Underground side wall waterproof enclosure structure and construction method

Abstract

The invention relates to the technical field of underground structure engineering, and provides an underground side wall waterproof enclosure structure which comprises two steel sheet piles serving as an enclosure structure, a cushion layer is arranged at the bottom ends of the sides, close to each other, of the two steel sheet piles, masonry walls are built at the two ends of the top side of the cushion layer, and underground structure side walls are poured on the sides, close to each other, of the masonry walls at the two ends; the masonry wall serves as a buffer layer between the steel sheet piles and the underground structure side wall, an outer waterproof layer used for preventing water is arranged on the side, close to the masonry wall, of the underground structure side wall, and the underground structure side wall is connected with a steel sheet water stop belt through a composite construction joint. A masonry wall is built between a steel sheet pile and an underground structure, an outer waterproof layer of an underground structure side wall of the underground structure is constructed to the masonry wall, and the masonry wall serves as a buffer layer between the steel sheet pile and the underground structure side wall and between the steel sheet pile and the outer waterproof layer. Therefore, the purpose of reducing damage to the side wall and the outer waterproof layer of the underground structure in the pulling-out process of the steel sheet pile is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of underground structure engineering, and in particular to an underground side wall waterproof enclosure structure and a construction method. Background Art

[0002] Steel sheet piles are widely used as retaining structures in underground structures. As the steel sheet pile retaining structure is pulled out after the foundation pit construction is completed, the steel sheet pulling process will disturb the stratum and underground structure. The disturbance during the steel sheet pile pulling process will have a destructive effect on the waterproof layer of the side wall of the underground structure.

[0003] The disturbance during the steel sheet pile extraction process will damage the waterproof layer of the underground structure side wall, which directly affects the durability and service life of the underground structure. How to ensure that the steel sheet pile extraction process does not damage the waterproof layer of the underground structure side wall has become the key to ensuring the durability and normal service life of the underground structure. Therefore, it is necessary to invent an underground side wall waterproof enclosure structure and a construction method. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an underground side wall waterproof enclosure structure and a construction method. The scheme builds a brick wall between the steel sheet piles and the underground structure, and constructs the waterproof layer of the side wall of the underground structure onto the brick wall, thereby reducing the damage to the waterproof structure of the side wall of the underground structure during the withdrawal of the steel sheet piles to meet the normal use requirements of the underground structure; it can effectively reduce the impact on the waterproof structure of the side wall of the underground structure during the withdrawal of the steel sheet piles, has a simple structure, is easy to construct, and has good practicality.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an underground side wall waterproof enclosure structure, comprising: two steel sheet piles as an enclosure structure, a cushion layer is arranged at the bottom end of the adjacent side of the two steel sheet piles, masonry walls are built at both ends of the top side of the cushion layer, and underground structure side walls are cast on the adjacent sides of the masonry walls at both ends, the masonry walls serve as a buffer layer between the steel sheet piles and the underground structure side walls, an external waterproof layer for waterproofing is arranged on the adjacent side of the underground structure side wall and the masonry wall, the underground structure side wall is connected with a steel plate waterstop by a composite construction joint, so as to ensure the waterproof performance of the waterproof enclosure structure through the steel plate waterstop, and a certain space is left between the steel sheet pile and the masonry wall to facilitate the convenient removal of the steel sheet piles while reducing damage to the structure of the masonry wall.

[0006] Preferably, the composite construction joint comprises an annular construction joint arranged inside the side wall of the underground structure, the steel plate waterstop is connected to the annular construction joint, and horizontal construction joints are arranged at both ends of the annular construction joint.

[0007] Preferably, an underground structure bottom plate is provided on the bottom side of the underground structure side wall, and an underground structure top plate is provided on the top side of the underground structure side wall.

[0008] Preferably, a backfill layer for capping is cast on the top side of the top plate of the underground structure.

[0009] Preferably, the height of the masonry wall is 100 mm higher than the height of the side wall of the underground structure.

[0010] A construction method for an underground side wall waterproof enclosure structure comprises the following steps: Step 1: Dig out the foundation pit, insert steel sheet piles into the foundation pit, and over-excavate the section of the foundation pit appropriately; Step 2: Cast the side wall of the underground structure in the foundation pit, leave annular construction joints and horizontal construction joints on the side wall of the underground structure, and install steel plate waterstops at the annular construction joints; Step 3: construct a masonry wall on the outside of the underground structure side wall, and construct an external waterproof layer on the masonry wall and cast the structure side wall; Step 4: Backfill the top side of the underground structure, then pull out the steel sheet piles and backfill the gaps where the steel sheet piles were originally inserted.

[0011] Preferably, the masonry wall in step three is located in the space reserved between the steel sheet piles and the side wall of the underground structure, so that when the steel sheet piles are subsequently pulled out, the masonry wall can be used to protect the side wall of the underground structure to prevent the side wall of the underground structure from being damaged.

[0012] Preferably, in step three, a space for installing an external waterproof layer is reserved between the side wall of the underground structure and the masonry wall.

[0013] The present invention provides an underground side wall waterproof enclosure structure and a construction method, which have the following beneficial effects: 1. The present invention utilizes masonry walls built between steel sheet piles and the underground structure, and constructs the outer waterproof layer of the underground structure side wall of the underground structure onto the masonry wall, so that the masonry wall serves as a buffer layer between the steel sheet piles and the underground structure side wall and the outer waterproof layer, thereby achieving the purpose of reducing the damage to the underground structure side wall and the outer waterproof layer during the steel sheet pile extraction process.

[0014] 2. The present invention effectively reduces the damage to the waterproof structure of the side wall of the underground structure caused by the steel sheet pile extraction process, has a simple structure, is easy to construct, has strong anti-deformation ability, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Among them, 1. Steel sheet piles; 2. Masonry walls; 3. Underground structure top plate; 4. External waterproof layer; 5. Steel plate waterstop; 6. Horizontal construction joints; 7. Underground structure side walls; 8. Underground structure bottom plate; 9. Cushion layer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example: As one aspect of the present invention, please refer to the attached Figure 1 A waterproof enclosure structure for underground side walls, comprising: two steel sheet piles 1 as enclosure structures, a cushion layer 9 is arranged at the bottom ends of the adjacent sides of the two steel sheet piles 1, masonry walls 2 are built at both ends of the top side of the cushion layer 9, and an underground structure side wall 7 is cast on the adjacent sides of the masonry walls 2 at both ends, the masonry wall 2 is built as a buffer layer between the steel sheet piles 1 and the underground structure side wall 7, the height of the masonry wall 2 is 100 mm higher than the height of the underground structure side wall 7, an outer waterproof layer 4 for waterproofing is arranged on the adjacent sides of the underground structure side wall 7 and the masonry wall 2, and an outer waterproof layer 4 for waterproofing is arranged on the underground structure side The steel plate waterstop 5 is connected to the annular construction joint inside the wall 7, and horizontal construction joints 6 are arranged at both ends of the annular construction joint to ensure the waterproof performance of the waterproof enclosure structure through the steel plate waterstop 5. A certain space is left between the steel sheet pile 1 and the masonry wall 2 to facilitate the convenient removal of the steel sheet pile 1 while reducing damage to the structure of the masonry wall 2. The bottom side of the underground structure side wall 7 is provided with an underground structure bottom plate 8, and the top side of the underground structure side wall 7 is provided with an underground structure top plate 3. The top side of the underground structure top plate 3 is cast with a backfill layer for capping.

[0019] Based on the above-mentioned underground side wall waterproof enclosure structure, as another aspect of the present invention, a construction method of an underground side wall waterproof enclosure structure comprises the following steps: Step 1: dig out a foundation pit, insert steel sheet piles 1 into the foundation pit, and appropriately over-excavate the cross section of the foundation pit; Step 2: Cast the underground structure side wall 7 in the foundation pit, leave an annular construction joint and a horizontal construction joint 6 on the underground structure side wall 7, and install a steel plate water stop 5 at the annular construction joint; Step 3: construct a masonry wall 2 on the outside of the underground structure side wall 7, and construct an external waterproof layer 4 and a cast structure side wall on the masonry wall 2. The masonry wall 2 is located in the space reserved between the steel sheet pile 1 and the underground structure side wall 7, so that when the steel sheet pile 1 is pulled out later, the masonry wall 2 can be used to protect the underground structure side wall 7 to prevent the underground structure side wall 7 from being damaged, and the space between the underground structure side wall 7 and the masonry wall 2 for installing the external waterproof layer 4 is reserved; Step 4: backfill the top side of the underground structure, then pull out the steel sheet piles 1, and backfill the gaps where the steel sheet piles 1 were originally inserted.

[0020] This construction method utilizes building a masonry wall 2 between the steel sheet piles 1 and the underground structure, constructing the outer waterproof layer 4 of the underground structure side wall 7 of the underground structure onto the masonry wall 2, so that the masonry wall 2 serves as a buffer layer between the steel sheet piles 1 and the underground structure side wall 7 and the outer waterproof layer 4, thereby achieving the purpose of reducing the damage to the underground structure side wall 7 and the outer waterproof layer 4 during the extraction of the steel sheet piles 1.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An underground side wall waterproof enclosure structure, characterized in that: include: Two steel sheet piles (1) are used as a retaining structure. A cushion layer (9) is provided at the bottom ends of the adjacent sides of the two steel sheet piles (1). Masonry walls (2) are built at both ends of the top side of the cushion layer (9). The adjacent sides of the masonry walls (2) at both ends are cast with underground structure side walls (7). The masonry walls (2) are built as a buffer layer between the steel sheet piles (1) and the underground structure side walls (7). The adjacent sides of the underground structure side walls (7) and the masonry walls (2) are provided with an external waterproof layer (4) for waterproofing. The underground structure side walls (7) are connected with steel plate waterstops (5) by means of composite construction joints so as to ensure the waterproof performance of the waterproof retaining structure through the steel plate waterstops (5). A certain space is left between the steel sheet piles (1) and the masonry walls (2) so as to facilitate the convenient extraction of the steel sheet piles (1) while reducing damage to the structure of the masonry walls (2).

2. The underground side wall waterproof enclosure structure according to claim 1, characterized in that: The composite construction joint comprises an annular construction joint arranged inside the underground structure side wall (7), the steel plate water stop (5) is connected to the annular construction joint, and horizontal construction joints (6) are arranged at both ends of the annular construction joint.

3. The underground side wall waterproof enclosure structure according to claim 1, characterized in that: An underground structure bottom plate (8) is provided on the bottom side of the underground structure side wall (7), and an underground structure top plate (3) is provided on the top side of the underground structure side wall (7).

4. The underground side wall waterproof enclosure structure according to claim 3, characterized in that: A backfill layer for capping is cast on the top side of the underground structure top plate (3).

5. The underground side wall waterproof enclosure structure according to claim 1, characterized in that: The height of the masonry wall (2) is 100 mm higher than the height of the underground structure side wall (7).

6. A construction method for an underground side wall waterproof enclosure structure, using an underground side wall waterproof enclosure structure as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: dig a foundation pit, insert steel sheet piles (1) into the foundation pit, and appropriately over-excavate the cross section of the foundation pit; Step 2: Cast the underground structure side wall (7) in the foundation pit, leave an annular construction joint and a horizontal construction joint (6) on the underground structure side wall (7), and install a steel plate water stop (5) at the annular construction joint; Step 3: construct a masonry wall (2) on the outside of the underground structure side wall (7), and construct an external waterproof layer (4) and cast the structure side wall on the masonry wall (2); Step 4: backfill the top side of the underground structure, then pull out the steel sheet piles (1), and backfill the gaps where the steel sheet piles (1) were originally inserted.

7. The construction method of an underground side wall waterproof enclosure structure according to claim 6, characterized in that: In step 3, the masonry wall (2) is located in the space reserved between the steel sheet pile (1) and the underground structure side wall (7), so that when the steel sheet pile (1) is subsequently pulled out, the masonry wall (2) can be used to protect the underground structure side wall (7) to prevent the underground structure side wall (7) from being damaged.

8. The underground side wall waterproof enclosure structure and construction method according to claim 6, characterized in that: In step three, a space for installing the outer waterproof layer (4) is reserved between the underground structure side wall (7) and the masonry wall (2).

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