Construction Technology for Forming Deep Guide Holes in the Reconstruction of the Waterproof System on the Water-facing Side of the Inverse Construction Method

Abstract

The present invention provides a construction process for forming deep guide holes in the reconstruction of the waterproof system on the water-facing side by the inverse construction method. By means of high-pressure perfusion of waterproof materials into the deep guide holes, the problem of water seepage in underground buildings due to the failure of the original waterproof layer seal is solved. The main steps include drilling for the first time to place the casing and the grouting pipe, and fixing the lower casing; drilling for the second time, pouring in the waterproof materials, removing the upper casing, backfilling the drilling hole, and restoring the building surface layer.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof construction, and particularly relates to a construction process for forming deep guide holes in the reconstruction of the waterproof system on the water-facing side of the inverse construction method. Background Art

[0002] In existing underground engineering construction, since the underground structure is below the ground surface, a waterproof layer needs to be set below the structural layer and on the outer side surface of the structure to achieve the purpose of preventing water seepage in underground buildings such as underground garages and underground shopping malls; however, due to factors such as the quality of waterproof materials, the waterproof layer may have problems with the failure of the waterproof function, thereby causing the shortening of the service life of the building structure and even affecting the safety of the building structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction process for forming deep guide holes in the reconstruction of the waterproof system on the water-facing side of the inverse construction method. By means of high-pressure perfusion of waterproof materials through deep guide holes, the problem of water seepage caused by the failure of the original waterproof layer in underground buildings is solved.

[0004] The purpose of the present invention is achieved as follows: A construction process for forming deep guide holes in the reconstruction of the waterproof system on the water-facing side of the inverse construction method, characterized in that it at least includes the following steps:

[0005] S1. Drill a hole from the building ground surface layer down to the upper surface of the structural raft layer, and drill a set depth below the upper surface of the structural raft layer to form a groove;

[0006] S2. Place a casing with a grouting pipe installed inside into the drilled hole. The lower end side and bottom of the casing are hollowed out and placed in the groove, and the lower end of the grouting pipe is fixed in the grouting port at the bottom of the casing;

[0007] S3. Fill the lower end of the casing with a fluid sealant so that the lower end of the casing is sealed and fixed on the structural raft layer;

[0008] S4. The drill bit passes downward through the grouting pipe, the grouting port and the structural raft layer until it reaches the waterproof layer;

[0009] S5. After the drill bit is taken out from the grouting pipe, use the grouting pipe to pour the waterproof material into the gap between the upper surface of the waterproof layer and the lower surface of the structural raft layer and the defects of the structural raft layer to form a waterproof reconstruction layer.

[0010] Further, the casing includes a separable upper casing and a lower casing. After the waterproof reconstruction layer is formed, the upper casing is taken out from the drilled hole, the lower casing is left at the bottom of the drilled hole, and the drilled hole is backfilled to restore the building surface layer.

[0011] Further, the drilling depth in steps S1 and S4 is constructed according to the building drawings.

[0012] Further, in step S1, when the drill bit drills down to the upper surface of the structural raft slab layer, use a steel bar scanner to detect whether there are steel bars in the structural raft slab layer below the drill hole. If steel bars are detected, backfill the drill hole at this place and re-construct at another position.

[0013] Further, an annular groove is formed in the lower casing. The bottom and the outer groove wall of the annular groove are hollowed out, and a grouting pipe is connected to the inner groove wall of the annular groove.

[0014] Further, the height of the inner groove wall of the annular groove is lower than that of the outer groove wall, and the filling height of the fluid sealant covers at least the inner groove wall.

[0015] Further, the ground includes at least a building floor surface layer, a backfill soil layer, a structural raft slab layer, a waterproof layer, and a cushion layer from top to bottom.

[0016] Further, the upper casing and the lower casing are in a plug-and-play fit, and an elastic socket is provided at the lower end of the upper casing and is tightly fitted on the lower casing.

[0017] The prominent and beneficial technical effects of the present invention compared with the prior art are: This process can quickly repair the damaged and water-seeping underground waterproof layer of existing buildings, is convenient for construction, has little damage to the existing structure, and is technically safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic flow chart of the process in the embodiment of the present invention;

[0019] Figure 2 is a structural diagram of the casing and the grouting pipe in the drill hole in the embodiment of the present invention;

[0020] Figure 3 is a three-dimensional structural diagram of the lower casing in the embodiment of the present invention;

[0021] Figure 4 is a sectional view of the lower casing in the embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the lower end structure of the upper casing in the embodiment of the present invention.

[0023] Reference numerals: 1, building floor surface layer; 2, backfill soil layer; 3, structural raft slab layer; 3a, groove; 4, plain concrete layer; 5, waterproof layer; 6, cushion layer; 7, primary drill hole; 8, casing; 8a, upper casing; 8a1, elastic socket; 8b, lower casing; 8b1, annular groove; 8b2, grouting port; 9, grouting pipe; 10, fluid sealant; 11, secondary drill hole; 12, waterproof reconstruction layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further details the specific embodiments of the present invention with reference to the drawings.

[0025] A construction technology for forming a deep guide hole in the reconstruction of the waterproof system on the water-facing side by the top-down method, combined with Figure 1 and Figure 2 , this technology at least includes the following steps:

[0026] S1. Drill down from the building floor surface layer 1 to the upper surface of the structural raft slab layer 3, and drill a set depth below the upper surface of the structural raft slab layer 3 to form a groove 3a; (The groove 3a here is used to install the lower end of the casing 8, and the lower end of the casing 8 is fixed on the raft slab with the fluid sealant 10 to facilitate subsequent operations)

[0027] S2. Place the casing 8 with the grouting pipe 9 installed inside into the drill hole. The lower end of the casing 8 is hollowed out laterally and at the bottom and placed in the groove. The lower end of the grouting pipe 9 is fixed in the grouting port 8b2 at the bottom of the casing 8; (The hollow structure of the casing 8 facilitates the fluid sealant 10 to contact the structural raft slab layer 3 through the hollow holes to fix the lower end of the casing 8)

[0028] S3. Fill the lower end of the casing 8 with the fluid sealant 10 so that the lower end of the casing 8 is hermetically fixed on the structural raft slab layer 3;

[0029] S4. The drill bit passes downward through the grouting pipe 9, through the grouting port 8b2 and the structural raft slab layer 3 until it reaches the waterproof layer 5 to complete the secondary drilling 11 operation;

[0030] S5. After the drill bit is removed from the grouting pipe 9, use the grouting pipe 9 to pour the waterproof material onto the waterproof layer 5 to form a waterproof reconstruction layer 12. (When injecting the waterproof material, high-pressure injection is used to ensure that the material is fully injected)

[0031] It should be noted that the primary drilling 7 and the secondary drilling 11 are constructed according to the building drawings to facilitate accurately positioning the material layer corresponding to the drilling position.

[0032] Among them, in the primary drilling 7 step, when the drill bit drills down to the upper surface of the structural raft slab layer 3, use a steel bar scanner to detect whether there is steel bar in the structural raft slab layer 3 below the drill hole. If steel bar is detected, backfill the drill hole at this place and re-construct at another position.

[0033] Specifically, Figure 2 , preferably, the casing 8 includes a separable upper casing 8a and a lower casing 8b. After the waterproof reconstruction layer 12 is formed, the upper casing 8a is taken out from the drill hole, the lower casing 8b is left in the bottom of the drill hole, the drill hole is backfilled, and the building surface layer is restored. The grouting pipe 9 is left inside for subsequent waterproof maintenance. Such a setting can facilitate the recycling of the upper casing 8a and reduce the maintenance cost. The upper casing 8a and the lower casing 8b can be in an interference fit in the form of plugging and unplugging. Since the lower casing 8b is fixed on the raft slab, the upper casing 8a is separated from the lower casing 8b when it is pulled out upward; see Figure 5, an elastic socket 8a1 is provided at the lower end of the upper casing. The diameter of the elastic socket 8a1 is smaller than that of the upper casing and is provided with an axial notch strip, facilitating a certain deformation ability of the elastic socket 8a1; a conical surface is provided at the lower end of the elastic socket 8a1 to facilitate insertion into the opening of the lower casing 8b below, thereby connecting and mating using elastic force.

[0034] Combined with Figure 3 and Figure 4 , the specific structure of the lower casing 8b is as follows. An annular groove 8b1 is formed inside the lower casing 8b. The bottom and outer groove wall of the annular groove 8b1 are hollowed out. The inner groove wall of the annular groove 8b1 is sleeved on the grouting pipe 9 to form a grouting port 8b2.

[0035] Specifically, see Figure 4 , the height of the inner groove wall of the annular groove 8b1 is lower than that of the outer groove wall, and the filling height of the fluid sealant 10 covers at least the inner groove wall.

[0036] The underground structure template referred to in the process of this embodiment mainly includes a building floor surface layer 1, a backfill soil layer 2 (with an unlimited thickness), a structural raft slab layer 3, a plain concrete layer 4 (which may not be available according to design requirements), a waterproof layer 5, and a cushion layer 6.

[0037] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A construction process for forming deep guide holes in the reconstruction of the waterproof system on the water-facing side by the top-down method, characterized in that: At least include the following steps: S1. Drill a hole downward from the building floor surface layer to the upper surface of the structural raft slab layer, and drill a set depth below the upper surface of the structural raft slab layer to form a groove. S2. Place a casing with a grouting pipe installed inside into the drilled hole. The lower end side and bottom of the casing are hollowed out and placed in the groove, and the lower end of the grouting pipe is fixed in the grouting port at the bottom of the casing. S3. Fill the lower end of the casing with a fluid sealant to seal and fix the lower end of the casing on the structural raft slab layer. S4. The drill bit passes downward through the grouting pipe, through the grouting port and the structural raft slab layer until it reaches the waterproof layer. S5. After the drill bit is removed from the grouting pipe, use the grouting pipe to pour waterproof material into the gap between the upper surface of the waterproof layer and the lower surface of the structural raft slab layer and the defects of the structural raft slab layer to form a waterproof reconstruction layer. S6. After the waterproof reconstruction layer is formed, backfill the drilled hole, restore the building surface layer, and leave the grouting pipe inside for subsequent waterproof maintenance.

2. The reverse construction method for forming a deep guide hole in the waterproof system reconstruction of the water-facing surface according to claim 1, characterized in that: The casing includes a separable upper casing and a lower casing. After the waterproof reconstruction layer is formed, the upper casing is removed from the drilled hole, the lower casing is left at the bottom of the drilled hole, and the drilled hole is backfilled to restore the building surface layer.

3. The reverse construction method for forming a deep guide hole in the waterproof system reconstruction of the water-facing surface according to claim 1, characterized in that: The drilling depths in steps S1 and S4 are constructed according to the building drawings.

4. The reverse construction method for forming a deep guide hole in the waterproof system reconstruction of the water-facing surface according to claim 1, characterized in that: In step S1, when the drill bit drills to the upper surface of the structural raft slab layer, use a steel bar scanner to detect whether there is steel bar in the structural raft slab layer below the drilled hole. If steel bar is detected, backfill the drilled hole at this place and re-construct at another position.

5. The construction process for forming a deep guide hole in reconstructing the waterproof system on the water-facing side by the top-down method according to claim 2, characterized in that: An annular groove is formed inside the lower casing. The bottom and outer groove wall of the annular groove are hollowed out, and the inner groove wall of the annular groove is connected to the grouting pipe.

6. The reverse construction method for forming deep guide holes in the waterproof system reconstruction of the water-facing surface according to claim 5, characterized in that: The height of the inner groove wall of the annular groove is lower than that of the outer groove wall, and the filling height of the fluid sealant covers at least the inner groove wall.

7. The reverse construction method for forming a deep guide hole in the waterproof system reconstruction on the water-facing side according to claim 1, characterized in that: The ground includes at least a building floor surface layer, a backfill soil layer, a structural raft slab layer, a waterproof layer, and a cushion layer from top to bottom.

8. The construction process for forming deep guide holes in reconstructing the waterproof system on the water-facing side by the top-down method according to claim 2, characterized in that: The upper casing and the lower casing are in a plug-and-play fit, and an elastic socket that fits tightly on the lower casing is provided at the lower end of the upper casing.

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