A suspended sinking vertical shaft construction process

Abstract

The present invention discloses a suspended sinking vertical shaft construction process, comprising the following steps: (A) excavating a starting section space and constructing a locking structure, assembling or pouring a bottom sealing blade foot; (B) injecting mud into the starting section space and installing a submersible excavator; (C) the submersible excavator starts working, and transports rock and soil to a mud purification device on the ground through mud circulation, and the bottom sealing blade foot and the shaft wall float on the mud by buoyancy; (D) assembling or pouring a new ring shaft wall, and installing a pressure pipe and a steel wire rope; (E) injecting water into the annular space of the pressure pipe and the shaft wall to sink the shaft wall; (F) taking out the submersible excavator, pouring bottom sealing concrete into the bottom of the shaft, and filling the space behind the wall with cement mortar for cementing; (G) pumping out mud and water, and removing the pressure pipe and the tensioning steel wire rope; (H) closing the hole of the bottom sealing blade foot, and injecting grouting water to seal the space between the bottom sealing blade foot and the bottom sealing concrete.

Description

Technical Field

[0001] The invention relates to the technical field of municipal construction, in particular to a suspended sinking vertical shaft forming process. Background Art

[0002] At present, most municipal deep shafts such as underground shaft garages and water collection wells are excavated manually. The construction of water-stop curtains in water-bearing strata is costly, difficult and time-consuming. The drilling method is used for construction, and the equipment is bulky, and the prefabricated shaft wall requires a large area of ​​site. When constructing large-diameter deep shafts, the suspended shaft wall sinking technology has a large suspension weight and is technically difficult. Summary of the invention

[0003] To this end, the technical problem to be solved by the present invention is to provide a suspended sinking vertical shaft completion process, in which the shaft wall floats and sinks while the submersible excavator is digging, and the submersible excavator can be taken out for maintenance during the floating and sinking process of the shaft wall, and the submersible excavator can also be recovered after the shaft wall sinks into place.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] 1. A suspended sinking vertical shaft construction process, characterized in that it comprises the following steps:

[0006] (A) excavating the starting section space (15), constructing the locking structure (13), assembling or casting the bottom sealing blade foot (2), constructing the bottom ring well wall (3) around the bottom sealing blade foot (2), and casting the bottom of the bottom ring well wall (3) and the bottom sealing blade foot (2) as a whole;

[0007] (B) inserting a mud agitator into the center of the bottom blade foot (2), injecting mud into the starting section space (15), and digging the installation space of the submersible excavator (1). After completion, taking out the mud agitator, installing the submersible excavator (1) in the starting section space (15) just below the middle hole of the bottom blade foot (2), and checking whether the submersible excavator (1) works normally, and installing a pressure pipe on the embedded flange (16) in the center of the bottom blade foot (2);

[0008] (C) The submersible excavator (1) starts working, and the excavated and crushed rock and soil are transported to the mud purification equipment on the ground through mud circulation. The excavation diameter of the submersible excavator (1) is larger than the diameter of the well wall (3), forming a space behind the wall (6). As the excavation depth increases, the bottom sealing blade foot (2), the pressure pipe and the well wall (3) float on the mud by buoyancy, and then a counterweight block is placed on the bottom sealing blade foot (2) for leveling;

[0009] (D) Assembling or casting a new ring of the well wall (3), connecting the pressure pipe (5), and the tensioning wire rope (4) between the pressure pipe (5) and the well wall (3);

[0010] (E) injecting water into the annular space between the pressure pipe (5) and the shaft wall (3) to cause the shaft wall (3) to sink by one section height, and continuing the next excavation cycle until the shaft wall (3) sinks to the designed depth;

[0011] (F) The submersible excavator (1) is lifted to the ground via the pressure pipe (5), and bottom seal concrete (18) is poured to the bottom of the well via the pressure pipe (5). After the bottom seal solidifies, cement mortar is filled into the space behind the wall (6) of the well wall (3) for cementing;

[0012] (G) gradually pumping out the mud in the pressure pipe (5) and the water between the pressure pipe (5) and the well wall (3), and removing the pressure pipe (5) and the tensioning wire rope (4);

[0013] (H) Closing the hole of the bottom sealing blade foot (2), installing the connecting steel bars between the bottom sealing blade foot (2) and the bottom sealing concrete (18), and injecting grout to seal water between the bottom sealing blade foot (2) and the bottom sealing concrete (18).

[0014] 2. The above-mentioned suspended sinking vertical shaft construction process is characterized in that, in step (A): when the starting section space (15) is excavated, the taper of the excavated soil layer is the same as the bottom blade foot (2), the surrounding iron guards of the bottom blade foot (2) are assembled, the steel cage is tied, the inner layer formwork is installed, and concrete is poured to form the bottom blade foot (2), and the steel cage of the bottom blade foot (2) is connected to the bottom ring of the shaft wall (3) steel bars to produce the bottom ring of the shaft wall (3).

[0015] 3. A suspended sinking vertical shaft construction process according to claim 1 is characterized in that the shaft wall (3) can be made of cast-in-place concrete, prefabricated reinforced concrete, or assembled from steel plates.

[0016] 4. The above-mentioned suspended sinking vertical shaft construction process is characterized in that in step (B): when the stratum is soil, silt and sand layer, the submersible excavator (1) is equipped with a stirring mud suction pump as an excavation tool; when the stratum is a pebble layer or a rock layer, the submersible excavator (1) is equipped with a groove milling machine and a mud pump for excavation.

[0017] 5. The above-mentioned suspended sinking vertical shaft construction process is characterized in that in step (D): when the submersible excavator (1) needs to be repaired and the excavation tool needs to be replaced, it is lifted to the ground through the pressure pipe (5); after the repair and replacement of the excavation tool are completed, it is lowered to the support beam of the bottom blade foot (2) through the pressure pipe (5).

[0018] 6. The above-mentioned suspended sinking vertical shaft construction process is characterized in that in step (D): a group of guide shoes (8) are installed at intervals of 3-5 sections in height in the wall back space (6) outside the shaft wall (3).

[0019] 7. The above-mentioned suspended sinking vertical shaft construction process is characterized in that, in step (H): a water collection pit (17) is constructed around the bottom of the bottom sealing blade foot (2).

[0020] The technical solution of the present invention achieves the following beneficial technical effects:

[0021] Since the construction site of municipal deep shafts is limited, a short construction period is required, and the requirements for settlement and noise are high, and the construction cost is sensitive. By adopting the mud wall protection method, the construction of water-stop curtains can be avoided, saving the cost and construction period of water-stop curtains. However, when using the drilling method, it is necessary to drill into the wellbore first, and then sink the prefabricated well wall (3) into the drilled wellbore, which requires a relatively large site. Therefore, the suspended sinking vertical shaft well-making process designed by the present invention can be used for excavation during the suspended sinking process of the well wall (3), which saves site and construction period compared to the drilling method, and simplifies the well wall (3) lifting system compared to the well wall (3) suspension sinking scheme.

[0022] During the construction of a large-diameter flooded caisson with a diameter of more than 10 meters, on the one hand, the weight of the well wall (3) in the mud often exceeds 1,000 tons, which puts a lot of pressure on the lifting system. If the lifting system is not used, the well wall (3) is directly located at the bottom of the well, and the well wall (3) is prone to deflection, causing the well wall (3) to sink unsmoothly, or even causing the well wall (3) to be scrapped. In municipal engineering projects with relatively dense personnel, the drilling method is used to drill first and then sink the well. After drilling, the wellbore is only protected by mud. Once collapse occurs, the surrounding settlement cannot be controlled. Therefore, the suspended sinking vertical shaft well construction process designed by the present invention can suspend and sink the well wall (3) during the excavation process, and the well wall (3) has a certain supporting effect on the surrounding soil layer during the excavation process.

[0023] During the process of excavation with the well wall (3) floating and sinking, the mechanical equipment under the liquid is not easy to maintain. When the excavation tools are damaged, the existing method is to have divers go down to the well for underwater repair. Moreover, after the well wall (3) sinks into place, the mechanical equipment is not easy to recover. Therefore, the suspended sinking vertical well construction process designed by the present invention can lift the mechanical equipment under the liquid to the ground through the pressure pipe (5) for maintenance and recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the space excavation and construction lock structure of the starting section in step A of the present invention;

[0025] Figure 2 Schematic diagram of the bottom sealing blade foot and the bottom ring well wall structure in step A of the present invention;

[0026] Figure 3 Schematic diagram of injecting slurry in step B of the present invention;

[0027] Figure 4 Schematic diagram of installing a submersible excavator in step B of the present invention;

[0028] Figure 5 Schematic diagram of the submersible excavator being lifted to the ground in step F of the present invention;

[0029] Figure 6 Schematic diagram of pouring bottom concrete in step F of the present invention;

[0030] Figure 7 Schematic diagram of pumping water and slurry and removing the pressure pipeline in step G of the present invention;

[0031] Figure 8 A schematic diagram of the structure after the pressure pipeline is removed in step G of the present invention;

[0032] Fig. 9 Schematic diagram of sealing the bottom blade foot hole and the water collection pit in step H of the present invention;

[0033] Fig.10 Schematic diagram of the structure inside the well during normal excavation in step E of the present invention.

[0034] The reference numerals in the figure are as follows: 1-submersible excavator; 2-bottom sealing blade foot; 3-well wall; 4-tensioning wire rope; 5-pressure pipe; 6-space behind the wall; 7-pipeline; 8-guide shoe; 9-water level; 10-water injection pipe; 11-mud level; 12-return slurry pipe; 13-locking structure; 14-submersible excavator fixing device; 15-starting section space; 16-embedded flange; 17-sump; 18-bottom sealing concrete. DETAILED DESCRIPTION

[0035] like Figure 1-10 As shown, the suspended sinking vertical shaft construction process of this embodiment includes the following steps:

[0036] A. Space construction of the starting section and installation of the bottom blade

[0037] like Figure 1As shown, firstly, an excavator is used to dig the starting section space (15) and the casting space of the locking structure (13), tie the locking structure (13) steel cage, support the formwork, cast the locking structure (13) concrete, complete the construction of the locking structure (13), and install the lifting equipment on the locking structure (13). Then, Figure 2 As shown, the bottom sealing blade foot (2) is cast by assembling or casting, and the bottom of the well wall (3) is tied with the bottom sealing blade foot (2) by steel bars and then cast together with the bottom sealing blade foot (2) to ensure waterproofing.

[0038] B. Installing a submersible excavator

[0039] like Figure 3 As shown, an excavator is used to dig an installation space for the submersible excavator (1) below the bottom sealing blade foot (2), and mud is injected into the starting section space (15) and the submersible excavator (1) installation space. The submersible excavator (1) is installed in the starting section space (15) facing the hole of the bottom sealing blade foot (2). Figure 4 As shown, it is detected whether the submersible excavator (1) is working normally.

[0040] C. Excavation and shaft suspension

[0041] like Fig.10 As shown, the submersible excavator (1) starts working, excavates rock and soil through a stirring mud suction device or a slot milling device, and transports the excavated rock and soil to the mud purification equipment on the ground through mud circulation. The mud purification equipment purifies the mud and then returns it to the wellbore. The rock and soil separated by the mud purification equipment is transported to the treatment site by vehicles. As the excavation depth increases, the bottom blade foot (2) and the well wall (3) float on the mud by their own buoyancy. Assemble or cast a new ring well wall (3), install a pressure pipe (5), and a tensioning wire rope (4) between the pressure pipe (5) and the well wall (3), and the pressure pipe (5) is connected to the through-hole flange (16) of the bottom blade foot (2). A certain amount of water is injected into the annular space between the pressure pipe (5) and the well wall (3), so that the well wall (3) sinks one section height. The sum of the weight of the water and the weight of the well wall (3) of one section height is equal to the weight of the mud discharged after sinking one section height. The next excavation cycle is continued until the well wall (3) sinks to the designed depth.

[0042] D. Preparation before well completion

[0043] like Figure 5 As shown, the submersible excavator (1) is lifted to the ground via the pressure pipe (5), and then Figure 6 As shown, the bottom sealing concrete (18) is poured to the bottom of the well through the pressure pipe (5), and finally as shown in FIG. Figure 7As shown, after the bottom seal solidifies, cement mortar is filled in the space (6) behind the well wall (3) to cement the well, and the mud in the pressure pipe (5) and the water between the pressure pipe (5) and the well wall (3) are gradually pumped out, and the pressure pipe (5) and the tensioning wire rope (4) are removed to form the following Figure 8 The hole of the bottom sealing blade foot (2) is sealed, and water is injected between the bottom sealing blade foot (2) and the bottom sealing concrete (18), and the two are connected as an anti-floating structure, and finally the permanent structure of the bottom of the well is constructed, such as Fig. 9 shown.

[0044] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the claims of this patent application.

Claims

1. A suspended sinking vertical shaft construction process, characterized in that: The steps include: (A) excavating the starting section space (15), constructing the locking structure (13), assembling or casting the bottom sealing blade foot (2), constructing the bottom ring of the well wall (3) around the bottom sealing blade foot (2), and casting the bottom of the bottom ring of the well wall (3) and the bottom sealing blade foot (2) as a whole; (B) inserting a mud agitator into the center of the bottom blade foot (2), injecting mud into the starting section space (15), and digging the installation space of the submersible excavator (1). After completion, taking out the mud agitator, installing the submersible excavator (1) in the starting section space (15) just below the middle hole of the bottom blade foot (2), and checking whether the submersible excavator (1) works normally, and installing a pressure pipe on the embedded flange (16) in the center of the bottom blade foot (2); (C) The submersible excavator (1) starts working, and the excavated and crushed rock and soil are transported to the mud purification equipment on the ground through mud circulation. The excavation diameter of the submersible excavator (1) is larger than the diameter of the well wall (3), forming a space behind the wall (6). As the excavation depth increases, the bottom sealing blade foot (2), the pressure pipe and the well wall (3) float on the mud by buoyancy, and then a counterweight block is placed on the bottom sealing blade foot (2) for leveling; (D) Assembling or casting a new ring of the well wall (3), connecting the pressure pipe (5), and connecting the tensioning wire rope (4) between the pressure pipe (5) and the well wall (3); (E) injecting water into the annular space between the pressure pipe (5) and the shaft wall (3) to cause the shaft wall (3) to sink by one section height, and continuing the next excavation cycle until the shaft wall (3) sinks to the designed depth; (F) The submersible excavator (1) is lifted to the ground via the pressure pipe (5), and bottom seal concrete (18) is poured to the bottom of the well via the pressure pipe (5). After the bottom seal concrete solidifies, cement mortar is filled in the space behind the wall (6) of the well wall (3) for cementing; (G) gradually pumping out the mud in the pressure pipe (5) and the water between the pressure pipe (5) and the well wall (3), and removing the pressure pipe (5) and the tensioning wire rope (4); (H) Closing the hole in the middle of the bottom sealing blade foot (2), installing the connecting steel bars between the bottom sealing blade foot (2) and the bottom sealing concrete (18), and injecting grout to seal water between the bottom sealing blade foot (2) and the bottom sealing concrete (18).

2. A suspended sinking vertical shaft construction process according to claim 1, characterized in that: In step (A): when the starting section space (15) is excavated, the taper of the excavated soil layer is the same as that of the bottom sealing blade foot (2), the surrounding iron guards of the bottom sealing blade foot (2) are assembled, the steel cage is tied, the inner layer formwork is installed, and concrete is poured to form the bottom sealing blade foot (2), and the steel cage of the bottom sealing blade foot (2) is connected to the steel bars of the bottom ring of the well wall (3), so as to manufacture the bottom ring of the well wall (3).

3. The suspended sinking vertical shaft construction process according to claim 1 is characterized in that: The well wall (3) is in the form of cast-in-place concrete, prefabricated reinforced concrete or steel plate assembly.

4. The suspended sinking vertical shaft construction process according to claim 1 is characterized in that: In step (C): when the stratum is soil, silt or sand, the submersible excavator (1) is equipped with a stirring mud suction device as an excavation tool; when the stratum is a pebble layer or a rock layer, the submersible excavator (1) is equipped with a groove milling device and a mud pump for excavation.

5. The suspended sinking vertical shaft construction process according to claim 1 is characterized in that: In step (D): when the submersible excavator (1) needs to be repaired and the excavation tool is replaced, it is lifted to the ground via the pressure pipe (5); after the repair and replacement of the excavation tool is completed, it is lowered to the support beam of the bottom blade foot (2) via the pressure pipe (5).

6. The suspended sinking vertical shaft construction process according to claim 1 is characterized in that: In step (D): a set of guide shoes (8) is installed at intervals of 3-5 sections in height in the wall rear space (6) outside the well wall (3).

7. The suspended sinking vertical shaft construction process according to claim 1 is characterized in that: In step (H): a water collection pit (17) is constructed around the bottom of the bottom sealing blade foot (2).

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