JP3940745B2 - Underground excavator used for pipe roof construction method - Google Patents

Description

  The present invention relates to an underground excavation machine used for a pipe roof construction method.

  Conventionally, when building underground spaces and tunnels directly under existing underground structures and pipelines in urban areas, in order to prevent the impact of the pipe roof construction method on the receiving construction, horizontal earth retaining, and the surrounding ground and surrounding structures. In many cases, countermeasures / reinforcement auxiliary methods are used. In such a case, the propulsion pipe row is first constructed by the propulsion method or the auger type cutting method, but a joint is required to connect adjacent steel pipes. The purpose of these adjacent steel pipe joints is to prevent the inflow of ground water in the connection and fitting locations of pipe roof steel pipes and to prevent the collapse of natural soil particles when constructing underground space. For this purpose, joints that always make connections on both sides of the steel pipe are necessary, which is a problem to be studied both economically and constructionally.

  As described above, when the pipe roof construction method is adopted, the economical efficiency becomes a problem due to the prolonged construction period and the cost of the steel pipe joint. In addition, it has been observed in the past that the joint part cannot be removed or the adjacent steel pipe cannot be securely connected or fitted while the steel pipe is being inserted, and the propulsion is likely to be impossible. In addition, the underground underground space is excavated at the end of the pipe roof construction method, but it is also assumed that soil particles and groundwater from the ground will flow into the excavation tunnel due to poor connection of the joint, and are buried at the top of the underground tunnel. The impact on living-related pipelines and underground structures was great.

Therefore, Patent Document 1 proposes an underground excavation machine in which a groove cutting device for cutting a groove extending in the propulsion direction is provided on the outer periphery of the drilling hole at the rear portion of the excavation device. According to this technique, the propulsion pipe can be smoothly embedded without load by inserting the joint into the groove cut by the groove cutting device. However, this technique can suppress the dropout of the joint, but the construction of the excavator is complicated and expensive, and the work time associated with on-site connection cannot be saved, requiring a construction period.
JP 2001-123791 A

  The problem to be solved by the present invention is to solve these conventional problems, prevent the joint of the propelling pipe from falling off, etc., and can be securely connected and fitted, and with a simple structure for on-site connection It is an object of the present invention to provide an underground excavation machine that can be used for a low-cost pipe roof construction method that can save working time.

The configuration of the present invention that solves this problem is as follows.
1) a plurality of cutting devices are adjacent connecting at a predetermined interval, a propulsion tube in which a plurality of bodies consolidated at the rear of the excavating device is connected, the ground in front of the excavating device Press the propulsion tube from the rear An underground excavation machine used in a pipe roof construction method that embeds propulsion pipes that are connected while excavating, and is a joint for connecting with other propulsion pipes adjacent to both side surfaces of a plurality of connected propulsion pipes. provided with a rotary drilling blade surplus can digging to secure a space connecting portion which connects the joint and propulsion tube between the propulsion tube to the front of the drilling apparatus is provided, joint or connection of the propulsion tube outbreak portion The underground excavator used in the pipe roof construction method 2) of the adjacent excavation equipment , wherein a plurality of the propulsion pipes are connected to each other by joints and connecting parts so that they can be smoothly embedded in the ground. Rotating drilling blades interfere with each other It is composed of a plurality of small excavating blades that rotate and revolve so that one side of the opposing small excavating blade is formed long, and rotates and revolves so that only the sides of the excavator can be excavated with the cutting edge. The underground excavator used in the pipe roof construction method described in 1) 3) The ground used in the pipe roof construction method described in 1) or 2) above, in which the rotary excavation blades of adjacent excavation devices rotate in opposite directions. Middle excavation machine 4) The underground excavation machine used in the pipe roof construction method according to any one of 1) to 3) above, wherein a protrusion for preventing collapse of an overexcavation portion is provided on a side surface of the outer shell of the excavator.

  According to the present invention, since the joint and the connecting portion are inserted into the excessively dug portions, the joint can be smoothly embedded in the ground by preventing the joint from falling off. In addition, it is not necessary to provide a groove cutting device, and while forming a hole with the front rotary excavating blade, it also performs the excavation for the joint and the connecting portion at the same time, thereby simplifying the structure of the excavating device and reducing the cost. Can be planned. Furthermore, since the underground excavation machine has a structure in which a plurality of excavation apparatuses are connected in advance, the connection process at the site can be reduced and a plurality of bodies can be operated at the same time, thereby shortening the work period.

  In the present invention, the rotary excavating blades of adjacent excavating apparatuses are constituted by a plurality of small excavating blades that rotate and revolve so that they do not interfere with each other, and one side of the opposing small excavating blade is formed long, and the blade tip has a diamond shape. What you can dig is practical. The rotary excavating blades of the adjacent excavating devices are rotated in the opposite directions to improve straightness and prevent rolling. Protrusions are provided on the side surface of the outer shell of the excavator to prevent the collapse of the overexcavated portion due to vibration of the excavator. Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is an explanatory diagram of an excavator of the embodiment, FIG. 2 is a front view of the excavator of the embodiment, FIG. 3 is an explanatory diagram showing the locus of the rotary excavator blade of the embodiment, and FIGS. 6 is an explanatory view showing various examples of blade rotation, FIG. 6 is an explanatory view of the propulsion pipe of the embodiment, and FIG. 7 is an explanatory view showing a state of being constructed by the pipe roof construction method of the embodiment. In the figure, 1 is an excavator, 2 is an outer shell, 3 is a rotary excavator blade, 3a and 3b are small excavator blades, 3c is an excavator bit, 4 is a connecting member, 5 is a protrusion, 6 is a discharge port, and 7 is an exhaust port. Earth pipe, 7a is a gate, 8 is a direction correction jack, 9 is a motor with a speed reducer, 10 is a propulsion pipe, 11 is a joint , 11a is a joint, 12 is a fixed connection for connecting the propulsion pipes 10 , and C is a lining Concrete, F is a steel support, G is the ground, and T is a tunnel.

As shown in FIGS. 1 and 2, the excavation apparatus 1 of the present embodiment has two outer shells 2 having a circular cross section in parallel so that the outer shells 2 are spaced from each other at the same interval as the fixed connection portion 12 of the propulsion pipe 10. Connected by a connecting member 4, four small excavating blades 3 a and 3 b are attached to the front so as to rotate and revolve around a soil discharge pipe 7. The small excavation blade 3a is formed with a long side, and compared with the excavation locus of the short excavation blade 3b on the short side shown in FIG. 3 (b), the small excavation blade 3a on the long side is shown in FIG. 3 (a). Thus, both sides of the outer shell 2 can be dug (overcut). The small excavation blades 3a and 3b rotate so that they do not interfere with each other and revolve so that the rotation of the rotary excavation blades of the adjacent excavation apparatuses 1 is reversed. 4 and 5 show various examples of rotation. On the side surface of the outer shell 2, a protrusion 5 is provided so as to prevent a collapse after the excavation of an overexcavated portion excavated by the small excavation blade 3 a. The protrusion 5 also serves as a joint between the excavating devices 1. As shown in FIG. 6, the propulsion pipe 10 is formed of a steel pipe having the same diameter as the outer shell 2 of the excavator 1, and the two bodies are fixedly connected by fixed connection portions 12, and other propulsion adjacent to both side surfaces thereof. A joint 11a connected to the tube 10 is formed.

In the present embodiment, a propulsion device (not shown) using a jack is installed at the starting base at the start position of the tunnel T, and the excavating device 1 is disposed horizontally toward the ground G to drive the rotary excavating blade 3. The ground G is dug by pushing the rear end with the propulsion device. The excavated earth and sand is taken from the earth discharge port 6 and conveyed to the outside through the earth discharge pipe 7. At this time, both sides of the outer shell 2 are dug so that the drilling holes are excavated in a diamond shape with the small excavation blade 3a, and the connecting member 4 / projection 5 and the propulsion pipe 10 connecting the outer shells 2 to each other. It facilitates insertion of the joint 11a and the fixed connecting portion 12 . In addition, even if an excessively dug portion is about to collapse due to vibration of the excavator 1 or the like, it is restrained by the projection 5 of the outer shell 2, and the shape of the hole is maintained so that it can be buried without load or resistance.

Next, the propulsion device 10 connected to the rear end portion of the excavator 1 by the fixed connection portion 12 is connected in a state where it is connected to another adjacent propulsion tube 10 with joints 11a provided on both side surfaces thereof. Press to propel. As described above, the joint 11a and the fixed connecting portion 12 are smoothly inserted into the ground G by the overexcavated portion of the small excavating blade 3a and the protrusions 5 to prevent falling off during the propulsion. Thereafter, the propulsion pipe 10 is followed and propelled in order, and as shown in FIGS. 7A and 7B , the propulsion pipe 10 is connected to another adjacent propulsion pipe 10 by a joint 11a, and the arch-shaped, A ground or G-shaped pipe roof is formed to stabilize the ground G. As a result, the cost is reduced by using a special joint as 50% of the conventional one, and the propulsion pipe 10 connected to a plurality of construction periods can be inserted, so that it can be reduced by about 60%.

As described above, according to the present embodiment, the joint 11a and the fixed connecting portion 12 are inserted into the dug portion, so that the joint 11a can be prevented from falling off and the propulsion pipe 10 can be smoothly embedded in the ground. In addition, it is not necessary to provide a groove cutting device, and since excavation for the joint 11a and the fixed connecting portion 12 is simultaneously performed while forming a hole with the front rotary excavating blade 3, the structure of the excavating device 1 is simplified. Cost reduction. Furthermore, since the underground excavation machine has a structure in which a plurality of excavating devices 1 are connected in advance, the number of on-site connection processes can be reduced and a plurality of bodies can be operated at the same time. .

  INDUSTRIAL APPLICABILITY The present invention is useful for tunnel protection work, construction work for preventing ground collapse, and construction work for connecting pipes in the ground.

It is explanatory drawing of the excavation apparatus of an Example. It is a front view of the excavator of an example. It is explanatory drawing which shows the locus | trajectory of the rotary excavation blade of an Example. It is explanatory drawing which shows the various examples of rotation of the rotary excavation blade of an Example. It is explanatory drawing which shows the various examples of rotation of the rotary excavation blade of an Example. It is explanatory drawing of the propulsion pipe of an Example. It is explanatory drawing which shows the state constructed by the pipe roof construction method of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Outer shell 3 Rotating excavation blade 3a, 3b Small excavation blade 3c Excavation bit 4 Connecting member 5 Protrusion 6 Earth removal port 7 Earth removal pipe 7a Gate 8 Direction correction jack 9 Motor with reduction gear 10 Propulsion pipe 11 Joint part 11a Joint 12 Fixed connection part C Lined concrete F Steel support G Ground T Tunnel

Claims (4)

A plurality of cutting devices are adjacent connecting at a predetermined interval, a propulsion tube in which a plurality of bodies consolidated at the rear of the excavating device is connected, excavating ground in front of the excavating device Press the propulsion tube from the rear An underground excavation machine used in the pipe roof construction method that embeds the connected propulsion pipes in the ground, and has a joint for connecting with other propulsion pipes adjacent to both side surfaces of the plural propulsion pipes connected to each other. with a rotary excavation blade surplus can digging to secure a space connecting portion which connects the joint and propulsion tube between the propulsion tube to the front of the drilling apparatus is provided, the joint or coupling portion of the propulsion tube outbreak portion An underground excavation machine used for a pipe roof construction method, characterized in that a plurality of propulsion pipes are connected by joints and connecting portions so that they can be smoothly embedded in the ground.   The rotary excavator blades of adjacent excavators are composed of a plurality of small excavator blades that rotate and revolve so that they do not interfere with each other, and one side of the opposing small excavator blade is formed long, and the excavator is driven by the rotation and revolution to drive the excavator. The underground excavation machine used for the pipe roof construction method according to claim 1, wherein only the both sides of the pipe can be dug.   The underground excavation machine used for the pipe roof construction method according to claim 1 or 2, wherein the rotary excavation blades of adjacent excavation apparatuses rotate in opposite directions.   The underground excavation machine used for the pipe roof construction method in any one of Claims 1-3 which provided the protrusion which prevents collapse of the overexcavation location in the side surface of the outer shell of a drilling apparatus.

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