Foundation structure at joint of extended building and construction method for preventing water

Abstract

The invention discloses a construction method for foundation construction and water prevention at the joint of an extended building. The construction method comprises the following steps that a, an original building foundation is excavated, and the lower portion of the structure is treated; b, treating an original building interface; c, building foundation extension construction is conducted, and grouting pipes are installed; and d, after settlement observation of the extended building foundation, pressurizing and grouting are carried out, and prevention water is formed. The concrete baffle and the tongue-and-groove are arranged, meanwhile, the water stop strip is arranged in the tongue-and-groove, and the grouting pipe is preset for pre-grouting, so that a composite waterproof treatment measure is formed, the waterproof integrity is enhanced, the water seepage prevention effect is effectively improved, waste of manpower and material resources is avoided, and the process vacancy of a traditional construction method is made up; and the water seepage risk in the extension project can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the field of waterproof construction, in particular to a construction method for expanding a foundation structure at a junction of buildings and preventing water. Background Art

[0002] In the renovation and expansion of underground projects, waterproofing facilities or practices for subsequent expansion structures are usually not reserved or pre-set.

[0003] At present, the conventional practice is to do a good job of external structural waterproofing, that is, to expand the outdoor waterproof layer of the structural roll material to connect the original outdoor waterproof layer of the roll material, set an additional layer at the construction joint, or increase the roll material waterproof layer as a whole, so as to isolate water seepage from the outside; the second is to control the quality of the structural concrete, that is, to roughen the original concrete interface, add waterproofing agent, anti-cracking agent and other additives to the structural concrete, and vibrate the concrete to make it dense during pouring, so as to ensure the self-waterproofing of the structure; the third is the indoor and outdoor waterproof layer, that is, to apply waterproof paint on the indoor wall to form an inner shell indoors, so as to achieve an indoor closed effect.

[0004] The above are the current technologies. There are no effective measures to control the waterproofing of new and old concrete construction joints. This is the most important part of waterproofing for renovation and expansion projects, but the existing technology is relatively dependent on the quality of external waterproofing and the professional quality of construction personnel. There are basically no effective measures for this weak link. Although the existing measures can reduce the risk of water seepage in the early stage of building use to a certain extent, due to factors such as uneven settlement of new and old buildings, aging or failure of waterproofing materials, and disrepair, the effect of external waterproofing is ultimately minimal. Even worse, it breaks through the external waterproofing layer and water gushes through the construction joints. After water seepage occurs, only post-grouting technology can be used to form a seal on the outside or split grouting can be used to seal the structure. At that time, it is more troublesome to deal with, time-consuming and labor-intensive, and the cost is high. The effect of one-time sealing is poor and difficult to seal. The accumulated water affects the use and appearance, and even endangers personal safety. There are many disadvantages.

[0005] Therefore, it is urgent to develop a construction method for the foundation structure and water prevention at the junction of the expanded buildings. By setting concrete baffles and tongue-and-groove grooves, setting water stop strips in the tongue-and-groove grooves, and pre-grouting through preset grouting pipes, a composite waterproofing treatment measure is formed, which strengthens the integrity of waterproofing, effectively improves the anti-seepage effect, avoids the waste of manpower and material resources, makes up for the process gaps of traditional construction methods, and can effectively avoid the risk of water seepage in expansion projects. Summary of the Invention

[0006] In view of this, the object of the present invention is to provide a construction method for expanding the foundation structure at the junction of buildings and preventing water.

[0007] The present invention provides a construction method for foundation structure and water prevention at the junction of an expanded building, comprising the following steps:

[0008] a. Excavation of the original building foundation and treatment of the lower part of the structure:

[0009] a1. Dig out the outline of the original building foundation structure along the edge of the building foundation, and excavate a basin-shaped groove at the bottom surface of the original building foundation;

[0010] a2. Lay the waterproof layer of the original building foundation evenly on the side wall of the basin-shaped trough and overlap it with the waterproof layer of the expanded building foundation;

[0011] b. Treatment of the original building interface:

[0012] b1. Open a tongue-and-groove groove in the middle of the original building interface and install a water stop at the inner corner of the bottom of the groove;

[0013] b2. Roughen the original building interface;

[0014] c. Construction of expansion building foundation and installation of grouting pipes:

[0015] c1. Plant reinforcement and set up the installation template on the original building foundation, and arrange the grouting pipe brackets at the bottom of the intersection surface. The grouting pipes are installed obliquely on the grouting pipe brackets;

[0016] c2. Concrete pouring for the foundation of the expansion building;

[0017] d. After observing the settlement of the expanded building foundation, pressure grouting is carried out to form preventive water.

[0018] Furthermore, in step a1, the basin-shaped trough is formed by excavating a certain distance downward from the bottom surface of the original building foundation and excavating a certain distance laterally into the inside of the bottom surface of the original building foundation.

[0019] Furthermore, in step a2, the waterproof layer of the original building foundation is peeled off and laid on the side wall of the basin-shaped trough, and is overlapped with the waterproof layer of the expanded building foundation according to the construction requirements of the overlapping waterproof layer.

[0020] Furthermore, in step b1, the upper portion of the tongue-and-groove is turned up at a certain angle to form an inclined surface, the bottom portion of the tongue-and-groove is tilted downward at a certain angle to form a slope, and the bottom inner corner is smoothed for installing a water stop strip.

[0021] Furthermore, in step c1, the grouting pipe is obliquely installed on the steel frame at the bottom of the intersection through the grouting pipe bracket, and the pipe mouth at one end of the grouting pipe is close to the original building intersection, and the other end extends out of the template of the expanded building foundation.

[0022] Furthermore, the grouting pipe is also provided with a sealing member for preventing concrete from pouring into the grouting pipe during pouring, and the sealing member can be removed from the grouting pipe after the concrete pouring is completed.

[0023] Furthermore, in step c2, when pouring concrete, a concrete baffle is formed under the construction joint of the interface through a basin-shaped groove; after the concrete pouring is completed, the seal is removed from the grouting pipe, and a grouting valve is installed at the end of the grouting pipe.

[0024] Furthermore, in step d, the settlement of the expanded building foundation is observed, and pressure grouting is performed on the joint construction joint through a grouting pipe to form a water prevention treatment for the joint surface.

[0025] Furthermore, after the grouting is completed, the grouting valve is closed and the slurry is allowed to solidify. After the solidification is completed, the extended grouting pipe portion is cut.

[0026] Beneficial effects of the present invention: The foundation structure and water prevention construction method at the junction of the expanded building of the present invention, by arranging concrete baffles and tongue-and-groove grooves, arranging water stop strips in the tongue-and-groove grooves, and pre-grouting through preset grouting pipes, form composite waterproofing treatment measures, thereby enhancing the integrity of waterproofing, effectively improving the anti-seepage effect, avoiding waste of manpower and material resources, making up for the process gaps of traditional construction methods, and being able to effectively avoid the risk of water seepage in expansion projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0028] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0029] Figure 1 The structural diagram of the present invention is shown in the figure: a construction method for the foundation structure and water prevention of the junction of an expanded building in this embodiment includes the following steps:

[0030] a. Excavation of the original building foundation 1 and treatment of the lower part of the structure:

[0031] a1. Dig out the structural outline of the original building foundation 1 along the edge of the building foundation, and excavate a basin-shaped groove on the bottom surface of the original building foundation 1;

[0032] a2. Lay the waterproof layer 8 of the original building foundation 1 evenly on the side wall of the basin-shaped trough and overlap it with the waterproof layer 9 of the expanded building foundation 2;

[0033] b. Treatment of the original building interface:

[0034] b1. Open a tongue-and-groove groove 4 in the middle of the original building interface, and install a water stop strip 3 at the inner corner of the bottom of the tongue-and-groove groove 4;

[0035] b2. Roughen the original building interface;

[0036] c. Construction of the expanded building foundation 2 and installation of the grouting pipe 5:

[0037] c1. Plant reinforcement and support the installation template on the original building foundation 1, and arrange the grouting pipe bracket 7 at the bottom of the intersection surface. The grouting pipe 5 is obliquely inserted and installed on the grouting pipe bracket 7;

[0038] c2. Concrete pouring for the expansion building foundation 2;

[0039] d. After observing the settlement of the expanded building foundation 2, pressure grouting is carried out to form preventive water.

[0040] In this embodiment, in step a1, the basin-shaped trough is formed by excavating a certain distance downward from the bottom surface of the original building foundation 1 and excavating a certain distance horizontally toward the inside of the bottom surface of the original building foundation 1; as shown in the figure, in step a1, the basin-shaped trough is formed by excavating a certain distance downward from the bottom surface of the original building foundation 1 and excavating a certain distance horizontally toward the inside of the bottom surface of the original building foundation 1. The basin-shaped trough can effectively increase the difficulty of groundwater seepage into the junction surface of the new and old buildings, and increase the structural strength of the junction between the new and old buildings.

[0041] In this embodiment, in step a2, the waterproof layer 8 of the original building foundation 1 is peeled off and laid on the side wall of the basin-shaped trough, and is overlapped with the waterproof layer 9 of the expanded building foundation 2 in accordance with the construction requirements of overlapping waterproof layers; as shown in the figure, in step a2, the waterproof layer 8 of the original building foundation 1 is peeled off and laid on the side wall of the basin-shaped trough, and is overlapped with the waterproof layer 9 of the expanded building foundation 2, and is overlapped with the waterproof layer 9 of the expanded building foundation 2 in accordance with the construction requirements of overlapping waterproof layers to form a new waterproof layer.

[0042] In this embodiment, in step b1, the upper part of the tongue-and-groove 4 is turned up at a certain angle to form a slope, the bottom of the tongue-and-groove 4 is tilted downward at a certain angle to form a slope, and is smoothed at the bottom inner corner for installing the water stop strip 3; as shown in the figure, in step b1, the upper part of the tongue-and-groove 4 is turned up at a certain angle to form a slope, which can reduce the cavity formed in the upper part of the tongue-and-groove 4 when pouring concrete, and reduce the structural strength at the junction of new and old buildings. At the same time, the bottom of the tongue-and-groove 4 is tilted downward at a certain angle to form a slope, which further increases the difficulty of water seepage, and is smoothed at the bottom inner corner for installing the water stop strip 3. The water stop strip 3 can effectively block water seepage. This is a prior art and will not be repeated here.

[0043] In this embodiment, in step c1, the grouting pipe 5 is obliquely installed on the steel frame at the bottom of the intersection surface through the grouting pipe bracket 7, and the pipe mouth at one end of the grouting pipe 5 is in close contact with the original building intersection surface, and the other end extends out of the template of the expanded building foundation 2; as shown in the figure, in step c1, the grouting pipe 5 is obliquely installed on the steel frame at the bottom of the intersection surface through the grouting pipe bracket 7, the grouting pipe bracket 7 is welded to the steel frame, and the pipe mouth at one end of the grouting pipe 5 is in close contact with the original building intersection surface, and the other end extends out of the template of the expanded building foundation 2, which is used for later pressurized grouting treatment of the intersection surface.

[0044] In this embodiment, the grouting pipe 5 is also provided with a sealing member for preventing concrete from pouring into the grouting pipe 5 during pouring, and the sealing member can be removed from the grouting pipe 5 after the concrete pouring is completed; as shown in the figure, the grouting pipe 5 is also provided with a sealing member for preventing concrete from pouring into the grouting pipe 5 during pouring, and the sealing member is a columnar body that conforms to the inner wall of the grouting pipe 5, and the sealing member can be removed from the grouting pipe 5 after the concrete pouring is completed.

[0045] In this embodiment, in step c2, when pouring concrete, a concrete baffle 10 is formed under the construction joint of the interface through a basin-shaped groove; after the concrete pouring is completed, the seal is taken out from the grouting pipe 5, and a grouting valve 6 is installed at the end pipe mouth of the grouting pipe 5; as shown in the figure, in step c2, when pouring concrete, a concrete baffle 10 is formed under the construction joint of the interface through a basin-shaped groove to increase the waterproof effect; after the concrete pouring is completed, the seal is taken out from the grouting pipe 5, and a grouting valve 6 is installed at the end pipe mouth of the grouting pipe 5 to prepare for subsequent pressurized grouting waterproofing.

[0046] In this embodiment, in step d, the settlement of the expanded building foundation 2 is observed, and the junction construction joint is pressurized grouting is performed through the grouting pipe 5 to form preventive water treatment of the junction surface; as shown in the figure, in step d, the settlement of the expanded building foundation 2 is observed, and after the building settlement is stabilized, the junction construction joint is pressurized grouting is performed through the grouting pipe 5 to form preventive water treatment of the junction surface.

[0047] In this embodiment, after the grouting is completed, the grouting valve 6 is closed and the slurry is allowed to solidify. After the solidification is completed, the extended grouting pipe 5 is cut; as shown in the figure, after the grouting is completed, the grouting valve 6 is closed and the slurry is allowed to solidify. After the solidification is completed, the extended grouting pipe 5 is cut to complete the water prevention treatment at the junction of the new and old buildings.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A construction method for foundation structure and water prevention at the junction of expanded buildings, characterized by: The following steps are involved: a. Excavation of the original building foundation and treatment of the lower part of the structure: a1. Dig out the outline of the original building foundation structure along the edge of the building foundation, and excavate a basin-shaped groove at the bottom surface of the original building foundation; a2. Lay the waterproof layer of the original building foundation evenly on the side wall of the basin-shaped trough and overlap it with the waterproof layer of the expanded building foundation; b. Treatment of the original building interface: b1. Open a tongue-and-groove groove in the middle of the original building interface and install a water stop at the inner corner of the bottom of the groove; b2. Roughen the original building interface; c. Construction of expansion building foundation and installation of grouting pipes: c1. Plant reinforcement and set up the installation template on the original building foundation, and arrange the grouting pipe brackets at the bottom of the intersection surface. The grouting pipes are installed obliquely on the grouting pipe brackets; c2. Concrete pouring for the foundation of the expansion building; d. After observing the settlement of the expanded building foundation, pressure grouting is carried out to form preventive water.

2. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 1 is characterized by: In step a1, the basin-shaped trough is formed by excavating a certain distance downward from the bottom surface of the original building foundation and excavating a certain distance horizontally into the inside of the bottom surface of the original building foundation.

3. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 1 is characterized by: In step a2, the waterproof layer of the original building foundation is peeled off and laid on the side wall of the basin-shaped trough, and is overlapped with the waterproof layer of the expanded building foundation according to the construction requirements of the waterproof layer overlap.

4. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 1 is characterized by: In step b1, the upper portion of the tongue-and-groove is turned up at a certain angle to form an inclined surface, the bottom portion of the tongue-and-groove is tilted downward at a certain angle to form a slope, and the bottom inner corner is smoothed for installing a water stop strip.

5. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 1 is characterized by: In step c1, the grouting pipe is obliquely installed on the steel frame at the bottom of the intersection through the grouting pipe bracket, and the pipe mouth at one end of the grouting pipe is close to the original building intersection, and the other end extends out of the template of the expanded building foundation.

6. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 5 is characterized by: The grouting pipe is also provided with a sealing member for preventing concrete from pouring into the grouting pipe during pouring. The sealing member can be taken out from the grouting pipe after the concrete pouring is completed.

7. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 1 is characterized by: In step c2, when pouring concrete, a concrete baffle is formed under the construction joint of the interface through a basin-shaped groove; after the concrete pouring is completed, the seal is removed from the grouting pipe, and a grouting valve is installed at the end of the grouting pipe.

8. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 1 is characterized by: In step d, the settlement of the expanded building foundation is observed, and pressure grouting is performed on the joint construction joint through the grouting pipe to form a water prevention treatment for the joint surface.

9. The construction method for foundation structure and water prevention at the junction of extension buildings according to claim 8 is characterized by: After the grouting is completed, close the grouting valve and wait for the slurry to solidify. After solidification, cut the extended grouting pipe part.

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