CN115288476A - Water jet breaking and dismantling method based on pre-cracked concrete structure - Google Patents

Abstract

The invention discloses a water jet breaking method based on a pre-cracked concrete structure, comprising: (1) positioning and drilling a reinforced concrete structure to be broken; (2) using a hydraulic splitter and an expansion material to drill Pre-crack the concrete structure; (3) Move the high-pressure water jet to dismantle the robot equipment, so that the mechanical arm is close to the spray range of the concrete structure surface, and adjust the angle of the spray device; (4) Start the equipment pressure pump, control the pressure intensity of the spray water, and operate The demolition robot erodes the concrete structure, and while the concrete is demolished, the internal vertical and horizontal steel bars are well preserved; (5) The concrete waste slag demolished on site is collected and processed. By using the high-pressure water jet method to break the concrete, the invention not only saves labor, but also reduces environmental pollution and damage to the original structure, and the method of drilling + concrete pre-splitting is used before breaking, which greatly improves the subsequent breaking process. Demolition efficiency, to meet construction design requirements.

Description

A Water Jet Rescue Method Based on Precracked Concrete Structure

technical field

The invention relates to the technical field of building construction, in particular to a water jet demolition method based on a pre-cracked concrete structure.

Background technique

At present, the demolition methods of concrete structures in construction projects are mainly manual demolition and mechanical equipment demolition. Among them, manual demolition requires workers to break up the concrete surface with hand-held pneumatic pick equipment on a temporary work platform. High requirements, high risk, low demolition efficiency, and long construction period; mechanical demolition uses large-scale mechanical demolition equipment to chisel out concrete structures, which is difficult to construct, complex to operate, and low in precision. The requirements are strict, and the concrete dust generated during the construction process is likely to pollute the environment. Often due to the high impact strength of the mechanical drill bit, the cracks in the original concrete structure will expand, and the internal steel bars will be severely damaged, which is not conducive to the subsequent structural stress. Traditional manual and mechanical demolition methods have problems such as low construction efficiency, high quality and safety hazards, and many environmental impact factors. Therefore, it is of great engineering significance to develop a water jet demolition method based on pre-cracked concrete structures.

Contents of the invention

In view of the problems existing in the prior art methods, the purpose of the present invention is to provide a pre-cracked concrete that is environmentally friendly and dust-free, has a high safety factor for on-site operations, and has a short construction period and will not cause damage to the reinforced concrete in the non-demolition part of the original structure. Non-destructive demolition method of structural water jetting.

The present invention provides the following technical solutions: a water jet demolition method based on pre-cracked concrete structures, comprising the following steps:

(1) Determine the location of the steel bars inside the concrete structure based on the scanning of the steel bar detector, and perform drilling positioning based on the vertical concrete surface without reinforcement, and use a pneumatic rock drill to drill and clear the holes along the direction of the positioning point;

(2) Pre-split the reinforced concrete structure by means of hydraulic splitting machine and expansion material;

(3) Move the high-pressure water jet demolition robot equipment so that the mechanical arm is close to the spraying range of the concrete structure surface, adjust the angle of the spraying device, and set up a protective barrier;

(4) Start the equipment pressure pump, control the pressure intensity of the spray water, operate the demolition robot to erode the concrete structure, and keep the internal vertical and horizontal steel bars intact while destroying the concrete;

(5) Collect and treat the concrete waste slag removed on site to reduce construction waste pollution.

Further, the diameter of the drill hole described in step (1) is 42mm, and the drill hole depth is 100-150mm.

Further, the drilled holes described in step (1) are distributed in a grid shape, the horizontal row spacing of the drilled holes is 250-350mm, and the vertical row spacing is 300-450mm. Pre-cracking destroys the original structure.

Further, the splitting force of the hydraulic splitter described in step (2) is 800T, and its front end splitter is split into the borehole, and after starting the splitter, each borehole is divided according to two orthogonal Split once in each direction, and the time for each split is 8-10 seconds.

Further, the expansion material described in step (2) is a static expansion agent and water in a ratio of 3:1, and after mixing, a sticky slurry with good fluidity is formed, wherein the static expansion agent is used in an amount of 10-20kg/time , resulting in expansion pressure ≥ 50MPa.

Further, the expansion slurry described in step (2) should be injected into the borehole within 30 minutes after the completion of sufficient mixing, and poured to the surface close to the hole. The horizontal drilling needs to be plugged to prevent the expansion slurry from leaking. The cracking time is 8-12h.

Further, the demolition robot described in step (3) reasonably adjusts the spraying angle and target distance according to the field position range conditions, and the spraying target distance is 50-110mm.

Further, the water jet pressure strength described in step (4) is determined according to the strength and depth of the concrete structure in the area to be demolished, and the water pressure range is 100-150 MPa.

Further, the hydraulic power system and injection system inside the demolition robot are controlled through the remote control system, and the parameters set by the equipment under each working condition are collected, which is beneficial to the improvement of the demolition method.

Through above technical scheme, compared with existing technology, the beneficial effect that the present invention produces is:

(1) The water jet demolition method based on pre-cracked concrete structures provided by the present invention can quickly demolish reinforced concrete structures. Compared with traditional demolition methods, not only the demolition efficiency is greatly improved, but also the labor force can be reduced. Strength, dust-free demolition of concrete, to achieve efficient construction, safe construction and green construction.

(2) On the basis of high-pressure water jet technology, the present invention further combines the method of concrete pre-cracking, and accelerates the expansion of cracks inside the concrete structure by drilling and filling expansion materials before demolition, providing favorable conditions for water jet breaking, The water jet demolition efficiency increases from ≤0.5m3/h to 0.8-1.0m3/h after pre-splitting, and the overall efficiency is more than doubled.

(3) A kind of water jet demolition method based on pre-cracked concrete structure adopted in the present invention fully utilizes the crushing mechanism of water jet to realize the non-destructive retention of the internal steel bars of the demolition structure, which is beneficial to the welding connection and pouring reinforcement of the later steel bars, And it can achieve precise demolition effect without causing damage to the concrete structure in the non-demolition area, further improving the quality of demolition.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative labor:

Fig. 1 is a schematic diagram of the drilling plane layout of the reinforced concrete structure of the present invention;

Fig. 2 is the drilled sectional schematic diagram of reinforced concrete structure of the present invention;

Fig. 3 is the hydraulic splitting machine pre-crack schematic diagram in reinforced concrete structure hole of the present invention;

Fig. 4 is the schematic diagram of pre-cracking of expansion material in reinforced concrete structure hole of the present invention;

Fig. 5 is a schematic diagram of the high-pressure water jet demolition of the pre-split concrete structure of the present invention.

In the figure: 1. Concrete structure; 2. Rebar; 3. Drilling; 4. Pneumatic rock drill; 5. Expanding material; 6. Demolition robot; 7. Spraying device.

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments. In order to more clearly describe the purpose, technical solutions and innovations of the present invention, the following will be further described in conjunction with some embodiments of the present invention, but not all embodiments, and are used here as schematic embodiments and descriptions of the present invention. The present invention is explained, but not as a limitation of the present invention.

It should be noted that in the present invention, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical A connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

Example 1

A water jet demolition method based on pre-cracked concrete structure is characterized in that it comprises the following steps:

(1) Determine the position of the internal reinforcement 2 of the concrete structure 1 according to the scanning of the reinforcement detector, perform the positioning of the drilling 3 based on the vertical concrete surface without reinforcement, and use the pneumatic rock drill 4 to drill the hole 3 and clear the hole along the direction of the positioning point; , the diameter of the boreholes 3 is 42mm, and the depth of the boreholes 3 is 150mm; the boreholes 3 are distributed in a grid pattern, the horizontal row spacing of the boreholes 3 is 300mm, and the vertical column spacing is 350mm. Keep an appropriate distance from the non-demolition area to prevent pre-cracking from damaging the original structure, as shown in Figure 1.

(2) Adopt the mode of hydraulic splitting machine to carry out pre-cracking to reinforced concrete structure 1; Wherein, the splitting force of described hydraulic splitting machine is 800T, and its front end splitter splitting block is inserted in the borehole, starts splitting After the splitter, each borehole is split once according to two orthogonal directions, as shown in Figure 3, and each splitting time is 8-10 seconds.

(3) Move the high-pressure water jet demolition robot 6 equipment, make the mechanical arm close to the spraying range of the concrete structure surface, adjust the angle of the spraying device 7, and set up a protective barrier; wherein, the demolition robot 6 is based on the field position range conditions Reasonably adjust the spraying angle and target distance, and the spraying target distance is 100mm.

(4) Start the equipment pressure pump to control the spray water pressure intensity, as shown in Figure 5, operate the demolition robot 6 to erode the concrete structure 1, and when the concrete is broken, the internal vertical and horizontal steel bars 2 are kept intact; wherein, the The water jet pressure intensity is determined according to the strength and depth of the concrete structure 1 in the area to be demolished, and the water pressure range is 110MPa.

(5) Collect and treat the concrete waste slag removed on site to reduce construction waste pollution.

The hydraulic power system and injection system inside the demolition robot are controlled by the remote control system, and the parameters set by the equipment under each working condition are collected, which is beneficial to the improvement of the demolition method.

Example 2

A water jet demolition method based on pre-cracked concrete structure is characterized in that it comprises the following steps:

(1) Determine the position of the internal reinforcement of the concrete structure 1 according to the scanning of the reinforcement detector, locate the drilling 3 based on the vertical concrete surface without reinforcement 2, and use the pneumatic rock drill 4 to drill and clear the hole along the direction of the positioning point; wherein, The diameter of the boreholes 3 is 42mm, and the depth of the boreholes 3 is 120mm; the boreholes 3 are distributed in a grid pattern, the horizontal row spacing of the boreholes 3 is 300mm, and the vertical column spacing is 300mm. Keep an appropriate distance in the non-demolition area to prevent pre-cracking from damaging the original structure, as shown in Figure 1.

(2) The reinforced concrete structure 1 is pre-cracked by means of an expansive material 5, as shown in Figure 4; wherein, the expansive material 5 is a static expansive agent and water in a ratio of 3:1, and after mixing, it is formed with better Fluid sticky slurry, in which the amount of static expansion agent is 18kg/time, and the resulting expansion pressure is ≥ 50MPa; the expansion slurry should be injected into the borehole 3 within 30 minutes after the full mixing is completed, and poured to the point close to the hole On the surface, the horizontal drilling needs to be plugged to prevent the expansion slurry from leaking, and the concrete pre-cracking time is 12h.

(3) Move the high-pressure water jet demolition robot 6 equipment, make the mechanical arm close to the spraying range of the concrete structure surface, adjust the angle of the spraying device 7, and set up a protective barrier; wherein, the demolition robot 6 is based on the field position range conditions Reasonably adjust the spraying angle and target distance, and the spraying target distance is 100mm.

(4) start the equipment pressure pump, control the spray water pressure intensity, as shown in Figure 5, operate the demolition robot 6 to erode the concrete structure 1, while breaking the concrete, the internal vertical and horizontal steel bars are kept intact; wherein, the water The jet pressure intensity is determined according to the strength and depth of the concrete structure 1 in the area to be demolished, and the water pressure range is 150MPa.

(5) Collect and treat the concrete waste slag removed on site to reduce construction waste pollution.

The hydraulic power system and injection system inside the demolition robot are controlled by the remote control system, and the parameters set by the equipment under each working condition are collected, which is beneficial to the improvement of the demolition method.

Compared with prior art, the beneficial effect of the present invention is:

(1) The water jet demolition method based on pre-cracked concrete structures provided by the present invention can quickly demolish reinforced concrete structures. Compared with traditional demolition methods, not only the demolition efficiency is greatly improved, but also the labor force can be reduced. Strength, dust-free demolition of concrete, to achieve efficient construction, safe construction and green construction.

(2) On the basis of high-pressure water jet technology, the present invention further combines the method of concrete pre-cracking, and accelerates the expansion of cracks inside the concrete structure by drilling and pouring expansion materials before demolition, providing favorable conditions for water jet breaking, The water jet demolition efficiency increases from ≤0.5m ³ /h to 0.8-1.0m ³ /h after pre-splitting, and the overall efficiency is more than doubled.

(3) A kind of water jet demolition method based on pre-cracked concrete structure adopted in the present invention fully utilizes the crushing mechanism of water jet to realize the non-destructive retention of the internal steel bars of the demolition structure, which is beneficial to the welding connection and pouring reinforcement of the later steel bars, And it can achieve precise demolition effect without causing damage to the concrete structure in the non-demolition area, further improving the quality of demolition.

The technical solutions provided by the embodiments of the present invention have been introduced in detail above, and the principles and implementation modes of the embodiments of the present invention have been explained by using specific examples in this paper. The descriptions of the above embodiments are only applicable to help understand the embodiments of the present invention At the same time, for those of ordinary skill in the art, according to the embodiment of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the present invention.

Claims (9)

1. A water jet demolition method based on pre-cracked concrete structure, is characterized in that, comprises the following steps: (1) Determine the location of the steel bars inside the concrete structure based on the scanning of the steel bar detector, and perform drilling positioning based on the vertical concrete surface without reinforcement, and use a pneumatic rock drill to drill and clear the holes along the direction of the positioning point; (2) Pre-split the reinforced concrete structure by means of hydraulic splitting machine and expansion material; (3) Move the high-pressure water jet demolition robot equipment so that the mechanical arm is close to the spraying range of the concrete structure surface, adjust the angle of the spraying device, and set up a protective barrier; (4) Start the equipment pressure pump, control the pressure intensity of the spray water, operate the demolition robot to erode the concrete structure, and keep the internal vertical and horizontal steel bars intact while destroying the concrete; (5) Collect and treat the concrete waste slag removed on site to reduce construction waste pollution. 2. A water jet demolition method based on pre-cracked concrete structure according to claim 1, characterized in that: the diameter of the drill hole described in step (1) is 42mm, and the drill hole depth is 100-150mm. 3. A kind of water jet demolition method based on pre-cracked concrete structure according to claim 1, characterized in that: the boreholes described in step (1) are distributed in grid form, and the horizontal row spacing of boreholes is 250 -350mm, the longitudinal row spacing is 300-450mm, and the drilling position is kept at a set distance from the non-demolition area to prevent pre-cracking from destroying the original structure. 4. A kind of water jet rescue method based on pre-split concrete structure according to claim 1, it is characterized in that: the splitting force of the hydraulic splitting machine described in step (2) is 800T, and its front end splits The splitter block is inserted into the borehole, and after the splitter is started, each borehole is split once in two orthogonal directions, and each splitting time is 8-10 seconds. 5. A kind of water jet demolition method based on pre-cracked concrete structure according to claim 1, characterized in that: the expansion material described in step (2) is static expansion agent and water according to the ratio of 3:1, mixing Finally, a fluid viscous slurry is formed, in which the amount of static expansion agent is 10-20kg/time, and the resulting expansion pressure is greater than or equal to 50MPa. 6. A water jet demolition method based on pre-cracked concrete structures according to claim 1, characterized in that: the expansion slurry described in step (2) should be injected into the borehole within 30 minutes after the full mixing is completed In the middle, the pouring is close to the surface of the hole, the horizontal drilling needs to be plugged to prevent the expansion slurry from leaking, and the concrete pre-cracking time is 8-12h. 7. A kind of water jet demolition method based on pre-cracked concrete structure according to claim 1, is characterized in that: the demolition robot described in the step (3) carries out spraying angle and target distance according to field position range condition Reasonably adjusted, the spray target distance is 50-110mm. 8. A kind of water jet demolition method based on pre-cracked concrete structure according to claim 1, is characterized in that: the water jet pressure intensity described in step (4) is according to the intensity and the concrete structure of area to be demolished To determine the depth, the water pressure range is 100-150MPa. 9. A kind of water jet demolition method based on pre-cracked concrete structure according to claim 7 or 8, characterized in that: the hydraulic power system and injection system inside the demolition robot are controlled by a remote control system, and all The parameters set by the equipment under working conditions are conducive to the improvement of the demolition method.

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