JP2003155887A - Immersion construction method of shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an immersion construction method for reducing a construction cost, having a high construction speed, having a simple coupling structure of blocks, making the minimum necessary thickness of a pipe thickness capable of enduring soil pressure and facilitating position control of a sewer pipe connection opening without leaving a steel casing. SOLUTION: In the immersion construction method of a shaft, the steel casing 2 is inserted in the insides of a plurality of connected concrete-made shaft construction blocks 1, a cutting edge 3 whose outside diameter is larger than that of the shaft construction block 1 is mounted on the lower end, the upper part of the steel casing 2 is set on a shaft excavation rotation press-in machine 4 through a cap 6, dug to be pushed into underground while rotation press-in force is applied, and after the shaft construction block 1 is put down to a prescribed position, the steel casing 2 is pulled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft used for the promotion of sewers classified as a small shaft by the Japan Sewerage Pipe Propulsion Technology Association, and a construction method for a sewer manhole, a pump room manhole, and the like. is there.

[0002]

[Conventional branch surgery] Conventionally, as a construction method of a small vertical shaft, Fig. 1
The steel method shown in FIG. 2, the concrete block settlement construction method shown in FIG. 2, the concrete block rotation press-fitting method shown in FIG.

In the steel system, while the steel casing a is pushed by rocking or rotary press-fitting, the earth and sand in the casing are excavated and discharged using a telescopic clamshell b or a dedicated excavator to a predetermined depth. Up to this point, when excavation is completed, concrete is placed on the bottom plate, and then a concrete manhole is installed inside the steel casing.However, since the steel casing is left behind, there is the drawback that it costs more. is there.

In the concrete block subsidence construction method, a concrete block d having a steel cutting edge c attached to the tip thereof is installed, and while the inside of the block is excavated by a telescopic clam shell b, the concrete block is submerged by its own weight and press-fitting device e to The expansion of the block is done by connecting the steel reinforcing band wrapped around the end of the block by welding, and sinking to a predetermined depth while adding the block, and placing the bottom concrete to stabilize the bottom part. Although it is a method of completing a vertical shaft, there are problems in the construction speed and welding joint method.

The concrete block rotary press-fitting method is a telescopic method for pressing the cylindrical precast concrete block g, which has a blade casing (steel) f connected to its tip, by using a rotary press-fitting machine h while rotating the sand in the block. It is a method of excavating and excavating using a clam shell, press-fitting to a predetermined depth while connecting the blocks by welding, and then placing bottom concrete to complete the bottom for stability, but the block needs strength. Therefore, there is a problem that the pipe thickness must be increased and that the structure of the connection portion of the block must be made strong.

[0006]

Therefore, first of all, the present invention is a method in which a steel casing is not left as in the steel method, and therefore a construction method which can reduce the construction cost.
The construction speed is faster than the concrete block settlement construction method, and the block connection structure is simple. Thirdly, the block connection structure is simpler and the pipe thickness It is a construction method that requires the minimum necessary thickness to withstand
Further, it is another object of the present invention to provide a sinking method in which the position control of the sewer pipe connection port is easy.

[0007]

The present invention has been made to solve the above problems. The first invention is to insert a steel casing inside a shaft construction block and to construct the shaft construction at the lower end thereof. Attach a blade with an outer diameter larger than the outer diameter of the block, set the upper part of the steel casing on a rotary press-fitting machine for vertical shaft excavation, press-dig into the ground by applying rotary pressure input, This is a construction method for sinking a vertical shaft, in which the steel casing is pulled out after the vertical shaft building block is sunk to the position, and this method allows the vertical shaft to be constructed at a construction speed equal to or higher than that of the conventional concrete block rotary press-fitting method. In addition to being able to build, the vertical shaft building block is not directly subjected to rotational force, so the pipe thickness can be made thinner than in the concrete block rotary press-fitting method,
Moreover, there is an advantage that the connection between the blocks does not require welding or bolt connection and is simple.

A second aspect of the present invention is a vertical shaft erection construction method, characterized in that the vertical shaft construction block and the steel casing are temporarily fixed by a connecting or connecting means until the vertical shaft is sunk to a predetermined position. According to this construction method, by providing a mark on the inner surface of the steel casing corresponding to the planned sewer connection port of the vertical shaft building block, for example, a connecting tool, the steel casing can be rotated by looking at the mark. If this is done, it is possible to easily position the sewer pipe connection port at a predetermined position, which is an excellent effect in terms of sewer pipe connection work.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Based on the embodiments shown in the drawings,
The embodiment of the present invention is as follows.

FIG. 4 is a longitudinal sectional view of a first embodiment of the present invention, in which 1 is a cylindrical concrete vertical shaft building block, 2
Is a steel unit casing, 3 is a blade opening, and 4 is a rotary press-fitting machine for shaft excavation.

In this embodiment, first, a blade opening 3 is formed at the lower end of the first unit casing 1 (the lowest unit casing in FIG. 1).
Is fixed with a tightening tool 5, and the vertical shaft building block 1 of the first stage is fitted to the outside thereof.

The outer diameter of the blade opening 3 is larger than that of the vertical shaft building block 1, and the rotary press-fitting machine 4 is provided with a chuck cap 6 which can be connected to the unit casing 2 by covering the vertical shaft building block 1. Prepare and connect with the unit casing 2.

The cap 6 is attached to the rotary press-fitting machine 4 by a gripping device 4a.
It is chucked, and is dug while applying a rotational pressure input through the cap 6, and is press-fitted into the ground. Rotation pressure input is cap 6
→ Unit casing 2 → Blade edge 3 is transmitted in this order. on the other hand,
Rotational force is not transmitted to the vertical shaft building block 1 and only the pressure input is transmitted, and a plug-in joint system can be adopted.

The shaft building block 1 also rotates with the rotation of the unit casing 2, but although not shown in the drawing, a lubricant is put between the unit casing 2 and the shaft building block 1,
It is preferable to mount a rotating roller on the outer periphery of the unit casing 2 in order to secure a gap with the vertical shaft building block 1 and reduce the load.

If it is press-fitted to a predetermined depth, it is press-fitted by adding the unit casing 2 and the vertical shaft building block 1, and when the press-fitting of a predetermined number is finished, a bottom concrete is placed at the cutting edge portion, After curing, the unit casing 2 set inside is collected.

The vertical shaft thus constructed has no damage on the inner surface of the concrete vertical shaft building block 1 (in the conventional method, the inner surface of the concrete block is damaged during the middle digging) and the finish is also beautiful. Since the structure of the concrete shaft construction block does not generate the load of the rotational force, the function for transmitting the rotational force (welding, bolt connection) is not necessary, and the function to prevent slipping out, for example, the locking pin 7 is added as shown in the figure. If this is done, the technology of the joint part between the plug-in type sewers, which has water-stopping performance and seismic resistance, can be applied.

When the inner diameter of the shaft is about 900 mm to 3000 mm, a concrete block = concrete pipe is suitable, and when it is less than 900 mm, it is possible to use, for example, a PVC pipe.

FIG. 5 is a vertical cross-sectional view of the second embodiment of the present invention. The major difference between this embodiment and the first embodiment is that the shaft construction block 1 and the unit casing 2 are inserted during rotary press-fitting. The point is that they are combined with and rotated together.

In this embodiment, the vertical shaft building block 1 and the unit casing 2 are attached to the steel band 8 wound around the outer circumference of the vertical shaft building block 1 by anchor bolts 9 and nuts 10 projecting from the inner surface of the block. It is integrated. Further, each unit casing 2 has a divided structure, and the unit casings 2 are closely connected to the inner surface of the vertical shaft building block 1 by connecting the unit casings 2 with expansion bolts 11.

However, the construction procedure of the second embodiment is carried out according to the work procedure of the first embodiment, and a detailed description thereof will be omitted here.

In the second embodiment, as compared with the first embodiment, it takes more time to integrate the vertical shaft building block 1 and the unit casing 2 and to remove it, but in actual work,
Since an electric nut rotating tool is used, it does not burden the work.

A great advantage of this integrated system is that the position of the planned hole 13 for connecting the sewer pipe 12 can be easily positioned at the time of construction. For example, in the case of the embodiment shown in FIG. 5, if the nut 10 for fixing the anchor bolt 9 is positioned at the position of the predetermined hole 13 in advance, the nut 10 is used as a mark to position the rotary press-fitting machine 4, Positioning work can be performed easily.

Here, the case where the concrete vertical shaft building block is used has been described, but it is needless to say that it can be applied to the case where the synthetic resin vertical shaft building block is used.

In the second embodiment shown in FIG. 5, the anchor bolts 9 and the nuts 10 are used as the connecting means between the vertical shaft building block and the steel casing, but as shown in FIG. A push bolt 15 to which is attached is provided on the steel casing 2 for connection, or as shown in FIG. 7, a spline joint type connection means 16 may be used.
The connection or connection means may be arbitrarily selected.

[0025]

As is apparent from the above description, according to the present invention, the following effects can be obtained. (1) In the construction method of a vertical shaft by the Nakabori method using concrete blocks, damaging the concrete blocks by giving the transmission of rotation and pressure input to the ground to the steel casing set in the concrete blocks. It is possible to give a large rotational pressure input. (2) Concrete blocks can have a simpler joint structure (insertion type joint) and thinner pipe thickness than conventional ones. (3) According to the second aspect of the invention, since the concrete block is connected to each of the steel casings, the rotational force is distributed and given, and the load is small. Moreover, positioning of the planned sewer connection hole is facilitated.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional steel system.

FIG. 2 is an explanatory view of a conventional concrete block settlement construction method.

FIG. 3 is an explanatory view of a conventional concrete block rotary press-fitting method.

FIG. 4 is a vertical cross-sectional view of the first embodiment of the present invention.

FIG. 5 is a vertical sectional view of a second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of the third embodiment of the present invention.

FIG. 7 is a vertical sectional view of a fourth embodiment of the present invention.

[Explanation of symbols]

1 Vertical shaft building block 2 unit casing 3 blades 4 rotary press-fitting machine 5 Fastener 6 caps 7 Locking pin 8 steel band 9 Anchor bolt 10 nuts 11 Expansion bolt

Claims (2)

[Claims] 1. A steel casing is inserted inside a vertical shaft building block, a lower end thereof is equipped with a blade opening having an outer diameter larger than the outer diameter of the vertical shaft building block, and the upper part of the steel casing is used for vertical shaft excavation. Set up on a rotary press-fitting machine, excavate while pressurizing and press-fitting into the ground, and then sunk the shaft building block to a predetermined position, and then pull out the steel casing. 2. A vertical shaft erection construction method, characterized in that the vertical shaft block and the steel casing are temporarily fixed by a connecting or connecting means until the vertical shaft is sunk to a predetermined position.