Construction method for temporary aqueduct of urban river channel

Abstract

The invention discloses a construction method of an urban river temporary aqueduct, which comprises the following steps: excavating a foundation pit at a to-be-constructed position of a subway accessory structure, and removing all circular pipe culverts at the intersection position of the foundation pit and a river; foundation pit support structures are constructed on the two opposite sides, perpendicular to the river channel direction, of the foundation pit; a plurality of cast-in-place piles are constructed at the intersection position of the foundation pit and the river channel in the length direction of the river channel at intervals, and a latticed column is inserted into each cast-in-place pile; a U-shaped box culvert used for replacing the dismantled circular pipe culvert for water supply is constructed at the intersection position of the foundation pit and the river channel in the length direction of the river channel, a bottom plate of the U-shaped box culvert is supported on the tops of the latticed columns and pressed on the two rows of foundation pit enclosure structures, and the two ends of the U-shaped box culvert communicate with the circular pipe culvert which is not dismantled; after the U-shaped box culvert is maintained, the subway accessory structure is constructed. Through the construction method, the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a construction method for a temporary aqueduct in a city river. Background Art

[0002] The main structure of the subway station is located directly below the main urban road, with a large traffic volume. According to the traffic plan formulated by the traffic control department, a temporary guide road 12 must be built first, and then the main road must be closed for station construction. Combined with the on-site environment, there is a secondary urban river next to the main road, which has the functions of regulating and flood control. Due to the need for traffic guidance, the water management department was coordinated to agree to temporarily occupy and transform the river, as shown in the attached figure Figure 2 As shown: Two reinforced concrete circular culverts 2 with an inner diameter of 2.8m are buried in the river channel to meet the water flow capacity of not less than 4m 3 / s, and then backfill the river channel to bury the circular culvert 2, and finally build a temporary guide road 12 along the length of the river channel on the backfill material 11 to meet the traffic of vehicles and pedestrians. After the main structure of the station is completed, the main road of the city will be restored.

[0003] According to the construction process of the subway station, the subway auxiliary structure (auxiliary air duct and entrances and exits) is constructed after the main structure of the subway station is completed. The subway auxiliary structure is located on both sides of the main structure of the subway station, one of which needs to cross the river beside the main road from the bottom of the circular culvert. The foundation pit excavation of the subway auxiliary structure adopts the open excavation method from top to bottom. It is inevitable that part of the circular culvert is within the scope of the foundation pit excavation. It happens that the construction during the flood season cannot cut off the water supply to the river for a long time. How to deal with the construction of the subway auxiliary structure and the flood control of the river becomes the key to solving the problem. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a temporary aqueduct for urban rivers, which can ensure the water flow requirements of the river during the flood season without affecting the construction of subway auxiliary structures, thereby improving the construction efficiency.

[0005] To achieve the above object, the technical solution adopted by the present invention is a construction method of a temporary aqueduct in an urban river, comprising the following steps:

[0006] Step 1: Excavate the foundation pit at the location where the subway auxiliary structure is to be constructed until the bottom design elevation of the subway auxiliary structure is reached, and remove all the circular culverts at the intersection of the foundation pit and the river channel;

[0007] Step 2: constructing a foundation pit retaining structure on two opposite sides of the foundation pit perpendicular to the direction of the river channel, so that the top of the foundation pit retaining structure is flush with the bottom of the circular culvert that has not been removed;

[0008] Step 3: constructing a plurality of cast-in-place piles at intervals along the length direction of the river channel at the intersection of the foundation pit and the river channel, and inserting a lattice column into each of the cast-in-place piles so that the top of the lattice column is flush with the bottom of the circular culvert that has not been removed;

[0009] Step 4: construct end walls at the positions of the circular culverts that have not been removed on both sides of the foundation pit, respectively, so that the end walls are connected to the side walls of the foundation pit, and reserve through holes on the end walls so that the through holes are connected to the water holes of the corresponding circular culverts that have not been removed;

[0010] Step 5: constructing a U-shaped box culvert for replacing the dismantled circular culvert along the length direction of the river channel at the intersection of the foundation pit and the river channel, supporting the bottom plate of the U-shaped box culvert on the top of the plurality of lattice columns and pressing on two rows of the foundation pit retaining structures, connecting the two ends of the U-shaped box culvert to the two end walls respectively, and enclosing the through hole in a U-shaped space enclosed by the bottom plate of the U-shaped box culvert and the two side walls of the U-shaped box culvert;

[0011] Step 6: After the maintenance of the U-shaped box culvert is completed, a subway auxiliary structure is constructed below the U-shaped box culvert.

[0012] A further improvement of the construction method of a temporary aqueduct in an urban river of the present invention is that before executing the above step 1, water retaining dams are respectively constructed at the water inlet and outlet of the circular culvert to temporarily cut off the flow in the circular culvert, and the water retaining dams are removed after the maintenance of the U-shaped box culvert is completed.

[0013] A further improvement of the construction method of a temporary aqueduct in an urban river of the present invention is that, before executing the above step 3 and after executing the above step 2, a crown beam is constructed on the top of the two rows of foundation pit retaining structures, and when executing the above step 5, the bottom plate is pressed on the crown beam.

[0014] A further improvement of the construction method of the temporary aqueduct of an urban river in the present invention is that after the bottom plate is pressed onto the crown beam, grouting reinforcement is performed at the intersection of the bottom plate and the crown beam.

[0015] A further improvement of the construction method of a temporary aqueduct in an urban river of the present invention is that, when executing the above step 3, two rows of cast-in-place piles are driven at intervals along the length direction of the river, and the lattice column is inserted into each cast-in-place pile.

[0016] A further improvement of the construction method of a temporary aqueduct in an urban river of the present invention is that, before executing the above step 4 and after executing the above step 3, two support beams are constructed on the top of the two rows of lattice columns, so that each of the support beams is connected in series with the corresponding row of lattice columns, and when executing the above step 5, the bottom plate is supported on the two support beams.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] The U-shaped box culvert is constructed to ensure water flow through the river during the flood season, and its overhead setting does not affect the construction of the subway auxiliary structure below, thereby improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a top view of the structure of the temporary aqueduct of the urban river of the present invention.

[0021] Figure 2 The diagram is a temporary guide road diagram of a temporary aqueduct in an urban river according to the present invention.

[0022] Figure 3 The figure is a schematic diagram of the U-shaped box culvert connection of the temporary aqueduct of the urban river according to the present invention.

[0023] Figure 4 The figure is a schematic diagram of the connection between the U-shaped box culvert and the circular culvert of the temporary aqueduct of the urban river of the present invention.

[0024] In the figure: 1. River channel; 2. Circular culvert; 3. U-shaped box culvert; 301. Bottom plate; 302. Side wall; 4. Cast-in-place piles; 5. Lattice column; 6. Foundation pit retaining structure; 7. End wall; 8. Grouting reinforcement; 9. Water-stop curtain; 10. Support beam; 11. Backfill material; 12. Temporary guide road. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] The construction method of the temporary aqueduct in an urban river of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figure 1 to Figure 4 As shown, the construction method of a temporary aqueduct in an urban river comprises the following steps:

[0028] Step 1: excavate a foundation pit at the location where the subway auxiliary structure is to be constructed, until the excavation reaches the bottom design elevation of the subway auxiliary structure, and completely remove the circular culvert 2 at the intersection of the foundation pit and the river channel 1;

[0029] Specifically, when dismantling the circular culvert 2 at the intersection of the foundation pit and the river channel 1, firstly, all the backfill materials 11 outside the circular culvert 2 are excavated, and then the circular culvert 2 and the lower foundation are completely dismantled.

[0030] Step 2: constructing a foundation pit retaining structure 6 on two opposite sides of the foundation pit perpendicular to the river channel 1, so that the top of the foundation pit retaining structure 6 is flush with the bottom of the circular culvert 2 that has not been removed;

[0031] Specifically, the foundation pit retaining structure 6 is a three-axis cement-soil mixing pile, and a steel section is inserted into the three-axis cement-soil mixing pile. The steel section is arranged in the three-axis cement-soil mixing pile at intervals of one.

[0032] Step 3: construct multiple cast-in-place piles 4 at intervals along the length direction of the river channel 1 at the intersection of the foundation pit and the river channel 1, and insert a lattice column 5 into each cast-in-place pile 4 so that the top of the lattice column 5 is flush with the bottom of the circular culvert 2 that has not been removed;

[0033] Step 4: construct end walls 7 at the positions of the circular culverts 2 that have not been removed on both sides of the foundation pit, connect the end walls 7 with the side walls of the foundation pit, and reserve through holes on the end walls 7 to communicate with the water holes of the corresponding circular culverts 2 that have not been removed;

[0034] Specifically, a ring beam for protecting the through hole is also connected in the through hole, and the ring beam is connected to the inner periphery of the through hole, and the inner diameter of the ring beam is the same as the inner diameter of the water passage opening.

[0035] Specifically, when constructing the end wall 7, firstly, the soil around the pipe opening of the circular culvert 2 that has not been removed is excavated to expose the pipe opening of the circular culvert 2 that has not been removed, and then a waterproof adhesive strip is pasted on the pipe opening of the circular culvert 2 that has not been removed. Finally, the end wall 7 and the ring beam are constructed, and the pipe opening of the circular culvert 2 that has not been removed is connected to the ring beam.

[0036] Through the above construction method, the pipe opening of the circular culvert 2 that has not been removed is completely buried inside the ring beam, thereby avoiding leakage between the circular culvert 2 that has not been removed and the end wall 7.

[0037] Step 5: construct a U-shaped box culvert 3 for replacing the dismantled circular culvert 2 for passing water at the intersection of the foundation pit and the river channel 1 along the length direction of the river channel 1, support the bottom plate 301 of the U-shaped box culvert 3 on the top of the plurality of lattice columns 5 and press on two rows of the foundation pit retaining structures 6, connect the two ends of the U-shaped box culvert 3 to the two end walls 7 respectively, and enclose the through hole in a U-shaped space enclosed by the bottom plate 301 of the U-shaped box culvert 3 and the two side walls 302 of the U-shaped box culvert 3;

[0038] Specifically, the U-shaped box culvert 3 includes a bottom plate 301 arranged in a horizontal direction and two side walls 302 vertically connected to opposite sides of the bottom plate 301 .

[0039] Specifically, as attached Figure 1 As shown: when the diameter of the through hole is larger than the distance between the two side walls 302, the two side walls 302 and the bottom plate 301 are extended to both sides in an eight-shaped shape to form a trumpet mouth to completely cover the through hole, thereby ensuring the water flow effect and avoiding leakage.

[0040] Step 6: After the maintenance of the U-shaped box culvert 3 is completed, a subway auxiliary structure is constructed below the U-shaped box culvert 3 .

[0041] Specifically, as attached Figure 1 And attached Figure 4 As shown: after the construction of the U-shaped box culvert 3 is completed, a water-stop curtain 9 is constructed at the junction of the side wall 302 and the foundation pit retaining structure 6. The bottom elevation of the water-stop curtain 9 is at least 2m below the bottom surface of the base plate 301. The water-stop curtain 9 is a high-pressure rotary jet pile.

[0042] By providing the water-stopping curtain 9, the water-stopping effect is improved.

[0043] Specifically, the opposite inner sides of the two side walls 302 of the U-shaped box culvert 3 and the top of the bottom plate 301 are coated with waterproof paint.

[0044] Specifically, the waterproof coating is a single-component polyurethane, and the coating thickness is not less than 2mm.

[0045] By applying the waterproof coating, leakage can be avoided when the U-shaped box culvert 3 passes water.

[0046] Since the junction between the U-shaped box culvert 3 and the unremoved circular culvert 2 is the most prone to leakage, an end wall 7 is first constructed at the location of the unremoved circular culvert 2, and then the end wall 7 is connected to the U-shaped box culvert 3, thereby improving the waterproof effect.

[0047] Preferably, before executing the above step 1, water retaining dams are constructed at the water inlet and outlet of the circular culvert 2 to temporarily cut off the flow in the circular culvert 2, and the water retaining dams are removed after the maintenance of the U-shaped box culvert 3 is completed.

[0048] Preferably, before executing the above step 3 and after executing the above step 2, a crown beam is constructed on the top of the two rows of the foundation pit retaining structures 6, and when executing the above step 5, the bottom plate 301 is pressed on the crown beam.

[0049] Specifically, the crown beam is matched with the bottom plate 301 .

[0050] By arranging the foundation pit retaining structure 6 and connecting the crown beam to the foundation pit retaining structure 6 , the overall stability of the foundation pit retaining structure 6 and the supporting effect of the bottom plate 301 are enhanced.

[0051] Preferably, after the bottom plate 301 is pressed onto the crown beam, grouting reinforcement 8 is performed at the intersection of the bottom plate 301 and the crown beam.

[0052] Since the foundation pit retaining structure 6 is a three-axis cement-soil mixing pile, the cap beam must be constructed after the pile top is chiseled out. The interface between the two is prone to water seepage, so grouting reinforcement 8 is performed on the soil outside the interface between the two to reduce the porosity of the soil and block the seepage channel for submersion into the foundation pit.

[0053] Preferably, when performing the above step 3, two rows of cast-in-place piles 4 are driven in intervals along the length direction of the river channel 1, and the lattice column 5 is inserted into each cast-in-place pile 4.

[0054] Specifically, the pile diameter of the cast-in-place pile 4 is 1m, and the pile length consists of an effective pile length part at the bottom and a hollow drilled part at the top. The effective pile length part is located below the bottom design elevation of the subway auxiliary structure, and the hollow drilled part is located above the bottom design elevation of the subway auxiliary structure. C30 underwater concrete is poured in the effective pile length part, and the bottom 3m of the lattice column 5 is inserted within the range of the effective pile length end of the cast-in-place pile 4, and the remaining part is located in the hollow drilled part.

[0055] Specifically, the distance between two rows of cast-in-place piles 4 is controlled to be between 4m and 5m, and the distance between two adjacent cast-in-place piles 4 in each row of cast-in-place piles 4 is controlled to be between 8.5m and 9.5m.

[0056] Preferably, before executing the above step 4 and after executing the above step 3, two support beams 10 are constructed on the top of the two rows of lattice columns 5, so that each of the support beams 10 is connected in series with the corresponding row of lattice columns 5, and when executing the above step 5, the base plate 301 is supported on the two support beams 10.

[0057] By providing two support beams 10 to connect two rows of lattice columns 5 to form a whole for the bottom plate 301 to rest on, the support effect of the U-shaped box culvert 3 is improved.

[0058] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0059] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for a temporary aqueduct in an urban river, characterized in that: Includes steps: Step 1: Excavate the foundation pit at the location where the subway auxiliary structure is to be constructed until the bottom design elevation of the subway auxiliary structure is reached, and remove all the circular culverts at the intersection of the foundation pit and the river channel; Step 2: constructing a foundation pit retaining structure on two opposite sides of the foundation pit perpendicular to the direction of the river channel, so that the top of the foundation pit retaining structure is flush with the bottom of the circular culvert that has not been removed; Step 3: constructing a plurality of cast-in-place piles at intervals along the length direction of the river channel at the intersection of the foundation pit and the river channel, and inserting a lattice column into each of the cast-in-place piles so that the top of the lattice column is flush with the bottom of the circular culvert that has not been removed; Step 4: construct end walls at the positions of the circular culverts that have not been removed on both sides of the foundation pit, respectively, so that the end walls are connected to the side walls of the foundation pit, and reserve through holes on the end walls so that the through holes are connected to the water holes of the corresponding circular culverts that have not been removed; Step 5: constructing a U-shaped box culvert for replacing the dismantled circular culvert along the length direction of the river channel at the intersection of the foundation pit and the river channel, supporting the bottom plate of the U-shaped box culvert on the top of the plurality of lattice columns and pressing on two rows of the foundation pit retaining structures, connecting the two ends of the U-shaped box culvert to the two end walls respectively, and enclosing the through hole in a U-shaped space enclosed by the bottom plate of the U-shaped box culvert and the two side walls of the U-shaped box culvert; Step 6: After the maintenance of the U-shaped box culvert is completed, a subway auxiliary structure is constructed below the U-shaped box culvert.

2. The construction method of a temporary aqueduct in an urban river as claimed in claim 1, characterized in that: Before executing the above step 1, water retaining dams are constructed at the water inlet and outlet of the circular culvert to temporarily cut off the flow in the circular culvert, and the water retaining dams are removed after the maintenance of the U-shaped box culvert is completed.

3. The construction method of a temporary aqueduct in an urban river as claimed in claim 1, characterized in that: Before executing the above step 3 and after executing the above step 2, a crown beam is constructed on the top of the two rows of the foundation pit retaining structures, and when executing the above step 5, the bottom plate is pressed on the crown beam.

4. The construction method of a temporary aqueduct in an urban river as claimed in claim 3, characterized in that: After the bottom plate is pressed onto the crown beam, grouting reinforcement is performed at the intersection of the bottom plate and the crown beam.

5. The construction method of a temporary aqueduct in an urban river as claimed in claim 1, characterized in that: When executing the above step 3, two rows of cast-in-place piles are driven in intervals along the length direction of the river channel, and the lattice column is inserted into each cast-in-place pile.

6. The construction method of a temporary aqueduct in an urban river as claimed in claim 5, characterized in that: Before executing the above step 4 and after executing the above step 3, two support beams are constructed on the top of the two rows of lattice columns, so that each of the support beams is connected in series with the corresponding row of lattice columns. When executing the above step 5, the bottom plate is supported on the two support beams.

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