阅读说明：本技术 一种地连墙入微风化岩快速成槽施工方法 (Rapid grooving construction method for micro-weathering rock of diaphragm wall ) 是由 兰峰涛 田作华 王天武 李翰卿 陈汉 庞前凤 赵小兵 江龙 邹园林 高利平 李海 于 2020-05-21 设计创作，主要内容包括：本发明公开了一种地连墙入微风化岩快速成槽施工方法,包括以下步骤：(1)测量放线；(2)导墙施工；(3)泥浆的制备；(4)地下连续墙成槽施工：岩层以上土层采用液压式抓斗成槽；进入强风化及强度较低的微风化岩层后,采用双轮铣进行入岩钻进；当岩石强度较高时,采用冲击钻或旋挖钻引孔后,再采用双轮铣进行入岩钻进；500kv高压线下地连墙成槽采用冲击钻组织施工；(5)清底和刷壁；(6)成槽验收。本发明的成槽施工方法解决了硬岩斜岩成槽难,成槽垂直度、钢筋被铣、地连墙接缝和双轮铣在微风化花岗岩中作业效率低下等问题,提高了双轮铣工法的成槽速度,确保了地连墙的施工质量。(The invention discloses a rapid grooving construction method for a ground diaphragm wall micro-weathering rock, which comprises the following steps: (1) measuring and paying off; (2) constructing a guide wall; (3) preparing slurry; (4) grooving construction of the underground diaphragm wall: the soil layer above the rock stratum is grooved by adopting a hydraulic grab bucket; after entering a strongly weathered and slightly weathered rock stratum with lower strength, performing rock-entering drilling by adopting a double-wheel milling machine; when the rock strength is high, after a percussion drill or a rotary drilling drill is adopted for leading a hole, a double-wheel milling is adopted for carrying out rock-entering drilling; forming grooves on the underground diaphragm wall under the 500kv high-voltage line by adopting an impact drill for organization construction; (5) cleaning the bottom and brushing the wall; (6) and (5) checking and accepting the finished groove. The grooving construction method solves the problems of difficult grooving of the hard rock inclined rock, grooving verticality, milling of reinforcing steel bars, low operation efficiency of underground diaphragm wall joints and double-wheel milling in slightly weathered granite and the like, improves the grooving speed of the double-wheel milling construction method, and ensures the construction quality of the underground diaphragm wall.)

1. A rapid grooving construction method for a ground connecting wall slightly weathered rock is characterized by comprising the following steps:

(1) measuring and paying off;

(2) the construction of the guide wall comprises measurement lofting, groove excavation, formwork reinforcement binding, pouring, backfilling and maintenance;

(3) preparing slurry: preparing according to the ratio determined by the test, storing the slurry at the preparation point for more than 24 hours, using after the slurry is qualified through inspection, and recovering the slurry which is well jacked out during concrete pouring for recycling;

(4) grooving construction of the underground diaphragm wall: the soil layer above the rock stratum is grooved by adopting a hydraulic grab bucket; after entering a strongly weathered and slightly weathered rock stratum with lower strength, performing rock-entering drilling by adopting a double-wheel milling machine; when the rock strength is high, after a percussion drill or a rotary drilling drill is adopted for leading a hole, a double-wheel milling is adopted for carrying out rock-entering drilling; forming grooves on the underground diaphragm wall under the 500kv high-voltage line by adopting an impact drill for organization construction;

(5) cleaning the bottom and brushing the wall: after the groove section is dug to a designed height, checking the groove position, the groove depth, the groove width and the verticality, and cleaning the bottom and brushing the wall after the groove section is qualified;

(6) and (4) checking and accepting the finished groove: when the hole is finished, after the hole is inspected to be qualified, the site supervision engineer is reported to carry out comprehensive inspection and acceptance of hole positions, hole depths and hole shapes, and after the hole is qualified, a qualification certificate is issued, and the next procedure of construction is carried out.

2. The method for constructing the rapid grooving of the underground diaphragm wall into the slightly weathered rock according to the claim 1, wherein in the step (4), soil layers above a rock stratum are divided according to the grooving section, construction is performed in a framing mode, and grooving is performed by adopting a hydraulic grab three-grab grooving method.

3. The method for rapid grooving construction of the underground diaphragm wall into the slightly weathered rock according to the claim 1, wherein in the step (4), grooving construction of the strongly weathered rock stratum is as follows: the rock stratum is processed by adopting double-wheel milling to form grooves, the double-wheel milling adopts cutting teeth hidden in a cutting wheel to cut the rock and mix the rock with bentonite suspension, rock ballast can be cut into fragments of 70-80mm or smaller by utilizing the cutting teeth, and the fragment suspension is pumped out of the excavating grooves by utilizing a centrifugal pump close to the cutting wheel; the centrifugal pump continuously pumps out a mixture of soil and soil liquid and sends the mixture to the mud screening station, the mud treatment workshop comprises a sand remover and a gravel separator, the soil and impurities are separated from the mud, and the mud is fed into the pump to pump the regenerated mud back to the excavation tank to form a closed loop.

4. The method for rapid grooving construction of the underground diaphragm wall into the slightly weathered rock according to claim 1, wherein in the step (4), when the rock strength is high, a percussion drill and a rotary excavating drill are used for hole guiding construction, then a grooving machine is used for excavating an upper soil layer, then a double-wheel milling is used for rock surface grinding, the rock surface grinding is alternately used until a designed elevation is reached, and slurry is pumped and discharged in time.

5. The method for constructing the underground diaphragm wall into the micro weathered rock through the rapid grooving, according to the claim 1, is characterized in that in the step (5), the wall brushing is performed until the groove is formed to the preset depth, 200mm is reserved, the wall brushing is started, the joint part is dug by using grab bucket teeth, after the grooving of the second-stage groove section is finished, the wall brushing is performed on the joint part which is manufactured before the steel reinforcement cage is arranged, the wall brushing is performed for not less than 20 times, and the structure after the wall brushing is not subjected to mud clamping; and hanging a wall brushing device by using a trenching machine to brush the concrete wall of the joint of the groove section up and down so as to remove impurities at the joint.

6. The method for constructing the underground diaphragm wall into the micro weathered rock rapid groove according to the claim 1, characterized in that in the step (5), a method combining a precipitation method and a replacement method is adopted for bottom cleaning.

7. The method for rapidly grooving the underground diaphragm wall into the slightly weathered rock according to claim 6, wherein the bottom cleaning by the sedimentation method is started half an hour after the grooving is finished, and the bottom sediment is directly excavated by a hydraulic grab bucket for grooving operation.

8. The method for constructing the underground diaphragm wall into the micro weathered rock rapid groove is characterized in that the replacement method adopts a pump to pump and reversely circulate to replace the slurry, a slurry replacement pump is hung at a position 1m away from the groove bottom by a crane, the slurry replacement pump is started, the sediment at the groove bottom is sucked upwards, and the slurry is replenished at the groove opening; in the whole process of bottom cleaning and slurry replacement, the balance of slurry suction amount and slurry supplement amount is well controlled, and slurry cannot overflow out of the tank or the slurry surface falls to be 30 cm below the top surface of the guide wall.

Technical Field

The invention relates to the technical field of building construction, in particular to a rapid grooving construction method for a ground diaphragm wall micro-weathering rock.

Background

In recent years, due to urban traffic improvement, subways are rapidly developed at home and abroad, with the vigorous promotion of the construction of coastal urban rail traffic projects in China, construction and excavation of continuous walls in subways and urban buildings penetrate through different types of stratums from top to bottom, and how to ensure the construction safety, quality and construction speed under unfavorable geological conditions is worth of deeper discussion.

At present, the stability of the wall of the trench in China is researched more, and a certain achievement is achieved, for example, the effect of trenching the soft soil layer of the diaphragm wall is ensured by improving and controlling the control factors influencing the stability of the wall of the trench. At present, the research on the rapid rock stratum grooving construction process at home and abroad has no complete system, and the general underground diaphragm wall grooving mainly comprises an impact drilling method, a drilling and grabbing method, a grabbing method and a milling and selling method. But for special bottom layers, the problems of difficult grooving, construction speed and the like of rock stratums are solved.

Disclosure of Invention

The invention aims to solve the technical problem of providing a rapid grooving construction method for underground diaphragm wall slightly weathered rock, which meets the requirements of rapid, high-quality, comprehensive, economic and balanced production of the project.

The technical problem to be solved by the invention is realized by the following technical scheme:

a construction method for quickly grooving underground diaphragm wall micro-weathering rocks comprises the following steps:

(1) measuring and paying off;

(2) the construction of the guide wall comprises measurement lofting, groove excavation, formwork reinforcement binding, pouring, backfilling and maintenance;

(3) preparing slurry: preparing according to the ratio determined by the test, storing the slurry at the preparation point for more than 24 hours, using after the slurry is qualified through inspection, and recovering the slurry which is well jacked out during concrete pouring for recycling;

(4) grooving construction of the underground diaphragm wall: the soil layer above the rock stratum is grooved by adopting a hydraulic grab bucket; after entering a strongly weathered and slightly weathered rock stratum with lower strength, performing rock-entering drilling by adopting a double-wheel milling machine; when the rock strength is high, after a percussion drill or a rotary drilling drill is adopted for leading a hole, a double-wheel milling is adopted for carrying out rock-entering drilling; forming grooves on the underground diaphragm wall under the 500kv high-voltage line by adopting an impact drill for organization construction;

(5) cleaning the bottom and brushing the wall: after the groove section is dug to a designed height, checking the groove position, the groove depth, the groove width and the verticality, and cleaning the bottom and brushing the wall after the groove section is qualified;

(6) and (4) checking and accepting the finished groove: when the hole is finished, after the hole is inspected to be qualified, the site supervision engineer is reported to carry out comprehensive inspection and acceptance of hole positions, hole depths and hole shapes, and after the hole is qualified, a qualification certificate is issued, and the next procedure of construction is carried out.

Preferably, in the above technical scheme, in the step (4), the soil layer above the rock stratum is divided into grooves according to the groove sections, construction is performed in a framing manner, and the grooves are excavated by adopting a hydraulic grab three-grab grooving method.

Preferably, in the above technical solution, in the step (4), the strongly weathered rock formation is subjected to grooving: the rock stratum is processed by adopting double-wheel milling to form grooves, the double-wheel milling adopts cutting teeth hidden in a cutting wheel to cut the rock and mix the rock with bentonite suspension, rock ballast can be cut into fragments of 70-80mm or smaller by utilizing the cutting teeth, and the fragment suspension is pumped out of the excavating grooves by utilizing a centrifugal pump close to the cutting wheel; the centrifugal pump continuously pumps out a mixture of soil and soil liquid and sends the mixture to the mud screening station, the mud treatment workshop comprises a sand remover and a gravel separator, the soil and impurities are separated from the mud, and the mud is fed into the pump to pump the regenerated mud back to the excavation tank to form a closed loop.

Preferably, in the technical scheme, in the step (4), when the rock strength is high, the percussion drill and the rotary excavating drill are used for hole guiding construction, then the trenching machine is used for excavating the upper soil layer and then double-wheel milling is used for rock surface grinding, the rock surface grinding is carried out until the designed elevation is reached, and the slurry is pumped and discharged in time.

Preferably, in the above technical scheme, in the step (5), the wall brushing is performed when the groove is formed to the preset depth, the preset depth is 200mm, the wall brushing is started, the joint part is dug by using a grab bucket tooth, after the groove forming of the second-stage groove section is finished, the wall brushing is performed on the joint part which is previously made before the steel reinforcement cage is put, the wall brushing frequency is not less than 20 times, and the structure after the cleaning cannot clamp mud; and hanging a wall brushing device by using a trenching machine to brush the concrete wall of the joint of the groove section up and down so as to remove impurities at the joint.

Preferably, in the above technical solution, in the step (5), the precipitation method and the displacement method are combined for bottom cleaning.

Preferably, in the technical scheme, the sediment removal method begins half an hour after the completion of the grooving, and the sediment at the bottom of the groove is directly dug by using a hydraulic grab bucket for grooving operation.

Preferably, in the technical scheme, the slurry is changed by pumping reverse circulation in a replacement method, the slurry changing pump is hoisted to a position 1m away from the bottom of the tank by a crane, the slurry changing pump is started, sediment at the bottom of the tank is sucked upwards, and slurry is replenished at the notch; in the whole process of bottom cleaning and slurry replacement, the balance of slurry suction amount and slurry supplement amount is well controlled, and slurry cannot overflow out of the tank or the slurry surface falls to be 30 cm below the top surface of the guide wall.

The technical scheme of the invention has the following beneficial effects:

(1) through the research on grooving technology combination methods of different forms such as impact drilling, rotary drilling, hole leading and double-wheel milling, the rapid grooving construction process for the underground diaphragm walls of different hard rock strata is provided, the problems of difficult grooving of hard rock inclined rocks, grooving verticality, low operation efficiency of steel bars to be milled, underground diaphragm wall joints and double-wheel milling in slightly weathered granite and the like are effectively solved, the grooving speed of the double-wheel milling construction method is improved, and the construction quality of the underground diaphragm walls is ensured.

(2) The crawler crane is adopted to assist the double-wheel milling to adjust the verticality from the deviation correcting system, so that the problem of verticality control of the grooving of the underground diaphragm wall in the inclined hard rock is well solved, and the grooving quality is ensured.

Drawings

Fig. 1 is a flow chart of the grab trenching of the present invention.

FIG. 2 is a drawing of the construction process of the impact drill according to the present invention.

Detailed Description

The following detailed description of specific embodiments of the invention is provided to facilitate a further understanding of the invention.