CN115110516B - Super-long cast-in-place pile side high polymer sectional type post grouting construction system and method - Google Patents
Super-long cast-in-place pile side high polymer sectional type post grouting construction system and method Download PDFInfo
- Publication number
- CN115110516B CN115110516B CN202210829541.XA CN202210829541A CN115110516B CN 115110516 B CN115110516 B CN 115110516B CN 202210829541 A CN202210829541 A CN 202210829541A CN 115110516 B CN115110516 B CN 115110516B
- Authority
- CN
- China
- Prior art keywords
- grouting
- pipe
- air bag
- high polymer
- sealing air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229920000642 polymer Polymers 0.000 title claims abstract description 81
- 238000010276 construction Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 10
- 238000007789 sealing Methods 0.000 claims abstract description 98
- 230000002787 reinforcement Effects 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 44
- 239000002002 slurry Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000005086 pumping Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000007569 slipcasting Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The application belongs to the technical field of pile foundation reinforcement construction. The utility model discloses a super long bored concrete pile side polymer sectional type post-grouting construction system, including sectional type grouting pipe, slip casting pipe and play thick liquid pipe, a plurality of stake side pressure thick liquid heads have been set up to the interval in the length direction of each sectional type grouting pipe, be provided with one-way end thick liquid unit on the stake side pressure thick liquid head; the upper sealing air bag and the lower sealing air bag are arranged in the sectional grouting pipe in an up-down opposite mode, an air pipe is connected between the upper sealing air bag and the lower sealing air bag, an air suction hole corresponding to the upper sealing air bag and the lower sealing air bag is formed in the air pipe, and an air pump is arranged at the outer end portion of the air pipe. Also discloses a sectional post-grouting construction method for the super-long cast-in-place pile side high polymer. The application can perform sectional post-pressure grouting, thereby realizing the grouting operation of the high polymer on the pile side of the ultra-long cast-in-place pile and solving the problems that the traditional grouting technology cannot perform ultra-long grouting, the traditional cement grouting maintenance time is long, the early strength is low and the like.
Description
Technical Field
The invention belongs to the technical field of pile foundation reinforcement construction, and particularly relates to a pile side high polymer sectional type post grouting construction system and method for an ultra-long cast-in-place pile.
Background
In recent years, along with the continuous development of foundation construction industry in China, river-crossing and sea-crossing bridges are more and more, particularly in soft soil areas such as sandy soil, soft clay, expansive soil and the like, the post-grouting technology for drilling cast-in-place piles is widely applied to the projects, the effect is remarkable in the aspect of pile foundation bearing capacity improvement, the construction design can be guided to a certain extent, the pile length is reduced, and the economic benefit is remarkable. However, with the release of the 'schema for construction of the traffic-strengthening country' in China, a batch of heavy traffic construction projects are developed in China. The Henan province promotes the construction of the traffic strong province, promotes the high-quality development of the yellow river basin, and promotes the special project of '13445 engineering', namely, by the end of 2025 years, the expressway driving mileage of the whole province reaches more than 10000 km, the newly increased driving mileage reaches more than 3000 km, the investment is more than 4000 hundred million yuan, and the driving mileage is strived for to be in the 4 th position of the whole country and the road network density is in the 5 th position of the whole country. The An Luogao Zhengzhou to Yuan Yang section yellow river super-large bridge project is a key project in 13445 project, and is also a two-way 8-lane river-crossing large bridge on the yellow river. Because yellow sand is deposited on the yellow river for a long time, the riverbed is covered with an ultra-thick sand layer, the bearing layer is deeper, and a large-diameter ultra-long filling pile is generally used as a bridge abutment foundation. Due to the particularity of sand, the sand around the pile can be liquefied under the circulation of traffic load vibration, water flow and wind load, so that the pile body can be unevenly settled, and the safe operation of the bridge is seriously affected. For this reason, the post-grouting technology with ultra-long and large diameter is adopted, the pile length is designed to be 80-110 m, and the pile diameter is set to be 2.2m.
The post-grouting technology of pile bodies starts in the 60 th century and refers to a construction technology for injecting modified slurry (usually cement slurry) into a rock-soil body at a pile end (pile side) through a grouting pipe pre-buried in the pile body by grouting equipment. The technology can effectively improve the inherent defects of pile bottom sediment, pile side mud skin and the like of the bored pile, and greatly improve the bearing capacity of the bored pile with relatively low cost. The traditional grouting slurry is mainly cement slurry, but the production of cement can cause environmental pollution, and the common cement slurry has the problems of slow setting time, poor cementing capacity with soil, weak impermeability, insufficient durability and the like, and does not meet the requirements of ecological protection and high-quality development of yellow river basin. With the continuous development of chemical grouting materials, the high polymer grouting materials have the advantages of short setting time, low viscosity, good durability, environmental protection, no need of maintenance, high early strength and excellent performance of shock absorption and vibration isolation, and are widely applied to the fields of embankment reinforcement, roadbed reinforcement, high-speed rail plate lifting, drainage pipeline repair and the like. The construction method suitable for post-grouting of the large-diameter ultra-long cast-in-place pile is continuously developed, and particularly, the construction method for post-grouting of the ultra-long cast-in-place pile side high polymer in a sectional mode is provided.
Before the invention, the inventor has disclosed a Chinese patent ' permeable cementing polyurethane grouting material ' (ZL 202010609031.2) for soil body seepage prevention and reinforcement ', the polymer material not only has better permeability, micro-expansion when meeting water and controllable setting time in soil body, but also inherits the excellent performances of good durability, environmental protection, energy saving, high early strength, no need of maintenance, shock absorption and vibration isolation and the like of the traditional polymer material. The Chinese patent invention discloses a construction method of a high polymer material post-grouting expansion filling pile (ZL 201210082894.4), which is characterized in that a grouting cloth bag is arranged on a steel reinforcement cage, and then a non-water reaction type expansion high polymer material is injected to form an expansion supporting disc and a bottom expansion filling pile, so that the purpose of improving the bearing capacity is achieved, and the method has the characteristics of environmental protection and durability. However, the high polymer used in the method is an expansion type non-aqueous reaction high polymer, and the reaction rate of the material is too fast, and the reaction distance in a grouting pipe is about 10m, so that the method is only suitable for improving the bearing performance of the short piles. In addition, the method improves the bearing performance of the pile body by compaction and expansion, does not improve the prior defects of pile bottom sediment, pile side mud skin and the like of the bored pile, and does not utilize the timeliness improvement of the bearing performance of the bored pile. The invention discloses a marine steel pipe pile distributed post-grouting device, a pneumatic grouting assembly and a construction method thereof (ZL 202010380772.8), which realize ultra-long pile distributed post-grouting, but cement is used as grouting material in the invention, and a grouting pipe is blocked by the permeable polymer material used in the invention when meeting water reaction, so that the grouting pipe cannot be reused, and ultra-long pile post-grouting cannot be realized.
Disclosure of Invention
The invention aims to solve the problems and the shortcomings, and provides a segmented post-grouting construction system and method for a high polymer on the pile side of an ultra-long cast-in-place pile, which can perform segmented post-grouting, thereby realizing the grouting operation of the high polymer on the pile side of the ultra-long cast-in-place pile and solving the problems that the traditional grouting technology cannot perform ultra-long grouting, the traditional cement grouting maintenance time is long, the early strength is low and the like.
In order to achieve the above purpose, the technical scheme adopted is as follows:
An ultra-long cast-in-place pile side high polymer sectional type post grouting construction system, comprising:
A plurality of sectional grouting pipes distributed on the circumference of the reinforcement cage of the pile body;
Pile side pressure slurry heads are arranged at intervals in the length direction of each sectional type slurry pressing pipe, the pile side pressure slurry heads are communicated with the sectional type slurry pressing pipes, a one-way slurry stopping unit is arranged on each pile side pressure slurry head, and the one-way slurry stopping unit is used for preventing external liquid from flowing into the sectional type slurry pressing pipes through the pile side pressure slurry heads;
An upper sealing air bag;
The upper sealing air bag and the lower sealing air bag are arranged in the sectional grouting pipe in an up-down opposite mode, a grouting cavity is formed among the upper sealing air bag, the lower sealing air bag and the inner wall of the sectional grouting pipe, an air pipe is connected between the upper sealing air bag and the lower sealing air bag, an air suction hole corresponding to the upper sealing air bag and the lower sealing air bag is formed in the air pipe, and an air pump is arranged at the outer end part of the air pipe;
The grouting device comprises a grouting pipe, wherein a first three-way valve is arranged at the outer end part of the grouting pipe, a second port of the first three-way valve is connected with a grouting unit, and a third port of the first three-way valve is an emptying port; the inner end part of the grouting pipe is communicated with the grouting cavity; and
The outer end part of the pulp outlet pipe is provided with a second three-way valve, a second port of the second three-way valve is connected with a pump, and a third port of the second three-way valve is an emptying port; the inner end part of the grouting pipe is communicated with the grouting cavity;
the distance between the upper sealing air bag and the lower sealing air bag is smaller than or equal to the distance between two adjacent pile side pressure slurry heads.
According to the ultra-long cast-in-place pile side high polymer sectional post-grouting construction system, preferably, the one-way grouting stopping unit is a one-way valve arranged in the pile side grouting head.
According to the ultra-long cast-in-place pile side high polymer sectional post-grouting construction system, preferably, the unidirectional grouting stop unit comprises a conical grouting stop arranged at the end part of the pile side grouting head and a tension spring arranged between the grouting stop and the sectional grouting pipe.
According to the super-long cast-in-place pile side high polymer sectional type post grouting construction system, preferably, the bottom of the lower sealing air bag is provided with a balancing weight.
According to the segmented post-grouting construction system for the super-long cast-in-place pile side high polymer, preferably, the grouting unit comprises a storage box, a grouting machine and a grouting gun which are sequentially arranged, the grouting machine is connected with the grouting gun through a lifting pipe, and the discharge end of the grouting gun is connected with the second port of the first three-way valve.
According to the super-long cast-in-place pile side high polymer sectional type post grouting construction system, preferably, 2-5 sectional grouting pipes are circumferentially arranged on the reinforcement cage, and at least one sectional grouting pipe is a supplementary grouting pipe.
According to the super-long cast-in-place pile side polymer sectional type post grouting construction system, preferably, the grouting pipe and the grouting pipe are transparent hoses, filter screens are arranged at the bottoms of the grouting pipe and the grouting pipe, the grout stop plug, the upper sealing air bag and the lower sealing air bag are made of rubber materials, the air pipe is a transparent hose, the upper sealing air bag and the lower sealing air bag are fixedly connected with the air pipe, the length of the air pipe between the upper sealing air bag and the lower sealing air bag is smaller than or equal to the distance between two adjacent pile side pressure grouting heads, and scale marks are arranged on the air pipe.
The sectional post-grouting construction method for the super-long cast-in-place pile side high polymer is used for injecting high polymer to the periphery of pile body concrete in a pressing mode, and the sectional post-grouting construction system for the super-long cast-in-place pile side high polymer is used for carrying out sectional post-grouting construction and comprises the following steps of:
a. After the initial setting of the poured pile body concrete is finished, assembling the super-long cast-in-place pile side high polymer sectional type post grouting construction system;
b. placing an upper sealing air bag and a lower sealing air bag into the sectional grouting pipe, enabling the grouting cavity to correspond to a pile side grouting head at the lowest end of the sectional grouting pipe, and inflating the upper sealing air bag and the lower sealing air bag;
c. firstly, evacuating liquid in a grouting cavity through a pump, then injecting a water-proof material which does not react with water and high polymer into the grouting cavity through a grouting unit, and finally evacuating the water-proof material in the grouting cavity through the pump, so as to complete the first hole washing operation;
d. Starting a grouting unit to perform high polymer grouting to the circumferential direction of the pile body through a grouting cavity and a pile side grouting head until the set grouting parameters are reached, and stopping grouting;
e. firstly, evacuating the high polymer in the grouting cavity through a pump, then injecting the water-proof material which does not react with water and the high polymer into the grouting cavity through a grouting unit, and finally evacuating the water-proof material in the grouting cavity through the pump, so as to finish the second hole washing operation;
f. Repeating the steps b-e, and performing high polymer grouting operation on the same layer position of other segmented grouting pipes;
g. And lifting the upper sealing air bag and the lower sealing air bag, so that the grouting cavity corresponds to the pile side grouting head of the upper layer, repeating the construction steps, and sequentially completing the high polymer grouting operation of each layer of the segmented grouting pipe.
According to the sectional post-grouting construction method for the super-long cast-in-place pile side high polymer, in the step c, preferably, a first three-way valve is controlled to be communicated with a grouting pipe and an emptying port, a second three-way valve is controlled to be communicated with a grouting pipe and a pumping pump, the pumping pump is started to pump water to a grouting cavity, and the operation is stopped until no water exists; controlling the first three-way valve to conduct the grouting pipe and the grouting unit, controlling the second three-way valve to conduct the grouting pipe and the emptying port, and starting the grouting unit to inject the water-proof material which does not react with water and high polymer into the grouting chamber until the grouting pipe is overflowed by the water-proof material; and controlling the first three-way valve to conduct the grouting pipe and the emptying port again, controlling the second three-way valve to conduct the grouting pipe and the pumping and discharging pump, starting the pumping and discharging pump to suck the grouting cavity, and stopping operation until no waterproof material is discharged.
According to the sectional post-grouting construction method for the super-long cast-in-place pile side high polymer, preferably, in the step e, a first three-way valve is controlled to be communicated with a grouting pipe and an emptying port, a second three-way valve is controlled to be communicated with a grouting pipe and a pumping and draining pump, and the pumping and draining pump is started to pump a grouting cavity until the grouting pipe is free from high polymer discharge; controlling the first three-way valve to conduct the grouting pipe and the grouting unit, controlling the second three-way valve to conduct the grouting pipe and the emptying port, and starting the grouting unit to inject the water-proof material which does not react with water and high polymer into the grouting chamber until the grouting pipe is overflowed by the water-proof material; and controlling the first three-way valve to conduct the grouting pipe and the emptying port again, controlling the second three-way valve to conduct the grouting pipe and the pumping and discharging pump, starting the pumping and discharging pump to suck the grouting cavity, and stopping operation until no waterproof material is discharged.
By adopting the technical scheme, the beneficial effects are that:
The application solves the problems that the grouting pipe is blocked by the high polymer grouting material when meeting water reaction, so that the grouting pipe cannot be reused, the traditional high polymer grouting technology cannot perform ultra-long distance grouting, the traditional cement paste has poor long-term performance, and the health maintenance is required. The application can effectively utilize the high polymer grouting material to have the advantages of short setting time, low viscosity, good durability, environmental protection, shock absorption and vibration isolation, and is beneficial to the improvement of the long-term performance of the ultra-long cast-in-place pile. The construction system and the construction method are simple and easy to understand, high in operability, convenient for quality control, obvious in economic benefit, and capable of remarkably improving the bearing performance and ageing performance of the ultra-long cast-in-place pile.
The upper sealing air bag and the lower sealing air bag are arranged, so that a relatively sealed grouting cavity can be formed in the sectional grouting pipe, the subsequent sectional grouting operation is facilitated, and the sectional grouting of pile-side grouting heads of all layers can be effectively realized by controlling the distance between the upper sealing air bag and the lower sealing air bag; the grouting pipe and the grouting pipe can realize hole washing operation of the grouting chamber, thereby ensuring that high polymers do not react in the grouting chamber and being more beneficial to realizing sectional grouting construction of the ultra-long cast-in-place pile; the arrangement of the pile side pressure slurry head can realize unidirectional grouting, and a certain traction force can be provided for the slurry stop plug through the arrangement of the extension spring, so that the slurry from the pile side pressure slurry head can be prevented from flowing out in the grouting process of the waterproof material, and the hole washing is facilitated.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the following description will briefly explain the drawings of the embodiments of the present invention. Wherein the showings are for the purpose of illustrating some embodiments of the invention only and not for the purpose of limiting the same.
Fig. 1 is a schematic structural diagram of a sectional post-grouting construction system for a super-long cast-in-place pile side polymer according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a distribution structure of a sectional grouting pipe on a reinforcement cage according to an embodiment of the present invention.
Number in the figure:
Number in the figure:
1 is an upper sealing air bag, 2 is a lower sealing air bag, 3 is a slurry plug, 4 is a tension spring, 5 is a pile side pressure slurry head, 6 is a slurry outlet hole, 7 is a spring fixing screw, 8 is a filter screen, 9 is a grouting pipe, 10 is a gas pumping hole, 11 is a storage box, 12 is a grouting machine, 13 is a lifting pipe, 14 is a grouting gun, 15 is a gas pipe, 16 is a slurry outlet pipe, 17 is a first three-way valve, 18 is a second three-way valve, 19 is a pumping pump, 20 is a segmented grouting pipe, 21 is a balancing weight, 22 is a gas pump, 23 is a grouting chamber and 24 is a steel reinforcement cage.
Detailed Description
An exemplary embodiment of the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art.
In the description of the present invention, it should be understood that the expressions "first" and "second" are used to describe various elements of the present invention and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
It should be noted that when an element is referred to as being "connected," "coupled," or "connected" to another element, it can be directly connected, coupled, or connected, but it is understood that there may be intervening elements present therebetween; i.e. the positional relationship of direct connection and indirect connection is covered.
It should be noted that the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.
It should be noted that terms like "upper," "lower," "left," "right," and the like, which indicate an orientation or a positional relationship, are merely used to indicate a relative positional relationship, and are provided for convenience in describing the present invention, and do not necessarily refer to devices or elements having a particular orientation, being constructed and operated in a particular orientation; when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
Referring to fig. 1 and 2, an ultra-long cast-in-place pile side polymer sectional type post-grouting construction system comprises a plurality of sectional grouting pipes 20, pile side grouting heads 5, an upper sealing air bag 1, a lower sealing air bag 2, grouting pipes 9 and grouting pipes 16 which are distributed on the periphery of a reinforcement cage 24 of a pile body, wherein the number of the sectional grouting pipes 20 which are circumferentially arranged on the reinforcement cage 24 of the embodiment can be increased or decreased according to the diameter of a cast-in-place pile, at least one sectional grouting pipe 20 is reserved as a supplementary grouting pipe, and preferably, four sectional grouting pipes 20 are circumferentially arranged on the reinforcement cage. When the bored pile is constructed, the bored pile is drilled firstly, a steel reinforcement cage with four sectional grouting pipes 20 symmetrically arranged around is put down, concrete is poured, initial setting is completed, and the sectional grouting pipes and the bored pile form an integrated structure.
A plurality of pile side pressure slurry heads 5 are arranged at intervals in the length direction of each sectional grouting pipe 20, the positions of the pile side pressure slurry heads are designed according to the length of a cast-in-place pile and the distance of sectional grouting, the pile side pressure slurry heads 5 are communicated with the sectional grouting pipes 20, a one-way slurry stopping unit is arranged on each pile side pressure slurry head 5 and used for preventing external liquid from flowing into the sectional grouting pipes 20 through the pile side pressure slurry heads 5; the one-way stop unit of the present embodiment is a one-way valve provided in the pile-side pressing head, and preferably includes a tapered stop plug 3 provided at an end of the pile-side pressing head 5 and an extension spring 4 provided between the stop plug 3 and the segmented pressing pipe 20. Specifically, pile side pressure thick liquid head 5 seamless welding is in sectional type mud jacking pipe 20 one side, is provided with the stop cock 3 of extension spring 4 control in the pile side pressure thick liquid head 5, prevents that water from getting into sectional type mud jacking pipe 20, and extension spring 4 passes through spring set screw 7 to be fixed on sectional type mud jacking pipe 20, and is provided with the play thick liquid hole 6 that corresponds with pile side pressure thick liquid head on the sectional type mud jacking pipe 20.
The upper sealing air bag 1 and the lower sealing air bag 2 are arranged in the sectional grouting pipe 20 vertically oppositely, a grouting chamber 23 is formed among the upper sealing air bag 1, the lower sealing air bag 2 and the inner wall of the sectional grouting pipe 20, an air pipe 15 is connected between the upper sealing air bag 1 and the lower sealing air bag 2, an air exhaust hole 10 corresponding to the upper sealing air bag 1 and the lower sealing air bag 2 is formed in the air pipe 15, the lower end of the air pipe is open and is positioned in the lower sealing air bag, therefore, the air exhaust hole corresponding to the lower sealing air bag is not required to be arranged on the side wall of the air pipe, an air pump 22 is arranged at the outer end part of the air pipe 15, the upper sealing air bag and the lower sealing air bag can be inflated through the air pump, and an air release valve is further arranged for deflating the upper sealing air bag and the lower sealing air bag. In this embodiment, the grout stop plug 3, the upper sealing air bag 1 and the lower sealing air bag 2 are made of rubber, the air pipe 15 is a transparent hose, the upper sealing air bag 1 and the lower sealing air bag 2 are fixedly connected with the air pipe 15, the length of the air pipe between the upper sealing air bag 1 and the lower sealing air bag 2 is less than or equal to the distance between two adjacent piles of lateral grouting heads 5, and scale marks are arranged on the air pipe 15. The bottom of the lower sealing airbag 2 is provided with the balancing weight 21, so that the sealing airbag is positioned conveniently, the air pipe is in an effective stretching state, and the positions of the upper sealing airbag and the lower sealing airbag are controlled accurately according to the scale marks on the air pipe. In order to avoid that the air pipe, the grouting pipe and the grouting pipe directly pull the upper sealing air bag and the lower sealing air bag, an effective winding and tensile winding and unwinding wire can be additionally arranged, the winding and unwinding wire plays a supporting role on the upper sealing air bag, the lower sealing air bag and the balancing weight, and the air pipe, the grouting pipe and the grouting pipe synchronously lift along with the winding and unwinding wire.
The outer end part of the grouting pipe 9 is provided with a first three-way valve 17, a second port of the first three-way valve 17 is connected with a grouting unit, a third port of the first three-way valve 17 is an emptying port, and the inner end part of the grouting pipe 9 is communicated with a grouting chamber 23; the outer end part of the pulp outlet pipe 16 is provided with a second three-way valve 18, a second port of the second three-way valve 18 is connected with a pump 19, and a third port of the second three-way valve 18 is an emptying port; the inner end of the discharge pipe 16 communicates with the grouting chamber 23.
The grouting unit in the structure comprises a storage box 11, a grouting machine 12 and a grouting gun 14 which are sequentially arranged, wherein the grouting machine is connected with the grouting gun through a lifting pipe 13, and the discharge end of the grouting gun 14 is connected with the second port of the first three-way valve 17. Since grouting of two substances of the high polymer and the water-proof material is required, two sets of grouting units or two storage tanks may be provided for grouting of different substances at different times.
Further, the sectional grouting pipe 20 in the application is a stainless steel pipe with an inner diameter of 60mm and a wall thickness of 5 mm; the pile side pressure slurry head 5 is a stainless steel pipe with the length of 100mm, the inner diameter of 30mm and the wall thickness of 5 mm; the air pipe 15 is a high-pressure-resistant transparent hose with the inner diameter of 8mm and the wall thickness of 2mm and scales; the grouting pipe 9 and the grouting pipe 16 are high-pressure-resistant transparent hoses with the inner diameter of 12mm and the wall thickness of 2mm, and the filter screen 8 is arranged at the bottom of the hose to prevent impurities in a grouting cavity between the upper sealing air bag 1 and the lower sealing air bag 2 from blocking the grouting pipe 9 and the grouting pipe 16.
The application also discloses a sectional post-grouting construction method for the super-long cast-in-place pile side high polymer, which is used for injecting the high polymer into the periphery of pile body concrete in a pressing way, wherein the high polymer in the embodiment is a permeable high polymer grouting material, and the sectional post-grouting construction method is carried out by utilizing the sectional post-grouting construction system for the super-long cast-in-place pile side high polymer, and specifically comprises the following steps:
a. After the initial setting of the poured pile body concrete is finished, assembling the super-long cast-in-place pile side high polymer sectional type post grouting construction system;
b. Placing the upper sealing airbag 1 and the lower sealing airbag 2 into the sectional grouting pipe 20, and enabling the grouting chamber 23 to correspond to the pile side grouting head 5 at the lowest end of the sectional grouting pipe 20, so as to inflate the upper sealing airbag 1 and the lower sealing airbag 2;
c. firstly, evacuating liquid in the grouting chamber 23 through the pump 19, then injecting water-proof material which does not react with water and high polymer into the grouting chamber 23 through the grouting unit, and finally evacuating the water-proof material in the grouting chamber 23 through the pump 19 to finish the first hole washing operation;
The specific operation steps are as follows: controlling the first three-way valve 17 to conduct the grouting pipe and the emptying port, controlling the second three-way valve 18 to conduct the grouting pipe 16 and the pump 19, starting the pump 19 to pump water to the grouting chamber 23, and stopping the operation until no water exists; controlling the first three-way valve 17 to conduct the grouting pipe 9 and the grouting unit, controlling the second three-way valve 18 to conduct the grouting pipe 16 and the emptying port, and starting the grouting unit to inject the water-proof material which does not react with water and high polymer into the grouting chamber 23 until the grouting pipe 16 is overflowed with the water-proof material; controlling the first three-way valve 17 to conduct the grouting pipe and the emptying port again, controlling the second three-way valve 18 to conduct the grouting pipe 16 and the pump 19, starting the pump 19 to suck the grouting chamber 23, and stopping the operation until no waterproof material is discharged;
d. the grouting unit is started to perform high polymer grouting to the circumferential direction of the pile body through the grouting chamber 23 and the pile side pressure grouting head 5 until the preset grouting parameters are reached, and grouting is stopped, and the grouting unit can control according to the preset grouting pressure or grouting amount;
e. Firstly, evacuating the high polymer in the grouting chamber 23 through the pump 19, then injecting the water-proof material which does not react with water and the high polymer into the grouting chamber 23 through the grouting unit, and finally evacuating the water-proof material in the grouting chamber 23 through the pump 19 to finish the second hole washing operation;
The specific operation steps are as follows: controlling the first three-way valve 17 to conduct the grouting pipe 9 and the emptying port, controlling the second three-way valve 18 to conduct the grouting pipe 16 and the pump 19, and starting the pump 19 to suck the grouting cavity 23 until the grouting pipe 16 has no high polymer discharge; controlling the first three-way valve 17 to conduct the grouting pipe 9 and the grouting unit, controlling the second three-way valve 18 to conduct the grouting pipe 16 and the emptying port, and starting the grouting unit to inject the water-proof material which does not react with water and high polymer into the grouting chamber 23 until the grouting pipe 16 is overflowed with the water-proof material; controlling the first three-way valve 17 to conduct the grouting pipe 9 and the emptying port again, controlling the second three-way valve 18 to conduct the grouting pipe 16 and the pump 19, starting the pump 19 to suck the grouting chamber 23, and stopping the operation until no water-proof material is discharged;
f. Repeating the steps b-e, and performing high polymer grouting operation on the same layer position of the other segmented grouting pipes 20;
g. The upper sealing air bag 1 and the lower sealing air bag 2 are lifted, so that the grouting chamber 23 corresponds to the pile side grouting head 5 of the upper layer, the construction steps are repeated, and the high polymer grouting operation of each layer of the sectional grouting pipe is sequentially completed.
The application solves the problems that the grouting pipe is blocked by the high polymer grouting material when meeting water reaction, so that the grouting pipe cannot be reused, the traditional high polymer grouting technology cannot perform ultra-long distance grouting, the traditional cement paste has poor long-term performance, and the health maintenance is required. The application can effectively utilize the high polymer grouting material to have the advantages of short setting time, low viscosity, good durability, environmental protection, high early strength, excellent performance of shock absorption and vibration isolation, and is beneficial to the improvement of the long-term performance of the bearing capacity of the ultra-long cast-in-place pile. The construction system and the construction method are simple and easy to understand, high in operability, convenient for quality control, obvious in economic benefit, and capable of remarkably improving the bearing performance and ageing performance of the ultra-long cast-in-place pile.
Preferred embodiments for carrying out the invention have been described in detail hereinabove, but it should be understood that these embodiments are merely illustrative and are not intended to limit the scope, applicability or configuration of the invention in any way. The scope of the invention is defined by the appended claims and equivalents thereof. Many modifications and variations of the foregoing embodiments will be apparent to those of ordinary skill in the art in light of the teachings of this invention, which will fall within the scope of this invention.
Claims (9)
1. The sectional post-grouting construction method for the super-long cast-in-place pile side high polymer is used for injecting the high polymer to the periphery of pile body concrete in a pressing mode and is characterized by utilizing a sectional post-grouting construction system for the super-long cast-in-place pile side high polymer to perform sectional post-grouting construction and specifically comprises the following steps of:
a. After the initial setting of the poured pile body concrete is finished, assembling the super-long cast-in-place pile side high polymer sectional type post grouting construction system;
b. placing an upper sealing air bag and a lower sealing air bag into the sectional grouting pipe, enabling the grouting cavity to correspond to a pile side grouting head at the lowest end of the sectional grouting pipe, and inflating the upper sealing air bag and the lower sealing air bag;
c. firstly, evacuating liquid in a grouting cavity through a pump, then injecting a water-proof material which does not react with water and high polymer into the grouting cavity through a grouting unit, and finally evacuating the water-proof material in the grouting cavity through the pump, so as to complete the first hole washing operation;
d. Starting a grouting unit to perform high polymer grouting to the circumferential direction of the pile body through a grouting cavity and a pile side grouting head until the set grouting parameters are reached, and stopping grouting;
e. firstly, evacuating the high polymer in the grouting cavity through a pump, then injecting the water-proof material which does not react with water and the high polymer into the grouting cavity through a grouting unit, and finally evacuating the water-proof material in the grouting cavity through the pump, so as to finish the second hole washing operation;
f. Repeating the steps b-e, and performing high polymer grouting operation on the same layer position of other segmented grouting pipes;
g. Lifting the upper sealing air bag and the lower sealing air bag to enable the grouting cavity to correspond to the pile side grouting head of the upper layer, repeating the construction steps d-f, and sequentially completing high polymer grouting operation of each layer of the segmented grouting pipe;
The super-long cast-in-place pile side high polymer sectional type post grouting construction system comprises:
A plurality of sectional grouting pipes distributed on the circumference of the reinforcement cage of the pile body;
Pile side pressure slurry heads are arranged at intervals in the length direction of each sectional type slurry pressing pipe, the pile side pressure slurry heads are communicated with the sectional type slurry pressing pipes, a one-way slurry stopping unit is arranged on each pile side pressure slurry head, and the one-way slurry stopping unit is used for preventing external liquid from flowing into the sectional type slurry pressing pipes through the pile side pressure slurry heads;
An upper sealing air bag;
The upper sealing air bag and the lower sealing air bag are arranged in the sectional grouting pipe in an up-down opposite mode, a grouting cavity is formed among the upper sealing air bag, the lower sealing air bag and the inner wall of the sectional grouting pipe, an air pipe is connected between the upper sealing air bag and the lower sealing air bag, an air suction hole corresponding to the upper sealing air bag and the lower sealing air bag is formed in the air pipe, and an air pump is arranged at the outer end part of the air pipe;
The grouting device comprises a grouting pipe, wherein a first three-way valve is arranged at the outer end part of the grouting pipe, a second port of the first three-way valve is connected with a grouting unit, and a third port of the first three-way valve is an emptying port; the inner end part of the grouting pipe is communicated with the grouting cavity; and
The outer end part of the pulp outlet pipe is provided with a second three-way valve, a second port of the second three-way valve is connected with a pump, and a third port of the second three-way valve is an emptying port; the inner end part of the grouting pipe is communicated with the grouting cavity;
the distance between the upper sealing air bag and the lower sealing air bag is smaller than or equal to the distance between two adjacent pile side pressure slurry heads.
2. The segmented post-grouting construction method for the super-long cast-in-place pile side high polymer according to claim 1, wherein in the step c, a first three-way valve is controlled to be communicated with a grouting pipe and an emptying port, a second three-way valve is controlled to be communicated with a grouting pipe and a pumping pump, the pumping pump is started to pump water from a grouting cavity until no water exists, and then the operation is stopped; controlling the first three-way valve to conduct the grouting pipe and the grouting unit, controlling the second three-way valve to conduct the grouting pipe and the emptying port, and starting the grouting unit to inject the water-proof material which does not react with water and high polymer into the grouting chamber until the grouting pipe is overflowed by the water-proof material; and controlling the first three-way valve to conduct the grouting pipe and the emptying port again, controlling the second three-way valve to conduct the grouting pipe and the pumping and discharging pump, starting the pumping and discharging pump to suck the grouting cavity, and stopping operation until no waterproof material is discharged.
3. The segmented post-grouting construction method for the super-long cast-in-place pile side high polymer according to claim 1, wherein in the step e, a first three-way valve is controlled to be communicated with a grouting pipe and an emptying port, a second three-way valve is controlled to be communicated with a grouting pipe and a pumping pump, and the pumping pump is started to pump a grouting cavity until the grouting pipe is free of high polymer discharge; controlling the first three-way valve to conduct the grouting pipe and the grouting unit, controlling the second three-way valve to conduct the grouting pipe and the emptying port, and starting the grouting unit to inject the water-proof material which does not react with water and high polymer into the grouting chamber until the grouting pipe is overflowed by the water-proof material; and controlling the first three-way valve to conduct the grouting pipe and the emptying port again, controlling the second three-way valve to conduct the grouting pipe and the pumping and discharging pump, starting the pumping and discharging pump to suck the grouting cavity, and stopping operation until no waterproof material is discharged.
4. The segmented post-grouting construction method for the super-long cast-in-place pile side high polymer according to claim 1, wherein the one-way grouting unit is a one-way valve arranged in the pile side grouting head.
5. A method of sectional post-grouting construction for ultra-long cast-in-place pile side polymer according to claim 1 or 4, wherein the unidirectional grouting unit comprises a conical grouting stopper provided at an end of the pile side grouting head and a tension spring provided between the grouting stopper and the sectional grouting pipe.
6. The segmented post-grouting construction method for the super-long cast-in-place pile side high polymer according to claim 1, wherein a balancing weight is arranged at the bottom of the lower sealing air bag.
7. The segmented post-grouting construction method for the super-long cast-in-place pile side high polymer according to claim 1, wherein the grouting unit comprises a storage box, a grouting machine and a grouting gun which are sequentially arranged, the grouting machine is connected with the grouting gun through a lifting pipe, and the discharge end of the grouting gun is connected with the second port of the first three-way valve.
8. The segmented post-grouting construction method for the super-long cast-in-place pile side high polymer according to claim 1, wherein 2-5 segmented grouting pipes are arranged in the circumferential direction of the reinforcement cage, and at least one segmented grouting pipe is a supplementary grouting pipe.
9. The segmented post grouting construction method for the super-long cast-in-place pile side high polymer according to claim 5, wherein the grouting pipe and the grouting pipe are transparent hoses, filter screens are arranged at the bottoms of the grouting pipe and the grouting pipe, the grout stop plug, the upper sealing air bag and the lower sealing air bag are made of rubber materials, the air pipe is a transparent hose, the upper sealing air bag and the lower sealing air bag are fixedly connected with the air pipe, the length of the air pipe between the upper sealing air bag and the lower sealing air bag is smaller than or equal to the distance between two adjacent pile side pressure grouting heads, and scale marks are arranged on the air pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210829541.XA CN115110516B (en) | 2022-07-15 | 2022-07-15 | Super-long cast-in-place pile side high polymer sectional type post grouting construction system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210829541.XA CN115110516B (en) | 2022-07-15 | 2022-07-15 | Super-long cast-in-place pile side high polymer sectional type post grouting construction system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115110516A CN115110516A (en) | 2022-09-27 |
| CN115110516B true CN115110516B (en) | 2024-05-28 |
Family
ID=83332615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210829541.XA Active CN115110516B (en) | 2022-07-15 | 2022-07-15 | Super-long cast-in-place pile side high polymer sectional type post grouting construction system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115110516B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200337877Y1 (en) * | 2003-09-24 | 2004-01-07 | 대원토질 주식회사 | Pressure-type grouting apparatus for reinforcing the ground |
| CN101270576A (en) * | 2008-03-25 | 2008-09-24 | 广厦建设集团有限责任公司 | Secondary segmenting slip casting method for miniature pile |
| CN102587358A (en) * | 2012-03-27 | 2012-07-18 | 河海大学 | Technology of high polymer material post-grouting squeezed cast-in-place pile |
| CN102587361A (en) * | 2012-03-27 | 2012-07-18 | 河海大学 | Polymer material grouted wedge precast pile technique |
| CN102767173A (en) * | 2012-07-09 | 2012-11-07 | 河海大学 | High polymer material slurry filled discrete material pile composite foundation and construction method thereof |
| CN204435386U (en) * | 2015-04-17 | 2015-07-01 | 辽宁有色勘察研究院 | Cavitation district consolidation slip casting loading system |
| CN105220687A (en) * | 2014-06-30 | 2016-01-06 | 中国一冶集团有限公司 | Prestressed concrete pipe pile grouting behind shaft or drift lining method fills with core reinforcing construction method |
| CN205839760U (en) * | 2016-05-31 | 2016-12-28 | 深圳宏业基岩土科技股份有限公司 | Post-grouting device and the pile frame structure of cast-in-situ bored pile for cast-in-situ bored pile |
| JP2019100088A (en) * | 2017-12-04 | 2019-06-24 | 東亜建設工業株式会社 | Pile head isolation structure and construction method thereof |
| CN110438985A (en) * | 2019-07-26 | 2019-11-12 | 湖南化工地质工程勘察院有限责任公司 | Cast-in-situ bored pile pile foundation supporting course reinforcing construction method |
| CN110984137A (en) * | 2019-11-21 | 2020-04-10 | 四川宝鑫建设有限公司 | Bridge cast-in-situ bored pile construction method |
| CN112376571A (en) * | 2020-11-23 | 2021-02-19 | 中建一局集团建设发展有限公司 | Pile side and pile end integrated grouting device and construction method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469050A (en) * | 2018-12-25 | 2019-03-15 | 高永光 | Grout pile bottom is installed by hollow (hole) doughnut-shaped steel plate capsule (chamber) Post Grouting Technique |
-
2022
- 2022-07-15 CN CN202210829541.XA patent/CN115110516B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200337877Y1 (en) * | 2003-09-24 | 2004-01-07 | 대원토질 주식회사 | Pressure-type grouting apparatus for reinforcing the ground |
| CN101270576A (en) * | 2008-03-25 | 2008-09-24 | 广厦建设集团有限责任公司 | Secondary segmenting slip casting method for miniature pile |
| CN102587358A (en) * | 2012-03-27 | 2012-07-18 | 河海大学 | Technology of high polymer material post-grouting squeezed cast-in-place pile |
| CN102587361A (en) * | 2012-03-27 | 2012-07-18 | 河海大学 | Polymer material grouted wedge precast pile technique |
| CN102767173A (en) * | 2012-07-09 | 2012-11-07 | 河海大学 | High polymer material slurry filled discrete material pile composite foundation and construction method thereof |
| CN105220687A (en) * | 2014-06-30 | 2016-01-06 | 中国一冶集团有限公司 | Prestressed concrete pipe pile grouting behind shaft or drift lining method fills with core reinforcing construction method |
| CN204435386U (en) * | 2015-04-17 | 2015-07-01 | 辽宁有色勘察研究院 | Cavitation district consolidation slip casting loading system |
| CN205839760U (en) * | 2016-05-31 | 2016-12-28 | 深圳宏业基岩土科技股份有限公司 | Post-grouting device and the pile frame structure of cast-in-situ bored pile for cast-in-situ bored pile |
| JP2019100088A (en) * | 2017-12-04 | 2019-06-24 | 東亜建設工業株式会社 | Pile head isolation structure and construction method thereof |
| CN110438985A (en) * | 2019-07-26 | 2019-11-12 | 湖南化工地质工程勘察院有限责任公司 | Cast-in-situ bored pile pile foundation supporting course reinforcing construction method |
| CN110984137A (en) * | 2019-11-21 | 2020-04-10 | 四川宝鑫建设有限公司 | Bridge cast-in-situ bored pile construction method |
| CN112376571A (en) * | 2020-11-23 | 2021-02-19 | 中建一局集团建设发展有限公司 | Pile side and pile end integrated grouting device and construction method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115110516A (en) | 2022-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104131556B (en) | The construction method of the mutual foundation drainage pile for prestressed pipe of a kind of soft or hard interlayer | |
| CN104594348A (en) | Expanded head capsule type anchor rod and construction method thereof | |
| CN216108436U (en) | Circulation adds pressure release precipitation system and ground treatment system thereof | |
| CN110130936B (en) | Construction method for sudden encountering untreated karst cave or crack in shield tunneling process | |
| CN104372795A (en) | Device for eliminating pile foundation negative frictional resistance of soft soil foundation and construction method | |
| CN204000851U (en) | The stake of a kind of outsourcing water permeability concrete reinforced pipe gravel slip-casting | |
| CN106013078B (en) | A kind of construction method of highly permeable stratum consolidation curtain structure | |
| CN112253162A (en) | Water-rich sand layer large-diameter jacking pipe group entrance and exit reinforcing structure and construction method | |
| CN114457790B (en) | Pile forming device and pile forming method for cast-in-place piles in karst areas | |
| CN204282354U (en) | A kind of device eliminating soft foundation pile foundation negative friction force | |
| CN115110516B (en) | Super-long cast-in-place pile side high polymer sectional type post grouting construction system and method | |
| CN113279388A (en) | Foundation treatment system adopting combination of cyclic pressurization, pressure relief and dewatering grouting and construction method thereof | |
| CN215105880U (en) | Concrete inverted well suitable for connecting new and old water supply and drainage pipelines | |
| CN113373962B (en) | Combined leakage stoppage construction method for deep foundation pit | |
| CN204000859U (en) | The mutual foundation drainage pile for prestressed pipe of a kind of soft or hard interlayer | |
| CN111809712A (en) | Non-excavation repairing device and repairing method for inspection well | |
| CN111794118A (en) | Construction method suitable for bridge pile foundation under loess fracture cave-in condition | |
| CN216999653U (en) | Novel gasbag formula segmentation slip casting device | |
| CN110438986A (en) | A kind of breakage of cast-in-place bored pile pile splicing structure and method | |
| CN116122260A (en) | Construction method for grouting sleeve valve pipe to strengthen foundation | |
| CN114232611B (en) | Filling device and filling method for karst cave in pile hole | |
| CN212478002U (en) | Non-excavation prosthetic devices of inspection shaft | |
| CN206110124U (en) | Bored concrete pile stake end post grouting device | |
| CN114370275A (en) | Bedrock bolting-grouting impervious supporting structure and construction method thereof | |
| CN205314085U (en) | A biliquid slip casting system that is used for cement and water glass solution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |