Bascule Bridge Design and Construction

“DOUBLE LEAF BASCULE BRIDGE”

1. OBJECTIVES:

  • Behove spiritless with the grove exercise.
  • Behove spiritless with lathe utensil and punishment utensil.
  • Build a uncompounded pulley.

2. INTRODUCTION:

A bascule bridge (habitually referred to as a drawbridge) is a changeable bridge with a counterweight that unintermittently poises a couple, or “leaf,” throughquenched its upward wave to yield clearance coercion boat commerce. It may be sole or embrace leafed.

3. METHOD:

  • Chop quenched an arch with the scroll maxim from the 5-by-7-by-2-inch obstruct of decline grove. Make the arch abquenched 3 inches distant and 4 inches elevated. Be indisputable to chop in the longest bearing, so that the foot of the arch behoves the foot of the rise, and there is 3 inches left aggravate the culmination of the arch.
  • Meaindisputable and sign with the pencil whole 1/2 inch aggravate the culmination of the rise, aggravate the arch. At whole other sign, chop a cavity 1/2 inch recondite and 1/2 inch distant with the scroll maxim. These are the rise battlements.
  • Disaspect the rise on the 5-by-10-by-1/2-inch obstruct and nail the two pieces concomitantly through the foot to coercionm the rise corrupt.
  • Lay down the two 4-by-1/2-by-1/2-inch obstructs concurrent to each other 3 inches detached on your exercise exterior.
  • Lay the eight 4-by-1/2-by-1/8-inch strips aggravate the two obstructs. Attach the strips to the obstructs with finishing nails. This is your drawbridge.
  • Turn aggravate the drawbridge and tap in two finishing nails, individual into each obstruct, as arrest to the objects as you can withquenched splitting the grove. Liberty the nails sticking quenched late the edges of the drawbridge, abquenched 1/4 inch. This conciliate be the pivot object of your exhibitation.
  • Tap in two gone-by finishing nails, individual into each obstruct, abquenched 1/2 inch from the object contradictory the pivot object of the drawbridge. Liberty the nails sticking late the edges abquenched 1/4 inch.
  • Lay the drawbridge, obstruct verge down, on the rise corrupt in front of the rise. Locate an upholstery article aggravate the protruding nails on the pivot object and gently tap the articles into the rise corrupt. This should withwithdpolite the drawbridge in locate conjuncture permiting it to depobject freely into disunavailable and bar poses. Adjust the articles and nails if needed.
  • Tap two finishing nails into the rise, individual on either verge at the culmination of the arch. Make indisputable they are spaced 4 inches detached, as distant as the drawbridge. Angle the nails at abquenched 45 degrees, and liberty half of each nail sticking up.
  • Attach individual object of each retain to the nails at the culmination of the arch. Attach the other objects to the drawbridge.
  • Stain the grove with the paintbrush, then permit to barren.

4. DISCUSSION:

  • SAMPLE DIAGRAM:

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  • TERMS AND EXPLANATION:

PRACTICAL INFORMATION ABOUT BASCULE BRIDGES:

Almost perfect embrace leaf bascule bridges stop of two cantilever couples adapted internal each other, alike at their tips by a competent scrape lock. Other archetypes of embrace leaf bascule are comparatively noble, such as those which coercionm arch bridges in the arrestd pose, and are referable the culminationic of this argument.

Embrace leaf bascule bridges are haply the lowest skilled, from a defence and exercise standpoint, of perfect habitually verificationd archetypes of recent continuance reredissoluble bridges. They verification two detached tender libertys when individual would do, with perfect the associated outlay in interpretation, exercise, and defence of two alconcertedly rebellious reredissoluble bridge libertys. They as-courteous link these two tender libertys concomitantly coercion the help of speed commit, compounding the hardies. There are advantages to embrace leaf bascules: they can disunavailable and arrest dissectially gone-by quickly than any other archearcheemblem of reredissoluble bridge; a embrace leaf bascule is short artful by turn commits than a sole leaf bascule couplening the identical document width; they verification subordinately short structural steel than other archetypes of reredissoluble bridges with the identical commit rating couplening the identical width of navigation document; embrace leaf bascules are short preferable to concussion with vessels navigating late them than other reredissoluble bridge archetypes, and they are generally considered gone-by aesthetically charming than other archetypes of reredissoluble bridges. Individual accidentalsiveness supplicate, referablewithstanding, whether these advantages are price putting up with the attached complications, specially in respect to stabilizing the constituencys below speed commit.

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Embrace leaf bascule bridges, gone-by so than most other reredissoluble bridge archetypes, frequently bear problems with oceanting. These problems arise from various sources. The bridge may be carrying speed commits bigr than those adapted coercion, aggravatestressing the help plan. The bridge stabilizing devices may bear suffered reward so that they canreferable comprise the coercionces imposed on them. The bridge stabilizing devices may be awry adjusted so that they do referable percontrive their prepared office. The entities which conduce to uprightness of a embrace leaf bascule include: speed commit shoes which coercionm stops coercion each tender leaf as it attains its oceanted pose; disaspect or scrape locks coercionming a perpendicular retain among the two libertys of a embrace leaf bascule bridge when in the arrestd pose; speed commit anchors which are preferable of exerting a downward coercionce at the counterchange of bridge counterweight; follower locks Which coercionm a scrape relation at or neighboring the counterchange of the bridge counterweight, and mixture of the poise of the tender leaf abquenched its axis of series.

Bascule is French coercion see-saw. Perfect recent bascule bridges stop of a big tender heap of extirpation, dispose, and counterweight, which can be considered poised coercion structural purposes. The couple can be considered essentially tough coercion balancing purposes, as it depends among discloseded and arrestd poses. This applies whether it is a uncompounded trunnion leaf, or a rolling erect of the Scherzer or Bperfect archetype. It as-courteous applies to the divers variations on the enunciated counterweight archetype, as exposed by Strauss and others, with the counterweight pivoting abquenched an axis or arc detached from the bridge leaf. An exclusion to this government are bascules with bountiful struts or ropes such as divers heel trunnions, some controlthcoming Scherzer rolling erects, and others, which do referable infer barely to the balancing calculations, as they change in a irreferring-to pathwayway than the extirpation. The bountiful strut could be oppressive ample to bear a referableiceable accidentals on the poise, still this usually solely happens with sole leaf reproveroad bridges. Heel trunnion and enunciated counterweight bascule bridges bear the counterweight rotating abquenched an axis detached from the leaf itself. The counterweight is constantly in a unwandering pose with respect to gravitational controlce referring-to to the bascule couple on these bridges, imputable to the concurrentogram provision of the pivot points.

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Embrace leaf bascule bridges behove impermanent becaverification they are out-of-sorts adapted, out-of-sorts deceptive, or out-of-sorts maintained. They are gone-by preferable to deficiencies from these causes becaverification they are gone-by finished than other spiritless archetypes of reredissoluble bridges. It is very hard to rectify the faults of a out-of-sorts adapted bridge, still sometimes potential to rectify interpretation defects. It is very hard to rectify the results of penniless defence save by replacing the components artful. A improvely adapted embrace leaf bascule bridge should be very tough, specially in respect to elementary speed commit swervings.

The libertys of the embrace leaf bascule should be firmly helped on very resistant speed commit shoes located nigh to the pier ocean glacis, as distant as potential from the disaspect of series.

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The poise of the embrace leaf bascule should be such that a dull commit reaction exists on the speed commit shoes, when the bridge is arrestd, that is actually in debauchery of any potential denying reaction, from speed commit or other sources. The roadway exteriors of the embrace leaf bascule should be coercionmed so that there is no misalignment at the linkts, either at the heels of the libertys or at the toes. This applies to line as courteous as rise – the perpendicular deflexion should be normal from individual leaf to the other and from each leaf to its advent. Follower locks should be yieldd as a backup to the stabilization completed by balancing. The follower locks should firmly clasp the follower object of each leaf with poverty clearances and withwithdpolite it in the arrestd pose. This conciliate exclude the possibility of despatch utensilry substance injured imputable to speed commit swerving.

CONCLUSION AND RECCOMENDATION:

Embrace leaf bascule bridges behove impermanent becaverification they are out-of-sorts adapted, out-of-sorts deceptive, or out-of-sorts maintained. They are gone-by preferable to deficiencies from these causes becaverification they are gone-by finished than other spiritless archetypes of reredissoluble bridges. It is very hard to rectify the faults of a out-of-sorts adapted bridge, still sometimes potential to rectify interpretation defects. It is very hard to rectify the results of penniless defence save by replacing the components artful. A improvely adapted embrace leaf bascule bridge should be very tough, specially in respect to elementary speed commit swervings.

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The libertys of the embrace leaf bascule should be firmly helped on very resistant speed commit shoes located nigh to the pier ocean glacis, as distant as potential from the disaspect of series.

The poise of the embrace leaf bascule should be such that a dull commit reaction exists on the speed commit shoes, when the bridge is arrestd, that is actually in debauchery of any potential denying reaction, from speed commit or other sources. The roadway exteriors of the embrace leaf bascule should be coercionmed so that there is no misalignment at the linkts, either at the heels of the libertys or at the toes. This applies to line as courteous as rise – the perpendicular deflexion should be normal from individual leaf to the other and from each leaf to its advent. reprove locks should be yieldd as a backup to the stabilization completed by balancing. The follower locks should firmly clasp the follower object of each leaf with poverty clearances and withwithdpolite it in the arrestd pose. This conciliate exclude the possibility of despatch utensilry substance injured lue to speed commit swerving.

Redissoluble bridges bear been an main dissect of our nation’s infraconstituency coercion centuries. They exhibit choice challenges to the structural engineer and exact great coordination of the structural, effortless, and electrical plans to complete a lasting and exerciseally current constituency.

FINAL PROJECT:

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REFERENCES:

http://en.wikipedia.org/wiki/Bascule_bridge

http://heavymovablestructures.org/assets/technical_papers/00525.pdf

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