CN115070921A - Forming method and forming device for protective layer of prestressed steel cylinder concrete pipe - Google Patents

Abstract

The invention belongs to the technical field of prestressed concrete cylinder tubes, and in particular relates to a forming method and a forming device for a protective layer of a prestressed concrete cylinder tube. It is installed in the mold to form an annular space between the die and the mold, and also includes a grouting step of injecting mortar into the annular space; before grouting, the top of the annular space is closed, and the closed annular space is pumped. Vacuum operation and inject mortar into the annular space by means of grouting equipment. The forming device of the protective layer of the prestressed steel cylinder concrete tube includes a sealing top cover, the sealing top cover is an annular structure, and the radial inner side of the sealing top cover is provided with a sealing structure for sealing and assembling with the outer wall surface of the tube core to close the top of the annular interval. Note The slurry mold is provided with a grouting port for communicating with the grouting equipment, and the sealing top cover is provided with an air suction port for communicating with the vacuuming equipment.

Description

Forming method and forming device for protective layer of prestressed steel cylinder concrete pipe

technical field

The invention belongs to the technical field of prestressed concrete cylinder tubes, and particularly relates to a forming method and a forming device for a protective layer of a prestressed concrete cylinder tube.

Background technique

Prestressed steel cylinder concrete pipe (abbreviated as pccp) is a pipe made by winding a prestressed steel wire on a concrete pipe core with a steel cylinder, and spraying a mortar protective layer on the circumference of the pipe core. It has the advantages of wide application range, economy, long life, good seismic performance, convenient installation, low operating cost, etc. It is widely used in large-scale water diversion, urban water supply, power plant supplementary water and other projects. The manufacture of the prestressed steel cylinder concrete pipe includes four steps: the manufacture of the steel cylinder, the forming of the tube core, the winding of the hoop prestressed steel wire, and the manufacture of the mortar protective layer.

At present, the production of the mortar protective layer mainly adopts the roller shooting process, that is, the tube core wrapped with steel wire is placed vertically on a rotating platform, so that the tube core rotates, and the dry and hard mortar that is evenly mixed according to the ratio is fed into a pair of In the high-speed rotating roller surface with teeth engaged, the roller is located on the side of the tube core, and can move up and down along the radial direction of the tube core, so that it can spray the mortar on the surface of the tube core at high speed to form dense mortar The protective layer. In order to enhance the anti-corrosion performance of the pipe, the anti-corrosion coating will be dipped on the prestressed steel wire and then wrapped around the pipe core. However, since the dry-hard mortar is rolled onto the surface of the pipe core at high speed, the rolling mortar will damage the prestressed steel. The dip coating of the steel wire may even break the prestressed steel wire. And the outer peripheral surface of the protective layer formed by roller shooting is not flat. For the tube core that needs double-layer winding, it is necessary to scrape the protective layer after the first pass of the protective layer, and the flatness accuracy of the protective layer after scraping. If it is not high, the stress loss of the wire wrapping is relatively large during the second wire wrapping.

Patent document CN113894924A in the prior art discloses a PCCP pipeline ultra-high performance concrete protective layer, pouring equipment and pouring method. The pouring equipment in this patent includes a bottom mold, an outer mold and a feeder. There are three steps of slurrying and hardening. The specific operation is to vertically install the tube core on the bottom mold, so that there is an annular space between the outer mold and the outer wall of the tube core, and install a distributor on the top of the tube core. The upper feeder injects the mortar into the annular space through the distributor. After the injection is completed, the outer side of the tube core is covered with a steam curing cover for steam curing, so that the mortar protective layer is hardened and formed.

Although the use of grouting to form the protective layer can prevent the dry and hard mortar from injuring or breaking the dip-coated anti-corrosion layer of the prestressed steel wire, and because it is formed by a mold, the outer peripheral surface of the formed protective layer is relatively flat, which can reduce the two Stress loss during secondary winding. However, the thickness of the protective layer is currently between 25mm and 30mm, and the thickness is small, so the annular space between the outer mold and the tube core is correspondingly small. It affects the work efficiency, and the air in the annular interval may cause the injected mortar to create a blank area, and the formed protective layer is not dense enough, which affects the overall quality of the prestressed concrete cylinder tube.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for forming the protective layer of a prestressed concrete cylinder tube, so as to solve the technical problems of low forming efficiency and low forming quality of the protective layer of the prestressed concrete cylinder tube in the prior art. The invention also provides a forming device for the protective layer of the prestressed concrete cylinder tube, so as to solve the technical problems of low forming efficiency and low forming quality of the protective layer of the prestressed concrete cylinder tube in the prior art.

In order to achieve the above-mentioned purpose, the technical scheme of the forming method of the protective layer of the prestressed concrete cylinder pipe provided by the present invention is: In the mold, the molding step of forming an annular space between the tube core and the mold also includes a grouting step of injecting mortar into the annular space; before grouting, the top of the annular space is closed, and the closed annular space is vacuumed. , and inject mortar into the annular space through grouting equipment.

The beneficial effects are as follows: the method for forming the protective layer of the prestressed concrete cylinder tube provided by the present invention closes the top of the annular space formed between the tube core and the mold, and evacuates the annular space before grouting, so as to reduce the intermediate space in the annular space. It can prevent the mortar from being blocked by the air in the gap when moving in the annular interval, which not only facilitates the movement of the mortar, but also avoids air filling the space of the mortar, so that the mortar in the annular interval is more compact, which is beneficial to improve the quality of the prestressed concrete pipe. Compared with grouting into the annular space by the distributor in the prior art, the grouting time is reduced, the mortar compactness is increased, and the work efficiency is improved.

As a further improvement, the vacuuming operation is continued until the grouting is completed.

The beneficial effect is that there is air in the mortar, and when the mortar is injected into the annular space, the air will be continuously injected into the annular space, and the continuous vacuuming operation can prevent the air brought into the annular space by the mortar from accumulating in the annular space and affecting the injection of the mortar.

As a further improvement, during grouting, the mortar enters the annular space from the top of the annular space.

The beneficial effect is that the mortar enters the annular space from the top of the annular space, and can descend by its own weight, thereby improving the compactness of the mortar.

As a further improvement, the method for forming the protective layer of the prestressed concrete cylinder tube further includes a hardening step of covering the tube core with a steam curing cover to perform steam curing on the mortar in the annular space so as to harden and form the mortar in the annular space , open the top of the annular spacer as it hardens.

The beneficial effect is that the top of the annular space is opened, so that the tube core can be more exposed to the hot steam, and the hardening efficiency is improved.

The technical scheme of the forming device for the protective layer of the prestressed concrete cylinder pipe provided by the present invention is: the forming device for the protective layer of the prestressed concrete cylinder pipe includes a grouting mold, and the grouting mold includes an outer mold and a base, and the base is used for For the vertical installation of the tube core, the outer mold is used to be installed on the radial outer side of the tube core to form an annular space with the outer wall of the tube core. The top of the outer mold is provided with a sealing top cover, which is an annular structure. The radial inner side is provided with a sealing structure for sealing and assembling with the outer wall surface of the tube core to close the top of the annular space. The exhaust port to which the device is connected.

The beneficial effects are: in the forming device for the protective layer of the prestressed concrete cylinder tube provided by the present invention, the sealing top cover closes the top of the annular space formed between the tube core and the mold, and the annular space is pumped by vacuuming equipment before grouting. Vacuum, reduce the air in the annular interval, avoid the mortar being blocked by the air in the gap when the annular interval moves, which not only facilitates the movement of the mortar, but also prevents the air from filling the space of the mortar, making the mortar in the annular interval more compact, which is conducive to improving the pre- Compared with the prior art, the quality of the stress concrete pipe reduces the grouting time, increases the density of the mortar, and improves the working efficiency compared with the grouting into the annular space by the distributor.

As a further improvement, a sealing groove is provided on the radial inner side of the sealing top cover, and an inflatable rubber ring is arranged in the sealing groove. The socket is sealed.

The beneficial effects are as follows: the inflatable rubber ring is used as a sealing structure, inflated to achieve effective sealing between the sealing top cover and the tube core, and deflated to allow the sealing groove to be opened, so as to facilitate the removal of the sealing top cover.

As a further improvement, the sealing top cover is detachably connected to the outer mold.

The beneficial effects are: the sealing top cover can be detachably connected to the outer mold, which is convenient for manufacture.

As a further improvement, the outer peripheral surface of the outer mold is provided with a butt seam for shrinking and expanding the outer mold in the circumferential direction, and both sides of the butt seam are provided with butt joints for holding the outer mold tightly on the base.

The beneficial effects are: a butt seam is arranged on the outer mold, which is convenient for installation.

As a further improvement, the grouting port is arranged on the sealing top cover.

The beneficial effects are as follows: the grouting port is arranged on the top cover, and the mortar enters the annular space from the top of the annular space, which can descend by its own weight and improve the compactness of the mortar.

As a further improvement, a waste slurry drum is connected to the grouting port and/or the air suction port.

The beneficial effect is that the waste pulp drum can collect the mortar overflowing after filling the annular space and clean the waste pulp produced.

Description of drawings

Fig. 1 is the structural representation of the forming device of the protective layer of the prestressed concrete cylinder pipe provided by the present invention;

FIG. 2 is an assembly diagram of the die and the injection mold.

Description of reference numerals: 1. Mortar mixer; 2. Grouting machine; 3. First grouting valve; 4. Grouting pressure gauge; 5. First waste slurry cylinder; 6. Base; 7. Outer mold; 8. Outer mold lifting lug; 9. Flange; 10. Butt joint; 11, Butt plate; 12, Second grouting valve; 13, Sealed top cover; 14, Tube core; 15, Vacuum machine; 16, First pump Air valve; 17, air filter; 18, air extraction pressure gauge; 19, second air extraction valve; 20, third air extraction valve; 21, second waste slurry cylinder; 22, climbing ladder; 23, concrete layer in pipe 24. Concrete layer outside the pipe; 25. Socket; 26. Socket; 27. Prestressed steel wire; 28. Grouting port; 29. Flange sealing ring; 30. Inflatable rubber ring; 31. Mounting plate; 32. Load bearing 33, small diameter section; 34, middle diameter section; 35, large diameter section; 36, sealing groove; 37, sealing ring; 38, waste slurry collection valve; 39, vibrator.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that, in the specific implementation of the present invention, terms that may appear, such as “first” and “second” and other relational terms are only used to distinguish one entity or operation from another entity or operation , and does not necessarily require or imply that such an actual relationship or order exists between these entities or operations. Furthermore, terms such as "comprising", "comprising" or any other variation thereof that may appear are intended to encompass a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also Other elements not expressly listed or inherent to such a process, method, article or apparatus are also included. Without further limitation, the appearance of the phrase "comprising a..." etc. qualifying elements does not preclude the presence of additional identical elements in the process, method, article or device that includes the element.

In the description of the present invention, unless otherwise expressly specified and limited, terms that may appear such as "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication between the two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

In the description of the present invention, unless otherwise expressly specified and limited, the term "provided" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body or a separate body from the body. Arranged and connected on the body, the connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

The present invention will be further described in detail below with reference to the embodiments.

Embodiment 1 of the molding device for the protective layer of the prestressed concrete cylinder tube provided in the present invention:

As shown in FIG. 1 , the molding device for the protective layer of the prestressed concrete cylinder tube includes a grouting mold. The grouting mold is installed for the tube core 14 of the protective layer to be formed to form an annular space with the tube core 14. The grouting mold is connected with a Vacuuming equipment and grouting equipment, the vacuuming equipment is used to extract the air in the annular space, and the grouting equipment is used to inject mortar into the annular space.

As shown in FIG. 1 , the grouting mold includes a base 6 and an outer mold 7 , and the top of the outer mold 7 is provided with a sealing top cover 13 .

As shown in FIG. 2 , the base 6 includes a mounting plate 31 for mounting on a corresponding operating platform. A cylindrical bearing platform 32 is provided on the upper surface of the mounting plate 31 , and the outer diameter of the bearing platform 32 is smaller than that of the mounting plate 31 . The outer diameter, the bearing platform 32 includes a small diameter section 33, a middle diameter section 34 and a large diameter section 35 in sequence from top to bottom. Layer 23, a first step is formed between the middle diameter section 34 and the small diameter section 33, the first step is used to support the outer concrete layer 24 of the tube core 14, and a second step is formed between the large diameter section 35 and the middle diameter section 34 , the second step is used to support the outer mold 7. The base 6 is provided with base lifting lugs on the outer peripheral surface of the small diameter section 33 to facilitate the movement of the base 6 and improve work efficiency. A sealing groove 36 is provided on the outer peripheral surface of the small diameter section 33 , the first step and the outer peripheral surface of the large diameter section 35 , and a sealing ring 37 is arranged in the sealing groove 36 to realize the outer peripheral surface of the socket 25 of the tube core 14 . Sealing with the small diameter section 33 of the base 6 and between the outer mold 7 and the base 6 prevents the mortar injected into the annular space from leaking.

The outer mold 7 has a cylindrical structure, and the outer peripheral surface of the outer mold 7 is sequentially provided with a top reinforcing rib plate, a middle reinforcing rib plate and a bottom reinforcing rib plate from top to bottom to increase the overall strength of the outer mold 7 . The outer mold 7 is provided with a butt joint 10. The butt joint 10 extends along the axial direction of the outer mold 7. The butt joints 10 are provided with butt plates 11 on both sides. The form is respectively fixed on both sides of the butt joint 10, and the two sides of the butt joint 10 are connected by wearing fastening bolts on the two butt plates 11, and then the outer mold 7 is tightly hooped on the base 6, so that the outer mold 7 The inner wall surface of the bottom is in sealing fit with the large diameter section 35 of the bearing platform 32 . The top of the outer mold 7 is provided with a flange 9 for connecting with the sealing top cover 13, and a flange sealing groove is provided on the upper surface of the flange 9 for installing the flange sealing ring 29 to realize the flange 9 and the sealing top cover. 13 seals between. A ladder 22 is arranged vertically between the flange 9 of the outer mold 7 and the bottom reinforcing rib plate for the operator to climb. The outer surface of the outer mold 7 is also provided with an outer mold lifting lug 8 and a vibrator 39. The outer mold lifting lug 8 is used for lifting by the corresponding transportation equipment, which is convenient for installation and removal. The vibration generated by the vibrator 39 will cause the annular space The mortar in it is denser.

The sealing top cover 13 is a plate-like structure. The center of the sealing top cover 13 is provided with a perforation. The perforation is used for the socket 26 of the tube core 14 to pass through, so as to block the top end of the annular interval. The perforated hole wall is provided with a sealing recess. The inflatable rubber ring 30 is arranged in the sealing groove. When in use, the inflatable rubber ring 30 is in a deflated state when the sealing top cover 13 is not installed, so that the sealing top cover 13 can be set on the tube core 14, and in the After the sealing top cover 13 is connected to the top flange 9 of the outer mold 7, the inflatable rubber ring 30 is inflated to achieve the sealing between the tube core 14 and the sealing top cover 13 to prevent external air from entering the annular space. The sealing top cover 13 is also provided with an air suction port and a grouting port 28, and the air suction port and the grouting port 28 are distributed around the circumference of the perforation.

As shown in FIG. 1 , the air suction port is communicated with the vacuum pumping equipment. When the vacuum pumping equipment is turned on, the air in the annular gap is drawn out. The grouting port 28 is communicated with the grouting equipment. Inject mortar into the interval.

The grouting equipment includes a mortar mixer 1. The mortar mixer 1 is connected with a grouting machine 2 through a pipeline. The grouting machine 2 communicates with a grouting port 28 through a grouting pipeline. The grouting pipeline is sequentially provided with a first grouting valve 3. , grouting pressure gauge 4 and the second grouting valve 12. When the two grouting valves are open, they are used to inject the mortar in the mortar mixer 1 into the annular space through the grouting machine 2. The grouting pressure gauge 4 is used to display the grouting. pressure in the pipeline. A waste slurry collection pipe is connected to the grouting pipeline between the second grouting valve 12 and the grouting pressure gauge 4, and the bottom end of the waste slurry collection pipe is provided with a first waste slurry cylinder 5 for collecting excess waste slurry into the first waste pulp drum 5.

The vacuum pumping equipment includes a vacuum machine 15. The vacuum machine 15 is communicated with the air extraction port through an air transmission pipeline. The air transmission pipeline is provided with a first air extraction valve 16, an air filter 17, an air extraction pressure gauge 18, and a second air extraction valve 19. And the third air extraction valve 20, which is used to extract the air in the annular space when the three air extraction valves are opened. The suction pressure gauge 18 is used to display the pressure in the suction line. A waste slurry collection pipe is also connected to the air extraction pipeline between the third air extraction valve 20 and the second air extraction valve 19, and the bottom end of the waste slurry collection pipe is provided with a second waste slurry cylinder 21 for filling the annular space with The excess waste slurry after mortar is collected into the second waste slurry drum 21, and a waste slurry collection valve 38 is provided between the third air suction valve 20 and the second waste slurry drum 21 to control the on-off of the waste slurry collection pipeline. . Grouting equipment and vacuuming equipment are both in the prior art and will not be repeated here.

When installing, firstly sleeve the tube core 14 of the protective layer to be formed on the base 6, so that the bottom end of the inner tube concrete layer 23 of the tube core 14 is supported on the upper end surface of the bearing platform 32, the inner peripheral surface and the small diameter of the socket 25. The outer peripheral surface of the section 33 is sealed and matched, the bottom end of the outer concrete layer 24 is supported on the first step, and then the outer mold 7 is set on the large-diameter section 35 of the bearing platform 32, so that the bottom end of the outer mold 7 is supported on the second stage. Steps, then connect the outer mold 7 to the two sides of the seam 10, so that the outer mold 7 is tightly hoop on the base 6, then install the sealing top cover 13 on the outer mold 7, and then give the sealing top cover 13 The inflatable rubber ring 30 on the perforated hole is inflated, so that the tube core 14 and the sealing top cover 13 are sealed, and then the grouting equipment and the vacuuming equipment are connected to the sealing top cover 13 .

When grouting, the air in the annular space is first pumped out through the vacuum pumping equipment. When the vacuum degree in the annular space reaches -0.06MPa-0.1MPa, the mortar is injected into the annular space through the grouting equipment. Always keep the vacuuming equipment open during the grouting process. After injecting a certain amount of mortar into the annular space, start the vibrator 39 and grouting while vibrating to make the mortar in the annular space more compact. Observe the air filter 17 during grouting. When the mortar enters the air filter 17 and the slurry concentration reaches the required standard, close the second suction valve 19, open the waste slurry collection valve 38, and the mortar enters through the third suction valve 20 and the waste slurry collection valve 38. In the second waste slurry drum 21, when the mortar concentration in the waste slurry collection drum 21 reaches the same concentration as the poured mortar, close the first, second and third air extraction valves and the waste slurry collection valve 38, and then make the grouting equipment Continue to work for 1-2 minutes under the condition of maintaining the pressure of 0.6Mpa, stop grouting, and finally stop the vibrator 39, then remove the grouting equipment and vacuuming equipment from the sealing top cover, remove the sealing top cover 13, cover with steam Curing the hood, steaming the protective layer, and steam curing the protective layer. After the protective layer has reached the required strength after steam curing, the outer mold 7 is removed, and the protective layer is completed. The parts that need to be cleaned in the grouting equipment and vacuuming equipment can be removed and cleaned later for subsequent use.

In the forming device for the protective layer of the prestressed steel cylinder concrete pipe provided by the present invention, the sealing top cover closes the top of the annular space formed between the pipe core and the mold, and the annular space is evacuated by vacuuming equipment before grouting to lower the annular space. The air in the interval prevents the mortar from being blocked by the air in the gap when the mortar moves in the annular interval, which not only facilitates the movement of the mortar, but also prevents the air from filling the space of the mortar, making the mortar in the annular interval more compact, which is beneficial to improve the prestressed concrete pipe. Compared with the prior art, the grouting time is reduced, the mortar compactness is increased, and the work efficiency is improved.

Embodiment 2 of the molding device for the protective layer of the prestressed concrete cylinder tube provided in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the sealing top cover 13 is detachably connected to the outer mold 7 . In this embodiment, the sealing top cover 13 is integrally formed with the outer mold 7 .

Embodiment 3 of the molding device for the protective layer of the prestressed concrete cylinder tube provided in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the sealing structure is an inflatable rubber ring 30 . In this embodiment, a common sealing ring 37 is installed in the sealing groove on the perforation of the sealing top cover 13 .

Embodiment 1 of the molding method of the protective layer of the prestressed concrete cylinder tube provided by the present invention:

The forming method of the protective layer of the prestressed concrete cylinder tube includes three steps: installation, grouting and hardening:

When installing, firstly sleeve the tube core 14 of the protective layer to be formed on the base 6, so that the bottom end of the inner tube concrete layer 23 of the tube core 14 is supported on the upper end surface of the bearing platform 32, the inner peripheral surface and the small diameter of the socket 25. The outer peripheral surface of the section 33 is sealed and matched, the bottom end of the outer concrete layer 24 is supported on the first step, and then the outer mold 7 is set on the large-diameter section 35 of the bearing platform 32, so that the bottom end of the outer mold 7 is supported on the second stage. step, and then connect the outer mold 7 to the two sides of the seam 10, so that the outer mold 7 is tightly clamped on the base 6, and then the sealing top cover 13 is installed on the outer mold 7, and then the sealing top cover is The inflatable rubber ring 30 on the perforation of 13 is inflated to seal between the tube core 14 and the sealing top cover 13 , and then the grouting equipment and the vacuuming equipment are connected to the sealing top cover 13 .

When grouting, the air in the annular space is first pumped out through the vacuum pumping equipment, and then the mortar is injected into the annular space through the grouting equipment. After injecting a certain amount of mortar, start the vibrator 39, grouting while vibrating, so that the mortar in the annular space is more compact, observe the condition of the air filter 17 during grouting, when the mortar enters the air filter 17 and the slurry When the concentration reaches the required standard, close the second suction valve 19 and open the waste slurry collection valve 38. The mortar enters the second waste slurry cylinder 21 through the third suction valve 20 and the waste slurry collection valve 38. When the waste slurry collector 21 When the concentration of the mortar in the pump reaches the same concentration as the poured mortar, close the first, second and third air extraction valves and the waste slurry collection valve 38, and then make the grouting equipment continue to work for 1 to 2 minutes while maintaining the pressure of 0.6Mpa. The grouting is stopped, and finally the vibrator 39 is stopped.

When hardening, remove the sealing top cover 13, cover the steam curing cover, pass on the steam, and carry out steam curing for the protective layer.

The parts that need to be cleaned in the grouting equipment and vacuuming equipment can be removed and cleaned later for subsequent use.

The mortar in this example adopts #425-525 ordinary Portland cement, the sand fineness modulus is less than 3.2, the mud content is less than 1%, and the admixture is microfoam. The dip-coating anti-corrosion layer of the prestressed steel wire 27 on the tube core 14 is E44 epoxy resin, the epoxy resin in summer is ethylenediamine:dibutyl ester=100:5～6:10～15, the epoxy resin is in winter ratio It is ethylenediamine:dibutyl ester=100:8～10:10～15, the above is the basic ratio, it is suitable for normal temperature 15℃～40℃, it can be adjusted according to the on-site temperature change, and the epoxy resin is heated in winter to increase The amount of ethylenediamine, the epoxy resin curing time is controlled within 4 to 7 hours. After the tube core is wound with prestressed steel wire and the epoxy resin coating is dipped and cured, a mortar protective layer is made.

The method for forming the protective layer of a prestressed concrete cylinder tube provided by the present invention seals the top of the annular space formed between the tube core and the mold, and evacuates the annular space before grouting to reduce the air in the annular space and avoid the When the mortar moves in the annular interval, it is blocked by the air in the gap, which not only facilitates the movement of the mortar, but also avoids air filling the space of the mortar, so that the mortar in the annular interval is more compact, which is beneficial to improve the quality of the prestressed concrete pipe. Compared with grouting from the distributor to the annular space, the grouting time is reduced, the mortar compactness is increased, and the work efficiency is improved.

The specific equipment and structures mentioned in this embodiment are the equipment and structures in the above-mentioned embodiments of the forming apparatus for the protective layer of the prestressed concrete cylinder tube, and are not repeated here.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims, and any equivalent structural changes made by using the description and accompanying drawings of the present invention , similarly, should be included in the protection scope of the present invention.

Claims (10)

1. The forming method of the prestressed concrete cylinder pipe protective layer comprises a die filling step of installing a pipe core (14) wound with prestressed steel wires (27) in a die to form an annular space between the pipe core (14) and the die, and a grouting step of injecting mortar into the annular space; the method is characterized in that the top of the annular space is closed before grouting, the closed annular space is vacuumized, and mortar is injected into the annular space through grouting equipment.

2. The method for forming a prestressed concrete cylinder pipe protective layer according to claim 1, wherein before the completion of the grouting, the vacuuming operation is continuously performed.

3. The method for forming a prestressed concrete cylinder pipe protective layer according to claim 1 or 2, wherein mortar is injected into the annular space from the top of the annular space.

4. The method for forming a prestressed concrete cylinder pipe protective layer according to claim 1 or 2, further comprising a hardening step of covering a steam curing hood above the pipe core (14) to steam cure the mortar in the annular space to harden and form the mortar in the annular space, wherein the top of the annular space is opened when hardening.

5. Forming device of prestressing force steel cylinder concrete pipe protective layer, including the slip casting mould, the slip casting mould includes external mold (7) and base (6), base (6) are used for supplying die (14) vertical installation, external mold (7) are used for installing the radial outside of die (14) in order to enclose into the annular space with the outer wall of die (14), a serial communication port, the top of external mold (7) is equipped with seal cap (13), seal cap (13) are the loop configuration, the radial inboard of seal cap (13) is equipped with and is used for sealing the seal structure on top with die (14) outer wall face seal assembly in order to seal the annular space, be equipped with the slip casting mouth that is used for with grouting equipment intercommunication on the slip casting mould, be equipped with the extraction opening that is used for with evacuation equipment intercommunication on seal cap (13).

6. The prestressed concrete cylinder pipe protective layer forming device according to claim 5, wherein a sealing groove is formed on the radially inner side of the sealing top cover (13), an inflatable rubber ring (30) is arranged in the sealing groove, and the inflatable rubber ring (30) is used as a sealing structure to expand after inflation so as to be tightly attached to the socket (26) of the pipe core (14) for sealing.

7. A prestressed concrete cylinder pipe protective layer forming apparatus according to claim 5 or 6, wherein the sealing top cover (13) is detachably connected to the outer mold (7).

8. The forming device for the prestressed concrete cylinder pipe protective layer according to claim 5 or 6, wherein the outer peripheral surface of the outer die (7) is provided with a butt joint seam (10) for enabling the outer die (7) to contract and expand along the circumferential direction, and two sides of the butt joint seam (10) are provided with butt joint structures for enabling the outer die (7) to be tightly held on the base (6).

9. The apparatus for forming a prestressed concrete cylinder pipe protective layer according to claim 5 or 6, wherein a grouting port (28) is provided on the sealing cap (13).

10. The forming device for the prestressed concrete cylinder pipe protective layer according to claim 9, wherein a waste mortar cylinder is connected to the grouting opening (28) and/or the suction opening.

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