JPH09317383A - Method for burying main pipe and branch pipe in buried pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the construction period by a method wherein a branch pipe is pushed by a pipe jacking method from a starting shaft to the vicinity of a predetermined main pipe laying position, a main pipe is laid in a cut trench excavated by a cut-and-cover method, and the branch pipe is connected to the main pipe, and the trench is backfilled. SOLUTION: A jacking machine is set in a waste water pit 4 and a jacking direction of a branch pipe 2 is determined based on an axial center of a main pipe 1 to be laid to push the pipe 2 by means of the jacking machine. After the branch pipe 2 is laid to a point excluding a point right above the main pipe 1 to be laid by a pipe jacking method, the jacking machine is returned to the side of the pit 4. A cut trench 7 for successively laying the pipe 1 is excavated from a point where the jacking operation of the pipe 2 is completed. Simultaneous with the completion of excavation of the trench 7, the pipe 1 is lowered, while suspended, from above the trench 7 to lay it in the trench 7. A connection operation of the pipe 2 having been pushed and the pipe 1 is performed using a connection branch pipe 2a, following which the trench 7 is backfilled to complete the construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for burying a main pipe and a branch pipe in a buried pipe, and in particular, the precision of propelling the branch pipe relative to the main pipe is unnecessary, and the total construction period from excavation to backfilling can be shortened. A method for burying a main pipe and a branch pipe in a pipe.

[0002]

[Prior art]

(1) The first prior art, "JP-A-62-13748"
A method of connecting the branch pipe 52 to the underground main pipe 51 described in "9" will be described with reference to FIG. The steps of the first conventional technique will be described below. The buried main pipe 51 is buried. (Propulsion method or excavation method) If the excavation method is used, the excavation groove is backfilled. The vertical hole 54 is excavated to a position right above the embedded main pipe 51.
From the vertical hole provided at an appropriate position such as a sidewalk to the vertical hole 5
4, the underground branch pipe 52 is inserted and buried in an appropriate depth direction. The tip portion 55 of the branch pipe 52 and the opening portion at a position directly above the underground buried main pipe 51 are buried so as to be connected by interposing a vertical pipe 56. Backfill the trench.

FIGS. 11 and 12 show a conventional technique in which the buried main pipe 81 does not have an open cut groove. (2) A method of connecting the branch pipe 82 to the buried main pipe 81 which is the second conventional technique will be described with reference to FIG. A propulsion pipe construction machine (not shown) is installed in the waste water box 84 installed inside the fence 83 of the household. A large-diameter sheath pipe 86 is propelled from the sewage box 84 side to the buried main pipe 81 buried in the ground of the road 85. While confirming the position of the buried main pipe 81, a branch pipe 82 made of a double pipe is laid between the predetermined position of the buried main pipe 81 and the waste water tank 84 by utilizing the space inside the sheath pipe 86. A connection hole between the buried main pipe 81 and the branch pipe 82 is opened, and a paste cement is filled in the gap between the inner and outer pipes of the double pipe.

(3) A buried main pipe 81 which is a third conventional technique.
A method of connecting the branch pipe 82 will be described with reference to FIG. A propulsion pipe construction machine (not shown) is installed in the waste water box 84 installed inside the fence 83 of a home or the like. This sewage box 84
Buried main 81 which is buried in the underground of road 85 from the side
A branch pipe 82 made of a double pipe is laid toward the side. A connection hole between the buried main pipe 81 and the branch pipe 82 is opened, and a paste cement is filled in the gap between the inner and outer pipes of the double pipe.

FIGS. 13 and 14 show a conventional technique in which an excavation groove 87 of a buried main pipe 81 is constructed. (4) A fourth conventional technique for connecting the branch pipe 82 to the buried main pipe 81 will be described with reference to FIG. A buried main pipe 81 is laid in an excavation groove 87 that has been excavated in a road 85. The buried main 81 is backfilled until it is hidden.
The branch pipe 82 is propelled in the direction of the arrow from the waste water box 84 installed inside the fence 83 of a home or the like to the upper portion of the buried main pipe 81 in the excavation groove 87. Buried main pipe 8 via connecting branch pipe 82c
After being connected to 1, the excavation groove 87 is backfilled.

(5) A buried main pipe 81 which is a fifth conventional technique.
A method of connecting the branch pipe 82 will be described with reference to FIG. A buried main pipe 81 is laid in an excavation groove 87 that has been excavated in a road 85. The buried main 81 is backfilled until it is hidden.
The branch pipe 82 is propelled in the direction of the arrow from the inside of the excavation groove 87 toward the waste water box 84 installed inside the fence 83 of a home or the like. This branch pipe 82 and the buried main pipe 81 are connected to each other.
Connect by c. The excavation groove 87 is backfilled.

[0007]

However, each of the above prior arts has the following drawbacks. (1) In the first conventional technique, an underground buried main pipe 51 is provided by excavation.
When this is done, since this excavation part is a normal road, it is necessary to use the ground. Therefore, after laying the underground buried main pipe 51, the excavation groove is once backfilled. Then underground underground main 5
1. Push the branch pipe 52 up. In order to attach the branch pipe 52 to the underground buried main pipe 51, it is necessary to reopen the vertical hole 54 in the upper portion of the underground buried main pipe 51, which causes a problem that the construction period is extended and the construction cost is increased. there were. (2) In the second conventional technique, the construction machine becomes large because the large-diameter sheath tube 86 is propelled. Therefore, a large vertical shaft is required. Power increases as the amount of soil removed increases.
The cost of soil disposal increases as the amount of soil discharged increases. In addition, if it cannot be installed on the side of a building such as a home, this construction method becomes impossible. 12 above the axis of the buried main 81
Since there is a regulation to connect the branch pipe 2 within the range of 0 degree, the branch pipe 2 cannot be connected in a straight line when the soil cover is shallow. Therefore, the first branch pipe 82a and the second branch pipe 82b must be connected to the buried main pipe 81 from the sewage box 84 installed inside the fence 83 of a home or the like by two steps of excavation and propulsion. It causes extension and increase of construction cost. The first
In the fourth conventional technique, since the buried main pipes 51, 81 do not have the cut grooves, the branch pipes 52, 82 or the first branch pipe 82a.
After the propulsion construction, the propulsion construction machine collects the waste water box 84 from the starting side. Since the sheath pipe 86 has a large diameter, it is necessary to remove the above-ground structure and complete the laying of the buried pipe, and then to reconstruct the structure again, resulting in an extension of the construction period and an increase in the construction cost. In addition, the connection between the buried main pipe 81 and the branch pipe 82 is darker and less visible than in the open-cut methods like the fourth and fifth conventional techniques, and therefore the reliability of the connection between the buried main pipe 81 and the branch pipe 82 is high. Is reduced.

(3) In the third prior art, as in the second prior art and the fourth and fifth prior art, the position of the buried main pipe 81 is confirmed in the large-diameter sheath pipe 86 or from the cut groove 87. Can not. Therefore, when the construction accuracy of the propulsion pipe is poor, the position of the branch pipe 82 with respect to the buried main pipe 81 may be displaced. In this case, the branch pipe 82 cannot be connected to the buried main pipe 81. If the soil cover is shallow, the same problem as in the second conventional technique occurs. FIG. 13 and FIG. 14 show a conventional technique in the case where the excavation groove 87 of the buried main pipe 81 is constructed. (4) In the fourth and fifth conventional techniques, the branch pipe 82 cannot be constructed unless the excavation groove 87 is constructed first, and the backfilling work of the excavation groove 87 is completed until the propelling work of the branch pipe 82 is completed. The work period is extended because it cannot be performed. First as above
In the fifth conventional technique, all the buried main pipes 51, 81 are buried and then the branch pipes 52, 82 are buried, and the branch pipes 52, 82 are buried.
However, the above problems (1) to (4) have been encountered in order to connect the buried main pipes 51 and 81 previously buried.

The present invention has been made by paying attention to the above-mentioned problems of the prior art, and the embedding order of the main pipes 51, 81 and the branch pipes 52, 82 is reversed as compared with the prior art. That is, by first burying the branch pipe and then burying the main pipe, and connecting the branch pipe previously buried to this main pipe, the construction period can be significantly shortened and the main pipe and the branch in the buried pipe can be reduced in cost. It is intended to provide a connection method with a pipe.

[0010]

In order to achieve the above object, the first invention of the method for burying a main pipe and a branch pipe in a buried pipe according to the present invention is a main pipe 1 and a branch pipe 2.
In the method of connecting the main pipe and the branch pipe in the buried pipe consisting of, the branching is performed from the starting shaft 4 installed on the opposite side of the main pipe 1 to be laid to the vicinity of the main pipe 1 to be laid by the propulsion method. The first step of laying the pipe 2, the second step of laying the main pipe 1 in the excavation groove 7 excavated by the excavation method, the third step of connecting the branch pipe 2 to the main pipe 1, and the excavation groove 7 It is characterized by comprising a fourth step of backfilling.

According to the first invention, after the branch pipe 2 is laid by the propulsion method from the starting shaft 4 installed on the opposite side of the main pipe 1 to be laid to the vicinity of the main pipe 1 to be laid, The main pipe 1 is laid in the excavation groove 7 excavated by the excavation method, the branch pipe 2 is connected to the main pipe 1, and the excavation groove 7 is backfilled to complete the construction of the buried pipe. Therefore, the branch pipe 2 is laid by the propulsion method before excavating the excavation groove 7. Therefore, it is not necessary to open the cut groove 7 for burying the main pipe 1 while the branch pipe 2 is laid. Therefore, the excavation groove 7 on the ground
The period of exclusive use of the opening is shortened. In particular, when the excavation groove 7 is located on the road 5 having a high traffic volume, the period of traffic congestion can be significantly shortened. Further, as in the first conventional technique, the underground buried main pipe 5 for backfilling the excavation groove 7 and further attaching the branch pipe 52 to the underground buried main pipe 51.
1. Since there is no step of reopening the vertical hole 54 in the upper portion, it is possible to shorten the construction period and the construction cost.

Compared to the fourth and fifth prior arts, the branch pipe 2 is first buried and then the excavation groove 7 for the main pipe 1 is excavated. Therefore, the branch pipe 2 is embedded and then the excavation groove 7 is excavated. The ground portion that will be the excavation groove 7 can be used freely until the time until.
Next, before connecting the branch pipe 2 to the main pipe 1, the excavation groove 7 is excavated and the main pipe 1 is laid. Then, since the worker enters the digging groove 7 and connects the main pipe 1 and the branch pipe 2 while checking them at present, the connection can be surely made. That is, unlike the second and third prior arts, the high propulsion accuracy of the branch pipes 82, 82a with respect to the embedded main pipe 81, which is caused by the absence of the cut groove above the embedded main pipe 81, becomes unnecessary. Therefore, unlike the second to fourth conventional techniques, it is not necessary to connect the branch pipes 82 in a straight line within a range of 120 degrees above the axis of the buried main pipe 81, and even if the soil cover is shallow, It is not necessary to open and cut the two branch pipes 82b.

A second invention of the method for burying a main pipe and a branch pipe in a buried pipe according to the present invention is characterized in that, in the first invention, the second step to the fourth step are continuously carried out.

According to the second aspect of the present invention, if the branch pipe 2 is laid by the propulsion method and the second step to the fourth step are carried out systematically in a short period of time, the main pipe 1 Since the period from the laying to the connection with the branch pipe 2 is shortened, the period of occupying the opening portion of the excavation groove 7 on the ground can be further shortened. In addition, the construction period of the first to fourth steps as a whole can be shortened.

A third invention of a method for burying a main pipe and a branch pipe in a buried pipe according to the present invention is, in the first invention, a laying plan in the vicinity of a main pipe laying scheduled position where the branch pipe is laid by the propulsion method. It is characterized in that it is located at an upper position except directly above the main pipe.

According to the third aspect of the invention, when the main pipe 1 is laid, the branch pipe 2 can be laid in the open / drain groove 7 without hindrance when the main pipe 1 is unloaded from above the open / drain groove 7. Therefore, the work of laying the main pipe 1 becomes easy. Further, when laying the main pipe 1, it is not necessary to avoid the branch pipe 2 in the horizontal direction and lower it, so that the width of the open-cut groove 7 can be reduced and the cross-sectional area of the open-cut groove 7 can be reduced. Therefore, the construction cost of the excavation groove 7 can be reduced.

A fourth invention of a method for burying a main pipe and a branch pipe in a buried pipe according to the present invention is, in the first to third inventions, after the branch pipe is laid by the propulsion method to a position near the main pipe to be laid. It is characterized in that the soil discharging device of the propulsion machine used in this propulsion method, or the cutter head and the soil discharging device are pulled back to the starting shaft side.

According to the fourth aspect of the invention, after propelling the branch pipe 2 to the vicinity of the main pipe 1 to be laid, the soil discharging device of the propulsion machine used in this propulsion method, or the cutter head and the soil discharging device are installed. Since it is pulled back to the vertical shaft 4 side for recovery, it is not necessary to open and cut the reaching vertical shaft for recovery. Therefore, it is not necessary to regulate the traffic on the road. Before excavating the excavation groove 7, this earthmoving device, or the cutter head and the earthmoving device can be collected and used for the next propelling of the branch pipe 2, and it is not necessary to wait for the excavation of the excavation groove 7.

A fifth invention of a method for burying a main pipe and a branch pipe in a buried pipe according to the present invention is, in the first to third inventions, after the branch pipe is laid by a propulsion method to a position near the main pipe laying planned position. It is characterized in that the cutter head of the propulsion machine used in this propulsion method, or the cutter head and the soil discharging device are taken out to the ground through the excavation groove.

According to the fifth aspect of the invention, if the excavation groove 7 is excavated immediately after propelling the branch pipe 2 to the vicinity of the position of the main pipe 1 to be laid, the soil discharging device of the propulsion machine used in this propulsion method. ,
Alternatively, the cutter head and the soil discharging device can be taken out from the excavation groove 7 to the ground. In this case, the work of collecting the soil discharging device of the propulsion machine or the cutter head and the soil discharging device is simple.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for burying a main pipe and a branch pipe in a buried pipe according to the present invention will be described below with reference to FIG.
~ It will be described in detail with reference to the drawing of FIG.

FIG. 1 is a diagram showing a first step in one embodiment of the present invention. A sewage box 4 as a starting shaft is installed inside the fence 3 of each household, and a road 5 is provided outside the fence 3. It has become. First, in the first step, the position of the axis O of the main pipe 1 to be laid is confirmed.

FIG. 2 is a view showing the second step, in which a propulsion machine (not shown) is installed in the waste water box 4, and the propelling direction of the branch pipe 2 from the position of the axis O of the main pipe 1 to be laid in the first process. And the branch pipe 2 is propelled by the propulsion machine. After the branch pipe 2 has been laid by the propulsion method to a position other than just above the main pipe 1 to be laid, the propulsion machine is collected on the side of the waste water box 4.

FIG. 3 is a diagram showing a third step, in which the excavation grooves 7 for laying the main pipe 1 are sequentially started from the place where the propelling work of the branch pipe 2 is completed.

FIG. 4 is a view showing the fourth step. When the excavation groove 7 is excavated in the third step and the main tube 1 is lowered while being suspended from above the excavation groove 7, the main tube 1 branches. It is laid under the cut groove 7 without being obstructed by the pipe 2.

FIG. 5 is a view showing a fifth step, in which the main pipe 1 is laid in the cut groove 7 at the same time as the connecting branch pipe 2a in the fourth step.
The connecting work between the branched pipe 2 and the main pipe 1 which have been already promoted is carried out.

FIG. 6 is a diagram showing the sixth step, and immediately after the connection work between the main pipe 1 and the branch pipe 2 in the fifth step is completed, the digging groove 7 is immediately formed.
Backfilling is completed and the construction is completed.

According to this embodiment, the branch pipe 2 is formed by the propulsion method.
Since it is possible to lay down and construct the subsequent process in a planned and continuous manner in a short period of time, the period dedicated to the opening of the excavation groove 7 on the ground can be greatly shortened, and the traffic congestion period of the road 5 can be shortened. The effect is remarkable. Further, since the excavation groove 7 is excavated before the branch pipe 2 is connected to the main pipe 1, and an operator can enter the excavation groove 7 and connect the main pipe 1 and the branch pipe 2 in the present state, the main pipe 1 And the branch pipe 2 can be reliably connected. Further, when the main pipe 1 is laid, the branch pipe 2 can be laid in the open / closed groove 7 without hindrance even if the main pipe 1 is lowered from above the open / closed groove 7, so that the main pipe 1 can be easily laid. Since it is not necessary to move the main pipe 1 in the horizontal direction, the cross-sectional area of the excavation groove 7 can be reduced, and the construction cost of the excavation groove 7 can be reduced.

An excavation propulsion apparatus disclosed in Japanese Patent Laid-Open No. 1-25880, which is an embodiment of the first propulsion machine used in the present invention, will be described with reference to FIGS. 7 and 8. As shown in FIG. 7, the cutter unit 61 is connected to the rotary shaft 67 by bolt-nut coupling the respective flanges. The rotary torque of the rotary shaft 67 is transmitted to the cutter unit 61 to excavate the ground. is there. The cutter portion 61 is composed of a fixed portion 62 and a front-back direction rotating portion 63, which is shown in FIG.
As shown by the alternate long and short dash line, the front-rear direction rotating portion 63 is attached by pins 64 so as to be able to fall forward in the propulsion direction. The reaction force of the front-rear rotating unit 63 during excavation is received by the reaction force receiver 66 connected to the cutter shaft 65.

The function and effect of the above configuration will be described. In FIG. 7A, the state in which the front-rear direction rotating portion 63 is indicated by a solid line indicates the time of normal excavation propulsion. In this case, excavation and propulsion is performed in a state where the cutter portion 61 is fixed at a normal position without being laid down. That is, the front-rear rotating unit 6
The ground 3 is excavated by protruding from the tip end opening of the rocking blade opening 79 and rotating at a rotation diameter larger than the opening diameter.

Next, when trouble occurs in the cutter unit 61 as a result of the excavation and propulsion, the procedure for collecting the cutter unit 61 and the drive device 68 in the starting pit (not shown) will be described. To do. As shown in FIG. 7 (B), when the direction correcting jack 73 and the swinging blade opening 79 are disconnected from each other and the direction correcting jack 73 is retracted to the stroke end,
The drive device 68 is in a state where the fixing to the swing blade 79 is released. Next, when the soil discharge pipe 76 is retracted in the direction of the starting pit by a predetermined distance L, the drive device 68 is released from the swing blade 79, and at the same time, the front-rear direction rotating portion 6 of the cutter portion 61 is released.
The tip of the swing blade mouth 79 comes into contact with the rear portion 3 from the rear side thereof, and thus the body 3 falls forward around the pin 64.

Then, as shown in FIG.
When the drive device 68 is rotated by rotating 6 from the start pit about the pipe axis by a predetermined angle, FIG.
The drive device mounting flange 69 shown in (B) is in a state of being displaced from the position of the direction correcting jack 73. Next, FIG.
As shown in (C), when the soil discharge pipe 76 is retracted from the start pit, the drive device 68 and the cutter unit 61 can be recovered to the start pit side.

FIG. 9 is a diagram showing an embodiment of a second propulsion machine used in the present invention. The same parts as those of the first propulsion machine described with reference to FIGS. 7 and 8 are designated by the same reference numerals. Description will be omitted, and only different parts will be described. The cutter portion 61a extends and contracts in opposite directions.
It is composed of two cylinders 10a and 10b having a and 11b, and two cutter bits 12a and 12b are installed on the cutters 11a and 11b, respectively.
In addition, the cylinder 10a, 10b also has a cutter bit 13a,
13b is installed.

The operation of the above configuration will be described. During normal excavation propulsion, when the cutters 11a and 11b are extended by the cylinders 10a and 10b and the cutter portion 61a is rotated in the direction of arrow S, the ground is cut by the cutter bits 12a, 12b and 13a, 13b so as to be in the state shown in FIG. Is excavated. Next, after excavation and propulsion, when the cutter unit 61a and the drive device 68 are to be collected in the waste water container 4, the cutters 11a and 11 are driven by the cylinders 10a and 10b.
When b is contracted and moved in the direction of arrow T, the cutter unit 6
1a can be collected in the waste water container 4.

[Brief description of drawings]

FIG. 1 is a diagram showing a first step of an embodiment of a method of burying a main pipe and a branch pipe in a buried pipe according to the present invention.

FIG. 2 is a diagram showing a second step following FIG.

FIG. 3 is a diagram showing a third step following FIG. 2;

FIG. 4 is a diagram showing a fourth step following FIG. 3;

FIG. 5 is a diagram showing a fifth step following FIG. 4;

FIG. 6 is a diagram showing a sixth step following FIG. 5;

FIG. 7 is a diagram showing a first propulsion machine used in the present invention,
(A) is a figure which shows a 1st process and (B) is a 2nd process.

FIG. 8 is a diagram showing a first propulsion machine used in the present invention,
(A) is a 3rd process, (B) is a front view of (A), (C) is a figure showing a 4th process.

FIG. 9 is a diagram showing a second propulsion machine used in the present invention,
(A) is a side sectional view and (B) is a front view.

10A and 10B are views showing a first conventional technique, in which FIG. 10A is a conceptual cross-sectional view of a connection state between a branch pipe and a main pipe, and FIG. 10B is a detailed cross-sectional view of a main part.

FIG. 11 is a diagram showing a second conventional technique.

FIG. 12 is a diagram showing a third conventional technique.

FIG. 13 is a diagram showing a fourth conventional technique.

FIG. 14 is a diagram showing a fifth conventional technique.

[Explanation of symbols]

 1 Main pipe 2 Branch pipe 2a Connection branch pipe 3 Fence 4 Sewage basin (starting shaft) 5 Road 7 Excavation groove 7a Planned excavation groove 10a, 10b Cylinder 11a, 11b Cutter 12a, 12b, 13a, 13b Cutter bit O Main pipe planned to be laid Axis of

Claims (5)

[Claims] 1. A method of burying a main pipe and a branch pipe in a buried pipe, which comprises the following steps. First step: The branch pipe is propelled from the starting shaft side to the vicinity of the planned main pipe laying position by the propulsion method. Second step: A main pipe is laid in an excavation groove excavated by the excavation method. Third step: The branch pipe is connected to the main pipe. Fourth step: backfilling the trench. 2. A method for burying a main pipe and a branch pipe in a buried pipe according to claim 1, wherein the second step to the fourth step are continuously carried out. 3. The book in the buried pipe according to claim 1, wherein the vicinity of the main pipe laying planned position where the branch pipe is laid by the propulsion method is an upper position except immediately above the main pipe to be laid. Pipe and branch pipe burying method. 4. The earth discharging device for a propulsion machine used in this propulsion method, or the cutter head and the earth discharging device, after branch pipes have been laid by the propulsion method up to the vicinity of the main pipe position to be installed. A method for burying a main pipe and a branch pipe in a buried pipe, characterized in that and are pulled back to the starting shaft side. 5. A cutter head of a propulsion machine used in this propulsion method, or a cutter head and a soil discharging device, after branch pipes have been laid by the propulsion method up to the vicinity of a main pipe laying planned position. A method for burying a main pipe and a branch pipe in a buried pipe, which is characterized by taking out the ground from a cut groove.