricated beams, characterized in that: It consists of several sections of steel bottom formwork and two span suspension point structures; several sections of steel bottom formwork are connected end to end and placed continuously in a straight line, and the span suspension point structure is set at the suspension points at both ends of the bottom of the precast beam and between two adjacent sections of steel bottom formwork; wherein: Each section of the steel bottom formwork is composed of a bottom formwork panel, longitudinal beams, cross beams and a grout-stopping device. The steel bottom formwork is a long strip segment, and is stacked from top to bottom. Specifically, longitudinal beams are evenly laid along the length direction under the horizontally placed bottom formwork panel, and a set of grout-stopping devices are fixed on both sides of the longitudinal beams, close to the bottom of the bottom formwork panel, and a number of cross beams are evenly distributed under the longitudinal beams, and the cross beams are arranged in the vertical direction of the longitudinal beams. The longitudinal beams are located under the bottom mold panel, including side longitudinal beams and middle longitudinal beams; there are two side longitudinal beams, which are placed on the left and right sides of the bottom of the bottom mold panel respectively. Both side longitudinal beams are made of channel steel. The cross-section of the side longitudinal beams is placed upright and symmetrically, with the opening facing inward. The distance between the two side longitudinal beams and the edge of the bottom mold panel is 40mm, which is used to place the mortar stop device; the middle longitudinal beam is placed between the two side longitudinal beams; The cross beams are placed upright, and several cross beams are evenly distributed under the longitudinal beams; There are two sets of mortar-stopping devices, which are respectively located under the bottom mold panel and symmetrically distributed on both sides of the longitudinal beam, and are composed of a mortar-stopping seat, a rubber tube and a limit angle steel; the mortar-stopping seat is made of small channel steel, and the cross section of the mortar-stopping seat is placed upright, with the openings facing the outside of both sides respectively. The back of each set of mortar-stopping seats is close to and fixed on the back of a side longitudinal beam, the top surface of the mortar-stopping seat is flush with the side longitudinal beam, and the outer edge of the opening of the mortar-stopping seat is flush with the outer edge of the bottom mold panel; the mortar-stopping seat is attached to the side longitudinal beam and arranged longitudinally, and is disconnected at the hanging point, and the two adjacent ones at the hanging point are connected. A limiting angle steel is provided between the two stop mortar seats, one limb of the limiting angle steel is placed upright, a rectangular notch is cut off at each of the left and right ends of the upright limb, the length of the upright limb is the same as the length of the interval between two adjacent stop mortar seats at the hanging point, the two rectangular notches of the upright limb are respectively pressed against the outward ends of the two adjacent stop mortar seats, and the back of the upright limb is flush with the back of the small channel steel of the stop mortar seat; the two ends of the other limb of the limiting angle steel are placed horizontally in the openings of the two stop mortar seats; rubber tubes are placed in the openings of the stop mortar seats and on the horizontal limbs of the limiting angle steel; The cross-hanging point structure consists of a movable panel, end steel plates, supporting angle steels and fastening tie rods, including: The movable panel is placed on the supporting angle steel, and the top surface of the movable panel is flush with the top surface of the bottom mold panel; Each span suspension point structure is equipped with two end-sealing steel plates, one on each side. Both end-sealing steel plates are located under the bottom formwork panel and are vertically fixed to the ends of the longitudinal beams. The lower side of the end-sealing steel plates is supported on the cross beams. Each span suspension point structure is equipped with four supporting angle steels, and two supporting angle steels are fixed on each end steel plate. The cross section of each supporting angle steel is arranged in a triangular shape, with the vertex of the triangle facing upwards. The vertex is located at the edge of the opening of the side longitudinal beam in the horizontal direction and below the movable panel in the vertical direction, so that after the movable panel is placed on the supporting angle steel, the top surface of the movable panel is just flush with the bottom mold panel of the steel bottom mold; Each span suspension point structure is equipped with two tightening rods. Each tightening rod is located in the upper half of the beam, at a position L / 4 away from the end of the beam, where L refers to the length of the beam. It is placed horizontally along the direction of the longitudinal beam. The two ends of the tightening rod pass through the two adjacent beams on both sides of the suspension point and are covered with spring washers. The nuts are screwed into the ends of the tightening rods. The tightening rods and the nuts are used together to connect and tighten the two adjacent beams on both sides of the suspension point.

2. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The bottom formwork panel is made of 6mm steel plate in sections according to the bottom size of the precast beam, and its width is 5mm smaller than the bottom width of the precast beam.

3. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The center longitudinal beam is made of I-beam, and the cross-sectional height of the center longitudinal beam is the same as that of the side longitudinal beams.

4. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The crossbeam is made of short I-beams. The distance between two crossbeams shall not exceed 2m. The length of each crossbeam is the width of the bottom formwork panel + 600mm, and the height shall not be less than 280mm.

5. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The stop seat adopts [5 # The limit angle steel is made of L40mm equilateral angle steel, and the rubber tube is made of thick-walled smooth high-pressure explosion-proof and wear-resistant tube with strong elasticity, and the outer diameter is not less than 50mm.

6. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The width of the movable panel is the same as that of the bottom mold panel of the steel bottom mold, the length of the movable surface is 250mm, and the material of the movable panel is the same as that of the bottom mold panel.

7. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The length and width of the end-sealing steel plate are the same as the range enclosed by the longitudinal beam, and the thickness of the end-sealing steel plate is not less than 10mm.

8. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The specification of the supporting angle steel is an equilateral angle steel of L50mm and a length of 40mm.

9. The movable bottom formwork for lifting points of prefabricated beams according to claim 1 is characterized in that: The tightening rod is made of precision-rolled threaded steel with a specification of not less than 16mm.

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