CN103469792B - Method for conducting grouting construction at back of pile bottom of cast-in-place pile - Google Patents
Method for conducting grouting construction at back of pile bottom of cast-in-place pile Download PDFInfo
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- CN103469792B CN103469792B CN201310404274.2A CN201310404274A CN103469792B CN 103469792 B CN103469792 B CN 103469792B CN 201310404274 A CN201310404274 A CN 201310404274A CN 103469792 B CN103469792 B CN 103469792B
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Abstract
A method for conducting grouting construction at the back of the pile bottom of a cast-in-place pile sequentially includes the following steps: (1) manufacturing and arranging a grouting pipe which comprises a plurality of grouting steel pipe sections sequentially connected from top to bottom with the lower end of the lowest grouting steel pipe section connected with a grouting spraying nozzle; (2) assembling a grouting station and a slurry transportation pipeline; (3) grouting. The method is characterized in that the grouting spraying nozzle used in the step (1) comprises a slurry spraying pipe body, a slurry inlet is formed in the upper end of the slurry spraying pipe body, a plurality of slurry discharging holes are formed in the lateral wall of the slurry spraying pipe body, a grouting one-way valve is installed on the slurry discharging holes, a sand wrapping device is arranged on the outside of the slurry spraying pipe body, a sand isolation layer is arranged between the sand wrapping device and the outer side of the slurry spraying pipe body, and the sand isolation layer covers the grouting one-way valve. When the grouting spraying nozzle reaches the bottom of a pile hole, and the portion of the upper end of the grouting pipe higher than the ground reaches preset height, the upper end of the grouting pipe is fixedly connected with a protection barrel at the top of the pile hole. By means of the method, smooth grouting can be achieved, grouting quality is ensured, and success ratio is ensured.
Description
Technical field
The present invention relates to the construction method of foundation pile of building, be specifically related to a kind of grout pile bottom post-grouting construction method.
Background technology
Castinplace pile because its bearing capacity is high, applicability is strong, be widely used in construction work, but the defect of castinplace pile also can cause bearing capacity of single pile not enough due to reason in a certain respect.Post Grouting Technique is a kind of auxiliary process of filling pile construction, effectively can make up the defect of castinplace pile, improves the bearing capacity of single pile.Grout pile bottom post-grouting means: when after concrete bored pile piling, pile concrete reaches some strength, by grouting behind shaft or drift lining equipment, cement paste pressurization is injected at the bottom of stake, ooze expansion, splitting, filling, densification and consolidation by cement paste, eliminate the two large defects such as the intrinsic pile body mud skin of castinplace pile and pile bottom sediment (roach).Adopt Injection Technology under Pile, fundamentally can solve pile body mud skin and pile bottom sediment to affect cast-in-place pile concrete pouring quality, reduce the technical barrier of bearing capacity of pile tip, effectively make up the defect of castinplace pile, improve the bearing capacity of single pile, reduce the sedimentation of pile foundation, guarantee that pile foundation engineering quality is significant.
At present, usually, after stake holes (pore-forming is clear hole also) is bored in injection, Grouting Pipe is fixed on inside reinforcing cage by the mode of colligation or welding, synchronously puts into stake holes, the slip casting injector head of Grouting Pipe lower end extends at the bottom of stake holes, and about 20 centimetres, stake holes mouth is exposed at Grouting Pipe top; Clear hole placing of concrete subsequently, pile implements grouting behind shaft or drift lining operation in 2 days afterwards.Grouting behind shaft or drift lining equipment used comprises slip casting station, grout pipe line and above-mentioned Grouting Pipe.Slip casting station generally includes high-pressure injection pump, cement mixer, slurries filtration facility and water storage box, wherein cement mixer is for preparing cement paste, slurries filtration facility is used for the impurity in elimination cement paste, and cement paste is sent from slip casting station with certain pressure by high-pressure injection pump.Grouting Pipe comprises the more piece slip casting lengths of steel pipes (can welding or be threaded between adjacent two joint slip casting lengths of steel pipes) connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects slip casting injector head (slip casting injector head upper end connects nethermost slip casting lengths of steel pipes lower end); Slip casting injector head upper end is provided with stock inlet, the sidewall of slip casting injector head is provided with multiple slurry outlet, slurry outlet is provided with slip casting one way valve (by arranging slip casting one way valve, when carrying out pour stake body by concrete, slurries can not pour in slip casting injector head, during slip casting, cement paste also can not reflux), slip casting injector head lower end closed.Grout pipe line can adopt high pressure defeated slurry flexible pipe (high pressure defeated slurry flexible pipe refers to the defeated slurry flexible pipe that can bear high pressure), and high pressure defeated slurry flexible pipe one end connects grout outlet, the open top of other end connection Grouting Pipe of high-pressure injection pump; Grout pipe line also can be formed by connecting by defeated slurry steel pipe and the defeated slurry flexible pipe of high pressure, and the grout outlet of high-pressure injection pump is successively through the opening at defeated slurry steel pipe, high pressure defeated slurry flexible pipe connection Grouting Pipe top.High-pressure injection pump by slip casting station through filtration cement paste send, cement paste enters Grouting Pipe from Grouting Pipe open top after grout pipe line, subsequently cement paste along Grouting Pipe cavity descending and from slip casting injector head slurry outlet ejection, carry out slip casting.
But, because Grouting Pipe and reinforcing cage are fixed together, easily drive because of rising of steel cage Grouting Pipe also to float thereupon, affect carrying out smoothly of slip casting, cause slip casting failure; And; after concrete bored pile piling; the cement paste solidified often is enclosed with outside slip casting injector head; so that slip casting one way valve is not easily opened; often wheel starts to need before slip casting the slip casting one way valve that just to press off up to the high pressure clear water of 8-10MPa with pressure on slip casting injector head; and often there will be the situation of slip casting injector head blocking, cannot slip casting smoothly.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of grout pile bottom post-grouting construction method, and adopting in this way can slip casting smoothly, guarantees grouting quality and success rate.The technical scheme adopted is as follows:
A kind of grout pile bottom post-grouting construction method, comprise the steps: that (1) makes and Laying injection pipe successively, described Grouting Pipe comprises the more piece slip casting lengths of steel pipes connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects slip casting injector head; (2) slip casting station and grout pipe line is installed; (3) slip casting, is characterized in that:
In step (1), slip casting lengths of steel pipes used comprises slip casting body, slip casting injector head used comprises whitewashing body, and slip casting body upper end and whitewashing body upper end are equipped with steel bushing, and the cross section inner edge of steel bushing and the cross section outer rim shape of slip casting body and size match; Whitewashing body upper end has stock inlet, the sidewall of whitewashing body is provided with multiple slurry outlet, slurry outlet is provided with slip casting one way valve, whitewashing body lower end closed, sand Wrap device is had in the arranged outside of whitewashing body, be provided with sand separation layer between the lateral surface of sand Wrap device and whitewashing body, slip casting one way valves all on whitewashing body covers by sand separation layer;
In step (1), to make and the method for Laying injection pipe is: first the slip casting body lower end of nethermost slip casting lengths of steel pipes to be inserted in the steel bushing being located at whitewashing body upper end and to weld, nethermost slip casting lengths of steel pipes and slip casting injector head are linked together; Below each slip casting lengths of steel pipes being above adjacent section by section subsequently, a joint slip casting lengths of steel pipes connects, and the connected mode between adjacent two slip casting lengths of steel pipes is inserted the slip casting body lower end of slip casting lengths of steel pipes to be above adjacent one to save in the steel bushing of slip casting lengths of steel pipes upper end and to weld below; After often completing the welding of a joint slip casting lengths of steel pipes, Grouting Pipe is transferred along reinforcing cage inner vertical; When Grouting Pipe injector head arrives at the bottom of stake holes hole and the overhead part in Grouting Pipe upper end reaches predetermined altitude, the casing of Grouting Pipe upper end with stake holes top is fixedly connected with, thus completes the making of Grouting Pipe and lay.
Usually require that slip casting one way valve can bear the hydrostatic pressure of more than 1Mpa and have return-stopping function.
In a kind of preferred version, above-mentioned sand Wrap device comprises the reinforcing bar oversheath being enclosed within the external side of shotcrete pipe, whitewashing body lower end and all slip casting one way valves are all in the cavity of reinforcing bar oversheath, be provided with inner liner, be provided with wire gauze between inner liner and reinforcing bar oversheath inside reinforcing bar oversheath; Described sand separation layer is made up of the sand between the lateral surface being filled in inner liner and whitewashing body; Reinforcing bar oversheath adopts reinforcement welding to form, and the bottom of reinforcing bar oversheath and sidewall all have the through hole passed through for cement paste, and reinforcing bar oversheath is fixedly connected with whitewashing body.The sand of filling can be fine sand, medium sand or coarse sand.Above-mentioned reinforcing bar oversheath has higher intensity, makes sand Wrap device keep its shape, as the outer protective of sand separation layer; Above-mentioned inner liner can adopt non-woven fabrics, plastic sheeting (usually adopting multilayer plastic film) or plastic gauze (mesh size of plastic gauze should be less than the particle diameter of sand), and its effect wraps sand, prevents sand from leaking; Through hole on the bottom of reinforcing bar oversheath and sidewall is usually comparatively large, and the through hole on reinforcing bar oversheath is blocked in the effect of above-mentioned wire gauze, prevents the outside distending of inner liner, contributes to making sand separation layer keep stable.Above-mentioned reinforcing bar oversheath can be ellipsoid shape or cylindric.Usually, before heap sand, above-mentioned wire gauze and inner liner cover the bottom of reinforcing bar oversheath and the inner side of sidewall, and wire gauze upper end and inner liner upper end then have opening, so that heap sand; During Specific construction, the reinforcing bar oversheath that inner side can be provided with wire gauze and inner liner is enclosed within whitewashing body from bottom to top, then between inner liner and the lateral surface of whitewashing body, sand is inserted, after forming sand separation layer, close the opening of wire gauze upper end and inner liner upper end, then the reinforcing bar of reinforcing bar oversheath upper end and whitewashing body are welded and fixed.The sand Wrap device sound construction of said structure, can available protecting layer of sand, guarantees that the process medium sand separation layer of Laying injection pipe stands intact, thus guarantees slip casting success rate (slip casting success rate can reach 100%).
In other scheme, above-mentioned sand Wrap device also can adopt non-woven fabrics or plastic sheeting (generally adopting multilayer plastic film) to form; Utilize non-woven fabrics or plastic sheeting to wrap sand and after forming sand separation layer, adopt adhesive tape this non-woven fabrics or plastic sheeting to be fixed on whitewashing body.The advantage of this scheme is simple, is convenient to make at any time, and its shortcoming is that sand Wrap device is easily unexpected damaged, and sand may cause slip casting failure after leaking.
In step (1), during welding, the intensity of Grouting Pipe weld must be ensured, without rosin joint, dry joint, solder skip.Usually require that slip casting lengths of steel pipes and each soldering opening can bear the injection pressure of 10.0MPa.
Usually, in step (1), complete Grouting Pipe making and after laying, slip casting injector head should protrude outer 250 millimeter of reinforcing cage, and Grouting Pipe upper end must 500 millimeter above ground level.
In step (1), colligation can be adopted to fix or the casing of Grouting Pipe upper end with stake holes top is fixedly connected with by the mode of welding.
Usual above-mentioned slip casting body, whitewashing body and steel bushing all adopt round steel pipe to make.
The welding job of Grouting Pipe is carried out in order to be more convenient for, guarantee Grouting Pipe welding quality and welding position correct, in preferred version, in step (1), when making and Laying injection pipe, be provided with a Grouting Pipe welding support the casing at stake holes top is added, this Grouting Pipe welding support comprises support body and Grouting Pipe gripper shoe, Grouting Pipe gripper shoe is fixed on support body, Grouting Pipe gripper shoe is provided with circular hole and at least one bar hole, bar hole one end communicates with circular hole, the diameter of circular hole is greater than the external diameter of steel bushing, the width of bar hole is less than the external diameter of steel bushing, and the external diameter of slip casting body and whitewashing body is all less than the width of bar hole, when carrying out nethermost slip casting lengths of steel pipes with welding between slip casting injector head, the whitewashing body of slip casting injector head is made to be in the bar hole in Grouting Pipe gripper shoe, steel bushing on slip casting injector head contacts with the upper surface of Grouting Pipe gripper shoe, now Grouting Pipe gripper shoe supports slip casting injector head, carries out weld job by operating personnel, complete nethermost slip casting lengths of steel pipes with after welding between slip casting injector head, mobile Grouting Pipe welding support, circular hole in Grouting Pipe gripper shoe is aimed at the steel bushing on slip casting injector head, and Grouting Pipe is vertically transferred, the steel bushing on slip casting injector head is passed down through circular hole, subsequently, again move Grouting Pipe welding support, the slip casting body of described nethermost slip casting lengths of steel pipes is made to be in the bar hole in Grouting Pipe gripper shoe, and the steel bushing of described nethermost slip casting lengths of steel pipes is contacted with the upper surface of Grouting Pipe gripper shoe, then weld job is carried out by operating personnel, to a joint slip casting lengths of steel pipes and described nethermost slip casting lengths of steel pipes weld together above, move Grouting Pipe welding support subsequently again, circular hole in Grouting Pipe gripper shoe is aimed at the steel bushing of described nethermost slip casting lengths of steel pipes, and Grouting Pipe is vertically transferred, the steel bushing of described nethermost slip casting lengths of steel pipes is passed down through circular hole, the rest may be inferred, until complete the welding of all slip casting lengths of steel pipes, Grouting Pipe welding support is removed after completing the welding of all slip casting lengths of steel pipes.Above-mentioned Grouting Pipe welding support is simple and practical, by using above-mentioned Grouting Pipe welding support, making the welding job of row Grouting Pipe be more convenient for carrying out, can save staff, improves welding efficiency, and more easily ensures welding quality.
Usually, Grouting Pipe is transferred to precalculated position, in Grouting Pipe, fill clear water, and seals Grouting Pipe upper end open with pipe cap.
The quantity of Grouting Pipe is arranged according to the stake footpath size of castinplace pile, and usually, diameter is not more than to the stake of 1200 millimeters, should arranges 2 Grouting Pipe, these 2 Grouting Pipe are uniformly distributed along reinforcing cage circumferencial direction; Be greater than 1200 millimeters for diameter and be not more than the stake of 2500 millimeters, should arrange 3 Grouting Pipe, these 3 Grouting Pipe are uniformly distributed along reinforcing cage circumferencial direction.
In step (2), the way of installing slip casting station and grout pipe line can refer to traditional grout pile bottom post-grouting construction method.
In step (3), slip casting operation should start after 2 days by pile, generally should not be later than pile after 30 days, and the way of slip casting can refer to traditional grout pile bottom post-grouting construction method.
The present invention passes through at slip casting one way valve arranged outside sand Wrap device, and back-up sand and form sand separation layer in sand Wrap device, greatly reduce the initial pressure opened needed for slip casting one way valve, need be only the high pressure clear water of 2-3MPa with pressure before often wheel starts slip casting, the slip casting one way valve on slip casting injector head can be pressed off, slip casting one way valve is easy to just open, thus the situation having stopped the blocking of slip casting injector head occurs; Meanwhile, all have the sand of certain thickness (as 2 ~ 3 centimetres), form soft topping outside each slip casting one way valve, increase the diffusion area of cement paste, the cement paste that slip casting injector head is sprayed can more effectively, effectively flow at slip casting one-way valved outlet place; By the Grouting Pipe top of exposing a face is fixed on the casing at stake holes top, can prevents Grouting Pipe from moving up and down with reinforcing cage, avoid the harm that rising of steel cage brings to Grouting Pipe.Briefly, the present invention, by improving the making of Grouting Pipe and the mode of laying, can realize smooth slip casting, guarantee grouting quality and success rate.
Grout pile bottom post-grouting construction method of the present invention can be used for all kinds of brill, digs, the reinforcing of the certain limit soil body at the bottom of the stake of Punching Borehole Cast-in-place Concrete Pile.
Accompanying drawing explanation
Fig. 1 is the structural representation of preferred embodiment of the present invention slip casting injector head used;
Fig. 2 is the structural representation of preferred embodiment of the present invention slip casting lengths of steel pipes used;
Fig. 3 is the structural representation (top view) of preferred embodiment of the present invention Grouting Pipe welding support used.
Detailed description of the invention
This grout pile bottom post-grouting construction method comprises the steps: successively
(1) making and Laying injection pipe
Grouting Pipe comprises the more piece slip casting lengths of steel pipes connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects slip casting injector head.With reference to figure 1 and Fig. 2, slip casting lengths of steel pipes used comprises slip casting body 1, slip casting injector head used comprises whitewashing body 2, slip casting body 1 upper end is provided with steel bushing 3, whitewashing body 2 upper end is also provided with steel bushing 3, and the cross section inner edge of steel bushing 3 and the cross section outer rim shape of slip casting body 1 and size match; Whitewashing body 2 upper end has stock inlet 4, the sidewall of whitewashing body 2 is provided with multiple slurry outlet 5, slurry outlet 5 is provided with slip casting one way valve 6, whitewashing body 2 lower end closed, sand Wrap device 7 is had in the arranged outside of whitewashing body 2, be provided with sand separation layer 8 between the lateral surface of sand Wrap device 7 and whitewashing body 2, all slip casting one way valves 6 on whitewashing body 2 cover by sand separation layer 8; The thickness of sand separation layer 8 is 2 ~ 3 centimetres.Slip casting body 1, whitewashing body 2 and steel bushing 3 all adopt round steel pipe to make, and (body 2 of such as whitewashing, slip casting body 1 adopt the round steel pipe that internal diameter is 25.5 millimeters, pipe thickness is 3.0 millimeters to make; Steel bushing 3 adopts pipe thickness to be that the round steel pipe of 3.0 millimeters is made, and the length of steel bushing is 100 millimeters).Slip casting one way valve 6 can bear the hydrostatic pressure of more than 1Mpa and have return-stopping function.
In this step (1), to make and the method for Laying injection pipe is: first slip casting body 1 lower end of nethermost slip casting lengths of steel pipes to be inserted in the steel bushing 3 being located at whitewashing body 2 upper end and to weld, nethermost slip casting lengths of steel pipes and slip casting injector head are linked together; Below each slip casting lengths of steel pipes being above adjacent section by section subsequently, a joint slip casting lengths of steel pipes connects, and the connected mode between adjacent two slip casting lengths of steel pipes is inserted slip casting body 1 lower end of slip casting lengths of steel pipes to be above adjacent one to save in the steel bushing 3 of slip casting lengths of steel pipes upper end and to weld below; After often completing the welding of a joint slip casting lengths of steel pipes, Grouting Pipe is transferred along reinforcing cage inner vertical; When Grouting Pipe injector head arrives at the bottom of stake holes hole and the overhead part in Grouting Pipe upper end reaches predetermined altitude (such as, 500 millimeters above ground level of Grouting Pipe upper end), Grouting Pipe upper end is fixedly connected with the casing at stake holes top (colligation can be adopted to fix or the casing of Grouting Pipe upper end with stake holes top is fixedly connected with by the mode of welding), thus completes the making of Grouting Pipe and lay.During welding, must ensure the intensity of Grouting Pipe weld, without rosin joint, dry joint, solder skip, each soldering opening can bear the injection pressure of 10.0MPa.
In step (1), when making and Laying injection pipe, be provided with a Grouting Pipe welding support the casing at stake holes top is added, with reference to figure 3, this Grouting Pipe welding support comprises support body 9 and Grouting Pipe gripper shoe 10, Grouting Pipe gripper shoe 10 is fixed on support body 9, Grouting Pipe gripper shoe 10 is provided with circular hole 11 and two bar holes 12, two bar holes 12 respectively have one end to communicate with circular hole 11, the diameter of circular hole 11 is greater than the external diameter of steel bushing 3, the width of bar hole 12 is less than the external diameter of steel bushing 3, and the external diameter of slip casting body 1 and whitewashing body 2 is all less than the width of bar hole 12, in the present embodiment, support body 9 is formed by connecting (bar 92 two ends that reinforce the connection are fixedly connected with two support bars 91 respectively) by two support bars 91 with two bars 92 that reinforce the connection, two support bars 91 are parallel to each other, Grouting Pipe gripper shoe 10 both sides are fixedly connected with two support bars 91 respectively, and the length of support bar 91 is greater than the external diameter of the casing at above-mentioned stake holes top.When carrying out nethermost slip casting lengths of steel pipes with welding between slip casting injector head, in the bar hole 12 that the whitewashing body 2 of slip casting injector head is in Grouting Pipe gripper shoe 10, steel bushing 3 on slip casting injector head contacts with the upper surface of Grouting Pipe gripper shoe 10, now Grouting Pipe gripper shoe 10 supports slip casting injector head, carries out weld job by operating personnel, complete nethermost slip casting lengths of steel pipes with after welding between slip casting injector head, mobile Grouting Pipe welding support, circular hole 11 in Grouting Pipe gripper shoe 10 is aimed at the steel bushing 3 on slip casting injector head, and Grouting Pipe is vertically transferred, the steel bushing 3 on slip casting injector head is passed down through circular hole 11, subsequently, again move Grouting Pipe welding support, the slip casting body 1 of described nethermost slip casting lengths of steel pipes is made to be in the bar hole 12 in Grouting Pipe gripper shoe 10, and the steel bushing 3 of described nethermost slip casting lengths of steel pipes is contacted with the upper surface of Grouting Pipe gripper shoe 10, then weld job is carried out by operating personnel, to a joint slip casting lengths of steel pipes and described nethermost slip casting lengths of steel pipes weld together above, move Grouting Pipe welding support subsequently again, circular hole 11 in Grouting Pipe gripper shoe 10 is aimed at the steel bushing 3 of described nethermost slip casting lengths of steel pipes, and Grouting Pipe is vertically transferred, the steel bushing 3 of described nethermost slip casting lengths of steel pipes is passed down through circular hole 11, the rest may be inferred, until complete the welding of all slip casting lengths of steel pipes, Grouting Pipe welding support is removed after completing the welding of all slip casting lengths of steel pipes.
With reference to figure 1, in the present embodiment, sand Wrap device 7 comprises the reinforcing bar oversheath 71 be enclosed within outside whitewashing body 2, whitewashing body 2 lower end and all slip casting one way valves 6 are all in the cavity of reinforcing bar oversheath 71, be provided with inner liner 72 inside reinforcing bar oversheath 71, between inner liner 72 and reinforcing bar oversheath 71, be provided with wire gauze 73; Described sand separation layer 8 is made up of the sand between the lateral surface being filled in inner liner 72 and whitewashing body 2; Reinforcing bar oversheath 71 adopts reinforcement welding to form, and the bottom of reinforcing bar oversheath 71 and sidewall all have the through hole passed through for cement paste, and reinforcing bar oversheath 71 is fixedly connected with whitewashing body 2.The sand of filling can be fine sand, medium sand or coarse sand.Inner liner 72 can adopt non-woven fabrics, plastic sheeting (usually adopting multilayer plastic film) or plastic gauze (mesh size of plastic gauze should be less than the particle diameter of sand).Before heap sand, wire gauze 73 and inner liner 72 cover the bottom of reinforcing bar oversheath 71 and the inner side of sidewall, and wire gauze 73 upper end and inner liner 72 upper end then have opening, so that heap sand; During Specific construction, the reinforcing bar oversheath 71 inner side being provided with wire gauze 73 and inner liner 72 is enclosed within whitewashing body 2 from bottom to top, then between inner liner 72 and the lateral surface of whitewashing body 2, sand is inserted, after forming sand separation layer 8, close the opening of wire gauze 73 upper end and inner liner 73 upper end, then the reinforcing bar of reinforcing bar oversheath 71 upper end and whitewashing body 2 are welded and fixed.
Grouting Pipe is transferred to precalculated position, in Grouting Pipe, fill clear water, and seals Grouting Pipe upper end open with pipe cap.
The quantity of Grouting Pipe is arranged according to the stake footpath size of castinplace pile, and such as: stake diameter being not more than to 1200 millimeters, should arrange 2 Grouting Pipe, these 2 Grouting Pipe are uniformly distributed along reinforcing cage circumferencial direction; Be greater than 1200 millimeters for diameter and be not more than the stake of 2500 millimeters, should arrange 3 Grouting Pipe, these 3 Grouting Pipe are uniformly distributed along reinforcing cage circumferencial direction.
(2) slip casting station and grout pipe line is installed
In this step (2), installing slip casting station is consistent with prior art with the way of grout pipe line, can refer to traditional grout pile bottom post-grouting construction method, is not further described at this.
(3) slip casting
Slip casting operation should start after 2 days by pile, generally should not be later than pile after 30 days.In this step (3), the way of slip casting is consistent with prior art, can refer to traditional grout pile bottom post-grouting construction method, is not further described at this.During grout injection, water under high pressure mud is through sand separation layer 6, inner liner 72(when inner liner 72 adopts non-woven fabrics or plastic sheeting, and water under high pressure mud can break through inner liner 72), inject at the bottom of stake after wire gauze 73, reinforcing bar oversheath 71.
In other scheme, the sand Wrap device in step (1) also can adopt non-woven fabrics or plastic sheeting (generally adopting multilayer plastic film) to form; Utilize non-woven fabrics or plastic sheeting to wrap sand and after forming sand separation layer, adopt adhesive tape this non-woven fabrics or plastic sheeting to be fixed on whitewashing body.
Claims (4)
1. a grout pile bottom post-grouting construction method, comprise the steps: that (1) makes and Laying injection pipe successively, described Grouting Pipe comprises the more piece slip casting lengths of steel pipes connected successively from top to bottom, and nethermost slip casting lengths of steel pipes lower end connects slip casting injector head; (2) slip casting station and grout pipe line is installed; (3) slip casting, is characterized in that:
In step (1), slip casting lengths of steel pipes used comprises slip casting body, slip casting injector head used comprises whitewashing body, and slip casting body upper end and whitewashing body upper end are equipped with steel bushing, and the cross section inner edge of steel bushing and the cross section outer rim shape of slip casting body and size match; Whitewashing body upper end has stock inlet, the sidewall of whitewashing body is provided with multiple slurry outlet, slurry outlet is provided with slip casting one way valve, whitewashing body lower end closed, sand Wrap device is had in the arranged outside of whitewashing body, be provided with sand separation layer between the lateral surface of sand Wrap device and whitewashing body, slip casting one way valves all on whitewashing body covers by sand separation layer;
Described sand Wrap device comprises the reinforcing bar oversheath being enclosed within the external side of shotcrete pipe, and whitewashing body lower end and all slip casting one way valves are all in the cavity of reinforcing bar oversheath, be provided with inner liner, be provided with wire gauze between inner liner and reinforcing bar oversheath inside reinforcing bar oversheath; Described sand separation layer is made up of the sand between the lateral surface being filled in inner liner and whitewashing body; Reinforcing bar oversheath adopts reinforcement welding to form, and the bottom of reinforcing bar oversheath and sidewall all have the through hole passed through for cement paste, and reinforcing bar oversheath is fixedly connected with whitewashing body;
In step (1), to make and the method for Laying injection pipe is: first the slip casting body lower end of nethermost slip casting lengths of steel pipes to be inserted in the steel bushing being located at whitewashing body upper end and to weld, nethermost slip casting lengths of steel pipes and slip casting injector head are linked together; Below each slip casting lengths of steel pipes being above adjacent section by section subsequently, a joint slip casting lengths of steel pipes connects, and the connected mode between adjacent two slip casting lengths of steel pipes is inserted the slip casting body lower end of slip casting lengths of steel pipes to be above adjacent one to save in the steel bushing of slip casting lengths of steel pipes upper end and to weld below; After often completing the welding of a joint slip casting lengths of steel pipes, Grouting Pipe is transferred along reinforcing cage inner vertical; When Grouting Pipe injector head arrives at the bottom of stake holes hole and the overhead part in Grouting Pipe upper end reaches predetermined altitude, the casing of Grouting Pipe upper end with stake holes top is fixedly connected with, thus completes the making of Grouting Pipe and lay.
2. grout pile bottom post-grouting construction method according to claim 1, is characterized in that: described inner liner is non-woven fabrics, plastic sheeting or plastic gauze.
3. grout pile bottom post-grouting construction method according to claim 1 and 2, is characterized in that: in step (1), adopts colligation to fix or the casing of Grouting Pipe upper end with stake holes top is fixedly connected with by the mode of welding.
4. grout pile bottom post-grouting construction method according to claim 1 and 2, is characterized in that: described slip casting body, whitewashing body and steel bushing all adopt round steel pipe to make, in step (1), when making and Laying injection pipe, be provided with a Grouting Pipe welding support the casing at stake holes top is added, this Grouting Pipe welding support comprises support body and Grouting Pipe gripper shoe, Grouting Pipe gripper shoe is fixed on support body, Grouting Pipe gripper shoe is provided with circular hole and at least one bar hole, bar hole one end communicates with circular hole, the diameter of circular hole is greater than the external diameter of steel bushing, the width of bar hole is less than the external diameter of steel bushing, and the external diameter of slip casting body and whitewashing body is all less than the width of bar hole, when carrying out nethermost slip casting lengths of steel pipes with welding between slip casting injector head, the whitewashing body of slip casting injector head is made to be in the bar hole in Grouting Pipe gripper shoe, steel bushing on slip casting injector head contacts with the upper surface of Grouting Pipe gripper shoe, now Grouting Pipe gripper shoe supports slip casting injector head, carries out weld job by operating personnel, complete nethermost slip casting lengths of steel pipes with after welding between slip casting injector head, mobile Grouting Pipe welding support, circular hole in Grouting Pipe gripper shoe is aimed at the steel bushing on slip casting injector head, and Grouting Pipe is vertically transferred, the steel bushing on slip casting injector head is passed down through circular hole, subsequently, again move Grouting Pipe welding support, the slip casting body of described nethermost slip casting lengths of steel pipes is made to be in the bar hole in Grouting Pipe gripper shoe, and the steel bushing of described nethermost slip casting lengths of steel pipes is contacted with the upper surface of Grouting Pipe gripper shoe, then weld job is carried out by operating personnel, to a joint slip casting lengths of steel pipes and described nethermost slip casting lengths of steel pipes weld together above, move Grouting Pipe welding support subsequently again, circular hole in Grouting Pipe gripper shoe is aimed at the steel bushing of described nethermost slip casting lengths of steel pipes, and Grouting Pipe is vertically transferred, the steel bushing of described nethermost slip casting lengths of steel pipes is passed down through circular hole, the rest may be inferred, until complete the welding of all slip casting lengths of steel pipes, Grouting Pipe welding support is removed after completing the welding of all slip casting lengths of steel pipes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310404274.2A CN103469792B (en) | 2013-09-09 | 2013-09-09 | Method for conducting grouting construction at back of pile bottom of cast-in-place pile |
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| CN201310404274.2A CN103469792B (en) | 2013-09-09 | 2013-09-09 | Method for conducting grouting construction at back of pile bottom of cast-in-place pile |
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| CN103924584B (en) * | 2014-03-14 | 2016-02-03 | 浙江新邦建设有限公司 | The construction method of bored pile |
| CN105220687B (en) * | 2014-06-30 | 2017-04-05 | 中国一冶集团有限公司 | Prestressed concrete pipe pile grouting behind shaft or drift lining method fills core reinforcing construction method |
| CN104532832A (en) * | 2014-11-20 | 2015-04-22 | 上海智岛建筑科技有限公司 | Steel retaining cylinder and application method thereof |
| CN104612134A (en) * | 2014-12-16 | 2015-05-13 | 中铁建大桥工程局集团第五工程有限公司 | Cast-in place pile post-grouting construction method for pouring construction |
| CN108677939B (en) * | 2018-06-07 | 2020-11-27 | 上海勘察设计研究院(集团)有限公司 | Pile end post-grouting failure handling method and device |
| CN218990144U (en) * | 2021-08-09 | 2023-05-09 | 高永光 | Pile end bottom grouting device and cast-in-place pile |
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| JP3107458B2 (en) * | 1992-06-24 | 2000-11-06 | 英明 岸田 | Confirmation and increase method of bearing capacity of cast-in-place pile |
| CN201411688Y (en) * | 2009-02-25 | 2010-02-24 | 河海大学 | Reinforcing thick coating deep-burying soft-soil reducing plastic sleeve composite pile |
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Inventor after: Wang Jianzhong Inventor after: Lin Qingbo Inventor after: Chen Qingjin Inventor after: Lin Mao Inventor after: Chen Linyao Inventor after: Zhang Kesheng Inventor after: Xiao Zhijian Inventor after: Ding Feifei Inventor before: Lin Qingbo Inventor before: Chen Qingjin Inventor before: Lin Mao Inventor before: Chen Linyao Inventor before: Zhang Kesheng Inventor before: Xiao Zhijian Inventor before: Ding Feifei |