CN111794133B - Method for dismantling concrete guardrail on bridge - Google Patents

Abstract

The application discloses a method for dismantling a concrete guardrail on a bridge, which relates to the technical field of ramp dismantling construction, and comprises the following steps: dividing a concrete guardrail on a bridge into a plurality of guardrail units along the bridge direction, and marking the cutting sections of the guardrail units; and respectively cutting the guardrail units along the cutting section by using a diamond wire saw until all the guardrail units are cut. The method for dismantling the concrete guardrail on the bridge is high in construction efficiency, safe and easy to implement, and the reserved part of the bridge is not damaged when the concrete guardrail is dismantled.

Description

Method for dismantling concrete guardrail on bridge

Technical Field

The application relates to the technical field of ramp demolition construction, in particular to a method for demolishing a concrete guardrail on a bridge.

Background

The bridge guardrail is a barrier for preventing vehicles from being out of control to rush out of the bridge, and the bridge guardrail is mostly based on reinforced concrete, and old concrete guardrails can not meet new production and living needs gradually from the aspect of structural appearance or use function, so that the poured concrete guardrails need to be dismantled.

The traditional method for removing the concrete guardrail on the bridge comprises manual chiseling or mechanical crushing or static crushing or blasting removal, the conventional method for removing the existing structure is constructed by adopting devices such as crushing guns, hydraulic tongs and the like, but the methods are not low in efficiency or high in risk, and are serious in general noise and pollution, meanwhile, the structures needing to be reserved in the removing process of the methods can generate disturbance damage in different degrees, and the defects that the performance of the part of the structure needing to be reserved is easy to damage, construction noise is high, dust pollution is high and the like exist, or the reserved part of concrete generates cracks or is separated from the concrete, and the quality requirements of the original design are difficult to meet.

Disclosure of Invention

The embodiment of the application provides a method for dismantling a concrete guardrail on a bridge, the method is high in construction efficiency, safe and easy to implement, and the reserved part of the bridge is not damaged when the concrete guardrail is dismantled.

The embodiment of the application provides a method for dismantling a concrete guardrail on a bridge, which comprises the following steps:

dividing concrete guardrails on the bridge into a plurality of guardrail units along the bridge direction, and marking the cutting sections of the guardrail units;

and respectively cutting the guardrail units along the cutting section by using a diamond wire saw until all the guardrail units are cut.

In this embodiment, it is preferable that the cutting sections of the guardrail unit include at least one transverse section and at least one vertical section, and the diamond wire saw cuts the guardrail unit in the sequence of transverse cutting and vertical cutting.

Preferably, the concrete guardrail on the divided bridge is a plurality of guardrail units along the bridge direction, and the concrete steps of marking the cutting sections of the guardrail units are as follows:

dividing the concrete guardrail into a plurality of guardrail units along the bridge direction of the bridge;

and carrying out paying-off marking on the cutting section of each guardrail unit, wherein the cutting section comprises at least one transverse section and at least one vertical section.

Preferably, the diamond wire saw comprises a wire saw and a diamond wire, and the specific steps of using the diamond wire saw to respectively cut the guardrail units along the cutting section are as follows:

a rope threading hole for a diamond rope to pass through is formed in the cutting section of the guardrail unit;

winding the diamond rope on the rope sawing machine after the diamond rope passes through the rope threading hole and surrounds a cutting section for a circle;

driving the diamond wire to cut the guardrail unit according to a cutting direction by using the wire saw.

Preferably, the diamond wire is tensioned using the diamond wire saw.

Preferably, a plurality of diamond wire saws are used simultaneously to cut a plurality of guardrail units respectively.

Preferably, the method further comprises the step of:

and chiseling a groove on the marked cutting section on the guardrail unit.

Preferably, the method further comprises the step of:

hoisting holes are formed in the guardrail units in advance;

and when the guardrail unit is cut, hoisting the cut guardrail unit through the hoisting hole.

Preferably, the cut guardrail unit is hoisted through the hoisting hole using a hoist on a deck of the bridge.

Preferably, the method further comprises the step of:

and carrying out water cooling treatment on the part being cut by the diamond wire saw.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a method for dismantling a concrete guardrail on a bridge, cutting sections are marked on the concrete guardrail to be dismantled in a partitioning mode, a plurality of cutting sections are dismantled by a diamond wire saw, and during construction, noise is low and dust is little; meanwhile, the diamond rope linearly cuts the concrete guardrail to enable the cutting section to be tidy, and the reserved part on the bridge is prevented from being damaged. When dismantling concrete guardrail, all need not high altitude construction at the bridge floor operation, factor of safety is high, has still reduced intensity of labour, practices thrift a large amount of manpowers, material resources, effectively promotes the efficiency of construction.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a main flowchart of a method for removing a concrete guardrail on a bridge according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, the present application provides a method for removing a concrete guardrail on a bridge, which includes the following steps:

step S1: dividing a concrete guardrail on a bridge into a plurality of guardrail units along the bridge direction, and marking the cutting sections of the guardrail units;

step S2: and respectively cutting the guardrail units along the cutting section by using a diamond wire saw until all the guardrail units are cut.

When the method for dismantling the concrete guardrail on the bridge, provided by the embodiment of the application, is applied to concrete guardrail cutting, firstly, the concrete guardrail is divided into a plurality of guardrail units and cutting sections are marked, so that the difficulty of cutting the concrete guardrail by using a diamond wire saw is reduced, and the cutting efficiency and the cutting difficulty are improved; and then, linearly cutting each guardrail unit along the cutting section of the guardrail unit by using a diamond wire saw.

In the embodiment, the concrete guardrail is divided into a plurality of guardrail units, so that the decomposition and cutting difficulty is reduced, the construction efficiency is effectively improved, meanwhile, the dismantling process of the concrete guardrail on the bridge is implemented on the bridge floor, the noise is low, the dust is less, no high-altitude construction is realized, the safety performance is improved, further, after the diamond rope sawing machine is started, the guardrail units are automatically cut, the artificial interference is not needed, the labor cost is saved, the labor intensity is reduced, and the construction efficiency is effectively improved; meanwhile, the diamond rope linearly cuts the concrete guardrail to enable the cutting section to be tidy, and the reserved part on the bridge is prevented from being damaged.

In this embodiment, the cutting sections of the guardrail unit include at least one transverse section and at least one vertical section, and the diamond wire saw cuts the guardrail unit according to the sequence of transverse cutting and vertical cutting. Wherein, when a certain guardrail unit is in the middle of a plurality of guardrail units, this guardrail unit contains the horizontal section of a horizontal distribution and the vertical section of a vertical distribution, and the guardrail unit all roughly is the cuboid structure, therefore horizontal section is located the bottom surface of cuboid, and vertical section is located the roughly vertically side of this bottom surface of cuboid. According to the cutting sequence of horizontal cutting and vertical cutting, when the cut guardrail units are in the horizontal cutting, one ends of the cut guardrail units are connected with the guardrail units which are not cut, and certain connecting force is provided; and when the cut guardrail unit is vertically cut, because the vertical cutting distance is shorter, the lower end of the cut guardrail unit is separated from the bridge, and the vertical cutting of the cut guardrail unit is easily completed. Moreover, the cutting sequence can be conveniently operated by constructors, so that the construction efficiency is improved.

Specifically, the specific step of step S1 is:

dividing the concrete guardrail into a plurality of guardrail units along the bridge direction of the bridge;

and carrying out paying-off marking on the cutting section of each guardrail unit, wherein the cutting section comprises at least one transverse section and at least one vertical section.

In the embodiment, according to the field space condition and the characteristics of the cut members, the concrete guardrail is divided into a plurality of guardrail units, the guardrail units to be dismantled are determined in sequence, the position of the cutting section of each guardrail unit is determined, namely the concrete guardrail to be cut is designed and partitioned before the position of the cutting section is determined, the longitudinal length of each partition is not more than 6m, the cutting section position after the partition is paid off, and the longitudinal length direction is along the bridge following direction of the bridge. The longitudinal length of each guardrail unit is designed to fully consider the lifting capacity of the lifting equipment for lifting the guardrail units, so that the cut guardrail units can be lifted and dragged away by the lifting equipment, and the aim of improving the dismantling efficiency can be fulfilled.

Further, the diamond wire saw comprises a wire saw and a diamond wire, and the specific steps of using the diamond wire saw to respectively cut the guardrail units along the cutting section are as follows:

step S201: a rope threading hole for a diamond rope to pass through is formed in the cutting section of the guardrail unit;

step S202: winding the diamond rope on the rope sawing machine after the diamond rope passes through the rope threading hole and surrounds a cutting section for a circle;

step S203: driving the diamond wire to cut the guardrail unit according to a cutting direction by using the wire saw.

Further, the diamond wire is tensioned using the diamond wire saw.

Specifically, the rope saw comprises a drill floor, a flywheel set, a guide wheel and a rope saw driver, wherein a diamond rope rotates; before step S203, the drill floor is further required to be fixedly installed, a flywheel set is assembled on the drill floor, a rope saw driver and the flywheel set are connected, and two ends of the diamond rope are wound on the flywheel set, wherein the rope saw driver drives the flywheel set to rotate in the same direction as the rotation direction of the diamond rope on the flywheel set; and then, installing a guide wheel on the bridge deck of the bridge, wherein the guide wheel is positioned on the revolving path of the diamond rope.

When the rope saw driver is started, the rope saw machine can rotate orderly and drive the diamond rope to rotate, and at the moment, the diamond rope rubs with the concrete structure of the guardrail unit to be cut so as to achieve the purpose of cutting. Simultaneously, at the in-process of cutting, still need use flywheel set constantly tightens the diamond rope avoids the diamond rope not hard up and leads to cutting unusually.

The embodiment of the invention applies the diamond wire saw to the dismantling construction of the concrete crash barrier on the bridge, and the sound of reinforced concrete is mainly ground by the diamond wire in the cutting construction process; the rope saw driver is specifically an electric hydraulic motor, and the operation is stable, no harsh sound exists in the whole construction, the rope saw cutting is pollution-free, and compared with the existing dismantling of the concrete guardrail on the bridge, the rope saw driver has the advantages of high construction efficiency, low noise, no dust pollution, high safety coefficient and the like.

As a preferred scheme of the embodiment of the application, a plurality of diamond wire sawing machines are synchronously used for respectively cutting a plurality of guardrail units. When the construction period is short, a plurality of diamond wire saws are used for cutting different guardrail units respectively, and the construction period can be shortened by times.

Further, the method comprises the steps of:

and chiseling a groove on the marked cutting section on the guardrail unit. After the cutting sections are marked on the guardrail units, the diamond wire saw is used for respectively cutting the guardrail units along the cutting sections, and grooves are chiseled on the cutting sections, so that the cutting position deviation can be avoided, and the cutting linear quality is further guaranteed.

As another preferable solution of the embodiment of the present application, the method further includes the steps of:

hoisting holes are formed in the guardrail units in advance;

and when the guardrail unit is cut, hoisting the cut guardrail unit through the hoisting hole.

In this embodiment, set up the hole for hoist and set up the wire rope handling hole and can go on in same process, the hole for hoist can be located the upper portion of guardrail unit, and the wire rope handling hole can be located the guardrail unit and be close to the position of bottom, of course, the hole for hoist also is for running through the through-hole, and the hoist and mount in the guardrail unit later stage after the convenient cutting is for supplying centralized processing. Simultaneously, at the in-process of cutting, use the hole for hoist and mount to make the guardrail unit by the cutting pull by the foreign object, also can avoid appearing the guardrail unit and drop the condition under the bridge, improve the security that concrete guardrail demolishs at the bridge floor.

Specifically, a crane on the deck of the bridge is used to lift the cut guardrail unit through the lifting hole. And after the guardrail units are cut, hoisting the cut guardrail units to a transport vehicle by adopting a 25t truck crane, and transporting to a specified position for centralized treatment.

Preferably, the method further comprises the step of:

and carrying out water cooling treatment on the part being cut by the diamond wire saw.

In this embodiment, intake in the gap to diamond rope cutting concrete guardrail, adopt the high-speed moving diamond rope of water cooling, still can take away the iron fillings that grind off and the garrulous bits of concrete, the cold water has the effect of cooling down and avoiding the raise dust to cutting equipment itself promptly in the cutting process. Preferably, a closed system is adopted to control splashing of water, so that mud on a construction site is avoided, and inconvenience is caused to subsequent construction.

The present application is further described below with reference to a specific embodiment.

Taking the example of dismantling the concrete crash barrier of the old bridge of the reconstruction and extension project of a certain place, the current half-span bridge (called the old bridge for short) of the reconstruction and extension project of the large bridge has the total length of 1394.00m, the total length is divided into 6 joints, and the bridge type is arranged to be 12 multiplied by 10m +6 multiplied by 30m + (36+148+36) m +8 multiplied by 30m +7 multiplied by 30 m; the approach bridge adopts 10m prestressed concrete hollow slabs and 30m prestressed concrete continuous T-shaped beams; the main bridge adopts a (36+148+36) m steel pipe concrete tied arch bridge, and the clear width of the old bridge is 15.1 m. Experience of the construction of this diamond wire saw cutting concrete anticollision barrier in bridge reconstruction extension engineering shows, 1 diamond wire saw can cut 30m anticollision barrier every day, only needs 2 individual cooperations, has practiced thrift a large amount of manpowers, material resources very obviously, has improved the efficiency of construction effectively, and is visible, and diamond wire saw cutting concrete barrier has produced good effect, and the technique is feasible, and the construction progress is fast, has good economic benefits and security benefit, extensive application prospect.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A method of demolishing a concrete guardrail on a bridge, the method comprising the steps of:

dividing a concrete guardrail on a bridge into a plurality of guardrail units along the bridge direction, and marking the cutting sections of the guardrail units;

respectively cutting the guardrail units along the cutting section by using a diamond wire saw until all the guardrail units are cut;

the cutting sections of the guardrail units comprise at least one transverse section and at least one vertical section, and the diamond wire saw cuts the guardrail units according to the sequence of transverse cutting and vertical cutting;

divide concrete guardrail on the bridge for following bridge a plurality of guardrail unit of bridge to along the bridge to mark the sectional concrete step of cutting of guardrail unit does:

dividing the concrete guardrail into a plurality of guardrail units along the bridge direction of the bridge;

paying off and marking the cutting section of each guardrail unit, wherein the cutting section comprises at least one transverse section and at least one vertical section;

the diamond wire saw comprises a wire saw and a diamond wire, and the specific steps of respectively cutting the guardrail units along the cutting section by using the diamond wire saw are as follows:

a rope threading hole for a diamond rope to pass through is formed in the cutting section of the guardrail unit;

winding the diamond rope on the rope sawing machine after the diamond rope passes through the rope threading hole and surrounds a cutting section for a circle;

driving the diamond wire to cut the fence unit according to a cutting direction using the wire saw;

the method further comprises the steps of:

the method comprises the following steps of arranging hoisting holes in advance on the guardrail units, wherein the hoisting holes and the rope threading holes are arranged in the same process, the hoisting holes are arranged at the upper parts of the guardrail units, the rope threading holes are arranged at the positions, close to the bottoms, of the guardrail units, and the hoisting holes are used for enabling the cut guardrail units to be pulled by foreign objects in the cutting process;

and when the guardrail unit is cut, hoisting the cut guardrail unit through the hoisting hole.

2. The method of demolishing a concrete guardrail on a bridge according to claim 1, wherein the diamond wire is tensioned using the diamond wire saw.

3. The method for demolishing a concrete guard rail on a bridge according to claim 1, wherein a plurality of diamond wire saws are simultaneously used to cut the plurality of guard rail units, respectively.

4. The method for demolishing a concrete guard rail on a bridge according to claim 1, wherein the method further comprises the steps of:

and chiseling a groove on the marked cutting section on the guardrail unit.

5. The method for demolishing a concrete guard rail on a bridge according to claim 1, wherein the cut guard rail unit is hoisted through the hoisting hole using a hoist on a deck of the bridge.

6. The method for demolishing a concrete guard rail on a bridge according to claim 1, wherein the method further comprises the steps of:

and carrying out water cooling treatment on the part being cut by the diamond wire saw.

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