CN110887778A - Bridge deck expansion joint filling material fatigue life testing device and testing method - Google Patents

Abstract

The invention discloses a fatigue life testing device and a testing method of a bridge deck expansion joint filling material. A natural environment simulation device is arranged in a test box to provide natural environment factor conditions for the filling material between the test static part and the test dynamic part. , Fix the vibration fixed support plate on the side wall of the test box, and the test box is provided with a vibration support plate whose upper surface is flush with the surface of the vibration fixed support plate, forming a fixed load plane for the test static part and the test moving part, and the test static part is fixed. A simulated bridge deck connection structure is formed between the parts and the test moving parts, and the vibration device is used to drive the vibration pallet to move up and down relative to the vibrating fixed pallet to simulate the load condition of the bridge deck, which can accurately simulate the load condition of the bridge deck under the influence of natural environment factors. , and test and record the load conditions of the bridge deck, so as to realize the fatigue life performance test of the bridge deck expansion joint filler under the load and environment. The device has a simple structure and can perform fatigue life performance tests under different conditions.

Description

A kind of bridge deck expansion joint filler fatigue life testing device and testing method

technical field

The invention relates to the field of performance testing of bridge filling materials, in particular to a fatigue life testing device and testing method of bridge deck expansion joint filling materials.

Background technique

With the continuous development of bridge construction in my country, the number of bridges in China has already ranked first in the world. With the continuous development of bridge construction technology, each component of the bridge is required to have long life and high durability, so as to improve the comprehensive service life of the bridge. Among them, the expansion joint filler of bridges is one of the indispensable materials for the excellent maintenance performance of bridges. Due to the influence of vehicle load vibration, a single deck or component of a bridge will have a certain amplitude, which makes the expansion joint filler of the adjacent deck or the connection between the road and bridge in a state of shear stretching and shrinking for a long time. At the same time, under the combined action of natural environment factors such as water, light and heat, the expansion joint filler continues to age, resulting in the dilemma of low durability and frequent replacement of the expansion joint filler. One of the most important reasons for this situation is that the technicians did not make a comprehensive evaluation when selecting the caulking material. The fatigue life of caulking material under load and environment is often ignored in the selection process of caulking material, and technicians only pay attention to its performance in bonding and water resistance. At the same time, in the existing method, there is no testing device and method for the fatigue life performance of bridge deck expansion joint filler under load and environment, resulting in the lack of technical personnel to evaluate the performance in this respect.

Therefore, it is urgent to develop a fatigue life test device and test method for bridge deck expansion joint fillers to help technicians comprehensively evaluate the performance of bridge expansion joint fillers, and to provide an evaluation method for the selection of fillers.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fatigue life testing device and testing method for bridge deck expansion joint fillers, so as to overcome the deficiencies of the prior art.

To achieve the above object, the present invention adopts the following technical solutions:

A fatigue life testing device for bridge deck expansion joint filling material, comprising a test box, a vibration device, a natural environment simulation device, and a vibration fixing support plate fixed on a side wall in the test box, and the test box is provided with an upper surface and a vibration A vibrating support plate with a flush surface on the fixed support plate, one end face of the vibration support plate is in contact with one end face of the vibration fixed support plate, the vibration device can drive the vibration support plate to move up and down relative to the vibration fixed support plate, and the vibration fixed support plate and the vibration support plate The test static part and the test dynamic part are respectively fixed on the upper part, and the gap between the test static part and the test dynamic part is filled with caulking material. The natural environment simulation device is set in the test box to fill the gap between the test static part and the test dynamic part. The material provides the conditions of natural environment factors.

Further, the vibration device includes a vibration motor fixed at the upper end of the test box and a spring member fixed at the bottom of the vibration support plate, the vibration motor is connected with a sample support through a transmission rod, and the sample support includes an upper baffle and a side baffle, and the upper The baffle and the side baffle are respectively in contact with the upper end face and the side face of the test moving part.

Further, the transmission rod is provided with a vibration counter for obtaining the number of vibrations.

Further, the upper end of the sample holder is provided with a transmission disc for connecting with the transmission rod.

Further, the side of the vibration fixing support plate is provided with a side plate for fixing the static test piece.

Further, the natural environment simulation device includes a heating pipe, an ultraviolet aging and a water spray port arranged in the test box, the heating pipe is used for heating in the test box, and the ultraviolet aging lamp and the water spray port are arranged at the connection between the test static part and the test dynamic part. the top of the caulk.

A method for testing the fatigue life of a bridge deck expansion joint filler, comprising the following steps:

1), respectively fix the test moving part and the test static part on the vibration fixed support plate and the vibration support plate, and then use the filler to fill the expansion joint between the test moving part and the test static part, and maintain and form;

2) Connect the sample holder to the transmission rod, and then fit the sample holder to the surface of the test moving part;

3), set the test conditions and parameters to start the vibration motor to carry out the vibration test, record the test conditions, parameters and the damage status of the filler on the expansion joint between the test moving part and the test static part.

Further, in step 1), the test moving part and the test static part are placed on the vibration fixed support plate and the vibration support plate respectively, and the samples on the vibration support plate and the vibration fixed support plate are respectively tested by the sample support and the side plate. For fixing, adjust the sample holder to be close to the sample on the vibrating pallet, and then use the clamp bar to fix the sample holder and the side plate on the vibrating fixing pallet to prevent vertical deformation.

Further, a slot is formed at the joint of the test moving part and the test static part to form an expansion joint.

Compared with the prior art, the present invention has the following beneficial technical effects:

The present invention is a fatigue life testing device for bridge deck expansion joint filling material. By setting a natural environment simulation device in the test box, the natural environment factor conditions are provided for the filling material between the test static part and the test dynamic part. The side wall of the test box is fixed with a vibration fixed support plate, and the test box is provided with a vibration support plate whose upper surface is flush with the surface of the vibration fixed support plate. Fix the load plane with the test moving part, fill the gap between the test static part and the test moving part to form a simulated bridge deck connection structure, and use the vibration device to drive the vibration pallet to move up and down relative to the vibrating fixed pallet to simulate the load condition of the bridge deck , The device can accurately simulate the load condition of the bridge deck under the influence of natural environment factors, and record the load condition of the bridge deck, so as to realize the fatigue life performance of the bridge deck expansion joint filler under the load and the environment. In the test, the device has a simple structure and controllable natural condition factor parameters, which can perform fatigue life performance tests under different conditions, and the test results are accurate.

Further, the vibration device includes a vibration motor fixed at the upper end of the test box and a spring member fixed at the bottom of the vibration support plate, the vibration motor is connected with a sample support through a transmission rod, and the sample support includes an upper baffle and a side baffle, and the upper The baffle and the side baffle are respectively in contact with the upper end face and side of the test moving part, and the spring component is used as the natural rebound structure at the bottom of the vibration pallet, which can accurately simulate the rebound curve of the real bridge deck after being loaded, and the test results are highly accurate. .

Further, the transmission rod is provided with a vibration counter for acquiring the number of vibrations, so that the measurement result parameters can be accurately obtained.

Further, the upper end of the sample support is provided with a transmission plate for connecting with the transmission rod, so as to ensure the stable force of the sample support.

Further, the side of the vibration fixing support plate is provided with a side plate for fixing the test static piece, so as to prevent the test static piece from sliding sideways during the test and ensure the accuracy of the test result.

Further, the natural environment simulation device includes a heating pipe, an ultraviolet aging and a water spray port arranged in the test box, the heating pipe is used for heating in the test box, and the ultraviolet aging lamp and the water spray port are arranged at the connection between the test static part and the test dynamic part. The upper end of the caulking material, the natural environment conditions are controllable, and the results are accurate.

The invention provides a method for testing the fatigue life of a bridge deck expansion joint filling material. The test moving part and the test static part are respectively fixed on the vibration fixed support plate and the vibration support plate, and then the test moving part and the test static part are tested by using the seam filling material. The expansion joints between the parts are filled and maintained and formed; to ensure that the test structural parts are consistent with the real bridge deck road conditions to ensure the accuracy of the results, the sample bracket and the transmission rod are fixedly connected, and then the surface of the sample bracket and the test moving part is pasted Set the test conditions and parameters to start the vibration motor to conduct the vibration test, record the test conditions, parameters and the damage status of the filler on the expansion joint between the test moving part and the test static part, comprehensively consider the load, heat, light, water The effect of factor coupling on the fatigue life of joint filler can realize the fatigue life test of joint compound under the action of multi-factor coupling, and can comprehensively evaluate the durability of joint compound.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a top view of the structure of the present invention.

Figure 3 shows the state diagram of the bridge deck under no load.

Figure 4 is a state diagram when wheel loads act on the bridge deck.

Figure 5 is a schematic diagram of the load law generated by the vehicle load on the bridge deck.

Among them, 1. Test box body; 2. Test static parts; 3. Filling material; 4. Test moving parts; 5. Spring parts; 6. Vibration fixed pallet; 7. Sample support; , transmission rod; 10, vibration counter; 11, vibration motor; 12, UV aging lamp; 13, water spout; 14, flow meter; 15, control system; 16, clamp rod; 17, baffle plate; 18, expansion joint ; 19. Drive plate; 20. Vibration pallet.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Figures 1 and 2, a fatigue life testing device for bridge deck expansion joint fillers includes a test box 1, a vibration device, a natural environment simulation device, and a vibration fixing device fixed to the side wall of the test box 1 The support plate 6, the test box 1 is provided with a vibration support plate 20 whose upper surface is flush with the upper surface of the vibration fixed support plate 6, and one end face of the vibration support plate 20 is in contact with one end face of the vibration fixed support plate 6, and the vibration device can drive The vibration support plate 20 moves up and down relative to the vibration fixed support plate 6, and the vibration fixed support plate 6 and the vibration support plate 20 are respectively fixed with the test static piece 2 and the test dynamic piece 4, and the test static piece 2 and the test dynamic piece 4 are filled by filling. The seam material 3 is filled to form a bridge deck connection model; the natural environment simulation device is installed in the test box 1 to provide natural environment factor conditions for the seam filling material 3 between the test static part 2 and the test dynamic part 4 .

Specifically, the vibration device includes a vibration motor 11 fixed at the upper end of the test box and a spring member 5 fixed at the bottom of the vibration support plate 20. The vibration motor 11 is connected with a sample support 7 through a transmission rod 9, and the sample support 7 includes an upper block The plate and the side baffle 17, the upper baffle and the side baffle 17 are respectively in contact with the upper end face and the side surface of the test moving part 4 to ensure the stability of the lateral movement during the vibration process of the test moving part 4; the transmission rod 9 is provided with a vibration counter 10, used to obtain the number of vibrations; a side plate for fixing the static test piece 2 is provided on the side of the vibration fixing support plate 6 .

The upper end of the sample holder 7 is provided with a transmission disc 19 for connecting with the transmission rod 9 .

The natural environment simulation device includes a heating pipe 8, an ultraviolet aging lamp 12 and a water spray port 13 arranged in the test box 1. The heating pipe 8 is used for heating inside the test box, and the ultraviolet aging lamp 12 and the water spray port 13 are arranged in the test static state. The upper end of the joint filler 3 at the connection between the test piece 2 and the test movable piece 4.

The test box 1 provides a simulated environment for closed testing. The vibration fixing support plate 6 is fixed on the side wall of the box body 1 to place the test static piece 2. The vibration support plate 20 is fixed to the bottom of the test box 1 through the spring member 5. to place the test moving part 4; the test moving part 4 and the test static part 2 are respectively placed on the vibration support plate 20 and the vibration fixed support plate 6, and the sample support 7 is placed on the test moving part 4; the transmission rod 9 transmits the vibration load to the drive plate 19. The vibration motor 11 and the transmission rod 9 cause the test moving part 4 to produce sinusoidal deformation, simulating the continuous shearing and stretching-shrinking cycle of the caulking material under the action of the vehicle load. The side wall of the test box 1 is provided with a heating tube to control the temperature of the box, and the top is provided with an ultraviolet aging lamp 12 and a water spray port 13 , and the water spray port 13 is connected with the flow meter 14 . A control system 15 is provided outside the test box 1 , and the control system 15 is used to control the natural environment simulation device in the box 1 and set experimental conditions.

An expansion joint 18 is formed between the test moving part 4 and the test static part 2 .

Two baffles 17 are provided at both ends, which can reduce the material outflow when the joint filler 3 is poured. The sample holder 7 is provided with two clamp bars 16 on both sides of the expansion joint 18 to ensure that the joint filler 3 does not deform in the vertical direction before the strength is formed.

The vibration motor 11 has an amplitude of 1.0-1.2 cm and a frequency of 40 Hz; the vibration motor 11 is connected to the drive plate 19 on the test moving part 4 through the drive rod 9 .

The vibration counter 10 is connected with the transmission rod 11 and is used to record the number of times the vibration load of the vibration motor 9 acts.

The ultraviolet aging lamp 12 is used to simulate the ultraviolet rays generated by the sun. The heating wire 8 is used to control the temperature of the box. In the water spray port 13, the water spray amount of the water spray port 13 is controlled by the flow meter 14 to simulate the effect of moisture.

The control system 15 includes a motor switch, a UV aging lamp switch, a temperature switch, and a water spray switch. At the same time, parameters such as temperature, water spraying time, and vibration time can be set. By controlling different switches, the simulation of the fatigue life of the bridge deck expansion joint filler under the coupling action of different conditions of load, light, heat and water can be achieved.

According to the specific test process of the above-mentioned bridge deck expansion joint filler fatigue life test device, the bridge deck expansion joint is subjected to vehicle load as shown in Figure 3-5:

1), prepare two cement concrete samples of 40cm*20cm*5cm, test after curing to 7 days, vibrate the two concrete samples respectively on the fixed support plate 6 and the vibration support plate 20, then pass the sample support 7 and The side plates respectively fix the samples on the vibration support plate 20 and the vibration fixed support plate 6, adjust the sample support 7 to be close to the sample around the vibration support plate 20, and then use the clamp bar 16 to connect the sample support 7 to the sample support plate 7. The side plate on the vibrating fixed pallet 6 is fixed to prevent vertical deformation; a slot is formed at the joint of the two concrete samples to form an expansion joint 18, the slot width is 2cm, and the slot depth is 2.5cm, that is, the two specimens are each slotted 1cm, 2.5cm deep;

2), caulk the expansion joint 18 with the melted caulk 3, and test for 3 days of curing and molding;

3), place the sample support 7 on the vibration fixed support plate 6, loosen and take off the clamp rod 16, connect the transmission rod 9 with the drive plate 19 on the sample support 7 and fix it;

4), test conditions and parameters are set in the control system 15 according to the test requirements, the vibration motor 11 simulates the load, the ultraviolet aging lamp 12 simulates ultraviolet light, the heating pipe 8 is used to control the temperature, and the water spout 13 simulates the effect of moisture;

5) During the test, when the joint filler 3 is damaged or the number of test vibrations reaches 1 × 10 ⁷ (the cumulative standard axle load times of highway heavy-duty traffic is more than 1 million times), read the vibration on the vibration counter 10 The fatigue life of the joint material can be evaluated by frequency or observation of the failure state of the joint material.

Claims (9)

1. A fatigue life testing device for bridge deck expansion joint filling materials is characterized by comprising a testing box (1), a vibrating device, a natural environment simulation device and a vibrating fixed supporting plate (6) fixed on the side wall in the testing box body (1), wherein a vibrating supporting plate (20) with the upper surface flush with the upper surface of the vibrating fixed supporting plate (6) is arranged in the testing box body (1), one end face of the vibrating supporting plate (20) is in end face contact with one end face of the vibrating fixed supporting plate (6), the vibrating device can drive the vibrating supporting plate (20) to move up and down relative to the vibrating fixed supporting plate (6), a testing static part (2) and a testing movable part (4) are respectively fixed on the vibrating fixed supporting plate (6) and the vibrating supporting plate (20), the testing static part (2) and the testing movable part (4) are filled with the filling materials (3), the natural environment simulation device is arranged in the testing box body (1), the joint compound (3) between the static testing part (2) and the movable testing part (4) is provided with natural environment factor conditions.

2. The bridge deck expansion joint filling material fatigue life testing device of claim 1, wherein the vibration device comprises a vibration motor (11) fixed at the upper end in the testing box body and a spring component (5) fixed at the bottom of the vibration supporting plate (20), the vibration motor (11) is connected with a sample support (7) through a transmission rod (9), the sample support (7) comprises an upper baffle and a side baffle (17), and the upper baffle and the side baffle (17) are respectively contacted with the upper end face and the side face of the testing movable piece (4).

3. The fatigue life testing device for the joint compound of the bridge deck expansion joint as claimed in claim 2, wherein the driving rod (9) is provided with a vibration counter (10) for acquiring the vibration times.

4. The fatigue life testing device for the joint compound of the bridge deck expansion joint as claimed in claim 2, wherein the upper end of the sample bracket (7) is provided with a driving disc (19) for connecting with the driving rod (9).

5. The fatigue life testing device for the joint filling material of the bridge deck expansion joint as claimed in claim 1, wherein the side surface of the vibration fixing supporting plate (6) is provided with a side plate for fixing the testing static member (2).

6. The bridge deck expansion joint filling material fatigue life testing device of claim 1, characterized in that, the natural environment simulation device comprises a heating pipe (8), an ultraviolet aging lamp (12) and a water spray nozzle (13) which are arranged in the testing box body (1), the heating pipe (8) is used for heating in the testing box body, the ultraviolet aging lamp (12) and the water spray nozzle (13) are arranged at the upper end of the filling material (3) at the joint of the testing static part (2) and the testing movable part (4).

7. A fatigue life test method for bridge deck expansion joint filling materials based on the test device of claim 2 is characterized by comprising the following steps:

1) respectively fixing a testing movable piece (4) and a testing static piece (2) on a vibration fixing supporting plate (6) and a vibration supporting plate (20), then filling joints (18) between the testing movable piece (4) and the testing static piece (2) by using a joint filling material (3), and maintaining and forming;

2) fixedly connecting the sample bracket (7) with the transmission rod (9), and then attaching the sample bracket (7) to the surface of the test moving piece (4);

3) and setting test conditions and parameters, starting the vibration motor to carry out a vibration experiment, and recording the test conditions and parameters and the damage condition of the joint filling material on the expansion joint (18) between the test movable piece (4) and the test static piece (2).

8. The bridge deck expansion joint filling material fatigue life testing method according to claim 7, characterized in that in step 1), the testing movable part (4) and the testing stationary part (2) are respectively placed on the vibration fixing supporting plate (6) and the vibration supporting plate (20), samples on the vibration supporting plate (20) and the vibration fixing supporting plate (6) are respectively fixed through the sample support (7) and the side plates, the sample support (7) is adjusted to be attached to the periphery of the sample of the vibration supporting plate (20), and then the sample support (7) is fixed with the side plates on the vibration fixing supporting plate (6) through the clamping rods (16) to prevent vertical deformation.

9. The fatigue life test method of bridge deck expansion joint filling material according to claim 8, characterized in that the expansion joint (18) is formed by slotting the joint of the test movable member (4) and the test stationary member (2).

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