JP4522616B2 - Automatic pressure regulation mud discharge mechanism of excavated sediment in a leading excavator for small diameter pipe propulsion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a leading excavator having a small diameter such as a nominal diameter of 700 mm to 200 mm, and the above-described leading excavator is used to continuously install the pipes while excavating and drilling by a control device installed in the start shaft. The excavated earth and sand collected by excavating the face by agitation and the high-concentration muddy water pumped separately by the mud pipe are stirred and mixed to obtain the excavated earth and sand mud concentration to which fluidity is given, and this is taken out to the outside. In connection with a small-diameter pipe propulsion method that adopts a known mud-type propulsion method to go, in order to prevent collapse of the face by holding the internal pressure of the excavated mud mud concentration at a predetermined pressure in the method, the excavated sediment The present invention relates to an automatic pressure regulation and drainage mechanism for excavated earth and sand mud, which is capable of exerting an open / close valve action that can be controlled to intermittently carry out the mud.
[0002]
[Prior art]
As is known, in order to implement the mud type propulsion means by the conventional excavation propulsion machine A for the small-diameter propulsion method, as shown in FIG. 4, a cutter provided at the head of the excavation outer cylinder a b is rotated by a cutter motor to excavate the face, and the excavated earth and sand E1 obtained thereby is introduced into the front cutter chamber C. Furthermore, the high-concentration mud water E2 is pumped through a separately provided high-concentration mud hose d and filled in the front cutter chamber C to maintain the pressure on the face, thereby preventing the face from collapsing. The excavated earth and sand E1 and the high-concentration mud water E2 are agitated and mixed, thereby obtaining the fluidized excavated earth and sand mud concentrate e. Here, in the illustrated example, the high-concentration mud water E2 is discharged from the tip discharge port f of the cutter b through the high-concentration mud water hose d, and the lubricant S supplied from the hoses g1 and g2 is known as well. Is filled in the tail void on the outer periphery of the outer cylinder a for excavation.
[0003]
For the excavated sediment mud concentration e obtained in the front cutter chamber C described above, in order to avoid the risk of the face being excavated by the cutter b being unstable and collapsing when the internal pressure is reduced, For the purpose of maintaining the internal pressure at a predetermined pressure or higher, the discharge valve i provided in the discharge path h communicating with the front cutter chamber C is intermittently operated by the operation of the compressor k connected via the air hose j. The excavated sediment mud e that is intermittently discharged by the opening and closing operation can be carried out by the vacuum force of the air hose j through the soil discharge pipe m. Here, in FIG. 4, n is a start shaft, p is a bearing wall, q is a main jack, and r is a strut.
[0004]
However, as described above, the soil discharge valve i is configured so that the rubber valve t can be opened and closed by the air pressure provided by the air hose j. As a result, the high-concentration mud water E2 is normally discharged from the groundwater pressure +0. Management is performed with 0.02 MPa as the lower limit and 0.05 MPa as the upper limit.
Therefore, the earth discharge valve i configured as described above has a considerably large outer diameter and total length, so that the leading excavator with a nominal diameter of about 700 mm can be internally installed. Even if it is to be adopted for a smaller diameter propulsion method, it is too large to be stored, and an air tank for applying air pressure to the soil discharge valve i must also be stored in the excavation outer cylinder a. In the case where it is necessary, the constraints on the storage pace are further weighted.
[0005]
[Problems to be solved by the invention]
The present invention has been studied with respect to the problems of the leading excavator for the conventional small-diameter pipe propulsion method described above, and relates to the automatic pressure regulation / drainage mechanism for excavated sediment mud according to claim 1 so far. In order to carry out the excavated sediment mud concentration indirectly obtained by stirring and mixing the excavated sediment and high-concentration mud water as described in the above-mentioned conventional example without adopting a vacuum discharge valve such as In the interior rotor so that it can rotate freely on the outer cylinder, a drainage inlet is opened at the eccentric position, and the stator internally attached to the outer cylinder for digging is periodically driven by the rotation of the rotor. By drilling the discharge outlet so that it is in communication with the above discharge inlet, the internal pressure of the excavated sediment mud is undesirably lowered by the intermittent cycle according to the rotational speed of the rotor. And the trouble that the face collapses, Attempting manner can completely extinct even if by a small-diameter jacking method such that is its purpose.
[0006]
In the second aspect, in the automatic pressure regulating mud discharge mechanism according to the first aspect, the cutter chamber, the intermediate chamber, and the pressure chamber of the front side chamber in the configuration according to the first aspect described above are each configured to remove the rotary cutter. In addition to communicating with the first communication port of the wearing partition and the second communication port of the rotor, the rotary partition plate of the rotor is mounted in the pressure chamber, thereby It is possible to make the structure on the leading side of the leading excavator firmly, and in the cutter chamber and the intermediate chamber connected to the front side chamber and in the pressure chamber, the excavated sediment and high-concentration mud are thoroughly mixed in order and ideal The fluidized excavated sediment mud can be smoothly transported out.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a rotary cutter for excavating a face is provided at the head of a rotor that is rotatably driven by a digging outer cylinder. A front side chamber on the rear side of the rotary cutter is provided for obtaining the excavated earth and sand mud concentration by stirring and mixing of the excavated earth and sand by the cutter and the high-concentration mud water separately pumped by the mud pipe. An opening / closing mechanism for holding the internal pressure of the excavated sediment mud in the front side chamber above a predetermined pressure is interposed between the discharge chamber formed by the stator provided on the outer cylinder and flows into the discharge chamber. In the leading digging machine for the small-diameter pipe propulsion method, the excavated sediment mud concentration is discharged through the mud pipe by a vacuum force, and the opening and closing mechanism section described above is a rotation formed on the rotor. On the partition plate, A drainage inlet that is eccentric from the axial center of the outer cylinder and opens to the front chamber is formed, and the fixed partition plate formed in the stator attached to the rotary partition plate includes a rotor Automatic adjustment of excavated earth and sand in a leading digging machine for a small-diameter pipe propulsion method, characterized in that a drainage outlet of the opening is drilled so as to be periodically communicated with the above-mentioned soil inlet by rotation drive Trying to provide a pressure mud mechanism.
[0008]
In the second aspect of the present invention, in the configuration of the first aspect, the front side chamber includes a cutter chamber in the vicinity of the rotary cutter, and an outer cylinder for digging through the first communication port provided in the rotary cutter attaching partition plate. It is formed by an intermediate chamber formed between the rotor and a pressure chamber mounted on the rotary partition plate of the rotor through the intermediate chamber and a second communication port provided in the rotor. It is said.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below with reference to FIGS. 1 to 3, and the leading excavator 1 will be described with reference to FIG. 4 in the same manner as the leading excavator for the small-diameter pipe propulsion method described above. 1, the rotor 3 that is rotatably mounted on the outer cylinder 2 for excavation is provided with a rotating cutter 4 for excavating a face not shown. And the excavated earth and sand E1 excavated by the rotation of the rotary cutter 4 and the high-concentration mud water E2 separately pumped by the mud pipe 5 built in the outer cylinder 2 for excavation and discharged from the discharge port 5a in the illustrated example, The excavated sediment mud E is agitated, mixed and fluidized by the rotary cutter 4 and is collected in the front side chamber 6 provided on the rear side of the rotary cutter 4 described above. In the leading excavator 1 disclosed in the figure, the excavation outer cylinder 2 is driven by the cutter motor 4a attached to the rear partition wall 7a of the stator 7 fixed to the excavation outer cylinder 2. The rotor 3 that is rotatably supported at the shaft center XX is internally mounted by the outer cylinder 2 for digging and the stator 7, and the rotary cutter formed on the front side of the rotor 3 is attached. In the partition plate 3a, a pair of rotary cutters 4 are installed so as to be rotatable around the oblique axes L1 and L2 as known in the art.
[0010]
In the first aspect, the front side chamber 6 and the discharge chamber 8 formed by the stator 7 provided in the digging outer cylinder 2 described above are further provided in the front side chamber 6. With respect to the internal pressure of the excavated earth and sand mud concentration E, an opening / closing mechanism unit 9 is provided so that it can always be maintained at a predetermined pressure or higher.
The opening / closing mechanism 9 can exhibit the same function as the conventional soil discharge valve i, but a single member is manufactured separately like the soil discharge valve i, and this is connected to the predetermined soil discharge path h. As described in detail below, the excavated sediment mud concentration is provided by inserting the earth discharge inlet 3b and the earth discharge outlet 7b at the appropriate position of the rotor 3 and the appropriate position of the stator 7, respectively. E is intended to be intermittently carried out by the rotational drive of the rotor 3.
[0011]
That is, as can be seen from FIGS. 1 and 3, the opening / closing mechanism 9 is located on the rotary partition plate 3c formed on the rotor 3 described above, and is eccentric from the axis XX of the outer cylinder 2 for digging, The chamber 6 is provided with an open earth discharge inlet 3b and is located on the fixed wall wall plate 7c of the stator 7 attached to the rotating partition plate 3c of the rotor 3 described above. The earth discharge outlet 7b opened at a position where it communicates with the above earth discharge inlet 3b is periodically formed by driving.
Therefore, when the above-described configuration is used, the rotational speed of the rotor 3, that is, the rotational speed of the rotary cutter 4 is specified, so that the intermittent drainage inlet of the rotor 3 is provided at every time with the passage of time. The excavated earth and sand mud concentrate E is discharged from the front side chamber 6 into the earth discharge chamber 8 in the stator 7 through the earth discharge outlet 7b from the stator 3b, and the waste mud connected to the discharge chamber 8 is connected. It will be carried out by the vacuum force through the pipe 10 as is known, so that the internal pressure of the excavated sediment mud concentration E in the front side chamber 6 will drop below the desired pressure value due to its excessive discharge. As a result, the face can be prevented from collapsing.
[0012]
Next, when claim 2 is explained, the front side chamber 6 in claim 1 is configured as follows.
That is, the front side chamber 6 is formed by sequentially connecting the intermediate chamber 6b and the pressure chamber 6c from the cutter chamber 6a in the vicinity of the above-described rotary cutter 4 to the rear side, and more specifically, the cutter chamber 6a. This is a space formed by the above-mentioned rotating cutter attaching partition plate 3a and a peripheral wall 3d projecting from the front end side thereof, in which the rotating cutters 4 and 4 are housed, and the intermediate chamber 6b The cutter chamber 6a communicates with the cutter chamber 6a through a first communication port 6d provided in the rotary cutter attaching partition 3a.
The intermediate chamber 6b is formed so as to be separated from the outer cylinder 2 for digging and the rotor 3, and the intermediate chamber 6b is connected to the pressure chamber in the rotor 3 via a second communication port 6e provided in the rotor 3. 6c.
[0013]
Therefore, when the front chamber 6 according to claim 2 is adopted, the assembly work is facilitated by fixing the stator 7 and the rotor 3 and the rotary cutter 4 to the outer cylinder 2 for excavation. Since the cutter chamber 6a passes through the first communication port 6d, the intermediate chamber 6b, the second communication port 6e, and the pressure chamber 6c, fluidization by mixing the excavated earth and sand E1 and the high-concentration mud water E2 is sufficiently performed. Therefore, the excavated sediment mud E can be smoothly carried out. Reference numeral 11 denotes a direction correcting jack for correcting the direction of advance of the leading excavator 1 as is known.
[0014]
【The invention's effect】
Since the present invention is configured as described above, the rotor according to the first aspect of the present invention is not limited by the idea of installing the earth removal valve separately configured as in the prior art in the leading excavator. Was opened so as to be in communication with the discharge outlet of the opening in the stator every rotation, so that the interior member can be installed without installing a separate discharge valve. As a result, the excavated sediment mud concentration can be intermittently carried out, and as a result, during the excavation work by the leading excavator, the face being excavated by the rotary cutter is caused by the decrease in internal pressure due to the excavated sediment mud concentration. It is possible to reliably prevent the danger of collapse, and therefore, even if a very thin outer cylinder is used for the leading excavator, an extremely safe and efficient small-diameter pipe propulsion method is efficiently used. Conducted Rukoto is possible.
[0015]
Next, a second aspect of the present invention relates to the front side chamber of the first aspect, wherein the cutter chamber and the intermediate chamber are communicated by the first and second communication ports by the rotor, the stator and the outer cylinder for digging. And because it is configured by the pressure chamber, it can be manufactured easily, the excavated sediment and the high-concentration mud in the front side chamber can be sufficiently mixed, and excavation in a satisfactory fluidized state. Since the sediment mud concentration can be obtained, the above-mentioned effect by the automatic pressure regulating mud discharge mechanism according to claim 1 can be achieved with high reliability.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view of a main part showing a leading excavator for a small-diameter pipe propulsion method according to claims 1 and 2 of the present application;
2 is an enlarged side view taken along line II-II in FIG.
FIG. 3 is an enlarged cross-sectional side view taken along the line III-III in FIG.
FIG. 4 is a schematic front view of a main part longitudinal section showing a conventional excavator for a small-diameter pipe propulsion method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leading excavator 2 Drilling outer cylinder 3 Rotor 3a Rotating cutter mounting partition plate 3b Soil inlet 3c Rotating partition plate 4 Rotating cutter 5 Mud pipe 6 Front side chamber 6a Cutter chamber 6b Intermediate chamber 6c Pressure chamber 6d First Communication port 6e Second communication port 7 Stator 7a Drainage outlet 7c Fixed partition plate 8 Discharge chamber 9 Opening / closing mechanism 10 Drainage pipe E Excavation sediment mud concentration E1 Excavation sediment mud E2 High concentration mudwater XX Shaft of outer cylinder for excavation heart

Claims (2)

A rotating cutter that excavates the face is provided at the head of the rotor that is rotatably mounted on the outer cylinder for excavation. The excavated earth and sand by the rotating cutter and the high-concentration mud water separately pumped by the mud pipe are provided. A front side chamber on the rear side of the rotary cutter from which excavated sediment mud concentration is obtained by agitation and mixing, and the front side is formed between the front side chamber and a discharge chamber formed by a stator provided in the outer cylinder for excavation An open / close mechanism is provided to keep the internal pressure of the excavated sediment mud in the chamber above a predetermined pressure so that the excavated sediment mud flowing into the discharge chamber is discharged via the mud drain pipe by vacuum force. The above-described opening and closing mechanism portion for the small-diameter pipe propulsion construction method is configured such that the opening and closing mechanism section is eccentric to the rotating partition plate formed on the rotor and opens to the front side chamber from the axis of the outer cylinder for digging. Exhaust An inflow port is perforated, and a fixed partition plate formed in the stator attached to the rotating partition plate is opened so as to be periodically communicated with the earth discharge inlet by the rotational drive of the rotor. An automatic pressure regulation mud drainage mechanism of excavated soil in a leading digging machine for small-diameter pipe propulsion method, characterized in that a drainage outlet is drilled. The front side chamber includes a cutter chamber in the vicinity of the rotary cutter, an intermediate chamber formed between the outer cylinder for digging and the rotor through a first communication port provided in the rotary cutter mounting partition, and the intermediate chamber and the rotor. And a pressure chamber mounted on the rotary partition plate of the rotor through a second communication port established in the step of the digging earth and sand in the leading digging machine for small-diameter pipe propulsion method according to claim 1 Automatic pressure regulation mud discharge mechanism.

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