A method and structure for preventing leakage at the junction of new and old buildings

Abstract

The present invention discloses a method and structure for preventing leakage at the junction of new and old buildings. The method includes a method for preventing leakage at the vertical junction of new and old buildings, comprising: forming grooves in an existing base plate and an existing wall to form interconnected grooves; filling the grooves with bentonite waterproof slurry; laying the ends of the old waterproof layer on the existing wall on the bentonite waterproof slurry at the grooves; constructing a new base plate and a new wall of the new building, connecting the new base plate to the existing base plate, and vertically connecting the new wall to the existing wall; laying a new waterproof layer on the outer surface of the new wall and extending it to the bentonite waterproof slurry at the grooves of the wall; using metal strips to press and seal the new and old waterproof layers on the bentonite waterproof slurry at the grooves of the existing wall; and constructing a concrete waterstop wall, connecting the concrete waterstop wall vertically to the existing wall and the new wall and covering the new and old waterproof layers. The present invention can improve the waterproof performance at the junction of new and old buildings.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, in particular to a leakage prevention method and structure for a junction between new and old buildings. Background Art

[0002] In construction projects developed in batches, there are leakage problems at the junction of new and old buildings. A common practice in this field is to reserve waterproof joints and set up a protective layer during the construction phase of the existing old building at the junction. During the construction of the new building, the protective layer is removed, the waterproofing project is carried out, and waterstop steel plates and rubber waterstop strips are installed. Due to the long interval between the development of new and old buildings, the reserved waterproof joints may age and become damaged. At the same time, the exposed concrete of the old building has a different affinity with the concrete aggregate of the new building. Coupled with the influence of factors such as the shrinkage deformation of the newly poured concrete and the settlement of the foundation of the new building, cracks are easily generated at the junction of the concrete of the new and old buildings. The waterstop steel plates and rubber waterstop strips will settle simultaneously, creating a height difference at the junction of the new and old buildings, resulting in water leakage at the junction. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and structure for preventing leakage at the junction of new and old buildings, so as to solve the problem of leakage and waterproofing at the junction of new and old buildings.

[0004] In order to solve the above technical problems, the present invention provides a method for preventing leakage at the junction of new and old buildings, including a method for preventing leakage at the vertical junction of new and old buildings, the method for preventing leakage at the vertical junction of new and old buildings comprising:

[0005] Grooves are cut on the existing bottom plate and walls of the old building to form interconnected grooves;

[0006] Fill the tank with bentonite waterproof slurry;

[0007] Lay the end of the old waterproof layer on the existing wall of the old building on the bentonite waterproof slurry at the trough;

[0008] Constructing the new floor of the new building along the existing floor of the old building and constructing the new wall of the new building in a vertical direction of the existing wall of the old building, so that the new floor is connected to the existing floor, and the new wall is connected to the existing wall vertically;

[0009] Lay a new waterproof layer on the outer surface of the new building's new wall and extend it to the bentonite waterproof slurry at the groove of the existing wall of the old building;

[0010] Metal strips are used to press and seal the new and old waterproof layers of the new and old buildings onto the bentonite waterproof slurry in the grooves of the existing walls;

[0011] Concrete waterstop walls are constructed along the outer surfaces of the existing walls of the old building and the newly built walls of the new building, so that the concrete waterstop walls are vertically connected to the existing walls and the newly built walls and cover the new and old waterproof layers.

[0012] Furthermore, the present invention provides a method for preventing leakage at the junction of new and old buildings. When the old waterproof layer on the existing wall of the old building is damaged or aged, the old waterproof layer is re-laid.

[0013] Furthermore, the present invention provides a method for preventing leakage at the junction of new and old buildings, in which a metal strip is fixed to the bentonite waterproof slurry at the trough body by fixing nails.

[0014] Furthermore, in the method for preventing leakage at the junction of new and old buildings provided by the present invention, the fixing nails are screws or pins.

[0015] Furthermore, the present invention provides a method for preventing leakage at the junction of new and old buildings. The concrete water stop wall is cast using C15 plain concrete with an anti-seepage grade of P8 and mixed with 0.9 kg / m 3 Polypropylene fiber, mixed with 12% concrete expansion agent.

[0016] Furthermore, the present invention provides a method for preventing leakage at the junction of new and old buildings, which also includes a method for preventing leakage at the junction of a new floor slab and an existing floor slab in a straight line direction between the new and old buildings. The method for preventing leakage at the junction of a new floor slab and an existing floor slab in a straight line direction between the new and old buildings includes:

[0017] Roughen the side walls of the existing baseboards of old buildings;

[0018] Two water-swelling waterstop strips are provided on the side wall of the existing bottom plate, and the two water-swelling waterstop strips are respectively provided at 1 / 4 and 3 / 4 of the thickness of the existing bottom plate;

[0019] A grouting pipe is pre-buried at the center of the side wall of the existing bottom plate. The grouting pipe is provided with slurry outlet holes along its length. A tee is installed on the grouting pipe. The tee includes a connecting end connected to the grouting pipe and a grouting end perpendicular to the connecting end.

[0020] Construct the new floor slab of the new building along the straight line of the existing floor slab, connect the new floor slab with the existing floor slab, and distribute two water-expandable waterstop strips and grouting pipes at the junction of the new floor slab and the existing floor slab;

[0021] The grouting end of the tee pipe extends out from the upper surface of the newly built base plate.

[0022] In order to solve the above technical problems, the present invention provides an anti-leakage structure at the junction of new and old buildings, including: an anti-leakage structure at the vertical junction of new and old buildings, the anti-leakage structure at the vertical junction of new and old buildings including:

[0023] Grooves are cut on the existing bottom plate and walls of the old building to form interconnected grooves;

[0024] Bentonite waterproof slurry filled in the tank;

[0025] The end of the old waterproof layer on the existing wall of the old building is laid on the bentonite waterproof slurry at the trough;

[0026] Constructing a new floor slab of the new building along the existing floor slab of the old building and constructing a new wall of the new building in a vertical direction of the existing wall of the old building, wherein the new floor slab is connected to the existing floor slab, and the new wall is connected to the existing wall vertically;

[0027] A new waterproof layer is laid on the outer surface of the new wall of the new building, and the end of the new waterproof layer is placed on the bentonite waterproof slurry at the groove of the existing wall of the old building;

[0028] A metal strip is provided at the junction of the new and old waterproof layers, and the metal strip is pressed against the new and old waterproof layers and fixed on the bentonite waterproof slurry at the groove of the existing wall;

[0029] A concrete water stop wall is constructed along the outer sides of the existing walls of the old building and the newly built walls of the new building. The concrete water stop wall is vertically connected to the existing walls and the newly built walls and covers the old and new waterproof layers.

[0030] Furthermore, the present invention provides an anti-seepage structure at the junction of new and old buildings, in which metal strips are pressed together with the new and old waterproof layers by fixing nails to the bentonite waterproof slurry at the groove of the existing wall.

[0031] Furthermore, in the method for preventing leakage at the junction of new and old buildings provided by the present invention, the fixing nails are screws or pins.

[0032] Furthermore, the anti-leakage structure at the junction of new and old buildings provided by the present invention also includes an anti-leakage structure at the intersection of the new floor plate and the existing floor plate of the new and old buildings in a straight line direction, and the anti-leakage structure at the intersection of the new floor plate and the existing floor plate of the new and old buildings in a straight line direction includes:

[0033] Two water-swelling waterstop strips and a grouting pipe are arranged on the side wall at the junction of the existing base plate of the old building and the newly built base plate of the new building. The two water-swelling waterstop strips are respectively arranged at 1 / 4 and 3 / 4 of the thickness of the side wall. The grouting pipe is arranged at 2 / 4 of the thickness of the side wall. The grouting pipe is provided with slurry holes along its length direction. A tee pipe is installed on the grouting pipe. The tee pipe includes a connecting end connected to the grouting pipe and a grouting end perpendicular to the connecting end. The grouting end extends out of the upper surface of the newly built base plate.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a method and structure for preventing leakage at the junction of new and old buildings. The method and structure comprise a trough on an existing wall and a bentonite waterproof slurry filled therein, a new and old waterproof layer laid on the bentonite waterproof slurry, a metal strip pressed onto the new and old waterproof layers and fixedly arranged on the bentonite waterproof slurry, and a concrete waterstop wall vertically connected to the existing wall and the newly built wall to form an anti-seepage structure at the vertical junction of the new and old buildings. The new and old waterproof layers are pressed and sealed in the bentonite waterproof slurry by the metal strip. The high expansibility, low permeability, and self-healing crack-repairing features of the bentonite waterproof slurry can effectively solve the defect that the new and old waterproof layers of the old and new buildings cannot be closed. Moreover, the bentonite waterproof slurry can effectively fill the lap joints, nail holes and pores in the concrete to form a dense and continuous gel waterproof layer in the groove body, thereby preventing leakage at the junction of the new and old waterproof layers; the shielding of the junction of the new and old waterproof layers by the concrete water wall can further improve the anti-leakage problem of the junction of the new and old waterproof layers, and the connection of the concrete water wall with the existing wall and the new wall respectively enables the concrete water stop wall to block the leakage of water on the outer side of the new wall and the existing wall to form a water stop barrier, preventing the leakage water from directly impacting the corners of the new wall and the existing wall, thereby improving the waterproof ability of the outer side of the new wall and the existing wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figures 1 to 2 It is a planar structural diagram of the anti-leakage structure at the vertical junction of the new and old buildings;

[0037] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0038] Figure 4 It is a side perspective structural diagram of the anti-leakage structure at the straight line intersection of the new base plate and the existing base plate of the new and old buildings;

[0039] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure at the middle BB;

[0040] As shown in the figure:

[0041] 100. Anti-leakage structure at the junction of new and old buildings;

[0042] 110. Old building, 111. Existing baseboard, 112. Existing wall, 113. Old waterproof layer;

[0043] 120. New building, 121. New baseboard, 122. New wall, 123. New waterproofing layer;

[0044] 130. Anti-seepage structure at the vertical junction of new and old buildings, 131. Trough, 132. Bentonite waterproofing slurry, 133. Metal strips, 134. Concrete waterstop wall;

[0045] 140. Foundation pit edge;

[0046] 150. Anti-seepage structure at the straight-line intersection of the new base plate and the existing base plate of the new and old buildings, 151. Water-expanding waterstop, 152. Grouting pipe, 153. Tee pipe. DETAILED DESCRIPTION

[0047] The present invention will be described in detail below with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not accurately scaled, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0048] Example 1

[0049] Please refer to Figures 1 to 5 Embodiment 1 of the present invention provides a method for preventing leakage at the junction of new and old buildings, including a method for preventing leakage at the vertical junction of new and old buildings. The method for preventing leakage at the vertical junction of new and old buildings may include the following steps:

[0050] Step 201, please refer to Figure 1 and Figure 3 , grooves are cut on the existing floor 111 and the existing wall 112 of the old building 110 to form interconnected grooves 131. The groove size can be 50×20mm (width×depth), and the groove position can be no less than 250mm from the outer side of the new wall 122.

[0051] Step 202, please refer to Figure 1 and Figure 3 , fill the bentonite waterproof slurry 132 in the tank body 131. In order to improve the filling effect, the bentonite waterproof slurry 132 can be densely filled in the tank body 131.

[0052] Step 203, please refer to Figure 1 and Figure 3 , the end of the old waterproof layer 113 on the existing wall 112 of the old building 110 is laid on the bentonite waterproof slurry 132 at the trough 131. That is, the old waterproof layer 113 ends at the bentonite waterproof slurry 132 in the trough 131.

[0053] Step 204, please refer to Figure 1 、 Figure 2 and Figure 5, construct the new floor 121 of the new building 120 along the existing floor 111 of the old building 110 and construct the new wall 122 of the new building 120 in the vertical direction of the existing wall 112 of the old building 110, so that the new floor 121 is connected to the existing floor 111, and the new wall 122 is vertically connected to the existing wall 112. In this step, Figures 1 to 2 The newly built base plate 121 is blocked by the newly built wall 122.

[0054] Step 205, please refer to Figure 1 A new waterproof layer 123 is laid on the outer surface of the newly constructed wall 122 of the new building 120 and extends to the bentonite waterproof slurry 132 in the groove 131 of the existing wall 112 of the old building 110. That is, the new waterproof layer 123 terminates at the bentonite waterproof slurry 132 in the groove 131. Both the new and old waterproof layers can be waterproof membranes.

[0055] Step 206, please refer to Figures 1 to 2 Metal strips 133 are used to press and seal the new and old waterproof layers of the new and old buildings onto the bentonite waterproof slurry 132 in the groove 131 of the existing wall 112. Both the new waterproof layer 123 and the old waterproof layer 113 can be pressed and embedded in the groove 131 of the existing wall 112 by the metal strips 133, thereby improving the sealing effect of the new and old waterproof layers and avoiding gaps. Figure 1 The metal strip 133 is not embedded in the slot 131. Figure 2 The metal strip 133 is embedded in the slot.

[0056] Step 207, please refer to Figure 2 Concrete waterstop wall 134 is constructed extending outward along the exterior surfaces of existing wall 112 of old building 110 and new wall 122 of new building 120. Concrete waterstop wall 134 is vertically connected to existing wall 112 and new wall 122 and covers both the new and old waterproof layers. For example, concrete waterstop wall 134 may extend outward along the exterior surfaces of existing wall 112 and new wall 122 by 2 meters each, forming a rectangular wall with a cross-section of 4 square meters.

[0057] Please refer to Figures 1 to 3, the first embodiment of the present invention further provides an anti-seepage structure 100 at the junction of new and old buildings, comprising: an anti-seepage structure 130 at the vertical junction of new and old buildings, the anti-seepage structure 130 at the vertical junction of new and old buildings comprising: grooves are cut on the existing bottom plate 111 and the existing wall 112 of the old building 110 to form mutually penetrating grooves 131; bentonite waterproof slurry 132 is filled in the grooves 131; the end of the old waterproof layer 113 on the existing wall 112 of the old building 110 is laid on the bentonite waterproof slurry 132 at the grooves 131; a new bottom plate 121 of the new building 120 is constructed along the existing bottom plate 111 of the old building 110 and a new wall 122 of the new building 120 is constructed in a vertical direction of the existing wall 112 of the old building 110, the new bottom plate 121 and the existing bottom plate 111 are connected to each other. 11 is connected, and the new wall 122 is vertically connected to the existing wall 112; a new waterproof layer 123 is laid on the outer surface of the new wall 122 of the new building 120, and the end of the new waterproof layer 123 is laid on the bentonite waterproof slurry 132 at the groove 131 of the existing wall 112 of the old building 110; a metal strip 133 is set at the junction of the new and old waterproof layers, and the end of the metal strip 133 is pressed and fixed on the bentonite waterproof slurry 132 at the groove 131 of the existing wall 112; a concrete waterstop wall 134 is extended outward along the outer surfaces of the existing wall 112 of the old building 110 and the new wall 122 of the new building 120, and the concrete waterstop wall 134 is vertically connected to the existing wall 112 and the new wall 122 and covers the new and old waterproof layers.

[0058] Please refer to Figures 1 to 2The first embodiment of the present invention provides a method and structure for preventing leakage at the junction of new and old buildings. The method and structure are composed of a trough 131 on the existing wall 112 and a bentonite waterproof slurry 132 filled therein, a new and old waterproof layer laid on the bentonite waterproof slurry 132, a metal strip 133 pressed on the new and old waterproof layers and fixed on the bentonite waterproof slurry 132, and a concrete water stop wall 134 vertically connected to the existing wall 112 and the newly built wall 122. The metal strip 133 is used to press the new and old waterproof layers 113 and seal them in the bentonite waterproof slurry 132. The high expansion, low permeability and self-healing crack repairing features of the bentonite waterproof slurry 132 can effectively solve the problem that the new and old waterproof layers of the old and new buildings cannot form cracks. The closed defects are effectively filled in the bentonite waterproof slurry 132, and the lap joints, nail holes and pores of the concrete are formed in the trough 131 with a dense and continuous gel waterproof layer, thereby preventing the new and old waterproof layers from leaking at the joint; the shielding of the joint of the new and old waterproof layers by the concrete water wall can further improve the anti-leakage problem of the joint of the new and old waterproof layers, and the concrete water-stop wall is connected to the existing wall 112 and the new wall 122 respectively, so that the concrete water-stop wall 134 can block the leakage of the new wall 122 and the outer side of the existing wall 112 to form a water-stop barrier, preventing the leakage water from directly impacting the corners of the new wall 122 and the existing wall 112, thereby improving the waterproof ability of the outer side of the new wall 122 and the existing wall 112.

[0059] Please refer to Figures 1 to 2 The first embodiment of the present invention provides a method and structure for preventing leakage at the junction of new and old buildings. When factors such as shrinkage and deformation of newly poured concrete of the new building 120 and settlement of the foundation of the new building 120 cause cracks and settlement at the concrete junction of the new and old buildings, the bentonite waterproof slurry 132 expands in water and can fill the height difference caused by the cracks and settlement, thereby improving the waterproof performance of the cracks and settlement.

[0060] Please refer to Figures 1 to 2 The first embodiment of the present invention provides a method and structure for preventing leakage at the junction of new and old buildings. Grooves 131 are also formed in the existing base plate 111 to prevent water leakage caused by the difference in elevation between the existing base plate 111 and the newly constructed base plate 121. Grooves 131 formed in the existing wall 112 provide the necessary space for filling with bentonite waterproofing slurry 132 and for sealing the new and old waterproof layers, thereby improving the sealing effect at the junction of the new and old waterproof layers.

[0061] Please refer to Figure 1In order to improve the waterproof effect of the old waterproof layer 113 on the existing wall, the first embodiment of the present invention provides a method and structure for preventing leakage at the junction of new and old buildings. When the old waterproof layer 113 on the existing wall 112 of the old building 110 is damaged or aged, the old waterproof layer 113 is re-laid.

[0062] In order to improve the fixing effect of the new and old waterproof layers, the first embodiment of the present invention provides a method and structure for preventing leakage at the junction of new and old buildings, in which the metal strip 133 is fixed to the bentonite waterproof slurry 132 at the groove body 131 by fixing nails such as screws and pins.

[0063] Please refer to Figure 2 In order to improve the water-stopping effect, the anti-leakage method and structure for the junction of new and old buildings provided in the first embodiment of the present invention are as follows: the casting material of the concrete water-stop wall 134 is C15 plain concrete with an anti-seepage grade of P8 and 0.9kg / m 3 Polypropylene fiber, mixed with 12% concrete expansion agent.

[0064] Example 2

[0065] Please refer to Figures 1 to 5 In order to improve the waterproof effect at the intersection of the newly built bottom plate 121 and the existing bottom plate 111 in the straight direction, the second embodiment of the present invention provides a method for preventing leakage at the intersection of new and old buildings. The method is improved on the basis of the first embodiment and also includes a method for preventing leakage at the intersection of the newly built bottom plate 121 and the existing bottom plate 111 in the straight direction of the new and old buildings. The method for preventing leakage at the intersection of the newly built bottom plate 121 and the existing bottom plate 111 in the straight direction of the new and old buildings may include:

[0066] Step 301 : roughening the sidewalls of the existing base plate 111 of the old building 110 .

[0067] Step 302 : Two water-swelling waterstop strips 151 are provided on the side wall of the existing bottom plate 111 . The two water-swelling waterstop strips 151 are respectively provided at 1 / 4 and 3 / 4 of the thickness of the existing bottom plate 111 .

[0068] In step 303, a grouting pipe 152 is pre-buried at the center of the side wall of the existing base plate 111. The grouting pipe 152 is provided with slurry holes along its length direction. A tee pipe 153 is installed on the grouting pipe 152. The tee pipe 153 includes a connecting end connected to the grouting pipe 152 and a grouting end perpendicular to the connecting end.

[0069] Step 304: Construct a new floor 121 of the new building 120 along the straight line of the existing floor 111, connecting the new floor 121 to the existing floor 111. Two water-swellable waterstops 151 and grouting pipes 152 are located at the junction of the new floor 121 and the existing floor 111. The grouting end of the tee pipe 153 extends from the upper surface of the new floor 121.

[0070] The second embodiment of the present invention further provides an anti-leakage structure 100 at the junction of a new building and an old building, and further includes an anti-leakage structure 150 at the linear junction of a new floor 121 and an existing floor 111 of the new building. The anti-leakage structure 150 at the linear junction of the new floor 121 and the existing floor 111 of the new building includes:

[0071] Two water-swelling waterstops 151 and a grouting pipe 152 are installed on the side wall at the junction of the existing floor 111 of the old building 110 and the newly built floor 121 of the new building 120. The two water-swelling waterstops 151 are respectively set at 1 / 4 and 3 / 4 of the thickness of the side wall. The grouting pipe 152 is set at 2 / 4 of the thickness of the side wall. The grouting pipe 152 is surrounded by grouting holes along its length. A tee pipe 153 is installed on the grouting pipe 152. The tee pipe 153 includes a connecting end connected to the grouting pipe 152 and a grouting end perpendicular to the connecting end. The grouting end extends above the upper surface of the newly built floor 121. The grouting end can be about 200 mm higher than the newly built floor.

[0072] The second embodiment of the present invention provides an anti-leakage structure 100 at the junction of new and old buildings. The two water-swelling waterstop strips 151 can improve the waterproofing ability of the junction of the newly built base plate 121 and the existing base plate 111, thereby reducing the risk of groundwater leakage. The pre-buried grouting pipe 152 provides convenient conditions for grouting and plugging the corresponding leakage section in the later stage. The grouting pipe 152 can be grouted at low pressure through the tee pipe 153, effectively reducing the harm caused by high-pressure grouting to the concrete and reducing the grouting cost. The grouting pipe 152 can be arranged in sections of 5 meters, and the two adjacent sections of the grouting pipe 152 can be overlapped by 200mm. The diameter of the grouting pipe 152 can be 20mm. The grouting end of the tee pipe 153 is higher than the elevation of the newly built base plate 121, which facilitates the grouting operation. After grouting the grouting pipe 152, the slurry in the grouting pipe 152 overflows from the slurry outlet and diffuses to the capillaries inside the concrete, plugging the leakage.

[0073] Example 3

[0074] The anti-leakage structure 100 for the junction of new and old buildings provided in the third embodiment of the present invention may also include a method for preventing leakage at the linear junction of the new wall 122 and the existing wall 112 of the new and old buildings, which may include:

[0075] Step 401 : roughening the sidewalls of the existing wall 112 of the old building 110 .

[0076] Step 402 : Two water-swelling waterstop strips 151 are provided on the side wall of the existing wall 112 . The two water-swelling waterstop strips 151 are provided at 1 / 4 and 3 / 4 of the thickness of the existing wall 112 , respectively.

[0077] In step 403, a grouting pipe 152 is pre-buried at the center of the side wall of the existing wall 112. The grouting pipe 152 is provided with slurry holes along its length direction. A tee pipe 153 is installed on the grouting pipe 152. The tee pipe 153 includes a connecting end connected to the grouting pipe 152 and a grouting end perpendicular to the connecting end.

[0078] Step 404: Construct a new wall 122 of the new building 120 along the straight line of the existing wall 112, connecting the new wall 122 to the existing wall 112. Two water-swellable waterstops 151 and grouting pipes 152 are located at the junction of the new wall 122 and the existing wall 112. The grouting end of the tee pipe 153 extends out of the end of the new wall 122.

[0079] The third embodiment has the same effect as the second embodiment.

[0080] The present invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only some embodiments of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention described, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A method for preventing leakage at the junction of new and old buildings, characterized in that: The invention includes a method for preventing leakage at the vertical junction of new and old buildings, and the method for preventing leakage at the vertical junction of new and old buildings includes: Grooves are cut on the existing bottom plate and walls of the old building to form interconnected grooves; Fill the tank with bentonite waterproof slurry; Lay the end of the old waterproof layer on the existing wall of the old building on the bentonite waterproof slurry at the trough; Constructing the new floor of the new building along the existing floor of the old building and constructing the new wall of the new building in a vertical direction of the existing wall of the old building, so that the new floor is connected to the existing floor, and the new wall is connected to the existing wall vertically; Lay a new waterproof layer on the outer surface of the new building's new wall and extend it to the bentonite waterproof slurry at the groove of the existing wall of the old building; Metal strips are used to press and seal the new and old waterproof layers of the new and old buildings onto the bentonite waterproof slurry in the grooves of the existing walls; Concrete waterstop walls are constructed along the outer surfaces of the existing walls of the old building and the newly built walls of the new building, so that the concrete waterstop walls are vertically connected to the existing walls and the newly built walls and cover the new and old waterproof layers.

2. The anti-leakage method at the junction of new and old buildings according to claim 1 is characterized in that: When the old waterproof layer on the existing wall of an old building is damaged or aged, the old waterproof layer is re-laid.

3. The anti-leakage method at the junction of new and old buildings according to claim 1 is characterized in that: The metal strip is fixed on the bentonite waterproof slurry at the trough body by fixing nails.

4. The anti-leakage method at the junction of new and old buildings according to claim 3 is characterized in that: The fixing nail is a screw or a pin.

5. The anti-leakage method at the junction of new and old buildings according to claim 1 is characterized in that: The concrete water stop wall is cast in C15 plain concrete with an impermeability grade of P8 and mixed with 0.9 kg / m 3 Polypropylene fiber, mixed with 12% concrete expansion agent.

6. The anti-leakage method at the junction of new and old buildings according to claim 1 is characterized in that: Also included is a method for preventing leakage at the intersection of a new floor slab and an existing floor slab of a new and old building in a straight direction, wherein the method includes: Roughen the side walls of the existing baseboards of old buildings; Two water-swelling waterstop strips are provided on the side wall of the existing bottom plate, and the two water-swelling waterstop strips are respectively provided at 1 / 4 and 3 / 4 of the thickness of the existing bottom plate; A grouting pipe is pre-buried at the center of the side wall of the existing bottom plate. The grouting pipe is provided with slurry outlet holes along its length. A tee is installed on the grouting pipe. The tee includes a connecting end connected to the grouting pipe and a grouting end perpendicular to the connecting end. Construct the new floor slab of the new building along the straight line of the existing floor slab, connect the new floor slab with the existing floor slab, and distribute two water-expandable waterstop strips and grouting pipes at the junction of the new floor slab and the existing floor slab; The grouting end of the tee pipe extends out from the upper surface of the newly built base plate. 7.An anti-leakage structure at the junction of new and old buildings, characterized in that: include: The anti-leakage structure at the vertical junction of the new and old buildings includes: Grooves are cut on the existing bottom plate and walls of the old building to form interconnected grooves; Bentonite waterproof slurry filled in the tank; The end of the old waterproof layer on the existing wall of the old building is laid on the bentonite waterproof slurry at the trough; Constructing a new floor slab of the new building along the existing floor slab of the old building and constructing a new wall of the new building in a vertical direction of the existing wall of the old building, wherein the new floor slab is connected to the existing floor slab, and the new wall is connected to the existing wall vertically; A new waterproof layer is laid on the outer surface of the new wall of the new building, and the end of the new waterproof layer is laid on the bentonite waterproof slurry at the groove of the existing wall of the old building; A metal strip is provided at the junction of the new and old waterproof layers, and the metal strip is pressed against the new and old waterproof layers and fixed on the bentonite waterproof slurry at the groove of the existing wall; A concrete water stop wall is constructed along the outer sides of the existing walls of the old building and the newly built walls of the new building. The concrete water stop wall is vertically connected to the existing walls and the newly built walls and covers the old and new waterproof layers.

8. The anti-leakage structure at the junction of new and old buildings according to claim 7 is characterized in that: The metal strips are pressed together with the old and new waterproof layers by fixing nails and are fixed on the bentonite waterproof slurry at the groove of the existing wall.

9. The anti-leakage structure at the junction of new and old buildings according to claim 8, characterized in that: The fixing nail is a screw or a pin.

10. The anti-leakage structure at the junction of new and old buildings according to claim 7, characterized in that: It also includes an anti-leakage structure at the intersection of the new floor slab and the existing floor slab of the new and old buildings in a straight direction, and the anti-leakage structure at the intersection of the new floor slab and the existing floor slab of the new and old buildings in a straight direction includes: Two water-swelling waterstop strips and a grouting pipe are arranged on the side wall at the junction of the existing base plate of the old building and the newly built base plate of the new building. The two water-swelling waterstop strips are respectively arranged at 1 / 4 and 3 / 4 of the thickness of the side wall. The grouting pipe is arranged at 2 / 4 of the thickness of the side wall. The grouting pipe is provided with slurry holes along its length direction. A tee pipe is installed on the grouting pipe. The tee pipe includes a connecting end connected to the grouting pipe and a grouting end perpendicular to the connecting end. The grouting end extends out of the upper surface of the newly built base plate.

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