CN113202084A

CN113202084A - Embedded type sleeve milling joint method for underground diaphragm wall

Info

Publication number: CN113202084A
Application number: CN202110618024.3A
Authority: CN
Inventors: 张�杰; 王鹏; 赵艳彬; 张少敏; 袁宇; 李果
Original assignee: Shanghai Yuanfang Groundwork Engineering Co ltd; China Railway 19th Bureau Group Co Ltd
Current assignee: Shanghai Yuanfang Groundwork Engineering Co ltd; China Railway 19th Bureau Group Co Ltd
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2021-08-03

Abstract

The invention provides an embedded sleeve milling joint method for an underground continuous wall, which comprises a poured first-stage groove wall body, wherein a hollow section between adjacent first-stage groove wall bodies is a grooved second-stage groove, a reinforcement cage for pouring concrete is arranged in the first-stage groove wall body, sealing ribs on two sides of the reinforcement cage are plain end ribs, a plurality of PVC pipes are arranged on the plain end ribs on two sides of the reinforcement cage, the PVC pipes are longitudinally and continuously arranged, the PVC pipes are milled and crushed by a groove milling machine when concrete is milled by the groove milling machine during grooving of the second-stage groove, a groove is formed at the position of each PVC pipe, and the concrete poured by the second-stage groove is tightly occluded with the groove. The construction is simple, the construction cost is saved, the engaging force of the concrete at the joint is improved, the joint quality and the construction safety are ensured, the anti-seepage effect is good, the practicability is excellent, the construction of the underground diaphragm wall is facilitated, and the application prospect is wide.

Description

Embedded type sleeve milling joint method for underground diaphragm wall

Technical Field

The invention relates to the technical field of underground continuous walls, in particular to an embedded sleeve milling joint method for an underground continuous wall.

Background

The underground continuous wall is characterized in that a trenching machine is adopted on the ground, a long and narrow deep groove is excavated along the peripheral axis of a deep excavation project under the condition of slurry wall protection, a reinforcement cage is hung in the groove after the groove is cleared, then underwater concrete is poured by a conduit method to form a unit groove section, and a continuous reinforced concrete wall is built underground section by section to serve as a structure for intercepting water, preventing seepage, bearing and retaining water.

The quality of the underground continuous wall groove section joint is very important, and if the construction quality of the joint is in a problem, the leakage phenomenon of the enclosure structure can be caused, and the use of the underground structure can be directly influenced. The leakage not only affects the normal use function of the structure, but also is very difficult to process, so that effective measures must be taken to solve the hidden trouble of the problem in advance when the unit wall joint is constructed.

The types of ground wall joints commonly used at present are rigid joints, flexible joints and milling joints.

The rigid joint meets the requirements of shear resistance, bending strength and rigidity of the diaphragm wall on the premise of ensuring the connection quality between diaphragm wall groove sections, avoids the diaphragm wall joint from becoming a weak link of rigidity and strength, and generally adopts a technology of forming rigid connection on the diaphragm wall groove sections by adopting an H-shaped steel plate or a cross-shaped steel plate. The H-shaped steel plate or cross-shaped steel plate joint is complex in construction technology and high in cost, is commonly used for underground continuous wall construction of foundation pit enclosure structures with complex stress, such as subway stations and the like, and is not generally used for casing milling underground continuous wall construction.

The flexible joint is a through connection between the sections of the underground diaphragm wall groove only depending on horizontal concrete, and does not adopt a joint steel plate. The common form is rubber water stop and joint pipe.

Along with the development of a mechanical equipment manufacturing process, a novel double-wheel slot milling machine capable of performing underground continuous wall slot forming construction in a hard rock-soil stratum is developed, a novel underground continuous wall joint process is developed based on the slot forming equipment, namely, a sleeve milling joint is developed, a locking pipe and a joint profile steel are not used in the joint process, a compact underground continuous wall joint is formed by mutual engagement of concrete, and the sleeve milling joint has the advantages that the steel consumption of a rigid joint is saved, the weight of a reinforcement cage is reduced, and the construction cost is saved; the influence of the streaming on the quality of the joint is avoided, and the quality of the joint and the construction safety are ensured; the method is characterized in that the first-stage groove parts on two sides are milled to expose new concrete surfaces so that the first-stage groove concrete and the second-stage groove concrete can be tightly occluded, the joint water stopping effect is good, but the number of the ground wall joints is greatly increased by adopting a mode of milling joints, the stress and water seepage of joints in the subsequent excavation process are great hidden dangers, and the concrete occlusion force on two sides of the joints is insufficient mainly because the water seepage paths are relatively short.

In summary, in order to overcome the defects in the prior art, an embedded casing milling joint method for an underground diaphragm wall is particularly needed to solve the defects in the prior art.

Disclosure of Invention

The invention aims to provide an embedded type sleeve milling joint method for an underground diaphragm wall, which is simple in structure, capable of improving the engaging force of concrete at a joint and wide in application range.

The technical scheme adopted by the invention for solving the technical problem is as follows:

the embedded sleeve milling joint method for the underground diaphragm wall comprises a first-stage groove wall body which is formed by pouring, a hollow interval between adjacent first-stage groove wall bodies is a second-stage groove which is formed by pouring, a reinforcement cage for concrete pouring is arranged in the first-stage groove wall body, sealing ribs on two sides of the reinforcement cage are plain end ribs, a plurality of PVC pipes are arranged on the plain end ribs on two sides of the reinforcement cage, the PVC pipes are longitudinally arranged in a full-length mode, the PVC pipes are milled and crushed by a groove milling machine when the groove milling machine mills concrete during groove forming, grooves are formed in the PVC pipes, and concrete poured by the second-stage groove and the groove parts are tightly occluded.

Furthermore, the PVC pipe is fixed with the sealing ribs through iron wires, and the distance between the iron wires is 4-5 m.

Furthermore, plugs are arranged on two end faces of the PVC pipe.

Further, the shape of the groove is a curved surface.

Furthermore, the plugging adopts a dense PVC grid or a perforated PVC cover.

Furthermore, the multiple PVC pipes on the two sides of the first-stage groove wall body are arranged side by side, and the sum of the diameters of the multiple PVC pipes on the two sides of the first-stage groove wall body is smaller than the thickness of the reinforcement cage.

Furthermore, each PVC pipe is formed by longitudinally and sequentially arranging a plurality of sections of pipes with the same specification.

Furthermore, a protection block is arranged on the surface of the steel reinforcement cage.

The invention has the advantages that:

in conclusion, the invention has the advantages of scientific and reasonable structural design, simple construction, construction cost saving, good seepage-proofing effect, excellent practicability, contribution to the construction of underground continuous walls and wide application prospect, and can improve the concrete meshing force at the joints, ensure the joint quality and the construction safety.

Drawings

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

FIG. 2 is a perspective view of a first stage slotted reinforcement cage of the present invention;

FIG. 3 is a top view of the first stage slotted reinforcement cage of the present invention;

FIG. 4 is a side view of a first stage slotted reinforcement cage of the present invention;

FIG. 5 is an enlarged view of a portion of the first stage slotted reinforcement cage of the present invention;

100-steel reinforcement cage, 110-PVC pipe, 120-plug, 200-first-stage groove wall, 210-second-stage groove and 220-groove.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.

As shown in fig. 1, 2, 3, 4, and 5, the method for milling joints of an embedded casing of an underground diaphragm wall includes a first-stage groove wall 200 which is formed by casting, a second-stage groove 210 which is formed by grooves is arranged in a hollow space between adjacent first-stage groove walls, a reinforcement cage 100 for casting concrete is arranged inside the first-stage groove wall 200, sealing ribs on two sides of the reinforcement cage 100 are plain ribs, a plurality of PVC pipes 110 are arranged on the plain ribs on two sides of the reinforcement cage 100, the PVC pipes 110 are longitudinally arranged in a long manner, the second-stage groove 210 mills the PVC pipes 110 when the groove milling the concrete during groove forming, a groove 220 is formed at the position of the PVC pipes 110, the shape of the groove 220 is a curved surface, and the second-stage groove 220 realizes tight occlusion at the position where the concrete and the groove 220 are cast.

In addition, the surface of the reinforcement cage 100 is provided with a protection block, the PVC pipes 110 are fixed by iron wires and sealing ribs, the distance between the iron wires is 4-5m, each PVC pipe 110 is formed by longitudinally and sequentially arranging a plurality of sections of pipes with the same specification, both end faces of the PVC pipe 110 are provided with plugs 120, and the plugs 120 are dense PVC grids or perforated PVC covers.

The plurality of PVC pipes 110 on the two sides of the first-stage groove wall body 200 are arranged side by side, and the sum of the diameters of the plurality of PVC pipes 110 on the two sides of the first-stage groove wall body 200 is smaller than the thickness of the reinforcement cage 100.

The implementation process of the invention is as follows:

the reinforcement cage of the first-stage groove wall body adopts flat-opening sealing ribs, two PVC pipes are arranged at the positions of the sealing ribs and fixed by iron wires, every 4m of PVC pipes are longitudinally and completely arranged, two ends of each PVC pipe are limited and blocked by dense PVC grids or perforated PVC covers, and only slurry and a little cement paste can enter the PVC pipes in the processes of lowering the reinforcement cage and pouring concrete. In the construction, the width of a first-stage groove is required to be extended by 30cm when the groove is formed, the first-stage groove is used for positioning and placing a reinforcement cage according to a dividing line after the groove is formed, the verticality of the reinforcement cage is ensured during the placing, and the PVC pipe plays a limiting role on two sides of the reinforcement cage, so that the excessive left and right deviation of the reinforcement cage in the groove is avoided. The joint plate is transferred after the completion is transferred to the steel reinforcement cage, and the effect of joint plate is the second phase groove of avoiding upper portion concrete to flow into not grooving, and the milling flutes machine bucket support body can't directly transfer and get into the second phase groove when leading to the initial grooving of second phase groove, waits that the concrete pours and accomplishes the fine motion fender of upper portion concrete after the initial set and until extracting completely.

The concrete that the first-stage groove joint of both sides was surpassed and is irritated is milled away in the grooving process of second-stage groove, because of the PVC pipe is vertical to lead to long arranging, and every section both ends all carry out limited shutoff, so the inside mud and a little grout of PVC pipe only can get into when concreting, consequently the mill wheel of groove milling machine also mills the PVC pipe garrulous simultaneously at the in-process that mills the concrete when grooving of second-stage groove, peel off the PVC pipe concrete face and form clean contact surface, form curved surface type recess in PVC pipe position, concrete can be inseparabler with the interlock of recess in the pouring process of second-stage groove, make its joint effect better, satisfy the construction requirements of underground continuous wall.

The invention has the advantages that:

in conclusion, the concrete joint has the advantages of scientific and reasonable structural design, good seepage-proofing effect, excellent practicability, contribution to construction of underground diaphragm walls and wide application prospect, and improves the concrete meshing force at the joint to ensure the joint quality and the construction safety.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. The embedded type sleeve milling joint method for the underground diaphragm wall is characterized by comprising a first-stage groove wall body which is formed by pouring, wherein a hollow interval between adjacent first-stage groove wall bodies is a second-stage groove which is formed by pouring concrete, a reinforcement cage for pouring concrete is arranged in the first-stage groove wall body, sealing ribs on two sides of the reinforcement cage are plain end ribs, a plurality of PVC pipes are arranged on the plain end ribs on two sides of the reinforcement cage, the PVC pipes are longitudinally arranged in a through manner, the PVC pipes are milled and crushed by a groove milling machine when the groove milling machine mills the concrete during groove forming, grooves are formed in the positions of the PVC pipes, and the concrete poured by the second-stage groove and the groove positions are tightly occluded.

2. The embedded type casing milling joint method for the underground diaphragm wall as claimed in claim 1, wherein the PVC pipe is fixed by iron wires and sealing ribs, and the spacing between the iron wires is 4-5 m.

3. The embedded type casing milling joint method for the underground diaphragm wall as claimed in claim 1, wherein plugs are arranged on two end faces of the PVC pipe.

4. The method for milling joints of an underground diaphragm wall as claimed in claim 1, wherein the shape of the groove is curved.

5. The underground continuous wall embedded type casing milling joint method as claimed in claim 3, wherein the plugging adopts dense PVC grids or perforated PVC covers.

6. The embedded type casing milling joint method for the underground continuous wall as claimed in claim 1, wherein the plurality of PVC pipes on the two sides of the primary trough wall are arranged side by side, and the sum of the diameters of the plurality of PVC pipes on the two sides of the primary trough wall is smaller than the thickness of the reinforcement cage.

7. The embedded type casing milling joint method for the underground continuous wall as claimed in claim 1, wherein each PVC pipe is formed by longitudinally and sequentially arranging a plurality of sections of pipes with the same specification.

8. The method for milling joints of an underground continuous wall in an embedded manner, according to claim 1, wherein the surface of the reinforcement cage is provided with a protective block.