Steam curing device for rapid forming of non-soil-squeezing cast-in-place pile in low-temperature drought environment
Through the device of manufacturing steam channels on the surface of concrete cast piles, the problems of difficult construction and poor maintenance effects of cast piles in cold and dry environments are solved, and rapid forming and high-quality strength of piles are achieved.
Patent Information
- Application Number
- CN202510135241.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2025-05-02
AI Technical Summary
When constructing concrete cast piles in cold and dry environments, the soil has poor drying and water retention ability, and low-temperature spraying can easily lead to shallow freezing and pile cracks. The existing surface heating methods have safety hazards and poor maintenance effect, making it difficult to ensure the forming quality of cast piles.
A steam maintenance device for a low-temperature and arid environment is designed, including a first injection molded pipe, a second injection molded pipe and a pull wire. By operating the embedded parts after filling construction, a steam channel is manufactured on the surface of the concrete cast pile, and a steam channel is used for heating and water maintenance.
By forming a continuous steam channel, uniform heating and water replenishment of piles can be achieved, the strength development speed of concrete cast-infused piles can be improved, crack defects caused by low temperature freeze-thaw or drying and lack of water can be avoided, and the rapid forming and high quality of cast-infused piles can be ensured.
Smart Images
Figure CN119910753A_ABST
Abstract
Description
Technical field:
[0001] The invention relates to the technical field of concrete pile steam curing. Background technology:
[0002] The curing time and curing strength of concrete are greatly affected by the external environment temperature and humidity. When casting concrete structures and precast concrete parts, it is often necessary to use water spraying, fire baking, steam and other means to maintain them after demolding in order to ensure that the strength of the concrete meets the standard.
[0003] When constructing bored concrete piles in a cold and dry environment, the soil has poor water retention capacity and spraying at low temperatures can easily lead to shallow freezing and cause cracks in the pile body. This makes maintenance difficult and the quality of bored pile formation difficult to ensure. Usually, one can only avoid bored pile construction in such extreme environments, or perform spraying and surface heating at the same time. However, the effective heating depth of surface heating is shallow and the temperature gradient varies greatly with depth. The actual maintenance effect is very poor. In addition, there are safety hazards in using common surface heating methods such as open flames at the construction site.
[0004] Although there are mature steam curing solutions for precast concrete parts, they need to be carried out after the mold is removed and the concrete surface is exposed. In cast-in-place pile construction, the soil layer on the surface of the grouting hole is directly used as the pile mold, and steam curing cannot be carried out directly without a steam channel. If the steam channel is processed by pulling out the embedded parts or drilling holes on the pile interface after the pile body is initially solidified, there will still be problems such as small contact area between the steam and the pile body and uneven heating and water replenishment. Summary of the invention:
[0005] In view of this, it is necessary to design an embedded part that is pulled out after the concrete pile is initially hardened, and through the operation of the embedded part after the pouring construction, a steam channel for steam curing is manufactured on the surface of the concrete pile.
[0006] The steam curing device used for rapid prototyping of non-squeezed cast-in-place piles in low-temperature and arid environments is characterized by comprising a first injection mold tube, a second injection mold tube and a pull wire.
[0007] The first injection molded tube consists of a tube body, a tube shaft and a wire wheel. The tube body is a metal tube with a smooth outer surface. There are two tube shafts and multiple wire wheels. The wire wheels are distributed and installed on the tube shafts and installed in the tube body together with the tube shafts. Multiple wire collection holes are set on the surface of the tube body.
[0008] The second injection molded tube is a metal tube with a smooth and flat outer surface and is provided with a plurality of wire release holes.
[0009] The pull wire is a steel wire rope, and there are multiple of them. One end of each pull wire passes through a wire-receiving hole of the first injection molded tube and is connected to the wire wheel, and the other end passes through a wire-releasing hole of the second injection molded tube and enters the second injection molded tube. The connection between each pull wire and the second injection molded tube is lower than the connection between it and the first injection molded tube.
[0010] The steam curing device completes the layout of the first injection mold tube and the second injection mold tube and connects the wire before the pile body is poured. The wire reserves a 20 to 30 cm length margin in the second injection mold tube. Two to four hours after the pouring operation is completed and the concrete is initially set, the pipe shaft is turned to drive the wire wheel to drag the wire into the first injection mold tube for winding, and the operation is repeated every hour thereafter, with each winding length of 1 to 2 cm, until the concrete completes the final setting and enters the curing stage. In this process, the space occupied by the wire itself and the deformation during the intermittent dragging and winding action squeeze the concrete pile body to form a wire hole, which is in contact with the interface between the concrete and the soil layer.
[0011] Before the maintenance operation, the pipe shaft is rotated to drive the wire wheel so that the pulling wire can completely retract the first injection molding tube, and then the first injection molding tube and the second injection molding tube are pulled out vertically to form a continuous channel consisting of the first injection molding tube hole, the wire hole, and the second injection molding tube hole at the interface between the concrete pile and the soil layer, which serves as a steam channel for the steam maintenance operation of the pile body. After connecting the steam pipe, steam is injected from the first injection molding tube hole, diffused through the wire hole to heat and replenish water on the surface of the pile body, and then discharged from the second injection molding tube hole. The condensed water generated during this period will gather along the wire hole to the low-position second injection molding tube. Insert a small diameter hose into the second injection molding tube and connect the pump to discharge excess condensed water to prevent condensed water from clogging the low-position wire hole and causing failure of steam maintenance.
[0012] After the curing operation, the steam curing channel is filled by grouting through the second injection mold tube hole, and the grouting overflows upward from the low second injection mold tube hole into the first injection mold tube hole to reduce defects such as residual pores in the line hole.
[0013] Since the commonly used round tubes in the construction process have a small deformation range due to circumferential extrusion after the initial setting of concrete, and it is difficult to pull out, round tubes should not be used for the first injection molded tube and the second injection molded tube. At the same time, considering the arrangement of the tube shaft and the wire wheel, preferably, the tube body of the first injection molded tube is composed of two round tubes with longitudinal grooves, so that an internal cavity with an 8-shaped cross section is formed inside, and the two tube shafts and the attached wire wheels are respectively installed at both ends of the internal cavity. Based on the same considerations, preferably, the second injection molded tube is a square tube.
[0014] In this structural design, the advantage of the first injection molded tube 8-shaped spliced tube scheme over the square tube is that during the pouring, initial solidification of the pile body and pull-out process, the spliced joint is subjected to a greater degree of compression and concave deformation, which facilitates the pull-out operation. At the same time, the deformation of the two arc parts is evenly distributed during the deformation of the tube body, and it is not easy for local deformation concentration to cause plastic deformation, which affects the reuse life of the tube body. The square tube is used in the second injection molded tube scheme because there is no moving mechanism inside the second injection molded tube, and the concave deformation will not cause any collateral effects, has little impact on the reuse life and has lower costs.
[0015] Preferably, the wire collection hole is located on the first injection molded tube facing away from the second injection molded tube, and the wire release hole is located on the second injection molded tube facing away from the first injection molded tube, so that the wire pulling wire and the wire hole formed by the wire pulling wire are located at the outermost part of the pile body.
[0016] The present design also provides a scheme for the connection between the pull wire and the reel as follows: preferably, a collar is provided at the connection end between the pull wire and the first injection molded tube, a bolt connected to the collar is provided on the outside of the reel, and a groove is provided on the rim of the reel at the bolt. The groove is used to allow the pull wire to be inserted into the reel along the groove when the collar is connected to the bolt. Furthermore, the wire collection hole is a strip hole, one end of the strip hole is coplanar with the corresponding reel, and the other end is inclined to extend to be coplanar with the bolt. Under this structure, the collar extends into the first injection molded tube and is connected to the bolt at one end where the strip hole is coplanar with the bolt. After the pull wire is inserted into the reel along the groove, the pull wire extends from the other end where the strip hole is coplanar with the reel. This facilitates the installation of the pull wire and prevents the pull wire from escaping from the reel along the groove when the tube shaft is rotated to collect the wire, causing a malfunction.
[0017] Preferably, the surface of the cable is coated with wax to prevent the cable from being too tightly connected to the pile body after the concrete solidifies, resulting in the cable breaking when it is reeled in. Based on similar considerations, after the cable is installed, the reeling hole and the laying hole should be sealed with adhesive tape, plastic film or paraffin before pouring.
[0018] The present invention provides a pre-embedded part design for steam curing of bored piles. Through two injection mold tubes and a wire-pulling reeling structure therebetween, a continuous steam channel is formed on the interface between the pile body and the soil layer after the equipment is reeled and pulled out. Steam is subsequently introduced into the steam channel to achieve steam heating and water replenishment curing of the pile body. In a low-temperature and arid environment, the strength development speed of the concrete bored pile can be greatly improved to enable rapid molding, and crack defects on the surface of the pile body due to low-temperature freezing and thawing or dryness and lack of water can be effectively prevented. Description of the drawings:
[0019] Figure 1 It is a schematic diagram of the principle of a specific embodiment of a steam curing device for rapid prototyping of non-squeezed cast-in-place piles in a low-temperature and arid environment;
[0020] Figure 2 It is a side view structural schematic diagram of a specific embodiment of a steam curing device for rapid prototyping of non-squeezed cast-in-place piles in a low-temperature arid environment;
[0021] Figure 3 It is a schematic diagram of the installation structure of a specific embodiment of a steam curing device for rapid prototyping of non-squeezed cast-in-place piles in a low-temperature and arid environment;
[0022] Figure 4 It is a top view schematic diagram of the installation structure of a specific embodiment of a steam curing device for rapid prototyping of non-squeezed cast-in-place piles in a low-temperature arid environment;
[0023] Figure 5 It is a schematic diagram of the wire wheel installation structure of a specific embodiment of a steam curing device for rapid prototyping of non-squeezed cast-in-place piles in a low-temperature arid environment;
[0024] Figure 6 The invention is a schematic diagram of the principle structure of a wire wheel and a wire take-up hole of a specific embodiment of a steam curing device for rapid prototyping of non-soil-squeezing cast-in-place piles in a low-temperature arid environment.
[0025] In the figure: a first injection molded tube 1, a tube body 101, a wire collection hole 1011, a tube shaft 102, a wire wheel 103, a bolt 1031, a slot 1032, a second injection molded tube 2, a wire release hole 201, and a wire pulling wire 3. Specific implementation method:
[0026] The steam curing device for rapid prototyping of non-squeezed cast-in-place piles in low-temperature and arid environments is characterized by comprising a first injection mold tube 1 , a second injection mold tube 2 and a pull wire 3 .
[0027] The first injection molded tube 1 consists of a tube body 101, a tube shaft 102 and a wire wheel 103. The tube body 101 is a metal tube with a smooth outer surface. It is composed of two round tubes with longitudinal grooves spliced together to form an internal cavity with an 8-shaped cross-section. There are two tube shafts 102 and multiple wire wheels 103. The wire wheels 103 are distributed and installed on the tube shafts 102 and are installed in the tube body 101 together with the tube shafts 102. Multiple wire collection holes 1011 are provided on the surface of the tube body 101.
[0028] The second injection molded tube 2 is a metal square tube with a smooth outer surface and is provided with a plurality of wire-releasing holes 201 .
[0029] The pull wire 3 is a steel wire rope, and there are multiple of them. One end of each pull wire 3 passes through the tube body 101 through a wire taking-up hole 1011 of the first injection molded tube 1 and is connected to the wire wheel 103, and the other end passes through the second injection molded tube 2 through a wire releasing hole 201 of the second injection molded tube 2. The connection between each pull wire 3 and the second injection molded tube 2 is lower than the connection between it and the first injection molded tube 1.
[0030] The steam curing device completes the layout of the first injection mold tube 1 and the second injection mold tube 2 and connects the wire 3 before the pile body is poured. The wire 3 reserves a 20 to 30 cm length margin in the second injection mold tube 2. Two to four hours after the pouring operation is completed and the concrete is initially set, the pipe shaft 102 is rotated to drive the wire wheel 103 to drag the wire 3 into the first injection mold tube 1 for winding, and the operation is repeated once every hour thereafter, with each winding length of 1 to 2 cm, until the concrete completes the final setting and enters the curing stage. In this process, the space occupied by the wire 3 itself and the deformation during the intermittent dragging and winding action squeeze the concrete pile body to form a wire hole, which is in contact with the interface between the concrete and the soil layer.
[0031] Before the maintenance operation, the pipe shaft 102 is rotated to drive the wire wheel 103 to make the pulling wire 3 completely retract the first injection molding tube 1, and then the first injection molding tube 1 and the second injection molding tube 2 are pulled out vertically to form a continuous channel consisting of the first injection molding tube 1 hole, the wire hole, and the second injection molding tube 2 hole at the interface between the concrete pile and the soil layer, which serves as a steam channel for the steam maintenance operation of the pile body. After connecting the steam pipe, steam is injected from the hole of the first injection molding tube 1, diffused through the wire hole to heat and replenish the surface of the pile body, and then discharged from the hole of the second injection molding tube 2. The condensed water generated during this period will gather along the wire hole to the low-position second injection molding tube 2. Insert a small diameter hose into the second injection molding tube 2 and connect a pump to discharge excess condensed water to prevent condensed water from clogging the low-position wire hole and causing failure of steam maintenance.
[0032] After the curing operation, the steam curing channel is filled by grouting through the second injection mold tube 2 hole, and the grouting overflows upward from the low second injection mold tube 2 hole into the first injection mold tube 1 hole to reduce defects such as residual pores in the line hole.
[0033] The advantage of the first injection molded tube 18-shaped spliced tube scheme over the square tube is that during the pouring, initial solidification of the pile body and the pull-out process, the spliced joint is subjected to a greater degree of compression and concave deformation, which facilitates the pull-out operation. At the same time, the deformation of the two arc portions is evenly distributed during the deformation of the tube body 101, and it is not easy for local deformation concentration to cause plastic deformation, thereby affecting the reuse life of the tube body 101. The square tube is used in the second injection molded tube 2 scheme because there is no moving mechanism inside the second injection molded tube 2, and the concave deformation will not cause any collateral effects, has little impact on the reuse life and has lower costs.
[0034] The wire receiving hole 1011 is located on the first injection molded tube 1 facing away from the second injection molded tube 2, and the wire releasing hole 201 is located on the second injection molded tube 2 facing away from the first injection molded tube 1, so that the wire 3 and the wire hole formed by the wire 3 are located at the outermost part of the pile body.
[0035] A collar is provided at the connection end of the pull wire 3 and the first injection molded tube 1, a bolt 1031 sleeved with the collar is provided on the outer side of the wire wheel 103, and a groove 1032 is provided at the bolt 1031 on the rim of the wire wheel 103, and the groove 1032 is used to allow the pull wire 3 to be received into the wire wheel 103 along the groove 1032 when the collar is connected to the bolt 1031. The wire receiving hole 1011 is a strip hole, one end of which is coplanar with the corresponding wire wheel 103, and the other end is inclined to extend to be coplanar with the bolt 1031. The lower ring of the structure extends into the first injection molded tube 1 and is connected to the bolt 1031 at one end where the strip hole is coplanar with the bolt 1031. After the pull wire 3 is inserted into the wire wheel 103 along the groove 1032, the pull wire 3 extends out from the other end where the strip hole is coplanar with the wire wheel 103, which facilitates the installation of the pull wire 3 and prevents the pull wire 3 from escaping from the wire wheel 103 along the groove 1032 when the tube shaft 102 is rotated to reel in, causing a malfunction.
[0036] The surface of the cable 3 is coated with wax to prevent the cable 3 from being too tightly connected to the pile body after the concrete solidifies, resulting in the cable 3 breaking when it is taken up. Based on similar considerations, after the cable 3 is installed, the take-up hole 1011 and the release hole 201 should be sealed with adhesive tape, plastic film or paraffin before pouring.
[0037] In this design, technical details such as the installation of the tube shaft, the installation of the spool and the tube shaft, and the end sealing of the bottom of the first injection molded tube and the second injection molded tube are handled by conventional solutions. The specific selection of the treatment solution does not constitute an essential impact on the functional realization of this design, and will not be elaborated here.
Claims
1. A steam curing device for rapid prototyping of non-squeezed cast-in-place piles in low-temperature and arid environments, characterized by: It includes a first injection molded tube, a second injection molded tube and a pull wire; The first injection molded tube is composed of a tube body, a tube shaft and a wire wheel. The tube body is a metal tube with a smooth outer surface. There are two tube shafts and multiple wire wheels. The wire wheels are distributed and installed on the tube shafts and installed in the tube body together with the tube shafts. Multiple wire collection holes are arranged on the surface of the tube body. The second injection molded tube is a metal tube with a smooth outer surface and provided with a plurality of wire release holes; The pull wire is a steel wire rope, and there are multiple of them. One end of each pull wire passes through a wire-receiving hole of the first injection molded tube and is connected to the wire wheel, and the other end passes through a wire-releasing hole of the second injection molded tube and enters the second injection molded tube. The connection between each pull wire and the second injection molded tube is lower than the connection between it and the first injection molded tube.
2. The steam curing device for rapid prototyping of non-squeezing cast-in-place piles in low-temperature arid environments as claimed in claim 1, characterized in that: The first injection molded tube body is formed by splicing two circular tubes with longitudinal grooves, so that an inner cavity with an 8-shaped cross section is formed inside, and two tube shafts and attached wire wheels are respectively installed at both ends of the inner cavity.
3. The steam curing device for rapid prototyping of non-squeezing cast-in-place piles in low-temperature arid environments as claimed in claim 2, characterized in that: The wire collection hole is located on the first injection mold tube and faces away from the second injection mold tube, and the wire release hole is located on the second injection mold tube and faces away from the first injection mold tube.
4. The steam curing device for rapid prototyping of non-squeezing cast-in-place piles in low-temperature arid environments as claimed in claim 3, characterized in that: A sleeve is provided at the connecting end of the pull wire and the first injection molded tube, a bolt connected with the sleeve is provided on the outer side of the wire wheel, and a groove is opened at the bolt at the rim of the wire wheel. The groove is used to allow the pull wire to be inserted into the wire wheel along the groove when the sleeve is connected to the bolt.
5. The steam curing device for rapid prototyping of non-squeezing cast-in-place piles in low-temperature arid environments as claimed in claim 4, characterized in that: The wire collection hole is a strip-shaped hole, one end of which is coplanar with the corresponding wire wheel, and the other end of which is inclined and extends to be coplanar with the bolt column.
6. The steam curing device for rapid prototyping of non-squeezing cast-in-place piles in low-temperature arid environments as claimed in claim 1, characterized in that: The surface of the pull wire is coated with wax.
7. The steam curing device for rapid prototyping of non-squeezing cast-in-place piles in low-temperature arid environments as claimed in claim 1, characterized in that: The second injection molded tube is a square tube.