River channel berm excavation construction method under well protection condition in confined space

Abstract

The application discloses a kind of riverway berm excavation construction methods under the condition of pipe well protection in confined space, belong to riverway berm construction method field.Method includes: to the inside wall of inverted siphon is supported and protected;The local of the side of original berm far from inverted siphon is enclosed and removed;Inverted siphon is close to the side of original berm and sets a row of first protective stake;Two rows of second protective stake are set in the riverway of the outside of original berm to form cofferdam;The soil between inverted siphon and first protective stake is grouted and reinforced, sandbag is filled in the area between two rows of second protective stake and two rows of second protective stake are drawn and fixed;First protective stake is removed;The water in the area close to the inside of original berm of cofferdam is pumped dry;Original berm is excavated and constructed as berm.Through the method of the application, berm excavation construction can be carried out under the condition of pipe well close to river shoreline, limited space, maintaining normal use of pipe well and other limited space conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of river channel apron construction method, and particularly relates to a river channel apron excavation construction method under the protection condition of a pipe well in a limited space. BACKGROUND

[0002] The existing river channel apron mainly has a gravity type retaining wall apron, a cantilever type reinforced concrete retaining wall apron and a bored pile veneer apron. The first two mainly adopt the construction method of slope excavation after cofferdam water pumping, and the latter adopts pile foundation construction, then cofferdam water pumping and finally veneer treatment.

[0003] The gravity type retaining wall apron and the cantilever type reinforced concrete retaining wall apron need slope excavation, and the working face requirement is large, and if the river bank is buried with pipelines or other structures, the construction is limited; the bored pile veneer apron construction involves pile foundation access, which is not only high in cost but also has the problem of finished product protection of onshore pipe well and structure, and moreover, under the condition of limited space, large pile foundation cannot enter.

[0004] Therefore, it is urgent to provide a new method for apron excavation construction under the condition of limited space, such as close distance between pipe well and river bank line, limited space, normal use of pipe well and the like. SUMMARY

[0005] The present application aims to overcome the defects in the prior art and provide a river channel apron excavation construction method under the protection condition of a pipe well in a limited space.

[0006] The specific technical scheme adopted by the present application is as follows:

[0007] The present application provides a river channel apron excavation construction method under the protection condition of a pipe well in a limited space, and specifically as follows:

[0008] S1: The inner side wall of the inverted siphon to be protected in the construction site is internally supported and protected;

[0009] S2: The original apron far from the inverted siphon to be protected is partially excavated for enclosure to open the construction working face;

[0010] S3: A row of first protection piles is arranged on the side of the inverted siphon to be protected close to the original apron; two rows of second protection piles are arranged in the river channel outside the original apron to form a cofferdam, and the two rows of second protection piles have a spacing therebetween;

[0011] S4: The soil between the inverted siphon to be protected and the first protection piles is grouted and reinforced, the area surrounded by the two rows of second protection piles is filled with sandbags, and the two rows of second protection piles are tied and fixed;

[0012] S5: the first protection pile is removed to cut off the original apron located in the to-be-excavated soil and the to-be-protected soil located in the inverted siphon; and the water body near the inner side region of the cofferdam is pumped dry;

[0013] S6: based on the site environment after the treatment of steps S1-S5, the apron excavation construction is performed on the original apron.

[0014] Preferably, in the step S1, the inner support is set by square timber.

[0015] Preferably, in the step S2, the enclosure includes river channel Larsen steel sheet pile, fill and TRD method pile.

[0016] Preferably, in the step S3, the first protection pile and the second protection pile are both pine piles, and each row of protection piles can be connected to the existing enclosure facilities integrally.

[0017] Preferably, in the step S3, the distance between the first protection pile and the to-be-protected inverted siphon is 1.5 m.

[0018] Preferably, in the step S3, the distance between the two rows of second protection piles is 1.2 m.

[0019] Preferably, in the step S4, the two rows of second protection piles are fixed by using the steel wire rope in a "two-separation and one-pulling" mode.

[0020] Preferably, in the step S5, the following method can also be used:

[0021] The water body near the inner side region of the cofferdam is pumped dry; during the earthwork excavation, the horizontal support is set layer by layer by using the first protection pile and the adjacent enclosure facilities, and then the horizontal support is removed layer by layer during the apron construction.

[0022] Further, the horizontal support is square timber or steel pipe, one end of which is fixed to the first protection pile, and the other end of which is fixed to the adjacent enclosure facilities; and a layer of horizontal support is arranged every 2 m in the vertical direction.

[0023] Preferably, in the step S6, after the apron construction is completed, the inverted siphon needs to be protected during the backfilling of the earthwork, and the earthwork transport vehicle should not roll over the inverted siphon and the soil body near the inverted siphon.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The application solves the problem of berm excavation construction under the condition of pipe well protection in a limited space, and has two benefits: first, compared with cast-in-place pile construction, the cost is obviously saved. The pile foundation needs to be filled with earth to build a road or even occupy urban roads for construction, which leads to further cost increase; second, compared with traditional slope excavation construction, the finished product protection effect is outstanding. The inverted siphon needs to be protected, and the slope excavation will form a steep slope, which will inevitably cause great deformation of the slope and damage the inverted siphon in operation. The application can effectively avoid this situation. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a flow chart of the construction method;

[0027] Figure 2 is a schematic diagram of the present situation in the embodiment;

[0028] Figure 3 is a schematic diagram of the first step in the embodiment;

[0029] Figure 4 is a schematic diagram of the second step in the embodiment;

[0030] Figure 5 is a schematic diagram of the third step in the embodiment;

[0031] Figure 6 is a schematic diagram of the fourth step in the embodiment;

[0032] Figure 7 is a schematic diagram of the fifth step in the embodiment;

[0033] Figure 8 is a schematic diagram of the sixth step in the embodiment;

[0034] Figure 9 is a schematic diagram of the preferred step of adding horizontal support outside the pine pile in the embodiment. DETAILED DESCRIPTION

[0035] The application will be further described and explained in conjunction with the drawings and specific embodiments. The technical features of each embodiment in the application can be combined accordingly without conflict.

[0036] EMBODIMENT

[0037] As shown in Figure 1 , the application provides a river berm excavation construction method under the condition of pipe well protection in a limited space. Through the method of the application, berm excavation construction can be carried out under the limited space conditions that the pipe well is close to the river shoreline, the space is limited, and the pipe well needs to be maintained for normal use. The original site situation of the embodiment is as shown in Figure 2As shown, the right end of the original barge sill has a bridge, and the left end is provided with protection facilities along the river channel, which include a basement retaining wall, a retaining pile, a TRD, a river channel Larsen steel sheet pile, and the like.

[0038] The following will be described with reference to the drawings, taking the site as an example, using the construction method of the present application to reconstruct the original barge sill, and the steps are as follows:

[0039] S1: The inner side wall of the inverted siphon to be protected in the construction site is internally supported and protected.

[0040] As shown in the embodiment, first, the inner side wall of the inverted siphon to be protected is internally supported with square wood and the like. Figure 3

[0041] S2: Partially excavate and open the working face. On the basis of step S1, the side of the original barge sill away from the inverted siphon to be protected is partially excavated and protected to open the construction working face.

[0042] As shown in the embodiment, due to limited space, this step mainly opens the construction working face of the barge sill. For example, part of the existing river channel Larsen steel sheet pile, backfill and TRD method pile and the like are removed. Figure 4

[0043] S3: Bank and cofferdam protection pile construction. On the basis of step S2, a row of first protection piles is set near the side of the inverted siphon to be protected close to the original barge sill; two rows of second protection piles are set in the river channel outside the original barge sill to form a cofferdam, and the two rows of second protection piles have a spacing therebetween.

[0044] As shown in the embodiment, a row of pine piles is set at a distance of 1.5 meters from the inverted siphon, and two rows of pine piles are set in the river channel outside the barge sill to be built at a distance of 1.2 meters. Each row of pine piles can be connected to the existing protection facilities to form an integral whole, for example: one end of the first protection pile is connected to the bridge, and the other end is connected to the TRD; one end of the second protection pile is connected to the bridge, and the other end is connected to the retaining pile. Figure 5

[0045] S4: Inverted siphon soil grouting and reinforcement, cofferdam construction. On the basis of step S3, the soil between the inverted siphon to be protected and the first protection pile is grouted and reinforced, sandbags are filled in the area surrounded by the two rows of second protection piles, and the two rows of second protection piles are tied and fixed.

[0046] As shown in the embodiment, first, the inner side wall of the inverted siphon to be protected is internally supported with square wood and the like. Figure 6 ​​​As shown, in this embodiment, the soil between the inverted siphon and the pine piles is reinforced by grouting. Simultaneously, sandbags are filled between the two rows of pine piles of the cofferdam, and the pine piles on both sides are connected by steel wire ropes in a "two-everywhere-one" manner. Here, "two-everywhere-one" means that in each row of pine piles, every two pine piles, the third pine pile is connected and tightened to the opposite row of pine piles using steel wire ropes.

[0047] S5: Remove the pine piles near the inverted siphon and pump out the water inside the cofferdam. Based on step S4, remove the first protective pile to cut off the excavated soil where the original retaining wall is located and the soil that needs to be protected where the inverted siphon is located; pump out the water in the area of ​​the cofferdam close to the inner side of the original retaining wall.

[0048] like Figure 7 As shown, in this embodiment, pine piles near the inverted siphon are removed, artificially severing the soil to be excavated from the soil to be protected. The idea behind this step is to remove the pine piles outside the inverted siphon to separate the soil to be excavated from the soil to be protected. Using this method solves the problem of space constraints preventing pile foundation construction or the extremely high cost of forced implementation, thus saving costs.

[0049] However, besides this method, the pine piles can also be left in place, with horizontal supports erected on the outside. These horizontal supports can be square timber or steel pipes. During earthwork excavation, horizontal supports are installed layer by layer, with a layer every 2 meters vertically. These supports are then removed layer by layer during the final revetment construction. Figure 9 As shown. If this method is adopted, the disadvantage of limited space can be transformed into an advantage. The surrounding structures of the limited space are used as fulcrums for the internal slope support arrangement, which solves the problem of damage to the finished product caused by slope excavation, that is, protects the finished manhole.

[0050] S6: Based on the site environment after steps S1 to S5, excavate and construct the existing retaining wall, such as... Figure 8 It is important to note that when backfilling the soil behind the wall after the revetment construction is completed, care should be taken to protect the inverted siphon. Soil transport vehicles must not run over the inverted siphon or the soil in its vicinity.

[0051] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A method for riverway berm excavation construction under the condition of well protection in a confined space, characterized in that, Specifically as follows: S1: the inner side wall of the inverted siphon to be protected in the construction site is supported and protected; S2: the original apron away from the side of the inverted siphon to be protected is partially excavated to open the construction working surface; S3: a row of first protection piles is arranged on the side of the inverted siphon to be protected close to the original apron; two rows of second protection piles are arranged in the river channel outside the original apron to form a cofferdam, and the two rows of second protection piles have a spacing therebetween; S4: the soil between the inverted siphon to be protected and the first protection piles is grouted and reinforced, and sandbags are filled in the area surrounded by the two rows of second protection piles and the two rows of second protection piles are tied and fixed; S5: the first protection piles are removed to cut off the soil to be excavated where the original apron is located and the soil to be protected where the inverted siphon is located; the water in the area close to the inner side of the original apron of the cofferdam is pumped out; S6: based on the site environment treated by steps S1-S5, the apron excavation construction of the original apron is carried out. In the step S3, the distance between the first protection piles and the inverted siphon to be protected is 1.5 m, and the distance between the two rows of second protection piles is 1.2 m.

2. The method according to claim 1, wherein the method is characterized by, In the step S1, the inner support is supported by square wood.

3. The method according to claim 1, wherein the method is characterized by, In the step S2, the enclosure includes river Larson steel sheet piles, backfill and TRD method piles.

4. The method according to claim 1, wherein the method is characterized by, In the step S3, the first protection piles and the second protection piles are both pine piles, and each row of protection piles can be connected to the existing enclosure facilities integrally.

5. The method according to claim 1, wherein the method is characterized by, In the step S4, the two rows of second protection piles are tied and fixed by using steel wire ropes in a "two-to-one" manner.

6. The method according to claim 1, wherein the method is characterized by, In the step S5, the following method can also be used: The water in the area close to the inner side of the original apron of the cofferdam is pumped out; during earthwork excavation, horizontal supports are gradually erected layer by layer by using the first protection piles and the adjacent enclosure facilities, and then the horizontal supports are gradually removed layer by layer during apron construction.

7. The method according to claim 6, wherein the method is characterized by, The horizontal supports are square wood or steel pipes, one end of which is fixed to the first protection piles, and the other end of which is fixed to the adjacent enclosure facilities; a layer of horizontal supports is arranged every 2 m in the vertical direction.

8. The method according to claim 1, wherein the method is characterized by, In the step S6, after the apron construction is completed, the inverted siphon needs to be protected during backfilling of the wall back earthwork, and earthwork transport vehicles must not roll over the inverted siphon and the soil near the inverted siphon.

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