JP7252608B2 - Shaft casing and earth retaining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vertical shaft casing and an earth retaining method for forming a space in the ground where construction work such as installation of buried pipes can be safely performed.

When installing a buried object, a vertical shaft is dug to the depth of installation, and work is performed in the vertical shaft. In order to prevent the earth and sand from collapsing into the pit during this work, it is necessary to install earth retaining members around the pit. As a method for constructing a simple vertical shaft, light steel sheet piles, liner plates, etc. are open-excavated with a backhoe and installed sequentially, but as the depth increases, the collapse of the ground is more likely to occur, making construction difficult and safe. There is also a problem above.

Therefore, it is conceivable to prepare a cylindrical casing in advance and install it in the ground to form a retaining wall. Patent Literature 1 describes burying a circular casing in the ground by simultaneously digging the inside of the casing and applying a downward force to the casing. Further, Patent Documents 2 and 3 describe that a cutting blade (cutting edge) is provided at the lower end of a circular casing, and is inserted into the ground by rotating and swinging it. Furthermore, in Patent Document 2, an opening is provided in the lower part, a burying plate is attached to close this opening, a hole is made in the burying plate, a propulsion pipe is press-fitted, and the burying plate is cut off when recovering the casing. , lifting the casing body. Patent Document 3 also describes forming a slit in the lower end of the casing and detachably attaching a closing plate that closes the slit. Patent document 4 has a cylindrical casing body, a horizontal pipe slit provided on the side surface from the lower end of the casing body, and a slit closing member detachably attached to the horizontal pipe slit of the casing body. A shaft casing is described in which the closing member is divided along the length of the horizontal pipe slit, and each divided member is provided with a semicircular horizontal pipe insertion notch. .

Japanese Unexamined Patent Application Publication No. 2006-37695 Japanese Unexamined Patent Publication No. 8-21181 Japanese Unexamined Patent Application Publication No. 6-146382 Utility Model Registration No. 3196696

There is a possibility of disasters due to the collapse of the ground in the excavation earth retention method of simple vertical shafts using conventional simple sheet piles. In addition, it is necessary to secure the reaction force to the back side due to the thrust of the propulsion machine in the jacking work, and the lightweight steel sheet pile and liner plate need to be reinforced.

Furthermore, in order to connect a horizontal pipe to the constructed vertical shaft, it is necessary to make a hole in a simple sheet pile or the like that constitutes the retaining wall and pass the horizontal pipe through the hole. In this case, the simple sheet piles and the horizontal pipe are integrally connected, so the simple sheet piles cannot be recovered after construction and are left in the ground. However, since such construction work is often carried out on public roads, it is better not to leave unnecessary steel materials in the ground in consideration of subsequent construction work. Disposal of materials is a waste of resources and increases costs.

In the invention described in Patent Document 1, a circular casing is prepared in advance, and the work of digging into the casing and applying a downward force to the casing are performed simultaneously, thereby burying the circular casing in the ground. can be easily constructed. However, since the circular casing of Patent Document 1 is a mere cylindrical member, in order to pass the horizontal pipe, it is necessary to provide a hole in the side wall and pass the horizontal pipe through the hole in the same way as in conventional simple sheet piles. . Therefore, since the circular casing and the horizontal pipe are connected, the circular casing cannot be recovered after construction. Although Patent Document 1 describes burying the circular casing in the ground, it does not describe pulling it up, and the circular casing is left in the ground.

According to the invention of Patent Document 2, the burying plate through which the propulsion pipe is passed can be separated when recovering the casing, and the casing body can be pulled up. Therefore, the casing body can be reused. However, since the buried board cannot be recovered, it is a waste of resources. In addition, the presence of such members in the ground hinders subsequent construction work. Furthermore, it is necessary to attach a cutting edge to the tip of the casing body, resulting in a complicated configuration. Equipment for rotating and oscillating the casing is also required, which increases the scale of the construction work and increases the cost.

In the invention of Patent Document 3, as the blocking plate for blocking the slit, a circular one for blocking the attachment port of the pipe and a band-shaped one for blocking the slit are described. When inserting the connecting pipe, remove the closing plate of the installation port. After the construction is completed, the closing plate of the slit is removed. Thus, the earth retaining casing is pulled out. In Patent Document 3 as well, a facility for rotating and rocking the casing is required, which increases the scale of the construction work and increases the cost.

The invention of Patent Document 4 can easily form a circular vertical shaft, and can recover most of the materials after construction without leaving them in the ground. However, the water stop packing attached to the notch for inserting the horizontal pipe is a ring-shaped rubber plate, and has a hole with a diameter slightly smaller than the cross section of the horizontal pipe to be installed. Therefore, depending on the conditions of the soil and groundwater at the construction site, a certain amount of earth and sand or water may flow into the casing even during installation of the shaft casing. Therefore, there is a demand for a versatile shaft casing and earth retaining method that are easy to use even in such places. It is also desirable to be able to perform construction more efficiently.

To provide a casing for a shaft and a method for retaining it, capable of forming a strong and safe earth retaining wall of a shaft simply and efficiently at a low cost, capable of recovering materials without leaving them in the ground, and having high versatility. With the goal.

In order to solve the above-described problems, the shaft casing of the present invention includes a cylindrical casing body, horizontal pipe slits provided on the side surface from the lower end of the casing body, and the horizontal pipe slits of the casing body from the inside of the casing body. The shell guard is detachably attached, and the casing body is composed of a combination of a plurality of bent plate-like members of 2 or more and 6 or less divided along the length direction, and the shell guard is the length of the horizontal pipe slit. Each of the divided members is provided with a semicircular notch for inserting the horizontal tube, and the notch for closing the notch for inserting the horizontal tube is provided. A closure member is provided removably from the interior of the casing body.
The horizontal pipe slit is provided in one of the divided bending plate-shaped members, and by providing a plurality of bending plate-shaped members having horizontal pipe slits, horizontal pipes extending in different directions can be installed.
In addition, an extension casing having a cylindrical shape having the same diameter as the casing body and detachably attached to the casing body is provided. It has a plate-shaped member attached to the inner wall surface or the outer wall surface of the main body or the extension casing, and a hanging tool through hole formed in the upper part of the plate-shaped member, and the upper part of the plate-shaped member is inside or outside the casing main body or the extension casing. It has an outwardly inclined portion so that when another extension casing is placed on top of the casing main body or the extension casing, the lower edge of the upper extension casing engages with the sling attachment member. Thus, shafts of various depths can be efficiently formed.

In the earth retaining method of the present invention, the shaft casing is used, the shell guard and the cutout closing member are attached, and the shaft casing is installed in the ground to form a cylindrical earth retaining wall. Remove the notch closing member from the inside of the casing from the shell guard, attach a ring-shaped water stop packing with a hole in the center to the shell guard, and insert the horizontal pipe into the hole of the water stop packing and the notch for inserting the horizontal pipe. After installing the horizontal pipe, the shell guard is separated into divided members and removed, the bent plate-shaped member constituting the casing main body is separated from the inside of the shaft casing, and the bent plate-shaped member is pulled up and recovered.

The shaft casing of the present invention can be installed in the ground simply and at low cost to form a safe shaft retaining wall. A strong and safe earth retaining wall for a shaft can be formed simply, at low cost, and efficiently.In addition, materials can be recovered without leaving any material in the ground. It is highly versatile and flexible.

It is a front view which shows the casing for shafts. It is the same AA sectional view. It is a front view which shows a casing main body. It is the same top view. It is a front view which shows a bending plate-shaped member. It is the same view. It is a front view which shows a slit casing. It is a front view which shows a connection member. FIG. 4 is an enlarged cross-sectional view showing a connecting portion of a plurality of bent plate-shaped members; It is a front view which shows a shell guard. It is a front view which shows a water stop device main body. It is a front view which shows a water stop packing retainer board. It is a front view which shows a notch part closing member. FIG. 4 is an enlarged cross-sectional view showing the vicinity of a horizontal pipe slit; It is a front view which shows water stop packing. It is a front view which shows a sling attachment member. It is the same side view. It is sectional drawing which shows the initial state of the installation work of the casing for shafts. It is sectional drawing which shows the state which the installation work of the casing for vertical shafts progressed. It is a cross-sectional view showing a state of propelling the horizontal pipe. It is the same top view. FIG. 3 is a plan view showing a configuration example of a casing main body; 4 is a longitudinal section showing another configuration example of the casing main body;

A mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a shaft casing, and FIG. 2 is a cross-sectional view taken along the line AA. The shaft casing 1 includes a cylindrical casing body 2, a horizontal pipe slit 3 provided on the side surface from the lower end of the casing body 2, and detachably attached to the horizontal pipe slit 3 of the casing body 2 from the inside of the casing body 2. and a shell guard 4. Furthermore, in this example, a plurality of extension casings 5 are mounted on the casing main body 2 .

The casing main body 2 is a member constituting the main part of the shaft casing of the present invention, and is made of a strong material such as a steel plate. Its diameter is selected according to the space required for construction, and a diameter of about 1360 to 3500 mm is particularly useful. For example, the thickness is 9-16 mm, and 12 mm is selected here.

The height of the casing body 2 is also selected according to the shaft to be constructed. This depth may be covered only by the casing main body 2, or may be combined with a plurality of extension casings 5 as in this example. At this time, if a plurality of extension casings 10 with different heights are prepared, it is possible to correspond to construction of various depths by combining them. For example, when the inner diameter is 1566 mm, the height of the casing body 2 is about 1500 mm, and the extension casings 10 of various heights of 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, and 700 mm are arranged to obtain the required depth. Most construction can be covered.

3 is a front view showing the casing main body, and FIG. 4 is a plan view of the same. The casing main body 1 is divided along its length direction, and is composed of a combination of a plurality of bent plate-like members 6 . In plan view, the casing body 1 has a substantially circular tubular shape, but its circumference is divided into a plurality of arcs. The number of divisions is preferably 2 or more and 6 or less, and it is particularly preferable to divide the circumference into four equal parts of 90 degrees each as in this example. In the case of a large-diameter casing, dividing it makes it easier to transport, and also makes it easier to pull up after construction.

The bent plate-like member 6 is shaped like a rectangular plate bent into an arc. At least one of the bent plate-like members forming the single casing body 1 is the slit casing 7 . FIG. 7 is a front view showing a slit casing. A horizontal pipe slit 3 having a rectangular shape in a front view is formed in the lower portion of the slit casing 7 . A plurality of slit casings 7 may be provided for one casing body 1 as will be described later.

The plurality of divided bent plate-like members 6 and 7 can be cylindrically connected by bolting the connecting portions from the inside of the pipe. In this example, the side ends of the bent plate-shaped members are connected to each other by an elongated strip-shaped connecting member 8 . FIG. 8 is a front view showing a connecting member, and FIG. 9 is an enlarged cross-sectional view showing a connecting portion of a bent plate member. The connecting member 8 is provided with a plurality of connecting female screw holes 9 arranged in two rows along its length direction. In this example, the connecting female threaded hole is formed by welding a nut. On the other hand, both ends of the bent plate members 6 and 7 are provided with the same number of bolt holes. A connecting member 8 is applied to the connection place of the bent plate-shaped members 6 and 7 from the outer surface of the bent plate-shaped members 6 and 7, a bolt is passed through the bolt hole from the inside of the bent plate-shaped members 6 and 7, and the connecting member 8 is screwed into the female threaded hole 9 for connection. Also when separating, a tool is used from the inside of the bending plate-like members 6 and 7 to remove the bolts. In this way, the bending plate members 6 and 7 can be connected and separated from the inside of the casing body 2 . The connecting member 8 may be attached to the inner surfaces of the bent plate-like members 6 and 7. I will make a hole.

Explain shell guards. FIG. 10 is a front view showing the shell guard. The shell guard 4 is a member that closes the horizontal pipe slit 3 by being attached to the position of the horizontal pipe slit 3 . The shell guard 4 is divided along the length direction of the horizontal pipe slit 3, that is, along the height direction of the casing body 2, and is formed into two symmetrical members. Each of them can be attached to and detached from the inside of the casing at the position of the horizontal pipe slit 3 of the casing main body 2 by connecting members such as bolts. The shell guard 4 has a shell shape having a curved surface along the inner surface of the casing body 2 and is shaped to cover the horizontal pipe slit 3 . When the left and right members are combined, a hole is formed near the center for the horizontal pipe to pass through. This hole for inserting the horizontal tube may be formed directly in the shell guard 4, but in this example, a rectangular hole larger than the hole for inserting the horizontal tube is provided around the center of the shell guard 4, and is stopped here. A water container main body 12 is attached, and a horizontal pipe insertion hole 11 is formed in the water stop main body 12.例文帳に追加

FIG. 11 is a front view showing the main body of the water stop device. This water stop device body 12 is also shell-shaped with a curved surface along the inner surface of the shell guard 4, and is vertically divided along the center line. The divided portion has a semicircular notch portion for inserting the horizontal pipe, and a circular hole 11 for inserting the horizontal pipe is formed when the left and right members are combined. By making the water stop main body 12 a member that can be separated from the main body in this way, by selecting the water stop main body 12 of the horizontal pipe insertion hole 11 corresponding to the horizontal pipe of various diameters, This can be handled without changing the slit casing 7 and the shell guard 4.

FIG. 12 is a front view showing a water stop packing retainer plate, FIG. 13 is a front view showing a notch closing member, and FIG. 14 is an enlarged cross-sectional view showing the vicinity of a horizontal pipe slit. The notch closing member is a member attached so as to close the lateral tube insertion hole 11 formed by the lateral tube insertion notch. For example, a circular or elliptical rubber plate is used here, although a disc-shaped bent plate made of metal having a curved surface along the surface of the water stop main body 12 may be used. The water stop packing retainer plate 14 is a ring-shaped bent plate member whose outer shape is almost the same as that of the notch closing member 13, but has a large hole inside. It has a curved surface along the

As shown in FIG. 14, the water stop main body is attached to the inner surface of the shell guard 4 with bolts, and a notch closing member 13 is provided from the inner surface side of the water stop main body 12 so as to close the horizontal pipe insertion hole 11 . Then, the water stop packing retainer plate 14 is overlaid from the inner side and fastened from the inner side with a bolt. Therefore, a plurality of bolt through holes are formed in the vicinity of the outer periphery of the notch closing member 13 and the water stop packing pressing plate 14, and female screw holes are formed in the water stop body at positions corresponding to the holes. A nut is attached by welding.

The vertical shaft casing 1 also includes a water stop packing 15 . Although the waterproof packing 15 is not attached in the state shown in FIG. 14, it will be attached during construction as described later. FIG. 15 is a front view showing the waterproof packing. It is a rubber plate member having a circular or elliptical outer shape, which has the same outer shape as the notch closing member, but has a hole 16 inside for a horizontal tube to pass through. This hole 16 is smaller than the outer diameter of the horizontal tube. Further, when the water stop packing 15 is applied along the surface of the water stop main body 12, the outer shape of the water stop packing 15 is large enough to be outside the horizontal pipe insertion hole 11.例文帳に追加

A plurality of hanger mounting members 17 are provided on the upper edge of the casing body 2 . In this example, the casing main body 2 is composed of four bent plate-like members 6 and 7, and each of the bent plate-like members 6 and 7 is provided with two sling attachment members 17. As shown in FIG. FIG. 16 is a front view showing a sling attachment member, and FIG. 17 is a side view of the same.

The sling attachment member 17 has a plate-like member 18 attached to the inner wall surface or the outer wall surface of the casing body 2 or the extension casing 5 and a sling hook through-hole 19 formed in the upper portion of the plate-like member 18 . The upper portion of the plate member 18 has an inclined portion 20 inclined toward the inside or outside of the casing main body 2 or the extension casing 5 . For example, in this example, the plate member 18 is attached to the outer surface of the casing main body 2 and the extension casing 5 by welding or bolting, and the upper portion thereof is bent outward.

A plurality of sling attachment members 17 are attached to the casing main body 2 and the extension casing 5, and they are arranged side by side on the same circumference. Then, when another extension casing is placed on the portion that protrudes above the upper end, the lower edge of the upper extension casing is engaged. In this way, just by placing the extension casing on top, it is connected to the lower casing main body and the extension casing in a state where the cores are accurately aligned. Moreover, since the upper portion of the plate member 18 is open outward, this portion acts as a guide for guiding the extended casing placed thereon upward.

A hook, a clamp, or the like can be hung on the hanger through hole 19, or a wire can be passed through. Thereby, the casing main body 2 and the extension casing 5 can be safely suspended by a crane.

Next, an example of the earth retaining method will be described. A casing main body 2 and an extension casing 5 that match the diameter and depth of the shaft to be installed are prepared. In addition, the slit casing 7, the water stop main body 12, the notch portion closing member 13, and the water stop packing pressing plate 14 are also prepared according to the diameter and height of the horizontal pipe to be installed. In particular, since the water stop main body 12, the cutout portion closing member 13, and the water stop packing pressing plate 14 are relatively small members, if they are made to match the diameter of the different horizontal pipe, they can be replaced. This makes it possible to obtain a highly versatile system that can handle various construction works with a small amount of materials. From among them, the one that matches the horizontal pipe to be constructed at that time should be selected.

The bent plate member 6 and the slit casing 7 can be transported to the site in a separated state. At the site, the bending plate-shaped member 6 and the slit casing 7 are connected by the connecting portion 8 to assemble the casing main body 2 . The bent plate member 6 and the slit casing 7 are connected to the connecting portion 8 using bolts from inside the casing body 2 . Also, the water stop main body 12, the notch portion closing member 13, and the water stop packing pressing plate 14 are attached to the horizontal pipe slit 3 of the slit casing 7 and placed. The waterproof packing 15 may not be attached yet.

A bolt through hole 7 is provided around the shell guard 4 so that the shell guard 4 can be attached to and detached from the casing body 2. - 特許庁Attach and detach bolts from the inside of the curved surface. When the shell guard 4 is attached to the casing body 2 , the lower end of the shell guard 4 is positioned at the lower end of the casing body 2 .

A hanger through hole 19 for a hanger mounting member 17 is provided at the upper edges of the casing main body 2 and the extension casing 5 . By passing a wire or the like through the hanging tool through hole 19, it can be safely hung. Moreover, a shock absorbing member such as a blow may be attached to the upper edge of the casing main body 2 or the extension casing 5 .

Further, an earth retaining method using this vertical shaft casing will be described based on an example of a buried pipe installation method. FIG. 18 is a cross-sectional view showing the initial state of the installation work of the shaft casing. The present invention can also be implemented with a general-purpose construction machine without using a special device for rotating and rocking. In this example, a hydraulic excavator 21 of a type called a backhoe is used.

First, a preliminary hole x is dug at the construction site with the hydraulic excavator 21 . If the excavation length is short or if the ground does not collapse easily, the excavation can be continued as it is. However, once the depth reaches a certain level, the surrounding earth and sand will begin to crumble. do. The shell guard 4 is already attached to the casing body 2. If the casing main body 2 is in the preliminary hole x to some extent, the extension casing 5 may be connected thereon. Since a plurality of sling attachment members 17 are also provided on the upper part of the extension casing 5, the sling can be safely suspended by passing a wire or the like through the sling attachment hole 19. - 特許庁

Next, the inside of the casing main body 2 is dug by the hydraulic excavator 21 . As a result, the hole x becomes deeper, and the casing body 2 moves downward. FIG. 19 is a cross-sectional view showing a state in which the shaft casing installation work has progressed. When the casing main body 2 is lowered to a predetermined depth, the extension casing 5 is sequentially connected on the casing main body 2, and the excavation is advanced to the final depth.

After the vertical shaft casing 1 is inserted to a predetermined depth, the space between the vertical shaft casing 1 and the hole is backfilled with soil. Thus, safe shafts are easily constructed. The side wall of the shaft casing 1 serves as a solid retaining wall as it is. Since the horizontal pipe insertion hole 11 is also completely closed by the notch closing member 14, even in a place with soft soil or a lot of groundwater, by combining a plurality of extension casings 5 with different heights, the depth can be changed. Inflow of sediment and water into the vertical shaft casing 1 can be prevented even in the case of the vertical shaft.

Once the pit is complete, workers will go inside and perform the necessary work. FIG. 20 is a sectional view showing a state in which the horizontal pipe is pushed forward, and FIG. 21 is a plan view of the same. First, make the base plate. For example, a concrete layer with a thickness of about 200 mm is formed. Then, the propulsion machine 22 is installed on this reinforced bottom plate. Such propellers 22 are already in widespread use. It has a chuck that grips the outer circumference of the pipe, and the horizontal pipe is inserted into the ground by pushing out the chuck.

The waterproof packing 15 is attached before the horizontal pipe is propelled. First, the bolt that attaches the notch closing member 13 is removed with a tool. Since this bolt is installed from the inside of the casing from the inside, this operation can also be done from inside the shaft. Next, the water stop packing 15 is applied to the same position, and the water stop packing presser plate 14 is applied from above, and it is attached by tightening with a bolt. This work can also be easily done from inside the shaft. The removed cutout closing member 13 can be collected and reused. Then, the position of the horizontal tube y is aligned with the hole 16 of the waterproof packing 15 of the shell guard 4 and sent out.

The tip of the horizontal tube y comes into contact with the periphery of the hole 16 of the waterproof packing 15 and advances while pushing this portion. As a result, the portion around the hole 16 is pushed out, and the hole 16 gradually widens. Then, the tip of the horizontal tube y passes through the hole 16 and advances further. The inner peripheral portion of the waterproof packing 15 is in close contact with the side surface of the horizontal pipe y. In this way, a water cutoff portion is formed on the side surface of the horizontal pipe y to prevent earth and sand and groundwater from flowing into the pit.

In installing the horizontal pipe y, a thick pipe called a pilot pipe is first driven in, and then the original pipe such as a sewage pipe is passed through the pilot pipe. 20 and 21 show the state in which the pilot tube is being propelled. In the present invention, since a strong circular casing is buried, the propulsion machine can be installed without considering the reaction force in the jacking work.

As described above, the horizontal pipe insertion hole is closed by the notch portion closing member 13 before the horizontal pipe is propelled, and is water-blocked by the water stop packing 15 after the horizontal pipe passes through. Therefore, in most of the construction steps, the inflow of sediment and groundwater into the vertical shaft is prevented.

Construction often has a certain period of time, and the work is interrupted at night or the like. At this time, by placing a cover such as a steel plate on the vertical shaft, cars and the like can pass over the vertical shaft.

After the work inside the shaft is completed, the materials will be removed. First, remove equipment such as propulsion equipment. Next, the shaft casing is recovered.

Break the concrete of the bottom plate and separate the lower end of the shaft casing from the bottom plate. Further, the shell guard 4, the water stop device main body 12, and the water stop packing pressing plate 14 are removed. Since these members are attached by bolts from inside the casing, they can be easily separated by unscrewing the bolts. Moreover, since these members are each divided into two parts, by separating these parts, they can be easily removed and recovered without interfering with the horizontal tube y.

The earth and sand are put back into the shaft, and the inside of the casing is backfilled while performing rolling compaction. At this time, the bent plate member 6 and the slit casing 7 that are connected are separated. Since the bending plate member 6, the slit casing 7, and the connecting member 8 are attached by bolts from within the casing, they can be easily separated by unscrewing the bolts. The connecting member 8 is connected to the two bent plate-like members 6 or the slit casing 7, but may be disconnected from either one of them, and may remain connected to the other. As a result, the bent plate member 6 and the slit casing 7 can be pulled up one by one. Since two hoist attachment members are provided on the top of each of the bent plate member 6 and the slit casing 7, a wire or the like can be passed through the hoist hole 19 for safe hoisting.

Since the hoist attachment member is also provided on the extension casing 5, it can be hoisted from the ground by a crane. The extension casing 5 may also be divided into a plurality of bent plate members like the casing main body 2, but in this example they are integrally formed without being divided.

Since all the members attached to the horizontal pipe slit 3 have been removed, the horizontal pipe slit 3 is open. The slit casing 7 can be easily collected without interfering with the horizontal pipe y by the horizontal pipe slit 3 . In this way, all the materials including the shell guard 4 can be collected and reused, so that resources can be effectively utilized. Since unnecessary members are not left in the ground, there is no adverse effect even when another construction is carried out in the same place at a later date.

Although the example of the starting shaft in the jacking work has been described above, the vertical shaft casing of the present invention can also be used on the side of the arrival shaft. In this case, the horizontal pipe sent from the starting hole enters the shaft through the horizontal pipe insertion hole 11 . After that, the shell guard 4 can be removed from the lateral tube as in the case of the launch well. In addition, it can be used for a wide range of purposes such as excavation work and buried object installation work, in addition to promotion work.

Since the casing main body 2 of the shaft casing 1 of the present invention is composed of the divided bent plate-like member 6 and the slit casing 7, it can be combined with various constructions. In particular, by providing a plurality of slit casings 7, the installation of the horizontal pipes can be made flexible. FIG. 22 is a plan view showing a structural example of a casing main body. FIG. 22(a) shows an example in which two slit casings 7 are arranged at opposite positions. Thereby, the horizontal pipe can be installed so as to penetrate the shaft. FIG. 22(b) shows an example in which two slit casings 7 are arranged adjacent to each other, and lateral pipes can be connected from orthogonal directions.

FIG. 23 is a cross-sectional view showing another structural example of the casing main body. Although this is an example in which two slit casings 7 are arranged at positions facing each other, horizontal pipe insertion holes are provided at different heights between the two bodies. The lateral tube slits are formed at different depths. In some cases, there are drainage ditches and buried objects near the construction site, and the horizontal pipes cannot be passed through due to their depth. In such a case, it is possible to use a slit casing 7 having horizontal pipe slits corresponding to the unobstructed depth, and to connect the two horizontal pipes by introducing them into the pits at different levels.

1. Shaft casing2. casing body;3. Slits for horizontal pipes4. Shell guard 5. extension casing6. 7. bent plate member; Slit casing (bent plate-like member with slits)
8. connecting member 9 . female screw hole for connection 10 . bolt through hole 11 . Horizontal tube insertion hole 12 . Water stop device body 13 . Notch closing member 14 . Water stop packing pressing plate 15 . Water stop packing
16. hole 17 . Hanging attachment member 18 . Plate member 19 . Hanging tool through hole 20 . slope
21. hydraulic excavator 22 . propeller x. spare hole y. Lateral tube

Claims (5)

A cylindrical casing body, a horizontal pipe slit provided on the side from the lower end of the casing body, a shell guard detachably attached from the inside of the casing body to the horizontal pipe slit of the casing body , and a stopper attached to the shell guard. having a water vessel body ,
The main body of the casing is composed of a combination of a plurality of bent plate-shaped members divided along the length direction, and the bent plate-shaped members can be connected and separated by bolts with belt-like connecting members. has become
The shell guard and the water stop main body are divided along the length direction of the horizontal pipe slit, and each member of the divided water stop main body is provided with a semicircular cutout for inserting the horizontal pipe. hand,
A casing for shaft, wherein a notch closing member for closing the notch for inserting a horizontal pipe is detachably provided from the inside of the casing body. 2. The vertical shaft casing according to claim 1, wherein the horizontal pipe slit is provided in one of the divided plate-like members, and there are a plurality of bent plate-like members having the horizontal pipe slit. It has an extension casing that is detachably mounted on the casing body and has a cylindrical shape with the same diameter as the casing body,
A sling attachment member is provided on the upper edge of the casing main body and the extension casing,
The sling attachment member has a plate-like member attached to the inner wall surface or the outer wall surface of the casing main body or the extension casing, and a sling hook through hole formed in the upper part of the plate-like member,
The upper part of the plate-shaped member has an inclined portion inclined toward the inside or outside of the casing main body or the extension casing,
3. The vertical pit according to claim 1 or 2, wherein when another extension casing is placed on top of the casing main body or the extension casing, the sling attachment member and the lower edge of the upper extension casing are engaged with each other. casing. 4. The vertical pit according to any one of claims 1 to 3, having water stop device bodies for inserting horizontal pipes of different diameters, so that a water stop device body suitable for a horizontal pipe to be constructed can be selected. casing. A cylindrical casing body, a horizontal pipe slit provided on the side from the lower end of the casing body, a shell guard detachably attached from the inside of the casing body to the horizontal pipe slit of the casing body , and a stopper attached to the shell guard. having a water vessel body ,
The main body of the casing is composed of a combination of a plurality of bent plate-shaped members divided along the length direction, and the bent plate-shaped members can be connected and separated by bolts with belt-like connecting members. has become
The shell guard and the water stop main body are divided along the length direction of the horizontal pipe slit, and each member of the divided water stop main body is provided with a semicircular cutout for inserting the horizontal pipe. hand,
A notch closing member for closing the notch for inserting the horizontal pipe is provided detachably from the inside of the casing body ,
This earth retaining method uses a shaft casing with an extension casing that is detachably attached to the casing body, which is cylindrical with the same diameter as the casing body and is integrally formed without being divided along the length direction. A shaft casing is installed in the ground with the notch closing member attached to form a cylindrical earth retaining wall,
Remove the cutout closing member from the inside of the shaft casing from the shell guard, attach a ring-shaped water stop packing with a hole in the center to the shell guard,
Pass the horizontal pipe through the hole in the waterproof packing and the notch for inserting the horizontal pipe,
After installing the horizontal pipe , lift the integrally formed extension casing from the ground,
Separate the shell guard into divided parts and remove it,
While backfilling the inside of the casing, separating the bent plate-shaped member constituting the casing body from the inside of the shaft casing,
An earth retaining method in which a bent plate-shaped member is pulled up and recovered.

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