Non-floor type formwork supporting frame for cast-in-place of concrete beam

Abstract

The utility model discloses a non-floor type template support frame for cast-in-place of a concrete beam, which is provided with two kinds of steel pipe upright posts with different lengths, namely a full-length steel pipe upright post and a half-length steel pipe upright post; welding a full-length steel pipe upright post on each bearing platform; triangular type steel truss beams are erected between every two adjacent bearing platforms, half-length steel pipe stand columns are erected at top joints of the triangular type steel truss beams, and the top faces of the half-length steel pipe stand columns are made to be at the same height as the top faces of the full-length steel pipe stand columns; unloading blocks are arranged by taking the top surfaces of the half-length steel pipe upright posts and the top surfaces of the full-length steel pipe upright posts as fulcrums; the self-discharging falling block is upwards and sequentially provided with a transverse bridge direction bearing beam and a longitudinal bridge direction bailey beam, a distribution beam is arranged on the top face of the bailey beam in the transverse bridge direction, and a non-floor type formwork supporting frame is formed. The utility model does not need to additionally arrange temporary buttresses or process bridge site foundations, and is particularly suitable for cast-in-place construction of concrete beams with poor bridge site foundations and high processing cost.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for concrete beams of bridge superstructure, and more specifically to a non-ground-mounted formwork support frame for cast-in-place concrete beams. Background Technology

[0002] Casting the superstructure concrete beams of bridges using the bridge-site scaffolding method is a common and mature construction technique. However, when the bridge is located on soft soil foundations such as farmland or swamps, if a full-span scaffolding system is used for the cast-in-place concrete superstructure formwork support, the soft soil foundation beneath the bridge needs to be treated. This treatment is difficult and costly, and there is also a risk of foundation settlement during construction. If a beam-column scaffolding system is used, temporary piers need to be installed within the bridge span when the bridge span exceeds 20 meters. Setting up temporary piers on soft soil foundations also presents difficulties, high costs, and safety risks related to settlement. Therefore, given the complex geological conditions of the bridge site, both traditional full-span formwork support systems and beam-column formwork support systems have certain technical drawbacks and safety risks. Utility Model Content

[0003] This utility model aims to overcome the shortcomings of existing technologies by providing a non-ground-mounted formwork support frame for cast-in-place concrete beams. This allows the frame to adapt to the cast-in-place construction of concrete beams for bridge superstructures under complex geological conditions, saving the cost of foundation treatment or temporary piers for the formwork support frame, and eliminating safety risks caused by settlement.

[0004] The present invention adopts the following technical solution to solve the technical problem:

[0005] The features of this utility model of a non-ground-supported formwork support frame for cast-in-place concrete beams are as follows: Two types of steel pipe columns of different lengths are used: full-length steel pipe columns and semi-length steel pipe columns. The full-length steel pipe columns are fixedly welded onto each bearing platform using embedded parts. A triangular steel truss beam is erected between two adjacent bearing platforms using the embedded parts. The semi-length steel pipe columns are supported at the top nodes of the triangular steel truss beams, ensuring that the top surface of the semi-length steel pipe columns is at the same height as the top surface of the full-length steel pipe columns. The top surfaces of each semi-length steel pipe column and each full-length steel pipe column serve as fulcrums, and unloading blocks are installed at each fulcrum. A load-bearing beam is placed transversely on the top surface of the unloading block, a Bailey beam is installed longitudinally on the top surface of the load-bearing beam, and a distribution beam is installed transversely on the top surface of the Bailey beam, thus forming a non-ground-supported formwork support frame.

[0006] The features of this utility model of non-ground-mounted formwork support frame for cast-in-place concrete beams are as follows: in order to increase the stability of the formwork support frame, a through-bolt is used to form a wall connection between the continuous steel pipe column and the pier body; a connecting system is set between adjacent steel pipe columns in the longitudinal and transverse directions to make all steel pipe columns form a whole.

[0007] The features of this utility model of non-ground-mounted formwork support frame for cast-in-place concrete beams are as follows: the structure of the triangular steel truss beam is as follows: the upper chord and lower chord are parallel bars, and the web members are welded between the upper chord and lower chord using node plates. The web members are arranged alternately with different oblique directions to form an overall inverted "W"-shaped triangular steel truss beam. Stiffening plates are locally welded onto the steel web plates of the upper chord and lower chord to prevent buckling in the flange area. Scissor bracing is set between each group of triangular steel truss beams in the transverse direction to increase lateral connection.

[0008] The feature of this utility model of non-ground-mounted formwork support frame for cast-in-place concrete beams is that the semi-long steel pipe column is welded and fixed to the node plate of the upper chord in the triangular steel truss beam.

[0009] The feature of this utility model of non-ground-mounted formwork support frame for cast-in-place concrete beams is that the through-core tie rod is made of precision rolled threaded steel and matching fasteners, which is connected and fixed to the continuous steel pipe column through the reserved holes in the pier body.

[0010] Compared with existing technologies, the beneficial effects of this utility model are reflected in:

[0011] 1. This utility model of non-ground-mounted formwork support frame does not require treatment of the bridge site foundation or the setting of temporary supports, saving construction costs and is suitable for the on-site construction of concrete beams in bridge sites with poor geological foundations.

[0012] 2. The novel non-ground-mounted formwork support frame of this utility model has a novel structure and a clear force transmission path. It utilizes the characteristics of large span capacity and strong node bearing capacity of the triangular steel truss beam to support all the loads on the two side platforms. There is no need to consider the influence of foundation factors on the formwork support frame. Its structure is stable and reliable, and there is no settlement problem, thus eliminating the safety risks caused by settlement. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main facade structure of this utility model;

[0014] Figure 2 This is a side view of the elevation structure of this utility model;

[0015] The following are the labeling elements in the diagram: 1. Foundation, 2. Foundation embedded parts, 3. Continuous steel pipe column, 4. Triangular steel truss beam, 5. Semi-long steel pipe column, 6. Unloading block, 7. Load-bearing beam, 8. Bailey beam, 9. Distribution beam, 10. Through tie rod, 11. Connection system, 12. Shear brace, 13. Pier body, 14. Concrete beam, 401. Upper chord, 402. Lower chord, 403. Web member, 404. Node plate, 405. Stiffening plate. Detailed Implementation

[0016] This utility model

[0017] See Figure 1 and Figure 2 In this embodiment, the non-ground-mounted formwork support frame for cast-in-place concrete beams is equipped with two types of steel pipe columns of different lengths: full-length steel pipe columns 3 and semi-length steel pipe columns 5. The full-length steel pipe columns 3 are fixedly welded onto each pier 1 using pier embedded parts 2. A triangular steel truss beam 4 is erected between two adjacent piers 1 using pier embedded parts 2. The semi-length steel pipe columns 5 are supported at the top nodes of the triangular steel truss beam 4, so that the top surface of the semi-length steel pipe columns 5 is at the same height as the top surface of the full-length steel pipe columns 3. The top surfaces of each semi-length steel pipe column 5 and each full-length steel pipe column 3 are used as fulcrums, and unloading blocks 6 are set at each fulcrum. A load-bearing beam 7 is placed transversely on the top surface of the unloading block 6, a Bailey beam 8 is set longitudinally on the top surface of the load-bearing beam 7, and a distribution beam 9 is set transversely on the top surface of the Bailey beam 8, forming a non-ground-mounted formwork support frame.

[0018] Figure 1 The embedded part 2 of the foundation shown is a "π"-shaped component welded from steel bars and steel plates, which has a solid structure; the through-core tie rod 10 is made of precision-rolled threaded steel and matching fasteners. Figure 1 The through-hole tie rod 10 shown is connected to and fixed to the continuous steel pipe column 3 through the reserved hole in the pier body 13.

[0019] In this embodiment, to increase the stability of the template support frame, a through-bolt 10 is used to form a wall connection between the full-length steel pipe column 3 and the pier body 13; a connecting system 11 is set between adjacent steel pipe columns in the longitudinal and transverse directions to make all steel pipe columns form an integral whole; the connecting system 11 is a truss structure welded from steel profiles and steel plates, and its ends are provided with gusset plates for welding connection with the full-length steel pipe column 3 and the semi-length steel pipe column 5.

[0020] Figure 1 The structural form of the triangular steel truss beam 4 shown is as follows: the upper chord 401 and lower chord 402 are parallel members, and the web members 403 are welded between the upper chord 401 and lower chord 402 using node plates 404. The web members 403 are arranged alternately with different oblique directions, forming an overall inverted "W"-shaped triangular steel truss beam 4; stiffening plates 405 are locally welded onto the steel web plates of the upper chord 401 and lower chord 402, and the stiffening plates 405 correspond to the nodes. The location of the gusset plate 404 is to prevent buckling in the flange area; scissor braces 12 are installed between each group of triangular steel truss beams 4 in the transverse direction to increase lateral connection; the semi-long steel pipe column 5 is welded and fixed to the node plate of the upper chord 401 in the triangular steel truss beam 4; the upper chord 401, lower chord 402 and web members 403 are all made of double channel steel welded into box-section members, and the node plate 404 is made of steel plate welded into a box structure to meet the welding connection requirements of each member.

[0021] In this embodiment, the load-bearing beam 7, distribution beam 9, Bailey beam 8, through-core tie rod 10, and unloading block 6 are all commercially available standardized or pre-designed products, which are procured according to requirements.

[0022] In specific implementation, before the concrete pouring of the pier cap 1, the prepared "π"-shaped steel bars and steel plates are welded together and embedded in the pier cap pre-embedded parts 2 at the designated positions on the pier cap 1. Continuous steel pipe columns 3 and triangular steel truss beams 4 are fabricated according to the pier height and span. Using lifting equipment, the continuous steel pipe columns 3 and triangular steel truss beams 4 are welded and fixed to the pier cap pre-embedded parts 2. To prevent the risk of overturning during the erection of the formwork support frame, after the two adjacent continuous steel pipe columns 3 in the transverse direction are installed in place, the transverse connection system 11 is installed, and the through-core tie rod 10 is tightened. For this purpose, after each pair of triangular steel truss beams 4 are installed in place, the scissor bracing 12 between the triangular steel truss beams 4 is installed in a timely manner. Then, a semi-long steel pipe column 5 is installed at the top node of the triangular steel truss beam 4, and the transverse connection system 11 of the semi-long steel pipe column 5 is installed simultaneously. Next, a slack block 6 is placed on the top surface of the full-length steel pipe column 3 and the semi-long steel pipe column, and a transverse load-bearing beam 7 is placed on the top surface of the slack block 6. A Bailey beam 8 is set on the top surface of the load-bearing beam 7 in the transverse direction, and a distribution beam 9 is set on the top surface of the Bailey beam 8 in the transverse direction to form a non-ground-mounted formwork support frame.

[0023] After the non-ground-mounted formwork support frame for cast-in-place concrete beams in this embodiment is erected, its load-bearing capacity must be verified by pre-stressing according to the specifications. It can only be used after passing the verification. Before dismantling the formwork support frame, first loosen the unloading block 6 and detach the load-bearing beam 7, Bailey beam 8 and distribution beam 9 above the unloading block from the bottom surface of the concrete beam 14. Then, dismantle each member of the formwork support frame from top to bottom.

Claims

1. A non-ground-mounted formwork support frame for cast-in-place concrete beams, characterized in that: Two types of steel pipe columns of different lengths are set up, namely, a full-length steel pipe column (3) and a half-length steel pipe column (5); the full-length steel pipe column (3) is fixedly welded on each bearing platform (1) using the bearing platform embedded parts (2); a triangular steel truss beam (4) is erected between two adjacent sets of bearing platforms (1) using the bearing platform embedded parts (2), and the half-length steel pipe column (5) is supported at the top node of the triangular steel truss beam (4) so ​​that the top surface of the half-length steel pipe column (5) is at the same height as the top surface of the full-length steel pipe column (3); Using the top surfaces of each half-length steel pipe column (5) and each full-length steel pipe column (3) as fulcrums, and setting unloading blocks (6) on each fulcrum; placing load-bearing beams (7) in the transverse direction on the top surface of the unloading blocks (6), setting Bailey beams (8) in the longitudinal direction on the top surface of the load-bearing beams (7), and setting distribution beams (9) in the transverse direction on the top surface of the Bailey beams (8) to form a non-ground-mounted formwork support frame.

2. The non-ground-mounted formwork support frame for cast-in-place concrete beams according to claim 1, characterized in that: The continuous steel pipe column (3) is fixed to the pier body (13) by forming a wall connection using a through-core tie rod (10); a connecting system (11) is set between adjacent steel pipe columns in the longitudinal and transverse directions to make all steel pipe columns form a whole.

3. The non-ground-mounted formwork support frame for cast-in-place concrete beams according to claim 1, characterized in that: The structure of the triangular steel truss beam (4) is as follows: the upper chord (401) and lower chord (402) are parallel members, and the web members (403) are welded between the upper chord (401) and lower chord (402) using node plates (404). The web members (403) are arranged alternately in different oblique directions to form an inverted "W"-shaped triangular steel truss beam (4). Stiffening plates (405) are locally welded onto the steel web of the upper chord (401) and lower chord (402) to prevent buckling in the flange area. Scissor braces (12) are set between each group of triangular steel truss beams (4) in the transverse direction to increase lateral connection.

4. The non-ground-mounted formwork support frame for cast-in-place concrete beams according to claim 3, characterized in that: The semi-long steel pipe column (5) is welded and fixed to the node plate of the upper chord (401) in the triangular steel truss beam (4).

5. The non-ground-mounted formwork support frame for cast-in-place concrete beams according to claim 2, characterized in that: The through-core tie rod (10) is made of precision rolled threaded steel and matching fasteners. It is connected to and fixed to the continuous steel pipe column (3) through the reserved hole in the pier body (13).

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