JP2008038410A - Driven member driving method and driven member for preceding excavation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driven member driving method for driving piles, sheet piles, etc. even into hard at a low cost, and to provide a driven member for use in preceding excavation. <P>SOLUTION: The driven member driving method has the steps of: carrying out the preceding excavation of the hard ground by using the driven member 10 for preceding excavation, which has excavation bits 12 at a distal end thereof; drawing out the driven member for preceding excavation during pouring of a hardener into a hole formed by the driven member for preceding excavation; and driving a driven member having almost the same cross sectional shape as that of the driven pile for preceding excavation. The driven member for preceding excavation is for use in the driving method. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a driving method for a driving material and a driving material for preceding excavation, and more particularly to a driving method using a driving material for preceding excavation having a drilling bit.

  There is known a down-the-hole hammer method in which a substantially circular excavation bit is hit with a down-the-hole hammer, and a hard ground in which rock is present is excavated by a rotary hitting action of the excavation bit by hitting (for example, Patent Document 1).

  In such a down-the-hole hammer method, since the ground is excavated by a substantially circular excavation bit, a substantially circular hole is formed in the ground. Thereafter, piles and sheet piles are inserted into the substantially circular holes and supported using a fixing material.

  Moreover, the vibro hammer construction method which drives a pile and a sheet pile directly into the ground using the vibration by a vibro hammer is known (for example, patent document 2). In addition, when the pile or sheet pile cannot be driven directly in the vibro hammer method, it is also known to use the water jet combined vibro hammer method using high-pressure jet water.

JP-A-9-31980 JP 2000-257065 A

  However, in the down-the-hole hammer method, unnecessary parts are excavated and backfilled by using a pre-excavation device that has a larger excavation cross section than the shape of piles and sheet piles that should be inserted into hard ground. There was a problem that the drilling time and cost increased. Further, the down-the-hole hammer method B method (Yagura method) often requires a temporary scaffold or a temporary gantry, and there is a problem that it takes time and cost to provide the temporary scaffold or the temporary gantry. Furthermore, in the down-the-hole hammer method, if the hole wall is not stable, a new injection tube must be inserted after the hammer is pulled out, and then a fixing material must be injected to stabilize the hole wall. There was also a problem that the working efficiency was worsened.

  In the vibro hammer method, piles and sheet piles are directly driven using the vibration of the vibro hammer, so there is a problem that it is difficult to drive piles and sheet piles into hard ground. In addition, as a method that can be used when piles cannot be driven by the Vibro Hammer method, the Vibro Hammer method with a water jet can be used, but under more severe construction conditions (for example, when the approximate N value is greater than 80), the Water Jet There is also a problem that it is difficult to use the combined vibro hammer method, and a large amount of turbid water by a high-pressure jet must be treated.

  Therefore, an object of the present invention is to provide a driving method for a driving material capable of driving a pile or a sheet pile into a hard ground at a low cost and a driving material for preceding excavation therefor.

  In order to solve the above-described problem, the driving method for driving material according to the present invention performs a pre-excavation of hard ground using a driving material for pre-excavation in which an excavation bit is arranged at a tip portion, and performs pre-excavation. The leading excavation driving material is pulled out while injecting the fixing material into the hole formed by the driving material, and the driving material having substantially the same shape as the preceding excavation driving material is inserted into the hole into which the fixing material has been injected. It has the process of placing.

  Further, in the driving method of the driving material according to the present invention, the driving material for the previous excavation has an air pipe for ejecting air from the excavation bit, and in the excavation process, it is hard while supplying air from the air pipe. It is preferable to excavate the ground. This is to appropriately remove the shaved pieces of hard ground so that optimum excavation proceeds in a short time and efficiently.

  Furthermore, in the driving method of the driving material according to the present invention, the driving material for preceding excavation has a fixing agent supply pipe for injecting the fixing material from the tip portion, and in the fixing agent injection process, the fixing material supply pipe It is preferable to pull out the driving material for preceding excavation while supplying the fixing material. This is because the fixing material is appropriately injected into the hole in which the driving material is placed.

  Furthermore, in the driving method of the driving material according to the present invention, the same construction equipment is used for the preliminary excavation of the hard ground by the driving material for the previous excavation, the extraction of the driving material for the previous excavation, and the driving of the driving material. Preferably, the construction equipment is a vibro hammer. Since all the processes can be performed with the same construction equipment, the cost can be reduced.

  In order to solve the above-described problems, a prior excavation driving material according to the present invention includes a support member, a first excavation bit disposed at a distal end of an excavation portion of the support member, and air to the first excavation bit. An air supply pipe for supplying gas, a second excavation bit arranged near the tip of the excavation part of the air supply pipe, and a fixing material for injecting a fixing material for fixing the driving material in the vicinity of the tip part A fixing material supply pipe and a third excavation bit arranged near the tip of the excavation part of the fixing material supply pipe are provided.

  In the prior excavation driving material according to the present invention, it is preferable that the first excavation bit is disposed closer to the distal end side of the excavation part than the second or third excavation bit. This is to appropriately protect the fixing material supply pipe or the air supply pipe.

  Further, in the preceding excavation driving material according to the present invention, the first excavation bit includes an air ejection port, a connection portion for connecting the air ejection port and the air supply pipe, and a connection portion. It is preferable to have a check valve provided. This is because the check valve prevents the air outlet from being blocked by the fixing material.

  Further, in the preceding excavation driving material according to the present invention, it is preferable that the first excavation bit is detachably disposed at the distal end of the excavation part of the support member. For example, when using steel sheet piles or steel pipe sheet piles as the driving material, it is possible to perform pre-excavation including the joint part, so if one-side pre-excavation for the next driving material is unnecessary, remove it. Can be used. This is so that it can be removed when excavation is unnecessary.

  In the driving method of the driving material according to the present invention, a hole is formed using the driving material for preceding excavation, and the driving material having a substantially the same cross section as that of the driving material for preceding drilling is formed in the formed hole. Therefore, unnecessary excavation and backfilling are unnecessary, and it is possible to drive the driving material at low cost without using many fixing materials with less energy and time.

  Furthermore, when the same construction equipment is used for each process, the cost can be further reduced.

  Hereinafter, a driving method for a driving material and a driving material for preceding excavation according to the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a tip of a drilling portion of a preceding excavation H steel pile 10 used as an example of a prior excavation driving material.

  As shown in FIG. 1, 16 excavation bits 12 are arranged at the distal end portion 11 of an H shape at the distal end of the excavation portion of the H steel pile 10 for excavation without gaps. Also, a bit 13 corresponding to the fixing material injection pipe 15 and two bits 14 corresponding to the two air pipes 17 are arranged inside the preceding excavation H steel pile 10.

  In FIG. 1, the shapes of bit 12, bit 13 and bit 14 are the same, but bits having different specifications can also be used. Each bit is provided with a plurality of ultra-hard chips and a plurality of air outlets for crushing hard ground including rock, consolidated clay, or large gravel (roll stone). A plurality of air outlets of each bit are connected to two air pipes 17.

  2 is a side view of the H steel pile 10 for excavation shown in FIG. 1, FIG. 2 (a) is a side view seen from the A side in FIG. 1, and FIG. 2 (b) is the B side in FIG. It is the side view seen from.

  As shown in FIG. 2, the preceding excavation H steel pile 10 is composed of a tip portion 11 and a main body 19, and one fixing material injection pipe 15 and two air pipes 17 are arranged on the inside thereof. ing. The fixing material injection pipe 15 has a fixing material injection port 16, and the other end is opened near the tip end 11. Also. A bit 13 is disposed at the tip of the opening on the distal end 11 side of the fixing material injection pipe 15 so as to ensure a sufficient space for discharging mortar.

  Each of the two air pipes 17 has an air supply port 18, and the other end is connected to the tip 11. The air supplied from the air supply port 18 is ejected from the air ejection port of each bit via the inside of the distal end portion 11. In addition, bits 14 are respectively disposed at portions where the air pipe 17 and the tip end portion 11 are connected.

  The bit 13 corresponding to the fixing material injection pipe 15 and the two bits 14 corresponding to the two air pipes 17 are arranged slightly shifted to the right in the figure from the position of the excavation bit 12. This is because the fixing material injection pipe 15 and the air pipe 17 are not easily damaged by an impact during excavation.

  3-8 is the figure explaining the operation | movement procedure of the placement method of the driving material which concerns on this invention taking the placement of the H steel pile as an example.

  FIG. 3 is a diagram illustrating a process of temporarily setting a ruler for placing an H steel pile.

A predetermined number of dragonfly piles 42 are driven using a vibro hammer 22 suspended on the hook 21 of the crane vehicle 20. The dragonfly pile 42 is a pile base on which the ruler 40 is placed, and the depth of driving may be such that the dragonfly pile 42 is self-supporting. Further, it is preferable to fix the ruler with at least two dragonfly piles 42. The vibro hammer 22 has a counterweight, a vibrator, and a chuck for securing a steel material, and is a device that places or pulls out a steel material using a vibration force generated by the vibrator. Thus, it is possible to use a known device.
FIG. 4 is a diagram illustrating a process of placing a steel pipe.

  When the temporary setting of the ruler 40 is completed, a steel pipe 50 (for example, φ700 mm) is driven by the vibro hammer 22. The steel pipe 50 has a hollow cylindrical shape made of a steel material, and penetrates the upper ground 30 before the H steel pile is placed in order to protect the hole wall or suppress muddy water. To the depth of. In addition, when the accumulated water generate | occur | produces in the steel pipe 50, it is preferable to drain with a submersible pump.

  FIG. 5 is a diagram illustrating a preceding excavation process.

  When the casting of the steel pipe 50 is completed, the pre-excavation is performed using the pre-excavation H steel pile 10. The pre-excavation is performed by building the pre-excavation H steel pile 10 in the steel pipe 50 and driving it with the vibro hammer 22. As described above, since the excavation bit 12 and the like are arranged at the tip 11 of the prior excavation H steel pile 10 for excavation, the hard ground such as the rock 31 is caused by the vibration force of the vibro hammer 22. It is possible to excavate to a predetermined depth (design depth). In particular, when excavating the rock 31, air was supplied from the compressor (not shown) to the supply port 18 of the air pipe 17, and the air was discharged from the tips of the bits 12, 13 and 14 and crushed. Eliminate bedrock. The discharge pressure of air from the compressor is preferably 0.7 MPa or more, for example.

  FIG. 6 is a diagram showing a drawing process of the preceding excavation H steel pile 10.

  When excavation by the pre-excavation H steel pile 10 is completed to the design depth, the pre-excavation H steel pile 10 is inserted into the vibratory hammer 22 while injecting a predetermined amount of mortar from the fixing material injection port 16 of the fixing material injection pipe 15. Use and pull out. The mortar injected from the fixing material injection port 16 is injected into the hole formed by the preceding excavation H steel pile 10 from the opening on the tip 11 side of the preceding excavation H steel pile 10.

  FIG. 7 is a diagram showing a process for placing an H steel pile (support pile).

  After pulling out the H steel pile 10 for excavation, the H steel pile 51 serving as a support pile is driven to a predetermined depth by the vibro hammer 22. Since the hole formed by the H steel pile reaches the inside of the rock 31 and mortar is also injected, the placed H steel pile 51 is firmly fixed to the rock 31. The H steel pile 51 has the same shape as the main body portion 19 of the preceding excavation H steel pile 10 for excavation.

  FIG. 8 is a diagram illustrating a process of pulling out the steel pipe 50.

  After the placement of the H steel pile 51 is completed, the steel pipe 50 is pulled out using the vibro hammer 22, and a series of steps for placing the H steel pile 51 is completed. In the above process, the steel pipe 50 was placed (see FIG. 4) and the steel pipe 50 was pulled out (see FIG. 8) for hole wall protection or muddy water control. At this time, when it is not necessary to consider pore wall protection or turbid water suppression, these steps can be omitted.

  FIG. 9 is a diagram illustrating an example of the ground state of the placed H steel pile 51 as seen from directly above the H steel pile 51.

  As shown in FIG. 9, an H steel pile 51 is fixed by a mortar 52 in a hole 60 formed by the preceding excavation H steel pile 10. Since the excavating bit 12 and the like are arranged at the tip 11 of the preceding excavation H steel pile 10, the main body portion 19 of the preceding excavation H steel pile 10 is excavated by the preceding excavation H steel pile 10. A hole 60 slightly larger than the cross section is formed. Accordingly, the H steel pile 51 is smoothly placed in the hole 60 formed by excavation by the preceding excavation H steel pile 10, and the bedrock 31 by the mortar 52 injected when the preceding excavation H steel pile 10 is pulled out. It is firmly fixed to.

  A circle 61 indicated by a dotted line in FIG. 9 shows an example of an inner diameter of a hole formed by using the down-the-hole hammer method when the H steel pile 51 is placed, for example. Thus, in the conventional construction method, since the substantially circular hole in which the H steel pile 51 enters was formed, the energy and time for formation of a hole were required so much. Moreover, in order to fix the H steel pile 51 in a big hole, so much mortar was required. Furthermore, for example, it is necessary to form a hole using construction equipment for the down-the-hole hammer method, and then use other construction equipment (for example, vibro hammer) to drive H steel, and a plurality of construction equipment Had to use.

  On the other hand, in the driving method of the driving material according to the present invention, a hole is formed by using the driving material for preceding excavation having substantially the same shape as the cross section of the driving material to be driven (in this example, the H steel pile). Without using a lot of mortar with less energy and time, because the driving material is driven and fixed in the hole formed using the same construction equipment as the construction equipment that formed the hole, It became possible to place the driving material at a low cost.

  In the example shown in FIGS. 1 to 9, the preceding excavation is performed using the preceding excavation H steel pile 10 (see FIG. 5), and then the H steel pile 51 is formed in the hole formed by the preceding excavation H steel pile 10. It was cast (see FIG. 7). However, the present invention can also be used when placing a driving material having another shape or specification. That is, the present invention can also be applied to a case where a hollow cylindrical steel pipe, sheet pile, steel pipe sheet pile or the like is driven as a driving material. Examples thereof will be described below.

  FIG. 10 is a diagram showing an example of the tip of the excavation part of the steel pipe pile 70 for excavation that can be used in the driving method of the driving material according to the present invention.

  As shown in FIG. 10, at the tip of the excavation part of the preceding excavation steel pipe pile 70, 36 excavation bits 12 are arranged at the tip of the hollow cylindrical steel pipe with no gap. Further, in the steel pipe pile 70 for pre-excavation, two bits 13 corresponding to fixing material injection pipes (not shown) and four bits 14 corresponding to air pipes (not shown) are arranged inside thereof. .

  Note that bits 12, 13, and 14 in FIG. 10 have the same specifications as the bits shown in FIG. Moreover, the bits 13 and 14 in the steel pipe pile 70 for excavation are arrange | positioned in the position slightly lower than the surface of the bit 12 similarly to the bits 13 and 14 in FIG. Further, the functions of the fixing material injection pipe and the air pipe arranged inside the preceding excavation steel pipe pile 70 are the same as those shown in the preceding excavation H steel pile 10 shown in FIG.

  FIG. 11 is a diagram illustrating an example of a grounded state of a placed steel pipe as viewed from directly above the steel pipe.

  The method of driving the steel pipe 71 using the steel pipe pile 70 for pre-excavation is the same as the method of driving the H steel pile 51 using the H steel pile 10 for pre-excavation shown in FIGS. is there. As shown in FIG. 11, a steel pipe 71 is fixed by a mortar 73 in a hole 72 formed by a steel pipe pile 70 for excavation. Since the excavation bit 12 and the like are disposed at the tip of the preceding excavation steel pipe pile 70 for excavation, a hole 72 slightly larger than the steel pipe is formed by excavation by the preceding excavation steel pipe pile 70. . Therefore, the steel pipe 71 is smoothly placed in the hole 72 formed by excavation by the preceding excavation steel pipe pile 70, and firmly fixed to the hard ground by the mortar 73 injected when the preceding excavation steel pipe pile 70 is pulled out. Is done.

  FIG. 12 is a view showing the tip of the excavation part of the steel pipe sheet pile pile 80 for excavation that can be used in the driving method of the driving material according to the present invention.

  As shown in FIG. 12, at the tip of the excavation part of the steel pipe sheet pile pile 80 for excavation, 36 excavation bits 12 are arranged at the tip of the hollow circular steel pipe without any gap. In addition, in the steel pipe sheet pile pile 80 for excavation, two bits 13 corresponding to fixing material injection pipes (not shown) and four bits 14 corresponding to air pipes (not shown) are arranged inside thereof. ing. Further, five bits 85 are arranged in the PP joint portion.

  Note that bits 12, 13, 14, and 85 in FIG. 12 have the same specifications as the bits shown in FIG. Moreover, the bits 13 and 14 in the steel pipe sheet pile pile 80 for pre-excavation are arrange | positioned in the position slightly lower than the surface of the bit 12 similarly to the bits 13 and 14 in FIG. Further, the functions of the fixing material injection pipe and the air pipe arranged inside the steel pipe sheet pile pile 80 for pre-excavation are the same as those shown in the H steel pile 10 for pre-excavation shown in FIG.

  FIG. 13: is a figure which shows an example which looked at the state on the ground of one steel pipe sheet pile placed from right above the steel pipe sheet pile.

  The method of driving the steel pipe sheet pile 81 using the steel pipe sheet pile pile 80 for pre-excavation is a method of driving the H steel pile 51 using the H steel pile 10 for pre-excavation shown in FIGS. It is the same. As shown in FIG. 13, a steel pipe sheet pile 81 is fixed by a mortar 83 in a hole 82 formed by a steel pipe sheet pile pile 80 for excavation. Since the excavation bit 12 and the like are arranged at the tip of the steel pipe sheet pile pile 80 for excavation, and the plurality of bits 85 are arranged also at the portion of the PP joint 84, the steel pipe sheet pile for the excavation. A hole 82 slightly larger than the steel pipe sheet pile 81 is formed by excavation by the pile 80 for use. Therefore, the steel pipe sheet pile 81 is smoothly placed in the hole 82 formed by the excavation by the steel pipe sheet pile pile 80 for the previous excavation, and is hardened by the mortar 83 injected when the steel pipe sheet pile pile 80 for the previous excavation is pulled out. It is firmly fixed to the ground.

  FIG. 14 is a diagram showing a case where a plurality of steel pipe sheet piles 81 are joined together.

  As shown in FIG. 14, a continuous wall having a large cross-sectional area can be constructed by connecting a plurality of steel pipe sheet piles 81 in the direction of arrow 86 to each other at the PP joint 84 portion. The joints of steel pipe sheet piles are not limited to PP joints, but there are PT joints, LT joints, etc., but according to the joint shape, the shape of the tip of the steel pipe sheet pile for pre-excavation is changed. It is possible to deal with various types of joints by changing the bit arrangement.

  Moreover, in FIG. 14, when building a continuous wall in the direction of arrow 86, it is not necessary to provide joints on both the left and right sides of the steel pipe sheet pile as the starting point. Then, as shown in FIG. 14, the steel pipe sheet pile 85 which has a joint only in one side was used for the starting point. For the starting steel pipe sheet pile 85, as shown in FIG. 16, using the steel pipe sheet pile pile 87 for excavation that forms a hole only in one joint portion as shown in FIG. The sheet pile 85 can be firmly fixed to the hard ground. Since the placing method for the steel pipe sheet pile 85 for the starting point is the same as the placing method for the steel pipe sheet pile pile 80 for preceding excavation, the description thereof is omitted.

  FIG. 17 is a view showing the tip of the excavation part of the steel sheet pile 90 for excavation that can be used in the driving method of the driving material according to the present invention.

  As shown in FIG. 17, at the tip of the excavation part of the preceding excavation steel sheet pile 90, ten excavation bits 12 are arranged at the tip of the substantially trapezoidal sheet pile without any gap. In addition, in the steel sheet pile 90 for excavation, one bit 13 corresponding to a fixing material injection pipe (not shown) and two bits 14 corresponding to an air pipe (not shown) are arranged on the inner side. . Further, three bits 95 are arranged on the right joint portion of the steel sheet pile 90 for pre-excavation, and three bits 96 are arranged on the left joint portion of the steel sheet pile 90 for pre-excavation.

  Note that bits 12, 13, 14, 95 and 96 in FIG. 17 have the same specifications as the bits shown in FIG. Moreover, the bits 13 and 14 in the steel sheet pile 90 for excavation are arrange | positioned in the position a little lower than the surface of the bits 12, 95, and 96 similarly to the bits 13 and 14 in FIG. Furthermore, the functions of the fixing material injection pipe and the air pipe arranged inside the preceding excavation steel sheet pile 90 have the same specifications as those shown in the preceding excavation H steel pile 10 shown in FIG.

  FIG. 18 is a diagram illustrating an example of the state of one placed steel sheet pile on the ground as viewed from directly above the steel sheet pile.

  The method of driving the steel sheet pile 91 using the steel sheet pile 90 for pre-excavation is the same as the method of driving the H steel pile 51 using the H steel pile 10 for pre-excavation shown in FIGS. It is. As shown in FIG. 18, a steel sheet pile 91 is fixed by a mortar 93 in a hole 92 formed by the steel sheet pile 90 for excavation. Since the excavation bit 12 and the like are disposed at the tip of the preceding excavation steel sheet pile 90, a hole 92 slightly larger than the steel sheet pile 91 is formed by excavation by the preceding excavation steel sheet pile 90. Therefore, the steel sheet pile 91 is smoothly placed in the hole 92 formed by excavation by the steel sheet pile 90 for preceding excavation, and is firmly fixed to the hard ground by the mortar 93 injected when the steel sheet pile 90 for previous excavation is pulled out. Fixed.

  FIG. 19 is a diagram illustrating a case where a plurality of steel sheet piles 91 are joined together.

  As shown in FIG. 19, a continuous wall can be constructed by connecting a plurality of steel sheet piles 91-1 to 91-8 to each other in the direction of an arrow 94.

  By the way, when the steel sheet pile 91-2 is driven after the steel sheet pile 91-1 is driven, the position of the steel sheet pile 90 for the previous excavation is compared with the case where the hole for the steel sheet pile 91-1 is drilled. Must be reversed to drill a hole for the steel sheet pile 91-2. In that case, since the hole of the joint part on the left side in the drawing of the steel sheet pile 91-2 has already been formed by the excavation of the hole for the steel sheet pile 91-1, it is not necessary to excavate the part again. That is, in FIG. 17, it is not always necessary to arrange the three bits 95 arranged at the joint portion on the right side in the drawing. Similarly, when the steel sheet pile 91-3 is driven after the steel sheet pile 91-2 is driven, the steel sheet pile 90 for leading excavation is compared with the case where the hole for the steel sheet pile 91-2 is drilled. The hole for steel sheet pile 91-3 must be excavated by reversing the position. In that case, since the hole of the joint part on the left side in the drawing of the steel sheet pile 91-3 has already been formed by the excavation of the hole for the steel sheet pile 91-2, it is not necessary to excavate the part again. That is, in FIG. 17, it is not always necessary to arrange the three bits 96 arranged at the joint portion on the left side in the drawing.

  Therefore, when building a continuous wall by connecting a plurality of steel sheet piles 91-1 to 91-8 to each other, it is configured so that the bits of the left and right joint portions of the steel sheet pile 90 for excavation can be removed alternately. Is preferred. That is, when placing the steel sheet pile 91-2, the three bits 95 arranged at the right joint portion of the steel sheet pile 90 for preceding excavation are removed, and when placing the steel sheet pile 91-3, the previous excavation is performed. Excavation is performed by removing the three bits 96 arranged at the joint portion on the left side of the steel sheet pile 90.

  20 and 21 are diagrams showing another excavation bit that can be used for the prior excavation driving material according to the present invention.

  20 (a) is a top view of the bit 100, FIG. 20 (b) is a side view of the bit 100, FIG. 21 (a) is a BB ′ sectional view of FIG. 20, and FIG. It is a figure which shows the operating condition of a non-return valve. 20 and FIG. 21 includes a pre-excavation H steel pile 10 shown in FIG. 1, a pre-excavation steel pipe pile 70 shown in FIG. 10, a pre-excavation steel pipe sheet pile pile 80 shown in FIG. It can be used in place of the other pre-excavation steel pipe sheet pile piles 87 shown and the bits 12, 85, 95 and 96 used in the pre-excavation steel sheet pile 90 shown in FIG.

  As shown in FIG. 20A, eight ultra-hard chips 101 are arranged on the upper surface of the bit 100, and two air jets are formed on the side surface of the bit 100 as shown in FIG. An outlet 102 is provided. In addition, the air jet shown in FIG.20 (b) is provided in the side surface of the location of the arrow C of Fig.20 (a), and another air jetting port is in the side of the location of the arrow D of Fig.20 (a). Is provided.

  As shown in FIG. 21 (a), the bit 100 has a connecting part 110 that is connected to, for example, the air pipe 17 and the leading end part 11 of the preceding excavation H steel pile 10 and is continuous with the air outlet 102. The connecting portion 110 includes a spring 111, a ball 112, a stopper 113 for holding the ball 112, and a check valve structure using a jig 114 for fixing the stopper in the connecting portion 110. In the check valve structure, as shown in FIG. 21 (b), when air is supplied from the direction of arrow E, the ball 112 is pushed by the force of air so that the supplied air can be ejected from the ejection port 102. However, when the supply of air is stopped, the ball 112 is pushed down to the stopper 113 by the elasticity of the spring 111, and the jet port 102 and the connection part 110 are shut off. Therefore, for example, when the preceding excavation H steel pile 10 is pulled out while supplying the fixing material (see FIG. 6), mortar is injected from the fixing material injection pipe 15 of the preceding excavation H steel pile 10. In addition, it is possible to prevent the mortar from entering from the ejection port 102 to the inside of the connection portion 110 and clogging the connection portion 110 with the mortar.

  The above-mentioned H steel pile 10 for pre-excavation shown in FIG. 1, the steel pipe pile 70 for pre-excavation shown in FIG. 10, the pile 80 for steel pipe piles for pre-excavation shown in FIG. 12, and the steel pipe sheet pile for other pre-excavation shown in FIG. The number of bits used in the pile 87 and the steel sheet pile 90 for excavation shown in FIG. 17 is an example, and different numbers of bits may be arranged depending on the shape and specifications of the prior excavation driving material. Is possible. Further, the H steel pile 10 for pre-excavation shown in FIG. 1, the steel pipe pile 70 for pre-excavation shown in FIG. 10, the pile 80 for steel pipe piles for pre-excavation shown in FIG. 12, and the steel pipe sheet pile for other pre-excavation shown in FIG. The number of fixing material injection pipes and air pipes arranged on the pile 87 and the steel sheet pile 90 for excavation shown in FIG. 17 is an example, and the number of fixings varies depending on the shape and specifications of the prior excavation driving material. It is possible to arrange material injection piping and air piping.

  Further, the H steel pile 10 for pre-excavation shown in FIG. 1, the steel pipe pile 70 for pre-excavation shown in FIG. 10, the pile 80 for steel pipe sheet pile for pre-excavation shown in FIG. 12, and the steel pipe sheet pile for other pre-excavation shown in FIG. The various bits used in the pile 87 and the steel sheet pile 90 for excavation shown in FIG. 17 are also examples, and bits having other shapes and specifications (for example, see FIGS. 20 and 21) may be used. In the above description, the various bits described above are fixed to the tip of the excavation part, but may be rotatably arranged in accordance with the terrain conditions.

  In addition, in the placing method of the placing material according to the present invention, mortar is used to fix the placing material, but other fixing materials such as cement milk and bentonite can also be used. However, as will be described later, since the fixing material is injected through the supply pipe, it is necessary to prevent clogging in the supply pipe, and in that respect, it is preferable to use a material with high fluidity such as cement milk or bentonite. .

It is a figure which shows the excavation part front-end | tip of the H steel pile for a prior excavation used for this invention. It is a side view of the H steel pile for a prior excavation shown in FIG. It is a figure which shows the process of temporarily installing the ruler for placing a driving material. It is a figure which shows the process of placing a steel pipe. It is a figure which shows a prior | preceding excavation process. It is a figure which shows the extraction process of the H steel pile for prior excavation. It is a figure which shows the placing process of H steel pile (support pile). It is a figure which shows the process of extracting a steel pipe. It is a figure which shows an example of the state in the ground of the placed H steel pile. It is a figure which shows the excavation part front-end | tip of the steel pipe pile for another prior excavation used for this invention. It is a figure which shows an example of the state in the ground of the cast steel pipe. It is a figure which shows the excavation part front-end | tip of the steel pipe pile for another prior excavation used for this invention. It is a figure which shows an example of the state in the ground of one steel pipe sheet pile placed. It is a figure which shows the case where two or more steel pipe sheet piles are joined together. It is a figure which shows the excavation part front-end | tip of the pile for the steel pipe sheet pile for other prior excavation used for this invention. It is a figure which shows an example of the state on the ground of one other steel pipe sheet pile placed. It is a figure which shows the excavation part front-end | tip of still another steel sheet pile for prior excavation used for this invention. It is a figure which shows an example of the state in the ground of one steel sheet pile placed. It is a figure which shows the case where two or more steel sheet piles are joined together. (A) is a top view of another bit, and (b) is a side view of the bit shown in (a). (A) It is sectional drawing of the bit shown in FIG. 20, (b) is a figure for demonstrating the function of a non-return valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 H steel pile for pre-excavation 12, 13, 14 Bit for excavation 22 Vibro hammer 50 Steel pipe 51 H Steel pile 70 Steel pipe pile for pre-excavation 71 Steel pipe 80, 87 Pile for steel pipe sheet pile for pre-excavation 81 Steel pipe sheet pile 90 Steel for pre-excavation Sheet pile 91 steel sheet pile

Claims (9)

A method for placing a driving material,
Precise excavation of the hard ground using the prior excavation material in which the excavation bit is arranged at the tip,
While injecting a fixing material into the hole formed by the preceding excavation driving material, pulling out the preceding excavation driving material,
Placing a driving material having substantially the same cross-sectional shape as the preceding excavation driving material in the hole into which the fixing material has been injected,
A method for placing a driving material comprising a step. The preceding excavation driving material has an air pipe for ejecting air from the excavation bit,
2. The driving method according to claim 1, wherein in the excavation step, hard ground is excavated while air is supplied from the air pipe. The prior excavation driving material has a fixing agent supply pipe for injecting the fixing material from the tip,
3. The driving material placing method according to claim 1, wherein, in the fixing agent injection step, the driving material for leading excavation is pulled out while supplying the fixing material to the fixing material supply pipe.   The preceding excavation of the hard ground by the driving material for the preceding excavation, the extraction of the driving material for the preceding excavation, and the placement of the driving material are all performed by the same construction equipment. The placing method of the placing material according to the item.   The preceding excavation of the hard ground by the driving material for the preceding excavation, the extraction of the driving material for the preceding excavation, and the placement of the driving material are all performed by a vibro hammer. The placing method of the placing material described in 1. A prior excavation driving material for placing the driving material,
A support member;
A first excavation bit disposed at the excavation part tip of the support member;
An air supply pipe for supplying air to the first excavation bit;
A second excavation bit disposed near the excavation part tip of the air supply pipe;
A fixing material supply pipe for injecting a fixing material for fixing the driving material in the vicinity of the tip portion;
A third excavation bit arranged in the vicinity of the excavation part tip of the fixing material supply pipe;
A driving material for preceding excavation characterized by comprising:   The driving material for preceding excavation according to claim 6, wherein the first excavation bit is disposed closer to a distal end side of the excavation part than the second or third excavation bit.   The first excavation bit has an air ejection port, a connection portion for connecting the air ejection port and the air supply pipe, and a check valve provided in the connection portion. The driving material for preceding excavation according to 6 or 7.   The driving material for preceding excavation according to any one of claims 6 to 8, wherein the first excavation bit is detachably disposed at a distal end of the excavation part of the support member.

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