Construction structure for preventing dado of working well from falling and suddenly sinking

Abstract

The utility model belongs to the field of municipal engineering, and provides a construction structure for preventing a working well protection wall from falling and suddenly sinking, which comprises a foundation pit protection wall and a steel pipe pile, the steel pipe pile is pre-buried in the foundation pit protection wall, and the bottom end of the steel pipe pile extends below the bottom end of a foundation pit. In the construction structure, before the retaining wall is constructed, a certain number of steel pipe piles are piled in the retaining wall in advance, and the steel pipe piles are piled into a rock-soil body below the bottom of a working well foundation pit by a certain depth. By means of the vertical supporting effect of the steel pipe piles, the pipe jacking working well protection wall can be effectively prevented from falling and sinking suddenly due to shear damage of the fore shaft disc or damage of a foundation below the fore shaft disc, and the safety risk in the pipe jacking working well foundation pit construction process is remarkably reduced. For each section of retaining wall, the steel pipe pile at the section of retaining wall is exposed after excavation of a foundation pit soil body is completed, at the moment, a steel clamping plate is welded to the surface of the exposed steel pipe pile, and the shear capacity between the steel pipe pile and the retaining wall can be enhanced. C30 fine aggregate concrete is adopted for conducting core grouting on the steel pipe pile, and the vertical bearing capacity of the steel pipe pile can be enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to municipal works field, concretely relates to a construction structure for preventing the work well protection wall from falling and suddenly sinking. BACKGROUND

[0002] In order to solve the damage to urban buildings, underground pipelines and the like in pipeline burying construction, the application of pipe jacking method, a non-excavation engineering technology, is also more and more common. Pipe jacking construction pushes a pipe or a tunneling machine from a work well in the direction of the soil layer until it is pushed out from a receiving well. Pipe jacking construction first excavates a work well, and there are many types of support structures for the work well, and one of the most common types is cast-in-place reinforced concrete reverse construction method, which digs downward while supporting the soil body (not needed when the soil quality is good) with temporary support measures, binds steel bars after reaching a certain layer height, and forms a well wall by pouring reinforced concrete or using a hanging net to spray concrete, and is constructed by hanging and reverse construction from top to bottom in segments, i.e. the method of "short segment excavation and masonry". According to the soil quality, the length of the excavation segment is 50-100 cm.

[0003] In order to prevent the reinforced concrete protection wall from sinking due to its own weight, a lock disc is usually applied at the first section of the protection wall, the lock disc is a reinforced concrete plate overhanging at the top end of the first section of the protection wall, the steel bars of the lock disc are bound at the same time as the steel bars of the protection wall, and then the concrete is integrally poured. The main function of the lock disc is to balance the self-weight of the reinforced concrete protection wall, and the principle is that the self-weights of the reinforced concrete protection wall and the lock disc are balanced with the ground reaction force provided by the soil body below the lock disc, so as to achieve the purpose of preventing the reinforced concrete protection wall from sinking.

[0004] For an ultra-deep work well, the reinforced concrete protection wall also needs to be applied to the bottom, and the deeper the work well, the greater the self-weight of the reinforced concrete protection wall, but the ground reaction force provided by the soil body cannot be increased indefinitely, and the greater the self-weight of the reinforced concrete protection wall, the greater the shear force between the lock disc and the first section of the protection wall. Therefore, for an ultra-deep work well, the reinforced concrete protection wall may sink and suddenly sink due to shear failure of the lock disc or ground failure below the lock disc. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiencies in the prior art, the utility model provides a construction structure for preventing the work well protection wall from falling and suddenly sinking, which can solve the above problems.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: a construction structure for preventing the work well protection wall from falling and suddenly sinking, comprising a foundation pit protection wall and a plurality of steel pipe piles, the steel pipe piles are pre-buried in the foundation pit protection wall, and the bottom ends of the steel pipe piles extend below the bottom end of the foundation pit.

[0007] Preferably, the plurality of steel pipe piles are uniformly and circumferentially spaced.

[0008] As preferred, the adjacent steel pipe piles are spaced 2m apart.

[0009] As preferred, the steel pipe piles are located at the middle position in the foundation pit wall.

[0010] As preferred, the bottom elevation of the foundation pit is higher than the bottom elevation of the steel pipe pile by more than 2m.

[0011] As preferred, the steel pipe pile is filled with C30 fine stone concrete.

[0012] As preferred, the steel pipe pile is provided with a clamping plate on the side wall.

[0013] As preferred, the clamping plate is a steel clamping plate.

[0014] As preferred, the clamping plate is welded and fixed to the steel pipe pile.

[0015] As preferred, the clamping plate is horizontally arranged.

[0016] Compared with the prior art, the construction structure for preventing the work well wall from falling and suddenly sinking has the following beneficial effects:

[0017] 1. The construction structure for preventing the work well wall from falling and suddenly sinking can effectively prevent the work well wall from falling and suddenly sinking due to the shear failure of the lock disc or the damage of the foundation below the lock disc, and significantly reduces the safety risk in the process of the work well foundation pit construction.

[0018] 2. The construction structure for preventing the work well wall from falling and suddenly sinking can enhance the shear resistance between the steel pipe pile and the work well wall by welding two steel clamping plates on the exposed surface of the steel pipe pile after the excavation of the foundation pit soil body.

[0019] 3. The construction structure for preventing the work well wall from falling and suddenly sinking can enhance the vertical bearing capacity of the steel pipe pile by filling the steel pipe pile with C30 fine stone concrete. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a top view of the construction structure for preventing the work well wall from falling and suddenly sinking according to the embodiment of the present application;

[0021] Figure 2 FIG. 2 is a sectional view of the construction structure for preventing the work well wall from falling and suddenly sinking according to the embodiment of the present application;

[0022] Figure 3Part of the construction structure of the embodiment of the utility model provides a kind of construction structure's partial section structure schematic diagram for preventing the work well wall subsidence.

[0023] In the drawings, the component list represented by each sign is as follows:

[0024] 1, foundation pit wall;2, steel pipe pile;3, clamping plate;4, top pipe;5, soil layer;6, rock-soil body. DETAILED DESCRIPTION

[0025] The utility model will be further explained in detail in connection with specific embodiment, so that the person skilled in the art more clearly understands the utility model.

[0026] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, it can also be detachably connected, and it can also be integrally formed structure.For the ordinary skilled in the art, the specific meaning of such terms in this patent can be understood according to the specific situation.

[0027] Example 1

[0028] For the work well of super-deep top pipe reverse construction method, the embodiment provides a kind of construction structure for preventing work well wall subsidence, including foundation pit wall 1, multiple steel pipe piles 2, steel pipe pile 2 is embedded in foundation pit wall 1, and the bottom end of steel pipe pile 2 extends to the bottom end of foundation pit below.

[0029] For example, referring to Figures 1-3 , foundation pit wall 1 is vertically arranged, nine steel pipe piles 2 are embedded in foundation pit wall 1, and the bottom end of steel pipe pile 2 extends to the rock-soil body 6 below the bottom end of foundation pit.

[0030] Based on the above structure, before the construction of foundation pit wall 1, steel pipe pile 2 is set in foundation pit wall 1 in advance, and the vertical support of steel pipe pile 2 can effectively prevent the subsidence of the wall caused by the shear failure of the lock disc or the damage of the foundation below the lock disc, and significantly reduce the safety risk in the construction process of the top pipe work well foundation pit.

[0031] In the embodiment, multiple steel pipe piles 2 are uniformly and spacedly arranged along the circumference.

[0032] For example, referring to Figure 1 , nine steel pipe piles 2 are uniformly and spacedly arranged along the circumference. Adjacent steel pipe piles 2 are spaced 2m apart. In this way, the support of steel pipe pile 2 to foundation pit wall 1 is more uniform and stable. It is worth noting that steel pipe pile 2 should avoid the position of top pipe 4 to avoid interference between steel pipe pile 2 and top pipe 4.

[0033] Steel pipe pile 2 is located in the middle position of foundation pit wall 1.

[0034] For example, referring to Figure 1 The distance between the steel pipe pile 2 and the outer ring and the inner ring of the foundation pit retaining wall 1 is equal, which can improve the stability of the steel pipe pile 2 and the foundation pit retaining wall 1.

[0035] The bottom end elevation of the foundation pit is higher than the bottom end elevation of the steel pipe pile 2 by 2m or more.

[0036] For example, referring to Figure 2 The bottom end of the foundation pit is the bottom end of the foundation pit retaining wall 1, and the bottom end elevation of the foundation pit retaining wall 1 is higher than the bottom end elevation of the steel pipe pile 2 by 2m. The deeper the bottom end of the steel pipe pile 2, the more stable the steel pipe pile 2.

[0037] The steel pipe pile 2 is filled with C30 fine stone concrete. The use of C30 fine stone concrete for core filling of the steel pipe pile 2 can enhance the vertical bearing capacity of the steel pipe pile 2.

[0038] In order to improve the shear capacity of the steel pipe pile 2 and the foundation pit retaining wall 1, the side wall of the steel pipe pile 2 is provided with a clamping plate 3.

[0039] For example, referring to Figure 3 The side wall of the steel pipe pile 2 is provided with two rows of clamping plates 3, each row including a plurality of clamping plates 3 uniformly spaced vertically, and the clamping plates 3 can be horizontally arranged. The two rows of clamping plates 3 are symmetrical, and the clamping plates 3 can improve the shear capacity of the steel pipe pile 2 and the foundation pit retaining wall 1.

[0040] Among them, the clamping plate 3 can be a steel clamping plate. The clamping plate 3 is welded and fixed with the steel pipe pile 2. The welding structure is stable and has high strength.

[0041] In summary, the construction structure for preventing the collapse of the working well retaining wall provided in the embodiment can include the following steps:

[0042] Step 1, before the construction of the foundation pit retaining wall 1, a circle of steel pipe piles 2 is uniformly set along the center axis of the retaining wall, the center distance between adjacent steel pipe piles 2 is 2m, and the steel pipe piles 2 are driven into the rock-soil body 6 below the bottom of the foundation pit of the working well by a certain depth;

[0043] Step 2, after the steel pipe pile 2 is driven in, C30 fine stone concrete is used to core fill the steel pipe pile 2 to enhance the vertical bearing capacity of the steel pipe pile 2;

[0044] Step 3, level the site, excavate the foundation pit of the first section of the working well retaining wall, bind the first section of the retaining wall and the lock disc reinforcement, and pour the concrete of the first section of the retaining wall and the lock disc;

[0045] Step 4, after the strength value of the concrete of the first section of the retaining wall and the lock disc reaches more than 60% of the design strength, continue to excavate the foundation pit of the second section of the retaining wall, bind the reinforcement of the second section of the retaining wall, weld two steel clamping plates 3 on the exposed steel pipe pile in the excavated foundation pit at the middle position to enhance the shear capacity of the steel pipe pile 2 and the foundation pit retaining wall 1, and then pour the concrete of the second section of the retaining wall;

[0046] Step 5, after the second section of the retaining wall strength value reaches more than 60% of the design strength, continue to excavate the third section of the retaining wall foundation pit, bind the third section of the retaining wall reinforcement, weld two steel clamping plates 3 on the middle position of the exposed steel pipe pile in the excavated foundation pit, enhance the shear capacity of the steel pipe pile 2 and the foundation pit retaining wall 1, and then pour the third section of the retaining wall concrete;

[0047] Step 6, repeat the above process until the working well foundation pit reaches the designed depth, then perform pipe jacking operation, and backfill the working well foundation pit after pipe jacking is completed.

[0048] In the utility model, the mechanisms, components and parts not described in the specific structure are all existing structures in the prior art. They can be directly purchased from the market.

[0049] In the description of the utility model, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, a specific orientation structure and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0050] The above is only a preferred embodiment of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A construction structure for preventing collapse of a working well lining, characterized by, The foundation pit retaining wall (1) comprises a plurality of steel pipe piles (2) embedded in the foundation pit retaining wall (1), and the bottom end of the steel pipe pile (2) extends below the bottom end of the foundation pit.

2. The construction structure for preventing the collapse of the wall of a working well according to claim 1, wherein A plurality of steel pipe piles (2) are uniformly and circumferentially spaced.

3. The construction structure for preventing the collapse of the wall of the working well according to claim 1, wherein The adjacent steel pipe piles (2) are spaced 2m apart.

4. The construction structure for preventing the collapse of the wall of a working well according to claim 1, wherein The steel pipe pile (2) is located at the middle position in the foundation pit retaining wall (1).

5. The construction structure for preventing the collapse of the wall of a working well according to claim 1, wherein The bottom end elevation of the foundation pit is higher than the bottom end elevation of the steel pipe pile (2) by more than 2m.

6. The construction structure for preventing the collapse of the wall of a working well according to claim 1, wherein The steel pipe pile (2) is filled with C30 fine stone concrete.

7. The construction structure for preventing the collapse of the wall of a working well according to claim 1, wherein The side wall of the steel pipe pile (2) is provided with a clamping plate (3).

8. The construction structure for preventing the collapse of the wall of the working well according to claim 7, wherein The clamping plate (3) is a steel clamping plate.

9. The construction structure for preventing the collapse of the wall of a working well according to claim 8, wherein The clamping plate (3) is welded and fixed with the steel pipe pile (2).

10. The construction structure for preventing the collapse of the wall of a working well according to claim 7, wherein The clamping plate (3) is horizontally arranged.

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