The invention discloses a construction method of cutting an underground obstacle with a wire saw. The construction method comprises the following steps of a, determining a cutting point by referring to the position relationship between the underground obstacle and the construction interval according to a drawing; b, drilling on the two sides of the cutting point of the obstacle symmetrically with a drilling rig to form two drilling holes, and placing a circular tube into each drilling hole to protect the wall, wherein each circular tube is provided with a notch extending in the length direction, and the notches in the two circular tubes are arranged in opposite; c, assembling the wire saw; d, putting down a support component slowly, and starting a drive device until the obstacle is cut off. In the way, the construction method has the advantages of being safe and reliable, economical and reasonable and convenient in construction, the time limit for a project can be effectively reduced, and the impact exerted on the surrounding environment is small, so the construction method is resource-saving and environment-friendly.

Construction method of cutting underground obstacle with wire saw

The invention discloses a recyclable steel strand irregular support pile based on a pre-stress technique. The recyclable steel strand irregular support pile comprises a concrete pile body, wherein at least one pre-buried tube is arranged inside the concrete pile body; the pre-buried tube is U-shaped; a bottom bent part of the pre-buried tube is positioned at the bottom of the concrete pile body; two end parts of the pre-buried tube penetrate through the top of the concrete pile body; a U-shaped pre-stress steel strand is arranged inside the pre-buried tube in a matching manner. By adopting the mode, the recyclable steel strand irregular support pile is simple and reasonable in structure, after the main purposes of the pile body are completed, the prestress of a tension end is released, and the steel strand can be easily pulled out by a mechanical force, so that the purpose of recycling the steel strand is achieved.

Recyclable steel strand irregular support pile based on pre-stress technique

The invention provides a method for removing an underground obstacle. The method for removing the underground obstacle comprises the following steps that a working well is formed, the area where the obstacle needs to be cleared is positioned on the side wall of the working well; the area where the obstacle needs to be cleared is divided into a plurality of regions, working is carried out on the regions in a first direction form boreholes, fillers are injected into the boreholes, and an included angle exists between the first direction and the height direction of the working well; and the areaof the space surrounded by all the boreholes is cut to form a tunnel. According to the method for removing the underground obstacle, the area where the obstacle needs to be cleared is divided into a plurality of regions, in the obstacle removing process, the obstacle is removed in a partition mode, the construction area is not prone to collapsing, the danger of workers in work is reduced, holes are drilled in the horizontal direction under the ground, safety and reliability are achieved, environmental impact is small, high work efficiency is achieved, speediness and economy are achieved, energy is saved, and environmental protection is achieved.

Method for removing underground obstacle

The invention discloses a construction method of a permanent rigid waterproof layer. The method comprises the steps that firstly, the surface of a braced wall or cushion is subjected to waterproof andleveling treatment; then, a spraying machine is used for spraying plain mortar to the braced wall or cushion to form a first plain mortar layer of 2 to 5 mm, a second cement mortar layer of 4 to 8 mm, a third plain mortar layer of 2 to 5 mm, a fourth cement mortar layer of 4 to 8 mm and a fifth plain mortar layer of 2 to 5 mm, and a rigid waterproof layer is formed; a structure wall is constructed in the rigid waterproof layer of the braced wall, the braced wall and the structure wall are integrated, foundation bearing force and anti-buoyancy can be greatly improved, a certain constraint effect on foundation soil rebound, uplift and subsidence can be achieved, the rigid waterproof layer, the braced retaining wall and the structure wall in a foundation pit are made of the same material, have the same strength and durability and are easily bonded together, in foundation construction process, precipitation and pollution discharge are not needed, fertilizer groove backfill is not needed,the construction speed is high, the quality is good, the cost is low, and the method is ideal green construction.

Construction method of permanent rigid waterproof layer

The present invention discloses a support pile structure based on the prestressing technology. The support pile structure comprises a support pile body; the top of the support pile body is provided with a concrete connecting beam plate; the concrete connecting beam plate is fixed on the support pile body; an inner pile is disposed in the support pile body; the top of the inner pile passes through the support pile body and is connected with the concrete connecting beam plate via an anchoring bolt; the bottom of the inner pile is provided with a ribbed reinforced concrete filling pile; the top of the ribbed reinforced concrete filling pile extends to the inside of the inner pile; the ribbed reinforced concrete filling pile is connected with the inner pile via a rivet; the bottom of the ribbed reinforced concrete filling pile is fixed on an inner bottom surface of the support pile body; and one side surface of the inner pile is equipped with a prestressed steel strand. According to the support pile structure based on the prestressing technology, prestress at a tensioning end can be well released, the support action can be well achieved through mechanical force, the support pile structure has good structure performance and earth-retaining and water seal functions, the support pile height is increased, foundation pit safety is ensured, and displacement of the pile body and the soil body are decreased.

Support pile structure based on prestressing technology

The invention discloses a clearing construction method for an underground obstacle. The method comprises the following steps of a, looking up the position relation between an underground obstacle anchoring section and a construction interval according to a blueprint; b, grooving to the obstacle position at the upper part of the underground obstacle anchoring section by a grooving machine, grooving at least two grooves and forming at least two groove areas; c, cutting off the underground obstacle in part of the groove areas by a cutting machine, and separating the part, positioned in the construction interval, of the underground obstacle from the underground obstacle body; d, pulling the underground obstacle from the other groove areas by a mechanical device; e, backfilling the groove areas. By the mode, the clearing construction method has the advantages of safety, reliability, economy, reasonability and convenience in construction, the duration can be effectively saved, the influence to peripheral environment is small, and the clearing construction method belongs to a resource-saving and environment-friendly construction method.

Clearing construction method for underground obstacle

The utility model discloses an underground structure outer wall HCMW worker method coincide wall, include: the cement mixing method wall, the cement mixing method wall includes a plurality of cement mixing method of interlock each other in succession, interval or insert in succession and be equipped with the reinforced concrete precast pile in a plurality of cement mixing method, the screed -coatsets up on the inner wall of cement mixing method wall, the underground structure outer wall, the underground structure outer wall sets up on the inner wall of screed -coat, the underground structureouter wall includes the reinforcing bar and mixes the concrete that has waterproof compacting agent, it is a holistic atress component to constitute through connection structure between cement mixingmethod wall and the underground structure outer wall. In this way, the utility model has the advantages of simple and reasonable structure, the fertile groove of cancellation to avoid a series of drawbacks in fertile groove, waterproof performance strengthens, and it is whole that a revetment and underground structure wall even are an atress, gains in strength process simplification, constructionconvenience, reduction of erection time.

Underground structure outer wall HCMW worker method composite wall

The utility model discloses a recyclable steel strand special-shaped support pile based on the prestress technology. The recyclable steel strand special-shaped support pile based on the prestress technology comprises a concrete pile body, wherein at least one pre-buried pipe is arranged in the concrete pile body and is U-shaped, the bent position of the bottom of each pre-buried pipe is located at the bottom of the concrete pile body, the two ends of each pre-buried pipe penetrate out of the top of the concrete pile body, and U-shaped prestress steel stands are arranged in the pre-buried pipes in a matched mode. Through the method, the recyclable steel strand special-shaped support pile based on the prestress technology is simple and reasonable in structure, after the main purpose of the pile body is realized, the prestress at the tension end is released, the steel strands can be pulled out easily through mechanical force, and the purpose of recycling is realized.

Recyclable steel strand special-shaped support pile based on prestress technology

The utility model discloses a cast-in-place external prestressing concrete filled steel tube pile which comprises a steel tube, a concrete layer formed inside the steel tube through cast-in-place, and multiple prestressed tendons arranged on the steel tube in the axial direction of the steel tube, wherein each prestressed tendon comprises a top section, a middle section and a bottom section, the middle sections are located outside the steel tube, the top sections and the bottom sections penetrate through the wall of the steel tube to enter the steel tube, the upper end of the steel tube is open, and a sealing structure is arranged at the bottom end of the steel tube. The utility model further provides a support piling wall provided with the concrete pile. Due to the adoption of the external prestressing technology on the cast-in-place external prestressing concrete filled steel tube pile, a pile body can be restrained better, tensile resistance is improved, and deformation of the support piling wall during foundation pit digging is effectively prevented. Furthermore, field fabrication can be achieved, transformation cost can be saved, and on the premise that safety and reliability of foundation pit supporting are guaranteed, cost is reduced, construction period is shortened, and construction is convenient.

Cao Yaqiang

Papers

Clearing construction method for underground obstacle

Underground structure outer wall HCMW worker method composite wall

Recyclable steel strand irregular support pile based on pre-stress technique

Recyclable steel strand special-shaped support pile based on prestress technology

Cast-in-place external prestressing concrete filled steel tube pile and support piling wall