A processing method for the joint sequence of comb-shaped expansion joints in bridge overlay

Abstract

The application discloses a processing method for a comb tooth type expansion joint jointing position in bridge overlay, and comprises the following steps: (S1) milling a milling jointing road section on the surface of a bridge deck pavement structure layer on both sides of the comb tooth type expansion joint, including a bonding material overlay area and an asphalt concrete overlay area; (S2) performing asphalt concrete overlay on the asphalt material overlay area and the bridge deck pavement structure layer to form a general overlay road section; (S3) finely cutting the interface between the asphalt concrete overlay area and the bonding material overlay area; (S4) adding bonding material in the bonding material overlay area, and the bonding material can be compacted by a field construction machine. The method uses newly developed bonding material to replace asphalt concrete material, solves the problems that the comb tooth type expansion joint jointing position is prone to edge biting and has poor durability when using asphalt concrete, avoids secondary excavation treatment of the bridge expansion joint, reduces the influence on traffic during construction, and has simple process and low cost.

Description

Technical Field

[0001] This invention belongs to the field of bridge pavement maintenance technology, and mainly relates to a method for treating the joint of a comb-shaped expansion joint in bridge overlay. Background Technology

[0002] Expansion joints are expansion devices between two bridge spans. During road overlay, the interface (joint) between the overlay layer (thin overlay) and the expansion device (steel fiber concrete) is prone to edge chipping and difficulty in compaction, which affects the road's functionality and is a technical challenge in road maintenance and overlay.

[0003] like Figure 1 As shown, a bridge pavement with added comb-shaped expansion joints generally includes a bridge deck pavement structure layer 1 and multiple comb-shaped expansion joints 2 spaced apart within the bridge deck pavement structure layer. Each comb-shaped expansion joint 2 includes a fixed comb-shaped steel plate and steel fiber reinforced concrete. Currently, steel fiber reinforced concrete is generally used to fill the gap (i.e., the joint) between the comb-shaped expansion joint and the bridge deck pavement structure layer. The filling width of the steel fiber reinforced concrete is generally 50-60cm. The stiffness difference between the asphalt concrete material on the surface of the bridge deck pavement structure layer (i.e., asphalt concrete) and the steel fiber reinforced concrete material at the expansion joint joint is significant, and the interfacial adhesion deteriorates over time. Edge chipping easily occurs between the asphalt concrete and the steel fiber reinforced concrete, failing to fundamentally solve the edge chipping and durability problems; it also affects the functionality of the pavement, such as smoothness and vehicle bounce issues.

[0004] Currently, in order to solve the problem of easy damage at the joint of expansion joints in engineering, there are three common treatment methods for the road surface overlay treatment at the expansion joint between the bridge deck pavement structure layer 1 and the comb-shaped expansion joint 2: direct overlay, milling and slope adjustment, and removal and repaving.

[0005] Patent CN 101929127 A discloses a method for preparing an overlay layer for bridge expansion joints. It discloses a reaction liquid (epoxy resin-urethane polymer copolymer) that can be directly used in the overlay layer. Utilizing the advantages of the reaction liquid, such as strong adhesion, good water resistance, large ultimate deformation capacity, and rapid solidification, it reduces edge chipping at the joint of the expansion joint. This direct overlay method is suitable for small expansion joints (such as modular expansion joints), but for large expansion joints (such as comb-type expansion joints), direct overlay can easily lead to material detachment and affect the expansion and contraction deformation of the expansion joint.

[0006] Patent CN 102839595 A introduces a kind of bridge head bumping processing method, in the patent, the steel fiber concrete structure of part expansion joint is chiseled, then, epoxy resin coating, steel mesh layout, the process of pouring concrete is carried out again.Thus, it reduces the large-scale demolition of the expansion joint in good service condition, and also avoids the secondary compaction and edge biting phenomenon at the expansion joint jointing place.But the invention needs to excavate the bridge expansion joint, the construction engineering quantity is large, the construction process is complex, the fine requirement is high when chiseling steel fiber concrete, and the cost is high. SUMMARY

[0007] The purpose of the present application is to provide a processing method for the jointing place of comb-tooth expansion joint in bridge overlay, which uses the developed bonding material to replace asphalt concrete material, solves the problem of edge biting phenomenon and durability of comb-tooth expansion joint jointing place using asphalt concrete, and avoids the secondary excavation and treatment of bridge expansion joint, reduces the impact on traffic during construction, and has simple process and low cost.

[0008] The above-mentioned purpose of the present application can be realized by the following technical scheme: a processing method for the jointing place of comb-tooth expansion joint in bridge overlay, comprising the following steps:

[0009] (S1) milling a milling jointing road section on the surface of the bridge deck pavement structure layer on both sides of the comb-tooth expansion joint, the milling jointing road section includes a bonding material overlay area and an asphalt concrete overlay area, the bonding material overlay area is adjacent to the comb-tooth expansion joint, and then the area after milling is cleaned and blown;

[0010] (S2) overlaying asphalt concrete on the asphalt concrete overlay area and the bridge deck pavement structure layer to form a general overlay section, and rolling to meet the design requirements after overlaying;

[0011] (S3) finely cutting the interface between the asphalt concrete overlay area and the bonding material overlay area, and blowing and cleaning the cutting area after cutting;

[0012] (S4) adding bonding material in the bonding material overlay area, which can be compacted by on-site construction machinery.

[0013] The method sets a milling jointing road section at the jointing place and develops a bonding material, improves the combination of rigid material and asphalt pavement material at the expansion joint, solves the problem of edge biting phenomenon and durability of comb-tooth expansion joint jointing place using asphalt concrete, quickly completes the overlaying process of the comb-tooth expansion joint, does not need to excavate and damage the expansion joint, and does not affect the normal use function of the comb-tooth expansion joint.

[0014] In the above-mentioned processing method for the jointing place of comb-tooth expansion joint in bridge overlay:

[0015] Preferably, in step (S1), a milling joint section is milled on each surface of the deck pavement structure layer on both sides of the comb-shaped expansion joint by using a fine milling process.

[0016] Preferably, in step (S1), the milling slope of the milling joint section is 0.05% to 0.3%.

[0017] More preferably, in step (S1), the milling slope of the milling joint section is 0.2%.

[0018] The milling slope refers to that, per 100 meters of horizontal distance towards the expansion joint, the vertical direction is lowered by 0.05 to 0.3 meters.

[0019] Preferably, in step (S1), the length of the milling joint section is 10 to 15 meters.

[0020] Preferably, in step (S1), the length of the bonding material paving area is 1 to 2 meters.

[0021] Preferably, in step (S2), the thickness of the general paving section (4) is 0.5 cm to 5 cm.

[0022] More preferably, in step (S2), the thickness of the general paving section (4) is 2 cm.

[0023] Preferably, in step (S2), the asphalt concrete paving is performed by using the engineering commonly used asphalt concrete, i.e., asphalt concrete.

[0024] Preferably, in step (S3), the interface between the asphalt concrete paving area (6) and the bonding material paving area (3) is finely cut, and the cutting boundary is perpendicular to the route.

[0025] Preferably, in step (S4), the bonding material is composed of an adhesive, a curing agent, a toughening agent, and a skeleton filler.

[0026] Preferably, in step (S4), the mass ratio of the adhesive, the curing agent, and the toughening agent is 20 to 50:5 to 20:20 to 70, and the mass ratio of the skeleton filler to the mixture of the adhesive, the curing agent, and the toughening agent is 1:0.5 to 2.

[0027] The bonding material in the present application has good bonding property and rigidity, and has the advantages of good stability, strong crack resistance, good fatigue resistance, and strong combination.

[0028] Preferably, the adhesive is epoxy resin and / or bisphenol A type epoxy resin; the curing agent is phenolic amine and / or polyamide; the toughening agent is one or more of rubber powder, asphalt, and styrene-butadiene-styrene polymer (SBS); and the skeleton filler is one or more of river sand, limestone, and fly ash.

[0029] The epoxy resin and / or bisphenol A type epoxy resin has the advantages of strong bonding force, good water resistance, large ultimate deformation capacity and fast solidification; the phenolic amine and / or polyamide has the advantages of good resistance and fast curing; the rubber powder, asphalt and styrene-butadiene-styrene polymer have the advantages of large tensile strength, high heat resistance and high toughness; and the river sand, limestone and fly ash can be used to increase the strength of the high bonding material.

[0030] Preferably, the particle size of the skeleton filler is 20-100 mesh.

[0031] The bonding material in the application has good bonding performance with rigid materials and asphalt concrete, and has high compressive strength and good fatigue resistance; it can well solve the current actual maintenance pavement engineering, especially the thin layer overlay of the comb tooth type expansion joint position, especially for the super bridge, the width of the comb tooth type expansion joint is 1-2 m, the direct overlay of the asphalt material affects the change function of the expansion joint, and the asphalt material is easy to fall off. Through the milling joint scheme in the application, the bonding material developed in the application is used in the transition area, which can well solve the poor bonding of the asphalt material and the steel fiber concrete in the comb tooth type expansion joint, and the edge biting problem. Based on the above, under the premise of using the milling joint processing technology, the 1-2 m bonding material overlay transition area is set, which well solves the flatness and bonding problems, solves the thin layer overlay processing elevation problem of the comb tooth type expansion joint, and has good practicability.

[0032] The application has the following advantages:

[0033] (1) The processing method of the application combines the bonding material with the milling joint process, improves the combination of the rigid material and the asphalt pavement material at the comb tooth type expansion joint in the bridge overlay, reduces the secondary excavation treatment of the bridge expansion joint, saves the cost, reduces the influence on the traffic during the construction, avoids the safety hazards caused by the secondary compaction, the jumping phenomenon at the expansion joint and the reduction of the driving comfort, etc.

[0034] (2) The processing method of the application is suitable for the treatment of the large expansion joint joint;

[0035] (3) The processing method of the application can quickly complete the overlay process of the road surface at the comb tooth type expansion joint;

[0036] (4) The processing method of the application uses the developed bonding material to replace the asphalt concrete material, which solves the biting edge phenomenon and durability problem of the asphalt concrete at the comb tooth type expansion joint;

[0037] (5) The processing method of the application does not affect the normal use function of the comb tooth type expansion joint;

[0038] (6) The treatment method of the present invention can solve the problem of the overlay elevation at large comb-shaped expansion joints when performing thin-layer overlay maintenance on some existing bridge pavements, avoid the need for large-scale milling of the surface layer of old asphalt pavement and replacement of expansion joints, save maintenance costs, and promote the maintenance concept of green highways. Attached Figure Description

[0039] Figure 1 The background technology refers to bridge pavement structures with added comb-tooth expansion joints;

[0040] Figure 2 The bridge pavement structure in Example 1 is an overlay of a comb-shaped expansion joint formed by milling the joint section and bonding material at the joint. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto. Unless otherwise specified, all raw materials used are from commercial sources.

[0042] Example 1

[0043] On a highway in Foshan City, further road surface maintenance is required. Some of the elevated bridges have comb-type expansion joints. To shorten construction time without affecting the normal function of the expansion joints, the main overlay treatment for these joints involves milling and smoothing. The specific steps are as follows:

[0044] Step 1: As Figure 2 As shown, a milling joint section 5 is milled on the surface of the bridge deck pavement structure layer 1 (old road area) on both sides of the comb-shaped expansion joint 2 using fine milling technology. The milling joint section 5 includes an adhesive material overlay area 3 and an asphalt concrete overlay area 6, wherein the adhesive material overlay area 3 is adjacent to the comb-shaped expansion joint 2.

[0045] The milling slope of section 5 of the connecting road is 0.2%.

[0046] The length of the milled joint section 5 is 10 meters.

[0047] The length of the bonding material overlay area 3 is 1 meter.

[0048] Step 2: After fine milling is completed, the milled asphalt concrete overlay area 6 and the bonding material overlay area 3 are cleaned and swept.

[0049] Step 3: Apply asphalt concrete overlay to the asphalt concrete overlay area 6 and the bridge deck pavement structure layer 1 to form a 2cm thick general overlay section 4. After the overlay is completed, compact it to meet the design requirements.

[0050] Fourth step: fine cutting is performed on the interface between the asphalt concrete paving area 6 and the bonding material paving area 3, the interface is perpendicular to the route after cutting, and the cutting area is cleaned after cutting;

[0051] Fifth step: the cutting area is cleaned after cutting;

[0052] Sixth step: pour the bonding material in the bonding material paving area 3, and compact it by the on-site construction machinery.

[0053] The proportion of the bonding material is shown in Table 1 below.

[0054] Table 1: Proportion of the bonding material used in Example 1

[0055] Adhesive Curing agent Toughener Framework filler Material Bisphenol a type epoxy resin Phenalkamine 100 mesh rubber powder 30 mesh river sand Proportion 20 9 21 50 .

[0056] Example 2

[0057] The difference between Example 1 and Example 2 is that the proportion of the bonding material is shown in Table 2 below.

[0058] Table 2: Proportion of the bonding material used in Example 2

[0059]

[0060] Example 3

[0061] The difference between Example 1 and Example 3 is that the slope is different, and the length of the bonding material paving area 3 is different.

[0062] The length of the milling joint route 5 is 15 meters, and the slope is 0.3%.

[0063] The length of the bonding material paving area 3 is 1.5 meters.

[0064] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any modification, equivalent replacement, and improvement within the technical range disclosed by the present application, which is made by any person skilled in the art within the spirit and principles of the present application, is covered by the protection scope of the present application.

Claims

1. A method for treating the joint of a comb-shaped expansion joint in bridge overlay, characterized in that: Includes the following steps: (S1) A section of milled joint (5) is milled on the surface of the bridge deck pavement structure layer (1) on both sides of the comb-shaped expansion joint (2). The milled joint (5) includes an area of ​​bonding material (3) and an area of ​​asphalt concrete (6). The area of ​​bonding material (3) is adjacent to the comb-shaped expansion joint (2). Then the milled area is cleaned and swept. (S2) Asphalt concrete overlay is carried out on the asphalt concrete overlay area (6) and the bridge deck pavement structure layer (1) to form a general overlay section (4). After the overlay is completed, it is compacted to meet the design requirements. (S3) The interface between the asphalt concrete overlay area (6) and the bonding material overlay area (3) is finely cut, and the cut area is blown clean after the cutting is completed; (S4) Add adhesive material to the area (3) where adhesive material is added, and compact it with on-site construction machinery; The adhesive material described in step (S4) is composed of an adhesive, a curing agent, a toughening agent, and a skeleton filler; The mass ratio of the adhesive, curing agent and toughening agent is 20-50:5-20:20-70, and the mass ratio of the skeleton filler to the mixture of the adhesive, curing agent and toughening agent is 1:0.5-2. The adhesive is epoxy resin and / or bisphenol A epoxy resin; the curing agent is phenolic amine and / or polyamide; the toughening agent is one or more of rubber powder, asphalt and styrene-butadiene-styrene polymer; the skeleton filler is one or more of river sand, limestone and fly ash; the particle size of the skeleton filler is 20 mesh to 100 mesh.

2. The method for treating the joint of the comb-shaped expansion joint in bridge overlay according to claim 1, characterized in that: In step (S1), a section of milled joint road segment (5) is milled on the surface of the bridge deck pavement structure layer (1) on both sides of the comb-shaped expansion joint (2) using fine milling technology.

3. The method for treating the joint of the comb-shaped expansion joint in bridge overlay according to claim 1, characterized in that: The milling slope of the milled connecting road section (5) in step (S1) is 0.05% to 0.3%.

4. The method for treating the joint of the comb-shaped expansion joint in bridge overlay according to claim 1, characterized in that: The length of the milled connecting section (5) mentioned in step (S1) is 10 to 15 meters.

5. The method for treating the joint of the comb-shaped expansion joint in bridge overlay according to claim 1, characterized in that: The length of the bonding material application area (3) in step (S1) is 1 to 2 meters.

6. The method for treating the joint of the comb-shaped expansion joint in bridge overlay according to claim 1, characterized in that: The thickness of the general overlay section (4) mentioned in step (S2) is 0.5cm to 5cm.

7. The method for treating the joint of the comb-shaped expansion joint in bridge overlay according to claim 1, characterized in that: In step (S3), the interface between the asphalt concrete overlay area (6) and the bonding material overlay area (3) is finely cut, and the boundary line after cutting is perpendicular to the route.

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