Box culvert repairing method and shallow layer closed drainage structure

Abstract

The invention discloses a box culvert repairing method which comprises the following steps: (1) shallow layer closed drainage: sinking steel sleeves on two sides of a box culvert by using a pressing sinking method; pumping water in the side steel sleeves for emptying, excavating shallow soil to the top of the box culvert, and determining the boundary position of the box culvert; a semicircular steel open caisson is downwards inserted into the inner side of the steel casing; mJS soil body reinforcement is conducted on the outer side and the bottom of the steel sleeve and the bottom of the box culvert; a gravel inverted filter layer is arranged in the steel sleeve barrel, a gravity flow pipeline is externally connected to a sewage discharge well, the top of the steel sleeve barrel is connected with an exhaust pipe after being sealed by a top cover, and a dry chemical filter material is arranged at an outlet of the exhaust pipe; (2) after an exhaust pipe, a top cover and a gravel inverted filter on the steel sleeve are removed, deep excavation and reinforcement are conducted, specifically, soil body excavation construction is conducted, soil bodies in the semicircular steel open caisson are excavated downwards, and leakage points of construction joints are exposed; repairing the leakage point structure of the construction joint; the invention further discloses a shallow layer closed drainage structure. The problem of leakage at the deformation joints of the two side faces of the box culvert in the main sewage line can be solved, and the repairing effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal construction, and in particular to a box culvert repair method and a shallow closed drainage structure. Background Art

[0002] See Figure 1 and Figure 2 This project is located at the end of the first-phase combined sewage main line in Shanghai (at the intersection of Gangcheng Road and Helong Road). The box culvert is a double-hole box culvert (the buried depth of the box culvert is 3m, and the inner size of a single hole is 4250mm×3500mm). After construction, a deformation joint (the width of the deformation joint is 50mm) is provided between adjacent box culverts. After long-term operation, it is found that there is a leakage risk at the deformation joint position of two sections of the box culvert ( Figure 2 In, side A is the outside of the box culvert, side B is the inside of the box culvert, the deformation joint 100 is shown in the figure, and the deformation joint has a staggered joint). For the top deformation joint, reinforcement repair was carried out using reinforced concrete in the early stage, but the leakage at the deformation joints on both sides of the box culvert still needs to be repaired (no leakage is found at the bottom deformation joint due to the extrusion effect). Since the daily flow of the box culvert is relatively large, about 30 - 50m 3 / s, it does not have the conditions for shutdown and maintenance. At the same time, there is an emptying pipe 22 above the right side of the box culvert (there is a water supply pipe 21 on one side of the emptying pipe), and the environment is complex. For the repair of the deformation joints on both sides, a box culvert repair method needs to be developed for disposal. Summary of the Invention

[0003] The purpose of the present invention is to provide a box culvert repair method that can repair the leakage at the deformation joints on two sides of the box culvert in the sewage main line.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A box culvert repair method, characterized by including the following steps:

[0005] (1) Shallow closed drainage:

[0006] S11. Sink DN3000 steel sleeves on both sides of the box culvert using the jacking method, one side to the elevation of the top of the box culvert, and the other side to the elevation of the top of the emptying pipe;

[0007] S12. Pump out the water and empty the inside of the two DN3000 steel sleeves, and excavate the shallow soil layer to the top of the box culvert to determine the boundary position of the box culvert. A diver operates underwater to cut and block the DN500 emptying pipe inside the steel sleeve; Insert a DN2400 semi-circular steel caisson inside the DN3000 steel casing;

[0008] S13. Perform MJS soil reinforcement on the outside and bottom of the steel sleeve, and on the bottom of the box culvert;

[0009] S14. Arrange a sand and gravel filter layer inside the steel sleeve, connect an external gravity flow pipeline to the sewage discharge well, close the top of the steel sleeve with a top cover and then connect an exhaust pipe, and set a dry chemical filter material at the outlet of the exhaust pipe;

[0010] (2) After removing the exhaust pipe, top cover and sand and gravel filter layer on the steel sleeve, conduct deep excavation and reinforcement:

[0011] S21. Carry out soil excavation construction, excavate the soil inside the semi-circular steel caisson to expose the leakage points of the construction joints;

[0012] S22. Repair the structure of the leakage points of the construction joints by using the first repair method or the second repair method;

[0013] The first repair method: If the leakage flow is small and the damage is light, fill the deformation joint between the box culverts with oil-soaked hemp rope and quick-drying cement, then press the steel plate cover, create dry construction conditions, implant steel bars, bind the structural steel bars, and then pour the concrete outer structure to complete the repair of the settlement joint structure;

[0014] The second repair method: If the leakage flow is large and the damage is relatively serious and dry construction conditions are not available, lower the steel reinforcement cage, use the semi-circular steel caisson as the external formwork, and directly carry out concrete pouring.

[0015] Furthermore, in the first repair method, when implanting steel bars and binding structural steel bars, chisel, wash and moisten the outer wall of the box culvert with a pneumatic pick, implant steel bars on the surface, then carry out the steel bar binding inside the well, and then carry out concrete pouring.

[0016] Furthermore, in step S3, when carrying out MJS soil reinforcement on the outside and bottom of the steel sleeve, the pile diameter is 2400 mm;

[0017] When carrying out MJS soil reinforcement on the bottom of the box culvert, the pile diameter is 2400 mm.

[0018] On the other hand, a shallow closed drainage structure, characterized in that it includes a first shallow closed drainage structure and a second shallow closed drainage structure:

[0019] The first shallow closed drainage structure includes a first steel sleeve (31), the first steel sleeve (31) is located on one side of the top of the box culvert, a first semi-circular steel caisson (32) is arranged inside the first steel sleeve (31), a first MJS soil reinforcement structure (33) is arranged on the outside and bottom of the first steel sleeve (31), a first sand and gravel filter material (34) is arranged inside the first steel sleeve (31), a first top cover (31a) is arranged on the top of the first steel sleeve (31), a first exhaust pipe (35) is arranged on the first top cover (31a), a first dry chemical filter material (35a) is arranged on the top of the first exhaust pipe (35), and the first steel sleeve (31) is connected to the sewage well through a connecting pipe;

[0020] The second shallow closed drainage structure includes a second steel sleeve (41). The second steel sleeve (41) is located on one side of the top of the culvert box and above the drain pipe (22). A second semi-circular steel caisson (42) is arranged inside the second steel sleeve (41). A second MJS soil reinforcement structure (43) is arranged on the outer side and the bottom of the second steel sleeve (41). A second sand and gravel filter material (44) is arranged inside the second steel sleeve (41). A second top cover (41a) is arranged on the top of the second steel sleeve (41). A second exhaust pipe (45) is arranged on the second top cover (41a). A second dry chemical filter material (45a) is arranged on the top of the second exhaust pipe (45). The second steel sleeve (41) is connected to the sewage well through a connecting pipe;

[0021] Wherein, a first culvert box bottom MJS soil reinforcement structure (61) located on one side and a second culvert box bottom MJS soil reinforcement structure (62) located on the other side are respectively arranged at the bottom of the culvert box.

[0022] Furthermore, the first sand and gravel filter material includes a first sand filter material, and a first stone filter material is arranged on the first sand filter material.

[0023] Furthermore, the first dry chemical filter material is arranged on the top of the first exhaust pipe.

[0024] Compared with the prior art, the present invention has the following beneficial effects: The present invention can repair the leakage problem of the deformation joints (two side deformation joints) of the culvert box in the sewage main line, and the repair effect is good. Description of the Drawings

[0025] Figure 1 It is a cross-sectional view of the culvert box in the background art.

[0026] Figure 2 It is a structural diagram at the deformation joint of the culvert box.

[0027] Figure 3 It is an example of the shallow closed drainage structure.

[0028] Figure 4 It is an example of the top view state of the first steel sleeve, the first semi-circular steel caisson, the second steel sleeve and the second semi-circular steel caisson.

[0029] Figure 5 It is an example of the repair structure formed by the first repair method. The steel bar part 5a and the concrete part 5b are shown in the figure.

[0030] Description of reference numerals: 100 deformation joint, 21 water supply pipe, 22 vent pipe (water supply vent pipe), 31 first steel sleeve, 31a first top cover, 32 first semi-circular steel caisson, 33 first MJS soil reinforcement structure, 34 first sand and gravel filter layer, 35 first exhaust pipe, 35a first dry chemical filter material, 41 second steel sleeve, 41a second top cover, 42 second semi-circular steel caisson, 43 second MJS soil reinforcement structure, 44 second sand and gravel filter layer, 45 second exhaust pipe, 45a second dry chemical filter material, 5a steel bar part, 5b concrete part, 6 third MJS soil reinforcement structure. Detailed implementation manners

[0031] Embodiment 1

[0032] This embodiment relates to a method for repairing a box culvert, which includes the following steps:

[0033] (1) Shallow closed drainage:

[0034] S11. Use the press sinking method to sink DN3000 steel sleeves on both sides of the box culvert, one side to the elevation of the top of the box culvert and the other side to the elevation of the top of the vent pipe.

[0035] S12. Pump out and empty the water in the two DN3000 steel sleeves and excavate the shallow soil layer to the top of the box culvert to determine the boundary position of the box culvert. A diver performs underwater operations to cut and block the DN500 vent pipe in the steel sleeve (cutting and blocking the vent pipe in the steel sleeve to avoid the influence of the vent pipe on the construction, and it can be restored according to the actual situation later, just bypass the steel sleeve area, for example, re-set the vent pipe or connect the two blocked ends with a connecting pipe); insert a DN2400 semi-circular steel caisson inside the DN3000 steel casing.

[0036] S13. Perform MJS soil reinforcement on the outside and bottom of the steel sleeve, and on the bottom of the box culvert. The MJS method can refer to the existing technology.

[0037] S14. Arrange a sand and gravel filter layer in the steel sleeve, connect an external gravity flow pipeline to the sewage discharge well (the sewage filtered by the sand and gravel filter layer is discharged to the sewage discharge well), close the top of the steel sleeve with a top cover and then connect an exhaust pipe, and set a dry chemical filter material at the outlet of the exhaust pipe (filter the discharged gas).

[0038] (2) After removing the exhaust pipe, top cover and sand and gravel filter layer on the steel sleeve, perform deep excavation and reinforcement:

[0039] S21. Carry out soil excavation construction, excavate the soil inside the semi-circular steel caisson to expose the leakage points of the construction joint.

[0040] S22. The structural repair of the leakage points of the construction joint is carried out by using the first repair method or the second repair method, and it is specifically selected according to the actual situation;

[0041] The first repair method: If the leakage point has a small flow rate and minor damage, the deformation joint (leakage point) between the box culverts is filled with oil-soaked hemp braid and quick-drying cement (oil-soaked hemp braid is added to the quick-drying cement, and the quick-drying cement mixed with the oil-soaked hemp braid is filled in the required position. During this process, if drainage is needed, that is, before filling the quick-drying cement, a drainage pipe is inserted at the leakage point to let the water flow out through the drainage pipe to reduce the impact of water on the quick-drying cement. As the quick-drying cement is filled, the drainage pipe is gradually pulled out, and the hole left by the drainage pipe is promptly sealed with cement), and then a steel plate pressing cover (the steel plate is pressed on the outside of the quick-drying cement, and the steel plate can be set by means of support bracing, etc.) is used to create dry working (create a relatively dry environment) conditions, followed by implanting steel bars, tying structural steel bars, and then pouring concrete for the outer package structure to complete the repair of the settlement joint structure (that is, concrete is poured outside the deformation joint for repair, and the repair effect is shown in Figure 5 ).

[0042] The second repair method: If the leakage point has a large flow rate and serious damage and dry working conditions are not available, lower the steel reinforcement cage, use a semi-circular steel open caisson as the outer mold, and directly pour concrete (repair is carried out in the semi-circular steel open caisson in the manner of steel reinforcement cage + concrete).

[0043] In the first repair method, when implanting steel bars and tying structural steel bars, the outer wall of the box culvert is roughened, washed, and wetted with a pneumatic pick, steel bars are implanted on the surface, then the steel bars are tied inside the well, and then concrete is poured.

[0044] In step S3, when performing MJS soil reinforcement on the outside and bottom of the steel sleeve, the pile diameter is 2400 mm; when performing MJS soil reinforcement on the bottom of the box culvert, the pile diameter is 2400 mm.

[0045] The present invention can repair the leakage problem of the deformation joints (at the two side deformation joints) of the box culverts in the sewage main line, and has a good repair effect.

[0046] Embodiment 2

[0047] Refer to Figure 3 and Figure 4 , this embodiment relates to a shallow closed drainage structure, including a first shallow closed drainage structure and a second shallow closed drainage structure:

[0048] The first shallow closed drainage structure includes a first steel sleeve 31, the first steel sleeve 31 is located on one side of the top of the box culvert, a first semi-circular steel open caisson 32 is arranged inside the first steel sleeve 31, a first MJS soil reinforcement structure 33 is arranged on the outside and bottom of the first steel sleeve 31, a first sand and gravel filter material 34 is arranged inside the first steel sleeve 31, a first top cover 31a is arranged on the top of the first steel sleeve 31, a first exhaust pipe 35 is arranged on the first top cover 31a, a first dry chemical filter material 35a is arranged on the top of the first exhaust pipe 35, and the first steel sleeve 31 is connected to the sewage well through a connecting pipe.

[0049] The second shallow closed drainage structure includes a second steel sleeve 41, which is located on one side of the top of the culvert box and above the emptying pipe 22. A second semi-circular steel caisson 42 is arranged inside the second steel sleeve 41. A second MJS soil reinforcement structure 43 is arranged on the outer side and the bottom of the second steel sleeve 41. A second sand and gravel filter material 44 is arranged inside the second steel sleeve 41. A second top cover 41a is arranged on the top of the second steel sleeve 41. A second exhaust pipe 45 is arranged on the second top cover 41a. A second dry chemical filter material 45a is arranged on the top of the second exhaust pipe 45. The second steel sleeve 41 is connected to the sewage well through a connecting pipe.

[0050] Among them, a first culvert box bottom MJS soil reinforcement structure 61 located on one side and a second culvert box bottom MJS soil reinforcement structure 62 located on the other side are respectively arranged at the bottom of the culvert box.

[0051] In the embodiment, the first sand and gravel filter material includes a first sand filter material, and a first stone filter material is arranged on the first sand filter material.

[0052] In the embodiment, the first dry chemical filter material is arranged on the top of the first exhaust pipe.

[0053] The shallow closed drainage structure can filter and discharge the leaked sewage, and at the same time filter the discharged air, avoiding affecting the surrounding environment during the construction process and creating favorable conditions for the subsequent construction.

[0054] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any technical solution belonging to the principle of the present invention belongs to the protection scope of the present invention. For those skilled in the art, several improvements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A box culvert repair method, characterized in that: The steps include: (I) Shallow closed drainage: S11. Use the pressure sinking method to sink DN3000 steel sleeves on both sides of the box culvert, one side to the top elevation of the box culvert, and the other side to the top elevation of the vent pipe; S12. Pump out water from the DN3000 steel sleeves on both sides and excavate the shallow soil to the top of the box culvert to determine the boundary position of the box culvert. Divers cut and seal the DN500 vent pipe in the steel sleeve through underwater operations; insert a DN2400 semicircular steel caisson inside the DN3000 steel casing; S13, the outer side and bottom of the steel sleeve, and the bottom of the box culvert are reinforced with MJS soil; S14. Arrange a sand and gravel filter layer in the steel sleeve, connect a gravity flow pipe to the sewage discharge well, close the top of the steel sleeve with a top cover and connect it to an exhaust pipe, and set a dry chemical filter at the outlet of the exhaust pipe; (II) After removing the exhaust pipe, top cover and sand and gravel filter layer on the steel sleeve, deep excavation and reinforcement: S21, soil excavation construction, digging down the soil in the semi-circular steel caisson to expose the leakage points of the construction joints; S22: The structural repair of the leakage point of the construction joint is carried out by using the first repair method or the second repair method; The first repair method: If the flow rate of the leakage point is small and the damage is light, the deformation joints between the box culverts are filled with oil-soaked hemp braids and quick-drying cement, and then covered with steel plates. After creating dry working conditions, the reinforcement is planted, the structural reinforcement is tied, and the concrete outer package structure is poured to complete the structural repair of the settlement joint; The second repair method: If the flow rate at the leakage point is large and the damage is serious, and dry operation conditions are not available, sink the steel cage, use the semi-circular steel caisson as the outer formwork, and directly pour concrete.

2. The box culvert repair method according to claim 1, characterized in that: In the first repair method, when planting and tying structural steel bars, the outer wall of the box culvert is roughened, washed and moistened with a pneumatic pick, and the surface is planted with steel bars. Then the steel bars are tied inside the well and then the concrete is poured.

3. The box culvert repair method according to claim 1, characterized in that: In step S3, when the MJS soil reinforcement is performed on the outside and bottom of the steel sleeve, the pile diameter is 2400 mm; When MJS soil reinforcement is performed at the bottom of the box culvert, the pile diameter is 2400mm.

4. A shallow closed drainage structure, characterized in that: It includes a first shallow closed drainage structure and a second shallow closed drainage structure: The first shallow closed drainage structure comprises a first steel sleeve (31), the first steel sleeve (31) is located at one side of the top of the box culvert, a first semicircular steel caisson (32) is arranged in the first steel sleeve (31), a first MJS soil reinforcement structure (33) is arranged outside and at the bottom of the first steel sleeve (31), a first sand and gravel filter material (34) is arranged in the first steel sleeve (31), a first top cover (31a) is arranged on the top of the first steel sleeve (31), a first exhaust pipe (35) is arranged on the first top cover (31a), a first dry chemical filter material (35a) is arranged on the top of the first exhaust pipe (35), and the first steel sleeve (31) is connected to the sewage well through a connecting pipe; The second shallow closed drainage structure comprises a second steel sleeve (41), the second steel sleeve (41) is located on one side of the top of the box culvert and above the drain pipe (22), a second semicircular steel caisson (42) is arranged in the second steel sleeve (41), a second MJS soil reinforcement structure (43) is arranged outside and at the bottom of the second steel sleeve (41), a second sand and gravel filter material (44) is arranged in the second steel sleeve (41), a second top cover (41a) is arranged on the top of the second steel sleeve (41), a second exhaust pipe (45) is arranged on the second top cover (41a), a second dry chemical filter material (45a) is arranged on the top of the second exhaust pipe (45), and the second steel sleeve (41) is connected to the sewage well through a connecting pipe; The box culvert bottom is provided with a first box culvert bottom MJS soil reinforcement structure (61) located on one side and a second box culvert bottom MJS soil reinforcement structure (62) located on the other side.

5. The shallow closed drainage structure according to claim 4, characterized in that: The first sand and gravel reverse filter material comprises a first sand reverse filter material, and a first stone reverse filter material is arranged on the first sand reverse filter material.

6. The shallow closed drainage structure according to claim 4, characterized in that: The first dry chemical filter is arranged on the top of the first exhaust pipe.

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