Assembled earthquake-resistant facility for bridge main beam

Abstract

The present invention discloses an assembled earthquake-resistant facility for a bridge main beam, wherein an earthquake-resistant steel anchor rod is embedded on the top of the lower structure, and four steel anchor rods are embedded on the bottom surface of the upper structure. The four steel anchor rods embedded on the bottom surface of the upper structure are distributed in a rectangular shape, and the earthquake-resistant steel anchor rod of the lower structure is arranged in the middle position relative to the four steel anchor rods embedded in the upper structure. Through the fixing holes at both ends of the four steel pads, the upper embedded steel anchor rods are connected in pairs in sequence, and the four steel pads are fixed to the upper embedded steel plate respectively by bolts, so as to surround the earthquake-resistant steel anchor rod of the lower structure to form a closed limiting space; the upper end of the earthquake-resistant steel anchor rod passes through the fixing hole of a fifth steel pad, and the fifth steel pad is fixed by bolts so as to overlap the upper end surfaces of two symmetrical steel pads among the four steel pads. The present invention can solve the technical problems of various traditional bridge earthquake-resistant facilities, such as complex structure, poor applicability, difficulty in installation and difficulty in embedding.

Description

Technical Field

[0001] The invention relates to an improvement technology for bridge structure construction, in particular to the field of earthquake-resistant technology for bridge main beams. Background Art

[0002] The design of earthquake-resistant facilities is a very important part of bridge design. For conventional bridges, the main types of earthquake-resistant facilities include concrete block-type earthquake-resistant facilities, plug-in-type earthquake-resistant facilities, embedded steel rods plus reserved grooves, and so on.

[0003] Research on existing earthquake-resistant facilities shows that they are generally complex in structure, poor in applicability, difficult to install, and difficult to embed. In engineering applications, new earthquake-resistant facilities with stronger applicability, easier installation, and simpler embedding are expected. Summary of the invention

[0004] The purpose of the present invention is to provide an assembled seismic facility for a bridge main beam to solve the technical problems of various traditional bridge seismic facilities, such as complex structure, poor applicability, difficulty in installation and difficulty in pre-embedding.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0006] An assembled earthquake-resistant facility for a bridge main beam comprises a vertical earthquake-resistant steel anchor rod embedded in the top of a lower structure, and four vertical steel anchor rods embedded in the bottom of an upper structure. The four steel anchor rods embedded in the bottom of the upper structure are distributed in a rectangular shape. The earthquake-resistant steel anchor rod of the lower structure is arranged in the middle position relative to the four steel anchor rods embedded in the upper structure. The upper embedded steel anchor rods are connected in pairs in sequence through the fixing holes at both ends of four steel pads, and the four steel pads are fixed to the upper embedded steel plate respectively by bolts, thereby embracing the earthquake-resistant steel anchor rod of the lower structure to form a closed limiting space. The upper end of the earthquake-resistant steel anchor rod passes through the fixing hole of a fifth steel pad, and the fifth steel pad is fixed by bolts so as to overlap the upper end surfaces of two symmetrical steel pads among the four steel pads.

[0007] The four steel pads are a rectangular distribution structure with adjacent sides of unequal lengths matching the four steel anchor rods.

[0008] The diameters of the four steel anchor rods pre-buried on the bottom surface of the upper structure are smaller than the earthquake-resistant steel anchor rods pre-buried on the top of the lower structure.

[0009] The lower structure includes a pier cap beam or a lower bullhorn, and the upper structure includes a main beam or an upper bullhorn.

[0010] The present invention has the following advantages:

[0011] 1. The combined structure of pre-embedded anchor rods and pads is used to form an earthquake-resistant facility system, which increases the scope of application and can be applied to a variety of bridge main beam structures.

[0012] 2. The combination of embedded anchor bolts and welded anchor bars reduces the number of embedded components in the cap beam and main beam, and avoids the conflict between embedded bars and structural steel bars to the greatest extent;

[0013] 3. Through the structural treatment of the steel pad in the present invention, the main beam has a certain amount of activity space in both the longitudinal and transverse directions during the normal use of the bridge. For example, the above-mentioned facilities can reserve +100mm of activity space in the longitudinal direction and +30mm in the transverse direction. By setting a combination design between the embedded anchor bolts and the pad, the seismic facility has a vertical pull-out resistance function;

[0014] 4. This earthquake-resistant facility uses assembled components, some of which can be replaced if damaged, reducing the construction of large components, reducing the demand for installation space, reducing the difficulty of installation, and facilitating workers' construction and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the present invention.

[0016] Figure 2 yes Figure 1 Cross-section along AA direction.

[0017] Figure 3 yes Figure 1 Cross-section along direction BB.

[0018] Figure 4 yes Figure 3 Enlarged view of the center part C.

[0019] Figure 5 It is a schematic diagram of a pair of longer steel plates among the four steel plates described in the present invention.

[0020] Figure 6 yes Figure 5 Top view of the .

[0021] Figure 7 It is a schematic diagram of a pair of shorter steel plates among the four steel plates described in the present invention.

[0022] Figure 8 yes Figure 7 Top view of the .

[0023] Numbers in the figure: 1 is an earthquake-resistant steel anchor rod, 2, 3, 4, 5 are four steel anchor rods, 6 is the fifth steel washer, 7 is a short washer of the four steel washers, 8 is a long washer of the four steel washers, 9 is another short washer of the four steel washers, 10 is another long washer of the four steel washers, 11 is one of the nuts, 12 is the second nut, 13 is the third nut, 14 is the fourth nut, 15 is the main beam or upper horn, 16 is the abutment cap beam or lower horn. DETAILED DESCRIPTION

[0024] For a specific structural example of the assembled seismic-resistant facility of a bridge main beam described in the present invention, see Figure 1 , 2 , 3. A vertical seismic steel anchor rod is embedded in the top of the lower structure, and four vertical steel anchor rods are embedded in the bottom of the upper structure. The four steel anchor rods embedded in the bottom of the upper structure are distributed in a rectangular shape. The seismic steel anchor rod of the lower structure is arranged in the middle position relative to the four steel anchor rods embedded in the upper structure. The upper embedded steel anchor rods are connected in pairs in sequence through the fixing holes at both ends of the four steel pads, and the four steel pads are fixed to the upper embedded steel plates respectively with bolts, so as to surround the seismic steel anchor rods of the lower structure to form a closed limit space.

[0025] See also Figure 4 As shown, the upper end of the seismic steel anchor rod passes through a fixing hole of a fifth steel plate, and the fifth steel plate is fixed by bolts so as to overlap the upper end surfaces of two symmetrical steel plates among the above four steel plates.

[0026] See also Figure 5 , 6 As shown in , 7 and 8, the four steel plates are a rectangular distribution structure with adjacent sides of unequal lengths matching the four steel anchor rods.

[0027] The diameters of the four steel anchor rods pre-buried on the bottom surface of the upper structure are smaller than the earthquake-resistant steel anchor rods pre-buried on the top of the lower structure.

[0028] The lower structure includes piers or cap beams, and the upper structure includes main beams.

[0029] like Figure 1 , 2 In the embodiment shown in Figure 3, an anchor rod 1 with a diameter of 64 mm is embedded in the pier column or cap beam, and four anchor rods 2, 3, 4, 5 with a diameter of 48 m are embedded in the main beam of the upper structure.

[0030] The construction process is as follows:

[0031] 1. Pre-embed the seismic steel anchor rod 1 and cast the lower structure;

[0032] 2. Use the positioning device to position each component, embed the steel anchor rod 2, and assemble the nuts 11, 12, 13, 14, four pads 7, 8, 9, 10 in sequence; then install the fifth pad 6, tighten each component, and fill the nut end with sealant;

[0033] 3. Cast the superstructure and remove the positioning device after the superstructure concrete reaches sufficient strength.

[0034] The adjustable contents in the structural measures of the present invention are mainly in three aspects:

[0035] 1. The seismic facilities of the above-mentioned bridges can be optimized according to the seismic requirements of the project, such as the diameter of the anchor bolts, the size and thickness of the anchor pads, so as to meet the needs of the corresponding project.

[0036] 2. The embedded position of steel anchor rods can be adjusted according to the needs of the longitudinal and lateral activities of the bridge;

[0037] 3. The materials of each component can be selected according to actual conditions. To ensure service life, materials with better durability should be used as much as possible.

Claims

1. An assembled seismic-resistant facility for a bridge main beam, characterized in that: A vertical anti-seismic steel anchor rod is embedded in the top of the lower structure, and four vertical steel anchor rods are embedded in the bottom of the upper structure. The four steel anchor rods embedded in the bottom of the upper structure are distributed in a rectangular shape. The anti-seismic steel anchor rod of the lower structure is arranged in the middle position relative to the four steel anchor rods embedded in the upper structure. The upper embedded steel anchor rods are connected in pairs in sequence through the fixing holes at both ends of the four steel pads, and the four steel pads and the upper embedded steel plates are fixed with bolts respectively, so as to embrace the anti-seismic steel anchor rod of the lower structure to form a closed limiting space; the upper end of the anti-seismic steel anchor rod passes through the fixing hole of a fifth steel pad, and the fifth steel pad is fixed by bolts so as to overlap the upper end surfaces of two symmetrical steel pads among the four steel pads; through the steel pad structure, the main beam has a certain movable space in the longitudinal and transverse directions during the normal use of the bridge.

2. The assembled earthquake-resistant facility for a bridge main beam according to claim 1, characterized in that: The four steel pads are a rectangular distribution structure with adjacent sides of unequal lengths matching the four steel anchor rods.

3. The assembled earthquake-resistant facility for a bridge main beam according to claim 1, characterized in that: The diameters of the four steel anchor rods pre-buried on the bottom surface of the upper structure are smaller than the earthquake-resistant steel anchor rods pre-buried on the top of the lower structure.

4. The assembled earthquake-resistant facility for a bridge main beam according to claim 1, characterized in that: The lower structure includes piers, cap beams or lower bullhorns, and the upper structure includes main beams or upper bullhorns.

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