CN111877764B - Pipe clamp support structure and construction method for long-distance pumping of machine-made sand concrete - Google Patents
Pipe clamp support structure and construction method for long-distance pumping of machine-made sand concrete Download PDFInfo
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- CN111877764B CN111877764B CN202010770747.0A CN202010770747A CN111877764B CN 111877764 B CN111877764 B CN 111877764B CN 202010770747 A CN202010770747 A CN 202010770747A CN 111877764 B CN111877764 B CN 111877764B
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- E—FIXED CONSTRUCTIONS
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- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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Abstract
本发明公开了管卡支撑结构，包括支撑台，支撑台设第一液压杆和第二液压杆，第一液压杆固接伺服电机、驱动轴、主动齿轮及齿圈；输入管道通过输入管卡连接椭圆形料管I，输入管卡包括角铁及环形条块，环形条块设环形卡槽与法兰孔；输出管道通过输出管卡与椭圆形料管II连接，椭圆形料管I与椭圆形料管II之间设椭圆形料管III；位于中部的椭圆形料管III外壁套接圆形支撑环，圆形支撑环固接弹簧杆，弹簧杆铆接水平固定杆和倾斜摆动杆，水平固定杆与倾斜摆动杆之间铆接第三液压杆；本发明还提出了用于长距离泵送机制砂混凝土的施工方法。本发明综合机制砂混凝土配方与泵送结构的两方面调整，彻底解决混凝土的长距离泵送问题，适用于300米以上的泵送。
The present invention discloses a pipe clamp support structure, including a support platform, a first hydraulic rod and a second hydraulic rod are arranged on the support platform, the first hydraulic rod is fixedly connected to a servo motor, a driving shaft, a driving gear and a gear ring; an input pipeline is connected to an elliptical material pipe I through an input pipe clamp, the input pipe clamp includes an angle iron and an annular bar, and the annular bar is provided with an annular clamping groove and a flange hole; an output pipeline is connected to an elliptical material pipe II through an output pipe clamp, and an elliptical material pipe III is arranged between the elliptical material pipe I and the elliptical material pipe II; the outer wall of the elliptical material pipe III located in the middle is sleeved with a circular support ring, the circular support ring is fixedly connected to a spring rod, the spring rod is riveted to a horizontal fixed rod and an inclined swing rod, and a third hydraulic rod is riveted between the horizontal fixed rod and the inclined swing rod; the present invention also proposes a construction method for long-distance pumping of machine-made sand concrete. The present invention comprehensively adjusts the two aspects of the machine-made sand concrete formula and the pumping structure, thoroughly solves the problem of long-distance pumping of concrete, and is suitable for pumping over 300 meters.
Description
Technical Field
The invention relates to the technical field of concrete pumping, in particular to a pipe clamp supporting structure and a construction method for long-distance pumping machine-made sand concrete.
Background
In recent years, with the rapid increase of engineering construction and the lack of natural sand resources, the application of machine-made sand to replace natural sand is imperative, and the investigation and research of Anhui provinces have mineral resources such as limestone and granite with rich reserves, and the exploitation is convenient, so that the limestone machine-made sand is often used as fine aggregate in highway and water transportation engineering, the scientific and reasonable use of the machine-made sand not only can improve the working performance and mechanical property of concrete, but also can greatly reduce the engineering cost, and therefore, anhui province construction units gradually adopt the machine-made sand to replace natural sand to carry out highway and water transportation engineering construction.
However, compared with natural sand, the machine-made sand has coarser particles and also contains a certain amount of stone powder, so that the viscosity of the machine-made sand concrete is relatively high, and the actual performance of the machine-made sand concrete can be influenced in the long-distance pumping process. Therefore, research and analysis are carried out on the application of the machine-made sand concrete in the long-distance pumping technology, so that the method has extremely important practical significance in improving the problems of the machine-made sand concrete in the long-distance pumping technology application.
In order to solve the problem, project organization experts and technicians based on projects such as S11 turnip to yellow mountain highway WHLJ-01 contract section and S11 turnip to yellow mountain highway WHLJ-07 contract section are under construction, and the technical problem of easy blockage at the long-distance pumping pipeline nodes is effectively solved by analyzing and testing the working performance and mechanical properties of the machine-made sand concrete, and simultaneously, the problem of easy blockage is solved by combining a novel pipe clamp supporting structure.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a pipe clamp supporting structure and a construction method for long-distance pumping machine-made sand concrete.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The pipe clamp supporting structure comprises a supporting table arranged below a pumping pipeline node, a first hydraulic rod and a second hydraulic rod are vertically arranged on the upper surface of the supporting table, a servo motor is fixedly connected to the top end of the first hydraulic rod, an arc chute is fixedly connected to the top of a shell of the servo motor, a groove part on the upper surface of the arc chute is in sliding fit with the lower part of the pipe wall of an input pipeline, a driving shaft is arranged on the servo motor, a bearing seat which is in sleeve joint fit with the driving shaft is arranged at the top end of the second hydraulic rod, a driving gear is fixedly connected to the middle part of the driving shaft, a gear ring is meshed with the driving gear, and the gear ring is fixedly arranged on the outer ring of the input pipe clamp;
The input pipeline is connected with an oval material pipe I through an input pipe clamp, one end of the input pipeline, which is close to the oval material pipe I, is provided with a hole-free flange ring, one end of the oval material pipe I, which is close to the input pipeline, is provided with a pin hole flange ring, the input pipe clamp consists of angle irons at two ends and annular strips at the middle, the two angle irons of the input pipe clamp are connected in a fitting way through fastening bolts, the inner cambered surface of the annular strips of the input pipe clamp is provided with two groups of annular clamping grooves, one group of annular clamping grooves is in sleeve joint with the hole-free flange ring, the other group of annular clamping grooves is in sleeve joint with the pin hole flange ring, the annular strips of the input pipe clamp are not provided with holes at one end face position, which is close to the oval material pipe I, of the pin hole flange ring at one end of the oval material pipe I is fixed in the flange hole through fastening bolts, and the gear ring is fixed on the outer ring of the annular strips of the input pipe clamp;
The output pipeline is connected with an oval material pipe II at the tail part through an output pipe clamp, one end of the output pipeline, which is close to the oval material pipe II, is also provided with a non-hole flange ring, the output pipe clamp also comprises angle irons at two ends and annular strip blocks at the middle part, the two angle irons of the output pipe clamp are connected in a fit manner through fastening bolts, the inner cambered surface of the annular strip block of the output pipe clamp is provided with two groups of annular clamping grooves, one group of annular clamping grooves is in sleeve joint fit with the non-hole flange ring, the other group of annular clamping grooves is in sleeve joint fit with the pin hole flange ring, the position, close to one end face of the output pipeline, of the annular strip block of the output pipe clamp is provided with a flange hole, and the pin hole flange ring at one end of the oval material pipe II is fixed in the flange hole through the fastening bolts;
2-13 groups of oval pipes III are arranged between the oval pipes I and the oval pipes II, the vertical sections of the 2-13 groups of oval pipes III are oval, the inclined sections at the two ends are all right circles, the inclined sections at the two ends are symmetrically arranged, the two ends of the oval pipes III are all provided with non-porous flange rings, the non-porous flange rings are fixedly arranged at the inclined sections, transition pipe clamps are arranged between the adjacent non-porous flange rings and are also composed of angle irons at the two ends and annular strips at the middle part, the two angle irons of the transition pipe clamps are connected in a fitting mode through fastening bolts, and the inner cambered surfaces of the annular strips of the transition pipe clamps are provided with two groups of annular clamping grooves which are sleeved and matched with the pin hole flange rings;
The outer wall of the elliptical material pipe III positioned in the middle is sleeved with a circular supporting ring, the bottom of the outer ring of the circular supporting ring is fixedly connected with a spring rod, one end of the spring rod, which is far away from the circular supporting ring, is riveted with a horizontal fixed rod and an inclined swinging rod, one end of the horizontal fixed rod, which is far away from the spring rod, is vertically fixedly connected with a movable rod section of the second hydraulic rod, and one end of the inclined swinging rod, which is far away from the spring rod, is vertically fixedly connected with the outer ring of the annular strip block of the output pipe clamp;
A third hydraulic rod is riveted between the horizontal fixing rod and the inclined swinging rod, and the horizontal fixing rod, the inclined swinging rod and the third hydraulic rod form a deformable triangle.
Preferably, the inner side walls of the annular clamping grooves of the input pipe clamp, the transition pipe clamp and the output pipe clamp are subjected to smooth treatment, and the non-porous flange ring and the pin hole flange ring are subjected to smooth treatment, so that water tightness is ensured, and a large amount of muddy water is prevented from penetrating into the gaps of the pipe clamps.
Preferably, sealing rubber rings are arranged between adjacent non-porous flange rings in a cushioning manner, so that friction force and buffering performance are improved, and torque force transmission efficiency between transition pipe clamps is facilitated.
Preferably, a smooth sealing sheet is arranged between the non-porous flange ring and the pinhole flange ring in a cushioning manner, so that the sealing performance and the friction damage resistance of the input pipe clamp and the output pipe clamp are improved.
Preferably, the servo motor is a positive and negative low-speed motor, the oval material pipe I, the oval material pipe II and the oval material pipe III form a twistable node bent pipe, when the device is used, the servo motor is rotated forward for half a circle and then rotated backward for half a circle, and the forward rotation and the backward rotation are alternately carried out, so that torque transmission among the oval material pipe I, the oval material pipe II and the oval material pipe III is realized, a vector twisting type stirring process is realized, cement mortar can be fully stirred in the node bent pipe, and the risk of pipeline blockage caused by layering, precipitation and even drying of the cement mortar at the node is avoided.
Based on the pipe clamp supporting structure, the invention also provides a construction method for long-distance pumping machine-made sand concrete, which comprises the following steps:
a. screening machine-made sand concrete raw materials, namely screening a proper amount of cement, water, fly ash, machine-made sand, broken stone and additives according to strength requirements, wherein the machine-made sand is specifically fine aggregate crushed by limestone or granite through a machine, the cement adopts silicate cement, the stone powder content in the machine-made sand is 0-20%, and the water reducing rate of the broken stone and the fly ash without alkali active additives is not suitable to be less than 16%;
b. According to the strength requirement, the optimal stone powder content in the machine-made sand used by the C30 machine-made sand concrete is 10% -15%, the optimal stone powder content in the machine-made sand used by the C40 machine-made sand concrete is 5% -12%, the optimal stone powder content in the machine-made sand used by the C50 machine-made sand concrete is 5% -7%, the optimal stone powder content in the machine-made sand used by the C60 machine-made sand concrete is not more than 5%, and the sand rate is improved by 2% -4% compared with natural sand;
c. B, transporting the machine-made sand concrete, namely placing all raw materials of the machine-made sand concrete in the step b into a stirrer in a transport vehicle by adopting a high-pressure pump, continuously stirring at a speed of 1-3 revolutions per minute in the transport process, and discharging after stirring by a stirring cylinder for 1-2 minutes before transporting to a site for discharging;
d. pumping machine-made sand concrete, namely paving a conveying pipe, namely paving straight, short and flat conveying pump inlet horizontal pipes by at least 15m, fixing the conveying pipe every 3m, covering the conveying pipe by using a gunny bag in summer construction, and watering and cooling;
The pipe clamp supporting structure is arranged at the joint of the conveying pipe, the machine-made sand concrete is guided into the conveying pipe by adopting the output pump pipe, when the flow at the outlet is reduced sharply, layering dryness or blockage is generated, and the like, the servo motor is started to drive the input pipe clamp to rotate to generate torque, the torque is transmitted to the oval pipe I through the pinhole flange ring, the torque is transmitted to the oval pipe II and the oval pipe III through the non-hole flange ring, the torsion is transmitted to the joint elbow structure in a torsion deformation mode, the whole torque is caused, the vector torsion type stirring process is realized, cement mortar can be fully stirred in the joint elbow, the risk of pipeline blockage caused by layering, precipitation and even dryness of the cement mortar at the joint is avoided, and the power input through the pipe clamp supporting structure is realized, so that the dredging process at the joint of the conveying pipe is realized;
e. The machine-made sand concrete is vibrated, namely mechanical vibration is adopted when the machine-made sand concrete is conveyed to the site, the vibration time of each vibration point is controlled to be 20-30 s according to different conditions such as the consistency of a mixture, the vibration position and the like, the machine-made sand concrete is easy to liquefy and isolate compared with natural sand concrete with the same slump by taking the concrete as the degree of non-sinking, non-bubbling, flat surface and floating slurry, and excessive vibration or leakage vibration is avoided;
f. Curing the machine-made sand concrete, namely after field vibration, the machine-made sand concrete should strengthen early-stage moisture curing, the exposed surface should adopt water-retaining curing, spraying and even sprinkling curing can be adopted after the mold is removed, the curing time should be not less than 7d, and the machine-made sand concrete should not be directly watered when the environmental temperature is lower than 5 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention provides a pipe clamp supporting structure, which is used for solving the problem that the joint of the existing long-distance pumping pipeline is easy to block, and comprises a twisted and deformed joint bent pipe structure formed by an input pipe clamp, a transition pipe clamp and an output pipe clamp, wherein the input pipe clamp and the external force gear drive can rotate the input pipe clamp and the elliptical pipe I to cause whole torque transmission when in use, cement mortar can be fully stirred in the joint bent pipe, the risk of pipeline blocking caused by layering, precipitation and even drying of the cement mortar at the joint is avoided, and the power input through the pipe clamp supporting structure is achieved, so that the dredging process of the joint of the conveying pipe is realized.
2. Aiming at the problem that the existing long-distance pumping pipeline node is easy to block, the invention also provides a screening and mixing process of a machine-made sand concrete formula, and provides different transportation, pumping, vibrating and maintenance schemes aiming at the special formula, so as to form a unique construction method, and the construction method researches the influence of machine-made sand powder on a concrete mixture through experimental analysis, so as to prepare the concrete which meets the design specified strength and durability and meets the pumpability requirement of the machine-made sand.
3. The construction method of the invention ensures that the concrete mixture fills the pipe and is easy to flow by a series of measures of prolonging the stirring time of the machine-made sand concrete, reasonably controlling the sand rate and controlling the stone powder content, has enough cohesiveness, and does not segregate or bleed in the pumping process.
4. According to the construction method, a pipeline cleaning waste recycling technology is adopted, when pumping is about to end, 2-3 m mortar is pumped, concrete is ejected, mortar is ejected by pumping water, the mortar is pumped into a waste mortar box, water and part of sand and stone participated in a pipe flow back to a pump truck along with the water, and the filtered sand and stone are transported back to a concrete supply station, so that natural resources are saved, a site cleaning effect is maintained, and the environment-friendly construction requirement is met.
5. The invention combines the two aspects of regulation of the formulation and the pumping structure of the machine-made sand concrete to improve a plurality of problems of the long-distance pumping pipeline technology, thoroughly solves the long-distance pumping problem of the concrete, is particularly suitable for the construction process of the machine-made sand concrete with the pumping distance of more than 300 meters, and is worth popularizing.
Drawings
FIG. 1 is a schematic view of a pipe clamp support structure according to the present invention;
FIG. 2 is a schematic diagram illustrating the gear connection of an input pipe strap in the pipe strap support structure according to the present invention;
FIG. 3 is a schematic view illustrating connection of a circular support ring in a pipe clamp support structure according to the present invention;
fig. 4 is a schematic diagram of an assembly structure of a fitting of the node elbow structure of the present invention.
In the figure, a supporting table 1, a first hydraulic rod 2, a second hydraulic rod 3, a servo motor 4, an arc chute 5, an input pipeline 6, a driving shaft 7, a driving gear 8, a gear ring 9, an input pipe clamp 10, angle irons 101, annular bar blocks 102, annular clamping grooves 103, flange holes 104, an oval material pipe I11, a non-porous flange ring 12, a pinhole flange ring 13, an output pipeline 14, an output pipe clamp 15, a transition pipe clamp 16, a circular supporting ring 17, a spring rod 18, a horizontal fixing rod 19, an inclined swinging rod 20, a third hydraulic rod 21, an oval material pipe II 22 and an oval material pipe III33.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-4, a pipe clamp supporting structure comprises a supporting table 1 arranged below a pumping pipeline node, a first hydraulic rod 2 and a second hydraulic rod 3 are vertically arranged on the upper surface of the supporting table 1, a servo motor 4 is fixedly connected to the top end of the first hydraulic rod 2, an arc chute 5 is fixedly connected to the top of a shell of the servo motor 4, a groove part on the upper surface of the arc chute 5 is in sliding fit with the lower part of the pipe wall of an input pipeline 6, a driving shaft 7 is arranged on the servo motor 4, a bearing seat which is in sleeve joint fit with the driving shaft 7 is arranged on the top end of the second hydraulic rod 3, a driving gear 8 is fixedly connected to the middle part of the driving shaft 7, a gear ring 9 is meshed with the driving gear 8, and the gear ring 9 is fixedly arranged on the outer ring of the input pipe clamp 10; the input pipeline 6 is connected with an elliptical material pipe I11 through an input pipe clamp 10, one end of the input pipeline 6, which is close to the elliptical material pipe I11, is provided with a non-hole flange ring 12, one end of the elliptical material pipe I11, which is close to the input pipeline 6, is provided with a pin hole flange ring 13, the input pipe clamp 10 consists of angle irons 101 at two ends and a middle annular bar 102, the two angle irons 101 of the input pipe clamp 10 are connected in a fitting way through fastening bolts, the inner cambered surface of the annular bar 102 of the input pipe clamp 10 is provided with two groups of annular clamping grooves 103, one group of annular clamping grooves 103 is in sleeved fit with the non-hole flange ring 12, the other group of annular clamping grooves 103 is in sleeved fit with the pin hole flange ring 13, the annular bar 102 of the input pipe clamp 10, which is close to the input pipeline 6, is provided with a flange hole 104, the pin hole flange ring 13 at one end of the elliptical material pipe I11 is fixed in the flange hole 104 through fastening bolts, the ring gear 9 is fixed on the outer ring of the annular bar 102 of the input pipe clamp 10, the output pipeline 14 is connected with an elliptical material pipe II22 at the tail through an output pipe clamp 15, the output pipeline 14 is also provided with a hole-free flange ring 12 near one end of the oval pipe II22, the output pipe clamp 15 is also composed of angle irons 101 at two ends and an annular strip block 102 in the middle, the two angle irons 101 of the output pipe clamp 15 are connected in a fit manner through fastening bolts, the inner cambered surface of the annular strip block 102 of the output pipe clamp 15 is provided with two groups of annular clamping grooves 103, one group of annular clamping grooves 103 is sleeved and matched with the hole-free flange ring 12, the other group of annular clamping grooves 103 is sleeved and matched with the pin hole flange ring 13, the annular strip block 102 of the output pipe clamp 15 is not provided with a hole near one end face of the output pipeline 14, the annular strip block 102 of the output pipe clamp 15 is provided with a flange hole 104 near one end face of the oval pipe II22, the pin hole flange ring 13 at one end of the oval pipe II22 is fixed in the flange hole 104 through fastening bolts, 2-13 groups of the oval pipe II are arranged between the oval pipe I11 and the oval pipe II22, 2-13 groups of oval pipe III33 are arranged between the oval pipe I11 and the oval pipe II22, and the vertical sections of 2-13 groups of oval pipe III33 are oval pipe III, The two end inclined cross sections are right circular, the inclined cross sections at the two ends are symmetrically arranged, the two ends of the oval material pipe III33 are respectively provided with a hole-free flange ring 12, the hole-free flange rings 12 are fixedly arranged at the inclined cross sections, a transition pipe clamp 16 is arranged between the adjacent hole-free flange rings 12, the transition pipe clamp 16 is also composed of angle irons 101 at the two ends and a middle annular bar 102, the two angle irons 101 of the transition pipe clamp 16 are connected by fastening bolts in a fit manner, the inner cambered surface of the annular bar 102 of the transition pipe clamp 16 is provided with two groups of annular clamping grooves 103 which are sleeved and matched with the pin hole flange ring 13, the outer wall of the oval material pipe III33 at the middle is sleeved with a circular supporting ring 17, the bottom of the outer ring of the circular supporting ring 17 is fixedly connected with a spring rod 18, one end, far away from the circular supporting ring 17, of the spring rod 18 is riveted with a horizontal fixing rod 19 and an inclined swinging rod 20, one end, far away from the spring rod 18, of the horizontal fixing rod 19 is vertically fixedly connected with a movable rod section of the second hydraulic rod 3, one end, far away from the spring rod 18, of the horizontal swinging rod 20 is vertically fixedly connected with the outer ring of the annular bar 102 of the output pipe clamp 15, the horizontal fixing rod 19, a third hydraulic rod 21 is riveted between the horizontal fixing rod 19 and the inclined swinging rod 20, and the third hydraulic rod 21 the tilt lever 20 and the third hydraulic lever 21 form a deformable triangle.
Referring to fig. 4, the inner side walls of the annular clamping grooves 103 of the input pipe clamp 10, the transition pipe clamp 16 and the output pipe clamp 15 are all subjected to smooth treatment, and the non-porous flange ring 12 and the pin hole flange ring 13 are all subjected to smooth treatment, so that water tightness is ensured, and a large amount of muddy water is prevented from penetrating into the gaps of each pipe clamp.
Referring to fig. 4, sealing rubber rings are arranged between adjacent non-porous flange rings 12 in a cushioning manner, so that friction force and cushioning property are improved, and torque force transmission efficiency between the transition pipe clamps 16 is facilitated.
Referring to fig. 4, a smooth sealing piece is interposed between the imperforate flange ring 12 and the pinhole flange ring 13 to improve the sealability and abrasion damage resistance of the input pipe clamp 10 and the output pipe clamp 15.
Referring to fig. 1, the servo motor 4 is specifically a forward and reverse low-speed motor, the oval material pipe I11, the oval material pipe II22 and the oval material pipe III33 form a node elbow capable of twisting, when in use, the servo motor 4 is rotated forward for half a circle and then rotated backward for half a circle, and the forward rotation and the backward rotation are alternately performed, so that torque transmission among the oval material pipe I11, the oval material pipe II22 and the oval material pipe III33 is realized, a vector twisting type stirring process is realized, cement mortar can be fully stirred in the node elbow, and the risk of pipeline blockage caused by layering, precipitation and even drying of the cement mortar at the node is avoided.
Based on the pipe clamp supporting structure, the invention also provides a construction method for long-distance pumping machine-made sand concrete, which comprises the following steps:
a. screening machine-made sand concrete raw materials, namely screening a proper amount of cement, water, fly ash, machine-made sand, broken stone and additives according to strength requirements, wherein the machine-made sand is specifically fine aggregate crushed by limestone or granite through a machine, the cement adopts silicate cement, the stone powder content in the machine-made sand is 0-20%, and the water reducing rate of the broken stone and the fly ash without alkali active additives is not suitable to be less than 16%;
b. According to the strength requirement, the optimal stone powder content in the machine-made sand used by the C30 machine-made sand concrete is 10% -15%, the optimal stone powder content in the machine-made sand used by the C40 machine-made sand concrete is 5% -12%, the optimal stone powder content in the machine-made sand used by the C50 machine-made sand concrete is 5% -7%, the optimal stone powder content in the machine-made sand used by the C60 machine-made sand concrete is not more than 5%, and the sand rate is improved by 2% -4% compared with natural sand;
c. B, transporting the machine-made sand concrete, namely placing all raw materials of the machine-made sand concrete in the step b into a stirrer in a transport vehicle by adopting a high-pressure pump, continuously stirring at a speed of 1-3 revolutions per minute in the transport process, and discharging after stirring by a stirring cylinder for 1-2 minutes before transporting to a site for discharging;
d. pumping machine-made sand concrete, namely paving a conveying pipe, namely paving straight, short and flat conveying pump inlet horizontal pipes by at least 15m, fixing the conveying pipe every 3m, covering the conveying pipe by using a gunny bag in summer construction, and watering and cooling;
the pipe clamp supporting structure is arranged at the joint of the conveying pipe, the machine-made sand concrete is guided into the conveying pipe by adopting an output pump pipe, when the flow rate at the outlet is reduced sharply, layering dryness or blockage is generated, and the like, the servo motor 4 is started to drive the input pipe clamp 10 to rotate to generate torque, the torque is transmitted to the oval pipe I11 through the pinhole flange ring 13, the torque is transmitted to the oval pipe II22 and the oval pipe III33 through the non-hole flange ring 12, the pipe is of a torsion deformed joint bent pipe structure, the whole torque is caused, the vector torsion type stirring process is realized, cement mortar can be fully stirred in the joint bent pipe, the risk of pipeline blockage caused by layering, sedimentation and even drying of the cement mortar at the joint is avoided, and the power input through the pipe clamp supporting structure is realized, so that the dredging process at the joint of the conveying pipe is realized;
e. The machine-made sand concrete is vibrated, namely mechanical vibration is adopted when the machine-made sand concrete is conveyed to the site, the vibration time of each vibration point is controlled to be 20-30 s according to different conditions such as the consistency of a mixture, the vibration position and the like, the machine-made sand concrete is easy to liquefy and isolate compared with natural sand concrete with the same slump by taking the concrete as the degree of non-sinking, non-bubbling, flat surface and floating slurry, and excessive vibration or leakage vibration is avoided;
f. Curing the machine-made sand concrete, namely after field vibration, the machine-made sand concrete should strengthen early-stage moisture curing, the exposed surface should adopt water-retaining curing, spraying and even sprinkling curing can be adopted after the mold is removed, the curing time should be not less than 7d, and the machine-made sand concrete should not be directly watered when the environmental temperature is lower than 5 ℃.
Technological principle of machine-made sand concrete:
1. Referring to table 1, as the stone dust content in the machine-made sand increases, the bleeding segregation problem of the corresponding pumped concrete no longer occurs, the workability is remarkably improved, and the slump is also greatly improved. However, the optimal control amount of the stone powder content in the machine-made sand is about 10 percent, once the content of the stone powder is more than 15 percent, the water quantity of the pumped concrete is increased, the slump of the pumped concrete is obviously reduced, the strength of the pumped concrete is improved to a certain extent by increasing the stone powder content, and the strength value of the pumped concrete is reduced if the content is too high, mainly because the early stage of hydration of the cement plays a role in nucleation of C-S-H and calcium hydroxide, the early stage strength of the cement is changed, and the stacking density of machine-made sand particles is improved, so that the strength of the pumped concrete formed by the machine-made sand can be improved. If the stone powder content in the machine-made sand is relatively large, the most dense stacking structure in the concrete is damaged, the cement-bone ratio of the concrete is affected, and the strength value of the concrete is reduced, and along with the continuous increase of the stone powder content in the machine-made sand, the corresponding dryness of the pumped concrete is presented as a change trend of decreasing before increasing, because the stone powder in the machine-made sand contains a plurality of fine particles with filling effect, the tortuosity degree of capillary holes of the concrete is increased, and the pore structure of the concrete is thinned, so that the dryness of the pumped concrete formed by the stone powder can be inhibited to a certain extent by using the stone powder in a proper amount. Therefore, the stone powder content in the corresponding machine-made sand is properly controlled to be about 10 percent in the machine-made sand concrete mixing process, the workability of the machine-made sand can be effectively improved, the compressive strength of the concrete mixed by the machine-made sand is improved, and the drying shrinkage performance of the concrete is reduced, so that the machine-made sand concrete meeting the concrete pumping requirement can be mixed.
TABLE 1 influence of stone dust content on the performance of concrete mixes of different strength classes
2. Referring to table 2, since the machine-made sand is affected by the production equipment and the parent rock material, the grain is coarse, generally medium coarse sand, if the sand rate is too small, the configured concrete is coarse, bleeding, segregation, stirring, vibrating and pumping are easy to occur, the poured concrete is easy to generate honeycomb pitting surface, the surface is more air bubbles and is not smooth, if the sand rate is too large, the concrete strength is too low and uneven, the shrinkage is large, cracks are easy to occur on the surface, and the effect of improving the sand rate by 2-4% is optimal when the machine-made sand concrete with the same water-cement ratio as the natural sand concrete is configured through multiple experiments.
TABLE 2 selection of machine-made sand concrete sand fractions at different water-cement ratios
The quality control standard of the machine-made sand concrete in the invention is that the construction method mainly conforms to the current regulations, regulations and standards of execution, and mainly comprises the following steps:
1 < premixed concrete > GB/T14202,
2 "Construction Sand" GB/T14684,
3 Specification for concrete Structure design GB 50010,
4 Standard for Performance test of common concrete mixture GB/T50080,
5 GB/T50081 of ordinary concrete mechanical property test method Standard,
6 Standard for testing the Long-term Performance and durability of common concrete GB/T50082,
7 Concrete quality control Standard GB 50164,
8 'Concrete structure engineering construction quality acceptance Specification' GB 50204,
9 GB/T50476 of concrete Structure durability design Specification,
10 Concrete construction Specification GB 50666,
11 Concrete pumping construction technical regulations JGJT 10,
12J 52, standard for quality and inspection method of sand and stone for ordinary concrete,
13 General concrete mix design rules JGJ 55,
14 Manual sand concrete application technical Specification JGJ/T241,
15 GB/T50107 of concrete strength test and evaluation Standard,
16 JTG E42, highway engineering aggregate test procedure,
17 JTG/T B07-01, technical regulations for anti-corrosion of highway engineering concrete structure,
18 JTG/T F50 0 of technical Specification for road bridge and culvert construction,
19J-JTG/T F & lt 60 & gt,
20 JTG F80-1, highway engineering quality inspection and assessment Standard.
The quality assurance measures of the machine-made sand concrete comprise:
1. the metering precision is strictly controlled;
2, increasing the grain composition, fineness modulus and detection frequency of stone powder content (containing methylene blue test) of the machine-made sand;
3, when the machine-made sand and coarse aggregate are piled and taken, measures are taken to prevent segregation;
4, strictly measuring the water content of the machine-made sand and the coarse aggregate, and timely adjusting the weighing of the machine-made sand, the coarse aggregate and the mixing water according to the water content change so as to ensure the consistency of the laboratory mixing proportion and the construction mixing proportion of the concrete;
When 5 machine-made sand concrete is stirred, when the machine-made sand powder content, MB value change are large, sand rate and water reducer dosage should be adjusted timely, and concrete mixing fluidity and workability are ensured to be good.
And 6, adopting machine-made sand concrete transported by a stirring transport vehicle, and after the machine-made sand concrete reaches the site, rotating at a high speed for 20 seconds to stir uniformly, when the slump loss is large and the construction requirement cannot be met, adding a proper amount of water reducer with the same component as the original blending ratio into a transport vehicle tank, rapidly rotating and stirring uniformly, pumping or pouring after the required working performance is achieved, wherein the adding amount of the water reducer is determined by a test in advance and recorded.
The grain composition of the machine-made sand is large in fluctuation, segregation and layering of a machine-made sand concrete mixture are easy to be aggravated by jolting and the like in the transportation process, and the stirring tank is required to continuously stir at a slow speed of 2-4 r/min in the concrete transportation process. Before the concrete is discharged, the stirring tank can discharge the concrete by adopting a rapid gear high-speed rotation for more than 30 seconds, so that the concrete is ensured not to be layered and isolated. The time from the machine-made sand concrete discharging to the pouring and molding is not longer than the initial setting time of the machine-made sand concrete.
8, Due to poor workability of the machine-made sand concrete, the machine-made sand concrete of the vertical component is evenly distributed in a layering manner when being poured, and the layering thickness is reduced to 300-400 mm from 500mm specified by the natural sand concrete.
And 9, adopting machine-made sand concrete for pumping construction, wherein the transportation of the machine-made sand concrete can ensure the continuous pumping of the concrete and meet the specification of JGJ/T10 of the current industry standard concrete pumping construction technical regulations.
10. The machine-made sand concrete should adopt mechanical vibration, the vibration time of each vibration point is controlled to be 20 s-30 s according to different conditions such as the consistency of the mixture and the vibration position, so that the surface of the concrete mixture is smooth and the degree of no bubble overflow is basically achieved, and vibration and lack of vibration are strictly forbidden.
The 11 machine-made sand concrete should strengthen early moisture maintenance, the exposed surface should adopt water retention maintenance, spray and even sprinkling maintenance after removing the mould, the maintenance time should be not less than 7d, the winter construction machine-made sand concrete should not be directly watered when the environmental temperature is lower than 5 ℃.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
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