CN212745383U - Buried double-layer pressure steel pipe device - Google Patents
Buried double-layer pressure steel pipe device Download PDFInfo
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- CN212745383U CN212745383U CN202021199637.5U CN202021199637U CN212745383U CN 212745383 U CN212745383 U CN 212745383U CN 202021199637 U CN202021199637 U CN 202021199637U CN 212745383 U CN212745383 U CN 212745383U
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Abstract
The utility model provides a double-deck penstock device of formula of burying, it forms to connect by multisection steel pipe standard festival, each steel pipe standard festival includes the inlayer steel pipe, with the outer steel pipe of inlayer steel pipe with the central axis, inlayer steel pipe and outer steel pipe pass through the stiffening ring and connect fixedly, form penstock cavity, set up the concrete placement hole on the stiffening ring, pour the concrete through the concrete placement hole to penstock cavity and form the concrete pipe of pouring between inlayer steel pipe and outer steel pipe, connect through connecting the steel pipe between the adjacent steel pipe standard festival, the stiffening ring is located joint steel pipe department. The concrete pipe in the double-layer steel pipe enhances the rigidity of the pressure steel pipe, improves the internal and external water pressure resistance of the pressure steel pipe, and saves steel; concrete pipe between inlayer steel pipe and the outer steel pipe pours outside the tunnel, pours the quality better, and the concrete pipe receives the restraint of stiffening ring, inlayer steel pipe and outer steel pipe, and the bearing capacity obtains very big improvement.
Description
Technical Field
The utility model relates to a hydraulic and hydroelectric engineering field specifically is a double-deck penstock device of formula of burying.
Background
The buried pressure steel pipe is a steel pipe which is buried in a rock tunnel and backfilled with concrete between the outer wall of the steel pipe and surrounding rocks of the tunnel. Under the action of internal water pressure, the pipe wall is mainly hoop tensile stress, and when the internal pressure exceeds a certain value, the steel pipe is damaged due to insufficient strength, so that the wall thickness is increased, and the internal water pressure resistance of the steel pipe can be improved. When the steel pipe is emptied to be overhauled, under the action of external water pressure, the pipe wall is mainly subjected to hoop compressive stress, the steel pipe is easy to buckle and destabilize due to insufficient rigidity, and the external water pressure is usually resisted in the following modes except that the external water pressure is reduced: (1) the wall thickness is increased, and the pressure steel pipe is designed to be a smooth surface buried type pressure steel pipe; (2) and the outer wall of the steel pipe is provided with a stiffening ring, and the wall thickness of the steel pipe and the spacing between the stiffening rings are adjusted according to calculation. Through economic comparison, one of the suitable schemes is selected, when the pipe diameter is larger and the external pressure is higher, the effect of arranging the stiffening rings is obvious, the intervals of the steel pipe stiffening rings are encrypted along with the increase of the external pressure, during the manufacturing, the welding seams of the stiffening rings are more, and during the installation, the backfill concrete is not easy to fill the gaps among the stiffening rings, so that the joint stress of the steel pipe and the backfill concrete is influenced.
The invention patent CN1317522C adopts a combined pipe-burying mode to resist external water pressure: a layer of steel pipe is additionally arranged between the existing concrete pipe and the surrounding rock to form an arrangement pattern of the surrounding rock, the outer layer of steel pipe, the concrete pipe and the inner layer of steel pipe. The design scheme of the combined steel pipe for bearing the internal and external water pressures provided by the invention is economical and reasonable, and the patent mainly analyzes the principle of combined stress. However, in practical engineering applications, the patent needs to be further improved: (1) when the steel pipe is installed in the tunnel, the welding of the inner steel pipe is finished in the pipe, the welding of the outer steel pipe can only be finished in the space between the outer steel pipe and the surrounding rock, the outer steel pipe is not in contact with the surrounding rock, the welding space must be reserved between the outer steel pipe and the surrounding rock, and therefore the tunnel excavation size is larger than that of the single-layer steel pipe. (2) Concrete pipes are poured between the inner wall and the outer wall of the steel pipe, and due to errors in manufacturing, installation and the like, the double-layer steel pipe is easier to dislocate when being compared with single-layer steel pipe butting, and the double-layer steel pipe is higher in rigidity and difficult to adjust due to dislocation. (3) After the butt welding of the inner layer steel pipe and the outer layer steel pipe is finished, a gap between the ends of the concrete pipes in the steel pipes is a weak stress link of the double-layer steel pipes.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a buried double-layer pressure steel pipe device with good stress and easy installation.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
the utility model provides a double-deck penstock device of formula of burying, form by connecting the multisection steel pipe standard festival, each steel pipe standard festival includes the inlayer steel pipe, with the outer steel pipe of inlayer steel pipe with the central axis setting, inlayer steel pipe and outer steel pipe pass through the stiffening ring and connect fixedly, form the penstock cavity, set up the concrete placement hole on the stiffening ring, pour the concrete formation to penstock cavity through the concrete placement hole and pour the concrete pipe between inlayer steel pipe and outer steel pipe, connect through connecting the steel pipe between the adjacent steel pipe standard festival, the stiffening ring is located the steel pipe that connects department.
Further, the standard section length of the steel pipe is 3 m.
Furthermore, the distance between the stiffening ring and the end opening of the joint steel pipe is 200mm, the height of the stiffening ring is 200mm, and the thickness of the stiffening ring is 20 mm.
Furthermore, the outer wall of the joint steel pipe at the starting end of the steel pipe of the embedded double-layer pressure steel pipe device is welded with a water-blocking ring, and the outer wall of the joint steel pipe at the tail end of the steel pipe is welded with a thrust ring.
The utility model discloses a structure has following advantage:
(1) the concrete pipe between the inner steel pipe and the outer steel pipe is poured outside the tunnel, the pouring quality is good, the concrete pipe is restrained by the stiffening ring, the inner steel pipe and the outer steel pipe, and the bearing capacity is greatly improved;
(2) the concrete pipe in the double-layer steel pipe enhances the rigidity of the pressure steel pipe, improves the internal and external water pressure resistance of the pressure steel pipe and saves steel;
(3) steel pipes can be welded in the tunnel, so that the tunnel excavation size is reduced, and the investment is saved;
(4) the double-layer steel pipe only sets up the stiffening ring in the joint steel pipe department of standard festival, and the stiffening ring is small in quantity, has reduced the degree of difficulty of pouring of backfilling concrete.
Drawings
FIG. 1 is a schematic structural view of the buried double-layer penstock device of the present invention;
FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1.
In the figure: the concrete-filled steel pipe comprises the following components, by weight, 1-surrounding rock, 2-backfilled concrete, 3-concrete pipes, 4-outer-layer steel pipes, 5-joint steel pipes, 6-inner-layer steel pipes, 7-stiffening rings, 8-concrete pouring holes, 9-inner wall of the steel pipe, 10-steel pipe section lines and 11-steel pipe standard sections.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, an embodiment of the present invention provides an embedded double-layer penstock device, which is formed by connecting a plurality of steel pipe standard joints 11, each steel pipe standard joint 11 includes an inner steel pipe 6, an outer steel pipe 4 disposed with the inner steel pipe 6 and having the same central axis, and a concrete pipe 3 poured between the inner steel pipe 6 and the outer steel pipe 4, the inner steel pipe 6 and the outer steel pipe 4 are connected and fixed by a stiffening ring 7 to form a penstock cavity; the stiffening ring 7 is provided with a concrete pouring hole 8, and when concrete is poured, the stiffening ring 7 is used as a template. The adjacent steel pipe standard joints 11 are connected through the joint steel pipe 5, and the stiffening ring 7 is positioned at the joint steel pipe 5. Because the double-layer steel pipe is only provided with the stiffening ring 7 at the joint steel pipe 5 of the steel pipe standard joint 11, the number of the whole stiffening ring 7 is small, and the pouring difficulty of the backfilled concrete is reduced.
The double-layer pressure steel pipe is manufactured in a factory or a temporary processing factory in a construction site, the standard steel pipe joints 11 are about 3m long, and the concrete pipes 3 between the inner-layer steel pipes 6 and the outer-layer steel pipes 4 of the standard joints can be cast in situ through the concrete casting holes 8 in order to reduce the transportation weight during the factory manufacturing. And (3) transporting the standard knot into a hole for installation, adjusting the steel pipe to be accurately positioned, welding the steel pipe in the pipe, backfilling concrete (such as backfilled concrete 2 in figure 1) between the steel pipe and the surrounding rock 1 after the steel pipe is installed for a certain distance, and finally completing the installation of the steel pipe.
Preferably, the outer wall of the joint steel pipe 5 at the starting end of the steel pipe is welded with a water-blocking ring, and the outer wall of the joint steel pipe 5 at the tail end of the steel pipe is welded with a thrust ring.
Taking a steel pipe with the diameter of 4m as an example, Q345R is selected as steel, the distance between a stiffening ring 7 and the end port of a joint steel pipe 5 is 200mm, the wall thickness of the joint steel pipe 5 is 30mm, the height of the stiffening ring 7 is 200mm, the thickness of the stiffening ring is 20mm, only the participation of the end steel pipe and the stiffening ring 7 in stress is considered, 380m of external water head can be borne according to standard calculation, and according to experience, when finite element calculation and analysis are adopted, a combined stress structure is considered, and the calculated critical external pressure is higher.
The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a double-deck penstock device of embedded, its characterized in that: form by connecting multisection steel pipe standard festival, each steel pipe standard festival includes inlayer steel pipe (6), with outer steel pipe (4) of inlayer steel pipe (6) with the central axis setting, inlayer steel pipe (6) and outer steel pipe (4) are connected fixedly through stiffening ring (7), form the pressure steel pipe cavity, set up concrete placement hole (8) on stiffening ring (7), pour concrete to the pressure steel pipe cavity through concrete placement hole (8) and form concrete pipe (3) of pouring between inlayer steel pipe (6) and outer steel pipe (4), connect through connecting steel pipe (5) between the adjacent steel pipe standard festival, stiffening ring (7) are located joint steel pipe (5) department.
2. The buried double-layer penstock device of claim 1, characterized in that: the standard section length of the steel pipe is 3 m.
3. The buried double-deck penstock device of claim 1 or 2, characterized in that: the distance between the stiffening ring (7) and the port of the joint steel pipe (5) is 200mm, and the height of the stiffening ring (7) is 200mm and the thickness is 20 mm.
4. The buried double-layer penstock device of claim 1, characterized in that: the outer wall of the steel pipe initial end joint steel pipe (5) of the embedded double-layer pressure steel pipe device is welded with a water-blocking ring, and the outer wall of the steel pipe tail end joint steel pipe (5) is welded with a thrust ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021199637.5U CN212745383U (en) | 2020-06-24 | 2020-06-24 | Buried double-layer pressure steel pipe device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021199637.5U CN212745383U (en) | 2020-06-24 | 2020-06-24 | Buried double-layer pressure steel pipe device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212745383U true CN212745383U (en) | 2021-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021199637.5U Active CN212745383U (en) | 2020-06-24 | 2020-06-24 | Buried double-layer pressure steel pipe device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212745383U (en) |
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2020
- 2020-06-24 CN CN202021199637.5U patent/CN212745383U/en active Active
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