CN101264850A - Tower machine descending method used for normal descend of building interference tower machine upper component - Google Patents

Abstract

The invention discloses a tower crane descending method which is used for ensuring the normal descending of the components of the upper part of the tower crane when interfered by buildings; the method is characterized in that: one or two attached supports at the upper part of the disassembly crane tower enable the tower body to suspend out; then use a jack to get the tower body inclined so that blocked components can leave the interference position and then descend the tower crane. The descending method has the advantages that the method is applicable for any type of tower cranes when blocked by buildings during the descending process; in particular when the interference size is not so large, the method is very simple and efficient.

Description

The tower machine descending method that is used for normal descend of building interference tower machine upper component

Technical field

The present invention relates to a kind of landing method of tower crane

Background technology

The tower mast of tower crane, main trunk body of the tower is made by standard knot, its consistent size, the jacking stock of tower machine upper, the size of members such as rotation body of the tower is a bit larger tham body of the tower.There is the phenomenon of interim change (such as the interim change of edge, roof gutter in construction) at the edge that sometimes can run into building a part in real work, the generations such as equilibrium arm girder that can cause stretching out edge and tower machine jacking stock and tower machine are interfered, the tower machine is obstructed when descending, and does not descend.

Summary of the invention

The object of the present invention is to provide a kind of tower machine descending method that is used for normal descend of building interference tower machine upper component, make the landing that still can make tower crane under the jacking stock of tower crane and the situation that rotation body of the tower and building interfere.

The tower machine descending method that the present invention is used for normal descend of building interference tower machine upper component is: dismounting tower machine topmost together or twice adhere to support, make body of the tower top hang, again with jack top leaning tower body, the tower machine is obstructed after member leaves interference position, tower machine again descends.

The principle of the inventive method is: the steel structure formula rod member that the body of the tower of tower machine is made up of the body of the tower standard knot, as the iron and steel stressed member, has the resistance to deformation rigidity in the certain limit of bearing, when the deformation force that applies, in the scope that its rigidity can bear (being not unstability of tower mast), after the scope of distance that distortion produces, can make the tower machine be obstructed member safely, realize the decline of tower machine by interfering the position greater than its interference.Therefore the present invention be suitable for any pattern the tower machine when height descends in the air, stopped by building etc., but interfere not very very big situation of size that this method is very simple, efficient.

Description of drawings

Fig. 1 is the scheme drawing that the inventive method is implemented.

Force analysis figure when Fig. 2 is the invention process.

The specific embodiment

The contriver has used a dwelling house complex building with the inventive method, what used construction period in this building is a Taijiang foot of a hill or mountain board QT125 type tower machine, when the finishing on building main body and top is finished substantially, edge, the roof gutter of finding this building when tearing this tower machine open need fall, because the interim change in the construction, all produced interference to the jacking stock that stretches out edge and this tower machine that makes the roof gutter and the equilibrium arm girder of tower machine, the gutter outer rim is height 0.8m vertically, interfere the about 0.7m of the degree of depth, the member that is obstructed on the tower machine is long equilibrium arm girder and the how high jacking stock of vertical direction 6m of horizontal direction 14m.At first should ajust tower machine crane arm when using the inventive method,, carry out as follows then referring to Fig. 1:

1. fall two joint standard knots, make the jacking stock 2 of this tower machine drop to the gutter boundary position;

2. remove first and second roads that the tower machine goes up most and adhere to and support 4,5, make the 3rd road adhere to supporting 6 apart from about the about 40m of distance of cat head, promptly body of the tower hangs highly 40m.At this moment tower machine can also rotate, owing to the strut of removing that adheres to support, enclose member such as hoop and need the master winch of tower machine to hang down, when tearing second road open and adhere to support, consider to make tower machine mainmast top hang oversize, should when turning round, crane arm remove the strut of back earlier; Ajust arm support position do not need the revolution after, tear fwd again open and adhere to bar, like this work comparatively safe.

3. for increasing safety rate, should adopt following two measures.

1. penetrate a Φ 20mm steel rope 7 hanging the body of the tower middle part, watchman's wooden clapper is tied on the building beam column, and watchman's wooden clapper will guarantee to leave free distance when pricking, and left room for when oblique for body of the tower pushes up, but this distance is not more than 200mm.

2. in the pinnacle of a pagoda on the bar beam on the building top watchman's wooden clapper prick Φ 15mm steel rope 8, and hang the bottle gouard moved by hands 9 of a 10t, in order to regulate tense wire rope, in case body of the tower is outwards pounced on suddenly in inter-burst.

4. distinguish two main strings of outside head tower body in the position of being obstructed with two jacks, with the body of the tower top tiltedly, be obstructed after member leaves interference distance until the tower machine, tower machine again descends, replace when becoming flexible as above-mentioned two jacks with two jacks more simultaneously and use, guarantee that two main strings are held out against by jack all the time, get rid of up to interference.Jack is owing to be that level is shelved, and every place should arrange jointly operation of two workmans, should put up the erect-position platform on body of the tower in advance, and also available iron wire horizontally suspends jack, alleviates hand-held labour intensity.

Because the extension elongation of jack is limited, can need distance by actual jacking, make the cushion block of all thickness in advance.

If it is long to hinder distance, need shift out standard knot in the time of can be because of the decline body of the tower, at this moment there has not been body of the tower master string, the jack of this moment can only withstand on the jacking stock, thus should select this member stiffness than the strength, or do in advance to strengthen processing, prevent to push up bad parts.

5. at tower machine 6m jacking stock how long 2 descend, then should solve the problem that equilibrium arm 3 is interfered by behind the gutter.Because equilibrium arm 3 rear portions are equipped with the various parts of hoisting mechanism, it is outer many that the equilibrium arm girder is deflected away from the position installation, and 0.8m is arranged approximately.Therefore the hold-down bolt of each parts of hoisting mechanism, pin hinge etc. should be taken apart, its translation is entered in the girder, install fasteningly temporarily again, recover the winch function, and the sidebar that girder is outer dismounting.Do like this is not increase the top as far as possible to stretch to outer distance y _Max,, cause many adverse factors because the increase of top inclined range can cause the increase of pushing up the power of stretching.

6. jacking process should be provided with a special messenger and be responsible for seeing the feelings commander, as run into jam or other fault takes place, and the inspection of should stopping is carried out after the eliminating again.

Outwards skew is approximately greater than the interference distance of 0.7m when body of the tower, and the jacking stock 2 and the equilibrium arm 3 that can descend and be blocked after these members that are obstructed pass through gutter, just can recover the plumbness of body of the tower 1, just can descend body of the tower according to a conventional method later.

To above-mentioned embodiment body of the tower top stressed with displacement relation as shown in Figure 2, body of the tower top is under horizontal top power effect, its displacement deformation should be calculated as follows:

y _max＝Pl ³/3EJ(1)

In the formula: y _MaxThe maximum defluxion of-body of the tower in elastic range; The horizontal force that the P-jack need apply; 1-top origin of force is to following vertical distance of adhering to the place together; The modulus of elasticity of E-material, steel are got E=2 * 10 ¹¹N/m ²The polar moment of inertia in J-body of the tower cross section.The cross section that this tower machine shows by Fig. 3 can calculate J=0.0213m ⁴.

It is the size that needs strict control that tower mast hangs length 1, and the whole hazard level of long more then tower machine is big more.By actual conditions as calculated, twice are adhered to after the supporting on removing, and the distance 1 that three roads, application of force place to the of jack the adhere to support 40m that has an appointment is ejecting distance y _MaxWhen reaching 0.7m, calculate needed top by (1) formula and stretch power P and be:

$P=\frac{Y_{\max }\&times;2\mathrm{<figure-callout\; id="3"\; label="EJ\; L"\; filenames="A20081003110500071.png"\; state="\{\{state\}\}">EJ</figure-callout>}}{L^{}}=\frac{0.7\&times;3\&times;2\&times;{10}^{11}\&times;0.0213}{{40}^3}=140\mathrm{kN}\left(14t\right)$

So, should adopt the mechanical type jack of two 8t.

In brief under the situation of building interference distance less than 700mm, the tower machine is descended should be comprised the steps:

A, the tower machine member that is obstructed is come to the building interference place;

The twice that b, dismounting are gone up are most adhered to support, make body of the tower hang height＜40m;

C, in tower machine pinnacle of a pagoda on the binder of roofing colligation one guy steel rope, in the middle of this guy steel rope, be connected in series a bottle gouard moved by hands by described binder place, send the special messenger to tighten up the guy stay cord constantly, twine the enough steel ropes of an intensity in body of the tower to the building pocket adhere to the position of support in second road near, assurance has free distance, and this distance is not more than 200mm;

D, with two jacks at the respectively two main strings of outside head tower body of position that are obstructed, with the body of the tower top tiltedly, be obstructed after member leaves interference distance until the tower machine, tower machine again descends, replace when becoming flexible as above-mentioned two jacks with two jacks more simultaneously and use, guarantee that two main strings are held out against by jack all the time, get rid of up to interference.

If the building interference distance should be carried out as follows less than the situation of 500mm:

A, the tower machine member that is obstructed is come to the building interference place;

B, remove go up most adhere to support together, make body of the tower hang height＜28m;

C, in tower machine pinnacle of a pagoda on the binder of roofing colligation one guy steel rope, in the middle of this guy steel rope,, send the special messenger to tighten up the guy stay cord constantly by 10 bottle gouards moved by hands of described binder place serial connection;

D, with two jacks at the respectively two main strings of outside head tower body of position that are obstructed, with the body of the tower top tiltedly, be obstructed after member leaves interference distance until the tower machine, tower machine again descends, replace when becoming flexible as above-mentioned two jacks with two jacks more simultaneously and use, guarantee that two main strings are held out against by jack all the time, the former member that is obstructed is not interfered in the decline process.

Claims (3)

1. a tower machine descending method that is used for normal descend of building interference tower machine upper component is characterized in that, dismounting tower machine topmost together or twice adhere to support, make body of the tower top hang, again with jack top leaning tower body, the tower machine is obstructed after member leaves interference position, tower machine again descends.

2. tower machine descending method according to claim 1 is characterized in that comprising the steps:

A, the tower machine member that is obstructed is come to the building interference place;

B, under building interference distance situation less than 500mm, remove go up most adhere to support together, make body of the tower hang height＜28m;

C, in tower machine pinnacle of a pagoda on the binder of roofing colligation one guy steel rope, in the middle of this guy steel rope,, send the special messenger to tighten up the guy stay cord constantly by bottle gouard moved by hands of described binder place serial connection;

D, with two jacks at the respectively two main strings of outside head tower body of position that are obstructed, with the body of the tower top tiltedly, be obstructed after member leaves interference distance until the tower machine, tower machine again descends, replace when becoming flexible as above-mentioned two jacks with two jacks more simultaneously and use, guarantee that two main strings are held out against by jack all the time, get rid of up to interference.

3. tower machine descending method according to claim 1 is characterized in that comprising the steps:

A, the tower machine member that is obstructed is come to the building interference place;

B, under building interference distance situation less than 700mm, remove the twice that go up most and adhere to support, make body of the tower hang height＜40m;

C, in tower machine pinnacle of a pagoda on the binder of roofing colligation one guy steel rope, in the middle of this guy steel rope, be connected in series a bottle gouard moved by hands by described binder place, send the special messenger to tighten up the guy stay cord constantly, twine the enough steel ropes of an intensity in body of the tower to the building pocket adhere to the position of support in second road near, assurance has free distance, and this distance is not more than 200mm;

D, with two jacks at the respectively two main strings of outside head tower body of position that are obstructed, with the body of the tower top tiltedly, be obstructed after member leaves interference distance until the tower machine, tower machine again descends, replace when becoming flexible as above-mentioned two jacks with two jacks more simultaneously and use, guarantee that two main strings are held out against by jack all the time, get rid of up to interference.

Images