JP2006336239A - Method for controlling degree of verticality of pc hollow pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the degree of verticality of a PC hollow pile, which enables the degree of verticality of the PC hollow pile to be controlled by erecting the PC hollow pile with high degree of accuracy in a planned position, while keeping the degree of the verticality of the PC hollow pile within a range of a specified value. <P>SOLUTION: In this method for controlling the degree of the verticality of the PC hollow pile, when an upper end of the PC hollow pile 2 is fixed by supporting means 14 and 18 which are provided on the earth's surface so that the hollow pile can be erected in a suspended state in an excavated ditch 4, one end of a measurement string 30 is fixedly attached to a locking rod 12, which is provided in the lower part of the PC hollow pile through its axial core part, in such a manner as to be pre-positioned in its axial core part, and the other end thereof is precedently led out upward from the upper end. After the erection of the PC hollow pile, a tower-shaped measurement platform 34 is installed above the PC hollow pile; the other end of the measurement string is fixedly attached to the measurement platform and provided in a stretched state; and the fixedly attached position of the end on the side of the measurement platform is adjusted so that the measurement string can be set vertical while collimation is performed from two directions by a transit 36. After the completion of positioning, a displacement between the axial core position of the upper end of the PC hollow pile and the measurement string is measured, and the degree of the verticality is controlled by correcting the fixed position of the upper end of the PC hollow pile so that the displacement can fall within the range of the specific value. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for managing the verticality of a PC hollow pile standing in a suspended state in an excavated groove.

  In recent years, when building a temporary earth retaining wall or a side wall of a main underground structure, as shown in the following Patent Documents 1 to 3, PC hollow piles are continuously embedded in a row in the ground Thus, a method of forming the wall body has been frequently used.

  In other words, this method is constructed using a PC hollow pile that has been pre-stressed at a factory or the like and manufactured with high strength and high precision and has a square cross section. It is formed over the entire length in a columnar shape along the core and serves as an auger screw insertion hole. That is, the PC hollow pile is inserted into the hollow portion with the auger screw inserted and lifted to a predetermined erected position, and the ground immediately below the tip portion is press-fitted while continuously excavating and discharging with the auger screw. It is set in the ground.

Then, the PC hollow piles that have been laid down in advance are used as guides and adjacent to each other, and new PC hollow piles are laid down one after another in the same manner, and in the gaps (joints) between the PC hollow piles. Is a method of building a wall body in which these PC hollow piles are continuously embedded by filling mortar. When each PC hollow pile is completed, the head of the pile is sequentially coupled to the PC hollow pile embedded next to it by a connecting plate or the like. Further, if necessary, cement milk is injected at the time of completion of the setting and the tip is solidified to secure the supporting force.
Japanese Patent Laid-Open No. 10-46618 Japanese Patent Laid-Open No. 11-36296 JP-A-11-36334

  However, with the conventional construction method described above, since the auger screw inserted in the center of the PC hollow pile is pressed and excavated while being excavated, it is adjacent to the already-set PC hollow pile and used as a guide for the new PC. Even if hollow piles are laid, the lower end side of the new PC hollow pile tends to be inserted into the ground at an angle away from the previously placed PC hollow pile. It was difficult to keep the error of the generated gap within a specified value and to stand vertically. And since it was sunk in the ground, the state at the front-end | tip part side of a PC hollow pile was not visible at all until the time of root cutting, and there existed a subject that there was no way to measure and confirm the perpendicularity. Therefore, the completed shape of the wall was unknown until the time of root cutting, and joint opening (opening between PC hollow piles) and overall inclination occurred, and the completed shape was sometimes insufficient. In other words, it is difficult to set each PC hollow pile vertically exactly at a desired position as planned, and the length of the wall body constructed with a predetermined number of PC hollow piles may be longer than the desired dimension. there were.

  This invention is made | formed in view of the said situation, The objective is keeping the vertical degree of PC hollow pile within a regulation value, and the vertical of PC hollow pile which can be set and managed with high precision at a plan position. It is to provide a degree management method.

  In order to achieve the above object, in the vertical degree management method for a PC hollow pile according to claim 1 of the present invention, the upper end of the PC hollow pile is fixed by a support means provided on the ground surface, and the inside of the excavated groove When standing in the suspended state, the locking rod provided through the shaft core part at the bottom of the PC hollow pile is placed in advance on the shaft core part, and one end of the measuring thread is fastened to the other The end is led upward from the upper end, and after setting up the PC hollow pile, a hook-shaped measuring table is installed above the PC hollow pile, and the other end of the measuring yarn is fixed to the measuring table. And adjusting the fixing position of the end on the measurement table side so that the measurement thread is vertical while collimating the measurement thread from two directions, and after completion of the position adjustment, Measure the displacement between the axial center position of the upper end of the PC hollow pile and the measurement yarn, and adjust the displacement in the PC so that the displacement is within a specified value. Wherein the managing verticality by modifying the fixing position of the pile top end.

  Here, as shown in claim 2, the PC hollow pile is formed in a square cross-section in which a wall body is constructed by being continuously arranged in a row adjacent to a groove excavated over a predetermined length. It can be set as the structure which is a PC hollow pile for wall construction.

  Further, as shown in claim 3, the PC hollow pile is provided with engaging means for engaging the PC hollow piles disposed adjacent to each other to regulate mutual separation dimensions at the lower part. You can get none. Further, as shown in claim 4, one of the engaging means is a rod provided to protrude outwardly on the surface of the PC hollow pile on the wall surface forming side, and the other of the engaging means is A configuration comprising hook-shaped hooks protruding outward from the continuous side surface and provided along the wall surface forming side surface so as to be able to engage with the rod of the PC hollow pile arranged adjacently in advance. You can get none.

  According to the PC hollow pile verticality management method according to the present invention as described above, a locking rod that passes through the shaft core is provided at the lower portion of the PC hollow pile, and one end of the measurement yarn is previously placed at the shaft core position. At the same time, the other end of the measurement yarn is led out from the upper end, and after standing up, a measuring stand is provided above it, and the other end of the measuring yarn is stretched vertically on the measuring stand and fastened. Since the support fixing position on the upper end side is corrected so that the axis of the PC hollow pile coincides with the measurement thread, it is possible to stand up while managing the vertical degree of the PC hollow with high accuracy.

  EMBODIMENT OF THE INVENTION Below, suitable one Embodiment of the construction method of the wall body using the PC hollow pile for wall body construction which concerns on this invention and the said PC hollow pile is described in full detail based on an accompanying drawing.

  FIG. 1 is a plan view showing a water storage tank 3 as a wall structure using a PC hollow pile 2. 2 to 7 are diagrams for explaining various work processes, FIG. 2 is an excavation process, FIG. 3 is a protective member removal process, FIG. 4 is a temporary receiving process in the first half of the setting of the PC hollow pile, FIG. FIG. 6 shows an accuracy control process in the latter half of the PC hollow pile when standing, and FIG. 7 shows a protective member standing process.

  First, the PC hollow pile 2 for wall construction will be described. As shown in FIGS. 1 to 5, the PC hollow pile 2 has a wall body 6 in which a large number are adjacently arranged in a row in the insertion groove 4 excavated along the wall body construction line. Basically, it is a precast / prestressed / concrete product that is prestressed and manufactured with high strength and high precision in a factory or the like, similar to conventional PC hollow piles. That is, a groove portion for filling a water-stopping material is provided on the point that the through hole 8 is formed in the central core portion and the cross section is formed in a substantially square shape, and the continuous side surface 2a that is disposed adjacent to each other and joined to each other. The point etc. where 2c is formed are the same as that of the conventional PC hollow pile.

  Here, the PC hollow pile 2 of the present invention is different from the conventional one in that the engagement means 10 for engaging the PC hollow piles 2 and 2 arranged adjacent to each other and regulating their mutual separation dimension. As a locking tool for fixing and locking one end of the measurement yarn used for measuring the standing accuracy, the locking rod 12 that traverses the shaft core portion of the PC hollow pile 2 is provided. Unlike the conventional method, the through hole 8 is not inserted into the auger screw and used for excavation / soil removal.

  For example, as shown in the figure, the engaging means 10 may be configured such that one engaging piece is a hook-like hook 10a and the other engaging piece is an engaging rod 10b with which the hook 10a is engaged. The engaging rod 10b is integrally provided on the wall surface forming side surface 2b of the PC hollow pile 2 so as to protrude outward from the wall, and the hook 10a is adjacent to the PC hollow pile 2 disposed adjacently. It is provided along the wall surface forming side surface 2b so as to be engageable with the mating rod 10b from above, and is provided integrally so as to protrude outward from the connecting side surface 2a.

  Further, a PC hollow pile hanging bracket for hanging and supporting the PC hollow pile 2 in the insertion groove 4 by positioning the upper end of the PC hollow pile 2 downward at a predetermined depth from the ground surface. 14 is provided so that the hanging metal fitting 14 is coupled to the pile head of the PC hollow pile 2 by a long bolt and supported by being suspended from the ground surface when standing in the insertion groove 4. It has become. This PC hollow pile hanging bracket 14 has the same cross-sectional shape as the PC hollow pile 2 and has a through hole 16, and the upper end of the PC hollow pile hanging bracket 14 crosses the insertion groove 4 along the both sides of the insertion groove 4. A guide metal 18 that is fixedly locked at both ends is attached to a guide wall.

  Next, the procedure of the method of constructing the wall body 6 using the PC hollow pile 2 configured as described above will be described by taking the case of constructing a rectangular water tank as shown in FIG. 1 as an example. That is, in the method of constructing the wall body, as shown in FIGS. 1 to 7, an engagement means 10 is provided that engages the PC hollow piles 2 and 2 arranged adjacent to each other and regulates the mutual separation dimension. PC hollow piles 2 for building a wall body having a substantially square cross section are arranged in a row in the ground, and a wall body 6 of a predetermined length is extended stepwise. It has the excavation process, the standing-up process, and the solidification process described below, and is based on obtaining the wall body 6 of desired length by repeating these processes sequentially, and the specific procedure is as follows. Detailed description.

《Drilling process》
As shown in FIG. 2, first, the insertion groove 4 of the PC hollow pile 2 is excavated along a wall construction line over a predetermined length (for example, about 5 m). This excavation is performed by using a kelly excavator 20 or the like, and is operated by digging into the soil while pressing the grab 22, and during the excavation, the self-hardening stabilizing liquid 24 is always filled in the groove, and the wall of the excavation groove is collapsed. To prevent. This self-hardening stabilizing liquid 24 is prepared by mixing cement, bentonite, water, an appropriate amount of a retarding material, a dispersing material, and the like, and is solidified (set to a predetermined strength and water-stopping property over time). Self-hardening stable liquid cured body).

  Here, FIG. 2 shows a case in which the wall body 6 is extended and constructed continuously to the end portion of the already constructed wall body 6 after the fixing process is completed. Is provided with a protective member 26 so as to cover the continuous surface 2a of the PC hollow pile 2 at its end. In other words, the protective member 26 prevents the solidified material (self-hardening stable liquid cured body) from adhering to the continuous surface 2a, and the continuous connection of the PC hollow pile 2 with the grab 22 during groove cutting by the kelly excavator 20. This is to prevent the surface 2a from being damaged. Further, a scraper 28 is attached to the grab 22, and the solidified material adhered and solidified to the outer surface of the protective member 26 is scraped off by the scraper 28.

<< Protection member extraction process >>
When the excavation process is completed and the insertion groove 4 is formed, the protective member 26 is excavated with the jack 31 provided at the upper end of the PC hollow pile 2 at the end of the already constructed wall 6 as shown in FIG. By pushing down to the insertion groove 4 side, the protection member 26 and the solidified material (self-hardening stable liquid cured body) 24a of the already constructed wall body 6 are cut off. Next, the protective member 26 is pushed up by a push-up jack to completely cut off the adhesion between the protective member 26 and the solidified material 24a, and finally the protective member 26 is pulled upward by a crane.

<< PC hollow pile setting process (1) (temporary receiving process) >>
When the protection member 26 has been pulled out, the PC hollow pile 2 raised by the crane is inserted into the excavated insertion groove 4 as shown in FIG. At this time, the hook 10a and the engagement rod 10b of the engaging means 10 are integrally attached to the both surfaces 2b on the wall surface forming side in advance at the bottom of the PC hollow pile 2. This attachment is performed by welding or the like on a metal fitting that is embedded in the lower end portion in advance when the PC hollow pile 2 is created. Furthermore, a locking rod 12 for fixing and locking one end of a measuring thread used for measuring the standing accuracy is attached to the bottom of the PC hollow pile 2 and the absolute position confirmation is performed on the locking rod 12. A fishing line 30 is provided in advance as a measuring thread for use by binding and locking one end thereof. Here, one end of the fishing line 30 is bound to the axial center position of the PC hollow pile 2 in the center of the locking rod 12, and the other end is led to the outside from the upper end portion of the through hole 8.

  When the PC hollow pile 2 is stood up, the both-side hooks 10a are brought into sliding contact with the wall-forming side surface 2b of the PC hollow pile 2 arranged in advance, and are engaged so as to sandwich the both sides. The PC hollow pile 2 arranged in advance is suspended while being used as a guide. Then, a temporary metal fitting 32 extending in the transverse direction of the insertion groove 4 is attached to the upper portion of the PC hollow pile 2 with bolts, and the temporary metal fitting 32 is used as a support means with guide walls provided on both sides of the insertion groove 4 as a supporting means. The PC hollow pile 2 is temporarily received from the ground surface by being locked up.

<< PC hollow pile setup process (2) (main receiving process) >>
If the PC hollow pile 2 is temporarily received, then as shown in FIG. 5, the PC hollow pile hanging bracket 14 is lifted by a crane, and is superposed on the upper portion of the PC hollow pile 2 that has been temporarily received. The PC hollow pile hanging bracket 14 and the PC hollow pile 2 are joined with a bolt. This PC hollow pile hanging metal fitting 14 is formed in the same cross-sectional shape as the PC hollow pile 2, and the fishing line for confirming the absolute position led to the outside from the upper end portion of the through hole 8 of the PC hollow pile 2. Prior to the coupling, 30 is inserted through the through-hole 16 of the PC hollow pile hanging bracket 14 and led out from its upper end.

  Next, the bolt of the temporary metal fitting 32 is removed, and the temporary metal fitting 32 is removed. Thereafter, the integrated PC hollow pile 2 and the PC hollow pile hanging bracket 14 are gradually suspended by a crane, and the engagement rod 10b of the PC hollow pile 2 installed in advance at the end of the existing wall body 6 is attached. The hook 10a of the PC hollow pile 2 to be installed downstream is engaged and engaged. Then, the metal support 18 provided on the upper part of the PC hollow pile hanging bracket 14 is locked and fixed on the guide walls provided on both sides of the insertion groove 4, and the PC hollow pile 2 is inserted from the ground surface into the insertion groove. 4 in a suspended state.

<< Standing process of PC hollow pile (3) (Accuracy control process) >>
A saddle-shaped measuring table 34 is installed above the upright PC hollow pile hanging metal fitting 14, and a fishing line 30 for confirming the absolute position guided to the outside from the upper end of the through hole 16 is fixed to the measuring table 34. Apply tension. Note that an insertion hole 18 a for the fishing line 30 is also formed in the receiver 18. Then, in a state where the fishing line 30 is tensioned and stretched, the fishing line 30 is collimated by the transit 36 from two directions, and the end of the measuring table 34 side is stopped so that the fishing line 30 becomes vertical. Adjust the landing position. After completion of this position adjustment, whether or not the axial center of the PC hollow pile hanging bracket 14 coincides with the fishing line 30 inserted vertically in the through hole at the displacement measurement point on the PC hollow pile hanging bracket 14. Is measured from two directions to confirm the absolute position. Here, if the deviation between the shaft core and the fishing line 30 is not within the allowable range, the fixing position of the main bracket 18 supporting the PC hollow pile hanging bracket 14 on the guide wall is corrected, and the PC hollow pile is fixed. The deviation between the axial center of No. 2 and the fishing line 30 of the measurement line is set within a specified value. Further, if the deviation is large, the hook 10a of the PC hollow pile 2 that has been installed downstream may not be properly meshed with the engagement rod 10b of the PC hollow pile 2 that has been previously installed. The hollow pile 2 and the PC hollow pile hanging metal fitting 14 are lifted, the main receiving process is performed again, the hook 10a is correctly engaged with the engagement rod 10b, and the verticality is adjusted again. Then, if it is confirmed that the deviation between the shaft core and the fishing line 30 is within the allowable range, the PC hollow piles 2 are set up one after another and the verticality management is performed one after another, and a predetermined number of PC hollows are formed. Pile 2 will be installed sequentially.

《Protective member setting process》
Once the predetermined number of PC hollow piles 2 have been set up, the PC hollow pile 2 installed at the terminal end of the PC hollow pile 2 is in close contact with the unconnected continuous side surface 2a to cover the entire length thereof. A protective member 26 is provided.

  The protection member 26 is made of steel, and includes a stiffening plate 26a for maintaining strength, a cover member 26b that is attached to the stiffening plate 26a and is in close contact with the unconnected continuous side surface, and a lower portion of the stiffening plate 26a. And a hook 26c that meshes with the engagement rod 10b of the PC hollow pile 2. The length of the stiffening plate 26 a is equal to or greater than the depth of the insertion groove 4, and the tip of the stiffening plate 26 a is the groove of the insertion groove 4 in a state where the hook 26 c is engaged with the engagement rod 10 b of the PC hollow pile 2. It comes in pressure contact with the bottom. Further, the width of the stiffening plate 26a is substantially equal to the width of the insertion groove 4, and when the protective member 26 is stood in the insertion groove 4 along the terminal PC hollow pile 2, the stiffening plate 26a is The insertion groove 4 is separated into the PC hollow pile installation side and the groove surplus portion, and the self-hardening stabilizing liquid 24 filled in the groove surplus portion side is cut off from the PC hollow pile installation side. The cover member 26b has a U-shaped cross section with both sides standing up, and is provided from the upper part of the hook 26c to almost the upper end part. The distance between the standing pieces 26d on both sides coincides with the thickness of the PC hollow pile 2. It is slidably fitted to the wall surface forming side surface 2b. The protruding length of the upright piece 26d matches the protruding amount of the hook 26c.

  The protective member 26 is suspended by a crane and stood in the insertion groove 4. That is, the lower hook 26c is lowered along the PC hollow pile 2 with the standing pieces 26d on both sides of the cover member 26b fitted to the PC hollow pile 2 so that the lower hook 26c is engaged with the engagement rod 10b of the PC hollow pile 2. The cover member 26b is brought into close contact with the continuous surface 2a on the non-continuous side of the PC hollow pile 2 by temporarily fixing the upper end side to the self-hardening stabilizing liquid 24 on the continuous surface 2a. Is prevented from adhering and solidifying.

<< Fixing process >>
When the standing of the protective member 26 is completed, the device is left in a state of waiting until a predetermined time elapses until the self-hardening stabilizing liquid 24 is solidified. Then, if the self-hardening stabilizing liquid 24 is solidified after elapse of a predetermined time, the predetermined number of the PC hollow piles 2 connected are surrounded by a solidifying material (self-hardening stable liquid solidified body) 24a and fixed in the ground. The long wall 6 is newly extended. Moreover, the said solidification material 24a forms a water stop layer in the inner and outer sides of the PC hollow pile 2 provided continuously. Furthermore, since the self-hardening stabilizing liquid 24 has also entered the gaps between the PC hollow piles 2 and the grooves 2c for filling the water-stopping material, the wall body 6 having extremely good water-stopping properties is formed to be extended. It will be.

  And if the said fixing process is complete | finished and extension of the wall body 6 of predetermined length is completed, it repeats the above-mentioned excavation process-fixing process sequentially, and extends the wall body 6 one by one. The wall 6 having a desired length is constructed.

  Therefore, in the PC hollow pile 2 for wall construction constructed as described above and the wall construction method using the PC hollow pile 2, the inside of the insertion groove 4 excavated along the wall construction line In order to construct the wall body 6 by sequentially arranging the PC hollow piles 2 adjacent to each other in a row, the hooks 10a of the engaging means 10 provided at the lower portions of the adjacent PC hollow piles 2 and 2 are provided. And the engagement rod 10b are engaged with each other to regulate the distance between the PC hollow piles 2 and 2, so that an error in the gap generated between the PC hollow piles 2 and 2 is maintained within a specified value. It is possible to stand up easily while maintaining a high separation dimension accuracy.

  In addition, a locking rod that passes through the shaft core is provided at the lower portion of the PC hollow pile 2, and one end of the fishing line 30 of the measurement line is fixed to the shaft core position in advance, and the other end of the fishing line 30 is passed through the through hole 8. It is led out from the upper end, and after standing up, a measuring stand 34 is provided above it, and the other end of the fishing line 30 is stretched vertically to the measuring stand 34 and fixed, and the PC hollow pile 2 is attached to the fishing line 30. Since the verticality of the PC hollow 2 is managed by correcting the support fixing position on the upper end side so that the axes coincide with each other, the vertical of each PC hollow pile 2 before the self-hardening stabilizing liquid 24 is solidified. It is possible to stand up while managing the degree with high accuracy.

  For this reason, each PC hollow pile 2 and 2 can be stood correctly in the planned desired position, and the length of the wall body 6 constructed by connecting a predetermined number of PC hollow piles 2 in series is the desired dimension. Can be prevented from becoming longer. For this reason, even when a rectangular water tank is constructed, the PC hollow pile 2 is accurately stood in the connecting portion of both the wall portions 6 of the horizontal wall portion 6A and the vertical wall portion 6B. Bonding can be performed easily and simply.

  Further, the engaging means 10 is engaged from above with an engaging rod 10b provided projecting outwardly on the wall-forming side surface 2b of the PC hollow pile 2 and an engaging rod 10b of the PC hollow pile 2 disposed in advance. By using a hook-like hook 10a that is provided along the wall-forming side surface 2b and protrudes outward from the connecting side surface 2a, the PC hollow pile 2 arranged in advance is used as a guide. Each of the PC hollow piles 2 can be stowed in sequence by easily engaging the engaging means 10 while suspending the PC hollow piles 2 arranged along the way. Simplification can be achieved.

  Further, after inserting a predetermined number of PC hollow piles 2 into the insertion grooves 4 excavated to a predetermined length and fixing them with the solidification material 24, the solidification process is repeated again from the excavation process, thereby making the long wall 6 However, it can be easily extended and constructed step by step.

  In addition, after the solidification process is completed and the wall body 6 having a predetermined length is constructed, when a new wall body is further extended, the PC hollow pile 2 installed at the end of the constructed wall body 6 is not yet installed. Since the protective member 26 provided in close contact with the continuous side surface 2a is removed by being pushed down toward the insertion groove 4 side after excavation, the wall member is removed during the excavation. 6 can prevent not only the non-continuous continuous side surface 2a of the PC hollow pile 2 installed at the end of 6 from being scratched, but also prevent the solidified material 24a from adhering to the continuous side surface 2a. Thus, the beautiful continuous side surface 2a can be easily exposed.

  In addition, since the cover member 26a has a U-shaped cross section, and the standing pieces 26d on both sides thereof are in contact with the wall surface forming side surface 2b of the PC hollow pile 2 previously installed, when the protection member 26 is peeled off, Since the insertion groove portion through which the hook 10a of the engaging means 10 of the PC hollow pile 2 installed downstream is inserted by the standing piece 26d is formed, it is connected to the PC hollow pile 2 at the end of the wall body where the continuous side surface 2a is exposed. Therefore, it is possible to easily continue the upsetting process of a new PC hollow pile without performing a wasteful work of peeling off and removing the solidified material 24a, thereby improving work efficiency.

  Moreover, by using the self-hardening stabilizing liquid 24 for the solidifying material 24a, the self-hardening stabilizing liquid 24 can be filled in the insertion groove 4 in advance prior to the setting of the PC hollow pile after the excavation process. The PC hollow piles are sequentially put into the insertion groove 4 filled with the self-hardening stabilizing liquid 24, so that the self-hardening stabilizing liquid 24 can be easily passed around and solidified between the PC hollow piles. Therefore, it is possible to secure good water stoppage while reducing labor related to the water stop work.

It is a top view which shows the water storage tank as a wall body structure using the PC hollow pile concerning this invention. It shows an excavation process, (a) is a plan view, (b) is a front view. The protection member removal process is shown, (a) is a top view, (b) is a front view. It is. The temporary receiving process of the first half at the time of standing of a PC hollow pile is shown, (a) is a top view, (b) is a front view. The main receiving process at the time of standing of a PC hollow pile is shown, (a) is a top view, (b) is a front view. The accuracy control process of the latter half at the time of standing of a PC hollow pile is shown, (a) is a top view, (b) is a front view. The protection member standing up process is shown, (a) is a top view, (b) is a front view.

Explanation of symbols

2 PC hollow pile 4 Insertion groove 6 Wall body 8 Through hole 10 Engagement means 10a Hook 10b Engagement rod 12 Locking rod 14 PC hollow pile hanging bracket 16 Through hole 18 Receiving hardware 20 Kelly excavator 22 Grab 24 Self-hardening stability Liquid 24a Solidified material (self-hardening stable liquid solidified body) 26 Protection member 26a Stiffening plate 26b Cover member 26c Hook 26d Standing piece 28 Scraper 30 Fishing line (measurement line)
32 Temporary metal fittings 34 Measuring table 36 Transit

Claims (4)

It is a method of managing the vertical degree of the PC hollow pile when the upper end of the PC hollow pile is fixed by the support means provided on the ground surface and standing in a suspended state in the excavated groove,
A locking rod provided in the lower part of the PC hollow pile through the shaft core part is positioned in advance on the shaft core part, one end of the measuring thread is fastened, and the other end is led upward from the upper end part. ,
After setting up the PC hollow pile, install a hook-shaped measurement table above the PC hollow pile, and fix the other end of the measurement yarn to the measurement table and stretch it.
Adjusting the fastening position of the end on the measurement table side so that the measurement yarn is vertical while collimating the measurement yarn from two directions,
After completion of the position adjustment, the displacement between the axial center position of the upper end portion of the PC hollow pile and the measurement yarn is measured, and the fixed position of the upper end portion of the PC hollow pile is adjusted so that the displacement is within a specified value. The verticality management method of PC hollow pile characterized by correcting verticality and managing verticality.   The PC hollow pile is a PC hollow pile for building a wall body having a square cross section that is adjacent to a groove excavated over a predetermined length and continuously arranged in a row to form a wall body. The vertical degree management method of the PC hollow pile of Claim 1 characterized by these.   3. The PC according to claim 2, wherein the PC hollow pile is provided with engaging means for engaging the PC hollow piles arranged adjacent to each other to regulate the distance between the PC hollow piles. Vertical pile management method for hollow piles. One of the engaging means is a rod that protrudes outwardly on the wall-forming surface of the PC hollow pile, and the other of the engaging means is adjacent to the PC hollow. 4. The PC according to claim 3, comprising a hook-like hook that protrudes outward from the continuous side surface and is provided along the wall surface forming side surface so as to be engageable with the rod of the pile from above. Vertical pile management method for hollow piles.

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