Water inlet and outlet structure on soft foundation

Abstract

A water inlet and outlet structure on a soft foundation comprises a water inlet channel section and an inlet section, the water inlet channel section forms a main inflow channel through a water inlet channel bottom plate with a slope and water inlet side walls, the water inlet side walls are arranged on the left side and the right side of the water inlet channel bottom plate, and a top supporting beam, a supporting and vortex preventing beam and a top vortex preventing beam are arranged on the tops of the water inlet side walls. Wing walls and wing plates are arranged on the outer walls of the water inlet side walls, an inlet section is arranged on the rear portion of the water inlet canal section and composed of an inlet bottom plate and inlet side walls, the inlet side walls are arranged on the two sides of the inlet bottom plate, a breast wall is arranged between the inlet side walls on the left side and the right side, and an inlet top plate is arranged below the breast wall. The top supporting beam serves as an important stress structure between the water inlet side walls on the left side and the right side, is pulled under the normal operation working condition and is pressed under the overhaul working condition, and meanwhile, in order to solve the anti-floating problem under the extremely unfavorable working condition, wing walls and wing plate structures extending outwards are arranged on the water inlet side walls so that the outer water floating force can be balanced through soil weights on the wing walls and the wing plate structures.

Description

Technical Field

[0001] This utility model relates to an inlet / outlet structure on a soft foundation, belonging to the field of water conservancy and hydropower engineering technology. Background Technology

[0002] In hydraulic structures, the inlet is an essential structure in the water conveyance system. Its type can be divided into the inlet of conventional power stations and the inlet / outlet of pumped storage power stations according to the power station type. Since the inlet / outlet of pumped storage power stations has both water intake and water discharge requirements, the structural requirements are high. The inlet / outlet of pumped storage power stations is divided into side inlet / outlet and vertical shaft inlet / outlet. Inlet / outlet on soft foundation is rarely involved. Conventional side inlet / outlet is not suitable for situations where the dead water level is low or the mountain where the inlet is located is thin. Vertical shaft inlet / outlet is difficult to excavate for soil foundation. Therefore, there is an urgent need to consider a new type of inlet / outlet structure that can simultaneously meet the requirements for the burial depth of the inlet / outlet, while having relatively low construction difficulty. It can also meet the high requirements of pumped storage power stations for both inlet and outlet conditions, as well as meet the anti-buoyancy and anti-sliding stability requirements in the presence of groundwater, without causing significant settlement problems, and ensuring stable flow without air ingress. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an inlet / outlet structure on a soft foundation that meets the requirements of low construction difficulty, structural functionality, anti-buoyancy and anti-slip safety, adaptability to low dead water levels, and stability of inlet and outlet flow.

[0004] The technical solution of the inlet and outlet structure on soft soil according to this utility model is as follows: it includes an inlet channel section and an inlet section. The inlet channel section consists of a sloping inlet channel bottom plate and an inlet side wall forming the main inlet channel. Inlet side walls are set on the left and right sides of the inlet channel bottom plate. A top support beam, a support and anti-vortex beam, and a top anti-vortex beam are set on the top of the inlet side wall. A wing wall and a wing plate are set on the outer wall of the inlet side wall. An inlet section is set at the rear of the inlet channel section. The inlet section consists of an inlet bottom plate and an inlet side wall. Inlet side walls are set on both sides of the inlet bottom plate. A breast wall is set between the left and right inlet side walls. An inlet top plate is set under the breast wall.

[0005] Furthermore, a transition section is provided at the rear of the inlet section, a non-removable template is provided within the transition section, and a water diversion tunnel is provided at the rear of the transition section.

[0006] Furthermore, a trash rack is installed between the imported base plate and the breast wall.

[0007] Furthermore, the water inlet channel section is provided with structural joints along the longitudinal direction, the surface of the structural joints is covered with a surface waterproofing layer, and a PVC waterproofing strip is installed inside the structural joints.

[0008] Furthermore, a layer of crushed stone is provided on the outside of the structural joint, and a non-removable steel mesh template is provided on the outside of the crushed stone layer. The non-removable steel mesh template is wrapped with geotextile.

[0009] Furthermore, the bottom of the inlet channel bottom plate is provided with toothed grooves.

[0010] Furthermore, a layer of concrete is provided at the bottom of the inlet channel slab.

[0011] Furthermore, a geomembrane is installed around the water intake section and the inlet section, and the geomembrane is fixed to the water intake section and the inlet section by anchor bolts.

[0012] Furthermore, a guide pier is installed in the middle of the inlet section.

[0013] The beneficial effects of this utility model of an inlet / outlet structure on a soft foundation are as follows: the top support beam is used as an important load-bearing component between the left and right inlet sidewalls. It is under tension under normal operating conditions and under compression under maintenance conditions. In order to meet the anti-buoyancy problem under extremely unfavorable conditions, outwardly extending wing walls and wing plate structures are set on the inlet sidewalls to use the weight of the soil on them to balance the buoyancy force of the external water. In addition, toothed grooves are added along the bottom plate of the inlet channel to resist the sliding force formed by water pressure. The whole structure is safe and reliable, the materials are conventionally available, and the construction is convenient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the inlet and outlet structure on a soft substrate according to the present invention.

[0015] Figure 2 yes Figure 1 A schematic diagram of the cross-section along the A-A direction;

[0016] Figure 3 yes Figure 1 Schematic diagram of the cross section in the B-B direction;

[0017] Figure 4 yes Figure 1 Schematic diagram of the C-C direction section;

[0018] Figure 5 yes Figure 1 Schematic diagram of the cross section in the D-D direction;

[0019] Figure 6 yes Figure 1 Schematic diagram of the cross section in the E-E direction;

[0020] Figure 7 yes Figure 1Schematic diagram of the cross section in the F-F direction;

[0021] Figure 8 yes Figure 1 Schematic diagram of the cross section in the G-G direction;

[0022] Figure 9 yes Figure 2 A magnified view of a portion at point H;

[0023] Figure 10 yes Figure 2 A magnified view of part J.

[0024] The markings in the attached diagram are as follows: 100-Inlet channel section; 200-Inlet section; 1-Inlet channel bottom slab; 2-Groove; 3-Subbase concrete; 4-Top support beam; 5-Support and anti-vortex beam; 6-Top anti-vortex beam; 7-Structural joint; 8-Surface waterstop; 9-PVC waterstop; 11-Trash rack; 12-Anchor bolt; 13-Gravel layer; 14-Geotextile; 15-Removable steel mesh formwork; 16-Geomembrane; 17-Inlet top slab; 18-Breast wall; 19-Inlet side wall; 20-Backfill soil; 21-Inlet bottom slab; 22-Inlet side wall; 23-Diversion pier; 24-Transition section; 25-Removable steel formwork; 26-Water diversion tunnel; 27-Wing wall; 28-Wing plate. Detailed Implementation

[0025] This utility model relates to an inlet / outlet structure on a soft substrate, such as... Figure 1 — Figure 10 As shown, the system includes an inlet channel section 100 and an inlet section 200. The inlet channel section 100 consists of a sloping inlet channel bottom plate 1 and an inlet side wall 19 forming the main inlet channel. Inlet side walls 19 are provided on the left and right sides of the inlet channel bottom plate 1. A top support beam 4, a support and anti-vortex beam 5, and a top anti-vortex beam 6 are provided on the top of the inlet side wall 19. Wing walls 27 and wing plates 28 are provided on the outer wall of the inlet side wall 19. An inlet section 200 is provided at the rear of the inlet channel section 100. The inlet section 200 consists of an inlet bottom plate 21 and an inlet side wall 22. Inlet side walls 22 are provided on both sides of the inlet bottom plate 21. A breast wall 18 is provided between the left and right inlet side walls 22. An inlet top plate 17 is provided below the breast wall 18.

[0026] Furthermore, a transition section 24 is provided at the rear of the inlet section 200, a non-removable template 25 is provided inside the transition section 24, and a water diversion tunnel 26 is provided at the rear of the transition section 24.

[0027] Furthermore, a trash rack 11 is provided between the imported base plate 21 and the breast wall 18.

[0028] Furthermore, the water inlet channel section 100 is provided with a structural joint 7 along the longitudinal direction, the surface of the structural joint 7 is covered with a surface water-stop 8, and a PVC water-stop strip 9 is provided inside the structural joint 7.

[0029] Furthermore, a crushed stone layer 13 is provided on the outside of the structural joint 7, and a non-removable steel mesh template 15 is provided on the outside of the crushed stone layer 13. The non-removable steel mesh template 15 is wrapped with geotextile 14.

[0030] Furthermore, the bottom of the water inlet channel bottom plate 1 is provided with toothed grooves 2.

[0031] Furthermore, a layer of concrete 3 is provided at the bottom of the water inlet channel bottom plate 1.

[0032] Furthermore, a geomembrane 16 is provided around the water inlet section 100 and the inlet section 200, and the geomembrane 16 is fixed to the water inlet section 100 and the inlet section 200 by anchor bolts 12.

[0033] Furthermore, a guide pier 23 is provided in the middle of the inlet section 200.

[0034] This utility model discloses an inlet and outlet structure on a soft foundation, mainly divided into an inlet channel section 100 and an inlet section 200. The elevation of the bottom plate 1 of the inlet channel section 100 decreases with a slope towards the inlet section 200. The height of the inlet sidewall 19 gradually increases while maintaining a constant top elevation. A top support beam 4 is installed at the top of the inlet sidewall 19, which bears both compressive and tensile forces. A longitudinal support and anti-vortex beam 5 and a transverse top anti-vortex beam 6 are installed at the top of the inlet sidewall 19 near the inlet section 200 to ensure smooth water flow and prevent air intake problems. During construction, after compacting the soft foundation at the bottom, a layer of foundation concrete 3 is poured. A crushed stone layer 13 is then laid at the bottom of the structural joint 7 upstream of the inlet section 200. The crushed stone layer 13 is secured to the outside with a formwork that can be removed, and then wrapped with geotextile 14. Next, the inlet bottom slab 21, inlet sidewall 22, inlet top slab 17, and guide pier 23 of the inlet section 200 are poured simultaneously within the foundation pit. Before pouring the concrete, the PVC waterstop 9 in the structural joint 7 needs to be installed in advance. Simultaneously, the pouring of the transition section 24 should be considered and should be carried out after the formwork 25 is installed. Next, the inlet channel section 100 is poured. The bottom plate 1, toothed groove 2, and inlet side wall 19 of the inlet channel section 100 are poured. Before pouring, the outer wing wall 27 and wing plate 28 must be poured at the same time. Then, the top support beam 4, support and anti-vortex beam 5, and top anti-vortex beam 6 are poured. After the concrete strength reaches the requirements, the backfill soil 20 on the outside of the side wall is constructed. Then, the trash rack 11 is installed. Finally, the surface water stop 8 is applied to the outer surface of the structural joint 7, and the inlet channel section 100 and the inlet section 200 are covered with geomembrane 16. The geomembrane 16 is fixed with anchor bolts 12 to form a complete seepage prevention system structure. This design proposes an inlet / outlet structure on a soft foundation. The top support beam 4 serves as a crucial load-bearing structure between the left and right inlet sidewalls 19. Under normal operating conditions, it is subjected to tension, while under maintenance conditions, it is subjected to compression. To address the buoyancy issue under extremely unfavorable conditions, outwardly extending wing walls 27 and wing plates 28 are installed on the inlet sidewalls 19 to utilize the weight of the soil on them to balance the buoyancy force of the external water (during maintenance). Additionally, toothed grooves 2 are added along the bottom plate 1 of the inlet channel to resist the sliding force formed by water pressure. The overall design is safe and reliable, the materials are readily available, and the construction is convenient.

Claims

1. An inlet / outlet structure on a soft foundation, characterized in that: The system includes an inlet channel section (100) and an inlet section (200). The inlet channel section (100) consists of a sloping inlet channel bottom plate (1) and an inlet side wall (19) forming the main inlet channel. The inlet channel bottom plate (1) is provided with inlet side walls (19) on the left and right sides. A top support beam (4), a support and anti-vortex beam (5), and a top anti-vortex beam (6) are provided on the top of the inlet side wall (19). A wing wall (27) and a wing plate (28) are provided on the outer wall of the inlet side wall (19). An inlet section (200) is provided at the rear of the inlet channel section (100). The inlet section (200) consists of an inlet bottom plate (21) and an inlet side wall (22). An inlet side wall (22) is provided on both sides of the inlet bottom plate (21). A breast wall (18) is provided between the left and right inlet side walls (22). An inlet top plate (17) is provided under the breast wall (18).

2. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: A transition section (24) is provided at the rear of the inlet section (200), a non-removable template (25) is provided inside the transition section (24), and a water diversion tunnel (26) is provided at the rear of the transition section (24).

3. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: A trash rack (11) is installed between the imported bottom plate (21) and the breast wall (18).

4. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: The water inlet channel section (100) is provided with a structural joint (7) along the longitudinal direction. The surface of the structural joint (7) is covered with a surface water stop (8), and a PVC water stop strip (9) is provided inside the structural joint (7).

5. The inlet / outlet structure on a soft substrate as described in claim 4, characterized in that: A crushed stone layer (13) is provided on the outside of the structural joint (7), and a non-removable steel mesh template (15) is provided on the outside of the crushed stone layer (13), and the non-removable steel mesh template (15) is wrapped with geotextile (14).

6. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: The bottom of the inlet channel bottom plate (1) is provided with toothed grooves (2).

7. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: A layer of concrete (3) is provided at the bottom of the water inlet channel bottom plate (1).

8. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: A geomembrane (16) is provided around the water intake section (100) and the inlet section (200), and the geomembrane (16) is fixed to the water intake section (100) and the inlet section (200) by anchor bolts (12).

9. The inlet / outlet structure on a soft substrate as described in claim 1, characterized in that: A guide pier (23) is set in the middle of the inlet section (200).

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