Underground space comprehensive utilization method for co-construction of municipal jacking pipe and underground loop

Abstract

The invention belongs to the field of construction, and particularly relates to an underground space comprehensive utilization method which comprises the following steps: 1) a design stage; (2) a supporting engineering construction stage; glass fiber reinforced polymer support piles are used for construction at the positions where the support piles coincide with the later municipal pipe jacking channel; 3) a loop main body construction stage; a structural cavity is reserved in the loop main body structure so that municipal jacking pipes can conveniently penetrate in the later period. And (4) in the municipal pipe jacking construction stage, when pipe jacking construction is conducted to the position of the supporting pile, construction continues after the glass fiber rib supporting pile is broken. The positions of municipal pipelines and urban underground space loops are reasonably planned, and the construction safety risk in the whole process is reduced by reducing the excavation depth of the foundation pit; meanwhile, the work amount of earth excavation, outward transportation and backfilling is also reduced, and the construction cost is synchronously reduced.

Description

Technical Field

[0001] The invention belongs to the field of construction, and specifically relates to a method for comprehensive utilization of underground space by co-constructing a municipal jacking pipe and an underground loop. Background Art

[0002] With the continuous growth of urban population, the transportation facilities in old urban areas are obviously unable to meet the demand. Since then, the planning and construction of new urban areas have been put on the agenda. Whenever it comes to the overall planning of new areas, the application of urban underground space, such as integrated pipe corridors and underground loops, cannot be avoided. Taking the urban underground loop and the later planned ground roads as an example, there is inevitably a plane intersection between the two. In order to ensure the buried depth requirements of the planned road pipelines, the buried depth of the main structure of the loop can only be increased. The general structural size of the currently planned municipal pipelines is 2m, which undoubtedly further increases the project cost and construction difficulty under the premise of ensuring the buried depth. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for comprehensive utilization of underground space.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A method for comprehensive utilization of underground space by co-constructing a municipal jacking pipe and an underground loop road, comprising the following steps: 1) a design stage; 2) a support engineering construction stage; glass fiber reinforced support piles are used to construct the position where the support pile position coincides with the position of a later municipal jacking pipe passage; 3) a loop road main body construction stage; a structural cavity is reserved in the loop road main body structure for the later passage of the municipal jacking pipe; 4) a municipal jacking pipe construction stage; when the jacking pipe is constructed to the support pile position, the glass fiber reinforced support pile is removed and construction continues.

[0005] The specific steps of step 2) are: construct support piles, including steel support piles and glass fiber reinforced support piles; the glass fiber reinforced support piles are used at the location where they overlap with the later municipal jacking channel; the size of the steel support piles and glass fiber reinforced support piles is 1000mm@1700mm, the main reinforcement of the steel support piles is 18 C25 threaded steel bars, spiral stirrups A8@150, and the reinforcement stirrups are C25@2000. The steel bars of the support piles at specific locations are made of glass fiber reinforced bars, which are convenient for the later municipal jacking to be broken before the top is broken.

[0006] High-pressure rotary jet piles are constructed between adjacent supporting piles; the pile diameter of the high-pressure rotary jet piles is ≥800mm, and they are constructed using the double-tube method with cement slurry as the medium; their functions are to consolidate sand and stop water, ensure soil stability during the loop support project and the jacking process, and ensure the safety and quality of the construction process.

[0007] The specific steps of step 3) are: construct a structural cavity above the underground loop passage of the loop main structure; construct an endless wall loop cavity reserved for the passage of the municipal jacking pipe in the structural cavity; the endless wall loop cavity includes a top plate, a bottom plate and a side wall; the endless wall loop cavity refers to the endless wall design at the front and rear ends of the jacking pipe path (brick walls are used to seal it after the jacking pipe construction is completed) to facilitate the jacking pipe to pass through the cavity; hidden columns are arranged in the side walls.

[0008] The thickness of the top and bottom plates of the loop cavity without end walls is 500mm, and the thickness of the side walls is 500mm; the bottom of the side walls is a 500×1500mm frame beam.

[0009] A fully enclosed waterproof structure is constructed in the underground loop cavity; the waterproof structure is an SBS polyester tire modified asphalt type II waterproof membrane and a felt waterproof protective layer; a waterproof protective layer is also arranged on the bottom plate of the underground loop cavity; the waterproof protective layer is 70mm thick and adopts C20 fine stone concrete with a layer of A6@200×200 steel mesh.

[0010] The method for breaking the fiberglass reinforcement support pile in step 4) is as follows: (1) using a pneumatic pick to remove the concrete wrapped around the reinforcement from top to bottom or from the side; (2) within the breaking range, 2 to 4 steel chisels are driven symmetrically at the same angle along the upper and lower horizontal planes of the fiberglass reinforcement support pile, and the concrete is cut off by hitting symmetrically with a sledgehammer at the same time; (3) for the fiberglass reinforcement skeleton that is not completely cut off, it is cut off by manual labor and machinery.

[0011] Pipe stabilizing concrete is set at the bottom of the jacking pipe.

[0012] After the jacking construction is completed, the cavity is sealed; brick walls are used to seal the underground loop cavity to ensure that there is no gap between the brick wall and the municipal jacking pipe section; then mortar is applied on the brick wall, and a waterproof and polystyrene board protective layer is applied.

[0013] The municipal jacking pipes include rainwater jacking pipes and sewage jacking pipes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By rationally planning the location of municipal pipelines and urban underground space loops and reducing the depth of foundation pit excavation, the safety risk of the entire construction process is reduced; at the same time, the amount of earth excavation, transportation, and backfilling is also reduced, and the project cost is simultaneously reduced.

[0015] 2. By setting up reserved cavity channels for the underground loop structure, the amount of concrete and steel bars used in the main structure can be saved; while reducing the cost, the construction progress can be accelerated to ensure the construction period.

[0016] 3. From the perspective of overall urban planning and design and underground space resource utilization, the utilization of limited land space has been strengthened, land resources have been saved, and the three-dimensional development of new cities has been further promoted. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the construction process of the underground space comprehensive utilization method of the present invention; Figure 2 It is a plane schematic diagram of the construction process of the underground space comprehensive utilization method of the present invention; Figure 3 It is a longitudinal section view of the construction process of the underground space comprehensive utilization method of the present invention without loop blocking construction; Figure 4 It is a longitudinal section view after the loop blocking construction during the construction process of the underground space comprehensive utilization method of the present invention; Figure 5 It is a cross-sectional view of the rainwater top pipe during the construction process of the underground space comprehensive utilization method of the present invention; Figure 6 It is a cross-sectional view of the sewage jacking pipe during the construction process of the underground space comprehensive utilization method of the present invention. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiments.

[0019] Example 1: A method for comprehensive utilization of underground space by co-constructing municipal pipe jacking and underground loop ( Figure 1 ), comprising the following steps: 1) Design stage: Comprehensively consider the support design scheme on the premise of mastering the plane positions of the later planned roads and municipal jacking pipes (including rainwater jacking pipes 1 and sewage jacking pipes 2); 1.1) When the position of the support piles coincides with the position of the municipal jacking channel in the later stage, it indicates that the support piles at this location need to be broken and transported out in the later stage. However, considering that ordinary steel support piles are difficult to break, the steel support piles 5 are optimized to glass fiber reinforced support piles 7 to facilitate the breaking of the support piles at this location in the later stage; 1.2) Consider the potential risks of soil loss and hole collapse between piles caused by the later pipe jacking construction; it is easy to cause quality problems such as settlement and collapse of municipal pipe jacking and ground roads, affecting secondary construction or increasing construction costs. Secondary optimization of the support form on the pipe jacking path, adding high-pressure rotary jet piles 6 between the support piles, and re-spraying at locations with thicker sand layers when necessary to play a role in sand consolidation and water stopping, and prevent repeated collapse during pipe jacking, ground collapse after municipal road construction and other quality problems; 1.3) A method of reserving a structural cavity in the main structure of the loop is adopted to facilitate the later passage of the municipal jacking pipe; a loop cavity is reserved in the reserved structural cavity by adding a structural design form of hidden beams and hidden columns, and the side wall structure close to the supporting piles on both sides is designed as an endless wall; and the loop cavity is waterproofed; 1.4) Considering that the cavity structure cannot be completely closed after the jacking pipe is pushed in, the backfill soil of the fertilizer trough may continue to flow into the cavity, causing the backfill to be unrealistic, the fertilizer trough to sink, and then cause ground settlement and road collapse; or the soil settlement under the jacking pipe section in the cavity may cause the pipe section to be disconnected, seepage, and settlement, which may cause serious quality accidents. When designing the loop structure, it is considered that after the jacking pipe is completed, the loop cavity is blocked with a brick wall to ensure that the soil in the fertilizer trough and the cavity does not flow into each other, and to ensure the quality and safety of the three intersecting unit projects of the municipal jacking pipe, underground space loop, and ground road in the later stage.

[0020] 2) Support engineering construction stage: glass fiber reinforced support piles are used to construct the support piles where the support piles overlap with the later municipal jacking pipe channel; conventional construction technology is used for support pile construction and high-pressure jet grouting pile construction; like Figure 2 It is shown that the support piles include steel bar support piles and glass fiber reinforced support piles; the glass fiber reinforced support piles are constructed at the position that coincides with the position of the later municipal jacking pipe channel; The size of the steel support pile is 1000mm@1700mm, the main reinforcement in the steel cage skeleton is 18 C25 threaded steel bars, the spiral stirrups are A8@150, and the strengthening stirrups are C25@2000.

[0021] At present, glass fiber support piles are commonly used in existing shield construction processes. They are a kind of reinforcing material made of glass fiber, which is often used to increase the strength and toughness of concrete structures. They are made of high-strength glass fiber bundles after surface treatment and coating. They have many unique advantages: (1) Light weight and high strength. The weight is only 1 / 4 of the weight of steel bars of the same specification, but the tensile strength is about twice the load of steel bars of the same specification. The labor intensity of workers is greatly reduced, and the transportation cost is also reduced. (2) Strong corrosion resistance. The base materials used are all durable materials, formed by composite technology, with a service life of up to 100 years, and can be used as long-term support materials. (3) Cutability. Avoid damage to the cutting head and do not delay excavation. Anti-static and non-conductive, no sparks will be generated during cutting.

[0022] 3) During the main construction phase of the loop, a structural cavity is reserved in the main structure of the loop to facilitate the later passage of the municipal jacking pipe; 3.1) Use conventional technology to construct the underground loop channel, and strictly control the elevation and thickness of the top plate of the underground loop channel, which determines the bottom elevation of the reserved structural cavity; 3.2) Construct an endless wall loop cavity (underground loop cavity 4) in the reserved structural cavity (the construction structure is shown in Figure 3), and reserve the underground loop cavity by adding hidden beams and hidden columns; The wallless loop cavity 4 includes a top plate 17, a bottom plate and a side wall 10; the front and rear ends of the wallless loop cavity are wallless; and the side wall is provided with a hidden column 3. The top plate and the bottom plate of the underground loop cavity are 500mm thick, and the side wall is 500mm thick; the bottom of the side wall is a 500×1500mm frame beam.

[0023] A fully enclosed waterproof structure 8 is applied in the underground loop cavity; the waterproof structure is an SBS polyester tire modified asphalt type II waterproof membrane and a felt waterproof protective layer; A waterproof protective layer 9 is also provided on the bottom plate of the underground loop cavity; the waterproof protective layer has a thickness of 70 mm and is made of C20 fine stone concrete with a layer of A6@200×200 steel mesh.

[0024] The loop cavity structure serves as a direct passage on the municipal jacking path. The inner wall, top and bottom of the cavity are designed with a fully covered waterproof structure 8, and a waterproof protective layer 9 is set on the bottom plate of the underground loop cavity. The municipal jacking unit is jointly constructed with the municipal jacking unit to construct the bottom of the pipe to stabilize the pipe concrete 11. Together, they work to prevent water seepage in the loop structure caused by water seepage in the pipe joints.

[0025] 4) During the municipal pipe jacking construction phase, when the pipe jacking construction reaches the support pile position, the fiberglass reinforced support pile is removed and construction continues. Normal pipe jacking construction is carried out on the municipal rainwater pipe jacking 1 and sewage pipe jacking 2 from the rainwater pipe jacking well 14 and the sewage pipe jacking well 13 respectively. When the pipe jacking is 30m away from the fiberglass support pile reinforcement 7, additional measurements are taken, and measurements are taken at least once every 300mm of advancement. When the fiberglass support pile 7 is found in the tool pipe, a jackhammer is used to chisel out the support pile reinforcement and concrete, and the tool pipe is slowly pushed out of the support pile range.

[0026] The method of breaking the fiberglass reinforcement pile is as follows: (1) Use a pneumatic pick to remove the concrete wrapped around the reinforcement from top to bottom or from the side. (2) Within the breaking range, drive 2 to 4 steel chisels symmetrically at the same angle along the upper and lower horizontal planes of the fiberglass reinforcement pile, and use a sledgehammer to hit the concrete symmetrically at the same time to cut off the concrete. (3) For the fiberglass reinforcement skeleton that has not been completely cut off, use manual and machine tools to cut it off.

[0027] 5) After the municipal pipe jacking construction is completed, the pipe jacking plugging construction is carried out, and the reserved loop cavity is plugged with 12 brick walls, such as Figure 4 Show; Figure 5-6The final rainwater jacking pipe and the cross-sectional view of the rainwater jacking pipe are shown; after the construction of the urban underground space loop and municipal jacking pipe projects is completed in sequence, the roadbed, pavement and auxiliary projects of the ground 16 road project will be constructed. On the premise of meeting their respective functional requirements and structural safety, the three major unit projects will be completed and inspected and put into practical use. At this point, the urban underground loop, municipal pipelines, and ground roads have completed the system closed loop and are put into operation simultaneously.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for comprehensive utilization of underground space by co-constructing municipal pipe jacking and underground loop, characterized in that: The method includes the following steps: 1) design stage; 2) support engineering construction stage; glass fiber reinforced support piles are used to construct the locations where the support piles coincide with the locations of the later municipal jacking pipe passages; 3) main loop construction stage; a structural cavity is reserved in the main loop structure to facilitate the later passage of the municipal jacking pipes; 4) municipal jacking pipe construction stage; when the jacking pipe construction reaches the support piles, the glass fiber reinforced support piles are removed and construction continues.

2. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 1 is characterized in that: The specific steps of step 2) are: constructing support piles, the support piles include steel support piles and glass fiber reinforced support piles; the glass fiber reinforced support piles are used at the locations that coincide with the positions of the later municipal jacking pipe channels; the sizes of the steel support piles and glass fiber reinforced support piles are 1000mm@1700mm, the main reinforcement of the steel support piles is 18 C25 threaded steel bars, the spiral stirrups are A8@150, and the reinforcing stirrups are C25@2000.

3. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 2 is characterized in that: High-pressure rotary jet piles are constructed between adjacent supporting piles; the diameter of the high-pressure rotary jet piles is ≥800mm, and they are constructed using the double-tube method with cement slurry as the medium.

4. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 1 is characterized in that: The specific steps of step 3) are: construct a structural cavity above the underground loop passage of the loop main structure; construct an endless wall loop cavity in the structural cavity for the municipal top pipe to pass through; the endless wall loop cavity includes a top plate, a bottom plate and side walls; and concealed columns are arranged in the side walls.

5. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 4 is characterized in that: The thickness of the top and bottom plates of the loop cavity without end walls is 500mm, and the thickness of the side walls is 500mm; the bottom of the side walls is a 500×1500mm frame beam.

6. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 4 is characterized in that: A fully enclosed waterproof structure is constructed in the cavity of the endless wall loop; the waterproof structure includes SBS polyester tire modified asphalt type II waterproof membrane and a felt waterproof protective layer; a waterproof protective layer is arranged on the bottom plate of the cavity of the endless wall loop; the waterproof protective layer has a thickness of 70mm and adopts C20 fine stone concrete with a layer of A6@200×200 steel mesh.

7. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 1 is characterized in that: The method for breaking the fiberglass reinforcement support pile in step 4) is as follows: (1) using a pneumatic pick to remove the concrete wrapped around the reinforcement from top to bottom or from the side; (2) within the breaking range, 2 to 4 steel chisels are driven symmetrically at the same angle along the upper and lower horizontal planes of the fiberglass reinforcement support pile, and the concrete is cut off by hitting symmetrically with a sledgehammer at the same time; (3) for the fiberglass reinforcement skeleton that is not completely cut off, it is cut off by manual labor and machinery.

8. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 7 is characterized in that: Pipe-stabilizing concrete is set at the bottom of the jacking pipe.

9. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 7, characterized in that: After the jacking construction is completed, the cavity is sealed; brick walls are used to seal the underground loop cavity to ensure that there is no gap between the brick wall and the municipal jacking pipe section; then mortar is applied on the brick wall, and a waterproof and polystyrene board protective layer is applied.

10. The method for comprehensive utilization of underground space by co-constructing municipal jacking pipes and underground loops according to claim 1, characterized in that: The municipal jacking pipes include rainwater jacking pipes and sewage jacking pipes.

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