Safety technical measures for the construction of main shaft and tail rope replacement chamber

Section area (m2)

Design tunneling

Size (m)

Support (mm)

Anchor rod (mm)

Diverticulum

name

Excavation

basis

form

thickness

diameter

length

Spacing

Anchoring force

Titanium plate specifications

Tail rope replacement chamber

24.8

47.3

1.60

7.2

7.933

Anchor net lock spray + reinforced concrete

100+1000

20

2500

800

≥50kn

150×150×10

Fourth, the construction plan

The main well shaft tail rope replacement chamber uses the upper plate of the hanging plate for the wellbore construction as the working plate, and is driven by the top-down step method by the smooth blasting method and the anchor net spray is used as the initial support according to the design requirements, and the tail rope replacement chamber is replaced. After the overall excavation is completed and the initial support of the anchor net spray is completed according to the design requirements, the inner wall formwork is stabilized at the bottom of the working face and leveled, and the steel bars are tied for permanent wall-building, and the inner wall of the wellbore is constructed to the tail rope to replace the diverticulum. When the bottom plate is replaced, the tail rope is replaced with the bottom reinforced concrete slab. After the construction is completed, the inner wall formwork and the diverticulum formwork are integrally set up from the bottom to the top, and the overall cast-in-place reinforced concrete is permanently supported. The construction plan of the inner wall reverse mold construction is continued by replacing the permanent support section of the diverticulum with the tail rope.

Fifth, the construction method

In the construction of the main well shaft tail rope replacement chamber, the upper plate of the hanging plate for the wellbore construction is mainly used as the working plate, and the top layer is driven by the smooth blasting method. The height of each layer is 2.5m~3m. Smooth blasting method, the riprap of the tail rope replacement chamber blasting directly falls into the wellbore, and each layer is smoothed to the design size by smooth blasting to the anchorage of the top and side walls of the chamber. Protection, strengthen the closure and support of the surrounding rock of the tail rope replacement. Bolt using φ20 × 2.5m left-handed thread reinforced resin bolt, are inter row spacing 800mm; φ6.5mm network using a metal bar welded grid of reinforcing mesh 100 × 100mm; shotcrete thickness of 100mm, injection The 砼 intensity rating is C20. When the tail rope is replaced, the technicians should draw the excavation contour on the outer wall, strictly control the peripheral eye spacing and the amount of charge to ensure the integrity and stability of the outer wall are not damaged. After the main shaft and tail rope replacement chamber is completely excavated and supported according to the design requirements, the inner wall is poured on the bottom working surface to form the inner wall construction, until the tail rope is replaced with the bottom position of the chamber, and the tail rope is replaced first. After the construction of the foundation is completed, the sample is enlarged on the bottom surface of the diverting room, and the combination of the diverticulum steel and the stable diverticulum chamber is tied according to the enlarged contour of the dipper floor surface, and the steel bars in the wellbore and the inverted inner wall are molded. Formwork, and finally the entire cast-in-place reinforced concrete reinforced concrete construction from bottom to top until the permanent support section of the chamber is replaced by the tail rope.

The principle of initial support for the construction of the tail rope replacement chamber: If the surrounding rock conditions exposed during the construction of the tail rope replacement chamber are better, the construction method of one shot, one anchor net and one spray shot is adopted; if the surrounding rock condition is poor, then according to The actual situation is constructed by the guide method, and the construction method of one anchorage and one shotcrete is implemented.

1. The tail rope is replaced by a 2.4m masonry section.

(1) Digging

The height of the main shaft and tail rope replacement chamber is +657.627m (that is, the depth of the well is -680.673m), the elevation of the floor is +649.694m (that is, the depth of the well is -688.606m), the opening direction of the chamber is the south direction, and the chamber is designed as a straight wall semicircle. The arch section has a height of 7793mm (including 1333mm of anti-bottom arch) and a width of 7200mm. The design adopts anchor net spray + reinforced concrete joint support.

Attachment: Cross section of the main shaft of the well shaft to replace the digging chamber

The tail rope replacement chamber construction adopts the positive step blasting method, and the blasting adopts the smooth surface, shock absorption, weak punching and shallow hole blasting technology. Face with 6 YT-28 type pneumatic drill, using a hollow hexagonal drill Φ22 × 2200mm, Φ42mm "a" shape alloy drill, coal mine permissible emulsion explosive, electric detonators MS Delay, a parallel connection manner using a downhole 380V The power supply is detonated.

1 blasthole arrangement

The tail rope is replaced with a four-round blasthole in the whole section of the diverticulum. The sulcus is a wedge-shaped grooving method. The depth of the eye is 2000mm, the distance between the eye and the eye is 500mm, the distance between the auxiliary eye and the eye is 600mm, and the distance between the eye and the eye is 400mm. The peripheral eye is 1.8m deep and the peripheral eye contour is 100mm. Charge: 1.2Kg/eye of the eyelid, 0.8 Kg/eye of the auxiliary eye, and 0.4 Kg/eye of the peripheral eye.

Attachment: Main shaft and tail rope replacement chamber blasting chart

When the shot is opened, the peripheral eye distance is 200 mm.

The construction method of shallow eye, less charge, and split shots, layered and peeled the diverticulum section.

After the blasting, use the wind blast brush to help shape, timely put the bolts, hang the net to spray, and close.

2 In order to ensure a better light burst effect, the following points should be noted:

1. Before the construction tail rope replacement room, the quality inspector must find the center line and the floor level of the roadway according to the crosshair and elevation of the wellhead, draw the outline, and then arrange the blasthole according to the outline.

2. The spacing, angle and depth of the peripheral eye, auxiliary eye and sulcus should be strictly in accordance with the design specifications.

3. The quality inspector should select the appropriate parameters (including the spacing between the blastholes, the amount of charge and the depth, etc.) according to the specific conditions of the surrounding rock.

The tail rope replacement chamber blasthole arrangement does not include the anti-bottom arch part. After the reverse bottom arch is drilled for a certain distance, the small cannon is excavated once and the wind is trimmed to the design size.

Note: 1 day before the preparation of the construction tail rope replacement chamber, notify the freezing unit in writing, according to the construction drawings provided by us, find the position of the freezing tube in advance, and close the affected freezing tube 1 day in advance.

According to the frozen drilling layout provided by the freezing unit, the digging room is replaced in the tail rope (including the bolt support). If there is any inability to do so, it is necessary to observe the condition inside the hole in time to prevent the opening of the freezing tube and cause salt water. leakage. Before each shot, notify the freezing unit to closely monitor the change of the water level of the frozen pipe to prevent the occurrence of salt water leakage accidents.

(2) 矸

The tail stone is replaced by a blasting chamber. The meteorite is broken into the wellbore by a small excavator. It is loaded into a 5m3 bucket with two 0.6m3 center-slewing rock grabs. It is lifted to the ground by the main and auxiliary lifting winches. The artificial hook type is turned over, and the meteorite is discharged into the exhaust car through the chute, and then transported to the designated drainage site of Party A.

(3) Bolt and cable net support

In order to ensure the construction safety of the tail rope replacement chamber, the anchor cable support is added to the tail rope replacement chamber. In front of the bolt, the size of the tunneling section of the wellbore and the connecting part of the roadway must be expanded to meet the design requirements. The top and the hurdles and the floating rafts should be removed in time to ensure the safety of the construction. The anchor rod adopts Φ20×2500mmm (HRB400) left-handed rebar resin anchor, the tray adopts steel tray tray, the specification is 150×150×10mm, the spacing between anchors is 800×800mm; the anchoring agent adopts K2335, Z2360 resin anchoring agent Each branch has an anchoring force ≥50KN; the steel mesh is welded by Φ6.5mm disk round, the grid spacing is 100×100mm, the mesh size is 2000×1000mm, the upper and lower left and right lap lengths are 100mm; the anchor cable is Ф 17.8 ×7000mm steel strand, the spacing between anchors is 2400mm, staggered with anchors, anchoring force ≥100KN, each anchor cable is anchored with a K2335, two Z2360 resin anchoring agents, and the anchor cable tray is 300×300× 15mm steel tray.

Attachment: Schematic diagram of replacement of diverticulum anchor support for main shaft and tail rope

When anchoring the anchor eye, the anchor hole spacing error shall not exceed ±100 mm, the angle between the anchor eye and the rock face shall not be less than 75°, and the anchor eye depth shall match the length of the anchor, the anchor diameter and the anchor eye The diameter and the diameter of the roll must match. The drill pipe is marked according to the required depth. After the eye is cleaned, the rock powder in the eye should be cleaned by the pressure air, and the eye should be blown from the outside to the inside.

After cleaning the bolt eye, install the anchor rod, send one K2335 and one Z2360 resin anchoring agent to the fundus, then insert the resin anchor into the eye and insert it into the resin anchoring agent. The anchor bolting machine of the sleeve catches the anchor nut, and the bolting machine is driven to rotate the anchor rod body to screw it into the resin anchoring agent, and the resin anchoring agent is stirred, and the stirring rotation time is 35 seconds to 60 seconds. To stop stirring.

Remove the resin anchor nut and hang the metal mesh. The metal mesh should be crushed. The length of the overlap should not be less than 100mm. After 12 minutes of stopping, tighten the nut and tighten the bolt tray. The pull-out force of each reinforced resin anchor shall not be less than the design value. The reinforced resin anchor is followed by the working surface, and the distance between the front row and the anchor is not more than 0.5m.

After the anchor net support, the anchor cable support shall be carried out in time. The anchor cable construction shall be drilled with MQT-85J-32 anchor rod and anchor cable drilling machine . The anchor cable row spacing is 2400mm and the eye depth is 7000mm. After cleaning the anchor cable eye, the anchor cable is taken. Installation, a K2335, two Z2360 resin anchoring agent into the eye, and then use the anchor cable to push the resin anchoring agent into the fundus, start the anchor cable to drive the anchor cable to rotate the resin anchoring agent to stir the resin The anchoring agent is stirred for 35 seconds to 60 seconds. The anchor depth reaches the design depth. The anchor cable is removed. The 300×300×15mm steel tray (with 18mm hole in the middle) and the lock are placed on the lock. After 12 minutes, the MS15 is used. - 120/63 mining anchor cable tensioning device will apply the required pre-tightening force to the high-strength lock.

Note: According to the frozen drilling layout provided by the freezing unit, in the process of boring the digging room and bolting in the tail rope replacement, if there is any inability to see the situation, it is necessary to observe the condition inside the hole in time to prevent the freezing tube from being broken. , causing salt water to leak. Before each shot, notify the freezing unit to closely monitor the change of the water level of the frozen pipe to prevent the occurrence of salt water leakage accidents.

(4) Shotcrete

The spray slurry is stirred by the mixing station (dry material), transported by the loader to the discharge platform at the north side of the wellbore, and manually introduced into the 4m3 bottom discharge bucket, which is pushed by the rail to the main silo cover door, and the main hoist winch is lifted down to the bottom of the well. The iron sheet is laid at the bottom of the well as a discharge platform, and is manually fed into the shotcrete machine.

Before spraying concrete, first check the laying quality of the anchor and the metal mesh. Then connect the pressure air and water supply pipelines. The conveying pipe and the air pipe should be straight and there should be no sharp bends. The joints should be strictly prohibited from leaking air. Check whether the sprayer is in good condition. The power supply is not tested and the honing plate is fastened. Leakage phenomenon, at the same time use high pressure wind, water to wash the rock face, in the roadway vault and two gang should be set with a thick spray mark.

The thickness of the jet raft is 100mm, the mixing ratio of the jet raft is cement: sand: stone = 1:2:2, the cement is made of fresh P.O42.5 ordinary Portland cement; the sand is made of clean medium sand; the particle size of the stone is not more than 5 ~ 10mm meter stone; sneeze strength grade is C20. Concentrated mixing (dry material) on the ground by the Shiulawusu mixing station according to the ratio provided by our unit, transported to the unloading station on the north side of the wellbore by the loader, manually loaded into the 4m3 bottom unloading bucket, and lowered by the main lifting winch. To the working surface, the manual feeding to the shotcrete machine, the amount of quick-setting agent is 4% of the cement dosage. The spraying sequence is: first wall rear arch, from bottom to top, the spray gun head is perpendicular to the sprayed surface, the vertical distance between the spray head and the sprayed surface is 0.8m~1.2m, and the water-cement ratio is between 0.4~0.45. . During the spraying process, the water supply should be adjusted in time according to the change of the discharge amount to ensure the water-cement ratio is accurate. It is necessary to make the sprayed concrete have no dry spots, no runny, strong adhesion, and less rebound material. The initial spray is followed by the working surface, the initial spray thickness is not less than 50mm, and then sprayed to the design thickness.

(5) Steel banding

Before pouring the concrete, the diverticulum steel bars are tied by the center line and the waist line of the diverticulum. The vertical steel bars of the double-layer steel bars in the diverticulum are made of HRB400Φ32mm rebar, the spacing of the steel bars is designed to be 250mm, the length of the steel bars is 1120mm, and the horizontal transverse bars are HRB400Φ25mm. Rebar, the steel bar row design is 250mm, the inner layer of the steel layer is 40mm, the outer layer of the steel layer is 60mm, the connecting ribs are HRB335Φ16mm light round bar, the spacing between the bars is 500mm, and the 18# wire is used for tying. When tying, it must be tied in strict accordance with the design requirements to ensure that the thickness of the protective layer of the steel bar, the row spacing between the steel bars and the spacing between the two layers of steel bars are consistent with the design.

The steel wall of the diverticulum wall and the inner and outer walls of the wellbore are tied before the installation of the inverted formwork on the inner wall of the wellbore, and the effective connection between the rebar and the wellbore rebar is ensured. After the steel bar is tied, the formwork can be set up, and after the wall is poured, the vertical part can be tied to the arch steel bar, and the steel bar can be lowered to the third layer hanging plate of the mold construction. In order to ensure the thickness of the protective layer of the steel bar, it is possible to put a wooden board on the top of the tire board or to fix it on the top board. When the steel bars are tied, the platform should be installed. The platform should be erected firmly and fixed by the poles.

(6) stable mold, concrete pouring

The tail rope replacement chamber template adopts a steel and wood combination template. The chamber tire is processed by [20b channel steel, the processing radius is 2480mm, and one steel plate is welded at both ends of the tire. The thickness of the steel plate is 12mm. There are 4 holes drilled on the steel plate. The diameter of the hole is Φ16mm. A total of 3 pieces are machined. The tire consists of two sections of equal length, each length of 3896m. The opening of the chamber is made of wooden formwork according to the scale of the wellbore. The thickness of the template is 50mm and the width is 200mm. The length is taken according to the scene. The indoor template is made of 1200×300×50mm steel. In order to ensure the appearance after demolding, the thickness of the wooden formwork and the steel formwork must be the same.

The chamber template column and the struts are made of 150×150mm square wood. The length of the column and the struts are intercepted according to the site construction requirements.

The inner wall template of the main wellbore is recycled by 12 sets of metal-assembled formwork. Each set of templates is divided into 28 small pieces, each of which has an arc length of 1061 mm and a section height of 1.2 m. In order to facilitate the demoulding, there are 2 chamfering templates in each set of templates. A bottom ring takes root and is made of 22# channel steel.

Before the tail rope is replaced in the chamber, the position of the inverted metal fitting template is corrected, and the two molds are continuously stabilized. Then the wall column and the wall tire plate are erected. Before the wall column is stabilized, the middle and waist lines of the chamber must be Correction, then hang up the center line of the diverticulum, waistline and wellbore to determine the position of the wall column, and put the bolt to fix the wall column in the corresponding wall. After all the wall columns are stable, use the horizontal tube and the steel ruler to correct the error. The struts between the wall columns must be fixed firmly and tightened with wire. After stabilizing the wall column, fix the wall wooden tire board with nails, and then nail the wooden wedges to support the wooden struts. The wooden struts are erected on the wooden struts to facilitate the construction of the personnel. After the tire plates are supported, the small support is used on the wall. The rod secures the tire plate and corrects the casting radius. The tire plate should be smoothed before use, and the two ends should be blocked to prevent running. After the initial concrete of the wall is stabilized, the template of the arch of the chamber is stabilized, and the template of the wellbore is stabilized, and the concrete is poured until the permanent support section of the chamber is replaced by the tail rope.

The concrete is supplied by the Shilususu mixing station, and the commercial vehicle is transported to the unloading station on the north side of the main wellhead. It is cut by the 4m3 bottom unloading bucket and is lowered by the main lifting winch to the bell mouth fixed on the main upper plating tray. In the ash separator, four 8' steel wire armored wear-resistant hoses are symmetrically slipped into the mold.

The parameters of concrete must meet the design strength requirements to ensure uniform concrete, no segregation, no delamination, and the discharge is clean, convenient and can meet the needs of construction. Each class should check the concrete slump and the mold temperature, and the mold temperature should not be less than 15 °C.

The concrete should be placed in layers, symmetrically and evenly into the mold. The thickness of each layer should not exceed 300mm. The concrete should be tamped with a plug-in high-frequency vibrator. The vibrator should be no less than 5 sets. The vibrator should be equipped with a special person to dispose of the film. The vibrating rod is inserted into the lower concrete 50-100mm, each movement is 300-400mm, and the quick-insertion is slow-drawn. The concrete surface is basically level, and mortar and bubble are not suitable. Remove the wooden struts in time according to the height of the rafting.

Concrete pouring should be carried out continuously, the gap time should not exceed the initial setting time. After more than 1 hour, the surface residue should be removed first, and the surface should be cut into a rough surface with a wind chime. Rinse with water, lay a layer of concrete with half of the aggregate, and then use the original The concrete is poured in proportion to the concrete.

When pouring concrete, the ash should be symmetrical and uniform. The wellbore should be poured first, and after pouring a certain height, the tail rope should be poured to replace the wall on both sides of the chamber. After the pouring is completed and the solidification is completed, the two-die mold template is stabilized and the abutment of the arch is stabilized. When standing upright, hang the center line and correct the position, then level it with a horizontal tube. The tires should be fixed with small struts to prevent the running mold. The struts between the tires should be firmly connected.

(7) demoulding

The demolished formwork is removed on the four-layer disc of the hanging plate. The tail rope is replaced. The indoor formwork is removed after the inner wall of the set is finished. The upper plate of the hanging plate is used as the working platform. When the inner wall of the arch is removed, the rear part of the arch is removed and removed. The template and abortion are raised in time, and the full-time safety inspector is responsible for checking the bundling situation before the well is raised. For demolishing personnel, the insurance belt must be rooted, and the removed templates and other items should be firmly grasped to prevent falling and hurting people.

2. The remaining 5.6m section of the tail rope replacement chamber is constructed

The remaining 5.6m excavation, exit rafting, bolt support, anchor cable support, shotcrete, paving, steel bar tying, and stable mold are all constructed according to the method of replacing the opening section of the chamber with a tail rope. Stabilize the formwork and pay attention to the 2.4m to be poured first, and the length of the crushing is not less than 200mm to ensure the tight connection between the post-casting and the pre-construction.

(1) Concrete pouring

The 5.6m concrete construction of the remaining part of the tail rope replacement chamber is carried out by two castings, the first stable standing 3.6m, and the second stable standing pouring 2m.

The concrete is supplied by the Shiulasu mixing station, and the commercial vehicle is transported to the unloading station on the north side of the main well. The 4m3 bottom unloading bucket is used for feeding, and the iron is laid on the bottom of the wellbore, discharged onto the iron sheet, manually introduced, and concrete is conveyed. The pump (wind pressure tank), the concrete discharge pipe enters the interior of the formwork, first the rear part of the wall.

The concrete should be placed in layers, symmetrically and evenly into the mold. The thickness of each layer should not exceed 300mm. The concrete should be tamped with a plug-in high-frequency vibrator. The vibrator should be no less than 5 sets. The vibrator should be equipped with a special person to dispose of the film. The vibrating rod is inserted into the lower concrete 50-100mm, each movement is 300-400mm, and the quick-insertion is slow-drawn. The concrete surface is basically level, and mortar and bubble are not suitable. Remove the wooden struts in time according to the height of the rafting.

Concrete pouring should be carried out continuously, the gap time should not exceed the initial setting time. After more than 1 hour, the surface residue should be removed first, and the surface should be cut into a rough surface with a wind chime. Rinse with water, lay a layer of concrete with half of the aggregate, and then use the original The concrete is poured in proportion to the concrete.

(2) demoulding

The 5.6m concrete construction of the remaining part of the tail rope replacement chamber is divided into two times. The first time is 3.6m, and the second stable is 2m. After the concrete has set, the formwork is removed using a construction platform that is firmly anchored. First, the rear part of the arch part, the arch part first removes the abortion, when the abortion is removed, the hemp rope is tied in the direction of the dumping of the abortion, and the artificial rope is pulled to prevent the abortion from suddenly falling and injuring during the dismantling process. After the tire is removed, the coffin is removed from the interface between the arch and the wall using a crowbar. When removing the arched tire plate, no one is allowed under the template to prevent the tire plate from falling off and hurting people. After the removal of the arch tire plate, the construction platform is removed, the wall is removed, and the wall tire plate is removed according to the method of removing the arch tire plate.

The removed tire plates and abortions should be cleaned and oiled in time for the next use. After demoulding, use the inner wall to construct the sprinkler pipe on the fourth layer of the hanging plate to maintain the concrete in the diverticulum.

6. Labor organization arrangements and construction schedules are expected

1. Labor organization arrangements

During the construction of the main shaft and the tail rope replacement chamber, the direct underground work and the ground support workers all adopt the “three-eight system” operation. For details, please refer to the labor allocation table for the construction of the main shaft and the tail rope replacement chamber.

2. Construction period is expected

The construction period of the main wellbore tail rope replacement 3.5m section of the permanent support construction is expected to be 10 days (including pouring concrete time), and the construction period of the remaining 5.6m section of the tail rope replacement chamber is estimated to be 20 days.

If an emergency situation is encountered in the underground, the well can be raised in the following manner: The operator immediately rides the bucket and raises the well through the up and down signals.

(1) Head-on → Bucket → Ground

(2) hanging plate → safety ladder → ground

Eight, other

For other details, please refer to the “Safety Technical Measures for the Construction of the Main Shaft Rope Replacement Chamber in Shilawusu Mine”.

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