JPH0372194A - Hole excavation method and jig for excavation - Google Patents

Abstract

PURPOSE:To make the excavation easier by forming a hole in a tube form with the length longer than ring frames, and with the inner diameter of the size to allow the insertion by coinciding the axes of the ring frames, and providing blades and holder parts for jacks. CONSTITUTION:A hole 12 of a reverse conical trapezoid form is excavated, a concrete is placed horizontally to provide a standard surface 14, and a jig 10 for excavation is loaded vetrical thereon. Then, on a holding part 10b, four jacks 18 are loaded in the same intervals, ring frame 20a, 20b, 20c, and 20d are loaded along the inner circumferential surface of the jig 10, and connected each other. Then, a concrete 17 is placed around the jig 10 and kept vertical to form a starting hole. And the jacks 18 is pushed to depress the jig 10, the bottom surface is excavated to lower a segment 26 and contact it to the lower side of the ring frame 20a to coincide the connecting parts 28, and a ring frame 20e is composed. Consequently, the excavation can be carried out easily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for excavating a hole such as a water collection well and a jig for excavation.

(Conventional technology) Heavy rains and long rains cause a lot of groundwater to flow underground.
A phenomenon called a landslide occurs when the strata above the sliding surface of a slope slides down.

There have been several methods of removing groundwater in order to prevent landslides or to suppress landslides after they occur. These methods include horizontal polling and water collection well methods.

Among these, water collection wells are a permanent measure to collect groundwater and lower the groundwater level.

Here, two methods known as conventional construction methods for excavating a hole as a water collection well will be explained.

First, the first construction method is to use ring-shaped concrete.
This is a top-jointing method in which blocks made from 1 to 1 are pressed down into the ground by applying weight from above, and blocks are added one after the other on top.

As shown in FIG. 11, this top-jointing method involves passing reinforcing bars 1 vertically and assembling concrete blocks 2 with mortar sandwiched between joints 3. In addition, to add weight, a heavy object was placed on top and pushed into the ground.

In addition, as a second construction method, as shown in FIG. This prevents the inner peripheral surface from collapsing.

In this second construction method, a hole is dug below the 1-I steel ring 5a located at the lower end where earth pressure is applied (referred to as over-drilling), and the plate 6 and Hwi
Then, the ring 5b is constructed.

In the same manner, additional drilling is performed and the plate 6 and HwI ring 5 are added to the bottom. In this case, the inner peripheral surface 7a of the hole 7
This results in extra digging of the space #, 8 formed between the plate 6 and the plate 6.

(Problems to be Solved by the Invention) In the first construction method described above, as the depth increases, the earth pressure applied to the circumferential surface of the concrete blocks that form the water collection well increases, and the water collection well formed by connecting the blocks increases. It becomes impossible to scuttle. Furthermore, it is difficult to make the distance 1 south of the joint 3 constant, and therefore the depth cannot be measured based on the number of blocks. Furthermore, if the ground is soft, blocks below the ground may be suspended, and in some cases, the blocks may fall.

On the other hand, in the second construction method, the over-excavated wall surface collapses during over-excavating, which is dangerous. Especially in sandy areas,
Boiling, where sand and water flow out all at once, can occur during over-drilling, putting human life at risk. In addition, in clayey strata, the inner wall of the hole may collapse, which is called heaving.

For this reason, over-drilling work is difficult.

In addition, since the hole 7 is reinforced using the H steel ring 5,
A gap 8 is formed between the inner circumferential surface 7a of the hole 7 and the plate 6, and it is not necessary to excavate extra dirt or the like in this gap 8.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for constructing holes that is easy to construct, and a suitable excavation jig for use in constructing holes.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes the following configuration.

In other words, jigs for drilling water collection wells, etc.

A drilling jig for drilling a hole whose inner wall is covered with a multi-stage ring frame, the length is longer than the length of the ring frame, and the ring frame has an inner diameter large enough to be fitted with the axes aligned. In addition, as a method for constructing a hole, the hole is formed into a cylindrical shape, and a cutting blade for digging is formed at the tip, and a receiving part for jacking is provided protruding from the inner wall surface on the tip side.

(a) A step of digging a shallow hole for a starting port; b. A step of arranging the blade of the excavation jig according to claim 1 in this injection so as to face the bottom of the injection. , placing the first ring frame by partially or entirely fitting it into the excavation jig;
A retracted jack is arranged between the first ring frame end face and the receiving part of the excavation jig, and one or more ring frames are connected to the other end face of the first ring frame as necessary. and d. digging into the bottom of the injection hole and extending the jack to advance the excavation jig.

e. With the front end of the first ring frame fitted into the excavation jig, stop the forward movement of the excavation jig, take out the jack, and cut the next second ring frame into multiple pieces. a step of introducing the divided ring frame into an excavation jig, joining the ring pieces to form a second ring frame, and connecting the second ring frame to the first ring frame; , Place the retracted jack between the second ring frame and the receiving part of the excavation jig, and repeat steps d and e above to excavate the hole and create the required number of ring pieces after the third ring piece. and a step of connecting the ring pieces.

(effect) Next, one effect will be described.

Dig the injection hole for the a0 launch port.

b. Place the cutting jig blade in this injection facing toward the bottom of the injection.

c. Partially or completely inserted into the excavation jig and the first
a ring frame is arranged, a jack in a retracted state is arranged between the end face of the first ring frame and the receiving part of the excavation jig, and the first ring frame is arranged.
Connect one or more ring frames as necessary to the other end surface of the ring frame, and immovably fix the first ring frame side to an external member 6d, while digging the bottom of the injection hole, The jack is extended to move the excavation jig forward.

e. With the front end of the first ring frame fitted into the excavation jig, stop the forward movement of the excavation jig, take out the jack, and cut the next second ring frame into multiple pieces. The divided ring frame is introduced into an excavation jig, the ring pieces are spliced together to form a second ring frame, and the second ring frame is connected to the second ring frame.

f. Place the retracted jack between the second ring frame and the receiving part of the drilling jig, and repeat the steps d and e above to excavate the hole and remove the necessary holes after the third ring piece. Connect several ring pieces.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The present invention relates to a method for drilling a hole and a jig for drilling. Here, the method for drilling a hole will be explained step by step using a water collection well as an example.

First, the excavation jig used in the method of excavating a water collection well will be explained. FIG. 1 shows an excavation jig 10. As shown in FIG. FIG. 1(a) shows a longitudinal sectional view, and FIG. 1(b) shows a plan view.

This excavation jig 10 has a cylindrical shape, and has a single-sagittal blade 10a projecting toward the center at its tip. At the rear end of this blade king Oa, a horizontal plunge-shaped receiving portion 10b that projects centrally is formed.

The method of excavating a water collection well will be explained.

First, construction of a starting point for starting digging of a water collection well will be explained with reference to Fig. 2. FIG. 2 is an explanatory cross-sectional view showing the construction state.

A carpenter 2 in the shape of an inverted truncated cone is dug on the ground surface where a water collection well is to be constructed. Concrete is poured horizontally into the bottom of this hole 12 in a donut shape to form a base addition surface 14.

The excavation jig 10 is vertically placed on this J, 119 surface 14.
Place.

A jack 18 is placed on the receiving part 10b of the excavation jig 10.
Place four of them at equal intervals (only three are shown in Figure 2).

Note that the jack 18 is arranged in a retracted state.

A ring frame 20a formed into a cylindrical shape by connecting a plurality of segments is disposed on the jack 18 along the inner peripheral surface of the excavation jig 10. Following this ring frame 20a, a ring frame 20b, 20 cm, is made by sequentially combining segments.
20d and connect.

Then, concrete 17 is poured around the blade 10a of the excavation jig 10 to hold the excavation jig 10 straight.

Next, in order to fill the hole ↓2 and hold the ring frame 20 vertically, soil 22 is poured onto the concrete 17 and tamped.

Next, the reinforcing bars 9 are made to protrude horizontally from the inner wall surface of the ring frame 20b, and the fixed concrete 2 is placed on the soil 22.
4 to integrate it with the reinforcing bar work 9 and fix the ring frame 20b.

Further, soil is poured onto the fixed concrete 24, and concrete 25 for scaffolding is placed around the uppermost ring frame 20d.

The construction of the starting gate is completed in the above manner.

Here, with reference to FIG. 3, the shape of the segments forming the ring frame 20 and the connection method will be explained.

26 is a segment. The segments 26 are formed into a ring shape by combining a plurality of segments, and each segment 26 is a member formed into a thick arc shape.

The segment 26 has a notch 2 for connection on the inner edge of the peripheral edge.
6a is formed. Connection surface 26 of this notch 26a
A connecting plate 27 having a hole 27a is integrally provided on the c side. There are three connecting parts 28 each consisting of the notch 26a and the connecting plate 27 on the upper edge and the lower edge.
Two pieces are provided on each side edge.

When connecting, the connecting portions 28 of adjacent segments 26
Align the holes 27a and insert the bolt 29a into the nut I.
Fix by b.

The ring frame 20 described above is formed by connecting the segments 26.

Next, the procedure for drilling a water collection well will be explained.

(2) The ring frames 20a to 20d shown in FIG. 2 are connected in the vertical direction by bolts 29a and nuts 29b via connecting portions 28. Further, since the position of the ring frame 20b is fixed by the fixed concrete 24, the four ring frames 20a to 20d are in a fixed state.

In this state, if you extend the four jacks 18 at the same time,
The jack 18 pushes the receiving part 10b of the excavation jig 10 to push down the excavation jig 10.

As the excavation jig 10 descends, or prior to its descent, the bottom of the hole 12 is dug.

(2) Then, the distance α between the ring frame 20a and the receiving portion 10b of the excavation jig 10 is pushed down until it becomes the sum of the height of the segment 26 and the shortened length of the jack 18.

■ Sequentially lower the segments 26 into the holes.

This segment 26 is made by screwing a hanging fitting 30 into the screw hole 26b (see Fig. 3) at the center of the segment 26, suspending it with a wire 32, and lowering it (see Fig. 4). between the ring frame 20a of the ring frame 20a and the receiving part 10b of the excavation jig 10 (see FIG. 5(a)), and connect the upper surface of the segment 26 to the existing ring frame 2.
0a and align the connecting portions 28 (FIG. 5(b)), then connect the pole l-29a and the nut 29b.
Fix it by.

Further, the segments 26 connected under the ring frame 20a are sequentially connected to circumferentially adjacent segments 26 to form the ring frame 20e.

At this time, remove the upper jack 8 one after another and remove the ring frame 20e.
It is arranged in a retracted state between the lower surface of the excavation jig 10 and the receiving part 10b of the excavation jig 10.

(2) In the same manner, the jack 18 is extended to sequentially form ring frames 20f, 20g, etc., and the water collection well is dug deeply.

■ A water collection well 50 is formed by descending to a predetermined depth.

In this water collection well 50, concrete 52 is poured onto the bottom surface of the water collection well 50 using the excavation jig 10 as a formwork (see FIG. 6).

This is to prevent water from penetrating deeper from the bottom surface when collecting water in the water collection well 50 and discharging it.

(2) Next, a plurality of water collection holes 54 are radially polled on the side wall surface of the water collection well 50, and the polls extend across the slope surface.

Further, the drainage hole 56 is polled below the water collection hole 54.

The water collected from the water collection hole 54 is once collected in the water collection well 50 and then discharged from the drainage hole 56 to a stream 58 outside the slope, thereby draining the slope where landslides are likely to occur or have occurred. .

In the above embodiment, the case where the excavation jig 10 is lowered into the soil when digging the bottom of the hole 12 will be explained with reference to FIGS. 8 to 10.

By digging the bottom of the water collection well hole 12, if there are viscous or gravel protrusions on the inner circumferential surface, remove the jack 18.
can be easily removed by the descending force of
(see figure).

Further, if a boulder exists in front of the blade 10a of the excavation jig 10, the boulder is crushed with a breaker or the like and lowered (see FIG. 8).

In addition, if there is a stone at the tip of the blade 10a of the excavation jig 10, since the blade 10a is formed in a single arrow shape on the inside,
Sometimes the stones are moved inward to facilitate excavation (see Figure 9).

Furthermore, if the foundation is clay or sandy soil, excavation jig I
As the O blade 10a descends, the earth and sand are scraped inward and moved, making it easier to excavate (see Fig. 10).

In addition, although the above-mentioned example explained the case where a water collection well is dug down, it can also be applied to the case where a side hole is excavated. The point is that the excavation jig can be moved forward and the segments for preventing the inner peripheral surface of the hole from collapsing can be assembled inside the jig.

Although various explanations have been given above with reference to preferred embodiments of the present invention, it goes without saying that the present invention is not limited to the above-mentioned embodiments. It goes without saying that many modifications can be made without departing from the spirit of the invention, such as by molding it accordingly.

(Effects of the Invention) Since the present invention is configured as described above, it achieves the following remarkable effects.

1) This excavation method, in which the excavation jig is pushed down using a jack, does not require over-drilling, so earth and sand will not collapse into the hole.

Further, since the operator can work within the excavation jig, sufficient safety can be ensured.

2) Each ring frame, which is sequentially connected to the bottom end to form a water collection well, can be done inside the excavation jig, so it will not shift due to earth pressure, etc., and the strength will be increased. Because of its excellent properties, there is no risk of the hole being crushed by earth pressure.

3) Even in areas with a lot of groundwater or in areas with fluid soil such as sandy ground where the water level is high and there is a risk of boiling, the ring frame can be added within the excavation jig, making it safe and easy to use. Due to its structure, work efficiency is good. Also,
Even if the surrounding soil is high, the excavation jig can be used to dig deep.

4) After digging the water collection well, the bottom surface of the water collection well can be formed using the excavation jig located at the bottom of the water collection well as a formwork, so that concrete pouring can be easily performed.

5) Since the excavation jig has a blade at its tip and a receiving part on its inner peripheral surface, it can be easily lowered into the soil by using a jack.

[Brief explanation of drawings]

Figures 1 (a) and (b) are a vertical sectional view and a plan view of the excavation jig of the present invention, Figure 2 is a cross-sectional explanatory diagram showing the construction state of the starting mouth of a water collection well, and Figure 3 is a segment diagram. FIG. 4 is a perspective view showing the connected state; FIG. 4 is a front view showing the segment suspended;
Figures 5 (a) and (b) are explanatory diagrams showing the state in which the segments are assembled, Figure 6 is a partial sectional view of the water collection well, and Figures 7 to 10 are explanatory diagrams showing the state of excavation with the excavation jig. , 1st
1 and 12 are a perspective explanatory view and a cross-sectional explanatory view showing a conventional example. lO...Drilling jig, 10a...Blade, 10b...Receptacle, 12...Hole. 18... Jacket, 20... Ring frame, 26... Segment, 50... Water collection well.

Claims (1)

[Claims] 1. An excavation jig for drilling a hole whose inner wall is covered with a multi-stage ring frame, the length of which is longer than the length of the ring frame, and the ring frames have axes aligned with each other. An excavator for excavation characterized by being formed into a cylindrical shape with an inner diameter large enough to be inserted, having an excavation blade formed at the tip, and a receiving part for a jack protruding from the inner wall surface on the tip side. jig. 2. a. A step of digging a shallow hole for a starting point; b. A step of arranging the blade of the excavation jig according to claim 1 in the shallow hole so as to face the bottom of the shallow hole; c. For excavation. The first part is inserted partially or completely into the jig.
a ring frame is arranged, a jack in a retracted state is arranged between the end face of the first ring frame and the receiving part of the excavation jig, and the first ring frame is arranged.
Connecting one or more ring frames as necessary to the other end surface of the ring frame, and fixing the first ring frame side to an external member; d. Digging the bottom of the shallow hole; a step of extending the jack and advancing the excavation jig; e. stopping the advance of the excavation jig with the front end of the first ring frame fitted into the excavation jig, and moving the jack; Then, the next second ring frame, which is divided into a plurality of pieces, is introduced into the excavation jig, and the ring pieces are joined to form a second ring frame, and the second ring frame is divided into a plurality of pieces. Step 2 of connecting the ring frame to the first ring frame; f. Placing a retracted jack between the second ring frame and the receiving part of the excavation jig; and performing steps d and e above. A method for drilling a hole, comprising the steps of repeatedly drilling a hole and connecting a required number of ring pieces after a third ring piece.