A combined structure high-pressure water transmission pipe and its construction method

Abstract

The present invention discloses a composite structure high-pressure water pipe and a construction method thereof, wherein the composite structure high-pressure water pipe comprises a steel cylinder, annular stress-bearing steel bars, concrete and a steel bar fixing part. The steel cylinder is arranged inside the excavation boundary line, the steel bar fixing part is fixed on the surface of the steel cylinder, the annular stress-bearing steel bars are connected to the steel bar fixing part, the steel bar fixing part is staggered in the axial direction, the concrete fills the space between the excavation boundary line and the steel cylinder, and the steel cylinder has an annular joint, which is welded by an inner single-sided groove welding. The present invention can share the annular pressure on the steel cylinder by arranging annular stress-bearing steel bars. At the same time, the steel bar fixing part of the present invention can act as an anchoring member, which can effectively bond the steel cylinder and concrete, ensure that the radial axial force can be effectively transmitted from the concrete to the steel cylinder, and improve the strength of the structure of the present invention. The annular joint of the steel cylinder of the present invention adopts an inner single-sided groove welding, which is convenient for construction in the cavern and can reduce construction costs and construction period.

Description

Technical Field

[0001] The present invention belongs to the field of pressure pipes, and in particular relates to a combined structure high-pressure water pipe and a construction method thereof. Background Art

[0002] In the current construction of pumped-storage power stations, high-pressure steel pipes are a common structure in the water supply system of high-head power stations. The existing penstock structure mainly uses concrete backfill on the outside of the steel cylinder. The pressure on existing high-pressure water pipes is mainly borne by the steel cylinder, and the concrete outside the steel cylinder is mainly used to fill the gaps. Because existing technology only uses a steel cylinder structure, the required steel cylinder thickness is relatively large. The circumferential joints of the existing high-pressure water pipe steel cylinder are double-sided bevel welded. Due to the limited on-site construction space, the outer welds are not only slow to install but also difficult to ensure construction quality. This results in a significant consumption of construction resources and increases in construction costs and construction time. Summary of the Invention

[0003] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a composite structure high-pressure water pipe and its construction method, by arranging circumferential stress-bearing steel bars to share part of the circumferential pressure for the steel cylinder, and adopting an inner single-sided groove welding circumferential seam, thereby reducing resource consumption and shortening the construction period.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a composite structure high-pressure water pipe, including a steel cylinder, circumferential stress-bearing steel bars, concrete and steel bar fixings; wherein, the steel cylinder is arranged on the inner side of the excavation boundary line, the steel bar fixings are fixed on the surface of the steel cylinder, the circumferential stress-bearing steel bars are connected to the steel bar fixings, the steel bar fixings are staggered in the axial direction, the concrete fills the space between the excavation boundary line and the steel cylinder, the steel cylinder has a circumferential seam, and the circumferential seam is welded by an inner single-sided groove welding.

[0005] Optionally, the steel cylinder includes an outer steel cylinder and an inner steel cylinder, wherein the outer steel cylinder is arranged on the outside of the inner steel cylinder; the steel bar fixing piece includes an outer steel bar fixing piece and an inner steel bar fixing piece, the outer steel bar fixing piece is fixed on the inner surface of the outer steel cylinder, and the inner steel bar fixing piece is fixed on the outer surface of the inner steel cylinder.

[0006] Optionally, the outer steel bar fixing members and the inner steel bar fixing members are arranged alternately in the ring direction.

[0007] Optionally, the concrete includes backfill concrete and lining concrete, the backfill concrete fills the space between the excavation boundary line and the outer steel cylinder, and the lining concrete fills the space between the outer steel cylinder and the inner steel cylinder.

[0008] Optionally, consolidation and backfill grouting holes are provided on the outer steel cylinder, and a grouting pipe is provided on the excavation boundary line.

[0009] Optionally, the outer steel cylinder has an outer steel cylinder circumferential seam, and the inner steel cylinder has an inner steel cylinder circumferential seam, and the outer steel cylinder circumferential seam and the inner steel cylinder circumferential seam are staggered in the radial direction.

[0010] Optionally, the annular stress-bearing steel bars are single-layer steel bars or double-layer steel bars, and the steel bar fixing members are steel bar heads, bolts or ear plates.

[0011] Optionally, the concrete is micro-expansive concrete, fiber concrete or micro-expansive fiber concrete.

[0012] Optionally, the annular stressed steel bars and the steel bar fixings are connected by binding.

[0013] A construction method for a combined structure high-pressure water pipe, characterized by comprising the following steps:

[0014] Welding the steel bar fixing piece to the outside of the inner steel cylinder, welding the steel bar fixing piece to the inside of the outer steel cylinder, and fixing the circumferential stress-bearing steel bars on the steel bar fixing piece;

[0015] Installing the outer steel cylinder;

[0016] Filling the backfill concrete between the excavation boundary line and the outer steel cylinder;

[0017] Installing the inner steel cylinder;

[0018] The lining concrete is filled between the inner steel cylinder and the outer steel cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention can share the circumferential pressure on the steel cylinder by arranging circumferential stress-bearing steel bars on the steel bar fixing parts, thereby reducing the required thickness of the steel cylinder, saving materials and improving strength. At the same time, the steel bar fixing parts of the present invention can act as anchoring components, effectively bonding the steel cylinder and concrete, ensuring that the radial axial force can be effectively transferred from the concrete to the steel cylinder, improving the strength of the structure of the present invention, and saving the amount of concrete. At the same time, the circumferential joints of the present invention adopt an inner single-sided groove welding, which can be welded only from the inside, solving the problem of construction difficulties caused by the narrow welding space on the outside, and facilitating actual construction. The structure of the present invention can save the required thickness of the steel cylinder and the amount of concrete, and can be constructed from the inside, which can complete the construction faster.

[0021] Furthermore, the present invention provides grouting pipes on the excavation boundary and the outer steel cylinder, facilitating grouting from both the inside and outside of the concrete. The present invention employs a double steel cylinder structure, eliminating the need for construction outside the steel cylinder, reducing the size of the cavern excavation and saving on both the cavern excavation volume and the thickness of the backfill concrete.

[0022] Furthermore, the present invention adopts a double steel cylinder structure, which reduces the mass of a single cylinder compared to a single steel cylinder structure, and the length of a single steel cylinder can be increased, thereby reducing the total amount of circumferential joints and shortening the construction period.

[0023] Furthermore, the staggered arrangement of the outer steel bar fixings and the inner steel bar fixings of the present invention can enable the inner steel bar fixings to withstand more radial axial forces, thereby improving the structural strength of the present invention and reducing the thickness of the inner steel tube and the lining concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the longitudinal section structure of the present invention;

[0027] Figure 3 This is a three-dimensional schematic diagram of a single-section outer steel cylinder of the present invention;

[0028] Figure 4 This is a three-dimensional schematic diagram of a single-section inner steel cylinder of the present invention;

[0029] Figure 5 It is a schematic diagram of the circumferential single-sided groove welding of the present invention.

[0030] Among them, 1—backfill concrete; 2—outer steel cylinder; 3—lining concrete; 4—inner steel cylinder; 5—excavation boundary line; 6—rebar fixings; 7—circumferential stress-bearing reinforcement; 8—circumferential joint of outer steel cylinder; 9—circumferential joint of inner steel cylinder. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0032] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The present invention will be described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 — Figure 4 As shown, a composite structure high-pressure water pipe of the present invention includes concrete, a steel cylinder, an excavation boundary line 5, a steel bar fixing part 6 and annular stressed steel bars 7. A grouting pipe is provided on the excavation boundary line 5, and a steel cylinder is provided inside the excavation boundary line 5. The steel cylinder includes an outer steel cylinder 2 and an inner steel cylinder 4. The outer steel cylinder 2 is provided on the inner side of the excavation boundary line 5, and the inner steel cylinder 4 is provided on the inner side of the outer steel cylinder 2. Due to the adoption of a double steel cylinder structure, the thickness of the outer steel cylinder 2 and the inner steel cylinder 4 is reduced compared to the structure, and the weight is reduced. The length of a single steel cylinder can be increased, thereby reducing the number of annular joints. The outer steel cylinder 2 is provided with a consolidation and backfill grouting hole, and the consolidation and backfill grouting hole can be used to grout the outer concrete and surrounding rock cracks from the inside of the outer steel cylinder 2 to increase the structural strength. The outer steel cylinder 2 and the inner steel cylinder 4 both have annular joints, and both adopt the following method: Figure 5 The illustrated inside single-sided groove weld has a groove that gradually decreases in size from the inside of the pipe to the outside. This allows welding to be performed solely from the inside of the steel tube, resolving the problem of limited welding space on the outside. The outer steel tube 2 has an outer steel tube circumferential seam 8, and the inner steel tube 4 has an inner steel tube circumferential seam 9. These outer and inner steel tube circumferential seams 8 and 9 are staggered in the axial direction, avoiding overlapping hazardous locations.

[0036] The concrete is micro-expansive concrete, fiber concrete, or micro-expansive fiber concrete. The concrete includes backfill concrete 1 and lining concrete 3. The backfill concrete 1 fills the gap between the excavation boundary 5 and the outer steel cylinder 2, and the lining concrete 3 fills the gap between the inner steel cylinder 4 and the outer steel cylinder 2.

[0037] A plurality of rebar fixings 6 are circumferentially fixed to the surface of the steel cylinder. These rebar fixings 6 include outer and inner rebar fixings. The outer rebar fixings are fixed to the inner surface of the outer steel cylinder 2, while the inner rebar fixings are fixed to the outer surface of the inner steel cylinder 4. These rebar fixings 6 are constructed in the form of studs or lugs, serving as anchors between the outer steel cylinder 2 and the backfill concrete 1, and between the inner steel cylinder 4 and the lining concrete 3. The circumferential stress-bearing reinforcement 7 is connected to the rebar fixings 6 by tying, and the circumferential stress-bearing reinforcement 7 can be single-layer or double-layered.

[0038] Example

[0039] In this embodiment, the excavation boundary line 5 is the surrounding rock boundary of the water conveyance cavern rock wall.

[0040] A construction method of a combined structure high-pressure water pipe of the present invention comprises the following steps:

[0041] First, clean the excavation boundary line 5 of the surrounding rock and reserve a grouting pipe on the rock wall of the excavation boundary line 5;

[0042] The steel bar fixing piece 6 is welded on the inner side of the outer steel cylinder 2 and the outer side of the inner steel cylinder 4 , and the circumferential stress-bearing steel bars 7 are welded on the steel bar fixing piece 6 .

[0043] Then, the outer steel cylinder 2 is installed in the excavation boundary line 5 of the surrounding rock, using Figure 5 The inner single-sided groove welding shown is used to weld the outer steel cylinder circumferential seam 8.

[0044] After the outer steel cylinder 2 is installed for 12 m, the backfill concrete 1 is poured between the excavation boundary line 5 and the outer steel cylinder 2, so that the backfill concrete 1 fills the gap between the excavation boundary line 5 and the outer steel cylinder 2; after the backfill concrete 1 solidifies, grouting is performed through the grouting pipe and the consolidation and backfill grouting holes on the outer steel cylinder 2. After the grouting is completed, the consolidation and backfill grouting holes are sealed;

[0045] After the plugging is complete, the inner steel cylinder 4 is installed inside the outer steel cylinder 2, fixed at the center of the outer steel cylinder 2. The inner steel cylinder circumferential seam 9 is welded using an internal single-sided groove weld. The outer steel cylinder circumferential seam 8 and the inner steel cylinder circumferential seam 9 are arranged crosswise in the axial direction. Finally, lining concrete 3 is poured between the outer steel cylinder 2 and the inner steel cylinder 4, completing the installation of this section of the composite structure high-pressure water pipe and starting the installation of the next section of the composite structure high-pressure water pipe.

[0046] The outer steel cylinder 2 can be a pre-fabricated outer steel cylinder, to which a steel bar fixing member 6 is welded, and to which a circumferential stress-bearing steel bar 7 is welded. When the inner steel cylinder 4 is installed in the current section of the composite structure high-pressure water pipe, the pre-fabricated outer steel cylinder of the next section of the composite structure high-pressure water pipe can be installed at the same time.

[0047] Unless otherwise specified, the device components involved in the above embodiments are all conventional device components, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A combined structure high-pressure water pipe, characterized in that: It comprises a steel cylinder, annular stress-bearing steel bars (7), concrete and a steel bar fixing member (6); wherein the steel cylinder is arranged inside the excavation boundary line (5), the steel bar fixing member (6) is fixed on the surface of the steel cylinder, the annular stress-bearing steel bars (7) are connected to the steel bar fixing member (6), the steel bar fixing members (6) are staggered in the axial direction, the concrete fills the space between the excavation boundary line (5) and the steel cylinder, the steel cylinder has an annular joint, and the annular joint is welded by inner single-sided groove welding; The steel cylinder comprises an outer steel cylinder (2) and an inner steel cylinder (4), wherein the outer steel cylinder (2) is arranged outside the inner steel cylinder (4); the steel bar fixing member (6) comprises an outer steel bar fixing member and an inner steel bar fixing member, wherein the outer steel bar fixing member is fixed to the inner surface of the outer steel cylinder (2), and the inner steel bar fixing member is fixed to the outer surface of the inner steel cylinder (4); The outer steel bar fixing members and the inner steel bar fixing members are arranged alternately in the ring direction; The outer steel cylinder (2) has an outer steel cylinder annular seam (8), and the inner steel cylinder (4) has an inner steel cylinder annular seam (9). The outer steel cylinder annular seam (8) and the inner steel cylinder annular seam (9) are staggered in the radial direction.

2. The combined structure high-pressure water pipe according to claim 1, characterized in that: The concrete comprises backfill concrete (1) and lining concrete (3), wherein the backfill concrete (1) fills the space between the excavation boundary line (5) and the outer steel cylinder (2), and the lining concrete (3) fills the space between the outer steel cylinder (2) and the inner steel cylinder (4).

3. The combined structure high-pressure water pipe according to claim 1, characterized in that: The outer steel cylinder (2) is provided with a consolidation and backfill grouting hole, and the excavation boundary line (5) is provided with a grouting pipe.

4. The combined structure high-pressure water pipe according to claim 1, characterized in that: The annular stress-bearing steel bars (7) are single-layer steel bars or double-layer steel bars, and the steel bar fixing members (6) are steel bar heads, bolts, or ear plates.

5. The combined structure high-pressure water pipe according to claim 1, characterized in that: The concrete is micro-expansive concrete, fiber concrete or micro-expansive fiber concrete.

6. The combined structure high-pressure water pipe according to claim 1, characterized in that: The annular stressed steel bars (7) and the steel bar fixing members (6) are connected by binding.

7. The construction method of the combined structure high-pressure water pipe according to claim 2, characterized in that: The following steps are involved: 1) Welding the steel bar fixing piece (6) to the outside of the inner steel cylinder (4), welding the steel bar fixing piece (6) to the inside of the outer steel cylinder (2), and fixing the circumferential stress-bearing steel bar (7) to the steel bar fixing piece (6); 2) installing the outer steel cylinder (2); 3) filling the backfill concrete (1) between the excavation boundary line (5) and the outer steel cylinder (2); 4) Installing the inner steel cylinder (4); 5) Filling the lining concrete (3) between the inner steel cylinder (4) and the outer steel cylinder (2).

Images