CN112609676A - HDPE (high-density polyethylene) film composite underground diaphragm wall structure and construction method - Google Patents
HDPE (high-density polyethylene) film composite underground diaphragm wall structure and construction method Download PDFInfo
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- CN112609676A CN112609676A CN202011485001.1A CN202011485001A CN112609676A CN 112609676 A CN112609676 A CN 112609676A CN 202011485001 A CN202011485001 A CN 202011485001A CN 112609676 A CN112609676 A CN 112609676A
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- 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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention provides a HDPE film composite underground continuous wall structure and a construction method thereof, belonging to the field of municipal and environmental engineering. The construction method comprises the steps of adopting HDPE membranes to be welded into membrane units corresponding to unit groove sections of the underground continuous wall through hot melting, assembling and fixing the membrane units through a mounting frame or along with a reinforcement cage, carrying out slotted hole construction excavation according to the concrete/reinforced concrete underground continuous wall process, replacing slurry and cleaning holes, arranging the membrane units downwards, then continuously completing the concrete/reinforced concrete underground continuous wall construction, and completing the compounding of the membrane units and the single side or both sides of the concrete underground continuous wall after concrete is hardened; corresponding membrane lap joint arrangement is carried out in the construction process according to different joint modes of the continuous wall. According to the invention, the contact of concrete/reinforced concrete with air, underground water, heavy chemical industry environment or other corrosive environment is physically separated, so that the seepage resistance, durability, reliability and engineering service life of the underground continuous wall as a permanent structure are improved.
Description
Technical Field
The invention belongs to the field of municipal and environmental engineering, and particularly relates to a HDPE film composite underground continuous wall structure and a construction method.
Background
The concrete underground continuous wall includes plastic or common concrete underground impervious continuous wall without reinforcing steel bars in the wall body and reinforced concrete continuous wall with reinforcing steel bar cage. The concrete underground diaphragm wall is widely used for seepage prevention and seepage control engineering in the building field as a seepage prevention function, and the reinforced concrete diaphragm wall is widely used for underground bearing, supporting, anti-impact, retaining wall and other stress structures in the building field.
In the prior art, when the underground diaphragm wall is applied to an underground structure in a heavy chemical industry environment with higher engineering life requirement, or stricter anti-seepage standard or strong corrosion to cement or steel bars, the anti-seepage property, the corrosion resistance and the durability still have limitations. For example, under the environmental conditions of underground facilities, foundation structures of port engineering and the like in the heavy chemical industry environment, urban subways and pipe galleries using underground continuous walls in large quantity, the underground continuous walls in the prior art cannot meet the requirements of leakage prevention, corrosion prevention and durability.
Disclosure of Invention
In view of the defects or shortcomings in the prior art, the invention aims to provide the HDPE film composite underground continuous wall structure and the construction method, wherein the HDPE films are arranged on one side or two sides of the underground continuous wall, and then concrete pouring is completed, so that the seepage-proofing and corrosion-resisting properties of the underground continuous wall are improved, and the integral service life of a building is prolonged; meanwhile, the construction process is simple, the operation is easy, and the method is also suitable for multi-stage continuous engineering.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a construction method of an HDPE film composite underground continuous wall structure, where the construction method includes the following steps:
step S1, HDPE diaphragm units matched with the groove sections of the diaphragm wall units and welding connecting devices or fixing belts are prepared according to the parameters of the underground diaphragm wall, and counterweight bodies are prepared;
step S2, carrying out slotted hole construction according to the concrete/reinforced concrete underground continuous wall process;
step S3, the processed diaphragm unit and the counterweight body are assembled and fixed on the device arranged below the diaphragm unit by using a welding connection device or a fixing band on the construction site;
step S4, after the underground continuous wall slot is excavated and the slurry is changed and the hole is cleaned, HDPE diaphragm units provided with counterweight bodies are arranged on one side or both sides of the underground continuous wall unit slot through the diaphragm unit lower arrangement device to be in place in the slot hole of the underground continuous wall;
step S5, hanging out the device under the membrane unit and hanging the membrane unit on the side of the slotted hole;
and step S6, continuing construction according to the concrete/reinforced concrete underground continuous wall process in the slotted hole in which the HDPE membrane unit is hung, and finishing the compounding of the HDPE membrane unit and the underground continuous wall on one side or two sides after the concrete is hardened.
As a preferred embodiment of the present invention, the construction method further includes:
and step S7, after the first-stage underground continuous wall unit is finished, when the second-stage underground continuous wall unit is constructed, the HDPE membrane units arranged below the first-stage underground continuous wall unit are arranged in a lap joint mode, and a complete composite underground continuous wall structure is formed after the first-stage and second-stage underground continuous walls are poured.
According to a preferred embodiment of the invention, the concrete underground continuous wall process adopts a joint mode for HDPE membrane units according to different lap joint modes, and comprises the following steps: a joint pipe mode, a butt joint mode, a joint plate mode of installing rubber water stop in the middle of a joint and an I-shaped steel joint mode.
In a preferred embodiment of the present invention, the joint pipe type, butt joint type and joint plate type are constructed as follows:
arranging a joint film section of the first-stage HDPE film unit at the end part of the concrete joint and extending towards the middle part of the slotted hole end, and welding a T-shaped lock made of HDPE on the joint film section; after the second-stage slotted hole is excavated and cleaned, a second-stage HDPE membrane unit is arranged below, at least one slow expansion type water stop strip is bonded at the head of a joint membrane section of the second-stage HDPE membrane unit, and a pre-embedded grouting floral tube is fixed at the tail of the joint membrane section; after the whole construction of the continuous wall is finished, the joint film section of the first-stage HDPE film unit is connected with the joint film section of the second-stage HDPE film unit, and grouting is carried out through a grouting perforated pipe so as to seal a potential permeation channel.
As a preferred embodiment of the present invention, when the coupling is performed in a coupling pipe manner, a butt-joint manner, and a joint plate manner, the diaphragm unit lower setting means employs a guide type mounting bracket or a roll type mounting bracket.
As a preferred embodiment of the present invention, the procedure of arranging the HDPE film units under the guide type mounting frame is as follows: will HDPE diaphragm unit installation is fixed on direction formula mounting bracket, and the fixed counter weight body in diaphragm bottom fixes the anchor clamps of top centre gripping HDPE diaphragm to through the euphroe device to the diaphragm tensioning on direction formula mounting bracket, then the crane lifts by crane and sets up the diaphragm in the slotted hole, and fixes a position fixedly and hangs, takes out direction formula mounting bracket, washs back used repeatedly.
As a preferred embodiment of the present invention, the procedure of arranging the HDPE film units under the reel-type mounting frame is as follows: the HDPE membrane unit process is arranged below the winding drum type mounting frame as follows: the HDPE diaphragm unit is wound on a winding drum frame, the bottom end of the HDPE diaphragm unit is arranged outside, a diaphragm balance weight clamp is fixed at a slot port, the HDPE diaphragm unit is arranged below a winding drum in a matching mode through a crane, an additional balance weight frame connected with the bottom of the HDPE diaphragm is lifted, the HDPE diaphragm is slowly arranged in a slot hole under a manual operation winding drum, the HDPE diaphragm unit is fixedly suspended in a positioning mode, and then the additional balance weight frame is taken out by the crane.
In a preferred embodiment of the present invention, the i-steel joint method comprises the following steps: the joint film section of the first-stage HDPE film unit fixedly covers a wing plate on one side of the whole I-shaped steel, and a T-shaped lock made of HDPE material is welded at the end part extending to the second-stage HDPE film unit; the joint membrane section installation of HDPE diaphragm unit is fixed inboard at homonymy pterygoid lamina after the clear hole of second phase groove section unit, HDPE diaphragm joint membrane section tip sets up the slow expansion type waterstop with pterygoid lamina laminating department, the pre-buried grout floral tube of another tip, the joint membrane section of the HDPE diaphragm unit of first phase and the joint membrane section butt joint back of second phase HDPE diaphragm unit, grout through the grout floral tube, carry out the fixed between the diaphragm by T type lock and ground paste, accomplish the overlap joint between the diaphragm unit.
As a preferred embodiment of the present invention, when an i-steel joint is adopted, the device provided under the diaphragm unit adopts a reinforcement cage designed on a reinforced concrete underground diaphragm wall;
the HDPE membrane unit process arranged below the reinforcement cage is as follows: the HDPE diaphragm unit is attached to a reinforcement cage, an erection reinforcement is additionally processed on the reinforcement cage, the HDPE diaphragm unit is fixed on one side or two sides of the reinforcement cage through a connecting device or a fixing band welded on the diaphragm, and the HDPE diaphragm unit is arranged in place along with the reinforcement cage.
In a second aspect, the embodiment of the invention further provides an HDPE film composite underground continuous wall structure, the composite underground continuous wall structure is constructed by the construction method, HDPE film units are arranged below one side or two sides of the concrete underground continuous wall, and the bottom ends of the film units are provided with balance weights.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the HDPE membrane adopted by the HDPE membrane composite underground continuous wall structure and the construction method can be rough, has better bonding performance with concrete, and can also transmit friction force to the stratum, and the HDPE membrane becomes a corresponding breadth of a unit groove section of the underground continuous wall through hot-melt welding and is not influenced by depth; the HDPE membranes are arranged on the outer side or the inner side and the outer side of the underground continuous wall, are arranged below the concrete, are tightly attached to the HDPE membranes after being poured, and physically separate the concrete from being in contact with air, underground water, a heavy chemical environment or other corrosive environments; under the condition that cement and steel bars have no environmental invaders, the corrosive reaction of the reinforced concrete of the underground continuous wall is necessarily greatly slowed down; the composite underground diaphragm wall is applied to important underground rail stations, transformer substations, pipe galleries, maritime engineering or heavy chemical engineering environments, the seepage resistance and the durability of the composite underground diaphragm wall can be obviously improved, the service life of the whole structure is further prolonged, and possibility is provided for history inheritance of classical engineering.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of an HDPE membrane composite underground continuous wall according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an HDPE membrane composite underground continuous wall in another embodiment of the invention;
FIG. 3 is a flow chart of a construction method of an HDPE membrane composite underground continuous wall structure provided by the embodiment of the invention;
FIG. 4 is a schematic view of the joint pipe type lap joint of HDPE membrane units in the composite underground continuous wall structure according to one embodiment of the present invention;
FIG. 5 is a schematic illustration of butt-joint overlapping of HDPE membrane units in a composite diaphragm wall structure according to another embodiment of the present invention;
fig. 6 is a schematic view of the joint plate type lap joint of HDPE film sheet units in the composite underground continuous wall structure according to still another embodiment of the present invention;
FIG. 7 is a schematic view of the joint of FIGS. 4-6 according to the present invention;
FIG. 8 is a schematic view of the I-beam joint type overlapping of HDPE membrane units in a composite underground diaphragm wall structure according to still another embodiment of the present invention;
fig. 9 is a schematic view of the joint of fig. 8 according to the present invention.
Description of reference numerals:
10-level zero; 20-the surface layer; 30-formation two; 40-formation three; 50-formation four; 60-a relatively impermeable layer; 01-concrete underground continuous wall; (02, 021, 022) -HDPE membrane element; (03, 031, 032) -a counterweight; 04-guiding a limiting steel bar; 05-HDPE membrane seams; 06-HDPE membrane joints; 061-first-stage membrane seam film segment; 062-T type lock; 063-grouting floral tubes; 064-second stage membrane seam film section; 065-water stop; 07-I-steel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a HDPE film composite underground continuous wall structure and a construction method. In the current concrete structure construction, measures such as brushing waterproof anticorrosive paint or laying waterproof geotextile are generally adopted for the open cut construction foundation structure which is in a foundation for a long time so as to improve the foundation impermeability and durability. Most of the existing underground projects with great burial depth need to adopt underground structures of underground continuous walls, and some underground structures are below underground water, so that higher requirements on seepage prevention and durability are provided. Based on this, the HDPE film composite underground continuous wall structure and the construction method provided by the embodiment of the invention firstly utilize bentonite slurry or polymer slurry as stable slurry in the excavation process of an underground groove section, after excavation and hole cleaning are completed, the HDPE film units are vertically arranged downwards to one side or two sides of the underground continuous wall, and fig. 1 is a schematic structural diagram of arranging the HDPE film units downwards at one side of the underground continuous wall; fig. 2 is a schematic structural diagram of HDPE film units arranged below two sides of an underground continuous wall. After the concrete is poured under the slurry, the HDPR membrane is tightly attached to the concrete wall; the diaphragm overlap joint between unit groove section combines underground continuous wall's joint form, adopts modes such as mutual overlap joint arrangement, installation slow setting type sealing rod or floral tube grout to realize high reliability overlap joint, guarantees HDPE membrane and underground continuous wall's composite construction's reliability.
Fig. 3 is a flow chart of a method for constructing an HDPE film composite underground continuous wall structure according to an embodiment of the invention. As shown in fig. 3, the construction method includes the steps of:
and step S1, preparing HDPE membrane units matched with the groove sections of the continuous wall units and welding connecting devices or fixing belts according to the parameters of the underground continuous wall, and preparing the counterweight bodies.
In this step, the HDPE membrane units are finished in a factory. The maximum width of the HDPE membrane reaches 7m, the thickness of the HDPE membrane reaches 3mm, the HDPE membrane is usually welded by hot melting, and the HDPE membrane is welded and combined into an HDPE membrane unit with a required size according to the parameters of the underground continuous wall. HDPE diaphragm unit welds on work platform, and the diaphragm tip adopts hot melt welding or extrudes welded connection device such as membrane cover or HDPE fixed band for fixed HDPE diaphragm unit.
The specific gravity of the HDPE diaphragm is smaller than that of slurry, an HDPE diaphragm unit needs to be arranged below the middle of the slurry, and a counterweight body needs to be arranged at the bottom of the diaphragm. Preferably, the counterweight body adopts section steel or a concrete precast block with the strength higher than that of the concrete of the underground continuous wall, and a positioning bolt and a steel bar for guiding and positioning are arranged according to requirements.
Because HDPE diaphragm unit will descend and establish in the side of slotted hole, at HDPE diaphragm unit and set the in-process down, preset the direction orientation reinforcing bar on the counter weight body, can ensure that the diaphragm bottom leans on one side of slotted hole bottom, and the top is hung and is fixed in slotted hole one side, and does not influence subsequent pouring.
And step S2, carrying out slotted hole construction according to the concrete/reinforced concrete underground continuous wall process.
In the step, bentonite slurry or polymer slurry is used as stable slurry in the process of excavating the underground groove section when the groove hole is constructed. The underground continuous wall comprises a pure concrete underground continuous wall and a reinforced concrete underground continuous wall.
And step S3, assembling and fixing the processed diaphragm unit and the counterweight body on a device arranged below the diaphragm unit by using a welding connection device or a fixing band on a construction site.
In the step, according to different joint forms, the diaphragm unit lower setting device adopts three modes of a guide type mounting frame, a winding drum type mounting frame or a device attached to a reinforcement cage. The guide type mounting frame is formed by welding channel steel and other I-shaped steel. The guide type mounting frame comprises a suspension clamp for suspending the diaphragm at the opening of the groove, a tensioning rope device, an opening suspension and flat steel for fixing the balance weight.
And step S4, after the underground continuous wall slot is excavated and the slurry is changed and the hole is cleaned, installing a lower setting device through the diaphragm unit, and arranging an HDPE diaphragm unit provided with a counterweight body below one side or both sides of the underground continuous wall unit slot in position in the reinforced concrete underground continuous wall slot.
In the step, different lower setting devices are selected according to different joint forms, and different lower setting modes correspond to different lower setting processes.
When adopting direction formula mounting bracket to set up down, will HDPE diaphragm unit installation is fixed on the direction mounting bracket, and fixed bottom diaphragm counter weight fixes the anchor clamps of top centre gripping HDPE diaphragm to through euphroe device to the diaphragm tensioning on the leading truck, then the crane lifts by crane and sets up to the slotted hole in, and fixes a position and hang, takes out the leading truck.
When adopting reel formula mounting bracket to set up, to above-mentioned HDPE diaphragm unit around rolling up on the reel frame, the bottom is outside, at the fixed bottom diaphragm counter weight anchor clamps in groove drill way mouth, if the hole is darker, need the crane cooperation reel to set up, lift by crane the extra counterweight frame that links to each other with HDPE diaphragm bottom, the manual operation reel slowly sets up in HDPE diaphragm to the slotted hole to fix a position fixedly and hang, then the crane takes out extra counterweight frame.
When adopting mode attached to on the steel reinforcement cage to set up, erect the reinforcing bar through additionally processing on the steel reinforcement cage to above-mentioned HDPE diaphragm unit, fix one side or both sides at the steel reinforcement cage through the HDPE connecting device of welding on the diaphragm like membrane sleeve or fixed band, along with the integrative lower dress of steel reinforcement cage and take one's place, this kind of mode bottom can not need the counter weight and directly fix to the reinforcing bar on.
And step S5, hanging the device below the membrane unit and hanging the membrane unit on the side surface of the slotted hole.
And step S6, continuing construction according to the concrete/reinforced concrete underground continuous wall process in the slotted hole in which the HDPE membrane unit is hung, and finishing the compounding of the HDPE membrane unit and the underground continuous wall on one side or two sides after the concrete is hardened.
In the step, when the underground continuous wall is a pure concrete wall, a concrete guide pipe is arranged downwards, concrete of the underground continuous wall is poured under slurry to a preset height, when the underground continuous wall is a reinforced concrete wall, after the HDPE diaphragm unit is arranged downwards, the concrete pouring guide pipe is arranged downwards in time, and the concrete under slurry is poured normally. And (3) pouring the ascending speed in the pouring process, and enabling the HDPE membrane to be located at the outer side position of the underground continuous wall all the time until the concrete is poured to the designed height, so that the HDPE membrane is compounded on the outer side of the concrete. And (3) finishing the compounding of the HDPE membrane unit and the single side or the double sides of the underground continuous wall after the concrete is hardened.
When the underground continuous wall is carried out in multiple stages, the HDPE membrane units in the first stage and the second stage of engineering need to be lapped. The construction method may further include:
and step S7, after the first-stage underground continuous wall unit is finished, when the second-stage underground continuous wall unit is constructed, the HDPE membrane units arranged below the first-stage underground continuous wall unit are arranged in a lap joint mode, and a complete composite underground continuous wall structure is formed after the first-stage and second-stage underground continuous walls are poured.
In this step, the down setting process in step S4 is extended, and step S4 describes the way of down setting the slotted hole or the HDPE film unit in the normal case. When the diaphragm unit related to the second stage engineering is arranged below, the lapping with the first stage engineering diaphragm is needed. Because the construction of the underground continuous wall is carried out for a plurality of periods of construction, such as the lap joint of the underground continuous wall between the first period of engineering and the second period of engineering, the lap joint of the wall body comprises the lap joint of HDPE membrane units.
In a particular embodiment of the invention, the joint is in the form of a union-pipe joint. As shown in fig. 4, the joint 06 of the HDPE film units constructed in the first and second stages of the joint pipe method at the joint seam 05 is semicircular, and the two semicircles are butted to complete the lap joint of the HDPE film units in the second stage. In another embodiment of the invention, as shown in fig. 5, the joint is in the form of a butt joint, either grab direct grooving or slot milling grooving; in yet another embodiment of the invention, as shown in fig. 6, the joint is in the form of a joint plate method with rubber water stop mounted in the middle of the joint.
As shown in fig. 7, when the joint is performed by the joint pipe method, or butt joint method, or joint plate method, a joint film segment 061 of a first-stage groove HDPE film is disposed to the end of the concrete joint and extends toward the middle of the wall body, which may be one-third of the joint film segment 061. The T-shaped lock 062 made of HDPE is welded on the seam membrane section 061 so as to be tightly combined with the first-stage concrete and not to fall off when the second-stage groove is constructed. And during second-stage excavation, the first-stage concrete and the installed HDPE membrane are prevented from being damaged as much as possible. After the second-stage slotted hole is excavated and the bottom of the concrete is cleaned, a second-stage HDPE diaphragm unit is arranged below the first-stage slotted hole, one or more slowly-expanding water stop strips 065 are bonded at the head of a joint diaphragm section 064 of the second-stage HDPE diaphragm unit, and a chemical grouting floral tube 063 is pre-buried and fixed at the tail of the joint diaphragm unit, so that the high seepage-proofing performance of the lap joint part between the HDPE diaphragm units is ensured, and the maximum compound protection of the concrete is realized.
When the joint is performed by adopting a joint pipe method, a butt joint method or a joint plate method, the HDPE membrane unit is arranged below in a guide frame or reel frame mode.
In a further embodiment of the invention, as shown in figure 8, the joint is in the form of an i-steel joint, such as an i-steel or a king-wire. At this time, a reinforcement cage is used as a diaphragm unit lower setting device.
As shown in fig. 9, taking an i-steel as an example, when an i-steel joint is adopted, a seam film section 061 of an HDPE membrane of a first-stage groove section unit fixedly covers a side wing plate of the whole i-steel 07, and a T-shaped lock 062 made of HDPE is welded to the end part extending to the second-stage HDPE membrane; after the hole cleaning of the second-stage groove section unit is finished, the joint membrane section 064 of the HDPE membrane unit is installed and fixed on the inner side of a wing plate on the same side, a slowly-expanding type water stop belt 065 is arranged at the joint of the end part of the joint membrane section 064 of the HDPE membrane and the wing plate as required, and a chemical grouting floral tube 063 is embedded and fixed at the other end part of the joint membrane section 064, so that the HDPE membrane including the joint wing plate is protected.
After the second-stage groove section concrete has the preset strength, the expansion-type waterstop is expanded to realize high-standard water stopping; and performing chemical grouting or cement grouting on the joints of the pre-buried grouting pipes to realize permeation reinforcement of the diaphragm joints and complete the lap joint of the composite underground continuous wall.
Based on the construction method of the HDPE membrane composite underground continuous wall structure, the embodiment of the invention also provides the HDPE membrane composite underground continuous wall structure, and the composite underground continuous wall structure is constructed by the construction method.
As shown in fig. 2 and 3, the composite diaphragm wall extends through the surface of the earth 20 including the leveling zero 10, the second formation 30, the third formation 40, the fourth formation 50, and terminates in a relatively impermeable layer 60. In one embodiment, the composite underground continuous wall includes a concrete underground continuous wall 01, HDPE membrane units 02 disposed on one side of the concrete underground continuous wall (or HDPE membrane units 021 and 022 on both sides of the underground continuous wall), and a weight 03 having guide position-limiting reinforcing bars 04 (corresponding to 031 and 032 on both sides). The counterweight body 03 is arranged at the bottom end of the HDPE diaphragm unit, and the guide limiting reinforcing steel bar taking the counterweight body as a starting point is transversely positioned at the bottom of the concrete underground continuous wall 01. In another embodiment, as shown in fig. 3, the composite underground continuous wall structure is substantially the same as the above embodiment except that it includes HDPE film sheet units disposed on both sides of the concrete underground continuous wall. When multi-stage engineering construction is carried out, the composite underground continuous wall structure comprises the lap joint between the HDPE membrane units in the previous stage and the current HDPE membrane units.
The HDPE film composite underground continuous wall structure is characterized in that at least one layer of HDPE film units are arranged below one side of the underground continuous wall, which needs to be protected, such as a water-facing side. The HDPE diaphragm unit is matched with the length and depth of the wall section of the underground continuous wall unit, and the diaphragm unit is provided with a linking treatment device at the end part of the underground continuous wall unit, so that the HDPE film is compounded on the water facing side of the conventional concrete underground continuous wall or reinforced concrete underground continuous wall.
It should be noted that the HDPE film composite underground continuous wall structure is produced by the construction method of the composite underground continuous wall structure, and the description and limitation of the construction method are also applicable to the composite underground continuous wall structure, and the related description is not repeated.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (10)
1. The construction method of the HDPE film composite underground continuous wall structure is characterized by comprising the following steps:
step S1, HDPE diaphragm units matched with the groove sections of the diaphragm wall units and welding connecting devices or fixing belts are prepared according to the parameters of the underground diaphragm wall, and counterweight bodies are prepared;
step S2, carrying out slotted hole construction according to the concrete/reinforced concrete underground continuous wall process;
step S3, the processed diaphragm unit and the counterweight body are assembled and fixed on the device arranged below the diaphragm unit by using a welding connection device or a fixing band on the construction site;
step S4, after the underground continuous wall slot is excavated and the slurry is changed and the hole is cleaned, HDPE diaphragm units provided with counterweight bodies are arranged on one side or both sides of the underground continuous wall unit slot through the diaphragm unit lower arrangement device to be in place in the slot hole of the underground continuous wall;
step S5, hanging out the device under the membrane unit and hanging the membrane unit on the side of the slotted hole;
and step S6, continuing construction according to the concrete/reinforced concrete underground continuous wall process in the slotted hole in which the HDPE membrane unit is hung, and finishing the compounding of the HDPE membrane unit and the underground continuous wall on one side or two sides after the concrete is hardened.
2. The method of constructing an HDPE film composite underground continuous wall structure as claimed in claim 1, wherein the construction method further comprises:
and step S7, after the first-stage underground continuous wall unit is finished, when the second-stage underground continuous wall unit is constructed, the HDPE membrane units arranged below the first-stage underground continuous wall unit are arranged in a lap joint mode, and a complete composite underground continuous wall structure is formed after the first-stage and second-stage underground continuous walls are poured.
3. The method for constructing the HDPE film composite underground continuous wall structure as claimed in claim 2, wherein the concrete underground continuous wall process adopts a joint mode for the HDPE film units according to different lap joint modes, and the joint mode comprises the following steps: a joint pipe mode, a butt joint mode, a joint plate mode of installing rubber water stop in the middle of a joint and an I-shaped steel joint mode.
4. The method for constructing an HDPE film composite underground continuous wall structure according to claim 3, wherein the joint pipe type, butt joint type and joint plate type are constructed by the following steps:
arranging a joint film section of the first-stage HDPE film unit at the end part of the concrete joint and extending towards the middle part of the slotted hole end, and welding a T-shaped lock made of HDPE on the joint film section; after the second-stage slotted hole is excavated and cleaned, a second-stage HDPE membrane unit is arranged below, at least one slow expansion type water stop strip is bonded at the head of a joint membrane section of the second-stage HDPE membrane unit, and a pre-embedded grouting floral tube is fixed at the tail of the joint membrane section; after the whole construction of the continuous wall is finished, the joint film section of the first-stage HDPE film unit is connected with the joint film section of the second-stage HDPE film unit, and grouting is carried out through a grouting perforated pipe so as to seal a potential permeation channel.
5. The method for constructing an HDPE film composite underground continuous wall structure as claimed in claim 4, wherein the means for arranging the lower portion of the membrane unit is a guide type mounting frame or a reel type mounting frame when the joint is performed by using a pipe joint method, a butt joint method and a joint plate method.
6. The method for constructing the HDPE film composite underground continuous wall structure as claimed in claim 5, wherein the HDPE film units are arranged below the guiding type mounting frame in the following process: will HDPE diaphragm unit installation is fixed on direction formula mounting bracket, and the fixed counter weight body in diaphragm bottom fixes the anchor clamps of top centre gripping HDPE diaphragm to through the euphroe device to the diaphragm tensioning on direction formula mounting bracket, then the crane lifts by crane and sets up the diaphragm in the slotted hole, and fixes a position fixedly and hangs, takes out direction formula mounting bracket, washs back used repeatedly.
7. The method for constructing the HDPE film composite underground continuous wall structure as claimed in claim 5, wherein the HDPE film units are arranged below the reel type mounting frame in the following process: the HDPE diaphragm unit is wound on a winding drum frame, the bottom end of the HDPE diaphragm unit is arranged outside, a diaphragm balance weight clamp is fixed at a slot port, the HDPE diaphragm unit is arranged below a winding drum in a matching mode through a crane, an additional balance weight frame connected with the bottom of the HDPE diaphragm is lifted, the HDPE diaphragm is slowly arranged in a slot hole under a manual operation winding drum, the HDPE diaphragm unit is fixedly suspended in a positioning mode, and then the additional balance weight frame is taken out by the crane.
8. The method for constructing the HDPE film composite underground continuous wall structure as claimed in claim 3, wherein the I-shaped steel joint mode comprises the following joint processes: the joint film section of the first-stage HDPE film unit fixedly covers a wing plate on one side of the whole I-shaped steel, and a T-shaped lock made of HDPE material is welded at the end part extending to the second-stage HDPE film unit; the joint membrane section installation of HDPE diaphragm unit is fixed inboard at homonymy pterygoid lamina after the clear hole of second phase groove section unit, HDPE diaphragm joint membrane section tip sets up the slow expansion type waterstop with pterygoid lamina laminating department, the pre-buried grout floral tube of another tip, the joint membrane section of the HDPE diaphragm unit of first phase and the joint membrane section butt joint back of second phase HDPE diaphragm unit, grout through the grout floral tube, carry out the fixed between the diaphragm by T type lock and ground paste, accomplish the overlap joint between the diaphragm unit.
9. The construction method of the HDPE film composite underground continuous wall structure of claim 8, wherein when an I-shaped steel joint mode is adopted, the lower installation device of the diaphragm unit adopts a reinforcement cage designed on the reinforced concrete underground continuous wall;
the HDPE membrane unit process arranged below the reinforcement cage is as follows: the HDPE diaphragm unit is attached to a reinforcement cage, an erection reinforcement is additionally processed on the reinforcement cage, the HDPE diaphragm unit is fixed on one side or two sides of the reinforcement cage through a connecting device or a fixing band welded on the diaphragm, and the HDPE diaphragm unit is arranged in place along with the reinforcement cage.
10. An HDPE film composite underground continuous wall structure, which is constructed by the construction method of any one of claims 1 to 9, wherein HDPE membrane units are arranged under one side or both sides of the concrete underground continuous wall, and the bottom ends of the membrane units are provided with balance weights.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023215527A3 (en) * | 2022-05-04 | 2023-12-21 | Michael George Butler | Quickly-deployable automated rapid-slip-form concrete placement system |
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