In-situ premixed soil-cement piles

Abstract

The present invention discloses an in-situ premixed cement soil pile, comprising: a highway foundation, a cement soil mixing pile is arranged inside, a top bracket is arranged at the top of the cement soil mixing pile, and the top bracket is installed at the upper end of the highway foundation, a mixer is arranged above the top bracket, a pile-lifting machine is arranged on one side of the mixer, and the traction end of the pile-lifting machine is located directly above the mixer, and a lifting frame is arranged below the mixer, movable tracks are arranged on both sides of the lifting frame, and the movable tracks are installed at the upper end of the top bracket. It achieves the effect of facilitating the installation of the pile driver and the mixer, and the top bracket used to install the pile driver and the mixer at the top of the cement soil pile after the construction is completed can also be used to install an external guardrail, which effectively avoids the problem of crushing at the top of the cement column.

Description

Technical Field

[0001] The invention relates to the technical field of highway engineering, and in particular to an in-situ premixed cement soil pile. Background Art

[0002] Cement soil mixing pile is a method used to reinforce saturated soft clay foundation. It uses cement as a curing agent. Through a special mixing machine, the soft soil and curing agent are forced to mix deep in the foundation. The soft soil is hardened into a high-quality foundation with integrity, water stability and certain strength by using a series of physical and chemical reactions between the curing agent and the soft soil. The reinforcement depth is usually more than five meters. The dry reinforcement depth should not exceed fifteen meters, and the wet reinforcement depth should not exceed twenty meters. The cement slurry pressed into the soft soil is forced to mix with the surrounding soft soil with the rotating mixing blades to form a mud reinforcement body. The basic principle of cement reinforcement soil is based on the physical and chemical reaction process of cement reinforcement soil. It is different from the hardening mechanism of concrete. Due to the small amount of cement, cement reacts in the presence of a certain active medium soil. The hardening speed is slow and the action is complex. After cement hydrolysis and hydration to generate various water compounds, some of them undergo ion exchange and granulation and hardening reactions, which greatly improves the strength of cement soil.

[0003] The existing cement soil pile lacks an effective top support maintenance mechanism during the construction process, which makes the installation of the pile driver and mixer inconvenient and causes the top of the cement column to be crushed. For this reason, we provide an in-situ premixed cement soil pile. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] Another object of the present invention is to provide an in-situ premixed cement soil pile, which facilitates the installation of a pile driver and a mixer and achieves the effect of quick installation. After the cement soil pile is built, the top bracket used to install the pile driver and the mixer can also be used to install an external guardrail, effectively avoiding the problem of crushing the top of the cement column.

[0006] To achieve the above purpose and some other purposes, the present invention adopts the following technical solutions:

[0007] An in-situ premixed cement soil pile, comprising:

[0008] The highway foundation has a cement-soil mixing pile arranged inside, and a top bracket is arranged at the top of the cement-soil mixing pile, and the top bracket is installed at the upper end of the highway foundation;

[0009] A mixer is arranged above the top bracket, a pile-lifting machine is arranged on one side of the mixer, and a traction end of the pile-lifting machine is located directly above the mixer;

[0010] A lifting frame is arranged below the mixer, and movable rails are arranged on both sides of the lifting frame, and the movable rails are installed on the upper end of the top bracket;

[0011] The outer guardrail is installed at the upper end of the top bracket, and the installation position of the outer guardrail is the same as the installation position of the movable track. The top of the outer guardrail is provided with four warning signs.

[0012] Preferably, four connecting sleeves are provided at the upper end of the top bracket, four reinforcing ribs are provided on the outer walls around the connecting sleeve, and the reinforcing ribs are integrally formed with the connecting sleeve, and the lower ends of the lifting frame and the outer guardrail are provided with connecting shafts, and the connecting shafts are integrally formed with the lifting frame and the outer guardrail, and the connecting shafts are installed in the channel inside the connecting sleeve.

[0013] Preferably, a mounting hole is provided inside the connecting shaft, and the mounting hole and the connecting shaft are integrally formed, nut slots are provided on the outer walls on both sides of the connecting sleeve, and the nut slots and the connecting sleeve are integrally formed, a through hole is provided inside the nut slot, and the through hole and the nut slot are integrally formed, and the mounting hole and the through hole are located on the same horizontal line.

[0014] Preferably, a fixing screw is installed inside the mounting hole and the through-hole, locking nuts are installed at both ends of the fixing screw, and the locking nut is fixedly installed with the fixing screw thread, the size of the locking nut is equal to the caliber of the nut slot, and the locking nut is located inside the nut slot.

[0015] Preferably, a grounding seat plate is provided at the lower end of the top bracket, and the grounding seat plate is integrally formed with the top bracket, reinforcing side plates are provided on the surrounding outer walls of the top bracket, and the two ends of the reinforcing side plates are respectively welded to the outer wall of the top bracket and the upper surface of the grounding seat plate, and the grounding seat plate is fixed to the highway foundation by grounding bolts.

[0016] Preferably, a center bearing is provided inside the lifting frame, a mixer main shaft is provided inside the center bearing, and the mixer main shaft is movably connected to the lifting frame through the center bearing, a mixing blade is provided at the bottom of the mixer, and the mixer is transmission-connected to the mixing blade through the mixer main shaft.

[0017] Preferably, a roller connecting groove is provided inside the movable track, a corresponding slideway is provided inside the roller connecting groove, and the corresponding slideway and the roller connecting groove are integrally formed with the movable track, synchronous sliders are provided on the outer walls on both sides of the lifting frame, and the synchronous sliders are integrally formed with the lifting frame, and a connecting roller is provided at one end of the synchronous slider.

[0018] Preferably, a side end groove is provided inside the synchronous slider, and the side end groove is integrally formed with the synchronous slider, positioning bearings are provided on the inner walls on both sides of the side end groove, and the connecting roller is located inside the side end groove, a corresponding connecting groove is provided on the outer wall of the connecting roller, and the corresponding connecting groove is integrally formed with the connecting roller, and the connecting roller is matched and connected with the corresponding slideway through the corresponding connecting groove.

[0019] Preferably, connecting shafts are provided on the outer walls on both sides of the connecting roller, and the connecting shafts and the connecting roller are integrally formed, the locating bearings are fixedly connected to the internal screws of the side end grooves, and the connecting rollers are movably connected to the locating bearings on the inner walls of the side end grooves through the connecting shafts on the outer walls on both sides.

[0020] Preferably, a traction rope is provided on the traction end of the pile pulling driver, a connecting lock is provided at the lower end of the traction rope, lock mounting plates are provided on the front end outer wall and the rear end outer wall of the lifting frame, and the lock mounting plate is integrally formed with the lifting frame, and the traction rope is fixedly connected to the lock mounting plate by the connecting lock.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. The present invention achieves the effect of facilitating and quickly installing the pile driver and the mixer by providing a top bracket. After the cement soil pile is built, the top bracket used for installing the pile driver and the mixer can also be used to install an outer guardrail, effectively avoiding the problem of the top of the cement column being crushed and stepped on. The existing cement soil pile lacks an effective top bracket maintenance mechanism during the construction process, which leads to the inconvenience of installing the pile driver and the mixer and the problem of the top of the cement column being crushed and stepped on.

[0023] 2. Use a theodolite or plumb bob to control the verticality of the lifting frame in both directions, then pre-mix the slurry. While the deep mixer is pre-mixing and sinking, mix the cement slurry in the background. Put the slurry into the hopper before grouting, start the turntable of the deep mixer, and after the speed of the mixing head is normal, let the drill rod sink and stir along the guide frame, so as to achieve the purpose of lifting the premixed material in situ to build cement soil piles.

[0024] 3. The side end grooves arranged inside the synchronous slider play a role in bearing the connecting rollers, the positioning bearings arranged on the inner walls on both sides of the side end grooves play a role in assisting the rolling of the connecting rollers, the corresponding connecting grooves arranged on the outer walls of the connecting rollers play a role in connecting with the corresponding slideways, the roller connecting grooves arranged inside the movable track play a role in facilitating the connection between the connecting rollers and the movable track, and the corresponding slideways arranged inside the roller connecting grooves play a role in facilitating the matching connection of the corresponding connecting grooves on the outer walls of the connecting rollers, thereby making the guiding and lifting activities of the mixer smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the in-situ premixed cement soil pile provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the outer guardrail structure of the in-situ premixed cement soil pile provided by the present invention;

[0027] Figure 3 It is a schematic diagram of the top support structure of the in-situ premixed cement soil pile provided by the present invention;

[0028] Figure 4 This is a schematic diagram of the connecting sleeve structure of the in-situ premixed cement soil pile provided by the present invention;

[0029] Figure 5 It is a schematic diagram of the lifting frame structure of the in-situ premixed cement soil pile provided by the present invention;

[0030] Figure 6 It is a schematic diagram of the movable track structure of the in-situ premixed cement soil pile provided by the present invention. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings so that ordinary technicians in the field can implement it according to the instructions.

[0032] like Figure 1-6 As shown, an in-situ premixed cement soil pile comprises:

[0033] A highway foundation 1 is provided with a cement-soil mixing pile 2 inside, and a top bracket 3 is provided at the top of the cement-soil mixing pile 2, and the top bracket 3 is installed at the upper end of the highway foundation 1;

[0034] A mixer 5 is arranged above the top bracket 3, a pile-lifting machine 9 is arranged on one side of the mixer 5, and a traction end of the pile-lifting machine 9 is located directly above the mixer 5;

[0035] A lifting frame 6 is arranged below the mixer 5, and movable rails 4 are arranged on both sides of the lifting frame 6, and the movable rails 4 are installed on the upper end of the top bracket 3;

[0036] The outer guardrail 12 is installed on the upper end of the top bracket 3, and the installation position of the outer guardrail 12 is the same as the installation position of the movable track 4. Four warning signs 13 are set on the top of the outer guardrail 12.

[0037] In the above scheme, after the cement mixing pile is placed, the pile mixer is moved to the designated pile position, centered and leveled, and the verticality of the lifting frame is controlled in both directions using a theodolite or plumb bob. The slurry is then pre-mixed, and the deep mixer is pre-mixed and sinking. At the same time, the cement slurry is mixed in the background. Before grouting, the slurry is put into the aggregate hopper, and the deep mixer turntable is started. After the speed of the mixing head is normal, the drill rod is allowed to sink and mix along the guide frame. The sinking speed can be adjusted by the gear position. After sinking to the designed depth, the mortar pump is turned on to deliver the slurry to the slurry outlet of the mixing head through the pipeline. After the slurry is discharged, the mixer is started and the chain tensioning device is tightened. According to the lifting speed determined by the design, the slurry is sprayed and mixed while the drill rod is lifted to fully mix the slurry and soil. After the mixing drill bit is lifted to a height of 500 mm above the pile top, the mortar pump is turned off, and the mixing is repeated and the pile is lowered to the designed depth. After sinking to the designed depth, the slurry is sprayed, mixed and lifted repeatedly until it is lifted to the ground. After constructing one pile, the pile driver is moved to the next pile position, and the above steps are repeated to construct the next cement mixing pile. After the cement soil pile is built, the top bracket of the pile lifting driver and mixer installed on the top can also be used to install the outer guardrail, which effectively avoids the problem of crushing on the top of the cement column.

[0038] In a preferred embodiment, four connecting sleeves 17 are provided at the upper end of the top bracket 3, four reinforcing ribs 18 are provided on the outer walls around the connecting sleeve 17, and the reinforcing ribs 18 are integrally formed with the connecting sleeve 17, and the lower ends of the lifting frame 6 and the outer guardrail 12 are provided with a connecting shaft 19, and the connecting shaft 19 is integrally formed with the lifting frame 6 and the outer guardrail 12, and the connecting shaft 19 is installed in the channel inside the connecting sleeve 17.

[0039] In the above scheme, the four connecting sleeves arranged at the upper end of the top bracket serve to facilitate the installation of the movable track and the outer guardrail on the top bracket, the four reinforcing ribs arranged on the outer walls around the connecting sleeve serve to strengthen the overall structural strength of the connecting sleeve, and the connecting plug shafts arranged at the lower ends of the lifting frame and the outer guardrail serve to facilitate the plug-in installation of the movable track and the outer guardrail with the connecting sleeve at the upper end of the top bracket.

[0040] In a preferred embodiment, a mounting hole 21 is provided inside the connecting shaft 19, and the mounting hole 21 is integrally formed with the connecting shaft 19, nut slots 20 are provided on the outer walls on both sides of the connecting sleeve 17, and the nut slot 20 is integrally formed with the connecting sleeve 17, a through hole 22 is provided inside the nut slot 20, and the through hole 22 is integrally formed with the nut slot 20, and the mounting hole 21 and the through hole 22 are located on the same horizontal line.

[0041] In the above scheme, the mounting hole arranged inside the connecting shaft serves to facilitate the fixed installation of the connecting shaft and the connecting sleeve, the nut slots arranged on the outer walls on both sides of the connecting sleeve serve to accommodate the load-bearing locking nuts, and the through-holes arranged inside the nut slots serve to correspond to the mounting holes and facilitate the installation of the fixed screw.

[0042] In a preferred embodiment, a fixing screw 23 is installed inside the mounting hole 21 and the through hole 22, locking nuts 24 are installed at both ends of the fixing screw 23, and the locking nut 24 is threadedly fixed to the fixing screw 23, the size of the locking nut 24 is equal to the caliber of the nut slot 20, and the locking nut 24 is located inside the nut slot 20.

[0043] In the above scheme, the fixing screws installed inside the mounting hole and the through-hole serve to fix the connecting shaft and the connecting sleeve, and the locking nuts installed at both ends of the fixing screw serve to lock the two ends of the fixing screw. The size of the locking nut is equal to the caliber of the nut slot, which can make the sealing of the locking nut installation more excellent.

[0044] In a preferred embodiment, a grounding seat plate 14 is provided at the lower end of the top bracket 3, and the grounding seat plate 14 is integrally formed with the top bracket 3. Reinforced side plates 15 are provided on the outer walls around the top bracket 3, and the two ends of the reinforced side plates 15 are respectively welded to the outer wall of the top bracket 3 and the upper surface of the grounding seat plate 14. The grounding seat plate 14 is fixed to the highway foundation 1 by grounding bolts 16.

[0045] In the above scheme, the grounding base plate arranged at the lower end of the top bracket serves to facilitate the fixed installation of the top bracket and the highway foundation, and the reinforced side plates arranged on the outer walls around the top bracket serve to reinforce the overall structural strength of the top bracket. The grounding base plate is fixed to the highway foundation through grounding bolts, which can make the installation of the top bracket more stable.

[0046] In a preferred embodiment, a center bearing 31 is provided inside the lifting frame 6, a mixer main shaft 32 is provided inside the center bearing 31, and the mixer main shaft 32 is movably connected to the lifting frame 6 through the center bearing 31, a mixing blade 7 is provided at the bottom of the mixer 5, and the mixer 5 is transmission-connected to the mixing blade 7 through the mixer main shaft 32.

[0047] In the above scheme, the central bearing arranged inside the lifting frame plays a role in assisting the rotation of the mixer main shaft, and the mixer main shaft arranged inside the central bearing plays a role in driving the rotation of the mixing blades at the bottom of the mixer, and the mixing blades arranged at the bottom of the mixer play a role in mixing cement and foundation medium soil.

[0048] In a preferred embodiment, a roller connecting groove 33 is provided inside the movable track 4, a corresponding slideway 34 is provided inside the roller connecting groove 33, and the corresponding slideway 34 and the roller connecting groove 33 are integrally formed with the movable track 4, and a synchronous slider 8 is provided on the outer walls of both sides of the lifting frame 6, and the synchronous slider 8 is integrally formed with the lifting frame 6, and a connecting roller 26 is provided at one end of the synchronous slider 8.

[0049] In the above scheme, the roller connecting groove arranged inside the movable track serves to facilitate the connection between the roller and the movable track, the corresponding slideway arranged inside the roller connecting groove serves to facilitate the matching connection with the corresponding connecting groove on the outer wall of the roller, and the synchronous sliders arranged on the outer walls on both sides of the lifting frame serve to assist the lifting frame in performing lifting and lowering activities.

[0050] In a preferred embodiment, a side end groove 25 is provided inside the synchronous slider 8, and the side end groove 25 is integrally formed with the synchronous slider 8, positioning bearings 28 are provided on the inner walls on both sides of the side end groove 25, and the connecting roller 26 is located inside the side end groove 25, and a corresponding connecting groove 27 is provided on the outer wall of the connecting roller 26, and the corresponding connecting groove 27 is integrally formed with the connecting roller 26, and the connecting roller 26 is matched and connected with the corresponding slideway 34 through the corresponding connecting groove 27.

[0051] In the above scheme, the side end grooves arranged inside the synchronous slider play the role of supporting the connecting rollers, the positioning bearings arranged on the inner walls on both sides of the side end grooves play the role of assisting the rolling of the connecting rollers, and the corresponding connecting grooves arranged on the outer walls of the connecting rollers play the role of connecting with the corresponding slideways.

[0052] In a preferred embodiment, connecting shafts 29 are provided on the outer walls on both sides of the connecting roller 26, and the connecting shafts 29 and the connecting roller 26 are integrally formed, the locating bearings 28 are fixedly connected to the internal screws of the side end groove 25, and the connecting roller 26 is movably connected to the locating bearings 28 on the inner walls of the side end groove 25 through the connecting shafts 29 on the outer walls on both sides.

[0053] In the above scheme, the connecting shafts arranged on the outer walls on both sides of the connecting roller serve to facilitate the connection of the connecting roller to the locating bearing, and the locating bearing is fixedly connected to the internal screws of the side end groove to make the locating bearing more secure.

[0054] In a preferred embodiment, a traction rope 10 is provided on the traction end of the pile pulling driver 9, and a connecting lock 11 is provided at the lower end of the traction rope 10. Lock mounting plates 30 are provided on the front end outer wall and the rear end outer wall of the lifting frame 6, and the lock mounting plate 30 is integrally formed with the lifting frame 6. The traction rope 10 is fixedly connected to the lock mounting plate 30 by the connecting lock 11.

[0055] In the above scheme, the traction rope arranged on the traction end of the pile pulling driver plays the role of driving the mixer to rise and fall, and the connecting lock arranged at the lower end of the traction rope plays the role of fixing the lock mounting plates on the front end outer wall and the rear end outer wall of the lifting frame.

[0056] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An in-situ premixed cement soil pile, characterized in that: include: The highway foundation has a cement-soil mixing pile arranged inside, and a top bracket is arranged at the top of the cement-soil mixing pile, and the top bracket is installed at the upper end of the highway foundation; A mixer is arranged above the top bracket, a pile-lifting machine is arranged on one side of the mixer, and a traction end of the pile-lifting machine is located directly above the mixer; A lifting frame is arranged below the mixer, and movable rails are arranged on both sides of the lifting frame, and the movable rails are installed on the upper end of the top bracket; An outer guardrail, which is installed at the upper end of the top bracket, and the installation position of the outer guardrail is the same as the installation position of the movable track, and four warning signs are arranged at the top of the outer guardrail; four connecting sleeves are arranged at the upper end of the top bracket, and four reinforcing ribs are arranged on the outer walls around the connecting sleeve, and the reinforcing ribs and the connecting sleeve are integrally formed, and the lower ends of the lifting frame and the outer guardrail are both provided with connecting plug shafts, and the connecting plug shafts are integrally formed with the lifting frame and the outer guardrail, and the connecting plug shafts are installed in the channel inside the connecting sleeve; The connecting plug shaft is provided with a mounting hole inside, and the mounting hole and the connecting plug shaft are formed integrally, the outer walls of both sides of the connecting sleeve are provided with nut clamping grooves, and the nut clamping groove and the connecting sleeve are formed integrally, the nut clamping groove is provided with a through hole inside, and the through hole and the nut clamping groove are formed integrally, and the mounting hole and the through hole are located on the same horizontal line; A fixing screw is installed inside the mounting hole and the through-hole, and locking nuts are installed at both ends of the fixing screw, and the locking nut is fixedly installed with the fixing screw thread, the size of the locking nut is equal to the caliber of the nut slot, and the locking nut is located inside the nut slot; A roller connecting groove is provided inside the movable track, a corresponding slideway is provided inside the roller connecting groove, and the corresponding slideway and the roller connecting groove are integrally formed with the movable track. Synchronous sliders are provided on the outer walls of both sides of the lifting frame, and the synchronous sliders are integrally formed with the lifting frame, and a connecting roller is provided at one end of the synchronous slider.

2. The in-situ premixed cement soil pile according to claim 1, characterized in that: A grounding seat plate is provided at the lower end of the top bracket, and the grounding seat plate is integrally formed with the top bracket. Reinforced side plates are provided on the outer walls around the top bracket, and the two ends of the reinforced side plates are respectively welded to the outer wall of the top bracket and the upper surface of the grounding seat plate. The grounding seat plate is fixed to the highway foundation by grounding bolts.

3. The in-situ premixed cement soil pile according to claim 1, characterized in that: A central bearing is arranged inside the lifting frame, a main shaft of a mixer is arranged inside the central bearing, and the main shaft of the mixer is movably connected to the lifting frame through the central bearing, a mixing blade is arranged at the bottom of the mixer, and the mixer is transmission-connected to the mixing blade through the main shaft of the mixer.

4. The in-situ premixed cement soil pile according to claim 1, characterized in that: A side end groove is provided inside the synchronous slider, and the side end groove is integrally formed with the synchronous slider, positioning bearings are provided on the inner walls on both sides of the side end groove, and the connecting roller is located inside the side end groove, a corresponding connecting groove is provided on the outer wall of the connecting roller, and the corresponding connecting groove is integrally formed with the connecting roller, and the connecting roller is matched and connected with the corresponding slideway through the corresponding connecting groove.

5. The in-situ premixed cement soil pile according to claim 4, characterized in that: Connecting shafts are provided on the outer walls on both sides of the connecting roller, and the connecting shafts and the connecting roller are integrally formed, the locating bearings are fixedly connected to the internal screws of the side end grooves, and the connecting rollers are movably connected to the locating bearings on the inner walls of the side end grooves through the connecting shafts on the outer walls on both sides.

6. The in-situ premixed cement soil pile according to claim 1, characterized in that: A traction rope is provided on the traction end of the pile pulling machine, and a connecting lock is provided at the lower end of the traction rope. Lock mounting plates are provided on the front end outer wall and the rear end outer wall of the lifting frame, and the lock mounting plate is integrally formed with the lifting frame. The traction rope is fixedly connected to the lock mounting plate through the connecting lock.

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