JPS603394A - Construction of underground connecting measure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing an underground connection hall installed at a connection point between a main pipe and a branch pipe of water supply/sewerage, electric power, communication circuits, etc. buried underground.

In general, construction of junction pits for main and branch pipes in water and sewage systems, branch pits for power cable culverts, etc.
The so-called open-pit mining method, in which excavation is carried out from above the ground, has been widely used for some time.

However, due to the widening of traffic due to the increase in the number of automobiles in recent years, the construction of manholes etc. by open pit mining tends to be severely restricted from a safety standpoint, and as a result, even if sewerage facilities etc. are planned, However, there are many problems in which construction of manholes at narrow and frequent intersections with traffic becomes difficult and construction work cannot be carried out.

Furthermore, in shopping streets and the like with narrow roads, a large amount of business compensation may be required due to traffic obstruction caused by open pit construction, leading to a significant increase in construction costs.

On the other hand, as a measure to avoid adverse effects on traffic, etc., the so-called shield construction method is adopted in the construction of large-diameter culverts. However, this construction method requires large-scale construction equipment, and cannot be used for small-scale construction projects such as constructing new manholes for sewerage at intersections with wide roads.

The present invention aims to solve the above-mentioned problems in the construction of manholes, etc. for water supply, sewerage, electric power, and communication lines, and even if there are narrow intersections, surface traffic and other existing The object of the present invention is to provide a construction method that allows manholes and the like to be constructed extremely safely and inexpensively without causing any damage to underground structures.

The present invention sequentially connects buried pipes 7 to the rear of a steel lead pipe 6, press-fits the lead pipes 6 and buried pipes 7 to the construction point of the underground connection hall 1 using a press-in device 5, and then connects the lead pipes 6 The front end surface etc. are closed, and then the buried pipe 7 is crushed by a certain size from the tip to the rear, and the outside of the broken part is excavated and expanded, and the retaining segment 15 is rolled up, and the earth retaining segment 15 is rolled up. Crushing of buried pipe 7, diameter expansion of excavation, and earth retaining segment 1
The basic idea is to repeat the winding process in step 5 backwards in order to construct an underground connection site for water, sewerage, electricity, and communications lines, etc.゛Hereinafter, details will be explained based on an embodiment of the present invention shown in FIGS. 1 to 7. FIG. 1 is a schematic plan view of constructing an underground sewer connection hall 1 within the intersection A according to the present invention. In the figure, 2 is the main sewer pipe, and 3 is the sewer branch pipe connected to this. It is. 4 is a working hole for press-fitting the main pipe 2 and constructing the connection chamber 1;
It is located at a location approximately 30 to 50 meters away from intersection A, where there is relatively little hindrance to traffic.

When constructing underground connection hall 1 within intersection A,
First, 30 minutes from the intersection A of the road where the main sewer pipe 2 will be laid.
Appropriate dimensions (e.g. width 4m, height 4m) within ~50m
Dig a working hole 4 with a diameter of approximately 5 m and a depth of 5 m. Next, a press-fitting device 5 is installed in the working hole 4, and the leading pipe 6 and buried pipe 7 having an inner diameter of about 2000 to 3000 mm, which have been carried into the working hole 4, are sequentially press-fitted toward the intersection point A.

The leading pipe 6 is a short pipe made of a steel plate as shown in FIG.
A cutting edge 6a is formed on the outer periphery of the front end. Further, the buried pipe 7 is a so-called reinforced concrete hume pipe, and the length of each pipe is appropriately selected according to the dimensions of the working hole 4.

A buried pipe 7 is press-fitted by a press-in machine 5 with a leading pipe 6 at the beginning, and earth and sand from the tuyere is conveyed backward through the buried pipe 7. A predetermined number of buried pipes 7 are successively added and press-fitted, and when the leading pipe 6 completely protrudes outside the planned construction area of the connection chamber 1 as shown by the dotted line in FIG. 1, the press-fitting is stopped.

When the press-fitting is completed, first, the front end surface of the leading pipe 6 is covered with an iron plate 8 as shown in FIGS. 3 and 4, and support columns 9, 9 are appropriately set up on the inside thereof.

Further, support columns 10, 10 are also erected at the rear end of the leading pipe 6.

Once the support columns 9 and 10 have been erected, the erector guide shaft 11 is placed in a position eccentric to the axis O of the buried pipe 7 by a certain distance n in any direction, for example in the lateral direction, parallel to the axis O. Then, the tip portions thereof are supported and fixed to the support columns 9 and 10 as appropriate. In this embodiment, the guide shaft 11 is made eccentric by a distance c from the axis O by using erectors 12 and 13 rotatably inserted into the guide shaft 11, as will be described later. By forming the connecting hole at a position eccentric from the axis, the radius of curvature R of the connecting part between the branch pipe 3 and the buried pipe 7 (main pipe 2) is increased to make the flow smoother. If the branch pipe 3 is relatively thin and is not necessary, the guide shaft 11 may be provided at the axial center position of the buried pipe 7.

Further, the eccentricity of the mounting position of the guide shaft 11 may be performed for the purpose of correcting the deviation of the leading pipe 6 itself during press fitting, and the flow path is corrected by forming the hole at an eccentric position. .

When the installation of the guide shaft 11 is completed, the two erectors 12 and 13 are attached to the guide shaft 11 so as to be rotatable and slidable.

Next, the distal end 7' of the buried pipe 7 is slightly crushed, and a retaining plate 14 made of a steel plate is installed at the rear end of the leading pipe 6, as shown in FIGS. 3 to 5. It goes without saying that, prior to crushing the buried pipe 7, hardening of the soil by injecting a chemical solution is carried out to prevent cave-ins.

Further, the internal space of the guide pipe 6 is used as a machine room for a submersible pump or the like or as an evacuation room in case of an emergency.

Once the earth retaining board 14 has been installed, the buried pipe 7 is stretched to the width of the winding segment (20
~30cm) in the retreating direction, and excavate the outside of the buried pipe 7 to widen it. And the Erector 1
2 and 13, the retaining segment 15 is rolled up as shown in FIG.

When the winding of segments of a predetermined length is completed, a retaining plate 17 is installed at the rear end of the enlarged diameter portion (connection chamber 1) to retain the soil.

Once the earth retaining segment 15 has been rolled up in this way, an internal segment (not shown) is rolled up inside it, and cement mortar is poured between both segments by an appropriate method to construct an underground connection hall. Complete.

Further, when the winding of the earth retaining segment 15 of the underground connection hall is completed, a small diameter guide pipe (not shown) is press-fitted from inside the hall toward the ground surface to form the entrance and exit of the hall. still,
The construction method of forming a hall entrance/exit from inside a hall for underground connection using the guide small-diameter pipe is an invention of the inventor of the present application, and is disclosed as Japanese Patent No. 650553.

When the construction of the connecting chamber is completed, the branch pipe 3 is press-fitted using the same construction method as the main pipe 2, and after its tip faces into the chamber 1, a flow path is formed in an appropriate shape.

Further, the buried pipe 7 is extended forward by forming another working hole in front of the meeting place 1 and press-fitting the buried pipe toward the meeting place 1 through the working hole.

Next, the effects of the present invention will be explained. First, in the present invention, the buried pipe 7 is press-fitted to a predetermined position, and then the buried pipe 7 is
Since the earth retaining segment is erected by crushing it slightly from its tip and then digging out and expanding the buried outer part, the work surface (exposed surface of exposed soil) can be limited to a minimum. Not only that, but the amount of soil removed will also be significantly reduced. As a result, the buried pipe 7 helps prevent cave-in accidents and also serves as an evacuation site in case of an emergency, significantly improving work safety, and having almost no impact on the upper geology, allowing other existing underground structures such as power equipment to be removed. There is no possibility that this will be adversely affected.

In addition, the leading pipe 6 functions to prevent landslides near the cutting edge in constructing the connection chamber 1, and
The inside of the lead pipe 6 can be used as a work room or a shelter in case of an emergency, and all work materials can be brought in through the buried pipe 7, which not only greatly improves work safety and efficiency. There will be no hindrance to ground transportation, etc.

Further, an erector guide shaft 11 is disposed parallel to the axis of the buried pipe 7, and its tips are fixed to the support columns 9 and 10, and an erector guide shaft 12 disposed on the shaft 11,
13 is used to wind up each segment 15, 16, by accurately regulating the direction and horizontality of the leading pipe 6, each segment 15, 16 is aligned with the axis of the buried pipe 7. It can be easily rolled up perpendicular to O.

Furthermore, when the erector guide shaft 11 is eccentrically set a certain distance c from the axis O of the buried pipe 7, and each segment is wound up with reference to the erector 12 inserted therein, as shown in FIG. The radius of curvature R of the connecting flow path between the branch pipe 3 and the main pipe 2 can be made large, which is advantageous in terms of ensuring flow smoothness, and in the event that the leading pipe 6 is deviated in the press-fitting direction. In such a case, the deviation in the direction of the pipe can be corrected by eccentricizing the guide shaft 11 by an appropriate amount and forming the shaft at an eccentric position.

Although the above-mentioned embodiment describes the construction of an underground connection facility for sewerage, it goes without saying that the present invention can be applied to the construction of underground connection facilities for other facilities such as water supply, electric power, and communication lines.

As mentioned above, the present invention is a construction method that has no adverse effects on surface traffic or other underground structures, is excellent in safety and economy, and has high practical utility.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an example of an implementation site of the present invention. FIG. 2 is a longitudinal sectional view of the leading tube. FIGS. 3, 4, and 5 are a longitudinal side curved view, a transverse sectional view, and a longitudinal sectional front view showing the tuyere part during construction of the connecting chamber. FIG. 6 is a longitudinal cross-sectional side view of the connecting chamber, showing a state in which the winding of the segments has been completed. FIG. 7 is a cross-sectional view when the connecting chamber is formed at an eccentric position. A Intersection point 1 Underground connection hall 6 Leading pipe 7 Buried pipe 11 Erector guide shaft 12, 13 Erector 15 Earth retaining segment Patent applicant Yoshisei Minami Application agent Patent attorney Shigeo Iwakoshi Figure 1 Figure 2

Claims (3)

[Claims] (1) Connect the buried pipes (7) to the rear of the steel lead pipe (6) in sequence, and use the press-in device (5) to connect the lead pipe (6) and the buried pipe (7) to the underground connection hall (1). After press-fitting to the construction point, the front end of the guide pipe (6) is closed, and then the buried pipe (7) is crushed by a certain distance from its tip to the rear, and the outside of the crushed part is excavated and expanded in diameter. At the same time, the retaining segment (15) is rolled up, and the tip of the buried pipe (7) is repeatedly crushed, excavated and expanded in diameter, and rolled up the retaining segment (15) according to the fixed dimensions. A method for constructing a hall for underground connection, characterized by expanding the diameter of the pipe and using the enlarged diameter part as a hall. (2) In claim 1, the erector guide shaft (11) is parallel to the axis (O) of the buried pipe (7).
The earth retaining segment is constructed using erectors (12) and (13) that are rotatably and slidably inserted into the erector guide shaft (11), and the front end thereof is fixed to the leading pipe (6). (15) A method of constructing an underground connection hall in which the parts are rolled up one after another. (3) An erector guide shaft (11) is arranged eccentrically from the axis (0) of the buried pipe (7) by a certain distance, and an erector is rotatably and slidably inserted into the erector guide shaft (11). (12) and (13) are used as a reference, and earth retaining segments are sequentially wound at positions eccentric from the axis (O) of the buried pipe (7) based on this as a reference. How to construct a hall for underground connection.