A bolted prefabricated bridge guardrail lifting and reconstruction structure

Abstract

The utility model relates to a bolted prefabricated bridge guardrail lifting and reconstruction structure, including a concrete base, prefabricated concrete beam segments, large-diameter high-strength bolts and connectors. A plurality of prefabricated concrete beam segments are arranged on the top of the concrete base, and two adjacent prefabricated concrete beam segments are connected by connectors; the connectors include L-shaped bolts, steel plates and channel steels; and large-diameter high-strength bolts are arranged inside the concrete base. The utility model retains the basic structure and slope form of the concrete base, and the main bearing capacity of the concrete base and the connection with the bridge structure remain unchanged, which effectively saves the reconstruction cost and construction period, and adds prefabricated concrete beam segments, and connectors are pre-embedded in the prefabricated concrete beam segments, so that the on-site connection operation is fast and convenient. The on-site hoisting installation greatly reduces the control time during operation, and the prefabricated concrete beam segments do not need to be cured after installation, and can quickly provide protection capabilities, reducing the impact on traffic operations during the reconstruction construction.

Description

Technical Field

[0001] The utility model relates to the technical field of highway safety protection, in particular to a bolted prefabricated bridge guardrail lifting and reconstruction structure. Background Art

[0002] Guardrails are important safety protection facilities in the field of highway traffic, preventing vehicles from running off the roadside or oncoming lanes and causing danger. Improving the safety protection capabilities of guardrails is crucial to comprehensively improving the level of highway driving safety and protecting the lives of drivers and passengers. With the rapid increase in highway traffic volume in recent years and the continuous increase in vehicle loads, traffic demand has put forward higher requirements on the protection capabilities of highway guardrails. The bridge guardrails commonly used on early highways were combined guardrails, which had lower design protection capabilities compared to current needs. In addition, after long-term service, some steel components of the guardrails were severely corroded and the concrete height was low. The risk of outward tilt after a vehicle collision was relatively high, so there was an urgent need to transform and upgrade the guardrails.

[0003] CN201520727451.5 discloses a reinforced concrete guardrail, comprising an original concrete wall, a concrete guardrail heightening section is arranged on the upper part of the original concrete wall, a plurality of embedded bars are arranged between the original concrete wall and the concrete guardrail heightening section, and the concrete guardrail heightening section is fixedly connected to the original concrete wall through the plurality of embedded bars. The existing original concrete wall is fully utilized to reduce the cost of reconstruction. However, during the reconstruction process, the steel bar embedding and concrete cast-in-place reinforcement require a long curing operation time, which has a great impact on the operating traffic.

[0004] CN201821791013.5 discloses a bridge guardrail reconstruction structure in the form of encapsulated reinforced steel bars, including an old guardrail wall and a guardrail encapsulation layer. Holes are drilled on the top surface of the old guardrail wall and upper embedded bars are set; vertical reinforcing bars are set on the front side of the old guardrail wall that faces the surface, and the guardrail encapsulation layer covers the collision surface and top surface of the old guardrail wall, and the guardrail encapsulation layer wraps the upper embedded bars and vertical reinforcing bars. Increasing the height and strength of the guardrail greatly improves the safety protection capability of the guardrail. However, the volume of the encapsulated concrete is large, which increases the load on the bridge deck; there are many drilling and embedding operations, and the on-site construction is complicated.

[0005] In summary, the above-mentioned existing technologies all have the problems of long concrete curing period and complex on-site construction, which result in the inability to quickly form protective capabilities and have a great impact on traffic operations. Based on this, the utility model provides a bolted prefabricated bridge guardrail lifting and modification structure to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a bolted prefabricated bridge guardrail lifting and modification structure to solve the technical problem that the modification method of the original guardrail in the prior art proposed in the above background technology is to cast and heighten it on a concrete base, but this method has a long concrete curing period and complex on-site construction, resulting in an inability to quickly form protective capabilities and affecting traffic operations.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A bolted prefabricated bridge guardrail lifting and reconstruction structure comprises a concrete base, a plurality of prefabricated concrete beam segments are arranged on the top of the concrete base, and two adjacent prefabricated concrete beam segments are connected by a connecting piece;

[0009] The connecting member comprises an L-shaped bolt, a steel plate and a channel steel, wherein the L-shaped bolt is arranged at the end of the precast concrete beam segment through the steel plate and the channel steel;

[0010] A large-diameter high-strength bolt is arranged in the concrete base, one end of the large-diameter high-strength bolt is inserted into the concrete base, and the other end of the large-diameter high-strength bolt extends into the precast concrete beam segment.

[0011] As a preferred solution, the L-shaped bolt includes a transverse portion and a vertical portion, one end of the transverse portion is vertically connected to one end of the vertical portion, the transverse portion is located inside the precast concrete beam segment, and the vertical portion extends to the outside of the precast concrete beam segment, the transverse portion is fixed to the steel plate, and the vertical portion is fixed to the channel steel.

[0012] As a preferred solution, the connecting member further comprises a pad, and the vertical portions of the two L-shaped bolts located at the ends of two adjacent precast concrete beam segments are fixedly connected by the pad.

[0013] As a preferred solution, cement mortar is provided at the connection between the concrete base and the precast concrete beam segment.

[0014] As a preferred solution, a plurality of steel bars are provided in the precast concrete beam segment, and the steel plate and the channel steel are fixed on the steel bars.

[0015] As a preferred solution, the precast concrete beam segments have a segment length of 4-5 m and a height of 400-450 mm.

[0016] As a preferred solution, a plurality of large-diameter high-strength bolts are provided, and the plurality of large-diameter high-strength bolts are arranged at intervals in the concrete base, with an interval distance of 440-920 mm.

[0017] It can be seen from the technical solution provided by the utility model that the bolted prefabricated bridge guardrail lifting and reconstruction structure provided by the utility model has the following beneficial effects compared with the prior art:

[0018] 1. The utility model retains the basic structure and slope form of the concrete base (the bottom of the original guardrail). The main bearing capacity of the concrete base and the connection with the bridge structure remain unchanged. Precast concrete beam segments are added to the concrete base, making the construction quality easy to control. Connectors are pre-embedded in the precast concrete beam segments, making the on-site connection operation fast and convenient, and the precast concrete beam segments can be quickly connected as a whole. The on-site hoisting installation greatly reduces the control time during operation, and the precast concrete beam segments do not need to be cured after installation, which can quickly provide protection capabilities, reduce the impact on traffic operations during the renovation construction, and effectively save renovation costs and construction period;

[0019] 2. The precast concrete beam segments are smaller in size, thus avoiding excessive load on the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structural cross-sectional view of the bolted prefabricated bridge guardrail lifting and reconstruction structure provided by the embodiment of the utility model;

[0021] Figure 2 A layout diagram of large-diameter high-strength bolts for a bolted prefabricated bridge guardrail lifting and reconstruction structure provided by an embodiment of the utility model;

[0022] Figure 3 A top view of the internal connector structure of the precast concrete beam segment of the bolted prefabricated bridge guardrail lifting and reconstruction structure provided by the embodiment of the utility model;

[0023] Figure 4 This is a cross-sectional view of the overall structure of the original guardrail provided in an embodiment of the utility model.

[0024] In the figure: 1. Concrete base; 11. Large diameter high-strength bolts; 2. Precast concrete beam segment; 21. Rebar; 31. L-shaped bolt; 311. Horizontal part; 312. Vertical part; 32. Steel plate; 33. Channel steel; 34. Pad; 4. Cement mortar; 5. Original guardrail; 51. Bullhorn handrail. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] See also Figures 1 to 3 The embodiment of the present application provides a bolted prefabricated bridge guardrail lifting and reconstruction structure, including a concrete base 1, a precast concrete beam segment 2, a large-diameter high-strength bolt 11 and a connector. A plurality of precast concrete beam segments 2 are arranged on the top of the concrete base 1, and two adjacent precast concrete beam segments 2 are connected by a connector; the connector includes an L-shaped bolt 31, a steel plate 32 and a channel steel 33, and the L-shaped bolt 31 is arranged at the end of the precast concrete beam segment 2 through the steel plate 32 and the channel steel 33; a large-diameter high-strength bolt 11 is arranged in the concrete base 1, one end of the large-diameter high-strength bolt 11 is inserted into the concrete base 1, and the other end of the large-diameter high-strength bolt 11 extends into the precast concrete beam segment 2.

[0031] Working principle and effect: During the transformation process, the concrete base 1 is the original guardrail 5 (such as Figure 4As shown in the figure, only the bullhorn handrail 51 on the upper part of the concrete base 1 is replaced. The replacement method is: a plurality of precast concrete beam segments 2 connected together are added above the concrete base 1, and the precast concrete beam segments 2 and the concrete base 1 are fixedly connected by large-diameter high-strength bolts 11, and then the adjacent concrete beam segments are fixedly connected by connecting parts. Specifically, L-shaped bolts 31 are embedded in the ends of the precast concrete beams and fixed in position by steel plates 32 and channel steels 33. Finally, the L-shaped bolts 31 at the ends of two adjacent precast concrete beams are fixedly connected into a whole, and the renovation construction of the guardrail can be completed.

[0032] Compared with the prior art, the utility model retains the basic structure and slope form of the concrete base 1 (original guardrail 5), the main bearing capacity of the concrete base 1 and the connection with the bridge structure remain unchanged, and a precast concrete beam segment 2 is added to the concrete base 1, so that the construction quality is easy to control, and the precast concrete beam segment 2 is pre-embedded with connecting parts, so that the on-site connection operation is fast and convenient, and the precast concrete beam segment 2 can be quickly connected as a whole. The on-site hoisting installation greatly reduces the control time during operation, and the precast concrete beam segment 2 does not need to be cured after installation, and can quickly provide protection capabilities, reducing the impact on traffic operations during the renovation construction period, and effectively saving renovation costs and construction period; the precast concrete beam segment 2 is relatively small in size and the load added to the bridge is limited.

[0033] Furthermore, the use of large-diameter high-strength bolts 11 instead of small-diameter bolts can effectively reduce the number of bolts and reduce the difficulty of on-site hole drilling, rebar planting, hole hoisting and other operations, which is beneficial to quality control and maintenance material preparation, and can also significantly improve the bolts' resistance to bending and shear deformation, and strengthen the connection between the precast concrete beam and the concrete base 1.

[0034] Furthermore, the diameter of the large-diameter high-strength bolt 11 is 45 mm.

[0035] Furthermore, the large-diameter high-strength bolts 11 are implanted into the concrete foundation 1 to a depth of 455 mm.

[0036] In one embodiment, Figure 3As shown, the L-shaped bolt 31 includes a transverse portion 311 and a vertical portion 312, one end of the transverse portion 311 and one end of the vertical portion 312 are vertically connected, the transverse portion 311 is located inside the precast concrete beam segment 2, and the vertical portion 312 extends to the outside of the precast concrete beam segment 2, the transverse portion 311 is fixed on the steel plate 32, and the vertical portion 312 is fixed on the channel steel 33. The steel plate 32, the channel steel 33 and the L-shaped bolt 31 are all embedded in the precast concrete beam segment 2, and the L-shaped bolt 31 is fixed by the steel plate 32 and the channel steel 33, wherein the transverse portion 311 of the L-shaped bolt 31 is arranged in parallel along the length direction of the precast concrete beam segment 2, one end of the vertical portion 312 of the L-shaped bolt 31 is vertically connected to one end of the transverse portion 311 and extends to the outside of the precast concrete beam segment 2, the transverse portion 311 is fixed on the steel plate 32, and the vertical portion 312 passes through the channel steel 33 and is fixed on the channel steel 33; when a vehicle collides with the precast concrete beam segment 2, the steel plate 32 can prevent the transverse portion 311 from bending, and the channel steel 33 can prevent the vertical portion 312 from bending, thereby enhancing the impact resistance of the precast concrete beam segment 2.

[0037] In one embodiment, Figure 3 As shown, the connector also includes a pad 34, and the vertical portions 312 of the two L-shaped bolts 31 located at the ends of two adjacent precast concrete beam segments 2 are fixedly connected through the pad 34. The embedded L-shaped bolt 31 is connected and fixed to the embedded L-shaped bolt 31 at the end of the precast concrete beam segment 2 of the other segment through the pad 34. The connector is mainly embedded, and the on-site connection operation is fast and convenient, and the precast concrete beam segments 2 can be quickly connected as a whole to bear force.

[0038] In one embodiment, Figure 1 As shown, cement mortar 4 is provided at the connection between the concrete base 1 and the precast concrete beam segment 2. Since the concrete base 1 (the bottom of the original guardrail 5) is cast-in-place, the surface flatness is low after long-term use, and there is an incomplete interface between the concrete base 1 and the precast concrete beam segment 2. Therefore, it is necessary to roughen the surface of the concrete base 1 and level it with cement mortar 4 to increase the degree of interface adhesion, so that the impact force of the vehicle can be more evenly transmitted between the concrete base 1 and the precast concrete beam segment 2 during the collision process, avoiding local stress concentration and structural damage caused by.

[0039] In one embodiment, a plurality of steel bars 21 are provided in the precast concrete beam segment 2, and a steel plate 32 and a channel steel 33 are fixed on the steel bars 21. Figure 1As shown, 8 steel bars 21 can be set, and the setting direction of the steel bars 21 is set parallel to the length direction of the precast concrete beam segment 2. The 8 steel bars 21 are divided into two groups, each group is provided with 4 steel bars 21, and the 4 steel bars 21 in each group are distributed in an array. The two groups of steel bars 21 are symmetrically arranged, and the two groups of steel bars 21 are provided with binding wires outside. The binding wires are arranged around the 8 steel bars 21 to fix the steel bars 21. After the steel bars 21 are fixed, the steel plate 32 and the channel steel 33 are fixed by the steel bars 21. The precast concrete beam segment 2 is framed by using the embedded steel bars 21, and cement is poured on the steel bars 21 to form a precast part of the concrete beam segment.

[0040] In one embodiment, the precast concrete beam segments 2 have a segment length of 4-5 m and a height of 400-450 mm.

[0041] Furthermore, the precast concrete beam segment 2 has a length of 4.2 m and a height of 405 mm.

[0042] In one embodiment, a plurality of large-diameter high-strength bolts 11 are provided, and the plurality of large-diameter high-strength bolts 11 are arranged at intervals in the concrete base 1, with an interval distance of 440-920 mm. The large-diameter high-strength bolts 11 are arranged at intervals, effectively and evenly transmitting the force received by the precast concrete beam segment 2 to the concrete base 1, and better exerting the role of the overall coordinated force of the guardrail.

[0043] Furthermore, (such as Figure 2 As shown), six large-diameter high-strength bolts 11 can be arranged in each 4.2m segment of the precast concrete beam, with two bolts forming a group, and the distance between the two bolts in each group is 440mm, and the distance between the center lines of the group is 1360mm.

[0044] Furthermore, the specific steps of the construction and transformation of the bolted prefabricated bridge guardrail lifting and transformation structure provided by the utility model are as follows:

[0045] Step 1: Remove the upper horn handrail 51 of the original guardrail 5 (such as Figure 4 shown);

[0046] Step 2, the upper part of the concrete base 1 of the original guardrail 5 is roughened and leveled with cement mortar 4, and large-diameter high-strength bolts 11 are implanted in holes in the concrete base 1;

[0047] Step 3, using a precast concrete beam segment 2 to be installed on the concrete base 1 to increase the height, large-diameter high-strength bolts 11 pass through the precast concrete beam segment 2, and the precast concrete beam segment 2 is locked and fixed;

[0048] Step 4, connecting and fixing adjacent precast concrete beam segments 2, the precast concrete beam segments 2 are fixed with connectors, specifically, Figure 3As shown, the pad 34 is fixed to the vertical portion 312 of the L-shaped bolts 31 at the ends of two adjacent precast concrete beam segments 2 by bolts.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bolted prefabricated bridge guardrail lifting and reconstruction structure, comprising a concrete base (1), characterized in that: The concrete base (1), wherein a plurality of precast concrete beam segments (2) are arranged on the top of the concrete base (1), and two adjacent precast concrete beam segments (2) are connected via a connecting piece; The connecting member comprises an L-shaped bolt (31), a steel plate (32) and a channel steel (33); the L-shaped bolt (31) is arranged at the end of the precast concrete beam segment (2) through the steel plate (32) and the channel steel (33); A large-diameter high-strength bolt (11) is provided in the concrete base (1), one end of the large-diameter high-strength bolt (11) is inserted into the concrete base (1), and the other end of the large-diameter high-strength bolt (11) extends into the precast concrete beam segment (2).

2. The bolted prefabricated bridge guardrail lifting and reconstruction structure according to claim 1 is characterized in that: The L-shaped bolt (31) comprises a transverse portion (311) and a vertical portion (312), one end of the transverse portion (311) and one end of the vertical portion (312) being vertically connected, the transverse portion (311) being located inside the precast concrete beam segment (2), and the vertical portion (312) extending to the outside of the precast concrete beam segment (2), the transverse portion (311) being fixed on the steel plate (32), and the vertical portion (312) being fixed on the channel steel (33).

3. The bolted prefabricated bridge guardrail lifting and reconstruction structure according to claim 2 is characterized in that: The connecting member further comprises a pad (34), and the vertical portions (312) of the two L-shaped bolts (31) located at the ends of two adjacent precast concrete beam segments (2) are fixedly connected via the pad (34).

4. The bolted prefabricated bridge guardrail lifting and reconstruction structure according to claim 3 is characterized in that: Cement mortar (4) is provided at the connection between the concrete base (1) and the precast concrete beam segment (2).

5. The bolted prefabricated bridge guardrail lifting and reconstruction structure according to claim 1 is characterized in that: A plurality of steel bars (21) are arranged in the precast concrete beam segment (2), and the steel plate (32) and the channel steel (33) are fixed on the steel bars (21).

6. The bolted prefabricated bridge guardrail lifting and reconstruction structure according to claim 1 is characterized in that: The precast concrete beam segments (2) have a segment length of 4-5 m and a height of 400-450 mm.

7. The bolted prefabricated bridge guardrail lifting and reconstruction structure according to claim 1 is characterized in that: A plurality of large-diameter high-strength bolts (11) are provided, and the plurality of large-diameter high-strength bolts (11) are arranged at intervals in the concrete base (1), with an interval distance of 440-920 mm.

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