Station Subject Foundation Pit Engineering Essay

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Temporary support construction technology. 1.1 Scope .This specification the segmented production siding, outer plate the material positioning support construction requirements. This specification applies to the production of steel structure Division All kinds of new segments of the ship. 2 commonly used support materials Angle 100 - 100 150 - 150 20 # 3 process requirements

3.1 rib plate girders supporting the 3.1.1 2 m below the rib plate girders with 100 - 100 angle iron support: support points in the rib plate girders channel / 4 height positions; support angles ground angle control about 60 °; support span: 3-4 meters support an angle iron; rib plate girders the foot positioning sided welding symmetrically distributed according to the length of the center of the board; length of more than 200mm, the interval 1000mm; 3.1.2 2 meters above the rib plate girders with 20 # channel support: support points in the rib plate girders 3/4 height positions; support the angles ground perspective control about 60 °; support span: 3-4 meters support an angle iron; symmetrical distribution based on the length of the center of the plate; the rib plate girders foot positioning sided welding length greater than 200mm, the interval 1000mm; the 3.2 bulkhead supporting bulkheads must 20 # channel support: 3/4 height position of the non-structural surface support points in the bulkhead, the strong point try at the strong structural; support angles ground angle control in about 60 °; support span: 3-4 meters per support a 20 # channel, based on the length of the center of the siding symmetrical distribution; according to the actual situation may be appropriate to increase the support; the bulkhead foot positioning sided welding length greater than 200mm, the interval 1000mm; the 3.3 outer panel support segmented external boards are the leaflets scattered paste applied work following requirements: 3.3.1 outer panel and ground into a 60 ° angle below: the outer panel and the internal structure must be used to pull the pounds or card code fixed 4:00, 3/4 the height of 2:00 , 1/4 the height of 2:00; 3.3.2 outer plate with the ground must be more than the angle of 60 ° with 20 # channel supported: the height position of the support points of the outer plate 3/4, support points is possible at the reinforcing structure. The support angles with the ground an angle control at about 60 °;

Figure

2 Construction Organization

2.1 Project Department site management network

Project Manager

deputy project manager

project engineer

Construction group

Material equipment group

technology group

Material equipment member

documenter

Quality member

safety officer

construction worker

2.2Construction organization and personnel

type of work

Quantity (people)

Note: in the middle of September

night after construction permits

engineer

1

section chief

1

ironworker

12

Increase blacksmith eight people

woodworking

ï¼’

Increase woodworking four people

electric welder

ï¼’

3. Construction process photo:

Preparation for construction

Survey and setting out

Support bracket installation

Tilting pad boxes ready

Support the top gap bolt fill

Support pipe installation

Construction of prestressed

Install the hold box

Inspection and axial force complex plus

Dismantled

3.1 Station main pit set up three steel support, an inverted stays. The first steel support set in the crown beam, three steel support set in steel Wai purlin on, pour stays set embedded plate position in the structure of the side walls. The steel support Specifications for ¢ 609 - 16 steel pipe, steel circumference the purlin as Larry 45c I-beam. Steel support construction of the installation process, should be strictly controlled the good steel support installation elevation. 5.1.1 support material prepared according to Foundation Pit Support Structure drawing size, according to the plan the amount of an ample supply of various lengths Φ609 t = 16 steel support tube, active head and steel pad box, angle, channel, steel pads, steel The wedge, fastening bolts, iron and other supporting material, classified piled in the stockyard. Various materials must be approved by the quality inspection before entering the construction schedule in batches, to ensure that the approach supporting materials to meet the design requirements and construction schedule requirements. Computed prestress values ​​per channel support.

3.2 crane ready preselection 50T crawler crane car, according to the actual requirements, check the ability to meet the requirements. The crane style shown in Figure:

3.3 steel Wai purlin lifting parameters to check the pit width of 24 meters, the pit edge width of 3 meters

can not stop the crane, the crane in the range of about 27 meters, the crane working angle of 30 ° -80 °, so the length of the crane's boom is at least 32 meters, select boom length of 37 meters, with reference to the technical parameters, in the case of boom 37 meters working radius of 28 meters, lifting weight is 2.1T. Wai purlin installation 6 m steel weight is 2 tons, 50 ton crane installed opposite steel Wai purlin can. 4 steel support lifting the parameter checking links beams about 15 meters away from the crane position, without active end section is supported in the 12 meters and a weight of 4 tons. Since the support installation is used in the bottom of the pit two docking method, first a support 50T crane hanging on the bottom of the pit, and then in the opposite 25T crane mating mounting. Boom at 37 meters working radius of 16 meters, with reference to the technical parameters, this situation 50T crane lifting 4.6T, 50T crane hoisting a support. The foregoing analysis 50T crawler crane 25T crane car with the steel support to meet the installation requirements. 5.1.3 According to the positioning station design drawings and field measured with a steel ruler on both sides of the ring beam position measurements per channel support of the center of the mounting plane and ring beam entry surface elevation, composite correct with red paint to mark. Construction, soil surface elevation and support center by the ring beam entry surface elevation using a hammer and steel ruler vertical measurement. 5.1.4 support material stitching ready assembled alternate earth excavation progress and advance the assembled field support number and Design length. Support pre-construction, should be prepared in advance of even the tie beam; construction bracing ready bearings (steel pad box) while cutting the the steel corbels material ready in time to install once the face out.

3.4 support installation sequence first steel support - → Road steel support - → Road steel support - →'d support 5.1.7 installation method works excavation support length 24m, beam intermediate link sake Therefore, in principle, two hanging into the pit to install installation to measure support installation center position, subsequently bracket according to the size of the positioning of the bracket (steel corbel) elevation and mounting bracket, then lifting steel Wai purlin placed in the bracket, and secure the last will support installation in steel Wai purlin on applied axial force. Pit set an even tie beam, it should be installed in the lattice column even tie beam steel support in a support surface in two assembled, the first band active head hanging into pit initially design elevation, placed circumference in steel purlins

Department of steel rod, and will be with an active head hanging into the pit the two support splicing in the bottom of the pit; finally required to install the support in the design of the center position, applied axial force and plus welding hoop, complete the Root support installation. The first steel support installed: in the the crown beam intensity reached more than 80% of earth excavation support face out in accordance with the design elevation welded steel corbel and even tie beam, measuring the length between both sides of the crown beam , and based on the actual amount of length adjustment has assembled a good supporting length. The installation location marked with a red steel support beam in accordance with the design and installation of the horizontal position of the top pressure. Support position, length correct by reinspection by a 50T crawler crane car with a 25T truck crane erected steel support prestressed design requirements in a timely manner, and finally links beams plus welding a hoop. Each time the channel support requirements installed within 8 hours. Secondary steel support installed: When the support face out in accordance with the design elevation welded steel corbel and even the tie beam, and the mounting bracket on the pile and erection of steel Wai purlin purlin steel Wai installed immediately DD on both sides The actual distance between the steel Wai purlin and adjust the length of splicing has good support. The support installation elevation, length by reinspection correct hoop by a 50T crawler crane car with a 25T truck crane erected steel support prestressed design requirements in a timely manner, the final welding a beam plus links hold. Each time the channel support requirements installed within 8 hours. The second Road bracing drawing size should first install the tilting pad box. The third support installation: the installation of the construction sequence and the second support. Pour stays installed after the structure side wall strength to meet the requirements, in accordance with the design elevation and horizontal position carved embedded steel and welded steel corbel, installation the steel corbel and even tie beam the post. The support installation elevation, length by reinspection correct hoop by a 50T crawler crane car with a 25T truck crane erected steel support prestressed design requirements in a timely manner, the final welding a beam plus links hold.

3.5 linked girder installation each excavation after, the first column should Trellis Steel Corbel installation elevation calculated in accordance with the support center, then 50T crane will have stitching good linked the beam erection of latticed column then connect the beam is welded firmly laced columns. Another with an even tie beam junction, the junction of two connecting plates welded firmly.

  3.6 Support Removing 1 steel support dismantling step after the base plate to meet the design strength steel supports removal of the third to retain secondary steel support pouring the next layer of the side wall to the second steel support can be removed to be reached intensity secondary steel support and down to support the side walls and in the board, and then continue up pouring after removal of the first to be reached strength steel support. Such as the formation of the side walls, columns, pilasters, frame, beam force system, dismantling stays down.

 Support Removing jack to release the active support and then hanging out pit, and then remove the linkage beam, and timely support will all removed material disintegration shipment played.

4.Conclusion

Temporary support construction technology, according to the construction standards strict requirements, testimonies, and according to the construction to be safe, save construction time, quality Attorney.

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