JP2001200551A - Trench excavation method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trench excavation method capable of being carried out by a simple stage of works and its device even when a trench excavation is carried out between preceeding panels. SOLUTION: A rod equipped with an excavator having a plurality of jet nozzles is inserted into the ground, the rod is moved to the horizontal direction (lateral direction) by raising and lowering the excavator while jetting a jet from the nozzles, and the trench with a certain width is excavated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trench excavation method for excavating a trench having a fixed width in the ground in order to construct a wall-like improvement body in the ground, and an apparatus used for the method.

[0002]

2. Description of the Related Art Conventionally, for example, when connecting two preceding panels provided in parallel in the ground in the vertical direction with a new panel, a groove for the new panel is excavated between the preceding panels and concrete is poured. Techniques for linking are known.

[0003] However, in the above-mentioned technology, there is a problem that if the earth and sand adhere to the edge portion of the preceding panel, the earth and sand serve as a water passage, and the joining between the new panel and the preceding panel is weakened.

Accordingly, the present applicant has disclosed in Japanese Patent Application Laid-Open No. Hei 7-26886.
No. 2 and Japanese Unexamined Patent Publication No. 7-292659, a technique of excavating a groove together with a concrete cutter up to the end of the preceding panel, or a method of constructing a waterproof wall is proposed. The effect can be improved by any of the techniques. However, in these techniques, there is a problem that the labor for trench excavation is great, the construction process of trench excavation is complicated, and a long construction period is required.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and the process for constructing a trench excavation work is simple, and the equipment required for the construction is simple. The purpose of the present invention is to provide a trench excavation method and an apparatus therefor.

[0006]

The trench excavation method of the present invention comprises:
It has a rod insertion step of inserting a rod having a plurality of jet digging means capable of digging a groove of a predetermined width into the ground, wherein the jet digging means is configured such that a jet nozzle rotates around the periphery thereof. A groove excavation step of rotating the jet nozzle while injecting a jet jet, and reciprocating the jet excavation means in a vertical direction to move the rod horizontally to excavate a groove of a predetermined width. Have.

Here, the jet nozzle may be configured to rotate only at the peripheral portion of the jet digging means, or may be configured to rotate around the center of the jet digging means. May be.

[0008] When the trench excavation method of the present invention is carried out,
Preferably, the rod insertion step is performed while excavating a boring hole in the ground into which the rod is to be inserted, using a boring hole excavating means provided on the rod. Alternatively, the rod insertion step preferably includes a boring hole excavating step of excavating a boring hole, and a step of inserting the rod into the boring hole.

Here, it is preferable that the boring hole excavating means is provided, for example, at the tip of a rod. Then, a rotary drilling bit in which a drilling tip is arranged may be used, or a type that injects a cutting fluid such as high-pressure water may be used. Further, the boring hole excavating means may be constituted by an auger, or a percussion type excavating machine may be used.

A groove excavator according to the present invention comprises a frame configured to be able to travel on the ground where a groove is to be excavated, a rod attached to the frame, a jet excavating means provided on the rod, A jet nozzle provided in the excavating means, a rotating means for causing the jet nozzle to rotate near the periphery of the jet excavating means, a reciprocating means for reciprocating the jet excavating means in a vertical direction, and the rod Lifting means for raising and lowering the frame in the vertical direction with respect to the frame.

Here, when drilling a boring hole using a rod provided with a jet drilling means, it is preferable to provide a drilling hole drilling means at the tip of the rod. The boring hole excavating means may be a rotary excavating bit having an excavating tip disposed at an end thereof, or a type for injecting a cutting fluid such as high-pressure water. Further, the boring hole excavating means may be constituted by an auger, and it is also possible to use a percussion type excavating equipment.

Further, the jet nozzle is installed at or near the peripheral edge of the jet digging means, and is configured to rotate around the peripheral edge of the jet digging means. However, the jet nozzle may be installed near the center of the jet digging means so as to rotate around the center of the jet digging means (or in the vicinity thereof).

That is, the arrangement of the jet nozzle is not limited as long as the ground in a range facing the jet excavating means is cut by the high-pressure jet (of the cutting fluid) injected from the jet nozzle. It does not do. In that sense, the jet direction of the high-pressure jet jetted from the jet nozzle is not limited at all, as long as the ground in the range facing the jet excavation means is cut, similarly to the arrangement of the jet nozzle. Absent.

In practicing the present invention, it is preferable that a guide frame for guiding the lifting and lowering of the rod is attached to the frame.

In addition, a pair of the jet nozzles is provided, and the jet jets jetted from the jet nozzles may form a so-called cross jet.

The reciprocating means reciprocates the jet excavating means in the vertical direction along the rod (ie, without moving the rod up and down,
The type in which the relative position of the jet digging means with respect to the rod may be changed), or the type in which the rod is reciprocated in the vertical direction without changing the relative position of the jet digging means with respect to the rod. It may be.

According to the present invention having the above-described structure, the jet nozzle rotates near the periphery of the jet excavating means while jetting the jet jet. At the same time, since the rod is moved in the horizontal direction while reciprocating the jet digging means in the vertical direction, the diameter is equal to the diameter of the digging trajectory (circumferential trajectory) by the jet jet ejected from the jet nozzle. A groove of a predetermined width will be excavated in the ground.

Here, if the horizontal movement distance of the rod and the frame is set to a distance equal to the length of the underground wall to be built, the groove necessary for the underground wall construction can be obtained by only one excavation work. Is excavated.

Therefore, a complicated construction procedure of excavating a short groove a plurality of times is not required, and construction for preventing water leakage at a connection point connecting short underground walls is also unnecessary. That is, according to the present invention, the labor of the construction work is far reduced as compared with the conventional construction of the underground wall.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a boring hole 2 is excavated to a predetermined depth in the ground G (boring hole excavating step), and a rod 9 is inserted into the boring hole 2 by a crane (not shown) on a guide 10 provided on the frame 1. It is guided and inserted (rod insertion step).

Here, a boring hole excavating means (not shown) may be provided at the tip of the rod 9 to simultaneously insert the rod and excavate the boring hole (boring hole excavating step).

Referring also to FIG. 2, the rod 9 is mounted to be able to move up and down via a rod 7a of an elevating cylinder 7 installed on a sub-frame 2 provided on the frame 1.

A plurality of (11 in the illustrated example) water jet devices (jet digging means) are provided on the rod 9 with an interval D therebetween.
11 is attached.

In FIG. 1, reference numeral 3 indicates wheels, and reference numeral 5
Indicates a wheel driving device.

Referring to FIGS. 3 and 4, the water jet device 11 includes a main body 15 fixed to the rod 9, a rotating disk 11 as a rotating means rotatably attached to the main body 15, And a plurality (two in the illustrated example) of nozzles 19 provided on the diameter of the disk 11.

Although not shown, the rotating disk 11
A plurality of wall finishing bits 17...

The nozzle 19 is a member for jetting high-pressure water as a jet jet. Water (high-pressure water) to be a jet jet, a muddy water pump 20 (FIG. 1: boring hole 2)
(Disposed at the bottom of the guide 10 or at the lower end of the guide 10) is supplied to the nozzle 19 via a high-pressure pump and a high-pressure hose (not shown). However, when the depth of the boring hole 2 is shallow, the muddy water pump 20 can be omitted.

Although a drive source for rotating the rotating disk 11 is not shown, a conventionally known technology such as a commercially available hydraulic motor, air motor, electric motor, or water jet turbine may be used.

Although not explicitly shown, the lifting cylinder 7 is configured to vertically move or reciprocate the rod 9 with an amplitude substantially equal to the interval D between the rotating disks 11 (see FIG. 2). It is combined with a fluid pressure device (not shown) such as a hydraulic device or an electric motor such as a motor.

The operation of the illustrated embodiment will be described below. First, a boring hole 2 having a depth equal to the depth dimension of an underground wall to be built in the ground and into which a rod 9 of a trench excavator can be inserted is excavated by a conventionally known method. (Borehole excavation process).

Next, the trench excavator shown in FIG. 1 is installed, and the rod 9 is inserted into the boring hole 2 so that the nozzle 19 of the water jet device 11 faces the direction to be excavated (the direction of arrow C in FIG. 1). -Set (rod insertion process).

As described above, a boring hole excavating means may be installed at the tip of the rod 9, and excavation of the boring hole and insertion of the rod may be performed simultaneously.

With the rod 9 set in the boring hole 2, a high-pressure pump (not shown) is operated to rotate the rotary disk 16 of the water jet device 11 to move the nozzle 19 on a circular locus while the high pressure is being applied. A water jet is sprayed, and ground excavation in a direction to be excavated (in a direction indicated by an arrow C in FIG. 1) for construction of an underground wall by the water jet J is started.

At the same time, a hydraulic device (not shown) is driven to move the rod 9 up and down (or reciprocate) by a distance H (FIG. 5). Here, the distance H shown in FIG. 5 is set to be equal to the distance D between the water jet devices 11 (see FIG. 2) or slightly longer than the distance D.

Referring to FIG. 5, each of the water jet devices 11 provided on the rod 9 has a pair of nozzles 1.
9 and 19 are provided, and high-pressure water jets J1 and J2 are jetted from the nozzles 19 and 19.

Then, a jet J1 of high-pressure water (drilling fluid),
While injecting J2, the rotating disk 16 rotates and moves up and down (reciprocating) by the amplitude H. The symbol K in FIG. 5 indicates the trajectory of the vertical movement of the rotating disk 16.

Here, due to the rotation of the rotating disk 16, the ground in an area facing the rotating disk 16 is moved by the high-pressure water jet J.
1, due to J2, cutting is ensured, and the uncut area does not remain. In addition, since the distance H (FIG. 5) is set to be equal to or greater than the distance D (see FIG. 2) between the water jet devices 11, an area in which excavation by the high-pressure water jets J1 and J2 is not performed also in the vertical direction. not exist.

Therefore, grooves having a width dimension W equal to the diameter dimension of the circumferential trajectory K and a required depth are excavated by the high-pressure water jets (cross jets) J1 and J2.

Here, as shown in FIG.
The jets J1 and J2 injected from 9A and 19A are configured to collide with each other to form a so-called “cross jet”.
If it is made to excavate the basin slightly outside of 6 with high precision, the final excavation on the side surface of the groove excavated by the illustrated embodiment will be performed by the cross jets J1 and J2, which is preferable. . This is because the cross jet can control the cutting distance by the jet with high accuracy.

4 and 5, the nozzle 19
Are provided near the periphery of the rotating disk 16.
On the other hand, as shown in FIG. 6, if at least one nozzle (a pair of nozzles 19A in FIG. 16) is provided on the periphery of the rotating disk 16, the other nozzles (19B in FIG. 5) are not provided. , May be provided near the center of the rotating disk 16.

In FIG. 6, reference numeral J3 denotes a jet of cutting fluid (for example, high-pressure water) jetted from a nozzle 19B provided near the center of the rotating disk 16.

Referring again to FIG. 1, while the rotating disk 16 of the water jet device 11 is rotating and jetting high-pressure water from the nozzle 19, the water jet device 11 is reciprocating up and down while the frame 1 is driven. If the frame 1 is horizontally moved by the device 5 in the direction of arrow C in FIG. 1, a groove having a predetermined depth and a predetermined width can be continuously excavated (groove excavation step).

Here, the muddy water stored in the excavated trench is used for the muddy water pump 2 (for use as a high-pressure water jet).
Since it is discharged from the inside of the boring hole 2 by 0, the resistance of the rod 9 in the lateral movement is reduced, and the construction can be performed with less driving force.

In the illustrated embodiment, if the width of the groove to be excavated is large, the water jet device 11 is arranged in parallel with the rod 9, that is, the arrow H in FIG.
A plurality may be provided in the direction.

Further, in the case of trench excavation for the purpose of connecting panels constructed in advance, the above-mentioned various excavating means do not use a type provided with a bit, but use a high-pressure water jet. A drilling type may be used.
This is because, if the excavation is performed only by the high-pressure water jet, the mud at the edge of the preceding panel can be dropped by the high-pressure water jet.

In the above embodiment, the water jet device 11 is fixed to the rod 9 and the rod 9 itself is moved up and down.
May swing vertically, and the high-pressure water jet may be ejected in a vertical fan-shape (due to the vertical swing).

When a deep trench is excavated, the rod itself becomes large, so it is necessary to fix the rod to the frame and reciprocate vertically. However, if the water jet device 11 is configured to swing vertically, there is an advantage that it is not necessary to fix a large rod to the frame and reciprocate up and down.

In addition to this, if a work vehicle configured to equip the work vehicle with the above-described sub-frame is used instead of the frame, it is convenient and free to move.

The illustrated embodiment is merely an example,
It is not a statement to the effect of reducing the technical scope of the present invention.

For example, in the illustrated embodiment, a high-pressure water jet is used as a jet jet, and a water jet device 11 is shown as a jet digging means. However, in the present invention, a fluid other than water is used. Excavation using a jet jet is also included.

In the illustrated embodiment, the excavating means (water jet device 11) does not change its relative position with respect to the rod. However, the excavating means may be configured to reciprocate along the rod. It is possible.

Further, as described in the illustrated embodiment, a boring hole excavating means may be provided at the tip of the rod 11 so that excavation of the boring hole and insertion of the rod 11 may be performed simultaneously.

[0053]

The present invention has the following excellent functions and effects. (1) Since a plurality of water jet nozzles provided on the rod are rotated and the rod is laterally moved to excavate the groove, the groove width and the depth can be freely set. (2) Since the water is jetted using the muddy water during excavation, the moving power of the rod is reduced, and energy can be saved. (3) When excavating a groove between the preceding panels, it is possible to excavate the groove so that mud does not adhere to the edge of the preceding panel. (4) Excavation means corresponding to the size of the groove can be provided, which can contribute to cost reduction.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire configuration of a trench excavation apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a side view showing the water jet device of FIG. 1;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a diagram showing a trench excavation mode using a high-pressure water jet.

FIG. 6 is a diagram showing another mode of trench excavation using a high-pressure water jet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frame 2 ... Sub-frame 3 ... Wheel 5 ... Drive device 7 ... Elevating cylinder 9 ... Rod 10 ... Guide 11 ... Water jet device 15 ... Body 19, 19A, 19B ... Nozzle J, J1, J2, J3 ... Water jet

Claims (3)

[Claims] 1. A rod insertion step of inserting a rod having a plurality of jet digging means capable of digging a groove of a predetermined width into the ground, wherein the jet digging means rotates a jet nozzle around a peripheral portion thereof. It is configured to
A groove excavation step of rotating the jet nozzle while ejecting a jet jet and reciprocating the jet excavation means in the vertical direction to move the rod horizontally to excavate a groove of a predetermined width. A featured trench excavation method. 2. A frame configured to be able to travel on the ground where a groove is to be excavated, a rod attached to the frame, a jet excavating means provided on the rod, and a jet excavating means provided on the jet excavating means. A jet nozzle, rotating means for causing the jet nozzle to rotate near the periphery of the jet digging means, reciprocating means for causing the jet digging means to reciprocate up and down, and the rod with respect to the frame. A ditch excavating device for raising and lowering in a vertical direction. 3. The trench excavator according to claim 2, wherein a guide frame for guiding the lifting and lowering of the rod is attached to the frame.