Quick closing system for excavation of ultra-deep diaphragm wall I-shaped steel joint and construction method

Abstract

The invention relates to the field of water stop and seepage prevention of diaphragm wall seams, in particular to an ultra-deep diaphragm wall I-shaped steel joint excavation rapid closing system and a construction method. The I-shaped steel is arranged in the middle of the water stop plate, the I-shaped steel is in a rigid joint form at the joint of the two diaphragm walls, the position of the water stop plate covers the width of the I-shaped steel, holes are drilled in the shear bolt points, the steel bar planting glue is poured after drilling, the shear bolts are installed, and the steel bar planting glue can shorten the strength time of the shear bolts and the water stop plate; the water stop plate is fixed to the inner wall of a wall joint of the underground diaphragm wall through the shear bolts, the flatness of the water stop plate can be adjusted through the shear bolts in the grouting process, it is guaranteed that the flatness of the water stop plate is + / -2 mm, gaps around the water stop plate and the underground diaphragm wall are blocked through the water stop belts which expand when encountering water, and the sealing time is greatly shortened through the quick-setting cement. The anti-seepage device and method are high in speed, good in durability and stable in long-term use effect, and the engineering safety is ensured.

Description

Technical Field

[0001] The invention relates to the field of water stopping and anti-seepage of wall joints of ground-connected walls, and in particular to a rapid sealing system for excavation of I-steel joints of ultra-deep ground-connected walls and a construction method. Background Art

[0002] Ground-connected wall (underground continuous wall) is a common deep foundation pit support structure, which is widely used in infrastructure construction such as subways, high-rise buildings, bridges, etc. During the construction of ground-connected wall, due to the gaps between the connection parts of the walls and the effect of groundwater pressure, water seepage is prone to occur, which has a serious impact on the stability of the foundation pit and subsequent construction. Although traditional treatment methods such as cement grouting and chemical grouting can solve the water seepage problem to a certain extent, they have defects such as long construction period, high cost, and unstable effect.

[0003] Chinese invention patent "A high-quality ground-to-wall joint anti-seepage mechanism and its construction process" (application number;

[0004] CN202211491435.1) discloses a mechanism including a ground-connected wall and a water collection pipe, wherein the water collection pipe is fixedly arranged on the surrounding side of the ground-connected wall; a reaction tank, wherein the reaction tank is fixedly arranged on one side of the ground-connected wall, and at the same time, one end of the reaction tank is connected to the lower end of the water collection pipe, so as to collect the water in the water collection pipe in the reaction tank; a material discharge assembly, wherein the material discharge assembly is fixedly arranged at the upper end of the reaction tank, and is used to transport the catalyst; the existence of the water collection pipe of the present application allows the leaked water to enter the pipe and flow into the reaction tank along the pipe, and the material discharge assembly puts the catalyst into the reaction tank, removes the water through the reaction, and reduces the mud and sand in the joints during the construction of the ground-connected wall, thereby making the joints loose, causing water leakage in the wall joints, etc. The method of the present invention is to collect water rather than to prevent seepage.

[0005] In view of the extremely deep foundation pit, extremely poor geological conditions, abundant groundwater and high engineering risks, the waterproof and anti-seepage effect of the wall joints of the ground-connected wall is particularly critical. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a rapid closure system and construction method for the excavation of the I-beam joint of an ultra-deep ground-connected wall. The present invention covers the width of the I-beam through the position of the water stop plate, drills holes at the shear bolt points, and injects anchoring glue after drilling to shorten the strength time of the shear bolts and the water stop plate. The water stop plate is fixed to the inner wall of the ground-connected wall joint by the shear bolts. The shear bolts can adjust the flatness of the water stop plate during the grouting process to ensure the flatness of the water stop plate ±2mm. The gaps around the water stop plate and the ground-connected wall are sealed with water-expanding water stop strips, and the fast-drying cement greatly shortens the time to achieve the sealing effect; C40 grouting material is poured between the water stop plate and the ground-connected wall through a capillary tube, and the gas in the grouting material is discharged through the upper inner bolt hole. After the grouting material solidifies, the shear bolts fix the water stop plate through the upper inner bolt hole and the lower inner bolt hole. The anti-seepage device and method of the present invention have high speed, good durability, and stable long-term use effect, ensuring the safety of the project.

[0007] Use shear bolts and capillary tubes to fill the gap with C40 grouting material. The gas in the grouting process is discharged from the upper inner bolt hole. If the water stop plate is found to be partially uneven, the water stop plate can be leveled by loosening and tightening the shear bolt screw scale to ensure the flatness of the water stop plate. The anti-seepage device and method of the present invention have good durability, stable long-term use effect, and ensure engineering safety.

[0008] The technical solution of the present invention is: a rapid closure system for the excavation of the I-beam joint of the ultra-deep ground-connected wall, including a water stop plate arranged at the inner wall of the ground-connected wall joint below the foundation pit depth of 15m, and an upper inner bolt hole, an I-beam, and a lower inner bolt hole are arranged on the water stop plate, characterized in that: the middle part of the water stop plate is an I-beam, and the I-beam is a rigid joint form at the joint of the two ground-connected walls, the position of the water stop plate covers the width of the I-beam, a hole is drilled at the shear bolt point, and a reinforcing bar glue is poured after drilling, so as to shorten the strength time of the shear bolt and the water stop plate The water stop plate is fixed to the inner wall of the joint of the ground-connected wall by shear bolts. The shear bolts can adjust the flatness of the water stop plate during the grouting process to ensure that the flatness of the water stop plate is ±2mm. The gaps around the water stop plate and the ground-connected wall are sealed with water-swelling water stop strips. The faster-drying cement greatly shortens the time to achieve the sealing effect. The C40 grouting material is poured between the water stop plate and the ground-connected wall through a capillary tube. The gas in the grouting material is discharged through the upper inner bolt hole. After the grouting material solidifies, the shear bolts are used to fix the water stop plate through the upper inner bolt hole and the lower inner bolt hole. The anti-seepage device and method of the present invention has high speed, good durability, stable long-term use effect, and ensures engineering safety.

[0009] According to the ultra-deep ground-connected wall I-beam joint excavation rapid closure system as described above, it is characterized in that the water stop plate width w is 1m, the width K is 0.75m, and the thickness H is 10mm.

[0010] According to the ultra-deep ground-connected wall I-beam joint excavation rapid closure system as described above, it is characterized in that the I-beam is 500mm to 600mm wide and 1300mm to 1500mm long.

[0011] According to the ultra-deep ground-connected wall I-beam joint excavation rapid closure system as described above, it is characterized in that the I-beam is 500mm wide and 1410mm long.

[0012] The present invention also discloses a construction method for rapid closure of ultra-deep ground-connected wall I-steel joint excavation, comprising the following steps:

[0013] Step 1: At the inner wall of the ground-connected wall joint, break the concrete until the flange surface of the I-beam is flat;

[0014] Step 2: Drill holes on the inner wall of the ground-connected wall joint, connect the water stop plate to the ground-connected wall joint through the upper inner bolt hole and the lower inner bolt hole, and the shear bolts are loosely connected with the upper inner bolt hole and the lower inner bolt hole;

[0015] Step 3: Use water-expanding waterstop tape to seal the gaps around the waterstop plate. Compared with general quick-drying cement, it can greatly shorten the time to achieve the sealing effect, so that the waterstop plate and the ground-connected wall are in a closed space except for the upper inner bolt holes and the lower inner bolt holes:

[0016] Step 4: The capillary tube penetrates into the gap between the water stop plate and the ground connection wall through the lower inner bolt hole, and fills the gap with C40 grouting material through the capillary tube. During the grouting process, the grouting pressure of C40 grouting material is 0.25-0.35Mpa, and the gas in the grouting process is discharged from the upper inner bolt hole;

[0017] During the grouting process, if it is found that the waterstop plate is partially protruding, the waterstop plate is leveled by loosening or tightening the shear bolt screw scale to ensure that the flatness of the waterstop plate is within ±2mm, until no bubbles emerge from the upper inner bolt hole, and then the shear bolts of the upper inner bolt hole and the lower inner bolt hole are tightened; the waterstop plate is a waterstop steel plate or a waterstop rubber plate, and steel wires are inserted inside the waterstop rubber plate.

[0018] The construction method for rapid closure of I-beam joints excavated in ultra-deep ground-connected walls as described above is characterized in that it also includes a fifth step: injecting rebar glue into the water stop plate and the ground-connected wall after drilling holes, shortening the strength building time of the water stop plate and the ground-connected wall, and driving in M20 shear bolts.

[0019] According to the construction method for rapid closure of the excavation of the I-beam joint of the ultra-deep ground-connected wall as described above, it is characterized in that the model of the water stop plate is Q235b.

[0020] According to the construction method for rapid closure of the excavation of the I-beam joint of the ultra-deep ground-connected wall as described above, it is characterized in that the shear bolts are M16*140.

[0021] According to the construction method for rapid closure of excavation of I-beam joints of ultra-deep ground-connected walls as described above, it is characterized in that the width w of the water stop plate is 0.5m to 2m, the width K is 0.5m to 1m, and the thickness H is 5mm to 10mm.

[0022] According to the construction method for rapid closure of the excavation of the I-beam joints of the ultra-deep ground-connected wall as described above, it is characterized in that: in step four, the diameter of the capillary is between 2 mm and 8 mm.

[0023] The beneficial effects of the present invention are: it has the advantages of safety and reliability, the anti-seepage device and method have good durability, the effect of long-term use is stable, and the safety of the project is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a side view of the water stop plate of the present invention.

[0026] Explanation of the accompanying drawings: water stop plate 1, upper inner bolt hole 2, I-beam 3, lower inner bolt hole 4. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0028] like Figure 1 and Figure 2 As shown, the ultra-deep ground-connected wall I-beam joint excavation rapid closure system of the present invention includes a water stop plate 1 with a width w of 1m, a width K of 0.75m, and a thickness H of 10mm at the inner wall of the ground-connected wall joint below the foundation pit depth of 15m, to strengthen the water-stopping and anti-seepage of the ground-connected wall joint. The water stop plate 1 is provided with an upper inner bolt hole 2, an I-beam 3, and a lower inner bolt hole 4, and the lower inner bolt hole 4 also has a grouting function. The middle position of the water stop plate 1 is an I-beam 3, which is a rigid joint form at the joint of the two ground-connected walls. The I-beam is 500mm wide and 1410mm long. The actual value can be selected according to the processing technology, such as the I-beam is 500mm to 600mm wide and 1300mm to 1500mm long. The position of the water stop plate 1 of the present invention needs to cover the width of the I-beam to ensure that when leakage occurs, the water stop plate 3 can effectively extend the water flow seepage path and reduce the hydraulic gradient i. The waterstop plate 1 is fixed to the inner wall of the joint of the ground-connected wall by means of an I-beam 3, and the gaps around the waterstop plate 1 and the ground-connected wall are sealed with a leak-proof king; grouting material is poured between the waterstop plate 1 and the ground-connected wall through a capillary tube, and the gas in the grouting material is discharged through the upper inner bolt hole 2. After the grouting material solidifies, the shear bolts are passed through the upper inner bolt hole 2 and the lower inner bolt hole 4 to further fix the waterstop plate 1.

[0029] As a further solution of the present invention, the waterstop plate 1 can be a waterstop steel plate or a waterstop rubber plate. The waterstop rubber plate is made of water-swelling rubber or natural rubber, etc.; and steel wires are inserted inside the waterstop rubber plate to enhance the elasticity of the waterstop plate; in this way, without reducing the compressive resistance, it is convenient to timely detect whether the waterstop plate 1 has protrusions in a certain part during the grouting process.

[0030] As a further solution of the present invention, the gaps around the water stop plate 1 and the ground-connected wall are sealed with waterproof sealing rubber. The waterproof sealing rubber of the present invention has excellent elasticity. After the construction is completed, no matter it is external water seepage or internal water seepage, the waterproof sealing rubber will expand and deform to a certain extent when it comes into contact with water. Therefore, even if there are some unsealed areas, they can be automatically closed. Therefore, it can prevent water from penetrating into the wall, thereby enhancing the wall's anti-water seepage ability.

[0031] As a further solution, the leak-proof sealant in the gap around the waterstop plate 1 and the ground-connected wall can be replaced with a water-swellable waterstop strip.

[0032] The present invention also discloses a construction method for rapid closure of ultra-deep ground-connected wall I-steel joint excavation, comprising the following steps:

[0033] Step 1: At the inner wall of the ground-connected wall joint, break the concrete until the 3rd flange of the I-beam is flat;

[0034] Step 2: Drill holes on the inner wall of the ground-connected wall joint, connect the water stop plate 1 to the ground-connected wall joint through the upper inner bolt hole 2 and the lower inner bolt hole 4, the shear bolts are loosely connected with the upper inner bolt hole 2 and the lower inner bolt hole 4, the I-beam 3 is located between the water stop plate 1 and the ground-connected wall, the model of the water stop plate 1 is Q235b, and the shear bolts are M16*140: the width w of the water stop plate 1 is 0.5m to 2m, the width K is 0.5m to 1m, and the thickness H is 5 to 10mm;

[0035] Step 3: Use expansion water stop tape to seal the gaps around the water stop plate 1. The expansion water stop tape will expand when exposed to water, so that the water stop plate 1 and the ground connection wall are in a closed space except for the upper inner bolt hole 2 and the lower inner bolt hole 4:

[0036] Step 4: The capillary tube penetrates into the gap between the water stop plate 1 and the ground connection wall through the lower inner bolt hole 4, and fills the gap with C40 grouting material. During the grouting process, the grouting pressure of C40 grouting material is 0.25-0.35Mpa, and the gas in the grouting process is discharged from the upper inner bolt hole 2. In this step, the diameter of the capillary tube is generally between 2mm and 8mm, so that when not fixed, there is a certain gap between the shear bolt and the lower inner bolt hole 4, and the capillary tube can be inserted from the outside into the internal gap through the gap to perform grouting operations.

[0037] During the grouting process, if it is found that the waterstop plate 1 is partially protruding, the waterstop plate 1 should be leveled by loosening or tightening the shear bolt screw scale to ensure that the flatness of the waterstop plate 1 is within ±2mm, until no bubbles emerge from the upper inner bolt hole 2, and then tighten the shear bolts of the upper inner bolt hole 2 and the lower inner bolt hole 4 to complete the water-stopping and anti-seepage treatment of the wall joints of the ground-connected wall.

[0038] In order to enhance the effective strength, the present invention may further include a fifth step: after drilling holes in the water stop plate 1 and the ground connection wall, injecting rebar glue and driving M20 shear bolts can quickly exert strength and ensure the effective strength of the water stop plate and the wall surface. The rebar glue + shear bolts in this step can quickly exert strength and can also adjust the straightness of the water stop plate.

[0039] The present invention has a highly effective anti-seepage effect. The grouting material, the leak-proofing king and the water stop plate 1 are combined to form a multi-layer protection, which significantly improves the anti-seepage effect. The construction is relatively simple, the water stop plate 1 is easy to install, the construction period is short, and the impact on the project progress is reduced; it is economical and easy to promote: compared with the traditional grouting method, the material cost required by the present invention is lower, and the economic benefit is significant.

Claims

1. A rapid closure system for the excavation of ultra-deep ground-connected wall I-beam joints, comprising a water stop plate (1) arranged at the inner wall of the ground-connected wall joint at a foundation pit depth of less than 15m, an upper inner bolt hole (2) and a lower inner bolt hole (4) arranged on the water stop plate (1), and an I-beam (3) in the form of an original ground-connected wall joint joint. It is characterized by: The middle part of the water stop plate (1) is an I-beam (3), which is a rigid joint form at the joint of two ground-connected walls. The position of the water stop plate (1) covers the width of the I-beam. The gaps around the water stop plate (1) and the ground-connected wall are sealed with water-swelling water stop strips to shorten the time to achieve the sealing effect. Grouting material is poured between the water stop plate (1) and the ground-connected wall through a capillary tube. During the grouting process, gas is discharged through the upper inner bolt hole (2). Before the grouting material solidifies, the shear bolts are passed through the upper inner bolt hole (2) and the lower inner bolt hole (4) to fix the water stop plate (1). The water stop plate (1) is a water stop steel plate or a water stop rubber plate.

2. The ultra-deep ground-connected wall I-beam joint excavation rapid closure system according to claim 1 is characterized by: The water stop plate (1) has a width w of 1 m, a width K of 0.75 m, and a thickness H of 10 mm; the I-beam has a width of 500 mm to 600 mm, and a length of 1300 mm to 1500 mm.

3. The ultra-deep ground-connected wall I-beam joint excavation rapid closure system according to claim 1 is characterized by: The I-beam is 500mm wide and 1410mm long.

4. The ultra-deep ground-connected wall I-beam joint excavation rapid closure system according to claim 1 is characterized by: Steel wires are inserted inside the water-stop rubber plate.

5. The construction method for rapid closure of the I-beam joint excavation of the ultra-deep ground-connected wall includes the following steps: Step 1: At the inner wall of the ground-connected wall joint, break the concrete until the flange surface of the I-beam (3) is flush; Step 2: Drill holes in the inner wall of the ground-connected wall joint, connect the water stop plate (1) to the ground-connected wall joint through the upper inner bolt hole (2) and the lower inner bolt hole (4), and the shear bolt is loosely connected to the upper inner bolt hole (2) and the lower inner bolt hole (4); Step 3: Use water-expandable water-stopping tape to seal the gaps around the water-stop plate (1). This can significantly shorten the time required to achieve a sealing effect compared to common quick-drying cement, so that the water-stop plate (1) and the ground-connected wall are in a closed space except for the upper inner bolt hole (2) and the lower inner bolt hole (4). Step 4: A capillary tube is inserted into the gap between the water stop plate (1) and the ground connection wall through the lower inner bolt hole (4), and C40 grouting material is filled into the gap through the capillary tube. During the grouting process, the grouting pressure of the C40 grouting material is 0.25-0.35Mpa, and the gas in the grouting process is discharged from the upper inner bolt hole (2); During the grouting process, if it is found that the water stop plate (1) is partially protruding, the water stop plate (1) is leveled by loosening or tightening the shear bolt screw scale to ensure that the flatness of the water stop plate (1) is within ±2mm, until no bubbles emerge from the upper inner bolt hole (2), and then the shear bolts of the upper inner bolt hole (2) and the lower inner bolt hole (4) are tightened; the water stop plate (1) is a water stop steel plate or a water stop rubber plate, and steel wires are inserted into the water stop rubber plate.

6. The construction method for rapid excavation and sealing of ultra-deep ground-connected wall I-beam joints according to claim 5 is characterized by: The fifth step is to inject anchoring glue into the water stop plate (1) and the ground-connected wall after drilling holes, so as to shorten the strength time of the shear bolts and the ground-connected wall surface and ensure the fixing strength of the M20 bolts after drilling holes.

7. The construction method for rapid excavation and sealing of ultra-deep ground-connected wall I-beam joints according to claim 5 is characterized by: The model of the water stop plate (1) is Q235b.

8. The construction method for rapid excavation and sealing of ultra-deep ground-connected wall I-beam joints according to claim 5 is characterized by: The shear bolts are M16*140.

9. The construction method for rapid excavation and sealing of ultra-deep ground-connected wall I-beam joints according to claim 5 is characterized by: The width w of the water stop plate (1) is 0.5m to 2m, the width K is 0.5m to 1m, and the thickness H is 5mm to 10mm.

10. The construction method for rapid excavation and sealing of ultra-deep ground-connected wall I-beam joints according to claim 5, characterized in that: In step 4, the diameter of the capillary is between 2 mm and 8 mm.

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