CN2272459Y

CN2272459Y - Pile-side mortar-pressing device for mud wall-protection pouring pile

Info

Publication number: CN2272459Y
Application number: CN 95207690
Authority: CN
Inventors: 刘金砺; 祝经成
Original assignee: Foundation Research Institute Of China Academy Of Building Research
Current assignee: Foundation Research Institute Of China Academy Of Building Research
Priority date: 1995-04-10
Filing date: 1995-04-10
Publication date: 1998-01-14
Anticipated expiration: 2005-04-10

Abstract

The utility model relates to a pile-side mortar-pressing device for mud wall-protection pouring piles, composed of a prefabricated reinforcing cage, a mortar-pressing steel conduit and a one-way valve. The utility model is characterized in that the mortar-pressing steel conduit is longitudinally arranged in the prefabricated reinforcing cage, the outer side of the prefabricated reinforcing cage is circularly (petal-shaped) or longitudinally (wave-shaped) provided with a PVC reinforcing elastic hose. The extruding position of the hose is provided with the mortar-pressing one-way valve, and the mortar-pressing one-way valve can be arranged along a pile or on a plurality of cross sections according to needs. The mortar-pressing time is not limited by the time of shaping the pile, and the on-site operation is simple. The bearing capacity of one pile can be improved by 50-100%, the engineering cost of a pile foundation is saved, and the construction period is shortened. The engineering quality is ensured, and the utility model is suitable for pile foundation engineering.

Description

Slurry drilled pile stake side pressure sizing device

The utility model belongs to pile foundation engineering construction application apparatus, is used to improve bearing capacity of pile foundation and quality.

Slurry drilled pile is a kind of main stake type of building and bridge deep foundation, it is long to reach 100 meters, stake footpath can reach 3 meters, and bearing capacity of single pile reaches as high as thousands of tons of, but heavy become silted up and stake side mud skin is the hard nut to crack that influence the stable and bearing capacity of this class quality of pile in the stake end that formation of pile forms.In order to address this problem, at the bottom of European countries such as Britain once adopted, stake side pressure slurry technology.But the squeezing unit complexity that they adopted and valency height; its side pressure sizing device is to set up mud jacking steel pipe with holes on reinforcing cage; must in 2 days, implement mud jacking behind the pile; the concrete cover that intensity is also lower breaks through; the success rate of this mud jacking technology only is about 80%; and owing to must behind pile, implement in 2 days, form and intersect with the pile operation, very not convenient.For the bigger castinplace pile of draw ratio l/d, therefore its bearing capacity adopts effective squeezing unit to carry out stake side pressure slurry based on pile side resistance, and its economic benefit will be very remarkable.

The purpose of this utility model is, designs a kind of novel slurry drilled pile stake side pressure sizing device, can prevent from that the deep layer hydrostatic pressure from damaging grout valve by pressure to enter earth, again can be smoothly with in the slurries pressure pile side soil body.This device is the arranged outside elastic hose at precast reinforced cage, the mud jacking one way valve is set on the flexible pipe, any time behind pile, by the mud jacking steel conduit in the precast reinforced cage, go into cement paste liquid to the stake side pressure, cement grout infiltrates the soil body, form the very high induration of intensity that surrounds pile body, not only eliminated the mud skin that adheres to the stake surface, and made a side soil obtain reinforcing, thereby bearing capacity is increased substantially.

Slurry drilled pile stake side pressure sizing device of the present utility model, form by precast reinforced cage, mud jacking steel conduit, one way valve, be divided into A type and Type B, it is characterized in that (A type): the mud jacking steel conduit vertically is arranged in the precast reinforced cage, arrange two to four along stake week, the stake top is stretched out in the upper end, and the lower end is provided with the back taper slip casting interface that stretches out to both sides of inverted T-shape; Be arranged circumferentially PVC reinforcement elastic hose in the precast reinforced cage outside, flexible pipe is petal super stake footpath symmetry and protrudes, and protrudes the position mud jacking one way valve is set, with precast reinforced cage contact position, flexible pipe is pegged graft with the back taper interface of mud jacking steel conduit lower end and is connected, and forms closed circuit.

Slurry drilled pile stake side pressure sizing device (Type B) is arranged circumferentially three to four mud jacking steel conduits according to stake footpath size along reinforcing cage, and the stake top is stretched out in the upper end; In the bottom of mud jacking steel conduit, connect and be the PVC reinforcement flexible pipe that vertical waveform is provided with, the trough of flexible pipe is fixed by finer wire and precast reinforced cage colligation, and the crest place of flexible pipe is provided with the mud jacking one way valve.

Described mud jacking one way valve is to be arranged circumferentially 1-2 row plasma discharge hole on PVC reinforcement flexible pipe, and inverted drawing pin or steel ball, outer coated high pressure adhesive waterproof tape and rubber pneumatic tyre are placed by the place in the plasma discharge hole.

Slurry drilled pile stake side pressure sizing device of the present utility model, owing to be the PVC reinforcement elastic hose that petal symmetry is protruded in precast reinforced cage arranged outside, the projection diameter is greater than the stake footpath, can make transfer precast reinforced cage fluid concrete in the construction after, mud jacking one way valve on the flexible pipe is close to the pile lining soil body all the time, be convenient to cement grout and inject the stake side, be not subjected to the constraint of pile concrete, the mud jacking success rate can reach 100%; The mud jacking valve can be as required gone up along stake long (Type B) or at some sections (A type) and is provided with, the time of mud jacking be not subjected to the time behind the pile restriction (with in seven days for good), operation site is convenient; The madjack pipe of this device, valve are provided with simply, and surcharge is low; Grouting result is good, generally can make pile side resistance improve 50-100%, with condition that pile base grouting combines under, can improve bearing capacity of single pile 50-100%, thereby reduce the stake number significantly, it is long to reduce stake, save the pile foundation engineering cost, the reduction of erection time, guarantee the pile foundation engineering quality.

Slurry drilled pile stake side pressure sizing device of the present utility model is applicable to mud jacking behind the slurry drilled pile, also is applicable to the back mud jacking of doing the operation drilled pile.

Below in conjunction with drawings and Examples slurry drilled pile stake side pressure sizing device is further described.

Fig. 1 is arranged circumferentially (A type) working drawing for the PVC reinforcement flexible pipe of slurry drilled pile stake side pressure sizing device

Fig. 2 is the I-I section of Fig. 1

Fig. 3 is a node A enlarged detail among Fig. 2

Fig. 4 is a Node B enlarged detail among Fig. 2

Fig. 5 vertically is provided with (Type B) working drawing for the PVC reinforcement flexible pipe of slurry drilled pile stake side pressure sizing device

Fig. 6 is Fig. 5 II-II sectional drawing

As can be seen, slurry drilled pile stake side pressure sizing device A type, form by precast reinforced cage 1, mud jacking steel conduit 2, it is characterized in that: mud jacking steel conduit 2 vertically is arranged in the precast reinforced cage 1, arrange two to four along stake week, the stake top is stretched out in the upper end, and the lower end is provided with the back taper slip casting interface 9 that stretches out to both sides of inverted T-shape; Be arranged circumferentially PVC reinforcement elastic hose 3 in the precast reinforced cage outside, flexible pipe is petal super stake footpath symmetry and protrudes, protrude the position mud jacking one way valve 4 is set, with precast reinforced cage contact position, peg graft with the back taper interface 9 of mud jacking steel conduit lower end and connect in PVC flexible pipe two ends, form closed circuit, fixed by the finer wire colligation, every steel conduit can connect the PVC reinforcement flexible pipe of one～two mud jacking section.

By Fig. 5, Fig. 6 as seen, slurry drilled pile stake side pressure sizing device Type B in the bottom of slurry pressuring tube 2, connects the PVC reinforcement flexible pipe 3 of setting in wave shape longitudinally, the trough of flexible pipe is fixed with finer wire and precast reinforced cage colligation, and the crest place of flexible pipe is provided with mud jacking one way valve 4.

As seen from Figure 4, described mud jacking one way valve is the plasma discharge hole 5 that is arranged circumferentially one to two row on PVC reinforcement flexible pipe 3, and inverted drawing pin or steel ball 6, outer coated adhesive tape 8 and rubber pneumatic tyre 7 are placed by the place in the plasma discharge hole.

Claims

1, a kind of slurry drilled pile stake side pressure sizing device, form by precast reinforced cage, mud jacking steel conduit, one way valve, it is characterized in that: the mud jacking steel conduit vertically is arranged in the precast reinforced cage, arrange two to four along stake week, the stake top is stretched out in the upper end, the lower end connects PVC reinforcement elastic hose, is provided with the mud jacking one way valve on flexible pipe.

2, slurry drilled pile stake side pressure sizing device as claimed in claim 1, it is characterized in that: described mud jacking steel conduit lower end is provided with the back taper slip casting interface that stretches out to both sides of inverted T-shape, PVC reinforcement elastic hose is pegged graft with the back taper interface of mud jacking steel conduit lower end and is connected, form closed circuit, hose loop is to being arranged on the precast reinforced cage outside, be petal super stake footpath symmetry and protrude, protrude the position mud jacking one way valve is set.

3, slurry drilled pile stake side pressure sizing device as claimed in claim 2 is characterized in that: the described PVC reinforcement elastic hose that is arranged circumferentially in the precast reinforced cage outside can be along multibreak setting of reinforcing cage.

4, slurry drilled pile stake side pressure sizing device as claimed in claim 1, it is characterized in that: described mud jacking one way valve is the plasma discharge hole that is arranged circumferentially 1-2 row on PVC reinforcement flexible pipe, inverted drawing pin or steel ball, outer coated high pressure adhesive waterproof tape and rubber pneumatic tyre are placed by the place in the plasma discharge hole.

5, slurry drilled pile stake side pressure sizing device as claimed in claim 1, it is characterized in that: in the bottom of described mud jacking steel conduit, connect and be the PVC reinforcement flexible pipe that vertical waveform is provided with, the trough of flexible pipe is fixed by finer wire and precast reinforced cage colligation, and the crest place of flexible pipe is provided with the mud jacking one way valve.