CN108590681A - Shield well reserving hole quick blocking system and its construction method - Google Patents

Abstract

The present invention relates to a kind of shield well reserving hole quick blocking system and its construction methods, prefabricated plugging plate is set above shield well reserving hole, prefabricated plugging plate both side plate end is erected on the agent structure top plate ring beam of shield well, monolithic reinforced concrete structure layer is set above prefabricated plugging plate, it is laid with waterproof layer above monolithic reinforced concrete structure layer, foundation pit backfill layer is backfilled with above waterproof layer.The present invention blocks hole by prefabricated plugging plate after shield well completion mission, and closure is laid with waterproof layer, cast-in-place concrete layer after the completion, and the work such as foundation pit backfill have the characteristics that closure is quick, engineering intersection is small, save the duration, is safe.

Description

Rapid plugging system and construction method of reserved holes in shield wells

technical field

The invention relates to the technical field of tunnel engineering, in particular to a fast sealing system for reserved holes in a shield well and a construction method thereof.

Background technique

At present, the construction of rail transit projects in major cities in China is gradually increasing. Citizens' needs for subways are becoming more and more urgent. The construction period and safety pressure of subways are increasing. Blocking technology has cross operations with mechanical and electrical equipment units such as tunnel track laying, and the safety is relatively poor.

Contents of the invention

The object of the present invention is to provide a fast sealing system and construction method for reserved holes in shield wells. On the hole, laying waterproof layer, cast-in-place concrete layer, etc., the hole can be quickly closed, and the tunnel space is not occupied, and the electromechanical unit is not affected by the blockage.

The technical scheme adopted in the present invention is:

The rapid plugging system of reserved holes in shield wells is characterized by:

A prefabricated blocking slab is installed above the reserved hole in the shield well, and the plate ends on both sides of the prefabricated blocking slab are erected on the roof ring beam of the main structure of the shield well. A waterproof layer is laid above the concrete structure layer, and the foundation pit backfill layer is backfilled above the waterproof layer.

The prefabricated blocking boards are strip-shaped and arranged parallel and side by side above the reserved holes of the shield well.

The plate ends on both sides of the prefabricated blocking slab are laid on the flush opening set on the inner side of the roof ring beam of the main structure, and the surface of the flush opening is provided with a cement mortar leveling layer.

Neoprene latex cement is installed between the side end face of the prefabricated blocking plate and the ring beam of the roof of the main structure.

Water-expandable water-stop strips are arranged between the bottom surface of the end of the prefabricated blocking plate and the flush surface of the ring beam of the roof of the main structure.

The cast-in-place reinforced concrete structure layer is constructed above the prefabricated sealing slab, and the two sides cover the joints between the prefabricated sealing slab and the ring beam of the roof of the main structure.

The top surface of the main structure roof ring beam below the end of the cast-in-place reinforced concrete structure layer is provided with a water-expandable water-stop strip.

The construction method of the fast plugging system for reserved holes in shield wells as described is characterized in that:

Include the following steps:

Step 1: Determine the size of the shield well, including the size of the hole reserved for the shield;

Step 2: Construction of the side walls of the main structure, construction of the roof ring beam of the main structure of the roof hole;

Step 3: Shield construction;

Step 4: The prefabricated blocking board adopts C50, the width of each piece is less than 1.5 meters, and it is prefabricated in a factory;

Step 5: After the shield construction is completed, locate the installation position of the prefabricated blocking plate;

Step 6: The roof ring beam of the main structure is leveled with 1:1 cement mortar to form a cement mortar leveling layer, the strength grade is ≥ M15, and water-swellable water-stop strips are installed;

Step 7: The prefabricated blocking board is hoisted and installed in blocks; during the prefabrication process of the prefabricated blocking board, four φ25 hooks need to be pre-embedded at both ends to facilitate hoisting during on-site construction;

Step 8: Neoprene latex cement is filled between the roof ring beam of the main structure and the prefabricated sealing plate;

Step 9: Install the water-expandable water-swelling strip on the top surface of the ring beam of the main structure roof, and cast in-situ concrete above the prefabricated blocking slab, using C35 concrete, and the laying range is 2000 meters wider than the prefabricated slab or 500mm to the inner edge of the enclosure structure. The steel mesh is laid in double layers of φ12@150×150;

Step 10: After the construction of the cast-in-place reinforced concrete structure layer is completed, a waterproof layer can be laid. The waterproof layer is composed of a paint waterproof layer + a 70mm thick C20 fine stone concrete protective layer;

Step 11: Backfill to the design elevation as required, and the reserved holes are plugged.

The present invention has the following advantages:

In the present invention, when the main body is constructed, the prefabricated slab is reserved for construction, the blocking slab is prefabricated in advance, the cast-in-place concrete layer and the waterproof layer are laid, and the equipment and materials used for sealing the reserved holes of the shield are all conventional materials, which are convenient for construction. . And according to the force and equipment needs, different specifications of prefabricated panels can be processed to meet the plugging technology of reserved holes of various specifications. After the prefabricated slab is laid, the mechanical and electrical construction in the cave can be carried out, which reduces the crossover of the construction period, saves the construction period, and is safe and reliable.

Description of drawings

Fig. 1 is the plane layout diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Figure 3 is an enlarged view of the plate end of the prefabricated blocking plate.

In the figure, 1. Envelope structure, 2. Side wall of main structure, 3. Roof beam of main structure, 4. Backfill layer of foundation pit, 5. Prefabricated sealing plate, 6. Cast-in-place reinforced concrete structure layer, 7. Cement Mortar leveling layer, 8. Water-swellable water-stop strip, 9. Neoprene latex cement filling, 10. Waterproof layer.

Detailed ways

The present invention will be described in detail below in combination with specific embodiments.

The invention relates to a fast sealing system for reserved holes in shield wells. During the construction process, the hole sealing board can be prefabricated in advance, and after the shield construction is completed, it can be directly erected on the reserved holes, laying a waterproof layer, The cast-in-place concrete layer realizes rapid closure of the hole without occupying the tunnel space, and the electromechanical unit is not affected by the closure.

The specific structure is:

A prefabricated blocking plate 5 is arranged above the reserved holes of the shield well, and the prefabricated blocking plates 5 are in the shape of strips, and are arranged parallel and side by side above the reserved holes of the shield well. The prefabricated blocking plate 5 is divided into blocks reasonably according to the size of the reserved shield well, and the end block can be set according to the needs. Generally, the width of the blocking plate is controlled to be less than 1.5 meters, and the plate width is generally evenly distributed. Engineering prefabrication is completed during the construction of the shield, which is a prefabricated reinforced concrete structure. The plate ends on both sides of the prefabricated blocking plate 5 are placed on the roof ring beam 3 of the main structure of the shield well, and the ends are placed on the flush opening set on the inner side of the roof ring beam 3 of the main structure. In order to meet the stress requirements, the surface of the mouth is provided with a cement mortar leveling layer 7. A cast-in-place reinforced concrete structure layer 6 is set above the prefabricated blocking slab 5 as a waterproof strengthening layer, using C35 concrete with a thickness of 300mm, and laying upper and lower double-layer steel mesh sheets φ12@150×150. When the prefabricated blocking slab 5 cannot bear all the overlying water and soil pressure, the cast-in-place reinforced concrete structure layer 6 can be designed as a combined force-bearing system, increasing the thickness of the cast-in-place layer and the arrangement of steel bars. A waterproof layer 10 is laid on the top of the cast-in-situ reinforced concrete structure layer 6 , and the foundation pit backfill layer 4 is backfilled above the waterproof layer 10 .

Neoprene latex cement filling 9 with a thickness of 50-100 mm is arranged between the side end surface of the prefabricated blocking plate 5 and the ring beam 3 of the roof of the main structure. A water-swellable water-stop strip 8 is arranged between the bottom surface of the end of the prefabricated blocking plate 5 and the flush surface of the top plate ring beam 3 of the main structure.

The cast-in-place reinforced concrete structure layer 6 is applied above the prefabricated blocking slab 5, and the two sides cover the joints between the prefabricated blocking slab 5 and the ring beam 3 of the roof of the main structure. The top surface of the main structure roof ring beam 3 below the end of the cast-in-place reinforced concrete structure layer 6 is provided with a water-expandable water-swelling strip 8 .

The construction method of above-mentioned structure comprises the steps:

1) Determine the size of the shield well, including the size of the hole reserved for the shield.

2) Construction of the main structure side wall 2, construction of the roof hole main structure roof ring beam 3.

3) Shield construction.

4) The prefabricated blocking plate 5 is made of C50, the width of each piece is less than 1.5 meters, and it is prefabricated in a factory.

5) After the shield construction is completed, the installation position of the prefabricated blocking plate 5 is positioned.

6) The roof ring beam 3 of the main structure is evenly leveled with 1:1 cement mortar to form a cement mortar leveling layer 7 with a strength grade ≥ M15, and water-swellable water-stop strips 8 are installed.

7) The prefabricated blocking plate is hoisted and installed in 5 pieces.

During the prefabrication process of prefabricated blocking plate 5, four φ25 hooks need to be pre-embedded at both ends to facilitate hoisting during on-site construction.

8) Neoprene latex cement is filled between the roof ring beam 3 of the main structure and the prefabricated blocking plate 5 .

9) Install the water-expandable water-swelling water-stop strip 8 on the top surface of the ring beam 3 of the main structure roof, and cast in-situ concrete above the prefabricated blocking slab 5, using C35 concrete, and the laying range is 2,000 meters wider than the prefabricated slab or within the enclosure structure 1 The edge is 500mm, and the steel mesh is laid in double layers of φ12@150×150.

10) After the construction of the cast-in-place reinforced concrete structure layer 6 is completed, the waterproof layer 10 can be laid. The waterproof layer 10 is composed of a paint waterproof layer + a 70mm thick C20 fine stone concrete protective layer.

11) Backfill to the design elevation as required, and the reserved holes are plugged.

The content of the present invention is not limited to the examples listed, and any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is covered by the claims of the present invention.

Claims (8)

1. A rapid plugging system for reserved holes in shield wells, characterized by: Set the prefabricated blocking plate (5) above the reserved hole of the shield well, the plate ends on both sides of the prefabricated blocking plate (5) are set on the main structure roof ring beam (3) of the shield well, and the prefabricated blocking plate (5) A cast-in-place reinforced concrete structure layer (6) is arranged above, a waterproof layer (10) is laid above the cast-in-place reinforced concrete structure layer (6), and a foundation pit backfill layer (4) is backfilled above the waterproof layer (10). 2. The fast plugging system for reserved holes in shield wells according to claim 1, characterized in that: The prefabricated blocking plates (5) are in the shape of strips, and are arranged in parallel and juxtaposed above the reserved holes of the shield well. 3. The fast plugging system for reserved holes in shield wells according to claim 1, characterized in that: The plate ends on both sides of the prefabricated blocking plate (5) are placed on the flush opening provided on the inner side of the roof ring beam (3) of the main structure, and the surface of the flush opening is provided with a cement mortar leveling layer (7). 4. The fast plugging system for reserved holes in shield wells according to claim 3, characterized in that: Neoprene latex cement filling (9) is arranged between the side end surface of the prefabricated blocking plate (5) and the ring beam (3) of the roof of the main structure. 5. The fast plugging system for reserved holes in shield wells according to claim 3, characterized in that: A water-expandable water-stop strip (8) is arranged between the bottom surface of the end of the prefabricated blocking plate (5) and the flush surface of the roof ring beam (3) of the main structure. 6. The fast plugging system for reserved holes in shield wells according to claim 1, characterized in that: The cast-in-place reinforced concrete structure layer (6) is applied above the prefabricated blocking slab (5), and both sides cover the joints between the prefabricated blocking slab (5) and the ring beam (3) of the roof of the main structure. 7. The fast plugging system for reserved holes in shield wells according to claim 1, characterized in that: The top surface of the main structure roof ring beam (3) below the end of the cast-in-place reinforced concrete structure layer (6) is provided with a water-expandable water-stop strip (8). 8. The construction method of the reserved hole fast plugging system of shield well as claimed in claim 1, is characterized in that: Include the following steps: Step 1: Determine the size of the shield well, including the size of the hole reserved for the shield; Step 2: Construction of the side wall of the main structure (2), and construction of the roof ring beam of the main structure of the roof hole (3); Step 3: Shield construction; Step 4: The prefabricated blocking board (5) adopts C50, and the width of each piece is less than 1.5 meters, and it is prefabricated in a factory; Step 5: After the shield construction is completed, the installation position of the prefabricated blocking plate (5) is positioned; Step 6: The roof ring beam of the main structure (3) is leveled with 1:1 cement mortar to form a cement mortar leveling layer (7), the strength grade is ≥ M15, and the water-swellable water-stop strip (8) is installed; Step 7: The prefabricated blocking plate (5) is hoisted and installed in blocks; during the prefabrication process of the prefabricated blocking plate (5), 4 φ25 hooks need to be pre-embedded at both ends to facilitate hoisting during on-site construction; Step 8: Neoprene latex cement is filled between the main structure roof ring beam (3) and the prefabricated blocking plate (5); Step 9: Install the water-swellable water-swelling strip (8) on the top surface of the ring beam (3) of the main structure roof, and cast in-situ concrete above the prefabricated blocking slab (5), using C35 concrete, and the laying range is 2000 meters wider than that of the prefabricated slab Or to the inner edge of the enclosure structure (1) 500mm, the reinforcement mesh shall be laid in double layers of φ12@150×150; Step 10: After the construction of the cast-in-place reinforced concrete structure layer (6) is completed, the waterproof layer (10) can be laid, and the waterproof layer (10) is composed of a paint waterproof layer + a 70mm thick C20 fine stone concrete protective layer; Step 11: Backfill to the design elevation as required, and the reserved holes are plugged.