Linear pre-tensioning prestress double-T-beam movable formwork configuration system and method

Abstract

The invention discloses a linear pre-tensioning prestress double-T-beam movable formwork configuration system and method.The linear pre-tensioning prestress double-T-beam movable formwork configuration system comprises a concrete fixing pedestal, a double-T-beam formwork assembly and tensioning assemblies, and the tensioning assemblies comprise the left side tensioning assembly, the right side tensioning assembly and a plurality of steel strands; the multiple steel strands are arranged in parallel and sequentially penetrate through the multiple double-T-beam formwork assemblies along the straight line, meanwhile, the two ends of the multiple steel strands are connected with the left side tensioning assembly and the right side tensioning assembly correspondingly for tensioning or releasing, the linear steel strands are completely adopted, tensioning construction is convenient, bending devices and the like are not used for the linear steel strands, accessory materials are saved, and the construction efficiency is improved. Meanwhile, stress concentration of the steel strands can be avoided, and construction is safer.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and particularly relates to a linear pretensioned prestressed double-T beam mobile formwork configuration system and method. Background Art

[0002] At present, the construction of double-T beams has many advantages. Its cross-sectional mechanical properties are good, it can bear large loads, and large-span and large-covered area components can be made; during construction, the number of components is small, reducing costs such as materials and labor, and the installation speed is fast, shortening the construction period; at the same time, compared with steel components, it has advantages such as fire resistance, corrosion resistance, maintenance-free, strong typhoon resistance and long service life.

[0003] The pretensioning method for double-T beam construction is to tension the prestressed tendons on the pedestal, then pour concrete, and release the tension after the concrete reaches a certain strength, relying on the bonding force for self-anchoring. Its construction is simple, the cost is low, the quality is stable and the production efficiency is high.

[0004] The defects existing in the existing double-T beam pretensioning method construction are as follows: (1) The broken-line type steel strand needs a bender. The pull plate type bender is prone to stress concentration bite marks on the steel strand, and the roller type bender is large in size, consumes a large amount of materials and has large frictional losses; (2) The vertical benders of the double-T beam need to be symmetrically arranged from the beam center. After the adjustment of different beam lengths, in order to ensure that the height position of the steel strand at the end position is consistent with the design, the middle bogie needs to be adjusted to different heights, increasing the process difficulty; (3) There will be a situation where the concrete pouring and vibration around the bender are not compact. The bender is close to the bottom plate, which is extremely likely to cause the concrete pouring to be not compact and the deflector to be exposed, resulting in quality defects; (4) The traditional double-T beam mobile pedestal is a post-tensioned double-T beam mobile pedestal, which adopts an integral structure. The formwork is anchored above the mobile trolley. The overall steel consumption of the mobile trolley is large, the volume is large, and the total height after adding the height of the mobile trolley and the formwork is about 1.8 - 2 m, which cannot meet the prefabrication requirements of the pretensioned double-T beam; (5) The traditional double-T beam formwork cannot lower the formwork at the beam bottom wedge block to release the residual stress, resulting in local concrete damage of the beam body.

[0005] The prestressed steel strands in the existing pretensioning method construction are generally in a broken-line type, the double-T beam formwork is generally fixed, and the formwork at the beam bottom wedge block cannot be lowered to release stress. Therefore, it is very promising to develop a mobile formwork configuration system applicable to the pretensioning method construction of double-T beams. Summary of the Invention

[0006] The purpose of the invention is to solve the problems of the existing technology, and provide a linear pretensioned prestressed double-T beam mobile formwork configuration system and method.

[0007] In order to solve the technical problems, the technical solution of the present invention is: a linear pre-tensioned double-T beam moving formwork configuration system, including a concrete fixed pedestal, a double-T beam formwork assembly, and a tensioning assembly. The tensioning assembly includes a left tensioning assembly, a right tensioning assembly, and several bundles of steel strands. The number of concrete fixed pedestals and double-T beam formwork assemblies is the same and is several. Each double-T beam formwork assembly is installed on the corresponding concrete fixed pedestal. Several concrete fixed pedestals are arranged in a row along the length direction. Several bundles of steel strands are arranged in parallel and sequentially pass through several double-T beam formwork assemblies in a straight line. At the same time, both ends of several bundles of steel strands are respectively connected to the left tensioning assembly and the right tensioning assembly for tensioning or relaxation; The concrete fixed pedestal is composed of a first area pedestal, a second area pedestal, and a third area pedestal that are connected in sequence. The number of second area pedestals is several, and the heights of the first area pedestal and the third area pedestal are both lower than the height of the second area pedestal; The double-T beam formwork assembly is composed of a first area formwork assembly, a second area formwork assembly, and a third area formwork assembly that are connected in sequence. The number of second area formwork assemblies is several. At the ends of the first area formwork assembly and the third area formwork assembly away from the second area formwork assembly, end formworks are respectively provided. The first area formwork assembly is correspondingly installed at the first area pedestal. Several second area formwork assemblies are correspondingly installed at several second area pedestals. The third area formwork assembly is correspondingly installed at the third area formwork assembly. Stress release members are provided at the bottoms of the first area formwork assembly and the third area formwork assembly; during tensioning and pouring, the stress release members play a role in lifting the first area formwork assembly and the third area formwork assembly to the same horizontal plane as the second area formwork assembly; during relaxation and arching, the stress release members are first removed separately to release the stress during arching.

[0008] Preferably, both the left tensioning assembly and the right tensioning assembly include a tensioning jack, a tensioning screw rod, a fastening nut, a reaction wall, and an anchoring trolley. One end of several bundles of steel strands is respectively anchored on the anchoring trolleys of the left tensioning assembly. The other ends of several bundles of steel strands are respectively anchored on the anchoring trolleys of the right tensioning assembly. One end of the tensioning screw rod is fixedly connected to the anchoring trolley. The other end of the tensioning screw rod passes through the reaction wall and is connected to the tensioning jack. The fastening nut is threadedly connected to the tensioning screw rod outside the reaction wall to lock the tensioning position of the steel strands; during tensioning, the piston of the tensioning jack extends, and several bundles of steel strands are tightened for tensioning. After tensioning to the designed degree, it is tightened by the fastening nut; during relaxation, the fastening nut is first loosened, and the piston of the tensioning jack is retracted, and several bundles of steel strands are relaxed to complete relaxation.

[0009] Preferably, the reaction wall includes a concrete support seat provided with a plurality of first tensioning screw rod holes, and the tensioning screw rod passes through the first tensioning screw rod holes to connect the tensioning jack.

[0010] Preferably, the anchoring trolley comprises an anchoring trolley body, a first steel strand hole, a second tensioning screw rod hole, an anchoring trolley roller and a track. A plurality of first steel strand holes and second tensioning screw rod holes are arranged on the anchoring trolley body. A plurality of steel strands respectively pass through the plurality of first steel strand holes and are fixed. One end of the tensioning screw rod passes through the second tensioning screw rod hole and is fixed. The bottom of the anchoring trolley body is provided with an anchoring trolley roller, and the anchoring trolley roller can slide along the track.

[0011] Preferably, the heights of the pedestal in Area 1 and the pedestal in Area 3 are the same, and the heights of the pedestal in Area 1 and the pedestal in Area 3 are lowered by 20 - 30 cm relative to the pedestal in Area 2.

[0012] Preferably, the formwork assembly in Area 2 comprises a first inner formwork sliding trolley, an integrated inner formwork, a comb plate, a top tie rod, an outer formwork, an outer formwork support frame, an outer formwork support screw rod, a limit plate, a leveling steel plate, embedded bolts, a bottom formwork fixing screw rod and a bottom tie rod. The integrated inner formwork is composed of an integrated inner formwork and a bottom formwork. A first inner formwork sliding trolley is arranged at the bottom of the integrated inner formwork. The first inner formwork sliding trolley is arranged on the leveling steel plate, and the leveling steel plate is arranged on the top of the pedestal in Area 2. Outer formworks are respectively installed on both sides of the bottom formwork of the integrated inner formwork. A comb plate is arranged at the top of the two outer formworks. The two outer formworks and the two comb plates are respectively supported by two outer formwork support frames. The bottoms of the two outer formwork support frames are respectively supported by two outer formwork support screw rods. The tops of the two outer formwork support frames are connected by a top tie rod, and the bottoms of the two outer formwork support frames are connected by a bottom tie rod. A limit plate is arranged at the contact position between the outer side of the bottom formwork of the integrated inner formwork and the pedestal in Area 2. Embedded bolts are respectively embedded on both sides of the width of the pedestal in Area 2. The embedded bolts are connected to the bottom formwork of the integrated inner formwork through the bottom formwork fixing screw rod to prevent the integrated inner formwork from being lifted together with the double T-beam when the beam is lifted.

[0013] Preferably, the formwork assembly in Area 1 comprises a first split inner formwork and a stress release member. The stress release member is a first roller and a second roller. The first split inner formwork is composed of a split inner formwork and a bottom formwork. The first roller and the second roller are respectively arranged at the bottoms of the inner formwork and the bottom formwork. The first roller and the second roller are arranged on the top of the pedestal in Area 1.

[0014] Preferably, the formwork assembly in Area 3 comprises a second split inner formwork and a stress release member. The stress release member is a bottom formwork support rod. The second split inner formwork is composed of a split inner formwork and a bottom formwork. A second roller is arranged at the bottom of the inner formwork, and a bottom formwork support rod is arranged at the bottom of the bottom formwork. The bottom formwork support rod and the second roller are both arranged on the top of the pedestal in Area 3.

[0015] Preferably, the end template includes an end template body and a steel strand trough box. A plurality of steel strand trough boxes are arranged on the end template body. A plurality of second steel strand holes are arranged on the steel strand trough box. Steel strands pass through the second steel strand holes. A stepped rubber plug is sleeved between the steel strands and the second steel strand holes. The stepped rubber plug is pressed by a pressing plate. A rubber strip groove is arranged at the edge of the end template body, and a rubber strip is arranged in the rubber strip groove.

[0016] Preferably, a configuration method for a linear pretensioned double-T beam moving formwork uses the above-mentioned configuration system for a linear pretensioned double-T beam moving formwork to precast double-T beams, including the following steps: Step 1: Install a number of concrete fixed pedestals and double-T beam formwork components in place according to the design positions of the linear production line. Pass a number of parallel steel strands through a number of double-T beam formwork components, and anchor the two ends to two anchoring trolleys at both ends of the linear production line respectively. The anchoring trolleys are connected to the tensioning jack through tensioning screws passing through the reaction wall. Step 2: Install the area one formwork component, area two formwork component, and area three formwork component of each double-T beam formwork component on the area one pedestal, area two pedestal, and area three pedestal respectively and tighten them. At the same time, stress release components are arranged at the bottoms of the area one formwork component and the area three formwork component. Step 3: Pour concrete into each double-T beam formwork component. Step 4: Remove the outer formwork of the double-T beam formwork component and cure it in the curing chamber. Step 5: Remove the stress release components at the bottoms of the area one formwork component and the area three formwork component. Slowly retract and relax the tensioning jack. When relaxing, the inner formwork and bottom formwork of the area one formwork component, area two formwork component, and area three formwork component slide along with the precast double-T beam. Step 6: Cut the steel strands at both ends of each precast double-T beam and remove the end template. Step 7: After taking out the precast double-T beam, restore the slid double-T beam formwork component to its original position and cycle to cast beams.

[0017] Compared with the prior art, the advantages of the present invention are as follows: (1) The present invention discloses a configuration system for a linear pretensioned double-T beam moving formwork, including a concrete fixed pedestal, a double-T beam formwork component, and a tensioning component. The tensioning component includes a left tensioning component, a right tensioning component, and a number of steel strands. The number of steel strands are arranged in parallel and sequentially pass through a number of double-T beam formwork components along a straight line. At the same time, both ends of the number of steel strands are respectively connected to the left tensioning component and the right tensioning component for tensioning or relaxation. The present invention uses all straight steel strands, which is convenient for tensioning construction. The straight steel strands do not use bending devices, etc., saving fitting materials. At the same time, stress concentration of the steel strands can be avoided, and the construction is safer. (2) The concrete fixed pedestal and the double-T beam formwork assembly of the present invention are arranged in regions. The heights of the pedestal in Region 1 and the pedestal in Region 3 of the concrete fixed pedestal are both lower than the height of the pedestal in Region 2. Stress release members are provided at the bottoms of the formwork assembly in Region 1 and the formwork assembly in Region 3 of the double-T beam formwork assembly. During tensioning and pouring, the stress release members play a role in lifting the formwork assembly in Region 1 and the formwork assembly in Region 3 to the same horizontal plane as the formwork assembly in Region 2. During relaxation and arching, the stress release members are removed separately first to release the stress during arching, ensuring that the beam body of the double-T beam is not damaged. (3) The concrete fixed pedestal and the double-T beam formwork assembly of the present invention are arranged in regions. Therefore, independent settings can be made for precast positive and negative slope beams, skewed beams, or the formwork for the end regions that need to be replaced when adjusting the beam length. It is more convenient to disassemble and assemble the formwork. (4) The double-T beam formwork assembly of the present invention is provided with an internal formwork sliding trolley inside the internal formwork. Compared with setting an overall vehicle frame, it uses less steel and has a smaller volume, facilitating formwork flipping and disassembly. (5) The present invention does not set a steering device, increasing the protective layer, making the concrete pouring and vibration more in place, and greatly reducing quality defects. (6) After adding the height of the concrete fixed pedestal and the height of the double-T beam formwork assembly, the total height is within the height range convenient for the construction team. The height of the reaction wall matches it, facilitating the construction team to carry out operations such as steel bar threading, steel strand anchoring, and steel strand tensioning, improving the beam manufacturing efficiency. Brief Description of the Drawings

[0018] Figure 1 Top view structural schematic diagram of a linear pretensioned double-T beam mobile formwork configuration system of the present invention; Figure 2 Partial enlarged view of a linear pretensioned double-T beam mobile formwork configuration system of the present invention; Figure 3 Structural schematic diagram of the reaction wall of the present invention; Figure 4 Structural schematic diagram of the anchoring trolley of the present invention; Figure 5 Structural schematic diagram of a single concrete fixed pedestal of the present invention; Figure 6 Cross-sectional structural schematic diagram of the formwork assembly in Region 2 of the present invention; Figure 7 Cross-sectional structural schematic diagram of the formwork assembly in Region 1 of the present invention; Figure 8 Cross-sectional structural schematic diagram of the formwork assembly in Region 3 of the present invention; Figure 9 Structural schematic diagram of the end formwork of the present invention; Figure 10, Schematic installation structure diagram of the stepped rubber plug of the present invention.

[0019] Explanation of reference numerals in the drawings: 1, Tensioning jack; 2, Tensioning screw rod; 3, Fastening nut; 4, Reaction wall; 5, Anchoring trolley; 6, Concrete fixed pedestal; 7, Double T-beam formwork assembly; 8, Steel strand. 4-1, Concrete bearing; 4-2, First tensioning screw rod hole. 5-1, Body of the anchoring trolley; 5-2, First steel strand hole; 5-3, Second tensioning screw rod hole; 5-4, Roller of the anchoring trolley; 5-5, Track. 6-1, Region 1 pedestal; 6-2, Region 2 pedestal; 6-3, Region 3 pedestal. 7-1, Region 1 formwork assembly; 7-2, Region 2 formwork assembly; 7-3, Region 3 formwork assembly; 7-4, End formwork. 7-1-1, First split-type inner formwork; 7-1-2, First roller; 7-1-3, Second roller. 7-2-1, First inner formwork sliding trolley; 7-2-2, Integrated inner formwork; 7-2-3, Comb plate; 7-2-4, Top tie rod; 7-2-5, Outer formwork; 7-2-6, Outer formwork support frame; 7-2-7, Outer formwork support screw rod; 7-2-8, Limiting plate; 7-2-9, Leveling steel plate; 7-2-10, Embedded bolt; 7-2-11, Bottom formwork fixing screw rod; 7-2-12, Bottom tie rod. 7-3-1, Second split-type inner formwork; 7-3-2, Bottom formwork strut; 7-3-3, Third roller. 7-4-1, End formwork body; 7-4-2, Steel strand trough box; 7-4-3, Second steel strand hole; 7-4-4, Stepped rubber plug; 7-4-5, Pressure plate; 7-4-6, Rubber strip groove. Detailed implementation manners

[0020] The following describes the detailed implementation manners of the present invention in conjunction with embodiments: It should be noted that the structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0021] Embodiment 1 As Figure 1 , 2As shown in the figure, the present invention discloses a linear pre-tensioned double-T beam moving formwork configuration system, which includes a concrete fixed pedestal 6, a double-T beam formwork assembly 7 and a tensioning assembly. The tensioning assembly includes a left tensioning assembly, a right tensioning assembly and steel strands 8. There are several bundles of steel strands 8. The number of concrete fixed pedestals 6 is the same as that of the double-T beam formwork assemblies 7, and there are several of them. Each double-T beam formwork assembly 7 is installed on the corresponding concrete fixed pedestal 6. Several concrete fixed pedestals 6 are arranged in a row along the length direction. Several bundles of steel strands 8 are arranged in parallel and sequentially pass through several double-T beam formwork assemblies 7. At the same time, both ends of several bundles of steel strands 8 are respectively connected to the left tensioning assembly and the right tensioning assembly for tensioning or relaxation; The concrete fixed pedestal 6 is composed of a zone one pedestal 6-1, a zone two pedestal 6-2 and a zone three pedestal 6-3 that are connected in sequence. There are several zone two pedestals 6-2, and the heights of both the zone one pedestal 6-1 and the zone three pedestal 6-3 are lower than the height of the zone two pedestal 6-2; The double-T beam formwork assembly 7 is composed of a zone one formwork assembly 7-1, a zone two formwork assembly 7-2 and a zone three formwork assembly 7-3 that are connected in sequence. There are several zone two formwork assemblies 7-2. At the ends of the zone one formwork assembly 7-1 and the zone three formwork assembly 7-3 away from the zone two formwork assembly 7-2, end formworks 7-4 are respectively provided. The zone one formwork assembly 7-1 is correspondingly installed at the zone one pedestal 6-1. Several zone two formwork assemblies 7-2 are correspondingly installed at several zone two pedestals 6-2. The zone three formwork assembly 7-3 is correspondingly installed at the zone three formwork assembly 7-3. Stress release members are provided at the bottoms of both the zone one formwork assembly 7-1 and the zone three formwork assembly 7-3; during tensioning and pouring, the stress release members play a role in lifting the zone one formwork assembly 7-1 and the zone three formwork assembly 7-3 to the same horizontal plane as the zone two formwork assembly 7-2; during relaxation and arching, the stress release members are removed separately first to release the stress during arching.

[0022] Embodiment 2 As Figure 1 、 2 As shown in the figure, preferably, both the left tensioning assembly and the right tensioning assembly include a tensioning jack 1, a tensioning screw rod 2, a fastening nut 3, a reaction wall 4 and an anchoring trolley 5. One ends of several bundles of steel strands 8 are respectively anchored on the anchoring trolleys 5 of the left tensioning assembly. The other ends of several bundles of steel strands 8 are respectively anchored on the anchoring trolleys 5 of the right tensioning assembly. One end of the tensioning screw rod 2 is fixedly connected to the anchoring trolley 5, and the other end of the tensioning screw rod 2 passes through the reaction wall 4 and is connected to the tensioning jack 1. When the piston of the tensioning jack 1 extends, several bundles of steel strands 8 are tightened for tensioning. When the piston of the tensioning jack 1 retracts, several bundles of steel strands 8 are relaxed to complete relaxation; the fastening nut 3 is threadedly connected to the tensioning screw rod 2 outside the reaction wall 4 to lock the tensioning position of the steel strands 8.

[0023] The present invention designs a production line for integral tensioning of a five - group double - T beam formwork assembly 7. A plurality of steel strands 8 are converged on one side of an anchoring trolley 5. The anchoring trolley 5 is simultaneously connected to a tensioning screw rod 2. The tensioning screw rod 2 passes through a reaction wall 4 and is connected to a tensioning jack 1. The movable end of the tensioning jack 1 is placed outside the reaction wall 4. When the piston of the tensioning jack 1 extends, the steel strands 8 are tightened for tensioning. When the piston of the tensioning jack 1 retracts, the steel strands 8 are relaxed to complete the relaxation of tension.

[0024] Example 3 As Figure 3 shown, preferably, the reaction wall 4 includes a concrete support 4 - 1 provided with a plurality of first tensioning screw rod holes 4 - 2. The tensioning screw rod 2 passes through the first tensioning screw rod holes 4 - 2 and is connected to the tensioning jack 1.

[0025] As Figure 4 shown, preferably, the anchoring trolley 5 includes an anchoring trolley body 5 - 1, a first steel strand hole 5 - 2, a second tensioning screw rod hole 5 - 3, anchoring trolley rollers 5 - 4 and a track 5 - 5. A plurality of first steel strand holes 5 - 2 and second tensioning screw rod holes 5 - 3 are provided on the anchoring trolley body 5 - 1. A plurality of steel strands 8 respectively pass through the plurality of first steel strand holes 5 - 2 and are fixed. One end of the tensioning screw rod 2 passes through the second tensioning screw rod hole 5 - 3 and is fixed. The bottom of the anchoring trolley body 5 - 1 is provided with anchoring trolley rollers 5 - 4, and the anchoring trolley rollers 5 - 4 can slide along the track 5 - 5.

[0026] Example 4 As Figure 5 shown, preferably, the heights of the pedestal 6 - 1 in area one and the pedestal 6 - 3 in area three are the same, and the heights of the pedestal 6 - 1 in area one and the pedestal 6 - 3 in area three are lowered by 20 - 30 cm relative to the pedestal 6 - 2 in area two.

[0027] Due to the formwork removal height requirement of the double - T beam formwork assembly 7 and for the convenience of construction by the work team, the internal form needs to be lifted to a certain height. Therefore, the present invention sets a concrete pedestal 6 under the internal form and pours it. Considering the arching of the beam during the relaxation of the double - T beam, the wedge - shaped block box at the beam end needs to release stress. Therefore, the box is set to be detachable, and the embedded steel plate box is removed before relaxation. To reserve the space required for the removal of the box, the concrete pedestal 6 is divided into three areas for pouring respectively. The pedestal 6 - 2 in area two is set as a pedestal with a standard height, and the pedestal heights of the pedestal 6 - 1 in area one and the pedestal 6 - 3 in area three are lowered by 20 cm before pouring.

[0028] Example 5 As Figure 6As shown in the figure, preferably, the template assembly 7-2 of the second region includes a first inner mold sliding trolley 7-2-1, an integrated inner mold 7-2-2, a comb plate 7-2-3, a top tie rod 7-2-4, an outer mold 7-2-5, an outer mold support frame 7-2-6, an outer mold support screw rod 7-2-7, a limit plate 7-2-8, a leveling steel plate 7-2-9, embedded bolts 7-2-10, a bottom mold fixing screw rod 7-2-11, and a bottom tie rod 7-2-12. The integrated inner mold 7-2-2 is composed of an integrated inner mold and a bottom mold. A first inner mold sliding trolley 7-2-1 is arranged at the bottom of the integrated inner mold 7-2-2. The first inner mold sliding trolley 7-2-1 is arranged on the leveling steel plate 7-2-9. The leveling steel plate 7-2-9 is arranged on the top of the pedestal 6-2 of the second region. Outer molds 7-2-5 are respectively installed on both sides of the bottom mold of the integrated inner mold 7-2-2. A comb plate 7-2-3 is arranged at the top of the two outer molds 7-2-5. The two outer molds 7-2-5 and the two comb plates 7-2-3 are respectively supported by two outer mold support frames 7-2-6. The bottoms of the two outer mold support frames 7-2-6 are respectively supported by two outer mold support screw rods 7-2-7. The tops of the two outer mold support frames 7-2-6 are connected by a top tie rod 7-2-4. The bottoms of the two outer mold support frames 7-2-6 are connected by a bottom tie rod 7-2-12. A limit plate 7-2-8 is arranged at the contact position between the outer side of the bottom mold of the integrated inner mold 7-2-2 and the pedestal 6-2 of the second region. Embedded bolts 7-2-10 are respectively embedded on both sides of the width of the pedestal 6-2 of the second region. The embedded bolts 7-2-10 are connected to the bottom mold of the integrated inner mold 7-2-2 through the bottom mold fixing screw rod 7-2-11 to prevent the integrated inner mold 7-2-2 from being lifted with the double T-beam when lifting the beam.

[0029] The double T-beam template assembly 7 includes an end template, an inner mold, a bottom mold, an outer mold, etc. The beam body has a positive slope and a reverse slope. For the convenience of construction, the high and low side directions of the production line are fixed. By swapping the template assembly 7-1 of the first region with the template assembly 7-3 of the third region, the prefabrication of the positive and reverse slope beams is realized. Therefore, the template is divided into three regions. The template assembly 7-2 of the second region is used as the standard section of the template. The inner mold and the bottom mold are set as a whole. The integral inner mold is supported by the inner mold sliding trolley. The rollers of the vehicle frame are leveled by laying the leveling steel plate 7-2-9 according to the requirements of the camber. The steel plates are padded under the bottom mold to ensure the stability of the template. The lateral displacement of the template is restricted by welding the limit plate 7-2-8 on the side of the concrete. When tensioning is released, the outer mold support frame 7-2-6 is removed, and the inner mold slides along with the movement of the beam body to release the stress without damaging the template.

[0030] Embodiment 6 As Figure 7As shown, preferably, the template assembly 7-1 in Region 1 includes a first split inner mold 7-1-1 and a stress release member. The stress release member is a first roller 7-1-2 and a second roller 7-1-3. The first split inner mold 7-1-1 is composed of a split inner mold and a bottom mold. The first roller 7-1-2 and the second roller 7-1-3 are respectively arranged at the bottoms of the inner mold and the bottom mold. The first roller 7-1-2 and the second roller 7-1-3 are arranged on the top of the pedestal 6-1 in Region 1.

[0031] As Figure 8 shown, preferably, the template assembly 7-3 in Region 3 includes a second split inner mold 7-3-1 and a stress release member. The stress release member is a bottom mold strut 7-3-2. The second split inner mold 7-3-1 is composed of a split inner mold and a bottom mold. A third roller 7-3-3 is arranged at the bottom of the inner mold, and a bottom mold strut 7-3-2 is arranged at the bottom of the bottom mold. The bottom mold strut 7-3-2 and the third roller 7-3-3 are both arranged on the top of the pedestal 6-3 in Region 3.

[0032] As Figures 6 - 8 shown, except for the split inner mold and the stress release member, the other components of the template assembly 7-1 in Region 1 and the template assembly 7-3 in Region 3 of the present invention are basically the same as those of the template assembly 7-2 in Region 2.

[0033] The inner mold and the bottom mold of the template assembly 7-1 in Region 1 and the template assembly 7-3 in Region 3 are separately arranged. The two regional templates of the template assembly 7-1 in Region 1 and the template assembly 7-3 in Region 3 can be interchanged to meet the requirements of fabricating beams with positive and negative slopes. Since the concrete pedestals of the pedestal 6-1 in Region 1 and the pedestal 6-3 in Region 3 are lowered in height, it is impossible to pad steel plates to ensure the stability of the template. Therefore, first rollers 7-1-2 are arranged under both the inner mold and the bottom mold of the template assembly 7-1 in Region 1. Since there is a double support trough box at the bottom mold of the template assembly 7-3 in Region 3 and the formwork needs to be removed downward, a third roller 7-3-3 is arranged under the inner mold of the template assembly 7-3 in Region 3, and a bottom mold strut 7-3-2 is arranged under the bottom mold. Levelling steel plates are arranged on both the pedestal 6-1 in Region 1 and the pedestal 6-3 in Region 3 for levelling, which not only ensures the stability of the template but also facilitates the sliding of the template along with the beam body. In addition, since the inner mold and the bottom mold of the template assembly 7-1 in Region 1 and the template assembly 7-3 in Region 3 are separately arranged, when prefabricating double T-beams with different beam lengths, the beam length requirements can be met by separately adding inner mold / bottom mold adjustment blocks.

[0034] Example 7 As Figure 9 , 10As shown in the figure, preferably, the end template 7-4 includes an end template body 7-4-1 and a strand chute box 7-4-2. A plurality of strand chute boxes 7-4-2 are provided on the end template body 7-4-1. A plurality of second strand holes 7-4-3 are provided on the strand chute box 7-4-2. The strand 8 passes through the second strand holes 7-4-3. A stepped rubber plug 7-4-4 is sleeved between the strand 8 and the second strand holes 7-4-3. The stepped rubber plug 7-4-4 is pressed tightly by a pressing plate 7-4-5. A rubber strip groove 7-4-6 is provided at the edge of the end template body 7-4-1, and a rubber strip is provided in the rubber strip groove 7-4-6.

[0035] A rubber strip groove 7-4-6 is provided around the end template body 7-4-1 in contact with the inner and outer molds to place a sealing rubber strip. A stepped rubber plug 7-4-4 is placed at the position of the second strand holes 7-4-3 and fixed with a pressing plate 7-4-5 to minimize the outflow of concrete.

[0036] Example 8 The present invention discloses a method for configuring a moving formwork for a straight pretensioned double-T beam. Using the above-mentioned moving formwork configuration system for a straight pretensioned double-T beam to precast double-T beams, it includes the following steps: Step 1: Install a plurality of concrete fixed pedestals 6 and double-T beam formwork assemblies 7 in place according to the design positions of the straight production line. Pass a plurality of parallel strands 8 through a plurality of double-T beam formwork assemblies 7, and anchor the two ends to two anchoring trolleys 5 at both ends of the straight production line respectively. The anchoring trolley 5 is connected to the tensioning jack 1 through a tensioning screw rod 2 passing through the reaction wall 4. Step 2: Correspondingly install the area one formwork assembly 7-1, area two formwork assembly 7-2, and area three formwork assembly 7-3 of each double-T beam formwork assembly 7 on the area one pedestal 6-1, area two pedestal 6-2, and area three pedestal 6-3 respectively and tighten them. At the same time, stress release members are provided at the bottoms of the area one formwork assembly 7-1 and the area three formwork assembly 7-3. Step 3: Pour concrete into each double-T beam formwork assembly 7. Step 4: Remove the outer mold of the double-T beam formwork assembly 7 and cure it in a steam curing chamber. Step 5: Remove the stress release members at the bottoms of the area one formwork assembly 7-1 and the area three formwork assembly 7-3. The tensioning jack 1 slowly retracts for relaxation. During relaxation, the inner mold and bottom mold of the area one formwork assembly 7-1, area two formwork assembly 7-2, and area three formwork assembly 7-3 slide along with the precast double-T beam. Step 6: Cut the strands 8 at both ends of each precast double-T beam and remove the end template 7-4. Step 7: After the precast double-T beam is lifted out, restore the slid double-T beam formwork assembly 7 to its original position and cycle to cast beams.

[0037] The working principle of the present invention is as follows: As Figures 1 - 10 shown, the present invention discloses a linear pre-tensioned prestressed double-T beam mobile formwork configuration system, which includes a concrete fixed pedestal 6, a double-T beam formwork assembly 7, and a tensioning assembly. The tensioning assembly includes a left tensioning assembly, a right tensioning assembly, and steel strands 8. Each double-T beam formwork assembly 7 is installed on the corresponding concrete fixed pedestal 6. A plurality of concrete fixed pedestals 6 are arranged in a row along the length direction. A plurality of bundles of steel strands 8 are arranged in parallel and sequentially pass through a plurality of double-T beam formwork assemblies 7 in a straight line. At the same time, both ends of the plurality of bundles of steel strands 8 are respectively connected to the left tensioning assembly and the right tensioning assembly for tensioning or relaxation. The present invention entirely uses straight steel strands 8, which is convenient for tensioning construction. The straight steel strands 8 do not use bending devices, etc., saving fitting materials. At the same time, it can avoid stress concentration of the steel strands, making the construction safer. The heights of the pedestal 6-1 in area one and the pedestal 6-3 in area three of the concrete fixed pedestal 6 of the present invention are both lower than the height of the pedestal 6-2 in area two. Stress release members are provided at the bottoms of the formwork assembly 7-1 in area one and the formwork assembly 7-3 in area three. During tensioning and pouring, the stress release members play a role of lifting the formwork assembly 7-1 in area one and the formwork assembly 7-3 in area three to the same horizontal plane as the formwork assembly 7-2 in area two. During relaxation and arching, the stress release members are first removed separately to release the stress during arching, ensuring that the beam body of the double-T beam is not damaged and improving the beam manufacturing efficiency.

[0038] The present invention discloses a linear pre-tensioned prestressed double-T beam mobile formwork configuration system, which includes a concrete fixed pedestal, a double-T beam formwork assembly, and a tensioning assembly. The tensioning assembly includes a left tensioning assembly, a right tensioning assembly, and a plurality of bundles of steel strands. The plurality of bundles of steel strands are arranged in parallel and sequentially pass through a plurality of double-T beam formwork assemblies in a straight line. At the same time, both ends of the plurality of bundles of steel strands are respectively connected to the left tensioning assembly and the right tensioning assembly for tensioning or relaxation. The present invention entirely uses straight steel strands, which is convenient for tensioning construction. The straight steel strands do not use bending devices, etc., saving fitting materials. At the same time, it can avoid stress concentration of the steel strands, making the construction safer.

[0039] The concrete fixed pedestal and the double-T beam formwork assembly of the present invention are set in different areas. The heights of the pedestal in area one and the pedestal in area three of the concrete fixed pedestal are both lower than the height of the pedestal in area two. Stress release members are provided at the bottoms of the formwork assembly in area one and the formwork assembly in area three of the double-T beam formwork assembly. During tensioning and pouring, the stress release members play a role of lifting the formwork assembly in area one and the formwork assembly in area three to the same horizontal plane as the formwork assembly in area two. During relaxation and arching, the stress release members are first removed separately to release the stress during arching, ensuring that the beam body of the double-T beam is not damaged.

[0040] The concrete fixed pedestal and double-T beam formwork assembly of the present invention are set in regions, so that the formworks for precast positive and negative slope beams, skewed beams, or the end regions that need to be replaced when adjusting the beam length can be independently set, making it more convenient to disassemble and assemble the formworks.

[0041] The double-T beam formwork assembly of the present invention is provided with an internal formwork sliding trolley inside the internal formwork. Compared with setting an integral vehicle frame, it has less steel consumption and a smaller volume, facilitating formwork flipping, disassembly, and assembly.

[0042] The present invention does not set a steering gear, which increases the protective layer, makes the concrete pouring and vibration more in place, and greatly reduces quality defects.

[0043] After adding the height of the double-T beam formwork assembly to the height of the concrete fixed pedestal of the present invention, the total height is within the height range convenient for the construction team (less than 1.8 m). The height of the reaction wall matches it, facilitating the construction team to carry out operations such as steel bar threading, strand anchoring, and strand tensioning, and improving the beam manufacturing efficiency.

[0044] The above has made a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those of ordinary skill in the art.

[0045] Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. A linear pre-tensioned double-T beam moving formwork configuration system, characterized in that: It includes a concrete fixed pedestal (6), a double-T beam formwork assembly (7), and a tensioning assembly. The tensioning assembly includes a left tensioning assembly, a right tensioning assembly, and several bundles of steel strands (8). The number of concrete fixed pedestals (6) is the same as that of the double-T beam formwork assemblies (7), and there are several of them. Each double-T beam formwork assembly (7) is installed on the corresponding concrete fixed pedestal (6). Several concrete fixed pedestals (6) are arranged in a row along the length direction. Several bundles of steel strands (8) are arranged in parallel and sequentially pass through several double-T beam formwork assemblies (7) in a straight line. At the same time, both ends of several bundles of steel strands (8) are respectively connected to the left tensioning assembly and the right tensioning assembly for tensioning or relaxation; The concrete fixed pedestal (6) is composed of a zone one pedestal (6-1), a zone two pedestal (6-2), and a zone three pedestal (6-3) connected in sequence. There are several zone two pedestals (6-2), and the heights of both the zone one pedestal (6-1) and the zone three pedestal (6-3) are lower than the height of the zone two pedestal (6-2); The double-T beam formwork assembly (7) is composed of a zone one formwork assembly (7-1), a zone two formwork assembly (7-2), and a zone three formwork assembly (7-3) connected in sequence. There are several zone two formwork assemblies (7-2). At the ends of the zone one formwork assembly (7-1) and the zone three formwork assembly (7-3) away from the zone two formwork assembly (7-2), end formworks (7-4) are respectively provided. The zone one formwork assembly (7-1) is correspondingly installed at the zone one pedestal (6-1). Several zone two formwork assemblies (7-2) are correspondingly installed at several zone two pedestals (6-2). The zone three formwork assembly (7-3) is correspondingly installed at the zone three formwork assembly (7-3). Stress release members are provided at the bottoms of both the zone one formwork assembly (7-1) and the zone three formwork assembly (7-3). During tensioning and pouring, the stress release members play a role in lifting the zone one formwork assembly (7-1) and the zone three formwork assembly (7-3) to the same horizontal plane as the zone two formwork assembly (7-2); during relaxation and arching, the stress release members are removed separately first to release the stress during arching.

2. The mobile formwork configuration system for a straight pretensioned prestressed double-T beam according to claim 1, characterized in that: Both the left tensioning assembly and the right tensioning assembly include a tensioning jack (1), a tensioning screw rod (2), a fastening nut (3), a reaction wall (4) and an anchoring trolley (5). One end of several bundles of steel strands (8) is respectively anchored on the anchoring trolley (5) of the left tensioning assembly, and the other end of several bundles of steel strands (8) is respectively anchored on the anchoring trolley (5) of the right tensioning assembly. One end of the tensioning screw rod (2) is fixedly connected to the anchoring trolley (5), and the other end of the tensioning screw rod (2) passes through the reaction wall (4) to connect the tensioning jack (1). The fastening nut (3) is threadedly connected to the tensioning screw rod (2) outside the reaction wall (4) to lock the tensioning position of the steel strands (8). During tensioning, the piston of the tensioning jack (1) extends, and several bundles of steel strands (8) are tightened for tensioning. After tensioning to the designed degree, it is tightened by the fastening nut (3). During relaxation, first loosen the fastening nut (3), and retract the piston of the tensioning jack (1), and several bundles of steel strands (8) are relaxed to complete the relaxation.

3. The movable formwork configuration system for a straight pretensioned prestressed double-T beam according to claim 2, wherein: The reaction wall (4) includes a concrete support (4-1) provided with a plurality of first tensioning screw rod holes (4-2), and the tensioning screw rod (2) passes through the first tensioning screw rod holes (4-2) to connect the tensioning jack (1).

4. A movable formwork configuration system for a straight-line pre-tensioned double-T beam according to claim 2, characterized in that: The anchoring trolley (5) includes an anchoring trolley body (5-1), a first steel strand hole (5-2), a second tensioning screw rod hole (5-3), anchoring trolley rollers (5-4) and a track (5-5). The anchoring trolley body (5-1) is provided with a plurality of first steel strand holes (5-2) and second tensioning screw rod holes (5-3). Several bundles of steel strands (8) respectively pass through the plurality of first steel strand holes (5-2) and are fixed. One end of the tensioning screw rod (2) passes through the second tensioning screw rod hole (5-3) and is fixed. The bottom of the anchoring trolley body (5-1) is provided with anchoring trolley rollers (5-4), and the anchoring trolley rollers (5-4) can slide along the track (5-5).

5. A linear pre-tensioned prestressed double-T beam moving formwork configuration system according to claim 1, characterized in that: The heights of the area one pedestal (6-1) and the area three pedestal (6-3) are the same, and the heights of the area one pedestal (6-1) and the area three pedestal (6-3) are lowered by 20 - 30 cm relative to the area two pedestal (6-2).

6. A movable formwork configuration system for a straight-line pre-tensioned double-T beam according to claim 1, characterized in that: The template assembly for Area 2 (7-2) includes a first inner mold sliding trolley (7-2-1), an integrated inner mold (7-2-2), a comb plate (7-2-3), a top tie rod (7-2-4), an outer mold (7-2-5), an outer mold support frame (7-2-6), an outer mold support screw rod (7-2-7), a limit plate (7-2-8), a leveling steel plate (7-2-9), embedded bolts (7-2-10), a bottom mold fixing screw rod (7-2-11), and a bottom tie rod (7-2-12). The integrated inner mold (7-2-2) is composed of an integrated inner mold and a bottom mold. A first inner mold sliding trolley (7-2-1) is provided at the bottom of the integrated inner mold (7-2-2). The first inner mold sliding trolley (7-2-1) is arranged on the leveling steel plate (7-2-9), and the leveling steel plate (7-2-9) is arranged on the top of the Area 2 pedestal (6-2). Outer molds (7-2-5) are respectively installed on both sides of the bottom mold of the integrated inner mold (7-2-2). A comb plate (7-2-3) is provided at the top of the two outer molds (7-2-5). The two outer molds (7-2-5) and the two comb plates (7-2-3) are respectively supported by two outer mold support frames (7-2-6). The bottoms of the two outer mold support frames (7-2-6) are respectively supported by two outer mold support screw rods (7-2-7). The tops of the two outer mold support frames (7-2-6) are connected by a top tie rod (7-2-4), and the bottoms of the two outer mold support frames (7-2-6) are connected by a bottom tie rod (7-2-12). A limit plate (7-2-8) is provided at the contact position between the outer side of the bottom mold of the integrated inner mold (7-2-2) and the Area 2 pedestal (6-2). Embedded bolts (7-2-10) are respectively embedded on both sides of the width of the Area 2 pedestal (6-2). The embedded bolts (7-2-10) are connected to the bottom mold of the integrated inner mold (7-2-2) through the bottom mold fixing screw rod (7-2-11) to prevent the integrated inner mold (7-2-2) from being lifted with the double T-beam when lifting the beam.

7. The mobile formwork configuration system for straight-line pre-tensioned double-T beams according to claim 6, wherein: The template assembly for Area 1 (7-1) includes a first split inner mold (7-1-1) and stress release components. The stress release components are a first roller (7-1-2) and a second roller (7-1-3). The first split inner mold (7-1-1) is composed of a split inner mold and a bottom mold. A first roller (7-1-2) and a second roller (7-1-3) are respectively provided at the bottoms of the inner mold and the bottom mold. The first roller (7-1-2) and the second roller (7-1-3) are arranged on the top of the Area 1 pedestal (6-1).

8. The mobile formwork configuration system for a straight pre-tensioned double-T beam according to claim 6, wherein: The template assembly for Area 3 (7-3) includes a second split inner mold (7-3-1) and a stress release component. The stress release component is a bottom mold support rod (7-3-2). The second split inner mold (7-3-1) is composed of a split inner mold and a bottom mold. A third roller (7-3-3) is provided at the bottom of the inner mold, and a bottom mold support rod (7-3-2) is provided at the bottom of the bottom mold. The bottom mold support rod (7-3-2) and the third roller (7-3-3) are both arranged on the top of the Area 3 pedestal (6-3).

9. A linear pre-tensioned prestressed double-T beam moving formwork configuration system according to claim 1, characterized in that: The end formwork (7-4) includes an end formwork body (7-4-1) and a strand trough box (7-4-2). A plurality of strand trough boxes (7-4-2) are arranged on the end formwork body (7-4-1). A plurality of second strand holes (7-4-3) are arranged on the strand trough box (7-4-2). The strands (8) pass through the second strand holes (7-4-3). A stepped rubber plug (7-4-4) is sleeved between the strand (8) and the second strand hole (7-4-3). The stepped rubber plug (7-4-4) is pressed tightly by a pressing plate (7-4-5). A rubber strip groove (7-4-6) is arranged at the edge of the end formwork body (7-4-1), and a rubber strip is arranged in the rubber strip groove (7-4-6).

10. A method for configuring a moving formwork for a straight-line pre-tensioned double-T beam, characterized in that, Using the linear pre-tensioned double-T beam moving formwork configuration system according to any one of claims 2 to 9 for precasting double-T beams, the following steps are included: Step 1: Install a plurality of concrete fixed pedestals (6) and double-T beam formwork assemblies (7) in place according to the designed positions of the linear production line. Pass a plurality of parallel strands (8) through a plurality of double-T beam formwork assemblies (7), and anchor the two ends thereof to two anchoring trolleys (5) at both ends of the linear production line respectively. The anchoring trolley (5) is connected to a tensioning jack (1) through a tensioning screw rod (2) passing through a reaction wall (4). Step 2: Correspondingly install and tension the area one formwork assembly (7-1), area two formwork assembly (7-2) and area three formwork assembly (7-3) of each double-T beam formwork assembly (7) on the area one pedestal (6-1), area two pedestal (6-2) and area three pedestal (6-3), and at the same time, stress release members are arranged at the bottoms of the area one formwork assembly (7-1) and the area three formwork assembly (7-3). Step 3: Pour concrete into each double-T beam formwork assembly (7). Step 4: Remove the outer formwork of the double-T beam formwork assembly (7) and cure it in a curing chamber. Step 5: Remove the stress release members at the bottoms of the area one formwork assembly (7-1) and the area three formwork assembly (7-3). Slowly retract and relax the tensioning jack (1). When relaxing, the inner formwork and bottom formwork of the area one formwork assembly (7-1), area two formwork assembly (7-2) and area three formwork assembly (7-3) slide along with the precast double-T beam. Step 6: Cut the strands (8) at both ends of each precast double-T beam and remove the end formwork (7-4). Step 7: After taking out the precast double-T beam, restore the double-T beam formwork assembly (7) after sliding to its original position and cycle to cast beams.

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