CN103758564A - Method for suspending monorail crane in soft and weak coal seam roadway - Google Patents

Abstract

The invention discloses a method for suspending a monorail crane in a weak coal seam roadway. By controlling factors such as the length of the anchor cable of the suspension monorail crane, the anchoring section of the drug roll, the tension and pretension force of the anchor cable installation, and adopting an autocratic anchor cable hole wall Technical methods such as protective sleeves have effectively improved the safety and reliability of monorail crane suspension in weak and thick coal seams. The monorail crane suspension and roadway support form a reasonable interaction system to achieve the hydraulic pressure The purpose of heavy-duty equipment such as brackets is to avoid accidents caused by unreasonable suspension force of monorail cranes, and to ensure convenient installation and construction and safe suspension and transportation of monorail cranes. Compared with the existing monorail suspension method, by controlling the reasonable length of the suspension anchor cable and its anchorage section, the entire suspension force structure is improved, the suspension bearing capacity is effectively improved, and the scientific and efficient operation in the underground weak coal seam roadway is achieved. The purpose of safe and convenient suspension monorail crane.

Description

A method of suspending monorail crane in weak coal seam roadway

technical field

The invention relates to the field of coal mine roadway auxiliary transportation, in particular to a method suitable for suspending a monorail crane in a weak coal seam roadway.

Background technique

Underground roadway suspension monorail cranes generally use the suspension bolts/cables anchored in the coal and rock mass as the intermediary of load transfer, and through the interaction of the monorail suspension rod body, roadway surrounding rock and roadway support system, the appropriate selection of The unique monorail suspension method has guiding significance. The effective support of the roadway is the foundation, and the anchor rod/cable and resin anchoring agent are closely bonded to the stable coal and rock formation, and then the lock (nut) is pre-tightened to form a suspension structure. The effective design and construction of this suspension structure is the guarantee of the project.

Delamination deformation of the roof coal rock leads to structural instability, which in turn adversely affects the anchorage section of the suspension rod. In the force system of the anchor rod/cable suspension monorail crane, it is worth clarifying whether the anchor rod/cable of the suspension monorail crane is used as a part of the roadway support function, or only as the bearing body of the suspension monorail crane. The effect of the anchor rod/cable of the suspended monorail crane on the roadway support system needs to be analyzed and judged according to the anchorage length and position of the drug coil of the suspension rod body, the installation pre-tightening force and other conditions. Generally speaking, the roadway support design and layout of the suspended monorail crane is reasonable, and the strength is sufficient to effectively control the deformation of the surrounding rock, so that it is an ideal state for the suspended anchor rod/cable to only be used as the carrier of the monorail crane. The suspension rod body is anchored on the stable rock formation above the weak coal seam. The rod body bears the monorail suspension load through the anchoring effect of the resin roll and the rock formation. The suspension load is finally borne by the roadway anchor net cable support system. The anchor cable of the suspended monorail crane does not undertake the support function of the roadway, and through the joint action system formed by the roadway support and surrounding rock, the suspension transport load of the monorail crane is indirectly borne by the entire support structure system. In order to achieve the above ideal state, it is necessary to reasonably control the position of the anchorage section of the rod body in the surrounding rock of the roadway and the installation preload of the suspension plate under the condition of ensuring that the roadway anchor network cable support layout is reasonable and has sufficient support strength. Insufficient pre-tightening force will easily cause the lower part of the rod body to be subject to tangential force, which will cause a large lateral swing of the rod body, and there is no external force in the middle of the anchor rod. In this case, it is necessary to lengthen the anchorage section and take effective measures to reduce the lateral swing of the rod body, otherwise During the operation of the monorail locomotive, it will continue to shake the suspension anchor rod/cable, which is very unfavorable to the anchorage section of the anchor cable.

Especially in the all-coal roadway, the monorail crane is used to assist transportation. The weak coal seam on the roof brings a series of technical difficulties to the suspension installation. The limited installation length of the anchor suspension monorail crane cannot anchor the anchor rod above the coal seam. Stabilizing the rock formation cannot guarantee the safe operation of heavy-duty equipment such as suspended monorail cranes for transporting hydraulic supports; the method of using general anchor cables to suspend monorail cranes is difficult to construct, and the installation efficiency is low and there are even problems such as waste of materials. In order to solve the above technical problems, the present invention has developed a method of anchor cable suspension monorail crane that fully utilizes the interaction of the roadway surrounding rock support system and is convenient for construction. The monorail suspension is safe and reliable, convenient for installation and construction, and has remarkable economic and social benefits. The method can also be applied to the suspension and heavy-load operation of rail cranes in broken roofs and weak surrounding rocks in mine roadways or tunnel engineering. A method for suspending a monorail crane in a coal roadway where the roof of the roadway is a thick coal seam (≥2.5m) and the coal body cracks are developed and the strength is low.

Contents of the invention

Technical problem: The purpose of this invention is to overcome the deficiencies in the prior art and provide a method for suspending monorail cranes in weak coal seam roadways with simple method, convenient operation and high safety.

Technical solution: The weak coal seam roadway monorail suspension method of the present invention comprises the following steps:

(1) After the bolt/cable support is carried out for the weak coal seam coal roadway, the lifting point position of the suspended monorail crane is determined on the roadway roof, and the leveling treatment is carried out;

(2) At the lifting point of the monorail crane, drill the monorail crane suspension drilling holes vertically in pairs according to the long distance of the monorail suspension section. The diameter of the drilling hole is 28mm, and the drilling depth passes through the weak coal seam and enters the stable rock formation 1 -2m, the distance between the two monorail suspension drilling holes drilled upwards in pairs is 250-350mm;

(3) After clearing the hole, feed the resin coils with different solidification times into the two boreholes, then insert the anchor cable into the borehole until the bottom of the hole, and stir the resin coils in the drilled holes for anchoring. Segment length > 1.5m;

(4) After the drug roll is solidified, put the anchor cable hole wall protection sleeve on the anchor cable into the two drill holes;

(5) Install suspension pallets and anchor cable locks on the anchor cables of the two exposed sections, and pre-tension the two anchor cables, and the tension pre-tension force is ≥ 80kN;

(6) Install the suspension chain in the middle of each suspension pallet in turn, and hang the monorail through the suspension chain to complete the suspension of the monorail crane walking track.

The length of the anchor cable is determined according to the thickness of the roof of the roadway and the coal seam according to the calculation of exceeding the thickness of the roof by 1.5m;

The anchor cable hole wall protection sleeve is made of PVC pipe, the anchor cable hole wall protection sleeve has a groove along the axial direction, the outer diameter of the anchor cable hole wall protection sleeve is 32mm, the pipe wall thickness is 3.5mm, and the length is 600mm, and the groove width is 14mm;

The suspension pallet is provided with through-holes with the same width as the distance between the two anchor cables, and a fixing block for installing a suspension chain is provided between the two through-holes at the lower end of the suspension pallet;

The optimal spacing of the two monorail suspension drilling holes is 300mm.

Beneficial effects: the present invention adopts the method of lengthening the anchor cable of suitable length and combining the hole wall protection sleeve and suspending the supporting plate member, which is suitable for suspending the monorail crane under the condition that the coal seam on the roof of the coal mine underground roadway is thick and the coal body is weak and broken. It can effectively solve the problems of suspension safety, cumbersome installation and construction and high suspension cost of heavy-duty equipment transported by monorail cranes, and ensure safe, fast, economical and practical suspension construction of monorail cranes. The anchor cable hole wall protection sleeve with a groove is used to plug it into the anchor cable drill hole with a diameter of 28mm, which can produce a fastening force on the anchor cable, which solves the problem of fixing the suspension anchor cable at the top of the coal roadway. The unanchored section of the anchor cable swings slightly in the hole, causing the weak coal hole to swell and collapse, which affects the firmness of the suspension anchor cable. The use of this high-strength special protective sleeve can reduce the vibration fatigue on the anchoring end of the suspension anchor cable, and can effectively protect the drilling hole of the anchor cable. Through laboratory tests and theoretical calculations, it is best to use anchor cables with a spacing of 300mm to suspend the supporting plate for monorail suspension, and install the suspension chain under the supporting plate to suspend the track required for the operation of the monorail crane, and use the supporting plate to indirectly suspend the monorail The suspension can make the two suspension anchor cables evenly and cooperatively bear the suspension load; the distance between the two anchor cables is larger than that of the general anchor suspension design. This design can reduce the interference of construction and give full play to the suspension of the two anchor cables. Hanging effect. Compared with the prior art, it has the following advantages:

(1) Reasonably select the length of the suspension anchor cable to save the amount of the anchor cable, control the position of the anchorage section, optimize the suspension bearing force of the anchor cable, make full use of the joint action of the roadway surrounding rock and support, and improve the performance of the suspension monorail crane for transporting heavy loads. safety;

(2) By inventing the use of high-strength special protective sleeves, the effect of full-length anchoring of the bolt/cable is achieved, and complicated construction techniques such as grouting are avoided, the labor intensity of underground workers is greatly reduced, and construction materials are saved; construction increased speed;

(3) Optimize the distance between the two holes of the anchor cable suspension supporting plate, improve the force of the suspension structure, and improve the reliability and bearing capacity of the anchor cable suspension.

Description of drawings

Fig. 1 Layout of roadway cross-section of anchor cable suspension monorail crane.

Fig. 2 Partial enlarged view of suspension anchor cable, supporting plate and sleeve.

Figure 3 is the side view of the anchor cable suspension monorail crane.

In the figure: 1-roadway roof, 2-weak coal seam, 3-stable rock formation, 4-suspended anchor cable, 5-protective sleeve for anchor cable hole wall, 6-anchor cable resin coil anchoring section, 7-suspension support Plate, 8-anchor cable lock, 9-steel spacer, 10-hanging chain, 11-monorail crane walking track, 12-monorail crane locomotive.

Detailed ways

An embodiment of the present invention is described in further detail below in conjunction with accompanying drawing:

The weak coal seam roadway monorail suspension method of the present invention, concrete steps are as follows:

(1) Carry out anchor net cable support for the roadway. After the anchor rod/cable support is carried out for the coal roadway in the weak coal seam 2, determine the lifting point position of the suspended monorail crane on the roadway roof 1, and perform leveling treatment;

(2) Drill the monorail suspension suspension drilling holes vertically upwards in pairs according to the long distance between the monorail suspension sections at the suspension points of the suspension monorail suspension. The diameter of the drilling holes is 28mm, and the drilling depth is determined according to the actual roof coal seam thickness of the roadway. The drilling depth should exceed the weak coal seam 2 and reach the upper stable rock formation 3, and the drilling depth should pass through the weak coal seam and enter the stable rock formation for 1-2m. 250-350mm; the optimal distance between two monorail suspension drilling holes is 300mm;

(3) After clearing the holes, feed resin medicine rolls with different solidification times into the two boreholes, put one CK2360 and two Z2360 specification resin medicine rolls into the drill holes in turn, and then put the diameter 17.8mm, length Insert the top of the suspension anchor cable 4 adapted to the depth of the borehole into the borehole and stir together with the resin drug coil in the drill hole for 15 seconds. The anchoring section 6 of the anchor cable resin drug coil should have a length greater than 1.5m, so that the entire Most of the anchoring section is in the stable rock formation 3; the length of the anchor cable is calculated according to the thickness of the roadway roof and the coal seam according to the calculation of 1.5m beyond the thickness of the roof to ensure that the anchoring section of the anchor cable is partly in the stable rock formation 3 above the weak coal seam 2, and control The pre-tightening force of the anchor cable installation should not exceed the pre-tightening force of the roadway support anchor cable. The load of the suspension monorail crane passes through the anchoring effect of the resin roll and the rock formation, and the rock formation interacts with the existing anchor net cable support system of the roadway. To bear the action force, the anchor cable of the suspended monorail crane does not directly bear the support function of the roadway, but forms a joint action system with the roadway anchor net cable support, so that the monorail crane suspension transport load is indirectly borne by the entire support structure ;

(4) After the drug coil is solidified, put the anchor cable hole wall protection sleeve 5 on the anchor cable into the two drill holes, that is, the anchor cable hole wall protection sleeve 5 is inserted into the anchor cable and inserted into the drill hole , the sleeve squeezes into the borehole and has a certain stability, effectively controlling the shear swing of the anchor cable under the vibration of the transport load; the anchor cable hole wall protection sleeve is made of PVC pipe, and the anchor cable hole wall protection sleeve is along the There is a groove in the axial direction, the outer diameter of the anchor cable hole wall protection sleeve is 32mm, the pipe wall thickness is 3.5mm, the length is 600mm, and the width of the groove is 14mm; plug the pipe with the groove into the anchor with a diameter of 28mm In the drill hole of the anchor cable, it can produce a fastening force on the anchor cable. The use of this high-strength special protective sleeve can reduce the vibration fatigue on the anchor end of the suspension anchor cable and effectively protect the anchor cable drill hole. mouth;

(5) Install the suspension supporting plate 7 and the anchor cable lock 8 on the anchor cables of the two exposed sections, perform pretension tension on the two anchor cables, and insert the two anchor cable holes of the suspension supporting plate 7 into the installation For the exposed end of a good anchor cable, pad the spring washer 9 and lock it with the anchor cable lock 8, the tension pre-tightening force is ≥ 80kN; after the lock is locked, cut off the exposed part of the anchor cable so as not to affect the installation of the monorail crane track 11 ; The suspension pallet is provided with a through hole with the same width as the distance between the two anchor cables, and a fixing block for installing a suspension chain is arranged between the two through holes at the lower end of the suspension pallet;

(6) According to the length of the monorail crane track 11, install the suspension chain 10 in the middle of each suspension pallet in turn, and hang the monorail through the suspension chain 10 to complete the suspension of the monorail crane walking track 11, and the monorail crane locomotive 12 walks on the track above.

Claims (5)

1. a rockburst tunnel mono-rail hoister suspention method, is characterized in that comprising the steps:

(1) rockburst coal road being carried out to, after the supporting of anchor pole/rope, determine at back the hoisting point position that suspended single-track hangs, flatten processing;

(2) at the hoisting point position place of hanging monorail crane, by monorail crane segment length spacing, play vertically upward in pairs monorail crane suspention boring, the diameter of boring is 28mm, boring is dark to enter and stablizes 1-2m in rock stratum through rockburst, and the spacing of two monorail crane suspention borings of upwards beating is in pairs 250-350mm;

(3) behind clear hole, in two borings, send into the resin explosive roll that setting time length is different, then anchor cable is inserted in boring until at the bottom of hole, the resin explosive roll in boring is stirred and carries out anchoring, anchoring section length > 1.5m;

(4) after powder stick solidifies, to the anchor cable hole wall protection sleeve being enclosed within on anchor cable that packs in two borings;

(5) suspention supporting plate and anchor cable lock are installed on the anchor cable of two revealed sections, two anchor cables are carried out to pretightning force stretch-draw, stretch-draw pretightning force >=80kN;

(6) at each suspention supporting plate middle part, chain sling is installed successively, by chain sling, is hung single track, complete the suspention of monorail crane walking track.

2. rockburst tunnel mono-rail hoister suspention method according to claim 1, is characterized in that: described anchor cable length according to the thickness in back and coal seam according to exceeding top plate thickness 1.5m calculative determination.

3. rockburst tunnel mono-rail hoister suspention method according to claim 1; it is characterized in that: described anchor cable hole wall protection sleeve pvc pipe is made; anchor cable hole wall protection sleeve has slot vertically, and the external diameter of anchor cable hole wall protection sleeve is that 32mm, thickness of pipe wall 3.5mm, length are that 600mm, slot width are 14mm.

4. rockburst tunnel mono-rail hoister suspention method according to claim 1, is characterized in that: on described suspention supporting plate, have with two anchor cable spacing with wide open-work, between two open-works of suspention supporting plate lower end, be provided with the fixed block that chain sling is installed.

5. rockburst tunnel mono-rail hoister suspention method according to claim 1, is characterized in that: the optimal spacing of two described monorail crane suspention borings is 300mm.

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