JPH10205270A - Shaft block, shaft excavation method and conduct pipe jacking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shaft entrance capable of withstanding earth pressure and, at the same time, having high cut-off efficiency in the case a concrete skeleton is driven forward and in the case a conduit is driven forward. SOLUTION: A shaft entrance 9 is bored in the circumferential wall of a concrete skeleton 2 of a shaft block in advance, a shaft entrance right 11 is provided on the circmferential surface of the shaft entrance 9, a shaft entrance sealant 21 of elastic body such as rubber, etc., is mounted on the shaft entrance ring 11, and a filter 25 and a shielding plate 23 are mounted on the outside and inside thereof respectively to close the shaft entrance 9. The shaft entrance ring 11 is formed in a curved shape as the projection to the outside of the concrete skeleton 2, and the shaft entrance sealant 21 or the filter 25 mounted on the shaft entrance ring 11 is also formed in a curved shate as the projection to the outside of the concrete skeleton 2. Under such a state, the shaft block 1 is pressed into the round and is driven forward to excavate a shaft. Then, the shaft entrance 9 is opened to drive the conduit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft block for manhole construction suitable for constructing a shaft or a sewer by a propulsion method, a manhole construction method using the shaft block, and a sewer propulsion method. . More specifically, a shaft block having a pit for propelling the sewer is propelled vertically into the ground to excavate the pit, and furthermore, a culvert for water and sewage is propelled from the pit of the pit, and after propulsion is completed, The present invention relates to a vertical shaft block for constructing a manhole using the vertical shaft block, a sewer propulsion method using the vertical shaft block, and a manhole construction method.

[0002]

2. Description of the Related Art When laying pipes for water supply and sewerage and other various pipes underground, a propulsion method is used as a method of performing non-cutting without cutting the ground. In this propulsion method, a shaft is excavated at an appropriate place on the ground, and the sewer is propelled from the shaft as a starting point or an intermediate point.
Conventionally, shafts for constructing such a propulsion method have been constructed by excavating the ground in the vertical direction while retaining the surrounding area using temporary earth retaining materials such as steel sheet piles. After the completion of the sewer propulsion work, manholes were constructed in this shaft. For example, after laying the foundation at the bottom of the shaft, installing a manhole block on it,
In addition to the connection of the sewer, the bottom of the manhole block was constructed with a bottom (inverted) and then the earth and sand around the manhole was backfilled.

[0003] In recent years, in urban areas, construction work for constructing relatively small-diameter sewers by the propulsion method has been increasing. However, in the above-described construction work, excavation of a shaft has become extensive, and excavation of the shaft has been performed. The open area for drilling is large. In addition, since a manhole must be separately constructed and the surrounding shaft must be backfilled, there is a disadvantage in that it takes time and effort to perform the entire construction from the shaft construction to the manhole construction.

Therefore, for example, as shown in Japanese Patent Application Laid-Open No. Hei 6-117176, a vertical shaft block made of cylindrical concrete is used, and is vertically pushed into the ground for propulsion. The shaft is excavated without removing it, and then the sewer is propelled into the ground from the propulsion pipe launching port established on the peripheral wall of the shaft block and laid. After that, a construction technique for constructing a manhole by using the shaft block as it is as a block forming the peripheral wall of the manhole, and a shaft block used for the construction technique have been proposed.

[0005] In this construction method, a propulsion pipe start port (a wellhead) is previously drilled in the peripheral surface of a shaft shaft, and the shaft block is pressed into the ground with the hole closed, and the shaft is opened after the shaft is completed. After the shaft is completed by press-fitting the shaft block, the wellhead is drilled with a core drill or the like. After that, the sewer is pressed into the ground from the wellhead and propulsion is performed. After completing the propulsion of the sewer, the manhole is constructed using the shaft block, and the end of the sewer is fixed to the entrance of the shaft block with mortar to complete the connection.

[0006]

However, in the above conventional construction method, after the shaft is completed, if a pit provided on the peripheral wall of the pit block is opened or drilled in advance, the ground around the pit block is removed. A large amount of sediment flows into the shaft block together with the water contained therein,
It is extremely difficult to eliminate them. In addition, it has been pointed out that when a sewer is fixed to a pit of a vertical shaft block with mortar, when a ground vibrates due to an earthquake or the like, a connection portion between the sewer and a manhole is easily broken.

[0007] In view of the above-mentioned problems in the conventional techniques of constructing a sewer and a manhole, a first object of the present invention is to provide a method for removing water and sediment flowing into a shaft when a shaft is opened after completion of the shaft. It is an object of the present invention to provide a shaft block that can be easily processed and a shaft excavation method using the shaft block. The second object of the present invention is, when propelling a pier, and when propelling a sewer,
An object of the present invention is to provide a wellbore capable of withstanding the earth pressure and obtaining a high waterproofness. Further, a third object of the present invention is to complete the shaft by the shaft excavation method and to promote the sewer, and then to obtain a connection state between the strong sewer and the shaft block.

[0008]

In order to achieve the above object, according to the present invention, a wellhead 9 is previously drilled in the peripheral wall of the concrete frame 2 of the shaft block 1 and a wellhead ring 11 is formed on the peripheral surface of the wellhead 9. The wellhead ring 11 is provided with a wellhead sealing material 21 made of an elastic material such as rubber, and a filter 25 and a shielding plate 23 are respectively attached to the outside and inside thereof to close the wellhead 9. And the wellhead ring 11
The wellhead seal material 21 and the filter 25 attached to the wellhead ring 11 also have a curved surface shape protruding outside the concrete skeleton 2. . In this state, the shaft 1 is pressed into the ground and propelled to excavate the shaft. At this time, the use of the blade 5 made of a metal cylinder such as a steel pipe facilitates the propulsion of the concrete skeleton 2.

After the shaft is excavated, firstly,
Is removed, and only the moisture of the surrounding ground is allowed to flow into the shaft block 1 through the filter, and this can be drained by the pump. After the water that has flowed into the shaft block 1 is drained, the filter 25 is cut and the pit 9 is opened, so that a large amount of soil containing water does not flow into the shaft block 1. Further, at the time of propulsion of the sewer 26, the gap between the sewer 26 and the wellhead 9 is sealed by the wellhead sealing material 21 attached to the wellhead ring 11, thereby preventing sediment and water from flowing in the sewer 26. Can be promoted.

That is, the shaft block according to the present invention comprises:
It has a concrete skeleton 2 having a cutting edge 5 at a lower end, the concrete skeleton 2 has a wellhead 9 opened on the peripheral wall thereof, and a wellhead ring 11 is formed on the inner periphery of the wellhead 9. Has a curved surface shape that protrudes outside the peripheral wall of the concrete skeleton 2.

More specifically, a wellhead outer ring 10 is fitted and fixed to the peripheral surface of the wellhead 9, and the outer wellhead ring 10 is fixed.
A wellhead ring 11 is provided on the inner periphery of the. The wellhead ring 11 is fixed to the wellhead seal material 21 made of an elastic sealing material such as rubber, so that the wellhead seal material 21 has the wellhead 9. The wellhead sealing material 21 also has a curved shape protruding outside the concrete skeleton 2.

Outside the wellhead ring 11 of the wellhead 9, a filter 25 that allows water to pass through and blocks earth and sand is provided. Wellhead 9
Inside the wellhead ring 11 is a hard shielding plate 2
3 is set. The cutting edge 5 is formed of a cylindrical metal tube, and has a saw-toothed unevenness formed at a tip edge thereof. When the upright is deep, another concrete skeleton 16 is connected to the concrete skeleton 2 having the wellhead 9.

Next, a method of excavating a shaft using such a shaft block 1 is to dispose a plurality of plate-like members having a curved surface shape corresponding to the curved surface of the peripheral wall of the cylindrical concrete skeleton 2 by digging a wellhead. While the block 9 is closed, the shaft block is propelled to excavate the shaft. After propulsion and excavation of the shaft, the shielding plate 23 is removed, and ground water flows into the concrete frame 2 through the filter 25 and is drained. After that, the filter 25 is cut off and the pit 9 is opened.

By doing so, when the shielding plate 23 is first removed, the inflow of earth and sand around the shaft block 1 is stopped by the filter 25, and only water mainly flows into the shaft block 1. The inflowing water can be easily drained using a pump. After draining the water contained in the ground around the shaft 1 in this way,
When the well 25 is opened by removing the filter 25, a large amount of earth and sand does not flow into the shaft block 1 together with water. After opening the wellhead 9 in this way, the sewer 26 is propelled from there into the soil. In this case, a concrete skeleton 2 in which a wellhead sealing material 21 is stretched between wellhead rings 11 of the wellhead 9 is used, and the gap between the sewer 26 and the wellhead 9 is sealed by the wellhead sealing material 21.

In this case, the wellhead ring 11 has a curved surface shape protruding outside the peripheral wall of the concrete frame 2,
By fixing the outer circumference to the wellhead ring 11, the wellhead sealing material 21 stretched on the wellhead 9 also has a curved surface shape protruding outside the concrete frame 2 like the wellhead ring 10. ing. For this reason, when receiving the culvert 26 propelled from the starting side of the culvert 26 on the pit side which is the receiving side of the culvert 26, the wellhead seal member 21 does not bend deeply inside the concrete skeleton 2. Also, the starting side of the sewer 26 can easily withstand the earth pressure from the ground. Thereby, the earth pressure resistance and the waterproofness can be improved on both the starting side and the receiving side of the duct 26.

The pipe 26 propelled in this way and connected to the wellhead block 1 is sealed with the wellhead sealing material 21.
Note that a cylindrical metal pipe such as a steel pipe is used as the cutting edge 5 of the concrete skeleton 2, and the concrete rim 2 is turned around its central axis because a serrated shape is formed at the leading edge thereof. Thereby, the concrete skeleton 2 can be easily propelled. In addition, the peripheral surface of the wellhead 9 and the sewer 2
A buffer packing 27 made of an elastic material such as a water-swellable rubber is inserted between the outer peripheral surface of the pipe 6 and the end of the sewer 26 at the wellhead 9 by elastically providing watertightness. Accordingly, even if the ground vibrates due to an earthquake or the like, a structure such as a crack in a connection portion is unlikely to occur, and a structure in which sewage breakage and water leakage hardly occur.

[0017]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings.
FIG. 1 shows a shaft block 1, which is an example having one cylindrical concrete skeleton 2. The concrete skeleton 2 is, for example, a cylindrical tube made of centrifugally molded concrete. This concrete skeleton 2
A steel joint 3 as a joint for connecting a casing 17 described below is embedded in the upper end surface of the joint. As shown in FIG. 2, the steel joint 3 has a T-shaped cross section, which is welded to a part of a reinforcing bar arranged in a mold for centrifugally molding the concrete frame 2. The concrete skeleton 2 is placed in a mold and centrifugally molded in this state. Thereby, the joint 3 is attached in a state where a part thereof is embedded in the end of the concrete skeleton 2. A part of this joint is erected from the outer peripheral portion of the end face of the concrete frame 2, and the erected part is provided with a concave notch 6 and a screw insertion hole 32 at regular intervals. I have.

At a predetermined position on the peripheral wall of the concrete frame 2, a wellhead 9 for propelling a conduit 26 described later or inserting and connecting a conduit 26 propelled from another shaft is drilled. As shown in FIG. 3, the wellhead 9 is formed by piercing the peripheral wall of the concrete skeleton 2 in the radial direction of the concrete skeleton 2. The wellhead 9 is drilled using a drilling machine or the like after molding the concrete skeleton 2 at the factory. The wellhead 9 may be perforated at only one location on the peripheral wall of the concrete skeleton 2, but at the same height or at two or more locations at different heights depending on the number of sewers 26 connected to the manhole. It is often pierced in places. In the illustrated example, two wellheads 9 are drilled at the same height on the peripheral wall of the concrete skeleton 2 so that the central axes are at 90 ° to each other.

As shown in FIGS. 3, 9, and 10, a wellhead fitting is fitted into the wellhead 9 and fixed. This wellhead fitting comprises a cylindrical wellhead outer ring 10 and a wellhead ring 11 provided on the inner periphery thereof. The wellhead outer ring 10 is fitted and fixed in a wellhead 9 formed on the peripheral surface of the concrete skeleton 2. In the illustrated example, the wellhead 9
The wellhead outer ring 10 is fitted into the inside of the wellhead, and the wellhead outer ring is attached to the circumferential surface of the wellhead 9 with an adhesive 12 such as an epoxy resin adhesive previously applied to the peripheral surface of the wellhead 9 and the outer circumferential surface of the wellhead outer ring 10. 10 are bonded to the outer peripheral surface. In addition, wellhead 9
The mortar 13 is filled in a portion between the inner peripheral side and the outer peripheral side of the concrete skeleton 2 in a gap between the outer peripheral surface of the wellhead outer ring 10 and the outer peripheral surface of the concrete well 2 and is cured to seal the bonded portion.

At approximately the center of the inner peripheral surface of the wellhead outer ring 10,
A well ring 11 in the form of a disc ring is fitted and fixed by means such as welding. The wellhead ring 11 is provided with screw holes at predetermined angular intervals. This wellhead ring 11 has a straight side shape as shown in FIG. 9, but has a curved shape such that it protrudes outside the concrete frame 2 as shown in FIG. 10. In the illustrated example, the curved surface corresponds to the curved surface of the cylindrical concrete skeleton 2. That is, wellhead ring 1
An inner surface and an outer surface of 1 are formed by a partial cylindrical surface which is substantially concentric with the concrete skeleton 2.

A cutting edge is provided at the lower end of the concrete frame 2. In the illustrated example, as shown in FIG. 4, a tapered surface 7 whose inner diameter gradually increases is formed on the inner periphery of the lower end of the concrete skeleton 2, and a cylindrical ring-shaped collar 4 is attached to the outer periphery thereof. I have. The collar 4 is arranged in the formwork in a state in which it is welded to a part of the reinforcing bar arranged in the formwork for centrifugally molding the concrete body 2 in the same manner as the joint 3, and in this state, the concrete body 2 Is centrifugally molded. As a result, the collar 4 is attached with its upper part partially embedded in the lower end of the concrete skeleton 2, and its lower part protrudes downward from the lower edge of the concrete skeleton 2. The cutting edge 5 is also made of cylindrical steel, and its inner diameter is equal to or slightly larger than the outer diameter of the collar 4. The upper end of the blade 5 is fitted into the outer side of the collar 4, and the bolt 14 and the nut 1
5 and fastened. Saw-tooth irregularities are formed at the tip edge of the cutting edge 5.

The shaft block 1 in which only one concrete skeleton 2 is used as described above is used when constructing a relatively shallow shaft and manhole. On the other hand, when constructing a deeper shaft and manhole, as shown in FIG. 5, another concrete skeleton 16 is connected to the concrete skeleton 2 having the cutting edge 5 and the pit 9 and used. In this case, a steel joint 33 having an L-shaped cross section is attached to the upper end of the concrete frame 2 having the cutting edge 5 and the wellhead 9 in place of the casing joint 3 as described above. This joint 3
3 is disposed in the formwork in a state where it is welded to a part of the anchor rebar arranged in the formwork for centrifugally molding the concrete body 2 in the same manner as the joint 3 described above. Is centrifugally molded. Thereby, the joint 33
Is attached in a state of being embedded over the peripheral surface and the end surface of the end of the concrete skeleton 2. In this state, the outer peripheral surface and the end surface of the joint 33 are substantially flush with the outer peripheral surface and the end surface of the end of the concrete skeleton 2.

A joint 33 having an L-shaped cross section is attached to the lower end of another concrete skeleton 16 connected to the concrete skeleton 2, similarly to the joint 33 attached to the upper end of the concrete skeleton 2. Then, the lower end surface of the concrete skeleton 16 is applied to the upper end surface of the concrete skeleton 2 via a packing for sealing (not shown), and the overlapped joints 33, 33 are welded. The two concrete bodies 2 and 16 are connected to each other. The connection between the concrete skeletons 2 and 16 by welding of the joints 33 and 33 is usually performed at a construction site, but may be performed at a factory when the concrete skeletons 2 and 16 are lightweight. The joint 3 for connecting a casing 17 described later is attached to the upper end of the upper concrete skeleton 16 in the same manner as that attached to the upper end of the concrete skeleton 1 as described above. This joint 3 is the same as that attached to the upper end of the concrete skeleton 2 in the above-described example.

FIG. 7 shows a casing 17 connected to the upper end of the concrete skeleton 2 or the upper end of the concrete skeleton 16 via the joint 3. This casing 17
It consists of a steel cylindrical tube, and the joint 18 is welded to the inner peripheral side of the lower end. The joint 18 has an outer diameter equal to the inner diameter of the casing 17, is fitted inside the casing 17, and is welded. The lower end of the joint 18 is the casing 1
7 protrudes downward from the lower end. A hole 33 for screw insertion corresponding to the screw insertion hole 32 of the joint 3 of the concrete skeleton 2 or 16 is formed in a portion of the joint 18 projecting from the casing 17. Projections 19 project from the lower end of the casing 17 in a shape and an interval corresponding to the notches 6 of the joint 3.

Next, using the shaft block 1 and the casing 17 as described above, the shaft block 1 is pressed into the ground and propelled, the shaft is excavated, and the sewer 26 is further propelled from the opening of the shaft. A procedure for constructing a manhole using block 1 will be described. Here, as shown in FIG. 5, a case where the concrete skeletons 2, 16 are connected in two steps to excavate a shaft will be mainly described.

As shown in FIGS. 9 and 10, on the outside of the wellhead ring 11 previously fixed to the inner periphery of the wellhead outer ring 10 of the wellhead 9 of the concrete frame 1, a pilot well well made of an elastic sealing material such as rubber is provided. The outer peripheral side of the seal member 22, the wellhead seal member 21 made of an elastic seal material such as rubber, the plurality of filters 25, and the ring-shaped seal holding ring 35 made of an elastic material such as rubber are sequentially applied. this house,
The wellhead seal material 22 for the pilot pipe is a
Is covered so as to cover almost the entire surface thereof, and a central portion of the wellhead sealing material 21 is open or has a notch such as a + or * shape. The filter 25 is stretched so as to cover the inside of the wellhead outer ring 10 over substantially the entire surface thereof. Filter 25
Are those that allow water to pass but not earth and sand.

On the other hand, inside the wellhead ring 11 on the inside,
The shielding seal member 36 made of an elastic material such as rubber and the shielding plate 23 are sequentially applied. These shielding sealing materials 3
6 and the shielding plate 23, inside the wellhead outer ring 10,
It is stretched so as to cover almost the entire surface. In this way, the seal holding member 21, the filter 25, the wellhead seal material 21, the shielding sealant 36, and the shielding plate 23 applied to the outside and inside of the wellhead ring 11 respectively penetrate these members and the wellhead ring 11. It is fixed to the wellhead ring 11 using a fastener 24 such as a nut screwed onto a bolt. The attachment of the wellhead sealing material 21 and the shielding plate 23 is usually performed in a factory or the like before being carried into the site. When the pilot pipe 26 to be described later is not propelled first, the pilot pipe wellhead seal member 22 may not be attached.

As already mentioned, the wellhead ring 11 is
As shown in FIG. 1, the side shape is straight.
As shown in FIG. 0, the plane shape is a curved shape protruding outside the concrete skeleton 2. Then, as described above, the seal holding member 21, the filter 25, the wellhead sealant 21, the shielding sealant 36, and the shielding plate 23 attached to the wellhead ring 11 are also shown in FIG.
As shown in FIG. 1, the side shape is straight.
As shown in FIG. 0, the plane shape is a curved shape protruding outside the concrete skeleton 2. In the illustrated example, the curved surface corresponds to the curved surface of the cylindrical concrete skeleton 2. That is, the inner and outer surfaces of these members are formed by partial cylindrical surfaces that are substantially concentric with the concrete skeleton 2. In addition, the shielding sealing material 36 and the shielding plate 23 inside the wellhead ring 11 may have a flat disk shape and a flat shape.

When excavating a shaft on a pavement surface, the pavement is first cut and removed, and a test excavation is performed to a depth of about 1.5 m from the road surface. To measure the plane position where the manhole is to be installed, a vertical shaft propulsion machine will be installed to propel the shaft using the centered position as a reference. Concrete frame 2
In a normal case, the blade 5 is transported to the site in a state where the blade 5 is not attached in advance, and the blade 5 is attached at the construction site as shown in FIG. 1 or FIG. The concrete skeleton 2 having the cutting edge 5 and the filter 25 attached thereto is mounted on the shaft propulsion machine, and the concrete skeleton 1 is vertically pressed into the ground while being turned or inverted around its central axis. At the same time, the sediment in the shaft block 1 is discharged.

As described above, the wellhead ring 11, the wellhead sealing material 21 fixed to the wellhead ring 11, and the filter 25 have a curved surface shape protruding outside the concrete frame 2, so that the Therefore, it can withstand the earth pressure from the outside of the concrete frame 2 sufficiently. In this sense, as shown in FIG. 10, the shielding seal member 36 and the shielding plate 23 attached inside the wellhead ring 11 may also have a curved shape protruding outside the concrete frame 2. desirable.

When another concrete skeleton 16 is connected after press-fitting and propelling the concrete skeleton 2 in this way, the concrete skeleton 2 is placed on the concrete skeleton 2 via a sealing packing (not shown) between the end faces. The concrete skeleton 16 is connected to the concrete skeleton 2 by superimposing the 16 and welding the joints 33, 33 that have come into contact with each other. Also, when the concrete skeleton 2 is used only in one stage, it goes without saying that such a connection work of the concrete skeleton is not performed.

In this state, the concrete frames 1, 1
6 is vertically pressed into the ground while being swiveled or reversed around its central axis. At the same time, the sediment in the shaft block 1 is discharged. When another concrete skeleton is connected on the concrete skeleton 16, the connection is performed in the same manner as described above. In this case, as the concrete skeleton 16, not the joint 3 for the casing but the joint 33 for connecting the concrete skeletons to each other is used. Further, the joint 3 for the casing is provided on the upper end face of another concrete skeleton connected thereon.

Next, as shown in FIG. 6, a casing 17 is connected to the upper end of the concrete skeleton 16. In addition,
If only one step of concrete skeleton 2 is used,
And a casing 1 on a concrete body 2 having
It goes without saying that 7 is connected. As shown in FIG. 8, the joint at the lower end of the casing 17 is connected to the concrete frame 1.
6 and the projection 19 (FIG. 7).
(See FIG. 5) in the joint 3 to prevent rotation. In this state, the screw holes 32, 3 between the joint 18 on the casing 17 side and the joint 18 on the concrete frame 16 side.
3 (see FIGS. 5 and 7) are fitted to each other, and as shown in FIG. 8, a fastening fitting 20 comprising a nut passing through the screw holes 32 and 33 and a bolt screwed into the nut.
Thus, the joint 3 and the joint 18 are fixed to each other. Thereby, the casing 17 is connected to the upper end of the concrete skeleton 16.

In this state, the concrete frames 1, 1
The casing 6 and the casing 17 are vertically pressed into the ground while rotating or reversing about their central axes. At the same time, the sediment in the shaft block 1 is discharged. Thus, the shaft is propelled and excavated to a predetermined depth. Then, the concrete skeletons 1 and 16 and the casing 17 are turned or rocked, and the concrete skeletons 2 and 16 are aligned so that the center and the wellhead coincide with the center of the shaft and the center of the sewer determined in advance by surveying. FIG. 6 shows a state in which the concrete skeletons 1, 16 and the casing 17 are buried in predetermined positions in this manner.

Next, the part to be the bottom wall of the manhole,
That is, between the lower ends of the concrete skeletons 2, fresh concrete is poured, the surface is finished, and the bottom 31 (see FIG. 13) is formed. Next, the wellhead 9 is opened. Wellhead 9
As described above, the inside of the wellhead ring 11 is made of an elastic sealing material 36 and a steel shielding plate 23.
, And the outside of the wellhead ring 11 is covered with a filter 25, between which a wellhead sealing material 21 is attached.

Therefore, first, when the fastening fitting 24 is removed and only the shielding seal member 36 and the shielding plate 23 are removed, water contained in the ground around the concrete skeleton 2 passes through the filter 25 and the wellhead sealing member 21 to remove water. Flows into. This water is drained by a pump. After draining the water from the ground sufficiently, the center of the filter 25 is shaped like a + or *.
The wellhead 9 is opened by cutting in a letter shape.

In this state, as shown in FIG. 11, a conduit 26 is inserted into the wellhead 9 from the inside of the concrete skeleton 2, and
The sewer 26 is extruded in the radial direction of the concrete skeleton 2 as shown by an arrow in FIG. Duct 2 at the same time
Discharge the earth and sand in 6. In this way, the sewer 26 is propelled to a predetermined position, and piping is performed. At this time, the wellhead sealing material 2
1 contacts the outer periphery of the sewer 26 with the outer peripheral part fixed to the wellhead ring 11, and seals the space between the sewer 26 and the wellhead 9.

When there are a plurality of sets of the wellhead 9 and the culvert 26 to be propelled, the wellhead 9 is opened as described above, and the culvert 26 is propelled from there. A shaft having the concrete skeleton 2 as described above has already been constructed at the propulsion destination of the sewer 26, and the head of the sewer 26 is received in the wellhead 9 of the shaft. As described above, since the wellhead ring 11 and the wellhead sealing material 21 fixed to the wellhead ring 11 have a curved surface shape protruding outside the concrete skeleton 2, the wellhead ring 11 is on the receiving side of the sewer 26. When receiving the sewer 26 propelled from the starting side of the sewer 26 on the shaft side, the wellhead seal member 21 does not bend deeply inside the concrete skeleton 2. Also, the starting side of the sewer 26 can easily withstand the earth pressure from the ground. Thereby, the earth pressure resistance and the waterproofness can be improved on both the starting side and the receiving side of the duct 26.

After completion of the propulsion, as shown in FIG. 12, a buffer packing 27 made of an elastic material such as water-swellable rubber is fitted into the wellhead 9 outside the wellhead ring 11. The buffer packing 27 is in close contact with the outer peripheral surface of the sewer 26 and the peripheral surface of the wellhead 9, and seals between the sewer 26 and the wellhead 9. For this reason, high water stoppage is obtained. Further, the cushioning packing 27 functions not only as a sealing material but also as an elastic structural member for elastically supporting the end of the sewer 26. For this reason, even if the ground shakes due to an earthquake or the like, the attachment portion of the duct 26 to the wellhead 9 is not easily broken.

Next, as shown in FIG. 13, an upper concrete frame 28 having a taper in part, that is, a so-called inclined wall, is connected to the concrete frame 16 and fixed. The upper concrete body 28 is molded with a metal ring-shaped lid receiving member 30 embedded therein, and a lid 29 made of metal, concrete, or reinforced plastic is fitted therein. The concrete skeletons 2 and 16 are laid so that the upper surface of the lid 29 is flush with the ground GL.

Thereafter, the casing 17 (see FIG. 6) is detached from the joint 3 of the concrete body 16 and is removed. Further, the periphery of the upper concrete body 28 is backfilled, and the pavement is repaired as necessary. Finally, steps 34 are mounted at appropriate intervals on the vertical portion of the inner peripheral surface of the upper concrete skeleton 28 and the concrete skeletons 2 and 16 at appropriate intervals, thereby laying and connecting the sewer 26. The manhole is completed. Note that the present invention is not limited to the above example. For example, in the illustrated example, two sets of pipes 26 are attached to the wellhead 9 of the concrete frame 2 so that the central axis is 90 °, but the angle formed by the central axes is arbitrary according to the purpose of the piping.

[0042]

As described above, according to the present invention, it is easy to propell the shaft 1 into the ground and excavate the shaft, and when the shaft 9 is opened after excavating the shaft. Discharge of water and earth and sand becomes easy. Further, it is easy to propel the culvert 26 from the wellhead 9 and the culvert 26 is reliably supported against vibrations of the ground. In addition, sewer 26
It is also easy to build manholes after promoting.

In particular, the wellhead ring 11 and the wellhead sealing material 21 fixed to the wellhead ring 11 have a curved surface shape corresponding to the curved surface of the peripheral wall of the cylindrical concrete skeleton 2.
It is convex outside the concrete frame 2. For this reason, when receiving the culvert 26 propelled from the starting side of the culvert 26 on the pit side which is the receiving side of the culvert 26, the wellhead seal member 21 does not bend deeply inside the concrete skeleton 2. Also, the starting side of the sewer 26 can easily withstand the earth pressure from the ground. Thereby, the earth pressure resistance and the waterproofness can be improved on both the starting side and the receiving side of the duct 26. For these reasons, shaft excavation and sewerage 26
A series of construction work such as laying a manhole and constructing a manhole can be easily performed, and a highly reliable water supply can be constructed.

[Brief description of the drawings]

FIG. 1 is a half sectional perspective view showing an example of a shaft shaft according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a section A of FIG. 1;

FIG. 3 is an enlarged sectional view of a main part showing a section B of FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part showing a cross section of a portion C in FIG. 1;

FIG. 5 is a half sectional perspective view showing another example of the shaft block according to the present invention.

FIG. 6 is a vertical cross-sectional side view showing a state where a casing is propelled from the ground to a predetermined depth and a shaft is excavated in a state where a casing is connected to an upper end of the shaft shaft block.

FIG. 7 is a perspective view showing an example of a casing connected to the upper end of the shaft shaft block.

FIG. 8 is an enlarged longitudinal sectional side view of a main part showing a connection portion between an upper end of a shaft shaft and a casing.

FIG. 9 is an enlarged longitudinal sectional side view showing an example of a state in which a portal of a shaft block is closed with a plurality of plates.

FIG. 10 is a sectional view taken along line DD of FIG. 9;

FIG. 11 is an enlarged cross-sectional plan view of an essential part showing an example of a state in which a tunnel entrance is opened and a sewer is propelled therefrom.

FIG. 11 is an enlarged cross-sectional plan view of a main part of a state in which propulsion is completed at the wellhead of the shaft block and the sewer is supported by buffer packing.

FIG. 13 is a longitudinal sectional side view showing an example of a state in which the propulsion of a sewer and a manhole are completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical shaft block 2 Concrete frame 5 Concrete frame blade 9 Concrete frame tunnel 10 Wellhead outer ring 11 Wellhead ring 17 Casing 21 Wellhead sealing material 22 Shielding sealing material 23 Shielding plate 25 Filter 26 Sewer 27 Buffer packing

Claims (16)

[Claims] In a vertical shaft block having a concrete skeleton (2) having a cutting edge (5) at a lower end, the concrete skeleton (2) has a wellhead (9) opened on a peripheral wall thereof. A wellhead ring (11) is formed on the inner periphery of the concrete body (2).
A shaft shaft having a curved surface shape protruding outward from the shaft. 2. A wellhead outer ring (1) is provided on a peripheral surface of a wellhead (9).
0) is fitted and fixed, and the outer wellhead ring (10)
A shaft shaft according to claim 1, characterized in that a wellhead ring (11) is provided on the inner periphery of the shaft. 3. The wellhead seal (21) is fixed to the wellhead ring (11) formed on the inner periphery of the wellhead (9), so that the wellhead seal (21) is attached to the wellhead (9).
The shaft shaft according to claim 1, wherein the shaft is stretched. 4. The shaft shaft according to claim 3, wherein the wellhead sealing material has a curved surface shape corresponding to a curved surface of a peripheral wall of the cylindrical concrete skeleton. 5. The filter according to claim 1, wherein a filter (25) that allows water and does not allow earth and sand to pass through is provided outside the wellhead ring (11) of the wellhead (9). Shaft block as described. 6. A shaft block according to claim 1, wherein a hard shielding plate (23) is provided inside the wellhead ring (11) of the wellhead (9). 7. The shaft block for manhole construction according to claim 1, wherein the cutting edge (5) is formed of a cylindrical metal tube. 8. The shaft shaft according to claim 7, wherein the cutting edge (5) has a saw-toothed unevenness formed at a tip edge thereof. 9. The shaft block according to claim 1, wherein another concrete skeleton (16) is connected to the concrete skeleton (2) having the wellhead (9). 10. A vertical shaft block having a concrete frame (2) provided with a cutting edge (5) at a lower end is used. The concrete frame (2) is pressed into the ground from the ground and propelled. In the method of excavating a shaft while excluding the earth and sand, a wellhead (9) is previously established on the peripheral wall of the concrete skeleton (2), and the wellhead (9) is protruded outside the concrete skeleton (2). A shaft excavation method, comprising: arranging a plurality of plate-shaped members having a curved surface shape, propelling a shaft in a state where a wellhead (9) is closed, and excavating a shaft. 11. A wellhead (9) of a concrete skeleton (2).
A shaft shaft excavation according to claim 10, characterized in that a wellhead ring (11) is formed on the inner periphery of the shaft, and the wellhead ring (11) has a curved surface shape protruding outside the concrete frame (2). Method. 12. A wellhead (9) for a concrete body (2).
A filter (25) that allows water to pass through and sediment-proof is installed outside the wellhead ring (11), and a hard shielding plate (23) is installed inside the wellhead ring (11). Item 12. The shaft excavation method according to Item 11. 13. After propulsion and excavation of the shaft, the shielding plate (23) is removed, and ground water is caused to flow into the concrete frame (2) through the filter (25) and drained. 12. The method according to claim 11, wherein the shaft is cut to open a wellhead (9). 14. After excavating a shaft by the shaft excavation method according to any one of claims 10 to 13, opening the wellhead (9);
A sewer propulsion method characterized by propelling the sewer (26) into the soil therefrom. 15. A concrete skeleton (2) having a wellhead sealing material (21) stretched between wellhead rings (11) of a wellhead (9) is used.
The method according to claim 14, characterized in that the gap between (6) and the wellhead (9) is sealed. 16. After completion of the propulsion, a buffer packing (27) is inserted into the wellhead (9) to elastically support the end of the sewer (26) and stop water. Or the sewer propulsion method according to 15.