CN103470093B - Concrete chimney dismantling method - Google Patents

Abstract

A device for dismantling a concrete chimney, including a positioning mechanism, an operating platform, and a hoisting mechanism; the positioning mechanism includes a hoop, a connecting head, and a hanging lug; There is a connecting head at the center of the hoop, and multiple hanging ears are evenly arranged on the outer wall of the hoop; the operating platform includes a trapezoidal platform, hooks and railings, and the bottom of the trapezoidal platform is provided with diagonal braces, and the hooks and railings are respectively fixed on both sides of the trapezoidal platform. The railing and the trapezoidal platform are set vertically, and the hooks match the hanging ears; the hoisting mechanism includes hoisting ropes, fixtures and hoisting tools, the hoisting rope is fixed on the hoop, and the fixtures are fixed on the side wall of the concrete chimney. Used in conjunction with lifting tools. The demolition device has a simple structure, can be made from waste materials at the construction site, has low cost, can be used repeatedly, and avoids waste of materials; the demolition method of the present invention is simple and easy to operate, has high safety, does not damage surrounding buildings, and works The effect is high.

Description

Concrete Chimney Removal Method

technical field

The invention relates to a device and method for dismantling a brick-concrete towering building, in particular to a device and method for dismantling a concrete chimney.

Background technique

The traditional demolition method of brick-concrete towering buildings is blasting or impact. This traditional demolition method is not only dangerous, but also destructive. Once the force is not well controlled, it may cause damage to other buildings.

At present, the staged demolition method can also be adopted for brick-concrete high-rise buildings, but it needs to build a high scaffold as an operating platform, which requires a large amount of work and serious waste of materials, and this staged demolition method is mostly suitable for square or round buildings. Tubular buildings. And the demolition difficulty of towering buildings with conical barrel structures such as chimneys is relatively large, especially the demolition of concrete chimneys. The conventional demolition method has a long construction period and low work efficiency, which cannot meet the construction progress.

Contents of the invention

The invention aims at the defects of the traditional concrete chimney dismantling method in the background technology. Firstly, it provides a simple-structured and reusable concrete chimney dismantling device; secondly, it provides a method for dismantling the concrete chimney with this device.

The technical solution adopted by the present invention is: a concrete chimney demolition device, including a positioning mechanism, an operating platform and a hoisting mechanism;

The positioning mechanism includes a hoop, a connector and a hanging ear; the hoop is a ring-shaped structure composed of multiple arc-shaped plates, and a connector is provided at the interface of each segment of the arc-shaped plate, and a plurality of hanging ear;

The operating platform includes a trapezoidal platform, a hook and a railing, the bottom of the trapezoidal platform is provided with a diagonal brace, the hook and the railing are respectively fixed on both sides of the trapezoidal platform, the railing is vertically arranged with the trapezoidal platform, and the hook matches the hanging ear;

The hoisting mechanism includes a hoisting rope, a fixture and a hoisting tool, the hoisting rope is fixed on the hoop, the fixture is fixedly installed on the side wall of the concrete chimney, and the hoisting rope, the fixture and the hoisting tool are used together.

The connector includes two angle steels fixed respectively at the free ends of the hoop interface, one side of which is fixed to the outer wall of the hoop, and the other side is vertically vertical to the outer wall of the hoop; the two angle steels are connected by stud bolts.

The hanging lug is an angle steel, one side of which is fixed to the outer wall of the hoop, and the other side is horizontally perpendicular to the outer wall of the hoop; the horizontal surface of the hanging ear is also provided with a long hole matched with the hook.

The trapezoidal platform is a trapezoidal horizontal frame, and the bottom of the trapezoidal platform is fixedly connected with a triangular diagonal brace, and the vertical surface of the diagonal brace is attached to the outer wall of the concrete chimney.

The jig is welded by three angle steels, two vertical angle steels and one horizontal angle steel are welded together, and one of the vertical angle steels is provided with side ears perpendicular to it.

Both ends of the upper beam of the railing of the trapezoidal platform are provided with reserved holes.

The method for removing the concrete chimney with said device is carried out according to the following steps:

A. Preliminary preparation

a. The dismantling sequence of the concrete chimney is from top to bottom. First place the hoop with the smallest diameter on the ground. The connector of one interface is tightened with a stud bolt and a gap of 20mm is left. The other interface is connected to the position of the concrete chimney ladder. Correspondingly, the two free ends at the interface are respectively provided with fastening ropes connected together by a rope tightener; four lifting rope buckles are evenly arranged along the circumference of the hoop;

b. Select two lifting points on both sides of the ladder on the original platform at the top of the concrete chimney, hang a 0.5t pulley on each, and pull the hoop to a position 1.5m below the original platform. The construction personnel stand on the ladder and use the tight rope Use the device to pull the hoop interface closer, install and tighten the adjustable length bolt on the connector at the interface;

c. First assemble the operation platform on the ground, and the construction personnel stand on the ladder and use the pulleys that have been installed to hoist each operation platform in place one by one, hang the hook on the operation platform on the hanging ear of the hoop, weld it firmly, and install it in sequence can;

d. At a height of 500mm above the operating platform, a steel wire rope is locked around the outer wall of the concrete chimney as a safety rope, and the construction personnel hangs the installation belt on the installation rope;

B. Removal of concrete chimneys

The part above the original platform is demolished: construction workers stand on the original platform of the concrete chimney, and use wind picks and gas cutting to make eight gaps from the top down along the circumference of the concrete chimney. Concrete chimneys are cut into blocks with pneumatic picks and gas cutting;

Partial removal of the cylinder wall:

a. Continue to cut down along the notch, and the bottom of the notch is 0.5m away from the positioning position of the hoop;

b. Drill eight through holes along the circumference of the cylinder wall 200mm below the gap, and install a guide chain on two of the through holes, one end of the guide chain is fixed on the through hole, and the other end is respectively connected to two ends of a movable rope end connection, the movable rope is laid on the split body of the tube wall opposite the guide chain, and the two guide chains are tightened at the same time, so that the split body of the tube wall is stressed toward the inner side of the chimney. Cutting, the block wall splits and falls to the inside of the concrete chimney;

c. Use the same method to remove other cylinder wall splits. After removing a full circle, hang the prefabricated clamps evenly on the four gaps, and connect one end of the four chain hoists with the side ears on the clamps. The other end is connected with the lifting rope buckle on the hoop, and the length of the chain hoist is adjusted to realize the lowering of the hoop;

d. To remove a section of the wall of the concrete chimney, it is necessary to lower the hoop and the operating platform twice. When the gap between the interface of the hoop exceeds 800mm, add a section of arc-shaped plate with a length of 0.8m to the original hoop to connect The interface is fastened with connectors and stud bolts; in this way, it is lowered layer by layer to realize the removal of the concrete chimney wall;

c. When dismantling to the top of the bottom platform of the concrete chimney, remove the hoop and operating platform, and stand on the base platform for dismantling. The dismantling method of the bottom platform is the same as that of the original platform.

With the increase of the radius of the cylinder wall, the short arc-shaped plates in the hoop are replaced with long-arc-shaped plates, and the arc-shaped plates are connected by connectors.

When there is a space greater than 800mm on the hoop, install an operating platform.

Compared with the prior art, the dismantling device disclosed in the present invention has a simple structure, can be made with waste materials at the construction site, has low cost, can be used repeatedly, and avoids waste of materials; the dismantling method disclosed in the present invention is simple and easy to operate, High safety, will not damage the surrounding buildings, high working effect.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the hanging ear in the present invention.

Fig. 2 is a schematic diagram of the structure of the hoop interface in the present invention.

Fig. 3 is a schematic diagram of the installation position of the hoop and hoisting rope in the present invention.

Fig. 4 is a schematic diagram of the structure of the trapezoidal platform in the present invention.

Fig. 5 is a schematic structural diagram of the operating platform in the present invention.

Figure 6 is a schematic diagram of the installation structure of the removal device.

Fig. 7 is a schematic diagram of the structure of the jig in the present invention.

Fig. 8 is a top view of the dismantling method of the wall part of the chimney in the present invention.

Fig. 9 is a side view of the dismantling method of the wall part of the chimney in the present invention.

In the figure: hanging lug 1, hoop 2, connector 3, stud bolt 4, lifting rope buckle 5, fastening rope 6, trapezoidal platform 7, hook 8, diagonal brace 9, railing 10, reserved hole 11, chimney Cylinder wall 12, safety rope 13, operating platform 14, climbing ladder 15, gap 16, side ears 17, bayonet 18, 5t guide chain 19, movable rope 20, fixture 21.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment.

The invention firstly discloses a device for removing a concrete chimney, and secondly discloses a method for removing a concrete chimney by using the device.

The removal device includes a positioning mechanism, an operating platform and a hoisting mechanism.

The positioning mechanism includes a hoop 2, a connecting head 3 and a hanging ear 1. The hoop is a ring-shaped structure composed of multiple sections of arc-shaped plates, as shown in Figure 3, the preferred initial number of sections is two, and connectors are provided at the interfaces of adjacent arc-shaped plates. A plurality of hanging ears are uniformly arranged on the outer wall of the hoop. In this embodiment, as shown in Figure 2, the connector includes two angle steels respectively fixed at the free ends of the hoop interface, one side of which is fixed to the outer wall of the hoop, and the other side is vertically perpendicular to the outer wall of the hoop. The sides of the two angle steels are arranged oppositely, and the two angle steels are connected with stud bolts 4 . As shown in accompanying drawing 1, the hanging ear is also an angle steel, one side of which is fixed to the outer wall of the hoop, and the other side is transversely perpendicular to the outer wall of the hoop, that is, the side is a horizontal plane, and the horizontal surface of the hanging ear is also provided with a hook 8 matching slotted holes.

Make a set of hoops with Q235 100×8 flat steel, leave a gap of about 20mm at the connection position, and make 6m, 4.8m, 3.2m, 2.4m, 1.6m, 0.8m respectively according to the change of chimney diameter (each The difference between each hoop is 0.8m, which is equal to the adjustable size of the bolt, and the quantity specification can be adjusted according to the height of the chimney). Determine the spacing of the lugs on the hoop according to the size of the small platform, and the welding of the lugs, connectors and hoops are all fully welded.

The operating platform includes a trapezoidal platform 7, a hook 8 and a railing 10. The bottom of the trapezoidal platform is provided with diagonal brace 9, and hook 8 and railing 10 are respectively affixed to opposite sides of trapezoidal platform 7, and railing 10 is vertically arranged with trapezoidal platform 7, and hook 8 matches the long hole on the described hanging ear. As shown in accompanying drawing 4-5, the trapezoidal platform 7 is a trapezoidal horizontal frame, and the bottom of the trapezoidal platform is fixedly connected with a triangular diagonal brace 9, and the vertical surface of the diagonal brace is fitted with the outer wall of the chimney tube wall 12 of the concrete chimney. Both ends of the upper beam of the railing 10 of the trapezoidal platform are provided with reserved holes 11 .

The trapezoidal platform is made of Q235 ∠40×4 for the outer frame, and a beam is added in the middle, and 7 flat steel plates of -30×3 are inlaid on it as the bottom plate, and the triangular diagonal bracing is made under the trapezoidal platform, and the diagonal brace is made of Q235. It is made of ∠50×5 angle steel; the platform is connected to the hanging lug on the hoop through two hooks made of φ18 round steel; the production quantity is determined according to the maximum diameter of the demolished chimney.

Hoisting mechanism comprises hoisting rope, fixture 21 and hoisting tool, and hoisting rope comprises safety rope 13 and movable rope 20, and hoisting rope is all connected with hoop, and fixture 21 is fixedly installed on the chimney tube wall of concrete chimney, hoisting rope, clip Tools and lifting tools are used together.

The jig 21 is welded by three angle steels, two vertical angle steels and one horizontal angle steel are welded together, one of the vertical angle steels is provided with a side ear 17 perpendicular to it, and a bayonet 18 is formed between the two vertical angle steels.

The above-mentioned device for removing the concrete chimney can be used repeatedly, and can be converted and used according to the size of the outer diameter of the demolished building.

To remove the concrete chimney with this device, follow the steps below:

A. Preliminary preparation

Take the bottom of the chimney as the center and protect it within a diameter of 10m, draw a cordon and hang a signboard, and non-construction personnel are strictly prohibited from entering; clean up the site to make way for clearing vehicles and hydraulic pick trucks; do not put construction machinery in the In the field, avoid smashing.

a. The sequence of dismantling the concrete chimney is from top to bottom. First place the hoop with the smallest diameter (that is, the initial two sections of hoop) on the ground, and the connector of one interface is tightened with stud bolts and a gap of 20mm is left. , so that the two sections of the hoop can move freely; the other interface corresponds to the position of the concrete chimney ladder 15, and the two free ends at the interface are respectively provided with fastening ropes 6 connected together by a rope tightener; uniformly arranged along the circumference of the hoop Four hoisting rope buckles 5.

b. Choose two reliable lifting points on both sides of the ladder on the original platform at the top of the concrete chimney, hang a 0.5t pulley on each, and pull the hoop to a position 1.5m below the original platform. The construction personnel stand on the ladder and use The rope tightener pulls the hoop interface closer, and installs and tightens adjustable-length stud bolts on the connector at the interface.

c. First assemble the operation platform on the ground, and the construction personnel stand on the ladder and use the pulleys that have been installed to hoist each operation platform in place one by one, hang the hook on the operation platform on the hanging ear of the hoop, weld it firmly, and install it in sequence That's it.

d. At a height of 500mm above the operating platform, a steel wire rope is locked around the outer wall of the chimney wall of the concrete chimney as a safety rope, and the construction personnel hang the installation belt on the installation rope.

B. Removal of concrete chimneys

The part above the original platform is removed:

Construction workers stood on the original platform of the concrete chimney, and used picks and gas cutters to make eight gaps 16 from the top down along the circumference of the concrete chimney. The gaps 16 were opened to the position below the original platform. Cut into blocks with pneumatic picks and gas cutters for demolition.

Partial removal of the cylinder wall:

a. Continue to cut down along the notch, and the bottom of the notch is 0.5m away from the positioning position of the hoop.

b. As shown in Figure 8-9, eight through holes are drilled along the circumference of the cylinder wall 200mm below the gap, and a 5t guide chain 19 is respectively installed on two of the through holes, and one end of the guide chain 19 is fixed in the through hole The other ends are respectively connected with the two ends of a movable rope 20, the movable rope 20 is laid on the cylinder wall split opposite to the guide chain, and the two guide chains are tightened at the same time, so that the cylinder wall split is stressed towards the inside of the chimney, and this At this time, use a pick and gas cutter to cut horizontally at the bottom of the tube wall split, with a depth of about 40mm, and the tube wall split will fall to the inside of the concrete chimney. The guide chain will be loosened automatically, and then the other split concrete blocks will be removed in the same way. After dismantling, move the chain hoist for lifting from above to below, and adjust the chain length of the chain hoist so that the chain is not loose. The size of the demolished concrete block of the cylinder wall is considered according to two situations, 1.7m×0.8m is used for more than 50 meters, and 1.7m×1.4m is used for less than 50 meters, so as to reduce the vibration of the concrete block when it falls freely.

c. Use the same method to remove other cylinder wall splits. After removing a full circle, clamp the bayonets of the four prefabricated clamps at the gaps, and connect one end of the four chain hoists with the side ears on the clamps. 17 connection, the other end is connected with the lifting rope buckle on the hoop, adjust the length of the chain hoist chain to realize the lowering of the hoop; the length of the gap on the chimney wall is controlled at about 1.7m, and the width is controlled at 400mm.

d. To remove a section of the wall of the concrete chimney, the hoop and the operating platform need to be lowered twice. When the gap between the hoop interface connector exceeds 800mm, add a section of arc-shaped plate with a length of 0.8m to the original hoop, that is The hoop is short, and the connecting interface is fastened with a connecting head and a stud bolt; in this way, it is lowered layer by layer to realize the removal of the concrete chimney wall.

c. When dismantling to the top of the bottom platform of the concrete chimney, remove the hoop and operating platform, and stand on the base platform for dismantling. The dismantling method of the bottom platform is the same as that of the original platform.

With the increase of the radius of the cylinder wall, the short arc-shaped plates in the hoop are replaced with long-arc-shaped plates, and the arc-shaped plates are connected by connectors.

The platform is lowered layer by layer in this way. When there is a space greater than 800mm on the hoop, a small platform is added, and the platform is not welded to the hoop, but tied with steel wires; if the hoop meets the legs of the ladder when descending, First weld the top of the ladder to the steel bars on the inner wall of the chimney, and then cut off the outriggers; control the number of hoops within 3, and replace the short hoops with long hoops as the radius increases until the height of +11.5m is removed. After dismantling to +11.5m, the cantilevered operating platform will be dismantled, and the personnel will move to the +10.0m platform to continue dismantling.

Claims (3)

1. a concrete chimney demolition method, utilize concrete chimney demolition device to remove, detaching device comprises detent mechanism, operating platform and hoisting mechanism;

Described detent mechanism comprises anchor ear, connector and hangers; Anchor ear is the circular ring of multistage arc composition, and the interface of each section of arc is provided with connector, and anchor ear outer wall is evenly provided with multiple hangers;

Described operating platform comprises bucking ladder, hook and railing, and the bottom of bucking ladder is provided with diagonal brace, and hook and railing are fixed in the both sides of bucking ladder respectively, and railing is vertical with bucking ladder to be arranged, and hook and described hangers match;

Described hoisting mechanism comprises hoisting rope, jig and lifting device, and hoisting rope is fixed on anchor ear, and jig is fixedly mounted on concrete chimney jambs, hoisting rope, jig and lifting device with the use of;

Described connector comprises the angle steel that two are fixed in anchor ear interface free end respectively, one side and anchor ear outer wall affixed, another side is vertically vertical with anchor ear outer wall; Connect with stud between two angle steel;

Described hangers is angle steel, one side and anchor ear outer wall affixed, another side and anchor ear outer wall are laterally vertical; The horizontal plane of hangers is also provided with and links up with the elongated hole matched;

Described bucking ladder is trapezoid horizontal frame, is connected with leg-of-mutton diagonal brace bottom this bucking ladder, and vertical plane and the concrete chimney outer wall of diagonal brace are fitted;

Described jig is welded by three angle steel, and two vertical angle steel and a horizontal corner steel weld together, and wherein a vertical angle steel is provided with perpendicular picking up the ears;

The railing upper beam two ends of described bucking ladder are provided with preformed hole; It is characterized in that, utilize above-mentioned detaching device to remove concrete chimney and carry out according to following steps:

A, early-stage preparations

The dismounting order of a, concrete chimney is from top to bottom, first anchor ear minimum for diameter is well placed on ground, wherein the connector stud of an interface is tightened and is stayed 20mm gap, another interface is corresponding with concrete chimney climbing ladder position, and two free ends of interface are respectively arranged with the fastening rope linked together with euphroe; Arrange four halliards along anchor ear even circumferential to withhold;

B, select two suspension centres in the cat ladder both sides of concrete chimney top original platform, the pulley of each extension 0.5t, anchor ear is pulled to the position of 1.5m under original platform, constructor stands on cat ladder, utilize euphroe to be furthered by anchor ear interface, the connector of interface installs adjustable stay bolt and tightens;

C, first assemble operating platform on ground, constructor stands in each operating platform to lift with prior mounted pulley by cat ladder one by one and puts in place, hangs on the hangers of anchor ear, firm welding, install the hook on operating platform successively;

D, At The Height at operating platform upwards 500mm, around concrete chimney outer wall locking steel cable as safety rope, mounting strap is suspended in installing rope by constructor;

B, concrete chimney demolition

The above partial demolition of original platform: constructor stands on concrete chimney original platform, eight gap are made a call to downwards along concrete chimney circumference from top with pneumatic pick and gas cutting, gap is opened to the following position of original platform, and concrete chimney part more than original platform and original platform is all removed with the gentle block that cuts off into of pneumatic pick;

Bowl wall portion is removed:

A, continuing cutting downwards along gap, is 0.5m apart from anchor ear position location bottom gap;

B, below gap 200mm barrel on make a call to eight through holes along its circumference, wherein two through holes install a guide chain respectively, one end of guide chain is fixed on through hole, the other end is connected with the two ends of a movable rope respectively, this movable rope is laid in the barrel split on guide chain opposite, and two guide chains are strained simultaneously, makes barrel split stressed inside chimney, now cut in barrel split bottom transverse with pneumatic pick and gas cutting, namely this block barrel split falls down inside concrete chimney;

C, to remove other barrel split by identical method, after removing a whole circle, prefabricated jig is evenly hung on four opening positions, one end of four Chain blocks is connected with picking up the ears on jig, the other end is withheld with the halliard on anchor ear and is connected, adjustment Chain block chain length, realizes anchor ear and declines;

The barrel of d, concrete chimney removes a joint, needs anchor ear and operating platform to lower twice, and when the gap of anchor ear interface connector is more than 800mm, it is the arc of 0.8m that former anchor ear increases a joint length, connecting interface place connector and stud fastening; Successively decline in this way, realize the dismounting of concrete chimney wall part;

E, when above the bottom platform of tearing concrete chimney open, dismantle anchor ear and operating platform, stand on base platform and remove, and the method for dismounting of bottom platform is identical with the method for dismounting of original platform.

2. the method for dismounting concrete chimney according to claim 1, is characterized in that, with the increase of barrel radius, changes the short arc plate in anchor ear into long arc shape plate, connects between each arc with connector.

3. the method for dismounting concrete chimney according to claim 1, is characterized in that, when anchor ear occurring the room being greater than 800mm, installs an operating platform additional.