JPH032606Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates particularly to improving the load-bearing performance of pipe supports used in temporary construction work.

[Prior Art] As shown in FIG. 2, a pipe support consists of a waist pipe 2 having a base plate 1 and an insertion pipe 4 having a receiving plate 3.
This is a height-adjustable temporary steel pipe that can be moved up and down and inserted into the pipe so that it can be fixed at a desired height.

Regarding the height adjustment structure, an adjustment screw 5 is provided in the upper part of the waist tube 2, and an adjustment pedestal 6 is screwed into the adjustment screw 5. Further, as shown in the figure, a vertically elongated adjustment hole 7 is formed in the adjustment screw 5, and a support pin 8 can be inserted therethrough.

The insertion tube 4 has a structure in which a plurality of pin holes 9 are formed, and after being fitted into the waist tube 2, a support pin 8 is inserted into the pin hole 9 and supported by the adjustment base 6. Reference numeral 10 is a cap for stabilizing the insertion tube 4, which prevents the insertion tube 4 from shaking, and also serves to prevent the insertion tube 4 from shaking.
Efforts are being made to prevent concrete, etc. from entering the interior.

[Problem to be solved by the invention] By the way, the load test of such a pipe support is conducted at the maximum usable length of the pipe support, that is, when the insertion pipe 4 is moved up the most, and the center of the receiving plate 3 and the base plate 1 and the pressure are applied. This is done by aligning the centers of the pressure plates of the testing machine, applying a compressive load, and determining the load value until failure.

Therefore, if we observe the process from the beginning of load application to failure, we can see that in the pipe support, under a certain amount of load, the insertion pipe 4 and the waist pipe 2 receive the load in a straight pipe state, but when the load is It was confirmed that as the load increases, the plug-in tube 4 comes to support the load in a doglegged manner, and the load-bearing performance deteriorates rapidly, and eventually the plug-in tube 4 bends significantly.

The purpose of this invention is to provide a pipe support with improved load carrying capacity.

[Problem for Solving the Problem] From the above test, it was found that in the case of pipe supports, the strength of the insertion pipe 4 is more important than the waist pipe 2 in the process up to failure.
In other words, we have found that by increasing the strength of the insertion pipe 4, the load bearing capacity of the entire pipe support can be greatly improved.

In addition, the load received from the formwork etc. is transmitted to the adjustment pedestal 6 via the support pin 8 inserted into the pin hole 9 of the insertion tube 4, and reaches the waist tube via the adjustment screw 5 screwed into the adjustment pedestal 6. In particular, the applied load causes an extremely large shearing force and bending moment to act on the support pin 8. That is, since the support pin 8 receives a load at the part inserted into the pin hole 9 and is supported by a kind of beam structure that receives a reaction force on the adjustment base 6,
The load acting on the support pin 8 becomes a concentrated load at the portion inserted into the pin hole 9, that is, at two points, and the load distribution on the support pin 8 is significantly biased, resulting in a state where the support pin 8 is subjected to a bending action.

Therefore, in order to create a support structure that is less susceptible to bending action, the vertical load received by the support pin 8 must be transferred to the support pin 8.
By dispersing it as much as possible, load-bearing properties can be improved.

This idea is based on the above point of view, and the insertion tube is a double tube consisting of an inner tube and an outer tube, the diameter of the inner tube is about half that of the outer tube, and the upper end of each of the outer tube and the inner tube is are separately and independently fixed directly to the receiving plate,
In addition, a configuration is adopted in which at least both upper and lower ends of the outer tube are constricted and the constricted portions are pressed against the inner tube.

[Function] Therefore, since the insertion tube is a double tube consisting of an inner tube and an outer tube, the strength of the insertion tube itself is improved, and the diameter of the inner tube is about half that of the outer tube, and the diameter of the outer tube is about half that of the outer tube. By adopting a structure in which each upper end of the inner tube is directly fixed to the receiving plate separately and independently, the strength of the receiving plate itself is improved, and in addition, the load that the insertion tube receives from the receiving plate is divided between the inner tube and the outer tube. It is almost evenly distributed on both sides of the tube. That is, the load received from the receiving plate is applied to the upper ends of the inner tube and outer tube, which are arranged at approximately equal intervals, thereby distributing the load and increasing the strength of the receiving plate and the insertion tube.

Moreover, the present invention adopts a configuration in which at least both the upper and lower ends of the outer tube are constricted and the constricted portions are pressed against the inner tube, so that the diameter of the inner tube is approximately half that of the outer tube as described above, and The structure in which the upper ends of the outer tube and the inner tube are individually and directly attached to the receiving plate prevents the inner tube itself from swinging as much as possible, thereby improving the load resistance.

Furthermore, since the insertion tube is a double-walled tube with the diameter of the inner tube being approximately half that of the outer tube, the load applied to the support pin 8 is distributed and received at four approximately equal points, and the bending effect on the support pin is to prevent
Achieves increased load capacity.

In this way, the pipe support of this invention has a structure that distributes the load received by the insertion pipe as much as possible.

[Embodiment] FIG. 1 is a partially omitted cross-sectional view of an insertion pipe showing an embodiment of the pipe support according to the invention.

In the figure, 3 is a receiving plate with the same reference numerals as described above;
4 is an insertion tube. The insertion tube 4 is the inner tube 4a.
and an outer tube 4b, and an inner tube 4a.
As shown in the figure, the diameter of the tube is approximately 1/2 that of the outer tube.

Each upper end of the inner tube 4a and the outer tube 4b is connected to a receiving plate 3.
Both upper and lower ends of the outer tube 4b are drawn by direct welding, and the drawn portions 11 are pressed against the inner tube. Note that 9 is a pin hole formed in the outer tube 4b, and 9' is a pin hole formed in the outer tube 4b.
is a pin hole formed in the inner tube 4a.

Therefore, when the insertion tube 4 according to this embodiment is inserted into the waist tube 2, the compressive load from the formwork etc. via the receiving plate 3 is applied almost equally to both the inner tube 4a and the outer tube 4b. The load is distributed, and furthermore, the load is applied almost equally at four points on the support pin 8 and transmitted onto the adjustment base 6. Moreover, even when a large load is applied, the inner tube does not sway, and the strength of the receiving plate itself is increased, so the load bearing capacity of the support as a whole is improved.

However, this invention is not limited to the above embodiment. For example, although the constricted portions 11 are formed at both the upper and lower end portions in this embodiment, they may be formed at the intermediate portion.

Incidentally, as a result of a compressive load test using the pipe support of this example, a significant increase in strength of 50 to 60% was achieved compared to a conventional single pipe. In particular, the greater the maximum length of the pipe support, the more remarkable the improvement in strength was achieved.

[Effects of the invention] As described above, this invention is based on the knowledge that the improvement in the load bearing capacity of a pipe support lies in increasing the strength of the insertion pipe. Moreover, since the pipe support has a double inner and outer pipe structure that distributes the load on the support pins, we were able to create a pipe support with significantly improved load-bearing performance.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view of an insertion pipe showing an embodiment of the pipe support according to the invention, and FIG. 2 is a side view of the pipe support. 1...base plate, 2...lumbar tube, 3...receiver plate, 4...
...Plug-in pipe, 4a...Inner pipe, 4b...Outer pipe,
9, 9'...pin hole, 11...diaphragm part.

Claims (1)

[Scope of utility model registration request] The insert tube has a receiving plate at its upper end, and has a plurality of pin holes passing through it, and the lower end of the waist tube into which this insert tube is inserted has a base plate, and a cap is fitted to its upper end. The upper part of the tube is provided with an adjustment screw having a vertically extending adjustment hole and an adjustment pedestal screwed onto this adjustment screw. In the pipe support that supports the pipe, the above-mentioned insertion pipe is a double pipe consisting of an inner pipe and an outer pipe,
The diameter of the inner tube is approximately half that of the outer tube, the upper ends of the outer tube and the inner tube are separately and independently fixed directly to the receiving plate, and at least both upper and lower ends of the outer tube are squeezed. A pipe support characterized by being pressed against an inner pipe.