CN115653027A - Basement waterproof board water seepage deformation reinforcing method - Google Patents

Abstract

The invention belongs to the technical field of building construction, and relates to a basement waterproof board water seepage deformation reinforcing method, which is characterized in that a plurality of prestressed anchor rods and non-prestressed anchor rods are uniformly distributed in a water seepage deformation area in a criss-cross manner, the prestressed anchor rods are adopted to ensure that a deformed original waterproof board is completely recovered and then fixed and maintained by the non-prestressed anchor rods, then the fixed and maintained effect is enhanced by a steel plate belt, and finally a fine aggregate concrete protective layer and a leveling layer are covered on the anchor rods and the steel plate belt; the method for reinforcing the waterproof board by the method disclosed by the invention is quicker and more efficient in water seepage deformation and lasting and effective in repair quality.

Description

Basement waterproof board water seepage deformation reinforcing method

Technical Field

The invention belongs to the technical field of building construction, and relates to a basement waterproof board water seepage deformation reinforcing method.

Background

In the prior art, when the basement of a building is subjected to water seepage due to moisture, the local or even all of the floor and the waterproof board have the phenomena of warping, deformation cracking, water seepage and water leakage, and the safe use of the building is seriously influenced, the method usually adopted is to carry out laying construction again after cleaning the water seepage and water leakage part, the engineering quantity is large, the treatment effect is poor, and particularly under the condition that the floor positioned at the basement part is subjected to water seepage and deformation, the waterproof board is very difficult to reinforce and repair under the condition that the construction condition is difficult to limit by small space equipment in the existing building.

Therefore, a basement waterproof board water seepage and water leakage treatment method which is faster and efficient and ensures the repair quality is needed to solve the construction difficulty.

Disclosure of Invention

The technical scheme adopted by the invention for solving the technical problem is as follows: a basement waterproof board water seepage deformation reinforcing method comprises the following steps:

the method comprises the following steps: performing stress analysis calculation according to the soil property of a field, the bearing capacity of a foundation, the general outline of an original structure foundation, the thickness of an original waterproof board, the water seepage deformation area and the deformation size, and then selecting the position and the interval of an anchor rod hole and the size, the shape and the size of a prestressed anchor rod, a non-prestressed anchor rod, a steel anchor plate and a steel plate strip for reinforcement;

step two: drilling anchor rod holes, namely drilling holes according to the positions, the intervals and the sizes of the anchor rod holes obtained in the step one;

step three: fixing reinforcing steel bars of the selected prestressed anchor rods and the non-prestressed anchor rods in anchor rod holes according to the size, shape and dimension of the prestressed anchor rods and the non-prestressed anchor rods obtained in the step one, and performing primary grouting on the anchor rods, wherein the primary grouting height of the anchor rods is the height of an original concrete base plate at the bottom of the original waterproof plate, the prestressed anchor rods and the non-prestressed anchor rods are arranged in a staggered mode at intervals, and the outermost circle of anchor rods in the deformation area of the original waterproof plate are all non-prestressed anchor rods;

step four: removing silt mixed under the waterproof board and performing waterproof repair on the original waterproof board;

step five: the prestressed anchor rod is screwed to tightly press the steel anchor plate to apply prestress to the deformation area of the original waterproof plate at the periphery of the prestressed anchor rod, so that the deformation area of the original waterproof plate is completely restored to be flat;

step six: grouting the non-prestressed anchor rod for the second time, and plugging the non-prestressed anchor rod and anchoring the anchor bars, so that the non-prestressed anchor rod performs anchoring reinforcement on the deformation area of the original waterproof plate which is completely restored to be flat and then reinforces;

step seven: removing the prestress of the prestressed anchor, replacing the stress of the prestressed anchor on the waterproof board by the non-prestressed anchor, then grouting the prestressed anchor for the second time, plugging the prestressed anchor and anchoring the anchor bars, and finally, anchoring the deformed area of the original waterproof board by the prestressed anchor and the non-prestressed anchor together and then reinforcing the prestressed anchor and the non-prestressed anchor;

step eight: polishing, cleaning and leveling an original waterproof plate under a steel plate belt, then coating an A-level structural adhesive to adhere and reinforce the steel plate belt on the original waterproof plate, and after all the steel plate belt is adhered, welding and connecting the steel plate belt and steel anchor plates on two adjacent anchor rods until all the steel anchor plates in a deformation area of the original waterproof plate are connected into a whole;

step nine: grouting and repairing local cracks and fissures on the original waterproof board by adopting epoxy resin flexible grouting liquid;

step ten: integrally coating a polymer cement-based waterproof layer on the upper surface of the original waterproof plate after grouting repair is finished;

step eleven: laying a coating isolation layer on the polymer cement-based waterproof layer;

step twelve: and paving a fine aggregate concrete protective layer and leveling layer on the upper surface of the film coating isolation layer, wherein the fine aggregate concrete protective layer and leveling layer is required to completely cover the anchor rod reinforcing bar head, the steel anchor plate and the steel plate belt, and the waterproof plate is subjected to water seepage deformation reinforcement.

Preferably, in the first step, the inner steel bar of the prestressed anchor rod is a single steel bar, the upper end of the inner steel bar of the prestressed anchor rod is provided with a thread, and the thread is provided with a nut anchor for applying prestress.

Preferably, in the first step, the inner steel bars of the non-prestressed anchor are spot-welded into bundles of 2 to 4 steel bars, the steel anchor plate is sleeved on the upper end of the inner steel bars of the non-prestressed anchor, and during anchoring, the 2 to 4 steel bars on the upper end of the inner steel bars of the non-prestressed anchor are uniformly branched and then bent and welded to the steel anchor plate.

Preferably, in the second step, the anchor rod hole drilling holes are distributed in the deformation area of the original waterproof plate in a vertically and horizontally uniform manner.

Preferably, in the second step, in order to prevent the hole deviation, slow impact is adopted during hole opening; in the drilling and punching process, uniform speed slow advance is adopted, when the resistance is large, the down-the-hole hammer is lifted upwards by about 0.30-0.50 m, the drill rod is impacted by rotary vibration again, and the drilling slag is removed after the hole is drilled to a certain depth until the hole depth meets the requirement; after the anchor rod hole is formed, the air pipe connected with the air compressor is placed in the hole, the air pipe is washed repeatedly from top to bottom and from bottom to top, and accordingly the hole is guaranteed to be free of muck.

Preferably, in the third step, the first grouting of the anchor rod is performed by a hole bottom grout return method, a grout outlet of a grouting pipe is inserted into a position 300-500mm away from the hole bottom, and grout is continuously poured from bottom to top; the grouting pipe needs to be pulled out while grouting, and the pipe pulling height does not exceed the grout liquid level in the hole until the required height of the anchoring section is reached.

Preferably, in the fifth step, the prestress is applied according to the construction sequence from the anchor rod at the midspan position of the deformation region of the original waterproof plate to the anchor rods at the periphery, the prestress application is finished manually, the prestress application is ensured to be uniform and synchronous as much as possible, and the deformation of the deformation region of the original waterproof plate is ensured to be completely restored to be flat.

Preferably, in the step ten, the polymer cement-based waterproof layer is coated twice, the total thickness is 1.0mm, and the height of the upturned wall on the periphery is 0.5 m.

Preferably, in the twelfth step, the fine aggregate concrete protective layer and leveling layer is made of a 40mm thick C25 fine aggregate concrete material.

The invention has the beneficial effects that:

the invention distributes a plurality of prestressed anchor rods and non-prestressed anchor rods in a water seepage deformation area in a criss-cross manner, adopts the prestressed anchor rods to ensure that the deformed original waterproof plate is completely recovered and then is fixedly maintained by using the non-prestressed anchor rods, then strengthens the fixing maintenance effect by the steel plate belt, and finally covers a fine aggregate concrete protective layer and a leveling layer on the anchor rods and the steel plate belt; the water seepage deformation of the structure-reinforced waterproof plate is quicker and more efficient, and the repair quality is lasting and effective.

Drawings

FIG. 1 is a schematic plan view of an anchor rod arrangement of a basement waterproof board water seepage deformation reinforcing method;

FIG. 2 is a schematic illustration of a pre-stressed anchor;

FIG. 3 is a schematic view of a non-prestressed anchor;

FIG. 4 is a plan view of a steel strip reinforcement arrangement;

FIG. 5 is a schematic view of bending and welding non-prestressed anchor bars;

fig. 6 is a schematic view of a waterproof reinforcement repair.

In the figure, 1, a prestressed anchor rod; 2. a non-prestressed anchor; 3. a steel anchor plate; 4. a steel plate strip; 5. original waterproof board; 6. the fine stone concrete protective layer is also used as a leveling layer; 7. a polymer cement-based waterproofing layer.

Detailed Description

The related art in the present invention will be described more clearly and completely with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 6, a basement waterproof board water seepage deformation reinforcing method includes the following steps:

the method comprises the following steps: according to the property of a soil layer of a field, the bearing capacity of a foundation, the general outline of the original structure foundation, the thickness of an original waterproof plate 5, the water seepage deformation area and the deformation size, carrying out stress analysis calculation, and then selecting the position and the interval of an anchor rod hole, and the size, the shape and the size of a prestressed anchor rod 1, a non-prestressed anchor rod 2, a steel anchor plate 3 and a steel plate strip 4 for reinforcement;

step two: drilling anchor rod holes, namely drilling holes according to the positions, the intervals and the sizes of the anchor rod holes obtained in the step one;

step three: fixing the reinforcing steel bars of the selected prestressed anchor rods 1 and the non-prestressed anchor rods 2 in anchor rod holes according to the size, shape and dimension of the prestressed anchor rods 1 and the non-prestressed anchor rods 2 obtained in the step one, and performing primary grouting on the anchor rods, wherein the primary grouting height of the anchor rods is the height of an original concrete base plate at the bottom of the original waterproof plate 5, the prestressed anchor rods 1 and the non-prestressed anchor rods 2 are arranged in a staggered mode at intervals, and the outermost circle of anchor rods in the deformation area of the original waterproof plate 5 are all the non-prestressed anchor rods 2;

step four: the original waterproof board 5 is cleaned of silt mixed under the waterproof board and repaired in a waterproof way;

step five: the prestressed anchor rod 1 is screwed to tightly press the steel anchor plate 3 to apply prestress to the deformation area of the original waterproof plate 5 at the periphery of the prestressed anchor rod 1, so that the deformation area of the original waterproof plate 5 is completely restored to be flat;

step six: grouting the non-prestressed anchor rods 2 for the second time, plugging the non-prestressed anchor rods 2 and anchoring the anchor bars, so that the non-prestressed anchor rods 2 perform anchoring reinforcement on deformation areas of the original waterproof plates 5 which are completely restored to be flat, and then reinforcing;

step seven: removing the prestress of the prestressed anchor rod 1, replacing the stress of the prestressed anchor rod 1 on the waterproof plate by using the non-prestressed anchor rod 2, then grouting the prestressed anchor rod 1 for the second time, plugging and anchoring the prestressed anchor rod 1 by using anchor bars, and finally, anchoring the prestressed anchor rod 1 and the non-prestressed anchor rod 2 together on the deformation area of the original waterproof plate 5 and then reinforcing;

step eight: polishing, cleaning and leveling an original waterproof plate 5 below a steel plate strip 4, then coating an A-level structural adhesive to adhere and reinforce the steel plate strip 4 on the original waterproof plate 5, and after all the steel plate strips 4 are adhered, welding and connecting the steel plate strip 4 and steel anchor plates 3 on two adjacent anchor rods until all the steel anchor plates 3 in a deformation area of the original waterproof plate 5 are connected into a whole;

step nine: grouting and repairing local cracks and fissures on the original waterproof plate 5 by adopting epoxy resin flexible grouting liquid;

step ten: integrally brushing a polymer cement-based waterproof layer 7 on the upper surface of the original waterproof plate 5 after grouting repair is finished;

step eleven: laying a coating isolation layer on the polymer cement-based waterproof layer 7;

step twelve: and paving a fine aggregate concrete protective layer and leveling layer 6 on the upper surface of the film coating isolation layer, wherein the fine aggregate concrete protective layer and leveling layer 6 is required to completely cover the anchor rod reinforcing steel bar head, the steel anchor plate 3 and the steel plate belt 4, and the waterproof plate is subjected to water seepage deformation reinforcement.

Further, in the first step, the inner steel bars of the pre-stressed anchor rods 1 are single steel bars, threads are arranged at the upper end portions of the inner steel bars of the pre-stressed anchor rods 1, and nut anchors are matched on the threads to apply pre-stress.

Further, in the first step, the inner steel bars of the non-prestressed anchor rod 2 are spot-welded into bundles of 2 to 4 steel bars, the steel anchor plate 3 is sleeved on the upper end of the inner steel bars of the non-prestressed anchor rod 2, and during anchoring, the 2 to 4 steel bars on the upper end of the inner steel bars of the non-prestressed anchor rod 2 are uniformly branched and then bent and welded to the steel anchor plate 3.

Furthermore, in the second step, the anchor rod hole drilling holes are distributed in the deformation area of the original waterproof plate 5 in a vertically and horizontally uniform distribution mode.

Further, in the second step, in order to prevent the hole deviation, slow impact is adopted during hole opening; in the drilling and punching process, uniform speed slow advance is adopted, when the resistance is large, the down-the-hole hammer is lifted upwards by about 0.30-0.50 m, the drill rod is impacted by rotary vibration again, and the drilling slag is removed after the hole is drilled to a certain depth until the hole depth meets the requirement; after the anchor rod hole is formed, the air pipe connected with the air compressor is placed into the hole, and is repeatedly washed from top to bottom and from bottom to top, so that no residue soil exists in the hole.

Further, in the third step, a hole bottom slurry return method is adopted for carrying out the first grouting of the anchor rod, a slurry outlet of a grouting pipe is inserted into a position 300-500mm away from the hole bottom, and slurry is continuously poured from bottom to top; the grouting pipe needs to be pulled out while grouting, and the pipe pulling height does not exceed the grout liquid level in the hole until the required height of the anchoring section is reached.

Further, in the fifth step, prestress is applied according to the construction sequence from the anchor rod at the midspan position of the deformation area of the original waterproof plate 5 to the anchor rods at the four peripheries, the prestress application is completed manually, the prestress application is ensured to be even and synchronous as far as possible, and the deformation of the deformation area of the original waterproof plate 5 is ensured to be completely restored to be flat.

Further, in the tenth step, the polymer cement-based waterproof layer 7 is coated twice, the total thickness is 1.0mm, and the height of the upturned wall on the periphery is 0.5 m.

Further, in the twelfth step, the fine aggregate concrete protection layer and leveling layer 6 is made of C25 fine aggregate concrete material with the thickness of 40 mm.

Examples

The embodiment is an art gallery of a certain kind in a certain city, the total building area is 5500 square meters, wherein the three floor layers are 2553 square meters in total, one floor layer is local and two floor layers are 2947 square meters in total, and the main functions of one floor layer and interlayers of the art gallery are equipment rooms, temporary exhibition halls, multimedia demonstration halls, multifunctional report halls, repair rooms, offices, stockroom and the like; the overground layer mainly has the functions of an exhibition hall, and auxiliary rooms such as duty, reception, painting and calligraphy classrooms and the like are arranged; the second layer is a painting and calligraphy exhibition hall; the three layers are fine exhibition halls.

The construction is started in 2016 and 6 months, the main body is completed in 2017 and 6 months, then the construction and decoration stage is started, and in 11 months in the same year, the gallery basement waterproof board is subjected to unexpected high-head water pressure impact, wherein the multifunctional report hall waterproof board at the elevation of-7.000 m of the basement has the phenomena of warping, deformation cracking, water seepage and water leakage locally, and the safe use of the engineering is seriously influenced. Originally designed underground outdoor waterproofing adopts two polymer cement waterproof coating films.

And (3) analyzing the water seepage reason, according to a geological exploration report of the project, underground water in the site exists below the ground surface by-12.0 m, the inner surface layer of the project land is 0.5-1.2 m thick miscellaneous filling soil, the stratum below the project land is formed by strong weathering of 1.0-6.0 m thick and slightly weathering, and the slightly weathered stratum is not penetrated.

According to the analysis of post investigation, the whole project is located in hilly and hilly slope areas, and no underground water is found in an art gallery from 2016 (6 months) of excavation of a foundation pit to 2017 (6 months) of completion of construction of the whole main body structure. Until 11 months in 2017, water suddenly breaks through underground, and the water source is analyzed to be possibly from a mountain stream system or leakage from a reservoir in a high place on the north side of the project. The height of the water head is about 1.5m, and the height of the water head is basically consistent with the depth of the basement foundation of the building embedded in the strong weathered rock stratum. The part of underground water is gathered to generate upward buoyancy to the building due to the fact that the part of underground water has no seepage place in the rock stratum. The buoyancy of the building waterproof board is about 1.5m × 10KN/m3=15KN/m2, and is smaller than the base pressure (70 KN/m 2) of the whole building waterproof board. The floating of the whole building can not be generated, and the building is safe. However, the buoyancy generates great internal force for the waterproof board of the basement, especially for the waterproof board with large span, which is the reason of deformation, warping, cracking and water seepage of the waterproof board at the multifunctional report hall.

The reinforcing scheme is characterized in that the following reinforcing treatment is carried out on the water seepage current situation of the basement waterproof bottom plate of the art gallery through site survey, accident reason analysis and inference, the following steps are divided, and reinforcing and repairing construction are carried out according to the flow:

firstly, dewatering the peripheral well points of the building;

secondly, reinforcing the basement waterproof board structure;

(III) waterproof board leakage waterproof repair;

dewatering the peripheral well points of the building; before reinforcement, underground water around the building is firstly drained, no open water appears indoors during the reinforcing and repairing period of the basement waterproof board of the art gallery building, and a well-point dewatering scheme is adopted for dewatering. The periphery of the building basement is provided with precipitation wells, water is pumped to nearby municipal rainwater wells in the wells through water pumps, and the scheme of outdoor precipitation and the detailed construction method are shown in the scheme of a construction method.

Reinforcing a basement waterproof plate anchor rod; engineering geology and site landform characteristics, the site position belongs to the transition zone from Changbai mountain to Songqing plain, belongs to low hilly landform, and the overall topography in the site is north high south low, east high west low. The project is at the low position of the sloping field.

According to the survey report, the method has no macroscopic adverse geological effect, relatively stable field area and suitability for engineering construction. The field soil layers are distributed as follows:

the first layer of miscellaneous fill: the thickness is 0.4-1.4 m, and the engineering property is poor;

second layer fully weathered granite: the core is gravel, the thickness is 1.4-6.6 m, and the engineering property is good; characteristic value of bearing capacity of foundation of 300Kpa

The third layer of strongly weathered granite: the engineering property is good, the characteristic value of the bearing capacity of the foundation is 600Kpa, and no soft layer exists below the characteristic value. Groundwater was not seen during the investigation.

Basic outline of the original structure; in the embodiment, the foundation is buried to a depth of-4 m to-7 m, the miscellaneous fill soil on the surface layer of the foundation is completely excavated, and the foundation reaches the second layer of completely weathered granite rock layer. The excavation current situation of the foundation pit completely conforms to the disclosure of geological prospecting.

The structural system adopts reinforced concrete frame structure, and the foundation form adopts independent foundation under the reinforced concrete column to add the thick concrete waterproof board scheme of 250mm, adopts concrete strip foundation under the concrete retaining wall all around.

Wherein the reinforcing bar of the waterproof board is a phi 12@200 double-layer two-way structure, and the P6 anti-permeability grade.

A waterproof plate anchor rod design scheme; according to the actual situation of a site, the design adopts a rock anchor rod and steel plate pasting mode to reinforce and repair the waterproof plate. 55 anchor rods are designed for construction, and the anchor rod plane arrangement drawing is detailed in the following:

the number of the non-prestressed anchor rods 2 is 41, and the number of the prestressed anchor rods 1 is 14. The specific arrangement is shown in figure 1. The characteristic value of the pulling resistance bearing capacity of a single anchor rod needs to be calculated as follows: and (1) calculating the rod body strength. And (2) calculating the shear strength between the mortar body and the rock-soil layer. And (3) calculating the bonding strength of the anchor rod body and the grouting body. And the small value of the calculation results of the three is taken as the characteristic value of the uplift bearing capacity of the single anchor rod. The bolt for this project is calculated as follows:

limited by the construction space in the basement, this embodiment adopts minor diameter phi 100 stock, and anti-floating head height designs according to 1.5m height, and its resistance to plucking bearing capacity eigenvalue calculates as follows:

the area of the multifunctional report hall A =11.67m = 17.1m =199.6 square meter, and 200 square meters are taken

Water buoyancy: f =200 square meter, 15 KN/square meter, 1.2=3600KN

The number of anchor rods: n =3600KN/70=51.4, and n =55 are actually arranged

Characteristic value of pulling resistance bearing capacity: nak =3600KN/55 roots =65.5KN

According to calculation, nak =70KN is actually taken, HRB400 is adopted as the rib reinforcing steel bar, and fy =360N per square meter.

(1) And calculating the area of the steel bar (according to the building slope engineering technical specification GB50330-2013 item 8.2.2)

As≥(Kb*Nak)/fy＝(2.0*70*10^3)/360＝380mm2

1 piece of 22 steel bar can be adopted, as =380mm2

(2) Anchoring length of anchor rod and stratum (according to building slope engineering technical specification GB50330-2013 item 8.2.3)

La≥(K*Nak)/(π*D*frbk)

＝2.4*70/(3.14*100*0.2)＝2.68m

(3) Anchoring length between anchor bar steel bar and anchoring mortar (according to building slope engineering technical specification GB50330-2013 item 8.2.4)

La≥(K*Nak)/(n*π*d*fb)

＝2.4*70/(1*3.14*22*2.4)＝1.01m

The rock-entering length La of a single anchor rod is more than or equal to 3.50m by comprehensively considering the factors.

And (3) solidification: in the embodiment, 30MPa cement slurry is selected, and the strength grade meets the design and national standard requirements.

Anchor rod: the method comprises the following steps that two types of prestressed anchor rods 1 and non-prestressed anchor rods 2 are adopted, and anchor bars 2 phi 16 (HRB 400) are adopted for the full-length bonding type non-prestressed anchor rods 2 and are spot-welded into bundles; the total number is 41. As shown in fig. 3. The prestressed anchor rod 1 adopts anchor bars 1 phi 22 (HRB 400), and the total number of anchor rods is as follows: 14, respectively. As shown in fig. 2.

All anchor rods are filled with cement paste, in the embodiment, 30MPa cement paste is selected and used for secondary filling, the outlet of a filling pipe is inserted into a position 300-500mm away from the bottom of a hole, the cement paste is continuously filled from bottom to top, and smooth water drainage and air exhaust from the hole are ensured. The first grouting is performed until the height reaches the bottom of the cushion layer of the original waterproof plate 5, the prestressed anchor rods 1 are grouted once before prestress is applied, and secondary grouting is performed after the prestress is completed.

The plane arrangement of the anchor rods and the anchor rod detail drawing are constructed according to the requirements in the drawing. Wherein the characteristic value Nak =70KN of the uplift bearing capacity of the anchor rod is controlled.

Anchor rod construction process flow; a. the non-prestressed anchor rod 2 construction process flow is as follows: anchor hole positioning and numbering → drill placing → drilling → anchoring → grouting and pipe drawing → secondary grouting → sealing anchor. b. The construction process flow of the prestressed anchor rod 1 is as follows: anchor hole positioning and numbering → drilling machine in place → drilling hole → anchoring → grouting and pipe drawing → maintenance → anchor rod tensioning and locking → secondary grouting → anchor sealing.

Anchor rod construction process; 1) Anchor rod pore-forming construction equipment: a hole forming machine tool: because the drilling construction is limited by the space of the basement, the drilling machine with small volume and portable full-pneumatic down-the-hole hammer is determined to be adopted for drilling, the diameter of the hole with the diameter phi of 100 is the bottom, and an air compressor and other equipment are additionally arranged. 2) Drilling and setting-out positioning: and (5) paying off according to a construction anchor rod plane layout drawing to determine hole positions, and marking and pre-inspecting. 3) Forming a hole by using an anchor rod: installing an anchor hole drilling machine, leveling, adjusting and stabilizing, starting an air compressor, forming rotary vibration by a down-the-hole hammer when air pressure reaches a certain pressure, and starting a power head of the drilling machine to drill by punching. In order to prevent hole deviation, slow impact is adopted when the hole is opened; and (3) in the drilling process, the down-the-hole hammer is slowly advanced at a constant speed, is lifted upwards when the resistance is high, the lifting distance is about 0.30-0.50 m, the drilling ruler is impacted by rotary vibration again, and drilling slag is removed after the hole is drilled to a certain depth until the hole depth reaches the design requirement. And after the drill hole reaches the designed hole depth, the bottom of the down-the-hole hammer is cleaned for 2-3 minutes by air pressure, and the drill rod is lifted to remove sediments.

The hole diameter of the anchor hole is 100mm, the hole diameter deviation is not more than 2cm, the drilling depth deviation is not less than 1% of the design depth, the drilling depth deviation is not more than 500mm of the design depth, and the hole forming depth meets the design requirement;

after the anchor hole is formed, an air pipe connected with an air compressor is placed into the hole, and is repeatedly washed from top to bottom and from bottom to top, so that the hole is ensured to be free of muck;

anchor rod body processing and manufacturing and mounting in hole: the non-prestressed anchor rod 2 is 2 phi 16 (HRB 400), and main reinforcements are spot-welded into bundles; the prestressed anchor rod 1 is 1 phi 22 (HRB 400), the upper end of the prestress is provided with a thread capable of screwing a nut so as to apply prestress on the end part of the prestressed tendon, and the thread has enough length to ensure that the stroke of the nut can deform and reset the waterproof board when the prestress is applied. The length L of the thread is more than or equal to 350mm.

Primary grouting of the anchor rod: the grouting of the anchoring section adopts a hole bottom slurry returning method, a slurry outlet of a grouting pipe is inserted into a position 300-500mm away from the hole bottom, and slurry is continuously poured from bottom to top. And (3) pulling out the grouting pipe while grouting, wherein the pipe pulling height does not exceed the grout liquid level in the hole until the height of the anchoring section meeting the design requirement is the height of the lower surface of the plain concrete cushion layer below the original waterproof plate 5.

Cleaning the waterproof board: after the primary grouting initial setting of the anchoring section in the anchor rod hole, the grouting pump is started to flush the slurry in the anchor rod hole and the slurry on the whole indoor waterproof plate, and particularly, the silt at the hollowing part of the lower part of the waterproof plate is cleaned.

Waterproof repair of the waterproof board: flexible waterproof liquid such as cement grouting liquid (PNC 901) is injected into the grouting cavity to fill gaps and cracks below the waterproof plate. And (4) performing waterproof repair on the lower part of the waterproof plate around the anchor rod drilling hole.

Application of prestress: after the mortar strength of the anchoring body of the prestressed anchor rod 1 reaches 100% of the design strength, the steel anchor plate 3, namely the bearing plate, is arranged and installed according to the design requirement of the prestressed anchor rod 1, and the screwing nut applies prestress to the free section rib body. According to the construction sequence from the anchor rods at the midspan positions of the slave plates to the anchor rods at the periphery, prestress application is manually completed by screwing nuts, and the prestress application is ensured to be even and synchronous as far as possible for the stress application of 14 prestressed anchor rods 1, so that the deformation of the waterproof plate is completely recovered to be flat.

And (3) secondary grouting of the non-prestressed anchor rod 2: after the stress construction of all the prestressed anchor rods 1 is completed, secondary grouting can be performed on the non-prestressed anchor rods 2, the plugging and anchor bar anchoring of the non-prestressed anchor rods 2 are completed according to the design requirements and the mortar requirements in the same time, and epoxy resin mortar is adopted at the grouting ports of the anchor rod holes to firmly and compactly adhere the anchor plates.

And (3) secondary grouting of the prestressed anchor rod 1: after the secondary grouting of the non-prestressed anchor rods 2 and the anchoring of the anchor bars are completed, the non-prestressed anchor rods 2 can replace the prestressed anchor rods to stress the waterproof plate. The anchor (anchor plate and nut) of the prestressed anchor rod 1 can be disassembled to release the previous prestress of the rib body, secondary grouting is carried out to the top of the waterproof plate, epoxy resin mortar is adopted at the grouting port of the anchor rod hole to firmly and compactly paste the anchor plate, and then the rib body is bent and welded to be connected with the anchor plate into a whole. As shown in fig. 5.

And (3) structural reinforcement and waterproof repair of the waterproof board: 1. and (3) structurally reinforcing the waterproof plate, namely polishing, cleaning and flattening the waterproof plate below the steel plate strip 4 by adopting the steel plate strip 4 (-1800 × 100 × 5) according to the size and the arrangement mode of the design requirement, and then coating an A-level structural adhesive to adhere and reinforce the steel plate strip 4 on the waterproof plate. After all the steel plate strips 4 are adhered, the steel plate strips 4 and the anchor plates on the anchor rods are welded into a whole. 2. Waterproof board waterproof restoration: and (3) performing grouting repair on local cracks and fissures on the waterproof board by adopting epoxy resin flexible grouting liquid. After the waterproof board is structurally reinforced and the crack is grouted and repaired, the polymer cement waterproof paint (cement PNC401 in the expansion) needs to be integrally coated on the surface of the waterproof board twice, and the total thickness is 1.0mm. The height of the upturned wall on the periphery is 0.5 m. After the waterproof construction of the surface layer is finished, a 300g polypropylene construction moisture-proof layer is used as a film coating isolation layer for laying. And then, a C25 fine stone concrete material with the thickness of 40mm is adopted as a protective layer and also used as a leveling layer, and the anchor rod reinforcing steel bar head and the steel plate belt 4 are covered to finish the reinforcement and waterproof repair of the waterproof plate. So far, the interior finishing surface layer can be constructed on the floor.

The construction of the embodiment is completed from 11 months in 2017 to 3 months in 2018, the project is used for 5 years till now, and the water seepage phenomenon of the basement waterproof board does not occur. The structure reinforcement and waterproof restoration for the engineering basement waterproof board have the following advantages:

1) And a small-diameter anchor rod system is adopted, the stress of a single anchor rod is small, and the anti-floating stress of the waterproof plate is uniformly distributed.

2) The prestressed anchor rod 1 and the non-prestressed anchor rod 2 are adopted simultaneously, and the prestressed anchor rod 1 is converted after the reinforcing effect is completed, and the non-prestressed anchor rod 2 is formed by eliminating prestress.

3) The structural durability of the anchor rod is greatly improved and enhanced by adopting a secondary grouting anchor rod mode. The adverse factor that the free section of the prestressed anchor bar is difficult to protect is eliminated. The anchor rod system not only solves the structural reinforcement of the waterproof board, but also enhances the anti-floating and anti-pulling capacity of the waterproof board.

4) The sticking steel plate belt 4 is adopted to reinforce the waterproof plate, so that the mutual connection of the steel plate belt 4 and the anchor rod bearing plate can play a respective role. The anti-floating and anti-bending capability of the waterproof board is improved.

5) For the damaged condition of the waterproof board, the effective waterproof measure is to adopt crack grouting repair and additional waterproof paint on the waterproof board.

Construction aspect:

1) The construction environment and space limitation are combined, the pore-forming equipment of a full-pneumatic down-the-hole hammer drill with small volume is adopted, the pore diameter phi of the pore-forming is 100, the diameter is the bottom, and the pore depth can reach 4m. The device is convenient and flexible to construct, small in size and suitable for drilling construction of various terranes. The equipment is convenient and reliable to construct in the basement space of the built building.

2) Adopt minor diameter drilling stock to evenly arrange according to 2m interval, the silt in the empty drum under the waterproof board of being convenient for is clear away, and is little to the damage of waterproof layer under the waterproof board, and the slip casting is restoreed also relatively easily.

3) The polymer cement-based waterproof material is integrally coated on the surface of the waterproof board, so that the waterproof performance of the basement waterproof board is enhanced, and the effect is good from the actual use time of 5 years.

In conclusion, the invention provides a basement waterproof board water seepage deformation reinforcing method, a plurality of prestressed anchor rods and non-prestressed anchor rods are distributed in a water seepage deformation area in a criss-cross mode, the prestressed anchor rods are adopted to enable a deformed original waterproof board to be completely recovered and then fixed and maintained by the non-prestressed anchor rods, then the fixing and maintaining effect is enhanced by a steel plate belt, and finally a fine aggregate concrete protective layer and a leveling layer are covered on the anchor rods and the steel plate belt; the structural reinforced waterproof board disclosed by the invention is quicker and more efficient in water seepage deformation and lasting and effective in repair quality, only the thickness of the surface layer of the original waterproof board is increased by about 50mm after the waterproof board is reinforced, and the influence on use is small, so that the structural reinforced waterproof board has a wide application prospect.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (9)

1. A basement waterproof board water seepage deformation reinforcing method is characterized by comprising the following steps:

the method comprises the following steps: carrying out stress analysis calculation according to the property of a soil layer of a field, the bearing capacity of a foundation, the general outline of the original structure foundation, the thickness of an original waterproof plate (5), the water seepage deformation area and the deformation size, and then selecting the position and the interval of an anchor rod hole, and the size, the shape and the size of a prestressed anchor rod (1), a non-prestressed anchor rod (2), a steel anchor plate (3) and a steel plate strip (4) for reinforcement;

step two: drilling anchor rod holes, namely drilling holes according to the positions, the intervals and the sizes of the anchor rod holes obtained in the step one;

step three: fixing the reinforcing steel bars of the selected pre-stressed anchor rod (1) and the non-pre-stressed anchor rod (2) in an anchor rod hole according to the size, shape and dimension of the pre-stressed anchor rod (1) and the non-pre-stressed anchor rod (2) obtained in the step one, grouting the anchor rod for the first time, wherein the height of the anchor rod for the first grouting is the height of an original concrete base plate at the bottom of the original waterproof plate (5), the pre-stressed anchor rod (1) and the non-pre-stressed anchor rod (2) are arranged in a staggered mode at intervals, and the outermost circle of anchor rods in the deformation area of the original waterproof plate (5) are all the non-pre-stressed anchor rods (2);

step four: the original waterproof board (5) is cleaned of silt mixed under the waterproof board and repaired in a waterproof way;

step five: the prestressed anchor rod (1) is screwed to tightly press the steel anchor plate (3) to apply prestress to the deformation area of the original waterproof plate (5) on the periphery of the prestressed anchor rod (1), so that the deformation area of the original waterproof plate (5) is completely restored to be flat;

step six: grouting the non-prestressed anchor rod (2) for the second time, plugging the non-prestressed anchor rod (2) and anchoring the anchor bars, so that the non-prestressed anchor rod (2) performs anchoring reinforcement on the deformation area of the original waterproof plate (5) which is completely restored to be flat, and then reinforcing;

step seven: the prestress of the prestressed anchor rod (1) is removed, the non-prestressed anchor rod (2) is used for replacing the stress of the prestressed anchor rod (1) on the waterproof plate, then the prestressed anchor rod (1) is grouted for the second time, the prestressed anchor rod (1) is blocked and anchored by anchor bars, and finally the prestressed anchor rod (1) and the non-prestressed anchor rod (2) jointly anchor the deformation area of the original waterproof plate (5) and then are reinforced;

step eight: polishing, cleaning and leveling an original waterproof plate (5) below a steel plate strip (4), then coating an A-level structural adhesive to adhere and reinforce the steel plate strip (4) on the original waterproof plate (5), and after all the steel plate strips (4) are adhered, welding and connecting the steel plate strip (4) with steel anchor plates (3) on two adjacent anchor rods until all the steel anchor plates (3) in a deformation area of the original waterproof plate (5) are connected into a whole;

step nine: local cracks and fissures on the original waterproof plate (5) are repaired by grouting by adopting epoxy resin flexible grouting liquid;

step ten: integrally brushing a polymer cement-based waterproof layer (7) on the upper surface of the original waterproof plate (5) after grouting repair is finished;

step eleven: laying a coating isolation layer on the polymer cement-based waterproof layer (7);

step twelve: and paving a fine aggregate concrete protective layer and leveling layer (6) on the upper surface of the coating isolation layer, wherein the fine aggregate concrete protective layer and leveling layer (6) is required to completely cover the anchor rod reinforcing head, the steel anchor plate (3) and the steel plate strip (4), and the water seepage deformation reinforcement of the waterproof plate is completed.

2. The basement waterproofing plate water seepage deformation strengthening method according to claim 1, wherein in the first step, the inner steel bar of the pre-stressed anchor rod (1) is a single steel bar, the upper end part of the inner steel bar of the pre-stressed anchor rod (1) is provided with a thread, and the thread is provided with a nut anchorage device for applying pre-stress.

3. The basement waterproofing plate water seepage deformation strengthening method according to claim 1, wherein in the first step, the inner steel bars of the non-prestressed anchor rods (2) are spot-welded into bundles of 2 to 4 steel bars, the steel anchor plates (3) are sleeved on the upper ends of the inner steel bars of the non-prestressed anchor rods (2), and during anchoring strengthening, the 2 to 4 steel bars on the upper ends of the inner steel bars of the non-prestressed anchor rods (2) are evenly forked, bent and welded to the steel anchor plates (3).

4. The basement waterproofing plate water seepage deformation reinforcing method according to claim 1, wherein in the second step, the anchor rod hole drilling holes are distributed in the deformation area of the original waterproofing plate (5) in a vertically and horizontally uniform manner.

5. The basement waterproofing plate water seepage deformation reinforcing method according to claim 1, wherein in the second step, in order to prevent hole deviation, slow impact is adopted during hole opening; in the drilling process, uniform slow advance is adopted, the down-the-hole hammer is lifted upwards when the resistance is large, the lifting distance is about 0.30-0.50 m, the drilling ruler is impacted along with the rotary vibration again, and drilling slag is removed after the hole is drilled to a certain depth until the hole depth meets the requirement; after the anchor rod hole is formed, the air pipe connected with the air compressor is placed in the hole, the air pipe is washed repeatedly from top to bottom and from bottom to top, and accordingly the hole is guaranteed to be free of muck.

6. The basement waterproof board water seepage deformation reinforcing method according to claim 1, wherein in the third step, a hole bottom slurry returning method is adopted for first slurry injection of the anchor rod, a slurry outlet of a slurry injection pipe is inserted 300-500mm away from the hole bottom, and slurry is continuously injected from bottom to top; the grouting pipe needs to be pulled out while grouting, and the pipe pulling height does not exceed the grout liquid level in the hole until the required height of the anchoring section is reached.

7. The basement waterproof board water seepage deformation reinforcing method according to claim 1, wherein in the fifth step, prestress is applied according to a construction sequence from a cross-center anchor rod to a peripheral anchor rod in a deformation area of an original waterproof board (5), the prestress application is completed manually, and the prestress application is ensured to be as uniform and synchronous as possible to ensure that the deformation of the deformation area of the original waterproof board (5) is completely restored to be flat.

8. The basement waterproof board water seepage deformation reinforcing method according to claim 1, wherein in the tenth step, the polymer cement-based waterproof layer (7) is coated twice, the total thickness is 1.0mm, and the height of the surrounding upturned wall is 0.5 m.

9. The basement waterproofing plate water seepage deformation reinforcing method according to claim 1, wherein in the twelfth step, the fine stone concrete protection layer and leveling layer (6) is made of C25 fine stone concrete material with the thickness of 40 mm.

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