JPH1162227A - Trench work execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the workability and effectiveness in a mobile concrete form construction method. SOLUTION: A trench 51 is formed by excavating the ground surface 52, and the surfaces are graded, and rails 21 and 22 are laid at the bottom 51a of the trench 51 and on the ground surface on both sides of trench 51, and reinforcing bars are installed in the bottom part 51a of the trench 51 and the wall parts 51b on both sides, and a mobile concrete form 10 having an elevating/ sinking element 16 is supported movably on the rails 21 and 22. Concrete is placed in voides between the bottom plate 13 and side plates 14 and 15 of the elevating/sinking element 16 and the bottom 51a and side walls 51b of the trench 51, and when the concrete is hardened after a specified period of time, the elevating/sinking element 16 is raised and the form 10 is moved along the rails 21 and 22 so that form is separated, and a lining is constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trench forming method for forming an open trench or a pit.

[0002]

2. Description of the Related Art FIG. 6 shows an outline of a work procedure by a conventional trench construction method.

In a conventional trench construction method, first, as shown in FIG. 6A, a ground surface 101 is excavated by an open-cutting method to form a trench 102, the surface of which is leveled, and a soil layer is formed on a surface layer. Cast concrete 103. Next, as shown in FIG. 6B, a reinforcing bar 105 is formed on the bottom 104 of the trench 102.
Is placed and poured while compacting the concrete 106,
After trowel finishing, mat curing is applied. And
As shown in FIG. 6C, a reinforcing bar is provided on the side wall 107 of the trench 102.
After arranging 108 and connecting it to the reinforcing bar 105 on the bottom 104, the form member 109 is installed. Then, as shown in FIG. 6D, the concrete 111 is poured into the space between the side wall form 110 and the side wall 107 of the form member 109 while compacting. When the concrete 111 hardens after a predetermined period, the form member 109 is removed and removed from the frame, and the surface is finished. Then, as shown in FIG. 6E, the lining 112 is formed, and the trench 113 is constructed.

[0004]

The above-mentioned conventional trenching method has the following problems. That is, since the bottom portion (concrete 106) and the side wall portion (concrete 111) of the lining 112 are formed separately, the assembling of the formwork, the casting of the concrete, the curing, and the like are performed in two steps, and the construction period becomes longer. I will. The bottom (concrete 106) and side wall (concrete 11)
A seam is formed between 1) and the water stoppage is reduced. Then, the assembling work and the dismantling work of the form member 109 are repeatedly performed for every predetermined construction section in all the construction sections, and the workability is not good.

[0005] Concrete 106, 11
After casting 1, the surface needs to be trowel-finished, which is troublesome. When placing the concretes 106 and 111, it is necessary to compact the concrete 111. However, when placing the concrete 111 on the side wall 107 of the trench 102 while compacting the concrete, the space is high and narrow. In addition, there is a problem that construction failure points such as call joints and junkers are likely to occur.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a trench construction method which improves workability and work efficiency.

[0007]

According to the present invention, there is provided a method for forming a trench, comprising the steps of: excavating a ground surface to form a trench to level a surface portion; Rails are laid on the ground surface on both sides of the bottom and the trench, and reinforcing bars are arranged on the bottom and both side walls of the trench, and movably support a movable form having an elevating part on each of the rails, After casting and filling concrete in the space between the bottom part and the side part of the elevating part and the bottom part and both side walls of the trench, and after elapse of a predetermined period, the concrete is solidified, and then the elevating part is raised. The trench is constructed by removing the frame by moving the movable mold along the rails.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of a movable mold for carrying out a trench forming method according to an embodiment of the present invention, FIG. 2 is a plan view of the movable mold of the present embodiment, and FIG. FIG. 4 is a side view of the movable formwork, FIG. 4 is a schematic diagram showing an operation procedure by the trench construction method using the movable formwork of the present embodiment, and FIG.
3 shows a cross section.

As shown in FIGS. 1 to 3, in a movable mold 10 for carrying out the trench construction method of the present embodiment, a main body frame 11 has a frame shape configured to be larger than a width of a trench 51 to be formed. None, a guide frame 12 that enters the trench 51 is integrally formed below. An elevating body 16 composed of a bottom plate portion 13 and left and right side plate portions 14 and 15 is supported in the main body frame 11 so as to be able to move up and down freely. A plurality of casting holes 18 for casting concrete are formed in the bottom plate 13 and the side plates 14 and 15 of the elevating body 16.

A plurality of transfer rollers 19 and 20 are mounted on the lower portion of the guide frame 12, while a bottom 51 a of the trench 51 and a ground surface 52 on both sides of the trench 51 are provided.
Have a plurality of rails 2 along the longitudinal direction of the trench 51.
The main body frame 11 is movable along the longitudinal direction of the trench 51 because the moving rollers 19 and 20 are supported on the rails 21 and 22 so as to roll freely. I have.

The movable mold 10 can be moved on the rails 21 and 22 by a winch (not shown). The movable mold 10 is provided with a trench 51.
Own weight greater than the concrete casting pressure of
Each lifting jack 17 has a driving force that exceeds the weight of the lifting body 16 and the adhesive force of concrete.

Here, the movable mold 1 constructed as described above is used.
The trench construction method using 0 will be described.

First, as shown in FIG. 4A, a trench 51 having a bottom 51a and side walls 51b is formed by excavating a ground surface 52 at a predetermined position. Level the ground. Next, as shown in FIG. 4B, rails 21 and 22 are laid on the bottom 51a of the trench 51 and the ground surface 52 on both sides of the trench 51, respectively. In addition, the bottom 51 a and both side walls 51 of the trench 51 are formed.
The reinforcing bars 31 and 32 are arranged in b.

Then, as shown in FIG. 4C, the main body frame 11 of the movable mold 10 having the elevating body 16 is placed on each of the rails 21 and 22, and is movable via rollers 19 and 20. To support. In this state, the main body frame 11 and the elevating body 16 (the bottom plate 13, the side plates 14, 15) are positioned, and the bottom plate 13, the side plates 14, 15 and the trench 5 are positioned.
Concrete is cast and filled from each casting hole 18 into the space between the bottom 51a and the side walls 51b. This concrete has a high fluidity and is capable of self-filling,
The space between the lifting body 16 and the trench 51 is filled without gaps.

After that, when a predetermined period (usually half a day to one day) elapses and the concrete solidifies to a predetermined strength,
By driving each lifting jack 17 to contract, the lifting body 16 is moved.
To separate it from the solidified concrete. Then, the movable formwork 10 is pulled by the winch and moved along each of the rails 21 and 22 to remove the frame from the concrete, whereby the lining 53 of the trench 51 is constructed.

As described above, the lining 53 is continuously formed in the longitudinal direction of the trench 51 using the movable mold 10. As shown in FIG. 5, joints 3 are provided at predetermined intervals (length of the movable mold 10) in the longitudinal direction of the trench 51.
The joint 3 is used as a seal member when concrete is poured. Since the reinforcing bar 31 penetrates the joint 33, the reinforcing bar 31 is arranged in advance before the reinforcing bar 31 is provided. In addition, by applying a release agent in advance to the bottom surface of the bottom plate 13 and the lower surfaces of the side plates 14 and 15 of the elevating body 16, removal of the frame is facilitated.

The trench construction method of this embodiment using the movable mold 10 has the following effects.

Since the movable form 10 is freely movable along the rails 21 and 22, there is no need to assemble or disassemble the movable form 10 for each concrete casting. Self-filling becomes possible by the application of high-fluidity concrete, compaction becomes unnecessary, and a solid lining 5
3 can be constructed. Since concrete is poured into the bottom 51a and both side walls 51b of the trench 51 at the same time, the construction speed is increased and no splicing occurs. Since the pair of rails 21 is laid on the bottom 51 a of the trench 51, the concrete placing pressure of each side wall 51 b of the trench 51 does not act on the bottom 51 a, and this bottom 51 a
This eliminates the need to pressurize the concrete and reduces buoyancy. Further, since the rail 21 of the bottom 51a is left in the concrete, the tensile strength of the lining 53 in the longitudinal direction is improved. If the ground on which the trench is constructed is good, the concrete can be poured directly into the surface of the trench 51 without using the soil concrete. The surface finish of the concrete casting surface can be eliminated.

[0020]

As described above in detail in the embodiments, according to the trench construction method of the present invention, a trench is formed by excavating the ground surface to level the surface, and the bottom of the trench and the trench are formed. A rail is laid on the ground surface on both sides of the rail, and reinforcing bars are arranged on the bottom and both side walls of the trench, and a movable form having a lifting part on each rail is movably supported, and a bottom part of the lifting part is provided. And concrete is poured and filled in the space between the side surface and the bottom of the trench and both side walls, and after a predetermined period of time, after the concrete has solidified, the elevating part is raised, and then the movable formwork is moved along each rail. Since the trench is constructed by removing the frame by moving, the work is performed by moving the movable form every time concrete is cast, and the assembly and dismantling of the movable form can be unnecessary. Along with The concrete bottom and the side walls are cast at the same time, and the construction speed is increased and splicing occurs.However, a solid lining can be achieved, improving the workability and work efficiency of trench construction work. Can be planned.

[Brief description of the drawings]

FIG. 1 is a front view of a movable mold for carrying out a trench construction method according to an embodiment of the present invention.

FIG. 2 is a plan view of the movable formwork of the present embodiment.

FIG. 3 is a side view of the movable formwork of the present embodiment.

FIG. 4 is a schematic view of an operation procedure by a trench construction method using a movable mold according to the present embodiment.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a schematic view of an operation procedure according to a conventional trench construction method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 movable mold 11 main body frame 12 guide frame 13 bottom plate portion 14, 15 side plate portion 16 elevating body 17 elevating jack 18 driving hole 19, 20 roller 21, 22 rail 31, 32 reinforcing bar 33 joint 51 51 trench 51 a bottom 51 b side wall 52 Ground surface 53 lining

Claims (1)

[Claims] A trench is formed by excavating the ground surface to level the surface, a rail is laid on the bottom of the excavated trench and on the ground surface on both sides of the trench, and the bottom of the trench is formed. And arranging reinforcing bars on both side walls,
A movable form having an elevating part is movably supported on each of the rails, and concrete is poured and filled into a space between a bottom part and a side part of the elevating part and a bottom part and both side walls of the trench. After a period of time, after the concrete is solidified, the elevating section is raised, and then the movable form is moved along each of the rails to remove the frame to form a trench. .