A subway formwork support rod

Abstract

The utility model relates to a subway template support rod, effective solution adjustable long support rod quick adjustment and high stability difficult to take into account the problem, the technical scheme who solves includes outer pole and inner pole, the outer pole is hollow pole, and the inner pole is coaxially arranged in the outer pole from the outer pole upper end, and the inner pole can slide in the outer pole axial direction, and the upper end of outer pole is fixed with a sleeve coaxially, and the inner pole passes through the sleeve, and the inner wall of sleeve is equipped with the convex strip of spiral, and the outer wall of inner pole is opened with the spiral guide groove, and the convex strip is embedded into the guide groove, the upper end of sleeve is equipped with a ring limit disc, and the inner pole passes through the limit disc, and the outer wall of inner pole is opened with the axial slot, and the inner wall of limit disc is equipped with the convex block, and the convex block is embedded into the axial slot, and the upper end of sleeve and limit disc all have the flange hole of circumferential distribution, and the flange hole is equipped with detachable bolt, the utility model discloses through the spiral guide groove and limit disc of big lead, and the stable locking is taken into account while realizing the quick adjustment.

Description

Technical Field

[0001] This utility model relates to the field of pouring construction, specifically a subway formwork support rod. Background Technology

[0002] When setting up subway floor slab formwork, vertical support rods are needed to support the bottom of the formwork. Utility model patent application number CN201822039574.6 provides a support rod for subway station formwork. It uses a double-acting screw with threaded support tubes connected to both ends. When the double-acting screw is rotated, the two support tubes move simultaneously in opposite directions to adjust the total length of the support rod. A rotating handle is also designed to drive the double-acting screw through a bevel gear set. While this technical solution achieves length adjustment of the support rod, axial locking after adjustment requires self-locking of the double-acting screw. However, with self-locking, the lead of the thread is very small. Therefore, if a large range of length adjustment is needed, the double-acting screw needs to rotate many times, resulting in a very slow adjustment speed. Increasing the lead causes the double-acting screw to lose self-locking, relying solely on the tightening bolts at the rotating handle for locking. This results in limited load-bearing capacity, poor stability, and a high risk of support failure. In other words, the above solution fails to achieve both rapid adjustment and high stability. Summary of the Invention

[0003] This utility model provides a subway formwork support rod, which aims to solve the problem of balancing rapid adjustment and high stability of adjustable support rods.

[0004] The technical solution includes an outer rod and an inner rod. The outer rod is a hollow rod, and the inner rod is coaxially inserted into the outer rod from the upper end. The inner rod can slide axially inside the outer rod. A sleeve is coaxially fixed at the upper end of the outer rod. The inner rod passes through the sleeve. The inner wall of the sleeve is provided with a spiral protrusion. The outer wall of the inner rod is provided with a spiral guide groove. The protrusion is embedded in the guide groove.

[0005] The upper end of the sleeve is provided with an annular limiting plate, the inner rod passes through the limiting plate, the outer wall of the inner rod has an axial groove, the inner wall of the limiting plate has a protrusion, the protrusion is embedded in the axial groove, and the upper end of the sleeve and the limiting plate are both circumferentially distributed with several flange holes, and the flange holes are equipped with detachable bolts.

[0006] An adjusting block is screwed onto the upper end of the inner rod.

[0007] The adjusting block consists of a first support plate at the top and a threaded cylinder connected to the lower end of the first support plate. The outer wall of the threaded cylinder is hexagonal.

[0008] The lower end of the outer rod is provided with a second support plate.

[0009] The guide groove and the raised strip are evenly distributed in multiple sets around the circumference.

[0010] The protrusions and axial grooves are all evenly distributed in multiple sets around the circumference.

[0011] The limiting plate has no fewer than 12 flange holes.

[0012] This invention utilizes a spiral guide groove with a large lead to quickly pull the inner rod axially, thereby rapidly adjusting the support rod to the required length. By limiting the rotation of the inner rod around the axis through the limiting plate and the axial groove, the axial position of the inner rod is locked, resulting in better stability and stable load-bearing capacity during support. Therefore, this invention combines the advantages of rapid adjustment and stable locking. Attached Figure Description

[0013] Figure 1 This is the front view of the present invention.

[0014] Figure 2 This is a perspective view of the present invention.

[0015] Figure 3 This is the front sectional view of the present invention.

[0016] Figure 4 This is a three-dimensional sectional view of the present invention.

[0017] Figure 5 This is an exploded view of the present invention.

[0018] Figure 6 This is a three-dimensional view of the sleeve.

[0019] Figure 7 This is a sectional view of the sleeve. Detailed Implementation

[0020] Referring to the accompanying drawings, this utility model includes an outer rod 1 and an inner rod 2. The outer rod 1 is a hollow rod, and the inner rod 2 is coaxially inserted into the outer rod 1 from its upper end. The inner rod 2 can slide axially within the outer rod 1, and the total length of the entire support rod can be adjusted by the axial sliding of the inner rod 2. A sleeve 3 is coaxially fixed at the upper end of the outer rod 1, and the inner rod 2 passes through the sleeve 3. The inner wall of the sleeve 3 is provided with a spiral protrusion 4, and the outer wall of the inner rod 2 is provided with a spiral guide groove 5. The protrusion 4 is embedded in the guide groove 5. When the inner rod 2 slides axially relative to the sleeve 3, the spiral protrusion 4... Under the action of bar 4 and guide groove 5, inner rod 2 needs to rotate around the axis relative to sleeve 3 simultaneously. If the rotation of inner rod 2 around the axis is restricted, inner rod 2 will also be unable to move axially. That is to say, for the screw, axial locking and positioning can be achieved by restricting circumferential rotation. The protruding bar 4 and guide groove 5 are not self-locking, that is, the thread helix angle is greater than the equivalent friction angle of the screw pair. Specifically, the screw should have a large lead. For example, if the screw diameter is 10 cm, the lead should not be less than 1 meter so that the inner rod 2 can be pulled out quickly.

[0021] The upper end of the sleeve 3 is provided with an annular limiting plate 6. The inner rod 2 passes through the limiting plate 6. The outer wall of the inner rod 2 has an axial groove 7. The inner wall of the limiting plate 6 is provided with a protrusion 8, which is embedded in the axial groove 7. The inner rod 2 can move axially relative to the limiting plate 6, but cannot rotate relative to the limiting plate 6. The upper end of the sleeve 3 and the limiting plate 6 are both circumferentially distributed with several flange holes 9. The flange holes 9 are equipped with detachable bolts 10. When the bolts 10 are not installed, the limiting plate 6 can rotate synchronously with the inner rod 2, so that the inner rod 2 can be pulled axially. When the bolts 10 are installed, the limiting plate 6 can no longer rotate. Under the action of the protrusion 8 and the axial groove 7, the inner rod 2 can no longer rotate, so the inner rod 2 cannot move axially, thus locking the axial position of the inner rod 2.

[0022] An adjusting block 11 is screwed onto the upper end of the inner rod 2. Rotating the adjusting block 11 can adjust the height of the adjusting block 11. Since the bolt 10 can only be installed after the flange hole 9 on the limiting plate 6 and the sleeve 3 are aligned, the axial position of the inner rod 2 cannot be infinitely adjusted. With the infinite adjustment of the adjusting block 11, the total length of the support rod can be arbitrarily adjusted.

[0023] The adjusting block 11 consists of a first support plate 12 at the top and a threaded cylinder 13 connected to the lower end of the first support plate 12. The outer wall of the threaded cylinder 13 is hexagonal, which makes it easy to rotate the adjusting block 11 with a wrench.

[0024] The lower end of the outer rod 1 is provided with a second support plate 14 to increase the support area at the lower end of the support rod.

[0025] The guide groove 5 and the raised strip 4 are both circumferentially distributed in multiple sets, which can improve the load-bearing capacity of the inner rod 2 when it is axially locked.

[0026] The protrusions 8 and axial grooves 7 are evenly distributed in multiple sets around the circumference, which can improve the stability of the inner rod 2 in circumferential positioning.

[0027] The limiting plate 6 has no fewer than 12 flange holes 9, which gives the inner rod 2 a shorter minimum adjustment length and improves adjustment accuracy.

[0028] In use, without installing bolt 10, and with the limiting plate 6 and inner rod 2 able to rotate, the inner rod 2 is pulled axially to adjust the total length of the support rod to be slightly less than the required support height. Then, bolt 10 is inserted into flange hole 9 to fix the limiting plate 6 and sleeve 3. The limiting plate 6 can no longer move or rotate axially, and the inner rod 2 can no longer rotate. Under the action of spiral protrusion 4 and guide groove 5, the inner rod 2 can no longer move axially, and the inner rod 2 is axially locked.

[0029] Then, support the support rod vertically in the desired position, and rotate the top adjusting block 11 with a wrench to raise the adjusting block 11 until the first support plate 12 presses against the upper template.

[0030] This invention achieves both rapid adjustment and stable locking through a large-lead spiral guide groove 5 and a limiting disc 6.

Claims

1. A subway formwork support rod comprising an outer rod (1) and an inner rod (2), the outer rod (1) being a hollow rod, the inner rod (2) being coaxially arranged in the outer rod (1) from the upper end of the outer rod (1) and being axially slidable in the outer rod (1), characterized in that, A sleeve (3) is coaxially fixed at the upper end of the outer rod (1), the inner rod (2) passes through the sleeve (3), the inner wall of the sleeve (3) is provided with a spiral protrusion (4), the outer wall of the inner rod (2) is provided with a spiral guide groove (5), and the protrusion (4) is embedded in the guide groove (5). The upper end of the sleeve (3) is provided with an annular limiting plate (6), the inner rod (2) passes through the limiting plate (6), the outer wall of the inner rod (2) has an axial groove (7), the inner wall of the limiting plate (6) is provided with a protrusion (8), the protrusion (8) is embedded in the axial groove (7), and the upper end of the sleeve (3) and the limiting plate (6) are both circumferentially distributed with several flange holes (9), and the flange holes (9) are filled with detachable bolts (10).

2. A subway formwork support pole according to claim 1, wherein An adjusting block (11) is screwed onto the upper end of the inner rod (2).

3. A subway formwork support pole according to claim 2, wherein The adjustment block (11) consists of a first support plate (12) at the top and a threaded cylinder (13) connected to the lower end of the first support plate (12). The outer wall of the threaded cylinder (13) is hexagonal.

4. A subway formwork support rod according to claim 1, characterized in that, The lower end of the outer rod (1) is provided with a second support plate (14).

5. A subway formwork support rod according to claim 1, characterized in that, The guide groove (5) and the raised strip (4) are both circumferentially distributed in multiple sets.

6. A subway formwork support rod according to claim 1, characterized in that, The protrusions (8) and axial grooves (7) are evenly distributed in multiple sets around the circumference.

7. A subway formwork support rod according to claim 1, characterized in that, The limiting plate (6) has no fewer than 12 flange holes (9).

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