Split prefabricated cover beam connected with support cushion blocks

Abstract

The utility model discloses a split prefabricated bent cap connected with a support cushion block. The split prefabricated bent cap comprises more than two prefabricated split pieces which are uniformly distributed along the longitudinal direction of a bridge, all the prefabricated fragments are arranged on more than two shared bridge piers in parallel at intervals, a plurality of cast-in-place support lower padstones are arranged on the prefabricated fragments in the transverse bridge direction, and the prefabricated fragments are fixedly connected through the plurality of support lower padstones; each support lower padstone is of a cast-in-place structure, and an internal steel bar structure comprises a plurality of perforated steel plates arranged in the transverse bridge direction and a plurality of perforated steel bars arranged in the longitudinal bridge direction. During construction, the prefabricated fragments are manufactured firstly, then the prefabricated fragments are arranged in place on the pier, then the perforated steel plates are sequentially arranged on the prefabricated fragments, the perforated steel bars are arranged in a penetrating mode, other constructional steel bars of the lower cushion stone of the support are bound, and finally concrete is poured to connect all the prefabricated fragments into a whole. According to the utility model, the integrality of the cover beam can be improved, the hoisting construction procedure is simplified, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cap beam construction, in particular to a prefabricated cap beam with pieces connected with support pads. Background Art

[0002] With the development of prefabricated technology, prefabricated bridge construction has made great progress.

[0003] Among them, the key to the prefabrication and assembly technology of the lower structure is the cap beam. The cap beam of the viaduct has the characteristics of concentrated force, large size and heavy weight. In engineering practice, the weight of the cap beam is often relatively heavy, and is limited by transportation conditions and lifting space (generally when it exceeds 250 tons, transportation becomes more difficult). It is impossible to adopt the overall prefabrication construction method, and it is necessary to consider prefabricating the cap beam itself in sections and then assembling it on site.

[0004] The existing cap beam structure of segmented prefabricated assembly construction can be divided into two types based on the segmentation method: dividing the cap beam into segments along the transverse direction of the bridge and dividing it into pieces along the direction of the bridge.

[0005] At present, transverse segmentation is widely used in engineering, and there are two types of joints: dry joints and wet joints. Although this segmentation method can avoid the use of full-height brackets, during the construction process, the assembled sections cannot obtain effective support, and temporary support points are still required. The temporary support can only be removed after the joints reach the design strength or prestressing, which will still affect ground traffic and has a long construction period.

[0006] Some scholars have also proposed the use of longitudinal segmentation, that is, dividing the cap beam into multiple segments along the width direction, each of which can be a complete cap beam structure, and no temporary bracket is required for on-site component installation, which has the advantages of convenient construction and low risk. However, the connection technology of two adjacent cap beams of longitudinal segmented prefabricated cap beams is still immature. Although there are many connection methods in practice, there are certain problems:

[0007] 1. Some scholars have proposed a method of not connecting the segmented cap beams, but the integrity of the cap beam is poor. Under the action of vehicle loads, there will be a deformation difference between the two adjacent cap beams, which will affect the durability of the expansion joint of the upper beam and even cause damage to the expansion joint.

[0008] 2. Some scholars have proposed to set a wet joint of a certain width between two adjacent cap beams. Because the joint is narrow and the vertical height is large, it is difficult to pour concrete, and it is necessary to set up a hanging formwork, which makes the construction more complicated. In addition, because of the setting of wet joints, the thickness of the prefabricated cap beam along the bridge is small, and the number of prestressed steel strands is limited, which will increase the size of the cap beam along the bridge to a certain extent.

[0009] 3. Some scholars have proposed that the two adjacent cap beams should not be connected, and only a continuous wet joint should be set on the top of the cap beam.

[0010] Although this solution can solve the problems of the above two solutions, the amount of concrete poured on site is large. On the other hand, from the perspective of structural stress, the top wet joint is full-length, which not only has to bear the vertical shear force between the two adjacent cap beams, but also has to share part of the cap beam bending moment, which is prone to cracks. If ultra-high performance concrete is used to avoid the appearance of cracks, it will increase the cost of the project.

[0011] Therefore, how to solve the problems existing in the above-mentioned prior art, ensure the integrity of the segmented cap beams after connection, improve the construction convenience, and improve the stress performance of the connection structure has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0012] In view of the above-mentioned defects of the prior art, the utility model provides a segmented prefabricated cap beam connected by support pads, the purpose of which is to ensure the integrity of the segmented cap beam after connection, improve the construction convenience, and improve the stress performance of the connection structure.

[0013] To achieve the above-mentioned purpose, the utility model discloses a prefabricated cap beam connected by bearing pads, comprising two or more prefabricated segments evenly distributed along the longitudinal bridge direction;

[0014] All the prefabricated segments are arranged on two or more common bridge piers, are arranged parallel to each other and at intervals, and are provided with a plurality of cast-in-place support pad stones along the transverse direction of the bridge, and are fixedly connected by the plurality of support pad stones;

[0015] Each of the support bottom stones is a cast-in-place structure, and the internal steel bar structure includes a plurality of perforated steel plates arranged along the transverse direction of the bridge, and a plurality of perforated steel bars arranged along the longitudinal direction of the bridge;

[0016] Each of the perforated steel plates is provided with a hole corresponding to each of the perforated steel bars belonging to the same support lower pad stone, for inserting the corresponding perforated steel bars;

[0017] Each of the prefabricated segments connected to each of the support lower pad stones is provided with an embedded steel plate at each pad stone connection position, and is connected to the corresponding perforated steel plate by welding through the corresponding embedded steel plate;

[0018] A U-shaped steel bar is provided at each of the pad stone connection positions corresponding to each of the perforated steel bars located on one side of the corresponding perforated steel plate;

[0019] The arc-shaped bent portion of each U-shaped steel bar is sleeved on the corresponding perforated steel bar, and the two straight ends are pre-buried in the pad stone connection position of the corresponding first prefabricated segment of the cap beam or the corresponding second prefabricated segment of the cap beam.

[0020] Preferably, the interval between the first prefabricated slice and the second prefabricated slice is 30 mm±10%.

[0021] Preferably, each of the embedded steel plates has a surface on which the corresponding prefabricated segment is provided with embedded steel bars, and is fixed to the corresponding prefabricated segment via the corresponding embedded steel bars.

[0022] Preferably, only two of the prefabricated segments are included;

[0023] The projection range of each of the perforated steel plates inside the cushion stone under each of the bearings corresponding to the two prefabricated segments includes the first prefabricated perforated steel plate and the second prefabricated perforated steel plate respectively;

[0024] Each pair of the first prefabricated perforated steel plate and the second prefabricated perforated steel plate is fixedly connected by two connecting steel plates;

[0025] The two connecting steel plates used to connect each pair of the first prefabricated perforated steel plate and the second prefabricated perforated steel plate are respectively arranged above and below all the corresponding perforated steel bars.

[0026] More preferably, each of the pad stone connection positions of the two prefabricated segments is provided with an embedded steel plate only at an edge position close to the other prefabricated segment.

[0027] More preferably, each arc-shaped curved portion of the U-shaped steel bar is sleeved with two or more adjacent perforated steel bars.

[0028] Beneficial effects of the utility model:

[0029] The application of the utility model can improve the integrity of the cap beam, simplify the hoisting construction process, and improve the construction efficiency. It can be widely used in various municipal and highway engineering fields, and is suitable for prefabricated cap beams of bridges that are difficult to hoist as a whole or transport or have excessive weight.

[0030] The utility model improves the reliability of the connection structure of the longitudinally segmented prefabricated assembled cap beam and improves the integrity of the cap beam structure.

[0031] The utility model simplifies the construction process, reduces the complexity of construction operations, shortens the construction period, and improves construction efficiency.

[0032] The utility model does not need to install a temporary bracket during hoisting, and does not need to set up a template during pouring the connecting structural concrete, so the construction is simple and the construction quality is guaranteed.

[0033] The connection structure of the utility model is simpler, the requirements for construction accuracy are relatively low, and construction errors can be accommodated to a certain extent.

[0034] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A structural schematic diagram of an embodiment of the utility model is shown.

[0036] Figure 2 Show the utility model Figure 1 A schematic diagram of the partially enlarged cross-sectional structure of a support bottom pad at point A in the middle.

[0037] Figure 3 A schematic diagram of the cross-sectional structure of a pad stone under a support in one embodiment of the utility model is shown.

[0038] Figure 4 Show the utility model Figure 1 Schematic diagram of the partially enlarged cross-sectional structure of the cushion stone under the second type of support at A in the middle.

[0039] Figure 5 A schematic diagram of the cross-sectional structure of a second type of support underlay stone in one embodiment of the utility model is shown. DETAILED DESCRIPTION

[0040] Example

[0041] like Figures 1 to 3 As shown, the prefabricated segmented cap beam connected with the bearing pads includes two or more prefabricated segments 1 and 2 evenly distributed along the longitudinal direction of the bridge;

[0042] All prefabricated segments 1 and 2 are arranged on two or more common bridge piers 9, parallel to each other and spaced apart, and a plurality of cast-in-place support cushion stones 3 are arranged on the upper surface along the transverse direction of the bridge, and are fixedly connected by the plurality of support cushion stones 3;

[0043] The pad stone 3 under each support is a cast-in-place structure, and the internal steel bar structure includes a plurality of perforated steel plates 4 arranged along the transverse direction of the bridge, and a plurality of perforated steel bars 8 arranged along the longitudinal direction of the bridge;

[0044] Each perforated steel plate 4 is provided with a hole corresponding to each perforated steel bar 8 belonging to the same support lower pad 3, for inserting the corresponding perforated steel bar 8;

[0045] Each prefabricated segment 1, 2 is provided with a pre-buried steel plate 7 at each pad stone connection position connected to each support base pad stone 3, and is connected to the corresponding perforated steel plate 4 by welding through the corresponding pre-buried steel plate 7;

[0046] A U-shaped steel bar 6 is provided at each pad stone connection position corresponding to each perforated steel bar 8 located on one side of the corresponding perforated steel plate 4;

[0047] The arc-shaped bent portion of each U-shaped steel bar 6 is sleeved on the corresponding perforated steel bar 8, and the two straight ends are pre-buried in the pad stone connection position of the corresponding first prefabricated segment 1 of the cap beam or the corresponding second prefabricated segment 2 of the cap beam.

[0048] The utility model divides the cap beam into two or more prefabricated segments 1, 2 along the longitudinal direction of the bridge, and connects them through multiple cast-in-place support pad stones 3, thereby ensuring the integrity of the connected segmented cap beams, improving construction convenience, and improving the stress performance of the connection structure.

[0049] In some embodiments, the interval between the first prefabricated slice 1 and the second prefabricated slice 2 is 30 mm±10%.

[0050] In some embodiments, each embedded steel plate 7 is provided with embedded steel bars on one side of the corresponding prefabricated segments 1 and 2, and is fixed to the corresponding prefabricated segments 1 and 2 through the corresponding embedded steel bars.

[0051] like Figure 4 and Figure 5 As shown, in some embodiments, only two prefabricated segments 1 and 2 are included;

[0052] Each perforated steel plate 4 inside each support lower pad 3 corresponds to the projection range of the two prefabricated segments 1 and 2, and the projection range includes the first prefabricated perforated steel plate 41 and the second prefabricated perforated steel plate 42 respectively;

[0053] Each pair of the first prefabricated perforated steel plate 41 and the second prefabricated perforated steel plate 42 is fixedly connected by two connecting steel plates 5;

[0054] The two connecting steel plates 5 for connecting each pair of the first prefabricated perforated steel plate 41 and the second prefabricated perforated steel plate 42 are respectively arranged above and below all the corresponding perforated steel bars 8.

[0055] In some embodiments, each cushion stone connection position of two prefabricated segments 1 and 2 is provided with an embedded steel plate 7 only at an edge position close to the other prefabricated segment 2 .

[0056] In some embodiments, two or more adjacent perforated steel bars 8 are sleeved on the arc-shaped curved portion of each U-shaped steel bar 6 .

[0057] The utility model also provides a construction method of a prefabricated cap beam connected by a support block, comprising the following steps:

[0058] Step 1: prefabricate all prefabricated segments 1 and 2 in the factory;

[0059] Step 2: transport all prefabricated segments 1 and 2 to the site and hoist them into place on the corresponding bridge piers 9 on site;

[0060] Step 3, fix all the perforated steel plates 4 on the embedded steel plates 7 at each pad stone connection position by welding;

[0061] Step 4: corresponding perforated steel bars 8 are inserted through all the perforated steel plates 4 at all the pad stone connection positions, and other structural steel bars of the pad stone 3 under each support are tied;

[0062] Step 5: pour concrete of the pad stone 3 under each support to connect all the prefabricated segments 1 and 2 into a whole.

[0063] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. The prefabricated cap beam connected by the support block; characterized in that: It comprises two or more prefabricated segments (1, 2) evenly distributed along the longitudinal bridge direction; All the prefabricated segments (1, 2) are arranged on two or more common bridge piers (9), are arranged parallel to each other and at intervals, and are provided with a plurality of cast-in-place support underlay stones (3) along the transverse direction of the bridge, and are fixedly connected by the plurality of support underlay stones (3); Each of the support lower pads (3) is a cast-in-place structure, and the internal steel bar structure includes a plurality of perforated steel plates (4) arranged along the transverse direction of the bridge, and a plurality of perforated steel bars (8) arranged along the longitudinal direction of the bridge; Each of the perforated steel plates (4) is provided with a hole corresponding to each of the perforated steel bars (8) belonging to the same support lower pad stone (3), for inserting the corresponding perforated steel bars (8); Each of the prefabricated segments (1, 2) is provided with a pre-buried steel plate (7) at each of the pad stone connection positions connected to each of the support lower pad stones (3), and is connected to the corresponding perforated steel plate (4) by welding through the corresponding pre-buried steel plate (7); A U-shaped steel bar (6) is provided at each of the pad stone connection positions corresponding to each of the perforated steel bars (8) located on one side of the corresponding perforated steel plate (4); The arc-shaped bent portion of each U-shaped steel bar (6) is sleeved on the corresponding perforated steel bar (8), and the two straight ends are pre-buried in the pad stone connection position of the corresponding first prefabricated segment (1) of the cap beam or the corresponding second prefabricated segment (2) of the cap beam.

2. The prefabricated cap beam connected by bearing blocks according to claim 1 is characterized in that: The interval between the first prefabricated slice (1) and the second prefabricated slice (2) is 30 mm ± 10%.

3. The prefabricated cap beam connected by bearing blocks according to claim 1, characterized in that: Each of the embedded steel plates (7) is provided with embedded steel bars on one side of the corresponding prefabricated segment (1, 2), and is fixed to the corresponding prefabricated segment (1, 2) via the corresponding embedded steel bars.

4. The prefabricated cap beam connected by bearing blocks according to claim 1, characterized in that: Only two of the prefabricated segments (1, 2) are included; The projection range of each of the perforated steel plates (4) inside each of the support lower pad stones (3) corresponding to the two prefabricated segments (1, 2) respectively includes the first prefabricated perforated steel plate (41) and the second prefabricated perforated steel plate (42); Each pair of the first prefabricated perforated steel plate (41) and the second prefabricated perforated steel plate (42) is fixedly connected via two connecting steel plates (5); The two connecting steel plates (5) used for connecting each pair of the first prefabricated perforated steel plate (41) and the second prefabricated perforated steel plate (42) are respectively arranged above and below all the corresponding perforated steel bars (8).

5. The prefabricated cap beam connected by bearing blocks according to claim 4 is characterized in that: Each of the cushion stone connection positions of the two prefabricated segments (1, 2) is provided with a pre-buried steel plate (7) only at an edge position close to the other prefabricated segment (2).

6. The prefabricated cap beam connected by bearing blocks according to claim 4, characterized in that: The arc-shaped curved portion of each U-shaped steel bar (6) is sleeved with two or more adjacent perforated steel bars (8).

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