Bedrock fissure water rigid prevention and control foundation raft combined waterproof and drainage system and construction method

Abstract

The invention relates to a bed rock fissure water rigid prevention and control foundation raft combined waterproof and drainage system and a construction method. The construction method specifically comprises the following steps that firstly, foundation pit excavation and supporting construction are conducted; secondly, a light well point downcast pipe is arranged in the foundation pit in a driving mode; thirdly, the prefabricated anti-floating sump is constructed; 4, rigid waterproof cushion layer construction; fifthly, uplift pile treatment is conducted; and sixthly, a waterproof concrete bottom plate is constructed. The engineering cost is effectively reduced, the construction speed is increased, and good technical and economic benefits can be obtained when the method is applied to actual engineering.

Description

Technical Field

[0001] The present invention relates to a combined waterproof and drainage system and construction method for a rigid prevention and control of bedrock fissure water foundation raft, belonging to the field of civil engineering and applicable to the construction of the waterproof and drainage system of the foundation raft. Background Art

[0002] With the acceleration of the urbanization process, various large-scale buildings, high-rise buildings, and underground space projects such as subways and underground shopping malls have emerged continuously. As an important foundation form of these buildings, the foundation raft bears huge loads from the superstructure and evenly transfers them to the foundation soil. In areas with rich groundwater, the foundation raft is in a complex water environment for a long time, not only has to bear water pressure but also deal with the erosion of groundwater. Single waterproof or drainage measures are difficult to meet the engineering requirements.

[0003] Early foundation waterproofing mainly relied on single technologies such as roll waterproofing or coating waterproofing. In the face of complex geological conditions and long-term use, problems such as aging, cracking, and leakage at the lap joints of the waterproof layer are likely to occur. For example, in an environment with large temperature differences, the rolls of traditional roll waterproofing are prone to shrinkage and deformation, resulting in joint cracking and loss of waterproof effect. And simple drainage measures, such as blind ditch drainage, if the drainage is not smooth, the accumulated water will still cause harm to the foundation raft. To overcome these problems, the combined waterproof and drainage technology for the foundation raft has emerged. It integrates a variety of waterproof and drainage means, and through complementary advantages, forms a more reliable and efficient protection system to adapt to different geological conditions and engineering requirements, ensuring the safety and stability of the foundation raft during long-term use.

[0004] Conventional construction of the waterproof and drainage of the foundation raft has problems such as poor drainage effect, low construction efficiency, and easy seepage and leakage around the bottom slab in the later stage. Summary of the Invention

[0005] The purpose of the present invention is to provide a combined waterproof and drainage system and construction method for a rigid prevention and control of bedrock fissure water foundation raft to meet the requirements of structural construction in view of the problems in the construction of the combined waterproof and drainage system of the bedrock fissure water rigid prevention and control foundation raft.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solutions: The construction method of the combined waterproof and drainage system of the bedrock fissure water rigid prevention and control foundation raft specifically includes the following steps: Step 1: Carry out the construction of foundation pit excavation and support; Step 2: Drive light well point dewatering pipes in the foundation pit; Step 3. Construction of prefabricated anti-floating sump: Install the prefabricated anti-floating sump on the foundation pit soil. There are sump anchoring holes and water inlet holes on both sides of the prefabricated anti-floating sump, and fix the prefabricated anti-floating sump through the anti-floating anchor steel pipes; there are grouting holes on the anti-floating anchor steel pipes; after the prefabricated anti-floating sump is fixed, install a water pump and a water suction pipe in the prefabricated anti-floating sump, and pump water in the prefabricated anti-floating sump through the water pump. Step 4. Construction of rigid waterproof cushion: Conduct the construction of the rigid waterproof cushion at the bottom of the foundation pit. The connection part between the light well point dewatering pipe and the rigid waterproof cushion is waterproofed with a water stop steel ring and waterproof sealant, and a permanent pressure reducing drainage pipe network is buried in the rigid waterproof cushion. Step 5. Treatment of anti-pulling piles: There are embedded grooves reserved on the anti-pulling piles, and expansion water stop strips are installed in the embedded grooves. Step 6. Construction of waterproof concrete floor slab: Set a water stop steel ring and waterproof sealant at the connection between the light well point dewatering pipe and the waterproof concrete floor slab, set a floor slab pressure reducing drain pipe in the pouring area of the waterproof concrete floor slab, install a repeated grouting pipe and an extended repeated grouting pipe around the water stop steel ring; set a construction joint dense mesh fixing bracket at the construction joint position of the waterproof concrete floor slab, and install the dense mesh through the construction joint dense mesh fixing bracket; after the dense mesh installation is completed, conduct the concrete pouring operation of the waterproof concrete floor slab.

[0007] Preferably, in Step 3, when fixing the prefabricated anti-floating sump through the anti-floating anchor steel pipes, the anti-floating anchor steel pipes are obliquely driven into the foundation pit soil, the upper end of the foundation pit soil is connected to the sump anchoring holes on the prefabricated anti-floating sump, and concrete grouting is carried out into the anti-floating anchor steel pipes.

[0008] Preferably, in Step 5, the surfaces of the connection parts between the anti-pulling piles and the waterproof concrete floor slab and the rigid waterproof cushion are coated with cement-based penetrating crystalline materials.

[0009] Preferably, in Step 6, the construction joint dense mesh fixing bracket includes a bracket main body formed by binding bracket transverse fixing steel bars and bracket stirrups. A water stop steel plate is arranged in the middle of the bracket main body. Dense mesh external fixing steel bars are arranged on the outside of the bracket main body, and bracket adjusting vertical supports and adjusting parts are arranged on the inside of the bracket main body. The adjusting parts are arranged between the bracket adjusting vertical supports and the bracket main body, and the distance between the bracket adjusting vertical supports and the bracket main body is adjusted through the adjusting parts; after the bracket main body is adjusted in place, the bracket main body is fixedly connected to the upper main reinforcement and the lower main reinforcement of the floor slab, and the dense mesh is installed on the dense mesh external fixing steel bars.

[0010] Preferably, the adjusting member includes adjusting rods correspondingly arranged on the bracket main body and the bracket adjustment vertical support, an adjusting sleeve is connected between the two corresponding adjusting rods, the adjusting sleeve is threadedly connected to the adjusting rod, and the length of the adjusting member is adjusted by rotating the adjusting sleeve, thereby adjusting the position of the bracket main body.

[0011] A bedrock fissure water rigid control foundation raft combined drainage system is constructed by a construction method of a bedrock fissure water rigid control foundation raft combined drainage system.

[0012] The present invention has the following characteristics and beneficial effects: (1) Use prefabricated and assembled anti-floating sump for bottom plate drainage system construction to improve the construction efficiency of foundation raft combined drainage system.

[0013] (2) Use a rigid waterproof cushion layer, a waterproof concrete base plate, a permanent pressure-reducing drainage network and a base plate pressure-reducing drainage pipe to drain and waterproof the base plate, thereby improving the drainage and anti-seepage effects of the base plate.

[0014] (3) Use the construction joint mesh fixing bracket to accurately locate and install the mesh at the construction joint position, thereby improving the installation quality and construction efficiency of the mesh. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the structural diagram of the bedrock fissure water rigid control foundation raft combined drainage system; Figure 2 This is a structural diagram of a prefabricated anti-floating sump; Figure 3 It is a structural diagram of construction joint treatment; Figure 4 This is a structural diagram of pull-out pile treatment.

[0016] Figure: 1, rigid waterproof cushion; 2, lower water-stop steel ring; 3, waterproof sealant; 4, permanent pressure-reducing drainage network; 5, water-stop steel ring; 6, bottom plate pressure-reducing drainage pipe; 7, extended repeated grouting pipe; 8, light well point dewatering pipe; 9, waterproof concrete bottom plate; 10, repeated grouting pipe; 11, prefabricated anti-floating water collection pit; 12, water pump; 13, anchored anti-floating steel pipe; 14, water collection well anchor hole; 15, pumping pipe; 16, water inlet hole; 17, foundation pit soil Body; 18, grouting hole; 19, construction joint mesh fixing bracket; 20, waterstop steel plate; 21, post-cast concrete base plate; 22, bracket horizontal fixing steel bar; 23, adjustment sleeve; 24, base plate lower main bar; 25, bracket adjustment vertical support; 26, base plate upper main bar; 27, adjustment rod; 28, bracket stirrup; 29, mesh external fixing steel bar; 30, pull-out pile; 32, cement-based penetrating crystallization material; 33, fitting groove; 34, expansion waterstop. DETAILED DESCRIPTION

[0017] In the embodiments of the present invention, the construction technical requirements such as the treatment of the detailed structure are not elaborated herein again. The embodiments of the present invention will be mainly described below. The present invention will be further described in detail with reference to the accompanying drawings and through embodiments, and this description is not limited to the following embodiments.

[0018] Figure 1 It is a structural diagram of the combined waterproof and drainage system of the rigid control foundation raft for bedrock fissure water. Figure 2 It is a structural diagram of the prefabricated and assembled anti-floating sump ¹¹. Figure 3 It is a structural diagram of the construction joint treatment. Figure 4 It is a structural diagram of the anti-pulling pile treatment.

[0019] As Figure 1 shown in the structural diagram of the combined waterproof and drainage system of the rigid control foundation raft for bedrock fissure water, it includes a rigid waterproof cushion ¹, a lower water-stop steel ring ², a waterproof sealant ³, a permanent pressure-reducing drainage pipe network ⁴, a water-stop steel ring ⁵, a bottom plate pressure-reducing drainage pipe ⁶, an extended repeated grouting pipe ⁷, a light well point dewatering pipe ⁸, a waterproof concrete bottom plate ⁹, and a repeated grouting pipe ¹⁰. The rigid waterproof cushion ¹ is arranged at the bottom of the waterproof concrete bottom plate ⁹. For the construction of the combined waterproof and drainage system of the rigid control foundation raft for bedrock fissure water, the light well point dewatering pipe ⁸ is driven in the foundation pit. The water-stop steel ring ⁵ and the waterproof sealant ³ are arranged at the connecting parts of the light well point dewatering pipe ⁸ with the lower rigid waterproof cushion ¹ and the waterproof concrete bottom plate ⁹, and waterproof treatment is carried out through the water-stop steel ring ⁵ and the waterproof sealant ³. The permanent pressure-reducing drainage pipe network ⁴ is arranged in the rigid waterproof cushion ¹, the bottom plate pressure-reducing drainage pipe ⁶ is arranged in the waterproof concrete bottom plate ⁹, and the repeated grouting pipe ¹⁰ and the extended repeated grouting pipe ⁷ are arranged around the water-stop steel ring ⁵.

[0020] As Figure 2 shown in the structural diagram of the prefabricated and assembled anti-floating sump, a prefabricated and assembled anti-floating sump ¹¹ is arranged in the combined waterproof and drainage system of the rigid control foundation raft for bedrock fissure water. The prefabricated and assembled anti-floating sump ¹¹ is arranged on the foundation pit soil mass ¹⁷. The sump anchoring holes ¹⁴ and the water inlet holes ¹⁶ are respectively arranged on both sides of the prefabricated and assembled anti-floating sump ¹¹. The anchoring anti-floating steel pipe ¹³ is arranged in the sump anchoring hole ¹⁴. The upper end of the anchoring anti-floating steel pipe ¹³ is connected with the sump anchoring hole ¹⁴. The grouting holes ¹⁸ are arranged on the anchoring anti-floating steel pipe ¹³. The lower part of the anchoring anti-floating steel pipe ¹³ is inserted into the foundation pit soil mass ¹⁷. A water pump ¹² is arranged in the prefabricated and assembled anti-floating sump ¹¹, and a water suction pipe ¹⁵ is connected to the water pump.

[0021] As Figure 3The structure diagram of the construction joint treatment is shown as follows. For the construction joint of the waterproof concrete floor slab 9, a dense mesh is installed by using a dense mesh fixing bracket 19 for the construction joint. The dense mesh fixing bracket 19 for the construction joint includes a bracket main body formed by binding a transverse fixing steel bar 22 of the bracket and a stirrup 28 of the bracket. A water stop steel plate 20 is arranged in the middle of the bracket main body. An external fixing steel bar 29 for the dense mesh is arranged on the outer side of the bracket main body. A vertical support 25 for adjusting the bracket and an adjusting member are arranged on the inner side of the bracket main body. The adjusting member is arranged between the vertical support 25 for adjusting the bracket and the bracket main body, and is used to adjust the distance between the vertical support 25 for adjusting the bracket and the bracket main body. Among them, the adjusting member includes adjusting rods 27 correspondingly arranged on the bracket main body and the vertical support 25 for adjusting the bracket. An adjusting sleeve 27 is connected between the two corresponding adjusting rods 27. The adjusting sleeve 27 is threadedly connected with the adjusting rod 27. The length of the adjusting member is adjusted by rotating the adjusting sleeve, so as to adjust the position of the bracket main body. After the bracket main body is adjusted in place, the bracket main body is fixedly connected with the upper main reinforcement 26 of the floor slab and the lower main reinforcement 24 of the floor slab.

[0022] As Figure 4 The structure diagram of the anti-pulling pile treatment is shown as follows. In the combined waterproof and drainage system of the rigid control foundation raft for bedrock fissure water, an embedding groove 33 is reserved on the anti-pulling pile 30, and an expansion water stop strip 34 is arranged in the embedding groove 33. The surfaces of the connection parts of the anti-pulling pile 30 with the waterproof concrete floor slab 9 and the rigid waterproof cushion layer 1 are coated with a cement-based permeable crystalline material 32.

[0023] The construction method of the combined waterproof and drainage system of the rigid control foundation raft for bedrock fissure water specifically includes the following steps: Step 1: Carry out the construction of foundation pit excavation and support; Step 2: Drive light well point dewatering pipes in the foundation pit; Step 3: Construction of the prefabricated assembled anti-floating sump 11: Install the prefabricated assembled anti-floating sump 11 on the foundation pit soil body 17. The prefabricated assembled anti-floating sump 11 is respectively provided with a sump anchoring hole 14 and a water inlet hole 16 on both sides. The prefabricated assembled anti-floating sump 11 is fixed by using an anchoring anti-floating steel pipe 13; a grouting hole 18 is arranged on the anchoring anti-floating steel pipe 13; when the prefabricated assembled anti-floating sump 11 is fixed by using the anchoring anti-floating steel pipe 13, the anchoring anti-floating steel pipe 13 is obliquely driven into the foundation pit soil body 17. The upper end of the foundation pit soil body 17 is connected with the sump anchoring hole 14 on the prefabricated assembled anti-floating sump 11, and concrete grouting is carried out into the anchoring anti-floating steel pipe 13; after the prefabricated assembled anti-floating sump 11 is fixed, a water pump 12 and a water suction pipe 15 are installed in the prefabricated assembled anti-floating sump 11, and the water in the prefabricated assembled anti-floating sump 11 is pumped by the water pump 12.

[0024] Step 4. Construction of the rigid waterproof cushion layer 1: The rigid waterproof cushion layer 1 is constructed at the bottom of the foundation pit. The connection part between the light well point dewatering pipe 8 and the rigid waterproof cushion layer 1 is waterproofed by using a water stop steel ring 5 and a waterproof sealant 3. A permanent pressure relief drainage pipe network 4 is buried in the rigid waterproof cushion layer 1; Step 5. Treatment of the uplift piles: An embedded groove 33 is reserved on the uplift pile 30, and an expansion water stop strip 34 is installed in the embedded groove 33. The surfaces of the connection parts between the uplift pile 30 and the waterproof concrete floor slab 9 and the rigid waterproof cushion layer 1 are coated with a cement-based penetrating crystalline material 32; Step 6. Construction of the waterproof concrete floor slab 9: A water stop steel ring 5 and a waterproof sealant 3 are arranged at the connection between the light well point dewatering pipe 8 and the waterproof concrete floor slab 9, and waterproof treatment is carried out through the water stop steel ring 5 and the waterproof sealant 3. A floor slab pressure relief drainage pipe 6 is arranged in the pouring area of the waterproof concrete floor slab 9. A repeated grouting pipe 10 and an extended repeated grouting pipe 7 are installed around the water stop steel ring 5; A construction joint dense mesh fixing bracket 19 is arranged at the construction joint position of the waterproof concrete floor slab 9, and a dense mesh is installed through the construction joint dense mesh fixing bracket 19; The construction joint dense mesh fixing bracket 19 includes a bracket main body formed by binding a bracket transverse fixing steel bar 22 and a bracket stirrup 28. A water stop steel plate 20 is arranged in the middle of the bracket main body. A dense mesh external fixing steel bar 29 is arranged on the outer side of the bracket main body. A bracket adjusting vertical support 25 and an adjusting part are arranged on the inner side of the bracket main body. The adjusting part is arranged between the bracket adjusting vertical support 25 and the bracket main body, and the distance between the bracket adjusting vertical support 25 and the bracket main body is adjusted through the adjusting part; After the bracket main body is adjusted in place, the bracket main body is fixedly connected to the upper main reinforcement 26 and the lower main reinforcement 24 of the floor slab, and the dense mesh is installed on the dense mesh external fixing steel bar 29; After the dense mesh installation is completed, the concrete pouring operation of the waterproof concrete floor slab 9 is carried out.

[0025] A rigid prevention and control foundation raft combined water prevention and drainage system for bedrock fissure water is obtained by constructing according to the construction method of the above-mentioned rigid prevention and control foundation raft combined water prevention and drainage system for bedrock fissure water.

[0026] The present invention is not limited to the above best implementation mode. Anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to that of the present application, it falls within the protection scope of the present invention.

Claims

1. Construction method of rigid prevention and control combined waterproof and drainage system for bedrock fissure water in raft foundation slab, specifically including the following steps: Step 1: Carry out foundation pit excavation and support construction; Step 2: Drive light well point dewatering pipes in the foundation pit; Step 3: Construction of prefabricated assembled anti-floating sump (11): Install the prefabricated assembled anti-floating sump (11) on the foundation pit soil body (17). There are a sump anchoring hole (14) and a water inlet hole (16) respectively arranged on both sides of the prefabricated assembled anti-floating sump (11). Fix the prefabricated assembled anti-floating sump (11) through the anchoring anti-floating steel pipe (13); there is a grouting hole (18) on the anchoring anti-floating steel pipe (13); after the prefabricated assembled anti-floating sump (11) is fixed, install a water pump (12) and a water extraction pipe (15) in the prefabricated assembled anti-floating sump (11), and carry out water extraction operation in the prefabricated assembled anti-floating sump (11) through the water pump (12); Step 4: Construct a rigid waterproof cushion layer (1) at the bottom of the foundation pit; Step 5: Treatment of anti-pull piles: There is an embedded groove (33) reserved on the anti-pull pile (30), and install an expansion water stop strip (34) in the embedded groove (33); Step 6: Construct a waterproof concrete floor slab (9).

2. The construction method of the combined waterproof and drainage system for the rigid prevention and control foundation raft of bedrock fissure water according to claim 1, characterized in that In Step 3, when fixing the prefabricated assembled anti-floating sump (11) through the anchoring anti-floating steel pipe (13), drive the anchoring anti-floating steel pipe (13) obliquely into the foundation pit soil body (17). The upper end of the foundation pit soil body (17) is connected to the sump anchoring hole (14) on the prefabricated assembled anti-floating sump (11), and inject concrete into the anchoring anti-floating steel pipe (13).

3. The construction method of the combined waterproof and drainage system of the rigid prevention and control foundation raft for bedrock fissure water according to claim 1, characterized in that, In Step 4, the connection part between the light well point dewatering pipe (8) and the rigid waterproof cushion layer (1) is waterproofed by a water stop steel ring (5) and a waterproof sealant (3).

4. The construction method of the combined waterproof and drainage system for the rigid prevention and control foundation raft of bedrock fissure water according to claim 3, characterized in that, A permanent pressure reducing drainage pipe network (4) is buried in the rigid waterproof cushion layer (1).

5. The construction method of the combined waterproof and drainage system for the rigid prevention and control foundation raft of bedrock fissure water according to claim 1, characterized in that In Step 5, the surface of the connection part between the anti-pull pile (30) and the waterproof concrete floor slab (9) and the rigid waterproof cushion layer (1) is coated with a cement-based penetrating crystalline material (32).

6. The construction method of the combined waterproof and drainage system of the rigid prevention and control foundation raft for bedrock fissure water according to claim 1, characterized in that, In Step 6, the construction method of the waterproof concrete floor slab (9) is as follows: Set a water stop steel ring (5) and a waterproof sealant (3) at the connection between the light well point dewatering pipe (8) and the waterproof concrete floor slab (9). Set a floor slab pressure reducing drainage pipe (6) in the pouring area of the waterproof concrete floor slab (9). Install a repeated grouting pipe (10) and an extended repeated grouting pipe (7) around the water stop steel ring (5); Set a construction joint dense mesh fixing bracket (19) at the construction joint position of the waterproof concrete floor slab (9), and install a dense mesh through the construction joint dense mesh fixing bracket (19); After the dense mesh installation is completed, carry out the concrete pouring operation of the waterproof concrete floor slab (9).

7. The construction method of the rigid prevention and control foundation raft combined waterproof and drainage system for bedrock fissure water according to claim 6, characterized in that, In Step 6, the fixing bracket (19) for the fine-mesh net at the construction joint includes a bracket main body formed by binding the transverse fixing steel bars (22) of the bracket and the stirrups (28) of the bracket. A waterstop steel plate (20) is arranged in the middle of the bracket main body. An external fixing steel bar (29) for the fine-mesh net is arranged on the outer side of the bracket main body. A vertically adjustable support (25) of the bracket and an adjusting member are arranged on the inner side of the bracket main body. The adjusting member is arranged between the vertically adjustable support (25) of the bracket and the bracket main body, and the distance between the vertically adjustable support (25) of the bracket and the bracket main body is adjusted through the adjusting member. After the bracket main body is adjusted in place, the bracket main body is fixedly connected to the upper main reinforcement bars (26) and the lower main reinforcement bars (24) of the floor slab, and the fine-mesh net is installed on the external fixing steel bars (29) for the fine-mesh net.

8. The construction method of the combined waterproof and drainage system of the rigid prevention and control foundation raft for bedrock fissure water according to claim 7, characterized in that, The adjusting member includes adjusting rods (27) correspondingly arranged on the bracket main body and the vertically adjustable support (25) of the bracket. An adjusting sleeve (23) is connected between the two corresponding adjusting rods (27). The adjusting sleeve (23) is threadedly connected to the adjusting rod (27), and the length of the adjusting member is adjusted by rotating the adjusting sleeve, thereby adjusting the position of the bracket main body.

9. A rigid prevention and control foundation raft combined waterproof and drainage system for bedrock fissure water, characterized in that, It is constructed by the construction method of the combined waterproof and drainage system for the bedrock fissure water rigid prevention and control foundation raft described in any one of Claims 1 - 8.

Images