Temporary combined supporting system suitable for construction of large-size V-shaped pier

Abstract

The utility model discloses a temporary combined supporting system suitable for large-size V-shaped pier construction, and belongs to the technical field of bridge engineering formwork supporting structures. The side formwork comprises a floor steel pipe support and a side formwork bailey beam truss, and the floor steel pipe support is connected with the side formwork bailey beam truss. The landing steel pipe support is arranged on a pier column of the V-shaped pier and comprises a set of landing steel pipe piles, one landing steel pipe pile is vertically arranged in the middle of the V-shaped pier, and the other landing steel pipe piles are symmetrically arranged on the two sides of the V-shaped pier. The side mold bailey beam truss comprises a triangular truss, a bailey beam support and an arc-shaped truss which are sequentially arranged from bottom to top. The triangular truss is arranged on a pier column of the V-shaped pier, the arc-shaped truss is arranged on the outer side of an inclined leg of the V-shaped pier, and the shape of the arc-shaped truss is matched with that of the inclined leg of the V-shaped pier; and the bearing beam is fixed on the side mould bailey beam truss and is connected with the floor steel pipe bracket. The supporting structure which is safe, reliable and small in occupied area can be provided for the inclined leg construction process of the large-size V-shaped pier, the construction efficiency of the pier is improved, and the construction cost and the investment of a construction area are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of formwork support structures for bridge engineering, and particularly relates to a temporary combined support system suitable for the construction of large-volume V-shaped piers. Background Technique

[0002] With the rapid development of the economy and the advancement of the urbanization process, the demand for the construction of transportation infrastructure is increasing day by day. As an important transportation hub connecting two places, bridges play an important role in economic development and social mobility. Among them, V-shaped inclined-leg piers are widely used in the lower structures of bridges on expressways and urban expressways due to their excellent seismic performance, excellent load-bearing capacity, and beautiful shape.

[0003] However, the surrounding environments of some bridges are not suitable for the conventional construction techniques of V-shaped piers. Moreover, when the volume of the V-shaped pier is large, it is more difficult to carry out construction operations in a limited area. For example, if the bridge site is in a water source protection area, a forest protection area, etc., large-scale construction directly will have an adverse impact on the ecological environment; if the bridge site is located in an area where high-voltage cables, gas pipelines, water supply pipelines, etc. are laid, direct construction will affect the normal operation of public facilities and the lives of residents; or if the bridge site is in an ecological protection area, a cultural relic protection area, a scenic spot, a historical and cultural city, etc., large-scale construction and development are usually not allowed in these areas due to legal regulations. Therefore, when encountering special situations where the construction area is restricted, the construction plan for large-volume V-shaped piers needs to be considered comprehensively in many aspects. Content of the Utility Model

[0004] Aiming at the above problems existing in the prior art, the purpose of the utility model is to provide a temporary combined support system suitable for the construction of large-volume V-shaped piers, which can provide a safe, reliable and small-footprint support structure for the construction process of the inclined legs of large-volume V-shaped piers, improve the construction efficiency of the piers, and reduce the construction cost and the investment in the construction area.

[0005] The utility model provides the following technical solution: A temporary combined support system suitable for the construction of large-volume V-shaped piers, including a floor steel pipe support and a side form Bailey truss. The floor steel pipe support and the side form Bailey truss are connected by high-strength rolled thread steel bars to form a support system;

[0006] The floor steel pipe support is arranged on the pier column of the V-shaped pier, and it includes a group of floor steel pipe piles. One of the floor steel pipe piles is vertically arranged in the middle of the V-shaped pier, and the remaining floor steel pipe piles are symmetrically arranged on both sides of the V-shaped pier;

[0007] The side form Bailey beam trusses are installed in groups, with two trusses in a group, which include a triangular truss, a Bailey beam support and an arc truss arranged in sequence from bottom to top; the triangular truss is arranged on the pier column of the V-shaped pier, and the arc truss is arranged outside the inclined leg of the V-shaped pier, and its shape matches the outer shape of the inclined leg of the V-shaped pier;

[0008] The load-bearing beam is fixed on the side form Bailey beam truss and is connected to the floor steel pipe support.

[0009] Furthermore, side form support pins, side form support limit plates and steel pipe column embedded parts are pre-embedded on the bottom pier column of the first section of the V-shaped pier; the formworks on both longitudinal bridge sides of the bottom pier column of the first section are self-stabilized on the abutment, and the formworks on both transverse bridge sides are vertically placed on the abutment and are fixed by tensioning; the formwork between the two inclined legs of the pier column is placed flat on the surface of the concrete cushion block arranged on the abutment.

[0010] Furthermore, the floor steel pipe support is fixedly connected to the steel pipe column embedded part, and a group of threaded steel bar fixed ends are arranged thereon; a transverse connection system and a diagonal connection system are arranged between the floor steel pipe piles in the floor steel pipe support.

[0011] Furthermore, the threaded steel bar fixed end adopts a double-layer plate structure, and a rolled threaded steel pin seat and a connecting ear plate are arranged thereon.

[0012] Furthermore, the triangular truss and the Bailey beam support, and the Bailey beam support and the arc truss are connected by passing joints; the triangular truss is connected to the side form support pin; a group of continuous stiffening plates for improving stiffness are arranged on the triangular truss and the arc truss.

[0013] By adopting the above technologies, compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1) By adopting the combined design of a symmetric support system and assisting with the introduction of the temporary prestressing construction technology, the present utility model ensures the safety of the construction site of the large-volume inclined legs of the V-shaped pier, reasonably bears the self-weight load of the pier and disperses and transfers it; at the same time, it reduces the risk of damage to the V-shaped pier, and improves the construction efficiency and resource utilization rate;

[0015] 2) The temporary combined support system of the present utility model has a small floor area and only needs to occupy the pier abutment area, and can be used when the construction area of the pier is limited, and has a wide application range;

[0016] 3) The temporary combined support system of the present utility model does not need to erect a large-area overall floor support, has a low erection difficulty, and has high construction efficiency and resource utilization rate;

[0017] 4) The force of the temporary combined support structure system of the present utility model is clear, the cooperation mechanism between structures is simple and the connection is reliable, and it can bear the influence of the self-weight of the pier and external loads, and has high safety. Description of the Drawings

[0018] Figure 1 It is a front view structural schematic diagram of the support system of the present utility model;

[0019] Figure 2 It is a side view structural schematic diagram and a partial structural schematic diagram of the support system of the present utility model;

[0020] Figure 3 It is a construction structural schematic diagram of the first pier column and the bearing platform of the present utility model. 3a is a side view, 3b is a front view, 3c is an enlarged structural schematic diagram at D in 3a, and 3d is an enlarged structural schematic diagram at E in 3b;

[0021] Figure 4 It is a vertical layout structural schematic diagram of the landing support pipe piles of the present utility model. 4a is a vertical layout drawing in the A-A direction in 4b, 4b is a vertical layout drawing in the B-B direction in 4a, and 4c is a vertical layout drawing in the C-C direction in 4b;

[0022] Figure 5 It is a structural schematic diagram of the fixed end of the high-strength threaded steel of the present utility model. 5a is a structural schematic diagram of the A-type high-strength threaded steel fixed end, 5b is a structural schematic diagram of the B-type high-strength threaded steel fixed end, 5c is a structural schematic diagram of the C-type high-strength threaded steel fixed end, and 5d is an installation schematic diagram of the high-strength threaded steel pin seat and the connecting ear plate at the fixed end of the high-strength threaded steel;

[0023] Figure 6 It is a structural schematic diagram of the triangular truss of the present utility model. 6a is an overall structural schematic diagram of the triangular truss, and 6b is an enlarged structural schematic diagram at F in 6a;

[0024] Figure 7 It is a structural schematic diagram of the structural layout of the arc truss of the present utility model.

[0025] In the figure: 1-V-shaped pier, 2-landing steel pipe pile, 3-high-strength threaded steel bar, 4-triangular truss, 5-Bailey beam support, 6-arc truss, 7-fixed end of high-strength threaded steel, 8-high-strength threaded steel pin seat, 9-circumferential stiffening plate, 10-connecting ear plate, 11-end head stiffening plate, 12-continuous stiffening plate, 13-side formwork truss pin seat, 14-joint, 15-side formwork truss embedded part, 16-steel pipe column embedded part, 17-customized steel formwork, 18-tie rod, 19-lateral connection system, 20-diagonal connection system, 21-main load-bearing beam. Detailed implementation manners

[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the specification drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] On the contrary, the present utility model covers any substitutions, modifications, equivalent methods and solutions made to the essence and scope of the present utility model as defined by the claims. Further, in order to enable the public to have a better understanding of the present utility model, some specific details are described in detail in the following detailed description of the present utility model. Those skilled in the art can fully understand the present utility model without the description of these details.

[0028] See Figure 1 and Figure 2 is the overall schematic diagram of the temporary combined support system for the construction of the large-volume V-shaped pier. The overall construction plan adopts the construction of the floor steel pipe support and the side form Bailey beam truss. The fine-threaded steel bars 3 are used to connect between the floor steel pipe piles and the Bailey beam truss.

[0029] See Figure 3 , when constructing the first section of the pier column, the side formwork support limit plate 15, the side formwork support pin seat 13 and the steel pipe column embedded parts 16 are embedded. Among them, when constructing the bottom pier column of the first section, the customized steel formwork 17 is used as the side formwork. The formwork is installed and positioned according to the design position to ensure the accurate linearity of the pier column. The formworks on both sides in the longitudinal bridge direction are installed before the steel bars are tied, and the formworks are self-stabilized on the bearing platform; the formworks on both sides in the transverse bridge direction are installed after the steel bars are tied and are erected vertically on the bearing platform perpendicular to the ground. The formworks are fixed by the tie rods 18 in a tensioned manner; the formworks between the two V legs of the pier column are installed after the steel bars are tied, and the formworks are placed flat on the surface of the concrete pads. The formwork installation must have tight joints and be firmly installed. Double-sided tape can be pasted at the joints.

[0030] After the construction of the bearing platform and the initial section at the bottom of the V-shaped pier, a floor steel pipe support is erected inside the two inclined legs of the V-shaped pier as the main load-bearing structure of the side formwork support for the pier column construction. See Figure 4 . The erection position of the floor steel pipe support should be reasonably arranged according to the shape of the V-shaped bridge pier. The V-shaped pier is a left-right space-symmetrical structure. Therefore, the floor steel pipe piles 2 of the floor steel pipe supports on both sides of the main pier should be symmetrically arranged on the bearing platform, and one of the floor steel pipe piles 2 is vertically arranged in the center of the V-shaped pier.

[0031] Multiple floor steel pipe piles 2 are spliced by groove welding at the flat ground, and after splicing, they are hoisted and fillet welded to the steel pipe column embedded parts 16. After the installation of the floor steel pipe piles 2 is completed, the transverse connection system 19 and the diagonal connection system 20 between the steel pipe piles are installed. The ends of them are processed into arcs and welded to the steel pipe piles. After the transverse connection and the diagonal connection system 20 of the floor steel pipe piles are completed, the reinforcement of the fixed end 7 of the threaded steel bars is carried out on the floor steel pipe piles 2. See Figure 5After accurately positioning the fixed end 7 of the threaded steel bar according to the design requirements, install the annular stiffening plate 9, that is, at the fixed end 7 of the threaded steel bar, double-layer plates are used for welded connection with the steel pipe pile. Then install the connecting ear plate 10 and the fine-rolled threaded steel socket 8. It should be noted that during installation, ensure that the reserved holes of the connecting ear plates on both sides are on the same straight line as the plate pin rods.

[0032] In addition to the floor steel pipe support as the construction support system for the inclined legs of the V-shaped pier, a side form Bailey beam truss is designed to be combined with it. The side form Bailey beam truss successively includes a triangular truss 4, a Bailey beam support 5, and an arc truss 6 from bottom to top. See Figure 1 , Figure 2 , Figure 6 and Figure 7 . The side form trusses are installed in groups, with two trusses in a group. During installation, use the side form support limit plate 15 embedded in the previous section for temporary fixation. The triangular truss 4 is connected to the embedded socket 13 of the bearing platform, and the arc truss 6 is a structural design to adapt to the lateral shape of the inclined leg. After the installation of each group of trusses is completed, install the main load-bearing beam 21. After the main load-bearing beam 21 is welded and fixed to the Bailey beam, use the fine-rolled threaded steel bar 3 to connect the main load-bearing beam 21 to the floor steel pipe support. A end stiffening plate 11 is set at the connection between the main load-bearing beam 21 and the side form Bailey beam truss. In addition, continuous stiffening plates 12 are set at intervals on the triangular truss 4 and the arc truss 6 to increase the stiffness of the Bailey beam. Before concrete pouring, apply a certain initial pre-tension to each fine-rolled threaded steel bar 3 to reduce the deformation influence caused by the self-weight of the poured V-shaped pier.

[0033] Use a tower crane to extend the side form Bailey beam truss. The side form Bailey beam trusses are connected through joints 14. See Figure 7 . During temporary construction, the floor steel pipe pile system and the side form Bailey beam truss system interact with each other through the fine-rolled threaded steel bar 3. The specific mechanism is as follows: The gravity of the inclined legs on both sides of the V-shaped pier is transmitted to the main load-bearing beam 21 through the side form Bailey beam truss, and then symmetrically transmitted to the floor steel pipe piles 2 through the fine-rolled threaded steel bar 3. Finally, the horizontal component forces of the fine-rolled threaded steel bars 3 on both sides of the floor steel pipe piles 2 cancel each other out, and the vertical resultant force is transmitted to the ground. The two systems jointly bear the load and cooperate with each other.

[0034] Embodiment:

[0035] As Figure 1 shown, this embodiment provides a temporary combined support system applicable to the construction of large-volume V-shaped pier inclined legs, including floor steel pipe piles 2 and Bailey beam supports, which are connected together through fine-rolled threaded steel bars 3.

[0036] During the construction of the first pier column, the formwork layout is as Figure 3As shown in the figure, the embedded side formwork support limiting plate 15, side formwork support pin seat 13 and steel pipe column embedded parts 16 are provided. The embedded side formwork support limiting plate is made of a steel plate with a thickness of 2 cm and a side length of 20 cm. The steel plate is double-sided welded with 6 HRB400 φ12 mm embedded steel bars, the welding length is 6 cm, the length of the embedded steel bars is 26 cm, the length extending into the straight section of the concrete is 20 cm, and it is welded to the pier column steel bars.

[0037] As Figure 4 shown, the cast-in-place steel pipe piles are made of φ14 mm steel pipes with a length of 12 m, and are extended by groove welding. Eight 200×100 mm steel plates with a thickness of not less than 10 mm are welded around. Twenty stiffeners are used to reinforce the connection between the steel pipe and the embedded steel plate around.

[0038] After the installation of the steel pipe columns is completed, the transverse connection system 19 and diagonal connection system 20 are installed. The transverse steel pipes are φ610*10 mm, and the diagonal and inclined steel pipes are φ325*6 mm. They are welded to the vertical poles. The ends of the transverse steel pipes are processed into arcs and welded to the columns.

[0039] As Figure 5 shown, after the transverse and diagonal connection systems are completed, the reinforcement measures for the fixed end 7 of the precision rolled threaded steel are installed. The position of the fixed end is accurately positioned. First, the annular stiffening plate 9 is installed. Each place is welded to the column with double-layer plates, with a spacing of 20 cm, and the two layers of stiffening plates are strengthened with steel plates. The annular steel plate is a semi-circular steel plate with an outer diameter of 1.6 m, an inner diameter of 1.2 m, and a thickness of 2 cm. The reinforcing steel plates are 400*200*10 steel plates, and the number of each place is 4. Finally, the connecting ear plate 10 and the precision rolled threaded steel pin seat 8 are installed.

[0040] The side formwork Bailey beam truss includes a triangular truss 4, a Bailey beam support 5 and an arc truss 6. The side formwork trusses are installed in groups, with two trusses in a group, connected by a 90-shaped frame, and temporarily fixed by using the limiting plates embedded in the previous section during installation. The bottom of the Bailey beam truss is connected by triangular trusses, and the triangular trusses are connected to the embedded pin seats 13 of the bearing platform.

[0041] After the installation of each group of trusses is completed, the double I45a main load-bearing beams 21 are installed. After the main load-bearing beams are welded and fixed to the Bailey beams, the side formwork trusses are connected to the cast-in-place steel pipe supports through precision rolled threaded steel bars 3. The precision rolled threaded steel bars at both sides are connected to the end pipe piles with PSB930 φ32 precision rolled threaded steel bars; the precision rolled threaded steel bars in the middle position are connected to the central cast-in-place steel pipe support connection system with PSB930 φ40 precision rolled threaded steel bars.

[0042] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temporary combined support system applicable to the construction of large-volume V-shaped piers, characterized in that, It includes a floor steel pipe support and a side form Bailey beam truss. The floor steel pipe support and the side form Bailey beam truss are connected to form a support system. The floor steel pipe support is arranged on the pier column of the V-shaped pier. It includes a group of floor steel pipe piles (2). One of the floor steel pipe piles (2) is vertically arranged in the middle of the V-shaped pier, and the remaining floor steel pipe piles (2) are symmetrically arranged on both sides of the V-shaped pier. The side form Bailey beam trusses are installed in groups, two in a group. It includes a triangular truss (4), a Bailey beam support (5) and an arc truss (6) arranged in sequence from bottom to top. The triangular truss (4) is arranged on the pier column of the V-shaped pier, and the arc truss (6) is arranged on the outside of the inclined leg of the V-shaped pier, and its shape matches the outer shape of the inclined leg of the V-shaped pier. The load-bearing beam (21) is fixed on the side form Bailey beam truss and is connected to the floor steel pipe support.

2. The temporary combined support system applicable to the construction of large-volume V-shaped piers according to claim 1, characterized in that On the bottom pier column of the first section of the V-shaped pier, a side form support pin seat (13), a side form support limit plate (15) and a steel pipe column embedded part (16) are pre-embedded. The templates on both longitudinal bridge sides of the bottom pier column of the first section are self-stabilized on the abutment, and the templates on both transverse bridge sides are vertically placed on the abutment and are fixed by tensioning. The template between the two inclined legs of the pier column is placed flat on the surface of the concrete cushion block arranged on the abutment.

3. The temporary combined support system applicable to the construction of large-volume V-shaped piers according to claim 2, characterized in that, The floor steel pipe support is fixedly connected to the steel pipe column embedded part (16), and is provided with a group of threaded steel bar fixed ends (7). A transverse connection system (19) and a diagonal connection system (20) are arranged between the floor steel pipe piles (2) in the floor steel pipe support.

4. The temporary combined support system applicable to the construction of large-volume V-shaped piers according to claim 3, characterized in that The threaded steel bar fixed end (7) adopts a double-layer plate structure, and is provided with a precision rolled threaded steel pin seat (8) and a connecting ear plate (10).

5. The temporary combined support system applicable to the construction of large-volume V-shaped piers according to claim 2, characterized in that, The triangular truss (4) and the Bailey beam support (5), and the Bailey beam support (5) and the arc truss (6) are connected by a through joint (14). The triangular truss (4) is connected to the side form support pin seat (13). A group of continuous stiffening plates (12) for improving stiffness are arranged on the triangular truss (4) and the arc truss (6).

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