JPH0237468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a concrete structure such as a culvert using a movable formwork within an earth retaining shoring.

When constructing long culverts such as underground passages or waterways underground, the conventional method is to install earth retaining walls such as sheet piles on both sides of the site where the structure is planned to be constructed, and then excavate between the opposing earth retaining walls. At the same time, a large number of horizontal struts and the like are constructed between these retaining walls, and work is carried out in this condition.

Under such conditions of shoring using struts that cross the construction site, the work space becomes narrower, and
There are many restrictions on transporting equipment and setting up facilities, which not only reduces work efficiency, but also
It would require huge construction costs. especially,
Assembling, dismantling, and moving formwork for pouring concrete requires complicated work in small spaces, so improving formwork construction has become a major issue.

The present invention has been made to solve the above-mentioned problems, and when constructing structures such as culverts, a so-called moving formwork method is introduced in which formwork assembled to a required scale is sequentially moved. This not only makes it possible to secure a large work space, but also allows formwork work such as shaping, demolding, and moving the formwork to be performed easily and labor-savingly, improving construction efficiency and reducing costs. The purpose is to provide a method for constructing new concrete structures such as culverts that can achieve the following.

Hereinafter, embodiments of the construction method of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 indicates an earth retaining wall built along both outside sides of the site where the structure is planned to be constructed, and is generally constructed by driving sheet piles, etc., and the required spacing is maintained between the two earth retaining walls 1, 1. Strand 2 for earth pressure support,
2... will be constructed. Then, the target structure is constructed between the earth retaining walls 1 and 1.

The structure to be constructed is constructed by first constructing the base 3, then simultaneously constructing the side wall sections 6, 6 on both sides thereof and the ceiling slab 5 extending between the upper ends thereof. There are no particular limitations on the method of constructing the foundation 3, and conventionally known methods can be used, for example, by pouring concrete into the slab part after reinforcing, and by using hand-assembled formwork or moving formwork for the rising parts on both sides. Place concrete using.

When concrete is being applied to the side wall portions 6, 6 and the ceiling slab 5 to be constructed on the top surface of the base 3 which has been constructed, as will be described later, the upper side wall portion of the side walls 6, 6 from the vicinity of the strut 2 is Upper inner formwork device A applied to concrete pouring with ceiling slab 5
A traveling truck B is used to support and move the device A, and lower side wall formwork bodies 7 are used for pouring concrete into the lower side wall.

The upper inner formwork apparatus A arranges a plurality of cross beams 8 at required intervals in the length direction of the construction structure, erects a slab sheath plate 9 on the upper surface of the cross beams 8, and constructs vertical beams 1.
A side wall weir plate 14 is constructed on the outside of a slab form frame 11 which is constructed by connecting each cross beam 8 by means 6 and 16, and side wall vertical flaps 13 and 13 which are pivotally connected to the cross beam 8 by pins or the like. It has upper side wall formwork bodies 15, 15 configured as follows. Each of these formwork bodies 11, 14, 14 is supported by an underframe 18 formed by vertical beams 16, 16, columns 17, 17, etc., and on both sides of the lower surface of the underframe 18, Girder rails 27, 27 extending in the length direction of the structure are attached. Additionally, the upper side wall forms 14, 14 and the underframe 18 are connected to telescopic members 19, 1
9, and by expanding and contracting these, the upper side wall forms 14, 14 can be freely adjusted in tilting inward and outward directions about the pivot point 12.

The traveling trolley B has pillars 20, 20 that stand upright at approximately the same spacing as the girder rails 27, 27 of the upper inner formwork device A.
A plurality of vertical frames 21 having the following are arranged at required intervals along the length direction of the construction structure, and the vertical frames 21, 21 are integrally connected by connecting beams 22, 22, etc. At the same time, casters 25 having wheels 23 at the lower end and whose height can be adjusted freely by a lifting mechanism 24 such as a screw type or oil type are provided at the front and rear ends thereof. . In addition, each vertical frame body 2
Support rollers 26, 26 are provided on both sides of the upper end of the upper inner formwork device A, on which girder rails 27, 27 of the upper inner formwork device A can be placed and the device A can be guided. The total length of the traveling truck B is configured to be substantially the same as the total length of the upper inner formwork device A.

In addition, the lower side wall formwork body 7 is constructed by assembling vertical flaps 28 and horizontal flaps (not shown) in a lattice pattern as a whole, like a conventional general formwork, and has wall sheathing plates 29 on the outside. The formwork body 7 may be constructed by attaching the formwork body 7, but the formwork body 7 may be constructed by a conventionally known manual assembly or hand-cutting method, or a movable formwork body may be applied.

The construction method of the present invention is carried out using the above-described upper inner formwork device A, traveling trolley B, and lower side wall formwork bodies 7, 7. That is, first, rails 31, 31 extending in the length direction of the construction structure are laid on the upper surface of the base 3, and the traveling trolley B is placed thereon. 27, 27 are supported on guide rollers 26, 26, and the upper inner formwork device A is placed thereon. Then, the elevating mechanism 2 of the traveling trolley B
4 to raise the upper surfaces of the support rollers 26, 26 to an appropriate height above the upper surfaces of the guide rollers 30, 30 temporarily installed on the strut 2, and raise the slab form body 11. Then, by adjusting the telescopic members 19, 19, the upper side wall forms 15, 15 are set at the predetermined positions, respectively. Next, the lower side wall formwork bodies 7, 7 are connected to the lower ends of the respective upper side wall formworks 15, 15, and fixed to the retaining walls 1, 1, etc. with fasteners 32, 32.

In addition, in this case, each form body 11, 15, 15,
It goes without saying that the rear ends of 7 and 7 should be in contact with the inner surface of the existing culvert 4 as shown in Figure 3, and that they should be distributed in advance when setting each formwork. .

Further, as the outer formwork in this case, earth retaining walls 1, 1 installed on both sides as shown in the figure are usually used. In addition, when constructing the side wall portion of the culvert considerably inside the retaining walls 1, 1, it is necessary to separately install an external formwork, but in that case, conventionally known hand-assembled or mobile formwork is required. You can use formwork. Furthermore, the vertical frame body 21 is not provided with casters 25.
It is preferable to insert a pedestal 33 under it as appropriate to resist the load caused by concrete pouring.
However, the load of the concrete may not be applied to the carriage B, but the load may be supported using a conventionally known column, or the carriage B and the column may be used together.

Concrete is cast using each of the formwork bodies set in this way, and after it has hardened, the formwork bodies are peeled off. To do this, first, the lower side wall formwork bodies 7, 7 are peeled off and removed. . Next, guide rollers 30, 30 are temporarily installed on the upper surface of the strut 2 at positions facing the girder rails 27, 27 of the upper inner formwork device A (see Fig. 4), and the upper inner formwork is installed as shown in Fig. 2. Frame device A
The telescopic members 19, 19 are contracted, and the upper side wall formwork 1 is retracted.
5 and 15 are tilted inward around pins 12 and 12 to separate them from the concrete. and,
After removing the pedestal 33, the elevating mechanism 2 of the traveling trolley B
4 and 24 to lower the traveling trolley B,
The upper inner formwork device A is placed on support rollers 26, 26 and lowered by its own weight, and the slab formwork body 11 is peeled off from the concrete. It rests on guide rollers 30, 30 provided on the upper surface of the strut 2, and the upper inner mold device A is supported on these guide rollers 30, 30.

Next, as shown in Fig. 4, the carriage B is lowered further so that its support rollers 26, 26 are positioned below the lower side of the strut 2, and the carriage B is pushed in the direction of the arrow in the figure. Then, the robot moves on the rails 31, 31 to the next construction position. After the movement, the lifting mechanisms 24, 24 are extended again as shown in FIG. By raising the upper inner formwork device A to a level where they are flush with each other, and then pushing the upper inner formwork device A as shown by the arrow in the same figure, the device A moves over the guide rollers 30, 30 and support rollers 26, 26 to the girder rail 27, 27 to the next construction position.

Thereafter, the construction of structures such as culverts is proceeded by repeating the above steps.
In the above embodiment, the guide rollers 30, 30 on the strut 2 are temporarily installed prior to the lowering operation of the upper inner formwork device A; It can also be temporarily installed before the frame device A is introduced.

As explained above, the present invention enables an upper inner formwork device in which an upper side wall formwork body is attached to a slab formwork body in a tilt-adjustable manner to be supported by a traveling cart whose height is freely adjustable. Concrete is poured with the support supported, and after the concrete has hardened, the traveling carriage is lowered and the upper inner formwork device is placed on the guide rollers of the strut, and the traveling trolley is lowered to the bottom of the strut. Then, the upper inner formwork device is moved to the next construction position using guide rollers and support rollers on the traveling truck, and these steps are repeated. As the construction progresses, the setting, resetting, peeling and moving of the formwork from the concrete can be easily and efficiently carried out, and the large loads associated with concrete pouring are carried by a traveling trolley, allowing for easy cutting of the earth retaining. Prevents excessive force from acting on the beam,
Not only can construction be carried out with a high degree of safety, but the work space can also be expanded, and many other excellent effects can be achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the construction method of the present invention. Figure 1 is a cross-sectional view showing how each formwork is set for culvert construction, and Figure 2 is a cross-sectional view showing how each formwork is set from concrete. Fig. 3 is a side sectional view showing the state in which it is peeled off, Fig. 3 is a side sectional view showing the state in Fig. 1, Fig. 4 is a side sectional view showing the state in which the traveling cart is moved, and Fig. 5 is the upper inner mold. It is a side sectional view showing the state where a frame device is moved. A... Upper inner formwork device, B... Traveling trolley, 1... Retaining wall, 2... Strut beam, 3... Foundation, 4... Existing culvert,
5... Ceiling slab, 6... Side wall portion, 7... Lower side wall form body, 11... Slab form body, 15... Upper side wall form body, 18... Underframe, 19... Expandable member, 21... Vertical frame body, 23 ...wheels, 24...lifting mechanism, 25...castors,
26... Support roller, 27... Girder rail, 30... Guide roller, 31... Rail.

Claims (1)

[Claims] 1 Using an upper inner formwork device configured by connecting upper side wall formwork bodies on both sides of the ceiling slab formwork body in a tilt-adjustable manner, and a traveling trolley whose height is freely adjustable from above to below the struts. , the upper inner formwork device is supported on the traveling trolley and concrete is cast, and after the concrete has hardened, the traveling trolley is lowered and the upper inner formwork device is placed on guide rollers temporarily installed on the struts. A method for constructing culverts, etc., characterized in that the traveling truck is moved to the next construction position, and then the upper inner formwork device is moved on guide rollers to the next construction position.