Anchor rod positioning retainer for manufacturing cast-in-place anti-floating pile

Abstract

The invention relates to the technical field of building pile foundation equipment, in particular to an anchor rod positioning retainer of a pouring forming anti-floating pile. Comprising an inner positioning frame, an outer positioning frame and a positioning frame connector, the inner positioning frame is formed by bending a steel pipe, the outer positioning frame is formed by bending a steel bar, the positioning connector is a rubber pipe sleeve, and the outer end of the inner positioning frame and the connecting end of the outer positioning frame are sleeved with the rubber pipe sleeve so that the inner positioning frame and the outer positioning frame can be connected and fixed; according to the technical characteristics of secondary high-pressure grouting during construction of the anti-floating pile, the positioning retainer is designed to be of a hydraulic action structure, and a layer of high-thickness concrete slurry film is additionally arranged on the retainer, so that the situation that underground water permeates along the positioning retainer to corrode the steel bar anchor rod is effectively prevented; and in addition, the anti-floating performance of the anti-floating pile is improved in a further expansion scheme.

Description

Technical field:

[0001] The invention relates to the technical field of building pile foundation equipment, and in particular to an anchor rod positioning retainer for a cast-in-place anti-floating pile. Background technology:

[0002] Anti-floating piles are pull-out piles that withstand tension through their own weight and the friction between their surface and the soil. They are used to keep the underground structure of the building stable in the buoyancy caused by the groundwater level. The cast-in-place anti-floating pile structure consists of steel anchor rods, high-pressure injection pipes, positioning retainers and concrete pile bodies. During the construction process, it is necessary to open a hole in the soil, hang the bundled steel anchor rods, high-pressure injection pipes and positioning retainers in the hole, and then pour concrete. After the first normal pressure injection is completed, the high-pressure injection pipe is used for secondary high-pressure grouting after the concrete strength reaches the process index to complete the entire injection work.

[0003] Since the steel anchor rod is the main structural member that bears the tension in the anti-floating pile, the steel anchor rod needs to be kept intact and positioned at the center axis of the anti-floating pile during the design life of the anti-floating pile. The positioning retainer is used to prevent the steel anchor rod from shifting during the hoisting process. Under the pouring molding process, the soil around the anti-floating pile is in direct contact with the positioning retainer. Groundwater easily penetrates into the concrete along the positioning retainer and corrodes until it contacts the steel anchor rod, causing the anchor rod to corrode and fail, causing the anti-floating pile to fail. The purpose of secondary high-pressure grouting is to form a slurry film between the tied positioning retainer and the steel anchor rod, which plays a water-blocking role after solidification, preventing groundwater that penetrates along the positioning retainer from contacting the steel anchor rod.

[0004] At present, the positioning retainer used for steel anchor bolt positioning is formed by bending steel bars, and is processed and tied together with steel anchor bolts at the construction site. Although it is low-cost and easy to process, it has the problems of small grouting thickness and poor mechanical vibration resistance after secondary high-pressure grouting. In the further construction process after the completion of pile foundation construction, the water-blocking layer formed by the solidification of the grouting film is prone to cracks due to the direct connection between the steel anchor bolts and the upper building structure, resulting in the loss of sealing and water-blocking effect, affecting the service life of the anti-floating pile. In the current technical solution, safety redundancy is only given to this problem during architectural design. Summary of the invention:

[0005] In view of this, it is necessary to design a new type of cast-in-place anti-floating pile anchor positioning retainer to increase the thickness of the slurry film that can be formed by secondary high-pressure pouring and reduce the possibility of failure of the water-blocking layer causing the steel anchor to rust and fail due to contact with groundwater.

[0006] The invention discloses an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles, comprising an inner positioning frame, an outer positioning frame and a positioning frame connector.

[0007] The inner positioning frame is formed by bending a steel pipe, the outer positioning frame is formed by bending a steel bar, and the positioning connector is a rubber tube sleeve, which is sleeved on the outer end of the inner positioning frame and the connecting end of the outer positioning frame to connect and fix the inner positioning frame and the outer positioning frame.

[0008] The inner end of the inner positioning frame is used to be tied to the steel anchor rod to achieve the connection and fixation of the positioning retaining frame and the steel anchor rod. The pipe hole at the inner end of the inner positioning frame is sealed and grooved in the direction of the secondary grouting pipe. When the secondary grouting pipe is grouting, the slurry is connected to the inner positioning frame along the groove and injected into the rubber casing through the inner positioning frame.

[0009] In this scheme, the length, bending angle and size of the inner positioning frame, outer positioning frame and rubber tube sleeve are determined according to the number, diameter, spacing, anti-floating piles and hole diameter of the steel anchor rods. The corresponding materials are cut and bent into shape, and spliced ​​and used at the construction site. During installation, 3-4 positioning retainers are used as a group and tied evenly around the steel anchor rods. In this scheme, since the inner positioning frame and the outer positioning frame are connected by rubber tube sleeves, the connection only has compressive resistance but not tensile and torsion resistance. Therefore, they cannot be tied with the steel anchor rods and then supported and stacked by the positioning retainers waiting for hanging. The steel anchor rods need to be placed with support frames. At the same time, in order to prevent the outer positioning frame under the steel support from being separated from the inner positioning frame due to its own weight, each group of positioning retainers should be temporarily fixed to the outer positioning frame by wire tying or other methods. This temporary fixation needs to be removed when hanging the steel anchor rods.

[0010] The protection scope of this scheme is the positioning and retaining frame structure after the lifting is completed. The above description of the construction plan for this scheme is only a construction suggestion after the structure is changed relative to the existing positioning frame, and is not intended to limit the protection scope of this scheme.

[0011] After the positioning and retaining frame is hoisted, two groutings are still carried out according to the current construction method. The first is normal pressure grouting. The grouting pipe is extended into the bottom of the pile hole. The pipe mouth is lifted while grouting, and the pipe mouth is always kept below the grouting liquid surface. Three to four hours after the normal pressure grouting is completed, high pressure grouting is carried out through the high pressure grouting pipe until the slurry overflows at the top of the anti-floating pile. During high pressure grouting, the slurry output by the high pressure grouting pipe enters the inner positioning frame pipe along the slot of the inner positioning frame and is input into the rubber sleeve. The slurry pressure pushes the outer positioning frame and the rubber sleeve, so that the outer positioning frame moves away from the inner positioning frame and expands the rubber sleeve to form a grouting layer with a thickness of 3 to 5 mm. Since the normal pressure grouting slurry is not completely solidified at this time, the structural strength is low. Cracks will be generated under the above action caused by high pressure grouting. After the cracks are discharged from the high pressure grouting pipe and the air squeezed out by the high pressure grouting inside the inner positioning frame, they are filled with high pressure grouting slurry, so that there are no air holes in the anti-floating pile. During the period from when the pump is stopped after high-pressure grouting to when the grouting is completely solidified, the rubber casing rebounds and shrinks, so that the grouting layer inside the rubber casing and between the inner positioning frame and the outer positioning frame maintains its thickness and does not shrink. After the grouting solidifies, a water-blocking layer is formed between the inner positioning frame and the outer positioning frame, thereby preventing groundwater from rusting along the positioning frame and invading the interior of the anti-floating pile, causing damage to the steel anchor rod.

[0012] This solution can expand the functions on the basis of the above basic functions. Preferably, there is one inner positioning frame, and when the positioning and retaining frame is hoisted into the hole with the steel anchor, the inner positioning frame is located below the outer positioning frame. Under this structure, the outer positioning frame will greatly push outward and wedge into the side wall of the pile hole during high-pressure grouting, destroying the smooth interface between the anti-floating pile and the soil, thereby increasing the friction between the anti-floating pile and the soil layer and improving the anti-floating performance of the anti-floating pile. When using this solution, since the outer positioning frame is only supported on one side, the effect of straightening the steel anchor is poor, so it needs to be mixed with other positioning frames with better straightening effects, and it is only suitable for setting at the lower part of the steel anchor with a lower degree of eccentricity when hoisted.

[0013] Preferably, there are two inner positioning frames, which are respectively located above and below the outer positioning frame when the positioning and retaining frames are hoisted into the hole with the steel bar anchor. This solution is closest to the existing positioning and retaining frame structure in this case, and the effect of straightening the anchor is better than the above-mentioned single inner positioning frame solution.

[0014] Furthermore, the outer part of the external positioning frame is wrapped with a rubber layer, and the rubber layer forms a rubber pad in the rubber tube sleeve, which is used to buffer the inevitable vibration of subsequent construction and prevent the water-blocking layer formed by the solidification of the grouting layer from being impacted by the external positioning frame in contact with the outer soil layer of the anti-floating pile under vibration and causing cracks.

[0015] Furthermore, the rubber layer and the rubber sleeve are bonded and fixed or manufactured as a whole. Under this structure, the rubber sleeve is fixedly connected to the outer positioning frame, and the production of prefabricated parts is more easily standardized to prevent the connection from failing and falling off. In addition, during high-pressure grouting, the rubber sleeve will be pushed outward with the outer positioning frame and will be out of contact with the inner positioning frame, preventing groundwater from infiltrating along the interface between the rubber sleeve and concrete.

[0016] Preferably, air holes are provided in the rubber pad to further cushion the impact.

[0017] In a further extension of the present scheme, a function similar to that of a single inner positioning frame to improve the anti-floating effect of anti-floating piles can be realized on a double inner positioning frame structure. Preferably, an outer positioning frame is provided with an opening, one end of the opening is connected to the rubber casing, and the other end is located at the contact part between the outer positioning frame and the wall of the steel anchor hanging hole. The hole is filled with a rubber strip. During high-pressure pouring, the rubber strip will be squeezed out of the outer positioning frame by the slurry pressure, and slide to form a groove at the hole wall and the surface of the anti-floating pile, thereby destroying the interface between the hole wall of the anti-floating pile, and then be filled with high-pressure grouting. After solidification, the friction between the anti-floating pile and the soil layer is increased.

[0018] The present invention provides an anchor rod positioning retainer for the manufacture of cast-in-place anti-floating piles. The positioning retainer is designed as a hydraulically actuated structure by utilizing the process characteristics of secondary high-pressure grouting during the construction of anti-floating piles. A thick layer of concrete slurry film is added to the retainer to effectively prevent groundwater from infiltrating along the positioning retainer and corroding the steel anchor rods. In addition, the anti-floating performance of the anti-floating piles is improved in a further expansion plan. Description of the drawings:

[0019] Figure 1 It is a top view structural schematic diagram of a specific embodiment 1 of the anchor rod positioning retainer used for manufacturing cast-in-place anti-floating piles of the present invention;

[0020] Figure 2 This is a structural schematic diagram of a specific embodiment 2 of an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to the present invention;

[0021] Figure 3 This is a schematic diagram of the top view of the structure of a specific embodiment 2 of the anchor rod positioning retainer used for manufacturing cast-in-place anti-floating piles of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a specific embodiment 3 of the anchor rod positioning retainer used for manufacturing cast-in-place anti-floating piles of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a fourth specific embodiment of an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to the present invention;

[0024] Figure 6The diagram is a top view of the structure of a fourth specific embodiment of the anchor rod positioning retainer used for manufacturing cast-in-place anti-floating piles according to the present invention.

[0025] In the figure: inner positioning frame 1, slot 101, pipe hole seal 102, outer positioning frame 2, rubber layer 201, rubber pad 202, rubber strip 203, rubber pipe sleeve 3, steel bar anchor rod 4, high-pressure grouting pipe 5. Specific implementation method: Specific embodiment one:

[0027] The invention discloses an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles, comprising an inner positioning frame 1, an outer positioning frame 2 and a positioning frame connector.

[0028] Among them, the inner positioning frame 1 is formed by bending a steel pipe, the outer positioning frame 2 is formed by bending a steel bar, and the positioning connector is a rubber tube sleeve, which is sleeved on the outer end of the inner positioning frame 1 and the connecting end of the outer positioning frame 2 to connect and fix the inner positioning frame 1 and the outer positioning frame 2.

[0029] The inner end of the inner positioning frame 1 is used to be tied to the steel anchor rod 4 to achieve the connection and fixation of the positioning retaining frame and the steel anchor rod 4. The inner end pipe hole of the inner positioning frame 1 is sealed 102, and a groove 101 is opened in the direction of the secondary grouting pipe. When the secondary grouting pipe is grouting, the slurry is connected to the inner positioning frame 1 along the groove 101 and injected into the rubber sleeve 3 through the inner positioning frame 1.

[0030] In this solution, the length, bending angle and size of the inner positioning frame 1, the outer positioning frame 2 and the rubber tube sleeve are specifically designed according to the number, diameter, spacing and anti-floating piles and hole diameter of the steel anchor rods 4, and the corresponding materials are cut and bent into shape, and spliced ​​and put into use at the construction site. During installation, 3-4 positioning retaining frames are grouped together and evenly bundled around the steel anchor rods 4.

[0031] After the positioning and retaining frame is hoisted, two groutings are still carried out according to the existing construction method. The first one is normal pressure grouting. The grouting pipe is extended into the bottom of the pile hole. The pipe mouth is lifted while grouting, and the pipe mouth is always kept below the grouting liquid surface. Three to four hours after the normal pressure grouting is completed, high pressure grouting is carried out through the high pressure grouting pipe 5 until the slurry overflows at the top of the anti-floating pile. During high pressure grouting, the slurry output by the high pressure grouting pipe 5 enters the inner positioning frame 1 pipe along the slot 101 of the inner positioning frame 1, and is input into the rubber sleeve 3. The slurry pressure pushes the outer positioning frame 2 and the rubber sleeve 3, so that the outer positioning frame 2 moves away from the inner positioning frame 1, and the rubber sleeve 3 expands to form a grouting layer with a thickness of 3 to 5 mm. Since the normal pressure grouting slurry is not completely solidified at this time, the structural strength is low. Under the above action caused by high pressure grouting, cracks will be generated. After the cracks are discharged from the high pressure grouting pipe 5 and the air squeezed out by the high pressure grouting inside the inner positioning frame 1, they are filled with high pressure grouting slurry, so that there are no air holes in the anti-floating pile. During the period from when the pump is stopped after high-pressure grouting is completed to when the grouting is completely solidified, the rubber sleeve 3 rebounds and shrinks, so that the grouting layer inside the rubber sleeve 3 and between the inner positioning frame 1 and the outer positioning frame 2 maintains its thickness and does not shrink. After the grouting layer solidifies, a water-blocking layer is formed between the inner positioning frame 1 and the outer positioning frame 2, thereby preventing groundwater from rusting along the positioning frames and invading the interior of the anti-floating piles, causing damage to the steel anchor rod 4. Specific embodiment 2:

[0033] The invention discloses an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles, comprising an inner positioning frame 1, an outer positioning frame 2 and a positioning frame connector.

[0034] Among them, the inner positioning frame 1 is formed by bending a steel pipe, the outer positioning frame 2 is formed by bending a steel bar, and the positioning connector is a rubber tube sleeve, which is sleeved on the outer end of the inner positioning frame 1 and the connecting end of the outer positioning frame 2 to connect and fix the inner positioning frame 1 and the outer positioning frame 2.

[0035] The inner end of the inner positioning frame 1 is used to be tied to the steel anchor rod 4 to achieve the connection and fixation of the positioning retaining frame and the steel anchor rod 4. The inner end pipe hole of the inner positioning frame 1 is sealed 102, and a groove 101 is opened in the direction of the secondary grouting pipe. When the secondary grouting pipe is grouting, the slurry is connected to the inner positioning frame 1 along the groove 101 and injected into the rubber sleeve 3 through the inner positioning frame 1.

[0036] There are two inner positioning frames 1, which are respectively located above and below the outer positioning frame 2 when the positioning frame is hoisted into the hole with the steel anchor 4. This scheme is closest to the existing positioning frame structure in this case, and the anchor rod straightening effect is better than the above-mentioned single inner positioning frame 1 scheme.

[0037] The outer positioning frame 2 is wrapped with a rubber layer 201, and the rubber layer 201 forms a rubber pad 202 in the rubber tube sleeve. The rubber pad 202 is used to buffer the inevitable vibration of subsequent construction and prevent the water-blocking layer formed by the solidification of the grouting layer from being impacted by the outer positioning frame 2 in contact with the outer soil layer of the anti-floating pile under vibration and causing cracks.

[0038] The rubber layer 201 is bonded and fixed to the rubber sleeve 3 or manufactured as a whole. Under this structure, the rubber sleeve is fixedly connected to the outer positioning frame 2, and the production of prefabricated parts is more easily standardized to prevent the connection from failing and falling off. In addition, during high-pressure grouting, the rubber sleeve will be pushed outward with the outer positioning frame 2 and will be out of contact with the inner positioning frame 1, preventing groundwater from infiltrating along the interface between the rubber sleeve and concrete.

[0039] The rubber pad 202 is provided with air holes to further cushion the impact. Specific embodiment three:

[0041] The invention discloses an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles, comprising an inner positioning frame 1, an outer positioning frame 2 and a positioning frame connector.

[0042] Among them, the inner positioning frame 1 is formed by bending a steel pipe, the outer positioning frame 2 is formed by bending a steel bar, and the positioning connector is a rubber tube sleeve, which is sleeved on the outer end of the inner positioning frame 1 and the connecting end of the outer positioning frame 2 to connect and fix the inner positioning frame 1 and the outer positioning frame 2.

[0043] The inner end of the inner positioning frame 1 is used to be tied to the steel anchor rod 4 to achieve the connection and fixation of the positioning retaining frame and the steel anchor rod 4. The inner end pipe hole of the inner positioning frame 1 is sealed 102, and a groove 101 is opened in the direction of the secondary grouting pipe. When the secondary grouting pipe is grouting, the slurry is connected to the inner positioning frame 1 along the groove 101 and injected into the rubber sleeve 3 through the inner positioning frame 1.

[0044] There is one inner positioning frame 1, and when the positioning and retaining frame is hoisted into the hole with the steel anchor rod 4, the inner positioning frame 1 is located below the outer positioning frame 2. Under this structure, the outer positioning frame 2 will greatly push outward and wedge into the side wall of the pile hole during high-pressure grouting, destroying the smooth interface between the anti-floating pile and the soil, thereby increasing the friction between the anti-floating pile and the soil layer and improving the anti-floating performance of the anti-floating pile. When using this solution, since the outer positioning frame 2 is only supported on one side, the effect of straightening the steel anchor rod 4 is poor, so it needs to be mixed with other positioning frames with better straightening effects, and is only suitable for being set at the lower part of the steel anchor rod 4 with a lower degree of eccentricity when hoisted. Specific embodiment four:

[0046] The invention discloses an anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles, comprising an inner positioning frame 1, an outer positioning frame 2 and a positioning frame connector.

[0047] Among them, the inner positioning frame 1 is formed by bending a steel pipe, the outer positioning frame 2 is formed by bending a steel bar, and the positioning connector is a rubber tube sleeve, which is sleeved on the outer end of the inner positioning frame 1 and the connecting end of the outer positioning frame 2 to connect and fix the inner positioning frame 1 and the outer positioning frame 2.

[0048] The inner end of the inner positioning frame 1 is used to be tied to the steel anchor rod 4 to achieve the connection and fixation of the positioning retaining frame and the steel anchor rod 4. The inner end pipe hole of the inner positioning frame 1 is sealed 102, and a groove 101 is opened in the direction of the secondary grouting pipe. When the secondary grouting pipe is grouting, the slurry is connected to the inner positioning frame 1 along the groove 101 and injected into the rubber sleeve 3 through the inner positioning frame 1.

[0049] There are two inner positioning frames 1, which are respectively located above and below the outer positioning frame 2 when the positioning frame is hoisted into the hole with the steel anchor 4. This scheme is closest to the existing positioning frame structure in this case, and the anchor rod straightening effect is better than the above-mentioned single inner positioning frame 1 scheme.

[0050] The outer positioning frame 2 is provided with an opening, one end of the opening is connected to the rubber sleeve 3, and the other end is located at the contact part between the outer positioning frame 2 and the wall of the hanging hole of the steel anchor rod 4. The hole is filled with a rubber strip 203. During high-pressure pouring, the rubber strip 203 will be squeezed out of the outer positioning frame 2 by the slurry pressure, and slide to form a groove at the hole wall and the surface of the anti-floating pile, thereby destroying the interface between the hole wall of the anti-floating pile, and then being filled with high-pressure grouting. After solidification, the friction between the anti-floating pile and the soil layer is increased.

Claims

1. An anchor rod positioning retainer for the manufacture of cast-in-place anti-floating piles, characterized in that: It includes an inner positioning frame, an outer positioning frame and a positioning frame connector; The inner positioning frame is formed by bending a steel pipe, the outer positioning frame is formed by bending a steel bar, and the positioning connector is a rubber tube sleeve, which is sleeved on the outer end of the inner positioning frame and the connecting end of the outer positioning frame to connect and fix the inner positioning frame and the outer positioning frame; The inner end of the inner positioning frame is used to be tied to the steel anchor rod to achieve the connection and fixation of the positioning retaining frame and the steel anchor rod. The pipe hole at the inner end of the inner positioning frame is sealed and grooved in the direction of the secondary grouting pipe. When the secondary grouting pipe is grouting, the slurry is connected to the inner positioning frame along the groove and injected into the rubber casing through the inner positioning frame.

2. The anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to claim 1, characterized in that: The inner positioning frame is provided with one, and when the positioning retaining frame is hoisted into the hole along with the steel bar anchor rod, the inner positioning frame is located below the outer positioning frame.

3. The anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to claim 1, characterized in that: There are two inner positioning frames, which are respectively located above and below the outer positioning frame when the positioning retaining frame is hoisted into the hole along with the steel bar anchor rod.

4. The anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to claim 3, characterized in that: The outer portion of the outer positioning frame is wrapped with a rubber layer, and the rubber layer forms a rubber pad in the rubber tube sleeve.

5. The anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to claim 4, characterized in that: The rubber layer and the rubber sleeve are bonded and fixed or manufactured as a whole.

6. The anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to claim 4 or 5, characterized in that: The rubber pad is provided with air holes.

7. The anchor rod positioning retainer for manufacturing cast-in-place anti-floating piles according to claim 3, characterized in that: The outer positioning frame is provided with an opening, one end of the opening is connected to the rubber sleeve, and the other end is located at the contact part between the outer positioning frame and the wall of the steel bar anchor rod hanging hole, and the hole is filled with a rubber strip.

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