JPS62202117A - Formation work of cement mortar pile in ground with wooden pile - Google Patents

Abstract

PURPOSE:To concurrently perform the removal of a wooden pile and the formation of cement-mortar pile by a method in which a casing with an existing wooden pile is pulled up from ground and cement mortar is poured from an injecting tube attached to the casing into the ground. CONSTITUTION:A casing 1 is turned, excavating water is jetted from a nozzle 2, and the casing 1 is penetrated to above an existing wooden pile 10a. The turning of the casing 1 with the pile 10a and the supply of excavating water are stopped, and while supplying cement mortar through an injecting tube 6, the casing 1 is pulled up to the ground's surface. The removal of the existing wooden pile 10 and the formation of the cement mortar pile can thus be performed concurrently.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a method of constructing mortar piles after removing existing wooden piles driven into the ground.

[Prior Art] Many wooden piles, such as pine, are driven into the ground of existing old buildings as foundation piles. When demolishing an old building and constructing a much newer one, the wooden piles must be removed in order to carry out the foundation work.

Traditionally, wooden piles were mainly removed using casings.

This casing method involves driving a steel casing with a diameter sufficient to completely enclose the wooden pile around the wooden pile using a vibro hammer, cutting the edge between the ground and the wooden pile, and In the case of inserting a wooden pile into the casing and pulling out the wooden pile enclosed with the casing, as shown in v11 of Japanese Patent Publication No. 53-40244, an auger with screws installed on the outer periphery and inside the tip is rotated. In some cases, 11 people have to get into the ground around the wooden pile and use an auger to take the wooden pile and pull it out.

[Problem to be solved by the invention 1 In the ground where wooden piles have been driven in this way, it is necessary to pull out the wooden piles and backfill them before constructing piles for mountain soil necessary for foundation work in the ground. In addition, the piles are not always driven vertically, and depending on the ground, the wooden piles may tilt over time, making it extremely difficult to pull them out using sinking or augers. There are cases where For this reason, developing the ground on which wooden piles were driven was time consuming and costly, and sometimes caused delays in foundation work.

[Means for Solving the Problems] This invention was conceived in view of the above circumstances, and its purpose is to eliminate the need to pull out and backfill wooden piles in advance, and to eliminate the need for mortar piles. We have developed an extremely streamlined mortar pile construction method that can remove wooden piles that are an obstacle to ground development during land preparation, and also allows the removal of main piles and the creation of mortar piles to be carried out continuously using a single casing. It is about providing.

This invention according to the above object has an excavated waterway in the peripheral wall,
Using a casing equipped with screws on the outside and inside of the tip, a nozzle and a cutter for digging and cutting at the tip, and a mortar injection pipe along the inside wall, drilling water is poured while rotating the casing. At the same time, the cutter cuts the wooden piles in the ground vertically and takes the wooden piles into the casing together with the excavated soil. After excavation, the rotation and injection are stopped to enclose the cut wooden piles. The gist of this method is to create piles by injecting mortar into the excavated hole while pulling up the casing.

[Function] In the above construction method, if there is a wooden pile in the direction of excavation of the casing,
The wooden stake is cut vertically with a cutter at the portion where it touches the periphery of the tip of the casing.

In addition, the cut wooden piles are taken into the inside of the casing together with the excavated material by the screw inside the casing, and even if there are wooden piles in the ground, the excavation continues without being hindered. Removal of this material and creation of mortar piles will be carried out at the same time.

The present invention will be explained in more detail below with reference to illustrated embodiments.

[Example] Fig. 1 shows a casing 1 used in the present invention, and the casing 1 has a peripheral wall composed of an inner wall u1a and an outer wall 1b, and between these double walls is a casing tip end. Excavation channels 3 connected to the nozzle 2 are provided at multiple locations.

Also, on the outside of the casing 1, there is a screw 4 for drilling.
A screw 5 for taking in is provided inside the tip, and a mortar injection pipe 6 is provided inside the casing up to the tip of the casing where a cutter 7 for excavation and cutting is provided in contact with the inner wall.

FIG. 2 and subsequent figures show the construction method of the present invention using the casing 1 in the order of steps. First, as shown in FIG. 2, the casing 1 is set on the ground 11 where the wooden piles 10 have been driven. Next, the casing 1 is rotated in the same manner as in the case of an auger screw, and the ground 11 is excavated while the excavation water supplied to the casing 1 is injected from the tip.

When the tip of the casing comes into contact with the wooden pile 10 in the ground due to this excavation, the cutter 7 at the tip cuts the wooden pile 10 vertically, regardless of the driving state of the wooden pile 10, and the cut wooden pile 10a It is taken vertically into the casing by the screw 5, and the excavation continues as it is.

As shown in FIG. 3, once the ground 111 has been excavated to the bottom of the wooden pile 10, the rotation and the supply of excavation water are stopped, and the casing is removed with the excavated soil 11a and the cut wooden pile 10a contained therein. 1 will be raised.

Further, as the casing 1 is pulled up, as shown in FIG. 4, mortar 13 is injected into the excavated hole 12 formed in the ground 11. As shown in FIG. After removing a portion of the mortar pile 14, it remains.

If this mortar pile 14 is to be constructed on mountain soil, the casing 1 is further set on the ground sii next to the mortar pit 14, and the wooden pile 10 is removed and the mortar is removed in the same process as above. 13 is poured, and the next mortar pile 14a is placed adjacent to the mortar pile 14. As a result, the wooden piles 10 are replaced with mortar piles 14, and a mortar pile row is constructed there.

In addition, if the purpose is to stabilize soft ground,
The mortar piles 14 are constructed at regular intervals, and the wooden piles 10 between them are removed by known means.

[Effects of the Invention] As described above, this invention excavates the ground and cuts wooden piles in the ground by rotating a casing equipped with a cutter for excavation and cutting at the tip and injecting excavation water from the tip. At the same time, the cut wooden piles are taken into the casing together with the excavated soil and removed by pulling up, and the mortar piles are also created. There is no need to return the wooden pile, and since the wooden pile is cut vertically, even if the wooden pile is located at an angle, it can be removed reliably regardless of its condition.

In addition, since the cut wooden piles are taken in vertically by an internal screw, there is no large resistance when the wooden piles are taken in, and the cut piles can be easily discharged together with the excavated soil after being pulled up. Therefore, the ground with wooden piles can be developed more quickly than before, and the period required for foundation work is also shortened.

[Brief explanation of drawings]

The drawings schematically show the mortar pile construction method according to the present invention, with FIG. 1 being a half longitudinal sectional front view of a casing, and FIGS. 2 to 6 being sectional views showing the construction steps in order. 1... Casing 2... Nozzle 3... Excavation channel 4.5... Screw 6... Mortar injection pipe 7... Cutter 10... Wood Pile
10a...Cut wooden pile 11...Ground 11a...Drilled soil 12...Drilled hole
13... Mortar 14... Mortar pile Patent applicant Tokki Kogyo Co., Ltd. Figure 2 Figure 4 Figure 6

Claims (1)

[Claims] Using a casing that has an excavation channel in the peripheral wall, a screw on the outside and the inside of the tip, a nozzle and a cutter for digging and cutting at the tip, and a mortar injection pipe along the inside wall, Excavating the ground by injecting excavation water while rotating the casing, cutting the wooden piles in the ground vertically with the cutter, taking the wooden piles together with the excavated soil into the casing, and rotating and injecting water after excavation. A method for constructing mortar piles in the ground having wooden piles, characterized in that the piles are constructed by injecting mortar into an excavated hole while stopping the casing containing the cut wooden piles and pulling up the casing containing the cut wooden piles.