JP2010168879A - Reinforcement construction method of caisson type pile, and reinforcement unit body for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a reinforcement assembly that requires time, as a reinforcement unit body on the ground to attain safe and easy assembly while shortening a construction period. <P>SOLUTION: A reinforcement construction method for constructing the reinforcement assembly in a caisson type shaft comprises: connecting hoops annularly and arranging shear reinforcing bars radially in grated shape at the hoops to form a reinforcement block body, and supporting a plurality of stages of the reinforcement block bodies by ladder reinforcements to form and arrange the reinforcement unit body 1; transferring and lowering the reinforcement unit body 1 along guide bodies and binding or welding the reinforcement unit body 1 to the guide bodies; carrying out superimposed fixing to the respective ladder reinforcements of the reinforcement unit body 1 by the transfer and constructing a working scaffolding in sequence by following; arranging vertical main reinforcements after the reinforcement unit body 1 is constructed in the caisson type shaft; and binding or welding the vertical main reinforcements to the reinforcement unit body 1 to construct the reinforcement assembly. The reinforcement unit body 1 is transferred by a suspension support body 3 with a transfer tool body having support fittings for supporting the reinforcements, disposed at a hanging frame body 3a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

In the present invention, a reinforcing bar assembly of a deep foundation pile used for foundations such as bridges and transmission line towers is constituted by a reinforcing bar unit body, the reinforcing bar unit body is pre-assembled on the ground in advance, and a deep foundation pile is formed with a suspension support. The present invention relates to a reinforcing bar construction method for a deep pile and a reinforcing bar unit body which is constructed by transferring a suspended support and constructing a reinforcing bar assembly.

  Conventionally, a deep foundation pile foundation has been constructed as a foundation for constructing bridges, transmission line towers, etc., and the deep foundation pile foundation is first constructed by excavating a deep foundation shaft in the ground, and then a defense concrete such as earth retaining concrete or liner plate. A wall is formed, and then a working scaffold is constructed up to the ground, and in that state, a cylindrical reinforcing bar assembly is placed in the deep foundation shaft in blocks of a predetermined height (4.8 to 6.5 m or site conditions). Other heights are also selected)), and the foundation pile foundation is constructed by filling the shaft with concrete in the form of embedding the constructed rebar assembly in units of blocks. It is constructed to a predetermined height.

  The rebar assembly is constructed by setting up the above-mentioned working scaffold, setting up setup bars in the vertical direction along the wall surface of the shaft, and reinforcing bars in the circumferential direction and shear reinforcement bars in the grid pattern in the radial direction. Reinforcing bar laying or welding, and then placing the longitudinal main bars and repeating the construction of the reinforcing bars and placing concrete concretely in units of each block as described above, and deep foundation pile foundation in units of each block in the shaft Is generally constructed and constructed.

  Further, as a prior art, there is a “reinforcement unit for deep foundation piles and a construction method of deep foundation piles using the same”, and the construction method of the unit and deep foundation piles is an arc-shaped laterally arranged horizontally at a predetermined pitch. The outer reinforcing bar unit 10 and the inner reinforcing bar unit 11 in which the reinforcing bars 12 are connected by a plurality of vertical reinforcing bars 14 arranged at appropriate intervals are fixed to the outer vertical main bars 64 and the inner vertical main bars 70 and outside the truss structure. There is a method for constructing a deep foundation pile that is connected along the respective steps in the defense wall 40 using a deep foundation pile reinforcing bar unit in which a plurality of spacers 22 and inner spacers 24 are vertically attached. (For example, see Patent Document 1)

  Furthermore, there is a “rebar construction method by transfer and transfer of temporary assembly rebar unit” patented by the present applicant, which reinforces the temporary assembly rebar unit on a temporary assembly jig body in advance on the ground. The temporary assembly rebar unit is transferred from the temporary assembly jig body to the transfer jig body, and the fishing rod is transferred to the built-in position, and the temporary assembled rebar unit of the temporary assembly jig body is bound to the vertical reinforcement at the built-in position. Alternatively, there is a reinforcing bar construction method in which welding is performed and fixed. (For example, see Patent Document 2)

JP-A-8-218551 Japanese Patent No. 4150981

Reinforcement assemblies for conventional deep foundation pile foundations are constructed by constructing a working scaffold and then standing vertically with vertical main bars in consideration of the thickness of the outer periphery of the deep foundation shaft However, before this vertical main bar is erected, a setup line is erected at an important point, and a plurality of arc-shaped band bars are sequentially arranged on the set-up line to form an annular shape. The reinforcement is not supported. (It is noted that many installers are temporarily or temporarily fixing the setup reinforcement in the working scaffold until several stages of reinforcing bar blocks are constructed in this application. ) In addition, the support of the set-up bars is not supported by using the set-up bars instead because the construction of the shear reinforcement bars will be hindered if the longitudinal main bars are supported and fixed as described later in [0013]. and Haisuji multiple shear reinforcement in a lattice Rutotomoni radially to build, rebar assembly in a predetermined block unit Most of the work is carried out in the deep foundation shaft, and the work on the ground is limited to the work of dropping materials into the deep foundation shaft. challenges from the fact that there is, construction technology that is looking back to work on the ground has been demanded.

  And since the ring diameter of the rebar assembly constructed as described above becomes very large (described later), a steel strip having a required length is formed into an arc shape and a straight shear reinforcement bar is a deep foundation. Narrow work scaffolds in the shaft are constructed in a ring and lattice form, as will be described later, in order to bind or weld heavy rebars, it takes a lot of work and labor to bind or reinforce rebars. There was also a need to improve efficiency and to improve safety and physical fatigue, especially on a narrow work platform.

In addition, the construction of a conventional deep foundation pile foundation is built up in units of blocks of a predetermined height (4.8 to 6.8 m as a past example) from the above-mentioned reinforcing bar construction to concrete placement. removal and concreting of work platform that was used to construct, and then, also construction methods newly become embedded in pouring neat concrete methods or work platform to構設the work platform for the next stage block In any of the construction methods, work time or work scaffolding was wasted, and improvement was demanded.

  Furthermore, the construction of each block unit is to remove impurities on the solidified concrete surface by a latency process to increase the adhesion of the joint of the next concrete casting after solidification after solidification. For this reason, it takes time and labor to pump the wash water after the washing, such as pumping work, and the period of the latency treatment etc. takes about 5 days depending on the situation, and the number of times of construction in block units is It was a waste of staffing during the period, and improvements were required.

  In addition, the further problem of construction of deep foundation pile foundation in the block unit is to excavate deep foundation shafts in the ground to form concrete walls for earth retaining on the deep foundation bottom and side walls in the deep foundation shafts. The peripheral wall is not necessarily circular and the bottom surface is not formed flat, and there is distortion. In this state, the work scaffolding and the vertical streak are placed, and the stirrup is placed in a ring in the deep foundation shaft. Because it is constructed by tying or welding, whether the rebar assembly in the block unit is circular and keeps the horizontal level, the horizontal level of the rebar assembly is transited until a several level of rebar is built. It was difficult to measure accurately with such measuring instruments.

  Adjustment of the horizontal level is also complicated, especially when the diameter and weight are large, and in the first stage of building the above-mentioned reinforcing bar, a set-up bar (a reinforcing bar thinner than the longitudinal main bar to be originally built is used). )), And then arrange the longitudinal main bars, but the initial set-up bars are not particularly supported and the rebar assembly is built in an unstable state. When building up to the ground in an incomplete construction situation, an accident occurred in which the rebar assembly collapsed (Magazine, Nikkei Construction, December 2008 issue, pages 26 to 29, “Causes of accidents and measures to prevent recurrence, 29 ”)), but the report did not determine the cause, but it was pointed out that it was caused by buckling of the setup muscle or that the setup muscle was eccentric as the cause of the buckling Rebar assembly It becomes a big problem of the conventional construction method that can not accurately output the horizontal level at the low position, and the safety level also remains, the horizontal level can be easily adjusted and the horizontal level can be easily adjusted at the low position There was a need for what could be done.

  In addition, the above-mentioned problem is also a problem of the longitudinal main bar (used as a set-up bar in the above) itself, that is, in the construction of the vertical main bar and the arc-shaped band, It is constructed so as to be hung with hooks, but it is a problem to hang the hooks, and one hook can be easily hung on the vertical main bars with the thick vertical main bars standing vertically, but the hooked state If you try to hang the other hook, the bent part of that hook will be in the way, and it will not be hung on the vertical main bar unless it is bent so that both vertical main bars are bent closer to bypass the tip of the hook, It is usually 290 mm in length from the bent part of the hook to the tip. This means that the tip of the hook cannot be hooked on the vertical main muscle unless it bypasses 290 mm. Yong Can not be distorted, and if you try to hang on the last one place that is looped and looped one after another, the vertical main bars that are all hooked on the ring can no longer flex, When the hook does not pass through the longitudinal main bar and the longitudinal main bar of the conventional construction is arranged, both hooks of the strap are inserted from the upper end of the longitudinal main bar and sent below the predetermined position, Since the construction is made so that the hooks are applied to both the longitudinal main bars, it takes a lot of time and effort.

  As can be seen from the conventional construction of the above-mentioned band reinforcement, it is difficult to hook the band reinforcement on the vertical main bar or the set-up bar, and the vertical main bar or the set-up bar is not fixed and temporarily held on the work scaffold or swings. By making it possible, it is easy to lay the straps on the set-up bars, so the construction of the arc-shaped strips is time-consuming and time consuming, and the effort of the first stage of bar arrangement construction Improvements have been sought due to the complexity, the above-described horizontal level adjustment complexity, and the safety of the construction.

  Furthermore, rebar construction work in a conventional construction shaft is to continuously unload materials such as reinforced bars and shear reinforcement bars with a crane, etc., especially for the reinforced bars, hooks are hooked from the upper ends of both longitudinal main bars. Thus, it is necessary to insert and take down one by one very much, and look up from the bottom of the hole standing in a narrow work scaffold by repeating the work of tying or welding them to the setup and longitudinal main bars There are many work while balancing the body, using attention and physical strength, both the mind and body got very tired, and many people such as stiff shoulders have experienced safety problems due to fatigue, Workers often work in places with poor air environment in deep foundation shafts throughout the day, and improvements were required.

In addition, the work in the above-mentioned conventional method shafts is usually dangerous, and the fallen objects from above, for example, the fall of dust and pebbles due to the influence of wind, etc., and all materials are stored on the ground. Since they are constantly lowered, there is a relationship with scaffolding for work, etc., and there are cases where the escape area is limited and cannot be saved, and attention is required constantly including the ground side. In addition, it requires long-term work in deep shafts and requires ventilation equipment. These factors also lead to excessive fatigue, demand for improvements , and work in deep foundation shafts that are dangerous. to reduce as much as possible, in as much as possible reclassified it to work on the ground, working to shorten the dangerous work and efficiency of work, and that to ensure the reduction and safety of the work, also numerous described above, such as does not require ventilation equipment Challenges Resolution are intended to be achieved.

  Most of the above-mentioned deep foundation piles are 8m to 29m in diameter and about 19m in depth (other dimensions are selected depending on the site conditions). The vertical main bar has a D51 standard size weight of 15.9 kg / m, for example, a length of 12 m, a total weight of about 191 kg, and a size often used for band bars and shear reinforcement bars. D29 is 5.04kg / m, and the length is 12m, and the weight is about 60kg. The weight of such a heavy work is narrow in the deep foundation shaft as in the conventional construction method described above. Bonding or welding the reinforcing bars by hand manually left many problems in safety and work efficiency.

  In addition, “Reinforcement unit for deep foundation pile and method for constructing deep foundation pile using the same” in Patent Document 1 is to install an outer spacer 22 of truss structure on the defense wall 40 in the defense wall 40 of the deep foundation pile. Next, it is disclosed that the outer rebar unit 10 is hooked on the corrugated lattice 28 of the outer spacer 22, the outer rebar unit 10 is bundled, and then the inner spacer 24 is attached, and the assembly is sequentially performed. Each rebar is very heavy, and when it is unitized, the weight is excessive, it is not a unit that is reinforced and assembled to withstand that weight, so in handling and moving it, A jig or the like for moving with clay or the like is required, and it was not possible to simply lower the protective wall 40 as in the disclosed contents.

  That is, the disclosed reinforcing bar unit for deep foundation piles welds the outer reinforcing bar unit 10 and the inner reinforcing bar unit 11 in which the reinforcing bars are connected by the plurality of vertical reinforcing bars 14 arranged at appropriate intervals with the arc-shaped laterally arranged reinforcing bars 12. Although each stage is manufactured in a cylindrical shape with the structure (described in [0012] of Patent Document 1), as described above, the weight of the reinforcing bar used in the deep foundation pile is excessive, and as described above The unit with a three-dimensional structure is not stable in shape, and the shape cannot be maintained even when it is lowered into the defense wall 40, and there are many problems.

  Furthermore, “Rebar construction method by transfer and transfer of temporary assembly reinforcing bar unit” in Patent Document 2 temporarily mounts the temporary assembly reinforcing bar unit on the temporary assembly jig body, and transfers the temporary assembly reinforcing bar unit from the temporary assembly jig body. Since it is mounted on the jig body, transferred to the erection position and transferred to the vertical position of the erection position, the temporary assembly rebar unit of the temporary assembly jig body is bound and fixed to the vertical bar of the erection position. Since the longitudinal main bars are not installed in a fixed standing state, even if the temporary assembly rebar unit of Patent Document 2 is transferred as it is, it is possible to construct the reinforcing bar assembly by binding the unit to the vertical main bars. In addition, the temporary rebar unit cannot be separated from the transfer jig body until it is bound to a large number of the longitudinal main bars. Therefore, in the construction method of Patent Document 2, the construction speed and safety of the deep foundation shaft are increased. Because of this, the rebar unit is Reinforcement unit and fishing rod transfer concept of the reinforcing bar unit are similar, but there are many problems when the object to be constructed and its conditions are different, and it is not possible to cope with it at all. Improvement of the construction method of the deep foundation pile reinforcement was requested.

In order to effectively achieve the above-mentioned problems, the present invention provides, as a first solution, in a reinforcing bar construction method for constructing a reinforcing bar assembly in the deep foundation shaft, a ladder bar is previously positioned at a predetermined position on the ground. In addition, a required number of strips that are arc-shaped and hooks are formed on both ends are connected to the ladder support support bars in a ring shape, and shear reinforcement bars are radially arranged in a lattice pattern in the ring straps. Forming a reinforcing bar block body, and supporting the reinforcing bar block body to the support receiving bars of the ladder bars in a required number of steps to construct a reinforcing bar unit body;
A second step of transferring the rebar unit body of the required number of steps constructed to the deep foundation shaft with a suspension support,
A guide bar is erected along the wall surface of the deep foundation shaft and is supported from the wall surface by a guide bar supporting stab bar to form a guide body. A third step of transporting and dropping to a predetermined position in the deep foundation shaft,
The lowered rebar unit body is leveled and the guide body and the rebar unit body are bound or welded, and after the second stage, the first to third steps are repeated, and each ladder of the rebar unit body is repeated. A fourth step of welding the reinforcing bars in a straight line and connecting each step, and binding or welding the stacked reinforcing bar unit bodies to each guide body;
After the second stage, after connecting the rebar unit bodies together, a fifth step of sequentially constructing the work scaffold to the next lower stage,
After the reinforcing bar unit body is constructed, a reinforcing bar construction method in which the longitudinal main bar is disposed at each required position of the reinforcing bar unit body and the process of binding or welding the longitudinal main bar and the reinforcing bar unit body is the sixth process. so,
Reinforcement assemblies will be built in the deep foundation shaft by each process .

As a second solution, the stab bars for supporting the guide bars are embedded in the deep foundation wall surface and protruded by a predetermined amount from the wall surface, so that the rebar assembly constructed later can be accurately positioned at a predetermined position. The guide bars are configured as a guide body by supporting the guide bars at a predetermined distance from the wall surface, and the reinforcing bar unit is transported and lowered to a predetermined position in the deep shaft while using the guide bodies as guides. Reinforcement construction method to hold and fix the unit body in a predetermined position in the deep foundation shaft ,
Using the guide body as a guide, the rebar unit body is transported and lowered to a predetermined position in the deep foundation shaft and is held and fixed at the predetermined position .

Further, a third aspect of the invention, the reinforcing bar unit body, the support receiving muscle and ladder muscle provided the required number of stages in a predetermined interval and a hoop hook at both ends in the arc shape is formed, connecting annular shape In addition, a reinforcing bar block body in which shear reinforcing bars are formed in a grid pattern in the radial direction is made one stage, a plurality of the ladder bars are arranged at predetermined positions of the reinforcing bar block body, and each support receiving bar of the ladder bars and the reinforcing bar block body By binding or welding support ,
A rebar unit body is constructed with a rebar block body and transferred into a deep foundation shaft, and the rebar unit body is constructed by building up the rebar unit bodies in layers.

In the reinforcing bar construction method that constructs a reinforcing bar assembly in the deep foundation shaft that has been earthed by excavating a foundation deep shaft for foundation, so that the reinforcing bar unit body can be accurately formed on the ground beforehand, First, a required number of ladder bars are arranged in a predetermined position, and a required number of band bars that are arc-shaped and hooks are formed at both ends are connected to the support bars of the ladder bars in a required manner. In addition, a reinforcing bar block is formed by arranging shear reinforcement bars in a lattice pattern in the radial direction on the annular band, and the reinforcing bar block is horizontally arranged at a predetermined number of steps on the ladder bars. A first step of constructing as a predetermined reinforcing bar unit body by binding or welding support to the receiving bar;
A second step of suspending and transferring the constructed predetermined reinforcing bar unit body to a deep foundation shaft with a suspension support;
A third step of transporting and lowering the rebar unit body transported by the suspension support along the guide body to a predetermined position in the deep foundation shaft;
The transported and lowered first-stage rebar unit body is leveled at the bottom of the deep foundation shaft, and in this state, each guide body erected along the wall surface and the rebar unit body are bound or welded together. In the second and subsequent steps from the bottom surface, the first to third steps are repeated, and the ladder bars of the rebar unit body that are lowered and stacked are overlapped in stages so as to be linear. And a fourth step of binding or welding the rebar unit bodies connected to each stage in the same manner as described above,
After the second stage, after the ladder bars of the reinforcing bar unit body are overlaid and connected, the lower level of the reinforcing bar unit body is the next lower level in the grid-like predetermined space where the shear reinforcement bars are arranged in a grid pattern. Until the fifth step of constructing a work scaffold,
After the reinforcing bar unit body has been built in the deep foundation shaft, the longitudinal main bars are arranged at the required positions of the reinforcing bar unit body, and the longitudinal main bar and the reinforcing bar unit body are bound or welded. The first solving means for constructing the reinforcing bar assembly in the deep foundation shaft by the above steps ,
From the first step above, the reinforcing bar unit body is constructed on the ladder on the ground in each rebar block body, so the most time-consuming rebar unit body can be constructed on the ground, and there are many risk factors mentioned above. Work in the shaft can be greatly reduced, it is the best safety measure, and there is no need to unload many heavy materials each time with a crane as in the past, and all can be placed near the construction site, because it can better efficiency workability, Hakare is significantly reduced and cost reduction of the construction period rebar assembly, further, since the reinforcing bar unit body by tying or welding to form into a predetermined shape, the mold rather be shifted The suspension support can be transferred safely and quickly.

Also, from the second and third strokes, the rebar unit body can be suspended and transferred to the deep foundation shaft, and when it descends from the ground to the predetermined heavy load position in the deep foundation shaft, it can descend along the guide body In addition, it is easy to position and fix each reinforcing bar unit body in the deep foundation shaft, and the reinforcing bar unit body can be bound or welded to the guide body, so that each rebar assembly is not broken. Reinforcement unit can be loaded.

Furthermore, since it is lowered along the guide body when transporting and lowering to the predetermined position, it is not necessary to perform guidance work by an operator at the installation location in the shaft, so it is necessary to wait on the spot until the rebar unit body is lowered. Therefore, the rebar unit body can be safely lowered , so that the transfer and lowering operation of the rebar unit body can proceed safely and the time for the suspension support transfer can be shortened.

In addition, from the fourth stroke, the horizontal level adjustment can be adjusted as described above with the bottom of the deep foundation shaft and the connection body, so that the horizontal level is maintained and the rebar assembly is not destroyed, and it is accurately stable. The rebar assembly can be safely and quickly constructed.

Further, the fifth step, since the later sequentially構設than work platform rebar unit body, Rutoki is Tsu支transferred lowered into caisson shafts like clay from the ground, and work platform are in the way The descending rebar unit body does not become difficult to see, and while confirming, the descent and the operator can align without assistance in the deep foundation shaft, so the alignment can be done safely and the transfer descent work is progressing It leads to shortening of construction time.

And because the worker can always work in an easy posture below the line of sight , the burden on the arms and shoulders can be reduced, and welding that is fixed to each ladder of the reinforcing bar unit in the deep foundation shaft described later As described above, workability such as work can be performed in an easy posture below the line of sight even on an unstable work scaffold, and it is easy to balance the work posture, enabling safe and efficient work.

In addition, the workability such as welding that is fixed to each ladder bar of the reinforcing bar unit in the deep foundation shaft is different from the ground welding work, and it is a work place with a narrow danger called the work scaffold in the deep foundation shaft. It is especially important from the work at work, and the fact that work can be performed in an easy posture below the line of sight as described above means that the work posture is easily balanced and the worker's safety and fatigue are low, and the work environment is hygienic and safe. Can work efficiently.

Further, the sixth step, after the rebar unit body is constructed in the shinso vertical shaft, the longitudinal main reinforcement and reinforcement unit bodies since the tying or welding, laborious inserting from the upper end of the vertical main reinforcement as in the conventional There is no work, and there is no time-consuming process of repeating rebar construction and concrete placement for each block to prevent buckling collapse that may occur if the rebar is built up to the ground as described above. Construction is easy because it is completed by inserting the vertical main bar from the top of the assembly and binding or welding to the rebar assembly , and construction of the rebar can be completed to the ground at once, and construction is completed in a short time .

  For these reasons, many of the problems described above are eliminated, and most of the work of building reinforcing bars is transferred to the ground to minimize the work in the deep foundation shaft. It is safe and efficient due to the unification of work, so that construction can be done quickly. In order to verify this, when used for demonstration construction to construct a reinforcing bar assembly with a pile pile diameter of 14m and a depth of 19m on the construction scale, it is conventional. In the past results of the construction method, it takes an average of about 13 people / day, and it takes about 40 days of construction. However, in the method for constructing reinforcing bars for deep foundation piles of the present invention, the average is about 7 people / day. It could be completed in 11 days and once again proved the speed of the construction period.

Thus, the guide member is so constructed after the guide of the transfer drop Rebar unit body reinforcing bar assembly can be supported in precisely predetermined position, the guide muscle at a predetermined position location along the shinso pit wall peripheral surface On the other hand, a required number of stab bars for supporting the guide muscles are provided by being embedded in the wall surface and inserted in a predetermined amount from the wall surface to project the required number of stab bars for supporting each of the guide muscles. The reinforcing bar unit is welded and supported along the guide bar, and the rebar unit body is guided along the guide bar supported upright to the predetermined position in the deep foundation shaft. By the second solving means for holding and fixing at a predetermined position in the foundation shaft ,
When suspended and transported from the ground to the deep foundation shaft with clay, etc., it can be lowered along the guide body. Accordingly, the positioning of the reinforcing unit is facilitated, and the reinforcing bar unit bodies are bound or welded to the guide body, so that the reinforcing bar unit bodies can be mounted without causing the collapse of the reinforcing bar assembly.

In addition, since the reinforcing bar unit body is accurately constructed in the first step and the guide bar is accurately set up and supported by the guide bar supporting stab bars, the reinforcing bar assembly along the guide bars By constructing the structure, it is possible to accurately set the gabri without the need for labor, and this is because the deep foundation shaft formed by the above-mentioned conventional excavation and earth retaining work cannot be formed into an accurate cylindrical shape. It was very difficult and time consuming to accurately set the installation position and horizontal level, and it was possible to solve the problem that the construction period was delayed.

Thus, in a reinforcing bar unit body that constructs a reinforcing bar assembly in a deep foundation shaft, a ladder is provided with a predetermined number of rod-shaped support receiving bars protruding from one side surface of a supporting body such as a mold material of a predetermined length at a predetermined interval. A strip with a circular arc and hooks formed at both ends is connected to the required number of inner and outer double loops, and shear reinforcement bars are arranged radially in a grid pattern on the ring strips. A plurality of ladder bars are arranged at predetermined positions of the reinforcing bar block body and the shear reinforcement bars, and each support receiving bar of the ladder bars and the reinforcing bar block body are arranged in predetermined stages. By the third solution means for supporting the number of steps, bundling or welding ,
Since an accurate rebar unit body has been constructed in advance, it is possible to construct a rebar assembly accurately by overlapping connection of the rebar unit bodies, and there is also a gamble between the wall surface in the deep foundation shaft and the rebar assembly. Since it can be set accurately and the rebar unit body can be accurately loaded without distortion, buckling of the rebar assembly can be prevented, and the rebar assembly can be safely and quickly constructed, It will also reduce costs.

In addition, due to the ladder bars of the reinforcing bar unit body, there is no buckling collapse due to the use of conventional setup bars, and in order to prevent buckling collapse as in the past, the reinforcing bar assembly can be grounded at once without performing concrete placement for each block. Even if it is constructed up to, it will not collapse due to buckling, and the construction period can be shortened.

Further, since the connecting body is provided so that the ladder bars can be connected up and down, when constructing a reinforcing bar assembly by overlapping the ladder bars, the inclination when the ladder bars are mounted is determined by the thickness of the connecting body. Inclination can be adjusted by inserting a plate between them, or the first level of reinforcing bar construction in the deep foundation shaft, and the horizontal level adjustment is adjusted as described above with the bottom surface of the deep foundation shaft and the connecting body. It is possible to maintain a horizontal level and the rebar assembly does not collapse, and an accurate and stable rebar assembly can be constructed safely and quickly. Since the unit body can be quickly constructed with heavy equipment, heavy equipment construction is facilitated and the construction period can be shortened.
Therefore, the present invention has a remarkable effect in practice.

  It is a front fragmentary sectional view which shows the whole image of the Example of this invention.   It is a top view of a reinforcing bar unit body.   It is the perspective view which abbreviate | omitted the middle of both receiving ladder muscles.   It is the perspective view which abbreviate | omitted the middle of the one-sided ladder muscle.   It is a front view of the principal part which piled up both the receiving ladder bars of a reinforcing bar unit body.   It is a front view of the principal part which piled up the single-piece ladder ladder of the reinforcing bar unit body.   It is a whole top view which shows the attachment state which arrange | positions a suspension frame to a reinforcing bar unit body.   It is the perspective view which abbreviate | omitted the middle of the temporary assembly jig.   It is a front view of the principal part which shows the state which supports a reinforcing bar unit body with a suspension frame.   It is a side view of the principal part which shows the state which supported the reinforcing bar in the support fixture of the transfer jig body of a hanging frame.   It is a front fragmentary sectional view of the principal part which shows the state which suspends and conveys a reinforcing bar unit body and carries it over.   It is a top view of the principal part which arrange | positions a vertical main reinforcement in a reinforcing bar assembly, and shows an attachment state.

This is a reinforcing bar construction method for building a reinforcing bar assembly in a deep foundation shaft, in which circular bars and hooks with hooks on both ends are connected in a ring, and shear reinforcement bars are radially arranged on the band bars in a grid pattern. Reinforcing bar to form a reinforcing bar block, and the reinforcing bar block is bound or welded to each of a plurality of support receiving bars of the ladder, and a plurality of the reinforcing bars are arranged at required positions of the band reinforcing bars and the shear reinforcing bars. Is a first step that is pre-positioned and arranged;
Second and third strokes in which the rebar unit body is suspended and transferred by a suspension support body and is transported and lowered along the guide body on the wall surface in the deep foundation shaft, and the guide body and the rebar unit body are bound or welded . When,
Fourth and fifth steps of constructing work scaffolds sequentially after the rebar unit body is transported and fixed to each ladder bar of the rebar unit body by the transport descent ,
After the rebar unit body is built in the deep foundation shaft, the construction method of constructing the rebar assembly in the sixth process of placing the vertical main bar and binding or welding the vertical main bar and the rebar unit body,
Construction that constructs a rebar assembly by guiding the transport descent of the rebar unit body to guide and lowering it to a predetermined position and fixing it with a guide body that supports and guides the guide bar in the deep foundation shaft by the stab bars for supporting the guide bars Law and
To construct a reinforcing bar assembly, constructing a reinforcing bar block body having band bars and shear reinforcing bars with a reinforcing bar unit body bonded or welded to a ladder bar with a predetermined number of steps,
By building a rebar assembly that requires time into a rebar unit and building it on the ground, it can be assembled safely and easily, and the construction period can be shortened.

  An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a reinforcing bar unit body, and the reinforcing bar unit body 1 is suspended and transferred by a suspension support body 3 in a deep foundation shaft 2. It is transported and lowered along the guide bars 4 in the shaft 2 and built up from the bottom surface in the deep foundation shaft 2.

Therefore, the deep foundation shaft 2 is constructed as a foundation such as a bridge and a transmission line tower, and the deep foundation pile foundation first excavates the ground to form the deep foundation shaft 2, as shown in FIG. the shinso pit two laps wall surface in the circumferential wall of the-proof your wall 5 with building a protective wall 5 such as earth retaining a concrete or liner plate, an upper end to facilitate transfer falling rebar unit body 1 is slightly bent outward Are erected, and the guide muscle stab muscles 6, 6,... That support the guide muscles 4, 4,. From the bottom to the bottom.

  In addition, as shown in FIG. 2, the reinforcing bar unit 1 is formed by connecting the strips 7, 7,. .. Are formed in a double ring shape, and the shear reinforcement bars 8, 8,... Are connected to the ring band bars 7, 7,. It is formed by forming a block body 9 and supporting the later-described reinforcing bar block body 9 by a plurality of stages with both receiving ladder bars 10 and one receiving ladder bars 11.

  Therefore, as shown in FIG. 3, the two receiving ladder bars 10 are provided with a support body 10a having a substantially U-shaped cross section and a plate-like connecting body 12 at the lower end thereof, and rod-like support receiving bars 13, 13,. Six points are provided at predetermined intervals from the lower part so as to protrude to the left and right sides of the support body 10a. The above-mentioned substantially U-shaped cross section may be a square pipe shape or the like, and is not particularly limited to the shape.

  Further, as shown in FIG. 4, the one-piece ladder muscle 11 is provided with a support body 11 a having a substantially L-shaped cross section and a plate-like connecting body 12 a at the lower end, and is supported in a bar shape and protrudes to one side. Are provided at predetermined intervals from the lower part thereof. The substantially L-shaped cross section may be a square pipe shape or the like, and is not particularly limited to the shape.

The receiving ladder muscles 10 are between the inner and outer double bands 7 as shown in FIG. 2, and as shown in FIG. .. Are supported by the support receiving bars 13, 13,... And hooks 15, 15,... At the ends of the shear reinforcement bars 8, 8,. Further, the shear reinforcing bars 8, 8,... Are hooked and supported so as to cross and overlap, and are constructed by binding or welding.
In addition, although the arrangement | positioning of this both receiving ladder muscle 10 shown in FIG. 2 is each arrange | positioned by eight places, the number of arrangement | positioning is not specifically limited, It determines according to the cyclic | annular diameter of the reinforcing bar unit body 1. FIG.

Further, as shown in FIG. 2, the one-piece ladder bars 11 are arranged at predetermined positions in the vicinity where the shear reinforcing bars 8, 8,... Are crossed in a lattice shape, as shown in FIG. Are supported and received by the support receiving bars 14, 14,..., And the shear reinforcing bars 8, 8,. Built.
In addition, the arrangement position and the number of arrangement of the piece receiving ladder bars 11 are determined corresponding to the annular diameter of the reinforcing bar unit body 1.

Then, a ladder muscle 11 receives ladder muscle 10 or one above both received, the support receiving muscle 13 or the support receiving muscle 14 of the predetermined stages, hoop 7,7, ... and shear reinforcement 8,8, ... There Ru is being received supported is formed as one step rebar block body 9.

As described above, hook portions 15 and 15 are formed on the distal ends of the arc-shaped strips 7, 7... And the linear shear reinforcement bars 8, 8. Are connected with a predetermined overlapping lap length, and are connected to each other with a predetermined ring diameter or length.

  Thus, in the procedure for constructing the reinforcing bar unit body 1, the temporary assembly jigs 16, 16,... Are arranged and fixed in advance at predetermined positions so that the reinforcing bar unit body 1 has a predetermined shape as shown in FIG. In addition, both receiving ladder muscles 10, 10,... And one receiving ladder muscles 11, 11,.

  Therefore, as shown in FIG. 8, the temporary assembly jig 16 includes a column main body 17 having a substantially T-shaped cross section and a column holding base 18 formed below the column main body 17. The column is supported upright by the column holding base 18. On the front side of the main body 17, pivot support members 19, 19,... Are pivotally mounted so as to be pivotable with the same spacing and number of arrangement as the support receiving bars 13, 14, and the pivot support members. 19, 19,... Are formed so as to form a concave support receiving portion 20 on the upper side of the projecting portion and are supported so as to be able to be reversed from the horizontal to the rear. This is a stopper 21 for preventing rotation.

The above temporary assembly jig 16, 16, ..., from the outer diameter to be constructed as a reinforcement unit body 1 in advance fixed to a predetermined position outside arranged, also both undergo ladder muscle 10, 10, ... is is movably disposed at an intermediate position of the double annular, and portion receiving ladders muscle 11, 11, ... it is also in their respective arrangement while movably disposed respectively in a predetermined position inside the annular, arcuate Are temporarily supported by the rotation supports 19, 19,... Of the temporary assembly jigs 16, 16,. , 13,... Are supported, and are bound or welded to the support receiving bars 13, 13,... And connected to each other with a predetermined wrap length to form an annular shape. The straps 7, 7,... Are similarly connected to the support receivers 13, 13,. Or welding to form a inner and outer double ring.

Further, the shear reinforcement 8,8, ..., as shown in FIGS. 6 and 7, in accordance with the said annular diameter connected linearly at a predetermined wrap length, hook portions 15 of the both ends thereof the It is hung on the outer strip 7 formed in an annular shape and arranged in a predetermined lattice shape, and is supported or received by the support receiving bars 14, 14,... Of the single receiving ladder bars 11, 11,. The rebar block body 9 is constructed by the annular band 7 and the shear reinforcement bars 8, 8,..., And the rebar block body 9 is also supported by the temporary assembly jigs 16, 16,. both receiving ladders muscle 10, 10, ... and portion receiving ladders muscle 11, 11, predetermined by the support six stages in ... by welding or tying to have built rebar unit body 1.

As shown in FIG. 1, the rebar unit body 1 constructed on the ground is suspended and transferred by the crane 22 or the like via the suspension support 3 and lowered into the deep foundation shaft 2 , so that the deep foundation shaft The rebar unit bodies 1 are stacked and constructed from the bottom surface of 2 to construct a rebar assembly 23.

Therefore, in the transfer, as shown in FIG. 7, the suspension support body 3 is a square pipe or the like , for example, has a suspension frame body 3 a formed in a planar octagon shape and a linear straight suspension support frame 3 b, The suspension support body 3 is suspended and transferred by a crane 22 or the like. The suspension support body 3 is provided with a transfer jig body 24 in a hanging manner at a predetermined position, as shown in FIGS.

該移oct Specifically 24, as shown in FIGS. 9 and 10, Obisuji 7,7 to elongated support body 25, ... and the support bracket 26, 26 at the same position, ... and rotatably, respectively in the illustrated As shown in FIG. 10, the support metal fitting 26 is pivotally provided from the front side of the support main body 25 and has a concave support receiving portion 27 on the upper side of the protruding portion. It is formed and pivoted so that it can be reversed from the horizontal to the rear, and a holding metal fitting 28 for holding the band 7 is pivotally attached to the support metal fitting 26.

In addition, since the transfer jig body 24 supported by the linear straight suspension frame 3b shown in FIG. 7 is the same as described above and operates in the same manner, the arrangement position is particularly shown in FIG. it is, in particular, description is omitted, in the drawings, 29 and 30, a stopper 29, 30 of the pivot stop in the support fitting 26 and the pressing retaining bracket 28.

And when transferring the rebar unit body 1 constructed on the ground as described above with the suspension support body 3, first, as shown in FIG. 9, the transfer jig body 24 provided on the suspension support body 3 , an annular hoop 7,7, lowered ... inside of that time, the support bracket 26, the inverted shape ... and the press supporting bracket 28, ... to the rear together with the said girdle muscular 7,7 abutting ... in While swung, the band 7, 7,... Are passed through and lowered to the lowest level as shown by the arrows in the figure.

Then, when lowered to the bottom, as shown in FIG. 10, the support bracket 26 pivots back from the rear to return to the original horizontal position, and when it is stationary, slightly lifts the suspension support 3. As shown in the figure, the band 7 is supported and received, and the holding metal fitting 28 is rotated to hold and hold the band 7, and are stopped by the stoppers 29 and 30 for preventing rotation, and the band 7 is held. Thus, the reinforcing bar unit body 1 is held by the transfer jig body 24 and can be transferred by the suspension support body 3.

Further, the situation where the temporary assembly jigs 16, 16,... Are transferred to the transfer jig bodies 24, 24,... Is when the rebar unit body 1 is suspended and transferred. When lifted, the rebar bars 7, 7,... Of the reinforcing bar unit body 1 abut and push up from the lower side of the rotary supports 19, 19,... Of the temporary assembly jigs 16, 16,. By being inverted , the temporary assembly jigs 16 are separated from the temporary assembly jigs 16, 16 ,.

The support bracket 26 and 26 described above, ... and the presser holding fixture 28, ... is, hoop 7,7, the iron muscle unit body 1 by holding a state holding the ... Although Tsu支transfer, temporary assembly jigs The tools 16, 16,... Are erected in a state where they are left as they are after the rebar unit body 1 is transferred to the transfer jig body 24.

Then, as shown in FIG. 1, the reinforcing bar unit 1 is transferred into the deep foundation shaft 2 by the suspension support 3, and the strip bars 7, 7,. Lower it along.
The first stage is placed on the bottom surface of the deep foundation shaft 2 and the horizontal level of the rebar unit body 1 is set, so that the rebar unit body 1 is accurately measured by a measuring instrument such as transit. Are connected to each other by means of a plate-like member for raising the bottom or the connecting bodies 12, 12a. The horizontal level is set by changing the thickness and adjusting the height .

  As shown in FIG. 11, the two receiving ladder bars 10, 10,... Of the reinforcing bar unit body 1 and the connecting bodies 12, 12a of the single receiving ladder bars 11, 11,. And the guide bars 4, 4,... And the belt bars 7, 7,... Are welded and fixed, and then the first stage work scaffold 31 is constructed, and further, when the next reinforcing bar unit body 1 is built and constructed, The member constructs the reinforcing bar unit body 1 on the ground and lowers it, and then descends to the first stage work scaffold 31 to receive both ladder ladders 10, 10,. The upper parts of the single-sided ladder bars 11, 11,... And the connecting bodies 12 and 12a are overlaid, positioned and leveled, and then fixed by welding.

As described above, after the rebar unit body 1 is constructed, transported and fixed repeatedly, and the rebar unit body 1 is built up to the ground, as shown in FIG. hoop 7,7, ... vertical main bars 32 and 32, the girdle muscular 7,7 causes erected from the bottom by inserting ..., ... in the welding or tying to build a rebar assembly 23.
After the construction is completed, concrete is cast in the deep foundation shaft 2 to complete the deep foundation pile foundation.

  In addition, although the example which assembles to the ground at a stretch in the 3rd process, constructs the reinforcing bar assembly 23 and puts concrete at the end is shown, it is about performing concrete placing in the middle of reinforcing bar construction Will be changed and implemented as appropriate depending on the scale of the deep foundation pile and the manufacturing capacity of the nearby ready-mixed concrete contractors.

  Moreover, although it has transferred with the transfer jig | tool body 24 of the suspension support body 3, both the receiving ladder muscles 10, 10, ... and the single receiving ladder muscles 11, 11, ... are directly carried out by the suspension frame 3a of the suspension support body 3. Although it may be suspended and transferred, the illustration is omitted.

  Furthermore, since each member used in the present invention greatly depends on the natural environment and construction specifications of the place where the deep foundation pile foundation is constructed, the shape, number of use, etc. of each member are appropriately changed in design. .

  INDUSTRIAL APPLICABILITY The present invention can be used for building construction of a reinforcing bar assembly used for a foundation pile foundation when building a bridge, a transmission line tower, and the like, and a reinforcing bar unit body constituting the reinforcing bar assembly and its transfer.

DESCRIPTION OF SYMBOLS 1 Reinforcement unit body 2 Deep foundation shaft 3 Suspended support body 4 Guide reinforcement 7 Band reinforcement 8 Shear reinforcement reinforcement 9 Reinforcement block body 10 Both receiving ladder muscle 11 Single receiving ladder muscle 12, 12a Connection body 13,14 Support receiving reinforcement 15 Hook part 16 Temporary assembly jig 19 Rotating support body 23 Reinforcing bar assembly 24 Transfer jig body 26 Support metal fitting 31 Work scaffolding 32 Longitudinal main reinforcement

Claims (7)

In a reinforcing bar construction method for constructing a reinforcing bar assembly in a deep foundation shaft excavated for foundation by excavating a foundation deep foundation shaft in the ground, an arc-shaped double-sided hook with internal and external double A reinforcing bar block body formed by connecting and forming a desired number of annular reinforcing bars in a grid pattern in the radial direction on the annular band bars, and supporting or binding and supporting the reinforcing bar block bodies. Reinforcing bars are provided with a predetermined number of steps on the ladder bars, and a reinforcing bar block body is bound or welded to the supporting receiving bars to form a reinforcing bar unit body. The ladder bars are arranged in an annular band and shear reinforcement bars. The ladder bars and / or temporary assembly jigs are pre-positioned to construct a reinforcing bar unit body on the ground so that a plurality of the reinforcing bar block bodies are accurately formed in a predetermined shape. The first step to do
At least the required number of guide bodies are erected and supported from the wall surface at the required position on the wall surface of the deep foundation shaft, and the rebar unit body is suspended and transferred to the deep foundation shaft by the suspension support body, and the deep foundation shaft along the guide body. A second step of transferring and lowering the reinforcing bar unit body to a predetermined position, and binding or welding the reinforcing bar unit body to the guide body;
A third step of sequentially welding the ladder bars of the transferred reinforcing bar unit body together with the reinforcing bar unit body construction in succession after the heavy welding,
After a certain reinforcing bar unit body is built in the deep foundation shaft, the longitudinal main bars are arranged at the required positions of the reinforcing bar unit bodies, and the longitudinal main bars and the reinforcing bar unit bodies are bound or welded to form a reinforcing bar assembly. Reinforcement construction method of deep foundation pile characterized by construction.   The rebar block body of the first stroke is bound or welded to the ladder bars in the required number of steps to form a reinforcing bar unit body, and the height of the reinforcing bar unit body is slightly lower than the line of sight of the worker and the ladder The method for constructing a reinforcing bar for a deep foundation pile according to claim 1, wherein the reinforcing support is supported by each support receiving bar of each bar or each support body of the temporary assembly jig or both.   The suspension unit transfer of the reinforcing bar unit body by the suspension support body in the second stroke is performed by transferring the reinforcing bar unit body constructed in the temporary assembly jig to the support fixture of the transfer jig body provided in the suspension support body. Reinforcement construction method for deep foundation piles according to claim 1 or claim 2, wherein the support is transferred.   In the construction of the working scaffold in the third stroke, the ladder bars of the reinforcing bar unit body are overlaid and fixed in a stacked manner, and then the working scaffold is constructed as a working scaffold at a position one step lower than the reinforcing bar unit body. The reinforcing bar construction method for deep foundation piles according to any one of claims 1 to 3, wherein In a reinforcing bar unit body that constructs a reinforcing bar assembly in a deep foundation shaft, an arc-shaped and double-ended hook shape is connected to the inner and outer double rings in the required number, and shear reinforcing bars are connected to the annular band bars. Reinforcing bar block body formed by arranging the bars in a grid pattern in the radial direction,
In addition, a required number of support bars for the ladder bars are provided at a predetermined interval, and the reinforcing bar block body is bound or welded and supported on the support bar, and the ladder bars are arranged for the band bars and the shear reinforcement bars of the reinforcing bar block body. A reinforcing bar unit having a plurality of pieces arranged at a required position and bound or welded.   6. The reinforcing bar unit according to claim 5, wherein a plate-like connecting body is provided on at least one of the top and bottom of the ladder bars so that the ladder bars can be connected vertically.   In the suspension support body that suspends and transports the reinforcing bar unit body in the deep foundation shaft, a suspension frame body is formed so as to correspond to the planar shape of the reinforcing bar unit body having ladder bars, and a transfer jig body is attached to the suspension frame body. A hanging support body of a reinforcing bar unit characterized in that a required number is arranged in a hanging shape.

Images