JPS628577B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sliding formwork device for a slide form construction method used for constructing, for example, circular bridge piers.

(Prior Art) In general, sliding formwork devices that continuously form a concrete structure by sliding a template up and down as concrete is poured when constructing a bridge pier, etc. are conventionally known.

This type of concrete construction method is called the sliding form method, and the characteristics of this construction method are that concrete is poured into movable formwork, and as the concrete hardens, the formwork is moved and the work is carried out sequentially. It has the characteristic that it can significantly shorten the construction period even for tall structures.

(Problems to be Solved by the Invention) However, even in the sliding form construction method as described above, the formwork is moved upward by rods embedded in hardened concrete or by jacks supported by pipes. The sliding form construction method requires a lot of multi-disciplinary work at once during the sliding period, such as concrete pouring, reinforcing bar assembly, and loading and transporting materials, and once the sliding work begins, the work is interrupted. Since this is not possible, careful planning and management are required in advance.

(Means for Solving the Problems) The present invention was invented in view of the above-mentioned points. The scaffold is constructed so that the lifting body is operated alternately and moved upward one after another like an inchworm, and the skin plate provided on the upper sliding body is also raised at the same time, and the working scaffold is also moved together. It requires less assembly, and the scaffold and skin plate are both mounted on the upper sliding body, i.e., shoe, and can be moved up and down, eliminating the need for a crane to attach and detach the skin plate, unlike the conventional method. This is a simple task that does not require multi-disciplinary work for a temporary period of time.

(Example) The embodiments shown in the drawings will be described below.

Reference numerals 1 and 2 denote upper and lower sliding bodies, each of which is formed by a cell chain consisting of a plurality of unit cases connected to each other in a chain so as to form an annular shape.

As shown in Figures 3 and 4, the unit cases 1a and 2a that form the cell chain are box-shaped, and their cross-sectional shapes are trapezoidal 3, 4, 5, and 6, and the inner sides 4 are arcuate surfaces. A rubber band 7 is stretched over this.

A horizontal partition plate 8 is stretched inside the unit cases 1a, 2a, and triangular reinforcing frames 9, 10 are vertically stretched between this and the side plates 5, 6.

The side plate 5 has upper and lower flanges 11 and 12.
The side plate 6 has a single flange 13, and coupling pins 14 are inserted into these pin holes 11a, 12a, 13a.
is inserted to connect the left and right cases together in a chain.

A plurality of cases connected in a chain form a two-split ring shape, and these two halves are connected by a horizontal jack 15 consisting of a hydraulic cylinder to form a ring shape as a whole.

The unit cases 1b and 2b to which the horizontal jacks 15 are attached are internally partitioned by a vertical partition plate 16, and a horizontal partition plate 17 is placed between this and the side plate 5, and the central part of the horizontal partition plate 17 is reinforced. There is a frame 18.

The side plate 6 has an insertion hole 6a through which a jack 15 passes, and a flange 1 protruding from the vertical partition plate 16.
Flanges 15a and 15a provided with the cylinder and piston rod of the jack 15 are inserted between the flanges 9 and 20, and the jack 15 is attached by inserting a pin 21 into each pin hole.

The flanges 11, 12 or a single flange 13 are protruded from the side plate 5 and are connected to the adjacent unit case 1a.

As mentioned above, the upper and lower sliding bodies 1 and 2 are also connected by the vertical jack 21, and the upper plate 22 of the unit cases 1a and 2a to which these are attached
Alternatively, the bottom plate 23 has joint plates 24, 24, and spherical pins 21c, 21c provided with the cylinder 21a or piston rod 21b of the vertical jack 21 fit into these spherical pin receivers 24a, 24a, forming a universal joint. There is.

Needless to say, the bottom plate 23 or the top plate 22 has holes 23a and 22a through which jacks are inserted. Since the upper and lower sliding bodies 1 and 2 are constructed as described above, the horizontal jacks 15 alternately extend and contract and the vertical jacks 21 extend and contract along the wall of the concrete structure cast in an inchworm manner. Each of the sliding bodies 1 and 2 can be moved. The upper sliding body 1 has a working scaffold 25 and a skin plate 26.
are provided so that these can be raised and lowered together with the upper sliding body 1. That is, the working scaffolding body 25 is composed of a plurality of tower-shaped scaffolding blocks 25a arranged in a circular ring, and the number of scaffolding blocks 25a is the same as that of the cell chain.

Adjacent turret-shaped scaffolding blocks 25a are formed into a half-ring shape by chain joints 27, 27a, 28, 28a, and the half-rings are connected by adjusting turnbuckle joints 29, 30 to form a circular ring as a whole. Configure.

The chain joint is designed to connect the outer upright turret frames 25b or the inner turret upright frames 25c, but in some cases, the outer upright turret frames 25b may be joined together by a turnbuckle joint 31.
The inner circumference of the upright turret frame 25c is pin hinge 3.
It may be set to 2.

And a unit case 1a forming a cell linkage between the lower end of the tower upright frame 25b on the outer periphery and the upper sliding body 1.
The outer side 3 of each bracket 33, 34 is a turnbuckle 3 which is diagonally stretched and has a universal joint.
They are joined by 5.

Further, the lower end of the inner peripheral tower upright frame 25c and the upper surface of the unit case 1a of the upper sliding body 1 are connected by respective brackets 36 and 37 with a universal joint 38.

The structure described above allows the tower-shaped scaffolding block 25a of the working scaffold to move back and forth and left and right to a certain extent with respect to the upper sliding body 1.

The connection between the inner peripheral tower upright frame 25c and the unit case 1a may have a connection structure as shown in FIG.

That is, a cylindrical bracket 36 provided on the inner periphery of the tower upright frame 25c is constructed so as to be able to slide along the upper surface of the cell linking ring connecting the unit case 1a, and a sliding washer 39 is screwed into the lower part of this bracket 36. , the bolt 40 fixed to the upper surface of the unit case 1a constituting the cell chain is inserted into the hole 39a of the sliding washer 39.
Washers 41, 42, and 43 are further stacked on the sliding washers 39 so that they can slide against each other, and the respective holes 41a,
The head of the bolt 40 inserted through 42a and 43a is fixed with a nut 45 via a washer 44.

Each hole 39a, 41a, 42a is configured to become smaller in size, and the hole 43a is configured to have approximately the same diameter as the bolt.
One end of the bracket 3a is parallel to the surface of the bracket 36.

Therefore, the bracket 36 can be moved and adjusted with respect to the bolt 40 from one end of the hole 42a toward the other end, and when the bolt 40 reaches the other end of the hole 42a, the bolt 40 is moved along with the washers 43 and 42 to the other end of the hole 41a. The movement can be adjusted freely.

When the bolt 40 reaches the other end of the hole 41a, it can be moved to the other end of the hole 39a of the washer 39 together with the washers 43, 42, 41 at the same time and can be adjusted in stages. Fix it in a certain position with a nut 45 to prevent relative movement.

The size of each hole is determined each time the moved washer does not abut the inner surface of the bracket 36.

Next, a skin plate (formwork) 26 is stretched inside the work scaffolding body 25, and this skin plate 26 is also made up of unit blocks 6a of the same number as the cell chains assembled in an annular shape. The semicircular arc-shaped tightening rings 46, 46, which have a fan-shaped cross section, are formed into an annular shape as a whole by connecting brackets 47, 47 formed at the ends of these rings with a turnbuckle 48. be done.

The illustrated tightening rings 46 are provided on the top, middle, and bottom of the skin plate 26, respectively.

A bracket 49 provided in the middle of the tightening ring 46 connects both tower upright frames 2 via a universal joint 50.
5b, 25c, and thereby the working scaffold 25
supports the skin plate 26.

Further, above the skin plate 26, there is a rubber chamber 55 having a triangular longitudinal section and protruding from the inner surface. Furthermore, a pin 5 is provided at the lower end of the skin plate 26.
2, which is connected so as to be able to slide in the slit groove 54 of the bracket 53 on the upper surface of the upper sliding body 1, so that the skin plate 26 can be moved left and right.

To construct a circular pier, first, after the foundation concrete is completed, a minimum of 1 meter of pier concrete is poured using conventional methods.

After pouring, the formwork is removed and the form is assembled.

That is, the upper and lower sliding bodies 1 and 2 for sliding are set on the poured concrete structure wall a as shown in FIG.

Concrete is then placed inside the skin plate 26. In this case, the concrete is transported and placed using a crane using the work scaffolding body 25.

After the concrete hardens after pouring, the lower sliding body 2
Loosen the horizontal jacks 15 and raise the lower sliding body 2 upward using the vertical jacks 21. When it reaches a predetermined height, tighten the horizontal jacks 15 to fix it to the concrete structure wall a.

Next, the tightening ring 46 of the skin plate 26 is loosened using the turnbuckle 48, the horizontal jack 15 of the upper sliding body 1 is loosened, and the upper sliding body 1 is raised together with the scaffolding body 25 and the skin plate 26 using the vertical jack 21. Then, the concrete is set at a predetermined height and fixed with horizontal jacks 15, and the tightening ring 46 of the skin plate 26 is also tightened with the turnbuckle 48, and the next concrete is poured. Even if the upper and lower sliding bodies 1 and 2 are operated alternately to move the inchworm forward,
As shown in FIG. 7, there is a rubber chamber 55 at the joint, which prevents mortar from flowing out from the joint of the formwork and acts as a sealant.

Once the pier concrete reaches the specified height,
First, the skin plate 26 is loosened, and then the sliding bodies 1 and 2 are lowered to the ground together with the scaffolding body and the skin plate by the reverse method of rising, and then dismantled.

Incidentally, although the embodiment has been described with respect to a circular pier, it can also be used with an elliptical pier as long as the fixed shoe can be fixed.

(Effects of the Invention) In any case, according to the present invention, the working scaffolding body is attached to the upper sliding body so as to be movable and adjustable, and the skin plate is also movable and adjustable with respect to the upper sliding body by the working scaffolding body. Since it can be attached freely, it is possible to adjust and stabilize the work scaffold that is the basis of the construction work, and this work scaffold allows for smooth assembly of the skin plate on the upper sliding body. Its position adjustment as well as subsequent support can be facilitated. Furthermore, it can be easily assembled with the skin plate without using a crane or the like and without skilled workers, and when disassembling it, it can be loosened and lowered to the ground together with the upper and lower sliding bodies. This simplifies the work and is convenient for constructing bridge piers, etc.

Further, in the conventional sliding construction method in which the formwork is moved upward by a jack supported by rods or pipes, there are restrictions on the bundling of reinforcing bars, but this is not the case with the apparatus of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the slide form construction method with some parts omitted, Fig. 2 is a side view of the same as above, Fig. 3 is a cutaway plane partial view of the sliding body, Fig. 4 is a cutaway side view of the same as above, Fig. 5 The figure is a vertical cross-sectional view of the vertical jack, Figure 6 is a cross-sectional view of the joint between the tower upright frame and the cell linkage of the upper sliding body, and Figures 7 and 8 are partial views of the skin plate and explanatory diagrams showing its construction method. It is. 1, 2...Vertical sliding body, 15...Horizontal jack, 21...Vertical jack, 25...Scaffolding body for work, 26...Skin plate.

Claims (1)

[Claims] 1. The upper and lower sliding bodies are vertically connected to each other and are provided with horizontal jacks for tightening a cell chain consisting of a plurality of unit cases connected to each other in a ring shape. The upper and lower sliding bodies are connected to each other by jacks, and each sliding body can be moved along the wall of the concrete structure cast in an inchworm manner by the alternate extension and contraction movements of the horizontal jacks and the vertical jacks of the upper and lower sliding bodies. In addition, a working scaffold in which a plurality of turret bodies are arranged in an annular manner is attached to the upper sliding body so that its position can be freely adjusted, and a skin plate supported by this working scaffold, A sliding formwork device for a slide form construction method, characterized in that it is installed in a ring shape inside a work scaffolding body so that it can be assembled freely, and the lower end of a skin plate is attached to an upper sliding body so that its position can be adjusted freely. 2. The pin provided at the lower end of the skin plate is slidably engaged with the slit groove of the bracket provided on the upper sliding body, and the lower end of the inner periphery of the work scaffold is placed on the upper sliding body to a certain extent in the front, rear, left and right directions. The work scaffold is supported by a bracket that allows movement, and the lower part of the outer periphery of the work scaffold is supported by an upper sliding body with a bracket via a turnbuckle with a universal joint stretched diagonally, and on the inside of the work scaffold, The turnbuckle, which has a universal joint attached to the frame member, supports the skin plate while adjusting its inclination and horizontal direction by connecting with the bracket of the tightening ring of the skin plate through the universal joint. The sliding formwork device for the slide form construction method according to claim 1, which is configured to be able to cope with changes in a predetermined surface of the plate to some extent.