Primary support structure of water collecting well in tunnel

Abstract

The utility model relates to a preliminary bracing structure of a water-collecting well in a tunnel, a plurality of grids are fixedly arranged in the tunnel at intervals, the preliminary bracing structure comprises an open caisson, an open caisson, an open caisson, an open caisson, an open caisson support and a water-collecting well, the reinforcing assemblies are fixedly installed at the bottom ends of the two sides of the grating and suitable for reinforcing the structure of the grating and the soil body below the grating. The dewatering unit is fixedly mounted on the grating, the bottom end of the dewatering unit is located in the soil body on the outer side of the open caisson, and the dewatering unit is suitable for pumping out underground water in the soil body on the peripheral side of the open caisson; the connecting unit is fixedly mounted at the joint of the grating and the open caisson and is suitable for positioning and fixing the open caisson; and the grouting unit is located in the side wall of the open caisson and suitable for conducting grouting or lubricating on the inner side and the outer side of the open caisson. According to the primary supporting structure, the open caisson is arranged on the outer side of the preset position of the water-collecting well, then the water-collecting well is constructed, and water stopping and reinforcing can be conducted on the water-collecting well; the grating is installed in the tunnel to serve as a primary support, and the submerged well and the grating are fixedly installed together to form a whole.

Description

Technical Field

[0001] The utility model belongs to the technical field of water collection wells, relates to the initial support of water collection wells, and in particular to an initial support structure of a water collection well in a tunnel. Background Art

[0002] In underground engineering, the shallow buried tunneling method has become one of the important methods for urban underground engineering construction because it can adapt to different geological conditions and engineering needs, its structural form is flexible and has little impact on ground buildings, roads and underground pipelines. In tunneling construction, the groundwater level has a great impact on the construction, especially when the excavation section is below the groundwater level and located in sandy strata, which will cause great risks and difficulties to the tunnel excavation construction. The traditional tunneling water collection well is constructed simultaneously with the primary support structure of the tunnel. However, during the construction process, due to the high groundwater level and loose soil, quicksand, landslides and other problems are prone to occur during the excavation of the water collection well, which not only seriously affects the on-site construction progress and generates redundant engineering volume, but also threatens the safety of the water collection well operators.

[0003] To this end, we propose an initial support structure for the water collection well in the tunnel to solve the above problems. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide an initial support structure for a water collection well in a tunnel which has a simple structure and is stable and firm.

[0005] To solve the above problems, the technical solution of the utility model is:

[0006] An initial support structure for a water collection well in a tunnel, wherein a plurality of grids are fixedly installed at intervals in the tunnel, comprising:

[0007] A caisson is located below the grille, and the top end is connected to the bottom end of the grille;

[0008] The reinforcement components are fixedly installed at the bottom ends of both sides of the grille and are suitable for reinforcing the structure of the grille and the soil under the grille;

[0009] The dewatering unit is fixedly mounted on the grid, and the bottom end is located in the soil outside the caisson, suitable for pumping out groundwater in the soil around the caisson;

[0010] The connection unit is fixedly installed at the connection between the grid and the caisson, and is suitable for positioning and fixing the caisson;

[0011] The grouting unit is located inside the side wall of the caisson and is suitable for grouting or lubricating the inside and outside of the caisson.

[0012] In a further embodiment, the reinforcement assembly comprises:

[0013] The reinforcement support is tilted and fixedly installed at the bottom ends of both sides of the grille, suitable for strengthening the structure of the grille;

[0014] The locking foot anchor rods are fixedly installed at the bottom ends on both sides of the grille. The bottom ends of the locking foot anchor rods are located in the soil outside the caisson, which is suitable for grouting reinforcement of the soil.

[0015] In a further embodiment, the downwater unit includes a downwater pipe, a top end of the downwater pipe is fixedly mounted on a bottom end of the grille, and a bottom end of the downwater pipe is located at a peripheral side of the caisson and is lower than a bottom end of the caisson.

[0016] In a further embodiment, the connecting unit comprises:

[0017] A pair of grille connecting plates are fixedly mounted on the bottom end of the grille and located on both sides of the top end of the caisson;

[0018] A plurality of caisson connecting parts are fixed at intervals on the outer side wall of the caisson and correspond to the positions of the grid connecting plates.

[0019] In a further embodiment, a pair of grille connecting plates are fixedly mounted on the front and rear sides of the grille, and the grille connecting plates are angle steels and are provided with a plurality of bolt holes at intervals.

[0020] In a further embodiment, the caisson connection comprises:

[0021] A pair of vertically arranged sliding bars are fixedly installed at intervals on the outer wall of the caisson, and a sliding groove is formed between the pair of sliding bars, which is suitable for installing and positioning the caisson;

[0022] The caisson connecting plate is fixedly installed on the top end of the slideway, and a plurality of bolt holes are arranged at intervals on the caisson connecting plate, and the bolt holes of the caisson connecting plate correspond to the bolt holes of the grille connecting plate.

[0023] In a further embodiment, a pair of grid connection plates and the caisson connection plate are fixed together by bolts.

[0024] In a further embodiment, the grouting unit comprises a grouting pipe, which is fixedly installed in the side wall of the caisson;

[0025] The grouting pipe comprises a vertically arranged main pipe and a plurality of horizontally arranged branch pipes. A plurality of branch pipes are fixedly installed on the main pipe at vertical intervals, and the branch pipes horizontally penetrate the side wall of the caisson.

[0026] In a further embodiment, a valve is fixedly installed on one end of the branch pipe close to the inner side of the caisson.

[0027] In a further embodiment, the steel bars of the caisson are fixedly mounted together with the steel bars of the grille.

[0028] Compared with the prior art, the beneficial effects of the utility model are:

[0029] 1. This initial support structure first sets up a caisson outside the predetermined position of the water collection well, and then constructs the water collection well. The caisson serves as the initial support of the water collection well, which can stop and reinforce the water collection well to avoid problems such as quicksand and landslides during the construction of the water collection well. The grille is fixedly installed in the tunnel as the initial support, and the caisson and the grille are fixed together to form a whole, thereby improving the structural stability and ensuring the construction quality of the initial support.

[0030] 2. This initial support structure has a pair of grille connecting plates fixedly installed at the bottom end of the grille, and a number of pairs of sliding bars are fixedly installed on the outer wall of the caisson at intervals, with a slide groove formed between the pair of sliding bars. When the caisson sinks, the grille is located in the slide groove, so that the caisson is accurately positioned and there is no deviation when sinking; a caisson connecting plate is fixedly installed at the top end of the slide groove, and when the caisson connecting plate is aligned with the grille connecting plate, the caisson is sunk into place, and the caisson connecting plate and the grille connecting plate are fixed together with bolts, and the steel bars on the top of the caisson are welded to the steel bars of the grille to form a whole, thereby improving the construction quality.

[0031] 3. This initial support structure has several grouting pipes fixedly installed in the side wall of the caisson. The grouting pipes include a vertically arranged main pipe and several horizontally arranged branch pipes. The branch pipes horizontally penetrate the side wall of the caisson, and a valve is fixedly installed at one end of the branch pipe close to the inner side of the caisson. When the caisson has difficulty sinking due to excessive friction, the valve is closed, and lubricating mud is input into the grouting pipe to lubricate the outer side of the caisson to ensure smooth sinking of the caisson. After the construction of the caisson concrete is completed, grouting reinforcement can be carried out inside and outside the caisson through the grouting pipe. It integrates multiple functions in one, has a simple structure, and is easy and quick to use.

[0032] 4. This initial support structure has reinforcement components fixedly installed at the bottom ends on both sides of the grille. The reinforcement components include reinforcement supports and locking anchor rods. The reinforcement supports are inclined and fixedly installed at the bottom ends on both sides of the grille, so that the bottom ends on both sides of the grille form a triangular structure to enhance the structural strength of the grille; locking anchor rods are fixedly installed at the bottom ends on both sides of the grille, and the bottom ends of the locking anchor rods are located in the soil on both sides of the immersed tube, which is suitable for grouting reinforcement of the soil to avoid settlement of the immersed tube and the grille and ensure the installation quality of the immersed tube and the grille.

[0033] 5. This initial support structure has downcomers installed at fixed intervals at the bottom end of the grille. The bottom end of the downcomer is located outside the caisson, and the top end of the downcomer is connected to a vacuum pump to facilitate the extraction of groundwater in the soil outside the caisson before construction, thereby ensuring the construction safety of the caisson and water collection well. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of an initial support structure of a water collection well in a tunnel;

[0035] Figure 2 A schematic diagram of a reinforced support structure of an initial support structure of a water collection well in a tunnel;

[0036] Figure 3 A side cross-sectional view of a grille of an initial support structure for a water collection well in a tunnel;

[0037] Figure 4 It is a top view of a caisson of the initial support structure of a water collection well in a tunnel;

[0038] Figure 5 A side view of a caisson which is an initial support structure for a water collection well in a tunnel.

[0039] In the figure: 1. grille; 11. reinforcement assembly; 111. reinforced support; 112. locking anchor rod; 12. grille connecting plate; 13. downcomer; 2. caisson; 21. grouting pipe; 22. sliding rod; 23. caisson connecting plate. DETAILED DESCRIPTION

[0040] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0041] Embodiment 1:

[0042] An initial support structure for a water collection well in a tunnel, such as Figures 1 to 5 As shown, it includes a grille 1 and a caisson 2. The grille 1 is fixedly installed at the top end of the caisson 2. The caisson 2 is located outside the predetermined position of the water collection well. The grille 1 serves as the initial support of the water collection well to stop and reinforce the water collection well. The grille 1 serves as the initial support of the tunnel to support the tunnel. The grille 1 and the caisson 2 are connected into an integral structure, and the initial support of the water collection well is fixedly connected with the initial support of the tunnel to improve the structural stability.

[0043] like Figures 1 to 3As shown, reinforcement components 11 are fixedly installed at the "L"-shaped structures on both sides of the grille 1, and the reinforcement components 11 include reinforcement supports 111 and locking anchor rods 112. The two reinforcement supports 111 are both inclined rod structures, forming a triangular structure with the bottom ends on both sides of the grille 1 to strengthen the structure of the grille 1. The two ends of the reinforcement supports 111 are fixedly installed with steel plates and are equipped with bolts for fixed installation on the inner sides of the two ends of the grille 1; two inclined locking anchor rods 112 are fixedly installed at the bottom ends on both sides of the grille 1, and the bottom ends of the locking anchor rods 112 are inserted into the soil below the grille 1, which is suitable for grouting reinforcement of the soil below the grille 1 to avoid settlement of the grille 1 and the caisson 2 and improve the installation quality.

[0044] A pair of downpipes 13 are inserted into the bottom end of the grille 1. The bottom ends of the pair of downpipes 13 are both located in the soil outside the caisson 2. The top end of the downpipe 13 is connected to a vacuum pump, which is used to extract groundwater in the soil around the caisson 2 for precipitation, thereby ensuring the safety of the caisson 2 construction. The downpipe 13 is a hollow structure and has a number of small holes arranged in a plum blossom shape on the side wall, which is suitable for pumping water. The tail end of the downpipe 13 is provided with a thread, which is suitable for connecting other downpipes 13 for extension or connecting a vacuum pump. The bottom end of the downpipe 13 is a conical structure, which is convenient for insertion into the soil. A gauze is wrapped around the outside of the downpipe 13 to filter the fine sand in the surrounding soil, avoid clogging of the downpipe 13, and ensure the normal operation of the downpipe 13. Preferably, the downpipe 13 is a steel pipe; and the reinforcing support 111 is made of channel steel. The laying depth and spacing of the downpipe 13 are shown in Table 1:

[0045] Table 1

[0046] Water collection well size Minimum depth of downpipe installation / m Maximum spacing of downpipes / mm 1m×1m×1m 3m 1200 1m×1m×1.5m 3.5m 1000 1.5m×1.5m×1m 3.1m 850 2m×2m×1.5m 3.7m 700 2m×3m×1.5m 3.8m 600

[0047] A pair of grille connecting plates 12 are fixedly installed at the bottom end of the grille 1, and the pair of grille connecting plates 12 are located on both sides of the caisson 2, suitable for fixing the grille 1 and the caisson 2 together; the grille connecting plates 12 are a pair of angle steels, and a pair of angle steels are symmetrically fixedly installed on both sides of the grille 1, and a pair of angle steels are provided with a plurality of bolt holes at intervals for connecting the caisson 2.

[0048] like Figure 1 , Figure 4 and Figure 5As shown, the steel bars of the caisson 2 are fixedly connected with the steel bars of the grille 1, and a plurality of pairs of sliding bars 22 are fixedly installed on the outer wall of the caisson 2 at intervals. The sliding bars 22 are longer than the caisson 2, and each pair of sliding bars 22 is arranged at intervals, so that a slide groove is formed between the pair of sliding bars 22, and the grille connecting plate 12 is located in the slide groove, so that the caisson 2 is accurately positioned without deviation during the sinking installation process; a caisson connecting plate 23 is fixedly installed at the top of each slide groove, and a plurality of bolt holes are formed on the caisson connecting plate 23 at intervals and correspond to the bolt holes of the grille connecting plate 12, and the caisson connecting plate 23 and the grille connecting plate 12 are fixedly installed together by bolts. Preferably, the sliding bars 22 are steel bars; and the caisson connecting plate 23 is a steel plate.

[0049] A plurality of grouting pipes 21 are fixedly installed in the side walls on both sides of the caisson 2. The grouting pipes 21 include a vertically arranged main pipe and a plurality of horizontally arranged branch pipes. The main pipe is connected to the plurality of branch pipes. The top end of the main pipe is located above the caisson 2. The branch pipes penetrate the side walls of the caisson 2 transversely. Valves are fixedly installed on half of the branch pipes connected to the inner side of the caisson 2 to facilitate the injection of lubricating mud or reinforcing slurry into the surrounding side of the caisson 2. If the caisson 2 has difficulty in sinking due to excessive friction with the well wall, lubricating mud can be injected into the outer wall of the caisson 2 through the grouting pipes 21. The mass ratio of the mud is 35%-45% clay, 55%-65% water, and 0.4%-0.6% dispersant sodium silicate.

[0050] The working principle of the utility model is: when processing the grille 1, a pair of grille connecting plates 12 are fixedly installed at the bottom end of the grille 1, and an aeration block is fixedly installed at the grille 1 position between the pair of grille connecting plates 12. The thickness of the aeration block is half of the thickness of the bottom plate of the grille 1. Concrete is sprayed on the aeration block so that the bottom end of the grille 1 has a certain strength and is easy to break; after the grille 1 is installed to the predetermined position, the reinforcement components 11 are fixedly installed at the bottom ends on both sides of the grille 1, and the soil below the grille 1 is grouting reinforced by the locking foot anchor rods 112.

[0051] The downcomer 13 is fixedly installed on the grille 1 and the soil around the caisson 2 is dewatered, and then part of the grille 1 between a pair of grille connecting plates 12 on the grille 1 is broken, and each grille 1 is broken during the breaking to avoid safety problems caused by sudden pressure relief; the slide groove on the prepared caisson 2 is aligned with the grille connecting plate 12 and sunk to ensure that the caisson 2 is installed accurately. If the friction is too large during the sinking process, the valve of the grouting pipe 21 is closed, and lubricating mud is injected into the outside of the caisson 2 through the grouting pipe 21. The caisson 2 sinks into place when the grille connecting plate 12 is aligned with the caisson connecting plate 23. The grille connecting plate 12 and the caisson connecting plate 23 are fixedly installed together with bolts, and then the top end of the slide rod 22 of the caisson 2 is welded to the grille 1, the caisson 2 is poured with concrete and the bottom is sealed, and the valve of the grouting pipe 21 is opened, and grouting reinforcement is performed through the grouting pipe 21.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An initial support structure for a water collection well in a tunnel, wherein a plurality of grids (1) are fixedly installed at intervals in the tunnel, characterized in that: include: A caisson (2) is located below the grille (1), and the top end is connected to the bottom end of the grille (1); A reinforcement component (11) is fixedly mounted on the bottom ends of both sides of the grille (1), and is suitable for reinforcing the structure of the grille (1) and the soil below the grille (1); A dewatering unit, fixedly mounted on the grid (1), with a bottom end portion located in the soil outside the caisson (2), suitable for pumping out groundwater in the soil around the caisson (2); A connecting unit, fixedly installed at the connection between the grid (1) and the caisson (2), suitable for positioning and fixing the caisson (2); The grouting unit is located inside the side wall of the caisson (2) and is suitable for grouting or lubricating the inside and outside of the caisson (2).

2. The initial support structure of a water collection well in a tunnel according to claim 1, characterized in that: The reinforcement component (11) comprises: A reinforcing support (111) is arranged obliquely and fixedly mounted on the bottom ends of both sides of the grille (1), suitable for reinforcing the structure of the grille (1); The locking foot anchor rods (112) are fixedly mounted on the bottom ends of both sides of the grille (1); the bottom ends of the locking foot anchor rods (112) are located in the soil outside the caisson (2), and are suitable for grouting reinforcement of the soil.

3. The initial support structure of a water collection well in a tunnel according to claim 2, characterized in that: The precipitation unit comprises a precipitation pipe (13), the top end of the precipitation pipe (13) being fixedly mounted on the bottom end of the grille (1), and the bottom end of the precipitation pipe (13) being located on the peripheral side of the caisson (2) and lower than the bottom end of the caisson (2).

4. The initial support structure of a water collection well in a tunnel according to claim 3, characterized in that: The connecting unit comprises: A pair of grille connecting plates (12) fixedly mounted on the bottom end of the grille (1) and located on both sides of the top end of the caisson (2); A plurality of caisson connection parts are fixed at intervals on the outer side wall of the caisson (2) and correspond to the positions of the grid connection plates (12).

5. The initial support structure of a water collection well in a tunnel according to claim 4, characterized in that: A pair of grille connection plates (12) are fixedly mounted on the front and rear sides of the grille (1); the grille connection plates (12) are angle steels and are provided with a plurality of bolt holes at intervals.

6. The initial support structure of a water collection well in a tunnel according to claim 5, characterized in that: The caisson connection part comprises: A pair of vertically arranged sliding bars (22) are fixedly installed at intervals on the outer wall of the caisson (2), and a sliding groove is formed between the pair of sliding bars (22), which is suitable for installing and positioning the caisson (2); The caisson connecting plate (23) is fixedly mounted on the top end of the slideway, and a plurality of bolt holes are arranged at intervals on the caisson connecting plate (23), and the bolt holes of the caisson connecting plate (23) correspond to the bolt holes of the grille connecting plate (12).

7. The initial support structure of a water collection well in a tunnel according to claim 6, characterized in that: A pair of the grille connection plates (12) and the caisson connection plates (23) are fixed together by bolts.

8. The initial support structure of a water collection well in a tunnel according to claim 7, characterized in that: The grouting unit comprises a grouting pipe (21), and the grouting pipe (21) is fixedly installed in the side wall of the caisson (2); The grouting pipe (21) comprises a vertically arranged main pipe and a plurality of transversely arranged branch pipes, wherein a plurality of branch pipes are fixedly installed on the main pipe at vertical intervals, and the branch pipes transversely penetrate the side wall of the caisson (2).

9. The initial support structure of a water collection well in a tunnel according to claim 8, characterized in that: A valve is fixedly installed on one end of the branch pipe close to the inner side of the caisson (2).

10. The initial support structure of a water collection well in a tunnel according to claim 9, characterized in that: The steel bars of the caisson (2) and the steel bars of the grille (1) are fixedly installed together.

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