Prestressed bearing platform of column-holding ground type bent cap bearing formwork frame

Abstract

The utility model relates to a prestress bearing platform of a hug column floor type bent cap bearing formwork support, including bearing platform, the bearing platform includes hug column steel ring and support platform, support platform is equipped with two and sets up in the both sides of hug column steel ring respectively, and the side of two support platforms all is equipped with counterforce beam, is equipped with the counter hole on the counterforce beam, and the counter hole on two counterforce beams is opposite distribution, and the counter hole is inserted with the counter pull prestressed reinforcement between two counterforce beams, and the counter pull prestressed reinforcement passes through opposite distribution counter hole and fixes on the counterforce beam, and the counter pull prestressed reinforcement is located the both sides of bearing platform, the utility model discloses a counterforce beam and inserts and fixes the counter pull prestressed reinforcement between the counterforce beam through setting up on the bearing platform, has the advantage that the bearing capacity promotes greatly, installation is simple, safe and reliable and simple to make under the prerequisite of not changing the bearing platform structure design, to promote the bearing capacity of bearing platform.

Description

Technical Field

[0001] This utility model belongs to the technical field of support platforms in engineering construction, and in particular relates to a prestressed load-bearing platform for a column-mounted, ground-supported cap beam formwork support. Background Technology

[0002] Generally, when the size of the cap beam is small, the cap beam of the bridge pier often adopts the process of casting in place with clamps and load-bearing formwork, which simplifies the construction process, avoids the erection of ground scaffolding, and saves the cost of foundation treatment and scaffolding erection.

[0003] However, when the weight of the cap beam is large and conventional clamps cannot meet the load-bearing requirements, a large-scale foundation treatment + foundation + ground-supported load-bearing formwork casting process is often adopted. The following problems will be encountered during construction: 1) Uneconomical: Large-scale foundation treatment will result in a large consumption of personnel, machinery and materials, which is not economical; 2) Long construction period: Foundation treatment, preloading and scaffolding erection will waste a lot of time, which will inevitably extend the construction period; 3) Not environmentally friendly: The treated foundation will inevitably produce a large amount of solid waste, which does not conform to the current concept of sustainable development, green and environmental protection.

[0004] Therefore, a load-bearing platform for a column-supported ground-mounted cap beam formwork support was developed. However, the maximum allowable load-bearing capacity of a single column-supported ground-mounted cap beam formwork support is 500T. When the load continues to increase, the steel ring of the column-supporting platform will undergo a "V"-shaped deformation from the upper edge to the lower edge until it fails, making it unable to continue to bear a larger load without changing the structural design. Summary of the Invention

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a prestressed load-bearing platform for a column-supported ground-mounted girder formwork support frame that can not meet the load of more than 500T. Without changing the structural design, the load-bearing platform's column steel ring variable load threshold is increased by setting external prestressing, thereby improving the load-bearing capacity of the load-bearing platform.

[0006] The purpose of this utility model is achieved through the following technical solution: the prestressed load-bearing platform of this column-supported ground-mounted cap beam formwork includes a load-bearing platform, which includes a column-supporting steel ring and a support platform. Two support platforms are provided and respectively located on both sides of the column-supporting steel ring. Each of the two support platforms has a reaction beam on its side. The reaction beam has tie holes, and the tie holes on the two reaction beams are relatively distributed. Tie prestressed steel bars are inserted between the two reaction beams, and the tie prestressed steel bars pass through the relatively distributed tie holes and are fixed on the reaction beams. The tie prestressed steel bars are located on both sides of the load-bearing platform.

[0007] The beneficial effects of this utility model are as follows: Compared with the prior art, by setting reaction beams on the load-bearing platform and inserting and fixing tension prestressed steel bars between the reaction beams, the load-bearing capacity is greatly improved, the installation is simple, the safety and reliability are high, and the manufacturing is simple, without changing the structural design of the load-bearing platform, thereby improving the load-bearing capacity of the load-bearing platform.

[0008] Preferably, the prestressed steel bars are provided in a plurality of lengths and are distributed at equal intervals along the height direction of the load-bearing platform, and the number of prestressed steel bars on both sides of the load-bearing platform is equal; the above structure makes the tensile force stronger and the stress more stable and balanced.

[0009] Preferably, the tension prestressed steel bars are threaded steel bars, and their ends are tightened and fixed to the reaction beam by anchor nuts, with a pad sandwiched between the anchor nuts and the reaction beam; with the above structure, the installation is simple and safe.

[0010] Preferably, the reaction beam is composed of several I-beams spliced ​​together along the height direction of the load-bearing platform, and the tie holes are located at the splicing points of adjacent I-beams; it is simple to manufacture, all materials are common materials on the market and easy to purchase, and it can be put into use after simple on-site processing. Moreover, the tie holes are located at the splicing points of adjacent I-beams, which provides better tie effect and stronger stability.

[0011] Preferably, the column-holding steel ring consists of two semi-circular steel rings. Each steel ring has connecting ear units on its two outer side walls at the open end. The two steel rings are fixed together by bolts through their respective connecting ear units. A support platform is welded to the outer side wall of each steel ring. The height of the support platform and the height of the connecting ear units are equal to the height of the column-holding steel ring. By setting up the column-holding steel ring and providing support platforms on both sides, and by fixing the column-holding steel ring to the column with bolts through two steel rings, it serves as a support platform for the cap beam formwork. This design offers advantages such as high load-bearing capacity, easy installation, safety and reliability, and economic and environmental benefits.

[0012] Preferably, the connecting ear unit includes a connecting ear plate and a stiffening plate. The connecting ear plate is fixed to the outer wall of the opening end of the steel ring by welding, and the connecting ear plate has several bolt holes. Several stiffening plates are provided and fixed between the connecting ear plate and the outer wall of the steel ring by welding, and the stiffening plates are arranged along the height direction of the connecting ear plate and are evenly distributed. With the above structure, the structure is relatively simple to form and has good strength, which makes the bearing capacity between the column-holding steel ring and the column better.

[0013] Preferably, the support platform includes vertical load-bearing ribs, grating stiffening plates, and surface steel plates. Two surface steel plates are provided and fixed to the outer wall of the steel ring by welding, with the two surface steel plates flush with the upper and lower ends of the steel ring, respectively. The vertical load-bearing ribs are fixed between the two surface steel plates by welding, and the grating stiffening plates are fixed between the two vertical load-bearing ribs by welding. This structural design not only facilitates molding but also improves load-bearing capacity.

[0014] Preferably, the vertical load-bearing ribs are provided in several pieces, and adjacent vertical load-bearing ribs are welded together sequentially along the height direction of the support platform; in this way, the modular splicing of the vertical load-bearing ribs can be set according to the height of the support platform, which makes construction more convenient, and the height can be predetermined according to the actual situation.

[0015] Preferably, the grating stiffening plate is provided in several pieces, which are fixed between adjacent vertical load-bearing ribs along the width direction of the support platform, and the several pieces of the grating stiffening plate together form a stiffening plate with the same shape as the surface steel plate; through the above structure, modular splicing between the grating stiffening plates is realized, which facilitates construction and the forming of the support platform. Attached Figure Description

[0016] Figure 1 This is a top view structural diagram of the prestressed load-bearing platform of this utility model.

[0017] Figure 2 yes Figure 1 A schematic diagram of the AA cross-sectional structure.

[0018] Figure 3 yes Figure 1 A schematic diagram of the BB cross-sectional structure.

[0019] Figure 4 This is a schematic diagram of the main structure of the load-bearing platform of this utility model.

[0020] Figure 5This is a top view schematic diagram of the load-bearing platform of this utility model.

[0021] Figure 6 This is a schematic diagram of the structure between the steel ring and the connecting ear unit of this utility model.

[0022] Figure 7 This is a schematic diagram of the main structure of the load-bearing platform of this utility model in actual application.

[0023] The labels in the attached diagram are as follows: 1. Column retaining ring; 2. Connecting ear unit; 3. Support platform; 4. Column; 5. Pile head; 6. Concrete; 7. Reaction beam; 8. Tension prestressed steel reinforcement; 9. Anchor nut; 10. Washer plate; 11. Steel ring; 12. Support column; 21. Connecting ear plate; 22. Stiffening plate; 23. Bolt hole; 31. Vertical load-bearing rib; 32. Grating stiffening plate; 33. Surface steel plate; 71. Tie hole; 72. I-beam. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings: as shown in the drawings Figures 1 to 3 As shown, this utility model includes a load-bearing platform, which comprises a column-holding steel ring 1 and a support platform 3. Two support platforms 3 are provided, respectively located on both sides of the column-holding steel ring 1. Each support platform 3 has a reaction beam 7 on its side, with tie holes 71 on the reaction beams 7. The tie holes 71 on the two reaction beams 7 are arranged oppositely. Tension prestressed steel bars 8 are inserted between the two reaction beams 7, passing through the oppositely arranged tie holes 71 and fixed to the reaction beams 7. The tension prestressed steel bars 8 are located on both sides of the load-bearing platform. Support columns 12 used for the cap beam formwork are placed on the support platform 3. Several advantages of this utility model are: 1. Significantly increased load-bearing capacity: The maximum allowable load-bearing capacity of a single load-bearing platform has been increased from 500T to 1200T; 2. Easy and safe installation: Installation can be completed on the ground within 1.5 hours using one 25T truck crane and two skilled workers; 3. Simple to make: All materials are common in the market and easy to purchase. They can be put into use after simple on-site processing.

[0025] Several tension prestressed steel bars 8 are provided and are distributed at equal intervals along the height direction of the load-bearing platform, and the number of tension prestressed steel bars 8 on both sides of the load-bearing platform is equal.

[0026] The tension prestressed steel bar 8 is a threaded steel bar, and its end is fixed to the reaction beam 7 by an anchor nut 9. A pad 10 is sandwiched between the anchor nut 9 and the reaction beam 7. The center of the pad 10 has a through hole for the threaded steel bar to pass through.

[0027] The reaction beam 7 is composed of several I-beams 72 spliced ​​together along the height direction of the load-bearing platform, and the tie holes 71 are set at the splicing points of adjacent I-beams 72.

[0028] After the load-bearing platform is installed on the column 4, the prestressed steel bars 8 are inserted one by one into the tie holes 71 between the two reaction beams 7, and the two ends are padded with pads 10 and anchored with anchor nuts 9.

[0029] As attached Figures 4 to 7 As shown, the column-holding steel ring 1 consists of two semi-circular steel rings 11. Each steel ring 11 has connecting ear units 2 on its two outer side walls at the open end. The two steel rings 11 are fixed together by bolts through their respective connecting ear units 2 to form the column-holding steel ring 1. A support platform 3 is welded to the outer side wall of each steel ring 11. The height of the support platform 3 and the height of the connecting ear units 2 are equal to the height of the column-holding steel ring 1. The permanent structure bears the load transferred from the upper structure to the load-bearing platform. The load-bearing platform uses the treated interface between the pile foundation and the column as the stress point to transfer the load downwards to the permanent structure pile foundation. The friction force between the column-holding steel ring 1 and the column 4 serves only as a safety reserve. Its effect is: 1. High load-bearing capacity: The maximum allowable load-bearing capacity of a single load-bearing platform is 500T; 2. Easy and safe installation: Installation can be completed on the ground within 2 hours using one 25T truck crane and two skilled workers, avoiding high-altitude installation work; 3. Economic and environmental benefits: Since the load-bearing platform fully utilizes the load-bearing capacity of the permanent structure, there is no need for large-scale foundation treatment, and no solid waste is generated, resulting in significant economic and environmental benefits.

[0030] The connecting ear unit 2 includes a connecting ear plate 21 and a stiffening plate 22. The connecting ear plate 21 is fixed to the outer wall of the opening end of the steel ring 11 by welding, and a number of bolt holes 23 are provided on the connecting ear plate 21. A number of stiffening plates 22 are provided and fixed between the connecting ear plate 21 and the outer wall of the steel ring 11 by welding, and the number of stiffening plates 22 are arranged along the height direction of the connecting ear plate 21 and are distributed at equal intervals.

[0031] The connecting lugs 21 are symmetrically distributed on the steel rings 11, and the connecting lugs 21 between the two steel rings 11 are relatively distributed, and the bolt holes 23 are distributed in a one-to-one correspondence.

[0032] The support platform 3 includes vertical load-bearing ribs 31, grating stiffening plates 32, and surface steel plates 33. Two surface steel plates 33 are provided and are fixed to the outer wall of the steel ring 11 by welding. The two surface steel plates 33 are flush with the upper and lower ends of the steel ring 11, respectively. The vertical load-bearing ribs 31 are fixed between the two surface steel plates 33 by welding, and the grating stiffening plates 32 are fixed between the two vertical load-bearing ribs 31 by welding.

[0033] Several vertical load-bearing ribs 31 are provided, and adjacent vertical load-bearing ribs 31 are welded together in sequence along the height direction of the support platform 3.

[0034] Several grid stiffening plates 32 are provided, which are fixed between adjacent vertical load-bearing ribs 31 along the width direction of the support platform 3, and the several grid stiffening plates 32 together form a stiffening plate with the same shape as the surface steel plate 33. The vertical load-bearing ribs 31 and grid stiffening plates 32 mentioned above are distributed at equal intervals along the width direction of the support platform 3.

[0035] The inner diameter of the column-holding steel ring 1 is equal to the outer diameter of the column 4, which makes the column-holding steel ring and the column have an interference fit and better holding force.

[0036] The pile head treatment measures are as follows: Pneumatic hammers are used to remove the pile head 5 down to the designed pile top elevation, ensuring the concrete surface within the pile body is firm and the aggregate is evenly distributed. If the concrete quality within the pile body area after removal to the pile top elevation is poor, removal continues down to a fresh concrete surface. A 2.8m diameter C40 concrete 6 is poured within the bottom 50cm of the column 4, and an HRB400 Φ25 reinforced concrete structure 7 is installed on the top surface as the load-bearing point at the bottom of the load-bearing platform.

[0037] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A prestressed load-bearing platform for a column-supported, ground-mounted formwork support for a cap beam, comprising a load-bearing platform, characterized in that: The load-bearing platform includes a column-holding steel ring (1) and a support platform (3). The support platform (3) has two members, which are respectively located on both sides of the column-holding steel ring (1). The two support platforms (3) are provided with reaction beams (7) on their sides. The reaction beams (7) are provided with tie holes (71), and the tie holes (71) on the two reaction beams (7) are distributed in opposite directions. Tie prestressed steel bars (8) are inserted between the two reaction beams (7), and the tie prestressed steel bars (8) pass through the tie holes (71) distributed in opposite directions and are fixed on the reaction beams (7). The tie prestressed steel bars (8) are located on both sides of the load-bearing platform.

2. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 1, characterized in that: The prestressed steel bars (8) are provided in a plurality of lengths and are distributed at equal intervals along the height direction of the load-bearing platform, and the number of prestressed steel bars (8) on both sides of the load-bearing platform is equal.

3. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 1, characterized in that: The tension prestressed steel bar (8) is a threaded steel bar, and its end is fixed to the reaction beam (7) by an anchor nut (9), and a pad (10) is sandwiched between the anchor nut (9) and the reaction beam (7).

4. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 1, characterized in that: The reaction beam (7) is formed by splicing several I-beams (72) along the height direction of the load-bearing platform, and the tie holes (71) are set at the splicing points of adjacent I-beams (72).

5. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 1, characterized in that: The column-holding steel ring (1) is composed of two semi-circular steel rings (11). Each of the two outer side walls of the opening end of each steel ring (11) is provided with a connecting ear unit (2). The two steel rings (11) are fixed together by bolts through their respective connecting ear units (2). Each of the outer side walls of each steel ring (11) is fixed with a support platform (3) by welding. The height of the support platform (3) and the height of the connecting ear unit (2) are equal to the height of the column-holding steel ring (1).

6. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork frame according to claim 5, characterized in that: The connecting ear unit (2) includes a connecting ear plate (21) and a stiffening plate (22). The connecting ear plate (21) is fixed to the outer wall of the opening end of the steel ring (11) by welding, and the connecting ear plate (21) has a plurality of bolt holes (23). The stiffening plate (22) has a plurality of pieces and is fixed between the connecting ear plate (21) and the outer wall of the steel ring (11) by welding, and the plurality of stiffening plates (22) are arranged along the height direction of the connecting ear plate (21) and are distributed at equal intervals.

7. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 1, characterized in that: The support platform (3) includes vertical load-bearing ribs (31), grid stiffening plates (32), and surface steel plates (33). The surface steel plates (33) are provided in two pieces and are fixed to the outer wall of the steel ring (11) by welding. The two surface steel plates (33) are flush with the upper and lower ends of the steel ring (11). The vertical load-bearing ribs (31) are fixed between the two surface steel plates (33) by welding. The grid stiffening plates (32) are fixed between the two vertical load-bearing ribs (31) by welding.

8. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 7, characterized in that: The vertical load-bearing ribs (31) are provided in several pieces, and adjacent vertical load-bearing ribs (31) are welded together in sequence along the height direction of the support platform (3).

9. The prestressed load-bearing platform of the column-supported ground-mounted cap beam load-bearing formwork as described in claim 7, characterized in that: The grating stiffening plate (32) is provided in several pieces. The grating stiffening plate (32) is fixed between the adjacent vertical load-bearing ribs (31) along the width direction of the support platform (3), and the several grating stiffening plates (32) together form a stiffening plate with the same shape as the surface steel plate (33).

Images