CN110616669B - Construction method of high polymer impervious wall - Google Patents

Abstract

The invention discloses a construction method of a high polymer impervious wall, which specifically comprises the following steps: step one, construction lofting; step two, equipment installation: installing according to design; step three, static pressure grooving: static pressure grooving equipment is utilized, the grooving mold is aligned to the position of the slotted hole arranged in the first step and is pressed into the soil body in a static manner, and after the preset design depth is reached, a preorder slotted hole is formed; step four, lifting grouting: grouting is carried out while lifting, and then the conical head is vertically pulled out upwards through the rubber rod, so that a connecting hole is formed; step five, trepanning: then the conical head is fixed on the grooving die through a binding wire, and the lower end of a guide rod on the grooving die is sleeved in a connecting hole of a preorder slotted hole; step six, forming the continuous impervious wall: and repeating the operations of static pressure grooving, lifting grouting integrated forming and trepanning to gradually form a subsequent slotted hole and a subsequent impervious wall so as to form the continuous impervious wall. The invention improves the sag and trepanning accuracy of the high polymer grouting slotted hole.

Description

Construction method of high polymer impervious wall

Technical Field

The invention belongs to the technical field of high polymer cut-off wall construction, and particularly relates to a construction method of a high polymer cut-off wall.

Background

The development of water conservancy infrastructure customs nationwide, political, social and economic is indistinguishable.

The diaphragm wall is a continuous wall structure which can improve the waterproof performance of the structure in projects such as dams in a reservoir area, coastal river roads and the like, and has important significance for guaranteeing the project safety and protecting the life and property safety of people. The cement mixing pile seepage prevention technology, the high spray grouting seepage prevention technology and the concrete wall seepage prevention technology have the defects of huge equipment, high requirements on construction site fields, difficulty in adoption of small-sized projects and the like, and the actual requirements of seepage prevention and reinforcement of the dam in danger are difficult to meet. From the last 60 years, organic polymer chemical grouting materials represented by polyurethane and grouting technology thereof are widely concerned by scholars and engineers at home and abroad, and among them, the non-aqueous reaction type high polymer material is the most widely used material for constructing the impervious wall due to the advantages of light weight, early strength, large expansion force, no pollution, good seepage-proofing performance, excellent durability and mechanical property, etc.

The lengths of guide columns on two sides of a middle conical head of the existing grooving mold are the same, a static pressure groove is adopted when a high polymer impervious wall is constructed into a groove, the grooving mold with a certain specification is pressed into a dam soil body to form a long and narrow sleeve connection groove hole mold, but the construction process can not adjust the grooving direction in the grooving process, and the problems of deviation accumulation, insufficient verticality and the like can occur; meanwhile, the guide rod of the grooving die is too short, so that the trepanning accuracy is insufficient, and the continuity and uniformity of high polymer wall forming are difficult to ensure.

Disclosure of Invention

The invention provides a construction method of a high polymer impervious wall, which aims to solve the problems that the grooving direction cannot be adjusted in the grooving process, deviation accumulation is possible and trepanning accuracy is insufficient in the construction process in the prior art.

The object of the invention is achieved in the following way:

a construction method of a high polymer impervious wall specifically comprises the following steps:

step one, construction lofting, namely arranging the positions of slotted holes according to design requirements;

step two, equipment installation: firstly, a level gauge is arranged beside a clamping box slideway of a static force groove pressing machine, a grouting pipe is arranged in a middle taper rod in a grooving mold according to the verticality of the level gauge when groove pressing is adjusted, the upper end of the grouting pipe extends to the ground and is communicated with a grouting gun, a separable taper head is arranged on one side of the grooving mold, a guide rod is arranged on the other side of the grooving mold, and the lower end of the guide rod extends downwards along the middle taper rod;

step three, static pressure grooving: static pressure grooving equipment is utilized, the grooving mold is aligned to the position of the slotted hole arranged in the first step and is pressed into the soil body in a static manner, and after the preset design depth is reached, a preorder slotted hole is formed;

step four, lifting and grouting to form a whole body: lifting a grooving mold upwards by using static pressure grooving equipment, starting a grouting gun to perform grouting through a grouting pipe, expanding grout from bottom to top through chemical reaction volume to fill a slot hole to form a sheet high polymer anti-seepage body, separating a conical head from the grooving mold and remaining in the slot hole during the lifting, completing grouting simultaneously when the lifting is completed, forming a preorder anti-seepage wall, and vertically pulling out the conical head upwards through a rubber rod to form a connecting hole;

step five, trepanning: then the conical head is fixed on the grooving die through a binding wire, and the lower end of a guide rod on the grooving die is sleeved in a connecting hole of a preorder slotted hole;

step six, forming the continuous impervious wall: repeating the operations of static pressure grooving, lifting grouting integrated forming and trepanning to gradually form a subsequent slotted hole and a subsequent impervious wall so as to form the continuous impervious wall;

step seven: and (3) finishing the construction of the high polymer impervious wall: and after grouting is completed on all the slotted holes and the design strength is reached, the construction of the impervious wall is completed.

The gradienter is a double-shaft measuring column electronic gradienter.

The rubber stick is soft rubber stick, and soft rubber stick wraps up outward has the abrasionproof layer that is used for reducing its and soil body frictional force.

The anti-abrasion layer is a polyethylene resin film.

Compared with the prior art, the invention has the following advantages:

1. the length of the guide rod on one side of the grooving blade is set to be longer than that of the middle taper rod and extends out along the lower end of the middle taper rod, so that the guide rod can be connected in the last slotted hole of the adjacent preorder slotted hole when constructing a postorder slotted hole, the grooving direction can be conveniently adjusted when the postorder slotted hole is grooved, the trepanning accuracy can be improved, and the problem of deviation accumulation is further reduced; the lengthened guide rod can ensure better lap joint between the front slotted hole and the rear slotted hole so as to form a wall continuously;

2. the detachable conical head is arranged on the other side of the grooving blade and connected with the rubber rod, so that when the grooving die is pulled out after being constructed into a groove, the conical head and the grooving blade can be separated, the conical head and the rubber rod connected with the conical head can realize the up-and-down communication and exchange of the external air and the air in the groove hole, the balance of the air pressure inside and outside the groove hole can be ensured, the phenomenon that the vacuum in the groove hole on the lower part cannot be discharged due to the fact that the grooving die is pulled out is effectively avoided, and the formation of a positioning lap joint hole with a preorder groove hole during the construction of the subsequent groove hole is facilitated;

3. the device is provided with the high polymer diaphragm wall construction equipment integrating lifting and grouting, so that high polymer grouting is carried out while a grooving mold is lifted, the lifting speed and the grouting pressure are controlled, the vacuum caused by the fact that the mold is pulled out in the original equipment process is effectively avoided, the expansive force generated by chemical reaction of the high polymer is utilized simultaneously, the slotted hole is rapidly filled, the occurrence of hole collapse and hole shrinkage is prevented, and the wall quality is more compact and uniform.

Drawings

FIG. 1 is a schematic structural view of the grooving die of the present invention.

FIG. 2 is a schematic view of the operation and sag control of the polymer diaphragm wall construction equipment.

Fig. 3 is a side view of a groove hole formed on a dam.

FIG. 4 is a schematic of a panel of a Digi-Pas DWL 1000XY dual axis column electron level.

FIG. 5 is a schematic diagram of the wall-forming effect of high polymer.

Fig. 6 is a top view of fig. 5.

The device comprises a rubber rod 1, a conical head 2, a middle conical rod 3, a middle conical rod 4, a guide rod 5, a grooving blade 6, a grouting pipe 7, a grouting gun 8, a dam 9, a grooving mold 10, a front slotted hole 11, a rear slotted hole 12, a grooving rod 13, a clamping box 14, a level gauge 15, a static grooving machine 16 and a slotted hole.

Detailed Description

As shown in fig. 1, an impervious wall grooving mold comprises a grooving blade 5, wherein a vertical middle conical rod 3 is mounted in the middle of the grooving blade 5, a vertical guide rod 4 is mounted at the edge of one side of the grooving blade 5, the lower end of the guide rod 4 extends downwards along the lower end of the middle conical rod 3, a separable conical head 2 is mounted at the edge of the other side of the grooving blade 5, a rubber rod 1 is connected to the upper end of the conical head 2, and the upper end of the rubber rod 1 extends to the ground. The grooving blade 5 is composed of a left blade and a right blade, both of which are trapezoidal, as shown in fig. 1. The lower end of the middle conical rod 3 is conical.

In order to realize simultaneous lifting and grouting, the middle taper rod 3 is of a hollow structure, wherein a cavity body is used for installing a grouting pipe 6. The injection pipe can be directly brought into the specified depth in the pressing process of the mold, and secondary disturbance to the hole wall when the drilling tool is pulled out and then the injection pipe is poured is avoided.

In order to facilitate the separation of the conical head 2, the conical head 2 is fixed on the grooving blade 5 through a binding wire (not shown in the figure), and the grooving blade 5 is provided with a corresponding fixing hole (not shown in the figure) for the binding wire to be fixed through the hole. Due to the limited strength of the binding wires, when the grooving die 9 is pulled out, the binding wires are broken under tension, the grooving die 9 is separated from the conical head 2, and the conical head 2 and the rubber rod 1 are left in the grooving holes.

Preferably, the rubber rod 1 is a soft rubber rod, and an anti-abrasion layer for reducing the friction force between the soft rubber rod and the soil body is wrapped outside the soft rubber rod.

Preferably, the wear-resistant layer is a polyethylene resin film.

As shown in fig. 2, the invention also provides a high polymer impervious wall construction device, which comprises the impervious wall grooving mold 9 and a static grooving machine 15, wherein a grouting pipe 6 is arranged in the middle taper rod 3 of the grooving mold, the top end of the grouting pipe is connected with a grouting gun 7 positioned on the ground, and the grooving mold is arranged on the static grooving machine 15. The grouting pipe 6 and the grouting gun 7 are bonded by an adhesive tape, a spray head is not designed at the lower end of the grouting pipe, the spray head can be installed, and when the spray head is installed, the spray head is completely accommodated in the middle conical rod 3. The static groove rolling machine 15 is a prior art, preferably a crawler-type static groove rolling machine, and the static groove rolling machine 15 may be a device manufactured by nyc 60B, a model of which is manufactured by shinan skyscraper and engineering equipment limited company, or may be other existing devices.

In order to ensure the perpendicularity of the static groove pressing, as shown in fig. 3, a level gauge 14 for detecting the perpendicularity of the grooving mold is mounted on a clamping box slide way of the static groove pressing machine 15.

Preferably, the level is a dual axis dipstick electronic level. Specifically, a Digi-Pas DWL 1000XY dual-axis column-measuring electronic level is adopted, and the electronic level has the following advantages: 1) the measuring range is 0-90 degrees, the X/Y axes are synchronously measured, and angles and graphs are digitally displayed; 2) four orientation icons indicating measurement angles (X/Y axes); 3) the resolution is as high as 0.1 degree, the highest precision can reach +/-0.05 degree under 0 degree, and the precision can be +/-0.2 degree under other angles; 4) there is an audible cue at 0 °, 90 ° or a specified angle.

The construction method of the high polymer impervious wall comprises the following steps:

step one, construction lofting, namely arranging the position of a slotted hole 16 according to design requirements;

step two, equipment installation: firstly, a level meter 14 is arranged beside a clamping box slideway of a static force groove pressing machine 15, a grouting pipe 6 is arranged in a middle conical rod 3 in a grooving mold 9 according to the verticality of the level meter 14 during groove pressing, the upper end of the grouting pipe extends to the ground and is communicated with a grouting gun 7, a detachable conical head 2 is arranged on one side of the grooving mold 9, a guide rod 4 is arranged on the other side of the grooving mold, and the lower end of the guide rod 4 extends downwards along the middle conical rod 3;

step three, static pressure grooving: utilizing static pressure grooving equipment to press the grooving mold 9 into the soil body in a static force manner at the position aligned with the slotted hole 16 arranged in the first step, and forming a preorder slotted hole 10 after reaching a preset design depth, as shown in figure 2;

step four, lifting and grouting to form a whole body: lifting a grooving mold 9 upwards by using static pressure grooving equipment, starting a grouting gun to perform grouting through a grouting pipe, expanding grout from bottom to top through chemical reaction volume to fill a slot hole 16 to form a sheet high polymer anti-seepage body, separating a conical head 2 from the grooving mold 9 and remaining in the slot hole 16 during the lifting, completing the grouting simultaneously when the lifting is completed, forming a preorder anti-seepage wall, and vertically pulling out the conical head 2 upwards through a rubber rod 1 to form a connecting hole;

step five, trepanning: then the conical head 2 is fixed on the grooving die 9 through a binding wire, and the lower end of the guide rod 4 on the grooving die 9 is sleeved in the connecting hole of the preorder slotted hole 10;

step six, forming the continuous impervious wall: repeating the operations of static pressure grooving, lifting grouting integrated forming and trepanning to gradually form a subsequent slotted hole 11 and a subsequent impervious wall so as to form the continuous impervious wall, as shown in figures 5 and 6;

step seven: and (3) finishing the construction of the high polymer impervious wall: and after grouting is completed on all the slotted holes and the design strength is reached, the construction of the impervious wall is completed.

The invention improves the sag and trepanning accuracy of the high polymer grouting groove hole, effectively reduces the mold offset in the construction process, simultaneously can enable the high polymer wall to be more compact and homogeneous, provides advanced, efficient, accurate and practical technical measures for the seepage-proofing reinforcement of reservoir dams, coastal river roads and soft soil areas, prevents the defects of water leakage and the like in the reservoir dams and the coastal river roads and realizes the seepage-proofing reinforcement of building structures.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims (2)

1. A construction method of a high polymer impervious wall is characterized in that: the method specifically comprises the following steps:

step one, construction lofting, namely arranging the position of a slotted hole (16) according to design requirements;

step two, equipment installation: firstly, a level gauge (14) is arranged beside a clamping box slideway of a static force grooving machine (15), a grouting pipe (6) is arranged in a middle taper rod (3) in a grooving mold (9) according to the verticality of the level gauge (14) during grooving adjustment, the upper end of the grouting pipe extends to the ground and is communicated with a grouting gun (7), a separable taper head (2) is arranged on one side of the grooving mold (9), a guide rod (4) is arranged on the other side of the grooving mold, and the lower end of the guide rod (4) extends downwards along the middle taper rod (3); the gradienter (14) is a double-shaft measuring column electronic gradienter;

step three, static pressure grooving: utilizing static pressure grooving equipment to press a grooving mold (9) into a soil body in a static force manner at the position aligned with the slotted hole (16) arranged in the step one, and forming a pre-arranged slotted hole (10) after reaching a preset design depth;

step four, lifting and grouting to form a whole body: lifting a grooving mold (9) upwards by using static pressure grooving equipment, starting a grouting gun (7) to perform grouting through a grouting pipe (6), expanding grout from bottom to top through chemical reaction volume to fill a slotted hole (16) to form a sheet high polymer impermeable body, separating a conical head (2) from the grooving mold (9) and remaining in the slotted hole (16) during lifting, completing grouting simultaneously when lifting is completed, forming a preorder impermeable wall, and vertically pulling the conical head (2) upwards through a rubber rod (1) to form a connecting hole; the rubber rod (1) is a soft rubber rod, and an anti-abrasion layer for reducing the friction force between the soft rubber rod and a soil body is wrapped outside the soft rubber rod;

step five, trepanning: then the conical head (2) is fixed on the grooving die (9) through a binding wire, and the lower end of a guide rod (4) on the grooving die (9) is sleeved in a connecting hole of a preorder slotted hole (10);

step six, forming the continuous impervious wall: repeating the operations of static pressure grooving, lifting grouting integrated formation and trepanning to gradually form a subsequent slotted hole (11) and a subsequent impervious wall so as to form the continuous impervious wall;

step seven: and (3) finishing the construction of the high polymer impervious wall: and after grouting is completed on all the slotted holes and the design strength is reached, the construction of the impervious wall is completed.

2. The method for constructing a high polymer impermeable wall according to claim 1, wherein: the anti-abrasion layer is a polyethylene resin film.

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