A multi-sleeve synchronous grouting device and its sleeve grouting method

Abstract

The present invention discloses a multi-sleeve synchronous grouting device and a sleeve grouting method thereof, belonging to the technical field of sleeve grouting. The device includes a grouting machine, and the slurry outlet of the grouting machine is communicated with a variable-diameter multi-way branch pipe mechanism. At least two branch hoses are communicated with the main slurry inlet pipe of the variable-diameter multi-way branch pipe mechanism through sub-channels. The diameters of each of the branch hoses are the same and smaller than the diameter of the main slurry inlet pipe. Each branch hose is communicated with the slurry inlet of the sleeve at intervals of multiple sleeves to be grouted. The multi-sleeve synchronous grouting device and the sleeve grouting method thereof of the present invention can improve the efficiency of synchronous sleeve grouting and are simple and convenient to operate.

Description

Technical Field

[0001] The present invention belongs to the technical field of grouting for grouting sleeves, and particularly relates to a multi-sleeve synchronous grouting device and a sleeve grouting method thereof. Background Technique

[0002] According to the "Technical Specification for Application of Reinforced Steel Sleeve Grouting Connection", when grouting sleeves are used in prefabricated assembled structures, there are mainly two construction techniques for sleeve grouting construction. One is the connected cavity grouting method, and the other is the method of grouting one by one after placing mortar (hereinafter referred to as the mortar placing method), which is similar to the single-channel grouting method. The connected cavity grouting method means that after the vertical precast component is hoisted in place, the bottom end cavity around the component is sealed with a sealing material, or divided into multiple sections and sealed separately, so that the lower openings of multiple grouting sleeves are connected to the same cavity. During grouting, grouting is simultaneously carried out into multiple grouting sleeves through the bottom end cavity of the component. The current national relevant standards recommend the use of the connected cavity grouting process for the vertical steel bar sleeve grouting construction of precast shear walls, as Figure 1 shown.

[0003] However, in the connected cavity grouting process, the flow path of the grouting material in the connected cavity is too long, and the water in the grouting material is likely to be lost and blocked. At the same time, if a blockage occurs, the entire connected cavity cannot observe the blockage position. Regarding the importance of the grouting process of the grouting sleeve to the connection performance of the grouting sleeve, Ma Cong et al. studied and proposed the specific construction points of the self-weight filling grouting method and the pumping filling grouting method, and explained that when the grouting material is mixed and stirred, the appropriate range of the slump of the grouting material is 127-165 mm. If it is too small, the strength is insufficient; if it is too high, it is difficult to pump the grouting material. In addition, under the condition of 10-27 °C, the performance of the grouting material is relatively high, the setting is good, and the tensile strength of the steel bar sleeve connection system can meet the requirements. The plugging operation of the grouting hole and the slurry outlet hole directly affects the grouting fullness. When the precast component enters the site for acceptance, the sleeve is inspected for water permeability to check its smoothness, and the sleeve is prevented from being blocked by sundries during the mortar placing, joint plugging, hoisting and other processes. Before grouting, a ventilation check is carried out to detect blockage problems in the sleeve, the slurry outlet hole and the grouting hole itself.

[0004] Previous studies of this kind have raised many problems with existing grouting construction. The traditional single-channel grouting has low efficiency, the problem of blockage caused by water loss of the grouting material in the connected cavity grouting, the accurate calculation of the amount of grouting material for self-weight filling grouting and the difficulties in construction, etc. All in all, it is ultimately the influence of the grouting speed and the internal problems of the sleeve on the grouting density and efficiency of the sleeve. If the grouting speed is too fast, the grouting material will flow too fast inside the sleeve and air bubbles will be generated. Therefore, most traditional grouting constructions cannot adopt a relatively high grouting pressure / rotation speed. On the other hand, under high pressure / rotation speed, the single-channel grouting pipeline requires high strength, and at the same time, the cost of the material that meets its flexibility is relatively high. According to the above description, if a relatively low grouting pressure / rotation speed is adopted, the grouting construction efficiency will be greatly reduced, aiming at the contradiction between the grouting efficiency and the grouting density of the grouting sleeve. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a multi-sleeve synchronous grouting device and a sleeve grouting method thereof, which can improve the sleeve synchronous grouting efficiency and are easy to operate.

[0006] To achieve the above purpose, the present invention is implemented by the following technical solutions:

[0007] In the first aspect, the present invention provides a multi-sleeve synchronous grouting device, including a grouting machine. The slurry outlet of the grouting machine is connected to a variable-diameter multi-way branch pipe mechanism. At least two branch hoses are connected to the main slurry inlet pipe of the variable-diameter multi-way branch pipe mechanism in a sub-channel manner. The diameters of each branch hose are the same and smaller than the diameter of the main slurry inlet pipe. Each branch hose is connected to the slurry inlet of the sleeve at intervals of multiple sleeves to be grouted.

[0008] Further, the variable-diameter multi-way branch pipe mechanism includes a first variable-diameter three-way pipe and two branch hoses. The middle slurry inlet pipe of the first variable-diameter three-way pipe is connected to the slurry outlet of the grouting machine. The two slurry outlet pipes on both sides of the first variable-diameter three-way pipe are respectively connected to the branch hoses. The cross-sectional area of the middle slurry inlet pipe of the first variable-diameter three-way pipe is 1.5-2.5 times that of the slurry outlet pipes on both sides, and the diameter of the slurry outlet pipe is equal to the diameter of the branch hose.

[0009] Furthermore, the variable-diameter multi-way pipe mechanism includes a second variable-diameter three-way pipe, two first variable-diameter three-way pipes, and four branch hoses. The middle slurry inlet pipe of the second variable-diameter three-way pipe is connected to the slurry outlet of the grouting machine. The two slurry outlet pipes on both sides of the second variable-diameter three-way pipe are respectively connected to the middle slurry inlet pipe of one of the first variable-diameter three-way pipes. The two slurry outlet pipes on both sides of the first variable-diameter three-way pipe are respectively connected to a branch hose. The cross-sectional area of the middle slurry inlet pipe of the second variable-diameter three-way pipe is 1.5 to 2.5 times that of the slurry outlet pipes on both sides. The diameters of the slurry outlet pipes on both sides of the second variable-diameter three-way pipe are equal to the diameter of the middle slurry inlet pipe of the first variable-diameter three-way pipe. The cross-sectional area of the middle slurry inlet pipe of the first variable-diameter three-way pipe is 1.5 to 2.5 times that of the slurry outlet pipes on both sides, and the diameter of the slurry outlet pipe is equal to the diameter of the branch hose.

[0010] Furthermore, the diameter of the middle slurry inlet pipe of the first variable-diameter three-way pipe is 25 mm, the diameters of the slurry outlet pipes on both sides of the first variable-diameter three-way pipe are 20 mm, and the diameter of the branch hose is 20 mm.

[0011] Furthermore, the diameter of the middle slurry inlet pipe of the first variable-diameter three-way pipe is 25 mm, the diameters of the slurry outlet pipes on both sides of the first variable-diameter three-way pipe are 20 mm, and the diameter of the branch hose is 20 mm;

[0012] The diameter of the middle slurry inlet pipe of the second variable-diameter three-way pipe is 40 mm, and the diameters of the slurry outlet pipes on both sides of the second variable-diameter three-way pipe are 25 mm.

[0013] Furthermore, a PVC outlet pipe is connected to the slurry outlet of the branch hose. A preset slurry inlet pipe with a larger inlet diameter, a smaller outlet diameter, and a gradually decreasing diameter in the middle is connected between the PVC connecting pipe and the slurry inlet of the sleeve. A transparent connecting hose is connected to the inlet of the preset slurry inlet pipe to connect the PVC outlet pipe at the slurry outlet of the branch hose. The outlet of the preset slurry inlet pipe is provided with an external thread, which is matched with the internal thread in the slurry inlet of the sleeve, and a switch valve is arranged between the inlet and the outlet of the preset slurry inlet pipe.

[0014] Furthermore, the second variable-diameter three-way pipe and the first variable-diameter three-way pipe, and the first variable-diameter three-way pipe and the branch hose are all connected by a turning pipe with a right angle and a 1 / 4 arc.

[0015] Furthermore, the first variable-diameter three-way pipe, the second variable-diameter three-way pipe, and the turning pipe with a right angle and a 1 / 4 arc are all made of PVC pipes with a certain hardness.

[0016] Furthermore, the rotation speed of the grouting machine is adjustable to control the grouting flow rate.

[0017] Second aspect, a sleeve grouting method based on the multi-sleeve synchronous grouting device described in any one of the first aspects, comprising the following steps:

[0018] First step: Connect the slurry inlet of the reduced-diameter multi-way pipe mechanism to the slurry outlet of the grouting equipment, and firmly fix the joint with a fixed clamp;

[0019] Second step: Connect the grouting device to the water supply equipment, start the water switch of the control equipment, and clean the grouting device and the reduced-diameter multi-way pipe mechanism until it is clean;

[0020] Third step: Connect the bottom sleeve (straight pipe part) with a grout stop valve to the grouting sleeve inlet with a threaded end, and connect another top sleeve with a grout stop valve (with a threaded end to the outlet of the grouting sleeve, so that the overflow port of the sleeve extends obliquely upward at an angle of 135°;

[0021] Fourth step: Connect the slurry outlet of the reduced-diameter multi-way pipe mechanism to the slurry inlet of the bottom sleeve with a grout stop valve, clamp the connection part with a clip, and at the same time check whether all connection parts are firm. Then start the control equipment to wash the grouting sleeve with water to ensure that there is no blockage inside the grouting sleeve;

[0022] Fifth step: Disconnect the connection end of the slurry outlet of the reduced-diameter multi-way pipe mechanism from the bottom sleeve with a grout stop valve. Pour the grouting material and tap water into the mixing slurry device of the grouting equipment according to the ratio required by the construction plan, start the mixing device to mix. After mixing is in place, start the grouting equipment to input the grouting material into the reduced-diameter multi-way pipe mechanism; when the slurry outlets of each branch hose of the reduced-diameter multi-way pipe mechanism discharge slurry evenly, at the same time connect each slurry outlet to the slurry inlet of the corresponding bottom sleeve of the grouting sleeve with a grout stop valve, and clamp it with a clip. Among them, under the condition of the same grouting equipment, the grouting revolution speed for single-channel grouting should be controlled at about 40 r / min; the grouting revolution speed for two-channel grouting should be controlled at about 80 r / min; the grouting revolution speed for two-channel grouting should be controlled at about 160 r / min;

[0023] Sixth step: For multi-channel grouting, each grouting is for the grouting sleeves in the same row to grout in sequence and each branch hose is at least 2 - 3 grouting sleeves apart for grouting construction. When the grouting sleeves corresponding to each branch hose are filled, they are all shifted in sequence at intervals of 2 - 3 grouting sleeves in the same order and direction;

[0024] Step 7: After the top sleeve with the grout stop valve discharges grout evenly, close the grout stop valve. After all the grouting sleeves are filled this time, control the rotation speed of the grouting device to decrease. At the same time, close the grout stop valve of the bottom sleeve with the grout stop valve, and loosen the clamp at the connection end between the slurry outlet of the branch hose of the variable-diameter multi-way branch mechanism and the grout inlet of the bottom sleeve with the grout stop valve. At the same time, orderly connect the variable-diameter multi-way branch mechanism to the grout connection end of the bottom sleeve with the grout valve of the next group of several grouting sleeves.

[0025] Step 8: Repeat the above Steps 5 / 6 / 7 until all the grouting sleeves are filled.

[0026] Step 9: During the grouting process, pay attention to observing the grout in the top sleeve with the grout stop valve of all the filled grouting sleeves. If the grout shows a downward trend, replenish the grout in a timely manner;

[0027] Step 10: Separate the variable-diameter multi-way branch mechanism from all the grouting sleeves. At this time, use the remote control device to turn on the water equipment of the grouting machine to clean the variable-diameter multi-way branch mechanism and the grouting device until they are clean.

[0028] Step 11: The grouting is completed.

[0029] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0030] The multi-sleeve synchronous grouting device and the sleeve grouting method provided by the present invention adopt a variable-diameter multi-way branch mechanism to divide the channels into multiple branch hoses and then connect them to the grout inlets of the sleeves. At the same time, the principle of fluid mechanics is used to control the diameters of each section of the pipeline in the variable-diameter multi-way branch mechanism to keep the slurry flow rate unchanged when the grout reaches the slurry outlet of the branch hose, ensuring the grout flow rate inside the sleeve to ensure the grouting density. At the same time, the grouting slurry is configured to be split into multiple channels through the variable-diameter multi-way branch mechanism at a high flow rate to improve the efficiency. Moreover, the synchronous grouting construction method uses the device to grout every multiple (such as 2 - 3) grouting sleeves at intervals of each branch, which better solves the problem of branch hose intersection during the pipe replacement of these 2 - 3 channels. At the same time, the grouting process is clearer, which is conducive to improving the proficiency of workers in actually operating the multi-channel synchronous grouting device for grouting, and further improving the grouting efficiency.

[0031] At the joints of the PVC pipes, PVC glue is used for bonding, and at the joints of the PVC pipes and the hoses, manual tightening clamps are used, which are convenient for disassembly and have a firm connection. During pipe replacement, only the clamp needs to be loosened, making it easy for workers to operate during construction. The end of the preset grout inlet pipe is provided with threads, which can be screwed and connected to the grout inlet of the embedded grouting sleeve, with a firm and reliable connection; a valve is provided on the preset grout inlet pipe to stop the grout at any time. After the grouting is completed, it can also be used to block the grout inlet to prevent the grout from flowing back and generating grouting cavity defects, ensuring the quality of the grouting construction. Description of the Drawings

[0032] Figure 1 It is a grouting process diagram for a connected cavity;

[0033] Figure 2 It is a grouting schematic diagram of the multi-channel synchronous grouting device proposed in this patent;

[0034] Figure 3 It is a structural schematic diagram of the 2-channel synchronous grouting device proposed in this patent;

[0035] Figure 4 It is a structural schematic diagram of the 4-channel synchronous grouting device proposed in this patent;

[0036] Figure 5 It is an enlarged schematic diagram at location A (the connection between the variable-diameter multi-way branch pipe mechanism and the preset grouting inlet pipe).

[0037] Figure 6 It is a schematic diagram of the internal structure of the grouting machine.

[0038] In the figure:

[0039] 1. Grouting machine; 101. Rotation digital display screen; 102. Grouting machine control panel; 103. Stirring barrel; 104. Water storage tank; 105. Water inlet valve of the water storage tank; 106. Grouting machine; 107. External water source; 2. Grouting injection port of the grouting machine; 3. Variable-diameter multi-way branch pipe mechanism; 301. Second variable-diameter three-way pipe; 302. Clamp; 303. 20mm right-angle pipe with 1 / 4 arc turning pipe; 304. Branch hose; 305. PVC outlet pipe; 306. Welding joint of the connecting hose and the PVC outlet pipe; 307. 25mm diameter right-angle pipe with 1 / 4 arc turning pipe; 308. First variable-diameter three-way pipe; 4. Preset inlet pipe; 401. External thread; 402. Valve; 403. Middle pipe diameter decreasing transition section; 404. Connecting hose; 405. Clamp; 406. Grouting sleeve inlet; 5. Sleeve; 6. Steel bar; 7. Grouting sleeve outlet; 8. Bridge pier column; 9. Water supply tank; 501. Upper component connecting steel bar; 502. Grouting material; 503. Grouting connection cavity; 504. Lower component connecting steel bar; 505. Sealing material; 506. Grouting sleeve. Specific implementation manners

[0040] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0043] Embodiment

[0044] As Figures 2 to 6 shown, in an embodiment of the present invention, a multi-sleeve synchronous grouting device is provided, which can be used for grouting construction when using grouting sleeves at the joints of precast assembled structural bridge piers and abutments, bridge pier body segments, and bridge piers and capping beams. The device includes a grouting machine 106, and the slurry outlet of the grouting machine 106 is communicated with a variable-diameter multi-way branch pipe mechanism 3. At least two branch hoses 304 are communicated with the main inlet pipe of the variable-diameter multi-way branch pipe mechanism 3 through sub-channels. The diameters of each branch hose 304 are the same and smaller than the diameter of the main inlet pipe. Each branch hose 304 is communicated with the slurry inlet of the sleeve at intervals of multiple sleeves to be grouted.

[0045] In some embodiments, for a two-channel grouting device and its process, the variable-diameter multi-way branch pipe mechanism 3 includes a first variable-diameter three-way pipe 308 and two branch hoses 304. The middle slurry inlet pipe of the first variable-diameter three-way pipe 308 is communicated with the slurry outlet of the grouting machine 106. The two slurry outlet pipes on both sides of the first variable-diameter three-way pipe 308 are respectively communicated with the branch hoses 304. The cross-sectional area of the middle slurry inlet pipe of the first variable-diameter three-way pipe 308 is 1.5 to 2.5 times that of the slurry outlet pipes on both sides, and the diameter of the slurry outlet pipe is equal to the diameter of the branch hose 304.

[0046] Specifically, the diameter of the middle slurry inlet pipe of the first variable-diameter three-way pipe 308 is 25 mm, the diameters of the two slurry outlet pipes on both sides of the first variable-diameter three-way pipe 308 are 20 mm, and the diameter of the branch hose 304 is 20 mm.

[0047] In some embodiments, for the four-channel grouting equipment and its process, the variable-diameter multi-branch pipe mechanism 3 includes a second variable-diameter three-way pipe 301, two first variable-diameter three-way pipes 308, and four branch hoses 304. The middle slurry inlet pipe of the second variable-diameter three-way pipe 301 is connected to the slurry outlet of the grouting machine 106. The two slurry outlet pipes on both sides of the second variable-diameter three-way pipe 301 are respectively connected to the middle slurry inlet pipe of a first variable-diameter three-way pipe 308. The two slurry outlet pipes on both sides of the first variable-diameter three-way pipe 308 are respectively connected to a branch hose 304. The cross-sectional area of the middle slurry inlet pipe of the second variable-diameter three-way pipe 301 is 1.5 to 2.5 times that of the two slurry outlet pipes on both sides. The diameters of the two slurry outlet pipes on both sides of the second variable-diameter three-way pipe 301 are equal to the diameter of the middle slurry inlet pipe of the first variable-diameter three-way pipe 308. The cross-sectional area of the middle slurry inlet pipe of the first variable-diameter three-way pipe 308 is 1.5 to 2.5 times that of the two slurry outlet pipes on both sides, and the diameter of the slurry outlet pipe is equal to the diameter of the branch hose 304.

[0048] Specifically, the diameter of the middle slurry inlet pipe of the first variable-diameter three-way pipe 308 is 25 mm, the diameters of the two slurry outlet pipes on both sides of the first variable-diameter three-way pipe 308 are 20 mm, and the diameter of the branch hose 304 is 20 mm; the diameter of the middle slurry inlet pipe of the second variable-diameter three-way pipe 301 is 40 mm, and the diameters of the two slurry outlet pipes on both sides of the second variable-diameter three-way pipe 301 are 25 mm.

[0049] Based on the derivation and analysis according to the continuity of fluid mechanics flow and combined with the actual situation, the derivation of each pipe diameter is as follows:

[0050] It is known that the diameter of the grouting sleeve slurry inlet 406 is close to the market PVC standard pipe diameter of 20 mm. The flow velocities and diameters of the middle feed pipe of the first variable-diameter three-way pipe 308 and the two discharge pipes / branch hoses 304 on both sides of the discharged slurry are V1, V2 and d1, d2 respectively. Assuming that the grouting flow velocity remains unchanged, the pipe diameter relationship is:

[0051] V1 / V2 = nd2 2 / d1 2 = 1

[0052] 2×20 2 / d1 2 = 1

[0053] d1≈28.28 mm

[0054] Similarly, the first variable-diameter three-way pipe 308 is connected to the second variable-diameter three-way pipe 301. The diameter of the middle feed pipe of the second variable-diameter three-way pipe 301 is d0. Assuming that the grouting flow rate remains unchanged, the diameter relationship is as follows:

[0055] V0 / V1 = nd1 2 / d0 2 = 1

[0056] d1 2 = 2d2 2

[0057] d0 ≈ 40mm

[0058] Select PVC pipe diameters close to 40mm, 25mm, and 20mm according to the market PVC pipe diameter specifications.

[0059] It should be noted that the multi-sleeve synchronous grouting device provided in the embodiment of the present invention can also be provided with grouting equipment in various forms such as eight channels according to the actual construction situation to meet the requirements of different construction sites.

[0060] In this embodiment, a flow splitting protrusion is provided at the connection between the middle slurry inlet pipe and the two side slurry outlet pipes of the first variable-diameter three-way pipe 308 and the second variable-diameter three-way pipe 301, which is convenient for reducing the head loss during the flow of the mortar and facilitating the uniform flow of the grouting slurry into the two side slurry outlet pipes.

[0061] A PVC outlet pipe 305 is connected to the slurry outlet of the branch hose 304. A preset slurry inlet pipe 4 with a large slurry inlet diameter, a small slurry outlet diameter, and a gradually decreasing middle diameter is connected between the PVC connecting pipe and the slurry inlet of the sleeve. A transparent connecting hose 404 is connected to the slurry inlet of the preset slurry inlet pipe 4, through which the fullness of the slurry inlet can be seen, and it is used to connect the PVC outlet pipe 305 at the slurry outlet of the branch hose 304. The length can be set to 10 cm. An external thread 401 is provided at the slurry outlet of the preset slurry inlet pipe 4, which is matched with the internal thread in the slurry inlet of the sleeve. A switch valve 402 is provided between the slurry inlet and the slurry outlet of the preset slurry inlet pipe 4.

[0062] The second variable-diameter three-way pipe 301 and the first variable-diameter three-way pipe 308, and between the first variable-diameter three-way pipe 308 and the branch hose 304 are all connected by a turning pipe with a right angle and a 1 / 4 arc. Specifically, the first variable-diameter three-way pipe 308, the second variable-diameter three-way pipe 301, and the turning pipe with a right angle and a 1 / 4 arc are all PVC pipes with a certain hardness. The PVC pipes are bonded with PVC glue. The PVC pipes and hoses are clamped and connected by clamps 302. The clamps 302 are equipped with manual knobs and can be manually rotated and tightened. The hoses have good toughness and strength.

[0063] Inside the grouting machine 106, there is a water storage tank 104 and a mixing barrel 103. Before and after grouting, the wetting and cleaning of the device can be controlled through the switch button. The mixing of grouting material, the start of grouting, and the grouting speed are all controlled by buttons. The grouting machine 106 has a rotation speed digital display screen 101, and the rotation speed can be accurately adjusted.

[0064] Next, in combination with the usage operation of specific embodiments, the working principle of the sleeve grouting method of the multi-sleeve synchronous grouting device of the present invention will be described.

[0065] The sleeve grouting method of the multi-sleeve synchronous grouting device includes the following steps:

[0066] First step: Connect the slurry inlet of the reducing multi-way pipe mechanism 3 to the slurry outlet of the grouting equipment, and firmly fix the joint with a fixing clip.

[0067] Second step: Connect the grouting device to the water supply equipment, start the water supply switch of the control equipment, and clean the grouting device and the reducing multi-way pipe mechanism 3 until it is clean.

[0068] Third step: Connect the bottom sleeve (straight pipe part) with a grout stop valve to the slurry inlet 406 of the grouting sleeve with the threaded end, and connect another top sleeve with a grout stop valve (with the threaded end connected to the slurry outlet of the grouting sleeve, so that the overflow port of the sleeve extends obliquely upward at an angle of 135°.

[0069] Fourth step: Connect the slurry outlet of the reducing multi-way pipe mechanism 3 to the slurry inlet of the bottom sleeve with a grout stop valve, clamp the connection part with a clip, and at the same time check whether all connection parts are firm. Then start the control equipment to wash the grouting sleeve with water to ensure that there is no blockage inside the grouting sleeve.

[0070] Fifth step: Disconnect the connection end of the slurry outlet of the reducing multi-way pipe mechanism 3 from the bottom sleeve with a grout stop valve. Pour the grouting material and tap water into the mixing slurry device of the grouting equipment according to the ratio required by the construction plan, start the mixing device to mix. After mixing is in place, start the grouting equipment to input the grouting material into the reducing multi-way pipe mechanism 3; when the slurry outlets of each branch hose 304 of the reducing multi-way pipe mechanism 3 evenly discharge slurry, simultaneously connect each slurry outlet to the slurry inlet of the corresponding bottom sleeve of the grouting sleeve with a grout stop valve, and clamp it with a clip.

[0071] Among them, under the condition of the same grouting equipment, for single-channel grouting, the grouting rotation speed should be controlled at about 40 r / min; for two-channel grouting, the grouting rotation speed should be controlled at about 80 r / min; for two-channel grouting, the grouting rotation speed should be controlled at about 160 r / min.

[0072] Step 6: For multi-channel grouting, each time of grouting is carried out in sequence for the grouting sleeves in the same row, and the grouting construction is carried out with at least 2 to 3 grouting sleeves spaced between each branch hose 304. After the grouting sleeves corresponding to each branch hose 304 are filled, they are all shifted in sequence at intervals of 2 to 3 grouting sleeves in the same order and direction;

[0073] Step 7: After the top sleeve with a grout stop valve uniformly discharges grout, close the grout stop valve. After all the grouting sleeves are filled this time, control and reduce the rotation speed of the grouting device. At the same time, close the grout stop valve of the bottom sleeve with a grout stop valve, and loosen the clamp at the connection end between the outlet of the branch hose 304 of the variable diameter multi-way branch mechanism 3 and the inlet of the bottom sleeve with a grout stop valve. At the same time, connect the variable diameter multi-way branch mechanism 3 to the grouting connection end of the bottom sleeve with a grout valve of the next group of several grouting sleeves in an orderly manner.

[0074] Step 8: Repeat the above steps 5 / 6 / 7 until all the grouting sleeves are filled.

[0075] Step 9: During the grouting process, pay attention to observing the grouting material in the top sleeve with a grout stop valve of all the filled grouting sleeves. If the grouting material shows a tendency to sink, supplementary grouting should be carried out in a timely manner;

[0076] Step 10: Disconnect the variable diameter multi-way branch mechanism 3 from all the grouting sleeves. At this time, use the remote control device to turn on the water-using equipment of the grouting machine 106 to clean the variable diameter multi-way branch mechanism 3 and the grouting device until they are clean.

[0077] Step 11: The grouting is completed.

[0078] Under the same conditions of the grouting machine 106, channel diameter, etc., compare the traditional single-channel grouting method and the multi-channel, variable diameter branch method of the multi-sleeve synchronous grouting device of the present invention.

[0079] The traditional grouting device uses single-channel grouting and continuously changes the pipe for grouting for each sleeve. According to on-site investigations, experimental phenomena, and test data results, the suitable grouting speed for the single channel is 40 r / min. In the multi-sleeve synchronous grouting device in the embodiment of the present invention, the suitable grouting speed for 2-channel grouting is 80 r / min, and for 4-channel grouting, the suitable grouting speed is 80 r / min. However, since the grouting speed has not reached the limit or the optimal value, the existing data grouting speed of 80 r / min is also adopted. The comparison of the grouting efficiency of the three is shown in Table 1 below.

[0080] Table 1 Comparison between the multi-sleeve synchronous grouting process and the traditional grouting process

[0081]

[0082]

[0083] As shown in Table 1, it should be noted that the existing grouting process mostly uses single-channel grouting, and its grouting speed is generally 25 r / min to 50 r / min. Considering comprehensively, the grouting speed is relatively low and the efficiency is low. However, limited by the traditional equipment conditions, when the grouting speed is too high, the grouting operation is not easy to operate, and there are bottleneck limitations in the room for improvement. Therefore, the research of the present invention proposes that the suitable grouting speed for single-channel grouting is 40 r / min.

[0084] In this embodiment, when the suitable grouting speed for two-channel grouting is 80 r / min, its grouting efficiency is increased by 43.27% compared with the suitable grouting speed of 40 r / min for traditional single-channel grouting. It can be seen that by using the multi-sleeve synchronous grouting device of the present invention, the grouting efficiency of the grouting sleeve construction of precast segmental bridge piers can be greatly improved for two-channel grouting. When the four channels use the same grouting speed of 80 r / min, the grouting efficiency is also increased by 42.31%, which also greatly improves the grouting efficiency. At the same time, the grouting speed of 80 r / min does not reach the limit grouting speed. Therefore, the two-channel and four-channel grouting not only greatly improve the efficiency, but also have good grouting stability, and are suitable for wide application in the grouting sleeve connection grouting process of precast segmental bridge piers.

[0085] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A multi-sleeve synchronous grouting device, comprising a grouting machine, characterized in that, The slurry outlet of the grouting machine is connected to a variable-diameter multi-way branch pipe mechanism. At least two branch hoses are connected in parallel to the main inlet pipe of the variable-diameter multi-way branch pipe mechanism. The diameter of each branch hose is the same and smaller than the diameter of the main inlet pipe. Each branch hose is connected to the slurry inlet of the sleeve at intervals of multiple sleeves to be grouted. Among them, the sleeve grouting method of the multi-sleeve synchronous grouting device includes the following steps: The first step: Connect the slurry inlet of the variable-diameter multi-way branch pipe mechanism to the slurry outlet of the grouting equipment, and firmly fix the joint with a fixed clip. The second step: Connect the grouting device to the water supply equipment, start the water switch of the control equipment, and clean the grouting device and the variable-diameter multi-way branch pipe mechanism until it is clean. The third step: Connect the straight pipe part at the bottom of the sleeve with a slurry stop valve to the slurry inlet of the grouting sleeve with a threaded end, and connect the top sleeve with a slurry stop valve to the slurry outlet of the grouting sleeve with a threaded end, so that the overflow port of the sleeve extends obliquely upward at an angle of 135°. The fourth step: Connect the slurry outlet of the variable-diameter multi-way branch pipe mechanism to the slurry inlet of the bottom sleeve with a slurry stop valve, clamp the connection part with a clip, and at the same time check whether all connection parts are firm. Then start the control equipment to wash the grouting sleeve with water to ensure that there is no blockage inside the grouting sleeve. The fifth step: Disconnect the connection end of the slurry outlet of the variable-diameter multi-way branch pipe mechanism from the bottom sleeve with a slurry stop valve. Pour the grouting material and tap water into the mixing device of the grouting equipment according to the ratio required by the construction plan, and start the mixing device to mix. After mixing is in place, start the grouting equipment and input the grouting material into the variable-diameter multi-way branch pipe mechanism. When the slurry outlets of each branch hose of the variable-diameter multi-way branch pipe mechanism discharge slurry evenly, connect each slurry outlet to the slurry inlet of the corresponding bottom sleeve of the grouting sleeve with a slurry stop valve, and clamp it with a clip. Among them, under the condition of the same grouting equipment, the grouting speed for single-channel grouting should be controlled at 40 r / min, the grouting speed for two-channel grouting should be controlled at 80 r / min, and the grouting speed for two-channel grouting should be controlled at 160 r / min. The sixth step: For multi-channel grouting, each grouting is carried out in sequence for the grouting sleeves in the same row, and each branch hose grouts at intervals of at least 2-3 grouting sleeves. When the grouting sleeves corresponding to each branch hose are filled, they are all shifted in sequence at intervals of 2-3 grouting sleeves in the same order and direction. The seventh step: After the top sleeve with a slurry stop valve discharges slurry evenly, close the slurry stop valve. After all the grouting sleeves are filled this time, control the speed of the grouting device to decrease, and at the same time close the slurry stop valve of the bottom sleeve with a slurry stop valve. Loosen the clip at the connection end of the slurry outlet of the branch hose of the variable-diameter multi-way branch pipe mechanism and the slurry inlet of the bottom sleeve with a slurry stop valve. At the same time, connect the variable-diameter multi-way branch pipe mechanism to the slurry connection end of the bottom sleeve with a slurry valve of the next group of several grouting sleeves in an orderly manner. The eighth step: Repeat the above steps 5 / 6 / 7 until all grouting sleeves are filled. Step 9: During the grouting process, observe the grout in the top sleeve with a grout stop valve of all the fully grouted grouting sleeves. If the grout shows a tendency to sink, supplementary grouting should be carried out in a timely manner; Step 10: Separate the reducing multi-way branch pipe mechanism from all the grouting sleeves. At this time, use the remote control device to turn on the water-using equipment of the grouting machine to clean the reducing multi-way branch pipe mechanism and the grouting device until they are clean; Step 11: The grouting is completed.

2. The multi-sleeve synchronous grouting device according to claim 1, characterized in that, The reducing multi-way branch pipe mechanism includes a first reducing tee and two branch hoses. The middle grout inlet pipe of the first reducing tee is connected to the grout outlet of the grouting machine. The two grout outlet pipes on both sides of the first reducing tee are respectively connected to the branch hoses. The cross-sectional area of the middle grout inlet pipe of the first reducing tee is 1.5 - 2.5 times that of the grout outlet pipes on both sides, and the pipe diameter of the grout outlet pipe is equal to that of the branch hose.

3. The multi-sleeve synchronous grouting device according to claim 1, characterized in that, The reducing multi-way branch pipe mechanism includes a second reducing tee, two first reducing tees and four branch hoses. The middle grout inlet pipe of the second reducing tee is connected to the grout outlet of the grouting machine. The two grout outlet pipes on both sides of the second reducing tee are respectively connected to the middle grout inlet pipe of one of the first reducing tees. The two grout outlet pipes on both sides of the first reducing tee are respectively connected to a branch hose. The cross-sectional area of the middle grout inlet pipe of the second reducing tee is 1.5 - 2.5 times that of the grout outlet pipes on both sides. The pipe diameter of the grout outlet pipes on both sides of the second reducing tee is equal to the pipe diameter of the middle grout inlet pipe of the first reducing tee. The cross-sectional area of the middle grout inlet pipe of the first reducing tee is 1.5 - 2.5 times that of the grout outlet pipes on both sides, and the pipe diameter of the grout outlet pipe is equal to that of the branch hose.

4. The multi-sleeve synchronous grouting device according to claim 2, wherein, The pipe diameter of the middle grout inlet pipe of the first reducing tee is 25 mm, the pipe diameter of the grout outlet pipes on both sides of the first reducing tee is 20 mm, and the pipe diameter of the branch hose is 20 mm.

5. The multi-sleeve synchronous grouting device according to claim 3, characterized in that The pipe diameter of the middle grout inlet pipe of the first reducing tee is 25 mm, the pipe diameter of the grout outlet pipes on both sides of the first reducing tee is 20 mm, and the pipe diameter of the branch hose is 20 mm; The pipe diameter of the middle grout inlet pipe of the second reducing tee is 40 mm, and the pipe diameter of the grout outlet pipes on both sides of the second reducing tee is 25 mm.

6. The multi-sleeve synchronous grouting device according to claim 1, characterized in that, A PVC outlet pipe is connected to the outlet of the branch hose. A preset grout inlet pipe with a larger inlet pipe diameter, a smaller outlet pipe diameter and a gradually decreasing pipe diameter in the middle is connected between the PVC outlet pipe and the grout inlet of the sleeve. A transparent connecting hose is connected to the inlet of the preset grout inlet pipe for connecting the PVC outlet pipe at the outlet of the branch hose. External threads are provided at the outlet of the preset grout inlet pipe, which are matched with the internal threads in the grout inlet of the sleeve. A switch valve is arranged between the inlet and the outlet of the preset grout inlet pipe.

7. The multi-sleeve synchronous grouting device according to claim 3, characterized in that, The second reducing tee and the first reducing tee, and between the first reducing tee and the branch hose are all connected by a turning pipe with a right angle and a 1 / 4 arc; The first variable-diameter three-way pipe, the second variable-diameter three-way pipe, and the turning pipe with a right angle and a 1 / 4 arc are all PVC pipes with a certain hardness.

8. The multi-sleeve synchronous grouting device according to claim 7, characterized in that, A flow splitting protrusion is provided at the connection of the middle slurry inlet pipe and the two side slurry outlet pipes of the first variable-diameter three-way pipe and the second variable-diameter three-way pipe, which is convenient for reducing the head loss during the flow of the mortar.

9. The multi-sleeve synchronous grouting device according to any one of claims 1 to 8, characterized in that, The rotation speed of the grouting machine is adjustable to control the grouting flow rate.

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