Water-collecting pool foundation pit supporting device

Abstract

The utility model discloses a water collecting pool foundation pit supporting device, including annular inner steel sheet pile (1) and outer steel sheet pile (2), inner steel sheet pile (1) and outer steel sheet pile (2) are inlayed and set up to inside and outside, and the interval is left between inner steel sheet pile (1) and outer steel sheet pile (2), and the inner wall of outer steel sheet pile (2) is connected with annular first encloses the purlin (3), and the middle part of first encloses the purlin (3) is connected with first support beam (4), and the inner wall of inner steel sheet pile (1) is connected with annular second encloses the purlin (5), and the middle part of second encloses the purlin (5) is connected with second support beam (6), and the inside of inner steel sheet pile (1) forms first foundation pit (7) for pouring water collecting pool. The utility model discloses the utility model can support the water collecting pool construction area to improve the pouring stability of water collecting pool.

Description

Technical Field

[0001] This utility model relates to an auxiliary processing device for a water collection tank, and in particular to a support device for a water collection tank foundation pit. Background Technology

[0002] Pumped storage power stations typically require a sump to connect to a nearby river for their water supply system. The sump's design is similar to that shown in patent 201420456391.3, employing a reinforced concrete structure to create an underground sump. A water intake pipe connects the sump to a nearby river, utilizing the water level difference to draw water from the river into the sump. Currently, the method for constructing the sump involves excavating a pit near the river, pouring the concrete sump within the pit, and then backfilling the surrounding trenches. However, due to the complex geological conditions in the sump's location, it is highly susceptible to displacement, severe tilting, or piping during pouring, posing significant safety risks and greatly complicating construction. Currently, a mature excavation and support construction method suitable for the sump's construction environment has not yet been developed. Utility Model Content

[0003] The purpose of this invention is to provide a support device for the foundation pit of a water collection tank. It can support the construction area of ​​the water collection tank, thereby improving the stability of the water collection tank during pouring.

[0004] The technical solution of this utility model: a support device for a water collection tank foundation pit, comprising an annular inner steel sheet pile and an outer steel sheet pile, the inner steel sheet pile and the outer steel sheet pile being nested inside and outside, with a gap between the inner steel sheet pile and the outer steel sheet pile, the inner wall of the outer steel sheet pile being connected to an annular first waler, the middle of the first waler being connected to a first support beam, the inner wall of the inner steel sheet pile being connected to an annular second waler, the middle of the second waler being connected to a second support beam, and the inner side of the inner steel sheet pile forming a first foundation pit for pouring the water collection tank.

[0005] In the aforementioned water collection pool foundation pit support device, the top surface height of the outer steel sheet pile is higher than the top surface height of the inner steel sheet pile, and a second foundation pit is formed on the inner side of the outer steel sheet pile. The second foundation pit and the first foundation pit are distributed vertically and are interconnected.

[0006] In the aforementioned water collection tank foundation pit support device, the inner wall of the outer steel sheet pile is connected to several first support members, and the first waler is fixed on the first support members; the inner wall of the inner steel sheet pile is connected to several second support members, and the second waler is fixed on the second support members.

[0007] In the aforementioned water collection pool foundation pit support device, there are multiple second walers, which are distributed vertically at intervals along the height direction of the inner steel sheet piles, and multiple second support members are connected to the bottom of each second waler.

[0008] In the aforementioned water collection pool foundation pit support device, a first foundation soil layer is formed on the outer side of the outer steel sheet pile, and a second foundation soil layer is formed between the outer steel sheet pile and the inner steel sheet pile.

[0009] In the aforementioned water collection pool foundation pit support device, the inner steel sheet piles and the outer steel sheet piles are connected to each other via a force-transmitting steel frame plate located at the top of the second foundation soil layer.

[0010] In the aforementioned water collection pool foundation pit support device, both the inner and outer steel sheet piles are composed of several U-shaped steel sheet piles, and the outer and inner steel sheet piles are rectangular rings.

[0011] In the aforementioned support device for the water collection tank foundation pit, both the first waler and the second waler are made of steel sections spliced ​​together, and reinforcing ribs are connected at the corners of the first waler and the second waler.

[0012] Compared with the prior art, this utility model has the following characteristics: (1) By limiting the structure of the inner steel sheet pile and the outer steel sheet pile, the present invention can intercept the land outside the first foundation pit and the second foundation pit after the two are built, thereby effectively avoiding the problem of displacement, serious tilting or piping of the land around the water collection pool caused by the impact depression of the river channel, and ensuring the pouring stability of the water collection pool in the first foundation pit. (2) By coordinating the structures of the first waler and the second waler, the inner sheet pile and the outer sheet pile can be limited, thereby ensuring the positioning effect and enclosure quality of the two; on this basis, by coordinating the first support beam and the second support beam, the first waler and the second waler can be reinforced, thereby ensuring the installation stability of the two after the inner foundation soil is excavated, as well as the structural stability of this utility model during the water collection pool pouring process; (3) Through the structural cooperation of the first support member and the second support member, the first support beam and the second support beam can be supported after the first foundation pit and the second foundation pit are opened, thereby ensuring the structural stability and reinforcement effect of the first support beam and the second support beam; by strengthening the corner reinforcement, the first waler and the second waler can be reinforced together to prevent the first waler and the second waler from shifting or deforming under force. Therefore, this utility model can provide support for the construction area of ​​the water collection tank, thereby improving the casting stability of the water collection tank. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 A magnified view from direction A; Figure 3 yes Figure 1 Top view; Figure 4This is a schematic diagram of the structure of the present invention after the water collection tank has been cast and molded; Figure 5 This is a structural diagram of the water collection tank after the support structure has been removed; Figure 6 This is a schematic diagram showing the connection between the second support beam and the reinforcement of the water collection tank.

[0014] The markings in the attached diagram are as follows: 1-Inner sheet pile, 2-Outer sheet pile, 3-First waler, 4-First support beam, 5-Second waler, 6-Second support beam, 7-First foundation pit, 8-Second foundation pit, 9-First support member, 10-Second support member, 11-First foundation soil layer, 12-Second foundation soil layer, 13-Force transmission steel frame plate, 14-Reinforcing corner reinforcement. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0016] Example. A support device for the foundation pit of a water collection tank, configured as follows: Figure 1 As shown, the structure includes an inner sheet pile 1 and an outer sheet pile 2 arranged in a nested configuration, with a gap between them. The inner wall of the outer sheet pile 2 is connected to an annular first waler 3, and the middle of the first waler 3 is connected to a first support beam 4. The inner wall of the inner sheet pile 1 is connected to an annular second waler 5, and the middle of the second waler 5 is connected to a second support beam 6. The inner side of the inner sheet pile 1 forms a first foundation pit 7 for pouring a water collection pool.

[0017] The first waler 3 and the second waler 5 are both formed by splicing 400*400 H-shaped steel from top to bottom, and the first support beam 4 and the second support beam 6 are both formed by splicing 400*400 H-shaped steel from left to right.

[0018] The top surface height of the outer sheet pile 2 is higher than that of the inner sheet pile 1. A second foundation pit 8 is formed on the inner side of the outer sheet pile 2. The second foundation pit 8 and the first foundation pit 7 are distributed vertically and are interconnected.

[0019] The inner wall of the outer sheet pile 2 is connected to several first support members 9, and the first waler 3 is fixed on the first support members 9; the inner wall of the inner sheet pile 1 is connected to several second support members 10, and the second waler 5 is fixed on the second support members 10.

[0020] The number of second walers 5 is multiple and they are distributed vertically at intervals along the height direction of the inner sheet pile 1. The interval between adjacent second walers 5 is 0.5m. Multiple second support members 10 are connected to the bottom of each second waler 5.

[0021] The bottom ends of the first support beam 4 and the second support beam 6 are welded to the first waler 3 and the second waler 5 on both sides by 2cm thick 20cm*20cm equilateral triangular steel plates, thereby using the steel plates to support the first support beam 4 and the second support beam 6.

[0022] The first support member 9 and the second support member 10 are both 28# channel steel with a length of 0.5m, and the interval between adjacent first support members 9 and adjacent second support members 10 is 2m.

[0023] A first foundation soil layer 11 is formed on the outer side of the outer sheet pile 2, and a second foundation soil layer 12 is formed between the outer sheet pile 2 and the inner sheet pile 1.

[0024] The inner sheet pile 1 and the outer sheet pile 2 are connected to each other by a force transmission steel frame plate 13 located at the top of the second foundation soil layer 12. The force transmission steel frame plate 13 is a 15cm thick concrete layer formed by casting.

[0025] The inner sheet pile 1 and the outer sheet pile 2 are both formed by several U-shaped sheet piles. The inner sheet pile 1 and the outer sheet pile 2 are both rectangular rings. During processing, a tracked excavator uses a 45kW vibratory hammer to strike the U-shaped sheet piles, causing them to sink into the soil to form the inner sheet pile 1 and the outer sheet pile 2.

[0026] After each U-shaped sheet pile is driven into place, its top is welded and fixed to the adjacent U-shaped sheet pile to prevent it from sinking due to the driving of subsequent U-shaped sheet piles. Before the subsequent U-shaped sheet piles are extracted, the welded parts are cut by the operators to ensure the normal extraction of each U-shaped sheet pile.

[0027] The first waler 3 and the second waler 5 are both made of steel sections. The corners of the first waler 3 and the corners of the second waler 5 are connected with reinforcing ribs 14, which are made of 2cm thick 20cm*20cm equilateral triangular steel plates.

[0028] Using the ground level as the reference plane, the top height of the outer sheet pile 2 is +0.5m, the bottom height of the first support beam 4 is -0.5m, the bottom height of the second foundation pit 8 is -2m, the top height of the inner sheet pile 1 is -1.5m, the bottom height of the uppermost second support beam 6 is -3m, and the bottom height of the first foundation pit 7 is -8.35m. A 1.5m thick layer of concrete is poured into the first foundation pit 7 as a bottom seal, and the surface of the bottom seal serves as the pouring bottom surface of the water collection pool.

[0029] The concrete bottom is designed with a stepped groove to avoid the second support member 10 during pouring, thereby facilitating the subsequent cutting and removal of the second support member 10 by the workers.

[0030] In this embodiment, during construction, a guide beam is first installed on the ground inside the outer sheet pile 2. Then, the guide beam is used as a guide to sequentially drive each U-shaped sheet pile of the outer sheet pile 2 into the foundation soil. The guide beam is welded from channel steel, and a guide groove is formed in the middle of the guide beam for the outer sheet pile 2 to pass through. This guide groove limits the movement of the outer sheet pile 2 during driving, preventing the U-shaped sheet piles from shifting. The guide beam is removed after the outer sheet pile 2 is formed.

[0031] After the outer sheet piles 2 are formed, the workers excavate the foundation soil inside the outer sheet piles 2 to form a second foundation pit 8. Then, the inner sheet piles 1 are driven in the same manner. After the inner sheet piles 1 are driven, the first waler 3 is welded to the outer sheet piles 2 through the first support member 9, thus using the first waler 3 to support the outer sheet piles 2 instead of the foundation soil. At the same time, the first support beam 4 is welded to the inside of the first waler 3, thereby using the first support beam 4 to reinforce the first waler 3 and prevent deformation under stress. After the first waler 3 is fixed, the workers add steel pads to the gaps between the outer sheet piles 2 and the first waler 3, thus connecting the first waler 3 and each U-shaped sheet pile to form a whole.

[0032] After the first waler 3 was constructed, the workers excavated the first foundation pit 7 using the core-excavation method. When the first foundation pit 7 was excavated to a height lower than the bottom surface of the uppermost second waler 5, the workers immediately hoisted the second waler 5 into the first foundation pit 7 and welded it, so that the second waler 5, the second support beam 6, and the reinforcing ribs 14 were welded together on the inner side of the inner steel sheet piles 1. When the first foundation pit 7 was excavated to a height 0.5m lower than the bottom surface of the upper second waler 5, the workers immediately hoisted another second waler 5 into the first foundation pit 7 and welded it, so that the second walers 5 were arranged at intervals on the inner wall of the inner steel sheet piles 1. During the later dismantling of the first waler 3 and the second waler 5, the workers cut off the welded parts between the walers and the steel sheet piles, thereby achieving the separate removal of the first waler 3 and the second waler 5.

[0033] After the excavation of the first foundation pit 7 is completed, the workers will pour concrete to seal the bottom of the first foundation pit 7, and pour a 15cm thick force transmission steel frame plate 13 in the gap between the inner steel sheet pile 1 and the outer steel sheet pile 2. In this way, the force transmission steel frame plate will connect the inner steel sheet pile 1 and the outer steel sheet pile 2 to each other, thereby improving the force transmission stability of the two. On the other hand, it will also standardize the construction site, and the force transmission steel frame plate 13 can be used as a construction platform for operation when the subsequent water collection pool is built.

[0034] After the concrete base is formed, the workers use the concrete base as a base to pour the water collection tank. They then use the support device of this embodiment to fix the foundation soil around the water collection tank, preventing it from shifting or tilting due to external influences during pouring. During the pouring process, because the second support beam 6 completely penetrates the water collection tank horizontally, if the reinforcing steel inside the tank is intercepted by the second support beam 6 during construction, it will... Figure 6 As shown, the middle of the reinforcing bar N1 is cut off and welded to the upper and lower sides of the second support beam 6 respectively. Then, a main reinforcing bar N2 is added inside the concrete sidewall on one side of the second support beam 6. The reinforcing bar N1 at the top of the second support beam 6 is then welded to the main reinforcing bar N2 through the tie bar N3, thereby ensuring the structural strength of the water collection tank. At the same time, a water-stop steel plate is welded around the inner wall of the second support beam 6 to seal the second support beam 6 and prevent water in the water collection tank from overflowing from the installation gaps of the second support beam 6.

[0035] After the construction of the water collection tank was completed, the workers backfilled the gap between the water collection tank and the inner sheet piles 1 with crushed stone soil up to the support position of each second waler 5 to reduce the support pressure on the inner sheet piles 1 and the second waler 5. Then, the first waler 3 and the first support beam 4 were removed and hoisted out, and then the second waler 5 and the second support beam 6 were removed layer by layer until the first foundation pit 7 outside the water collection tank was completely backfilled. When removing the second support beam 6, the workers cut off and moved the second support beam 6 that extended to the outside of the water collection tank, while the second support beam 6 inside the water collection tank was retained as a reinforcing bar for the water collection tank.

[0036] After the first foundation pit 7 was backfilled, workers used an excavator with a vibratory hammer to vibrate and extract the inner sheet piles 1. Specifically, the vibratory hammer applied vibration force to the U-shaped sheet piles, disturbing the soil and breaking the frictional resistance and adhesion between the piles and the soil. Simultaneously, a crane applied lifting force to extract the piles. The resulting pile holes were then filled with medium-coarse sand and compacted. After the inner sheet piles 1 were removed, the second foundation pit 8 was backfilled and the outer sheet piles 2 were removed in sequence, following the same steps, thus completing the removal of the support structure.

Claims

1. A support device for a water collection tank foundation pit, characterized in that: It includes an inner steel sheet pile (1) and an outer steel sheet pile (2) in a ring. The inner steel sheet pile (1) and the outer steel sheet pile (2) are nested inside and outside. There is a gap between the inner steel sheet pile (1) and the outer steel sheet pile (2). The inner wall of the outer steel sheet pile (2) is connected to a first ring waler (3). The middle part of the first waler (3) is connected to a first support beam (4). The inner wall of the inner steel sheet pile (1) is connected to a second ring waler (5). The middle part of the second waler (5) is connected to a second support beam (6). The inner side of the inner steel sheet pile (1) forms a first foundation pit (7) for pouring the water collection pool.

2. The water collection tank foundation pit support device according to claim 1, characterized in that: The top surface height of the outer sheet pile (2) is higher than that of the inner sheet pile (1). A second foundation pit (8) is formed on the inner side of the outer sheet pile (2). The second foundation pit (8) and the first foundation pit (7) are distributed vertically and connected to each other.

3. The water collection tank foundation pit support device according to claim 1, characterized in that: The inner wall of the outer sheet pile (2) is connected to several first support members (9), and the first waler (3) is fixed on the first support member (9); the inner wall of the inner sheet pile (1) is connected to several second support members (10), and the second waler (5) is fixed on the second support member (10).

4. The water collection tank foundation pit support device according to claim 3, characterized in that: The number of the second walers (5) is multiple and they are distributed vertically at intervals along the height direction of the inner sheet pile (1). Each second waler (5) is connected to multiple second support members (10) around its bottom.

5. The water collection tank foundation pit support device according to claim 1, characterized in that: A first subgrade layer (11) is formed on the outside of the outer sheet pile (2), and a second subgrade layer (12) is formed between the outer sheet pile (2) and the inner sheet pile (1).

6. The water collection tank foundation pit support device according to claim 5, characterized in that: The inner sheet pile (1) and the outer sheet pile (2) are connected to each other by a force-transmitting steel frame plate (13) located at the top of the second foundation soil layer (12).

7. The water collection tank foundation pit support device according to claim 1, characterized in that: The inner sheet pile (1) and the outer sheet pile (2) are both formed by several U-shaped sheet piles, and the outer sheet pile (1) and the outer sheet pile (2) are both rectangular rings.

8. The water collection tank foundation pit support device according to claim 7, characterized in that: The first waler (3) and the second waler (5) are both made of steel sections spliced ​​together, and the corners of the first waler (3) and the second waler (5) are connected with reinforcing ribs (14).

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