JPH0324653Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a concrete girder connecting work trolley. Instead of integrally molding long objects such as concrete girders for bridges, they are divided into transportable lengths and manufactured in a factory, and then transported to the construction site. To provide a trolley that works effectively in cases where a post tension is also provided at the same time as the link is made.

The present applicant has disclosed the “PC
Discloses an assembly device for post-tensioning concrete materials. This time, based on the experience of implementing the above idea, we improved the trolley that is used in large numbers to place and align the front and rear ends of concrete girders. In other words, we created a bogie that can cope with variations in rail width, has fewer jacking failures, and can stably support concrete girders.

Next, the configuration and implementation of this invention will be explained with reference to the drawings.

Figures 1, 2, and 3 are elevational, plan, and side views of an embodiment of this invention. Its main parts include a front and rear axle 2 that supports all the wheels 1 with enough room to adjust them in the axial direction, an underframe 3, a screw drive mechanism 4 for wheel position adjustment provided on this, and a screw drive mechanism 4 mounted on the underframe 3. vertical adjustment jacks 6 that stand on the left and right sides of the upper surface of the horizontally movable plate 5;
The right and left sides are supported by the heads 7 of the left and right jacks 6 each having a spherical support part, and the girder receiving plate 8 on which the concrete girder C is placed in the center presses the left and right edges of the horizontal movable plate 5 with the jacks 6 for positioning. Horizontal adjustment jacks 9 provided on both sides of the underframe 3, and the above-mentioned concrete girders C provided on the left and right ends of the underframe 3.
These are tension rod seats 10 and the like that are placed on the left and right sides of the upper part.

The spacing between the left and right rails R in Figure 1 may vary depending on the construction site. In that case, the conventional truck may not match the spacing between the wheels 2, and equipment must be provided to receive and adjust the concrete girder C on the truck that fits the rails. In the trolley of this invention, the position of each wheel 1 can be easily adjusted by turning the handle 4a of the screw drive mechanism 4, respectively. That is, by turning the threaded rod 4b via the handle 4a, the female thread 4d of the drive arm 4c engaged with the axle 2 across the wheel 1 is moved laterally. In this embodiment, each wheel 1 has an individual screw drive handle 4a, but if necessary,
It is also easy to link a plurality of wheels with one handle 4a.

In this embodiment, the underframe 3 has a shape in which left and right front and rear wheel frames are connected and fixed at the center. A horizontally movable plate 5 is superimposed on a supporting plate 3a fixed in a slightly floating position in the center thereof. As the name suggests, the horizontally movable plate 5 is movable in the horizontal direction, and is held together by left and right horizontal adjustment jacks 9 and gravity. However, in the center of the horizontally movable plate 5 there is a long hole 5a extending in the horizontal direction, which is fitted into a pin 11 vertically erected in the center of the lower frame-side support plate 3a. Therefore, the horizontally movable plate 5 is free to rotate horizontally and move left and right.

There are vertical adjustment jacks 9 on the left and right sides of this horizontally movable plate 5.
As mentioned above, the vertical reinforcing plates 5b are attached to the left and right ends of the vertical reinforcing plates 5b to make it easier to push the horizontal adjustment jacks 9.

The head 7 of the vertical adjustment jack 6 having a spherical support part greatly increases the life of the jack 6. Conventionally, when the heavy concrete girder C was supported directly by the upper end of the jack, a slight inclination of the girder C would cause the jack to malfunction or break. Due to the large weight involved, even a slight eccentric load can cause jitter, which has been improved by employing the spherical support portion 7a.

The former of the vertical adjustment jack 6 and the horizontal adjustment jack 9 is a screw type, and the latter is a hydraulic type, but it is of course up to the designer to decide whether to use a screw type or a hydraulic type. Needless to say, when aligning the ends of the concrete girders C, vertical discrepancies are corrected with the former, and horizontal discrepancies are corrected with the latter.

Furthermore, as a novel configuration of this invention, seats 10 for tension rods 12 are provided which are applied from the left and right ends of the truck to the left and right sides of the upper part of the concrete girder C. The tension rod 12 extends and contracts the inner tube 12a from the outer tube 12b in a telescopic manner, passes the skewer pin 12c from the elongated hole of the outer tube 12b to the pin hole on the inner tube 12a side, and connects it with the nut 12d of the outer circumference thread of the outer tube 12b. It has a well-known structure for supporting, and its base end fits into a seat 10 and is rotatable by a shaft pin 10a. Therefore, this tension rod 12 can accommodate changes in the size and shape of the concrete girder C. However, the structure of the tension rod 12 is free; for example, it can be made of lumber cut to an appropriate size, its upper end shaped to fit the concrete girder C side, and its lower end aligned with the catch 10 or aligned with the catch 10. It is left up to the implementation conditions and the designer's ingenuity, such as making the bottom end of the lumber fit into it. If there is a risk that the tension rods 12 may come off due to the inclination of the concrete girder C, etc., take measures for use such as fixing the wire rope ends to the catches 10 on both sides and tightening the top surface of the concrete girder C downward. has excellent on-site technicians.

Note that the tension rod 12 can be removed from the seat 10 when not in use.

As described above, one embodiment has been described, but this invention adds a wheel interval adjustment mechanism and a tension rod seat to the trolley disclosed in Utility Model Publication No. 49-8561, and also has a spherical surface on the head of the vertical adjustment jack. It goes without saying that it is characterized by the addition of a support part, and that it can be varied and applied in a variety of ways using well-known techniques according to the implementation conditions without changing its gist.

This invention was able to provide a concrete girder connecting trolley that could be used regardless of the rail spacing at the construction site by using a screw drive mechanism for wheel position adjustment. Even in cases where the center of gravity of the concrete girder cross section is high and the girder is prone to falling sideways, the bogie of this invention is highly safe because it has tension rod supports on the left and right sides of the girder top. We investigated the causes of many failures and damages of vertical adjustment jacks in the past, and installed a spherical support on the jack head to prevent the influence of the slight slope of the lower surface of the girder from adding to the jacking when adjusting the end faces of concrete girders. By adding this, we were able to extend the life of the jack and reduce work interruptions.

[Brief explanation of drawings]

1, 2, and 3 are a front view, a plan view, and a side view of an embodiment of this invention, and FIG. 4 is a detailed view of the head of the vertical adjustment jack. 4...Screw drive mechanism for wheel position adjustment, 6...Vertical adjustment jack, 8... Girder support plate, 9...Horizontal adjustment jack, 10...Tension rod support.

Claims (1)

[Scope of claim for utility model registration] Front and rear axles that support all the wheels with enough room to adjust and move them in the axial direction, an underframe, a screw drive mechanism for adjusting the wheel position provided thereon, and a horizontal structure placed on the underframe. Vertical adjustment jacks standing on the left and right sides of the upper surface of the movable plate; the left and right sides of the jacks are supported by heads with spherical support parts, and the girder receiving plate on which the concrete girder is placed in the center; the left and right edges of the horizontal movable plate with the jacks A concrete girder characterized by comprising: horizontal adjustment jacks lying on both sides of the underframe for pushing and positioning; and tension rod receivers provided at the left and right ends of the underframe and applied to the left and right sides of the upper part of the concrete girder. Dolly for connected construction work.