JP2002054118A - Large-assembly formwork method for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct the suspension works of forms by a comparatively small- scale crane, and to assemble the forms without a separator when the lower concrete or the like of revetment is constructed in a cast-in-place manner by a form movement system in ocean construction works or the like. SOLUTION: When the lower concrete or the like of the revetment is built by alternately repeating the placing of concrete into a space formed of the placing-joint end face of a preceding block 5a and forms 10 having a U shape in plan view installed onto a foundation surface and movement to the next positions of placing of the forms 10, the forms 10 are constituted by three division into a pair of side frames 11 and an end frame 12, a lower frame 13 is mounted on the foundation surface at the place of the placing of concrete, the lower end sections of a pair of the side frames and the end frame are fixed onto the lower frame 13 respectively, the upper end sections of a pair of the side frames and the end frame are connected and unified to an upper frame, concrete is placed into a space surrounded by these side frames and end frame, concrete is cured, and the upper frame and the end frame are removed and a pair of the side frames are moved to the next positions of placing respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-frame formwork method used when a concrete structure such as a revetment is cast in place by a form-moving method.

[0002]

2. Description of the Related Art As shown in FIG.
, A straight pile type pier type quay 1 on which a ship berths on the sea side, and a rubble slope 2 with a revetment 3 on its back
And the space on the land side of the sloped dike 2 is used as a treatment plant or the like.

The revetment 3 may be composed of an upper concrete 4 and a lower concrete 5, the lower concrete 5 may be composed of a block (two steps), and the upper concrete 4 may be cast-in-place concrete. In view of the construction conditions at the site, the block must be installed over the temporary gantry 1b of the quay 1 in the middle of construction, and a large hoist ship (for example, a 360-t suspension) is required. Also, because it competes with the input and leveling of rubble and covering stones,
It is expected that both construction cost and construction period will be severe.

[0004] Therefore, in the above sea construction, it is desirable to adopt a cast-in-place concrete method for the construction of the lower concrete 5 of the revetment 3. In this cast-in-place concrete method, as shown in FIG. 5, a steel form 50 having a U-shape in plan view is assembled to a joint portion of a preceding cast concrete block 5a, and is surrounded by the form 50 and the preceding block 5a. Is a method of casting concrete in a space where the concrete has hardened, moving the formwork 50 to the next casting position when the concrete has hardened, and sequentially repeating these steps to build a concrete structure continuous in the longitudinal direction. In the formwork 50, the middle part of the pair of left and right side frames 51, 51 whose base ends are fixed to the side face of the joint part of the preceding block 5 a is connected and integrated by a separator 53, and is attached to the tip of the side frames 51, 51. Wife frame 52 attached
Is fixed to the preceding block 5a by the separator 54.

[0005]

In the case of the above-mentioned conventional method (a frame using a separator), there are the following problems.

(1) In the case of sea construction, weather and sea conditions greatly affect the work. In order to suppress this effect as much as possible, it is necessary to assemble a formwork with a separator on land and hang it with a hoist ship or the like, which increases the size of the hoist ship or the like.

(2) Since the mold is suspended in a U-shape in plan view, a large number of steel materials for maintaining the shape are required in addition to attaching the separator.

(3) When the frame is removed, the assembly starts from the beginning,
Work efficiency is poor because the formwork cannot be slid.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a relatively small-sized construction for casting concrete at the lower part of a revetment in a sea construction by a form moving method. It is an object of the present invention to provide a large-frame formwork method for a concrete structure that allows a formwork to be hung by a hoist and can be assembled without a separator.

[0010]

SUMMARY OF THE INVENTION A large-frame formwork method for a concrete structure according to the present invention comprises a joint end face of a preceding cast concrete block and a U-shaped formwork installed on a foundation surface. In the construction method of constructing a concrete structure that is continuous in the longitudinal direction by alternately repeating the casting of concrete into the space to be made and the movement of the formwork to the next casting position,
The formwork is divided into a pair of side frames and a pair of side frames, and a lower frame is installed on the foundation surface at the concrete casting position, and the lower ends of the pair of side frames and the side frame are fixed to the lower frame. Then, the upper ends of the pair of side frames and the end frame are connected and integrated with the upper frame, concrete is poured into the space surrounded by the side frame and the end frame, and after the concrete is hardened, the upper frame and the end frame are joined. It is characterized in that the pair of side frames are removed and moved to the next casting position.

It is preferable to set and move the formwork as follows. That is, a pair of side frames is first installed on the sea side (stay side) at the concrete casting position, and fixed to the lower frame with a pair of members sandwiching the lower end from both sides, and the upper end thereof It is connected to the steel pipe column of the quay in the front via a connecting material, and it is made independent. Next, land side (processing plant side)
Is set at the concrete casting position, and the lower end thereof is fixed to the lower frame in the same manner as described above, and the upper end thereof is temporarily connected and fixed to the sea-side side frame with a temporary connecting member. Thereafter, the upper frame is placed, and the upper ends of both side frames are connected and integrated.
Next, the wife frames temporarily placed on the land are installed on the front surfaces of the both side frames, and the lower ends thereof are fixed to the lower frame in the same manner as described above, and the upper ends thereof are connected and fixed to the upper frame.
In removing the frame, after removing the upper frame, the wife frame is first removed by a crane and temporarily placed on land, and then a pair of side frames are slid by a crane.

When casting concrete, since the formwork is an underwater formwork, underwater concrete is used in the lower part and aerial concrete is used in the upper part. Further, in order to reduce the amount of underwater concrete to be poured, a water-expandable sealing material is attached to the four corners of the space formed by the joint end face of the preceding block and the U-shaped formwork in plan view to stop. By watering and draining, the water level inside the mold is made lower than the water level outside the mold.

[0013] In the above configuration, in order to divide the formwork into a pair of side frames and a wife frame, the work of suspending the formwork (assembling and assembling the formwork) using a small crane installed on a temporary gantry on the quay.
Unframed / moved). In addition, since the lower end and the top end of the formwork are connected and integrated by the lower frame and the upper frame, the separator of the conventional method is not required, the work efficiency is improved, the underwater work is shortened, and the safety is improved. Furthermore, since it is a split type without a separator, it is easy to remove the mold, and the mold can be slid.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on one embodiment shown in the drawings. This embodiment is an example in which the present invention is applied to lower concrete of a revetment of a rubble-type sloped levee constructed close to a straight pile type pier type quay wall in marine construction.
1 and 2 are a plan view and a cross-sectional view, respectively, showing an example of a movable formwork for carrying out the large-form formwork method of the present invention. FIG.
Is a construction flow of the present invention. FIG. 4 shows an example of a quay and a seawall to which the present invention is applied.

As shown in FIGS. 4 (a) and 4 (b), when a quay 1 of a straight pile type horizontal pier type is constructed on the sea side and a rubble type sloped dike 2 having a revetment 3 is constructed on the back thereof. As shown in FIG. 4C, in parallel with the construction of the quay 1, the lower concrete 5 of the revetment 3 is constructed on the rubble slope 2 in the sea. Seawall 3
The lower concrete 5 is divided into a number of spans as shown in FIG. 4 (a), and the lower concrete 5 is cast in place using the movable formwork 10 of the present invention shown in FIGS. It is built sequentially for each span.

As shown in FIG. 1, the movable formwork 10 is a U-shaped formwork in plan view that forms a concrete casting space for one span together with the joint end face of the preceding concrete block 5a. In the invention, a pair of left and right steel side frames 11,
By dividing it into three parts 11 and a steel frame 12, FIG.
A small crawler crane (for example, hanging 50 tons) from the temporary gantry 1b of the pier 1 of the straight pile type horizontal pier type in the middle of construction
The work of hanging the formwork (assembly, removal of the frame, and movement) can be performed by using the moving formwork 10 as shown in FIG.
The lower end and the top end are connected and integrated by the lower frame 13 and the upper frame 14, so that the separator of the conventional method is not required.

As shown in FIG. 1 and FIG. 2, the side frame 11 has an outer side of a steel side plate 11a and a vertical member 11b of H-section steel and a channel steel.
It is reinforced with a horizontal member 11c of H-section steel. Wife frame 1
Similarly to the side frame 11, 2 is also composed of the end plate 12a, the vertical member 12b, and the horizontal member 12c (see FIG. 2).

As shown in FIGS. 1 and 2, the lower frame 13 is a frame body fixed on the foundation surface at the concrete casting position and fixing the lower end of the movable formwork 10, and is parallel to the seawall width direction. Steel flat plate (flat bar) 13a which is arranged at intervals in the seawall longitudinal direction, and this flat plate 13a
A pair of L-shaped steel fixing members 13 fixed on both ends of the pair of side frames 11, and preventing the inward movement of the lower ends of the pair of side frames 11, 11.
b, 13b, and an L-shaped steel fixing member 13c (see FIG. 1) for connecting the front ends of the fixing members 13b, 13b on the end of the end frame to prevent the inward movement of the lower end of the end frame 12. L-shaped steel connecting member 1 for connecting the base ends of the fixing members 13b, 13b on the side opposite to the end frame and abutting against the end face of the preceding block 5a
3d (see FIG. 1).

The fixing member 13b of the side frame 11 also functions as a member for connecting and integrating the plurality of flat plates 13a, and is arranged in accordance with the seawall width to position the side frame 11. The fixing member 13c and the connecting member 13d of the wife frame 12 together with the pair of fixing members 13b, 13b of the side frame 11 constitute a rectangular frame in plan view, thereby setting a concrete casting space for one span. . The fixing member 13c positions the end frame 12.

The flat plate 13a has a length such that it protrudes outward from the side frame 11, and a pressing member 16 and a fastening member 17 made of an H-shaped steel are provided on the protruding portion via a mounting table 15. The tightening member 17 is a kind of vise for moving the pressing plate forward and backward by a screw, and presses the clamping member 16 placed on the installation table 15 against the side frame 11. The lower end of the side frame 11 is sandwiched between the fixing member 13 b and the pressing member 16, and is firmly fixed to the lower frame 13.

As shown in FIG. 1, the lower end of the end frame 12 is fixed to the lower frame 13 by an L-shaped steel fixing member 13c and an H-shaped steel pressing member 18. That is, after the side frame 11 is fixed, both end portions of the clamping member 18 in the seawall width direction are placed on the tip portions of the pair of clamping members 16, 16, and
Is fixed by connecting the upper surface of the front end portion and the side surface of the end portion of the pressure member 18 with a turnbuckle 19 and pulling the pressure member 18 toward the side frame. Further, for the purpose of reinforcement, a fastening member 20 similar to the fastening member 17 of the side frame is provided to
8 is pressed toward the wife frame side.

The lower frame 13 is buried in the concrete to be cast, and fixing members such as the clamping member 16 and the fastening member 17 are removed and diverted to the next span.

The upper frame 14 is a frame that is mounted on the movable frame 10 and connects and integrates the upper ends of the side frame 11 and the end frame 12. It is reinforced with a member and a corner diagonal member (see FIG. 2, not shown in FIG. 1). The upper frame 14 has such a size as to protrude outward from the side frame 11 and the end frame 12 in plan view, and has a fastening member 22 similar to the fastening member 17 below the frame member 21 as shown in FIG. The side frame 11 and the end frame 12 are pressed inward by the fastening member 22, and the upper ends of the side frame 11 and the end frame 12 are connected and integrated, and can be opposed to the concrete side pressure to be poured. .

As shown in FIG. 1, the side plate 11a of the side frame 11
Is extended so as to come into contact with the side surface of the joint portion of the preceding block 5a, and this extended portion is fixed by a buried bolt 23 and a nut 24 embedded in the side surface. Further, it is preferable that the upper end of the side frame 11 on the sea side (stay side) is connected to the steel pipe pile 1a of the straight pile type pier 1 on the front surface using a connecting material, and is reinforced.

As for the concrete casting, since the assembled movable form 10 is an underwater form, as shown in FIG. 2, the lower part is an underwater (non-separable) concrete 25, and the upper part is an aerial concrete 26. Here, the joint between the side frame 11 and the end frame 12, the preceding block 5a and the side frame 1 are used in order to minimize the amount of the underwater concrete poured and to reduce the cost.
A water-swellable sealing material 27 is adhered to the joint 1 to stop the water, and the inside of the mold is drained by a pump.
Aerial concrete can be cast from about (1 m higher outside the formwork).

Using the movable form 10 having the above structure,
The lower concrete 5 of the revetment 3 is constructed by the following procedure (refer to the construction flow of FIGS. 1, 2 and 3).

(1) From the state where the leveling work of the rubble 30 of the rubble-type inclined levee 2 is completed, crushed crushed stones are put on the foundation to adjust the level. A wire mesh 31 is laid thereon to prevent underwater concrete from biting.

(2) The lower frame 13 is manufactured on land. The manufactured lower frame 13 is set on the wire mesh 31 at the next casting position while checking the normal and horizontal level.

(3) The wife frame 12 on the joint surface of the preceding block 5a is preliminarily removed by a crawler crane or the like on the temporary gantry 1b and is temporarily placed on land.

(4) The seaside (stay side) side frame 11 on the side surface of the preceding block 5a is moved by a crawler crane or the like, and is set at the next casting position. The lower end of the side frame 11 is sandwiched between the fixing member 13 b of the lower frame 13 and the pressing member 16, and tightened and fixed by the tightening member 17. The upper end of the side frame 11 is connected to the steel pipe pile 1a of the quay 1 at the front using a connecting material, and the side frame 11 is made to stand by itself.

(5) The side frame 11 on the mountain side (processing site side) on the side surface of the preceding block 5a is moved by a crawler crane or the like, and set at the next casting position. The lower end of the side frame 11 is fixed similarly to the side frame 11 on the staying side. In addition, the upper end is temporarily connected to and fixed to the side frame 11 on the side of the anchorage, which is free standing, using a temporary connection material. In addition, the preceding block 5
The joint with a is fixed by the embedded bolt 23 and the nut 24.

(6) When the setting of the both-side frames 11, 11 is completed, the upper frame 14 is placed thereon, and the both-side frames 11, 11 are set.
The upper end portions 11 are connected and fixed to each other by a fastening member 22, and integrated.

(7) Finally, the wife frame 12 temporarily placed on land
Is installed. The lower end of the wife frame 12 has a turnbuckle 19
Then, the fixing member 13c and the pressing member 18 are sandwiched between the fixing member 13 and the fixing member 13c.
The upper end is connected and fixed to the upper frame 14.

(8) Underwater concrete is poured into the lower part of the space surrounded by the pair of side frames 11, 11 and the end frame 12, using the concrete placing scaffold 32 installed on the upper frame.

(9) The joint processing of the underwater concrete upper surface is performed. (10) Pour aerial cocrete on underwater concrete.

(11) After curing of the concrete, the upper frame 14 is removed, the equipment for fixing the lower frame 13 is removed, and the process returns to (1) the crushed stone input / wire laying step.

By repeating the above steps sequentially for each span, the lower concrete 5 of the revetment 1 is constructed.

Although the above description has been given of the construction on the concrete below the revetment, the present invention is not limited to this, and the present invention can be applied to the construction of a concrete structure in port construction or the like.

[0039]

Since the present invention has the above-described configuration, the following effects can be obtained.

(1) In order to divide the formwork into a pair of side frames and a wife frame, the formwork must be suspended (assembled, removed, and moved) by a small crane installed on a temporary gantry on the quay. And cost can be reduced.

(2) Since the lower end and the top end of the formwork are connected and integrated by the lower frame and the upper frame, the separator of the conventional construction method is not required, thereby improving work efficiency, shortening underwater work, and improving safety. I do.

(3) Since it is a split type without a separator,
The removal of the formwork becomes easy, the formwork can be slid, and the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a plan view showing one example of a movable formwork used for carrying out a large-frame formwork method for a concrete structure according to the present invention.

FIG. 2 is a cross-sectional view of the movable mold shown in FIG.

FIG. 3 is a view showing a processing flow of a large-frame formwork method for a concrete structure according to the present invention.

4 shows an example of a quay and a seawall to which the present invention is applied, (a) is a plan view, (b) is a cross-sectional view, and (c) is a cross-sectional view during construction.

FIG. 5 is a plan view showing a movable mold formed by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Straight pier type pier type pier 1a ... Steel pipe pile 1b ... Temporary gantry 2 ... Ripple type sloping embankment 3 ... Revetment 4 ... Upper concrete 5 ... Lower concrete 5a ... Precast concrete block 10 ... Moving formwork 11 ... Side Frame 11a ... side plate 11b ... vertical member 11c ... horizontal member 12 ... wife frame 12a ... wife plate 12b ... vertical member 12c ... horizontal member 13 ... lower frame 13a ... flat plate 13b ... fixing member 13c ... fixing member 13d ... connecting member 14 ... upper frame Reference Signs List 15 installation table 16 clamping member 17 clamping member 18 clamping member 19 turnbuckle 20 clamping member 21 frame member 22 clamping member 23 embedded bolt 24 nut 25 underwater concrete 26 aerial concrete 27: water-swellable sealing material 30: basic rubble 31: wire mesh 32: scaffolding during concrete casting

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takafumi Yoshihara 1-2-7 Moto-Akasaka, Minato-ku, Tokyo F-term (reference) 2D018 BA00

Claims (1)

[Claims] 1. A concrete casting into a space formed by a joint end face of a preceding casting concrete block and a U-shaped mold installed on a foundation surface, and a subsequent casting of a mold. In the construction method of constructing a concrete structure that is continuous in the longitudinal direction by alternately repeating the movement to the position, the formwork is divided into a pair of side frames and a pair of side frames, and the formwork is divided into three parts, and the concrete form is placed on the foundation surface at the concrete placing position. The lower frame is installed on the lower frame, the lower ends of the pair of side frames and the wife frame are fixed to the lower frame, and the upper ends of the pair of side frames and the wife frame are connected and integrated by the upper frame. A large group of concrete structures, wherein concrete is poured into the space surrounded by, and after the concrete has hardened, the upper frame and the end frame are removed and the pair of side frames are respectively moved to the next placement position. Type Method.