Device for post-grouting of cast-in-place pile

Abstract

The utility model relates to the technical field of foundations, and provides a device for post-grouting of a cast-in-place pile, which comprises at least two in-pile grouting pipes and pile side grouting pipes fixed on a reinforcement cage, the bottom ends of the at least two in-pile grouting pipes and the pile side grouting pipes penetrate through a first fixing plate, and the end parts of the in-pile grouting pipes are fixedly connected with grouting pipe sprayers; the utility model discloses a device for post-grouting of a cast-in-place pile, which comprises a plurality of grouting pipe sprayers, the grouting pipe sprayers are arranged on the periphery of the grouting pipe sprayers, pipe orifices of every two adjacent grouting pipe sprayers are connected through a hose, and the hoses are fixed on the pipe orifices of the grouting pipe sprayers through non-detachable fixing rings. During grouting, the bearing area is enlarged, and sediment at the bottom of the pile can be solidified; by arranging the fixing ring, the situation that in the hoisting and placing process of the reinforcement cage, due to shaking and other reasons, the grouting pipe and the grouting pipe spray head are loosened at the connecting position is prevented, and blockage of a grouting hole of the grouting pipe spray head is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation, in particular to a device for post-grouting of cast-in-place piles. Background Art

[0002] Post-grouting of bored piles refers to the process of injecting cement slurry through the grouting conduit preset in the pile body and the grouting valves at the pile end and pile side connected to it a certain period of time after the bored pile is formed, so that the soil at the pile end and pile side (including sediment and mud skin) is reinforced, thereby improving the bearing capacity of the single pile and reducing settlement.

[0003] At present, in the field of foundation, finished grouting capsules are generally used for bored piles. However, the grouting capsules are expensive and the on-site operation is complicated. The fixing method between the grouting pipe and the grouting pipe nozzle of the flexible grouting chamber on the market is not strong enough. During the hoisting and placement of the steel cage, it may cause distortion, causing the grouting pipe and the grouting pipe nozzle to loosen at the connection, thereby causing the grouting hole to be blocked. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a device for post-grouting of cast-in-place piles, which solves the problems raised in the above-mentioned background technology.

[0005] The technical solution of this utility model is as follows:

[0006] A device for post-grouting of cast-in-place piles, comprising at least two pile-in-grouting pipes and a pile-side grouting pipe fixed on a steel cage, the bottom ends of which pass through a first fixed plate, the ends of the pile-in-grouting pipes are fixedly connected to a grouting pipe nozzle, the pipe openings of two adjacent grouting pipe nozzles are connected by a hose, and the hose is fixed to the pipe opening of the grouting pipe nozzle by a non-detachable fixing ring.

[0007] Furthermore, the grouting pipe nozzle is connected to the grouting pipe in the pile, and annular grooves are arranged at both ends of the grouting pipe nozzle, and a fixing ring is fixedly connected to the annular groove.

[0008] Furthermore, the fixing ring includes a first half ring and a second half ring hinged to the first half ring, a slot is provided at the end of the first half ring, and a connecting block connected to the end of the second half ring cooperates with the slot.

[0009] Furthermore, two side walls of the slot are provided with recessed grooves, and a fixing ring engaged in the recessed grooves is provided in the connecting block.

[0010] Furthermore, the fixing ring includes a clamping block and a spring, and symmetrical grooves are provided on both sides of the connecting block. The bottom wall of the groove is fixed to one end of the spring, and the other end is fixed to the bottom end of the clamping block.

[0011] Furthermore, the protrusions arranged on the inner surfaces of the first half ring and the second half ring can be inserted into the annular groove.

[0012] Furthermore, the projection is made of rubber material, and the inner diameter of the projection is larger than the outer diameter of the annular groove.

[0013] Furthermore, the hose is fixedly connected to a second fixing plate.

[0014] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0015] The utility model provides a device for post-grouting of bored piles, which forms a closed circular ring by connecting a hose to the pipe mouth of a grouting pipe nozzle, thereby expanding its bearing area during grouting and solidifying the sediment at the bottom of the pile; by arranging a fixing ring, the grouting pipe and the grouting pipe nozzle are prevented from loosening at the connection due to shaking during the hoisting and placement of the steel cage, thereby effectively avoiding blockage of the slurry outlet hole of the grouting pipe nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0017] Figure 1 A schematic diagram of the construction of a cast-in-place pile provided by the utility model;

[0018] Figure 2 A schematic diagram of the structure of the pile bottom grouting device provided by the utility model;

[0019] Figure 3 It is a structural schematic diagram of the grouting pipe nozzle;

[0020] Figure 4 is a schematic diagram of the structure of the fixed ring;

[0021] Figure 5 is a schematic structural diagram of the end portion of the first half ring;

[0022] Figure 6 is a schematic cross-sectional view of the end portion of the second half ring;

[0023] Figure 7 is a schematic structural diagram of a second fixed plate;

[0024] In the figure: 1, accommodating hole; 2, steel cage; 3, grouting pipe in pile; 4, grouting pipe on pile side; 5, hose; 6, first fixing plate; 61, second fixing plate; 611, fixing block; 7, annular groove; 8, grouting pipe nozzle; 9, fixing ring; 901, first half ring; 902, second half ring; 903, protrusion; 904, connecting block; 905, slot; 906, sink; 907, block; 908, groove; 909, spring. DETAILED DESCRIPTION

[0025] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model embodiments shall fall within the scope of protection of the present utility model embodiments.

[0026] Example

[0027] Please refer to Figures 1 to 7 A device for post-grouting of cast-in-place piles, comprising at least two pile-in-grouting pipes 3 and pile-side grouting pipes 4 fixed on a steel cage 2, the bottom ends of the pile-in-grouting pipes 3 and the pile-side grouting pipes 4 pass through a first fixed plate 6, the ends of the pile-in-grouting pipes 3 are fixedly connected to a grouting pipe nozzle 8, the pipe openings of two adjacent grouting pipe nozzles 8 are connected by a hose 5, and the hose 5 is fixed to the pipe opening of the grouting pipe nozzle 8 by a non-detachable fixing ring 9.

[0028] Specifically, the first fixing plate 6 is an annular plate structure, and a through hole is provided in the middle for the mud and sediment in the receiving hole 1 to pass through the first fixing plate 6. Through the through hole provided at the central position of the first fixing plate 6, in the process of the pile bottom grouting cavity sinking toward the bottom of the receiving hole 1, the mud water and air in the receiving hole 1 will pass through the through hole to reach the top of the pile bottom grouting cavity, and will not form an eddy current that damages the hole wall between the pile bottom grouting cavity and the receiving hole 1, thereby preventing the mud water flow swirling between the edge of the first fixing plate 6 and the receiving hole 1 from scouring and disturbing the hole wall of the receiving hole 1, effectively preventing the hole wall collapse of the receiving hole 1, the excessive sediment at the bottom of the hole, and the broken pile, thereby effectively improving the construction quality of the cast-in-place pile body;

[0029] The hose 5 is made of rubber, and a spiral steel wire is fixedly connected to its inner wall. There are two hoses 5. The grouting pipe nozzle 8 is an arc-shaped structure. There are two grouting pipes 3 in the pile. The grouting pipes 3 in the pile are fixedly tied and connected to the steel cage 2. The grouting pipes 3 in the pile are welded on the grouting pipe nozzle 8. The two ends of the hose 5 are sleeved on the ends of the upper grouting pipe nozzle 8 to form a hollow annular structure with a matching shape, so that the slurry is filled inside to reach an expanded state; when in use, the grouting pipes in the two piles are simultaneously filled with slurry. 3. Pressure grouting is performed, the hose 5 expands, and the adjacent spiral steel wires are partially limited and broken after being compressed, so that the pile body and the pile bottom are closely combined, and the pile bottom and the strata around the pile bottom are more compact and stronger, and finally the ultimate bearing capacity of the pile is greatly improved; the hose 5 solves the problems of high construction cost and complicated operation of the grouting capsule in the prior art, and at the same time ensures the grouting quality of the post-grouting, and solves the problems of the formation of the volume of the hose 5 at the pile end and the compaction effect on the surrounding strata and the small increase in the bearing capacity of the pile end;

[0030] The steel cage 2 is welded to the first fixing plate 6. Two pile side grouting pipes 4 are also arranged on the steel cage 2 and pass through the first fixing plate 6. The first grouting hole of the pile side grouting pipe 4 is arranged near the hose 5, and the bottom end of the pile side grouting pipe 4 exceeds the hose 5. By performing pressure grouting to the bottom of the cast-in-place pile, the stratum around the pile body is made more compact and stronger, and the cast-in-place pile is more closely combined with the surrounding stratum, and finally the ultimate bearing capacity of the pile is greatly improved;

[0031] In this embodiment, before construction, the hose 5 and the grouting pipe nozzle 8 are assembled first, and then air or water is filled into the opening on the upper surface of the grouting pipe nozzle 8 to detect whether the hose 5 has leakage and the expansion size.

[0032] like Figure 2 and Figure 3 As shown, the grouting pipe nozzle 8 is connected to the grouting pipe 3 in the pile, and annular grooves 7 are provided at both ends of the grouting pipe nozzle 8. A fixing ring 9 is fixedly connected to the annular groove 7. The bottom end of the grouting pipe 3 in the pile is welded at the opening. When the hose 5 is connected, the end of the hose 5 must exceed the position of the annular groove 7. The hose 5 is fixed by using the fixing ring 9 at the position of the annular groove 7.

[0033] like Figure 4As shown, the fixing ring 9 includes a first half ring 901 and a second half ring 902 hinged to the first half ring 901, a slot 905 is provided at the end of the first half ring 901, a connecting block 904 connected to the end of the second half ring 902 cooperates with the slot 905, a slot 905 is provided at one end of the second half ring 902 for plugging into one end of the first half ring 901, and the second half ring 902 and the first half ring 901 are connected at the connection by a hinge shaft, a slot 905 is provided at the middle position of the other end of the first half ring 901, and the size of the slot 905 is consistent with the size of the connecting block 904.

[0034] like Figure 5 As shown, sink grooves 906 are provided on both side walls of the slot 905 , and a fixing ring 9 engaged in the sink groove 906 is provided in the connecting block 904 .

[0035] like Figure 6 As shown, the fixing ring 9 includes a clamping block 907 and a spring 909 , and symmetrical grooves 908 are provided on both sides of the connecting block 904 . The bottom wall of the groove 908 is fixedly connected to one end of the spring 909 , and the other end is fixedly connected to the bottom end of the clamping block 907 .

[0036] Specifically, the same sink grooves 906 are arranged on the two side walls of the slot 905, and the sink groove 906 is a rectangular inner cavity. The block 907 is a rectangular block that matches the inner cavity of the rectangular block. By setting the rectangular block to be engaged in the inner cavity of the rectangular block, the fixing method between the hose 5 and the grouting pipe nozzle 8 can be made more secure and not easy to be disassembled. The connection is not easy to loosen during the descent process. A groove 908 is arranged on the opposite side of the connecting block 904 and the sink groove 906. The two grooves 908 are not connected. One end of the spring 909 is fixed in the groove 90 8, when the spring 909 is in a natural state, the connecting block 907 contacts the bottom wall of the sink 906. When the block 907 needs to be inserted into the sink 906, the block 907 can completely enter the groove 908; when the fixing ring 9 is closed, two fingers press the block 907, the spring 909 is compressed, so that the upper surface of the block 907 and the connecting block 904 are in the same horizontal plane, first a part of the block 907 is inserted into the slot 905, and then the first half ring 901 and the second half ring 902 are squeezed with both hands to make the block 907 inserted into the sink 906.

[0037] like Figure 4 As shown, the protrusions 903 provided on the inner surfaces of the first half ring 901 and the second half ring 902 can be inserted into the annular groove 7 .

[0038] like Figure 4 As shown, the protrusion 903 is made of rubber material, and the inner diameter of the protrusion 903 is larger than the outer diameter of the annular groove 7 .

[0039] Specifically, the two protrusions 903 are of the same arc-shaped structure, the curvature of the protrusion 903 is smaller than the curvature of the first half ring 901 and the second half ring 902, the thickness of the protrusion 903 is greater than the depth of the annular groove 7, and the protrusion 903 is bonded or clamped to the inner surfaces of the first half ring 901 and the second half ring 902; in order to further fix the hose 5, the protrusion 903 is provided to be clamped in the annular groove 7, and by providing the protrusion 903 of rubber material, when the fixing ring 9 is closed, the protrusion 903 is squeezed by the fixing ring 9, so that the protrusion 903 can be pressed more closely in the annular groove 7, making the overall structure more stable.

[0040] like Figure 7 As shown, the hose 5 is fixedly connected to a second fixing plate 61, the second fixing plate 61 is elliptical, a fixing block 611 is welded on a straight surface of the second fixing plate 61, and the fixing block 611 is bonded to the middle position of the bottom end of the hose 5; when slurry is filled into the hose 5, the second fixing plate 61 squeezes the concrete downward as the volume of the hose 5 increases, so that the pile bottom and the surrounding strata are denser and stronger.

[0041] The working process of a device for post-grouting of cast-in-place piles provided by the utility model is as follows:

[0042] The sediment in the receiving hole 1 is cleaned; the steel cage 2 with the pile bottom grouting chamber installed at the lower end is sunk to the bottom of the receiving hole 1; concrete is poured into the receiving hole 1 to form a cast-in-place pile; grouting is injected into the hose 5 through the pile side grouting pipe, the volume of the hose 5 becomes larger, and the second fixed plate 61 squeezes the concrete downward; grouting is injected into the pile bottom through the grouting pipe in the pile.

[0043] It should be noted that the equipment structure and drawings of the utility model mainly describe the principle of the utility model. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above utility model, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field;

[0044] The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0045] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations or direct or indirect applications may be made to these embodiments without departing from the principles and spirit of the present invention. In other related technical fields, the scope of the present invention is defined by the attached claims and their equivalents, which are equally included in the scope of patent protection of the present invention.

Claims

1. A device for post-grouting of a cast-in-place pile, comprising at least two pile-inside grouting pipes and a pile-side grouting pipe fixed to a steel cage, characterized in that: The bottom ends of the grouting pipe inside the pile and the grouting pipe on the side of the pile pass through the first fixed plate, the end of the grouting pipe inside the pile is fixedly connected to the grouting pipe nozzle, the pipe openings of two adjacent grouting pipe nozzles are connected by a hose, and the hose is fixed to the pipe opening of the grouting pipe nozzle by a non-detachable fixing ring.

2. The device for post-grouting of cast-in-place piles according to claim 1, characterized in that: The grouting pipe nozzle is communicated with the grouting pipe in the pile, and annular grooves are arranged at both ends of the grouting pipe nozzle, and a fixing ring is fixedly connected to the annular groove.

3. The device for post-grouting of cast-in-place piles according to claim 2, characterized in that: The fixing ring comprises a first half ring and a second half ring hinged to the first half ring. A clamping groove is arranged at the end of the first half ring, and a connecting block connected to the end of the second half ring cooperates with the clamping groove.

4. The device for post-grouting of cast-in-place piles according to claim 3, characterized in that: The two side walls of the clamping slot are provided with sinking grooves, and the connecting block is provided with a fixing ring which is engaged in the sinking grooves.

5. The device for post-grouting of cast-in-place piles according to claim 4, characterized in that: The fixing ring comprises a clamping block and a spring. Symmetrical grooves are arranged on two side surfaces of the connecting block. One end of the spring is fixed to the upper end of the bottom wall of the groove, and the other end is fixed to the bottom end of the connecting clamping block.

6. The device for post-grouting of cast-in-place piles according to claim 3, characterized in that: The protrusions arranged on the inner surfaces of the first half ring and the second half ring can be inserted into the annular groove.

7. The device for post-grouting of cast-in-place piles according to claim 6, characterized in that: The convex block is made of rubber material, and the inner diameter of the convex block is greater than the outer diameter of the annular groove.

8. The device for post-grouting of cast-in-place piles according to claim 1, characterized in that: The hose is fixedly connected to a second fixing plate.

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