CN107246148B - Water stopping structure and water stopping process for thin-wall concrete split screw - Google Patents
Water stopping structure and water stopping process for thin-wall concrete split screw Download PDFInfo
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- CN107246148B CN107246148B CN201710443659.8A CN201710443659A CN107246148B CN 107246148 B CN107246148 B CN 107246148B CN 201710443659 A CN201710443659 A CN 201710443659A CN 107246148 B CN107246148 B CN 107246148B
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- reaming section
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/007—Plugs to close openings in forms' surface
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
- E04G17/0655—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts
- E04G17/0657—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts fully recoverable
Abstract
The invention discloses a water stop structure for a thin-wall concrete split screw, which comprises a plastic corrugated pipe arranged in a thin-wall concrete split screw hole; the counter-pulling screw hole in plastic corrugated pipe the place ahead sets up to preceding reaming section, and the counter-pulling screw hole in plastic corrugated pipe rear sets up to back reaming section, and the end of preceding reaming section is equipped with water inflation stagnant water stopper, preceding reaming section, back reaming section and the intraductal equal shutoff grout material of plastic corrugated. The invention also discloses a construction method of the thin-wall concrete split screw water stop structure, which comprises the first step of installing a plastic corrugated pipe sleeve and a split screw; the second step is pouring and form removal; the third step is reaming; the fourth step is to install a water stop plug which expands when meeting water; the fifth step is to fill the grouting material; the sixth step is that if the underground water exists, a water-swelling water stop plug is added on the back water side. The thin-wall concrete split screw water stop structure has high water pressure resistance, high structure tightness and durability and is convenient to construct.
Description
Technical Field
The invention relates to the field of building construction, in particular to a thin-wall concrete split screw water stop structure and a water stop process.
Background
In the concrete engineering construction, a common technical means is to tie the templates inside and outside the wall body by using split bolts (also called split screws or split screws) between the templates on the two sides, and the split screws bear the lateral pressure and other loads of the concrete, so that the rigidity and stability of the templates on the inner side and the outer side can meet the design requirements.
In thin-wall concrete engineering, the prior split screw drawing connection template process in the building market has the following problems: the requirement on the quality of the whole set of the water stopping processing and manufacturing process of the split screw is high, the installation is difficult, and the die is not easy to detach; for thin-wall concrete, the concrete wall is thin, the split screw is short, the seepage path (seepage path refers to the seepage path of water) is short, and the lead screw is easy to leak after being rusted for a long time; because the concrete wall is thin and the reinforcing steel bars are dense, the split screw water-stop steel ring and the expansion ring are easy to damage due to over vibration or leak at the split screw water-stop steel ring when pouring and vibrating.
The method for processing the water stop of the split screw for reinforcing the thin-wall concrete formwork in the current building market is subjected to novelty retrieval and analysis, and the water stop method mainly comprises two types:
the first type is: the split screw part is embedded in the concrete and is stopped by the metal water stop sheet and the expansion ring. Such a water stopping method has an advantage of high resistance to water pressure (in contrast, an increase in water pressure does not easily cause further leakage, but cannot solve the original leakage). The disadvantages are: the construction difficulty is big, the progress is slow, construction cost is high, the durability is poor, easily produce the seepage because of the structure reason etc..
The second type: the plastic sleeve is embedded in advance, the split screws can be drawn out for turnover, and the wire drawing holes are sealed by water-swelling water-stopping putty and swelling mortar. The split screw has the advantages that the split screw can be used in a turnover way, and the construction cost is low; the water-swellable putty has the advantages of corrosion resistance, aging resistance and good durability; the installation is convenient; the formwork stripping period is short, the turnover rate of the formwork can be improved, and the construction progress can be accelerated. The disadvantage is that the water pressure resistant strength is small, and the leakage is easy to be caused by the water pressure.
Disclosure of Invention
The invention aims to provide a thin-wall concrete split screw water stop structure which has high water pressure leakage resistance, high structural tightness and high durability and is convenient to construct.
In order to achieve the purpose, the thin-wall concrete split screw water stop structure comprises a plastic corrugated pipe arranged in a thin-wall concrete split screw hole; taking the upstream face as the front direction, setting a counter-pulling screw hole in front of the plastic corrugated pipe as a front reaming section, wherein the diameter of the front reaming section is larger than that of the plastic corrugated pipe, the rear end part of the front reaming section is provided with a front shrinkage hole section with a large front part and a small rear part, and the diameter of the rear end of the front shrinkage hole section is the same as the outer diameter of the plastic corrugated pipe and is correspondingly communicated with the plastic corrugated pipe;
the counter-pulling screw hole behind the plastic corrugated pipe is arranged as a rear reaming section, the diameter of the rear reaming section is larger than that of the plastic corrugated pipe, and the front end part of the rear reaming section is provided with a rear shrinkage hole section which is small in front and large in rear;
the tail end of the front reaming section is provided with a water-swelling water stop plug which is matched with the tail end of the front reaming section and the front shrinkage hole section; the grout material is plugged in the front reaming section in front of the water swelling water stop plug, and the grout material is plugged in the plastic corrugated pipe behind the water swelling water stop plug and in the rear reaming section.
The diameter of the front end of the water swelling stop plug is the same as the inner diameter of the front reaming section, and the diameter of the rear end of the water swelling stop plug is smaller than the inner diameter of the plastic corrugated pipe and extends into the plastic corrugated pipe.
Meet the long 20 millimeters of water inflation sealing plug, meet water inflation sealing plug rear end diameter and be 16 millimeters, meet the well anterior diameter of water inflation sealing plug and be 22 millimeters, the internal diameter of preceding reaming section and back reaming section is 22 millimeters, and preceding reaming section is long 100 millimeters, and back reaming section is long 20 millimeters.
The invention also discloses a construction process of the thin-wall concrete split screw water stop structure, which is sequentially carried out according to the following steps:
the first step is to penetrate a plastic corrugated pipe and a split screw between the front and the rear side templates;
firstly, penetrating a counter-pull screw into a hard plastic corrugated pipe, and then penetrating the plastic corrugated pipe and the counter-pull screw into template holes of front and rear templates; the length of the plastic corrugated pipe is 20 mm greater than the thickness of the concrete section; the inner diameter of the plastic corrugated pipe is 2-4 mm larger than the diameter of the screw;
the second step is to pour thin-wall concrete and remove the form,
after the templates are qualified, pouring concrete by using a conventional method, maintaining the concrete to a preset template removal strength, then drawing out a split screw from the plastic corrugated pipe, and then removing the front side template and the rear side template;
a third step of reaming, namely reaming the counter-pulling screw hole on the upstream surface, namely the front end surface of the poured thin-wall concrete structure by using an electric hand drill to increase the aperture of the counter-pulling screw hole by 4 mm, and processing a front reaming section and a front shrinkage hole section;
reaming the counter-pulling screw hole on the back surface of the poured thin-wall concrete by using an electric hand drill to increase the aperture of the counter-pulling screw hole by 4 mm, and processing a rear reaming section and a rear shrinkage hole section;
the fourth step is to install a water stop plug which expands when meeting water;
an operator checks the quality of the water-swelling water stop plug made of the water-swelling water stop strip and checks the quality of the front reaming section and the front shrinkage hole section of the front reaming section, and the water-swelling water stop plug is driven into the front reaming section and the front shrinkage hole section by a hand hammer and a flat-head plain steel bar from the upstream face and is tightly plugged, so that the rear end part of the water-swelling water stop plug is attached to the front shrinkage hole section, and the rear end of the water-swelling water stop plug enters the front end of the plastic corrugated pipe; the diameter of the flat smooth round steel bar is 2 mm smaller than that of the front reaming section;
the fifth step is to fill the grouting material;
adding water to mix grouting material, controlling the water cement ratio to be less than 0.2, injecting the grouting material into the front reaming section, the rear shrinkage cavity section and the plastic corrugated pipe, using flat-head plain steel bars with the diameter less than 2 mm of the front reaming section to fill from front to back, compacting the grouting material in the front reaming section, using flat-head plain steel bars with the diameter less than 2 mm of the rear reaming section to fill from back to front, compacting the grouting material in the rear reaming section, the rear shrinkage cavity section and the plastic corrugated pipe, trowelling the grouting material from the front end of the front reaming section and the rear end of the rear reaming section, and finally respectively sticking transparent adhesive tapes at the front end of the front reaming section and the rear end of the rear reaming section for maintenance.
The diameter of the counter-pulling screw in the first step is 12-14 mm, and in the first step, the plastic corrugated pipe extends forwards into the front side template by 10 mm and extends backwards into the rear side template by 10 mm; the inner diameter of the plastic corrugated pipe in the first step is 16 mm and the outer diameter is 18 mm;
the length of the water-swelling water stop plug in the second step is 20 mm, the diameter of the rear end of the water-swelling water stop plug is 16 mm, and the diameter of the front middle front part of the water-swelling water stop plug is 22 mm.
The invention has the following advantages:
the thin-wall concrete split screw water stop structure has the water pressure resistance of over 0.1MPa, has higher structural tightness and durability, and is convenient to construct. Because the water stopping structure is only added with the water-swelling water stopping plug and the grouting material on the basis of the original material for pouring the thin-wall concrete, the cost is very low.
The front reaming section is arranged, and the plastic corrugated pipe of the front reaming section is removed, so that the grouting material can be better combined with concrete, and the stability of a water stop structure is improved; because the diameter of the water-swelling water stop plug is larger than that of the plastic corrugated pipe, a step-shaped structure (front shrinkage hole section) is formed between the front reaming section and the plastic corrugated pipe, the front shrinkage hole section not only changes the permeation direction and improves the anti-permeation strength, but also can utilize the water pressure transmitted from the upstream face to enable the permeation channel to be more and more compact after the water-swelling water stop plug displaces backwards, and improve the anti-permeation strength. If the front reaming section is not available, the water-swelling stop plug has no anti-thrust measure, and the grouting material and the water-swelling stop plug slide backwards under the action of water pressure transmitted from the upstream face so as to damage the anti-seepage structure.
The invention adopts the plastic corrugated pipe, the outer wall of the plastic corrugated pipe forms a corrugated shape after the concrete is poured, and the outer wall of the plastic corrugated pipe also forms a corrugated shape after the grouting material is blocked. Compared with the prior art that no plastic corrugated pipe is arranged or a smooth PVC pipe is adopted, the grouting material is firmly meshed with the thin-wall concrete through the plastic corrugated pipe to form a self-locking structure, so that the capability of resisting the water pressure of the upstream face is improved, and the structure in the counter-pulling screw hole is prevented from moving to the back water face under the action of the water pressure; due to the corrugated shape of the plastic corrugated pipe, the seepage diameter is prolonged, and the anti-seepage capability of the thin-wall concrete split screw water stop structure is further improved.
The invention adopts the grouting material as the finished product plugging material, thereby avoiding the artificial operation error of the mix proportion and ensuring the plugging quality of the split screw hole; due to the micro-expansion characteristic of the grouting material, the plugging material and the concrete are better combined together, and the anti-permeability strength of the split screw hole is improved; due to the high-strength characteristic (generally more than 50 MPa) of the grouting material, the strength of plugging the split screw hole is improved, and the durability and the stability of the thin-wall concrete split screw water stop structure are ensured.
The invention adopts the flat-end plain round steel bar with the diameter of 20 mm, so that the flat-end plain round steel bar can ensure that the flat-end plain round steel bar has larger contact area with the water-swelling stop plug and the water-swelling stop plug is integrally driven into the front reaming section.
The construction process disclosed by the invention is simple and convenient to operate, high-cost equipment or materials are not needed, the thin-wall concrete split screw water-stopping structure can be efficiently manufactured, and the construction quality, the structural strength and the impermeability of the thin-wall concrete split screw water-stopping structure are ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a schematic view of the structure after the counter-pulling screw hole is reamed;
FIG. 4 is a schematic view of a structure after counter-screwing holes are reamed in the presence of groundwater;
FIG. 5 is a schematic structural view of the present invention with water on both sides of the thin wall concrete.
Detailed Description
As shown in fig. 1 to 5, the water stop structure for the thin-wall concrete split screw of the present invention includes a plastic corrugated pipe 1 disposed in a thin-wall concrete split screw hole; plastic bellows are known in the art and their specific corrugated shape is not shown in detail.
Taking the upstream face as the front direction, setting a counter-pulling screw hole in front of the plastic corrugated pipe 1 as a front reaming section 4, wherein the diameter of the front reaming section 4 is larger than that of the plastic corrugated pipe 1, the rear end part of the front reaming section 4 is provided with a front shrinkage hole section 5 with a large front part and a small rear part, and the diameter of the rear end of the front shrinkage hole section 5 is the same as the outer diameter of the plastic corrugated pipe 1 and is correspondingly communicated with the plastic corrugated pipe 1; of course, the outer diameter of the plastic bellows 1 is the same as the inner diameter of the counter-screw hole.
A counter-pulling screw hole at the rear of the plastic corrugated pipe 1 is arranged as a rear reaming section 6, the diameter of the rear reaming section 6 is larger than that of the plastic corrugated pipe 1, and a rear shrinkage hole section 7 with a small front part and a large rear part is arranged at the front end part of the rear reaming section 6;
the tail end of the front reaming section 4 is provided with a water-swelling water stop plug 8, and the water-swelling water stop plug 8 is matched with the tail end of the front reaming section 4 and the front shrinkage hole section 5 thereof; the grouting material 9 with the water cement ratio smaller than 0.2 is plugged in the front reaming section 4 in front of the water swelling water stop plug 8, and the grouting material 9 with the water cement ratio smaller than 0.2 is plugged in the plastic corrugated pipe 1 behind the water swelling water stop plug 8 and in the rear reaming section 6.
Wherein, the water-swelling stop plug 8 is made of water-swelling material, such as a water-swelling stop strip (circular shape) when meeting water.
The diameter of the front end of the water swelling water stop plug 8 is the same as the inner diameter of the front reaming section 4, and the diameter of the rear end of the water swelling water stop plug 8 is smaller than the inner diameter of the plastic corrugated pipe 1 and extends into the plastic corrugated pipe 1.
Meet the long 20 millimeters of water inflation sealing plug 8, meet water inflation sealing plug 8 rear end diameter and be 16 millimeters, meet the well anterior diameter of water inflation sealing plug 8 and be 22 millimeters, preceding reaming section 4 is 22 millimeters with the internal diameter of back reaming section 6, preceding reaming section 4 is long 100 millimeters, and back reaming section 6 is long 20 millimeters.
Fig. 5 is a schematic structural view of the present invention when water is present on both sides of the thin-walled concrete.
The invention also discloses a construction process of the thin-wall concrete split screw water stop structure, which is sequentially carried out according to the following steps:
the first step is that a plastic corrugated pipe 1 and a split screw are inserted between a front side template and a rear side template;
firstly, opposite-pulling screws penetrate into the hard plastic corrugated pipe 1, and then the plastic corrugated pipe 1 and the opposite-pulling screws penetrate into template holes of the front and rear templates; the templates using the tie of the split screws are all provided with template holes for penetrating the split screws, and the templates and the template holes are not shown in the figure for the prior art. The length of the plastic corrugated pipe is 20 mm greater than the thickness of the concrete section; the front end of the plastic corrugated pipe 1 penetrates into the front template and the rear end thereof penetrates into the rear template, thereby preventing slurry leakage at the template hole during concrete pouring; the inner diameter of the plastic corrugated pipe 1 is 2-4 mm larger than the diameter of the screw;
the second step is to pour thin-wall concrete and remove the form,
after the templates are qualified, pouring concrete between the front and rear templates by using a conventional method, maintaining the concrete to a preset template removal strength, then drawing out a split screw from the plastic corrugated pipe 1, and then removing the front side template and the rear side template;
a third step is reaming, namely reaming the counter-pulling screw hole on the upstream surface, namely the front end surface of the poured thin-wall concrete structure by using an electric hand drill, so that the aperture of the counter-pulling screw hole is increased by 4 mm to 22 mm, the reaming depth at the position is 100 mm, and a front reaming section 4 and a front shrinkage hole section 5 thereof are naturally processed by depending on the shape of a drill bit during drilling;
reaming the counter-pulling screw hole on the back water surface of the poured thin-wall concrete structure by using an electric hand drill to increase the aperture of the counter-pulling screw hole by 4-22 mm, wherein the reaming depth is 20 mm, and a rear reaming section 6 and a rear shrinkage hole section 7 are naturally processed by the drill bit according to the shape of the drill bit during drilling;
the fourth step is to install a water-swelling stop plug 8;
an operator checks the quality of the water-swelling stop plug 8 made of the water-swelling stop strip with a circular cross section and checks the quality of the front reaming section 4 and the front shrinkage hole section 5 thereof, and the water-swelling stop plug 8 is driven into the front reaming section 4 and the front shrinkage hole section 5 thereof by a hand hammer and a flat-head plain steel bar from the upstream face (i.e., from front to back) and is tightly plugged, so that the rear end part of the water-swelling stop plug 8 is attached to the front shrinkage hole section 5 and the rear end of the water-swelling stop plug 8 enters the front end of the plastic corrugated pipe 1; the diameter of the flat smooth round steel bar is 2 mm smaller than that of the front reaming section 4 and is 20 mm. Therefore, the large contact area between the flat-end smooth round steel bar and the water-swelling water stop plug 8 can be ensured, the water-swelling water stop plug 8 is integrally driven into the front reaming section 4, the situation that the flat-end smooth round steel bar is in contact with the front reaming section 4 to cause the hole wall of the front reaming section 4 to be damaged can be prevented, and water leakage caused by the damage of the front reaming section 4 can be prevented;
the fifth step is to fill the grouting material 9;
adding water to mix grouting material 9, controlling the water cement ratio to be less than 0.2, injecting the grouting material 9 into the front reaming section 4, the rear reaming section 6, the rear shrinkage cavity section 7 of the front reaming section and the plastic corrugated pipe 1, using flat-head smooth round steel bars (the diameter of the flat-head smooth round steel bars is 20 mm) with the diameter smaller than the diameter of the front reaming section 4 to plug and compact the grouting material 9 in the front reaming section 4 from front to back (from outside to inside), using flat-head smooth round steel bars with the diameter smaller than the diameter of the rear reaming section 6 to plug and compact the rear reaming section 6, the rear shrinkage cavity section 7 of the rear reaming section 6 and the grouting material 9 in the plastic corrugated pipe 1 from back to front, using a trowel to trowel the grouting material 9 from the front end of the front reaming section 4 and the rear end of the rear reaming section 6, and finally respectively sticking transparent adhesive tapes to the front end of the front reaming section 4 and the rear end of the rear reaming section 6 for maintenance.
Above scheme background is one-way waterproof construction when no groundwater, and the side of following a river meets ground water and needs to carry out two-way waterproof. The specific method is that the depth of the rear reaming section is changed to 40 mm, then a water-swelling water stop plug is driven into the rear reaming section from the back water side for 20 mm, and finally grouting material is used for plugging.
The diameter of the counter-pulling screw in the first step is 12-14 mm, preferably 14 mm, and the plastic corrugated pipe 1 in the first step extends forwards into the front side formwork by 10 mm and backwards into the rear side formwork by 10 mm; in the first step, the inner diameter of the plastic corrugated pipe 1 is 16 mm and the outer diameter is 18 mm;
the diameter of the water-swelling water stop plug 8 at the rear end is 16 mm, and the diameter of the front middle front part is 22 mm;
in the past, pre-buried plastic sleeves, water-stopping putty and expansion mortar are used as a water-stopping structure, and the maximum water pressure resistance strength is 0.05 MPa after 72-hour observation, so that the engineering requirement cannot be met.
After the water stopping structure and the water stopping method of the present embodiment were adopted, the inventors conducted a water pressure resistance test (water column method). Impervious simulation experiment of split screw hole: a group of concrete impermeability test molds is 6, and holes are drilled at the bottom. The upper surface is used as a water-facing surface, the bottom surface is used as a water-backing surface, and a test is carried out by simulating a thin-wall concrete split screw water stop process. The water seepage test method comprises the steps of vertically installing a plastic corrugated pipe and a split screw in the center of a test mold, installing C30W6 concrete, removing the mold, expanding a hole, installing a water swelling water stop plug, plugging grouting material, performing laboratory impermeability test and the like, wherein water seepage is started on the backwater side in 15 hours, and the water seepage is continuously observed and pressurized, and after 40 hours, because the water swelling water stop plug 8 swells and extrudes, the water seepage stops, the pressurization is continuously carried out to 0.8MPa, no water seepage occurs, and the impermeability grade is greater than W6.
And (3) field test: sampling 6 split screw holes, adjusting the height of a water column to 8.5 m (0.085 MPa), and observing that the water seepage starts from the back water side of the thin-wall concrete structure after 20 hours. After 41 hours, the water-swelling stopper 8 swells and squeezes, and the water permeation stops. After 56 hours no wet staining occurred. The height of the water column is adjusted to 10 meters (0.1 MPa), and no wet stain appears after 72 hours of observation, which shows that the water pressure resistance of the water stopping structure and the water stopping process of the invention reaches 0.1 MPa.
The invention is provided with the front reaming section, so the diameter of the water-swelling water stop plug is larger than that of the plastic corrugated pipe, a step-shaped structure (front shrinkage hole section) is formed between the front reaming section and the plastic corrugated pipe, the water-swelling water stop plug can be directly supported from back to front by utilizing a poured thin-wall concrete structure, and the grouting material and the water-swelling water stop plug are prevented from sliding backwards under the action of pressure transmitted from the upstream surface so as to damage the water seepage prevention performance. If there is no front reaming section, the water-swelling plug cannot directly support the water-swelling plug in the front-rear direction.
The invention adopts the plastic corrugated pipe, and the pouring material of the thin-wall concrete enters the outer wall corrugation of the plastic corrugated pipe, so that the plastic corrugated pipe and the thin-wall concrete material are firmly combined together. In the same way, the inner wall of the plastic corrugated pipe is firmly combined with the grouting material. Compared with the prior art that no plastic corrugated pipe is arranged or a light pipe is adopted, the grouting material is firmly combined with the thin-wall concrete through the plastic corrugated pipe, the structural strength is better, the water pressure of the upstream face can be resisted, and the structure in the counter-pull screw hole is prevented from moving to the back water face under the action of the water pressure.
The construction process disclosed by the invention is simple and convenient to operate, high-cost equipment or materials are not needed, the thin-wall concrete split screw water-stopping structure can be efficiently manufactured, and the construction quality, the structural strength and the water seepage resistance of the thin-wall concrete split screw water-stopping structure are ensured.
The diameter of crew cut smooth round steel bar is less than 2 millimeters of the diameter of preceding reaming section, both can guarantee that crew cut smooth round steel bar has great area of contact with water inflation sealing plug, guarantee to squeeze into preceding reaming section with water inflation sealing plug is whole, can prevent again that crew cut smooth round steel bar and preceding reaming section contact, lead to the situation that the pore wall of preceding reaming section is damaged, prevent that preceding reaming section is damaged and arouse the infiltration.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. Thin wall concrete split screw stagnant water structure, its characterized in that:
the plastic corrugated pipe is arranged in a thin-wall concrete counter-pulling screw hole; taking the upstream face as the front direction, setting a counter-pulling screw hole in front of the plastic corrugated pipe as a front reaming section, wherein the diameter of the front reaming section is larger than that of the plastic corrugated pipe, the rear end part of the front reaming section is provided with a front shrinkage hole section with a large front part and a small rear part, and the diameter of the rear end of the front shrinkage hole section is the same as the outer diameter of the plastic corrugated pipe and is correspondingly communicated with the plastic corrugated pipe; the plastic corrugated pipe extends along the front-back direction;
the counter-pulling screw hole behind the plastic corrugated pipe is arranged as a rear reaming section, the diameter of the rear reaming section is larger than that of the plastic corrugated pipe, and the front end part of the rear reaming section is provided with a rear shrinkage hole section which is small in front and large in rear;
the tail end of the front reaming section is provided with a water-swelling water stop plug which is matched with the tail end of the front reaming section and the front shrinkage hole section; the grout material is plugged in the front reaming section in front of the water swelling water stop plug, and the grout material is plugged in the plastic corrugated pipe behind the water swelling water stop plug and in the rear reaming section.
2. The thin-walled concrete counter-pulling screw water stop structure according to claim 1, characterized in that: the diameter of the front end of the water swelling stop plug is the same as the inner diameter of the front reaming section, and the diameter of the rear end of the water swelling stop plug is smaller than the inner diameter of the plastic corrugated pipe and extends into the plastic corrugated pipe.
3. The thin-walled concrete counter-pulling screw water stop structure according to claim 1, characterized in that: meet the long 20 millimeters of water inflation sealing plug, meet water inflation sealing plug rear end diameter and be 16 millimeters, meet the anterior diameter of well of water inflation sealing plug and be 22 millimeters, the internal diameter of preceding reaming section and back reaming section is 22 millimeters, and preceding reaming section is long 100 millimeters, and the long 20 millimeters of back reaming section.
4. The construction process of the thin-wall concrete split screw water stop structure as claimed in claim 1 is characterized by comprising the following steps in sequence:
the first step is to penetrate a plastic corrugated pipe and a split screw between the front and the rear side templates;
firstly, penetrating a counter-pull screw into a hard plastic corrugated pipe, and then penetrating the plastic corrugated pipe and the counter-pull screw into template holes of front and rear templates; the length of the plastic corrugated pipe is 20 mm greater than the thickness of the concrete section; the inner diameter of the plastic corrugated pipe is 2-4 mm larger than the diameter of the screw;
the second step is to pour thin-wall concrete and remove the form,
after the templates are qualified, pouring concrete by using a conventional method, maintaining the concrete to a preset template removal strength, then drawing out a split screw from the plastic corrugated pipe, and then removing the front side template and the rear side template;
a third step of reaming, namely reaming the counter-pulling screw hole on the upstream surface, namely the front end surface of the poured thin-wall concrete structure by using an electric hand drill to increase the aperture of the counter-pulling screw hole by 4 mm, and processing a front reaming section and a front shrinkage hole section;
reaming the counter-pulling screw hole on the back surface of the poured thin-wall concrete by using an electric hand drill to increase the aperture of the counter-pulling screw hole by 4 mm, and processing a rear reaming section and a rear shrinkage hole section;
the fourth step is to install a water stop plug which expands when meeting water;
an operator checks the quality of the water-swelling water stop plug made of the water-swelling water stop strip and checks the quality of the front reaming section and the front shrinkage hole section of the front reaming section, and the water-swelling water stop plug is driven into the front reaming section and the front shrinkage hole section by a hand hammer and a flat-head plain steel bar from the upstream face and is tightly plugged, so that the rear end part of the water-swelling water stop plug is attached to the front shrinkage hole section, and the rear end of the water-swelling water stop plug enters the front end of the plastic corrugated pipe; the diameter of the flat-head plain round steel bar is 2 mm smaller than that of the front reaming section;
the fifth step is to fill the grouting material;
adding water to mix grouting material, controlling the water cement ratio to be less than 0.2, injecting the grouting material into the front reaming section, the rear shrinkage cavity section and the plastic corrugated pipe, using flat-head plain steel bars with the diameter less than 2 mm of the front reaming section to fill from front to back, compacting the grouting material in the front reaming section, using flat-head plain steel bars with the diameter less than 2 mm of the rear reaming section to fill from back to front, compacting the grouting material in the rear reaming section, the rear shrinkage cavity section and the plastic corrugated pipe, trowelling the grouting material from the front end of the front reaming section and the rear end of the rear reaming section, and finally respectively sticking transparent adhesive tapes at the front end of the front reaming section and the rear end of the rear reaming section for maintenance.
5. The construction process according to claim 4, wherein: the diameter of the counter-pulling screw in the first step is 12-14 mm, and in the first step, the plastic corrugated pipe extends forwards into the front side template by 10 mm and extends backwards into the rear side template by 10 mm; the inner diameter of the plastic corrugated pipe in the first step is 16 mm and the outer diameter is 18 mm;
the length of the water-swelling water stop plug in the second step is 20 mm, the diameter of the rear end of the water-swelling water stop plug is 16 mm, and the diameter of the front middle front part of the water-swelling water stop plug is 22 mm.
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| CN203296383U (en) * | 2013-05-24 | 2013-11-20 | 中国华冶科工集团有限公司 | Plugging rod for split bolt holes |
| CN103711205A (en) * | 2014-01-13 | 2014-04-09 | 任斌向 | Waterproof wall split bolt hole plugging structure and construction method thereof |
| CN105568928B (en) * | 2015-12-30 | 2017-07-28 | 中国电建集团北京勘测设计研究院有限公司 | A kind of construction method of compound geomembrane facing slab dam sealing seam |
| CN106639313B (en) * | 2017-02-21 | 2019-08-27 | 宏源防水科技集团有限公司 | A kind of rubber water-proof plug and underground external wall template split bolt hole block water stop construction method |
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