CN111852482B - Construction method of ore crusher foundation of slip-breaking system engineering below 40m - Google Patents

Abstract

The invention discloses a construction method of a foundation of an ore crusher in a chute breaking system engineering below 40m, which comprises the following steps of firstly expanding and brushing an ore chute with the diameter of 1.4m to be 3.5 m; then, excavating from top to bottom in a layered mode, and constructing a downhill slope with the width of 2.7m and the angle of 35 degrees on the left side of an inlet of the return air connecting channel to serve as an up-and-down access way of the excavator; then, adopting temporary support to stabilize the surrounding rock at the broken part of the surrounding rock, adopting an excavator to rake the slag, and discharging the slag from the bottom of the orepass; finally, excavating the sidewalk, stripping layer by layer, raking the slag by a gangue raking machine, constructing 6m of the lower ore bin as a locking port, and performing permanent reinforced concrete support from bottom to top by adopting support. The whole construction process is simple, the working efficiency is high, and the safety of constructors is also improved.

Description

Construction method of ore crusher foundation of slip-breaking system engineering below 40m

Technical Field

The invention relates to the field of mining, in particular to a construction method of an ore crusher foundation of an ore slipping system engineering with the size of below 40 m.

Background

The slipping system is a common project in the mining field, the working efficiency is not high in the existing slipping system sub-foundation construction process, the construction period is long, especially for slipping systems below 40 meters, foundation construction is carried out below 40 meters, the working efficiency is not high, and the safety index of workers is reduced.

Disclosure of Invention

In order to solve the technical problem, the invention provides a construction method of a foundation of an ore crusher in a slipping system engineering with high working efficiency and less than 40 m.

The technical scheme for solving the problems is as follows: a construction method of a foundation of an ore crusher of a slip system engineering with the size of less than 40m comprises the following steps:

the method comprises the following steps: constructing a chute hole with the diameter of 1.4m by using a raise boring machine, and then blasting a middle-length hole for one-time well formation by multiple times to expand the chute with the diameter of 1.4m into a chute with the diameter of 3.5 m;

step two: after the draw shaft is expanded and brushed, tunneling the part of the crusher foundation more than 2.25 m; constructing a slope with the width of 2.7m and the gradient of 35 degrees as an upper and lower temporary roads of the excavator after 3m of the side line of the designed excavation section retreats from the left side of the inlet of the return air connecting channel, excavating the blasted ballast to a sliding well mouth by the excavator, then opening the excavator into the return air connecting channel from the temporary road, drilling and blasting, and loading the ballast on the sliding well mouth into a dump truck for discharging the ballast through a-40 m chute bottom;

step three: after 2.25m sections of the upper part of the crusher foundation are constructed, continuously excavating for 2.5m downwards, drilling holes by adopting a YTP-28 type rock drill, paying off by technicians when a cannon is excavated every time, ensuring section forming and controlling overbreak; digging the blasted ballast stones to a chute opening of 3.5m by using a digging machine, and then discharging the ballast stones from a-40 m ore bin ore loading chamber by using a forklift; after the slag is discharged, a reinforcing anchor rod is drilled, temporary pipe seam anchor rod support is carried out at the broken part of the rock, and concrete with the thickness of 70mm is sprayed for support;

step four: continuing to tunnel downwards after the temporary support of the crusher foundation is finished, wherein the tunneling height is 2.5m, digging the blasted ballast stones to the chute mouth by using a digging machine after mucking, and then discharging mucks from-40 m by using a forklift; and drilling a reinforcing anchor rod and temporarily spraying concrete for supporting and following to ensure the stability of surrounding rocks;

step five: when the crusher foundation is continuously excavated downwards for 2.46m and constructed to the level of-9.71 m, constructing the pipe cable joint for 4-5 m; digging the slag to the chute mouth by using an excavator, discharging the slag of the rest pipeline and cable connecting channel by using a rock raker, raking the slag to the ore bin chute under the crusher foundation by using the rock raker, and discharging the slag at-40 m by using a forklift;

step six: after the part above the level of-9.71 m of the crusher foundation and the pipe cable channel are communicated with the pipe cable raise, excavating an excavator sidewalk from top to bottom, raking the slag of the blasted slag of the excavator sidewalk by using a scraper loader, and reinforcing the side wall of the crusher foundation on one side of the sidewalk by using an anchor rod to ensure the stability of surrounding rocks;

step seven: after the crusher foundation is horizontally excavated to the proper position, adopting forward excavation, continuously constructing a lower ore bin downwards, and taking the lower ore bin construction 9m as a crusher foundation support locking port section; tunneling 2 m-3 m ore-drawing bin reinforcing anchor rods, and performing temporary concrete spraying support with the thickness of 70 mm; the blasted slag stones slide into a-40 m ore loading chamber through a ore discharging bin chute, then are discharged by a forklift, and are transported by a self-discharging car;

step eight: and (5) carrying out permanent support on the crusher foundation reinforced concrete from bottom to top.

In the eighth step of the construction method of the ore crusher foundation of the slip-breaking system engineering with the size of less than 40m, the permanent support of the reinforced concrete of the crusher foundation comprises the following steps:

8-1) erecting a scaffold;

8-2) installing a rail;

after a central scaffold in a basic ore bin of the crusher is erected, an ore bin lining rail is installed, a 10t stabilizing vehicle is installed in the crushing chamber to serve as lifting equipment, a lifting point is installed at the top of the crushing chamber, a processed channel steel well ring is lowered to the ore bin by using the 10t stabilizing vehicle, the well ring is fixed on an ore bin reinforcing anchor rod in place, then a 6.25 m-long rail is lowered to the position of an ore bin locking opening, the rail is manually matched in place, the central scaffold erected in the ore bin is used for fixing a positioning rail, 12 positioning rails are fixed in each circle, the rail and the channel steel are connected by using bolts, and other channel steel well rings are fixed on the positioning rails by using the positioning rails at intervals of 1 m; after the channel steel well ring is installed, lining rails are continuously installed, the rails are pulled to the underground from the ground through an auxiliary channel by a truck, the rails are unloaded into a crushing chamber, the rails are hoisted to an ore bin by a 10t steady truck, workers are matched to be in place, and the rest of the rails are installed in sequence, wherein the distance between the rails is 180 mm;

8-3) constructing steel bars;

after the basic steel bars of the crusher are bound, performing stable-mould masonry concrete operation, wherein the steel bars are bound in sequence, the frame is bound → the main steel bars are encrypted → the hooped steel bars are bound → the supporting and fixing sequence is used for continuous binding construction, binding platforms are erected along with the increase of binding height, the platforms are erected in layers by adopting frame pipes and fasteners, the height of each layer of platform is 1.2m, the platforms are firmly supported by support rods and are bound, 50mm thick wood boards are paved on the platforms, and the two ends of each wood board are firmly bound by iron wires;

8-4) stabilizing the mold;

the crusher foundation adopts a combined template for stabilizing the mold, the length of the combined template is 1.2m, the width of the combined template is 0.3m, the template is installed from bottom to top by utilizing an erected central scaffold, the template is abutted against a reinforced frame pipe and is reinforced from bottom to top at the same time, one end of a jacking support is placed in a central scaffold steel pipe, and the other end of the jacking support is supported on the reinforced template frame pipe;

8-5) pouring concrete;

after the template is stabilized, checking the template, informing a ground mixing station to mix materials after the template is qualified, transporting the materials to a crushing chamber port by using a concrete transportation tank car, installing a concrete delivery pump at the crushing chamber port, and feeding the materials to a locking port section of the ore bin by using the delivery pump for concrete pouring; when concrete is poured, symmetrically moving the pipes for pouring, and vibrating by using a vibrating rod; pumping concrete is adopted for building, the concrete is marked with a concrete label C25, and a mining concrete delivery pump is arranged at the connection position of the large member channel of the underground chamber for delivery; building a centralized stirring station on the ground, stirring the materials by adopting a JS750 stirrer, conveying the materials to a well bottom conveying pump by adopting a concrete tank truck, and directly pouring the materials into the conveying pump for conveying;

8-6) determining the excavation and caving backfill supporting form of the crusher foundation.

In the construction method of the ore crusher foundation of the below 40m chute system engineering, in the step 8-1), the scaffold erection sequence is as follows: tamping and leveling a foundation, paying off and positioning, putting a skid, putting a transverse floor sweeping rod, erecting a rod, longitudinally sweeping the floor, a first step transverse rod, a first step longitudinal rod, a cross brace and other rods.

In the step 8-1), the scaffold is erected by using a phi 48 x 6m steel pipe, the distance between vertical rods is 0.8m, the distance between horizontal rods is 0.8m, the connectors of the vertical rods and the horizontal rods are in a straight buckle, and the cross braces and the support rods are in movable buckles, so that the erected scaffold is guaranteed to be horizontal and vertical.

In the construction method of the foundation of the ore crusher in the slip-breaking system engineering below 40m, in the step 8-5), the HBTS30-8-30K type mining conveying pump is selected as the conveying pump, and the maximum horizontal conveying distance is 300 m; the maximum vertical conveying distance is 90 m; the pipe diameter of the conveying pipe is 125mm, and the conveying capacity is 30m 3/h; the maximum conveying aggregate is 40 mm; the concrete slump range is 120-160.

The construction method of the ore crusher foundation of the slip-breaking system engineering with the size of less than 40m is characterized in that in the step 8-5), the concrete pumping process comprises the following steps:

a. before pumping concrete, adjusting the oil quantity of a main oil pump to be maximum, adding enough water into a hopper, and running for 10 minutes in an empty state, and checking whether the system pressure, a stirring device and the pumping action are normal or not;

b. the pipeline is lubricated by mortar, the dosage of the pipeline is 0.5m3/200m, the mixing ratio of the sand to the cement is 1: 1, the discharge capacity of an oil pump is adjusted to be minimum when the mortar is pumped, and the pumped concrete is poured after the mortar is pumped.

In the construction method of the ore crusher foundation of the slip breaking system engineering below 40m, in the step 8-5), in the concrete pumping process,

if the concrete entering the hopper has a separation phenomenon, stopping pumping, and pumping after uniformly stirring; in the concrete conveying process, the pump materials are kept above the stirring axis;

if the shutdown time exceeds 30-40 minutes, removing the concrete from the pump and the conveying pipe, when the pumping of the concrete vertically upwards is interrupted and the pumping is carried out again, firstly carrying out a reverse pump to suck the concrete in the separating valve back to the hopper, and then carrying out positive pumping after stirring;

in the pumping process, if the pressure of pumping is suddenly increased or the conveying pipeline vibrates, a reverse pump button is opened to enable the pump to reversely pump for 2-3 strokes, and then the reverse pump button is closed to enable the pumping to continue; or knocking the easy-to-block part of the conical pipe and the bent pipe by a wooden hammer, and stopping the machine to perform pipe blocking treatment if the continuous operation is carried out for a plurality of times and the pumping pressure is not returned to normal;

the temperature of the hydraulic oil is noticed in the pumping process, and when the temperature of the oil rises to 70 ℃, the machine is stopped for cooling treatment;

after the concrete pumping operation is finished every time, the concrete remained in the cylinder, in the pipeline and on the machine frame shell is cleaned and flushed.

The invention has the beneficial effects that: the excavation depth of the crusher foundation is 12.985m, the section is irregular, and the expanding brush of a 1.4m drop shaft is 3.5 m; then, excavating from top to bottom in a layered mode, and constructing a downhill slope with the width of 2.7m and the angle of 35 degrees on the left side of an inlet of the return air connecting channel to serve as an up-and-down access way of the excavator; then, adopting temporary support to stabilize the surrounding rock at the broken part of the surrounding rock, adopting an excavator to rake the slag, and discharging the slag from the bottom of the orepass; finally, excavating the sidewalk, stripping layer by layer, raking the slag by a gangue raking machine, constructing 6m of the lower ore bin as a locking port, and performing permanent reinforced concrete support from bottom to top by adopting support. The whole construction process is simple, the working efficiency is high, and the safety of constructors is also improved.

Drawings

FIG. 1 is a flow chart of the present invention.

Fig. 2 is a schematic view of the construction structure of the present invention.

Fig. 3 is a schematic view of an access way for the upper and lower sides of a shovel in accordance with the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings and examples.

Take the basic ore crusher engineering of ore crushing system engineering below 40m of 400 ten thousand t/a second-stage mining engineering of Yuxi Dahongshan mining Co. The ore crusher foundation engineering is broken by slipping under 40m in 400-kiloton/a second-stage mining engineering of Yuxi Dahongshan mining Limited company, the ore crusher foundation is positioned below 0m level of an ore crushing chamber, the tunneling section of the crusher foundation is in an irregular shape and is supported by C25 reinforced concrete, an anchor rod and I-shaped steel are used for reinforcement, the depth of the crusher foundation is 13.602m, the length of the crusher foundation is 15.5m, the width of a mineral bearing section of the crusher foundation is 8.5m, and the width of a hydraulic foundation part is 6.9 m. The crushing chamber mainly comprises an ore receiving port section, a crusher base section, a crusher ore discharging port section and a hydraulic station, wherein an ore receiving port opening of the crusher is positioned on a bottom plate of the crushing chamber and is communicated with the crushing chamber, the hydraulic station is communicated with a pipe cable connecting channel, and an ore discharging port of the crusher is connected with an ore discharging bin.

Preparation work is required before construction, and the preparation work comprises the following steps:

1. power supply and illumination:

the power is carried out from the distribution chamber, the power is led to a transformer in the transformation chamber through a slope way and a large piece way, the power is connected to the opening point position of the ore crushing chamber through the transformer, the lap joint distance is about 80m, and a cable is hung on the rock wall of the roadway through a hook. 2 220V projection lamps are installed in the crushing chamber, 2 36V searchlights are matched on the basic working surface of the crusher, and each operator is matched with a lithium battery miner lamp for illumination.

2. Water supply and drainage:

water is received from a 100m fork of the second-stage slope way and is connected to a 0m opening point working face, and the lap joint distance is about 900 m. A phi 50mm steel pipe is used as a main water supply pipeline, the pipeline is drilled by an impact electric drill and is hung by an iron wire in a pre-buried cement expansion screw, the pipeline is hung neatly, a joint is connected compactly, a water leakage phenomenon cannot occur, and a working face water supply pipe supplies water by adopting a 1-inch rubber pipe.

The sewage of the crusher foundation construction flows into a horizontal water sump of 40m through a ore-discharging sump pass, a submersible pump is installed at the position of the water sump, the water is discharged to a temporary water sump of 0m and then is discharged to a temporary water sump of 180m along a slope, the length of a drain pipeline is about 1800m, and as the water discharge amount is small during construction, mainly used for drilling machine construction, steel pipes with the diameter of 70mm and the length of 3.5mm can be arranged along the slope for drainage.

3. Discharge of waste rock

The waste rock above the basic ore receiving port of the crusher is discharged from a shovel car from the level of 0m, the waste rock below the ore receiving port passes through a lower ore bin chute, is discharged from a-40 m lower ore bin loading chamber by the shovel car, is discharged to a skip shaft ore bin, is lifted to the ground by a skip, and is discharged to a place specified by a proprietor through the ground ore bin by the car.

4. Material transport

The materials are transported to the working face from the ground storage yard of the waste rock skip through the slope and the secondary auxiliary slope, and the transport distance is about 21 KM.

5. Communication

The underground communication system provided by the owner installs the mine safety telephone underground, so that the underground communication is convenient.

6. Compressed air

2 40m 3 pressure fans are installed at the wellhead of the waste rock skip shaft, and the pressure fans are connected to the crushing chamber through a return air channel through the waste rock skip shaft. The main compressed air pipe is a seamless steel pipe with the diameter of phi 108 multiplied by 4. The working surface adopts a hose and is provided with an air distributor.

7. Ventilation

Because of the broken chamber return air antithetical couplet says and communicates with each other with major possession way, the natural wind stream that gets into from the skip shaft can satisfy the basic construction requirement in earlier stage of breaker, and the later stage is according to the working face condition, and the fan of installation a 5.5kw is equipped with 600 mm's rubber dryer and can satisfy the construction demand as wind-guiding facility.

8. Measuring work in construction

The construction survey professional must be familiar with the relevant construction drawing, checking and calculating the relevant data of the survey, and make a survey design scheme on the basis of carefully accepting the survey data and the stake provided by the owner. And making daily measurement according to the detailed measurement. Attention is paid to arrangement and collection of related mapping data, actual measurement drawings and original records so as to be handed over to an owner after the project is completed.

As shown in figure 1, the construction method of the ore crusher foundation of the slip-breaking system engineering with the size of less than 40m comprises the following steps:

the method comprises the following steps: constructing a chute hole with the diameter of 1.4m by using a raise boring machine, and then blasting a middle-length hole for one-time shaft forming step by step to expand and brush the chute hole with the diameter of 1.4m into a chute hole with the diameter of 3.5m, as shown in the figure 2I;

step two: after the draw shaft is expanded, tunneling the part of the crusher foundation more than 2.25m, such as the second part in figure 2; constructing a slope with the width of 2.7m and the gradient of 35 degrees as an upper and lower temporary roads of the excavator after 3m of the side line of the designed excavation section retreats from the left side of the inlet of the return air connecting channel, excavating the blasted ballast to a sliding well mouth by the excavator, then opening the excavator into the return air connecting channel from the temporary road, drilling and blasting, and loading the ballast on the sliding well mouth into a dump truck for discharging the ballast through a-40 m chute bottom;

step three: after 2.25m sections of the upper part of the crusher foundation are constructed, continuously excavating downwards for 2.5m, as shown in the third step in the figure 2, drilling holes by adopting an YTP-28 type rock drill, and paying off by a technician when a cannon is excavated every time, so that the section is ensured to be formed, and the overbreak and the underexcavation are controlled; digging the blasted ballast stones to a chute opening of 3.5m by using a digging machine, and then discharging the ballast stones from a-40 m ore bin ore loading chamber by using a forklift; after the slag is discharged, a reinforcing anchor rod is drilled, temporary pipe seam anchor rod support is carried out at the broken part of the rock, and concrete with the thickness of 70mm is sprayed for support;

step four: continuing to dig downwards after the temporary support of the crusher foundation is finished, wherein the digging height is 2.5m, as shown in the fourth step in the figure 2, digging the blasted ballast to a chute port by using a digging machine after mucking, and then discharging muck from-40 m by using a forklift; and drilling a reinforcing anchor rod and temporarily spraying concrete for supporting and following to ensure the stability of surrounding rocks;

step five: continuously excavating the foundation of the crusher for 2.46m downwards, and constructing the pipe cable for 4-5 m when constructing to the level of-9.71 m as shown in figure 2; digging the slag to the chute mouth by using an excavator, discharging the slag of the rest pipeline and cable connecting channel by using a rock raker, raking the slag to the ore bin chute under the crusher foundation by using the rock raker, and discharging the slag at-40 m by using a forklift;

step six: excavating an excavator sidewalk from top to bottom after the part of the crusher foundation above the level of-9.71 m and the pipe cable channel are communicated with the pipe cable raise, wherein the excavator sidewalk is shown as figure 2, raking mucks of the blasted mucks of the excavator sidewalk are raked by a raking machine, and anchoring rods are arranged on the side wall of the crusher foundation on one side of the sidewalk for reinforcement to ensure the stability of surrounding rocks;

step seven: after the crusher foundation of-9.71 m is horizontally excavated in place, forward excavation is adopted, a lower ore bin is continuously constructed downwards, and the construction time of the lower ore bin of 9m is taken as a supporting locking port section of the crusher foundation, which is shown as the symbol (c) in fig. 2; tunneling 2 m-3 m ore-drawing bin reinforcing anchor rods, and performing temporary concrete spraying support with the thickness of 70 mm; the blasted slag stones slide into a-40 m ore loading chamber through a ore discharging bin chute, then are discharged by a forklift, and are transported by a self-discharging car;

step eight: and (5) carrying out permanent support on the crusher foundation reinforced concrete from bottom to top.

In the eighth step of the construction method of the ore crusher foundation of the slip-breaking system engineering with the size of less than 40m, the permanent support of the reinforced concrete of the crusher foundation comprises the following steps:

8-1) erecting a scaffold;

firstly, the bottom of the ore bin is tamped, leveled and settled, and a central main body scaffold is erected in the ore bin according to the section size of the ore bin. The scaffold is erected by adopting phi 48 x 6m steel pipes, the distance between the vertical rods is 0.8m, the distance between the cross rods is 0.8m, the connectors of the vertical rods and the cross rods are buckled in a straight line, movable buckles cannot be used, and the cross braces and the support rods are buckled movably, so that the erected scaffold is horizontal and vertical. When the scaffold is erected, bent, flattened or cracked pipes are forbidden to use, the connecting parts of the pipes are intact to prevent toppling or moving, in order to prevent the scaffold pipes from being pressed and bent to enable the fasteners to slide off the pipe heads, the intersecting extending ends of the rod pieces are larger than 10 centimeters, and the outer side of the scaffold, the chute and the platform need to be provided with 1.2 meters of protective guards. When the pedal is laid, the two ends of the pedal are bound firmly by iron wires, and the pedal is forbidden to be used without binding.

Before the scaffold is set up, the field scaffold rod fittings must be strictly checked, the rod fittings with unqualified specifications and quality are forbidden to be used, and a scaffold worker must have operation qualification certificate. Paying off, laying a base plate and setting the position of a base according to the construction design. The layer height is 1.0m and the spacing is 1.0 m. The integral tie rods such as the scissor supports, the diagonal rods and the like are arranged in time along with the overlapped racks.

The scaffold erection sequence is as follows: tamping and leveling a foundation, paying off and positioning, putting a skid, putting a transverse floor sweeping rod, erecting a rod, longitudinally sweeping the floor, a first step transverse rod, a first step longitudinal rod, a cross brace and other rods.

The scaffold is constructed the main points:

1. according to the design characteristics and field conditions of the project, the outer scaffold adopts a steel pipe double-row scaffold with the diameter of 48 mm and the wall thickness of 3.5mm, the vertical distance of the vertical rods is 0.8m, the transverse distance of the vertical rods is 0.8m, the distance of the inner vertical rods to the ore bin is 0.30m, and the step distance of the vertical rods is 1.2 m; the spacing of the rods at the beam position was 0.4m x 0.4 m. The shelf is reinforced by the aid of the cross braces, and the shelf is connected with the original external shelf and the wall connecting piece by the aid of the 6m diagonal rods, so that integrity of the shelf is guaranteed in a full shelf mode.

2. The big horizontal pole is located the pole setting inboard, and its length is not less than 3 spans, and the vertical interval of the inboard big horizontal pole of outrigger is 0.8m, and the vertical interval of the big horizontal pole in the outside is 0.8 m.

3. The distance between the small cross bars is 0.8m, the small cross bars are arranged under the large cross bars, and the extending length of the side close to the wall is not more than 500 mm.

4. The pole setting is connected with big horizontal pole: the pole setting is except that top layer top step can adopt the overlap joint, and overlap joint length is not less than 1 meter, adopts to be no less than 2 rotatory fasteners, fastener tip apart from the tie rod end not less than 100 outside, and all the other all should adopt butt joint fastener to connect, and the joint should stagger not in synchronous, and staggered distance is not less than 500mm, and the distance of each joint center to main node should not be greater than 600 mm.

5. The connection of big horizontal pole should be connected to the butt joint fastener, also can adopt the overlap joint, connects and should stagger in asynchronous, different strides, and staggered distance is not less than 500mm, and the distance of each joint center to main node should not be greater than 500mm, and overlap joint length is not less than 1 meter, should equidistant 3 rotatory fasteners of adoption fix, and the fastener tip is not less than 100mm apart from the connector rod end.

6. The scissors are arranged: the longitudinal cross braces are continuously arranged on the outer vertical surface, the width of each cross brace is not less than 4 spans and not more than 6 spans, an angle of 45-60 degrees is formed between each cross point and the ground, each cross point uses a rotary fastener to fix the cross brace diagonal with the extending end of the vertical rod or the small cross rod, the distance from the center of each joint to the main node is not more than 150mm, the extension of the cross brace diagonal is connected in a lap joint mode, the joint requirement is the same as that of the lap joint of the vertical rods, a transverse cross brace is arranged at each 6 spans between each corner and the middle of each cross brace, the cross braces are continuously arranged in a zigzag mode from bottom to top, the diagonal is fixed at the extending end of the small cross rod which is intersected with the diagonal by not less than 2 rotary fasteners, and the distance from the center of each joint to the main node is not more than 150 mm.

7. The connection point is set up: from the first step of big horizontal pole of bottom, every step frame of scaffold frame all links to each other with former outrigger to set up the tie-in point department at former outrigger two-step three-span and carry out the direct connection.

8-2) installing a rail;

after a central scaffold in a basic ore bin of the crusher is erected, an ore bin lining rail is installed, a 10t stabilizing vehicle is installed in the crushing chamber to serve as lifting equipment, a lifting point is installed at the top of the crushing chamber, a processed channel steel well ring is lowered to the ore bin by using the 10t stabilizing vehicle, the well ring is fixed on an ore bin reinforcing anchor rod in place, then a 6.25 m-long rail is lowered to the position of an ore bin locking opening, the rail is manually matched in place, the central scaffold erected in the ore bin is used for fixing a positioning rail, 12 positioning rails are fixed in each circle, the rail and the channel steel are connected by using bolts, and other channel steel well rings are fixed on the positioning rails by using the positioning rails at intervals of 1 m; after the channel steel well ring is installed, lining rails are continuously installed, the rails are pulled to the underground from the ground through an auxiliary channel by a truck, the rails are unloaded into a crushing chamber, the rails are hoisted to an ore bin by a 10t steady truck, workers are matched to be in place, and the rest of the rails are installed in sequence, wherein the distance between the rails is 180 mm;

8-3) constructing steel bars;

after the basic steel bars of the crusher are bound, performing stable-mould masonry concrete operation, wherein the steel bars are bound in sequence, the frame is bound → the main steel bars are encrypted → the hooped steel bars are bound → the supporting and fixing sequence is used for continuous binding construction, binding platforms are erected along with the increase of binding height, the platforms are erected in layers by adopting frame pipes and fasteners, the height of each layer of platform is 1.2m, the platforms are firmly supported by support rods and are bound, 50mm thick wood boards are paved on the platforms, and the two ends of each wood board are firmly bound by iron wires;

8-4) stabilizing the mold;

the crusher foundation adopts a combined template for stabilizing the mold, the length of the combined template is 1.2m, the width of the combined template is 0.3m, the template is installed from bottom to top by utilizing an erected central scaffold, the template is abutted against a reinforced frame pipe and is reinforced from bottom to top at the same time, one end of a jacking support is placed in a central scaffold steel pipe, and the other end of the jacking support is supported on the reinforced template frame pipe;

8-5) pouring concrete;

after the template is stabilized, checking the template, informing a ground mixing station to mix materials after the template is qualified, transporting the materials to a crushing chamber port by using a concrete transportation tank car, installing a concrete delivery pump at the crushing chamber port, and feeding the materials to a locking port section of the ore bin by using the delivery pump for concrete pouring; when concrete is poured, symmetrically moving the pipes for pouring, and vibrating by using a vibrating rod; pumping concrete is adopted for building, the concrete is marked with a concrete label C25, and a mining concrete delivery pump is arranged at the connection position of the large member channel of the underground chamber for delivery; a centralized stirring station is built on the ground, a JS750 stirrer is adopted for stirring materials, a concrete tanker is adopted for transporting the materials to a well bottom conveying pump, and the materials are directly poured into the conveying pump for conveying.

A. Selection of type of delivery pump

Selecting an HBTS30-8-30K type mining delivery pump, wherein the parameters are as follows: the maximum horizontal conveying distance is 300 m; the maximum vertical conveying distance is 90 m; the pipe diameter of the conveying pipe is 125mm, and the conveying capacity is 30m 3/h; the maximum conveying aggregate is 40 mm; the concrete slump range is 120-160.

B. Concrete pumping process

a. Before pumping concrete, the oil quantity of the main oil pump can be adjusted to the maximum, the hopper is filled with enough water to run for 10 minutes, and whether the system pressure, the stirring device and the pumping action are normal or not is checked.

b. The pipeline is lubricated by mortar before pumping concrete, the dosage of the pipeline is 0.5m3/200m, the mixing ratio of the pipeline to the mortar is 1: 1 (sand to cement), the discharge capacity of an oil pump is adjusted to be minimum when the mortar is pumped, and after the mortar is pumped, the concrete is poured into the pipeline (the discharge capacity is adjusted to a proper position and determined according to the site).

c. When pumping concrete, the slump fluctuation of the concrete is not too large (the variation range is not more than 15%), if the slump of the concrete is too low, water cannot be directly added into the hopper for stirring, cement mortar (the water cement ratio of the cement mortar is the same as that of the concrete) is added into the stirrer for uniform stirring, and then the cement mortar is discharged into the stirring hopper.

d. And if the concrete entering the hopper has a separation phenomenon, stopping pumping, and pumping after uniformly stirring. If the aggregate is seriously separated and mortar in the hopper is seriously insufficient, removing part of the aggregate, adding the mortar and stirring again; when necessary, the concrete in the hopper and the distributing valve is completely removed.

e. The operator of the front hose should be contacted when starting or stopping pumping concrete. The bending radius of the front end hose is larger than 1 meter, so that an operator cannot stand at the discharge port of the hose, and the condition that the pipeline suddenly sprays concrete to hurt people is prevented.

f. In the concrete conveying process, the pump materials are kept above the stirring axis, so that air suction and material-free pumping are not allowed, and the concrete is prevented from flying out of the hopper at a high speed to hurt machines and nearby personnel.

g. If the pumping is suspended for a long time, the pump is started every 4-5 minutes, the pump is reversely pumped for 2-3 strokes and then is positively pumped for 2-3 strokes, so that the concrete in the pipe is prevented from bleeding and condensing. If the shutdown time exceeds 30-40 minutes (depending on the air temperature and the slump), the concrete is preferably removed from the pump and the conveying pipe, and the concrete with small slump needs to be strictly paid attention. When the pumping is interrupted and the concrete is pumped again, the reverse pump is firstly carried out to suck the concrete in the separating valve back to the hopper, and the concrete is pumped by the positive pump after being stirred.

h. In the pumping process, if the pressure of pumping is suddenly increased or the conveying pipeline vibrates, the reverse pump button is immediately turned on to reversely pump the pump for 2-3 strokes, and then the reverse pump button is turned off to continue pumping; or knocking parts which are easy to block, such as a conical pipe, a bent pipe and the like, by using a wooden hammer, if the continuous operation is carried out for a plurality of times, the pumping pressure is still too high, and the machine needs to be stopped for pipe blocking treatment.

i. The temperature of the hydraulic oil should be constantly noticed in the pumping process, when the temperature of the oil rises to 70 ℃, the machine should be stopped immediately, cooling treatment is carried out, and pumping can be continued after the temperature of the oil is reduced.

j. When the pump machine is operated, the handle is strictly prevented from extending into the hopper or the dispensing valve is grasped by hands, and the square grids on the hopper cannot be randomly removed.

k. The pressure of the hydraulic system cannot be adjusted at will, and the pressure of the energy accumulator needs to be released after the operation is finished.

And l, after concrete pumping work is finished every time, cleaning and washing the concrete remained in the cylinder, in the pipeline and on the machine frame shell.

m, equipment is required to be checked, cleaned and maintained after work, and the purposes of tidiness, cleanness, lubrication and safety are achieved.

C. Pouring concrete

The crusher foundation wall portion is irrigated in a symmetrical layered irrigation concrete mode, the layered height is 300-400 mm, the interval time of layered irrigation is not more than the initial setting time of concrete, an electric vibrating bar is adopted for fully vibrating, and the vibrating bar avoids reinforcing steel bars and templates as far as possible.

D. Form removal

In order to accelerate the construction speed and protect the built concrete, the wall formwork can be dismantled according to the actual situation on site, and when the formwork is dismantled, the reinforcing scaffold is dismantled from top to bottom, and then the formwork is dismantled.

F. Maintaining

And after the concrete is demoulded, the concrete is maintained by sprinkling water for not less than 15 days, and the concrete is maintained by sprinkling water for not less than two times per shift.

8-6) determining the excavation and caving backfill supporting form of the crusher foundation.

According to the conjecture of the rock condition difference after the ore pass is excavated, the condition of the rock foundation of the crusher is similar to that of the ore pass. The crusher has a complex foundation structure, collapse in the excavation process is inevitable, and in order to ensure the engineering quality, the backfill mode of the collapse position is agreed by relevant departments according to the investigation.

Claims (6)

1. A construction method for a foundation of an ore crusher in a 40m below slipping system engineering is characterized by comprising the following steps:

the method comprises the following steps: constructing a chute hole with the diameter of 1.4m by using a raise boring machine, and then blasting a middle-length hole for one-time well formation by multiple times to expand the chute with the diameter of 1.4m into a chute with the diameter of 3.5 m;

step two: after the draw shaft is expanded and brushed, tunneling the part of the crusher foundation more than 2.25 m; constructing a slope with the width of 2.7m and the gradient of 35 degrees as an upper and lower temporary roads of the excavator after 3m of the side line of the designed excavation section retreats from the left side of the inlet of the return air connecting channel, excavating the blasted ballast to a sliding well mouth by the excavator, then opening the excavator into the return air connecting channel from the temporary road, drilling and blasting, and loading the ballast on the sliding well mouth into a dump truck for discharging the ballast through a-40 m chute bottom;

step three: after 2.25m sections of the upper part of the crusher foundation are constructed, continuously excavating for 2.5m downwards, drilling holes by adopting a YTP-28 type rock drill, paying off by technicians when a cannon is excavated every time, ensuring section forming and controlling overbreak; digging the blasted ballast stones to a chute opening of 3.5m by using a digging machine, and then discharging the ballast stones from a-40 m ore bin ore loading chamber by using a forklift; after the slag is discharged, a reinforcing anchor rod is drilled, temporary pipe seam anchor rod support is carried out at the broken part of the rock, and concrete with the thickness of 70mm is sprayed for support;

step four: continuing to tunnel downwards after the temporary support of the crusher foundation is finished, wherein the tunneling height is 2.5m, digging the blasted ballast stones to the chute mouth by using a digging machine after mucking, and then discharging mucks from-40 m by using a forklift; and drilling a reinforcing anchor rod and temporarily spraying concrete for supporting and following to ensure the stability of surrounding rocks;

step five: when the crusher foundation is continuously excavated downwards for 2.46m and constructed to the level of-9.71 m, constructing the pipe cable joint for 4-5 m; digging the slag to the chute mouth by using an excavator, discharging the slag of the rest pipeline and cable connecting channel by using a rock raker, raking the slag to the ore bin chute under the crusher foundation by using the rock raker, and discharging the slag at-40 m by using a forklift;

step six: after the part above the level of-9.71 m of the crusher foundation and the pipe cable channel are communicated with the pipe cable raise, excavating an excavator sidewalk from top to bottom, raking the slag of the blasted slag of the excavator sidewalk by using a scraper loader, and reinforcing the side wall of the crusher foundation on one side of the sidewalk by using an anchor rod to ensure the stability of surrounding rocks;

step seven: after the crusher foundation is horizontally excavated to the proper position, adopting forward excavation, continuously constructing a lower ore bin downwards, and taking the lower ore bin construction 9m as a crusher foundation support locking port section; tunneling 2 m-3 m ore-drawing bin reinforcing anchor rods, and performing temporary concrete spraying support with the thickness of 70 mm; the blasted slag stones slide into a-40 m ore loading chamber through a ore discharging bin chute, then are discharged by a forklift, and are transported by a self-discharging car;

step eight: carrying out permanent support on the crusher foundation reinforced concrete from bottom to top;

in the eighth step, the permanent support of the crusher foundation reinforced concrete comprises the following steps:

8-1) erecting a scaffold;

8-2) installing a rail;

after a central scaffold in a basic ore bin of the crusher is erected, an ore bin lining rail is installed, a 10t stabilizing vehicle is installed in the crushing chamber to serve as lifting equipment, a lifting point is installed at the top of the crushing chamber, a processed channel steel well ring is lowered to the ore bin by using the 10t stabilizing vehicle, the well ring is fixed on an ore bin reinforcing anchor rod in place, then a 6.25 m-long rail is lowered to the position of an ore bin locking opening, the rail is manually matched in place, the central scaffold erected in the ore bin is used for fixing a positioning rail, 12 positioning rails are fixed in each circle, the rail and the channel steel are connected by using bolts, and other channel steel well rings are fixed on the positioning rails by using the positioning rails at intervals of 1 m; after the channel steel well ring is installed, lining rails are continuously installed, the rails are pulled to the underground from the ground through an auxiliary channel by a truck, the rails are unloaded into a crushing chamber, the rails are hoisted to an ore bin by a 10t steady truck, workers are matched to be in place, and the rest of the rails are installed in sequence, wherein the distance between the rails is 180 mm;

8-3) constructing steel bars;

after the basic steel bars of the crusher are bound, performing stable-mould masonry concrete operation, wherein the steel bars are bound in sequence, the frame is bound → the main steel bars are encrypted → the hooped steel bars are bound → the supporting and fixing sequence is used for continuous binding construction, binding platforms are erected along with the increase of binding height, the platforms are erected in layers by adopting frame pipes and fasteners, the height of each layer of platform is 1.2m, the platforms are firmly supported by support rods and are bound, 50mm thick wood boards are paved on the platforms, and the two ends of each wood board are firmly bound by iron wires;

8-4) stabilizing the mold;

the crusher foundation adopts a combined template for stabilizing the mold, the length of the combined template is 1.2m, the width of the combined template is 0.3m, the template is installed from bottom to top by utilizing an erected central scaffold, the template is abutted against a reinforced frame pipe and is reinforced from bottom to top at the same time, one end of a jacking support is placed in a central scaffold steel pipe, and the other end of the jacking support is supported on the reinforced template frame pipe;

8-5) pouring concrete;

after the template is stabilized, checking the template, informing a ground mixing station to mix materials after the template is qualified, transporting the materials to a crushing chamber port by using a concrete transportation tank car, installing a concrete delivery pump at the crushing chamber port, and feeding the materials to a locking port section of the ore bin by using the delivery pump for concrete pouring; when concrete is poured, symmetrically moving the pipes for pouring, and vibrating by using a vibrating rod; pumping concrete is adopted for building, the concrete is marked with a concrete label C25, and a mining concrete delivery pump is arranged at the connection position of the large member channel of the underground chamber for delivery; building a centralized stirring station on the ground, stirring the materials by adopting a JS750 stirrer, conveying the materials to a well bottom conveying pump by adopting a concrete tank truck, and directly pouring the materials into the conveying pump for conveying;

8-6) determining the excavation and caving backfill supporting form of the crusher foundation.

2. The method for constructing the foundation of the ore crusher for the below 40m chute system engineering according to the claim 1, wherein in the step 8-1), the scaffold erection sequence is as follows: tamping and leveling a foundation, paying off and positioning, putting a skid, putting a transverse floor sweeping rod, erecting a rod, longitudinally sweeping the floor, a first step transverse rod, a first step longitudinal rod, a cross brace and other rods.

3. The construction method of the ore crusher foundation of the below 40m chute system engineering according to the claim 1, characterized in that in the step 8-1), a steel pipe with phi 48 x 6m is used for erecting the scaffold, the distance between the vertical rods is 0.8m, the distance between the cross bars is 0.8m, the connectors of the vertical rods and the cross bars are provided with straight buckles, and the cross braces and the support rods are provided with movable buckles, so that the erected scaffold is ensured to be horizontal and vertical.

4. The method for constructing the foundation of the ore crusher for the below 40m chute system engineering as claimed in claim 1, wherein in the step 8-5), the conveying pump is a mining conveying pump of HBTS30-8-30K type, and the maximum horizontal conveying distance is 300 m; the maximum vertical conveying distance is 90 m; the pipe diameter of the conveying pipe is 125mm, and the conveying capacity is 30m 3/h; the maximum conveying aggregate is 40 mm; the concrete slump range is 120-160.

5. The construction method of the ore crusher foundation of the below 40m chute system engineering as claimed in claim 1, wherein in the step 8-5), the concrete pumping process is as follows:

a. before pumping concrete, adjusting the oil quantity of a main oil pump to be maximum, adding enough water into a hopper, and running for 10 minutes in an empty state, and checking whether the system pressure, a stirring device and the pumping action are normal or not;

b. the pipeline is lubricated by mortar, the dosage of the pipeline is 0.5m3/200m, the mixing ratio of the sand to the cement is 1: 1, the discharge capacity of an oil pump is adjusted to be minimum when the mortar is pumped, and the pumped concrete is poured after the mortar is pumped.

6. The construction method of the ore crusher foundation of the below 40m chute system engineering as claimed in claim 5, wherein in the step 8-5), during the concrete pumping process,

if the concrete entering the hopper has a separation phenomenon, stopping pumping, and pumping after uniformly stirring; in the concrete conveying process, the pump materials are kept above the stirring axis;

if the shutdown time exceeds 30-40 minutes, removing the concrete from the pump and the conveying pipe, when the pumping of the concrete vertically upwards is interrupted and the pumping is carried out again, firstly carrying out a reverse pump to suck the concrete in the separating valve back to the hopper, and then carrying out positive pumping after stirring;

in the pumping process, if the pressure of pumping is suddenly increased or the conveying pipeline vibrates, a reverse pump button is opened to enable the pump to reversely pump for 2-3 strokes, and then the reverse pump button is closed to enable the pumping to continue; or knocking the easy-to-block part of the conical pipe and the bent pipe by a wooden hammer, and stopping the machine to perform pipe blocking treatment if the continuous operation is carried out for a plurality of times and the pumping pressure is not returned to normal;

the temperature of the hydraulic oil is noticed in the pumping process, and when the temperature of the oil rises to 70 ℃, the machine is stopped for cooling treatment;

after the concrete pumping operation is finished every time, the concrete remained in the cylinder, in the pipeline and on the machine frame shell is cleaned and flushed.

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