Light split hollow prefabricated assembled bent cap

Abstract

The utility model discloses a light split hollow prefabricated assembled bent cap which is characterized in that the bent cap is divided into 2-3 split assemblies in the longitudinal direction. The section of the fragmentation assembly is I-shaped, T-shaped or inverted-T-shaped, rib plates are arranged at the corresponding positions of the cushion blocks, and the rib plates are transversely connected to form a whole. After the fragmentation assemblies are assembled and combined, cavities are formed between the rib plates. Compared with the prior art, the hollow prefabricated assembled bent cap is simple in structure, light in weight of a single assembly, less in field operation, low in transverse connection requirement, and simple and convenient to produce, transport and construct; compared with a traditional solid section cover beam, the cover beam can reduce the weight by more than 20% on the whole, and has large economic benefits.

Description

Technical Field

[0001] The invention relates to the field of bridge prefabrication and assembly, and in particular to a light-weight segmented hollow prefabricated assembly cap beam. Background Art

[0002] Traditional cast-in-place bridge structure construction has been gradually replaced by prefabricated structures due to the large amount of on-site work, long construction period and great impact on the on-site environment. The use of prefabricated construction methods can greatly improve the construction speed, safety and quality, and minimize traffic interruption and environmental impact. However, with the improvement of traffic conditions, the fully prefabricated cap beam in engineering practice is severely limited by the conditions of driving transportation and lifting due to its large size and heavy weight.

[0003] The current mainstream practice is to prefabricate the entire cross-section of the cap beam in transverse sections. However, since the tensile reinforcement of the cap beam is discontinuous in sections at the splicing interface, the bending moment is mainly transmitted by prestressing, and the performance of the reinforcement cannot be fully utilized. From the perspective of on-site construction, there is no support at both ends of each prefabricated segmented cap beam during assembly, so brackets are still needed on site to support the segmented cap beams, which will still affect traffic, and the convenience of construction needs to be further improved. In addition, there are also some prefabricated cap beams that are assembled in longitudinal sections and connected by wet joints or prestressing, but there are problems such as unclear force, complex prefabrication and on-site construction.

[0004] At the same time, whether it is horizontal segmentation or vertical segmentation, the key is to use different connection methods to complete the connection of components. The overall splicing is still a solid section design, which only achieves lightweight transportation and construction, but does not achieve lightweight components. For the integral cap beam, the light cap beam with a hollow section design has problems such as the inner mold cannot be removed and reused, and the production and manufacturing are difficult. Summary of the invention

[0005] In view of the deficiencies in the art, the present invention provides a lightweight segmented hollow prefabricated assembled cap beam, which realizes a hollow design through segmented assembly, thereby achieving the goals of simple production and manufacturing, convenient transportation and construction, and less on-site workload.

[0006] To achieve the above purpose, the technical solution provided by the present invention is:

[0007] The cap beam is divided into 2-3 slice components along the longitudinal direction, and is connected transversely to form a whole. The slice components are provided with ribs at positions corresponding to the pads, and transverse screws are used at the positions of the ribs to complete the transverse connection. The ribs include inner ribs and side ribs, and holes are reserved for the screws to pass through. The high-strength screws (10) pass through the reserved holes and are initially fastened with fastening pads and nuts. The weight of each slice component is controlled within 100 tons.

[0008] Furthermore, the cross-sectional shape of the slice assembly is I-shaped, T-shaped or inverted T-shaped, and the cross-sectional size can vary along the longitudinal direction.

[0009] Furthermore, the segmented components are prestressed concrete structures, steel structures or steel-concrete composite structures.

[0010] Furthermore, the segmented component has glue injection holes reserved at the flanges for injecting glue to connect the flanges.

[0011] Furthermore, after the assembly and erection is completed, at the cap beam-pier connection, the web of the segmented assembly should be within the vertical projection range of the cross section of the lower pier.

[0012] In addition, the present invention also provides a construction method for a light-weight segmented hollow prefabricated assembled cap beam, the specific steps of which are:

[0013] Step 1: prefabricate the cap beam segment components in the factory and reserve the transverse connectors;

[0014] Step 2: transport the prefabricated segmented components to the site, clean the interface between the cap beam and the pier column, hoist each segmented component into place according to the design, complete the vertical connection between the cap beam and the pier column, and the joints can be connected by conventional technologies such as grouting sleeve connection and grouting metal bellows connection;

[0015] Step 3: Complete the cross-thread screws at the ribs and tighten them initially;

[0016] Step 4: Complete the installation of upper T-beams, box beams and other components;

[0017] Step 5: Inject glue into the reserved glue holes at the flange position, fine-tune the position of the segmented components, and finally tighten the cross-screws and grout to seal the anchors.

[0018] Compared with the prior art, the lightweight segmented hollow prefabricated assembled cap beam provided by the present invention has the following beneficial effects:

[0019] 1. The structure of the split component is simple, the force is clear, and the factory prefabrication only requires a brief adjustment of the template, without the need for grooving, reserving steel bars, etc., and the production is simple. The single-piece component is light in weight, does not require additional support on site, and is convenient for transportation and hoisting.

[0020] 2. The transverse connection of the present invention is fastened by high-strength screws, which does not require high-level prestressing, is easy to connect, causes less damage to the component itself, and requires less wet work on site.

[0021] 3. An important difficulty in adopting the longitudinal segmentation form is the problem of coordinated force of the segmented components. When the upper beam components are erected, the cap beam is subjected to eccentric force in the transverse direction, which is the most unfavorable state of the connection structure and is likely to cause damage to the connection structure. The present invention adopts transverse screw fastening, and a certain amount of misalignment is allowed between the segmented components before the final fastening. After the upper beam is erected, the final fastening and the connection at the flange are performed to avoid this most unfavorable state and reduce the requirements for the transverse connection.

[0022] 4. The design of the hollow section of the assembled cap beam can reduce the weight by more than 20% compared with the traditional solid section cap beam, thus improving the economy of the prefabricated cap beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the three-dimensional structure of the light-weight hollow prefabricated assembled cap beam of the present invention

[0024] Figure 2 This is a schematic side view of the invention being assembled in two pieces

[0025] Figure 3 This is a schematic side view of the three-piece assembly of the present invention.

[0026] Figure 4 Schematic diagram of the three-dimensional structure of the slice assembly of the present invention

[0027] Figure 5 This is a schematic diagram of the side fastening position structure of the present invention.

[0028] Legend:

[0029] 1. Pier; 2. Joint; 3. Segment assembly; 4. Spacer; 5. Flange; 6. Side rib; 7. Glue injection hole; 8. Inner rib; 9. Channel; 10. High-strength screw; 11. Fastening pad; 12. Nut. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] 1. If Figure 1 As shown, the segmented components 3 are directly installed on the top of the bridge pier 1 without any other temporary support measures. The segmented components are transported to the site, the interface between the cap beam and the pier is cleaned, and each segmented component is hoisted into place according to the design to complete the vertical connection between the cap beam and the pier. The joints can be connected by conventional technologies such as grouting sleeve connection and grouting metal bellows connection;

[0032] 2. After the segmented components are erected, the side view of the cap beam using the I-section segmented components is as follows Figure 2 (two pieces joined) or Figure 3 As shown (three pieces spliced ​​together), the view is similar when using a segmented component with a T-shaped or inverted T-shaped section.

[0033] 3. If Figure 4 As shown, inner ribs 8 and side ribs 6 are arranged at the position of the spacer 4 corresponding to the slice assembly, and a hole 9 for the screw to pass through is reserved at the rib position. The high-strength screw 10 passes through the reserved hole 9 and is initially fastened with a fastening pad 11 and a nut 12 to ensure the stability of the slice assembly during construction. A cavity is formed between the ribs to achieve a hollow weight reduction effect.

[0034] 4. After the initial tightening of the segmented components, the erection of the upper T-beam, box beam and other components is completed, and the upper structural beams of the two adjacent spans of the cap beam are erected, the segmented component 3 reaches a new force balance state. Since the upper loads on the adjacent two sides are basically the same, the deflection levels of different segmented components are also basically the same, and the relative displacement is small.

[0035] 5. Fill the reserved injection holes 7 of the flange 5 with epoxy resin and let it stand for a while to fill the gaps between the segmented components. Fine-tune the position of the high-strength screw 10 and perform final tightening. After tightening, grout the hole 9.

[0036] 6. Figure 1 — Figure 5 The size and quantity of the ribs, high-strength screws, and the arrangement of the glue injection holes can be adjusted according to the actual stress requirements of the cap beam.

[0037] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A light-weight prefabricated hollow cap beam, characterized in that: The cap beam is divided into 2-3 slice components (3) along the longitudinal direction, and is connected transversely to form a whole. The slice components (3) are provided with ribs at positions corresponding to the pads (4), and transverse connection is completed at the positions of the ribs by using transverse screws. The ribs include inner ribs (8) and side ribs (6), and holes (9) are reserved for the screws to pass through. The high-strength screws (10) pass through the reserved holes (9) and are initially fastened by fastening pads (11) and nuts (12). The weight of each slice component (3) is controlled within 100 tons.

2. A lightweight hollow prefabricated assembled cap beam according to claim 1, characterized in that: The cross-sectional shape of the slice assembly is I-shaped, T-shaped or inverted T-shaped, and the cross-sectional size can vary along the longitudinal direction.

3. A lightweight hollow prefabricated assembled cap beam according to claim 1, characterized in that: The segmented components are prestressed concrete structures, steel structures or steel-concrete composite structures.

4. A lightweight hollow prefabricated assembled cap beam according to claim 1, characterized in that: The segmented components have glue injection holes reserved at the flanges for injecting glue to connect the flanges.

5. The lightweight hollow prefabricated assembled cap beam according to claim 1 is characterized in that: After assembly and erection is completed, at the connection between the cap beam and the pier, the web of the segmented assembly should be within the vertical projection range of the cross section of the lower pier.

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