JPH06117176A - Settlement shaft common to manhole, its construction and cylindrical settlement shaft block - Google Patents

Abstract

PURPOSE:To provide an economical and rational settlement shaft which has a good workability suitable for application of a small diametral propulsive pipe and does not hinder traffic. CONSTITUTION:An installation area of a vertical shaft is excavated to set a cutting block 1 and a cylindrical settlement 2 is jointed thereon. The inside is excavated while the upper cylindrical recessed blocks are jointed by turns, to reach a specified depth. A temporarily soil-retaining member 3 is placed on the uppermost cylindrical settlement block 2 to make a vertical shaft for application of propulsive pipes. After the propulsive pipes are completely laid down, a floor slab block 4 having a specified opening 4a is placed on the uppermost cylindrical settlement block 2. A block 5 for manhole is erected on the opening 4a and filled back at the periphery to use as a manhole.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is used in a small-diameter propulsion method as a vertical shaft when constructing sewer pipes and other various pipes, and also as a manhole after completion of propulsion. The present invention relates to a construction method and a cylindrical sunk block for a vertical shaft.

[0002]

2. Description of the Related Art A propulsion method is widely used as a method for constructing various pipes such as sewer pipes without cutting. In particular, in the current situation where the trunk environment has been almost maintained due to the spread of sewers, etc., the stage of surface maintenance using small diameter pipes is entered, and for example, construction of small diameter pipes with a diameter of 200 to 400 mm accounts for a considerable proportion. is there.

On the other hand, conventionally, when a small-diameter pipe is constructed by the propulsion method, the horizontal section of the starting shaft is 5 m × 2.5.
A vertical shaft of about m is constructed by using sheet piles, angry and temporary earth retaining materials such as cuts, and a propulsion device equipped with jacks and reaction walls is installed in this starting vertical shaft, and a small diameter as a propulsion pipe is successively installed. A method is adopted in which a pipe is hung down and connected, and a propulsion device press-fits it into the ground. After the completion of the propulsion work, a manhole for inspection is built in the shaft and the excavated part is backfilled.

[0004]

In the conventional shaft construction method, the work of installing the temporary earth retaining material is complicated, and after the construction of the small diameter pipe by the propulsion method is completed, a manhole is separately built in the shaft. , Construction costs are wasted. In addition, the large excavation space is a major obstacle to traffic.

In particular, when a fume tube having a diameter of about 200 to 400 mm is used as a small diameter propulsion tube, a tube length of about 1 m is preferable from the ratio of the diameter of the tube to the length of the tube. By downsizing the equipment and devising vertical shaft equipment, it is possible to reduce the vertical shaft space and improve construction efficiency.

The present invention was developed under the circumstances as described above, has good workability suitable for the construction of small-diameter propulsion pipes, is economical in that it does not obstruct traffic without taking up space. The purpose of the present invention is to provide a rational manhole-combined sinking pit, its construction method, and a tubular sinking block for a vertical shaft.

[0007]

The manhole-combined sinking pit according to the present invention comprises a plurality of tubular sinking blocks, a floor slab block and one or more manhole blocks.

The cylindrical depositing block has a diameter necessary for a starting shaft of the propulsion method, and is successively deposited vertically to a predetermined depth. The digging can be carried out in the same manner as the digging work of a normal open caisson, and the inside is excavated by manpower or using an excavating machine such as a clam shell while sequentially connecting the upper cylindrical laid blocks. At the time of propulsion work, a space is required as a vertical shaft for installing a propulsion device, hanging down a propulsion pipe, etc., and temporary earth retention material, etc. is installed on the uppermost cylindrical submerged block. Although the cylindrical submerged block having a circular cross section is advantageous in terms of stress, it is not limited to the circular cross section and may have an elliptical or polygonal cross section.

The floor slab is to be installed on the uppermost cylindrical submerged block after the completion of the propulsion work of the small diameter propulsion pipe, and the manhole has an opening having a required diameter. . The depth of the floor slab is determined in consideration of the installation space for telephone lines, gas pipes and other buried objects in the vicinity of the ground surface, and is usually about 2 m from the ground surface.

The manhole block constitutes the upper part of the manhole and is connected to the opening of the floor slab and stands up to the ground surface. The area around the manhole block is backfilled and can be used as an installation space for other buried objects. As a result, the upper part has the same diameter as a normal manhole, and a manhole having a wide space is formed in the lower part by the cylindrical deposit block.

The method for constructing the manhole-combined sinking pit according to the present invention is as follows:
First, excavate the ground surface at the vertical shaft installation position to a predetermined depth, install the lowermost cylindrical sunk block, and then sequentially dig the inside while connecting the upper cylindrical sunk blocks, and sew the cylindrical sunk block to a predetermined depth. Sink down. The cylindrical sinking block should be set to the floor slab block installation depth, and when constructing the propulsion pipe,
A temporary earth retaining material will be installed on the uppermost cylindrical sunk block to form a shaft for propulsion pipe construction. After constructing the propulsion pipe using the vertical shaft, install the floor slab block, connect the manhole block to the opening of the floor slab block, start up to the ground surface, and refill the outside of the manhole block.

[0012] In order to bury the cylindrical submerged block, the lowermost cylindrical submerged block is usually installed on a blade having a slightly larger diameter. To cut the friction, the workability can be improved by injecting a self-hardening lubricant into the outer surface of the cylindrical deposit block. The self-hardening lubricant can be injected from a lubricant injection hole provided from the inner surface side to the outer surface side of the cylindrical deposit block. After being deposited to a predetermined depth, the self-hardening lubricant is 2 to
It hardens in about 5 days and becomes integrated with the ground. As such a self-hardening lubricant, a setting retarder used for shield backfill injection, for example, trade name SP-A (Shimadzu Industrial Machinery), trade name Clean Back Stabilizer (Tachibana Shokai), or the like can be used.

Further, in the cylindrical sunk block for a vertical shaft of the present invention, the lubricant injection hole is provided from the inner surface side to the outer surface side of the cylindrical sunk block, and the lubricant guide groove continuous with the lubricant injection hole is provided on the outer surface. The lubricant injected from the lubricant injection hole is spread over almost the entire outer surface of the block to enable smooth construction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment will be described below.

FIG. 1 shows an embodiment of a sinkhole which also serves as a manhole according to the present invention, in which a cylindrical tubular sink block 2 is connected to a ring-shaped blade block block 3 in about 3 to 5 stages. A cylindrical temporary earth retaining material 3 assembled in a cylindrical shape is installed on the outer periphery of the upper part thereof to form a shaft for propulsion construction. However, FIG. 1 shows a state in which the propulsion construction has been completed and the manhole has been constructed, and the opening 4 is formed on the uppermost cylindrical deposit block 2.
The floor slab block 4 formed by eccentric a is installed, and the manhole block 5 continuous with the opening 4a is provided on the floor block 4.
Stacked. In the figure, reference numeral 15 is a cast-in-place base concrete, and 16 is a propulsion pipe starting port formed in the lowermost cylindrical deposit block 2. The propulsion pipe starting port 16 is closed and placed when it is sunk. When the propulsion construction is performed again in a different direction, the side surface of the cylindrical submerged block 2 may be perforated with a core cutter or the like.

Referring to FIGS. 2 (a) and 2 (b), an example of the dimensions of the cylindrical submerged block 2 is as follows: a precast concrete block having an outer diameter of 2350 mm, an inner diameter of 2000 mm and a height of 1000 mm, and a width of 150 mm. The steel reinforcing ring 6 is attached to the lubricant guide groove 8a having a width of 30 mm and extending in the circumferential direction, and the lubricant guide groove 8b having a width of 30 mm is branched at a central angle of 15 °. . In the figure, 7 is a lubricant injection hole, and 9 is an embedding nut for attaching a hanging metal fitting of a block.

FIG. 3 shows an example of a connecting portion between the blade block 1 and the lowermost cylindrical sink block 2. The blade block 1 in this embodiment is made by filling concrete 1b into a steel member 1a assembled in a ring shape,
The inner diameter is the same as the inner diameter of the cylindrical sink block 2, the outer diameter is slightly larger than the outer diameter of the cylindrical sink block 2, and a guide portion 1c for receiving the cylindrical sink block 2 is formed. In the figure, 10 is a joint filled with mortar, and 11 is a sealing material.

FIG. 4 shows an example of a connecting portion between the upper and lower cylindrical submerged blocks 2. The reinforcing rings 6 are joined together by welding 12 on the outer surface side and the joint 10 filled with mortar is formed on the inner surface side. The sealing material 11 is formed on the contact surface between the concretes. 1 in the figure
3 is an anchor bar for integrating the reinforcing ring 5 with the concrete part.

FIG. 5 shows an example of the lubricant injection hole 7 that opens at the lower part of the cylindrical submerged block 2 (see FIG. 2B) toward the lubricant guide groove 8a in the circumferential direction. This lubricant injection hole 7 consists of a steel socket 7a embedded in the concrete of the cylindrical submerged block 2, has a plug 7b on the inner surface of the cylindrical submerged block 2, and has a check valve 7c on the outer surface thereof. The injection pipe is connected to the plug 7b, and the lubricant is sent out in the direction of the arrow in the figure.

FIG. 6 shows an example of the installation state of the temporary earth retaining material 3 and the floor slab block 4 on the uppermost cylindrical deposit block 2. In this embodiment, the temporary earth retaining material 3 is made of a steel member, and the cylinder is multi-divided (for example, 4 divisions).
A cylindrical earth retaining wall is formed by having the above-mentioned shape and joining each other with bolts or the like. In the figure, 14 is a bolt hole for joining bolts. The temporary earth retaining material 3 can be extracted and diverted after the construction.

FIG. 7 shows an example of the form of the floor slab block 4. The floor slab block 4 is installed after the completion of the propulsion construction by the vertical shaft, and has a function as a lid of the cylindrical sinking block 2 and a function as a manhole passage by the opening 4a.

Next, the construction procedure in the present invention will be described.

FIGS. 8 (a) to 8 (c) show an example of a shaft construction procedure according to the present invention. The procedure is as follows.

(1) Measurement of the sunk position (2) Pavement removal at the sunk position (3) Excavation to a depth where it can stand on its own (see Fig. 8 (a)) (4) Installation of blade ring 1 (5) Installation and welding of the cylindrical submerged block 2 (6) Assembly of lubricant injection equipment (7) Excavation in the cylindrical submerged block 2 and subsidence while injecting lubricant (8) Cylindrical submerged block corresponding to the planned submerged depth After stacking two, install temporary earth retaining material 3 (see Fig. 8 (b)) (9) Sink while excavating and injecting lubricant (10) Flooring and ground stone crushing (11) Placing base concrete 15 (See FIG. 8 (c)).

FIGS. 9 (a) to 9 (c) show an example of a manhole construction procedure after completion of the propulsion construction in the present invention, and the work is performed in the following procedure.

(1) Installation of the floor slab block 4 (see FIG. 9 (a)) (2) Startup of the manhole block 5 on the floor slab block 4 (see FIG. 9 (b)) (3) Backfilling ( Fig. 9 (c)), withdrawal of temporary soil retaining material 3 and restoration of pavement.

[0027]

[Effects of the Invention] By constructing a vertical shaft with a cylindrical sunk block that also has a rigidity necessary for itself as a manhole, the space for the starting vertical shaft can be reduced to about 1/3 of the conventional one, and the traffic volume is high. Good for roads with bad construction conditions.

Since it is a sunk method, there is no noise and vibration in the conventional shaft construction work.

After the completion of the propulsion work of the propulsion pipe, the space formed by the cylindrical submerged block used as the starting shaft is used for inspection work together with the floor slab block and the manhole block installed on the tubular submerged block. Can be used as a manhole.

Since it is not necessary to separately build a manhole after the completion of the propulsion work, the construction can be speeded up.

The upper part of the manhole is kept to a minimum necessary diameter to backfill the surroundings, leaving a space for laying other buried objects such as telephone lines and gas pipes, while a lower part has a large space corresponding to the launch shaft of the propulsion pipe. Since it is stored, a large space can be secured for maintenance work after the start of use, and the work becomes easy.

When it is necessary to increase the number of pipes, without repeating the construction of the shaft again, only the upper part is excavated and the manhole block, floor slab block, etc. are removed, and the settling pit is used again as a starting shaft. be able to.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an outline of a sinking pit according to an embodiment of the present invention.

FIG. 2 shows an example of a cylindrical submerged block, (a)
Is a plan view and (b) is a front view.

FIG. 3 is a vertical cross-sectional view showing an example of a connecting portion between a blade block and a lowermost cylindrical sink block.

FIG. 4 is a vertical cross-sectional view showing an example of a connecting portion between upper and lower cylindrical submerged blocks.

FIG. 5 is a vertical sectional view showing an example of a lubricant injection hole.

FIG. 6 shows an example of the installation state of the temporary earth retention material and the floor slab block with respect to the uppermost cylindrical sunk block,
(a) is a horizontal sectional view and (b) is a vertical sectional view.

FIG. 7 shows an example of the form of a floor slab,
(a) is a plan view and (b) is a front view.

8 (a) to (c) are vertical cross-sectional views showing an example of a shaft construction procedure in the present invention.

9A to 9C are vertical cross-sectional views showing an example of a manhole construction procedure after completion of propulsion construction in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Blade block, 2 ... Cylindrical sink block, 3 ... Temporary earth retaining material, 4 ... Floor block, 4a ... Opening part, 5 ... Manhole block, 6 ... Steel reinforcement ring, 7 ... Lubricant injection hole,
8a, 8b ... Lubricant guide groove, 9 ... Embedded nut, 10 ... Joint, 11 ... Sealing material, 12 ... Welding, 13 ... Anchor bar,
14 ... Bolt hole, 15 ... Cast-in-place concrete, 1
6 ... Propulsion tube start

Claims (4)

[Claims] 1. A plurality of cylindrical submerged blocks which are vertically connected and are sunk to a predetermined depth, and an opening having a required diameter which is installed above the uppermost tubular submerged block of the cylindrical submerged blocks. A manhole-combined sinking pit, comprising a floor slab and a manhole block connected to the opening and raised up to the ground surface. 2. The bottom surface of the shaft at the vertical shaft is excavated to a required depth to install the lowermost cylindrical sunk block, and the uppermost cylindrical sunk block is sequentially connected to dig the inside to form the cylindrical sunk block. It is sunk to a predetermined depth, and a temporary earth retaining material is installed on the cylindrical sunk block to build a shaft for propulsion pipe construction.
After constructing a propulsion pipe using the vertical shaft, install a floor slab block having an opening of a required diameter on the cylindrical submerged block, and install a manhole block on the opening to stand up to the ground surface. The method for constructing a manhole-combined sinking pit according to claim 1, wherein the manhole block is raised and back-filled around the manhole block. 3. When the tubular submerged block is sunk, a lubricant is injected through a lubricant injection hole provided from the inner surface side to the outer surface side of the tubular submerged block to reduce friction between the outer surface of the tubular submerged block and the ground. The method for constructing a manhole-combined sinking pit according to claim 2, wherein the sinking is performed in a state where the sinkhole is set up. 4. A lubricant injection hole is provided from the inner surface side to the outer surface side of the cylindrical deposit block, and a lubricant guide groove continuous with the lubricant injection hole is provided on the outer surface of the cylindrical deposit block. A vertical submerged block for vertical shafts.