CN211285312U - Reinforcing structure for lifting bridge deck cantilever plate - Google Patents

Reinforcing structure for lifting bridge deck cantilever plate Download PDF

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Publication number
CN211285312U
CN211285312U CN201921918137.XU CN201921918137U CN211285312U CN 211285312 U CN211285312 U CN 211285312U CN 201921918137 U CN201921918137 U CN 201921918137U CN 211285312 U CN211285312 U CN 211285312U
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steel
bridge
plate
bridge floor
cantilever slab
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CN201921918137.XU
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李志勇
李应根
王松林
周立平
方梁正
陈孟冲
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Ningbo Communications Planning Institute Co ltd
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Ningbo Communications Planning Institute Co ltd
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Abstract

The utility model relates to a promote reinforced structure of bridge floor cantilever slab, bridge floor cantilever slab is including the root that is used for fixed bridge floor cantilever slab's of newly-built guardrail tip and bridge floor cantilever slab, its characterized in that: the reinforced structure includes the combined steel member that extends to the root of the bridge floor cantilever slab from the tip of the bridge floor cantilever slab, the combined steel member includes at least two horizontal combined steel members that are connected with bridge floor cantilever slab and newly-built guardrail and the vertical trompil steel sheet that connects each horizontal combined steel member, compare with prior art, the utility model has the advantages that this reinforced structure based on bridge floor cantilever slab that promotes bridge guardrail anticollision grade, when improving guardrail crashworthiness, the combined steel member still makes the bridge floor cantilever slab to be consolidated in order to improve the bending resistance bearing capacity of bridge floor cantilever slab; from the aspect of construction performance, the traffic is only partially or temporarily closed, the influence on the traffic is reduced, and the construction risk is reduced.

Description

Reinforcing structure for lifting bridge deck cantilever plate
Technical Field
The utility model relates to a bridge floor cantilever plate's reinforcement technical field especially relates to a reinforced structure of bridge floor cantilever plate based on promote bridge railing anticollision grade.
Background
With the rapid development of the economic society and the increase of the number, the load and the speed of vehicles, people put forward higher requirements on the anti-collision capacity of bridge guardrails. Meanwhile, the total number of bridges in China is huge, guardrail forms and anti-collision capacity are different, and part of guardrails cannot meet the current protection requirements, so that the operation safety of highways is influenced, and transformation and promotion are urgently needed. The anti-collision grade of the guardrail of the current situation of a part of bridges is low and the bearing capacity of the bridge deck cantilever plate is insufficient, and the safety protection capacity of the bridge needs to be greatly improved due to the reasons of crossing over roads, primary protection areas of railways or urban drinking water sources and the like, so that the bridge deck cantilever plate needs to be reinforced when the guardrail is transformed and improved to improve the bearing capacity of the bridge deck cantilever plate. The conventional method for improving the bearing capacity of the bridge deck cantilever slab, such as newly-built bridge deck chiseling, often has long construction time, great difficulty and higher manufacturing cost, or increases the height of the cantilever slab, can refer to the Chinese utility model 'a bridge large cantilever flange slab reinforced steel supporting structure' with the patent number 201721675829.7 (the grant publication number is CN207597282U), and discloses a bridge large cantilever flange slab reinforced steel supporting structure, which is supported on the outer sides of the lower edge and the web of the bridge cantilever, and comprises a base plate, a rib plate and wing plates, wherein the base plate has a special-shaped shape which is jointed with the lower edge of the cantilever and the outer side of the web, one side of the rib plate has a special-shaped edge shape which is jointed with the base plate, one side of the special-shaped edge rib plate is welded with the base plate, the other side of the rib plate is linear, one side of the linear edge rib plate is welded with an anchor bolt, and the, the rib plate is provided with a plurality of decorative holes. This big cantilever flange plate of bridge consolidates steel bearing structure can reduce the influence to former bridge structural style and atress situation at the bridge piece wide transformation in-process, though it can reduce the influence of existing bridge floor driving, obviously improve cantilever structure's rigidity and stress reserve simultaneously, nevertheless the work progress is located the cantilever lower edge with the operation whole journey, the degree of difficulty of construction is big and the quality is difficult to guarantee, and the potential safety hazard is great, therefore, take scientific and reasonable's bridge floor cantilever plate bearing capacity lift method at the guardrail transformation in-process, to in time resuming bridge normal operation, reduce the influence to people's trip, be the problem that needs to solve at present urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a reinforced structure of convenient construction, safe and reliable and promotion bridge floor cantilever plate that construction potential safety hazard is little is provided to above-mentioned prior art current situation.
For solving the technical problem, the utility model discloses the technical scheme who adopts does: this promote reinforced structure of bridge floor cantilever slab, the bridge floor cantilever slab is including the root that is used for fixed bridge floor cantilever slab's of newly-built guardrail tip and bridge floor cantilever slab, its characterized in that: the reinforced structure includes the combination steel member that extends to the root of bridge floor cantilever slab from the tip of bridge floor cantilever slab, the combination steel member is including being used for with bridge floor cantilever slab and newly-built two at least horizontal combination steel members that the guardrail is connected and the vertical trompil steel sheet of being connected each horizontal combination steel member, wherein, each horizontal combination steel member is followed the bridge floor cantilever slab's is to interval arrangement from the longitudinal bridge.
Further, each transverse combination steel member comprises a bottom steel plate and a transverse open-hole steel member, wherein the bottom steel plate is arranged along the transverse bridge direction from the end part of the bridge deck cantilever plate to the root part, and the transverse open-hole steel member is vertically connected to the center of the bottom steel plate.
In order to enhance the bearing capacity of the deck cantilever plate, preferably, the bottom steel plate continues to extend in the transverse bridge direction where the root of the deck cantilever plate is located, and the position of the extending cutoff point of the bottom steel plate needs to meet the following requirements: i.e. not less than the root of the deck cantilever plateWherein, in the formula fspDesigned tensile strength value of base steel plate, AspIs the cross-sectional area, τ, of the base steel platepDesigned value of bonding strength between the bottom steel plate and the concrete, bpThe total width of the bottom steel plate adhered within the width range of 1 m.
In order to realize that the bottom steel plate has the function of strengthening the bearing capacity of the bridge deck cantilever plate and simultaneously fixing the newly-built guardrail, preferably, the bottom steel plate has an initial part corresponding to the end part of the bridge deck cantilever plate, and a welding part for welding with a vertical main rib of the newly-built guardrail is reserved between the longitudinal perforated steel plate and the initial part.
Further, the distance d between the starting part of the bottom steel plate and the end part of the bridge deck cantilever plate is 5 mm.
Wherein, the selection of the transverse open pore steel member can be considered in combination with the thickness of the bridge deck concrete cast-in-situ layer, and preferably, the transverse open pore steel member can be selected from any one of the following: the steel plate with the transverse holes, the channel steel with the transverse holes, the I-shaped steel with the transverse holes and the angle steel with the transverse holes.
Compared with the prior art, the bridge deck cantilever plate reinforcing structure has the advantages that after the new guardrail is replaced, the anti-collision capacity of the guardrail is improved, and the combined steel member can reinforce the bridge deck cantilever plate to improve the bending resistance bearing capacity of the bridge deck cantilever plate; and from the constructability, only need partly or short time to seal the traffic, the short time is accomplished and is consolidated the process, has reduced the influence to the traffic, in addition, the work progress is gone on bridge floor cantilever plate entirely, has the convenient and little characteristics of construction potential safety hazard of construction.
Drawings
FIG. 1 is a schematic structural view of each transverse combination steel member fixed on the top of a bridge deck cantilever plate in embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of the connection between the midsole steel plate and the transverse perforated steel plate according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a steel plate with a longitudinal hole according to embodiment 1 of the present invention;
FIG. 4 is a top view of the composite steel member fixed on the top of the bridge deck cantilever plate in embodiment 1 of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4 (with the newly constructed barrier attached);
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4 (with the newly constructed barrier attached);
fig. 7 is a schematic structural view of the connection between the midsole steel plate and the transverse opening channel steel in embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example 1
As shown in FIGS. 1 to 6, the preferred embodiment of the present invention is shown. In this embodiment, reinforcing structure based on deck cantilever slab 1 who promotes bridge guardrail anticollision grade, wherein, deck cantilever slab 1 is including the tip 1a that is used for fixing deck cantilever slab 1 of newly-built guardrail 120 and the root 1b of deck cantilever slab 1, reinforcing structure includes the combination steel member that extends to the root 1b of deck cantilever slab 1 from the tip 1a of deck cantilever slab 1, this combination steel member is including being used for two at least horizontal combination steel members that are connected with deck cantilever slab 1 and newly-built guardrail 120 and the vertical trompil steel sheet 20 of being connected each horizontal combination steel member, wherein, each horizontal combination steel member is along the vertical bridge of deck cantilever slab 1 to interval arrangement. This reinforced structure based on bridge deck cantilever slab that promotes bridge railing anticollision grade sees from the structure atress, changes newly-built guardrail 120 back, when improving guardrail crashworthiness, and combination steel member can be consolidated bridge deck cantilever slab 1 in order to improve the bending resistance bearing capacity of bridge deck cantilever slab 1. Wherein, every horizontal combination steel member includes along the horizontal bridge of tip 1a to root 1b place of bridge floor cantilever slab 1 to the end steel plate 9 of setting up, vertically connect the horizontal trompil steel member at end steel plate 9 central point, and the horizontal trompil steel member of this embodiment is horizontal trompil steel plate 30.
And for reinforcing the deck cantilever plate 1, the bottomThe steel plate 9 continues to extend towards the transverse bridge direction at the root 1b of the bridge deck cantilever plate 1, and the position of the extension cut-off point of the bottom steel plate 9 needs to meet the following requirements: i.e. not less than the root 1b of the deck cantilever plate 1Wherein, in the formula fspDesigned tensile strength value of base steel plate, AspIs the cross-sectional area, τ, of the base steel platepDesigned value of the bonding strength between the steel plate and the concrete, bpThe total width of the bottom steel plate 9 is 1 m. The bottom steel plate 9 also has a starting portion corresponding to the end 1a of the deck cantilever plate 1, and a welding portion 93 for welding with the vertical main rib of the newly-built guardrail 120 is left between the longitudinally-perforated steel plate 20 and the starting portion 92. The distance d between the initial portion 92 of the bottom steel plate 9 and the end 1a of the deck cantilever plate 1 is 5 mm.
The reinforcing method by utilizing the reinforcing structure comprises the following steps:
a. checking and calculating the bearing capacity of the bridge deck cantilever plate 1 according to the lifting of the anti-collision grade of the newly-built guardrail 120, and further selectively reinforcing the bridge deck cantilever plate 1;
b. determining the bearing capacity lifting quantity value of the bridge deck cantilever plate 1, and further determining the specification types and the arrangement intervals of the middle sole plate 9, the transverse perforated steel plate 30 and the longitudinal perforated steel plate 20 in the combined steel member;
c. milling and chiseling an original asphalt pavement layer 4 and an original concrete pavement layer 5 within the reinforcing range of the bridge deck cantilever slab 1, and reserving transverse steel bars of the original concrete pavement layer;
d. b, determining an implantation position of a chemical anchor bolt 12, drilling, and fixing the bottom steel plate 9 with the determined specification type and arrangement interval and the transverse open pore steel member on the top surface of the bridge deck cantilever plate 1 by using the chemical anchor bolt 12 and a bonded steel structure; the chemical anchor bolts 12 in the step d are M12 chemical anchor bolts, the implantation depth of the chemical anchor bolts 12 is larger than or equal to 100mm, two groups of bottom steel plates 9 are arranged, two of each group are fixed through the chemical anchor bolts, each group of chemical anchor bolts is provided with two chemical anchor bolts, the chemical anchor bolts are respectively anchored near the welding parts 93 of the bottom steel plates and near the extending positions of the anchor bolts on the bottom steel plates 9, the thickness of the bottom steel plates 9 in the step d is 6-10 mm, the width of the bottom steel plates is 160-220 mm, the thickness of the transverse steel member with holes is 6-10 mm, and the vertical height of the transverse steel member with holes is 70-72 mm.
e. Welding the longitudinal perforated steel plate 20 with the determined specification and model in the step b, the bottom steel plate 9 in the step d and the transverse perforated steel member into an integral combined steel member; and the thickness of the longitudinal perforated steel plate 20 in the step e is 6-10 mm, and the height of the vertical height and the height of the transverse perforated steel member are 70-72 mm.
f. Paving a reinforcing mesh of the concrete pavement layer of the bridge deck cantilever slab 1, wherein the paving of the reinforcing mesh is realized on the basis of the combined steel member in the step e by means of at least two longitudinal reinforcing bars 70 for penetrating through reserved holes of the transversely-opened steel member and at least two transverse reinforcing bars 80 for penetrating through reserved holes of the longitudinally-opened steel plate 20;
g. a new bridge deck concrete cast-in-place layer 13 is poured on the basis of the step f, and the new bridge deck concrete cast-in-place layer and the bridge deck cantilever slab 1 form a section steel-concrete combined section;
h. welding the vertical main reinforcement of the newly-built guardrail 120 with the welding part 93 of the combined steel member in the step e;
i. after the new bridge deck concrete cast-in-place layer 13 in the step g is maintained to the design strength, binding the rest reinforcing steel bars of the newly-built guardrail 120, and pouring concrete of the newly-built guardrail 120;
j. paving an asphalt concrete pavement layer 14 within the reinforcing range of the bridge deck cantilever slab 1;
k. and normal traffic is recovered.
To sum up, based on the concrete construction method of the reinforced structure of bridge floor cantilever slab's of promoting bridge guardrail anticollision grade reinforced structure must confirm the bearing capacity lift quantity value of bridge floor cantilever slab 1 earlier, and then confirm the specification model of combination steel member, arrange interval and reinforcing bar, the requirement of chemical crab-bolt 12, and the calculation of bridge floor cantilever slab 1 bearing capacity: firstly, according to relevant regulations of highway traffic safety facility design rules (JTG/T D81) and action technical guidelines special for improving the safety protection capability of highway bridges (2019, 3 months), determining the anti-collision grade of the newly-built guardrail 120 of the old bridge, and checking whether the bearing capacity of the bridge deck cantilever plate meets the standard requirements after the anti-collision grade of the guardrail is improved.
Wherein the specification model of the combined steel member is as follows:
the bottom steel plate 9 of the combined steel member is preferably made of Q355 steel; and can adopt weathering resistant steel, carbon steel and low-alloy high-strength steel; the thickness of the bottom steel plate is preferably 6 mm-10 mm, the width is preferably 160 mm-220 mm, and the adhesive for adhering the bottom steel plate 9 is A-level steel-adhering structural adhesive; the thickness of the longitudinal perforated steel plate 20 is preferably 6 mm-10 mm, the width is the same as that of the transverse perforated steel plate 30, and the length of the longitudinal section is generally 5-9 m; selecting a bottom steel plate 9, a transverse perforated steel plate 30 and a longitudinal perforated steel plate 20, wherein the bottom steel plate 9 extends towards the inner side of the root of the bridge deck cantilever plate 1, and the distance between the position of a cut-off point and the root of the bridge deck cantilever plate is not less thanIn the formula fspDesigned tensile strength value of base steel plate, AspIs the cross-sectional area, τ, of the base steel platepDesigned value for bond strength between steel plate and concrete (available from JTG/T J22-2008 Table 6.2.5), bpThe total width of the bottom steel plate stuck within the width range of 1 m;
and then determining the arrangement distance of the transverse combined steel members: the longitudinal arrangement distance of the transverse combined steel members along the bridge deck cantilever plate 1 is preferably 500-1000 mm;
the requirements of the reinforcing bars used for the laying of the mesh reinforcement are then determined: ribbed steel bars are adopted, the grade of the steel bars is not lower than HRB400, and the diameter of the steel bars is 12 mm; the steel bars are welded, and the length of a welding seam meets the standard requirement; the newly added longitudinal steel bar 70 passes through the reserved hole of the transverse perforated steel plate 30; the newly added transverse steel bar 80 passes through the reserved hole of the longitudinal perforated steel plate 20;
and then determining the requirements of the chemical anchor bolt: adopting M12 chemical anchor bolt 12 and A-level bar planting glue; the implantation depth of the chemical anchor bolt is more than or equal to 100 mm; two groups of bottom steel plates 9 are arranged, and two chemical anchor bolts 12 are fixed on each group of two bottom steel plates, wherein two chemical anchor bolts 2 are arranged on each group and are respectively anchored near the welding part 93 of the bottom steel plates 9 and near the extending position of the bottom steel plates 9; when the chemical anchor bolt 12 is implanted, the position can be properly adjusted according to actual conditions by paying attention to avoiding the steel bars in the original beam plate 200.
And finally determining the requirements of a new bridge deck concrete cast-in-place layer: general conditions are as follows: adopting common C40 and above concrete; if the construction period is limited and the like, the conditions of quick construction requirements are as follows: novel concrete materials such as rapid hardening type ultra-high toughness concrete and the like can be adopted.
Referring to fig. 1, in the case of three combined steel members, for example, a first transverse combined steel member 100, a second transverse combined steel member 101 and a third transverse combined steel member 102, which are respectively described by being disposed at intervals of 800mm in the longitudinal direction of a deck cantilever 1, the first transverse combined steel member 100, the second transverse combined steel member 101 and the third transverse combined steel member 102 each have a bottom steel plate 9 and a transverse perforated steel plate 30, the bottom steel plates 9 and the transverse perforated steel plates 30 of the first transverse combined steel member 101, the second transverse combined steel member 102 and the third transverse combined steel member 103 are fixed to the top of the deck cantilever 1 by implanting chemical anchors 12 and attaching glues, the first transverse combined steel member 101, the second transverse combined steel member 102 and the third transverse combined steel member 103 are connected together by a longitudinal perforated steel plate 20, and then longitudinal reinforcing bars 70 for reserving holes through the transverse perforated steel plates 30 and a plurality of longitudinal perforated steel bars 70 for penetrating through the longitudinal perforated steel plates 30 are used to penetrate through the transverse perforated steel plates 30 Laying a reinforcing mesh by using transverse reinforcing steel bars 80 with reserved holes on the steel plates 20, and welding the newly-built guardrail 120 on the welding part 93 of each bottom steel plate 9, wherein, referring to fig. 5 and 6, the newly-built guardrail 120 comprises a first guardrail vertical main bar 1201 corresponding to the initial part 92 of each bottom steel plate 9, a second guardrail vertical main bar 1202 corresponding to the longitudinal perforated steel plate 20 and a third guardrail vertical main bar 1203 corresponding to the bottom steel plate 9, during welding, the first guardrail vertical main bar 1201 is directly welded on the welding part 93 of the bottom steel plate 9 or the transverse reinforcing steel bar 80 of the newly-built bridge deck, the transverse reinforcing steel bar 80 of the newly-built bridge deck is welded and fixed with the transverse reinforcing steel bar of the original concrete pavement layer, the second guardrail vertical main bar 1202 is directly welded on the longitudinal perforated steel plate 20, the cast-in-place third guardrail vertical main bar 1203 is directly welded on the bottom steel plate 9, and finally the bridge deck concrete layer 13 is poured to form a section steel-concrete composite section, the stress is applied together with the bridge deck cantilever slab 1, the bending rigidity of the bridge deck cantilever slab 1 is improved, and the purpose of improving the bearing capacity of the bridge deck cantilever slab 1 is achieved.
Example 2
The structure is basically the same as that of the embodiment 1, and the only difference is that: the transverse opening steel member is transverse opening channel steel 40, and the channel steel is preferably 6.3 type, 6.5 type, 8 type and 10 type, as shown in fig. 7.
Example 3
The structure is basically the same as that of the embodiment 1, and the only difference is that: the transverse perforated steel member is transverse perforated I-steel.
Example 4
The structure is basically the same as that of the embodiment 1, and the only difference is that: the transverse perforated steel member is transverse perforated angle steel.

Claims (6)

1. The utility model provides a reinforcing structure who promotes bridge floor cantilever slab, bridge floor cantilever slab is including tip (1a) that is used for fixed bridge floor cantilever slab (1) of newly-built guardrail (120) and root (1b) of bridge floor cantilever slab (1), its characterized in that: the reinforced structure includes the combination steel member that extends to root (1b) of bridge floor cantilever slab (1) from tip (1a) of bridge floor cantilever slab (1), the combination steel member is including being used for two at least horizontal combination steel members of being connected with bridge floor cantilever slab (1) and newly-built guardrail (120) and vertical trompil steel sheet (20) of being connected each horizontal combination steel member, wherein, each horizontal combination steel member is followed the longitudinal bridge of bridge floor cantilever slab (1) is to interval arrangement.
2. A reinforcing structure for a lifting deck cantilever plate according to claim 1, wherein: each transverse combination steel member comprises a bottom steel plate (9) arranged in the transverse bridge direction from the end part (1a) to the root part (1b) of the bridge deck cantilever plate (1) and a transverse open-hole steel member vertically connected to the center of the bottom steel plate (9).
3. A reinforcing structure for a lifting deck cantilever plate according to claim 2, wherein: the bottom steel plate (9) continues to extend towards the transverse bridge direction where the root (1b) of the bridge deck cantilever plate (1) is located, and the position of an extending cutoff point of the bottom steel plate (9) needs to meet the following requirements: namely, it isThe distance from the root (1b) of the bridge deck cantilever slab (1) is not less thanWherein, in the formula fspDesigned tensile strength value of base steel plate, AspIs the cross-sectional area, τ, of the base steel platepDesigned value of the bonding strength between the steel plate and the concrete, bpThe total width of the bottom steel plate (9) is adhered within the width range of 1 m.
4. A reinforcing structure for a lifting deck cantilever plate according to claim 3, wherein: the bottom steel plate (9) is provided with a starting part (92) corresponding to the end part (1a) of the bridge deck cantilever plate (1), and a welding part (93) used for welding with a vertical main rib of the newly-built guardrail (120) is reserved between the longitudinal perforated steel plate (20) and the starting part (92).
5. A reinforcing structure for a lifting deck cantilever plate according to claim 4, wherein: the distance d between the starting part (92) of the bottom steel plate (9) and the end part (1a) of the bridge deck cantilever plate (1) is 5 mm.
6. A reinforcing structure for a lifting bridge deck cantilever plate according to any one of claims 2 to 5, wherein: the transversely open-cell steel member may be selected from any one of: the steel plate (30) with the transverse holes, the channel steel (40) with the transverse holes, the I-shaped steel with the transverse holes and the angle steel with the transverse holes.
CN201921918137.XU 2019-11-07 2019-11-07 Reinforcing structure for lifting bridge deck cantilever plate Active CN211285312U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921918137.XU CN211285312U (en) 2019-11-07 2019-11-07 Reinforcing structure for lifting bridge deck cantilever plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921918137.XU CN211285312U (en) 2019-11-07 2019-11-07 Reinforcing structure for lifting bridge deck cantilever plate

Publications (1)

Publication Number Publication Date
CN211285312U true CN211285312U (en) 2020-08-18

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Application Number Title Priority Date Filing Date
CN201921918137.XU Active CN211285312U (en) 2019-11-07 2019-11-07 Reinforcing structure for lifting bridge deck cantilever plate

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CN (1) CN211285312U (en)

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