JPH0339954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a simple crane for erecting a medium-sized steel tower, which is used for erecting a steel tower, particularly a medium-sized steel tower.

(Prior art) Some cranes for erecting steel towers have a post that stands upright in the center of the tower and a jib on the head of the tower. Required up to about the height.

Therefore, after the post is delivered to the site and erected, transportation costs associated with transporting it to the base will increase.

Furthermore, the equipment and labor costs for climbing cannot be ignored.

Therefore, in order to reduce construction costs, it is desirable to simplify this post.

(Object of the invention) This invention was proposed based on the above-mentioned request, and its purpose is to provide a compact, lightweight, safe,
To provide a simple crane for erecting medium-sized steel towers that has excellent operability and can be erected at low cost.

(Structure of the Invention) A simple crane for constructing a medium-sized steel tower according to the present invention is a simple crane that constructs a steel tower while ascending along one side of a steel tower composed of two main pillar members. , a jib crane, a mast of a predetermined length hung vertically from the base of the jib crane, both ends of which can be attached to and detached from the two main pillars of the two steel towers at the same predetermined distances above and below, and the center part of which is It consists of three levels of horizontal support beams attached to the mast, one above the other, and a lifting device that raises these three levels of horizontal support beams. It is fixed to the mast, and the center part of the other two horizontal support beams is attached to a moving body that can slide up and down along the mast, and the lifting device fixes the upper and middle horizontal support beams to the main column of the steel tower. The lower horizontal support beam is fixed to the main pillar material of the steel tower, the horizontal support beams of the upper and lower stages are fixed to the main pillar material of the steel tower, and the horizontal support beams of the middle and lower stages are fixed to the main pillar material of the steel tower. Each of the horizontal support beams is configured to be able to be raised sequentially by the above-mentioned distance, and these three levels of horizontal support beams are raised alternately by a lifting device so that they self-climb in an inchworm-like manner.

(Example) The present invention will be described below based on an illustrative example.

In the present invention, the lower part of the tower is erected up to about 20m using a crane installed on the ground, such as a truck crane or a derrick, and the simple crane according to the present invention is used to construct a medium-sized tower at a higher height. do.

This was done in order to avoid increasing the span of horizontal support beams, which will be described later, and to reduce the weight of the device by minimizing the hanging load.

As shown in Fig. 1, the crane of the present invention is capable of building a steel tower while ascending by itself in an inchworm-like manner along one side of the steel tower, which is made up of two main pillars P ₁ and P ₂ . It is a simple crane that has a jib crane 1, a mast 2 of a predetermined length suspended from the base 1A of this jib crane 1, and both ends of which are detachably attached to two steel tower main pillars P ₁ and P ₂ . It consists of three upper horizontal support beams 3, a middle horizontal support beam 4, and a lower horizontal support beam 5, which are attached to the mast 2 at the center.

The upper and middle horizontal support beams 3 and 4 are attached to a sliding movable body 8 whose center portion is guided by the mast 2, and are movable in the vertical direction with respect to the mast 2. 2, and a pair of upper and lower lifting devices 6 move the upper horizontal support beam 3, the middle horizontal support beam 4, and the lower horizontal support beam 5 to the upper and middle horizontal support beams 3, 4. are fixed to the main pillars P ₁ and P ₂ to form the lower horizontal support beam 5, and the upper and lower horizontal support beams 3 and 5 are fixed to the main pillars P _{1 and 5} .
The middle horizontal support beam 4 is fixed to P ₂ , and the middle and lower horizontal support beams 4.5 are fixed to the main pillars P ₁ and P ₂ , and the upper horizontal support beam 3 is fixed at the same distance of 1 pitch. By raising the crane in sequence, the crane is configured to rise like an inchworm using the mast 2 as a guide rail, and the crane can rise by itself without installing a special guide rail.

Here, in order to avoid interference between beams when beams 3, 4, and 5 move alternately and loom up, the length of the mast should be three times the length of the looming pitch, as shown in Figure 2. Using this, you will be able to push it up in the order shown in Figure 2.

In the present invention, such things are also allowed, but in such a case, between the attraction point A and the intersection point of the main pillars P ₁ and P ₂ of the steel tower and the axes of the bracing. If the distance of 1 bit is, for example, 3.2 m, the length of the mast will be tripled to nearly 10 m, which is not preferable from the point of view of transportation.

Therefore, as shown in Figures 3 and 4, in the process of rising, the lower beam 5 is moved up to the lower surface of the middle beam 4, the middle beam 4 is moved to the lower surface of the upper beam 3, and the upper beam 3 is moved up to the lower surface of the middle beam 3. The length of the mast 2 is made to be approximately twice the length of the rising pitch by moving the mast 1 pitch sequentially along the main pillars P ₁ and P ₂ and rising.

In addition, horizontal support beams 3, 4, and 5 are attached to the main pillars P ₁ and P _2.
If the connection point B is the reference point for attaching and fixing the braces attached to the main pillars P ₁ and P ₂
Since the lower end of P′ is a distance d ₀ below the attraction point A,
It is impossible to raise the horizontal support beams 3, 4, and 5 above the lower end of bracing P', and the connecting plate 10 (the fifth
The connection point B facing the horizontal support beam (see figure) is provided at a position separated from the attraction point A by the sum d ₀ +d of the distance d ₀ and the height d of the horizontal support beam.

The push-up is performed in the following order (see Figure 3).

(i) After the crane work is completed, fix the upper horizontal support beam 3 and the middle horizontal support beam 4 to the steel tower.

(ii) Raise the lower horizontal support beam 5 fixed to the mast 2.

(iii) After fixing the upper and lower horizontal support beams 3 and 5 to the steel tower, the middle horizontal support beam 4 is raised.

(iv) The raised middle horizontal support beam 4 is fixed to the steel tower, and the upper horizontal support beam 3 is raised.

(v) Unfix the middle horizontal support beam 4, support the crane with the upper and lower horizontal support beams 3 and 5, and perform crane work.

Here, the middle horizontal support beam 4 is raised by a distance d for the next raising step, but there is no need to fix it to the connection point B again.

The above steps (i) to (v) are repeated in sequence to construct the steel tower.

Next, the upper and middle horizontal support beams 3 and 4 that move along the mast 2 have a movable body 8 that slides along the mast 2 at its center so as to hold it.
is attached, and connection plates 10 are provided protruding from the lower surfaces of both ends thereof, and are configured to be able to face the connection fittings 9 protruding from the connection point B of the main pillars P ₁ and P ₂ . (See FIGS. 5 and 6) The movable body 8 is provided with a guide roller that rolls on two surfaces of the mast, and the connecting plate 10 and the connecting fitting 9 are connected by pins.

Furthermore, it has a mechanism that can adjust the distance between the beam, that is, the steel tower, and the mast 2 so that the mast 2 can pass through a bend point as described later. That is, a pair of left and right anti-rotation levers 11 are horizontally protruded from the center of the horizontal support beams 3 and 4, and the levers 11 are inserted into the movable body 8, causing the mast 2 and the beams to move in the horizontal direction. Adjustably connected.

Further, the position adjustment is performed by rotating the male screw member 12 whose tip end is pinned to the movable body 8, the nut member 13 that is rotatably attached to the beams 3 and 4 and screwed into the male screw member 12, and the nut member 13. This is done by bevel gears 14 and 15.

In the case of the lower horizontal support beam 5, since it is fixed to the mast 2, a position adjustment device 16 as shown in FIGS. 7 and 8 is used.

This position adjustment device 16 includes a male screw member 17 that is installed on the upper surface of both ends of the beam 5 and whose tip can be pinned to the connecting metal fitting 9, and a nut member that is rotatably attached to the beam 5 and screwed into the male screw member 17. 18
and a telescope-shaped outer cylinder 1 that covers the male threaded member 17.
It consists of 9.

As shown in FIGS. 9 and 10, the connection plate 10 attached to the beams 3 and 4 and the connection hardware 9 attached to the connection point B of the steel tower are connected with bolts, but the beam
In the case of , only the bottom surface is sufficient, but in the case of the beam 4, as mentioned above, it will be connected to the connecting hardware 9 at the top or bottom during the raising process, so
Connection plates 10 are provided above and below.

Furthermore, as shown in FIGS. 11 and 12, the connecting plate 10 has a long bolt hole 20 formed in the beams 3 and 4 at a predetermined pitch, and a long hole 21 formed in the substrate 10A. The horizontal mounting position is adjusted.

In the case of the lower horizontal support beam 5, as shown in FIG.
1 will be provided.

Further, there are cases where two beams are attached to one connection point, and in this case, two connection plates 10 are attached to one connection hardware 9 on the left and right sides. (1st
(See Figure 4).

Furthermore, as shown in Fig. 15, beams 3, 4, 5
are divided in the longitudinal direction and connected by a joint plate 23. This makes it easier to transport, and when it is pushed up, the side protruding parts can be removed.

Next, the lifting devices 6 are arranged as a pair on both sides of the mast 2, and as shown in FIG. and a winch 25 installed on the lower surface of the upper horizontal support beam 3 to raise the middle horizontal support beam 4.

The chain 26 of the winch 24 has one end fixed to the upper horizontal support beam 3, and the other end fixed to the upper horizontal support beam 3 via a sprocket 27 at the top of the mast and the winch 24.

The chain 28 of the winch 25 has one end fixed to the mast 2 and the other end fixed to the middle horizontal support beam 4. Note that the lifting device 6 is not limited to this figure, and it is naturally possible to attach it to the upper and middle horizontal support beams.

In addition, as shown in Fig. 17, the jib crane 1
The base 1A and the upper end of the mast 2 are pinned together on the side opposite to the steel tower, and the male thread member 29 and the nut member 30
It is said that horizontal adjustment is possible.

Furthermore, when passing through the bend point, the 18th
As shown in FIG. 19, in addition to normal climbing, the position adjusting member is adjusted to pass. At this time, adjust so that the base 1A of the jib crane is horizontal.

Next, FIGS. 20 and 21 show another example of the connection between the beam and the main column of the steel tower, which can be attached and detached by a band 31 and fall prevention hardware 32.

After completing the tower assembly, the crane can be lowered in the reverse order of climbing, or
If there is a winch or the like on the ground, pulleys 33 and 34 are placed on the tower and the top of the mast as shown in FIG. 22, and the crane body is lowered using a wire rope 35.

In addition, when descending by hanging, if the crane is to be lowered stably, it can also be carried out in conjunction with the inchworm method in the descending direction. However, in this case, the fitting between the beam and the steel tower should be of the order of 36 pieces as shown in FIG. 23.

In addition, although the case where the lower stage is a fixed beam is shown above, the present invention is not limited to this, and the present invention also includes those where the upper stage is a fixed beam and the middle stage is a fixed beam.

(Effects of the Invention) Since the present invention has the above-described configuration, it has the following effects.

(i) There is no need to install special guide rails;
Since it is lifted using one crane mast and three horizontal support beams, the device can be made small and lightweight.

(ii) Since the beams are moved alternately using the lifting device within the device, safety and operability are excellent.

(iii) A medium-sized steel tower can be constructed at low cost from (i) to (ii).

(iv) Compared to the guide rail method, when climbing, the two horizontal beams are always fixed to the main column, and the crane body can be raised and lowered by raising and lowering one horizontal beam, so the operation is simple. , the vertical movement is carried out safely and reliably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a simple crane according to the present invention, FIGS. 2 a to d are process diagrams showing the basics of the uphill method according to the present invention, and FIG. 3 through the uphill method according to the present invention Figures 4a to 4c are front views showing similar steps, Figures 5 and 6 are sectional views and side views showing the connection between the mast and the beam, and Figures 7 and 8 are 9 and 10 are perspective views and cross-sectional views showing the lower horizontal support beams, and FIGS. 9 and 10 are cross-sectional views showing the upper and middle horizontal support beams.
Figures 1 and 12 are perspective views and front views showing the connection plates for the upper and middle beams, Figure 13 is a perspective view of the connection plates for the lower beams, and Figure 14 is a schematic diagram showing the connection state. , FIG. 15 is a perspective view showing the joint part of the beam, and FIG.
Figure 17 is a side view showing the lifting device, Figure 17 is a front view showing the crane leveling device, Figure 18, Figure 1.
Figure 9 is a process diagram showing the passage of the crane through the bend point, Figures 20 and 21 are front and plan views showing another method of connecting the beam and the main column, and Figure 22 is the lowering method of the crane. FIG. 23 is a front view showing one example, and FIG. 23 is a partial sectional view of FIG. 22. 1... Jib crane, 1A... Base, 2... Mast, 3, 4, 5... Horizontal support beam, 6... Lifting device, 7... Guide roller, 8... Moving body, 9...
Connection hardware, 10... Connection plate, 11... Rotation stop lever, 12... Male thread member, 13... Nut member, 14, 15... Bevel gear, 16... Position adjustment device, 17... Male thread member, 18 ... Nut member, 19 ... Telescope type outer cylinder, 20 ... Bolt hole, 21 ... Long hole, 22 ... Board, 23 ... Joint plate, 24, 25 ... Winch, 26, 28 ...
Chain, 27... Sprocket, 29... Male thread member, 30... Nut member, 31... Band,
32... Fall prevention hardware, 33, 34... Pulley, 3
5...Wire rope, 36...Prevents slipping off.

Claims (1)

[Claims] 1 A simple crane that constructs a steel tower by climbing along one side of the steel tower, which is made up of two main pillar materials, and consists of a jib crane and a crane of a predetermined length that is vertically installed at the base of the jib crane. A mast, three vertically horizontal support beams whose ends are removably attached to the two steel tower main pillars at the same distance above and below, and whose central portions are attached to the mast; It consists of a lifting device that raises the horizontal support beams of the tiers, and one of the horizontal support beams of the three tiers has its center fixed to the mast, and the center of the horizontal support beams of the other two tiers is fixed to the mast. The lifting device is attached to a movable body that can freely slide up and down along the mast, and the lifting device fixes the upper and middle horizontal support beams to the main pillar material of the steel tower, and fixes the lower horizontal support beams to the upper and lower horizontal support beams. is fixed to the main pillar material of the steel tower to make the middle horizontal support beam, and the middle and lower horizontal support beams are fixed to the main pillar material of the steel tower so that the upper horizontal support beam can be raised sequentially by the above-mentioned distance. A simple crane for erecting medium-sized steel towers.