JP2007205081A - Load release device for pipe support for timbering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe support for timbering provided with a load release device attaining simplification of structure and improvement of work efficiency in installation and dismantlement of timbering. <P>SOLUTION: The pipe support A comprises an outer pipe 1, an inner pipe 2, an adjusting ring 5 for adjusting the extension length of the inner pipe 2, and the load release device 7 for releasing axial force applied to a screwed part of the adjusting ring 5 and a screw part 6a when dismantling the timbering. The load release device 7 comprises a vertical pair of outer cylinders 7a, 7b and an inner cylinder 7c fittingly inserted in a coaxially turnable manner to straddle divided end faces 14, 15. The outer cylinders 7a, 7b are arranged on the lower end side of the outer pipe 1, and the divided end faces 14, 15 are provided with a vertical pair of load release recessed parts 18, 19. The recessed bottom end faces 18a, 19a of the load release recessed parts 18, 19 are of tapered shape gradually inclining from one end side toward the other end side in a circumferential direction. The inner cylinder 7c comprises a load holding handle 17 interposed between the load release recessed parts 18, 19 to axially space the outer cylinders 7a, 7b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe support for a supporting work used in every construction site such as construction, demolition, and civil engineering, and mainly supports a large formwork of a ceiling formwork or a beam formwork in a construction site of a concrete building. The present invention relates to a support pipe support provided with a load releasing device for releasing a load acting on a screwed portion of an adjustment ring when dismantling the support work.

A pipe support is mainly used for a column-type support that supports a ceiling formwork or a large formwork of a beam form in order to construct a floor or a beam of a concrete building (see, for example, Patent Document 1). An example is shown in FIG.
As shown in FIG. 7, the pipe support 40 mainly includes an outer tube 41 and an inner tube 42 that is inserted into the outer tube 41 so as to be extendable and slidable.
The inner tube 42 is provided with a plurality of pin holes 43 at equal intervals in the axial direction. In addition, the screw portion 44 provided on the upper end side of the outer tube 41 is provided with an elongated hole 45 in the axial direction. By inserting the support pin 46 through the long hole 45 and each pin hole 43 of the inner tube 42, the outer tube 41 and the inner tube 42 are connected, and the long hole 45 and the inner tube 42 formed by the support pin 46 are connected. By changing the connection position with any pin hole 43 in the axial direction, the expansion / contraction length of the inner tube 42 with respect to the outer tube 41 can be appropriately changed.
That is, the length (total height) of the pipe support 40 extending from the lower end of the outer tube 41 to the upper end of the inner tube 42 changes the connecting position of the long hole 45 by the support pin 46 and any pin hole 43 of the inner tube 42. Therefore, it can be roughly changed as appropriate.

In addition, an adjustment ring 47 having a jack handle 48 is screwed into the threaded portion 44 of the outer tube 41. By rotating the adjustment ring 47 with the jack handle 48, the extension length of the inner pipe 42 connected via the support pin 46 with respect to the outer pipe 41 can be finely adjusted. Yes.
That is, when assembling and installing the support work, any pin hole 43 of the long hole 45 of the outer tube 41 and the inner tube 42 is selected and the support pin 46 is inserted, so that the inner tube is inserted from the lower end of the outer tube 41. The length (full length) of the pipe support 40 reaching the upper end of 42 is roughly determined, and in this state, the ceiling form frame for supporting the pipe support 40 from the floor B of the construction site, the beam form large pulling material C, etc. The inner ring 42 is gradually raised from the outer pipe 41 by screwing and turning the adjustment ring 47 by the jack handle 48 and turning the pipe ring 40 from the floor surface B to the large pulling material C. It is possible to perform jack-up by fine adjustment to match the height dimension up to.
When the support is dismantled after the concrete is hardened, the inner tube 42 is moved into the outer tube 41 by screwing and turning the adjusting ring 47 so as to release the support of the pipe support 40 that supports the large pulling material C and the like. The jack can be lowered so as to return to the position.

  Base plates 49 and 50 are provided at the lower end of the outer tube 41 and the upper end of the inner tube 42, respectively, and can be used as a ceiling frame for supporting the pipe support 40 from the floor surface B or a large pulling material C for a beam frame. In the state where the pipe support 40 is leaned vertically toward the floor, the floor surface B and the large pulling material C are secured by appropriate fixing means such as nailing and bolting so that the pipe support 40 moves carelessly and does not fall over and is stably supported. It is possible to fix to.

By the way, the pipe support is elastically deformed in the axial direction due to a load applied during concrete pouring, and most of the deformation is retained after the concrete is hardened. Therefore, when dismantling the support after the concrete curing period is over, jack down to reduce (lower) the inner tube by rotating the adjusting ring with the jack handle while receiving axial compression force. It must be made.
Thus, in the conventional jackdown, the inner tube is reduced by rotating the adjusting ring, but the axial force (load) is applied to the screwing portion of the adjusting ring and the screw portion. The adjustment ring must be rotated with. That is, it is not easy to rotate the adjustment ring in a state where the screw is tightened with a large frictional force. Therefore, the jack cannot be lowered unless the adjusting ring is gradually rotated while repeatedly hitting the jack handle of the adjusting ring with a hammer or the like. Further, the jack handle may be damaged by repeated hammering.

In view of these problems, a support pipe support has been proposed that has been developed so that the number of hammer strikes can be reduced and the inner pipe can be easily reduced (lowered) and jacked down. (For example, refer to Patent Document 2 and Patent Document 3).
Japanese Patent Laid-Open No. 9-291709 (see paragraph numbers 0015 to 0017, FIG. 5) Japanese Patent No. 3375733 (see paragraph numbers 0012 to 0019, FIG. 1, FIG. 2 and FIG. 4) JP-A-7-197672 (see paragraphs 0011 to 0017 and FIGS. 1 to 5)

  However, the jackdown device for the pipe support for support described in Patent Document 2 and Patent Document 3 has a large number of parts and a complicated structure. For this reason, there was a problem that the production was troublesome and, in turn, caused an increase in cost. Therefore, depending on the scale of the site, there has been a problem in practical use in terms of cost as a support pipe support used in large numbers such as hundreds for each floor floor.

In addition, the conventional pipe support for support works has a jack-down device coaxially arranged at the upper end (top) of the outer pipe (post), and the inner pipe that can be extended and slidably inserted into the outer pipe is connected to the jack handle. It is configured to support through an adjustment ring having. Therefore, when the concrete curing period is over and the support work is dismantled, it is difficult to work because it is necessary to hit the load release handle of the high jackdown device located at the upper end of the outer pipe with a hammer. It was dangerous.
In other words, the outer pipe constituting the pipe support has several lengths corresponding to the ceiling height (slab height) of the construction site or the like. For example, there is an outer tube with a height (length) of 1800 mm. In this case, the worker who disassembles the support work can use a stepladder or the like to hit the load release handle of the jackdown device with a hammer or the like. The load release handle must be struck in a situation where the platform is raised and the platform is unstable.
Therefore, in the past, workability was extremely poor and the scaffolding was very unstable, so the support work was carried out in a dangerous environment such as the possibility of losing balance due to inertial force when swinging the hammer. It would have been necessary if the dismantling work was not continued.

  Also, in the past, it was necessary to move the stepladder every time a pipe support was jacked down and removed, and to jack down the pipe support on a stepladder with extremely poor workability. The work was dismantled as a typical support work, which in turn resulted in excessive labor for the workers. Of course, this inefficient work is not only for dismantling work, but also when assembling and installing a support work by leaning vertically against the ceiling formwork that supports the pipe support or the large formwork of the beam formwork. This was also true for assembly work.

  Accordingly, the present invention has been developed to solve the above-described problems, and includes a load release device that simplifies the structure and improves workability when assembling and installing a support work or disassembling. It is to provide pipe support for support.

  In order to solve the above-mentioned problems, in the present invention, in claim 1, the present invention includes an outer tube and an inner tube that is slidably inserted into the outer tube, and further, the inner tube expands and contracts with respect to the outer tube. An adjustment ring having a jack handle that is mounted so as to adjust the length by screwing, and a load release device for releasing a load that acts on the screwing portion of the adjustment ring when the support work is dismantled A pipe support for supporting work, and a pair of upper and lower outer cylinders that are divided vertically in the axial direction, and a pair of upper and lower outer cylinders that are fitted and inserted into the outer cylinders so as to be coaxially rotatable. And the pair of upper and lower outer cylinders are formed so as to be fitted and connected to an appropriate position in the axial direction of the outer pipe or the lower end side of the outer cylinder, and on the divided end surface Is a notch formed at an appropriate depth in the axial direction A pair of upper and lower load release recesses having end surfaces, and of the pair of upper and lower load release recesses, at least one of the bottom end surfaces of the recesses approaches the split end surface from one end to the other end. The inner cylinder is provided with a load holding handle that is slidably interposed in the circumferential direction between the pair of upper and lower load release recesses, the load holding handle, The pair of upper and lower load release recesses are interposed between the other end sides of the bottom end surfaces of the recesses, so that the pair of upper and lower outer cylinders are held in an axially separated state, while the recesses It is formed so as to reduce the distance between the pair of upper and lower outer cylinders by being moved to one end side along the bottom end face.

  According to the configuration of the first aspect, the load releasing device arranged coaxially connected to the appropriate portion of the outer tube or the lower end side of the outer tube includes the pair of upper and lower outer tubes and the pair of upper and lower outer tubes. The inner cylinder is inserted into a pair of upper and lower outer cylinders so as to be coaxially rotatable so as to straddle the divided end surfaces. This reduces the number of parts compared to conventional equipment, simplifies the structure, supports pipe support for load support with a load release device that can be expected to improve productivity and significantly reduce costs. Can be provided.

  According to a second aspect of the present invention, the load holding handle has a pressure receiving surface formed so as to be in surface contact with the bottom surface of the bottom of the notch in parallel with the bottom surface of the bottom of the bottom of the pair of upper and lower load release recesses. It is characterized by having.

  According to the structure of claim 2, when assembling and installing the support work, the load holding handle of the inner cylinder is interposed between the other end sides of the bottom end surfaces of the bottom of the pair of upper and lower load release recesses. When holding the pair of upper and lower outer cylinders in a state of being separated in the axial direction, the bottom end surfaces of the pair of upper and lower load release recesses are stably held in surface contact with the pressure receiving surfaces of the upper and lower surfaces of the load holding handle. can do. That is, the axially separated state of the pair of upper and lower outer cylinders can be stably maintained. On the other hand, when dismantling the support work, the load holding handle is moved (slided) along the bottom end surface of the bottom of the pair of load release recesses to one end side of the bottom end surface of the recess, and the pair of top and bottom By reducing the separation distance of the outer cylinder, the separated holding state can be easily released.

  According to a third aspect of the present invention, a lock mechanism is provided on the circumferential side surface of the pair of upper and lower outer cylinders, and the load holding handle of the inner cylinder is connected to the other inclined end of the bottom surface of the notched bottom of the pair of upper and lower load release recesses. The load holding handle is held at the interposed position when the load holding handle is interposed between the sides.

  According to the configuration of the third aspect, the upper and lower pair of outer cylinders are interposed between the other end sides of the bottom end surfaces of the pair of upper and lower load release recesses in order to maximally separate them in the axial direction. Further, the load holding handle of the inner cylinder can be held at the intervening position by the lock mechanism. As a result, when assembling and installing the support work, the load holding handle of the inner cylinder inadvertently moves from one end side to the other end side of the bottom end surface of the notch of the pair of upper and lower load release recesses. The risk of being lost. Therefore, it is possible to quickly execute the assembling work of the support work in which the pipe support is vertically leaned toward the ceiling form frame that supports the pipe support from the floor surface or the large pulling material of the beam form form.

  According to claim 4, of the pair of upper and lower outer cylinders, the lower outer cylinder includes a base plate, and the upper outer cylinder is coaxially fitted and connected to the lower end side of the outer pipe. It is characterized by that.

  According to the configuration of the fourth aspect, when assembling and installing the support work or when disassembling, particularly when disassembling the support work, a pair of upper and lower load release devices arranged at the lower end of the outer pipe. The releasing operation for reducing the distance between the outer cylinders and releasing the holding state can be performed on the lower end side of the outer pipe. That is, it can be performed on the floor surface where the pipe support is vertically leaned. As a result, the operator taps the load holding handle of the inner cylinder with a hammer or the like while the feet are stabilized on the floor, and the distance between the pair of upper and lower outer cylinders is reduced as described in claim 2. It is possible to easily remove the ceiling-type frame or the beam-type large pulling material that supports the pipe support with the floor surface by releasing the separated holding state.

  According to a fifth aspect of the present invention, the pair of upper and lower outer cylinders are connected so as to approach or be separated coaxially in the axial direction by a connecting member provided on a circumferential side surface.

  According to the configuration of the fifth aspect, the pair of upper and lower outer cylinders in which the inner cylinder is installed so as to be coaxially rotatable is not inadvertently disassembled. Thereby, a pair of upper and lower outer cylinders, that is, a load release device can be transported and carried to a construction site or the like in a state where the load release device is coaxially assembled and connected to the outer pipe of the pipe support. In other words, it is possible to support the pipe support vertically against the ceiling formwork that supports the pipe support from the floor or the large formwork of the beam formwork without performing assembly work such as attaching the load release device to the pipe support at construction sites. Assembly and installation work can be performed.

  Since the present invention is configured as described above, the structure can be simplified, and improvement in productivity and cost reduction can be expected. In addition, workability when assembling and installing the support work or dismantling can be greatly improved, and the work time can be expected to be greatly shortened. In addition, it is possible to expect a number of effects such as the ability to significantly reduce excessive labor for the worker.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
Drawing 1 is a side view showing the whole pipe support for support provided with the load release device concerning this embodiment.

≪Explanation of pipe support≫
As shown in FIG. 1, the pipe support A is a support column having a length (height) adjustable with the outer tube 1 and the inner tube 2 as main members, and the lower end of the outer tube 1. Base plates 3 and 4 are provided at the upper end of the inner tube 2. A screw tube 6 is fitted on the upper end of the outer tube 1 so as to be coaxial. An adjustment ring 5 having a jack handle 13 is screwed to the screw portion 6a of the screw tube 6.

  And in this embodiment, as shown in FIG. 1, the curing period which concrete hardens | cures by fitting and connecting the load release apparatus 7 provided with the baseplate 3 to the lower end side of the outer tube | pipe 1, and arrange | positioning coaxially. When the support work is dismantled after the operation is completed, the axial force (load) acting on the screwing position of the adjusting ring 5 and the screw portion 6a is quickly removed to support the pipe support A with the floor surface B. The pipe support A is configured so that it can be easily removed from the space between the ceiling formwork and the large formwork C of the beam formwork.

≪Explanation of outer and inner pipes≫
The outer tube 1 and the inner tube 2 are formed in a hollow pipe shape having a predetermined thickness (tube diameter) and length from a desired metal material such as stainless steel or aluminum.
In consideration of weight reduction of the pipe support A, it is desirable to form the outer tube 1 and the inner tube 2 using aluminum or an aluminum alloy.
Although not shown, the inner peripheral surfaces of the outer tube 1 and the inner tube 2 are provided with reinforcing portions extending in a substantially convex shape in the axial direction at important points spaced equally in the circumferential direction. Therefore, it has a cross-sectional structure in which the load bearing strength (allowable proof stress: t / piece) of the pipe support A is effectively enhanced.

  The outer tube 1 is provided with a screw tube 6 having a screw portion 6a made of a male screw on the upper end portion thereof coaxially. The screw tube 6 is fixed by bolting at a circumferential point. The screw tube 6 has an axially long hole 8 opened so as to be opposed to each other on a straight line (diameter) passing through the axis of the screw tube 6 in a plan view. By inserting a support pin 10 connected by a chain 11 into the hole 9, the inner tube 2 is formed to be connected to the outer tube 1 with an arbitrary extension / contraction length.

  The screw tube 6 is made of the same material as the outer tube 1. The screw tube 6 is provided with a pin receiving ring 12 so as to be mounted on the adjustment ring 5, and the long hole 8 and the inner tube 2 of the screw tube 6 are interposed via the pin receiving ring 12. The support pin 10 is inserted into the pin hole 9.

  The inner tube 2 is formed so that the outer diameter is substantially the same as the inner diameter of the outer tube 1 and is inserted into the outer tube 1 so as to be extendable and slidable. Pin holes 9 are provided at predetermined intervals in the axial direction so as to form a pair at four positions facing each other on a straight line.

≪Explanation of adjustment ring≫
The adjustment ring 5 is screwed into the threaded portion 6a of the outer tube 1 and supports the support pin 10 via the pin receiving ring 12 at the upper end surface thereof. That is, the inner tube 2 is supported with respect to the outer tube 1 via the support pins 10 so that the inner tube 2 can be extended and contracted freely. It is formed so that the thickness can be finely adjusted as appropriate.
And the jack handle 13 is attached so that it can be folded and rotated in two or four directions on the circumferential side surface of the adjusting ring 5, and when used, as shown by a two-dot chain line in FIG. The horizontal posture is set horizontally, and when not in use, the vertical posture is set downward.

≪Explanation of load release device≫
2A and 2B show a load releasing device according to the present embodiment, in which FIG. 2A is a side view, FIG. 2B is a vertical cross-sectional view taken along line bb in FIG. It is a cc line cross-sectional view of a). FIG. 3 is an exploded perspective view showing the load releasing device according to the embodiment.
As shown in FIGS. 2 and 3, the load release device 7 straddles the pair of upper and lower outer cylinders 7 a and 7 b divided vertically in the axial direction and the divided end surfaces 14 and 15 of the pair of upper and lower outer cylinders 7 a and 7 b. In other words, the inner cylinder 7c is fitted into the outer cylinders 7a and 7b so as to be coaxially pivoted so as to straddle the lower end of the upper outer cylinder 7a and the lower end of the lower outer cylinder 7b. Configured. In the drawings, the upper outer cylinder 7a is an upper outer cylinder, and the lower outer cylinder 7b is a lower outer cylinder.

  The load releasing device 7 includes a lock mechanism 16 on the outer circumference of the lower outer cylinder 7b, as shown in FIGS. 2 and 3, of the pair of upper and lower outer cylinders 7a and 7b. A load holding handle 17 which will be described later by the mechanism 16 is connected to the other end of the inclined bottom end surfaces 18a and 19a of a pair of upper and lower load releasing recesses 18 and 19 which will be described later. When being interposed, the load holding handle 17 is held at the interposed position.

≪External cylinder explanation≫
The pair of upper and lower outer cylinders 7a and 7b are formed in a hollow cylinder shape having an outer diameter (cylinder diameter) substantially equal to the outer diameter of the outer tube 1 from a desired metal material such as stainless steel or aluminum.
The upper outer cylinder 7a is formed of the outer tube 1 that is slightly thinner than the lower half side having the divided end surface (opening lower end surface) 14, as shown in FIGS. 2 (a) and 2 (b) and FIG. The connection cylinder part 20 which has the same outer diameter as an internal diameter is formed in the stepped cylinder shape provided with the upper half part side. On the other hand, the lower outer cylinder 7b is formed in a straight cylindrical shape having the same outer diameter and inner diameter as the outer diameter and inner diameter of the lower half portion of the upper outer cylinder 7a. The base plate 3 is integrally provided on the lower end surface side of the opening.

  Then, as shown in FIGS. 2A and 2B and FIG. 3, the connection cylinder portion 20 of the upper outer cylinder 7a has four locations so as to face each other on a straight line passing through the axis in plan view. A connection hole 21a is opened, and a connection member 22 made of a pin, a bolt, or the like is inserted into a connection hole 21b that is also opened on the lower end side of the outer tube 1 to be coaxial with the lower end side of the outer tube 1. It is designed to be connected.

  Further, as shown in FIGS. 2 and 3, the pair of upper and lower outer cylinders 7a and 7b are symmetrically formed on the respective divided end surfaces 14 and 15 with a predetermined depth in the axial direction and in the vertical direction toward the circumferential direction. A pair of upper and lower load release recesses 18 and 19 are formed.

≪Explanation of load release recessed part≫
As shown in FIG. 2C and FIG. 3, the pair of upper and lower load release recesses 18 and 19 are seen in a plan view on the circumference of the divided end surfaces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b. It is formed at two locations so as to oppose each other on a straight line (diameter) passing through the shaft core P, and is provided with concave bottom end surfaces 18a and 19a inclined in the circumferential direction.

  Then, as shown in FIG. 3, the one side and the other side of the concave bottom end surface 18a facing each other on the straight line (diameter) passing through the axis P of the upper load release concave portion 18 are inclined (divided end surfaces). Taper shape gradually inclined so as to approach 14) is formed to have a reverse gradient in the circumferential direction. Further, on the one side and the other side of the concave bottom end surface 19a facing each other on the straight line (diameter) passing through the axis P of the lower load release concave portion 19, the inclination direction (divided) is the same as the concave bottom end surface 18a. The taper shape which is gradually inclined so as to approach the end face 15) is formed to have a reverse gradient in the circumferential direction.

  As a result, the pair of upper and lower load release recesses 18 and 19 formed in a vertically symmetrical shape in the circumferential direction across the divided end surfaces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b face each other in the axial direction. A trapezoidal space that is substantially horizontally oriented is formed. For example, when the inner cylinder 7c is rotated so as to move (slide) the load holding handle 17 of the inner cylinder 7c from the position of the two-dot chain line shown in FIG. Of the two load holding handles 17 of the inner cylinder 7c, the interposition positions in the circumferential direction of the pair of upper and lower load release recesses 18 and 19 where the load holding handle 17 on one side is interposed, and the load holding handle 17 on the other side The interposition position with respect to the pair of upper and lower load release recesses 18 and 19 in which the interposition is interposed has the same positional relationship.

≪Explanation of concave bottom end face≫
As shown in FIG. 2A, the recessed bottom end surfaces 18a and 19a are arranged so as to approach the divided end surfaces 14 and 15 from the deep wall surfaces 18b and 19b in the axial direction of the pair of upper and lower load release recessed portions 18 and 19, respectively. Tapered shapes are formed so as to be gradually inclined toward the shallow wall surfaces 18c and 19c in the axial direction at an appropriate inclination angle θ.

  As a result, as shown in FIG. 2, the load holding handle 17 of the inner cylinder 7c is positioned on the shallow wall surfaces 18c, 19c side of the pair of upper and lower load release recesses 18, 19 so that the recess bottom end surfaces 18a, 19a By interposing them in between, the split end faces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b are separated to the maximum extent. In this state, the pipe support A is vertically leaned from the floor B of the construction site toward the ceiling frame or beam frame large pulling material C and the like, so that the ceiling frame or beam frame large pulling material C is placed. Assembling and installation of a support work for arranging the pipe support A to support it is performed.

  In addition, although it does not specifically limit as inclination-angle (theta) of the notch bottom end surfaces 18a and 19a, In this embodiment, it sets to the range of 13 degrees-18 degrees. A preferable inclination angle θ is 15 °. As a result, in a state of contact with the pressure receiving surface 38 described later of the load holding handle 17 of the inner cylinder 7c, an axis misalignment or the like is caused by a load applied to the pipe support A from a large pulling material C of a ceiling mold or a beam mold. Stable support can be obtained with a stable coefficient of friction.

Further, as shown in FIG. 2A and FIG. 3, the outer cylinders 7a and 7b are connected to the circumferential side surfaces of the pair of upper and lower outer cylinders 7a and 7b so as to be able to approach and separate in the cylinder direction. A connecting member 23 is provided.
The connecting member 23 is formed in a vertically long and substantially strip-like shape having a long hole 24 for connecting the pair of upper and lower outer cylinders 7a and 7b so as to be separated and accessible in the axial direction. As shown in FIG. 3, the connecting member 23 is directly connected and fixed to the upper outer cylinder 7a by a bolt 25, and the elongated hole 24 is inserted into the lower outer cylinder 7b. It is formed so as to be connected by a bolt 26.

  The bolt 26 is a stepped bolt provided with a spacer portion having a thickness corresponding to the plate thickness of the connecting member 23 between the head portion and the shaft portion (screw portion). Thus, the lower outer cylinder 7b is connected to the upper outer cylinder 7a so as to be separated and accessible in the cylinder direction.

  2 and 3, a lock mechanism 16 is provided on the circumferential side surface of the lower outer cylinder 7b among the pair of upper and lower outer cylinders 7a and 7b.

≪Description of locking mechanism≫
As shown in FIG. 2 (a), the lock mechanism 16 is formed by placing the load holding handle 17 of the inner cylinder 7c on the shallow wall surfaces 18c and 19c side of the pair of upper and lower load release recesses 18 and 19, respectively. The load holding handle 17 is interposed between the bottom end surfaces 18a and 19a so that the separated end surfaces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b are spaced apart to the maximum extent. Hold.
That is, the load holding handle 17 is held immovably at the part so that it does not inadvertently move from between the concave bottom end surfaces 18a, 19a on the shallow wall surfaces 18c, 19c side of the pair of upper and lower load release concave portions 18, 19. It is configured to play a role.
As shown in FIGS. 2 and 3, the lock mechanism 16 includes a gripping member 16a that supports the load holding handle 17 so as to grip the load holding handle 17 from below, and a holding member 16b that maintains the supporting posture of the gripping member 16a. It is configured with.

  The gripping member 16a is formed in a substantially L shape in a side view including a latching portion 28 that protrudes upward so as to grip the load holding handle 17 from below. The gripping member 16a is pivotally supported by a bolt 29 in the vicinity of the shallow wall surface 19c of the load release recess 19 on the circumferential side surface of the lower outer cylinder 7b (see FIG. 5). 2 (see (a)).

Further, the gripping member 16a is provided with a knob 30 so that the operator grips the knob 30 and rotates the gripping member 16a to grip the load holding handle 17 of the inner cylinder 7c from below. The load holding handle 17 is formed so that the latching portion 28 can be latched.
And when releasing the latching state of the load holding handle 17 by the gripping member 16a, the knob 30 is directly picked to rotate the holding member 16b in the releasing direction (see FIG. 5C described later) When the gripping member 16 a is firmly engaged with the load holding handle 17, the gripping member 16 a can be detached from the load holding handle 17 by hitting the knob 30 with a hammer or the like.

  The holding member 16b is formed in a substantially strip plate shape having a desired plate thickness and a long slot 31 for sliding, and is provided with a holding portion 32 projecting outward at one end thereof. The holding member 16b is disposed by a bolt 33 on the circumferential side surface of the lower outer cylinder 7b so as to hold the supporting posture of the holding member 16a that supports the load holding handle 17 so as to hold the load holding handle 17 from the lower side. The bolt 33 is loosened to be slid, and the bolt 33 is tightened to be fixed. Further, a slide operation knob 34 is provided on the other end side of the holding member 16b.

≪Description of inner cylinder≫
The inner cylinder 7c has an outer diameter (cylinder diameter) that is approximately the same as the inner diameter of the pair of upper and lower outer cylinders 7a and 7b made of a desired metal material such as stainless steel or aluminum. The outer cylinder 7b is formed in a hollow cylinder having a length that can be accommodated over the upper half side of the outer cylinder 7b. The inner cylinder 7c is integrally provided with a load holding handle 17 on the circumferential side surface.

  Further, as shown in FIG. 2 (b) and FIG. 3, the inner cylinder 7c is formed between the upper and lower circumferential portions 35, 36, leaving an upper end circumferential portion 35 and a lower end circumferential portion 36 on the circumferential side surface. By providing a recess in the inner cylinder 7c, the sliding contact area with the inner peripheral surface of the pair of upper and lower outer cylinders 7a and 7b is reduced, and the inner cylinder 7c is coaxially rotated when the inner cylinder 7c is rotated by the load holding handle 17. And can be rotated smoothly. Further, as shown in FIG. 2C and FIG. 3, a window 37 is opened on the peripheral wall excluding the peripheral wall portion on which the load holding handle 17 projects.

≪Explanation of load holding handle≫
As shown in FIG. 2 (c), the load holding handle 17 has an internal relationship with a position shifted parallel to each other in the two directions facing each other on a straight line passing through the axis P of the inner cylinder 7c in plan view. A pressure receiving surface that protrudes integrally from the peripheral wall of the cylinder 7c with a predetermined thickness, and that is parallel to the direction of the inclination (taper) of the notched bottom end surfaces 18a and 19a of the pair of upper and lower load release notched portions 18 and 19 The cross section provided with 38 on both upper and lower sides is formed in a substantially trapezoidal shape.
Thus, the load holding handle 17 having the pressure receiving surfaces 38 on both the upper and lower surfaces and having a substantially trapezoidal cross section is positioned on the shallow wall surfaces 18c and 19c side of the pair of upper and lower load release recesses 18 and 19. In the state of being interposed between the concave bottom end surfaces 18a and 19a (state (a) in FIG. 2), the split end surfaces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b are separated to the maximum in the axial direction. In this state, the pair of upper and lower outer cylinders 7a and 7b are held.
When the pair of upper and lower load release recesses 18 and 19 are moved to the deep wall surfaces 18b and 19b, the pair of upper and lower outer cylinders 7a and 7b are released from being held away from the recess bottom end surfaces 18a and 19a. That is, the distance between the split end faces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b gradually decreases, and finally the pair of upper and lower outer cylinders 7a and 7b are pivoted until the split end faces 14 and 15 come into contact with each other. The load holding handle 17 moves toward the deep wall surfaces 18b and 19b along the notch bottom end surfaces 18a and 19a of the pair of upper and lower load release notches 18 and 19 so as to approach the direction. (See (d) of FIG. 5 described later).

  As a result, the height of the pipe support A is lowered by the amount that the divided end surfaces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b are brought into close contact with each other from the state where they are spaced apart to the maximum. That is, the axial force (load) acting on the screwed portion of the adjusting ring 5 and the threaded portion 6a is removed, and the adjusting ring 5 is easily screwed and rotated by the jack handle 13 without difficulty. Can be lowered so as to return to the inside of the outer tube 1.

[Description of modification of locking mechanism]
FIG. 4 is a side view of the load releasing device showing a modification of the lock mechanism.
As shown in FIG. 4, the lock mechanism 27 in this modified example may be constituted by a single gripping member 27 a formed in the same shape and structure as the gripping member 16 a of the lock mechanism 16 in the above-described embodiment. it can. In this case, the holding member 27a having the latching portion 39 projecting downward is pivotally supported by the bolt 29 in the vicinity of the shallow wall surface 18c of the load release recess 18 on the circumferential side surface of the upper outer cylinder 7a. It is arranged so that it can rotate up and down.
Thereby, when the load holding handle 17 of the inner cylinder 7c is interposed between the concave bottom end surfaces 18a, 19a located on the shallow wall surfaces 18c, 19c side of the pair of upper and lower load release concave portions 18, 19, The gripping member 27a can maintain the posture of gripping the load holding handle 17 by the latching portion 39 with its own weight.

Next, assembly installation and disassembly of the support work by the pipe support A including the load releasing device 7 configured as described above will be described.
FIG. 5 is a side view showing the movement of the load releasing device according to the present embodiment when dismantling the support work. Here, description will be made with reference to FIGS. 1 and 2 as appropriate.
First, the case where the support work is assembled and installed will be described.
As shown in FIG. 1, the pipe support A provided with the load release device 7 on the lower end side of the outer tube 1 is directed toward the ceiling form frame or the beam form large pulling material C which supports the floor surface B of the construction site. When standing vertically, the pair of upper and lower outer cylinders 7a, 7b of the load releasing device 7 are spaced apart from each other to the maximum in the axial direction, and the load holding handle 17 of the inner cylinder 7c is connected to the pair of upper and lower load releasing recesses 18, 19 is located on the shallow wall surface 18c, 19c side, and is interposed between the notch bottom end surfaces 18a, 19a of the load releasing recesses 18, 19 (state shown in FIG. 5C).

  Then, the latching portion 28 of the gripping member 16a of the lock mechanism 16 is latched by the load retaining handle 17 so as to be gripped from the lower side so that the load retaining handle 17 does not move from the interposition position. After the holding member 16b is slid so as to advance toward the gripping member 16a to a position where the support posture of 16a is held, the holding member 16b is fixed to the lower side of the gripping member 16a with a bolt 33 (FIG. 2 (a) and the state of FIG. 5 (a)).

  In this way, in the state where the pair of upper and lower outer cylinders 7a, 7b are separated to the maximum in the axial direction, an arbitrary pin hole 9 in the axial direction of the inner pipe 2 of the pipe support A and the screw pipe 6 of the outer pipe 1 are used. After the support pin 10 is inserted into the long hole 8 and the overall length (total height) of the pipe support A is roughly determined, the ceiling formwork or beam formwork that supports the pipe support A from the floor B of the construction site is extended. It leans vertically toward the material C or the like (see FIG. 1).

  After that, the adjusting ring 5 is screwed and rotated by the jack handle 13 so that the base plate 4 provided at the upper end of the inner tube 2 hits the large pulling material C, and the large pulling material C is reliably and accurately supported. Supporting work where pipe support A equipped with load release device 7 is leaned and arranged at important points according to the scale of the construction site while making fine adjustment to adjust the total length of the pipe support A so that the inner pipe 2 is jacked up to the height Perform assembly and installation work.

  When the support is dismantled after the concrete curing period is over, first, the bolt 33 that stops the holding member 16b of the lock mechanism 16 is loosened, and the holding member 16b is slid so as to move backward. The holding state of the gripping member 16a is released (see FIG. 5B).

  After releasing the holding of the gripping member 16a, as shown in FIG. 5C, the gripping member 16a is rotated downward to release the hooked state of the inner cylinder 7c from the load holding handle 17. Then, the load holding handle 17 is struck with a hammer or the like to move (slide) the load holding handle 17 toward the deep wall surfaces 18b, 19b of the pair of upper and lower load releasing recesses 18, 19, and the load holding handle 17 is moved to the load releasing recess 18, It is made to detach | leave from 19 between the shallow wall surface 18c of 19 and the recessed bottom end surface 18a, 19a by the side of 19c (from the state of (c) of FIG. 5 to the state of (d)).

In this way, when the load holding handle 17 of the inner cylinder 7c is detached from the recess bottom end surfaces 18a, 19a on the shallow wall surfaces 18c, 19c side of the pair of upper and lower load release recesses 18, 19, A pair of outer cylinders 7a. 7b approaches each other until the divided end faces 14 and 15 come into contact with each other. Specifically, the upper outer cylinder 7a descends until the divided end surface 14 of the upper outer cylinder 7a contacts the divided end surface 15 of the lower outer cylinder 7b (state shown in FIG. 5D).
As a result, the axial force (load) acting on the screwed portion between the adjusting ring 5 and the threaded portion 6a of the screw tube 6 is removed. Therefore, it is possible to perform jackdown in which the adjusting ring 5 is easily rotated by the jack handle 13 and the inner tube 2 is lowered so as to return to the outer tube 1.

  According to the load release device 7 according to the present embodiment configured as described above, as shown in FIGS. 2 and 3, a pair of upper and lower outer members arranged coaxially and connected to the lower end side of the outer tube 1. Inner cylinder 7c having cylinders 7a and 7b and a load holding handle 17 that is coaxially and rotatably fitted in both outer cylinders 7a and 7b so as to straddle the split end faces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b. It consists of and. Thereby, the number of parts is small and the structure can be simplified. Therefore, improvement in productivity of the load release device 7 and cost reduction can be expected.

In addition, as shown in FIG. 1, the threaded screw between the adjusting ring 5 and the threaded portion 6a of the pipe support A that is vertically laid from the floor B so as to support the large pulling material C of the ceiling mold or the beam mold. The axial force (load) that continues to act at the joint location even after the curing period has ended can be released by the load releasing device 7 that is coaxially disposed on the lower end side of the outer tube 1. . That is, an operation for sliding (moving) the load holding handle 17 of the inner cylinder 7c while hitting it with a hammer or the like can be performed on the lower end side of the pipe support A.
As a result, the operator hits the load holding handle 17 of the inner cylinder 7c with a hammer or the like in a stable working posture with the foot placed on the floor B on which the pipe support A is vertically leaned, and a pair of upper and lower portions by the load holding handle 17 The separated holding state of the outer cylinders 7a, 7b can be released easily and quickly.
Therefore, not only the assembly and installation of the support work but also the workability such as the disassembly of the support work has been greatly improved, and the work time when dismantling the support work can be expected to be greatly reduced. Excessive labor can be greatly reduced.

  Further, when assembling and installing the support work, a pair of upper and lower outer cylinders are provided by interposing the load holding handle 17 of the inner cylinder 7c between the notch bottom end surfaces 18a and 19a of the pair of upper and lower load release notches 18 and 19. When holding 7a and 7b in a state of being maximally separated in the axial direction, the bottom end surfaces 18a and 19a of the pair of upper and lower load release recessed portions 18 and 19 are brought into surface contact within a predetermined circumferential range. It is possible to expect a stable support work that is stably held by the pressure receiving surfaces 38 on the upper and lower surfaces of the load holding handle 17 formed in the above.

[Description of other embodiments]
FIG. 6 shows a support pipe support provided with a load releasing device according to another embodiment, (a) is a side view showing the entire pipe support, and (b) shows the load releasing device. It is a side view.
In addition, the load release apparatus 7-1 which concerns on such embodiment changes only the cylinder form of a pair of upper and lower outer cylinders 7a-1 and 7b-1, and changes the attachment position of the load release apparatus 7-1 with respect to the outer tube | pipe 1. Since the other components are basically the same as those of the above-described embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted.

That is, of the pair of upper and lower outer cylinders 7a-1 and 7b-1 constituting the load releasing device 7-1, the upper outer cylinder 7a-1 is connected to the outer pipe 1 as shown in FIG. The connecting cylinder part 20a is formed in a straight cylindrical shape having the same outer diameter and inner diameter, and the upper half side is connected to the screw tube 6. On the other hand, the lower outer cylinder 7b-1 has a connecting cylinder part 20b formed to have the same outer diameter as the inner diameter of the outer tube 1 that is slightly thinner than the upper half part side having the divided end face 15 on the lower half part side. It is formed in a stepped cylindrical shape.
Thus, as shown in FIG. 6A, the load release device 7-1 in which the cylindrical shape of the pair of upper and lower outer cylinders 7a-1 and 7b-1 is changed is the outer pipe 1 of the pipe support A-1. And the screw tube 6 attached to the upper end of the outer tube 1 are coaxially connected to each other.

The specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there are design changes and the like without departing from the gist of the present invention described in claims 1 to 5. Are also included in the present invention.
For example, in the above-described embodiment, the pair of upper and lower load release recesses are formed so that the split end faces 14 and 15 of the pair of upper and lower outer cylinders 7a and 7b are symmetrical in the vertical direction with the split end faces 14 and 15 therebetween. The notches 18 and 19 are formed. Of the pair of upper and lower load release notches 18 and 19, only the bottom end surface 18 a on one side is tapered so as to approach the divided end surface 14, and the notches on the other side are formed. The bottom end face 19 a can be parallel to the divided end face 15.
Further, the cross-sectional shape of the load holding handle 17 of the inner cylinder 7c is not a substantially trapezoidal shape having pressure receiving surfaces 38 on both upper and lower surfaces as in the above-described embodiment, but a round shape having a predetermined size (shaft diameter). It can also be.

It is a side view showing the whole pipe support for supporting works provided with the load release device concerning this embodiment. The load release apparatus which concerns on the embodiment is shown, (a) is a side view, (b) is a bb line longitudinal cross-sectional view of (a), (c) is c of (a). FIG. It is a perspective view which decomposes | disassembles and shows the load release apparatus which concerns on the same embodiment. It is a side view of the load release apparatus which concerns on the same embodiment which shows the modification of a locking mechanism. It is a side view which shows a motion of the load release apparatus when dismantling a support work, (a) is a load holding handle of an inner cylinder between the notch bottom end surfaces of the load release notch part of a pair of upper and lower outer cylinders. A state in which the pair of upper and lower outer cylinders are maximally separated in the axial direction by interposing, (b) shows a state in which the holding state of the holding member with respect to the holding member of the lock mechanism is released, (c) , (D) shows a state in which the fixed state of the load holding handle by the gripping member of the lock mechanism is released, and (d) shows a pair of upper and lower pairs by separating the load holding handle from the bottom end surfaces of the pair of upper and lower load release recesses. The state which released | separated and hold | maintained the outer cylinder is shown, and the division | segmentation end surfaces are mutually contacted. The pipe support for support provided with the load release apparatus which concerns on other embodiment is shown, (a) is a side view which shows the whole pipe support, (b) is the load release apparatus which concerns on the embodiment. FIG. It is a side view which shows the whole conventional pipe support for support works.

Explanation of symbols

A, A-1 Pipe support 1 Outer tube 2 Inner tube 3, 4 Base plate 5 Adjustment ring 6 Screw tube 6a Screw part 7,7-1 Load release device 7a, 7a-1, 7b, 7b-1 Outer tube 7c Inner tube 13 Jack handle 14, 15 Divided end face 16, 27 Lock mechanism 16a, 27a Holding member 16b Holding member 17 Load holding handle 18, 19 Load release recessed portion 18a, 19a Recessed bottom end surface 18b, 19b Deep wall surface 18c, 19c Shallow Wall surface 23 Connecting member 38 Pressure receiving surface

Claims (5)

An adjustment having a jack handle which is provided with an outer tube and an inner tube which is inserted into the outer tube so as to be extendable and slidable, and which is mounted so as to screw in and adjust an extension length of the inner tube with respect to the outer tube. With a ring,
A pipe support for a support construction provided with a load release device for releasing a load acting on the screwing screwing portion of the adjustment ring when dismantling the support construction,
A pair of upper and lower outer cylinders divided vertically in the axial direction, and an inner cylinder fitted and inserted into the outer cylinders so as to be coaxially rotatable so as to straddle the divided end surfaces of the pair of upper and lower outer cylinders,
The pair of upper and lower outer cylinders are formed so as to be fitted and connected to appropriate positions in the axial direction of the outer pipe or at the lower end side of the outer cylinder, and the split end faces are appropriately arranged in the axial direction. A pair of upper and lower load release recessed portions having a recessed bottom end surface formed at a depth;
Of the pair of upper and lower load release recesses, at least one of the recess bottom end surfaces is a tapered shape gradually inclined so as to approach the split end surface from one end side toward the other end side,
The inner cylinder includes a load holding handle that is slidably interposed in a circumferential direction between the pair of upper and lower load release recesses.
The load holding handle is interposed between the other end side of the bottom end surface of the notch of the pair of upper and lower load release notches so as to hold the pair of upper and lower outer cylinders in an axially separated state. On the other hand, the support pipe is formed so as to reduce the separation distance between the pair of upper and lower outer cylinders by being moved to the one end side along the concave bottom end surface. support.   The load holding handle is provided with pressure-receiving surfaces on both upper and lower sides that are parallel to the bottom surface of the bottom of the bottom of the bottom of the pair of load release concave and convex portions and are in contact with the bottom surface of the bottom of the bottom of the recess. The support pipe support according to claim 1, wherein the pipe support is a support structure.   A lock mechanism is provided on the circumferential side surfaces of the pair of upper and lower outer cylinders, and the load holding handle of the inner cylinder is interposed between the other end sides of the bottom end surfaces of the notched bottom portions of the pair of upper and lower load releasing recesses. The support pipe support according to claim 1 or 2, wherein the load holding handle is held at the intervening position when the load is supported.   Of the pair of upper and lower outer cylinders, the lower outer cylinder includes a base plate, and the upper outer cylinder is formed to be coaxially fitted and connected to the lower end side of the outer pipe. The support pipe support according to any one of claims 1 to 3.   The pair of upper and lower outer cylinders are connected so as to be axially spaced apart from each other or to be approached by a connecting member provided on a circumferential side surface. Pipe support for support construction as described in section.

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