Device and method for supporting corner formwork during secondary concrete pouring at the intersection of precast beams and slabs

Abstract

The present invention belongs to the technical field of formwork support in concrete engineering, and discloses a device and method for supporting an angle form during secondary concrete pouring at the intersection of prefabricated beams and slabs. An angle steel connecting plate is connected to two angle steels by bolts respectively, and both angle steels are provided with angle steel reserved holes; an L-shaped steel plate is fixed to the right end of the two angle steels by bolts, and the L-shaped steel plate is fixed to the side of the prefabricated reinforced concrete beam by expansion bolts; a diagonal brace support is provided on the angle steel connecting plate, and a support adjustment device is provided on the left end of the diagonal brace support; the diagonal brace support is connected to the diagonal brace rod system through a hinged connection hole, and the diagonal brace rod system is connected to the steel formwork system through a hinged connection hole. The present invention can adjust the close contact between the steel formwork and the surface of the beam and slab by arranging the support adjustment device and the diagonal brace rod system; the angle formwork is subjected to both vertical top support force and horizontal thrust under the action of the diagonal brace, so that the steel formwork is close to the surface of the beam and slab, achieving seamless docking and strong sealing, while preventing the occurrence of slurry leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of formwork support in concrete engineering, and in particular relates to a device and method for supporting an angle form during secondary concrete pouring at the intersection of prefabricated beams and slabs. Background Art

[0002] At present, the beams, slabs, columns and exterior walls of prefabricated buildings are all prefabricated in factories. After qualified maintenance, they are transported to the site for assembly. Compared with traditional cast-in-place construction, it is more convenient and faster, especially with less impact on the environment. In recent years, it has attracted more and more attention from the industry, and with the strong support of the government, it has ushered in an opportunity for development. During construction, the prefabricated beams are installed first and then the prefabricated slabs. The slab reinforcement extends into the beams, and the prefabricated slabs are used as the template for the secondary concrete pouring of the beams and slabs. The bottom formwork of the traditional cast-in-place structure is close to the upper edge of the beam side formwork, and the beam side formwork is set on the bottom formwork of the beam, forming a template system with strong integrity and tight joints, so there are few phenomena such as leakage and mold running at the corners. The temporary support of the prefabricated beams and slabs of the prefabricated structure mainly adopts steel pipe support, such as fastener steel pipe rack and disc buckle steel pipe rack, etc. Compared with the traditional cast-in-place structure, the bottom formwork and beam side formwork are omitted, but it is worth noting that the corners where the prefabricated beams and slabs intersect are prone to mold running and leakage during the secondary concrete pouring. The common practice is to add longitudinal and transverse horizontal bars and transverse square wood strips to the beam-slab support vertical bars near the bottom of the beam, and add longitudinal and transverse horizontal bars and diagonal bracing boards near the bottom of the board; set square wood as the template at the intersection of the prefabricated beam and slab, and set diagonal wood as its support. The lower end of the diagonal wood is set on the transverse square wood strip near the bottom of the prefabricated beam, and the upper end is used to press the square wood used as the template to provide vertical support force for it; at the same time, a diagonal bracing board is set, one end of which is set on the horizontal longitudinal vertical bar near the bottom of the prefabricated board, and the other end is pressed against the square wood used as the template to provide horizontal support force for it. The disadvantage of this method is that the diagonal bracing rod uses the transverse square wood strips added at the bottom of the prefabricated beam as a support, and the square wood is pressed against by the strong extrusion method. The diagonal bracing rod and the transverse square wood strips are not fixed firmly and are easy to loosen; similarly, the diagonal bracing board and the longitudinal vertical bar added near the bottom of the prefabricated board are not fixed firmly and are easy to loosen, and the horizontal force provided is also limited, and the vertical bar becomes an eccentric force-bearing member, reducing the bearing capacity of the prefabricated board support frame. The square timber and the composite beam are not close together, resulting in leakage during pouring. In addition, longitudinal horizontal bars, transverse horizontal bars and wooden supports need to be added. The wooden support components have a small turnover number, and the operating space is limited during the construction of the above support system, and the material transportation is inconvenient, resulting in a surge in labor costs, which is difficult to accept. It is urgent to develop new processes and methods to solve the shortcomings of traditional processes.

[0003] From the above analysis, it can be seen that the traditional technology has the problems of complex construction, low material turnover, high cost, loose joints, leakage and mold running.

[0004] The difficulty of solving the above problems and defects is: to fundamentally solve the current process defects, not only is the construction difficult and costly, but the quality is also difficult to guarantee. The reason is that during the secondary concrete pouring of precast beams and slabs, the corner formwork system bears both vertical force and lateral thrust, so it is necessary to add vertical bars and horizontal bars at the same time to tighten the formwork system to the precast slab vertically and to the side of the precast beam horizontally, so that the corner formwork is close to the beam and the slab. Since the process of installing the vertical and horizontal bars for the corner formwork is after the construction of the prefabricated beam and slab support system, the construction space is limited, resulting in low work efficiency; secondly, the support system of the prefabricated slab is mainly vertical, but in order to place the corner formwork, a horizontal horizontal bar needs to be added near the bottom of the floor slab, which increases the amount of prefabricated slab support engineering; thirdly, in the process of processing, manufacturing and installation of prefabricated beams and slabs, it is inevitable that there will be inaccurate dimensions and uneven surfaces. The corner formwork made of square wood cannot change with the shape of the structure, so even if vertical and horizontal bars are added, it is difficult to make the square wood close to the wall of the prefabricated beam and slab, resulting in difficulty in ensuring quality. The significance of solving the above problems and defects is: It can be seen that the key to ensuring the quality of the formwork at the intersection of prefabricated beams and slabs is to ensure the vertical and horizontal stability of the formwork system and to ensure that the formwork and beams and slabs are in close contact. To this end, it is urgent to develop new processes, new methods and new materials. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a device and method for supporting corner formwork during secondary concrete pouring at the intersection of precast beams and slabs.

[0006] The present invention is implemented as follows: a device for supporting an angle formwork during secondary concrete pouring at the intersection of a precast beam and a slab, wherein the device for supporting an angle formwork during secondary concrete pouring at the intersection of a precast beam and a slab is provided with a steel beam, a support adjustment device, a diagonal brace system and a steel formwork system;

[0007] The left and right ends of the two angle steels are connected by bolts using angle steel connecting plates and L-shaped steel plates to form a steel beam. At the same time, an L-shaped steel plate is set at the right end and fixed to the side of the prefabricated reinforced concrete beam by expansion bolts. Holes are reserved on both angle steels. Furthermore, the short limbs of the angle steels of the steel beam are connected vertically, and the long limbs are combined in the horizontal direction to form a steel beam surface. A diagonal brace support is set on the steel beam, and a support adjustment device is set at the left end of the diagonal brace support.

[0008] The diagonal brace support is connected to the diagonal brace rod system through hinged connection holes, and the diagonal brace rod system is connected to the steel formwork system through hinged connection holes.

[0009] Further, the diagonal brace support is provided with a support bottom plate, the support bottom plate is respectively welded to the support back plate and the diagonal brace rod connecting plate, and the support back plate and the diagonal brace rod connecting plate are connected by T-shaped welding;

[0010] A clamping plate is welded on the side of the support bottom plate, and the two are connected by T-shaped welding; an anti-warping plate is provided under the clamping plate, and the two are connected by T-shaped welding; a reserved hole is provided on the support bottom plate, and the hole spacing is half of the reserved hole spacing of the support bottom plate. A connecting steel cylinder for fixing the top push rod is welded on the side of the support back plate, and a hinged connection hole with the lower diagonal support rod is provided on the diagonal support rod connecting plate.

[0011] Furthermore, the support adjustment device is to set an L-shaped pressure plate on the steel beam, and the two are connected by bolts. The L-shaped pressure plate is provided with a steel sleeve with threads on both the inner and outer walls;

[0012] The push rod passes through the wire sleeve by means of a screw connection, and the right end extends into a steel cylinder arranged on the side of the support pressure plate, and a push rod handle is welded on the left end of the push rod.

[0013] Furthermore, the diagonal brace system is provided with a diagonal brace connecting plate, the lower end of the lower diagonal brace screw is hinged to the diagonal brace connecting plate through a connecting hole, the upper end is screwed to the steel sleeve (through a thread), the other end of the steel sleeve is sleeved with the upper diagonal brace screw, the upper diagonal brace screw is connected to the (triangular) stiffening steel plate through a hinged connecting hole, and the stiffening angle steel is welded to the steel mold and the stiffening steel plate at the same time.

[0014] Furthermore, a steel gasket and a nut are provided on the upper port of the steel sleeve.

[0015] Furthermore, the upper diagonal support screw rod is provided with a reserved hole, the reserved hole is aligned with the reserved hole on the wall of the steel sleeve, and a fixing bolt is screwed thereon.

[0016] Furthermore, the steel formwork system is provided with a steel formwork, a stiffening steel plate and a stiffening angle steel, the steel plate is welded to the stiffening angle steel, and the stiffening angle steel is welded to the (triangular) stiffening steel plate;

[0017] A bolt rod fixing piece is welded on the side of the steel mold, the bolt rod fixing piece is plugged with a bolt rod, and the bolt rod fixing piece and a fixing fastener with the bolt rod handle are all welded to the steel mold.

[0018] Another object of the present invention is to provide a device and method for supporting corner molds during secondary concrete pouring at the intersection of precast beams and slabs using the above device and method, the device and method for supporting corner molds during secondary concrete pouring at the intersection of precast beams and slabs specifically comprises the following steps:

[0019] Step 1: After the various components of the corner mold support system processed and manufactured in the factory are transported to the site, the horizontal support system, the corner mold and diagonal support screw system, and the internal force of the diagonal support screw are installed in sequence;

[0020] Step 2: When installing the horizontal support system, two identical angle steels are combined into a steel beam using an angle steel connecting plate, and the diagonal support and the support adjustment device are installed on the steel beam. The lower diagonal support screw is successively connected to the steel sleeve and the support connecting plate, and then the L-shaped steel plate is fixed with expansion bolts on the side near the bottom of the prefabricated reinforced concrete beam, thereby forming a horizontal support system for the diagonal support screw;

[0021] Step 3: When installing the angle form and the diagonal brace screw system, first weld the steel formwork to the stiffening angle steel, and at the same time, hinge the upper diagonal brace screw with the stiffening angle steel plate through the hinge connection hole, and then extend the upper diagonal brace screw into the steel sleeve;

[0022] Step 4: After the horizontal support system, angle mold and diagonal support screw system are installed, start adjusting the internal force of the diagonal support screw.

[0023] Furthermore, in step 4, the method for adjusting the internal force of the diagonal support screw comprises:

[0024] The first method is to fix the support base plate and the composite steel beam in place with bolts, and then adjust the internal force by tightening the nuts on the upper diagonal support screws;

[0025] The second method is to first extend the upper diagonal support screw into the steel sleeve and quickly connect the two with steel bolts; then turn the push rod handle to push the support forward through the push rod to the appropriate position and then fix it to the composite steel beam with bolts;

[0026] The third method is to first tighten the nut on the upper diagonal support screw, then turn the push rod handle, push the support forward through the push rod, and then fix it to the combined steel beam with bolts when it is in the appropriate position. The nut can also be used for fine-tuning during pushing to bring the support to the appropriate position.

[0027] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows: the present invention can adjust the closeness between the steel mold and the beam and slab surface by providing a support adjustment device and a diagonal brace rod system; the angle mold is subjected to both vertical top support force and horizontal thrust under the action of the diagonal brace, so that the steel mold is close to the surface of the prefabricated beam and slab, achieving seamless docking and strong sealing, while preventing the occurrence of slurry leakage. The angle mold support system of the present invention is easy to install, can be reused many times, is low in cost, and is economical and efficient.

[0028] In the present invention, the short limbs of the angle steel are connected vertically, and the long limbs are combined into a steel beam surface in the horizontal direction, which increases the contact area with the diagonal brace support and the support adjustment device, and improves the stability of the connection between the two and the steel beam. In the present invention, the diagonal brace support realizes the support of the diagonal brace rod system. In the present invention, the diagonal brace rod system realizes the oblique support of the steel mold. In the present invention, a steel gasket and a nut are provided at the upper end of the steel sleeve, and the internal force of the diagonal brace rod can be adjusted by the nut.

[0029] The support adjustment device of the present invention is connected to the L-shaped pressure plate by bolts, and the L-shaped pressure plate is provided with a steel sleeve with threads on both the inner and outer walls; the steel sleeve is connected to the L-shaped pressure plate by its outer thread and nut, and the push rod passes through the steel sleeve by screwing, and the right end extends into the steel cylinder on the side of the support pressure plate, and a push rod handle is welded to the left end of the push rod. The push rod is used to realize the horizontal forward movement of the diagonal support along the steel beam, and at the same time, an anti-warping plate is provided at the bottom of the support to prevent the support from warping up under the action of the push rod.

[0030] The steel formwork system of the present invention is provided with a reinforcing angle steel, and the reinforcing angle steel is welded to the steel formwork and the reinforcing steel plate at the same time; a bolt rod fixing piece is welded to the steel formwork on one side of the joint of adjacent steel formworks, and a bolt rod handle fixing fastener is welded to the steel formwork on the other side; the bolt rod is inserted into the bolt rod fixing piece of the adjacent steel formwork, so as to realize seamless connection between the adjacent steel formworks. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic diagram of the structure of a device for supporting corner formwork during secondary concrete pouring at the intersection of precast beams and slabs provided by an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of the side elevation structure of the corner form support system provided in an embodiment of the present invention.

[0033] Figure 3 It is a schematic diagram of the front elevation structure of the connection between the support and the composite steel beam provided in an embodiment of the present invention.

[0034] Figure 4 It is a schematic diagram of the front elevation structure of the upper and lower diagonal support screws connected to the steel sleeve provided in an embodiment of the present invention.

[0035] Figure 5 It is a schematic diagram of the side elevation structure of the connection between the upper and lower diagonal support screws and the steel sleeve provided in an embodiment of the present invention.

[0036] Figure 6 It is a schematic diagram of the plan layout structure of the corner formwork support system provided in an embodiment of the present invention.

[0037] Figure 7 It is a schematic diagram of the side elevation structure of the template stiffening steel plate provided in an embodiment of the present invention.

[0038] Figure 8 It is a schematic diagram of the front elevation structure of the template stiffening steel plate provided in an embodiment of the present invention.

[0039] Fig. 9 It is a schematic diagram of the steel plug connection structure at the template joint provided by an embodiment of the present invention.

[0040] Fig.10The present invention is a flowchart of a method for providing a device for supporting corner forms during secondary concrete pouring at the intersection of precast beams and slabs provided by an embodiment of the present invention.

[0041] In the figure: 1. Prefabricated reinforced concrete beam; 2. Expansion bolt; 3. Angle steel; 4. L-shaped steel plate; 5. L-shaped steel plate reserved hole; 6. Angle steel connecting plate; 7. Angle steel reserved hole; 8. Support base plate; 9. Support back plate; 10. Diagonal brace connecting plate; 11. Support base plate reserved hole; 12. Push rod; 13. Steel cylinder; 14. L-shaped pressure plate; 15. Steel wire sleeve; 16. Nut; 17. L-shaped pressure plate vertical plate reserved hole; 18. Push rod handle; 19. Diagonal brace rod system; 20. Steel plug; 2 1. Steel mold; 22. Bolt rod fixings; 23. Bolt rod handle fixing fasteners; 24. Bolt rod; 25. Precast reinforced concrete slab; 26. Precast reinforced concrete beam stirrups; 27. Reinforcing angle steel; 28. Upper diagonal support screw; 29. ​​Hinge connection hole; 30. Upper diagonal support screw reserved hole; 31. Nut; 32. Steel sleeve; 33. Steel gasket; 34. Steel sleeve wall reserved hole; 35. Lower diagonal support screw; 36. Clamp; 37. Anti-warp plate; 38. Steel bolt; 39. Reinforcing steel plate. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] In view of the problems existing in the prior art, the present invention provides a device and method for supporting corner formwork during secondary concrete pouring at the intersection of precast beams and slabs. The present invention is described in detail below in conjunction with the accompanying drawings.

[0044] like Figure 1 As shown, the angle steel connecting plate 6 is connected to the two angle steels 3 by bolts respectively, and the two angle steels 3 are provided with angle steel reserved holes 7; the short limbs of the angle steels are connected vertically, and the long limbs are combined into a steel beam surface in the horizontal direction.

[0045] The right ends of the two angle steels 3 are fixed with L-shaped steel plates 4 by bolts, and the L-shaped steel plates 4 are fixed to the side surfaces of the prefabricated reinforced concrete beams 1 by expansion bolts 2 .

[0046] like Figure 2-Figure 6 As shown, the diagonal brace support includes: a support base plate 8, a support back plate 9, a support connecting plate 10, a support base plate reserved hole 11, a connecting steel cylinder 13, a lower diagonal brace rod 35, a clamping plate 36, an anti-warp plate 37, and a connecting steel cylinder 13.

[0047] The support bottom plate 8 is welded to the support back plate 9 and the diagonal brace connecting plate 10 respectively, and the support back plate 9 and the diagonal brace connecting plate 10 are T-welded.

[0048] A clamping plate 36 is welded to the side of the support bottom plate 8 , and the clamping plate 36 is connected to the anti-tilt plate 37 by T-shaped welding.

[0049] The support base plate 8 is provided with support base plate reserved holes 11, and the spacing of the angle steel reserved holes 7 is twice that of the support base plate reserved holes 11, the purpose of which is to facilitate the alignment of the reserved holes of the two during the later installation process and facilitate bolt fixing and connection.

[0050] A connecting steel cylinder 13 for fixing the push rod 12 is provided on the side of the support back plate 9 , and a hinged connection hole 29 for connecting with the lower diagonal support rod 35 is provided on the diagonal support rod connecting plate 10 .

[0051] The diagonal brace system includes: an upper diagonal brace screw rod 28, a steel sleeve 32 and a lower diagonal brace screw rod 35;

[0052] The diagonal support rod connecting plate 10 is connected to the lower diagonal support screw 35 through the hinged connection hole 29. The lower diagonal support screw 35 is screwed to one end of the steel sleeve 32, and the other end is sleeved with the upper diagonal support screw 28. The upper diagonal support screw 28 is connected to the stiffening angle steel 27 through the hinged connection hole 29, and the stiffening angle steel 27 is welded to the steel mold 21.

[0053] A steel washer 33 and a nut 31 are provided at the upper end of the steel sleeve 32, and the internal force of the diagonal brace can be adjusted through the nut.

[0054] The upper diagonal support screw rod 28 is provided with a reserved hole 30 , and the steel sleeve 32 is adjusted so that the reserved hole 30 is aligned with the reserved hole 34 on the wall of the steel sleeve 32 .

[0055] The support adjustment device comprises: an L-shaped pressure plate 14 , a wire sleeve 15 with threads on both inner and outer walls, a push rod 12 and a push rod handle 18 .

[0056] The angle steel 3 is connected to the L-shaped pressure plate 14 by bolts. The L-shaped pressure plate 14 is provided with a wire sleeve 15 with threads on the inner and outer walls. The push rod 12 passes through the wire sleeve 15 by screwing, and its right end should extend into the steel cylinder 13. A push rod handle 18 is welded to the left end of the push rod 12.

[0057] like Figure 7-Figure 9 As shown, the steel formwork system includes: a steel formwork 21, a bolt rod fixing part 22, a bolt rod handle fixing fastener 23, a bolt rod 24, a stiffening angle steel plate 27, a bolt rod 24, and a stiffening steel plate 39.

[0058] The stiffening angle steel 27 is welded to the steel mold 21 and the stiffening steel plate 39 respectively, and the steel mold 21 is welded to the stiffening steel plate 39. A bolt rod fixing piece 22 is welded to the side of the steel mold 21, and the bolt rod fixing piece 22 is plugged with a bolt rod 24, and the other end of the bolt rod 24 is fixed by a bolt rod handle fixing fastener 23.

[0059] like Fig.10As shown, the method of the device for supporting the corner formwork during the secondary concrete pouring at the intersection of the precast beam and slab provided by the embodiment of the present invention includes:

[0060] S101: After the various components of the corner mold support system processed and manufactured in the factory are transported to the site, the horizontal support system is installed, the corner mold and diagonal support screw system is installed, and the internal force of the diagonal support screw is adjusted.

[0061] S102: When installing the horizontal support system, two identical angle steels are combined into a steel beam using an angle steel connecting plate. At the same time, the diagonal brace support and the support adjustment device are installed on the steel beam. The lower diagonal brace screw is successively connected to the steel sleeve and the support connecting plate. Then, the L-shaped steel plate is fixed to the bottom side of the precast reinforced concrete beam with expansion bolts, thereby forming a horizontal support system for the diagonal brace screw.

[0062] S103: When installing the angle form and diagonal brace screw system, first weld the steel formwork to the stiffening angle steel plate, and at the same time, hinge the upper diagonal brace screw with bolts through the hinge connection hole, and then extend the upper diagonal brace screw into the steel sleeve.

[0063] S104: After the horizontal support system and the corner formwork and diagonal support screw system are installed, start adjusting the internal force of the diagonal support screw.

[0064] In S104 provided by the present invention, the method for adjusting the internal force of the diagonal support screw includes:

[0065] The first method is to first fix the support base plate and the composite steel beam in the appropriate position with bolts, and then adjust the internal force through the nut on the upper diagonal support screw.

[0066] The second method is to first extend the upper diagonal support screw into the steel sleeve and quickly connect the two with steel bolts; then turn the push rod handle, push the support forward through the push rod, and then fix it to the combined steel beam with bolts to the appropriate position.

[0067] The third method is to first tighten the nut on the upper diagonal support screw, then turn the push rod handle, push the support forward through the push rod, and then fix it to the combined steel beam with bolts when it is in the appropriate position. The nut can also be used for fine-tuning during pushing to bring the support to the appropriate position.

[0068] The technical solution of the present invention is further described below in conjunction with specific implementations.

[0069] The angle formwork support system for the secondary concrete pouring at the intersection of the precast beam and slab includes five major components: a composite steel beam formed by two identical angle steels 3 through a connecting plate 3, a diagonal brace support, a support adjustment device, a diagonal brace system and a steel formwork system (see Figure 1 and Figure 3 The processing and manufacturing of the major components and the overall installation method of the corner mold support system are as follows:

[0070] (1) The composite steel beam is composed of two identical angle steels 3 connected by an angle steel connecting plate 6 and bolted together. The blanking length S4 of the angle steel 3 is generally 600 mm to 800 mm. The screw holes 7 are preset on the horizontal surface, and the screw hole spacing S1 is 50 mm to 100 mm (see Figure 1 ). Considering that the composite steel beam needs to meet certain rigidity requirements, the present invention uses angle steel. At the same time, in order to prevent the angle steel from being too heavy, it is recommended to use a small (light) angle steel; during installation, the short legs of the angle steel are connected vertically, and the spacing S2 is determined by the thickness t of the clamping plate 36 and the gap on both sides. The thickness t of the clamping plate 36 is generally 3-5mm, and the gap on each side is 3-5mm, so the S2 value is generally controlled at 10-15mm; the long legs are combined into a steel beam surface in the horizontal direction to ensure that the edges are flush (see Figure 3 ).

[0071] (2) The diagonal brace support is set on the composite steel beam surface and consists of a support base plate 8, a support back plate 9, a support connection plate 10, a clamping plate 36, an anti-warping plate 37 and a connecting steel tube 13. Screw holes 11 are reserved on the support base plate 8, and the spacing S3 is 0.5S2 (see Figure 1 ); the side of the support back plate 9 is welded with a connecting sleeve 13 for fixing the push rod 12, and the diagonal support rod connecting plate 10 is provided with a hinged connection hole 29 with the lower diagonal support rod 35; the support back plate 9 and the diagonal support rod connecting plate 11 are connected by T-shaped welding, and are welded to the support bottom plate 8 (see Figure 2 The anti-warp plate 37 is connected to the clamp plate 36 by T-shaped welding, and the length of each side extending out of the short limb of the angle steel 3 is not less than 20mm. The clamp plate 36 is welded to the middle of the support bottom plate 8, and its length is 3-5mm longer than the short limb of the angle steel 3. The distance S6 between the anti-warp plate 37 and the edge of the short limb of the angle steel 3 is strictly controlled to be no more than 5mm to prevent the support bottom plate 8 from warping too much when the push rod 12 is in operation (see Figure 3 ).

[0072] (3) The main function of the support adjustment device is to adjust the internal force of the diagonal brace support by adjusting the position of the diagonal brace support. The device consists of an L-shaped pressure plate 14, a steel wire sleeve 15 with threads on the inner and outer walls, a push rod 12 and a push rod handle 18. The bottom of the L-shaped pressure plate 14 is bolted to the composite steel beam, and the reserved hole 17 on the upper part is used to install the steel sleeve 15. The steel sleeve 15 is clamped with a nut 16 for easy removal and replacement. The push rod 12 passes through the steel sleeve 15 and extends into the connecting steel sleeve 13, with the top of the rod close to the support back plate 9. The push rod handle 18 is rotated with a socket wrench to push the support bottom plate 9 forward to the appropriate position to be bolted to the composite steel beam (see Figure 2 ).

[0073] (4) The diagonal brace system consists of an upper diagonal brace screw 28, a steel sleeve 32 and a lower diagonal brace screw 35. The upper diagonal brace screw 28 is provided with a reserved hole 30 with a spacing S5 of 50 mm to 100 mm (see Figure 4 ), used for quick connection with the steel sleeve 32, its upper end is hinged with the stiffening rib angle steel 27 through the hinge connection hole 29, and the lower end extends into the steel sleeve 32; the lower end of the lower diagonal support screw 35 is hinged with the support connecting plate 10 through the hinge connection hole 29, and the upper end is connected to the steel sleeve 32; holes 34 are reserved on the steel sleeve 32, and the hole spacing S5 is 50mm-100mm (see Figure 5 ), the lower end is connected to the lower diagonal support screw 35, and the upper end is provided with a steel gasket 33 and a nut 31, through which the internal force of the diagonal support rod can be adjusted (see Figure 2 ).

[0074] (5) The steel formwork system consists of a steel formwork 21, a stiffening angle steel 27 and a bolt rod 24. The steel formwork 21 is made of 0.8mm-1.2mm thick galvanized iron sheet processed into an equilateral angle steel, and the length of each side S8 is not less than 200mm (see Figure 7 ), the steel formwork 21 at the corner of the building should be cut off at a 45° angle (see Figure 6 ). In order to improve the rigidity of the formwork, stiffening angle steel plates 27 and stiffening steel plates 39 are added every 500mm-1000mm. Figure 7 and Figure 8 As shown, the steel template 21 is welded to the stiffening steel plate 39, and the outer extension width S9 of each side of the stiffening steel plate 39 is not less than 100mm (see Figure 8 ), and weld the stiffening angle steel 27 and the stiffening steel plate 39 (see Figure 7 and Figure 8 ); the end stiffening angle steel 27 is not more than 500mm away from the template end S10; each section of the template support system is equipped with at least 2 sets of diagonal bracing rods 19, and the spacing S11 should not be greater than 2500mm (see Figure 6 In order to ensure that the joint is smooth, tight, and does not leak, a bolt rod 24 is set at the joint to reinforce the connection. During construction, it is inserted into the bolt rod fixing piece 22 of the adjacent steel formwork 21, and the bolt rod 24 is fixed to the bolt rod handle fixing fastener 23 (see Fig. 9 ).

[0075] During installation, plan the number of corner formwork support sections, the length of each section, and the number of sets of diagonal bracing rods 19 according to the room size (see Figure 6 ), after confirmation, it will be processed and manufactured by the factory and transported to the site for installation. According to the construction process, the entire installation process can be divided into three steps: installation of the horizontal support system, installation of the angle mold and diagonal support screw system, and adjustment of the internal force of the diagonal support screw. When installing the horizontal support system, the angle steel connecting plate 6 is used to combine two identical angle steels 3 into a steel beam (see Figure 1 ), and install the diagonal brace support and support adjustment device on the steel beam (see Figure 2 ), the lower diagonal brace screw 35 is successively connected with the steel sleeve 32 and the support connecting plate 10, and then the L-shaped steel plate 4 is fixed with the expansion bolt 2 on the side of the bottom of the prefabricated reinforced concrete beam 1 (Note: the optimal angle θ between the lower diagonal brace 35 and the angle steel 3 is 45°-60°), thereby forming a horizontal support system of the diagonal brace screw; when installing the angle mold and the diagonal brace screw system, the steel mold 21 is first welded to the stiffening angle steel 27, and the upper diagonal brace screw 28 is bolted through the hinge connection hole 29 (see Figure 2 ), then extend the upper diagonal support screw 28 into the steel sleeve 32 (see Figure 4 After the horizontal support system and the angle mold and diagonal support screw system are installed, the internal force of the diagonal support screws (lower diagonal support screws 28 and upper diagonal support screws 35) is adjusted. There are three adjustment methods. The first is to first fix the support base plate 8 and the composite steel beam in the appropriate position with bolts, and then adjust its internal force through the nut 31 on the upper diagonal support screw 28; the second method is to first extend the upper diagonal support screw 28 into the steel sleeve 32 (see Figure 4 ), and quickly connect the two with steel bolts, then turn the push rod handle 18, push the support forward through the push rod 12, and then fix it to the combined steel beam with bolts to the appropriate position. Since the preset screw hole 7 on the angle steel 3 has a spacing S1 of 50mm-100mm, and the screw hole 11 is reserved on the support bottom plate 8, and the spacing S3 is 0.5S1, the holes of the two are easy to align during the forward movement of the support. The third method is to first tighten the nut 31 on the upper diagonal support screw 28, then turn the push rod handle 18, push the support forward through the push rod 12, and then fix it to the combined steel beam with bolts to the appropriate position. The nut 31 can also be used for fine adjustment during the push to bring the support to the appropriate position.

[0076] The working principle of the present invention is as follows: after the various components of the angle mold support system processed and manufactured in the factory are transported to the site, the horizontal support system, the angle mold and diagonal brace screw system, and the internal force of the diagonal brace screw are installed in sequence. When installing the horizontal support system, two identical angle steels 3 are combined into a steel beam using the angle steel connecting plate 6, and the diagonal brace support and the support adjustment device are installed on the steel beam. The lower diagonal brace screw 35 is successively connected to the steel sleeve 32 and the support connecting plate 10, and then the L-shaped steel plate 4 is fixed with the expansion bolt 2 on the side of the prefabricated reinforced concrete beam 1 near the bottom, thereby forming a horizontal support system for the diagonal brace screw; when installing the angle mold and diagonal brace screw system, the steel template 21 is first welded to the stiffening angle steel plate 27, and at the same time, the upper diagonal brace screw 28 is bolted and hinged through the hinge connection hole 29, and then the upper diagonal brace screw 28 is extended into the steel sleeve 32. After the horizontal support system, the angle mold and the diagonal support screw system are installed, the internal force of the diagonal support screws (the lower diagonal support screws 28 and the upper diagonal support screws 35) is adjusted. There are three adjustment methods. The first is to first fix the support base plate 8 and the composite steel beam with bolts at the appropriate position, and then adjust its internal force through the nut 31 on the upper diagonal support screw 28; the second method is to first extend the upper diagonal support screw 28 into the steel sleeve 32, and quickly connect the two with steel bolts, and then rotate the push rod handle 18, push the support forward through the push rod 12, and then fix it to the appropriate position with the composite steel beam with bolts. The third method is to first tighten the nut 31 on the upper diagonal support screw 28, and then rotate the push rod handle 18, push the support forward through the push rod 12, and then fix it to the appropriate position with the composite steel beam with bolts. The nut 31 can also be used for fine-tuning during pushing to bring the support to the appropriate position.

[0077] The corner formwork support system is easy to install and has low cost. The corner formwork is subjected to both vertical supporting force and horizontal thrust under the action of the diagonal brace, so that the steel formwork is close to the concrete surface of the beam and slab, achieving seamless connection and strong sealing, basically eliminating the occurrence of leakage, and is economical and efficient.

[0078] The technical effects of the present invention are described in detail below in conjunction with experiments.

[0079] The test results show that by installing a socket wrench on the push rod handle 18 and rotating the push rod 12, under the constraint of the anti-rocking plate 37, the support base plate 8 basically moves forward close to the steel beam 3, and the adjustment of the internal force of the diagonal brace rod is very simple. Even if the support base plate 8 is not bolted to the angle steel 3, the diagonal brace rod system will not loosen, thanks to the longer design of the wire sleeve 15.

[0080] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field is within the technical scope disclosed by the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for supporting corner formwork during secondary concrete pouring at the intersection of precast beams and slabs, characterized in that: The device for supporting the corner formwork during the secondary concrete pouring at the intersection of the precast beam and slab is provided with: Angle steel connecting plate; The angle steel connecting plate is connected to the two angle steels by bolts respectively, and reserved holes are set on the two angle steels; The right ends of the two angle steels are fixed with L-shaped steel plates by bolts, and the L-shaped steel plates are fixed to the sides of the prefabricated reinforced concrete beams by expansion bolts; An angle steel connecting plate is provided with an oblique brace support, and a support adjustment device is provided at the left end of the oblique brace support; The diagonal brace support is connected to the diagonal brace system through a hinged connection hole, and the diagonal brace system is connected to the steel formwork system through a hinged connection hole; The short limbs of the angle steel are connected vertically, and the long limbs are combined into a steel beam surface in the horizontal direction; The diagonal brace support is provided with a support bottom plate, the support bottom plate is respectively welded to the support back plate and the diagonal brace connecting plate, and the support back plate and the diagonal brace connecting plate are connected by T-shaped welding; A clamping plate is welded on the side of the support bottom plate, and the clamping plate is connected to the anti-warp plate by T-shaped welding; The support bottom plate is provided with a support bottom plate reserved hole, which is aligned with the angle steel reserved hole, and the two are fixed by bolts; A connecting steel sleeve for fixing the push rod is welded on the side of the support back plate, and a hinged connection hole for connecting with the lower diagonal support rod is provided on the diagonal support rod connecting plate; The diagonal brace system is provided with a diagonal brace connecting plate, the lower end of the lower diagonal brace screw is connected to it through a hinged connection hole, the upper end of the lower diagonal brace screw is screwed to the steel sleeve through a thread, one end of the upper diagonal brace screw is sleeved with the steel sleeve, and the other end is connected to the stiffening angle steel through a hinged connection hole, and the stiffening angle steel is welded to the steel mold; The upper end of the steel sleeve is provided with a steel gasket and a nut.

2. The device for supporting corner forms during secondary concrete pouring at the intersection of precast beams and slabs as claimed in claim 1, characterized in that: The upper diagonal support screw rod is provided with a reserved hole, the reserved hole is aligned with the reserved hole on the wall of the steel sleeve, and is screwed and fixed by bolts.

3. The device for supporting corner forms during secondary concrete pouring at the intersection of precast beams and slabs as claimed in claim 1, characterized in that: The support adjustment device is provided with an angle steel, which is connected to the L-shaped pressure plate by bolts. The L-shaped pressure plate is provided with a wire sleeve with threads on both the inner and outer walls, and is fixed to the side of the L-shaped pressure plate by a nut; The push rod passes through the steel wire sleeve by means of a screw connection, and the right end thereof extends into the steel sleeve arranged on the side of the support back plate, and a push rod handle is welded on the left end thereof.

4. The device for supporting corner forms during secondary concrete pouring at the intersection of precast beams and slabs as claimed in claim 1, characterized in that: The steel formwork system is provided with a stiffening angle steel, which is welded to the steel formwork and the stiffening steel plate at the same time; A latch rod fixing piece is welded on the bottom side of the steel mold, a bolt rod is plugged into the latch rod fixing piece, and the bolt rod is welded to a latch rod handle fixing fastener.

5. A method for using the device for supporting corner formwork during secondary concrete pouring at the intersection of precast beams and slabs as described in any one of claims 1 to 4, characterized in that: The method of the device for supporting the corner formwork during the secondary concrete pouring at the intersection of the prefabricated beam and slab specifically comprises the following steps: Step 1: After the various components of the corner mold support system processed and manufactured in the factory are transported to the site, the horizontal support system, the corner mold and diagonal support screw system, and the internal force of the diagonal support screw are installed in sequence; Step 2: When installing the horizontal support system, two identical angle steels are combined into a steel beam using an angle steel connecting plate, and the diagonal support and the support adjustment device are installed on the steel beam. The lower diagonal support screw is successively connected to the steel sleeve and the support connecting plate, and then the L-shaped steel plate is fixed with expansion bolts on the side near the bottom of the prefabricated reinforced concrete beam, thereby forming a horizontal support system for the diagonal support screw; Step 3: When installing the angle form and the diagonal brace screw system, first weld the steel formwork and the stiffening angle steel, and at the same time, hinge the upper diagonal brace screw with bolts through the hinge connection hole, and then extend the upper diagonal brace screw into the steel sleeve; Step 4: After the horizontal support system, angle mold and diagonal support screw system are installed, start adjusting the internal force of the diagonal support screw.

6. The method for supporting the corner formwork during the secondary concrete pouring at the intersection of precast beams and slabs as claimed in claim 5, characterized in that: In step 4, the method for adjusting the internal force of the diagonal support screw includes: Method 1: Fix the support base plate and the composite steel beam with bolts at appropriate positions, and then adjust the internal force through the nuts on the upper diagonal support screw rods; Method 2: Insert the upper diagonal support screw into the steel sleeve and quickly connect the two with steel bolts; then turn the push rod handle to push the support forward through the push rod to the appropriate position and then fix it to the composite steel beam with bolts; Method three: Tighten the nut on the upper diagonal support screw, then turn the push rod handle, push the support forward through the push rod, and fix it to the combined steel beam with bolts to the appropriate position. Use the nut to fine-tune it during pushing to bring the support to the appropriate position.

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