Blasting demolition device for quickly replacing highway bridge expansion device

Abstract

The utility model discloses a blasting demolition device for quickly replacing a highway bridge expansion device, which comprises two rows of energy-gathering follow-up devices distributed on a replacement interface at equal intervals. The energy-gathering follow-up device comprises a plurality of energy-gathering follow-up units, each energy-gathering follow-up unit comprises a cylindrical shell, a first shaped charge liner, a connecting body, a second shaped charge liner and fuses are sequentially installed in each cylindrical shell from bottom to top, all the fuses are connected through a detonating network, a front-stage charge is installed in each first shaped charge liner, and a rear-stage charge is installed in each second shaped charge liner. A rear-stage charge is installed in the second shaped charge cover, and a safety protection device is arranged outside the energy-gathering follow-up device. According to the blasting demolition device for quickly replacing the highway bridge expansion device, drilling is not needed, the construction time is saved, and the integrity of structures such as a main beam and a back wall can be effectively protected.

Description

Technical Field

[0001] The utility model relates to a blasting demolition device for quickly replacing a telescopic device of a highway bridge, belonging to the field of blasting. Background Art

[0002] In recent decades, with the large-scale development of highway bridge construction in my country, expansion joints have been widely used to meet the needs of longitudinal, transverse, vertical displacement and rotation of bridges caused by temperature changes, hurricanes, vehicle loads, earthquakes and other conditions. As a structural protection product that bears the largest dynamic load in highway bridges, expansion joints not only bear dynamic loads or impacts of varying magnitudes and complexity, but also have to withstand fatigue, wear, and various chemical and physical corrosion. Most of the expansion joints in bridges in my country have been damaged to a considerable extent, and a large proportion of them are in urgent need of maintenance or even replacement, which leads to the need to completely dismantle the expansion joints in service on the bridge and replace them with new ones. The conventional solution for dismantling the expansion joints in service on highway bridges usually uses mechanical methods to remove the anchored reinforced concrete on both sides of the expansion joints. Since mechanical construction is time-consuming and inefficient, it seriously affects the traffic efficiency of highway bridges and even causes traffic safety accidents. Utility Model Content

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a blasting demolition device for quickly replacing the expansion device of a highway bridge, which does not require drilling, saves construction time, and can effectively protect the integrity of structures such as the main beam and back wall.

[0004] Technical solution: To solve the above technical problems, the utility model provides a blasting demolition device for rapid replacement of a telescopic device of a highway bridge, comprising two rows of energy-gathering following devices distributed on the replacement interface, and the energy-gathering following devices are distributed on the replacement interface at equal intervals; the energy-gathering following device comprises a plurality of energy-gathering following units, and the energy-gathering following unit comprises a cylindrical shell, in which a first charge cap, a connector, a second charge cap and a fuse are sequentially installed from bottom to top, and all fuses are connected through a detonation network, a front-stage charge is installed in the first charge cap, a rear-stage charge is installed in the second charge cap, and a safety protection device is arranged outside the energy-gathering following device.

[0005] Preferably, the distance between adjacent energy-gathering follow-up units is 20-30 cm.

[0006] Preferably, the safety protection device includes several explosion-proof units, one end of which is provided with a plug, and the other end is provided with a groove opening upward, and adjacent explosion-proof units are connected into a whole by inserting the plug into the groove; the explosion-proof unit includes a shell, the outer side of the shell is wrapped with flame-retardant and sound-absorbing cotton, a number of connecting columns are installed inside the shell, a number of movable plates are installed on the connecting columns, and a rotatable screw is also installed inside the shell, the movable plate passes through the screw through a thread, and a number of springs are provided on the top of each movable plate; the cutting device is set on the exposed bridge deck, and the several explosion-proof units are covered on the upper part of the cutting device. When noise and vibration pollution are generated during cutting, the movable plate is driven to move along the screw, and the compression effect of the spring absorbs energy, and the flame-retardant and sound-absorbing cotton further absorbs sound, thereby greatly reducing the noise and the hazards of flying stones.

[0007] Preferably, the side of the shell is also provided with retractable flame-retardant and sound-absorbing cotton.

[0008] Preferably, the tail of the screw is provided with a step, a bearing is sleeved on the step, and the bearing is fixed to the housing through a bearing end cover, thereby fixing the screw to the housing.

[0009] Preferably, a truncated cone hole is provided on the movable plate, and the lower opening of the truncated cone hole is larger.

[0010] Preferably, a handle is provided on the top of the shell.

[0011] Beneficial effects: The utility model is used for the blasting and demolition device for rapid replacement of the expansion device of a highway bridge. The front-stage shaped charge is first detonated to form a high-speed, high-temperature, high-pressure metal jet at the bottom. The jet penetrates the reinforced concrete to form a hole of a certain depth and a certain aperture. While the metal shaped jet penetrates the reinforced concrete, the rear-stage shaped charge and the fuse device enter the hole together with the jet, and then the rear-stage shaped charge is detonated in the hole to form a crack in the horizontal direction. In actual on-site use, the shaped follow-up devices are placed in two rows at a certain distance on both sides of the expansion joint direction. Adjacent shaped follow-up devices interact with each other after detonation, so that the blasted medium can be destroyed more evenly and a crack is formed at the bottom, which can effectively protect the integrity of structures such as the main beam and the back wall. No drilling is required during construction, thus saving construction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a distribution diagram of the energy-gathering and following device of the present invention.

[0013] Figure 2 It is a structural schematic diagram of the energy-gathering follow-up unit.

[0014] Figure 3 It is a structural diagram of the safety protection device.

[0015] Figure 4 for Figure 3 Schematic cross-sectional view of . DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] like Figures 1 to 4 As shown, the utility model is a blasting demolition device for rapid replacement of a telescopic device of a highway bridge, comprising two rows of energy-gathering follow-up devices distributed on the replacement interface, the energy-gathering follow-up devices are distributed on the replacement interface at equal intervals, and the adjacent distance between the energy-gathering follow-up units is 20-30 cm; the energy-gathering follow-up device comprises a plurality of energy-gathering follow-up units, the energy-gathering follow-up unit comprises a cylindrical shell 12, in which a first charge cap, a connector 15, a second charge cap 13 and a fuse 11 are sequentially installed from bottom to top, all fuses 11 are connected through a detonation network, a front-stage charge 14 is installed in the first charge cap, a rear-stage charge 16 is installed in the second charge cap 13, and a safety protection device is arranged outside the energy-gathering follow-up device.

[0018] In the utility model, the safety protection device includes a plurality of explosion-proof units, one end of which is provided with a plug, and the other end is provided with a groove 1 opening upward, and adjacent explosion-proof units are inserted into the groove through the plug so that the plurality of explosion-proof units are connected into a whole; the explosion-proof unit includes a shell 3, and the shell 3 is wrapped with flame-retardant and sound-absorbing cotton 4, and a plurality of connecting columns 9 are installed inside the shell 3, and a plurality of movable plates 7 are installed on the connecting columns 9, and the movable plates 7 are provided with a plurality of inverted cone holes for reducing drag, and a rotatable screw is also provided inside the shell 3, and the movable plates 7 pass through the screw through threads, and a plurality of springs 8 are provided at the top of each movable plate 7; the cutting device is set on the exposed bridge deck, and a plurality of explosion-proof units are covered on the upper part of the cutting device, and when noise and vibration pollution are generated during cutting, the movable plates 7 are driven to move along the screw, and the compression effect of the spring 8 absorbs energy, and the flame-retardant and sound-absorbing cotton 4 further absorbs sound, thereby greatly reducing the noise and the hazards of flying stones.

[0019] In the utility model, the side of the housing 3 is also provided with a retractable flame retardant sound-absorbing cotton 4. The tail of the screw is provided with a step, and a bearing is sleeved on the step. The bearing is fixed to the housing 3 through a bearing end cover 5, thereby fixing the screw to the housing 3. The movable plate 7 is provided with a truncated cone hole, and the lower opening of the truncated cone hole is large. The top of the housing 3 is provided with a handle 2.

[0020] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A blasting demolition device for rapid replacement of a telescopic device of a highway bridge, characterized in that: The invention comprises two rows of energy-gathering follow-up devices distributed on the replacement interface, and the energy-gathering follow-up devices are distributed on the replacement interface at equal intervals; the energy-gathering follow-up device comprises a plurality of energy-gathering follow-up units, and the energy-gathering follow-up units comprise a cylindrical shell, and a first charge cap, a connector, a second charge cap and a fuze are sequentially installed in the cylindrical shell from bottom to top, and all the fuzes are connected through an initiation network, a front-stage charge is installed in the first charge cap, a rear-stage charge is installed in the second charge cap, and a safety protection device is arranged outside the energy-gathering follow-up device; the safety protection device comprises Several explosion-proof units are provided, one end of each explosion-proof unit is provided with a plug, and the other end is provided with a groove opening upward, and adjacent explosion-proof units are connected into a whole by inserting the plug into the groove; the explosion-proof unit comprises a shell, the outer surface of the shell is wrapped with flame-retardant and sound-absorbing cotton, several connecting columns are installed inside the shell, several movable plates are installed on the connecting columns, and there is also a rotatable screw inside the shell, the movable plate passes through the screw through a thread, and several springs are provided at the top of each movable plate; the side of the shell is also provided with retractable flame-retardant and sound-absorbing cotton.

2. The blasting demolition device for rapid replacement of expansion and contraction devices of highway bridges according to claim 1 is characterized in that: The distance between adjacent energy-gathering follow-up units is 20-30 cm.

3. The blasting demolition device for rapid replacement of expansion and contraction devices of highway bridges according to claim 1, characterized in that: The tail of the screw is provided with a step, on which a bearing is sleeved, and the bearing is fixed to the housing through a bearing end cover, thereby fixing the screw to the housing. The movable plate is provided with a truncated cone hole, and the lower opening of the truncated cone hole is large.

4. The blasting demolition device for rapid replacement of expansion and contraction devices of highway bridges according to claim 1, characterized in that: A handle is provided on the top of the shell.

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