CN110387908B

CN110387908B - Multi-layer restraining anti-leakage post-pouring belt construction method

Info

Publication number: CN110387908B
Application number: CN201910684421.3A
Authority: CN
Inventors: 张伟; 张洪刚; 孙辉; 高玉亭; 孙润林; 殷明轩; 郎宇飞; 姜福华; 周斌; 邹贤飞; 郭友铭; 孙圣华
Original assignee: Shenzhen Construction Engineering Group Co Ltd
Current assignee: Shenzhen Construction Engineering Group Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2021-07-06
Anticipated expiration: 2039-07-26
Also published as: CN110387908A

Abstract

The invention relates to the technical field of post-cast strip construction, and discloses a multi-layer restrained anti-seepage post-cast strip construction method, which comprises the following construction steps of designing a post-cast strip with a trapezoidal section, covering a reinforced concrete reinforcing layer at the bottom of the post-cast strip, arranging a blind ditch above the reinforced concrete reinforcing layer, arranging a water collecting pit at the bottom of the post-cast strip, installing a folded water stop steel plate at a construction joint, chiseling the construction joint of the folded water stop steel plate, paving broken stones in the blind ditch, covering geotextile on the surfaces of the broken stones, and using a PVC pipe to press grooves to form a blind ditch, covering geotextile on the PVC pipe, and concealing the post-cast strip; through the construction, the 'two-prevention two-row' type multiple post-pouring belt is formed, the reinforced concrete reinforcing layer and the folded water-stopping steel plate are two waterproof measures respectively, the blind ditch and the pressing groove form two drainage channels of the post-pouring belt, water seeped from other parts can be drained to the pressing groove or the blind ditch nearby, the water is drained to the water collecting pit or the outer wall drainage ditch, and the leakage risk is reduced again.

Description

Multi-layer restraining anti-leakage post-pouring belt construction method

Technical Field

The invention relates to the technical field of post-cast strip construction, in particular to a multi-layer restrained anti-leakage post-cast strip construction method.

Background

In the building engineering, in order to meet the functional requirements and solve the problems of differential settlement of high-rise columns, shrinkage deformation of reinforced concrete, temperature stress of concrete and the like, the post-cast strip is widely applied to waterproof of underground engineering in the building engineering pile, and the construction of the post-cast strip is particularly important;

at present, the tendency of 'superior and inferior' of the property development and release industry is entered, and 'high quality and high speed' gradually become the consensus of property developers and are used as the admission threshold of total contract organization bidding; the water leakage and the pre-sealing of the post-cast strip are common quality problems of building construction all the time, and the construction quality control is not ideal; with the increasing requirements of the known real estate developers on engineering quality and leakage prevention, the requirements on the construction period and the quality of the real estate company are difficult to meet without the innovation and the reformation of post-pouring belt technology.

According to a conventional quality control method for a post-cast strip of a bottom plate, a concrete cushion layer is generally used for preventing water for controlling the seepage of the post-cast strip, a water-stopping steel plate is reserved in the middle of the bottom plate after a protective layer is poured, and then the bottom plate is sealed by concrete; and the basement outer wall post-cast strip is pre-sealed by conventionally building a brick enclosing wall and then backfilling earthwork.

In the prior art, the current measure for preventing the seepage of the post-cast strip is thinner and cannot achieve a good anti-seepage effect.

Disclosure of Invention

The invention aims to provide a construction method of a multi-layer restrained anti-seepage post-cast strip, and aims to solve the problem that the anti-seepage effect of the post-cast strip is poor in the prior art.

The invention discloses a construction method of a multi-layer restrained anti-leakage post-cast strip, which comprises the following construction steps:

1) designing a post-pouring belt; the cross section of the post-cast strip is in a trapezoid shape;

2) covering a reinforced concrete reinforcing layer at the bottom of the post-cast strip; the reinforced concrete reinforcing layer comprises a concrete cushion layer, a self-adhesive modified asphalt waterproof coiled material, a waterproof additional layer and fine aggregate concrete;

a, pouring the concrete cushion layer;

b, constructing the self-adhesive modified asphalt waterproof coiled material, and arranging the waterproof additional layer;

c, binding steel bars, erecting a hanging mould, and pouring the fine aggregate concrete;

3) arranging a blind ditch on the reinforced concrete reinforcing layer, wherein the post-cast strip is provided with a water collecting pit, and the blind ditch extends to the water collecting pit;

4) after binding reinforcing steel bars on two sides of the post-cast strip, arranging folded water-stopping steel plates along construction joints on two sides of the post-cast strip; the middle part of the water stop steel plate is bent to form an angle of 120-135 degrees.

5) Performing chiseling treatment on the upper and lower concrete construction joints of the folded water-stop steel plate, wherein the chiseling rate is not lower than 95%;

6) paving broken stones in the blind ditch to form a water filtering channel, and covering geotextile on the surfaces of the broken stones; and the water filtering channel extends to the water collecting pit;

7) pressing grooves on two sides of the top of the post-cast strip by using PVC pipes, cutting the PVC pipes into half parts, and covering the pressing grooves to form blind ditches; the blind ditch is communicated with an external drainage ditch;

8) covering geotextile above the PVC pipe;

9) and the concrete hidden post-cast strip is made of the compensation shrinkage concrete with the concrete strength grade higher than that of the original component.

Furthermore, the water collecting pit is built by adopting lime-sand bricks, and the inner side of the water collecting pit is plastered and leveled.

Further, the water filtering channels are arranged in a 1% gradient towards the direction of the water collecting pit.

Further, the cross section of the post-cast strip is in a trapezoid shape; the folded water stop steel plates are respectively arranged at construction joints on two sides of the post-cast strip; a plurality of closing-up nets are arranged below the folded water stop steel plate; a plurality of the binding off net is arranged in an inclined manner from bottom to top, and the inclination angle is consistent with that of the bevel edge of the post-pouring belt.

Furthermore, the post-pouring belt comprises a support frame for installing the closing-up net, the support frame is welded along the direction of the inclined edge of the post-pouring belt through short steel bars, and the closing-up nets are obliquely bound on the support frame through iron wires.

Furthermore, the folded water stop steel plate is obliquely arranged along the direction deviating from the post-cast strip.

Furthermore, the two ends of the folded water stop steel plate are respectively fixed by welding a plurality of short steel bars, and the short steel bars are arranged at intervals.

Furthermore, the indent is covered with the PVC pipe that is cut half-and-half, the root of PVC pipe is fixed through the mortar screed.

Further, the compression-resistant grade of the fine aggregate concrete in the step 2) is C20.

Designing a post-casting belt with a trapezoidal section, covering a reinforced concrete reinforcing layer at the bottom of the post-casting belt, arranging a blind ditch above the reinforced concrete reinforcing layer, arranging a water collecting pit at the bottom of the post-casting belt, mounting a folded water stopping steel plate at a construction joint, chiseling the construction joint of the folded water stopping steel plate, paving broken stones in the blind ditch, covering geotextile on the surfaces of the broken stones, pressing the groove by using a PVC pipe to form the blind ditch, covering geotextile on the PVC pipe, and concealing the post-casting belt; through the construction, a 'two-prevention two-row' multiple-restriction post-cast strip is formed, and two waterproof measures, namely a reinforced concrete reinforcing layer and a folded water-stopping steel plate, are adopted, wherein the folded water-stopping steel plate is more convenient for full scabbling of a construction joint of the post-cast strip, the close combination of new and old concrete is facilitated, and the risk of leakage of the construction joint is reduced; secondly, the blind ditch and the press groove form two drainage channels of the post-cast strip, so that water seeped from other parts can be drained to the press groove or the blind ditch nearby, the water is drained into a water collecting pit or an outer wall drainage ditch, and the leakage risk is reduced again.

Drawings

FIG. 1 is a schematic plan view of a post-cast strip provided by the present invention;

FIG. 2 is a schematic perspective view of a sump provided by the present invention;

FIG. 3 is a perspective view of the folded water stop steel plate according to the present invention;

FIG. 4 is a perspective view of the folded water stop steel plate provided by the present invention;

FIG. 5 is a schematic cross-sectional view of a folded water stop steel plate according to the present invention;

FIG. 6 is a schematic plan view of the prefabricated panel provided by the present invention;

FIG. 7 is a schematic cross-sectional view of the prefabricated panel provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1-7, preferred embodiments of the present invention are provided.

The construction method of the multilayer restraint anti-leakage post-cast strip comprises the following construction steps:

1) designing a post-cast strip 10; the cross section of the post-cast strip 10 is trapezoidal; the trapezoidal post-cast strip 10 is convenient for subsequent construction, and the waterproof area of the post-cast strip 10 can be increased;

2) a reinforced concrete reinforcing layer is arranged at the bottom of the post-cast strip 10; the reinforced concrete reinforcing layer comprises a concrete cushion layer 11, a self-adhesive modified asphalt waterproof coiled material 12, a waterproof additional layer 17 and fine aggregate concrete 13;

after the earthwork is dug to the designed elevation, a concrete cushion layer 11 is poured, the concrete cushion layer 11 is a middle layer of a reinforced concrete foundation and foundation soil, the surface of a poured area can be smooth, reinforcing steel bars can be conveniently bound on the surface, and the foundation can be protected; then according to a design drawing, constructing a self-adhesive modified asphalt waterproof coiled material 12 at the bottom of the post-cast strip 10, and arranging a waterproof additional layer 17 for double waterproofing to prevent water seepage at the bottom of the post-cast strip 10; after waterproof construction, steel bars at the bottom of the post-cast strip 10 are bound according to design drawings, a hanging formwork is erected, and fine aggregate concrete 13 is poured to serve as a waterproof protective layer.

The compression rating of the fine stone concrete 13 in this embodiment is C20.

3) The reinforced concrete reinforcing layer is provided with a blind ditch 15, and the blind ditch 15 is an underground drainage channel and can be used for draining underground water; the post-cast strip 10 is provided with a water collecting pit 22, the blind ditch 15 extends to the water collecting pit 22, seeped underground water can flow together to the water collecting pit 22 along the blind ditch 15, and the water collecting pit 22 stores the water so as to avoid the influence on the construction quality caused by the fact that the whole post-cast strip 10 is soaked by the water.

4) Folding water stop steel plates 21 are arranged at construction joints on two sides of the post-cast strip 10;

in a box foundation or a basement, the concrete of the bottom plate and the external wall plate is poured and tamped separately, when the concrete of the wall plate is poured and tamped again next time, a construction joint exists, when the position of the construction joint is below the underground water level line, water seepage is easy to generate, and therefore the construction joint needs to be technically processed, and in the embodiment, the folded water stop steel plate 21 is arranged for processing, and the water seepage of the construction joint is placed.

Installing a folded water stop steel plate 21: welding and fixing two ends of the folded water stop steel plate 21 by using a plurality of short steel bars 23 respectively, wherein the short steel bars 23 are arranged at intervals; in the embodiment, phi 14 short steel bars 23 are used, and the short steel bars 23 are welded one by one in the direction of the oblique side of the post-cast strip 10 along each 1 m; in order to make the concrete of the lower part of the folded water stop steel plate 21 at the construction joint of the post-cast strip 10 capable of being fully chiseled, the folded water stop steel plate 21 is designed, the middle part of the folded water stop steel plate 21 is bent, the bending angle is 120-135 degrees, the folded water stop steel plate 21 is obliquely arranged along the direction deviating from the post-cast strip 10 during installation, the concrete construction joints above and below the folded water stop steel plate 21 are convenient to be fully chiseled, the close combination of new and old concrete is facilitated, and the leakage risk of the construction joints is reduced.

5) The upper and lower concrete construction joints of the folded water-stop steel plate 21 are roughened, and the roughening rate is not lower than 95%;

the function of the scabbling is to ensure that the construction surfaces in the two construction stages are firmly bonded; in a cast-in-place structure, after a cast-in-place slab is poured, roughening is needed to pour the next layer of column wall; the concrete is firmly bonded, the bonding force is enhanced, the new and old concrete can be tightly combined, and the risk of leakage of construction joints is reduced.

6) Paving broken stones in the blind ditch 15 to form a water filtering channel, covering geotextile on the surfaces of the broken stones, and extending the water filtering channel to the water collecting pit 22;

the water level can be reduced by paving the gravels, the water filtering channel is arranged in a certain gradient along the direction of the water collecting pit 22, and the permeated water can flow into the water collecting pit 22 along the water filtering channel.

The geotextile is one of new material geosynthetic materials, the finished product is in a cloth shape, the strength of the geotextile is high, and the geotextile can keep sufficient strength and elongation in a dry and wet state; corrosion resistance, and the coating can resist corrosion for a long time in soil and water with different pH values; the water permeability is good, and gaps are formed among fibers, so that the water seepage performance is good; the antimicrobial property is good, and the product is not damaged by microorganisms and worm damage; and the geotextile is light and flexible in material, so that the geotextile is convenient to transport, lay and construct, can be covered on the broken stones, can ensure that water in the blind ditch 15 can smoothly flow into the water collecting pit 22, can avoid the blind ditch 15 from being blocked, and plays a great role in the construction of the post-cast strip 10.

7) Pressing grooves 18 are formed in the two sides of the top of the post-cast strip 10 through PVC pipes 19; the PVC pipe 19 is cut in half, the PVC pipe 19 is covered on the pressure groove 18, a blind ditch is formed between the PVC pipe 19 and the pressure groove 18, the root of the PVC pipe 19 is fixed through a mortar punching rib 20, and the blind ditch is communicated with an external drainage ditch;

the PVC pipe 19 is a plastic pipe which is developed and applied at the earliest by using a hot-press extrusion method after the polyvinyl chloride resin is matched with a stabilizer, a lubricant and the like, the PVC pipe 19 has strong corrosion resistance, easy adhesion, low price, hard texture and long service life in the post-cast strip 10, and can drain water for the post-cast strip 10 for a long time.

8) The geotextile is covered above the PVC pipe 19, so that the PVC pipe 19 can be protected;

9) the hidden post-cast concrete strip 10 made of the compensation shrinkage concrete with the concrete strength grade higher than that of the original component is used, so that the common quality problems of low strength, easy damage, much rework and the like of the traditional brick masonry wall can be effectively solved, the construction process is simplified, and the construction efficiency is improved.

Designing a post-cast strip 10 with a trapezoidal section, covering a reinforced concrete reinforcing layer at the bottom of the post-cast strip 10, arranging a blind ditch 15 above the reinforced concrete reinforcing layer, arranging a water collecting pit 22 at the bottom of the post-cast strip 10, installing a folded water stop steel plate 21 at a construction joint, roughening the construction joint of the folded water stop steel plate 21, paving broken stones in the blind ditch 15, covering geotextile on the surfaces of the broken stones, pressing a groove 18 by using a PVC pipe 19 to form a blind ditch, covering geotextile on the PVC pipe 19, and concealing the post-cast strip 10; through the construction, the 'two-prevention two-row' multi-layer constrained post-cast strip 10 is formed, and two waterproof measures, namely a reinforced concrete reinforcing layer and a folded water-stop steel plate 21, are adopted, wherein the folded water-stop steel plate 21 is more convenient for fully chiseling the construction joint of the post-cast strip 10, the close combination of new and old concrete is facilitated, and the risk of leakage of the construction joint is reduced; secondly, the blind ditch 15 and the pressure groove 18 form two drainage channels of the post-cast strip 10, water seeped from other parts can be guided into the pressure groove 18 or the blind ditch 15 nearby, the water is drained into the water collecting pit 22 or an outer wall drainage ditch, and the leakage risk is reduced again.

In the step 2), the concrete cushion layer 11, the self-adhesive modified asphalt waterproof roll 12, the waterproof additional layer 17 and the fine aggregate concrete 13 are sequentially covered at the bottom of the post-cast strip 10, and after the covering is finished, reinforcing steel bars can be bound on the bottom plates on two sides of the post-cast strip 10.

The direction that the drainage passageway is towards sump 22 is 1% slope and arranges, can make the water that gathers to french drain 15 flow to sump 22 along the ramp direction of drainage passageway, avoids french drain 15 ponding.

A plurality of closing-up nets 25 are arranged below the folded water stop steel plate 21; the closing-up net 25 is fixed as a consumable template, the closing-up net 25 has good mechanical property and small side pressure, and after concrete pouring, because the closing-up net 25 has a net opening, the pouring engineering is monitored by naked eyes, so that the risk of gaps and honeycombs is reduced, the steel bars are convenient to penetrate and continuously bound, the next time of concrete pouring can be bound without detaching the template or forming seams, the transportation and the installation are also convenient, and great convenience is provided for the construction engineering.

The folded water stop steel plate 21 in the embodiment includes a plate body; the plate body comprises a first panel 210 and a second panel 211, one end of the first panel 210 is connected with one end of the second panel 211, and an angle formed between one end of the first panel 210 and one end of the second panel 211 is smaller than 180 degrees; the cross-section of plate body is the V-arrangement, then when sealing the plate body in the construction, first panel 210 provides the space for construction joint department up with second panel 211, is convenient for chisel hair, makes the construction face bonding firm, does benefit to new and old concrete inseparable combination, reduces the risk of construction joint seepage.

The other end of the first panel 210 is bent downwards to form a first edge 212, and the other end of the second panel 211 is bent downwards to form a second edge 213; the area of the plate body is increased by the first edge body 212 and the second edge body 213, the angle formed between the first edge body 212 and the first panel 210 and the angle formed between the second edge body 213 and the second panel 211 are both larger than 180 degrees, after the plate body is installed, the first edge body 212 and the second edge body 213 extend downwards, and after concrete is poured, the effect of stabilizing the plate body can be achieved, so that the plate body and the concrete are connected into a whole.

The upper and lower surfaces of the first side body 212 and the second side body 213 are both provided with rubber water stops 214, the rubber water stops 214 have good elasticity, wear resistance, aging resistance and tear resistance, strong adaptive deformability and good waterproof performance, and can protect the first side body 212 and the second side body 213 and prevent the first side body 212 and the second side body 213 from being corroded.

The two ends of the plate body are respectively provided with a lower joint 216 and an upper joint 217, so that the folded water stop steel plate 21 is installed in a segmented mode, generally 3 meters or 6 meters, and the upper joint 217 or the lower joint 216 at one end of the plate body is butted with the lower joint 216 or the upper joint 217 at one end of the other plate body when the folded water stop steel plate is installed, so that the convenience in transportation and installation is realized; an upper groove surface is formed by downwards sinking the upper surface of the lower joint 216, and a lower groove surface is formed by upwards sinking the lower surface of the upper joint 217; when the two connectors are in butt joint, the upper groove surface and the lower groove surface are in butt joint, then, the joint between the two connectors is welded, the two connectors are fully welded and are welded in a double-side mode, leakage points cannot occur, the two plate bodies are connected perfectly, and the waterproof performance is prevented from being influenced.

The angle that forms between first panel 210 and the second panel 211 is 120 to 135, if the angle between first panel 210 and the second panel 211 is less than 120, can reduce the waterproof area of plate body, and when the angle between second panel 211 and the first panel 210 is greater than 135, can reduce the water-proof effects of book shape stagnant water steel sheet 21, only when the angle between first panel 210 and the second panel 211 is between 120 to 135, can make book shape stagnant water steel sheet 21 play best water-proof effects.

An angle formed between the first side body 212 and the first panel 210 and an angle formed between the second side body 213 and the first panel 210 are 225 ° to 240 °.

The bottom parts of the first panel 210 and the second panel 211 are respectively provided with a convex mounting seat 215, the mounting seat 215 is bent downwards to form an arc shape, in the embodiment, when the folded water stop steel plate 21 is mounted, firstly, the reinforcing steel bars at the bottom layer of the bottom plate are bound, the support frame 24 for mounting the closing net 25 is welded by phi 14 short reinforcing steel bars 23 along the slope direction of the post-cast strip at intervals of 1m, and the closing net 25 is obliquely bound on the support frame 24 by iron wires; after the closing net 25 at the lower part is fixed, the folded water stop steel plate 21 can be installed, two ends are welded and fixed by a plurality of phi 14 short steel bars 23, and the distance between the short steel bars 23 is 1 m; after the binding of the reinforcing steel bars on the surface layer of the bottom plate is finished, installing the upper closing-in net 25, wherein the installation of the upper closing-in net 25 and the lower closing-in net 25 is consistent with the gradient of the section of the post-cast strip; and when the water stop steel plate is installed and qualified through acceptance, the bottom plate concrete can be poured, and the pouring is ensured to be compact.

A plurality of convex strips are convexly formed on the first panel 210, and each convex strip comprises a flow guide section 218 and a water retaining section 219; the flow guiding section 218 extends towards the second panel 211; the water blocking section 219 extends toward the first side body 212; the direction of water conservancy diversion section 218 towards first side 212 is "eight" font and arranges, and manger plate section 219 is just "eight" font along the direction of first side 212 and arranges, in the post-cast strip construction of this embodiment, the slope installation of fold shape stagnant water steel sheet 21 in post-cast strip 10 construction joint department, water that leaks to fold shape stagnant water steel sheet 21 from upper portion can be with water conservancy diversion along water conservancy diversion section 218, flows away from fold shape stagnant water steel sheet 21, and manger plate section 219 can block outside water and get into fold shape stagnant water steel sheet 21, plays the manger plate effect.

The outer end of the water retaining segment 219 is provided with a support block 220, which plays a certain supporting role for the water retaining segment 219.

In addition, the sump 22 is built by sand-lime bricks, the sand-lime bricks have large capacity and excellent sound insulation performance, and when water is drained to the sump 22, water flow sound can be isolated, so that a comfortable living environment is provided for users.

In the embodiment, after the post-cast strip 10 encloses the concrete, a reinforced concrete precast slab 26 is installed above the post-cast strip 10; firstly, the tongue-and-groove 261 with the width of 100mm and the depth of 45mm needs to be preset on the two sides of the post-cast strip 10 close to the outdoor side; the two flat plates are connected, the edges of the plates respectively form a half-edge through slot, and the upper part and the lower part are spliced together, so that a structure capable of preventing through-seam is a tongue-and-groove 261; therefore, the two reinforced concrete prefabricated panels 26 in this embodiment are connected by one-on-one lap joint; before the shear wall is sealed, bolts are embedded according to design drawings, and M16 bolts are used in the embodiment.

Before the reinforced concrete precast slab 26 is coated at the rabbet 261, 2 thick polyurethane waterproof coating films are coated at the rabbet 261, and the coating extends to the outer edge of the rabbet 261 by 250 mm; the prefabricated plate is fixed by adopting an M16 bolt; considering that the prefabricated slab is easy to be cracked due to settlement or temperature difference deformation of two sides of the post-cast strip 10, and when the prefabricated slab is fixed, the bolt on one side cannot be completely screwed, the reinforced concrete prefabricated slab 26 is used for replacing the traditional brick masonry, the bolt is not completely screwed, and a certain free movement space of the prefabricated slab can be ensured.

Holes 260 are reserved at four corners of the reinforced concrete precast slab 26, the precast slab is connected with the embedded bolts of the shear wall through the holes 260, and the hole 260 reserved in the embodiment is phi 30; the size of the reinforced concrete precast slab 26 is 1m × 0.04m (length × width × thickness); the inner reinforcing steel bars A8@200 are arranged in a single-layer and two-way mode, and C25 concrete is adopted.

After the reinforced concrete precast slab 26 is installed, the outer side is paved with the 3mm self-adhesive modified asphalt waterproof roll 12, and after the installation, a 20-thick extruded polyethylene polystyrene board is used as a waterproof protective layer, and the basement earthwork can be directly backfilled after the completion.

In addition, in the actual field construction process, because the construction progress of the adjacent areas of the post-cast strip 10 cannot be synchronized, the post-cast strip 10 does not have the condition that two sides are erected simultaneously, at the moment, the early dismantling head is sleeved on the top of the adjustable rigid support upright rod or the common steel pipe, and the independent support system is effectively connected with the full-framing support outside the range of the post-cast strip 10 to form a stable whole.

The early-dismantling head is a component used in cooperation with an adjustable steel support, the early-dismantling head in the embodiment adopts a lead screw with the diameter of 38mm and is made of Q235, a detachable supporting plate is arranged at the top of the early-dismantling head, the early-dismantling head is difficult and convenient to assemble as a formwork outside the height of the post-cast strip 10, and a rotary tray and adjusting bolts are arranged in the middle of the early-dismantling head and are used as main edge reinforcing members poured by the post-cast strip 10.

The early-dismantling top plate belt is firstly installed, namely a 400-width template. And installing templates in other areas, and arranging the templates from the edge of the plate band to two sides by using the undiced templates. During form removal, the single-side plate belt of the post-cast strip 10 and the independent support frame 24 are reserved, and other forms and frame bodies are removed; and after the post-cast strip 10 reaches the design required closing time limit, roughening and cleaning the post-cast strip 10, removing rubbish, erecting an intermediate template of the post-cast strip 10 and having low cost.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The construction method of the multilayer restraint anti-leakage post-cast strip is characterized by comprising the following construction steps:

a, pouring the concrete cushion layer;

4) after binding reinforcing steel bars on two sides of the post-cast strip, arranging folded water-stopping steel plates along construction joints on two sides of the post-cast strip; the middle part of the water stop steel plate is bent to form an angle of 120-135 degrees;

8) covering geotextile above the PVC pipe;

9) the concrete hidden post-cast strip is made of the compensation shrinkage concrete with the concrete strength grade higher than that of the original component;

the folded water stop steel plate comprises a plate body; the plate body comprises a first panel and a second panel, one end of the first panel is connected with one end of the second panel, and an angle formed between one end of the first panel and one end of the second panel is smaller than 180 degrees; the section of the plate body is V-shaped;

the other end of the first panel is bent downwards to form a first edge body, and the other end of the second panel is bent downwards to form a second edge body; an angle formed between the first edge body and the first panel, and an angle formed between the second edge body and the second panel are both greater than 180 °; rubber water stop belts are arranged on the upper and lower surfaces of the first side body and the second side body;

the two ends of the plate body respectively form a lower joint and an upper joint, the folded water stop steel plate is installed in sections when being installed, and the upper joint or the lower joint at one end of the plate body is butted with the lower joint or the upper joint at one end of the other plate body when being installed; an upper groove surface is formed by downwards sinking the upper surface of the lower joint, and a lower groove surface is formed by upwards sinking the lower surface of the upper joint; when the two joints are butted, the upper groove surface and the lower groove surface are butted, and then a joint between the two joints is welded, wherein the joint is required to be fully welded and is double-sided welded;

a plurality of convex strips are convexly formed on the first panel, and each convex strip comprises a flow guide section and a water blocking section; the flow guide section extends towards the direction of the second panel; the water blocking section extends towards the direction of the first edge body; the diversion section is arranged in an inverted splayed shape towards the first edge body, and the water blocking section is arranged in a regular splayed shape along the direction of the first edge body; the outer end of the water retaining section is provided with a supporting block.

2. The construction method of the multi-layer restraining anti-leakage post-cast strip as claimed in claim 1, wherein the water collection pit is built by lime-sand bricks, and the inner side of the water collection pit is leveled by plastering.

3. The method for constructing a multi-layer restraining anti-leakage post-cast strip as claimed in claim 2, wherein the drainage channels are arranged with a slope of 1% towards the water collecting pit.

4. The method for constructing a multi-layer restraining leakage-proof post-cast strip as claimed in claim 3, wherein the cross section of the post-cast strip is trapezoidal; the folded water stop steel plates are respectively arranged at construction joints on two sides of the post-cast strip; a plurality of closing-up nets are arranged below the folded water stop steel plate; a plurality of the binding off net is arranged in an inclined manner from bottom to top, and the inclination angle is consistent with that of the bevel edge of the post-pouring belt.

5. The method for constructing a multi-layer restraining leakage-proof post-cast strip as claimed in claim 4, wherein the post-cast strip comprises a support frame for mounting the closing-up nets, the support frame is welded by short steel bars along the direction of the inclined edge of the post-cast strip, and a plurality of closing-up nets are obliquely bound on the support frame by iron wires.

6. The construction method of the multi-layer restraining leakage-proof post-cast strip as claimed in any one of claims 1 to 5, wherein the folded water-stop steel plate is obliquely arranged along a direction away from the post-cast strip.

7. The construction method of the multi-layer restraining anti-leakage post-cast strip as claimed in claim 6, wherein two ends of the folded water-stop steel plate are welded and fixed by a plurality of short steel bars respectively, and the short steel bars are arranged at intervals.

8. The construction method of the multilayer restraint anti-leakage post-cast strip as claimed in any one of claims 1 to 5, wherein the indent is covered with a PVC pipe cut in half, and the root of the PVC pipe is fixed by a mortar screed.

9. The construction method of the multi-layer restraining leakage-proof post-cast strip as claimed in any one of claims 1 to 5, wherein the compression-resistant grade of the fine aggregate concrete in the step 2) is C20.