JP2008008091A - Pile for civil engineering and method for ascertaining projection of wedge of pile for civil engineering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for ascertaining projection of wedges of a pile for civil engineering by which it can be ascertained that the wedges housed inside a pile body surely project into the ground, and to provide the pile for the civil engineering enabling the method for ascertaining the projection of the wedge. <P>SOLUTION: In the pile 1 for the civil engineering, strain gauges are fitted to a plurality of wedges 6 housed in the hollow piles 2A, 2B. In the method for ascertaining the projection of the wedges of the pile for the civil engineering, driving of the wedges 6 into the ground is ascertained by measuring the strain generated when the wedges 6 project into the ground by using the strain gauges fitted to the wedges 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a civil engineering pile and a method for confirming the protrusion of a wedge body of a civil engineering pile, and more specifically, for civil engineering work capable of confirming that a wedge body embedded in the pile body protrudes into the soil. The present invention relates to a method for confirming protrusion of a wedge body and a pile for civil engineering work.

  Conventional piles for civil engineering work are generally formed in a cylindrical cone shape or columnar shape with concrete or iron material, and when used in various constructions such as building construction and revetment construction, they are driven vertically or diagonally into the soil. It was to be used. Therefore, even if the pile is hit in a place where the soil is fragile or the ground is soft, the pile itself is not stable, and it sways or falls out. Moreover, even if the ground is hard, there is a problem that the piles for civil engineering that have been driven in over time will be swayed or raised. Furthermore, also in terms of earthquake resistance, conventional civil engineering piles have instability. If the piles for civil engineering work are swaying, unstable, or raised in this way, the construction itself is dangerous, and there is a considerable risk even after the completion of construction. there were. Therefore, the present applicant has improved such drawbacks and inconveniences and developed a civil engineering pile that can maintain a more stable state in the soil (Japanese Patent Laid-Open No. 08-269950 (Patent Document 1), Japanese Patent Laid-Open No. 09-2009). No. 003884 (Patent Document 2), JP-A-11-323923 (Patent Document 3)).

  In the inventions of Patent Documents 1 to 3, generally, the tip is formed in a cone or pyramid shape, the other end is an opening and a connection portion, the inside is formed in a hollow shape, and a plurality of openings are formed in the side wall. The pile body was provided with a core body with a plurality of wedge bodies with sharp edges formed at the tip, and after driving the pile body into the soil, the wedge body was further like a tree root It is characterized by being able to protrude into the soil and be securely fixed in the soil. In addition, this pile body can be buried deeper in the soil by successively connecting another joint pile body to the upper side.

Japanese Patent Laid-Open No. 08-269950 JP 09-003884 A JP-A-11-323923

  The above-mentioned pile for civil engineering works has a remarkable effect, but since the pile body is buried in the soil, whether or not a plurality of wedge bodies surely protrude from the pile body and is stuck in the soil. It was difficult to confirm. In addition, if some wedge bodies do not protrude from the pile body, the original performance may not be exhibited.

  Therefore, in order to solve such a problem, the present invention is a method for confirming the wedge body protrusion of a pile for civil engineering work, which can confirm that the wedge body incorporated in the pile body has surely protruded into the soil. It is an object of the present invention to provide a pile for civil engineering work that enables such a wedge body protrusion confirmation method.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is for civil engineering work in which a plurality of wedge bodies, which are housed in a hollow pile body, are projected to the outside of the pile body so as to be rooted in the soil. In the pile, a strain gauge is attached to the wedge body.

  In order to solve the above-mentioned problem, the present invention according to claim 2 is the civil engineering pile according to claim 1, wherein the wedge body is formed by attaching an intermediate layer between two plate members and bonding them together. A space portion is formed in the space portion, and a strain gauge is provided in the space portion.

  In order to solve the above-mentioned problem, the present invention according to claim 3 is the civil engineering pile according to claim 1, wherein the wedge body has a space portion formed therein by attaching a plate member having a recess on at least one side. And a strain gauge is provided in the space.

  In order to solve the above-mentioned problem, the present invention described in claim 4 is the civil engineering pile according to claim 1, wherein the wedge body has a recess at a predetermined location and a strain gauge is attached to the recess. It is characterized by.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is the civil engineering pile according to claim 1, wherein the wedge body includes a metal pipe having a hollow portion with a space portion in the inside from both sides. It is formed by crushing so as to be held, and a strain gauge is built in the space.

  In order to solve the above-mentioned problems, the present invention according to claim 6 is a civil engineering pile for driving a plurality of wedge bodies, which are built in a hollow pile body, to protrude outside the pile body so as to be rooted in the soil. The guide means for guiding the strain gauge attached to the flexible metal thin plate to the wedge body is formed so as to be inserted into the pile body.

  In order to solve the above-mentioned problem, the present invention according to claim 7 is the civil engineering pile according to claim 6, wherein the wedge body has a hollow for guiding a strain gauge inserted into the pile body into the wedge body. A portion is formed.

  In order to solve the above-mentioned problem, the present invention according to claim 8 is a civil engineering pile in which a plurality of wedge bodies housed in a hollow pile body are protruded to the outside of the pile body so as to be rooted in the soil. In the wedge body protrusion confirmation method, a strain gauge is attached to the wedge body, and it is confirmed that the wedge body has been driven into the soil by measuring strain generated when the wedge body projects into the soil. To do.

  In order to solve the above-mentioned problem, the present invention according to claim 9 is a civil engineering pile for driving a plurality of wedge bodies, which are internally provided in a hollow pile body, to protrude outside the pile body so as to be rooted in the soil. In the method for confirming the protrusion of a wedge body, a step of driving a pile body provided with a wedge body into the soil, a step of projecting the wedge body from the pile body driven into the soil, and flexibility in the pile body Inserting a strain gauge attached to a thin metal plate and guiding it to the wedge body, and confirming that the wedge body was driven into the soil by measuring the strain when the strain gauge was inserted And a step of performing.

  According to the civil engineering pile according to the present invention, since the strain gauge is attached to the wedge body, the wedge body is reliably detected by detecting the internal stress of the wedge body generated by the resistance received when the wedge body protrudes into the soil. It has the effect of knowing whether or not it has been projected into the ground. Also, after placing the pile body in the soil, it was decided to insert the strain gauge into the pile body and check the shape of the wedge body by strain, so check whether the wedge body was surely protruded into the soil There is an effect that can be.

  According to the method for confirming the protrusion of a wedge body for a civil engineering work pile according to the present invention, the wedge body is reliably protruded into the soil by detecting strain generated by the resistance received when the wedge body protrudes into the soil. Confirm whether or not. Thereby, there exists an effect that it can be determined easily whether it was constructed reliably. And when it is confirmed that the wedge body does not protrude, it is possible to take the countermeasure immediately, so that it is possible to effectively prevent the building or the structure from being insufficient in strength.

  Hereinafter, the pile for civil engineering work according to the present invention and the wedge body protrusion confirmation method for the pile for civil engineering work will be described based on preferred embodiments. FIG. 1 is a perspective view of an embodiment of a civil engineering pile according to the present invention. The illustrated civil engineering pile 1 is generally configured to include a leading pile body 2A and a joint pile body 2B, and is substantially the same as a conventional civil engineering pile body in appearance.

  First, the leading pile body 2A is formed with a cone or a pyramid at the tip, and the other end side is opened, and the edge of the opening is connected to a joint pile body 2B described later. It has become. Further, the inside of the leading pile body 2A is closed at least in a liquid-tight manner within a certain range on the distal end side, and is formed in a hollow shape in the other end side direction. A plurality of openings 4, 4 are provided on the side wall of the leading pile body 2 </ b> A for projecting wedge bodies 6, 6 described later from the side wall. The openings 4 and 4 can be provided at appropriate locations on the side walls, but in the present embodiment, the openings 4 and 4 are regularly arranged in two upper and lower stages and symmetrically. And, as shown in FIG. 4, core bodies 5A and 5B provided with a plurality of wedge bodies 6 and 6 having tips formed at acute angles are mounted inside the thus formed leading pile body 2A. Yes. The wedge bodies 6 and 6 are formed by being arranged in a state where two wedge bodies 6 and 6 having different lengths are combined so as to protrude from the respective openings 4 and 4.

  On the other hand, the joint pile body 2B is connected and fixed to the leading pile body 2A to form a long pile 1 for civil engineering work. As shown in FIGS. 1 to 3, the joint pile body 2 </ b> B is formed so that the inside is hollow and both ends are open, and one end is formed to be connectable to the leading pile body 2 </ b> A. Yes. Moreover, the connection part 3 is formed in the other end side, ie, the edge part on the opposite side to the leading pile body 2A side. And the opening parts 4 and 4 are provided in the side wall of the joint pile body 2B similarly to the leading pile body 2A. The joint pile body 2B is different from the leading pile body 2 formed in a conical or pyramidal shape in that the tip is an opening connected to the leading pile body 2A, but other configurations are substantially the same.

  In the leading pile body 2A, the connecting portion 3 formed on the leading pile body 2A and the joint pile body 2B is formed in a cone or pyramid shape and is an end opposite to the tip side, and is joined to the joint pile body 2B. On the other hand, the joint pile body 2B is formed on the outer side of the opening edge on the opposite end side to the side fixed to the leading pile body 2. Yes. Then, the joint pile body 2B is fitted and fixed to the connecting portion 3 of the lead pile body 2A, so that the lead pile body 2A and the joint pile body joint pile body 2B are used as one civil engineering pile 1. Become functional. Moreover, it can be used as a longer pile 1 for civil engineering work by fitting and fixing another joint pile body 2B to the connection portion 3 of the joint pile body 2B. Further, the connection portion 3 is regularly provided with opening portions 3a and 3a, and the opening portion 3a of the leading pile body 2A and the opening portion 3a of the joint pile body 2B are made to coincide with each other. The pile body 2A and the joint pile body 2B can be easily aligned. In addition, in order to make fitting joining easy, it can also be made to connect by providing a screw-shaped groove | channel inside the connection part 3, and screwing the leading pile body 2A and the joint pile body 2B.

  4 and 5, the core body 5A is mounted in the leading pile body 2A, and the core body 5B is mounted on the joint pile body 2B. The core body 5B is configured to have the medium hit body 7, but the core body 5A is not provided with it. The middle hitting body 7 is attached and fixed in the vertical direction in the same manner as the wedge bodies 6 and 6 at the center of the core body 5B mounted in the joint pile body 2B. The intermediate striking body 7 presses the core body 5B so as to press the core body 5A in the leading pile body 2A while moving in the downward direction, that is, in the joint pile body 2B toward the tip of the civil engineering pile 1. It has become. Accordingly, the wedge bodies 6 and 6 attached to the core body 5A are protruded from the openings 4 and 4, and at the same time, the wedge bodies 6 and 6 provided in the core body 5B are also protruded. Therefore, it is not necessary to provide the middle hit body 7 in the core body 5A. An appropriate number of wedge bodies 6 and 6 are arranged on the core bodies 5A and 5B, but in this embodiment, the core bodies 5A and 5B are regularly symmetric with two on the front and back and a slight height on the left and right. Eight wedge bodies 6, 6 are provided. However, the number does not necessarily need to be 8, and an appropriate number of 6 or 10 can be adopted.

  A notch or cut surface 9 is formed in the upper part of the core body 5A, 5B, and it becomes possible to insert, for example, a “pipe” into the inside of the leading pile body 2A and the joint pile body 2B from this gap. It becomes possible to inject materials such as cement and water glass into the civil engineering pile 1 through the “pipe”. By comprising in this way, the civil engineering pile 1 can be more firmly fixed in the soil.

  The wedge bodies 6 and 6 are sword-shaped members whose tips are formed in acute angles. By forming in this way, protrusion into the soil is facilitated, and deeper penetration into the soil can be achieved. Of course, other shapes can be employed. The front ends of the wedge bodies 6 and 6 are arranged so as to be in contact with the inner ends of the openings 4 and 4 respectively. A pocket metal fitting 8 as shown in FIG. 6 for guiding the wedge bodies 6 and 6 to the openings 4 and 4 can be provided. With this pocket metal fitting 8, the wedge bodies 6, 6 can be easily protruded from the openings 4, 4. Moreover, you may provide the notch 10 in the both-sides edge part or one side edge part of the wedge bodies 6 and 6. FIG. By providing the notch 10, it becomes possible to increase the root strength of the wedge bodies 6, 6.

  Further, the wedge body 6 is internally provided with a strain gauge 20. FIG. 7 is a cross-sectional view of the wedge body 6 in which the strain gauge 20 is housed. That is, the wedge body 6 includes two outer plates 6a and 6a having a sharp sword-shaped tip, and a half of the width of the outer plates 6a and 6a between the two outer plates 6a and 6a. The inner plates 6b and 6b having a smaller width are bonded to each other in a sandwich shape, and a space is formed between the two inner plates 6b and 6b serving as an intermediate layer. ing. And the strain gauge 20 (refer FIG. 8) is arrange | positioned in the space part formed in that way. A cord 21 is extended from the strain gauge 20, and when the wedge body 6 protrudes into the soil, the strain generated by the compressive force that the wedge body 6 receives from the soil is detected by the strain gauge 20 and sent to a measuring device (not shown). It is like that. Expansion and contraction occur when an external force is applied to the metal, but the strain gauge 20 detects a change in resistance value at that time. The strain gauge 20 is preferably a thin plate or film.

  Further, the wedge body 6 may be formed so that a space portion is formed inside by laminating an outer plate 6a which is a plate member having a recess on at least one side, and the strain gauge 20 is housed in the space portion. it can. That is, as shown in FIG. 9A, the outer plate 6a having a recess formed on the surface and the outer plate 6a not formed with such a recess are distorted in a space formed by bonding two sheets. A gauge 20 can be placed. Of course, the space part for arrange | positioning the strain gauge 20 can also be formed by bonding together the two outer plates 6a, 6a each having a recess formed on the surface, with the recesses facing each other (see FIG. 9 (b)).

  Since the strain due to the compressive force applied to the wedge body 6 when it protrudes into the soil is measured by attaching the strain gauge 20 to the inside of the wedge body 6 in this way, the wedge body 6 reliably protrudes into the soil. It can be confirmed whether or not. That is, when the wedge bodies 6 and 6 protrude from the side walls of the leading pile body 2A and the joint pile body 2B by pushing down the core bodies 5A and 5B and are pierced into the soil, the wedge body 6 is compressed in the compression direction due to the resistance generated at that time. Power is added to. Therefore, if the distortion generated at this time is measured, it is possible to confirm whether or not the wedge body 6 protrudes into the soil. When the measured value is smaller or larger than a predetermined range, it is determined that the wedge body 6 does not protrude correctly. That is, the measured value is small because no distortion occurs in the wedge body 6, and the measured value is large because the wedge body 6 does not protrude from the opening 4 and the leading pile body 2A or the joint pile body 2B. This is because it is considered that the wedge body 6 is caught on the side wall or is blocked by a hard substance such as a rock. The strain gauges 20 are preferably arranged on all the wedge bodies 6 and 6.

  On the other hand, the attachment of the strain gauge 20 will be described with respect to another embodiment. FIG. 10 is a cross-sectional view of the leading pile body 2A, and the strain gauge 20 is attached with a structure different from that described above. That is, in this embodiment, the wedge bodies 6 and 6 are formed with recesses along the longitudinal direction at predetermined locations, and the strain gauges 20 are attached to these recesses. As shown in the drawing, a strain gauge 20 is disposed on each of the wedge bodies 6 and 6 projecting in all directions. The recess can be formed by pressing the wedge bodies 6 and 6 at a predetermined position with a press device, but may be formed by other methods. Note that the attachment position of the strain gauge 20 is not limited to the illustrated one, and can be attached to an appropriate position. The strain gauge 20 can be attached to the wedge bodies 6 and 6 by an appropriate method such as screwing, welding, or adhesive.

  Furthermore, the thing of embodiment different from what was mentioned above about attachment of the strain gauge 20 is demonstrated. The wedge body 6 shown in FIG. 11 is formed by crushing a metal pipe provided with a hollow portion from both sides so that the space portion is held therein. As a metal pipe provided with a hollow portion, for example, there is a hollow steel pipe. In FIG. 11, such a steel pipe 6c is crushed from both sides so that a space portion is held in the inside, and is formed in the inside. A strain gauge 20 is provided in the space. In addition, when crushing the steel pipe 6c, a jig (not shown) is disposed in the interior of the steel pipe 6c in advance, and after the crushing of the steel pipe 6c, the jig (not shown) is removed to form a space inside the wedge body 6. You can also do it.

  The wedge projecting confirmation method for a civil engineering pile according to the present invention will be described while explaining the usage and operation of the civil engineering pile 1 configured as described above. FIG. 12 is a flowchart in an embodiment of the method for confirming the protrusion of a wedge body for a civil engineering pile according to the present invention.

  First, when a large strength is required, for example, for earthquake resistance or revetment, the leading pile body 2A is first driven into the soil (step S1). Thereafter, the necessary number of joint pile bodies 2B are repeatedly connected (step S2). When the connecting connection to the required depth is completed and the driving to the required depth is completed, the core bodies 5A and 5B are pressed with other parts or other members prepared for the civil engineering pile 1 (Step S3). Thereby, core body 5A, 5B moves to the front-end | tip direction of the pile 1 for civil engineering, and the wedge bodies 6 and 6 will protrude outside (in the soil), and will be in the state which stretched the root (step S4). Then, the strain of the wedge bodies 6 and 6 caused by the external force received from the soil at that time is detected and measured by the strain gauge 20 (step S6). And it is determined whether the wedge bodies 6 and 6 were reliably protruded in the soil by confirming the measured numerical value (step S7). By repeating the above operations, the civil engineering pile 1 can be reliably constructed.

  On the other hand, if the civil engineering pile 1 is used in a simple location, only the leading pile body 2A can be used. In this case, the leading pile body 2A is pierced into the soil from the tip direction, the piercing is stopped at a necessary limit, and then the core body 5A is pressed by another member, thereby moving the core body 5A in the tip direction. Move to. As a result, the wedge bodies 6 and 6 protrude outside (in the soil) and are inserted into the soil.

Next, a pile body for civil engineering work in still another embodiment will be described.
The civil engineering pile main body described so far is in a state in which the strain gauge 20 is attached to the wedge bodies 6, 6. However, the civil engineering pile main body of the embodiment described below is After being installed, the protrusion of the wedge bodies 6 and 6 can be confirmed by inserting a metal thin plate 25 with a strain gauge 20 attached into the civil engineering pile main body. That is, the pile main body 1 for civil engineering work in the present embodiment is generally formed by the leading pile body 2A (see FIG. 13), but the main configuration is the same as described above, so the description here is as follows. Omitted. The leading pile body 2A is formed such that a guide member 12 for guiding the strain gauge 20 from the upper side to the wedge bodies 6 and 6 can be inserted.

  As shown in FIGS. 13 to 15, the guide member 12 is formed in a shape that can be inserted into the leading pile body 2 </ b> A by a hollow metal member. That is, if the cross-sectional shape of the leading pile body 2A is rectangular, the guide member 12 is also shaped like a square tube. If the cross-sectional shape of the leading pile body 2A is circular, the guide member 12 is also shaped like a cylinder. Is done. In the inside of the guide member 12, passages 14 and 14 are formed for guiding the flexible metal thin plate 25 to which the strain gauge 20 is attached to the wedge bodies 6 and 6. The passages 14 and 14 are provided in two stages on the inner wall surface of the guide member 12 so that the inserted strain gauges 20 reach the wedge bodies 6 and 6 protruding in the upper and lower stages. .

  On the other hand, FIG. 18 is a perspective view of a thin metal plate 25 having a strain gauge 20 inserted into the passages 14 and 14. The thin plate 25 is formed long, for example, of stainless steel, and a strain gauge 20 is attached in the vicinity of the tip. The basic function and configuration of the strain gauge 20 are as described above. In this embodiment, the thin plate 25 is inserted into the passages 14 and 14 of the guide member 12 inserted into the leading pile body 2A, and protrudes into the soil. The strain generated when the thin plate 25 is curved along the shape of the wedge bodies 6, 6 is measured by the strain gauge 20 attached to the thin plate 25, and the data is illustrated by the cords 21, 21 attached to the strain gauge 20. Not to be sent to measuring equipment. Handles 15 and 15 are attached to the upper outer surface of the guide member 12 for insertion into and removal from the leading pile body 2A.

  Furthermore, in the pile main body 1 for civil engineering work in the present embodiment, the wedge bodies 6 and 6 can be formed as follows. That is, as shown in FIGS. 16 and 17, the wedge bodies 6 and 6 have hollow portions 6 d and 6 d formed therein, respectively, and the strain gauges 20 inserted by the guide member 12 are further connected to the wedge bodies 6 and 6. The inner hollow portions 6d and 6d are guided. As a result, the thin plate 25 having the strain gauge 20 traces the shape of the wedge bodies 6 and 6 protruding into the soil. It becomes possible to confirm the protruding state of 6. In addition, the wedge bodies 6 and 6 in this embodiment are fixed by welding the base end side to the side surface of the core body 5A having a rectangular tube shape in two stages (see FIG. 17).

Another embodiment of the method for confirming the protrusion of a wedge body of a civil engineering pile according to the present invention will be described while explaining the usage and operation of the aforementioned civil engineering pile 1. FIG. 18 is a flowchart in one embodiment of a method for confirming the protrusion of a wedge body of a civil engineering pile according to the present invention.
First, the leading pile body 2A including the wedge bodies 6 and 6 is driven into the soil (step S11). When the driving to the required depth is completed, the core body 5A is pressed by other parts or other members prepared for the civil engineering pile 1 to move the core body 5A downward, and the wedge body 6 , 6 are protruded into the soil, and the roots are stretched (step S12). Then, the guide member 12 is inserted from the opened upper side of the leading pile body 2A, and the thin plate 25 having the strain gauge 20 is inserted into the passages 14 and 14 of the guide member 12 until reaching the wedge body 6 (step S13). The strain generated at that time is detected by the strain gauge 20 and measured (step S14). As shown in FIG. 16, in the wedge bodies 6 and 6 having hollow portions 6d and 6d formed therein, the thin plate 25 is inserted so as to advance in the hollow portions 6d and 6d. Then, by checking the numerical value measured by the strain gauge 20, it is determined whether or not the wedge bodies 6, 6 are reliably projected into the soil (step S15). By repeating the above operation for each of the passages 14 and 14, the protruding state of the wedge bodies 6 and 6 can be confirmed. Of course, a plurality of thin plates 25 having strain gauges 20 may be simultaneously inserted into the passages 14 and 14 to detect strain simultaneously.

  As mentioned above, according to the wedge body protrusion confirmation method for a civil engineering pile according to the present invention, it can be easily determined whether or not the wedge body has been correctly constructed because it can be determined whether or not the wedge body has been reliably protruded into the soil. be able to. Also, if it is determined that the wedge body does not protrude, it is possible to take immediate action.

It is a perspective view of one embodiment of a pile for civil engineering work according to the present invention. It is a perspective view of the pile for civil engineering before a wedge body protrudes. It is a longitudinal section of a pile for civil engineering work. It is a perspective view of the core body for leading pile bodies. It is a perspective view of the core body for joint pile bodies. It is a perspective view of a pocket metal fitting. It is a cross-sectional view of a wedge body with a strain gauge. It is a schematic plan view of a strain gauge. (A), (b) is a cross-sectional view in different embodiment of the wedge body provided with the space part which incorporates a strain gauge. It is a transverse cross section in other embodiments of a wedge object which built a strain gauge. It is a cross-sectional view in still another embodiment of a wedge body provided with a space portion in which a strain gauge is housed. It is a flowchart in one Embodiment of the wedge body protrusion confirmation method of the pile for civil engineering works which concerns on this invention. It is sectional drawing of the leading pile body in the state by which the guide member was inserted. It is a perspective view of a guide member. It is a cross-sectional view of a guide member. It is a cross-sectional view of the leading pile body which shows the hollow part of a wedge body. It is a perspective view which shows the attachment to the core body of a wedge body. It is a perspective view of the thin plate provided with the strain gauge. It is a flowchart in other embodiment of the wedge body protrusion confirmation method of the pile for civil engineering works which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pile for civil engineering 2A Lead pile body 2B Joint pile body 3 Connection part 4 Opening part 5A, 5B Core body 6 Wedge body 6a Outer plate 6b Inner plate 6c Steel pipe 6d Hollow part 7 Medium hit body 8 Pocket metal fitting 9 Cut surface 10 Notch 12 Guide member 14 Passage 15 Handle 20 Strain gauge 21 Code 25 Thin plate

Claims (9)

In a civil engineering pile that drives a plurality of wedge bodies built in a hollow pile body to project outside the pile body so as to stretch the root in the soil,
A pile for civil engineering, wherein a strain gauge is attached to the wedge body. In the civil engineering pile according to claim 1,
The wedge body is a civil engineering pile characterized in that an intermediate layer is provided between two plate members and bonded together to form a space portion therein, and a strain gauge is built in the space portion. In the civil engineering pile according to claim 1,
The wedge body is a civil engineering pile characterized in that a space part is formed inside by sticking a plate member having a recess on at least one side, and a strain gauge is internally provided in the space part. In the civil engineering pile according to claim 1,
The wedge body has a recess at a predetermined location, and a strain gauge is attached to the recess. In the civil engineering pile according to claim 1,
The wedge body is formed by crushing a metal tube having a hollow portion from both sides so that the space portion is held therein, and a civil gauge is provided with a strain gauge in the space portion. Pile. In a civil engineering pile that drives a plurality of wedge bodies built in a hollow pile body to project outside the pile body so as to stretch the root in the soil,
A pile for civil engineering, characterized in that guide means for guiding a strain gauge attached to a flexible metal thin plate to the wedge body is formed so as to be inserted into the pile body. In the civil engineering pile according to claim 6,
The wedge pile is formed with a hollow portion for guiding the strain gauge inserted into the pile body into the wedge body. In the method for confirming the protrusion of a wedge body for a civil engineering construction projecting a plurality of wedge bodies built in a hollow pile body to the outside of the pile body and driving it so as to stretch the root in the soil,
A wedge body protrusion confirmation method characterized by attaching a strain gauge to the wedge body and measuring the strain generated when the wedge body protrudes into the soil to confirm that the wedge body has been driven into the soil. . In the method for confirming the protrusion of a wedge body for a civil engineering construction projecting a plurality of wedge bodies built in a hollow pile body to the outside of the pile body and driving it so as to stretch the root in the soil,
Driving the pile body with the wedge body into the soil;
Projecting the wedge body from the pile body driven into the soil, and
Inserting a strain gauge attached to a flexible metal thin plate into the pile body and guiding it to the wedge body; and
Confirming that the wedge body has been driven into the soil by measuring strain when the strain gauge is inserted;
A wedge body protrusion confirmation method comprising:

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