This process standard applies to the wire rope hoisting method of construction hoist (steel derrick).
I. Construction Preparation
1. Materials
(1) Check the specification and quantity of various rods of steel structure, such as base frame, column, crossbar, inclined bar, top beam, etc., and the quality should be in accordance with the design requirements.
(2) Equipment and parts such as winches, wire ropes, pulleys, rope cards, connecting bolts, planter bolts, etc. must be complete and good. Outsourced parts must have a certificate of conformity, otherwise check according to the corresponding standards.
3) Tools such as wrenches, hammers, pliers, braziers, tool bags, installation booms, hemp rope, etc. should be prepared.
2, operating conditions
(1) according to the actual needs of the construction of the building and consider the traffic, drainage and construction lifts (including attached boom, spreader and its cables, etc.) and the closest distance from the overhead transmission line should not be less than the safety regulations (i.e., less than 1KV 4m, 1 ~ 10KV 6m, 35 ~ 110KV 8m), and so on issues such as determining the guide axle racks and winch Foundation position.
(2) The foundation shall be treated in accordance with the provisions of the instruction manual, and the foundation shall be able to withstand all the loads under the most unfavorable conditions at the time of operation.
(3) Lanyards or ground anchors for guide pulleys shall be provided.
(4) Prepare a good installation program and conduct a safety technical briefing to the operator.
Second, the operation process
1, the installation of the guide shaft frame
1) in the guide shaft frame base surface to install the guide shaft frame base frame, the base frame should be leveled and firmly linked with the foundation.
(2) Installation of each section of the guide shaft frame, to install the column, and then install the horizontal and diagonal contact bars and guide rails. When installed to the shelf height of 10 ~ 15m to set up a group of cable, each group shall not be less than four, one in each corner. In the future, every increase in height of 10m plus a group. Can also be in the new building structure buried bolts iron and guide shaft frame rod linkage, anchored at several intervals, anchorage point distance maximum not more than 12 m. This method, on the site is narrow, pulling the cable wind rope is difficult to be more appropriate to use.
(3) the top of the frame to install beams and pulleys. Crossbeam can be used two channel steel, composed of two pulleys mounted on top of the crossbeam, one of which is installed in the middle of the crossbeam, the other is installed in the end, so that the wire rope guillotine in the guide frame outside the guillotine through.
(4) if you need to transport long materials, can be set in the upper part of the frame boom. The bottom of the boom support fixed coupling in the column, the column on both sides of the face of the sloping rod end to point to the support part. The upper end of the boom is knotted with the steel wire rope and the frame. The upper and lower ends of the boom are equipped with pulleys. One end of the wire rope to the winch, the other end of the pulley through the mounted sling or hook suspension materials. The level angle between the boom and the horizontal line shall not be less than 45°.
(5) rail frame if in adjacent buildings, structures or other mechanical equipment on the lightning protection device outside the scope of protection (protection according to 60 °), must be installed lightning protection device, its grounding resistance shall not be greater than 30. Installation of lightning protection device residence rail frame height regulations
(6) installation of platform skipping on all floors, as well as protective doors, guards, and protective sheds.
(7) rail frame in addition to the side of the discharge, the remaining three sides should be full of hanging safety net or take bamboo shed closed.
2, the installation of the cage
1) by the angle steel, channel steel and other rods with bolts connected to the cage. The two sides of the cage were installed on both sides of the upper and lower guide wheel fence; the bottom of the cage is full of wooden boards, under the protection of φ12 iron support and steel mesh or iron plate; the top of the cage to set up a protective shed or net.
(2) Installation of floor stopping support safety device.
(3) Installation of broken wire rope protection device.
(4) Installation of protective doors.
3.Tie the guide pulley firmly to the hanging ring or ground anchor of the foundation.
4, install the winch
1) The winch is placed on the foundation of the winch, and the position of the installation should be appropriate, and the wire rope from the guiding pulley to the midpoint of the drum should be at right angles to the axis of the drum.
(2) The winch is anchored to the foundation.
1)If anchored by piling, the piles should be driven into the ground more than 1.5m deep, and should be anchored by the front top and back pulling the frame.
2)If the concrete foundation is used, the rack will be anchored with pre-embedded bolts.
5, install the wire rope
1) wire rope in the drum should be neatly arranged, the winch, no matter what the working condition, stay in the drum on the wire rope should be not less than three turns. Steel wire rope should be fixed reliably, in the state of retaining two turns, should be able to withstand 1.25 times the rated tension of the wire rope.
(2) the installation of winch wire rope, in the cross channel or many people gather to and from the place should be dug trench hidden, the bottom of the ditch to install the wheel, ditch on both sides of the brick or gate retaining the soil, the top of the pavement can be subjected to vehicle crushing of steel, wood or concrete blocks.
(3) wear around the wire rope should prevent ringing, kinking and bending; wire rope around the part of the pulley shall not have joints.
(4) wire rope and cage joints should be reliable, if the use of rope card solid connection, the number of rope card shall not be less than three, the number of rope card and spacing and the diameter of the wire rope, see table 12-4. the spacing of the rope card is not less than the diameter of the wire rope of six times. The length of the rope head from the last rope card is not less than 140mm, and the use of fine steel wire binding, rope card sliding saddle on the side of the force of the wire rope. Shall not be staggered positive and negative setting of the rope card.
6, set up a winch operating shed
1) set up both rain and can prevent falling objects winch operating shed, conditions can be made into a closed, close the door after work, to prevent others from messing with the electromechanical equipment.
7, dismantling
(1) the order of dismantling and installation in reverse order.
(2) in the process of dismantling, must be in accordance with the following requirements to remove the guide frame.
1) A cable must be installed at an appropriate location under the top cable before the top cable can be removed.
2)Remove the frame section by section from top to bottom
3)The coupling rods of the rail frame and the building must not be removed in advance, but must be synchronized with the removal of the frame.
4)The dismantling of the rail frame material should be dismantled that is unloaded, to use the rope to hang down or by the person to pass down, shall not be thrown down.
5)Unloaded material should be classified and properly stacked.
Three, quality standard
1, guarantee items
1) limit insurance device
1) cage in each layer of parking must have sensitive and reliable braking device.
2)There must be reliable cage running over height limit device.
3)There must be cage floor stopping support safety device and broken wire rope protection device.
(2) cable wind rope
1) guide rail frame installed high 10 ~ 15m, when must set up a group of cable wind rope, every increase in height of 10m add a group.
2)Cable wind rope must be more than 12mm diameter steel wire rope, prohibit the use of steel instead; cable wind rope and the angle of the horizontal line should not be greater than 45 ° in general, only in the site of the special circumstances of the narrow only allowed to increase to 60 °.
3) cable wind rope should be anchored by piling or tied in a solid building structure (not allowed to tie in the brick body). It is strictly prohibited to tie on trees, poles, transmission hitches, pipelines and scaffolding.
3) traction wire rope
1) wire installation must comply with the provisions of use.
2)Rope card installation must comply with the provisions.
3)The wire rope should be overpass protection.
4)The wire rope must not drag the ground or rub against other objects.
(4) floor unloading platform protection
1)The unloading platform springboard must be built tightly and firmly.
2)Platform must have guardrail and protective door.
(5) Cage
1)There must be a protective door.
2)There must be cage roof protection shed or net
2, allowable deviation
The installation of the full height of the rail frame with the weiwei instrument, straightedge check, the vertical deviation of the rail frame of the columns of the base level of the datum plane should be no more than the provisions of table 12─5.
Four, construction precautions
1, to avoid the quality of the project
1 rail frame is not vertical: rail frame base frame installation should be horizontal, vertical columns.
(2) the bottom frame beam is easy to be pulled to bend: guide pulley should be tied to the foundation of the hanging ring or ground anchor, not allowed to tie in the bottom frame beam.
(3) the guide frame is not stable: in the installation and removal of the guide frame should be installed in accordance with the provisions of the cable or the frame and the building coupling rods.
(4) wire rope in the drum is not neatly arranged: winch installation position to meet the requirements, the drum axis should be with the drum's midpoint to the first guide wheel direction should be vertical.
(5) all guide frame bolts, must be installed on all, not allowed to miss the installation of bolts or arbitrarily reduce the number of bolts.
2, the main safety technical measures
The diagonal bar and cross bar of the guide rail frame shall not be removed at will. If they are removed at the same time at the entrances and exits of each floor due to construction needs, tie rods or supports must be installed at the corresponding places to maintain the stability of the guide rail frame.
3, product protection
The material loaded by the cage and the material lifted by the boom must be limited to the weight according to the design capacity of the equipment, the material put in the cage should be even as far as possible, so as to make the cage run in a balanced way the material put in is not allowed to go beyond the outside of the cage, so as to prevent from falling and hurting the people, or hindering the cage from running and leading to the damage of the machine parts; the boom is not allowed to be pulled obliquely and lifted the material which is buried in the soil.
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