Y-shaped pier column inclined section template

Abstract

The utility model provides a Y-shaped pier column inclined section formwork, and relates to the technical field of Y-shaped pier column inclined section construction, according to the Y-shaped pier column inclined section formwork, finish rolling threaded steel bars are used for horizontally and oppositely pulling to balance formworks on the two sides of two limbs of a Y-shaped pier inclined section, and a framework of an I-shaped steel outer structure is arranged to be matched with the finish rolling threaded steel bars for horizontal oppositely pulling. Compared with the prior art, the utility model has the advantages that the operation is simple, the construction period is shortened, the cost is saved, and the structural reliability of a template system can be improved, so that the safety is higher.

Description

Technical Field

[0001] This utility model relates to the field of construction technology for inclined sections of Y-shaped piers, and in particular to a template for inclined sections of Y-shaped piers. Background Technology

[0002] Y-shaped piers are widely used due to their aesthetic appeal and small footprint. A Y-shaped pier consists of a straight section and an inclined section. The inclined section, with its large angle, presents significant challenges in formwork erection. Improper construction methods can not only reduce construction efficiency but also easily lead to pier instability and damage. Currently, there are two main technologies for formwork on the inclined section of Y-shaped piers: one is ground-supported steel pipe scaffolding, and the other is a "balanced tower + external rigid frame" formwork system.

[0003] The closest existing technology to this invention is the "balanced tower + external rigid frame" template system, the schematic diagram of which is shown below. Figure 1 The structure consists of a balancing tower erected in the middle of the Y-shaped pier, an external stiffening frame assembled on the outside of the inclined pier column, and the inclined pier column formwork placed on the external stiffening frame. The external stiffening frame and the balancing tower are connected by finely rolled threaded steel bars. The technical problems of this formwork system are: (1) a balancing tower needs to be erected, which takes a long time and consumes a lot of materials; (2) the inclined pier column relies only on finely rolled threaded steel bars to balance its own weight, which has a low safety reserve and puts forward higher requirements for the strength and stiffness of the balancing tower, resulting in a low safety factor. Utility Model Content

[0004] This utility model provides a Y-shaped pier inclined section formwork, which aims to overcome the two technical problems mentioned above in the existing "balanced tower + external stiffened frame" formwork system. The Y-shaped pier inclined section formwork proposed by this utility model has the advantages of simple operation, shortened construction period, cost saving, and improved structural reliability of the formwork system, thus providing higher safety.

[0005] This utility model provides the following technical solution to achieve the above objectives:

[0006] A Y-shaped pier inclined section template includes steel templates arranged around the left and right inclined sections of the Y-shaped pier. Several vertically arranged parallel ribs are provided on the outer side of the steel templates. Several horizontally spaced back braces are fitted on the outer side of the ribs. Several corresponding I-beam outer frames are provided on the outer side of the back braces and on the left and right sides of the left and right inclined sections. High-strength threaded steel bars are threaded through the back braces, vertical ribs, and I-beam outer frames arranged on the left and right inclined sections. High-strength threaded steel bars are also threaded through the back braces and vertical ribs arranged on the left and right inclined sections, and are arranged adjacently and equidistantly. The high-strength threaded steel bars on the left and right inclined sections are arranged in a one-to-one correspondence, and the two adjacent ends of two corresponding high-strength threaded steel bars are connected to another high-strength threaded steel bar through a connector.

[0007] In the aforementioned Y-shaped pier inclined section formwork, a reinforcing structure is provided at the I-beam outer frame of the already poured section of the Y-shaped pier.

[0008] In the aforementioned Y-shaped pier inclined section formwork, the reinforcing structure includes channel steel and pad steel plate, which are placed in the gap between the back bar and the steel formwork.

[0009] In the aforementioned Y-shaped pier inclined section template, anchor plates are provided at the assembly points of the precision-rolled threaded steel bars, back braces, vertical ribs, and I-beam outer frame.

[0010] Compared to existing "balanced tower + external rigid frame" formwork systems, this invention eliminates the balanced tower and utilizes high-strength threaded steel bars to horizontally tension the formwork on both sides of the inclined section of the Y-shaped pier. An external I-beam frame is also installed, extending into the already poured section. High-strength threaded steel bars are used, and 300KN prestress is applied to anchor the external frame to the poured section. The inclined section formwork rests against the cantilever end of the external frame, with horizontal tensioning provided by the high-strength threaded steel bars. This improves the reliability of the formwork system structure, resulting in higher safety. Furthermore, implementing this invention offers advantages such as simple operation, shorter construction time, and cost savings. Attached Figure Description

[0011] Figure 1 A structural schematic diagram of the existing "balanced tower + external rigid frame" formwork system;

[0012] Figure 2 This is a structural schematic diagram of the Y-shaped pier column inclined section template of this utility model;

[0013] Figure 3 for Figure 2 Cross-sectional view of the inclined section template of the Y-shaped pier column of Zhongben Utility Model;

[0014] Figure 4 This is a cross-sectional view of the inclined section template of the Y-shaped pier column of this utility model.

[0015] Figure 5 This is a schematic diagram of the casting of the inclined section template for the Y-shaped pier column of this utility model;

[0016] Attached reference numerals: 1-Vertical rib; 2-Back bar; 3-I-beam outer frame; 4-Precision rolled threaded steel bar; 401-Anchor plate; 5-Connector; 6-Reinforcing structure; 7-Cast segment; 8-Segment to be cast. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. These descriptions are not intended to limit the scope of this utility model.

[0018] Example. A template for the inclined section of a Y-shaped pier column, structural reference attached. Figure 2-5 The system includes steel formwork surrounding the left and right inclined sections of the Y-shaped pier. Several vertically arranged ribs 1 are provided on the outer side of the steel formwork. Several horizontally spaced back braces 2 are fitted on the outer side of the ribs 1. Several corresponding I-beam outer frames 3 are provided on the outer side of the back braces 2 and on the left and right sides of the inclined sections. Fine-rolled threaded steel bars 4 are threaded through the back braces 2, vertical ribs 1, and I-beam outer frames 3 arranged on the left and right inclined sections. Fine-rolled threaded steel bars 4 are also threaded through the back braces 2 and vertical ribs 1 arranged on the left and right inclined sections. The fine-rolled threaded steel bars 4 are arranged adjacently and equidistantly. The fine-rolled threaded steel bars 4 on the left and right inclined sections are arranged in a one-to-one correspondence, and the two adjacent ends of two fine-rolled threaded steel bars 4 are connected to another fine-rolled threaded steel bar 4 through a connector 5.

[0019] A reinforcing structure 6 is provided at the I-beam outer frame 3 of the cast-in-place segment of the Y-shaped pier column. The reinforcing structure 6 includes channel steel and pad steel plate, which are placed in the gap between the back bar 2 and the steel formwork.

[0020] Anchor plates 401 are provided at the assembly points of the fine-rolled threaded steel bar 4, the back bar 2, the vertical rib 1, and the I-beam outer frame 3.

[0021] With the above structure, the specific implementation of the Y-shaped pier column inclined section formwork involves sequentially setting up vertical ribs 1, back braces 2, and I-beam outer frame 3 on the outside of the steel formwork, with the following implementation details:

[0022] Vertical rib 1 is made of 10# channel steel, back bar 2 is made of 14# double channel steel, and outer frame 3 is made of I20a I-beam. The inclined section is symmetrically arranged in the transverse direction on both sides of the single limb, with 4 sets on each side and 2 I-beams in each set. The length of the outer frame of I-beam 3 should be 4.5m.

[0023] The formwork on both sides of the inclined section of the Y-shaped pier column is reinforced by tensioning with finely rolled threaded steel bars 4 through anchor plates 401. The horizontal spacing should be 1m, and the vertical spacing is the same as the back bar 2 spacing. Furthermore, the outer frame 3 of the I-beam must be reinforced with finely rolled threaded steel bars 4.

[0024] The threaded steel bars 4 between the two legs of the Y-shaped pier column are extended by connectors 5, and another threaded steel bar 4 is connected between the two connectors 5.

[0025] For the already poured segment 7, a reinforcing structure 6 is set under the I-beam outer frame 3. The gap between the back bar 2 and the steel formwork is filled by channel steel and padding steel plate to improve the rigidity of the formwork.

[0026] It should also be noted that the pouring height of each segment of the inclined pier should not exceed 2.5m. After each segment of the pier is poured, four pairs of finely threaded steel bars should be retained for tie rods. The I-beam outer frame 3 extends into the poured segment 7, and the extension length should ensure that there are at least two pairs of finely threaded steel bars for tie rods, and the cantilever length should be greater than the length of the segment 8 to be poured.

[0027] When using the above-mentioned Y-shaped pier inclined section formwork for segmental construction, the construction steps are as follows:

[0028] S1: The concrete pouring height of each segment shall not exceed 2.5m. After the concrete of the poured segment 7 has been cured for a period of time, move the I-beam outer frame 3 to extend into the poured segment 7. The extension length should ensure that at least two finely rolled threaded steel bars 4 are tied together, and the cantilever length is greater than the length of the segment 8 to be poured.

[0029] S2: Apply 300KN prestress to the 3 fine-rolled threaded steel bars 4 of the outer frame of the 7-section I-beam and anchor the outer frame I-beam 3 to the pier body of the 7-section I-beam.

[0030] S3: Slide the template of the segment to be poured (8) along the outer frame of the I-beam to the installation position, and connect the template of the segment to be poured (8) to the template of the already poured segment (7) with bolts.

[0031] S4: After the formwork is in place, the upper cantilever section of the I-beam outer frame 3 is tightly attached to the formwork back brace of the segment to be poured 8, and the threaded steel bars 4 of the formwork system are clamped together on both sides of the single-limb formwork system (including the I-beam outer frame 3). Then, the threaded steel bars 4 of the double-limb formwork system are connected using connector 5 to form horizontal tension.

[0032] S5: Pour concrete on both sides of the inclined section. Pour in symmetrical, balanced layers to ensure the concrete on both sides is at the same level, and the height of each layer should not exceed 50cm.

[0033] S6: Repeat S1~S5 until the concrete pouring of the inclined section is completed.

[0034] Using the above technology, a rigid frame bridge was constructed in Guizhou. The rigid frame bridge has four Y-shaped piers, each 28m high, with a straight section of 17.2m and an inclined section of 10.8m, with an inclination angle of 13°. Compared with the estimated construction period and cost of existing technologies, the implementation saved about 14 days of construction time and about 239,376 yuan in costs.

Claims

1. A template for the inclined section of a Y-shaped pier column, characterized in that: The steel formwork includes a steel template arranged around the left and right inclined sections of the Y-shaped pier column; characterized in that: a number of vertical ribs (1) are arranged in parallel around the outside of the steel formwork, a number of horizontally spaced back bars (2) are assembled on the outside of the vertical ribs (1), and a number of corresponding I-beam outer frames (3) are arranged on the outside of the back bars (2) and on the left and right sides of the left and right inclined sections respectively; finely rolled threaded steel bars (4) are installed through the back bars (2), vertical ribs (1) and I-beam outer frames (3) arranged on the left and right inclined sections, and finely rolled threaded steel bars (4) are also installed through the back bars (2) and vertical ribs (1) arranged on the left and right inclined sections, and the finely rolled threaded steel bars (4) are arranged adjacently and equidistantly; the finely rolled threaded steel bars (4) on the left and right inclined sections are arranged one-to-one, and the two adjacent ends of the two finely rolled threaded steel bars (4) arranged one-to-one are connected to another finely rolled threaded steel bar (4) through a connector (5).

2. The Y-shaped pier inclined section formwork according to claim 1, characterized in that: A reinforcing structure (6) is provided at the I-beam outer frame (3) of the cast-in-place segment of the Y-shaped pier column.

3. The Y-shaped pier inclined section formwork according to claim 2, characterized in that: The reinforcing structure (6) includes channel steel and pad steel plate, which are disposed in the gap between the back bar (2) and the steel template.

4. The Y-shaped pier inclined section formwork according to claim 1, characterized in that: Anchor plates (401) are provided at the assembly points of the fine-rolled threaded steel bars (4), back bars (2), vertical ribs (1), and I-beam outer frame (3).

Images