JPH0610358A - Caisson construction method and caisson construction form device - Google Patents

Abstract

PURPOSE:To enhance work efficiency by laying out a lattice-shaped support frame on the top of a form device inside each of divided chambers formed in the shape of lattice and fixing the support frame temporarily. CONSTITUTION:A caisson consists of an outside wall 2 vertically integrally installed to an outer periphery of a slab 1 built up on a ground section and a lattice-shaped partitioning wall 4 integrally built up inside the slab 1 and segmented in divided chambers A-1 to A-6, and D-1 to D-6. A form devices is laid out respectively inside every divided chamber excluding the divided chambers A-2 and D-5. Then, the support frame 7 is laid out on the form device 5 in the shape of lattices all over the whole areas of the divided chambers A-1 to A-6, and D-1 to D-6 in conformity with the sides of the outside wall 2 and the partitioning wall 4 where the support frame 7 is temporarily fixed with the outside wall 2. When the lower end of each form 5 is temporarily fixed with the side of the lower side partitioning wall 4 already built up while the upper end is provisionally fixed with the support frame, each form 5 can be installed with accuracy in every direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a large-scale concrete caisson and a formwork apparatus suitable for this method.

[0002]

2. Description of the Related Art A large caisson made of concrete has a structure in which the inside surrounded by an outer wall is further divided by a partition wall into a number of rectangular compartments at the upper part of a bottom slab. In order to construct a caisson of this structure, a bottom slab is first constructed in the above-ground part, and then the partition wall is constructed simultaneously with the outer wall on the top of this bottom slab.

Also, since the height of this type of large caisson is relatively high, when constructing the partition wall, it is not possible to dispose the formwork of that height at a time, and first, on the bottom plate rod of the bottom plate. After arranging the first formwork and constructing the lower side partition wall by pouring concrete, form the formwork further on top of this lower side partition wall as a reference, and join the upper side partition wall. Repeat to the desired height.

[0004]

However, in the prior art, when manufacturing the above-mentioned mold, after the weir plates were assembled with vertical and horizontal edges with thick corners and formed into a rectangular shape, they were transported to the site by a crane and further I'm angry and I'm hanging a support beam,
It requires a great deal of labor and effort to obtain the assembly accuracy. Moreover, when assembling and reassembling the formwork, all of these arrangements and removals depend on human power, and the weight is heavy, which requires a great deal of work.

Further, in the past, in order to prevent the deformation of the formwork due to the lateral pressure applied at the time of placing concrete, after the formwork is installed, the formwork is stretched by a plurality of tie rods to prevent the entire form from being deformed. I supported it, but although it is actually effective in the axial direction of the tie rod, that is, the tension direction,
No effect on overall distortion could be expected.

Further, when the formwork is installed in the next step, since there is no structure for restricting and fixing the upper end of the formwork, it is necessary to make an overall adjustment in order to secure the installation accuracy, and it takes time for the adjustment. There was a drawback that many could be taken.

The present invention is intended to solve the above problems, and an object of the invention is to quickly arrange and rearrange formwork,
(EN) Provided are a caisson construction method and a caisson construction formwork device which are not deformed during concrete pouring and can be easily installed and have high installation accuracy.

[0008]

In order to achieve the above-mentioned object, a caisson construction method according to the present invention forms a plurality of compartments by constructing a partition wall for partitioning a horizontal cross section into a lattice shape in the upper part of a bottom plate. In the caisson construction method as described above, a plurality of climbing type formwork devices in which formwork is arranged on the four side surfaces are arranged in line for each of the sections, and the lower end of each formwork is temporarily fixed on the bottom plate. At the same time, a first step of disposing a grid-shaped support frame on the upper part of the mold and temporarily fixing the upper ends of the molds to the support frame, and making the molds face each other directly above the bottom plate. The second step in which concrete is poured inside and the lower partition wall is integrally joined to the upper part of the bottom plate, and the temporary fixing of each part is released, and each mold is released from the mold, and then the mold device And raise the support frame to temporarily fix Next, a third step of temporarily fixing the lower end of each of the molds to the upper end of the lower partition wall and temporarily fixing the upper end of the mold to the support frame and the molds directly above the lower partition wall were made to face each other. A fourth step of casting concrete inside and integrally joining the upper partition wall to the upper part of the lower partition wall, and after the completion of the first step and the second step, the third step and It is characterized in that a partition wall having a desired height is integrally constructed by repeating the fourth step.

Further, the caisson construction method according to the present invention is characterized in that the support frame uses a guide position which is provided at an appropriate position on the upper portion of the bottom slab or which is erected outside the bottom slab as a horizontal reference point. .

Further, the caisson construction formwork apparatus according to the present invention comprises a pedestal in the compartment which is in contact with the partition wall on four sides, and an elevating and detachably connected to the pedestal via an elevating jack. It is characterized in that it comprises a frame and a form frame vertically supported on the four side surfaces of the elevating frame so as to be capable of advancing and retracting via jacks for advancing and retracting.

[0011]

According to the above construction, the support frame functions as a lattice-shaped jig for positioning and fixing the upper end position of the mold. Therefore, if the lower end of each formwork is temporarily fixed to the upper side surface of the already constructed lower partition wall and the upper end is temporarily fixed to the support frame, each formwork can be accurately installed in the vertical and horizontal directions. Lateral pressure at the time of placing concrete on the form is supported by the upper and lower temporarily fixed portions and the advancing / retreating jacks, and deformation is prevented. If the temporary fixing is removed after the concrete is solidified and the advancing / retreating jack is retracted, the mold is separated from the concrete placing surface and is removed from the concrete.

The horizontal degree of the support frame can be stably obtained by using the guide post as a horizontal reference point.

The work of raising and re-installing the formwork apparatus main body is
First, a reaction force is applied to the bottom slab surface to extend the lifting jack, and each form is raised. After temporarily fixing the top and bottom of each formwork at the raised position, the lifting jack is contracted to connect the pedestal to the lower end of the jack, and this is temporarily fixed to the existing partition wall. After that, a reaction force is applied to the pedestal, and the extension and contraction of the lifting jack and the temporary fixing and removal of the form and the pedestal are alternately performed, so that the pedestal can be lifted up.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 2 show a large caisson constructed according to the present invention. FIG. 1 is a plan view and FIG. 2 is a partial sectional view. The caisson shown in the figure has an outer wall 2 that is integrally erected on the outer periphery of a bottom slab 1 that is constructed above the ground, and an inner wall that is inside the outer wall 2 and that is integrally constructed on the bottom slab 1, Square-shaped compartments A-1 to A-6, to D with 4 rows and 6 rows
-1 to D-6 (indicated by numbers A to D in the vertical direction and 1 to 6 in the horizontal direction in FIG. 1) to form a grid-like partition wall 4.

Formwork devices 5 are arranged in all the compartments inside the compartments except the compartments A-2 and D-5. Also,
A guide post 6 is erected vertically in each of the compartments A-2 and D-5. Further, the support frame 7 corresponds to the side surfaces of the outer wall 2 and the partition wall 4 in the whole of the compartments A-1 to A-6, to D-1 to D-6 on the formwork device 5. The support frames 7 are arranged in a lattice pattern and are temporarily fixed to the outer wall 2.

These support frames 7 are, for example, channel members 7A having a C-shaped cross section located on both sides of the partition wall 4,
It is composed of angle members 7B and 7B having an L-shaped cross section, which are installed on the compartments and between the channel members 7A and 7A. As shown in FIG. By providing the guide rollers 8 to the side portions of the pair of guide posts 6, the guide posts 6 are used as horizontal reference points. Further, a work scaffold is assembled between the support frames 7 and covers the entire top surface of the construction site. Here, the support frame 7 may be formed by combining the channel material or the angle material divided into a predetermined length, or by combining the plane of the caisson to be constructed into a plane shape divided into a plurality of areas in advance. You can leave it. In addition, reference numeral 7 b in FIG. 1 is a reinforcing beam arranged vertically and horizontally between the support frames 7.

As shown in detail in FIGS. 2 and 3, the formwork apparatus 5 is a box-shaped lifting unit which is detachably connected to a pedestal 9 and a central upper portion of the pedestal 9 via a lifting jack 10. A frame 11 and a frame 14 and a lifting frame 1 vertically supported so as to be able to move forward and backward through a pair of advancing and retracting jacks 12 that are parallel to the four side surfaces of the lifting frame 11.
Work scaffolds 15 and 16 fixedly arranged so as to surround the upper and lower outer peripheries of 1 and stairs (not shown) for workers to move between the work scaffolds 15 and 16 are provided.

The pedestal 9 has its upper center connected to the lower end of the lifting jack 10 when the formwork device 5 is in the raised position. The pedestal 9 extends in four directions from the seat plate 9a, which is the center of the pedestal 9. A connecting portion 9b is formed which is in contact with the four surfaces of the wall 4 and is temporarily fixed to the partition wall 4.

The stroke of the lifting jack 10 corresponds to one working height interval and is set in accordance with the height of the formwork 14. Further, the stroke of the advancing / retreating jack 12 is the amount of separation when the mold 14 is released from the mold, and the movement may be relatively small.

As shown in FIGS. 4A and 4B, each form 14 has a plurality of reinforcing ribs 14 on the back surface of the lightweight panel 14a.
b is integrated, and the lower end of the panel 14a is temporarily fixed to the constructed outer wall 2 or partition wall 4b.
The upper end of a is temporarily fixed to the facing surface of the form support metal fitting 7a which is vertically provided on the lower portion of the support frame 7. Even if the mold frame 14 is configured by the lightweight panel 14a as described above, since the lower end and the upper end thereof are temporarily fixed, sufficient rigidity can be obtained.

In the above structure, the outer wall 2 is initially formed.
The construction method according to the present invention is adopted, except that the conventional formwork method is adopted on the outer surface and the compartments A-2 and D-5. 5 to 7 show the construction procedure.

First of all, as shown in FIG.
The bottom slab 1 is detachably constructed, and then the foundation wall 2a of the outer wall 2 and the foundation wall 4a of each partition wall 4 are constructed. Each of the foundation walls 2a and 4a serves as a reference for the lower part of the mold 14 and is manufactured accurately by the conventional method.

Next, reinforcing rods for the following rods are laid on the foundation walls 2a and 4a, and as shown in FIG. 6 (a), the formwork device 5 is assembled and arranged in each compartment, and The lower ends are temporarily fixed to the upper portions of the base walls 2a and 4a. At this stage, the pedestal 9 is not attached to the formwork device 5, and the lower end of the lifting jack 10 is in direct contact with the upper surface of the bottom plate 1. In parallel with this, as shown in FIGS.
In 2 and D-5, the guide post 6 is installed.

Thereafter, the support frame 7 prepared in advance is assembled and arranged in a lattice pattern on the upper portion of the mold 14 with the guide post 6 as a reference, and the upper end of the mold 14 is temporarily fixed to the mold support fitting 7a ( (See FIG. 4). The support frame 7 is horizontal with respect to the guide post 6 and has a positioning reference,
It has a function as a jig for positioning and fixing the upper end of the mold 14 and cooperates with the foundation walls 2a and 4a to determine the construction accuracy in the in-situ construction.

After the above preparatory work, concrete is poured between the facing molds 14, and the partition wall 4b for the first rod is continuously spliced on the foundation wall 4a. Although not described for the outer wall 2 side, the same method is used for the inner surface side of the outer wall 2. After the concrete is solidified, the upper and lower temporary fixings of the mold 14 are removed, and the support frame 7 is fixed to the mold 14
When the advancing / retreating jack 12 is retracted in the state of being removed from above, the mold 14 is removed from the partition wall 4b for the first rod.

After the above work, if reinforcing bars are similarly arranged on the partition wall 4b for the first rod and the elevating jack 10 is extended, as shown in FIG. Bottom plate 1
When the reaction force is applied to the partition wall 4a, it rises, and the lower portion of the mold 14 is located above the partition wall 4b. Jack 1 for retreat in this state
2 is moved forward, the mold is brought into contact with the upper part of the partition wall 4b, then the support frame 7 is rearranged, and the upper end of the mold 14 is temporarily fixed to the metal fitting 7a. The partition wall 4c for the second rod is formed by casting concrete.

At this stage, since the lifting jack 10 is fully extended, the lifting jack 10 is pulled up while the mold 14 is fixed, and the pedestal 9 is connected to the lower end of the lifting jack 10, and the connecting portion 9b of the pedestal 9 is used as a base. If temporarily fixed to the wall 4a, FIG.
As shown in (c), the mold frame device 5 can be raised while the reaction force is applied to the pedestal 9, and the construction of the partition wall 4d for the third rod is prepared.

The above scale-like insect-like raising work and the formwork 1
If the concrete is placed while alternately repeating the temporary fixing work and the removing work of the upper and lower parts of 4, the outer wall 2 and a large number of partition walls 4 are integrated to the desired height as shown in FIG. The caisson will be obtained. In the figure, the foundation wall 2 of the outer wall by the first concrete placement
b, the work of 7 rods counting from the base wall 4b of the partition wall is repeated, and the construction is performed up to the height of the outermost wall 2h and the partition wall 4h.

Although the pair of guide posts 6 are arranged inside a predetermined compartment in the embodiment, in such a case, it is necessary to adopt the conventional construction method only inside the compartment. Therefore, if the guide post 6 is arranged outside, the method of the present invention can be applied to all the compartments. Further, the removal and rearrangement work of the support frame 7 must be disassembled and reassembled when the structure is large, but if it is slid up and down along the guide post 6, Furthermore, the work becomes easier.

[0031]

As described above in detail with reference to the embodiments, in the caisson construction method and the caisson construction formwork apparatus according to the present invention, the lower end of each formwork is connected to the already constructed lower partition wall. If temporarily fixed and the upper end is temporarily fixed to the support frame, each formwork can be accurately installed both vertically and horizontally, and the labor of adjustment can be simplified.

Further, since the lateral pressure at the time of placing concrete on the formwork is sufficiently supported, the deformation is prevented. Furthermore, when raising and re-installing the formwork device, by alternately extending and retracting the lifting jack and temporarily fixing and removing the formwork and pedestal, the formwork can be arranged while raising it like a scale insect. Compared with this, it is possible to save labor because there is no need for laying up the support beam and arranging the supporting beam and the like requiring human power.

[Brief description of drawings]

FIG. 1 is a plan view of a caisson to which the method of the present invention is applied.

FIG. 2 is a partial cross-sectional view showing a construction state of the caisson.

FIG. 3 is an exploded perspective view of the main body of the formwork apparatus.

FIG. 4 shows a fixed state of the upper end of the mold with respect to the support frame, (a) is a sectional view, and (b) is a side view.

FIG. 5 is a cross-sectional view showing a bottom plate and an outer wall and a foundation wall of a partition wall in a built state.

FIG. 6A is a partial cross-sectional view showing a state in which the formwork apparatus main body is installed on the bottom plate. (B) is a partial cross-sectional view showing a state in which the apparatus body is raised. (C) is a partial cross-sectional view showing a state where the apparatus body is further raised.

FIG. 7 is a sectional view showing a completed state of the caisson.

[Explanation of symbols]

 1 Bottom plate 2 Outer wall 4 Partition wall A-1 to A-6 to D-1 to D-6 Compartment 5 Formwork device 6 Guide post 7 Support frame 7a Formwork mounting bracket A-1 to A-6 to D-1 ~ D-6 Compartment 9 Base 10 Lifting jack 11 Lifting frame 12 Forward / backward jack 14 Formwork

Claims (3)

[Claims] 1. A caisson construction method in which a plurality of compartments are formed by constructing a partition wall for partitioning a horizontal cross section into a lattice shape on the top of a bottom slab, wherein each of the compartments has four side surfaces. A plurality of climbing type mold devices in which the molds are arranged are aligned, the lower ends of the respective molds are temporarily fixed on the bottom slab, and a grid-like support frame is arranged on the upper part of the molds. In the first step of temporarily fixing the upper end of each of the molds, concrete is placed inside the molds facing each other directly above the bottom slab, and the lower partition wall is integrally formed on the top of the bottom slab. Second step of striking together, after releasing the temporary fixing of each part, releasing each of the molds, raising the mold device and the support frame to temporarily fix, and then lowering the lower end of each mold to the lower part. Temporarily fix it to the upper end of the partition wall, and The third step of temporarily fixing to the rame, and immediately above the lower partition wall, concrete is placed inside the molds facing each other to integrally join the upper partition wall to the upper part of the lower partition wall. A fourth step, and after the completion of the first step and the second step, repeating the third step and the fourth step to integrally construct a partition wall having a desired height. Characteristic caisson construction method. 2. The caisson construction method according to claim 1, wherein the support frame uses a guide position in an upper portion of the bottom slab or a guide post standing outside the bottom slab as a horizontal reference point. . 3. A pedestal that is in contact with a partition wall on four sides in a compartment, an elevating frame that is connected to the pedestal via an elevating jack so as to be able to move up and down and detachably, and forwards and backwards to and from four side faces of the elevating frame. A formwork device for constructing a caisson, which comprises a formwork vertically supported so as to be able to move forward and backward through a jack for use in construction.