A construction structure and method for increasing the cross-section of the bottom of a formwork-free concrete beam

Abstract

The present invention discloses a construction structure and method for increasing the cross-section of a concrete beam bottom without formwork, including a wedge-shaped box formwork, a box formwork self-supporting structure, and an openable and closable grouting hole structure; the wedge-shaped box formwork includes a box formwork outer formwork and a box formwork inner formwork, the box formwork outer formwork cooperates with the outer side of the box formwork inner formwork; the box formwork outer formwork is fixedly arranged on the original concrete beam structure through the box formwork self-supporting structure; the openable and closable grouting hole structure is arranged on the box formwork outer formwork, and the pouring, grouting stopping, and cleaning of concrete can be achieved through the openable and closable grouting holes. The present invention realizes the construction of increasing the cross-section of a concrete beam bottom without formwork, which can be vibrated, and is convenient for grouting, by providing a formwork-free wedge-shaped box formwork self-supporting structure; an openable and closable grouting hole structure; a concrete pouring fullness overflow detection hole structure; a vibrating structure; and a box formwork cross-section adjustable structure.

Description

Technical Field

[0001] The invention relates to the technical field of building construction engineering, and in particular to a construction structure and method for increasing the cross-section of a formwork-free concrete beam bottom. Background Art

[0002] With the development of history, the service life of the first batch of buildings in my country has begun to enter the middle and late stages, and a large number of existing old buildings are facing reinforcement. At the same time, my country has begun to vigorously promote building appearance management measures such as renovation of old residential areas and urban renewal in recent years. Now all provinces in the country are vigorously promoting the pace of old renovation to improve the safety and comfort of people's residential houses. Due to the improvement of building functions, the load borne by the main structure of the building will increase significantly. The current mainstream prefabricated interior can reduce the structural load to a certain extent, but due to the complexity of actual working conditions, the main structure of existing buildings often still needs to be reinforced after verification.

[0003] At present, the most common reinforcement scheme for concrete structures is to increase the cross-sectional area of ​​load-bearing components to improve the bearing capacity, and use the synergistic force of the new and old structures to complete the strength, stiffness and stability review of the components. However, in actual engineering construction, for increasing the cross-section of concrete beams, since the size of the increased cross-section is generally small, the amount of concrete used in a single component is small, the conventional formwork support system is complex, the formwork components are difficult to enter the house, the efficiency is low, and the ground cannot be constructed before demolding; at the same time, it is difficult to inject concrete into the formwork by pumping, and most of them are poured manually, with a dustpan opening reserved on the formwork to inject concrete. The beam is a horizontal component, and grouting is difficult, resulting in a large amount of concrete spillage and extremely low pouring efficiency; moreover, because the size of the formwork is limited, there is no construction surface of the vibrating rod or vibrating plate, and conventional vibration cannot be performed. The newly poured concrete is not dense, and the concrete pouring situation cannot be observed during the pouring process, which may cause the construction to be stopped due to insufficient concrete pouring, resulting in the joint surface of the new and old concrete after demolding is not tight, and there are many hidden dangers in the structural quality, which cannot achieve the effect of the synergistic force of the new and old structures in the theoretical calculation of structural engineering, making the application of the increased cross-section reinforcement scheme on concrete beams hindered. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a construction structure and method for increasing the cross-section of a formwork-free concrete beam bottom with a reasonable structural design.

[0005] The technical solution of the present invention is as follows:

[0006] A construction structure for increasing the cross-section of a concrete beam bottom without formwork, comprising a wedge-shaped box form, a box form self-supporting structure and an openable and closable grouting hole structure; the wedge-shaped box form comprises a box form outer form and a box form inner form, the box form outer form cooperates with the outer side of the box form inner form; the box form outer form is fixedly arranged on the original concrete beam structure through the box form self-supporting structure; the openable and closable grouting hole structure is arranged on the box form outer form, and the pouring, grouting stopping and cleaning of concrete can be achieved through the openable and closable grouting hole structure.

[0007] Furthermore, an insert groove is provided on the inner side of the outer mold of the box mold, an insert protrusion is provided on the outer side of the inner mold of the box mold, the outer mold of the box mold and the inner mold of the box mold are plugged together, and the side mold structure of the outer mold of the box mold is a wedge-shaped structure.

[0008] Furthermore, the box mold self-supporting structure adopts a suspension rod support structure, a suction cup rod support structure or a screw rod support structure;

[0009] The suspension rod support structure includes a suspension rod and a nut. The suspension rod is a telescopic rod. One end of the suspension rod is fixed to the original concrete beam structure, and the other end is fixed to the hanging ear of the outer mold of the box mold through a nut.

[0010] The suction cup rod support structure includes a suction cup and a fixing rod, wherein the suction cup is arranged at one end of the fixing rod, the fixing rod is passed through the outer mold of the box mold, and the suction cup is attached to the original concrete beam structure;

[0011] The screw support structure includes a reinforcement hoop, a tightening screw and a tightening nut. The reinforcement hoop matches the shape of the outer mold of the box mold. The tightening screw is inserted into the reinforcement hoop and the outer mold of the box mold. One end of the tightening screw is in contact with the original concrete beam structure, and the other end is locked on the outside of the reinforcement hoop by the tightening nut.

[0012] Furthermore, the openable and closable grouting hole structure includes a vertical grouting channel, a transverse grouting channel, a grouting stop plate, a grouting stop rod and a grouting lock rod; the vertical grouting channel penetrates the outer mold of the box mold from top to bottom, and the grouting stop rod is arranged at the bottom position of the vertical grouting channel, the transverse grouting channel penetrates the outer mold of the box mold and the side of the inner mold of the box mold, and the transverse grouting channel is connected with the vertical grouting channel, and a grouting stop plate adjustment channel parallel to the position of the vertical grouting channel is arranged on the outer mold of the box mold at the transverse grouting channel, the grouting stop plate is arranged in the grouting stop plate adjustment channel, and the grouting lock rod is arranged at the bottom position of the grouting stop plate adjustment channel.

[0013] Furthermore, a U-shaped grouting groove is provided on the top of the outer mold of the box mold to facilitate concrete pouring.

[0014] Furthermore, the connection between the vertical grouting channel and the horizontal grouting channel adopts an arc surface transition, and the grouting stop plate adopts an L-shaped structure.

[0015] A construction structure for increasing the cross-section of the bottom of a concrete beam without formwork, also includes a concrete pouring fullness overflow detection hole structure, the concrete pouring fullness overflow detection hole structure includes an overflow detection hole, a suspended pointer and a geophysical exploration module, the overflow detection hole is connected to the interior of the inner mold of the box mold, the geophysical exploration module is arranged in the overflow detection hole, and the geophysical exploration module is connected to the suspended pointer.

[0016] A construction structure for increasing the cross-section of a concrete beam bottom without formwork, further comprising a vibrating structure, wherein the vibrating structure adopts a contact vibrating structure or a formwork isolation vibrating structure;

[0017] The contact vibration structure includes a reserved channel, an upper telescopic rod, an upper opening and closing petal, a lower telescopic rod and a lower opening and closing petal, the reserved channel is arranged through the side molds of the inner mold of the box mold and the outer mold of the box mold, the upper telescopic rod is connected to the upper opening and closing petal, the lower telescopic rod is connected to the lower opening and closing petal, and the upper opening and closing petal and the lower opening and closing petal are arranged at the upper and lower positions of the inner mold of the box mold;

[0018] The mold separation vibration structure comprises reserved holes arranged on the side mold and the bottom mold of the outer mold of the box mold, and the mold separation vibration is performed by inserting a vibration rod into the reserved holes.

[0019] Furthermore, the bottom mold of the box mold outer mold adopts an adjustable box mold outer mold cross-section structure, and the structure is adjusted by pulling to adapt to different cross-section beam widths.

[0020] A construction method for a formwork-free concrete beam bottom cross-section enlargement construction structure comprises the following steps:

[0021] 1) Installation of wedge-shaped box formwork: Install the outer formwork of the box formwork at equal intervals on the axial direction of the inner formwork of the box formwork, and fix the outer formwork of the box formwork on the original concrete beam structure through the self-supporting structure of the box formwork;

[0022] 1.1) When the hanger support structure is adopted, the wedge-shaped box formwork is hung on the original concrete beam structure by the hanger at the upper end. According to the reinforcement height of the bottom of the beam, the position of the wedge-shaped box formwork is adjusted by the hanger; the lower end of the hanger is connected to the box-shaped side formwork hanging ear, and two upper and lower nuts are set at the hanging ear to fix the position;

[0023] 1.2) When the screw support structure is adopted, a reinforcement hoop is set on the outside of the wedge-shaped box formwork. The tightening screw is passed through the wedge-shaped box formwork and the reinforcement hoop, and is locked on the outside of the reinforcement hoop by tightening the nut to strengthen the friction between the wedge-shaped box formwork and the original concrete beam structure to resist the deadweight of the newly poured concrete;

[0024] 1.3) Using a suction cup rod support structure, multiple trumpet-shaped suction cups are set on the side mold of the wedge-shaped box mold close to the concrete surface, and the fixing rods on the suction cups are passed through the wedge-shaped box mold. The air is pumped to reduce the atmospheric pressure, generate a pressure difference, and then the box mold is fixed by suction;

[0025] 2) Concrete pouring:

[0026] During pouring, tighten the stop grouting rod to close the vertical grouting channel, open the lock grouting rod, open the horizontal grouting channel, and inject concrete into the inner mold of the box mold through the horizontal grouting channel; after the concrete pouring is completed, immediately tighten the lock grouting rod, close the horizontal grouting channel, open the stop grouting rod, keep the vertical grouting channel unobstructed, and use the cleaning fluid to quickly clean the concrete in the vertical grouting channel to prevent the concrete from solidifying in the channel and causing channel blockage; during the mold maintenance process, tighten the stop grouting rod again, use the lateral force provided by the stop grouting rod to strengthen the restraining ability of the stop grouting sheet to prevent concrete overflow;

[0027] 3) Concrete pouring fullness overflow detection:

[0028] When the concrete is poured to the bottom of the existing beam, the concrete pushes the geophysical exploration module, causing the suspended pointer in the overflow detection hole to float, indicating that the concrete construction volume has reached the requirement, and the concrete pouring can be stopped. The elevation of the overflow detection hole is higher than the elevation of the top surface of the grouting tank to prevent the concrete or cleaning fluid from contaminating the overflow detection hole;

[0029] 4) Concrete vibration:

[0030] 4.1) When the reinforced concrete section is small, it is difficult for the vibrator to enter the concrete for construction. At this time, the reserved holes on the side and bottom molds of the outer mold of the box mold are used to directly use the vibrator to vibrate the mold to increase the density of the concrete;

[0031] 4.2) When the cross-section of the reinforced concrete is large and the vibration effect of the mold separation is poor, a vibrating rod is used to enter the concrete for vibration construction. At this time, the side mold reserved channels of the outer mold and the inner mold of the box mold are used, and the vibrating rod directly opens the upper and lower opening and closing petals, and the upper and lower opening and closing petals are respectively connected to the upper and lower telescopic rods; after the vibration is completed, the vibrating rod is taken out, and the upper and lower telescopic rods pop out, automatically closing the upper and lower opening and closing petals, closing the reserved channels, and preventing concrete from overflowing.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1) The self-supporting structure of the box formwork is set up to achieve the goal of eliminating the need for formwork, thus reducing the formwork construction process and costs.

[0034] 2) The openable and closable grouting hole structure is set to facilitate grouting, speed up pouring efficiency, reduce concrete loss, and at the same time, the grouting hole can be cleaned, which is conducive to secondary use.

[0035] 3) By setting up a vibrating structure, contact vibration or isolation vibration can be achieved to increase the density of concrete and ensure the quality of the structure.

[0036] 4) By setting up an adjustable structure for the cross-section of the outer mold of the box mold, the cross-section of the box mold can be adjusted, and the cross-section of the beam bottom reinforcement has good adaptability.

[0037] 5) The concrete pouring fullness overflow detection hole structure is set to facilitate observation of whether the concrete construction volume meets the requirements and ensure the concrete pouring fullness.

[0038] 6) The present invention realizes the construction of an enlarged cross-section of the bottom of a concrete beam that does not require formwork, can be vibrated, and is convenient for grouting by setting up a self-supporting structure of a wedge-shaped box formwork that does not require formwork; an openable and closable grouting hole structure; a concrete pouring fullness overflow detection hole structure; a vibrating structure; and a box formwork cross-section adjustable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0040] Figure 2 It is a schematic diagram of the top view structure of the present invention;

[0041] Figure 3 It is a schematic diagram of the overall structure of the wedge-shaped box mold of the present invention;

[0042] Figure 4 It is a schematic diagram of concrete pouring construction of the present invention;

[0043] Figure 5 This is a schematic diagram of the pouring and cleaning construction of the present invention;

[0044] Figure 6 It is a schematic diagram of the belt formwork curing construction of the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of the openable and closable grouting hole of the present invention;

[0046] Figure 8 It is a schematic diagram of the suspension rod support structure of the present invention;

[0047] Fig. 9 It is a schematic diagram of the sucker rod support structure of the present invention;

[0048] Fig.10 It is a schematic diagram of the screw support structure of the present invention;

[0049] Fig.11 It is a schematic diagram of the contact vibration structure of the present invention;

[0050] Fig.12 It is a schematic diagram of the isolation mold vibration structure of the present invention;

[0051] Fig.13 This is an enlarged view of the structure at A of the present invention;

[0052] Fig.14 This is a diagram showing the upper and lower opening and closing flaps of the present invention in a closed state;

[0053] In the figure: 1. Original concrete beam structure; 2. Box mold inner mold; 3. Box mold outer mold; 301. Insertion groove; 302. U-shaped grouting groove; 4. Openable and closable grouting hole structure; 401. Vertical grouting channel; 402. Horizontal grouting channel; 403. Stop grouting plate adjustment channel; 404. Stop grouting rod; 405. Locking grouting rod; 406. Stop grouting plate; 5. Concrete pouring fullness overflow detection hole structure; 501. Overflow detection hole; 502. Suspended pointer; 503. Geophysical exploration module; 6. Suspension rod support structure; 601. Suspension rod; 602. Nut; 7. Suction cup rod support structure; 701. Suction cup; 702. Fixing rod; 8. Screw rod support structure; 801. Tighten the screw rod; 802. Tighten the nut; 803. Reinforcement clamp; 9. Contact vibration structure; 901. Upper opening and closing petal; 902. Upper telescopic rod; 903. Lower opening and closing petal; 904. Lower telescopic rod; 905. Reserved channel; 10. Dividing mold vibration structure; 1001. Reserved hole; 11. Vibrating rod. DETAILED DESCRIPTION

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] like Figure 1-14 As shown, a construction structure for increasing the cross-section of the bottom of a formwork-free concrete beam comprises a wedge-shaped box form, a box form self-supporting structure, an openable and closable grouting hole structure, a concrete pouring filling degree overflow detection hole structure, a vibrating structure and a box form outer formwork cross-section adjustable structure;

[0056] The wedge-shaped box mold comprises a box mold outer mold 3 and a box mold inner mold 2. The box mold outer mold 3 matches the outer side of the box mold inner mold 2, and the box mold outer mold 3 is arranged at equal intervals along the axial direction of the box mold inner mold 2.

[0057] An inserting groove 301 is provided on the inner side of the box mold outer mold 3, and an inserting protrusion 201 is provided on the outer side of the box mold inner mold 2. The box mold outer mold 3 and the box mold inner mold 2 are plugged together, and the side mold structure of the box mold outer mold 3 is a wedge-shaped structure; a U-shaped grouting groove 302 is provided on the top of the box mold outer mold 3, which can reduce concrete spillage and facilitate concrete pouring.

[0058] The box formwork outer formwork 3 is fixedly arranged on the original concrete beam structure 1 through the box formwork self-supporting structure;

[0059] The box mold self-supporting structure adopts a suspension rod support structure 6, a suction cup rod support structure 7 or a screw rod support structure 8;

[0060] If the house adopts a suspended ceiling structure in the later stage (generally in this case, the load is large), a hanger support structure 6 is adopted. The hanger support structure 6 includes a hanger 601 and a nut 602. The hanger 601 adopts a telescopic rod. One end of the hanger 601 is fixed to the original concrete beam structure 1, and the other end is fixed to the hanging ear of the box mold outer mold 3 through a nut 602; the hanger has a telescopic and tightening function, and the template position can be adjusted according to the reinforcement height of the beam bottom.

[0061] If the original concrete beam structure is plain concrete or has a very high surface flatness, a suction cup rod support structure 7 is used. The suction cup rod support structure 7 includes a suction cup 701 and a fixing rod 702. The suction cup 701 is arranged at one end of the fixing rod 702. The fixing rod 702 is penetrated through the outer mold 3 of the box mold, and the suction cup 701 is attached to the original concrete beam structure 1. Air is exhausted to reduce the atmospheric pressure, generate a pressure difference, and then use suction to fix the box mold. Inflation is used to increase the suction cup pressure, reduce the pressure difference, and then generate impact force to achieve demolding.

[0062] In addition, under most working conditions, the present invention provides a general solution of a screw support structure 8, which includes a reinforcing hoop 803, a tightening screw 801 and a tightening nut 802. The reinforcing hoop 803 matches the shape of the box mold outer mold 3, and the tightening screw 801 is inserted into the reinforcing hoop 803 and the box mold outer mold 3. One end of the tightening screw 801 is in contact with the original concrete beam structure 1, and the other end is locked on the outside of the reinforcing hoop 803 by the tightening nut 802; the tightening screw is used to strengthen the friction between the box mold and the concrete beam (the principle is synchronous tightening) to resist the deadweight of the newly poured concrete.

[0063] The openable and closable grouting hole structure 4 includes a vertical grouting channel 401, a transverse grouting channel 402, a grouting stop plate 406, a grouting stop rod 404 and a grouting lock rod 405; the vertical grouting channel 401 penetrates the box mold outer mold 3 from top to bottom, and the grouting stop rod 404 is arranged at the bottom position of the vertical grouting channel 401, the transverse grouting channel 402 penetrates the box mold outer mold 3 and the side of the box mold inner mold 2, and the transverse grouting channel 402 is connected with the vertical grouting channel 401, and a grouting stop plate adjustment channel 403 parallel to the position of the vertical grouting channel 401 is arranged on the box mold outer mold 3 at the transverse grouting channel 402, the grouting stop plate 406 is arranged in the grouting stop plate adjustment channel 403, and the grouting lock rod 405 is arranged at the bottom position of the grouting stop plate adjustment channel 403; in this embodiment, the connection between the vertical grouting channel 401 and the transverse grouting channel 402 adopts an arc surface transition, and the grouting stop plate 406 adopts an L-shaped structure.

[0064] The concrete pouring fullness overflow detection hole structure 5 includes an overflow detection hole 501, a suspended pointer 502 and a geophysical module 503. The overflow detection hole 501 is connected to the inside of the box mold inner mold 2. The geophysical module 503 is arranged in the overflow detection hole 501, and the geophysical module 503 is connected to the suspended pointer 502. When the concrete is poured to the bottom of the existing beam, the concrete pushes the geophysical module, causing the suspended pointer in the detection hole to float, which means that the concrete construction volume has reached the requirement and the concrete pouring can be stopped.

[0065] The vibrating structure adopts a contact vibrating structure 9 or a mold isolation vibrating structure 10;

[0066] When the reinforced concrete section is large and the isolation vibration effect is poor, the vibrating rod enters the concrete for vibration construction, and a contact vibration structure 9 is adopted. The contact vibration structure 9 includes a reserved channel 905, an upper telescopic rod 902, an upper opening and closing petal 901, a lower telescopic rod 904 and a lower opening and closing petal 903. The reserved channel 905 is set on the side molds of the box mold inner mold 2 and the box mold outer mold 3. The upper telescopic rod 902 is connected to the upper opening and closing petal 901, and the lower telescopic rod 904 is connected to the lower opening and closing petal 903. The opening and closing flaps 903 are connected, and the upper opening and closing flaps 901 and the lower opening and closing flaps 903 are arranged at the upper and lower positions of the inner mold 2 of the box mold; the upper telescopic rod 902 and the lower telescopic rod 904 are elastic structures and can be automatically reset, and the upper opening and closing flap 901 and the upper telescopic rod 902 and the lower opening and closing flap 903 and the lower telescopic rod 904 are movably connected through torsion springs, so that they can automatically flip over after the vibrating rod 11 is inserted, and automatically reset after the vibrating rod 11 is withdrawn, blocking the reserved channel 905.

[0067] When the cross-section of the reinforced concrete is small, it is difficult for the vibrating rod to enter the concrete for construction. A mold separation vibration structure 10 is used. The mold separation vibration structure 10 includes reserved holes 1001 set on the side mold and the bottom mold of the box mold outer mold 3. The vibrating rod is inserted into the reserved hole 1001 to perform mold separation vibration.

[0068] The size of the inner mold of the box mold is fixed, and the bottom mold of the outer mold of the box mold 3 adopts an adjustable box mold outer mold section structure, specifically a pull-out adjustment structure (similar to a pull-out box), which is suitable for different cross-sectional beam widths and improves adaptability.

[0069] A construction method for a formwork-free concrete beam bottom with an increased cross-section construction structure, the specific steps are as follows:

[0070] 1) Installation of wedge-shaped box formwork: Install the outer formwork of the box formwork at equal intervals on the axial direction of the inner formwork of the box formwork, and fix the outer formwork of the box formwork on the original concrete beam structure through the self-supporting structure of the box formwork;

[0071] 1.1) When the hanger support structure is adopted, the wedge-shaped box formwork is hung on the original concrete beam structure by the hanger at the upper end. According to the reinforcement height of the bottom of the beam, the position of the wedge-shaped box formwork is adjusted by the hanger; the lower end of the hanger is connected to the box-shaped side formwork hanging ear, and two upper and lower nuts are set at the hanging ear to fix the position;

[0072] 1.2) When the screw support structure is adopted, a reinforcement hoop is set on the outside of the wedge-shaped box formwork. The tightening screw is passed through the wedge-shaped box formwork and the reinforcement hoop, and is locked on the outside of the reinforcement hoop by tightening the nut to strengthen the friction between the wedge-shaped box formwork and the original concrete beam structure to resist the deadweight of the newly poured concrete;

[0073] 1.3) A suction cup rod support structure is used. Multiple trumpet-shaped suction cups are set on the side mold of the wedge-shaped box mold close to the concrete surface, and the fixing rods on the suction cups are passed through the wedge-shaped box mold. The atmospheric pressure is reduced by exhausting air, a pressure difference is generated, and the box mold is fixed by suction. In addition, the suction cup rod support structure uses inflation to increase the suction cup pressure, reduce the pressure difference, and generate impact force to achieve demoulding.

[0074] 2) Concrete pouring:

[0075] During pouring, tighten the stop grouting rod to close the vertical grouting channel, open the lock grouting rod, open the horizontal grouting channel, and inject concrete into the inner mold of the box mold through the horizontal grouting channel; after the concrete pouring is completed, immediately tighten the lock grouting rod, close the horizontal grouting channel, open the stop grouting rod, keep the vertical grouting channel unobstructed, and use the cleaning fluid to quickly clean the concrete in the vertical grouting channel to prevent the concrete from solidifying in the channel and causing channel blockage; during the mold maintenance process, tighten the stop grouting rod again, use the lateral force provided by the stop grouting rod to strengthen the restraining ability of the stop grouting sheet to prevent concrete overflow;

[0076] 3) Concrete pouring fullness overflow detection:

[0077] When the concrete is poured to the bottom of the existing beam, the concrete pushes the geophysical exploration module, causing the suspended pointer in the overflow detection hole to float, indicating that the concrete construction volume has reached the requirement, and the concrete pouring can be stopped. The elevation of the overflow detection hole is higher than the elevation of the top surface of the grouting tank to prevent the concrete or cleaning fluid from contaminating the overflow detection hole;

[0078] 4) Concrete vibration:

[0079] 4.1) When the reinforced concrete section is small, it is difficult for the vibrator to enter the concrete for construction. At this time, the reserved holes on the side and bottom molds of the outer mold of the box mold are used to directly use the vibrator to vibrate the mold to increase the density of the concrete;

[0080] 4.2) When the cross-section of the reinforced concrete is large and the vibration effect of the mold separation is poor, a vibrating rod is used to enter the concrete for vibration construction. At this time, the side mold reserved channels of the outer mold and the inner mold of the box mold are used, and the vibrating rod directly opens the upper and lower opening and closing petals, and the upper and lower opening and closing petals are respectively connected to the upper and lower telescopic rods; after the vibration is completed, the vibrating rod is taken out, and the upper and lower telescopic rods pop out, automatically closing the upper and lower opening and closing petals, closing the reserved channels, and preventing concrete from overflowing.

[0081] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A construction structure for increasing the cross-section of a concrete beam bottom without formwork, characterized in that: It comprises a wedge-shaped box mold, a box mold self-supporting structure and an openable and closable grouting hole structure (4); the wedge-shaped box mold comprises a box mold outer mold (3) and a box mold inner mold (2), the box mold outer mold (3) cooperates with the outer side of the box mold inner mold (2); the box mold outer mold (3) is fixedly arranged on the original concrete beam structure (1) through the box mold self-supporting structure; the openable and closable grouting hole structure (4) is arranged on the box mold outer mold (3), and the pouring, grouting and cleaning of concrete can be achieved through the openable and closable grouting hole structure (4); The openable and closable grouting hole structure (4) comprises a vertical grouting channel (401), a horizontal grouting channel (402), a grouting stop plate (406), a grouting stop rod (404) and a grouting lock rod (405); the vertical grouting channel (401) penetrates the outer mold of the box mold (3) from top to bottom, and the grouting stop rod (404) is arranged at the bottom position of the vertical grouting channel (401); the horizontal grouting channel (402) penetrates the outer mold of the box mold (3) and the inner mold of the box mold; The box mold (2) is disposed on the side of the box mold, and the transverse grouting channel (402) is connected to the vertical grouting channel (401); a stop grouting plate adjustment channel (403) parallel to the vertical grouting channel (401) is provided on the box mold outer mold (3) at the transverse grouting channel (402); the stop grouting plate (406) is provided in the stop grouting plate adjustment channel (403); and the locking grouting rod (405) is provided at the bottom of the stop grouting plate adjustment channel (403).

2. A formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: The inner side of the box mold outer mold (3) is provided with an inserting groove (301), the outer side of the box mold inner mold (2) is provided with an inserting protrusion (201), the box mold outer mold (3) and the box mold inner mold (2) are plug-fitted, and the side mold structure of the box mold outer mold (3) is a wedge-shaped structure.

3. A formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: The box mold self-supporting structure adopts a suspension rod support structure (6), a suction cup rod support structure (7) or a screw rod support structure (8); The suspension rod support structure (6) comprises a suspension rod (601) and a nut (602); the suspension rod (601) is a telescopic rod; one end of the suspension rod (601) is fixed to the original concrete beam structure (1), and the other end is fixed to the hanging ear of the box mold outer mold (3) through the nut (602); The suction cup rod support structure (7) comprises a suction cup (701) and a fixing rod (702), wherein the suction cup (701) is arranged at one end of the fixing rod (702), the fixing rod (702) is passed through the outer mold of the box mold (3), and the suction cup (701) is attached to the original concrete beam structure (1); The screw rod support structure (8) comprises a reinforcing hoop (803), a tightening screw rod (801) and a tightening nut (802); the reinforcing hoop (803) matches the shape of the box mold outer mold (3); the tightening screw rod (801) is inserted into the reinforcing hoop (803) and the box mold outer mold (3); one end of the tightening screw rod (801) is in contact with the original concrete beam structure (1); and the other end is locked to the outside of the reinforcing hoop (803) by means of the tightening nut (802).

4. The formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: A U-shaped grouting groove (302) is provided on the top of the box mold outer mold (3) to facilitate concrete pouring.

5. The formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: The connection between the vertical grouting channel (401) and the horizontal grouting channel (402) adopts an arc-shaped surface transition, and the grout-stopping plate (406) adopts an L-shaped structure.

6. The formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: It also comprises a concrete pouring fullness overflow detection hole structure (5), the concrete pouring fullness overflow detection hole structure (5) comprising an overflow detection hole (501), a suspended pointer (502) and a geophysical detection module (503), the overflow detection hole (501) being connected to the interior of the box mold inner mold (2), the geophysical detection module (503) being arranged in the overflow detection hole (501), and the geophysical detection module (503) being connected to the suspended pointer (502).

7. The formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: It also includes a vibrating structure, wherein the vibrating structure adopts a contact vibrating structure (9) or a mold isolation vibrating structure (10); The contact vibration structure (9) comprises a reserved channel (905), an upper telescopic rod (902), an upper opening and closing flap (901), a lower telescopic rod (904) and a lower opening and closing flap (903); the reserved channel (905) is arranged through the side molds of the box mold inner mold (2) and the box mold outer mold (3); the upper telescopic rod (902) is connected to the upper opening and closing flap (901), the lower telescopic rod (904) is connected to the lower opening and closing flap (903), and the upper opening and closing flap (901) and the lower opening and closing flap (903) are arranged at upper and lower positions of the box mold inner mold (2); The mold separation vibration structure (10) comprises reserved holes (1001) arranged on the side molds and the bottom mold of the box mold outer mold (3), and the mold separation vibration is performed by inserting a vibration rod into the reserved hole (1001).

8. The formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: The bottom mold of the box mold outer mold (3) adopts a box mold outer mold cross-section adjustable structure, and the structure is adjusted by pulling and pulling to adapt to different cross-section beam widths.

9. The construction method of the formwork-free concrete beam bottom cross-section enlargement construction structure according to claim 1, characterized in that: The steps include: 1) Installation of wedge-shaped box formwork: Install the outer formwork of the box formwork at equal intervals on the axial direction of the inner formwork of the box formwork, and fix the outer formwork of the box formwork on the original concrete beam structure through the self-supporting structure of the box formwork; 1.1) When the hanger support structure is adopted, the wedge-shaped box formwork is hung on the original concrete beam structure by the hanger at the upper end. According to the reinforcement height of the bottom of the beam, the position of the wedge-shaped box formwork is adjusted by the hanger; the lower end of the hanger is connected to the box-shaped side formwork hanging ear, and two upper and lower nuts are set at the hanging ear to fix the position; 1.2) When the screw support structure is adopted, a reinforcement hoop is set on the outside of the wedge-shaped box formwork. The tightening screw is passed through the wedge-shaped box formwork and the reinforcement hoop, and is locked on the outside of the reinforcement hoop by tightening the nut to strengthen the friction between the wedge-shaped box formwork and the original concrete beam structure to resist the deadweight of the newly poured concrete; 1.3) Using a suction cup rod support structure, multiple trumpet-shaped suction cups are set on the side mold of the wedge-shaped box mold close to the concrete surface, and the fixing rods on the suction cups are passed through the wedge-shaped box mold. The air is pumped to reduce the atmospheric pressure, generate a pressure difference, and then the box mold is fixed by suction; 2) Concrete pouring: During pouring, tighten the stop grouting rod to close the vertical grouting channel, open the lock grouting rod, open the horizontal grouting channel, and inject concrete into the inner mold of the box mold through the horizontal grouting channel; after the concrete pouring is completed, immediately tighten the lock grouting rod, close the horizontal grouting channel, open the stop grouting rod, keep the vertical grouting channel unobstructed, and use the cleaning fluid to quickly clean the concrete in the vertical grouting channel to prevent the concrete from solidifying in the channel and causing channel blockage; during the mold maintenance process, tighten the stop grouting rod again, use the lateral force provided by the stop grouting rod to strengthen the restraining ability of the stop grouting sheet to prevent concrete overflow; 3) Concrete pouring fullness overflow detection: When the concrete is poured to the bottom of the existing beam, the concrete pushes the geophysical exploration module, causing the suspended pointer in the overflow detection hole to float, indicating that the concrete construction volume has reached the requirement, and the concrete pouring can be stopped. The elevation of the overflow detection hole is higher than the elevation of the top surface of the grouting tank to prevent the concrete or cleaning fluid from contaminating the overflow detection hole; 4) Concrete vibration: 4.1) When it is difficult for the vibrator to enter the concrete for construction, at this time, use the reserved holes on the side form and bottom form of the box formwork to directly use the vibrator to vibrate through the formwork to increase the density of the concrete; 4.2) When the vibration effect of the separated formwork is not good, a vibrating rod is used to enter the concrete for vibration construction. At this time, the side mold reserved channels of the outer mold and the inner mold of the box mold are used, and the vibrating rod directly opens the upper and lower opening and closing petals, and the upper and lower opening and closing petals are respectively connected to the upper and lower telescopic rods; after the vibration is completed, the vibrating rod is taken out, and the upper and lower telescopic rods pop out, automatically closing the upper and lower opening and closing petals, closing the reserved channels, and preventing concrete from overflowing.

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