An assembled bridge guardrail

Abstract

The present invention relates to a prefabricated bridge guardrail, which includes a precast bridge deck and a precast guardrail; the precast guardrail is provided with a reserved channel penetrating through its bottom surface, and corresponding to the reserved channel, the precast bridge deck is provided with an adjustable embedded part protruding upward; the adjustable embedded part includes a steel plate, a bolt sliding box, and a bolt. The bolt sliding box is connected to the bottom surface of the steel plate, and the steel plate is provided with an oval long hole communicating with the inner cavity of the bolt sliding box. The length direction of the oval long hole is parallel to the distribution direction of the adjustable embedded part; the bolt is vertically arranged and includes a bolt head and a screw rod. The bolt head is located inside the bolt sliding box, and the screw rod passes through the oval long hole and penetrates into the reserved channel. In this bridge guardrail, the bolt can slide in the bolt sliding box along the oval long hole, so that the position of the embedded part inserted into the reserved channel can be adjusted, thereby being able to correct the position deviation between the embedded part and the reserved channel and improving the success rate of the connection between the precast guardrail and the precast bridge deck.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly relates to a prefabricated bridge guardrail. Background Art

[0002] A bridge guardrail refers to a guardrail installed on a bridge. Its purpose is to prevent out-of-control vehicles from going out of the bridge, and it has the functions of preventing vehicles from breaking through, passing under, or climbing over the bridge, as well as beautifying the bridge structure.

[0003] Compared with preparing a guardrail by on-site anchor bar binding and cast-in-place concrete, a prefabricated and assembled guardrail has the advantages of easy construction quality control and fast construction speed. The connection structure between the prefabricated guardrail and the prefabricated bridge deck is a key technology. At present, the connection structures of most of them are realized by the adaptation of the reserved channels in the prefabricated guardrail and the embedded parts on the prefabricated bridge deck. In on-site construction, although it is not difficult to make the embedded parts and the reserved channels distributed in a straight line, the interval between the embedded parts is prone to deviation compared with the interval between the reserved channels, and the embedded parts do not correspond to the reserved channels, thus resulting in the inability to install the prefabricated guardrail. Summary of the Invention

[0004] To solve the problems in the background art, the present invention provides a prefabricated bridge guardrail, which includes a prefabricated bridge deck and a plurality of prefabricated guardrails arranged on the prefabricated bridge deck. The plurality of prefabricated guardrails are arranged along their own length directions; the prefabricated guardrail is provided with a plurality of reserved channels penetrating through its bottom surface along its length direction. Corresponding to each of the reserved channels, the prefabricated bridge deck is provided with adjustable embedded parts protruding upward; the adjustable embedded parts include a steel plate, a bolt sliding box, and a bolt. The steel plate is flush with the upper surface of the prefabricated bridge deck, and the bolt sliding box is connected to the bottom surface of the steel plate; the steel plate is provided with an oval long hole communicating with the inner cavity of the bolt sliding box, and the length direction of the oval long hole is parallel to the distribution direction of the adjustable embedded parts; the bolt is vertically arranged and includes a bolt head and a screw rod. The bolt head is located inside the bolt sliding box, and the screw rod passes through the oval long hole and penetrates into the reserved channel.

[0005] The bolt sliding box in the adjustable embedded part and the oval long hole on the steel plate provide a sliding track for the bolt. The steel plate is located on the upper surface of the prefabricated bridge deck to prevent the oval long hole from being covered by the material for pouring the prefabricated bridge deck. The length direction of the oval long hole is parallel to the distribution direction of the adjustable embedded parts, that is, parallel to the length direction of the prefabricated guardrail. When there is a deviation between the interval between the adjustable embedded parts and the interval between the reserved channels, the bolt can be slid to change the distance between the bolts, so that the part of the adjustable embedded part extending out of the bridge deck corresponds to the reserved channel and can penetrate into the reserved channel.

[0006] Preferably, corresponding to each of the reserved channels, square grooves are respectively formed on the inner side surface of the precast guardrail, and the square grooves communicate with the tops of the reserved channels.

[0007] Preferably, the end of the screw rod extends into the inner cavity of the square groove, and the screw rod is fixed by a steel gasket and a nut sleeved on its end; the area of the steel gasket is larger than the cross-sectional area of the reserved channel, and a plurality of grouting holes communicating with the reserved channel are formed through the steel gasket.

[0008] Preferably, the reserved channel is formed by the inner cavity of a pipe fitting embedded in the precast guardrail.

[0009] Preferably, the pipe fitting is a PVC pipe.

[0010] Preferably, the precast guardrail and the precast bridge deck are connected into a whole by injecting cement slurry into the reserved channel along the grouting holes and pouring non-shrinkage fine aggregate concrete into the square groove.

[0011] After the screw rod penetrates into the reserved channel, that is, after the screw rod penetrates into the PVC pipe, there is a gap between the screw rod and the inner wall of the PVC pipe. In order to reinforce the connection between the precast guardrail and the precast bridge deck, it is necessary to fill the above-mentioned gap with cement slurry. The grouting holes are formed through the steel gasket, and the cement slurry is filled into the inner cavity of the PVC pipe through the grouting holes. The bolt sliding box communicates with the PVC pipe through the oval long hole, so the cement slurry can fill the bolt sliding box and the gap between the screw rod and the inner wall of the PVC pipe. After the reserved channel and the bolt sliding box are filled with cement slurry, the inner cavity of the square groove is poured with non-shrinkage fine aggregate concrete. The non-shrinkage fine aggregate concrete refers to the fine aggregate concrete added with an appropriate amount of micro-expansion agent. The expansion effect of the expansion agent can offset the shrinkage deformation of the concrete during the later stage of setting and hardening, and prevent cracks from appearing.

[0012] Preferably, the length of the oval long hole is 8 cm.

[0013] The length of the oval long hole is set to 8 cm. This length includes the cross-sectional diameter of the screw rod and the range that the screw rod needs to be adjusted. Since the deviation between the reserved part and the reserved channel is mostly within 1 cm, the setting of the length of the oval long hole can meet the corresponding requirements of the reserved part and the reserved channel.

[0014] Preferably, a plurality of anchor bars extend downward from the bottom of the steel plate. The anchor bars include a vertical part and a bent part, and the bent part faces the outside of the steel plate. The setting of the anchor bars can strengthen the connection between the embedded part and the precast bridge deck. Since the precast guardrail is connected to the precast bridge deck through the embedded part, the anchor bars enhance the connection between the precast guardrail and the precast bridge deck, and improve the stability of the assembled bridge guardrail.

[0015] Preferably, a stop block is prominently provided on the upper surface of the precast bridge deck. The stop block is parallel to the arrangement direction of the precast guardrail, and a matching stop block groove is provided along the length direction at the bottom of the outer side of the precast guardrail; an epoxy mortar layer I is laid between the stop block and the stop block groove.

[0016] Preferably, shear keys and shear key grooves are respectively provided on the opposite side surfaces of the precast guardrail along its length direction; two adjacent precast guardrails are in contact, and the shear key of one precast guardrail is inserted into the shear key groove of the other precast guardrail; an epoxy mortar layer II is laid between the shear key and the shear key groove.

[0017] The epoxy mortar layer can fill the gaps existing between the contact parts of the precast guardrail and the precast bridge deck and between adjacent precast guardrails, playing a waterproofing role and avoiding the erosion of the interior of the assembled bridge guardrail by accumulated water.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. In the assembled precast guardrail provided by the present invention, the bolts in the embedded parts can slide in the bolt sliding box along the length direction of the elliptical long hole, and by changing the position of the bolts, the positions of the bolts and the PVC pipes in the precast guardrail can be made corresponding, correcting the position deviation between the embedded parts and the reserved channels, and improving the connection reliability between the precast guardrail and the precast bridge deck.

[0020] 2. The assembled precast guardrail provided by the present invention can improve the success rate of assembling the precast guardrail and the precast bridge deck, avoid the problem of impossible assembly caused by the non-correspondence between the traditional fixed embedded parts and the reserved channels, and improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the front view of an assembled bridge guardrail of the present invention.

[0022] Figure 2 is Figure 1 the partial enlarged view at A in

[0023] Figure 3 is the side view of an assembled bridge guardrail of the present invention.

[0024] Figure 4 is the top view of the steel plate in the adjustable embedded part.

[0025] Figure 5 is the top view of the contact part between two adjacent precast guardrails.

[0026] Description of reference numerals: 1, precast guardrail; 111, reserved channel; 112, square groove; 12, block groove; 13, shear key; 14, shear key groove; 2, precast bridge deck; 21, block; 31, steel plate; 311, oval long hole; 312, anchor bar; 32, bolt sliding box; 33, bolt; 331, bolt head; 332, bolt rod; 333, steel gasket; 334, nut; 41, epoxy mortar layer I; 42, epoxy mortar layer II. Detailed implementation mode

[0027] The following further elaborates on the present invention in conjunction with the attached Figures 1-5 For convenience of description, the "upper" and "lower" directions cited below are consistent with the upper and lower directions of the attached drawings themselves.

[0028] Refer to Figures 1-5 A prefabricated bridge guardrail includes a precast bridge deck 2 and a plurality of precast guardrails 1 arranged on the bridge deck. The plurality of precast guardrails 1 are arranged along their own length directions, and two adjacent precast guardrails 1 are in contact with each other; convex shear keys 13 and concave shear key grooves 14 are respectively arranged on the opposite sides of each precast guardrail 1 along its length direction. When two adjacent precast guardrails 1 are in contact with each other, the shear key 13 of one precast guardrail 1 is inserted into the shear key groove 14 of the other precast guardrail 1, and an epoxy mortar layer II 42 is laid between the inserted shear key 13 and shear key groove 14.

[0029] The precast guardrail 1 and the precast bridge deck 2 are connected by the adaptation of adjustable embedded parts and the reserved channels 111; a plurality of reserved channels 111 are arranged on the precast guardrail 1 along its length direction, and the bottom of the reserved channels 111 penetrates through the bottom surface of the precast guardrail 1; corresponding to each reserved channel 111, square grooves 112 are respectively opened on the inner side surface of the precast guardrail 1, and the square grooves 112 communicate with the top of the reserved channels 111.

[0030] The reserved channel 111 is formed by the inner cavity of a PVC pipe embedded in the precast guardrail 1.

[0031] The adjustable embedded parts of the precast bridge deck 2 correspond to the reserved channels 111 of the precast guardrail 1, that is, the adjustable embedded parts of the precast bridge deck 2 correspond to the PVC pipes in the precast guardrail 1; the adjustable embedded parts include a steel plate 31, a bolt sliding box 32, and a bolt 33. The steel plate 31 is flush with the upper surface of the precast bridge deck 2, and the bolt sliding box 32 is connected to the bottom surface of the steel plate 31; a plurality of anchor bars 312 extend downward from the bottom of the steel plate 31, and the anchor bars 312 are connected to the steel plate 31 by perforation plug welding. The anchor bars 312 include a vertical part and a bent part, and the bent part faces the outside of the steel plate 31; an oval long hole 311 communicating with the bolt sliding box 32 is penetrated through the steel plate 31, and the length of the oval long hole 311 is 8 cm, and its length direction is parallel to the distribution direction of the adjustable embedded parts.

[0032] The bolt 33 includes a bolt head 331 and a screw rod 332. The bolt head 331 is located inside the bolt sliding box 32. The screw rod 332 is vertically arranged and passes through the oval long hole 311 and extends above the precast bridge deck 2. The width of the oval long hole 311 is the same as the cross-sectional diameter of the screw rod 332.

[0033] The screw rods 332 of each adjustable embedded part are respectively inserted into the PVC pipes of the precast guardrail 1. The end of the screw rod 332 extends into the inner cavity of the square groove 112 and is fixed by a steel gasket 333 and a nut 334 sleeved on the end of the screw rod 332. The area of the steel gasket 333 is larger than the cross-sectional area of the inner cavity of the PVC pipe, and a plurality of grouting holes communicating with the inner cavity of the PVC pipe are arranged through the steel gasket 333.

[0034] A stop block 21 is prominently provided on the upper surface of the precast bridge deck 2. The stop blocks 21 are distributed along the arrangement direction of the precast guardrail 1 on the precast bridge deck 2. A stop block groove 12 is arranged along the length direction at the bottom of the outer side surface of the precast guardrail 1. An epoxy mortar layer I 41 is laid between the abutted stop block 21 and the stop block groove 12.

[0035] The implementation principle of this embodiment is as follows:

[0036] The precast bridge deck 2 and the precast guardrail 1 are connected by the adaptation of the embedded parts and the reserved channels 111. The reserved channels 111 are distributed at intervals along the length direction of the precast guardrail. The embedded parts and the reserved channels 111 are correspondingly distributed, but there may be deviations in the intervals between the embedded parts compared with the intervals between the reserved channels 111.

[0037] In this embodiment, the bolt 33 of the embedded part can slide in the bolt sliding box 32 along the length direction of the oval long hole 311, so that the part of the embedded part inserted into the reserved channel 111 can be adjusted. By changing the position of the bolt 33 to correct the position deviation between the embedded part and the reserved channel 111, the position correspondence between the bolt 33 and the PVC pipe in the precast guardrail can be realized, which can improve the reliability and success rate of the connection between the precast guardrail 1 and the precast bridge deck 2.

[0038] Particularly, the length of the oval long hole 311 is 8 cm. This length includes the cross-sectional diameter of the screw rod 332 and its adjustable range. Since the deviation between the embedded part and the reserved channel 111 is mostly within 1 cm, most of the deviation correction requirements of the embedded parts can be met.

[0039] The above precast guardrail 1 and precast bridge deck 2 are assembled through the following steps:

[0040] 1) Slide the bolt 33 of the adjustable embedded part along the length direction of the oval long hole 311 to make each bolt 33 correspond to the PVC pipe of the precast guardrail 1.

[0041] 2) Roughly chisel the surface of the retaining block 21 of the precast bridge deck 2 and the inner surface of the retaining block groove 12 of the precast guardrail 1 to form a rough surface with a chiseled pit depth of not less than 6 mm, and lay epoxy mortar on the rough surface where the chiseled pits are formed; roughly chisel the surface of the shear key 13 and the inner surface of the shear key groove 14 of two adjacent precast guardrails 1 respectively to form a rough surface with a chiseled pit depth of not less than 6 mm, and lay epoxy mortar on the rough surface where the chiseled pits are formed. The epoxy mortar plays a waterproof role and can protect the inside of the assembled bridge guardrail from being eroded by accumulated water.

[0042] 3) Move the precast guardrail 1 onto the precast bridge deck 2, adjust the position of the precast guardrail 1 so that each screw 332 passes through the PVC pipe of the precast guardrail 1 respectively. At the same time, the retaining block 21 of the precast bridge deck is inserted into the retaining block groove 12 of the precast guardrail, and the shear key 13 at the abutting part of two adjacent precast guardrails is inserted into the shear key groove 14.

[0043] 4) Through the square groove 112 of the precast guardrail, sleeve the steel gasket 333 and the nut 334 onto the end of the screw 332 in sequence, and rotate the nut 334 to apply a pre-tightening force.

[0044] 5) Inject C50 cement slurry into the PVC pipe through the grouting hole on the steel gasket 333. The PVC pipe communicates with the bolt sliding box 32 through the oval long hole 311, and the C50 cement slurry can fill the inner cavity of the bolt sliding box 32 and the gap between the screw 332 and the inner wall of the PVC pipe.

[0045] 6) Tighten the nut 334 before the initial setting of the C50 cement slurry.

[0046] 7) After the C50 cement slurry solidifies, pour the inner cavity of the square groove 112 full of non-shrinkage fine aggregate concrete, and pour a surface flush with the inner side surface of the precast guardrail 1 at the opening of the square groove 112. Non-shrinkage fine aggregate concrete refers to fine aggregate concrete added with an appropriate amount of micro-expansion agent. The expansion effect of the expansion agent can offset the shrinkage deformation of the concrete during the later stage of setting and hardening.

[0047] After the non-shrinkage fine aggregate concrete solidifies, the position between the precast guardrail 1 and the precast bridge deck 2 is fixed.

[0048] The above are all the preferred embodiments of this application. It does not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An assembled bridge guardrail, comprising a precast bridge deck (2) and a plurality of precast guardrails (1) arranged on the precast bridge deck (2), the plurality of precast guardrails (1) being arranged along their own length directions, characterized in that: The precast guardrail (1) is provided with a plurality of reserved channels (111) penetrating through its bottom surface along its length direction; corresponding to the reserved channels (111), the precast bridge deck (2) is provided with adjustable embedded parts protruding upward. The adjustable embedded part includes a steel plate (31), a bolt sliding box (32), and a bolt (33). The steel plate (31) is flush with the upper surface of the precast bridge deck (2), and the bolt sliding box (32) is connected to the bottom surface of the steel plate (31); an oval long hole (311) communicating with the inner cavity of the bolt sliding box (32) is penetrated through the steel plate (31), and the length direction of the oval long hole (311) is parallel to the distribution direction of the adjustable embedded part; the bolt (33) is arranged vertically and includes a bolt head (331) and a screw rod (332). The bolt head (331) is located inside the bolt sliding box (32), and the screw rod (332) passes through the oval long hole (311) and penetrates into the reserved channel (111). Corresponding to each of the reserved channels (111), square grooves (112) are respectively formed on the inner side surface of the precast guardrail (1), and the square grooves (112) communicate with the top of the reserved channels (111). The end of the screw rod (332) extends into the inner cavity of the square groove (112), and the screw rod (332) is fixed by a steel gasket (333) sleeved on its end and a nut (334); the area of the steel gasket (333) is larger than the cross-sectional area of the reserved channel (111), and a plurality of grouting holes communicating with the reserved channel (111) are penetrated through the steel gasket (333). By injecting cement slurry into the reserved channel (111) along the grouting holes and pouring non-shrinkage fine aggregate concrete into the square groove (112), the precast guardrail (1) and the precast bridge deck (2) are connected into a whole. A plurality of anchor bars (312) are arranged to extend downward from the bottom of the steel plate (31). The anchor bars (312) include a vertical part and a bent part, and the bent part faces the outside of the steel plate (31). A stop block (21) is protrudingly arranged on the upper surface of the precast bridge deck (2). The stop block (21) is parallel to the arrangement direction of the precast guardrail (1), and a matching stop block groove (12) is arranged along the length direction at the bottom of the outer side surface of the precast guardrail (1); an epoxy mortar layer I (41) is laid between the stop block (21) and the stop block groove (12). Shear keys (13) and shear key grooves (14) are respectively arranged on the opposite two side surfaces of the precast guardrail (1) along its length direction; two adjacent precast guardrails (1) are abutted, and the shear key (13) of one precast guardrail is inserted into the shear key groove (14) of the other precast guardrail; an epoxy mortar layer II (42) is laid between the shear key (13) and the shear key groove (14).

2. The prefabricated bridge guardrail according to claim 1, wherein: The reserved channel (111) is formed by the inner cavity of a pipe fitting embedded in the precast guardrail (1).

3. The prefabricated bridge guardrail according to claim 2, wherein: The pipe fitting is a PVC pipe.

4. The prefabricated bridge guardrail according to claim 1, wherein: The length of the oval long hole (311) is 8 cm.

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