Method and equipment for treating raised portions of ground improvement bodies

Abstract

To provide a treatment method and a treatment device of a rising portion of a ground improvement body capable of easily and efficiently performing a removal work of the rising portion of the ground improvement body.SOLUTION: Provided is a treatment method which removes a rising portion 7 after supplying granulated treatment materials comprising water-absorbing polymer materials, or humic acid used for saccharide such as sugar and starch decreasing a hydration reaction or polymer organic material-based coagulation retardant together with compressed air into an optional depth of the rising portion 7 to vertically separate or lower the strength of the rising portion 7. Also provided is a treatment device 8 for performing the treatment method.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method and device for treating a raised portion formed at the top of a ground improvement body made of soil cement or the like in construction work such as ground improvement. [Background technology]

[0002] Conventionally, a method has been proposed for treating a raised portion formed at the head of a ground improvement body, the method including the steps of attaching an excavation and stirring device to a base machine, rotating the excavation and stirring device in the ground to excavate and stir the ground to a predetermined depth, and forming a ground improvement body made of soil cement up to the predetermined depth, pulling the excavation and stirring device up to the ground, removing the excavation and stirring device from the base machine, and attaching a pile head treatment device having a shaft body and a plurality of cutting blades extending radially from the bottom of the shaft body to the base machine, and rotating the pile head treatment device in the ground, cutting off the excess portion of the unhardened soil cement that has been formed at a raised portion at the head of the ground improvement body greater than a specified depth with the plurality of cutting blades, and removing the excess portion.

[0003] In addition, as a treatment device for the raised portion of a ground improvement body, a pile head treatment device has been proposed that is formed to be replaceable with an excavation and mixing device that receives a driving force from a base machine, rotates in the ground, and forms a columnar ground improvement body made of soil cement in the ground, the pile head treatment device being attached to the base machine and having a shaft body that rotates in the ground, and at the bottom of the shaft body, a plurality of cutting blades are provided extending in the radial direction of the shaft body for cutting off the excess portion made of unhardened soil cement that is formed at a height higher than a specified depth at the head of the ground improvement body (Patent Document 1).

[0004] Furthermore, a method has been proposed in which cement-improved soil is granulated with a granulation treatment agent containing either a water-absorbent polymeric substance or quicklime, or both, to produce granulated treated soil, and the raised portion at the top of the cement-improved soil is then granulated (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-108886 A [Patent Document 2] JP 2018-168628 A Summary of the Invention [Problem to be solved by the invention]

[0006] The method and equipment for processing the raised parts of ground improvement bodies described in Patent Document 1 does not require the use of a backhoe to chop off the heads, making the work safer and producing high-quality ground improvement bodies.

[0007] Furthermore, according to the granulation method described in Patent Document 2, it is possible to easily chip or scrape off the top of the cement-improved soil by granulation without using any chemicals such as retarders, whether immediately after the soil has been created or several months have passed.

[0008] The present invention provides a method for treating a raised portion of a ground improvement body, which is intended to facilitate the removal of the raised portion of the ground improvement body and to improve the efficiency of the removal of the raised portion. Law The purpose is to provide. [Means for solving the problem]

[0009] The method for treating the raised portion of the ground improvement body of the present invention comprises the steps of: After completing the construction of the ground improvement body to the planned height, excavate the raised part to the desired depth. The excavation section Water Sugars such as sugar and starch that reduce hydration reactions and humic acid, which is used in polymeric organic coagulation retarders, With compressed air supply The ground improvement body and the raised part were separated into upper and lower parts. Then, the raised portion is removed (claim 1).

[0011] In the present invention,When compressed air is supplied to a desired depth of the raised part together with sugars such as sugar and starch that reduce the hydration reaction, or humic acid used in polymer-based setting retarders, the hydration reaction is reduced in the part to which compressed air and sugars such as sugar and starch that reduce the hydration reaction, or humic acid used in polymer-based organic setting retarders are supplied, and the raised part is separated into upper and lower parts or reduced in strength. Then, the raised part is removed.

[0012] In addition, compressed air is pumped to the bottom of the raised part, i.e., the top of the ground improvement body. The hydration The connection between the ground improvement body and the raised area can be severed by supplying sugars such as sugar and starch, which reduce the reaction, or humic acid, which is used in polymeric organic setting retarders.

[0013] Since the raised portion at any depth is separated into upper and lower portions or has a reduced strength, the subsequent removal of the raised portion can be easily and efficiently performed. Note that the raised portion at any depth is set to a plurality of locations depending on the size of the raised portion, etc.

[0014] The excavation of the raised part to a desired depth and the supply of sugars such as sugar and starch, which reduce the hydration reaction, and amino acids used in polymeric organic setting retarders and compressed air to the excavated part are The machine is made up of a hollow head having a bottom part formed with a drilling blade for the raised part of the ground improvement body around the lower end, and a granulation treatment agent made of a water-absorbent polymeric substance or sugars such as sugar and starch that reduce the hydration reaction, or humic acid used in polymeric organic coagulation retarders, and a compressed air outlet, and a connection part for connecting with the drilling rod of the base machine is formed at the upper end. A treatment device for the raised part of the ground improvement body is used.

[0015] The above The treatment device for the raised portion of the ground improvement body is used after the construction of the ground improvement body to the planned height is completed. One mode of use is as follows.

[0016] First, the drilling head used to construct the ground improvement body is removed from the drilling rod of the base machine, and the connecting portion formed at the upper end of the hollow head of the present invention is connected to the lower end of the drilling rod of the base machine.

[0017] Next, the base machine rotates the drilling rod and the hollow head to excavate the raised portion to a desired depth with the hollow head. When the raised portion is large, the desired depth may be set to a plurality of locations.

[0018] When drilling to the desired depth is completed, the drilling rod of the base machine is The above The hollow head is temporarily removed. Then, a predetermined amount of liquid is poured into the upper opening of the hollow head. The hydration Sugars such as sugar and starch that reduce the reaction and humic acid used in polymer organic coagulation retarders (hereinafter simply referred to as " Sugars and humic acids etc.") is poured into the hollow part of the hollow head.

[0019] Next, the hollow head containing the hydration reaction inhibitor etc. is connected to the lower end of the drilling rod of the base machine.

[0020] Next, the drilling rod and the hollow head are rotated by the base machine, and compressed air is supplied into the hollow head using the compressor and the drilling rod. As a result, the compressed air is blown out from the nozzle formed at the lower end of the hollow head. Sugars and humic acids etc. are injected into the raised part at any depth together with the compressed air, Sugars and humic acids The above materials are mixed together to separate the raised portion into upper and lower portions or to strengthen the raised portion.

[0021] In addition, The above The treatment device for the raised portion of the ground improvement body may be provided with multiple stages of stirring blades above the excavation blades of the raised portion of the ground improvement body, which are installed around the lower end, depending on the treatment thickness.

[0022] Furthermore, the present invention can be applied not only to the cutting of raised portions, but also to the supply of small amounts of liquid or powder into the ground, which are difficult to pump through a grout hose or to measure the flow rate. Effect of the Invention

[0023] According to the present invention, the raised portion is separated into upper and lower portions or has its strength reduced prior to the removal of the raised portion, so that the subsequent removal of the raised portion can be carried out easily and efficiently. [Brief description of the drawings]

[0024] [Figure 1] This is a process diagram showing a method for treating the raised portion of a ground improvement body. [Diagram 2] A partial cross-sectional view of a treatment device for the raised portion of a ground improvement body. [Diagram 3] FIG. 4 is an explanatory diagram showing an example of compressed air supply. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0026] 1(a) to (g) show the processing method of the present invention. Law In the figure, 1 is a freely movable base machine, a leader 2 is erected, and a drilling rod 3 having a flow path for a solidification material liquid is supported in an erect manner so as to be freely rotatable in parallel with the leader 2. In the figure, 4 is a drive part of the drilling rod 3, and 5 is a drilling head.

[0027] The ground improvement body made of soil cement improved soil is constructed by excavation by supplying solidification material to the excavation head 5 through the excavation rod 3. In Fig. 1, 6 is the ground improvement body constructed to the planned height, and 7 is the raised part formed at the head of the ground improvement body 6.

[0028] An embodiment of a method for treating the raised portion 7 will be described below.

[0029] While rotating the drilling rod 3, the drilling head 5 excavates to a specified depth, and the drilling rod 3 and the drilling head 5 are raised to construct a ground improvement body 6 of the planned height. At the same time, a raised portion 7 is formed at the head of the ground improvement body 6 (Fig. 1(a)).

[0030] Next, the drilling head 5 is removed from the drilling rod 3, As will be explained later A hollow head 8 is connected to the lower end of the drilling rod 3 (FIG. 1(b)).

[0031] Next, the drilling rod 3 is rotated to excavate the mound 7 with the hollow head 8 to the top of the ground improvement body 6 constructed to the planned height, i.e., to the bottom of the mound 7 (FIG. 1(c)). Of course, drilling may be performed multiple times depending on the size of the mound.

[0032] Next, when the excavation is completed, the hollow head 8 is temporarily separated from the lower end of the excavation rod 3 of the base machine 1 (FIG. 1(d)). Then, a predetermined amount of the hollow head 8 is inserted into the hollow head 8 through the upper end opening. Sugars and humic acids Then, add 9 to the total (Figure 1(e)).

[0033] Next, Sugars and humic acids The hollow head 8 into which the burrs 9 are inserted is connected to the lower end of the drilling rod 3 of the base machine 1 (FIG. 1(f)). Next, while the drilling rod 3 and the hollow head 8 are rotated by the base machine 1, compressed air is supplied to the hollow head 8 via the drilling rod 3 to blow the burrs 9 into the hollow head 8. Sugars and humic acids The liquid 9 is sprayed from a spray nozzle 11 opened horizontally at the bottom end of the hollow head 8. The liquid 9 is sprayed together with compressed air to any depth in the raised portion 7. Sugars and humic acids The mixture is efficiently mixed with the compressed air (Fig. 1(f)). Sugars and humic acids By this, the raised portion 7 and the ground improvement body 6 are separated vertically or the strength of the bottom of the raised portion 7 is reduced.

[0034] By separating the raised portion 7 and the ground improvement body 6 from each other vertically or by reducing the strength of the bottom of the raised portion 7, the work of removing the raised portion becomes easier and the removal of the raised portion can be carried out efficiently.

[0035] next, The above-mentioned The hollow head 8 of the treatment device for the rising portion will now be described in detail.

[0036] As shown in FIG. 2, the hollow head 8 has a bottom 12, a digging blade 10 for digging the raised portion 7 around the periphery of the lower end, and a Sugars and humic acids The drilling rod 3 of the base machine 1 is connected to the drilling rod 3 of the base machine 1 through an opening 13 at the upper end.

[0037] Next, an example of compressed air supply is shown in FIG.

[0038] At a construction site for constructing the ground improvement body 6, in addition to the base machine 1, an air compressor 15 and other heavy machinery are prepared. The air compressor 15 can be used there.

[0039] As an example, a compressed air supply hose 16 of an air compressor 15 is connected to the upper end of the drilling rod 3 of the base machine 1 after the work has been completed and the solidification material has been removed.

[0040] As a result, compressed air can be supplied to the hollow head 8 connected to the lower end of the drilling rod 3 via the drilling rod 3 of the base machine 1 .

[0041] And from the nozzle 11 of the hollow head 8 Sugars and humic acids By injecting the compressed air into the raised portion 7, the raised portion 7 is filled with the compressed air. Sugars and humic acids Equivalent 9 can be penetrated.

[0042] The base machine 1, hollow head 8 and air compressor 15 are used to press the bottom of the raised portion 7. Sugars and humic acids After that, the hollow head 8 was pulled up to check the inside, and the inside of the hollow head 8 was Sugars and humic acids There are no more 9 etc. left, and all Sugars and humic acids It was confirmed that the same amount 9 was supplied to any depth in the raised portion 7. [Explanation of symbols]

[0043] 1 Base Machine 3 Drilling rod 6 Ground improvement body 7. Excitement 8 Hollow Head 9 Sugars and humic acids etc. 10 Excavation blade 11 spout 12 Bottom 14 Connection part

Claims

[Claim 1] A method for treating a raised portion of a ground improvement body, characterized in that after completion of construction of a ground improvement body to the planned height, the raised portion is excavated to a desired depth, sugars such as sugar and starch which reduce hydration reactions or humic acid used in polymeric organic setting retarders are supplied to the excavated portion together with compressed air, the ground improvement body and the raised portion are separated into upper and lower parts, and then the raised portion is removed.

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